Tag Archive for Tag: 上海七宝楼风

Tag: 上海七宝楼风 Lenovo applies for a patent for a grip tablet keyboard

first_imgThe patent application was apparently made back in 2010, but thus far, Lenovo has not made such a device available for sale. It’s not known if they plan to, or if the company decided the idea wouldn’t sell. At any rate, the dual keypads talk to the tablet wirelessly either through Bluetooth or infrared, and because they are clamped on when needed, can be placed anywhere on the tablet. Their small size also makes them much more portable than a wireless keyboard.The patent application also notes that the original design calls for a standard QWERTY keyboard, though others might be added as well and that the dual keyboards can also be placed flat on a table in front of the tablet, if desired, to serve in a more conventional way. 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) — With the introduction of the tablet computer, users of such devices have been forced to make some tradeoffs regarding keyboards. Virtually all tablets make use of image display and finger touching or tapping to create a virtual keyboard, which for many, is not nearly the same as one that provides the tactile feedback of keys being pressed and released. To get around this, many have resorted to purchasing wireless keyboards, which do offer the ease of typing, but detract from the portability that is so critical to the tablet experience. Now, according to Patentbolt, Chinese hardware maker Lenovo has applied for a patent that gives users the best of both worlds. Explore further Tablet keyboard cases turn Android devices into netbookscenter_img Citation: Lenovo applies for a patent for a grip tablet keyboard (2012, May 29) retrieved 18 August 2019 from https://phys.org/news/2012-05-lenovo-patent-tablet-keyboard.html The idea is rather clever. Instead of going with a standard keyboard shape or trying to create a big overlay, Lenovo has come up with a way to clamp two tiny keyboard devices to either side of a tablet with tiny cell phone size keys on both top and bottom. Users hold onto their tablet by holding onto the keyboards, or more descriptively, their keypads. Each keypad has keys on both the top and bottom part; one has the keys for typing words and numbers, the other for control mechanisms such as the space bar, or Ctrl key. If the lettered keys are on the bottom side, users can type with their fingers as they grip. Conversely, if the keys are on the top side, they can type as they do with messaging on their cell phones, i.e. using their thumbs. © 2012 Phys.Orglast_img read more

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Tag: 上海七宝楼风 Researchers use new technique to date CAIs and chondrules

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. More information: The Absolute Chronology and Thermal Processing of Solids in the Solar Protoplanetary Disk, Science, 2 November 2012: Vol. 338 no. 6107 pp. 651-655 DOI: 10.1126/science.1226919ABSTRACTTransient heating events that formed calcium-aluminum–rich inclusions (CAIs) and chondrules are fundamental processes in the evolution of the solar protoplanetary disk, but their chronology is not understood. Using U-corrected Pb-Pb dating, we determined absolute ages of individual CAIs and chondrules from primitive meteorites. CAIs define a brief formation interval corresponding to an age of 4567.30 ± 0.16 million years (My), whereas chondrule ages range from 4567.32 ± 0.42 to 4564.71 ± 0.30 My. These data refute the long-held view of an age gap between CAIs and chondrules and, instead, indicate that chondrule formation started contemporaneously with CAIs and lasted ~3 My. This time scale is similar to disk lifetimes inferred from astronomical observations, suggesting that the formation of CAIs and chondrules reflects a process intrinsically linked to the secular evolution of accretionary disks.Press release Chondrules from the chondrite Grassland, L4. Credit: Wikipedia. Explore further Citation: Researchers use new technique to date CAIs and chondrules (2012, November 2) retrieved 18 August 2019 from https://phys.org/news/2012-11-technique-date-cais-chondrules.html Chondrules younger than thoughtcenter_img Journal information: Science © 2012 Phys.org (Phys.org)—Researchers working out of the University of Copenhagen have published a paper in the journal Science in which they claim that a new method of dating chondrules and calcium-aluminum–rich inclusions (CAIs) is more accurate than previous methods. Their dating method produces results that contradict earlier findings that have suggested that chondrules formed up to 2 million years later than CAIs; instead they say, the two materials found in meteorites formed at roughly the same time. Scientists believe that the sun and all of its orbiting bodies formed from a spinning disk approximately 4.6 billion years ago. Theory suggests the sun came first, initially surrounded by a cloud of dust and gas that over time became the planets, comets and asteroids. But for that to happen, some bit of material had to bind together first, and researchers believe two of them – chondrules and CAIs – are still present in modern meteorites. Up till now however, there has been disagreement among researchers regarding the age of such materials found in meteorite samples that have struck the Earth.Prior attempts to measure the age of materials in meteorite samples involved using techniques to discern how much aluminum 26 was present. The thinking was that differences in the levels of the isotope indicated different ages. The problem with this methodology, the new team points out, is that it ignores the possibility that objects forming in different locations might naturally have different amounts of the isotope in them.Their new technique involves isolating small amounts of lead found in a sample and then measuring the isotopic composition of both it and uranium and then calculating the age of the material using the known rate of decay of uranium. Using this method, the team calculated that both materials in a meteorite sample were approximately 4.56730 billion years old. And because their method is so precise they say the error rate of their technique is just 160,000 years.If the new method for calculating the age of chondrules and CAIs is adopted by the scientific community it will likely mean revising some ideas regarding the makeup of the early universe.last_img read more

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