24 May 04:40

Comic: the empire strikes back

New Comic: the empire strikes back
25 May 14:48

Saturday Morning Breakfast Cereal - Programmable Matter

by admin@smbc-comics.com

Hovertext: Is there a Moore's law for bleakness?


New comic!
Today's News:

In which Luke Prince shows how festival-goers can be modeled as slime mold. 

24 May 11:34

Porous Au–Ag Nanospheres with High-Density and Highly Accessible Hotspots for SERS Analysis

by Kai Liu, Yaocai Bai, Lei Zhang, Zhongbo Yang, Qikui Fan, Haoquan Zheng, Yadong Yin and Chuanbo Gao

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.6b00868
26 May 05:48

Towel Day

24 May 15:00

5 Hidden Windows 10 Features You Should Use

by David Nield on Field Guide, shared by Adam Clark Estes to Gizmodo

Windows 10 has officially been with us for close to a year now , but even if you’ve spent a lot of time with the OS since its launch, you may not have found everything it has to offer. Here are five of our favorite hidden features that we’ve discovered over the course of the last year, and why you might want to start using of them.

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24 May 20:17

Controlled Sculpture of Black Phosphorus Nanoribbons

by Paul Masih Das, Gopinath Danda, Andrew Cupo, William M. Parkin, Liangbo Liang, Neerav Kharche, Xi Ling, Shengxi Huang, Mildred S. Dresselhaus, Vincent Meunier and Marija Drndić

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.6b02435
24 May 01:34

SSSS page 528

Page 528 is up!
25 May 11:51

[what if]第149期:披萨外送鸟

by xkcd

本文作者:xkcd

提问:

我男票最近搭乘了一般有机载Wifi的航班,当飞机还在天上飞的时候,他可怜巴巴地问我能不能给他送一份披萨。我开玩笑地给他发了一张嘴里叼着一片披萨的鹦鹉的照片作为回应。很显然我男票要等到飞机降落在纽约肯尼迪机场以后才有可能吃到披萨。那么问题来了:有没有什么鸟能够带得动一个20寸纽约风格的芝士披萨?如果有的话,是哪种鸟呢?

——Tina Nguyen

回答:

一只鸟可能可以把披萨送到某一户人家那里,但要它送到一架正在飞行的飞机上就有些困难了。

setup

(图片致谢:多米诺披萨外送追踪器)

一个20寸的披萨大约有1.8千克重。[1]这相当于麻雀体重的大约100倍,所以我们显然需要一只体型大一些的鸟。这世上长得比披萨大的鸟多了去了,比如老鹰、天鹅、鹤类、鹈鹕以及信天翁。不过,这其中一些鸟儿比剩下的其它鸟儿更胜任送比萨这活,因为它们有着更加合适的翼型。

wingtypes

(是那种装备核武器并且长相吓人的猎鹰哦)

不同的鸟类有着不同形状的翅膀,这主要取决于它们不同的飞行所需。在所有的形状中,最适合运送披萨的应该莫过于比较宽,翼展较短的那种,在很多种鹰的身上你都能见到这种形状的翅膀。[2][3]它们很适合在携带着很重的物品的情况下从地面飞起来,显然这一点是送披萨所必须的。

生活在北美[4]体型最大的猛禽是白头鹰[5]和金鹰,它们成年后能够长到4至5千克重。你在网上看到过的那段金鹰抓走一个小孩的著名视频其实是伪造的,但是确实有人目击过老鹰抓举着很重的东西飞行。去年,摄像师Alex Lamine就曾在佐治亚州看到过一只白头鹰抓举着一根12磅(5.4千克)重的树枝,可能是用来建造其巨型鸟巢所用。那只白头鹰在飞回巢穴之前就把树枝给扔了,但这至少证明了鸟类有能力(至少可以短时间内)携带着等同于自身体重的物体飞行。

一般来说,猛禽不会去尝试举起超过其体重一半的物体。这意味着一只500克重的游隼没法提起我们那个2千克重的披萨,而一只5千克重的鹰倒是有可能。

pickup

(这里提供一些神奇的馅料)

不过等等,能不能把披萨举起来是一回事,你要怎么让它把披萨送到飞机上呢?

