Sunday, May 22, 2016

光学倍率 - 维基百科,自由的百科全书

光学倍率 - 维基百科,自由的百科全书

光学倍率折光率屈光率)是透镜曲面镜汇聚或发散光线的程度,它与设备的焦距是负相关的。屈光度是测量光学倍率最常用的单位,国际单位制的单位是反米(m-1)。

将2个或更多个薄透镜组合在一起,组合透镜的光学倍率是接近各别透镜的总和或是更好。光学倍率通常在几何光学的光线追踪或是眼科学中用于描述透镜的特性。

眼睛的折光率太高或是太低,就不能将光线正确的汇聚在视网膜焦点上而产生折射错误近视眼有着过高的光学倍率,因此光在视网膜的前方聚集(也就是说透镜的焦距太短)。反过来说,远视眼是光学倍率太低,因此当眼睛在放松状态时,光线汇聚在视网膜的后方(相当于透镜的焦距太长)。眼睛的折光率在不同的平面上各自不同就称为散光散光是一只眼睛的折射率与其他部位不同的现象。


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Friday, May 20, 2016

How To Maximize Your Income From Display Ads – With Nathan Putnam - sovrn

How To Maximize Your Income From Display Ads – With Nathan Putnam - sovrn

  • Are ads good for every blog? What kinds of blogs are good for running ads?
  • Ads drive people away from your blog. At what point is it justified to do so?
  • What are the important numbers that I need to pay attention to and how do I use them to make the right decisions?
  • If I'm simply using Google Adsense on my blog, am I leaving money on the table? How so?
  • Where are the best positions to place ads on a blog?
  • How do I better manage my ads to make more money?

He also defined for us some technical terms related to adHow To Maximize Your Income From Display Ads placements:

  • Ad Exchange
  • Cost Per Mille (CPM)
  • Effective Cost Per Mille (eCPM)
  • Revenue Per Mille (RPM)
  • Cost Per Click (CPC)
  • Cost Per Acquisition (CPA)
  • Real-Time Bidding (RTB)
  • Programmatic

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Monday, May 16, 2016

Best CPM Publisher Networks– Make Money From Each Page Impression

Best CPM Publisher Networks– Make Money From Each Page Impression

Are you searching for some solid methods to make money from your site? You can try Cost Per Mille publisher networks.

CPM is short for cost per thousand (mille). In CPM networks, publishers earn from every 1,000 ad impressions.


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Monday, May 2, 2016

《hello, 早餐》读书笔记 (评论: hello,早餐)

《hello, 早餐》读书笔记 (评论: hello,早餐)

2015-09-17 21:09:10   来自: Cyn (唯有爱与美食不可辜负。)
hello,早餐的评论 4 star rating4 star rating4 star rating4 star rating 4
提示: 有关键情节透露



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Ten tips to make Google Chrome faster and reduce how much RAM it uses | ZDNet

Ten tips to make Google Chrome faster and reduce how much RAM it uses | ZDNet

#7: Run with the default theme

You can do a lot of customizing of Google Chrome, including changing the theme. However, themes eat RAM, so if you want the speediest possible browser, run with the default theme.

Type chrome://settings and under Appearance, if the Reset to default theme button isn't greyed out then you're running a custom theme. Click the button to go back to the default.

#8: Smoother scrolling

Type chrome://flags into the address bar and find Enable fast tab/windows close. This option speeds up Chrome by allowing it to close windows separate to any JavaScript code that might be running.

After you've made changes click the RELAUNCH NOW button at the bottom of the screen to apply the setting.

Note that this is an experimental feature and be sure to read the warnings at the top of the settings page in Chrome. To undo any changes click the Reset all to default button.


Read full article from Ten tips to make Google Chrome faster and reduce how much RAM it uses | ZDNet