Web Design patterns
AJAX patterns
forras
Tuesday, June 07, 2005
Ian Suttle: Applying AJAX Using ASP.NET 1.1
You’ve heard of it. It is the latest buzz term for web programmers these days. AJAX is an acronym that stands for Asynchronous JavaScript and XML. AJAX gains its popularity by allowing data on a page to be dynamically updated without having to make the browser reload the page. I will describe more about how AJAX works, and then go into some sample code to try out.
Ami a GetUsernameList()-ben tortenik az eleg csunya, de itt most nem is ez a lenyeg.
Ami a GetUsernameList()-ben tortenik az eleg csunya, de itt most nem is ez a lenyeg.
Saturday, May 21, 2005
Chip Chapin: Chip's CD Media Resource Center
What's Here
This document contains basic practical information for users of CD media, especially CD-recordable, or CD-R. Serious users of CD-R will naturally have several important questions about the medium, including:
* What kind should I buy?
* How long will they last?
* Does recording speed matter?
This document provides answers (with varying degrees of authority) for each of these questions.
Besides the basic information, I felt it necessary or worthwhile to include some detailed background information about the structure and organization of the discs. How many bits are stored on CD? Lots more than most people realize. This was the type of information that I thought would be easy to find on the internet in the year 2000. But it wasn't. I had to check and compare a number of different sources in order to pull it all together.
Disclaimer: I am not now, nor ever have been, an expert on CD media. These were my own questions. In researching the answers for myself I wrote this document. -- Chip
Why This Document?
In December 2000 I completed a project transferring about 5 hours of audio interviews with elder family members to audio CDs using CD-Rs. My intent was that the discs would last for at least one family generation (25 years or more).
But the very day that I sent out copies to various family members I began to worry about how long these CD-Rs would last. I vaguely recalled hearing something about the instability of the dye layer. I didn't know what the "dye layer" was -- perhaps it would fade or run? Kodak offers CD-Rs that are supposed to last 12 times longer (than what?). Should I redo all the copies using these special archival (i.e. "more expensive") media?
I also began to worry that I had erred in recording my discs at high speed (8x). One of my friends had heard that CD-R creation is somehow better when done at low speed (1x or 2x). I know that low speed duplication is superior for analog tape, but it had never occurred to me that it could make any difference to a digital medium.
Anyway, having no real idea of how long CD-Rs would last, or of the real differences between "gold" and "silver" discs, etc., I decided to research the questions. My results are summarized here, along with many links that I found helpful along the way.
This document contains basic practical information for users of CD media, especially CD-recordable, or CD-R. Serious users of CD-R will naturally have several important questions about the medium, including:
* What kind should I buy?
* How long will they last?
* Does recording speed matter?
This document provides answers (with varying degrees of authority) for each of these questions.
Besides the basic information, I felt it necessary or worthwhile to include some detailed background information about the structure and organization of the discs. How many bits are stored on CD? Lots more than most people realize. This was the type of information that I thought would be easy to find on the internet in the year 2000. But it wasn't. I had to check and compare a number of different sources in order to pull it all together.
Disclaimer: I am not now, nor ever have been, an expert on CD media. These were my own questions. In researching the answers for myself I wrote this document. -- Chip
Why This Document?
In December 2000 I completed a project transferring about 5 hours of audio interviews with elder family members to audio CDs using CD-Rs. My intent was that the discs would last for at least one family generation (25 years or more).
But the very day that I sent out copies to various family members I began to worry about how long these CD-Rs would last. I vaguely recalled hearing something about the instability of the dye layer. I didn't know what the "dye layer" was -- perhaps it would fade or run? Kodak offers CD-Rs that are supposed to last 12 times longer (than what?). Should I redo all the copies using these special archival (i.e. "more expensive") media?
I also began to worry that I had erred in recording my discs at high speed (8x). One of my friends had heard that CD-R creation is somehow better when done at low speed (1x or 2x). I know that low speed duplication is superior for analog tape, but it had never occurred to me that it could make any difference to a digital medium.
Anyway, having no real idea of how long CD-Rs would last, or of the real differences between "gold" and "silver" discs, etc., I decided to research the questions. My results are summarized here, along with many links that I found helpful along the way.
