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Sun Aug 15 04:06:31 HKT 2010
From /weblog/astronomical
這是天體力學的書籍？http:[..]s/pdfs/123.NaturePhyscis2009_Dentcho.pdf 發表於 2010-1-19 01:02 | 只看該作者 這不是書, 是份是 paper 來架。裏面所講的內容其實都幾深, 暫時來說應該不太適合你的程度。 睇Paper 其實都幾辛苦的, 因為那是專家寫給專家看的, 裏面的內容很多時都精簡。有時候要弄清楚一份 paper 寫些什麼 , 往往需要看埋其他相關的 papers 才看得明． 假如你連 Abstract 都看不知其大意的話, 建議你不要花時間看下去了，因為那會令你越看越迷失方向． 萬物逆旅天地客，洞悉枯榮自悠然。 發表於 2010-1-19 10:38 | 只看該作者 阿香, Alan Chu 和 彭祿勝他們對這個題目比我認識多很多, 不如你問他們 la. 萬物逆旅天地客，洞悉枯榮自悠然。 雖然我學過天體力學，它不是我的主修科，planetary science 才是。 未習天體力學之前，建議你先看一些中學程度 (不用微積分) 的天文數理書，然後才習天體力學，如果你沒有天文物理打底，你只是玩純綷數學遊戲而非天文學 ! 很久前我看過的讀物有： 1. Mathematical Astronomy for Amateurs, E. A. Beet (不用微積分) http://www.amazon.com/Math-Astro-Amat-Beet-E/dp/0393333426 2. Foundations of Astronomy, W. M. Smart (不用微積分) http://www.amazon.co.uk[..]ations-Astronomy-W-M-Smart/dp/0582446198 3. 行星際的旅行，蘇俄別箂利曼原著，國內符其珣譯 (不用微積分) http://book.kongfz.com/1036/50482817/ 4. Space Mathematics at NASA (不用微積分，推介給中學生) http://spacemath.gsfc.nasa.gov/ 5. NASA Space Mathematics, earlier version (不用微積分) http://er.jsc.nasa.gov/SEH/math.html 6. Adventures In Celestial Mechanics, V. G. Szebehely (入門書，初級微分程度) http://www.amazon.com[..]Mechanics-Victor-Szebehely/dp/0471133175 7. Solar System Dynamics, Murray & Dermott (天體力學專書，全用微積分) http://www.amazon.com[..]ystem-Dynamics-Carl-Murray/dp/0521575974 你仍是中學生，或者你選 No. 1, 4+5, 6 作為開始，其中以 No. 4+5 最淺但最有通識性，又不用買書，No. 1 次之，消化了 No. 6 才算初入天體力學之竅門。千祈不要拔苖助長，夾硬黎重衰。 Alan 發表於 2010-1-19 17:40 | 只看該作者 其實我也略懂微積分，淺顯的微積分還能應付，謝謝AC的指教 發表於 2010-1-19 17:46 | 只看該作者 我在Google圖書館找到了Adventures In Celestial Mechanics的上試閱本 http://books.google.com.hk[..]m=1&ved=0CAkQ6AEwAA#v=onepage&q=&f=false Hi, These books may be more up to date: http://www.springer.com[..]actical+astronomy/book/978-3-642-10529-6 http://www.springer.com/astronomy/book/978-3-540-40750-8 http://www.springer.com/astronomy/book/978-3-540-34143-7 http://www.springer.com/astronomy/book/978-3-540-58963-1 http://www.springer.com/astronomy/book/978-3-540-60355-9 From - http://forum.hkas.org.hk[..]rect.php?tid=3775&goto=lastpost#lastpost
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Sat Aug 14 22:55:10 HKT 2010
From /weblog/finance
whats the cheapest available historic data for fx and commodity futures? - http://www.linkedin.com[..]ML_anet_qa_ttle-dnhOon0JumNFomgJt7dBpSBA
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Fri Aug 06 01:17:44 HKT 2010
From /weblog/unix
How to use "~" - http://www.thegeekstuff.com/2010/06/bash-tilde-expansion use rlwrap to enable BASH like editing in SQLplus, and use screen to presist terminal sessions - http://binkley.blogspot.com[..]miracle-utilities-rlwrap-and-screen.html Ctrl+r searches through history Use the history command plus !# to run old commands Shell expansion using {} , e.g. cp foo.sh{,.old} == cp foo.sh foo.sh.old zsh have good auto complete http://www.pgrs.net/2007/9/6/useful-unix-tricks mkdir -p creates nested directories Use less instead of tail lsof shows open files ps will show process trees with the f flag http://www.pgrs.net/2007/10/8/useful-unix-tricks-part-2 !! is the previous command in the shell history Use vim -b to show nonprintable characters ** is a recursive wildcard in zsh cd – will return to the previous folder Use ctrl+z and kill %1 to kill a process that will not die pwdx shows the working directory of a process Use sh -x to debug shell scripts sysctl replaces /proc on macs http://pgrs.net/2009/2/20/useful-unix-tricks-part-3 ps -eo pcpu,pid,args | sort -n => check CPU% grep -sq "" /etc/lsb-release && lsb_release -rd => run command if file exist More about ps and free - http://www.thegeekstuff.com/2010/07/3-shell-scripts/ HTML tools for commandline - http://www.macdevcenter.com/lpt/a/6343 Bash history - http://www.talug.org/events/20030709/cmdline_history.html
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Fri Aug 06 00:54:21 HKT 2010
From /weblog/unix/script
How to use eval, hash, readonly, shift, getopts, set, unset, let and shopt - http://www.thegeekstuff.com/2010/08/bash-shell-builtin-commands Sample bash completion SSH_COMPLETE=( $(cut -f1 -d' ' ~/.ssh/known_hosts |\ tr ',' '\n' |\ sort -u |\ grep -e '[:alpha:]') ) complete -o default -W "${SSH_COMPLETE[*]}" ssh http://kasparov.skife.org/blog/stuff/starting-a-meme.html Check history statistic - brianm@binky:~$ history | awk {'print $2'} | sort | uniq -c | sort -k1 -rn | head 164 svn 52 cd 42 ssh 32 sudo 22 git 16 ls 16 for 14 echo 13 man 10 curl brianm@binky:~$ http://bluebones.net/2008/04/history-meme/
