New method to make gallium arsenide solar cells

first_img(PhysOrg.com) — A new “transfer-printing” method of making light-sensitive semiconductors could make solar cells, night-vision cameras, and a range of other devices much more efficient, and could transform the solar industry. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. More information: Jongseung Yoon, GaAs photovoltaics and optoelectronics using releasable multilayer epitaxial assemblies, Nature, Volume: 465, Pages: 329-333, Date published: 20 May 2010, DOI:doi:10.1038/nature09054 This is a flexible array of gallium arsenide solar cells. Gallium arsenide and other compound semiconductors are more efficient than the more commonly used silicon. Credit: John Rogers Citation: New method to make gallium arsenide solar cells (2010, May 20) retrieved 18 August 2019 from https://phys.org/news/2010-05-method-gallium-arsenide-solar-cells.html They have learned that if they press the stamp on the stack and lift it quickly it picks up only the top film. They then transfer the GaAs to the substrate by stamping it onto the surface and peeling the stamp back slowly. They could then build the devices such as photovoltaic cells, semiconductor field effect transistors and logic gates, and near-infrared imaging devices on the substrates. The method yields large quantities of high quality GaAs films, leaving the original wafer for reuse to grow more films.Using their technique, which is described in the journal Nature, the researchers succeeded in mass-producing tiny solar cells about 500 micrometers in diameter, and they also produced components for mobile phones and infrared-imaging devices.Rogers said GaAs has a great deal of potential in the future, and the team is now developing commercially viable solar cells that will be able to generate electricity for about $1 per watt. Image of a printed GaAs solar cell with a size ~10 x 10 mm2 on a glass substrate, with simple, metal grid contacts. Image copyright: Nature, DOI:doi:10.1038/nature09054center_img © 2010 PhysOrg.com Explore further A pile of gallium arsenide solar cells is manufactured in stacks and then peeled apart layer by layer. They can be integrated into a number of electronic devices. Credit: John Rogers IMEC unveils promising mechanically-stacked GaAs/Ge multijunction solar cell Scientists at the University of Illinois at Urbana-Champaign have developed a new and cheaper way of producing microchips of gallium arsenide (GaAs), a compound semiconductor that responds to light. Gallium arsenide is about twice as effective as silicon in converting incident solar radiation to light, with a theoretical conversion rate of up to 40 percent, and has for that reason been used in solar cells in space crafts. The problem with GaAs is its expense and the need for wafers to be grown in precisely controlled conditions. The wafers are sliced for use, but only the surfaces are used and the rest is essentially wasted. Now the Illinois research team, led by materials scientist John Rogers, has developed an alternative and potentially much more cost-effective technique involving growing stacks of layers of GaAs alternating with aluminum arsenide (AlAs). When the stack is complete, the scientists then chemically etch away the AlAs layers using hydrofluoric acid, leaving the films of GaAs, which they then peel off and stamp onto another substrate such as glass, silicon, or plastic using a silicon-based soft rubber stamp. Rogers and his colleagues have been working on perfecting the technique for around ten years. last_img read more

Read More →

Quantum effects lead to more powerful battery charging

first_img Journal information: Physical Review Letters Credit: CC0 Public Domain The researchers, Francesco Campaioli et al., have published a paper on the fast charging of nanoscale batteries in a recent issue of Physical Review Letters.Although a great deal of research has shown that quantum phenomena provide advantages in information processing applications, such as computing and secure communication, there have been very few demonstrations of quantum advantages in thermodynamics. In one recent study in this area, researchers showed that quantum entanglement can allow more work to be extracted from a nanoscale energy-storage device, or “quantum battery,” than would be possible without entanglement. In the new study, the researchers build on this result to show that quantum phenomena can also enhance the charging power of quantum batteries. They also found that the process does not necessarily require entanglement, although it does require operations that have the potential to generate entangled states.”Our work shows how entangling operations—that is, interactions between two or more bodies—are necessary to obtain a quantum advantage for the charging power of many-body batteries, whereas entanglement itself does not constitute a resource,” Campaioli, at Monash University in Australia, told Phys.org. “Additionally, we show that for locally coupled batteries the quantum advantage scales with the number of interacting batteries.”The quantum advantage is not without its limits, however, and the physicists derive the upper bound on how much faster a collection of batteries can be charged with the help of quantum phenomena. They show that for locally coupled batteries the quantum advantage grows with the number of interacting batteries. These bounds for the quantum advantage are based on quantum speed limits, which are used, for example, to estimate the maximum speed of quantum processes, such as calculations on a quantum computer. Here, the limit is for thermodynamic processes. Overall, the results may lead to methods of improving future nanoscale energy-charging processes, as well as to a better understanding of how quantum theory and thermodynamics are related.”Our result could be used to provide optimal charging for nanodevices that rely on batteries that consist of few quantum systems, such as charge qubits, ions or atoms,” Campaioli said. “Our plan for future research in this field is to provide a tight upper bound to the advantage that can be obtained by means of interactions between a finite number of bodies. Furthermore, we would like to obtain an experimental realization of the above-mentioned quantum advantage.” (Phys.org)—Physicists have theoretically shown that, when multiple nanoscale batteries are coupled together, they can be charged faster than if each battery was charged individually. The improvement arises from collective quantum phenomena and is rooted in the emerging field of quantum thermodynamics—the study of how quantum effects influence the traditional laws governing energy and work. Explore further © 2017 Phys.orgcenter_img For faster battery charging, try a quantum battery? More information: Francesco Campaioli et al. “Enhancing the Charging Power of Quantum Batteries.” Physical Review Letters. DOI: 10.1103/PhysRevLett.118.150601 This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Citation: Quantum effects lead to more powerful battery charging (2017, May 1) retrieved 18 August 2019 from https://phys.org/news/2017-05-quantum-effects-powerful-battery.htmllast_img read more