Andy McFadden's CD-Recordable FAQ
What does this FAQ cover (and not cover)?
This document attempts to answer Frequently Asked Questions about Compact Disc Recordable technology and related fields. It was originally developed as a Usenet newsgroup FAQ, and is updated and posted about once a month. The main foci are explaining CD-R technology, describing hardware and software solutions for creating audio CDs and CD-ROMs, and helping people find solutions to common problems.
The FAQ is heavily biased toward PCs and computer-based recorders, because that's what I'm most familiar with, but I have made an effort to include useful information for owners of other equipment. I don't anticipate the section on stand-alone audio CD recorders expanding greatly, because they're far simpler to operate than computer-based recorders, and most of the "must know" information about them is more appropriate in an FAQ on stereo systems or studio recording. I do try to address deficiencies in Macintosh coverage.
I don't usually address questions that can be phrased, "how do I make my software do this?" The answers to those should be in the manual that came with your software. In general, this is a collection of answers to specific questions, not a "how to" guide. I have tried to make the answers easy to understand by an inexperienced user, but if you know absolutely nothing about recording CDs then some sections may be confusing.
This is not a newsletter. Actively maintained web sites are a much better source of breaking news than this document, which is updated at most once a month. I also don't try to track moving targets, like CD recorder firmware versions or software versions unless a specific release is especially interesting. Ditto for which recorders work with which packet-writing solutions, or which recorders can overburn.
This FAQ does not, and will not, cover DVD, DVD-ROM, DVD-R, DVD-RAM, DVD-RW, DVD+RW, or any of the other formats in the ever-expanding DVD morass. There are other resources on the web for DVD topics.
You will not find a lot of detail about "backing up" copy-protected software, or where to find unlock codes or "warez". There are many web sites that explain these matters at length.
This document attempts to answer Frequently Asked Questions about Compact Disc Recordable technology and related fields. It was originally developed as a Usenet newsgroup FAQ, and is updated and posted about once a month. The main foci are explaining CD-R technology, describing hardware and software solutions for creating audio CDs and CD-ROMs, and helping people find solutions to common problems.
The FAQ is heavily biased toward PCs and computer-based recorders, because that's what I'm most familiar with, but I have made an effort to include useful information for owners of other equipment. I don't anticipate the section on stand-alone audio CD recorders expanding greatly, because they're far simpler to operate than computer-based recorders, and most of the "must know" information about them is more appropriate in an FAQ on stereo systems or studio recording. I do try to address deficiencies in Macintosh coverage.
I don't usually address questions that can be phrased, "how do I make my software do this?" The answers to those should be in the manual that came with your software. In general, this is a collection of answers to specific questions, not a "how to" guide. I have tried to make the answers easy to understand by an inexperienced user, but if you know absolutely nothing about recording CDs then some sections may be confusing.
This is not a newsletter. Actively maintained web sites are a much better source of breaking news than this document, which is updated at most once a month. I also don't try to track moving targets, like CD recorder firmware versions or software versions unless a specific release is especially interesting. Ditto for which recorders work with which packet-writing solutions, or which recorders can overburn.
This FAQ does not, and will not, cover DVD, DVD-ROM, DVD-R, DVD-RAM, DVD-RW, DVD+RW, or any of the other formats in the ever-expanding DVD morass. There are other resources on the web for DVD topics.
You will not find a lot of detail about "backing up" copy-protected software, or where to find unlock codes or "warez". There are many web sites that explain these matters at length.
Wednesday, May 18, 2005
Memoriakartyak digitalis fenykepezogepekhez
Az index cikke cimszavakban:
Jelenleg forgalomban lévő legfontosabb kártyatípusok
De vajon mennyire elterjedtek az egyes típusok?
Árak
Milyet vegyünk?
Milyen sebességűt?
Mekkora kapacitásút vásároljunk?
A szokásos kérdés: márkásat vagy nem márkásat vegyek?
