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dpurdy

Hydrogen vehicle - Wikipedia, the free encyclopedia - 13 views

    • dpurdy
       
      Is hydrogen sustainable? depends on the source. see this highlight.
  • While methods of hydrogen production that do not use fossil fuel would be more sustainable
  • The challenges facing the use of hydrogen in vehicles include production, storage, transport and distribution.
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  • The hydrogen infrastructure consists mainly of industrial hydrogen pipeline transport and hydrogen-equipped filling stations like those found on a hydrogen highway. Hydrogen stations which are not situated near a hydrogen pipeline can obtain supply via hydrogen tanks, compressed hydrogen tube trailers, liquid hydrogen tank trucks or dedicated onsite production.
  • Hydrogen use would require the alteration of industry and transport on a scale never seen before in history. For example, according to GM, 70% of the U.S. population lives near a hydrogen-generating facility but has little access to hydrogen, despite its wide availability for commercial use.[64] The distribution of hydrogen fuel for vehicles throughout the U.S. would require new hydrogen stations that would cost, by some estimates approximately 20 billion dollars[65] and 4.6 billion in the EU.[66] Other estimates place the cost as high as half trillion dollars in the United States alone.[67]
  • Hydrogen fuel does not occur naturally on Earth and thus is not an energy source, but is an energy carrier. Currently it is most frequently made from methane or other fossil fuels. However, it can be produced from a wide range of sources (such as wind, solar, or nuclear) that are intermittent, too diffuse or too cumbersome to directly propel vehicles. Integrated wind-to-hydrogen plants, using electrolysis of water, are exploring technologies to deliver costs low enough, and quantities great enough, to compete with traditional energy sources.[2]
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    Fuel cell cars are expensive.  The fuel cell costs a lot
Randolph Hollingsworth

Information Source Use Patterns of Wikipedia - 19 views

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    New research report from Isto Huvila of Sweden from user survey seeing to explain the different kinds of Wikipedia users and the quality of their contributions. References to other Wikipedia research are included and summarized to show the scholarly community's growing consensus about its reliability and validity. Refers also to new uses of Wikipedia, e.g., scholary journal requiring authors to post their summaries in Wikipedia.
Peter Beens

Reference.com - 33 views

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    Word of the Day, Most often misspelled words, crossword tools
Tracy Tuten

Reading and the Web - Texts Without Context - NYTimes.com - 28 views

  • In his deliberately provocative — and deeply nihilistic — new book, “Reality Hunger,” the onetime novelist David Shields asserts that fiction “has never seemed less central to the culture’s sense of itself.”
  • Mr. Shields’s book consists of 618 fragments, including hundreds of quotations taken from other writers like Philip Roth, Joan Didion and Saul Bellow — quotations that Mr. Shields, 53, has taken out of context and in some cases, he says, “also revised, at least a little — for the sake of compression, consistency or whim.”
  • It’s also a question, as Mr. Lanier, 49, astutely points out in his new book, “You Are Not a Gadget,” of how online collectivism, social networking and popular software designs are changing the way people think and process information, a question of what becomes of originality and imagination in a world that prizes “metaness” and regards the mash-up as “more important than the sources who were mashed.”
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  • Mr. Lanier’s book, which makes an impassioned case for “a digital humanism,” is only one of many recent volumes to take a hard but judicious look at some of the consequences of new technology and Web 2.0. Among them are several prescient books by Cass Sunstein, 55, which explore the effects of the Internet on public discourse; Farhad Manjoo’s “True Enough,” which examines how new technologies are promoting the cultural ascendancy of belief over fact; “The Cult of the Amateur,” by Andrew Keen, which argues that Web 2.0 is creating a “digital forest of mediocrity” and substituting ill-informed speculation for genuine expertise; and Nicholas Carr’s book “The Shallows” (coming in June), which suggests that increased Internet use is rewiring our brains, impairing our ability to think deeply and creatively even as it improves our ability to multitask.
  • Steven Johnson, a founder of the online magazine Feed, for instance, wrote in an article in The Wall Street Journal last year that with the development of software for Amazon.com’s Kindle and other e-book readers that enable users to jump back and forth from other applications, he fears “one of the great joys of book reading — the total immersion in another world, or in the world of the author’s ideas — will be compromised.” He continued, “We all may read books the way we increasingly read magazines and newspapers: a little bit here, a little bit there.”
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    Highly insightful and developed argument for how Web 2.0 is changing how we process information, learn, and develop opinions. 
Maya Salganek