Read More →

Skin wound regeneration with bioactive glassgold nanoparticles ointment

first_img Gold nanoparticles (AuNPs) are similarly becoming important in medicine due to their chemical and physical properties of biocompatibility, surface modification, stability and optical properties. Despite their challenging early translation in tissue engineering approaches, a low concentration of AuNPs can stimulate cell proliferation during wound repair. Preceding studies by the same research team showed that bioactive glass with AuNPs could stimulate the proliferation of human keratinocyte cells (HaCaT), which constitute 95 percent to 97 percent of the epidermis on the skin surface. In the present study, Marza et al. investigated the potential of dermal tissue regeneration in vivo. By day 14, they observed that both BG and BG-AuNP-Vaseline ointments could stimulate complete skin regeneration in experimental rat models, substantiated with gold standard histopathological analyses.Marza et al. freshly prepared spherical AuNPs ranging from sizes of 15 nm to 30 nm, confirmed using transmission electron microscope (TEM) micrographs to embed within the glass matrix. Using X-ray powder diffraction (XRD) patterns of the glass samples, the scientists investigated the amorphous structures to identify the crystallization centers and the gold signature. The characterization studies for the composite samples also included Fourier transform infrared spectroscopy (FTIR), which provided spectra typical for a silicate network. To develop the glass composition ointment, the scientists dispersed the powder composite materials in Vaseline. They then used dynamic light scattering (DLS) to measure particle size distributions and corroborate the difference in sizes between the BG-Vaseline and BG-AuNP-Vaseline sample structures. After extensive materials characterization, the scientists conducted biofunctionalization studies in vitro with keratinocytes cell cultures to verify biocompatibility prior to conducting surgical procedures in a translational animal model. As before, Marza et al. investigated the proliferation of HaCaT cells on BG-AuNPs and obtained comparable results of good in vitro tolerance during keratinocytes proliferation on both materials (BG and BG-AuNPs). The outcomes substantiated the composites for use as ointments for in vivo investigations.To assess the healing potential of BG and BG-AuNPs in the Vaseline ointments, Mayer et al. formed composites of 6, 12 and 18 weight percent concentration. For comparison, the scientists used Vaseline as a positive control. In the rat models, the scientists carefully created four skin excision wounds by successfully replicating a previously published small-animal surgery protocol. They used a specific method on each rat when applying the ointment; (1) the upper left excision was kept as the control without ointment, (2) on the left lower excision, the scientists applied the BG-Vaseline ointment, (3) on the upper right excision, they applied Vaseline alone and (4) on the lower right excision, they applied the BG-AuNP-Vaseline ointment. The scientists used 30 rats in the study with 10 rats assigned to separate groups (6% BG-Vaseline and BG-AuNPs-Vaseline ointment; 12% BG/BG-AuNPs-Vaseline; 18% BG/BG-AuNPs-Vaseline). The working protocol was the same for each group. After ointment application, the scientists added sterile bandages to the wound sites on rats to prevent wound infection postoperatively and administered Tramadol subcutaneously as an analgesic. By day 13, the wounds were closed in all animals. After 14 days, they humanely euthanized the animals and conducted histological examinations to reveal mild inflammatory reactions and wound healing responses in the respective animal groups. In all groups, vascular proliferation was mild to moderate. Mayer et al. specifically observed largely complete healing with intact epidermis, dermis and skin appendages in the 18 percent BG-AuNPs-Vaseline group. They also observed a lack of vascular proliferation for this group, which they attributed to advanced healing and late vascular remodeling. In this way, Mayer et al. extensively characterized and established bioactive glass-gold nanoparticle based Vaseline ointments as promising materials for wound healing. The research team will conduct further studies to optimize the wound healing ointment for investigations in bench to bedside translation. © 2019 Science X Network The gold nanoparticles embedded in silicate bioactive glasses prepared by the sol-gel method. Image credit: Materials Science and Engineering: C, Credit: Biomedical Materials, doi: https://doi.org/10.1088/1748-605X/aafd7d Journal information: Nature Protocols Explore further More information: S M Mârza et al. Skin wound regeneration with bioactive glass-gold nanoparticles ointment, Biomedical Materials (2019). DOI: 10.1088/1748-605X/aafd7dK. Magyari et al. Novel bioactive glass-AuNP composites for biomedical applications, Materials Science and Engineering: C (2017). DOI: 10.1016/j.msec.2017.03.138 Xusheng Wang et al. The mouse excisional wound splinting model, including applications for stem cell transplantation, Nature Protocols (2013). DOI: 10.1038/nprot.2013.002 A.C. Jayalekshmi et al. Gold nanoparticle incorporated polymer/bioactive glass composite for controlled drug delivery application, Colloids and Surfaces B: Biointerfaces (2014). DOI: 10.1016/j.colsurfb.2014.12.021 Wound healing—aiming for perfect skin regeneration. Science. 1997 Apr 4;276(5309):75-81. Bioengineers, materials scientists and life scientists who study the intersection of materials and medicine have developed autografts, allografts and xenografts for partial and full wound healing. Limitations of these procedures can delay the healing of large areas of skin defects and is a significant clinical problem in healthcare, due to the potential risk of antigenicity and disease transmission. Tissue engineering strategies for skin regeneration is a practical approach involving the use of bioactive biomaterials for assisted angiogenesis and faster revascularization. In a recent study, Sorin Marza and co-workers at the interdisciplinary research institutes and faculties of physics, bio-nano-sciences, pharmacy and medicine, developed bioactive glass-gold nanoparticles (BG-AuNPs) to promote the growth of granulation tissue and induce wound healing. In the study, the scientists investigated the impact of BG-AuNP composites as a topical ointment for 14 days on skin wound healing using an experimental rat model. Marza et al. developed a sol-gel of BGs and BG-AuNP composites mixed with Vaseline at concentrations of 6,12 and 18 weight percent (wt%) to understand the repair response of the skin. The scientists observed granulomatous reactions during the process of healing in the wounds treated with the BG-Vaseline ointment. The results are now published in Biomedical Materials, IOP Publishing.Angiogenesis, or the formation of new blood vessels from existing vessels is an important process during skin regeneration. Bioactive glass is responsible for local cellular responses due to in vivo degradation, stimulating the release of growth factors such as VEGF (vascular endothelial growth factor) and bFGF (basic fibroblast growth factor) to cause an angiogenic effect. A variety of studies on tissue engineering have demonstrated the benefits of bioactive glass in wound healing, based on results in animal models in vivo. In its principle of action, scientists have reported that bioactive glass stimulated the process by controlling the inflammation response to enhance the paracrine effect between macrophages and repairing cells. center_img Citation: Skin wound regeneration with bioactive glass-gold nanoparticles ointment (2019, February 14) retrieved 18 August 2019 from https://phys.org/news/2019-02-skin-wound-regeneration-bioactive-glass-gold.html , Science Cells beneath the skin explain differences in healing This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Healing is a complex process in adult skin impairments, requiring collaborative biochemical processes for onsite repair. Diverse cell types (macrophages, leukocytes, mast cells) contribute to the associated phases of proliferation, migration, matrix synthesis and contraction, coupled with growth factors and matrix signals at the site of the wound. Understanding signal control and cellular activity at the site could help explain the process of adult skin repair beyond mere patching up and more as regeneration, to assess biomechanics and implement strategies for accelerated wound repair in regenerative medicine.last_img read more

