NanoWorld Nature Inspired Micro Circuits

first_img 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. A team of chemical engineers, biologists, geneticists, and electronic engineers headed by Kenneth Sandhage at the Georgia Institute of Technology and colleagues has developed a new process for converting the finely detailed silica skeletons of diatoms into synthetic replicas constituted by materials like titanium dioxide, which could be used in electronic devices. Citation: NanoWorld: Nature Inspired Micro Circuits (2005, October 13) retrieved 18 August 2019 from Microscopic sea creatures provide foundation for gas sensors, other devicescenter_img Diatoms are single-celled algae that live in water and assemble a shell, or frustule, of silica by converting nutrients and light. They can adopt an astonising variety of shapes – from simple geometric structures like triangles and squares to extremely complex 3D constructs with thousands of individual pores. There are more than 100,000 different species of diatom that are known to exist in nature – some of them being only tens of nanometres in size. They have an astonishing ability to replicate.Kenneth says: “I was travelling by bus and my copassenger was a marine biologist. She was excited about the structures created by diatoms. Her enthsiasm was infectious. It prompted me to find ways and means to grow such organsim. It was later on that we thought of developing them for use as nanodevices.”He adapted the nature’s technique of diatom’s own ability to reproduce as a means to mass-produce intricate three-dimensional structures. “This part was easy, but the real work entailed coating the diatom shells with metallic substances”,” the alternative being to replace the diatoms”. The team used conventional techniques like photolithographic. When contacted, Kenneth stated that he and his collaborators have so far devised a handful of ways to convert the silica encasing diatoms into other materials, some of which could prove electronically useful. “We created the nano-structure of barium titanate by modifying silica with gaseous metal at very high temperature and thereafter coating.” Kenneth Sandhage is quite hopeful that in near future it might be feasible to fabricate diatom structures to order. This is possible by exploiting a growing understanding of their genetic properties. They could then be chemically converted into nano-components. Kenneth says that his team has developed a couple of uses for the new structures, including using materials that catalyze chemical reactions as the coating for diatoms. The potentials of diatoms are immense. The catalyst-coated diatoms can used to destroy pesticides. This is a technique that might one day be gainfully employed to protect the eco-system. It can prevent the leaching of obnoxious chemicals. There is also a possibility to use them in computer displays. Nature becomes the mentor for new developments.Dr. Bikram Lamba, an international management consultant, is Chairman & Managing Director of Tormacon Limited- a multi-disciplinary consultancy organization. He can be contacted at 905 848 4205. email:,>by Dr. Bikram Lamba; Copyright 2005 Explore furtherlast_img read more

AMD has shipped 5 million Fusion processors

first_img AMD nearly doubles profit, but still seeking CEO ( — Advanced Micro Devices, which you may know better by its initials AMD, has announced that it has shipped out roughly five million of its Fusion processors since their creation. The processors, which are used mainly in netbooks are beginning to take down Intel’s market domination, at least when it comes to the world of netbooks and tablets. You may wonder how different the AMD and Intel processors are? To be honest the AMD only, in most cases, performs only slightly better on processing benchmarks than Intel models. These differences however, have been enough to make some manufacturers switch, since those boosts can be the difference between being sold and sitting on the shelf. Of course, this may have something to do with decreased consumer interest in netbooks, according to analysts. This is partially because laptops have gotten smaller and lighter, while still offering significant processing power. It is also partially because of the rise of tablet PCs, such as Apple’s iPad, which also offer consumers and ultra-portable web experience.AMD is going strong in these markets; the company is reporting that the demand for their processors has exceeded their expectations, with the demand for those processors far outpacing the supply. When you consider that these processors were only introduced to the market in the fourth quarter of 2010, these are impressive rise in sales. Between 3.5 million and 4 million of those sales were made in the first quarter of 2011.Intel does not, as you may have guessed, agree with the analysts who predict the decline of netbooks. Sources in the company have said to journalists that they still believe that netbooks can be a viable part of the mobile marketplace. 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. © 2010 Explore further Citation: AMD has shipped 5 million Fusion processors (2011, June 2) retrieved 18 August 2019 from read more

