Californians bask in solar energy Citation: Solar Home Built by Students (2009, September 22) retrieved 18 August 2019 from https://phys.org/news/2009-09-solar-home-built-students.html Explore further Curio House. Image from livecurio.us The solar home will be dismantled and reassembled on the National Mall in Washington, D.C., early next month, where it will be subjected to 10 days of judging. The student-designed home will be open to the public, and will be judged on factors such as attractiveness of the design, marketing viability, energy efficiency, and the amount of excess electricity the home generates.The budget for the New England team’s design for the 800 square foot one-story home came in at around $200,000, and they hope the sale price could be about the same figure, but for a reduced number of solar panels. The sale price would make the design far more marketable than the 2007 competition design by a German team, which would sell for $1.2 million. The Boston students worked for nearly two years on the project. They reduced costs by purchasing widely available products from building supply stores, and by using a simple, modular design that could be constructed easily. The most expensive items were the bank of 28 top range SunPower photovoltaic panels and five solar thermal panels to heat the home and supply hot water. Tufts student Matt Thoms, who served as project director for the Curio House engineering and photovoltaics, said the team wanted to build a house that could be available now, and not something that would not be available on the market for five to ten years. The students also wanted to design a house that would be suitable for city and urban living, and not just for people in rural areas living off the grid. With this in mind, the house is designed for a couple with a small child, and it includes screens for the front deck and back porch that would provide privacy. The house has technologies expected in today’s city homes, such as Ethernet, but it also has a small garden watered by captured storm water to encourage the occupants to grow some of their own food and live a more sustainable lifestyle. The photovoltaic panels supply 6.4 kW, which is more than a home of the same size would need if connected to the grid, but for the competition the home must run for 10 days off the grid. A number of jobs must be completed, such as a movie night featuring the home’s entertainment system, and washing 10 loads of laundry during the period. Batteries fed by the solar panels produce night time and cloudy day electricity supplies for the home.The Curio House is well insulated to reduce heating and cooling needs, and is fitted with energy-efficient appliances and lights. It also has outdoor blinds on the southern side that can be adjusted to allow sunlight in for warmth and light. As a result of these features the students expect the electricity use to be around one third that of a typical American home of the same size.The students focused on designing a home that is affordable enough for people to live in now, and they have already found a buyer, since the building will become the first home in a “green community” planned for Cape Cod. The design can also be adapted for larger homes or apartments.The Solar Decathlon is held every two years and is run by the U.S. Department of Energy.More information: www.livecurio.us/© 2009 PhysOrg.com (PhysOrg.com) — Students from the Boston Architectural College (BAC) and Tufts University have submitted a completely solar-powered home, the Curio House, as New England’s entry into the Solar Decathlon competition. The entry is one of 20 designs by teams of university students vying for this year’s award for the best solar home design. 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.
(Phys.org) — You may have had to think about the Internet as a place where your Web usage puts a pricetag on your head and you are treated with ads assuming you are a likely customer. Now you need to think about the Internet as a place where your Web usage may land you on the books as mentally imbalanced. Sriram Chellappan and Raghavendra Kotikalapudi are two researchers who suggest the way one uses the Internet says something about the user’s mental well-being. Chellappan is an assistant professor of computer science at Missouri University of Science and Technology and Kotikalapudi is a computer science graduate. © 2012 Phys.Org They studied results from 216 undergraduates at Missouri S&T. The participants had to fill out a version of the Center for Epidemiologic Studies Depression Scale questionnaire, used for measuring depression levels in the general population. The survey revealed that 30 percent of the participants met the criteria for depressive symptoms. This, said the authors, is in line with national estimates that 10 to 40 percent of college students at some point experience such symptoms. The school’s IT department gave researchers campus data on campus Internet usage data for the participants—information about traffic flow that the university customarily collects for troubleshooting network connections. The authors say that this is one of the study strengths. “Earlier studies have looked into the relationship between Internet usage and depression, but ours is thought to be the first to use actual Internet data, collected anonymously and unobtrusively, rather than student-completed surveys about Internet usage, which are less reliable.”The researchers applied that data for a statistical analysis of the depression scores and Internet usage data. They said they found that students who showed signs of depression tended to use the Internet differently from those who showed no symptoms of depression.Several telling signs of depression, according to the study, could be correlated to features of Internet usage, as “p2p packets, which indicate high levels of sharing files (like movies and music).” Another sign they claimed was a sign of depressive people was very high e-mail usage. They shared the view with some psychologists that frequent checking of e-mail may relate to high levels of anxiety, which they said correlates with depressive symptoms. The authors also called out high “flow duration entropy, ” which they said often occurs when there is frequent switching among Internet applications such as e-mail, chat rooms and games.Other characteristic features of “depressive” Internet