Read More →

Researchers find a way to make Casimir effect attract or repulse depending

first_img More information: Rongkuo Zhao et al. Stable Casimir equilibria and quantum trapping, Science (2019). DOI: 10.1126/science.aax0916 A team of researchers from the University of California at Berkeley and Lawrence Berkeley National Laboratory has found a way to make the Casimir effect attract or repulse depending on the size of the gap between two objects. In their paper published in the journal Science, the group describes their technique and possible applications. The Casimir effect, first proposed by Hendrik Casimir back in 1948, is the phenomenon in which two tiny surfaces in close proximity experience a force that pulls them closer together. Quantum fluctuations inside and outside of the gap push against the plates, but because those pushing from the outside are stronger, they create an attractive force between the two plates. The Casimir effect is more than a curiosity, because it can create problems in nanotechnology applications.Just two years after Casimir first proposed the effect, others in the field began making predictions about ways to counter it—making it repulsive rather than attractive, for example, in the case of fluids and plates made of lower refractive metals. Then, in 2010, a team at MIT suggested that it should be possible to counter both attractive and repulsive effects to create a state of equilibrium between the two plates. In this new effort, the researchers report that they have done just that.The work involved coating a gold plate with Teflon and suspending a tiny gold flake in ethanol just above it. They explain that because the Teflon has a lower refractive index than ethanol, it makes the two materials repulsive. But the interaction between the gold flake and the gold plate was attractive, creating a counter force. By placing all the components at just the right distance apart, they were able to achieve equilibrium. The system also allows for switching between the equilibrium state and either an attractive or repulsive state by moving one or more of the materials.The researchers suggest their technique could be used in nanomechanical devices or even in computers, where it could be used to reduce stiction, which is one of the primary causes ofcomputer crashes. Explore further The force is with us, always? Tuning quantum vacuum forces from attractive to repulsive Stable Casimir equilibrium enabled by a low–refractive index coating layer. (A) By coating a thin layer of Teflon on a gold substrate, a stable Casimir equilibrium is formed so that a gold nanoplate can be trapped at an equilibrium position in ethanol. (B) Casimir interaction energy between the gold nanoplate and the Teflon-coated gold surface.The Casimir force given by the derivative of the Casimir energy with respect to the distance is repulsive at short distances and attractive at long distances. (C) Thickness and surface profile of the gold nanoplate along the dashed line in the inset AFM image of the gold plate. Credit: Science (2019). DOI: 10.1126/science.aax0916center_img Journal information: Science Citation: Researchers find a way to make Casimir effect attract or repulse depending on gap size (2019, June 10) retrieved 18 August 2019 from https://phys.org/news/2019-06-casimir-effect-repulse-gap-size.html © 2019 Science X Network This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Read More →

For Kids With Anxiety Parents Learn To Let Them Face Their Fears

first_imgThe program was part of a Yale University study that treated children’s anxiety by teaching their parents new ways of responding to it. The first time Jessica Calise can remember her 9-year-old son Joseph’s anxiety spiking was about a year ago, when he had to perform at a school concert. He said his stomach hurt and he might throw up. “We spent the whole performance in the bathroom,” she recalls. Jessica decided to enroll in an experimental program, one that was very different from other therapy for childhood anxiety that she knew about. It wasn’t Joseph who would be seeing a therapist every week — it would be her. “The parent’s own responses are a core and integral part of childhood anxiety,” says Eli Lebowitz, a psychologist at the Yale School of Medicine who developed the training. — After that, Joseph struggled whenever he had to do something alone, like showering or sleeping in his bedroom. He would beg his parents to sit outside the bathroom door or let him sleep in their bed. “It’s heartbreaking to see your child so upset and feel like he’s going to throw up because he’s nervous about something that, in my mind, is no big deal,” Jessica says. The parent training seems to work because it lets children confront their anxieties while parents provide love and support from afar, says Anne Marie Albano, a psychologist at Columbia University who did not work on the study. Read the whole story: NPRlast_img read more

Read More →

Foreign artists Indian shores

first_imgIt’s raining foreign artists in the city and Delhiites seem to be lapping it all up. At Visual Arts Gallery, seven British artists are showing in a group show titled Critical Narratives in Colour and form, and each one of them reiterates the importance of ‘creating’ art with one’s own hand. In one of the mixed media paintings that Angus Pryor has created, he fills his canvas with motifs of bindus, swastikas, animal and birds — images that he has absorbed in Delhi. Pryor is also the curator of this show which is part of a two day workshop-cum-seminar organised by art curator Dr Alka Pande. Also Read – ‘Playing Jojo was emotionally exhausting’‘I have been travelling to India for many years now and I found that there is a strong similarity in our practice of storytelling through art,’ says Pryor. The exhibition that boasts of other British artists like Mavernie Cunningham, Jez Giddings, William Henry, Mark Howland, Chris Hunt and Aya Mouri, hence, places a deliberate emphasis on painting and print making which was and continues to be an essential part of Indian art practice.In another group show titled Whose History, Which Stories — presented by Shrine Empire at The Stainless — curator Oindrilla Maity Surai has put together evocative videos, paintings and installations by five South Korean and five Indian artists. According to Surai, ‘The exhibition tries to find out the many similarities and idiosyncrasies that prevail in these two neighbouring countries. It is a platform where two neighbouring countries  come together through art.’ Also Read – Leslie doing new comedy special with NetflixFor instance, SangHwa Park’s videos from the Inner Dream series portray the pessimism of the 21st century. Science and technology have not associated themselves with well being alone. Desire continues to pervade society. War is also the subject for YoungTae Kim and ChangWon Lee’s photographs. They question the validity of war, the freedom fighter and their memories.The artist to watch out for, however, is Gim Gwang Cheol whose videos of his intensely charged performances question the human situation in a sprawling city that grows oblivious of its past, its sacrifices to earn a free nation state and what it actually promised to achieve. Gwang Cheol writes about his project: ‘That Hitler’s face is placed inside Marilyn’s mouth is itself illusion. It is an attempt to express rejection toward unconditional worship of any icon. Uncontrolled desire for power and fame violates life so I reveal these elements through my art.’ At Vadehra Art Gallery, a solo show titled Passageway by German artist Wolfgang Laib is on view. His works are studies of form, colour and material explore natural material such as beeswax, pollen, rice and stone. In Lado Sarai, Exhibit 320 is showing photographs by three Singaporean artists along with three Indians — Sumit Dayal, Ankit Goyal, Akshay Mahajan, Nguan, Carrie Lam and Sean Lee — who explore the theme of self and identity through a visual medium.last_img read more