Mine those asteroids Strathclyde team finds easy 12

first_img Explore further © 2013 Schematic representation of the four categories of motion near the L2 point (represented by the set of axes in the figure): periodic motion around L2 (i.e., halo orbit), hyperbolic invariant manifold structure (i.e., set of stable hyperbolic invariant manifold trajectories), transit trajectory and non-transit trajectory. Credit: arXiv:1304.5082 [math.DS] Ten thousandth near-Earth object unearthed in space Citation: Mine those asteroids: Strathclyde team finds easy 12 (2013, August 13) retrieved 18 August 2019 from “Asteroids and comets are of strategic importance for science in an effort to understand the formation, evolution and composition of the Solar System. Near-Earth Objects (NEOs) are of particular interest,” they said, “because of their accessibility from Earth, but also because of their speculated wealth of material resources.” While they are not the first team to talk about how NEO resources may be exploited, the authors are pointing out that, out of these NEOs, they can identify a family of EROs—Easily Retrievable Objects. These EROs can be transported from “heliocentric orbits into the Earth’s neighborhood at affordable costs.” The problem to transfer an asteroid to an Earth or Moon centered orbit can be decoupled into the initial phase of inserting the asteroid into a stable invariant manifold, they said, and then provide the maneuvers required to continue the transit into the Earth system.The Strathclyde team searched through a database of about 9,000 NEOs for candidates and they found 12 that could be retrieved by changing velocity by less than 500 meters per second. .The authors said that the approach they would use for retrieval may also serve as a robust search and ranking methodology for future retrieval candidates that can be automatically applied to the growing survey of NEOs. “The possibility of capturing a small NEO or a segment from a larger object would be of great scientific and technological interest in the coming decades,” they stated. “It is a logical stepping stone towards more ambitious scenarios of asteroid exploration and exploitation, and possibly the easiest feasible attempt for humans to modify the Solar System environment.”As MIT Technology Review pointed out in discussing their findings, “None of the 12 ERO asteroids are new to astronomers; in fact one of them became briefly famous when it was found to be temporarily orbiting the Earth until 2007. But until now nobody had realized just how easily these bodies could be captured.”The authors of the article stated that “The paper presents a list of 12 EROs, with a total of 25 trajectories to periodic orbits near L2 and 6 near L1 below a cost of 500 m/s, and the number of these objects is expected to grow considerably in the coming years.” More information: Easily Retrievable Objects among the NEO Population, arXiv:1304.5082 [math.DS] and comets are of strategic importance for science in an effort to understand the formation, evolution and composition of the Solar System. Near-Earth Objects (NEOs) are of particular interest because of their accessibility from Earth, but also because of their speculated wealth of material resources. The exploitation of these resources has long been discussed as a means to lower the cost of future space endeavours. In this paper, we consider the currently known NEO population and define a family of so-called Easily Retrievable Objects (EROs), objects that can be transported from accessible heliocentric orbits into the Earth’s neighbourhood at affordable costs. The asteroid retrieval transfers are sought from the continuum of low energy transfers enabled by the dynamics of invariant manifolds; specifically, the retrieval transfers target planar, vertical Lyapunov and halo orbit families associated with the collinear equilibrium points of the Sun-Earth Circular Restricted Three Body problem. The judicious use of these dynamical features provides the best opportunity to find extremely low energy Earth transfers for asteroid material. A catalogue of asteroid retrieval candidates is then presented. Despite the highly incomplete census of very small asteroids, the ERO catalogue can already be populated with 12 different objects retrievable with less than 500 m/s of {Delta}v. Moreover, the approach proposed represents a robust search and ranking methodology for future retrieval candidates that can be automatically applied to the growing survey of NEOs.via Arxiv Blog 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. ( —Researchers at the University of Strathclyde in Glasgow have identified twelve easily retrievable objects among the population of near earth objects (NEOs). In their paper published this month in Celestial Mechanics and Dynamical Astronomy, authors D. García Yárnoz, J. P. Sánchez, and C. R. McInnes discuss the 12 asteroids that could be easily mined for valuable resources using existing spacecraft technology. Their article, “Easily Retrievable Objects Among the NEO Population,” focuses on near earth objects, about which other researchers tend to discuss in terms of the threats these pose in destruction. Authors of this paper, however, are concerned about being able to harness the positive benefits if the objects can be successfully exploited.last_img read more

