跳到主要內容

TED d3 What is entropy? - Jeff Phillips



熵[編輯]

維基百科，自由的百科全書
本條目介紹的是熱力學的熵。關於資訊理論的熵，請見「熵 (資訊理論)」。關於生態學的熵，請見「熵 (生態學)」。關於其他用法，請見「熵 (消歧義)」。

熔冰——増熵的古典例子[1]1862年被魯道夫·克勞修斯描寫為冰塊中分子分散性的増加[2]
化學及熱力學中所指的熵（英語：Entropy）[3]，是一種測量在動力學方面不能做功的能量總數，也就是當總體的熵增加，其做功能力也下降，熵的量度正是能量退化的指標。熵亦被用於計算一個系統中的失序現象，也就是計算該系統混亂的程度。熵是一個描述系統狀態的函數，但是經常用熵的參考值和變化量進行分析比較，它在控制論、機率論、數論、天體物理、生命科學等領域都有重要應用，在不同的學科中也有引申出的更為具體的定義，是各領域十分重要的參量。

標籤：

留言

張貼留言

這個網誌中的熱門文章

collection view part6 swift

preselect collectionview https://stackoverflow.com/questions/45610785/how-to-preselect-and-highlight-a-cell-from-a-uicollectionview https://hackernoon.com/uicollectionviewcell-selection-made-easy-41dae148379d if collectionview allow multiple selection remeber add this, cell item could be Deselect collectionView. selectItem (at: indexPath, animated: true , scrollPosition: . top ) https://stackoverflow.com/questions/15330844/uicollectionview-select-and-deselect-issue save indexpath userdefault https://stackoverflow.com/questions/34804294/how-to-save-nsindexpath-locally https://stackoverflow.com/questions/37001643/how-to-add-nsindexpath-to-nsuserdefaults-in-swift navigation presneted viewcontroller dismiss https://stackoverflow.com/questions/31205002/why-is-it-bad-practice-to-have-a-viewcontroller-dismiss-itself indexpath comparison         if selectIndexPath . contains (indexPath) {             cell. isSelect...
張貼留言
閱讀完整內容

collection view part3 swift

make random color for test, i put in cell background color watch diff https://stackoverflow.com/questions/29779128/how-to-make-a-random-color-with-swift because use CYlayer, i have to remove layer https://stackoverflow.com/questions/10789766/remove-all-sublayers-from-a-view https://stackoverflow.com/questions/37581951/ios-how-to-remove-previously-added-sublayers-of-a-uiview/37581988 alpha gradint with imageview https://stackoverflow.com/questions/11807876/transparent-alpha-gradient-with-core-graphic-iphone swift map and flatmap http://swiftcafe.io/2016/03/28/about-map/ get local date and time https://stackoverflow.com/questions/28404154/swift-get-local-date-and-time swift dictionary basic https://stackoverflow.com/questions/27313242/how-to-append-elements-into-dictionary-in-swift add 1 day to NSDate https://stackoverflow.com/questions/5067785/how-do-i-add-1-day-to-an-nsdate get keys from dictionay https://stackoverflow.com/questions/26386093/array-from-dictionary...
張貼留言
閱讀完整內容

js30 d27 drag跑馬燈

https://github.com/richardhsieh18/js30/tree/master/course27 CSS transform: scale(0.98);  =>  transform: scale(1); js     isDown = true;     slider.classList.add('active');     startX = e.pageX - slider.offsetLeft;     scrollLeft = slider.scrollLeft;   });     if(!isDown) return; //stop the function from running     e.preventDefault();     const x = e.pageX - slider.offsetLeft;     const walk = (x - startX) * 3;     slider.scrollLeft = scrollLeft - walk;   });
張貼留言
閱讀完整內容