【latex版】水贴

三星已在官方博客上宣布已开始在南韩测试旗下的 Samsung Pay，不过能够试用的幸运儿就只有被选中的少数 Galaxy S6 和 S6 Edge 用户，据指有 1,000 人。跟 Apple Pay 比较的话，Samsung Pay 除了也可以经 NFC 付款之外，更能够利用收购 LoopPay 所带来的「magnetic secure transmission（MST）」技术，而得以在大部份零售店的终端机上付款；过往的报导指支持的零售店有 9 成之多。

就在不久前，英特尔正式对外宣布，其下代的 Cannonlake 芯片将会推迟半年发布。这也就意味着，他们近年来连续第二次没赶上摩尔定律的两年周期，去年在 14nm 制程 Broadwell 产品上发生的事情，再过不久又将重演一遍了（其实再之前的 Haswell 和 Ivy Bridge 就已经不准时了）。按照官方说法，导致这一结果的原因，是 10nm 芯片所需要的微型晶体管，生产起来实在太过复杂。

我们一般消费者大概不太会考虑全强固型的笔记本，但如果你是属于那种真的要求不论什么状况笔记本都要能挺着的使用者，符合军规的全强固笔记本在市面上的选择并不算多。松下大概是业界最有名的一间全强固笔记本制造商，但产品并不容易买到；此外在市面上的大多是一些专做全强固笔记本的小厂商。相对来说，Dell 占有容易购买，以及长时间企业和专业用途的支持的优势。 今天发布的机种一共有 14 吋和 12 吋两个款式，其中 12 吋的配备有翻转屏幕。

Justice secretary signals start of programme of selling off ‘ageing and ineffective Victorian prisons in our major cities’ to fund more modern jails

Michael Gove has vowed to close down “ageing and ineffective” Victorian jails and sell off their sites to fund new buildings to replace them, in his first major speech on prisons policy.

The justice secretary firmly put north London’s Pentonville prison in the frame for the first major closure and sell-off under a “new for old” prisons policy by citing it as the “most conspicuous” and “most dramatic example of failure within the prison estate”.

The robbing of Nosferatu director FW Murnau’s grave may have had occult motives. But as with Goya or Beethoven, it’s probably just extreme autograph hunting
The cemetery workers who discovered this week that the skull of the great film director FW Murnau had gone missing were not the first to stumble on the theft of a famous person’s head, and probably won’t be the last. Murnau, best known for his horror masterpiece Nosferatu and the Academy-award winning Sunrise, has been dead for more than 70 years, but this didn’t stop persons unknown from digging up his remains and making off with his head. It was not, cemetery officials said, the first time his grave has been disturbed.

The police appear to have few clues as to the identity or motives of the thieves, but one tantalising detail – the discovery of wax residue at the site – may suggest “occult motives”. It’s certainly possible; in the autumn of 2014, a cache of 21 skulls were found under a bridge in the eastern Indian state of Orissa, having been stolen from graveyards for use in black magic. But participants in such rituals aren’t usually picky about whose skull gets used, so the fact that the graves next to Murnau’s went undisturbed leaves open the possibility that something else might be going on here.

It’s good for books so why are so many publishers hostile to the online giant?

The 20th birthday of Amazon this week should, in my view, be a cause for celebration in the book world. Amazon has made more books available, more cheaply, than ever before. It kick-started the ebook revolution. It has enabled aspiring authors, who until recently might have been ripped off by vanity presses, to publish their books at little expense, or even for nothing. It has a website that is a pleasure to use, and it offers outstanding customer service. Yet in certain quarters Amazon is seen as the nastiest, most threatening company since the heyday of Microsoft.

Romanian music event teams up with blood transfusion centre in bid to fight country’s shortage of blood donations

Two tickets for the Transylvania music festival? That’ll be two pints of blood, please. It may sound like a bad episode of Scooby Doo, but organisers of the Untold festival in northern Romania are offering festivalgoers discounts if they donate blood before buying tickets.

Romania ranks second to last in Europe regarding the number of active blood donors, according to data from the National Institute of Blood Transfusion, with only 1.7% of the population donating blood, and most only after someone close to them needed a transfusion.

母体：
$$\mathrm{\rho}=\begin{bmatrix}
     1 & \rho_{12}& \cdots & \rho_{1q} \\
     \rho_{21} & 1& \cdots & \rho_{2q}  \\
     \rho^2_1 & \rho_{12}& \cdots & 1
\end{bmatrix}$$
其中：
$$\rho_{ij}=\frac{\sigma_{ij}}{\sigma_1 \sigma_2}$$
样本：

$$R=D^{- {1\over 2}}SD^{1\over2}$$
其中：
$$D^{1\over2}=diag\{1/s_1,1/s_2,\cdots,1/s_q\}$$

\[母体： $$\mathrm{\rho}=\begin{bmatrix}      1 & \rho_{12}& \cdots & \rho_{1q} \\      \rho_{21} & 1& \cdots & \rho_{2q}  \\      \rho^2_1 & \rho_{12}& \cdots & 1  \end{bmatrix}$$ 其中： $$\rho_{ij}=\frac{\sigma_{ij}}{\sigma_1 \sigma_2}$$ 样本：  $$R=D^{- {1\over 2}}SD^{1\over2}$$ 其中： $$D^{1\over2}=diag\{1/s_1,1/s_2,\cdots,1/s_q\}$$\]

##相关系数

母体：
$$\mathrm{\rho}=\begin{bmatrix}
     1 & \rho_{12}& \cdots & \rho_{1q} \\
     \rho_{21} & 1& \cdots & \rho_{2q}  \\
     \rho^2_1 & \rho_{12}& \cdots & 1
\end{bmatrix}$$
其中：
$$\rho_{ij}=\frac{\sigma_{ij}}{\sigma_1 \sigma_2}$$
样本：

$$R=D^{- {1\over 2}}SD^{1\over2}$$
其中：
$$D^{1\over2}=diag\{1/s_1,1/s_2,\cdots,1/s_q\}$$