South Pacific Islanders may have used obsidian 3000 years ago to make

first_img 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. Anthropologists in conjunction with archaeologists have bemoaned the lack of evidence of tattooing in ancient peoples due to skin degeneration. To get around this problem, some have sought evidence in the form of the tools that might have been used, but this, too, has led to problems, as it is believed that many such tools were made of biodegradable material such as fish bone. In this new effort, the researchers tested the possibility of using obsidian as a tattoo tool by ancient people living in the South Pacific.Obsidian, the researchers suggest, would have been an obvious choice, due to its sharp, glass-like features. They focused their attention on the Solomon Islands as a possible site of early tattooing activities for several reasons—the region’s long history of tattooing; its importance there; easy access to obsidian (it is formed as lava from a volcano cools); and most importantly, obsidian artifacts that have been found there at a site called Nanggu and dated back approximately 3,000 years, suitable for creating tattoos—prior research had suggested obsidian tools were used to tan hides, but the researchers note that a lack of large animals on the islands would have meant there were no hides to tan. To test the possibility that the artifacts had been used to create tattoos, the researchers gathered obsidian samples from island sites, fashioned them into roughly the same shapes as the artifacts, then used them to create tattoos on pigskin. Afterwards, they compared microscopic views of the artifacts and those tools they had created and used.The researchers report that they were able to create tattoos in the pigskin and that the sample tools they created looked remarkably similar under the microscope to the artifacts—they had similar signs of use, such as chipping, rounding and blunting as well as thin scratches. In addition, the artifacts had traces of ochre, charcoal and blood on them. Thus, the researchers suggest their experiments offer strong evidence of obsidian tools being used by early islanders to create tattoos. Explore further (—A trio of researchers has found evidence of obsidian tools being crafted for use in creating tattoos approximately 3,000 years ago by South Pacific Islanders. In their paper published in the Journal of Archaeological Science: Reports, Nina Kononenko and Robin Torrence with the University of Sydney and Peter Sheppard with the University of Auckland, all in Australia, describe experiments they conducted using cut obsidian to create tattoos on pig skin. They reported what they found, and why they believe prehistoric people used a variety of techniques to create tattoos. Journal information: Journal of Archeological Science © 2016 Phys.orgcenter_img Volcanic artifacts imply ice-age mariners in prehistoric Greece Obsidian artifacts found at the site of Nanggu/Solomon Islands. Credit: Kononenko et al. Journal of Archeological Science, DOI: 10.1016/j.jasrep.2016.05.041 Citation: South Pacific Islanders may have used obsidian 3,000 years ago to make tattoos (2016, July 11) retrieved 18 August 2019 from More information: Nina Kononenko et al, Detecting early tattooing in the Pacific region through experimental usewear and residue analyses of obsidian tools, Journal of Archaeological Science: Reports (2016). DOI: 10.1016/j.jasrep.2016.05.041AbstractAlthough tattoos have been observed on mummies dated to over 5000 years old, the generally poor preservation of human remains makes it difficult to use this type of adornment to understand how inscriptions on the body have been used to define self and social ascriptions. A potential method for detecting tattooing is to identify the tools used to make the markings. To assist recognition of tattooing tools, an extensive set of experiments was conducted in which retouched obsidian flakes bearing various pigments were used to pierce pig skin. Diagnostic use wear and residues associated with tattooing were identified. To illustrate the value of these results, traces preserved on a highly recognizable class of obsidian retouched artefacts from the Nanggu site (SE-SZ-8) in the Solomon Islands were analysed. Results indicate that these tools were used to pierce skin and may therefore have been tattooing implements involved in social, ritual and/or medical practices.last_img read more