behavior, according to the study, included increased amounts of video watching, gaming and chatting.The authors suggest practical applications of their research could be a software application for use on home computers and mobile devices. It would monitor Internet usage and alert the person when usage patterns may signal depression symptoms.They also suggested the app as a tool for parents to monitor mood-related Internet usage patterns of their children. A third suggestion is that the app be used at universities to notify counselors of students whose Internet usage patterns indicate depressive behavior. A paper describing the research, “Associating Depressive Symptoms in College Students with Internet Usage Using Real Internet Data,” has been accepted for publication in a forthcoming issue of IEEE Technology and Society Magazine.. Explore further Internet usage patterns may signify depression Partial map of the Internet based on the January 15, 2005 data found on opte.org. Each line is drawn between two nodes, representing two IP addresses. Image: Wikimedia Commons. Citation: Internet study links usage case with basket case (2012, June 18) retrieved 18 August 2019 from https://phys.org/news/2012-06-internet-links-usage-case-basket.html More information: web.mst.edu/~chellaps/papers/12_tech-soc_kcmwl.pdf 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 discover way to allow 80 percent of sound to pass through walls More information: Air transparent soundproof window, arXiv:1307.0301 [cond-mat.mtrl-sci] arxiv.org/abs/1307.0301AbstractA soundproof window or wall which is transparent to airflow is presented. The design is based on two wave theories of diffraction and acoustic metamaterials. It consists of a three-dimensional array of strong diffraction-type resonators with many holes centered at each individual resonator. The acoustic performance levels of two soundproof windows with air holes of $20mm$ and $50mm$ diameters were measured. Sound waves of 80dB in the frequency range of $400 – 5,000Hz$ were applied to the windows. It was observed that the sound level was reduced by about $30 – 35$dB in the above frequency range with the $20mm$ window and by about $20 – 35$dB in the frequency range of $700 – 2,200Hz$ with the $50mm$ window. It is an extraordinary acoustic anti-transmission. The geometric factors which produced the effective negative modulus were obtained.Found on 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. Explore further To prevent noise from passing from one place to another, engineers generally use types of material that are able to transfer sound in the air to another medium, which then weakens its force (attenuation). For that reason, it would seem impossible to create a medium that would allow sound carrying air to pass though, while muting the very sound its carrying. But that’s what the team in Korea has accomplished.The window, is not actually a window, instead it’s two parallel planes of clear plastic separated from one another by a mere 40 millimeters—similar to double paned glass. The chamber between the plastic planes has been designed in such a way as to ensure that sound that enters is counteracted by the pressure in the chamber—using a principle known as bulk modulus (a materials’ resistance to compression.) Each chamber is “roughly” 150 millimeters square—to create a larger window the chambers were arranged in an array. The double pane approach muted sound, but not nearly as much as most would like. To cause more muting the team placed cylinders made of clear plastic through the planes (which they call emitters and receivers)—each with a piece of flat clear plastic covering both ends. A hole was then drilled through the flat plastic pieces allowing sound carrying air to pass through. As it did so, the sound was diffracted into the chamber between the two planes. The reason a cylinder was used instead of just drilling a hole in the plane was for allowing a filter to be placed to prevent the air passing through from whistling. The result is a window, or venting system, that allows for air passage while muting sound. Testing of the window showed it able to reduce sound by 20 to 30 decibels.The researchers note that changing the size of the hole allows for muting different frequencies. This they say could lead to interesting scenarios, such as a venting system that would mute annoying noises while allowing desired noise (such as waves on a beach) through along with fresh air. (Phys.org) —A team of materials scientists in South Korea has created a type of window that mutes noise while simultaneously allowing air to move through. In their paper they’ve uploaded to the preprint server arXiv, the team describes their window and how it was constructed. Citation: Materials scientists devise window that mutes sound but allows air to pass through (2013, July 9) retrieved 18 August 2019 from https://phys.org/news/2013-07-materials-scientists-window-mutes-air.html Diagram and picture of the measurement of the 50mm window.Credit: arXiv:1307.0301 [cond-mat.mtrl-sci] Journal information: arXiv © 2013 Phys.org
Kolkata: The Met officials on Sunday warned of spells of thundershowers accompanied by strong winds in five West Bengal districts even as moderate rain lashed parts of Kolkata and adjoining suburbs since morning. According to the regional Meteorological Department, depression over the Bay of Bengal near the state’s coastline will maintain its intensity for the next 12 hours, causing a downpour in the Gangetic West Bengal over the next two days. Also Read – Rain batters Kolkata, cripples normal life”Heavy to very heavy rainfall (7-19 cm) is likely over the districts of North and South 24 Parganas, Hoogly, West Midnapore, and Jhargram on Sunday. Purulia, Bankura and West Midnapore districts are likely to receive heavy rains on Monday,” G.K. Das, Director of Area Cyclone Warning Centre of the Regional Meteorological Centre said in a release here. The sky above Kolkata and adjoining areas was overcast since morning, with mild rain witnessed at regular intervals. The department said that wind speeds up to 65 kmph will blow along and off the West Bengal and Odisha coastlines for the next 24 hours. “The sea condition will be rough to very rough along Odisha, Bengal and Bangladesh coastline for 48 hours. Fishermen are advised not to venture into the sea in these areas,” the officer added.