Speciális kártyák
A cikkben tobb helyen emlegetett RAW formatum:
A felsőbb kategóriás digitális fényképezőgépek többsége lehetővé teszi az érzékelő (CCD vagy CMOS) által rögzített képeket feldolgozás nélkül, nyers (RAW) formátumban történő elmentését. A módszer előnye, hogy a kép sokkal több információt tartalmaz, mint amit a JPEG formátumban le lehet tárolni, így a kép expozíciójának, fehéregyensúlyának és egyéb jellemzőjének állítása, finomhangolása utólag is "büntetés nélkül" elvégezhető. A nyers formátum használatának a hátránya, hogy a képek utólagos feldolgozás nélkül használhatatlanok. A nyers formátumot digitális negatívként is emlegetik.
Jelenleg forgalomban lévő legfontosabb kártyatípusok
De vajon mennyire elterjedtek az egyes típusok?
Árak
Milyet vegyünk?
Milyen sebességűt?
Mekkora kapacitásút vásároljunk?
A szokásos kérdés: márkásat vagy nem márkásat vegyek?
Speciális kártyák
A cikkben tobb helyen emlegetett RAW formatum:
A felsőbb kategóriás digitális fényképezőgépek többsége lehetővé teszi az érzékelő (CCD vagy CMOS) által rögzített képeket feldolgozás nélkül, nyers (RAW) formátumban történő elmentését. A módszer előnye, hogy a kép sokkal több információt tartalmaz, mint amit a JPEG formátumban le lehet tárolni, így a kép expozíciójának, fehéregyensúlyának és egyéb jellemzőjének állítása, finomhangolása utólag is "büntetés nélkül" elvégezhető. A nyers formátum használatának a hátránya, hogy a képek utólagos feldolgozás nélkül használhatatlanok. A nyers formátumot digitális negatívként is emlegetik.
Monday, May 16, 2005
kepregeny.net
Igy jellemzik magukat:
-Egy oldal mindazoknak akik szeretik a képregényeket, kortól és nemtől függetlenül...
-Egy oldal, ahol lelkes (amatőr) fordítók és beírók egyre népesebb csapata igyekszik igényes tálalásban, magyar nyelven közkinccsé tenni a világ válogatott képregényirodalmát...
-Egy oldal, ahol rábukkanhatunk gyermekkorunk kedvenc képregényeire...
-Egy oldal, ahol hasonló erdeklődésű emberekkel oszthatjuk meg véleményünket, ötleteinket... akár a gondjainkat is...
-Egy oldal, ahol mindig friss információkat kaphatunk erről a hazánkban kissé háttérbe szorult művészeti ágról és az ahhoz kapcsolódó eseményekről, rendezvényekről...
Ebbol nekem a 3. pont tetszett legjobban. Tobbek kozott ilyeneket talaltam:
Asterix
Dr Bubo
Fix es Foxi
Kockas
Lucky Luke
Mezga Csalad
Mozaik
Pif
Pifu
Rejto Sorozat
Tarzan
-Egy oldal mindazoknak akik szeretik a képregényeket, kortól és nemtől függetlenül...
-Egy oldal, ahol lelkes (amatőr) fordítók és beírók egyre népesebb csapata igyekszik igényes tálalásban, magyar nyelven közkinccsé tenni a világ válogatott képregényirodalmát...
-Egy oldal, ahol rábukkanhatunk gyermekkorunk kedvenc képregényeire...
-Egy oldal, ahol hasonló erdeklődésű emberekkel oszthatjuk meg véleményünket, ötleteinket... akár a gondjainkat is...
-Egy oldal, ahol mindig friss információkat kaphatunk erről a hazánkban kissé háttérbe szorult művészeti ágról és az ahhoz kapcsolódó eseményekről, rendezvényekről...
Ebbol nekem a 3. pont tetszett legjobban. Tobbek kozott ilyeneket talaltam:
Asterix
Dr Bubo
Fix es Foxi
Kockas
Lucky Luke
Mezga Csalad
Mozaik
Pif
Pifu
Rejto Sorozat
Tarzan
Friday, May 13, 2005
[MS Word] a PageSetup.PaperSize megvaltoztatasa atallitja a PageSetup.Orientation-t is
Ha kodbol szeretne az ember elfektetni a papirjat es beallitani a papirmeretet is, akkor vigyazni kell a sorrendre, mert a
akkor ugyanugy allo papirja lesz, mintha el se fektette volna. Ezert jobb a forditott sorrend:
Nem hiszem, hogy ez lenne a normalis mukodes. Inkabb valami hibanak tunik. Igy mukodik a 7-es Word-ben es a 11-esben is.