New Research From Psychological Science

first_imgRead about the latest research published in Psychological Science: Sexual Selection, Agonistic Signaling, and the Effect of Beards on Recognition of Men’s Anger DisplaysBelinda M. Craig, Nicole L. Nelson, and Barnaby J. W. Dixson Can beards enhance recognition of threatening expressions such as anger? This research suggests that bearded faces can indeed be more accurately and quickly perceived as angry than clean-shaven faces. Participants saw photos of the same men displaying expressions of anger or happiness when bearded and when clean-shaven and decided whether each face was “happy” or “angry.” Participants were faster and more accurate at recognizing anger on bearded than on clean-shaven faces. In another experiment, anger was replaced by sadness, a negative but nonthreatening emotion, and participants were slower and less accurate at recognizing sadness on bearded than on clean-shaven faces, which indicates that beards do not enhance recognition of negative emotions in general. Bearded faces were also rated as more masculine and aggressive but also more prosocial (i.e., positive, helpful, friendly) than clean-shaven faces, indicating that beards do not enhance recognition of anger because of a stereotype associating beards with aggressiveness and anger. Craig and colleagues also used a computer-based emotion classifier and found that it provided higher confidence ratings when classifying angry bearded faces than when classifying angry clean-shaven faces. Given these results, the authors suggest that beards facilitate the recognition of anger because they enhance the prominence of the jaw, which, along with the mouth, is important in recognizing anger. Thus, beards may influence perceivers’ behavior, and, for example, professionals who have to respond to threats (e.g., police officers) may be quicker to perceive bearded men as threatening and to act on that perception. When Does One Decide How Heavy an Object Feels While Picking It Up?Myrthe A. Plaisier, Irene A. Kuling, Eli Brenner, and Jeroen B. J. Smeets Is There a Positive Association Between Working Memory Capacity and Mind Wandering in a Low-Demand Breathing Task? A Preregistered Replication of a Study by Levinson, Smallwood, and Davidson (2012)Matt E. Meier Larger objects are usually perceived as heavier than smaller objects. Plaisier and colleagues examined the time at which visual information about an object influences people’s weight estimates while lifting it. In three experiments, participants lifted small and large objects by a handle and estimated the objects’ weight. During the task, participants wore goggles that allowed them to see the whole time, did not allow them to see, or allowed them to briefly see at different points of the task. The size of the object influenced participants’ weight estimates when they could see the object the whole time. Size also influenced the estimates when participants could see only before lifting the object and, to a lesser extent, after lifting the object. However, when participants could see only right after the object reached the maximum height to which they lifted it, the influence of size on the estimates was similar to when participants could see the whole time. Because the influence of the object size on the weight estimates decreased only when vision was provided more than 300 ms after liftoff, the authors suggest that it takes about 300 ms to reach a perceptual decision about a lifted object’s weight. This study thus provides an account of the time course of the use of prior knowledge (e.g., the expectation that larger objects are heavier) in making a perceptual decision (e.g., an object’s weight while being lifted). In a 2012 study, Levinson, Smallwood, and Davidson found that high working memory capacity (WMC) was correlated with a high likelihood of reporting mind wandering when individuals were probed throughout a task but not when they were asked to catch themselves mind wandering. To test this, Meier replicated Levinson et al.’s original study with a larger number of participants. In a breath-awareness task, participants were instructed to be aware of their in and out breathing movements and to count every time they exhaled. During this task, they either received prompts to report whether they were mind wandering (e.g., “Just now, where was your attention?”; 1 = completely on-task to 6 = completely off-task) or were instructed to report anytime they caught themselves off task. Contrary to the results of the original study, the present findings showed that participants who had scored higher in WMC measures reported less mind wandering when probed. Participants with higher WMC self-caught less mind wandering overall, but when the ratio of self-caught mind wandering to probe-caught mind wandering was calculated, higher WMC was associated with higher self-caught mind wandering. These results indicate that individuals with higher WMC may not necessarily report more mind wandering when probed during a task than individuals with lower WMC, but that when their minds wander, they may be more aware of it. Can a Good Life Be Unsatisfying? Within-Person Dynamics of Life Satisfaction and Psychological Well-Being in Late MidlifeHenry R. Cowan Is having a good life (i.e., psychological well-being) always accompanied by feeling life satisfaction (i.e., subjective well-being, happiness)? To explore how life satisfaction and well-being are related, Cowan analyzed self-reports of midwestern participants followed through their late midlife (about age 50) between 2008 and 2017. In 2008, participants’ personality traits (extraversion, neuroticism, conscientiousness, agreeableness, and openness) were assessed, and that and every following year, they self-rated their life satisfaction (e.g., “in most ways, my life is close to my ideal”) and psychological well-being, defined by autonomy, environmental mastery (e.g., “I am quite good at managing the main responsibilities of my daily life”), personal growth, positive relationships, purpose in life, and self-acceptance. Results indicated that participants’ average level of life satisfaction was similar to their average level of psychological well-being, and in years in which those average levels varied, they did so for both variables (e.g., a year with higher life satisfaction was also a year with higher well-being). Well-being and life satisfaction were more connected in participants who scored higher on neuroticism and were independent for participants with very low neuroticism. Other personality traits, such as extraversion, did not contribute to the association between life satisfaction and psychological well-being. These results suggest that interventions to improve well-being may need to take into account personality traits, such as neuroticism. last_img read more