In an initiative to provide a platform that ensures a new beginning in the lives of those for whom marriage holds a different meaning, Narayan Seva Sansthan celebrated its annual event ‘Divyang Vivah Samaroh’ on Sunday. The Sansthan marked its 25th event this time with this noble cause. The Vihah Samaroh is organised twice every year at a very large scale and has been the hand behind over 1,000 successful ‘Divyang’ marriages. This year the event, which was held at Janmasthmi Park, Punjabi Bagh in the national Capital, included 101 couples from different religions and from different regions all for one common sacred occasion. The auspicious day was celebrated with full fanfare and witnessed wedding festivities all organised by Narayan Seva Sansthan. Also Read – ‘Playing Jojo was emotionally exhausting’The ‘Divyang Vivah Samaroh’ till date has been instrumental in arranging marriages of 1021 couples. To grace this special occasion and to bless the newlyweds, MH Dalmia (President-OCL India Ltd & Dalmia Manav Sewa Trust) was part of the ceremony along with Kailashji Manav (Founder Chairman of Narayan Seva Sansthan) and Prashant Agarwal (President- Narayan Seva Sansthan). To join the couples in holy matrimony, many religious saints were a part of the wedding- Sanjay Krishna Salil ji, Jaya Kishori ji, Prachi Devi ji, Sanjay Krishna ji Thakur, Chitralekha ji, Madhav ji Mukhia, Ramkrishna ji and Arvind ji Maharaj blessed the newly wedded couples. The wedding celebrations took place amidst a gathering of many other distinguished invitees who extended their support and love for the newly wedded couples.
Kolkata: The job fair organised by the Directorate of Employment under the state Labour department, has provided employment to 602 youths in the state. The appointment letters were handed over by state Labour minister Moloy Ghatak on Monday, at a programme held in Khudiram Anushilan Kendra.”We had roped in some leading companies for the job fair on September 4, where the job seekers came in direct interface with the employers. As many as 23 employers from sectors like transport, insurance, education etc. attended the job fair at this venue itself and interacted with the candidates. After conducting all interview formalities they have selected 602 candidates,” state Labour minister Moloy Ghatak said.Elaborating on the initiatives of the Employment Directorate for ensuring employment of youths in the state, Ghatak said his department has come up with 10 skill development centres for jute workers in various parts of the state.”We are providing training to youths on spinning and weaving of jute. A person who has passed the eighth standard is eligible for the training, which three months in duration. In the first month of basic training, the candidate gets a stipend of Rs 180 per day and in the second and third month, when they do practical training in jute mills, they get a stipend of Rs 250 per day. Following this training, they are employed by the jute mill itself,” the minister said. The employment is guaranteed as the jute mills have an agreement with the directorate in this regard.Amarnath Mallick, the secretary of the Labour department, said that the department will hold more such job fairs and will rope in IT, marketing and sales companies to participate.
Kolkata: An elderly woman was stabbed by a man who had come to her apartment in Kolkata’s posh Salt Lake area seeking monetary help, police said on Saturday. “Jayashree Chakraborty, 71, on Friday was alone at her apartment in Salt Lake’s Purbachal Housing Society when the man rang the doorbell and asked for money for medical treatment,” an official said. He said the woman turned around to give the money when he attacked her with a sharp object. She got injured due to the stabs while the man ran away with more money. “The woman is fine now. We are trying to collect the CCTV footage to track the culprit,” he added.
Ever wondered what causes your shoelaces to loosen even when you tie them as firmly as possible? It is because while running, the force of a foot striking the ground stretches and then relaxes the knot, a study has showed. As the knot loosens, a second force caused by the swinging leg acts on the ends of the laces, like an invisible hand, which rapidly leads to a failure of the knot in as few as two strides after inertia acts on the laces.The findings, published in the journal Proceedings of the Royal Society, may help understand things like DNA that fail under dynamic forces, the researchers said. Also Read – Add new books to your shelf”When you talk about knotted structures, if you can start to understand the shoelace, then you can apply it to other things, like DNA or microstructures, that fail under dynamic forces,” said Christopher Daily-Diamond, graduate student at the University of California-Berkeley.Using a slow-motion camera and a series of experiments, the researchers assessed a pair of running shoes that were laced-up and were on a treadmill. They found that shoelace knot failure happens in a matter of seconds, triggered by a complex interaction of forces, as when running, the foot strikes the ground at seven times the force of gravity. Also Read – Over 2 hours screen time daily will make your kids impulsiveIn addition, the study showed that some laces might be better than others for tying knots, but the fundamental mechanics causing them to fail is the same.”The interesting thing about this mechanism is that your laces can be fine for a really long time, and it’s not until you get one little bit of motion to cause loosening that starts this avalanche effect leading to knot failure,” said Christine Gregg, graduate student at the University of California-Berkeley.