Ezzel a macro-val ki lehet probalni:
PageSetup.PaperSize megvaltoztatasa automatikusan atallitja a PageSetup.Orientation-t wdOrientPortrait-ra (0), tehat ha valaki azt irja, hogy:
doc.Sections(1).PageSetup.Orientation = wdOrientLandscape
doc.Sections(1).PageSetup.PaperSize = wdPaperA4
akkor ugyanugy allo papirja lesz, mintha el se fektette volna. Ezert jobb a forditott sorrend:
doc.Sections(1).PageSetup.PaperSize = wdPaperA4
doc.Sections(1).PageSetup.Orientation = wdOrientLandscape
Nem hiszem, hogy ez lenne a normalis mukodes. Inkabb valami hibanak tunik. Igy mukodik a 7-es Word-ben es a 11-esben is.
Ezzel a macro-val ki lehet probalni:
Sub ChangeOrientation()
Dim doc
Set doc = Documents.Add()
Call MsgBox(doc.Sections(1).PageSetup.Orientation)
doc.Sections(1).PageSetup.Orientation = wdOrientLandscape
Call MsgBox(doc.Sections(1).PageSetup.Orientation)
doc.Sections(1).PageSetup.PaperSize = wdPaperA4
Call MsgBox(doc.Sections(1).PageSetup.Orientation)
End Sub
Wednesday, May 11, 2005
Method Studios
Ok keszitettek az a Powerade reklamot, amiben James dobalja az egeszpalyasokat. Csinaltak egy halom mas dolgot is, amibol sokminden megtekintheto az oldalukon.
Peldaul:
A kosarlabda az ember legjobb baratja.
A kosarlabda nem is olyan jo barat.
Peldaul:
A kosarlabda az ember legjobb baratja.
A kosarlabda nem is olyan jo barat.
Sunday, May 08, 2005
Scott Mitchell: Why I Don't Use DataSets in My ASP.NET Applications
...during my talk I mentioned how I, personally, rarely, if ever, use DataSets in my ASP.NET applications, sticking with the good ol' DataReader instead. Since then I have received a number of emails from attendees asking me why I don't use DataSets. Rather than responding to each questioner individually, I decided to write this article explaining my rationale.
A lenyeg:
Simply put, the DataSet's increased feature set makes it a less performant choice for reading data than the DataReader.
2 forrasra hivatkozik:
- According to A Speed Freak's Guide to Retrieving Data in ADO.NET, the DataReader is roughly thirty times more performant than the DataSet.
- Additional statistics can be found at Performance Comparison: Data Access Techniques, which compares the DataSet and DataReader against a number of common data access scenarios. The end result is that the DataReader is more performant than the DataSet, although this particular article's results do not show as large a performance difference between these two data objects as the Speed Freak article does.
Felteszi a kerdest: When is a DataSet Useful?
Es 2 ilyen lehetoseget hoz fel:
-In a desktop, WinForms application.
-For sending/receiving remote database information or for allowing communication between disparate platforms.
De hozzateszi:
Now, how often are you doing either of these things in your day-to-day ASP.NET development? Hardly ever, I'd wager, which is why you probably shouldn't be using DataSets! While the ASP.NET data Web controls are rather indifferent on what data object you use, you are suffering from a performance loss by choosing to use a DataSet.
A konkluzioja:
In this article we examined the fundamentals of the two data access objects provided by ADO.NET: the DataReader and the DataSet. Both objects have their time and place in .NET applications but, in my opinion, DataSets are rarely, if ever, useful in ASP.NET Web applications. There are exceptions, granted, but for the majority of Web applications, DataReaders should be used exclusively.
A lenyeg:
Simply put, the DataSet's increased feature set makes it a less performant choice for reading data than the DataReader.
2 forrasra hivatkozik:
- According to A Speed Freak's Guide to Retrieving Data in ADO.NET, the DataReader is roughly thirty times more performant than the DataSet.