像鹰和雕这样的鸟类能够顺着热气流[7]飞到很高的地方。在热带地区,充沛的阳光能够产生强劲的热气流,曾经有飞行员在超过1万米高空看到过黑白秃鹫的踪迹[8]。这个高度足够够得着巡航中的客机,但这需要有完美的飞行条件才能达到,而绑着一个披萨飞行可不满足这个条件。

所以鸟可能可以抓着一个披萨飞行,但它没法带着披萨飞到飞机的巡航高度,而且别忘了你还必须解决另一个问题:速度。

先不管鸟类能不能飞到客机的巡航高度,光是飞机的巡航速度就没有一种鸟类赶得上。即使客机上的某个人在飞行途中成功打开了紧急出口的舱门,他也要想办法把披萨从鸟身上取下并拿回机舱。

如果装披萨的盒子倾斜地太厉害的话,披萨上的芝士就会全部流到一边去。不同的披萨有不同的临界角度,而且很大程度上还取决于披萨的温度,不过我们这里假设临界角度是45度。于是这相当于披萨可以承受最大1g的水平加速度[9]。要想以这个速度加速到客机的巡航速度500英里/时,我们需要超过1英里的加速距离。换言之,我们需要在飞机尾部拖一根1英里长的回收装置来接收披萨。

mechanism

(滚出我的飞机!弄一个披萨再回来!)

但等等,刚刚的计算基于的是横向加速度,而披萨像人一样更适合于承受竖向加速度(即面部朝向的方向)。如果在交接过程中披萨能够旋转的话,它所能承受的加速度会变得更大,这样我们的回收装置就能缩小一些。

那么披萨能够承受多大的竖向加速度而不至于被压扁成一张大饼呢?我也不知道,因为我找不到相关的数据。如果有人有意愿用离心机甩披萨的话,尽管去吧,别忘了拍照片!

总的来说,如果你在飞机上又急着想吃披萨的话,或许你该等到飞机降落后再叫一个披萨外卖。而且如果你想的话,可以让店里派一只鸟给你送来。

eagle

(惊爆:得知白头鹰会把披萨卷起来吃掉后,美国政府撤回了一切与白头鹰的谈判努力)

不过当你打开盒子发现披萨少了几片的时候,请不要一脸懵逼……

注释

[1] 引用:我刚才还真点了一个披萨来验证。通常来说写这种文章的时候我会避免真枪实弹地去干,不过如果能够借机吃上好几个披萨的话,我不介意破一次例。

[2] 像海鸥或者信天翁这样又长又扁的翅膀在气动效率上很占优势,不过坏处是扇动翅膀比较费力,因而这些鸟就很难迅速加速。比如说信天翁在飞起来之前需要挺长的一段“跑道”来助跑。

[3] 这里有栖息在夏威夷的一些信天翁雏鸟的实时视频。

[4] 这里没有算上加州秃鹫,因为它们不太会大力扇动翅膀,因而也就无法提升重物。除此而外,全世界一共就只有几百只加州秃鹫——20世纪90年代早期才22只——所以一旦你拿了其中几只去送披萨外卖的话,一定会有人注意到的。

[5] 这里有一只在美国国家植物园筑巢的白头鹰的实时视频。

[6] 这里是亚利桑那州一只游隼巢穴的实时视频。

[7] 热气流是温暖的柱状上升气流,滑翔机飞行员和《动物变形人》(Animorphs)系列丛书的粉丝们一定不会对它陌生。

[8] :(

[9] 这里还要假设你能在这种高度下保证披萨是温的,因为哪家外卖会送冷掉的披萨啊?

关于

原作:http://xkcd.com/

编译:猪的米

xkcd及衍生系列What if系列:http://songshuhui.net/archives/author/xkcd

在漫画原作上以鼠标悬停在图片上之后,会显示一段隐藏的文字。不想让大家错过这么独特的彩蛋,我们将文字放在了漫画下方,这样处理确实不那么酷……

关于翻译,无论是xkcd主站漫画还是衍生系列What if,译者常常要面临“这个梗讲的到底是什么?”、“这个梗怎么用汉语讲才传神”甚至是“这到底是不是一个梗”的挑战。如果你发现这里发布的编译作品有错误,亦或是你有更好的翻译版本,非常欢迎留言告知,或投递至邮箱:contact@songshuhui.net。

26 May 15:01

Saturday Morning Breakfast Cereal - Kill All Humans? A Flowchart

by admin@smbc-comics.com

Hovertext: Once you realize there is no hope, you can relax and just enjoy the progress in machine learning.


