Jump to content

evern

Members
  • Posts

    8
  • Joined

  • Last visited

evern's Achievements

Lepton

Lepton (1/13)

1

Reputation

  1. - OH is protonated - h2o is lost leaving a +ve charge on a 3* C - +ve does not migrate due to stability due to hyperconjugation - depending on media product is a combination of (an alcohol - minor since h+ media) and an alkene.(namely 3-ethyl pent-2-ene) As for the second part could you please attach picture of the compounds because I doubt trans cyclohexane alkenens are stable enough to use in sythesis.
  2. evern

    Ebook readers

    could we couple a fast charging battery with a wireless charging method? e.g. battery: http://en.wikipedia....osphate_battery with wireless charging: http://www.powermat.com/ Note that i'm unsure what sort of battery life we could expect from such an arrangement.but a couple of the more popular portable tablets' lifetimes are shown below. Could we estimate what sort of battery life such an arrangement may give? !And even if you don't reply please do answer the poll! thank you
  3. evern

    Ebook readers

    captain, thank you for pointing that out. --------- The battery (power) is a great place to start .Does anyone know of a type or have any ideas for a type specifically designed for long term use (e.g.Ni-Mh is great for small bursts like cameras)?or a low power display e.g. e-ink uses very little power but is not self lit. Does anyone know what the power consumption distribution is in any such device ( how much to the screen ;how much for speaker,if there are any,;how much for wifi ;etc)?
  4. evern

    Ebook readers

    Captain panic, Thank you for pointing out the flaw in the poll...Though i am not sure i know how to amend it. You make several strong points in your post.The 2 primary points being the price difference and drm.Cost is one of the things I had hoped to address through this thread.In your opinion is it possible to design an ebook reader which is cheap enough to overcome this obstacle?(Note most contemporary ebook readers use e-ink which is dirt cheap to manufacture.The bulk of the cost,as seen by end users, lies in its licensing rights).In my post I had intended to first answer whether it was technologically feasible i.e. can it be made? (and sold at 0 profit ), before moving on to whether the existing licenses and patents make that design uneconomical. As for drm ,yes that does continue to be a problem, and many eloquent arguments have been made both for and against it.However there are an increasing number of free ebook (or other electronic text) reasources) availiable.These are maintained by professional organizations or by groups of voluteers (project gutenberg,google books,the ocw from various universities(several offer complete ebook e.g. strang mit ocw), books such as the light an matter series).Despite this ,for the present day, the core of your drm argument still stands. I would also like to point out (to all of this thread's readers) that if you don't like or use ebooks(or other electronic textual matter).Then please do not hesitate to point that out here.In order to design an ebook reader which is better than those of the existing generation it is necessary to understand what about this generation does not sit well and what about good old fashioned books is so endearing to many readers.I however do urge you to articulate the causes for your reluctance to the extent possible.
  5. Many people use ebooks whether as a primary source of (books) reading material or for occasional lighter reading.I myself, being a college student, find them quickly replacing most conventional books that my teachers recommend. It seems highly likely that ebooks will replace most conventional books over the next 5 years (there are already several indicators that this may happen even earlier- ebook sales at Amazon have exceeded their physical book sales). From what I gather the major detriment to the widespread use to ebooks is the difference between ebook readers and physical books.Many people I have talked to have described ebook readers(ipad (not primarily a reder but used as one),kindle sony,etc) as not being tactile enough.You can fold pages in a book, write notes in the margins(a practice I do not agree with but is non the less widespread (textbooks primarily), etc.Another major detriment is the price of ebook readers. ($120 - ). I intended this thread to discuss these 2 points. How cheap can we design an ebook reader? To make them widespread their cost would need to be cheaper than paper printing? And how like a paper book (tactile and integrable) can we make it? furthermore If possible I propose to design our own reader ,cheaper and more comfortable than those commercially available. I am am aware of several existing technologies , for instance flexible screen OLED's, which allow us to design more tactile and integrable ebook readers.perhaps we could begin by discussing the merits of those.
  6. I'm not sure what the conventions pertaining to such a post are or even if this is the correct place to post this ,so please pardon any deviance from normal convention. Does anyone know of a science (physics?,math) based project that we could participate in.If there are none could we start our known i.e. anybody have any ideas as to what to look at.I thought the the idea of completing a project purely through a web-collaborative structure is quite an interesting one.
  7. for really cool temperature ,you have to use lasers.There are a number lasers focused on a point....these cover all directions of motion.A particle at this point ,irrelevent of its direction of motion,collides with at least a single laser beam.Its momentum is canceled by the collision with the photon.This takes a long time but it can achieve liq He temps.
  8. Hello i'm evern....I enjoy studying most sciences...maths,physics,biology......would really like to participate in some research based projects.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.