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Sun Jul 25 13:54:20 HKT 2010
From /weblog/quote
* "Opportunity is missed by most people because it is dressed in overalls and looks like work." - Thomas Edison. * "The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane." - Nikola Tesla * "Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus." - Alexander Graham Bell * "A problem well stated is a problem half-solved." - Charles Kettering * "The best thinking has been done in solitude. The worst has been done in turmoil." - Thomas Edison * "There is nothing in a caterpillar that tells you it's going to be a butterfly." - R. Buckminster Fuller * "A successful person isn't necessarily better than her less successful peers at solving problems; her pattern-recognition facilities have just learned what problems are worth solving." - Ray Kurzweil * "It doesn't matter if you try and try and try again, and fail. It does matter if you try and fail, and fail to try again." - Charles Kettering * "What we do during our working hours determines what we have; what we do in our leisure hours determines what we are." - George Eastman * "God, to me, it seems, is a verb not a noun, proper or improper." - R. Buckminster Fuller * "Everything comes to him who hustles while he waits." - Thomas Edison * "When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us." - Alexander Graham Bell * "We often say that the biggest job we have is to teach a newly hired employee to fail intelligently... to experiment over and over again and to keep on trying and failing until he learns what will work." - Charles Kettering http://traderfeed.blogspot.com[..]/life-insights-from-great-inventors.html
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Sat Jul 24 15:58:59 HKT 2010
From /weblog/trip
Top 10 ultimate places to see wildlife - Belize Bolivia Botswana Great Barrier Reef, Australia Costa Rica Everglades, USA Kenya Galápagos Islands, Ecuador Madagascar Malaysian Borneo http://www.lonelyplanet.com[..]-tips-and-articles/42/57576?affil=fb-fan
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Tue Jun 01 22:55:17 HKT 2010
From /weblog/unix
Seven habits of effective text editing , a lot of nice tip of using vim, like hlsearch , omni-completion http://www.moolenaar.net/habits.pdf http://video.google.com/videoplay?docid=2538831956647446078 Very nice vim plugin - http://www.vim.org/scripts/script.php?script_id=479 vimdiff tips - http://blog.objectmentor.com[..]cles/2008/04/30/vim-as-a-diff-merge-tool http://gcody.blog.ccidnet.com[..]9899-uid-36931-do-showone-type-blog.html How to regex with line number - http://vim.wikia.com/wiki/Insert_line_numbers_2 cheat sheet of jumping around source code - http://www.faqs.org[..]inux-HOWTO/C-editing-with-VIM-HOWTO.html Nice analysis of good programming environment - http://www.benrady.com[..]why-i-switched-from-textmate-to-vim.html Creating macros in vim - http://smartic.us/2010/02/03/creating-macros-in-vim Some VIM tips: Essential Vim editor navigation commands Vim search and replace – 12 powerful find and replace examples. How To add bookmarks inside the Vim editor How To record and play inside the Vim editor Correct spelling mistakes automatically inside the Vim Editor Automatic word completion using Ctrl-X Enable thesaurus option in the Vim editor Vim autocommand magic. Add custom header to your files automatically. Convert Vim editor to a beautiful source code browser. Use the Vim editor as a bash IDE, or C/C++ IDE, or Perl IDE. http://www.thegeekstuff.com/2010/04/vim-editor-tutorial/ ctrl+w, ctrl+w , vimdiff switch folder - hack2live.blogspot.com/2009/02/vimdiff-shortcut-keys.html
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Sun May 30 20:32:36 HKT 2010
From /weblog/software_engineering/project
