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polykarp (Cambridge, U.K.)

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Komputerbay 32GB (8x 4GB) DDR2 PC2-6400F 800MHz ECC Fully Buffered FB-DIMM (240 PIN) 32 GB w/ Heatspreaders for Apple computers
Komputerbay 32GB (8x 4GB) DDR2 PC2-6400F 800MHz ECC Fully Buffered FB-DIMM (240 PIN) 32 GB w/ Heatspreaders for Apple computers
Offered by KOMPBAY
Price: £300.00

2 of 2 people found the following review helpful
5.0 out of 5 stars Excellent ... so far, 4 Mar. 2013
Verified Purchase(What is this?)
Mixed reviews and the very competitive pricing seemed to imply that the quality of the 32 GB of ECC memory I decided to buy from Komputerbay could be variable to say the least.

I went ahead and ordered, conscious of the risk I was taking though, ordering through Amazon, and Komputerbay's emphasis on their 'lifetime' guarantee (no complaints from customers about compliance) I thought afforded some reassurance.

Immediately on delivery I tested all 32 GB continuously for 22 hours with Memtest86 v.4.2. Result: no errors.

I have now been using it for about a week with no problems. Failure may occur randomly much later of course but, so far this memory has been an excellent buy.

Chess for Children
Chess for Children
by Raymond Bott
Edition: Hardcover

1 of 1 people found the following review helpful
4.0 out of 5 stars Attractive book - clear and gimmick-free, 14 April 2012
Verified Purchase(What is this?)
This review is from: Chess for Children (Hardcover)
This book will transport you instantly back to the 1950s and it is none the worse for that; chess has not essentially changed since then.

The book appeared in 1958, written by two primary school teachers ( Bott and Morrison ) and that is the source of its strength: the authors were actively involved in promoting chess among schoolchildren and understanding of their audience shines through their leisurely explanations and a profusion of clear diagrams.

The simple illustrations have a dated charm very much of their era.

How the pieces move is described in the first 27 pages, followed by 60 pages on simple game play ( including check, checkmate, castling and 'en passant'.

This is followed by a 14 page section on notation which is the only serious defect of the book for the simple reason that it is obsolete ( P-K5 instead of Pe5 ) though it could be argued that, given its simplicity and universal use in the past, it is useful to be aware of this notation but maybe not at this early stage and not for children - it can be skipped.

There follow 17 pages on forks pins and discovered check, then 18 pages on 'Mating Patterns' which, in spite of its ambiguous title, is very relevant, discussing, as it does, possible and impossible combinations of pieces to chekmate an opponent ( e.g. you cannot checkmate with king and bishop against king ).

The book continues with a number of short sections on winning, drawing ( some interestingly arcane rules ) stalemate and a short selection of 'Games with Comment' played by children.

The book ends with a short section of general comments and the answers to all the chess 'quizzes' which adorn the rest of the book.

You really can learn to play chess with this book ( suitable for beginners from 8 to 80 according to the authors ).
Copies seem to be available second-hand only but the price of some of these makes it a real bargain.
Comment Comment (1) | Permalink | Most recent comment: Dec 3, 2013 7:55 AM GMT

Dreams That Stuff Is Made Of
Dreams That Stuff Is Made Of
by Stephen Hawking
Edition: Hardcover
Price: £21.59

23 of 24 people found the following review helpful
4.0 out of 5 stars A Marketing Exercise - but good value from Amazon, 7 Dec. 2011
Verified Purchase(What is this?)
You want to know more about the original publications of the inventors of quantum mechanics and read their own words? Then this large volume is very good value. Though what you get out of it will depend strongly on your technical background in physics and what you expect from your reading.

The selection of papers was presumably made by Stephen Hawking. If so, it is rather odd in that a number of key papers are missing. In particular Bohr's famous paper 'On the Quantum Theory of Line-Spectra' is replaced by a much later review article. No doubt this makes for easier reading but it is not in the spirit of the book as advertised. Again, the key paper by Born Heisenberg and Jordan 'On Quantum Mehanics' is not there, probably for the same reason. As usual in US/UK physics de Broglie's contribution is absent. Amazingly there are 2 long papers by David Bohm on his hidden variables interpretation of quantum mechanics (39 pp!) which has had zero influence on current physics.

The introduction by Hawking is a (very) brief history of the subject which seems to be present mainly to justify his name on the cover. It does not discuss the contents in detail. It also looks as if Hawking was not involved in the brief commentaries heading each chapter: these are attributed to Joel Allred. They will not help you to understand the papers. (If you want to know what can be done to explain the papers and their history in detail, look at '100 Years of Planck's Quantum' by Duck and Sudarshan or 'Sources of Quantum Mechanics' by van der Waerden.)

A largish proportion of this volume is taken up by review artcles and even a couple of chapters from a popular book by Gamow; hardly 'the most astounding papers ...' promised on the dust jacket. Even so, it does cover a large range - up to work by Feynman, Schwinger et al.

The book has a clear typeface, all papers have been translated and reset (expect typos) and it is nicely bound. So if you know some physics already - about degree level - it represents unbeatable value at Amazon's price. Get it for the price of a couple of drinks.

100 Years of Planck's Quantum
Sources of Quantum Mechanics (Dover Books on Physics)
Comment Comments (3) | Permalink | Most recent comment: Sep 13, 2013 9:06 AM BST

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