Read More →

Dance up

first_imgGym work out  getting boring? Try Masala Bhangra! This latest fitness fad stems from India but got its current form in the west. Labelled as one of the top five workouts in the world, the Masala Bhangra Workout is derived from two Indian words: Masala and Bhangra. Anyone who has grown up listening to Punjabi music, particularly the beat of the dhol, will have their feet tapping with this Masala Bhangra workout. This workout is based on traditional Punjabi Bhangra. It is a complete cardiovascular workout that blends traditional Bhangra dance steps with the exhilaration of Bollywood moves. Also Read – ‘Playing Jojo was emotionally exhausting’‘The interesting thing that has come to forefront is, that Delhiities are lapping up this latest fitness trend. The major reason behind this interest is that majority of the Delhiities are Punjabi and love to live life to the fullest. Dancing is an integral part of Delhi culture, be it marriages, functions or normal get-togethers – dancing is a must!’ says SwatiChatterjee, Director of  RDX Gym and Spa. Masala Bhangra is not just any other program but is a certified fitness program supported by the fitness boards and devised by Sarina Jain. It has been the only Indian fitness workout, besides Yoga, that is internationally recognised and accepted by everyone. Right now 15 countries have adopted this fitness regime. It is heartening to see Japanese and Kuwaiti women dancing to the beats of Bhangra. The trainers are generally called Masala Bhangra Ambassadors, as they not only teach a dance fitnessworkout but also promote the Indian culture! Head over and try it out.last_img read more

Read More →

Implementation of detention system soon

first_imgKolkata: Union minister for Human Resource Development Prakash Javadekar expressed his optimism over the implementation of detention system from the 2019 academic session. “I am hopeful that the Bill regarding detention-no detention will be passed in Parliament in July and will be readied by the month of August. From March 2019 onwards, the states who are willing to introduce detention can do it in Class V and VIII,” Javadekar said at a press conference on Saturday. Also Read – Heavy rain hits traffic, flightsHe attributed the delay in the passing of the Bill to the Congress and said: “The last session was washed out because of the Congress, otherwise it could have been passed in the Budget session itself.” According to the minister, the Centre has allowed the states to exercise their discretion on whether they should allow detention or continue with no detention policy. “25 states including Bengal want detention. The others do not want, I respect their freedom,” he maintained. Responding to a poser on reducing the burden of bags for students, the minister said the NCERT syllabus which is so crammed will be soon reduced by half. “A student’s brain is not a data bank. It should be able to analyse, comprehend and communicate. We have received suggestions from 37,000 teachers class wise, subject wise and lesson wise. The process of framing a system of reducing the burden of the syllabus which will bring down the load of school bags is on. Some of it will be reduced in 2019 and some again in 2020,” he said. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedHe further added that the ministry is focusing on learning with fun to reduce the pressure of studies. “We will be giving a grant of Rs 20,000 to each government school across the country for libraries and Rs 5,000 to Rs 20,000 grant to every school for building up sports infrastructure,” Javadekar said. He maintained that the National Testing Agency will be soon getting a new chairman and it will start taking examinations like Joint Entrance Exam (JEE) and NEET right from the 2019 academic year.last_img read more

Read More →

Tata Steel workers march to save Scottish plants

first_imgTata Steel workers from two of the Indian steel giant’s Scottish plants set to be mothballed took out a march in an attempt to save them from closure. The workers, joined by councillors and Labour party members, are calling for action by the Scottish and UK governments to protect the steel industry and its jobs, days after Britain’s biggest steelmaker announced the lay-off under a restructuring deal. Up to 270 jobs could be lost under Tata Steel’s plans to mothball Dalzell and Clydebridge steel plants along with 900 posts at the firm’s facility in Scunthorpe. A total of 225 jobs are threatened at the Dalzell plate- rolling works in Motherwell, along with 45 posts at the Clydebridge plant in Cambuslang region of Scotland.  Also Read – Punjab & Sind Bank cuts MCLR by up to 20 basis pointsTata, along with a number of other steel companies operating in Europe, has blamed cheap Chinese imports and high energy costs for a collapse in steel prices. Community union representative Derek Fearon said: “We are trying to raise awareness of the campaign, and hopefully through this Tata will become a responsible seller.“The main aim of the taskforce, the priority of it, is for the two plants to remain open. The mood is upbeat, the guys are still positive that everything can be done for the two plants to be saved.”  The Scottish government has pledged to do everything possible to keep the plants operational, with its preferred option being to find a buyer.last_img read more

