One overarching problem is that current semiconducting materials with the potential for use in renewable energy devices lack one key characteristic. When electrons in these materials are excited by light and jump to higher energy levels (leaving vacancies, known as “holes,” in the lower levels), both the electrons and the holes typically move around in the same region. Thus, they tend to recombine. This is desirable for certain applications, such as light-emitting devices, where electron-hole recombination produces light, but is not ideal for renewable energy devices. A better scenario is the separation of the excited electrons from the holes such that, in the case of solar cells, for example, the electrons can be drawn off and used for electricity.“Our nanowires were designed to provide this feature, along with a superior electrical conductivity,” said NREL materials scientist Yong Zhang, the study’s corresponding researcher, to PhysOrg.com. “Both of these properties are critical in order for renewable energy devices to reach their ultimate efficiency limits.”Conventional coaxial cables consist of a central copper wire symmetrically surrounded by a braided copper conductor, with an insulating spacer material between the two. The braid serves as a return route for electrons that have already passed down the core wire; it can equally be viewed as a channel for holes moving in the opposite direction. The insulator separates the charge passing through the wire and braid.Mimicking this structure, the group designed a nanoscale version consisting of a central wire, the “core,” surrounded by a shell (the shell is not cylindrical like conventional cables, but rather is hexagonal). The researchers used two semiconducting materials: gallium nitride (GaN) and gallium phosphide (GaP). They made two samples, one with a GaN core and GaP shell, and another with a GaP core and GaN shell. Both wires are approximately four nanometers in diameter (according to Zhang, this particular size was chosen by considering the computational effort needed to analyze the wires’ properties, because larger wires, while easier to make, require considerably more computing power and time to model. Similar success, he says, could be achieved with nanowires up to 10-15 nanometers in diameter). In neither sample is an insulating spacer required. This phenomenon is the result of the specific semiconducting behaviors of GaN and GaP. Scientists have designed a new type of nanowire – a tiny coaxial cable – that could vastly improve a few key renewable energy technologies, particularly solar cells, and could even impact other cutting-edge, developing technologies, such as quantum computing and nanoelectronics. Figure 1: A cross-section of a conventional coaxial cable Citation: Nanoscale ‘Coaxial Cables’ for Solar Energy Harvesting (2007, April 23) retrieved 18 August 2019 from https://phys.org/news/2007-04-nanoscale-coaxial-cables-solar-energy.html The nanowire, developed by researchers from the National Renewable Energy Laboratory (NREL) and Lawrence Berkeley National Laboratory, may solve several problems currently associated with renewable energy applications. Explore further Figure 2: A cross-section of the nanoscale coaxial cable, in which nitrogen, phosphorus, and gallium atoms are shown in blue, yellow, and magenta, respectively. White spheres represent hydrogen atoms, which help render the surface of the wire chemically non-reactive. Can Switzerland succeed without fossil fuels? GaN and GaP, like all semiconductors, are classified by “band gap” – how much energy is required for electrons in the material to jump from the top of the “valence band,” a range of energies for which they don’t participate in conduction, to the bottom of the “conduction band,” a range for which they do participate. When GaN and GaP are combined into a wire, the structure as a whole assumes its own band gap, which is very different from that of either component but much more appropriate for solar energy applications. Besides providing efficient charge separation, the design may be able to remedy several shortcomings of solar-energy applications. For example, they could help widen the coverage of the solar spectrum and minimize energy loss associated with electron-hole recombination.“We can tailor the properties of these cables to address the specific problems associated with each application,” said Zhang. “Beyond renewable energy applications, they could have exciting uses ranging from quantum computing to nanoelectronics.”This research is described in detail in the April 5, 2007, online edition of Nano Letters.Citation: Yong Zhang, Lin-Wang Wang, and Angelo Mascarenhas, “’Quantum Coaxial Cables’ for Solar Energy Harvesting.” Nano Lett. ASAP Article, DOI: 10.1021/nl070066tCopyright 2007 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. 