- Additional statistics can be found at Performance Comparison: Data Access Techniques, which compares the DataSet and DataReader against a number of common data access scenarios. The end result is that the DataReader is more performant than the DataSet, although this particular article's results do not show as large a performance difference between these two data objects as the Speed Freak article does.
Felteszi a kerdest: When is a DataSet Useful?
Es 2 ilyen lehetoseget hoz fel:
-In a desktop, WinForms application.
-For sending/receiving remote database information or for allowing communication between disparate platforms.
De hozzateszi:
Now, how often are you doing either of these things in your day-to-day ASP.NET development? Hardly ever, I'd wager, which is why you probably shouldn't be using DataSets! While the ASP.NET data Web controls are rather indifferent on what data object you use, you are suffering from a performance loss by choosing to use a DataSet.
A konkluzioja:
In this article we examined the fundamentals of the two data access objects provided by ADO.NET: the DataReader and the DataSet. Both objects have their time and place in .NET applications but, in my opinion, DataSets are rarely, if ever, useful in ASP.NET Web applications. There are exceptions, granted, but for the majority of Web applications, DataReaders should be used exclusively.
Sunday, May 01, 2005
153
"Simon Peter went up, and drew the net to land full of great fishes, an hundred and fifty and three: and for all there were so many, yet was not the net broken." (John 21:11)
153 is a neat number. Here are four reasons:
1. 153 = 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17
2. 153 = 1! + 2! + 3! + 4! + 5! (i.e., 1 + (1 x 2) + (1 x 2 x 3) + (1 x 2 x 3 x 4) + (1 x 2 x 3 x 4 x 5))
3. 153 = 13 + 53 + 33
4. 153 lies dormant in every third number. Take any multiple of three, sum the cubes of its digits, take the result, sum the cubes of its digits, take the results, etc. Believe me. You eventually get 153. Take 12, for example.
13 + 23 = 9.
93 = 729.
73 + 23 + 93 = 1080.
13 + 03 + 83 + 03 = 513.
Finally, 53 + 13 + 33 = 153.
forras
153 is a neat number. Here are four reasons:
1. 153 = 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17
2. 153 = 1! + 2! + 3! + 4! + 5! (i.e., 1 + (1 x 2) + (1 x 2 x 3) + (1 x 2 x 3 x 4) + (1 x 2 x 3 x 4 x 5))
3. 153 = 13 + 53 + 33
4. 153 lies dormant in every third number. Take any multiple of three, sum the cubes of its digits, take the result, sum the cubes of its digits, take the results, etc. Believe me. You eventually get 153. Take 12, for example.
13 + 23 = 9.
93 = 729.
73 + 23 + 93 = 1080.
13 + 03 + 83 + 03 = 513.
Finally, 53 + 13 + 33 = 153.
forras
Friendly Numbers
Pythagoras considered 220 and 284 to be friendly (or amicable). He even wrote: "[A friend] is the other I, such as are 220 and 284". Aristotle also used the notion of friendly numbers to characterize friendship (in his work "Ethics"). So what makes the numbers 220 and 284 so special? Their property is that each is equal to the sum of the other's proper divisors. The proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, and 110, and they sum up to 284; the proper divisors of 284 are 1, 2, 4, 71, and 142, and they sum up to 220.
Itt olvashato Ibn Qurra Ibrahim friendly numbers kereso algoritumusa.
Itt olvashato Ibn Qurra Ibrahim friendly numbers kereso algoritumusa.
CuriousMath.com :: Math is an attitude
Want to learn how to quickly square a number that ends in 5? Or how to tell if a number is divisible by 3? Or maybe you'd like to know why the number 153 in the Bible is such an interesting number? That's the kind of fun and fascinating math tricks and trivia you'll find here at CuriousMath.com.
Friday, April 29, 2005
Not Another C# Versus VB Article
This article explains the benefits of a Microsoft .NET application development organization coding in C# versus coding in VB.
Saturday, April 09, 2005
EqWorld - The World of Mathematical Equations
Equations play a crucial role in modern mathematics and form the basis for mathematical modelling of numerous phenomena and processes in science and engineering.