Free reference manager and PDF organizer | Mendeley - 32 views

  • Mendeley is a free reference manager and academic social network that can help you organize your research, collaborate with others online, and discover the latest research.
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    Academic reference management software for researchers
Roland Gesthuizen

Comparison of Citation Software at MIT - Overview of Citation Software at MIT: Managing Your References - Research Guides at MIT Libraries - 74 views

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    Overview of Citation Software at MIT: Managing Your References. Endnote, RefWorks and Zotero
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    There's so many other options out there now...Mendeley, Qigga, etc.
Marc Patton

coolteacherlinks - 1 views

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    Please explore for great teacher resources, reference links, and other teaching resources. free lesson plans . . . teacher resources . . . student resources . . . and links to online quizzes, contests, and reference materials
Roland Gesthuizen

ReferenceME for iPhone 3GS, iPhone 4, iPhone 4S, iPod touch (3rd generation), iPod touch (4th generation) and iPad on the iTunes App Store - 51 views

  • all the references generated can be sent to your essay via email
  • ReferenceME creates Bibliographies, Citations/Footnotes for Harvard, Chicago, Vancouver, MHRA, MLA, Oxford and APA.
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    "Better essays, faster! Simply scan the barcode of a book using your mobile phone camera, and ReferenceME will create your bibliography and citations in moments. If there is no barcode you can simply enter the books ISBN or you can enter the details yourself, and turn them into references in any of the major styles used by universities and libraries."
Carol Mortensen

Weather Vortex Main Page - 1 views

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    "Weather is a set of all the phenomena occurring in a given atmosphere at a given time. Weather phenomena lie in the hydrosphere and troposphere. Weather refers to current activity, as opposed to the term climate, which refers to the average atmospheric conditions over longer periods of time. When used without qualification, "weather" is understood to be the weather of Earth."
Kenuvis Romero

Art of memory - Wikipedia, the free encyclopedia - 0 views

  • The Art of Memory or Ars Memoriae ("art of memory" in Latin) is a general term used to designate a loosely associated group of mnemonic principles and techniques used to organize memory impressions, improve recall, and assist in the combination and 'invention' of ideas. An alternative and frequently used term is "Ars Memorativa" which is also often translated as "art of memory" although its more literal meaning is "Memorative Art". It is sometimes referred to as mnemotechnics.[1] It is an 'art' in the Aristotelian sense, which is to say a method or set of prescriptions that adds order and discipline to the pragmatic, natural activities of human beings.[2] It has existed as a recognized group of principles and techniques since at least as early as the middle of the first millennium BCE,[3] and was usually associated with training in rhetoric or logic, but variants of the art were employed in other contexts, particularly the religious and the magical. Techniques commonly employed in the art include the association of emotionally striking memory images within visualized locations, the chaining or association of groups of images, the association of images with schematic graphics or notae ("signs, markings, figures" in Latin), and the association of text with images. Any or all of these techniques were often used in combination with the contemplation or study of architecture, books, sculpture and painting, which were seen by practitioners of the art of memory as externalizations of internal memory images and/or organization.
ZeroDivide .

Nova Fabric of the cosmos The illusion of time full video - YouTube - 48 views

  • The Evolution of Time and the Carnot Cycle at the Edge of the Universe
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    We are all time travelers... drifting through time at a steady pace, one moment at a time. In what direction are we moving through time? Or does time move through us? How many dimensions of time are there? Though slightly allegorical, three-dimensional time offers physics new parameters, accounting for conventional and exotic physical phenomena, while maintaining the conservation of energy and symmetry groups found in physical law.  I began playing with the idea that all of physics could be reduced to just interactions between spatial and temporal coordinates. I wondered if inertia and momentum might be composed strictly of temporal components. This would require extra time dimensions. Could inertia or momentum be used as indicators of multi-dimensional time? What about charge, spin, and other properties of matter? Answers to some of these questions appeared to reside in neutrino research, specifically neutrino flavor oscillation.  The universality between Thermodynamics and Temporal Mechanics can reduce the fundamental forces of nature into a single expression, a new equivalence principle, which can be used as the generator for the evolution of time. Once Quantum Mechanics is seen through the lens of three-dimensional time, the EPR paradox looses its mystique. The speed of light may be restricted to a set speed limit within each individual frame of reference, however, frames of reference can undergo periods-of-time at varying rates of the passage-of-time. If the positive side of absolute zero is a state of condensed matter, what is on the negative side of absolute zero? Uncondensed matter?  The anti-matter aspect of the Dirac equations may have been misinterpreted. The convention is to assume that "matter" is composed of "particles" distinctly different from "antimatter" composed of "antiparticles". The assumption of one time dimension locks in this interpretation of the Dirac Equations. However, the uniform production of particles and antipa
Misha Miller