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 Nokia launches latest handset: Nokia 6125 What Ainoa Is About:Ainoa 3G is about connectivity and quick and easy access to content via your PC, Playstation 3, a built-in 8.1 MP digital camera, video, music files, movie clips, social networking and in some regions TV. Ainoa has a 3-inch 432 x 240 pixel screen with 16,777, 216 color TFT, 55 MB internal memory with an 8-GB SanDisk micro-SD card slot, with compatibility to the full range of Sony memory cards. The sleek .06-inch depth and stylish 4-inch futuristic design has a retractable keypad, control wheel, an intuitive touch UI in media mode with easily navigable launch buttons for switching to various modes. The Question Is—What Can’t Ainoa Do?Ainoa Media Go allows users to keep up to date with the latest music and videos. Media Go transfers, plays and organizes all your music, photos, videos, podcasts by WiFi directly from your PC. PlayStation 3 owners may control and access media content on the Ainoa handset’s 3-inch vibrant screen any where and any time using Remote Play. Users may opt for local network connections or utilize the Internet with the built-in WAP 2.0 XHTML or Web feed from anywhere world-wide. Sony Ericsson announced the integrating and scintillating new smarter phone, Ainoa also spelled Aino in London on May 28, 2009. By smarter, I mean the future of communications is exemplified by the 4.1-inch x 2.0-inch x .06-inch, 4.7-ounce Obsidian Black Ainoa phone. Ainoa 3G with UMTS HSPA 850/1900/2100, UMTS HSUPA 850/1900/2100, GSM/GPRS/EDGE 850/900/1800/1900 will hook you up on every device you own, dream of owning or is on the drawing board in a R&D lab. The future is now. Sony Ericsson Ainoa 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: Sony Ericsson Ainoa Smarter Phone: Access All Media Content Any Time–Any Where (2009, May 31) retrieved 18 August 2019 from https://phys.org/news/2009-05-sony-ericsson-ainoa-smarter-access.html I will highlight some interesting features of Ainoa, for a full list see the following link. Ainoa has an 8.1 MP digital camera with a digital zoom up to 16x, picture blogging, geo tagging, image stabilizer, video blogging, picture fix, face detection, photo flash/light, video recording, red-eye reduction and touch or auto focus. As an entertainment device, Ainoa has FM radio with RDS, tracker, video streaming, video viewing, JAVA, motion gaming, 3D gaming and more. Ainoa music capabilities include shake control, Track I.D., MP3, AAC, MegaBass, Bluetooth Stereo A2DP, Media Player and stereo speaker capabilities. Connectivity is Ainoa’s middle name. Ainoa features PictBridge, WiFi, USB support, USB mass storage, synchronization, a modem, Bluetooth technology, DLNA certified, Google Maps and a GPS. Ainoa has all the organizing features one would expect, a calendar, flight mode, timer, world clock, notes and a touch screen. Ainoa’s communications and messaging features include, sound recording, predictive text input, instant messaging, picture messaging, text messaging, exchange active sync and email. As a phone, Ainoa features video calling, vibrate alert, speakerphone and polyphonic ringtones. Ainoa is currently advertised by Sony Ericsson in their Americas web site. It will be available in Mexico, Columbia, Ecuador, Peru and Venezuela and Western Europe and eventually world-wide. The current price for the USA is not available nor is the release date. Historically speaking, Ainoa Times refer to the era in Hawaiian history post-Western influence noted for being an era of mixed blessings, marked by the introduction of new diseases and exceptional adaptation to new circumstances.© 2009 PhysOrg.com Sony Ericsson Ainoa
As Vasilyev notes, there are a lot of areas in science that could benefit from an ability to isolate a single short signal amongst a stream of noise—astronomy, is just one example. Currently it is impossible to separate out a unique signal if there is just one burst present—there needs to be multiple examples. That could change in the near future as the researchers on this new effort have developed a way to convert radio signals to optical signals that can be processed to filter, separate and identify individual components.The team started with converting the radio signals to optical signals because the latter are more sensitive to changes in frequency—to make the conversation, the team looped the signals so that they could gather enough data for averaging. Next they used two tunable optical frequency combs—when the spectrums were overlapped it allowed for alignment of the components which caused the signal to be amplified as compared to other background noise, which then allowed it to be uniquely identified. The team tested their technique by running 4,720 detection attempts and found it to be better than 99 percent accurate.The researchers believe their technique can be broadened to include the detection of a wide variety of signals, from optic applications to those that look for microwaves. It could also possibly be modified for use in seemingly unrelated research areas such as sensing the spontaneous decay of a molecule. There also exists the possibility that the new detector could be used to spot signals that to date have gone undetected, perhaps revealing the existence of some new type of phenomena. Explore further Citation: New optical technique able to detect a single radio signal amongst background noise (2015, December 11) retrieved 18 August 2019 from https://phys.org/news/2015-12-optical-technique-radio-background-noise.html 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.