The EqWorld website presents extensive information on solutions to various classes of ordinary differential, partial differential, integral, functional, and other mathematical equations. It also outlines some methods for solving equations, includes interesting articles, gives links to mathematical websites, lists useful handbooks and monographs, and refers to scientific publishers, journals, etc.
The EqWorld website presents extensive information on solutions to various classes of ordinary differential, partial differential, integral, functional, and other mathematical equations. It also outlines some methods for solving equations, includes interesting articles, gives links to mathematical websites, lists useful handbooks and monographs, and refers to scientific publishers, journals, etc.
David Eppstein oldala
Van itt sokminden, peldaul:
Number-Theoretic Hacks: I have implemented a number of simple number-theoretic algorithms for my own amusement, and provide them here on the net.
Combinatorial Game Theory: Combinatorial Game Theory studies strategies and mathematics of two-player games of perfect knowledge such as chess or go (but often either concentrating instead on simpler games such as nim, or solving endgames and other special cases). An important distinction between this subject and classical game theory (a branch of economics) is that game players are assumed to move in sequence rather than simultanously, so there is no point in randomization or other information-hiding strategies.
Geometry in Action: This page collects various areas in which ideas from discrete and computational geometry (meaning mainly low-dimensional Euclidean geometry) meet some real world applications. It contains brief descriptions of those applications and the geometric questions arising from them, as well as pointers to web pages on the applications themselves and on their geometric connections. This is largely organized by application but some major general techniques are also listed as topics.
The Geomety Junkyard: These pages contain usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry. Some of it is quite serious, but I hope much of it is also entertaining.
Number-Theoretic Hacks: I have implemented a number of simple number-theoretic algorithms for my own amusement, and provide them here on the net.
Combinatorial Game Theory: Combinatorial Game Theory studies strategies and mathematics of two-player games of perfect knowledge such as chess or go (but often either concentrating instead on simpler games such as nim, or solving endgames and other special cases). An important distinction between this subject and classical game theory (a branch of economics) is that game players are assumed to move in sequence rather than simultanously, so there is no point in randomization or other information-hiding strategies.
Geometry in Action: This page collects various areas in which ideas from discrete and computational geometry (meaning mainly low-dimensional Euclidean geometry) meet some real world applications. It contains brief descriptions of those applications and the geometric questions arising from them, as well as pointers to web pages on the applications themselves and on their geometric connections. This is largely organized by application but some major general techniques are also listed as topics.
The Geomety Junkyard: These pages contain usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry. Some of it is quite serious, but I hope much of it is also entertaining.
The Galileo Project
The Galileo Project is a source of information on the life and work of Galileo Galilei (1564-1642). Our aim is to provide hypertextual information about Galileo and the science of his time to viewers of all ages and levels of expertise.
KaBol - Knot a Braid of Links
KaBoL is a "cool math site of the week" service to the mathematics community provided within Camel by the Canadian Mathematical Society. Since it was launched in 1996, KaBoL has featured hundreds of valuable math pages.
Kar, hogy utoljara tavaly szeptemberben nyultak hozza, de azert igy is sok mindent lehet talalni.
Kar, hogy utoljara tavaly szeptemberben nyultak hozza, de azert igy is sok mindent lehet talalni.
The Sound of Mathematics
This site has GM MIDI files of algorithmic music determined by mathematics and the musical preferences of a human.
A kedvenceim:
Pascal haromszog
pi
The Omega Constant
Euler phi fuggvenye
Fibonacci sorozat
A kedvenceim:
Pascal haromszog
pi
The Omega Constant
Euler phi fuggvenye
Fibonacci sorozat
The Prime Pages
The Prime Pages: Access to hundreds of pages of award-winning information on prime numbers--with links to thousands of pages elsewhere. We host the searchable database of the 5000 largest known primes (updated weekly). We also have a glossary, top 10 records lists, prime-music, programs, free downloads, and much more!
Friday, April 08, 2005
Tuesday, March 15, 2005
Stopdesign
Stopdesign was founded in 1998 by Douglas Bowman as a small design consultancy. This site is a collection of creative work and shared thinking representing the collaborative problem solving, simple solutions, and cost-effective results Stopdesign produces and delivers for clients and readers around the world.