Only the programmer who is going to write the code can schedule it. Any system where management writes a schedule and hands it off to programmers is doomed to fail. Only the programmer who is going to do the work can figure out what steps they will need to take to implement that feature. - http://www.joelonsoftware.com/articles/fog0000000245.html Never, ever let managers tell programmers to reduce an estimate. Many rookie software managers think that they can "motivate" their programmers to work faster by giving them nice, "tight" (unrealistically short) schedules. I think this kind of motivation is brain-dead. - http://www.joelonsoftware.com/articles/fog0000000245.html Micromanagement or Macromanagement? http://boncey.org/2006_10_29_how_to_mentor_programmers But, unfortunately, as a general rule, Project Managers have no training. Even if they do have training in the form of an MBA, MBA education is impractical and useless; the academic community has completely failed us in this respect. Furthermore, Project Managers are more often based on personal friendships and company politics; they are rarely based on management skill. And, finally, most managers do not acknowledge that management is a skill that they must study and learn so they don't study or learn it. http://discuss.joelonsoftware.com[..]DiscussTopicParent=8469&ixDiscussGroup=5 An explanation of agile, I think it is more about project management - http://blog.objectmentor.com/articles/2007/04/23/short-reach Some common problem of software project management - http://ajaxwidgets.com[..]thomas/9_reasons_why_software_project.bb http://ntschutta.com[..]ou-know-your-project-is-in-trouble-when/ http://www.goodproductmanager.com[..]roduct-management-vs-project-management/ Brief description of thoughtworks codejam - http://blog.nona.name/200804274.html Listen first. Measure later. http://digerati-illuminatus.blogspot.com[..]gspot.com/2008/05/measure-or-listen.html Paper of burn up and burn down - http://alistair.cockburn.us/Earned-value+and+burn+charts Per my understanding, we can say burn down is push by management where DEV work as task consumer and completing per define tasks within limited time; where burn up work in the other way round. Why rewrite usually bad - http://www.jroller.com[..]astianKuebeck/entry/why_version_2_0_will Why need to manage user/client - http://dreamhead.blogbus.com/logs/48408290.html The blog list several software projects fail case study - http://www.codinghorror.com/blog/archives/000588.html The law of late project - http://www.commonsense4commonpeople.net[..]et/2009/11/the-law-of-late-projects.html Friendship, what make one big team working - http://blog.objectmentor.com/articles/2010/04/26/pair-management
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Mon May 17 22:21:13 HKT 2010
From /weblog/software_engineering
1: Review often 2: Review informal and short 3: Review with difference people 4: Keep it positive 5: Enjoy it http://www.makinggoodsoftware.com[..]/08/06/5-tips-to-make-good-code-reviews/
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Fri Apr 30 01:40:27 HKT 2010
From /weblog/misc
A detailed overview of POP, IMAP and GMAIL - http://www.macdevcenter.com/lpt/a/6702 The 12 steps to cure e-mail addiction - Admit that e-mail is managing you. Let go of your need to check e-mail every ten minutes.
- Commit to keeping your inbox empty.
- Create files where you can put inbox material that needs to be acted on.
- Make broad headings for your filing system so that you have to spend less time looking for filed material.
- Deal immediately with any e-mail that can be handled in two minutes or less but create a file for mails that will take longer.
- Set a target date to empty your in box. Don't spend more than an hour at a time doing it.
- Turn off automatic send/receive.
- Establish regular times to review your e-mail.
- Involve others in conquering your addiction.
- Reduce the amount of e-mail you receive.
- Save time by using only one subject per e-mail; delete extra comments from forwarded e-mail, and make the subject line detailed.
- Celebrate taking a new approach to e-mail.
I think 5 and 6 is useful... http://www.cnn.com[..]20/email.addiction.steps.reut/index.html How to control emails? - http://www.russellbeattie.com/notebook/1008869.html
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Sat Apr 24 03:05:45 HKT 2010
From /weblog/learning
#1 – Pegging (or How Mental Magicians can Perfectly Recall Hundreds of Numbers) #2 – Metaphor (Juliet is the sun… or is she a chemical formula?) #3 – Total Immersion (Or How a Guy Can Become Fluent in 8 Languages) #4 – Visceralization (What does a derivative look like?) #5 – Linking (Or How to Remember a Grocery List Without the Paper) #6 – The 5-Year Old Method (Try explaining quantum physics to a first grader) #7 – Ambiance Catalysts (Or How Drinking a Pint Can Improve Your Studying) #8 – Diagrams (Who said doodling in class was wrong?) #9 – Speed Reading (Or How to Read 70 Books in a Year) http://www.scotthyoung.com[..]ng-that-most-people-have-never-heard-of/
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