Read More →

Aggressive adults experience memory problems later in life

first_imgIf you want to stay sane and not become forgetful in later life, keep calm and relax. A new study has revealed that young adults who are hostile or cope badly with stress are more likely to experience memory and thinking problems decades later.The study found that people with the highest levels of hostile attitude and poor coping skill traits performed significantly worse on tests of thinking and memory skills 25 years later than people with the lowest levels of the traits. Also Read – ‘Playing Jojo was emotionally exhausting’“We may not think of our personality traits as having any bearing on how well we think or remember things, but we found that the effect of having a hostile attitude and poor coping skills on thinking ability was similar to the effect of more than a decade of aging,” said study author Lenore J. Launer from the American Academy of Neurology in the US. The study, paper published in the online issue of journal Neurology, included 3,126 participants with the average age of 25. Also Read – Leslie doing new comedy special with NetflixFor the analysis, participants were divided into four groups based on their level of hostility and effortful coping, and asked questions that measured their personalities and attitudes, and ability to cope with stress, memory and thinking abilities.Cognitive abilities were measured again when they were at an average age of 50.To measure hostility, the questions about personality assessed aggressive behaviour, a lack of trust for others and negative feelings associated with social relationships. Another question looked at effortful coping, which was defined as actively trying to reduce stress despite repeated barriers to success.  The results showed that when people were asked to recall a list of 15 words, people with the most hostility in young adulthood remembered 0.16 fewer words in mid-life than people with the least hostility. Those with the highest level of effortful coping remembered up to 0.30 fewer words than those with the lowest level of effortful coping.“The study is observational. It does not prove that hostile attitudes and poor coping skills cause memory and thinking impairment; it only shows the association,” Launer noted.last_img read more

Read More →

Token bus strike gets lukewarm response services unaffected

first_imgKolkata: Bus services remained unaffected with no response to the token strike called by an association of bus owners.It may be mentioned that the association has called for a token strike by urging bus owners not to ply their vehicles during non-office hours for three days from Monday in and around Kolkata demanding hike in fare with increase in diesel prices. But there was no response to the same and people have not faced any problem in availing private buses in anytime of the day. Also Read – Rain batters Kolkata, cripples normal lifeHowever, the state Transport department had kept 200 additional buses as stand-by to operate if necessary. With private bus services remaining normal, there was no need to operate the additional state-run buses. The association had proposed to operate buses from 8 am to 11 am in the morning and again from 3 pm to 7 pm in the evening so that office-goers do not face trouble in commuting. But private bus services remained normal throughout the day. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedIt may be mentioned that other associations of the private and mini-bus owners had opposed the move of going for the token strike. State Transport minister Suvendu Adhikari said in this connection: “The transport system was normal. No passengers were harassed. Around 200 buses were kept as stand-by. However, there was no need felt to operate the same.” The state Transport department was prepared to cancel permits of the buses if found not operating as per the time table. It was also not necessary as the officials of the state Transport department found that the private buses operated maintaining proper timings.last_img read more

Read More →

Mamata flays Purulia dist officials for failing to make a single Kisan

first_imgKolkata: West Bengal Chief Minister Mamata Banerjee Tuesday flayed district officials for failing to make a single ‘Kisan Mandi’ fully operational in the backward district. BJP had made a dent in Purulia in the May rural polls this year. “Tell me why not a single ‘Kisan Mandi’ has become fully operational in your district. What is the reason behind it ?” Banerjee asked an official in an administrative meeting in Purulia district. The official replied that it was taking time to make the ‘Kisan Mandis’ fully operational as all the farmers do not like to come to the place for locational reasons. Besides, there are infrastructural issues. Also Read – Rain batters Kolkata, cripples normal life To this Banerjee said Kisan Mandis should come up at a place which will be convenient for farmers, where they can bring the agricultural produces for sale and have facilities like cold storage. The chief minister also expressed dissatisafaction over distribution of Kishan credit card among the people in Purulia district and said banks should be more active to facilitate it. When informed that 66,000 Kisan credit cards remained to be distributed among the poor in Purulia, she urged the official of a PSU bank present at the meeting to speed up the process. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killed The district official present claimed that the cards had been dispatched from their end to banks. When told by the government official that 36,000 Kisan credit cards have only been distributed so far, Banerjee asked the district magistrate to involve the district cooperative bank in the process to fast track the same. Pointing out that a sizeable portion of farm land in Purulia is not favourable for cultivation of paddy crops, she said if such land cannot be used for alternative farming, the farmers, including tribals should be employed in 100 days’ work scheme. She expressed happiness that Purulia district had been occupying the number one position in respect of 100 days’ work project for successive four years in the past and called for more involvement of people in such project. The chief minister also asked for speeding up work for the road link to the proposed place of airport at Charra in Purulia district. “An airport is needed for better connectivity,” she said and called for setting up industrial park. Told that there was possibility of drought in Purulia this year, Banerjee called for chalking out an action plan to fight the situation. She suggested appointing a nodal officer to monitor the situation in drought-prone districts like Purulia and Bankura. Banerjee called for bringing the tribal communities more under the state-sponsored housing projects and asserted her government wanted that various social welfare schemes of the government reach a cross section of underprivileged people. But one family should not get the benefit of all the schemes even if it filled the criteria. “There should be distribution of social welfare and social security schemes like in a proper manner so that one single family does not get all the facilities like ‘Kanyashree’, ‘Shikshasree’, ‘Sabujsathi’ and ‘Awas Yojana’ projects, as it will deprive others. She asked the police officials present to keep tab on movement of ‘outsiders’ in the Ayodhya Hills area in Purulia district. “We have information that some outsiders are visiting the area. Please keep your surveillance strong,” she said. Banerjee also asked the officer in-charge of Raghunathpur police station in the district to ensure there were no extortion activities in the area where industrial units were coming up.last_img read more