Using Groups Effectively: 10 Principles » Edurati Review - 50 views

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    "Conversation is key . Sawyer succinctly explains this principle: "Conversation leads to flow, and flow leads to creativity." When having students work in groups, consider what will spark rich conversation. The original researcher on flow, Mihaly Csikszentmihalyi, found that rich conversation precedes and ignites flow more than any other activity.1 Tasks that require (or force) interaction lead to richer collaborative conceptualization. Set a clear but open-ended goal . Groups produce the richest ideas when they have a goal that will focus their interaction but also has fluid enough boundaries to allow for creativity. This is a challenge we often overlook. As teachers, we often have an idea of what a group's final product should look like (or sound like, or…). If we put students into groups to produce a predetermined outcome, we prevent creative thinking from finding an entry point. Try not announcing time limits. As teachers we often use a time limit as a "motivator" that we hope will keep group work focused. In reality, this may be a major detractor from quality group work. Deadlines, according to Sawyer, tend to impede flow and produce lower quality results. Groups produce their best work in low-pressure situations. Without a need to "keep one eye on the clock," the group's focus can be fully given to the task. Do not appoint a group "leader." In research studies, supervisors, or group leaders, tend to subvert flow unless they participate as an equal, listening and allowing the group's thoughts and decisions to guide the interaction. Keep it small. Groups with the minimum number of members that are needed to accomplish a task are more efficient and effective. Consider weaving together individual and group work. For additive tasks-tasks in whicha group is expectedtoproduce a list, adding one idea to another-research suggests that better results develop
Gregory Louie

Re-ordering bookmarks - 108 views

Hi Maggie, I would love to see both a user's personal rating system combined with a reader's rating system - kinda like editor's comments & reader's comments on Amazon. Creating lists could also ...

bookmarks

Ronelle Wanner

Fair Use and Copyright for Teachers - 8 views

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    Copyright Law, Fair Use for Teachers, Challenges for Educators, Questions and Restrictions, Helpful Chart, References
Maggie Verster

Great stuff!!!! Librarians' Internet Index - 61 views

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    This is a list of sites compiled by librarians to safe use internet sites. A great reference for school administrators, techies and teachers. It is a maintained directory of sorts and you can submit safe sites.
Steve Ransom

CustomGuide - Free Computer Training Quick References, Cheat Sheets - 63 views

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    Great quick reference guides
Julie Whitehead

Citation Machine - 109 views

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    Helps build citations and references for APA and MLA
Kate Pok

Accessing Your Zotero Library on an iPad with Mendeley - ProfHacker - The Chronicle of Higher Education - 52 views

  • And the greatest drawback to this method: it’s one-way. If you make any changes to a reference within Mendeley, those changes will not be reflected in Zotero. This drawback is most apparent to me when I read PDFs. Let’s say I have a reference with an attached PDF in Zotero and I want to read it on my iPad (the Mendeley App has a native PDF reader, but you can also open PDFs in external apps, like iAnnotate). If I’m using the Zotero→Mendeley Desktop→Mendeley iPad app method, and I open that PDF on my iPad, any annotations I make on the PDF will not show up in Zotero.
Debra Gottsleben

SlimeKids - School Library Media Kids - 15 views

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    School library media Kids, an innovative new site packed with games and book trailers, is designed to provide a fun, interactive learning experience to get students motivated to learn on their own! They can choose from exceptional literacy-related resources such as author and book review websites as well as superb educational tools including reference works and search engines.
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    check out this site! A good one to add to your libguide!
Thieme Hennis

Class Assignments: Social Psychology - 32 views

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    reference list of class assignments and projects in social psychology.
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