An international team of astronomers has observed the peculiar activity of a nuclear transient event known as PS1-13cbe. The transient, which occurred in the nucleus of the galaxy SDSS J222153.87+003054.2, experienced a rapid flare-up lasting about 70 days. The finding is reported in a paper published November 8 on arXiv.org. Researchers discover a blazar-like narrow-line Seyfert 1 galaxy 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 More information: Reza Katebi et al. PS1-13cbe: The Rapid “Turn on” of a Seyfert 1. arXiv:1811.03694 [astro-ph.GA]. arxiv.org/abs/1811.03694 © 2018 Science X Network The observed transient luminosities of PS1-13cbe from the PS1 survey in gr izyP1 filters after correction for Galactic extinction. S: marks the epoch of the LDSS spectrum (MJD 56570). Credit: Katebi et al., 2018. Citation: Rapid ‘turn-on’ of a nuclear transient observed by astronomers (2018, November 19) retrieved 18 August 2019 from https://phys.org/news/2018-11-rapid-turn-on-nuclear-transient-astronomers.html At a redshift of 0.12355, SDSS J222153.87+003054.2 (or SDSS J2221+0030 for short) is a type 2 Seyfert galaxy. It has a central supermassive black hole (SMBH) with an estimated mass of around 20 million solar masses.In general, Seyfert galaxies host active galactic nuclei (AGN) that produce spectra line emissions from highly ionized gas. Astronomers classify these galaxies as type 1 or 2, depending on the emission lines shown by their spectra.However, observations show that various AGN types are observed in the same object at different epochs of time. One explanation of this phenomenon is that some type 2 Seyfert galaxies are actually type 1 with inactive engines. This suggests that type 2 Seyfert galaxies are an evolved version of the type 1.Some AGNs showcase X-ray absorption variations, and are thus called “changing-look” AGNs. Furthermore, in some Seyfert galaxies, the broad emission lines disappear and, while in others broad emission lines appear, what astronomers describe as a “turn-on” of an AGN. So far, the most rapid “turn-ons” observed last less than one year.Now, a team of researchers led by Reza Katebi of Ohio University reports a rapid “turn-on” of the nuclear transient PS1-13cbe in the nucleus of the galaxy SDSS J2221+0030. PS1-13cbe was detected on July 9, 2013 in the Pan-STARRS1 (PS1) sky survey. Additional observations of this transient and its host galaxy, that led to the new findings, were conducted by the team using NASA’s Swift spacecraft, the 6.5 m Magellan Clay telescope and the 2.4 m Hiltner telescope.According to the paper, PS1-13cbe brightened in the course of about 70 days and reached a peak total optical luminosity of approximately 10.6 tredecillion erg/s, while its temperature roughly stayed constant. Moreover, this rapid “turn-on” of PS1-13cbe was accompanied by the appearance of broad Balmer lines and hence a transition to a type 1 Seyfert galaxy.”At the time of the outburst, the galaxy changed type to a Seyfert 1 as broad Hα and Hβ appeared and the continuum brightened in the spectrum taken with LDSS3 +57 days after the peak and then changed its type back to a Seyfert 2 as the broad Hα and Hβ disappeared in the spectrum taken with OSMOS 2 years later and did not reappear in spectra taken three and four years after the outburst,” the researchers wrote in the paper.The observations allowed Katebi’s team to conclude that PS1-13cbe is a “changing-look” AGN that has been powered by instabilities in the accretion disk. They added that the “turn-on” of this AGN is among the shortest observed in a “changing look” active galactic nuclei.