Opening doorways to art

first_imgThe Capital will get a rare chance to peek into the mind of National Award winning sculptor K S Radhakrishnan. His solo exhibition titled In the Open will feature around 30 large scale outdoor sculptures over the last three decades.A first of its kind, this exhibition will showcase an exclusive pictorial documentation of Radhakrishnan’s site specific works installed in various government and private enterprises.Radhakrishnan’s bronze sculptures have catered to art enthusiasts, who not only have a keen eye for detail but value an artistee’s creativity. Radhakrishnan’s sculptures are mostly seen indoors in galleries and museums, but he has created many sculptures keeping open air as their real living space. According to the artiste, sculptures need breathing space and could breathe well only in an open air. Radhakrishnan further explains, ‘An open air sculpture could be public and private at the same time. My works, irrespective of their size, are always conceived as independent aesthetic entities that demand open air for their existence.’ Also Read – ‘Playing Jojo was emotionally exhausting’‘As a city, Delhi has not yet warmed up to the idea of open air sculptures, though we have few public sculptures around the capital. K S Radhakrishnan’s works are not decorative pieces.They are contemporary works of art with a strong sense of asthetic individuality expressed in the enduring medium of bronze. I am very keen to showcase this internationally recognised artiste’s sculptural narratives with all its mythical, folklore and contemporary vigour,’ said Anubhav Nath, curator of the show. The exhibition will also feature a book written by critic Johny ML focussing on Radhakrishnan’s open air sculptures.WHEN: 15 November onwardsWHERE: OJAS ARTlast_img read more

Krishna redux

first_imgFor any actor, it is not easy to cast off such an iconic role, and Bhardwaj’s case is no different. The fans of the original Mahabharata are now set for a theatrical treat as the actor marks his return as Krishna, this time on stage.The Films and Theatre Society, a prominent theatre group based in Delhi, has roped in Nitish to reprise the famous role and once again become Arjuna’s charioteer. The actor, who quit his successful career of a veterinarian to pursue his passion in acting, was just 23 years old when he was picked for the epic role and in no time, the young actor became more than a star. People would touch his feet wherever he would go. Many actually believed, this is how Lord Krishna would look if he comes to earth. Also Read – ‘Playing Jojo was emotionally exhausting’‘It is almost after 25 years that I will once again pick the flute and get on the stage,’ chuckles the actor, who has been associated with theatre ever since he was a child. ‘I am a bit nervous as I, at no cost, want to disappoint my fans who have for decades showered me with their love,’  says Nitish, who performed in six Hindi and Urdu plays during late 1980s. The play  will be staged in Delhi on 26 July at Kamani Auditorium followed by the Gurgaon show on 3 August . as part of The Films and Theatre Society’s pan-India tour of plays, called Swades, which will cover several states including Rajasthan, Himachal Pradesh and Punjab. Koushik says, ‘When I redesigned my original play Arjun Ka Beta as Chakravyuh, the character of Krishna came out really well. While narrating the script to my team, it suddenly struck me that there is no one else but Nitish who can add life to this role.’last_img read more

Delhi celebrates happy teeth

first_imgThe President of India, Pranab Mukherjee inaugurated the 102nd FDI Annual World Dental Congress 2014 hosted by The Indian Dental Association (IDA). The four- day event that started off on 11 September at the India Expo Centre and Mart, Greater Noida, was witnessed by more than 10,000 visitors and delegates from over 138 countries. The theme of this unique congress was ‘A Billion Smiles Welcome the World of Dentistry’.last_img