Read More →

White wine not necessarily with white meat ditto for red

first_imgConvnetional wisdom has it that while wine is to be paired with white meat and red wine with red wine. Correct? “Not so,” asserts sommlier Prateek Arora.“Pair a pork cooked with sage with a white wine and you get a blast of tastes,” Arora said at a Wine and Dine outing at the Mehrauli swish Qla fine diner here on Wednesday.He then went a step further.“Contrary to conventional wisdom, Indian foods and wine can be a great marriage but certain tweaks are required to the food, the melange of spices makes this possible,” Arora, a Qla director, who plays the guitar to unwind and who was named sommlier of the year at the recent delWine Excellance Awards, explained.  Also Read – Add new books to your shelfBut to begin at the beginning.“Welcome to the chemistry lab,” Arora proclaimed as the guests moved into the vast bar after a rather unusual, but refreshing welcome drink – sparkling wine with passion fruit puree and dehydrated pine apple – served in the courtyard of the 100-cover eatery, equally divided between the inside and the outside.“To truly appreciate wine, you have to first unlearn what you know. You’ve gotta see if the wine talks to you. So, smell, agitate the wine and then slip slowly. Wine is all about awakening your senses,” he explained. Also Read – Over 2 hours screen time daily will make your kids impulsive“Wine is like a little baby trapped in a bottle. The moment the bottle opens, you are bringing out its best. Look at it, swirl it and see what it does to your nose. Taste it and it tells you what it is all about on your palette. It’ll create perception areas on your tongue,” Arora elaborated. It was then time for the first of the pairings, a delicate gougers light pastry made with three different types of cheese and chilli flakes. What the white wine did was to enhance the flavours of the cheese and sharpen the impact of the chilli flakes. Quite a combination! It was then time to move into the kitchen where Chef Priyam Chatterjee, who was born into a family where feasts and thriving on culinary traditions were a daily deal, deftly cooked up an appetiser using shimiji mushrooms, butter, grated cheese and a variety of herbs with a generous portion of white wine.It was then time for the sit-down part of the evening over a vegetrian white sauce risotto and (vegetarian/non-vegetarian red sauce pasta – served in tandem with a white an a red wine).That proved quite a moment as the red wine, which went down smoothly when sipped independently, tasted a mite sweet when combined with the two dishes – proof of wine creating “perception areas” on the tongue.“I’m absolutely passionate about wine,” said Arora, who explained that he uses his wine palate to deconstruct and construct drinks to do justice to each ingredient which, according to him, should shine through in what a guest gets in the glass. For him, each of the parts is as important as the whole. And this is what prompted him to lauch Wine Evening at Qla once a month.“We choose the dates with care to ensure they don’t clash with anything important. We want our guests to spend a quiet evening and not get hassled about being caught in traffic or any other eventuality,” Arora concluded.last_img read more

Read More →

Central forces conduct route march in the city

first_imgKolkata: Central forces conducted route march in various parts of the city on Monday as part of area domination and confidence building measure among the people ahead of the Lok Sabha polls. A contingent of central forces along with officials of Kolkata police conducted route march in various parts of north Kolkata. Ten companies of central paramilitary forces had arrived in the state since Friday and are conducting flag marches in different parts of Kolkata and elsewhere before the seven-phase polls in the state beginning on April 11. Also Read – Bose & Gandhi: More similar than apart, says Sugata Bose On Saturday during their route march the central forces personnel knocked at the doors of the people and assuring them not to be afraid of hooligans. The ruling Trinamool Congress Sunday said the central paramilitary personnel should not “terrorise” the people in the “name of making them feel safe and secure”. The BJP has alleged that TMC is afraid that due to presence of central forces their plans to rig the polls might fall flat.last_img read more

Read More →

Exhibition showcasing traditional textiles of Latin America

first_imgA unique display showcasing the various textiles and weaving techniques of countries belonging to the group of Latin America and the Caribbean (GRULAC), was inaugurated at ‘The National Handicrafts and Handlooms Museum’, in New Delhi, recently.The exhibition features traditional textiles made by, mostly, women in Latin America and the Caribbean region. A magnificent collection of over 70 pieces narrates the combined rich cultural heritage of these nations. Also Read – Add new books to your shelfInaugurated by Aashna Kanhai, Ambassador of Suriname, the display serves to highlight traditional attires. During her speech at the well-attended inauguration ceremony, Ambassador Kanhai acknowledged the combined efforts of GRULAC in conceptualising the joint exhibition of textiles, and specially thanked Melba Pría, Ambassador of Mexico for the opportunity to make this collaboration a reality. She also shared an explanation of the Koto, a traditional dress from the Afro-Surinamese women and delivered a brief history of the traditions of textile by the Mayan weavers who were not only part of an advanced civilization of Central and North America, but also had a good sense of fashion. Also Read – Over 2 hours screen time daily will make your kids impulsiveAmbassador Kanhai reiterated the fact that the textiles are not bound by geographies but by traditions, in that the Mayan women weavers could easily make one believe in the sense of similarity with weavers of India. She declared the exhibition open by stating, “The cultural dichotomy between the Latin American and Caribbean region and India will linger in your imagination at this exhibition”.Curated by Shruthi Issac, the exhibit will remain on display for the public until April 8, 2018.last_img read more

Read More →

Brisk walk staves off disability

first_imgJust one hour a week of brisk walking may stave off disability in older adults with arthritis pain, aching or stiffness in a knee, hip, ankle or foot, according to a study unveiled on Monday. “This is less than 10 minutes a day for people to maintain their independence. It’s very doable,” said Dorothy Dunlop, a professor at Northwestern University in the US. “This minimum threshold may motivate inactive older adults to begin their path towards a physically active lifestyle with the wide range of health benefits promoted by physical activity,” said Dunlop, lead author of the study published in the American Journal of Preventive Medicine. Also Read – Add new books to your shelfAbout two in five people with osteoarthritis – most of whom have it in their lower joints – develop disability limitations, researchers said. The study found an hour of weekly moderate-to-vigorous physical activity allowed older adults to maintain their ability to perform daily tasks like getting dressed or cross a street before a traffic light walk signal changed. The weekly hour of exercise reduced their risk of mobility disability by 85 per cent and their risk of activities of daily living disability by almost 45 per cent. Also Read – Over 2 hours screen time daily will make your kids impulsiveFour years after the start of the study, 24 per cent of adults who did not get the weekly hour of brisk physical activity were walking too slowly to safely cross the street, and 23 per cent reported problems performing their morning routine. The researchers analysed four years of data from more than 1,500 adults in the national Osteoarthritis Initiative from Baltimore, Pittsburgh, Columbus and Pawtucket, Rhode Island. All the adults had pain, aching or stiffness in lower extremity joints from osteoarthritis but were free of disability when they began the study. Their physical activity was monitored using accelerometers. “Our goal was to see what kind of activity would help people remain free of disability,” Dunlop said. Guidelines in the US recommend older adults with arthritis should participate in low-impact activity. For substantial health benefits including reducing the risk for heart disease and many other chronic diseases, these guidelines recommend older adults participate in at least 2.5 hours a week of moderate-intensity activity. However, that level of activity can be daunting for inactive older adults with lower extremity pain, Dunlop said. “We hope this new public health finding will motivate an intermediate physical activity goal. One hour a week is a stepping stone for people who are currently inactive. People can start to work towards that,” Dunlop said.last_img read more