The capital is ready to host the fifth International Horti Expo 2013 and the eighth International Flora Expo come new year. The exhibition will have theme pavilions on fresh fruits and vegetables, farm machineries, potato products and technologies, cold chain, logistics, organic, medicinal herbal products and floriculture.This expo has the Union Ministry of Agriculture as its principal sponsor along with a host of other departments including the National Medicinal Plant Board and Indian Flowers and Ornamental Plants Welfare Association. Also Read – ‘Playing Jojo was emotionally exhausting”Flowers are unique and are for every occasion, even death. A person can refuse chocolate or pastry, but not flowers,’ said S Jafar Naqvi, President, Indian Flowers and Ornamental Plants Welfare Association (iFlora). ‘Due to rising income, craving of the new generation, globalisation and internet, people in India are willing to spend profusely on floral decoration. So, this news would be a relief for anyone wanting a chunk of the bourgeoning Indian floral decoration markets through flowers and floral accessories,’ he said. Also Read – Leslie doing new comedy special with NetflixLatest varieties of flowers like anthurium, gerbera and roses from Holland, Thailand, Germany, France and New Zealand will be exhibited in this Flora Expo, where Thailand is considered to be the main country in focus for blooms. There will also be a presentation with the theme of ‘Building Bridges through flowers between nations’. ‘IFlora and Flora Expo aim to increase per capita flower consumption even further to give more impetus to floriculture industry. We can’t have better time, and sky is the limit,’ said Jafar. India has a unique culture of flower consumption in many forms like garlands, flower-carpets, floral rains and floral jewelry etc in all celebrations. The Flora Expo will bring not only conventional flower and gardening industry professionals but also huge amount of buyers from new types of large industry retailers such as home centers, supermarkets, departmental stores and interior shops. And this exhibition is perhaps the only opportunity in India for international suppliers to meet and trade with all of them on one single platform.So flower lovers and nature enthusiasts can mark their calendars out and enjoy a nice winter evening checking out the blooms on display.DETAILAt: NSIC Exhibition Complex, Okhla When: 11 to 13 January
What inspired you to write Simian?When I was young, my grandmother used to tell me tales from the Ramayana and the Mahabharata as bedtime stories. My favourites involved Hanuman and Bali. Then as I grew older and I thought about them in detail, I found myself questioning certain aspects of the stories I couldn’t come to terms with. My grandmother couldn’t answer them, it was upto me. And I soon found, among others of my generation, that I wasn’t alone in this questioning. That was the seed of the idea for Simian. To deal with these questions in me. Also Read – ‘Playing Jojo was emotionally exhausting’Why do you think a legend like that of Hanuman’s needed a re-telling?These legends have been told and retold countless times in hundreds of languages over the past three thousand years. I don’t know why they have survived and others haven’t. All I know is that there must be a reason why they are so much a part of our culture and us. I think retelling these stories is part of their nature. They are open to it since they are not written in stone and that is what is so unique and beautiful about them. Also Read – Leslie doing new comedy special with NetflixHow did the story of Simian formulate in your mind? How difficult (or easy) was it to get it down on paper?The story formulated as a result of the delving questions I have had ever since my grandmother used to tell me the Ramayana as a young boy. It had a long gestation period. I had to mature into the person I am now for it to be ready. That part was beyond my control. Regarding difficulty; on the one hand the work was incredibly hard but on the other hand it made sense to me, so