Room tariff of guest houses in Visva Bharati to go up from

first_imgKolkata: Come July 1 and the tourists at the guest houses under Visva Bharati University in Santiniketan will have to shell out more for lodging. The university has decided to increase the tariff of all six guest houses under its aegis, on the premises of the varsity campus.According to university sources, Purba Palli, Ratan Kuthi, Sail International, Sri Niketan and Rathindra Atithi Griha are the major ones among the six guest houses. The President, Prime Minister or foreign guests who visit the university, stay at Rathindra Atithi Griha, which is known for its state-of-the-art facilities. Also Read – Heavy rain hits traffic, flightsRatan Kuthi is one of the oldest guest houses, which was set up in 1923, according to the model of the architecture of the university itself.According to a source, the tariff of AC double bed room of Rathindra Atithi Griha will be raised from Rs 1,500 to Rs 2,000, while that of a suite will increase from Rs 2,000 to Rs 3,000. The rates for rooms at Ratan Kuthi will be increased from Rs 900 to Rs 1,400 for AC double bed rooms and from Rs 950 to Rs 1,100 for rooms at the annex building. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedThe rate for Sail Guest House will be hiked to Rs 1,000 from Rs 800 for double bed rooms and Rs 600 from Rs 500 for single bed rooms. Purba Palli Guest House’s tariff will also go up from Rs 850 to Rs 1,000 for double bed rooms and the rates for international dormitory will be raised from Rs 100 to Rs 150. According to rules, a person lodging at these guest houses has to be an employee of the varsity or of the state or central government.A spokesperson in the varsity said that hotels with the same facilities in Santiniketan have a much higher tariff in comparison to the guest houses.last_img read more

Trinamool holds rally in Bengals Purulia to counter Shahs meet

first_imgKolkata: In a bid to counter BJP President Amit Shah’s public meeting in West Bengal’s Purulia district, the ruling Trinamool Congress on Sunday held a rally in the same area and vowed to stop the “separatist forces and riotmongers” from entering the state. Ridiculing Shah’s claims of winning more than 22 Lok Sabha seats from Bengal in the 2019 general elections, Trinamool said that the party would end up losing both the Lok Sabha seats they currently have in the state and draw a blank in 2019. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killed “The person, a prime accused in many murder cases in Gujarat, is coming here to foment unrest and making tall claims. He has no idea about Bengal’s tradition, culture and prior situations. We want to clarify that there is no place for riotmongers in Bengal,” Urban Development Minister Firhad Hakim said at the meeting. “He is talking about 22 Lok Sabha seats. Forget 22, they will even lose in the Darjeeling and Asansol seats that they currently hold. The BJP will score a big zero in Bengal in the 2019 elections,” he claimed. Also Read – Naihati: 10 councillors return to TMC from BJP The Minister said people like Shah who comes from Delhi or Gujarat have no idea about how much the situation has changed for the good in the Maoist-infested Bengal districts during the Mamata Banerjee regime. “During the Left rule, these people did not have the guts to visit Jungle Mahal because at that time there was no democracy here. Many people were killed. The entire region was suffering from the dual attacks of the Maoists and Left Front-backed goons. Under Banerjee’s able leadership, we have brought peace,” Hakim said. Women Development and Social Welfare Minister Shashi Panja, who was present at the meeting, said the Trinamol Congress is the only party in Bengal that cares about the lives and traditions of the tribal communities here. “We love the tribal communities and have always respected their contribution to society. Trinamool Congress observed the ‘Hool festival’ yesterday and celebrated the Santhal rebellion and their bravery against the British rule in Bengal. Did the BJP President say a single thing about it? No, he did not,” Panja added. Amit Shah, who came on a two day trip to Bengal, met the villagers in Purulia as part of the party’s ‘Jan Sampark Abhiyan’ on June 28 and later held a public meeting on the outskirts of Purulia town where he vowed to uproot the Mamata Banerjee government from the state and claimed that his party would emerge as the largest political outfit here after the 2019 elections.last_img read more