Read More →

Statuette Kept in a Margarine Tub for Years Turns out to be

first_imgFor over a decade, a farmer in the U.K. has kept a statue of Minerva, the Roman goddess of wisdom and war, without realizing he had in his possession an authentic artifact that is two millennia old. The silvery-eyed statuette of the goddess remained stored in a ‘Flora’ margarine tub for more than 10 years.The finder stumbled upon the artifact while out with his metal detector in the fields close to the village Hailey in Oxfordshire, England. As the Guardian reports, at the time he dismissed the statuette as being just “a modern copy” and “nothing more than a curiosity.”Mosaic of the Minerva of Peace in the Library of Congress.The man then packed the Minerva away in a margarine tub, consigning it to oblivion. Fast forward to 2018: a retired truck driver by the name of Len Jackman approached the Oxfordshire man asking to search his property for treasures with his own metal detector. He learned about the forgotten statuette and insisted on taking a look.“I thought it looked important and old,” Jackman said, according to the Guardian, and he was right. After the statuette was presented to the local finds liaison office, along with several other objects, its rarity and Roman provenance were confirmed.Statue of Minerva on the Alte Brücke in Heidelberg. Photo by BishkekRocks CC BY-SA 3.0“The objects had been left for me on my desk and I picked up the tub and assumed it might be a piece of lead it was so heavy. I unwrapped the tissue paper and it was just ‘wow’… a fantastic moment,” recalled Anni Byard, the finds liaison officer for Oxfordshire, in a tweet. It was the most extraordinary artifact Byard had seen in years in her office.The Minerva statuette from the margarine tub. Photo by Rod Trevaskus on behalf of Oxfordshire County CouncilThe announcement of the find was shared on December 11th by the British Museum as one of 1,267 treasure finds discovered in England, Wales and Northern Ireland, mostly by members of the public using metal detectors.Such a number of finds is “more than there has ever been since the Treasure Act was passed in 1996,” the Guardian wrote. “From prehistoric metalwork to a 17th century pocket watch — but the goddess with the silver eyes was particularly striking.”Raised-relief image of Minerva on a Roman gilt silver bowl, 1st century BC.The Treasure Act allows individuals to claim a reward after presenting their finds, which, as identified by the Act, need to be older than three centuries and consist of gold or silver. The value of any item consigned is then determined by a special commission.The Minerva statuette is made of copper-alloy and lead. Its head is detached from the body, and it was dated to the 1st or 2nd century AD when it most likely adorned the premises of a Roman temple.Minerva, the Roman equivalent of the Greek goddess Athena, was important for the ancient Romans. Her father Jupiter gave birth to her from his head, similarly to how Athena was born from the head of Zeus.The replica statue of Athena. Photo by Bubba73 (Jud McCranie) CC BY-SA 4.0It took some time until the figure of Minerva established itself among the most important Roman deities. She became a very popular goddess after becoming associated with the Quinquatrus festival, which the ancient Romans dedicated to its army and observed annually between March 19th and 23th. Before Minerva, this observation was under another Roman deity of war — Mars.Minerva also signified victory, and for Emperor Domitian, remembered today for the terrors he stirred to his members of Senate, the goddess was even more special. Domitian considered Minerva his most distinguished protector. Subsequently, he ordered the building of a temple dedicated to her in the Nerva Forum in Rome, during the late 1st century AD.The Minerva statuette that emerged out of the margarine tub is perhaps the most remarkable artifact related to this Roman goddess that has resurfaced in a while.Read another story from us: Untouched and Unlooted 4,400-yr-old Tomb of Egyptian High Priest DiscoveredHowever, if there is but one most impressive representation of her in art, it nowadays is kept in the Capitoline Museum in Rome. In full glory, holding a shield with the one arm and sporting a helmet on her head, Minerva’s statue there tops 9.8 feet tall.last_img read more

Read More →

University Discovered 1648 Bond that Still Pays Interest – And they Collected

first_imgExperts at Yale University discovered a Dutch water bond from 1648 that amazingly still pays interest. At some point or another, people usually hear about some of the outrageous bond agreements to which persons have been subjected over the years. That said, hearing about a bond which was originally issued in the 17th century yet is still accruing interest 300 years later doesn’t happen often: in fact, some might argue that it’s impossible. Well, that’s not quite the case – it would seem that there isn’t just one, but a few bonds issued in the 1600s which have stood the test of time and are still very much relevant to the respective payers’ pockets. YaleNews revealed that a water bond dating as far back as 1648 still contractually binds the obligated parties to pay annual interest today. Upon its discovery and subsequent analysis of its terms and agreements, reports indicate that at the time of its execution, the bond operated as a perpetual bond.The original clauses of the agreement bound the payer to “5 percent interest in perpetuity,” a rate which was later lowered to 3.5 percent and then 2.5 percent respectively in the 1600s. At the time, physical notations of interest payments were inscribed on the bond as they were made as a means of recording them. Being of Dutch-origin and made out of goatskin, when the bond was issued, it was apparently made out to Mr. Niclaes de Meijer, a man who was ordered to pay the “sum of 1000 Carolus Guilders of 20 Stuivers a piece.”This bond was issued in 1648 by a Dutch water board to finance improvements to a local dike system. A perpetual bond, it continues to pay interest. Photo courtesy of Yale News.The manuscript was filed at Yale’s Beinecke Rare Book & Manuscript Library in 2003 after Yale managed to come into possession of it. After Timothy Young, the curator of Modern Books and Manuscripts at the library, conferred with a Dutch water authority named Stichtse Rijnlanden, not only did he discover that this bond was only one of five ever found, all five of them were administered by the Hoogheemraadschap Lekdijk Bovendams.Beinecke rare book library at Yale. Photo by Michael Kastelic CC by SA-4.0This entity was actually a water board which comprised a combination of highly-esteemed citizens and landowners. Apart from collecting the interest payments, the board oversaw a number of man-made constructions, including canals and dikes. Based on YaleNews’ report, the money collected served to compensate workers who had just completed a project in which they had to construct a formation of piers located close to a bend in one of the rivers. The project was supposed to help prevent erosion by assisting the river in properly regulating its flow.Yesterday during my visit @NYSE John Tuttle presented copies of a 17th century perpetual bond, which still pays $30 a year! #dutch #history #nyse #wallstreet pic.twitter.com/mo7sHrPvV5— Dolph Hogewoning (@NLinNY) September 30, 2017In 2015, when Timothy Young returned from meeting with the relevant Dutch authority, he also brought back with him 12 years of back interest which was owed on the bond, a total which amounted to approximately 136.20 euros. Prior to 2015, the last time that the bond payments were collected was in 2003 when Yale first acquired it. At that time, as the reports states, “Geert Rouwenhorst, professor of corporate finance and deputy director of the International Center for Finance, took the bond back to the Netherlands to collect 26 years of back interest.”Related Video: The modern day revival of the Knights TemplarRouwenhorst was quite surprised that such a bond hadn’t been deemed null and void yet, going on to say “Yale’s bond is an extremely early example of a security that was issued without maturity and still pays interest. One ought to be astounded that such a thing exists.”That said, when the bond initially came into Yale’s possession, the Beinecke Rare Book & Manuscript Library did experience some difficulty in categorizing it considering that the bond was still very much valid.According to Young, in order for the bond to remain valid, “we need to take it to the issuing authority in the Netherlands every couple of decades to collect the interest, but unless we’re loaning an item to another institution, we don’t allow collection material to leave the library.” For this reason, authorities were a bit divided as to how to best proceed with the filing of the document.Related Article: The World’s Oldest Housing Complex Where Rent Hasn’t Gone Up For 500 YearsHowever, later on, something happened which enabled the relevant parties to come to an agreement. In 1944, the vellum no longer had any more space where the new interest payments could have been recorded. As a result, authorities elected to add a paper addendum which served to record future payments, a paper which they allowed to be sent to the Netherlands in order to retrieve and record the necessary payments.At present, the bond is considered a bearer bond as anyone who shows the attached addendum to the authority in charge of issuing the payment is allowed to accept it.last_img read more