that made it easier. Does your graphic novel add any twists to the story that everyone knows?Yes, it does. The twists are in the depth of the characters and the unique and interesting exploration of what is so familiar to us in the story of the Ramayana. I dig deep and explore the characters relationships and motivations. Why did Sugriva kill his brother Bali? Why does Ram decide to stay in the forest even when Bharat comes to take him back? Why did Ravan really kidnap Sita? It is meant for both those readers familiar with the Ramayana, and those who don’t know anything about the story. Why did you pick Ramayana and Hanuman’s story?I picked the Ramayana because it means so much to me. I’ve known the story since before I can remember and that fascination with it has never left me. When my grandmother used to tell me the Ramayana and the Mahabharata, from that very young age I always identified more with the Vanars. And I chose Hanuman’s story because I found his story the most compelling. I also felt it hadn’t been explored yet, the way it should be.Do you have plans to take on any other character from any other epic in the future?Not yet. I’m working on part three of Simian right now. There’s time after that.If you weren’t an author what would you have been?Actually I’m a film-maker by training and profession, and being an author feels no different. I’m doing what I’ve always been doing, and that is telling stories.
If you thought you might miss out on Teej celebrations amidst the hustle and bustle of the Capital, think again! Delhi Tourism is organizing its annual Teej Festival at its three Dilli Haats on the below mentioned dates: Dilli Haat (INA) – 25 to 30 July, Dilli Haat (Pitampura) -25 to 27 July and Dilli Haat (Janakpuri) – 27 to 31 July. The festival marks the advent of the Shravan (monsoon season). The festival is dedicated to Goddess Parvati commemorating the day when she was united with Lord Shiva. Women celebrate this festival by applying mehndi on their hands and decking up in finery. Also Read – ‘Playing Jojo was emotionally exhausting’The major highlights of the events planned at the Dilli Haats are a Teej Bazaar offering Mehndi, Choori, Lehria and other items, Rajasthani delicacies and other traditional food items will be available at the food stalls set up specially for the festival, performances by folk artists, specially from the Nagaras from Banchar Village with a highlight of the Kachhi Ghodi dance. There will also be a mehndi competition at Dilli Haat – INA (26 July at 5.00 pm) and Janakpuri (30 July at 5.00 pm) along with Rangoli and Bindi Competition at Dilli Haat Janakpuri on 27 July at 5.00 pm and 29 July at 5.00 pm.There will also be camel rides at the venues along with a special children’s corner and traditional swings for the ladies to enjoy. The Janakpuri venue will also be hosting a rakhi bazaar during the festival. Head over!
Punjab Warriors continued their impressive run and came from a goal down to beat defending champions Delhi Waveriders 3-1 and register their third consecutive win in the Hockey India League on Friday. Down by a goal till the first three quarters, it took a spirited fightback from the Warriors to maintain their winning streak, pumping in three goals in the fourth and final quarter through Ciriello (50th minute), SV Sunil (54th) and Affan Yousuf (56th). Also Read – Khel Ratna for Deepa and Bajrang, Arjuna for JadejaIt was the Waveriders who struck early through Child’s superb strike. Child deflected in a fantastic diving goal after being set up by Akashdeep Singh’s pass from the left flank. Stung by the early goal, Punjab went on the attack but failed to score as the first quarter ended with Delhi enjoying slender lead. Warriors continued to mount attack in the second quarter and managed to equalise through Malak Singh. But the Waveriders went for the referral for an infringement and the goal was overturned. After change of ends, Waveriders’ tactics backfired as Warriors mounted pressure on the home team’s defence and scored at crucial junctures to walk away with the match.