Monday, March 14, 2005
1848 - stratégiai játék
A www.48.sulinet.hu honlapról elérhető és ingyenesen letölthető játék a Sulinet Digitális Tudásbázison digitális tananyagokkal egészül ki.
Sunday, March 06, 2005
Erich Friedman oldala
A fooldalrol ezekre a helyekre lehet eljutni:
Math Magic is a web site devoted to original mathematical recreations.
Packing Center
Puzzle Palace
Ambigrams
What's Special About This Number?: kulonbozo tudnivalok a szamokrol 0-9999
Periodic Table of Mathematicians
Math Magic is a web site devoted to original mathematical recreations.
Packing Center
Puzzle Palace
Ambigrams
What's Special About This Number?: kulonbozo tudnivalok a szamokrol 0-9999
Periodic Table of Mathematicians
Saturday, March 05, 2005
JefRaskin.com
This is the official site about Jef Raskin, author of The Humane Interface (Addison-Wesley 2000), creator of Apple's Macintosh, the Canon Cat, click-and-drag selection and other inventions. He coined the term and the concept of "information appliances." This site contains works by and about him, including Jef's writings on a variety of subjects. There is also a tediously long curriculum vitae. Lots of dates and references if you need them. Otherwise, skip it.
This site also contains pointers to a current project to implement many of the features and methods described in Jef's recent book. The project, a part of the new Raskin Center for Humane Interfaces, is called "Archy" and will be available for download later this year. This site was designed and is maintained by Galen Panger and Aza Raskin.
This site also contains pointers to a current project to implement many of the features and methods described in Jef's recent book. The project, a part of the new Raskin Center for Humane Interfaces, is called "Archy" and will be available for download later this year. This site was designed and is maintained by Galen Panger and Aza Raskin.
Friday, March 04, 2005
What were Einstein and Gödel talking about?
Egy erdekes cikk a The New Yorker-ben amibol peldaul kiderul, hogy Einsteinnek megtiltota a Sved Akademia, hogy a Nobel dij atvetelekor a relativitaselmeleterol beszeljen, mert azt nem ismertek el, igy o inkabb Stockholm helyett Goteborgban tartotta koszonobeszedet, ahol a relativitas irant erdeklodo V. Gustav kiraly az elso sorban ulve hallgatta.
Azt is megtudhatjuk, hogy Godel olyan alaposan felkeszult az alkotmanybol a amerikai allampolgarsagi tesztjere, hogy az ertekelo hivatalnoknak be akarta bizonyitani, hogy az alkotmanyukban levo kovetkezetlenseg lehetove teszi egy diktator felemelkedeset. A szobaban Einsetein es Oskar Morgenstern fogtak vissza, nehogy kitoloncolas legyen a vege.
Az is kiderul, hogy nem csak a fiatalsaguk volt tele nehezseggel, de utolso eveikre ismet bekemenyedett az eletuk.
A 3 konyv, aminek tulajdonkeppen az ismertetoje a fenti cikk:
John S. Rigden: Einstein 1905: The Standard of Greatness
Rebecca Goldstein: Incompleteness: The Proof and Paradox of Kurt Godel (Great Discoveries)
Palle Yourgrau: A World Without Time: The Forgotten Legacy Of Godel And Einstein
Azt is megtudhatjuk, hogy Godel olyan alaposan felkeszult az alkotmanybol a amerikai allampolgarsagi tesztjere, hogy az ertekelo hivatalnoknak be akarta bizonyitani, hogy az alkotmanyukban levo kovetkezetlenseg lehetove teszi egy diktator felemelkedeset. A szobaban Einsetein es Oskar Morgenstern fogtak vissza, nehogy kitoloncolas legyen a vege.
Az is kiderul, hogy nem csak a fiatalsaguk volt tele nehezseggel, de utolso eveikre ismet bekemenyedett az eletuk.
A 3 konyv, aminek tulajdonkeppen az ismertetoje a fenti cikk:
John S. Rigden: Einstein 1905: The Standard of Greatness
Rebecca Goldstein: Incompleteness: The Proof and Paradox of Kurt Godel (Great Discoveries)
Palle Yourgrau: A World Without Time: The Forgotten Legacy Of Godel And Einstein
Subscribe to:
Posts (Atom)