Read More →

Colin was wrong on the Cowboys Theyre a legitimate Super Bowl contender

first_imgColin is entering the 2-step Dallas Cowboys recovery program. The first step is admitting that he was wrong on the Cowboys. These aren’t the old self-sabotaging Dallas Cowboys. When no one was paying attention, the Cowboys organization transformed from a dysfunctional mess, to a well-run organization, built on a punishing offensive line and consistent, dependable play. The second step is joining the bandwagon. Colin is all-in on Dallas as a Super Bowl contender.“This is a new Cowboy team, they’re grown up, they’re adult, they’re respectable, they reliable.”It’s Presidential election eve, and Colin is getting political. He’s officially coming out against the fade pattern with Proposition F. Vote no on the fade pattern. NFL teams won’t stop using it and it’s driving Colin nuts.Derek Carr led the Raiders to a win over division rival Denver, and is being talked about nationally as an MVP candidate. Colin has been on this for weeks, and can’t stop praising, not only Carr’s skills, but his off the charts intangibles.“He’s the next great NFL quarterback. And it’s not arm, and it’s not feet.”The Steelers finished up their loss to the Ravens with a botched, trick onside kick. Colin thinks it speaks to the larger problem that the Steelers aren’t buttoned up as an organization. It starts with Mike Tomlin. Well coached teams are consistent. The Steelers, with Big Ben, should at least be making the playoffs every year. Something isn’t right.The story of the year in college football is Penn State. They’re going to finish 10-2 and have a chance to be back among the top programs in the conference. What happened with Jerry Sandusky is sickening, but at this point, holding a grudge only punishes kids and coaches that have nothing to do with it. Colin is in favor of healing and moving forward.“I root for healing. As I’ve said many times, holding a grudge is chain-smoking hate. “Guests:Peter King – Founder and Editor-in-Chief of the MMQB joins the show to discuss whether Tony room can see the hand writing on the wall in Dallas, if there is a front office talent drain in Green Bay, the issues with the Steelers, why Matt Stafford is his midseason MVP, and why he thinks there’s a good chance the NFC Championship Game is played in Dallas.Cris Carter – NFL Hall of Fame wide receiver is in-studio to discuss Colin’s “Proposition F” against the fade pattern in the NFL, why teams struggle to execute it, why people need to pump the breaks on Ezekiel Elliott/Emmitt Smith comparisons, and why Dez Bryant isn’t a great route runner.Michael Lombardi – Former NFL Executive, and Fox Sports NFL Insider is in-studio reacting to NFL Week 9, including: why it’s time for a reality check that Green Bay’s roster just isn’t that good, his opinion on the fade route. And, why he agrees with Colin that embracing this Penn State team is good for football, and the right thing to do.Ian Rapoport – NFL Network Insider is in-studio to discuss the latest NFL league buzz joins the show including, why the Rams refuse to play Goff, if Mike McCarthy is on the hot seat in Green Bay, and which other coaches might be coaching for their jobs, and the latest on the Cowboys quarterback situation, and how the Raiders will approach the Derek Carr contract negotiations.last_img read more

Read More →

Upset Alert Fort Wayne takes down 3 Indiana in college basketballs first

first_imgThe first major upset of the college basketball season went down last night at Allen County War Memorial Coliseum in Fort Wayne, Indiana. The Indiana-Purdue Fort Wayne Mastodons took down the #3 ranked Indiana Hoosiers, 71-68 in overtime, in a college sequel to Hoosiers. The game was technically a home game for the Mastodons, but the crowd was mostly filled with Hoosier fans who made the trip to cheer for the in-state favorite.Indiana trailed for most of the game, but forced overtime by closing the second half on a 13-3 run.In the overtime period, the Mastodons were too much for the Hoosiers. Fort Wayne guard John Konchar’s steal of an Indiana in-bounds pass iced the game and the upset. Konchar finished the game with 15 points, 11 rebounds and 5 assists. Let the court stormin’ begin.El upset de Fort Wayne frente a Indiana es puro college basketball. pic.twitter.com/lkldaU7VhW— Nacho Juan (@NachoJuanRules) November 23, 2016One kid who ran onto the court was so psyched about the win, he decided to drink fake bleach. At least we hope it was fake.Fort Wayne knocked off No. 3 Indiana in OT, and one fan celebrated by casually downing bleach. https://t.co/Ka7xL9fbk1 pic.twitter.com/RmR9aGFZiS— CBS Sports CBB (@CBSSportsCBB) November 23, 2016 Advertisementcenter_img Congrats to Fort Wayne on the march madness-esque upset. At least there was something to do in the big city last night.last_img read more

Read More →