New comic!
Today's News:
25 May 21:40

US Military Uses 8-Inch Floppy Disks To Coordinate Nuclear Force Operations

by BeauHD
An anonymous reader writes from a report via CNBC: A new report reveals the U.S. Defense Department is still using 8-inch floppy disks in a computer system that coordinates the operational functions of the nation's nuclear forces. The Defense Department's 1970s-era IBM Series/1 Computer and long-outdated floppy disks handle functions related to intercontinental ballistic missiles, nuclear bombers and tanker support aircraft, according to the new Governmental Accountability Office report. The report shows how outdated IT systems are being used to handle important functions related to the nation's taxpayers, federal prisoners and military veterans, as well as to the America's nuclear umbrella. "Federal legacy IT systems are becoming increasingly obsolete: Many use outdated software languages and hardware parts that are unsupported," the report found. "Agencies reported using several systems that have components that are, in some cases, at least 50 years old." From the report: "GAO pointed out that aging systems include the Treasury Department's 'individual master file,' which is the authoritative data source for individual taxpayers. It's used to assess taxes and generates refunds. That file 'is written in assembly language code -- a low-level computer code that is difficult to write and maintain -- and operates on an IBM mainframe,' the report said." The report also mentioned that several other departments, such as the departments of Treasury, Commerce, Health and Human Services and the Veterans' Administration, "reported using 1980s and 1990s Microsoft operating systems that stopped being supported by the vendor more than a decade ago."

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25 May 04:00

33p55

by Christopher Hastings

33p55

33p55 is a post from: The Adventures of Dr. McNinja Ads by Project Wonderful! Your ad could be here, right now.

33p55 is a post from: The Adventures of Dr. McNinja

Ads by Project Wonderful! Your ad could be here, right now.
24 May 14:41

Amidines for Versatile Cobalt(III)-Catalyzed Synthesis of Isoquinolines through C–H Functionalization with Diazo Compounds

by Jie Li, Mengyao Tang, Lei Zang, Xiaolei Zhang, Zhao Zhang and Lutz Ackermann

TOC Graphic

Organic Letters
DOI: 10.1021/acs.orglett.6b01199
24 May 10:53

Whoozit

24 May 22:49

SSSS page 529

Page 529 is up!
24 May 06:00

Menage a 3 - Trying not to be noticed

Menage a 3 - Trying not to be noticed
25 May 20:48

Black Phosphorus Nanosheets: Synthesis, Characterization and Applications

by Varrla Eswaraiah, Qingsheng Zeng, Yi Long, Zheng Liu

Black phosphorus (BP) is an emerging two-dimensional (2D) material with a natural bandgap, which has unique anisotropy and extraordinary physical properties. Due to its puckered structure, BP exhibits strong in-plane anisotropy unlike other layered materials. The bandgap tunability of BP enables a wide range of ultrafast electronics and high frequency optoelectronic applications ranging from telecommunications to thermal imaging covering the nearly entire electromagnetic spectrum, whereas no other 2D material has this functionality. Here, recent advances in the synthesis, fabrication, anisotropic physical properties, and BP-based devices including field effect transistors (FETs) and photodetectors, are discussed. Recent passivation approaches to address the degradation of BP, which is one of the main challenges to bring this material into real world applications, are also introduced. Finally, a comment is made on the recent developments in other emerging applications, future outlook and challenges ahead in BP research.

Thumbnail image of graphical abstract

Black phosphorus (BP) exhibits extraordinary performance, both in electronics and wide range optoelectronic devices due to its suitable bandgap. The unconventional anisotropy in BP arises from its puckered structure, which makes it an anisotropic material at large magnitude. It also has potential applications in gas sensing at ultralow level detection towards various gases, energy storage devices and thermoelectric applications.

25 May 19:44

American white male anxiety

by Jason Kottke

In Trump Taps Into the Anxiety of American White Males, Anand Giridharadas writes:

Yet there is some evidence that a sizable number of white men see the push toward diversity, along with the larger changes it telegraphs, as less about joining and more about replacement, and a country that is less hospitable to them.

That sentiment is perhaps expressed in a quote widely circulated online in these discussions, though the origin is unknown: "When you're accustomed to privilege, equality feels like oppression."

This is perhaps what Tyler Cowen was getting at with his highly speculative and provocative What the hell is going on?

The contemporary world is not very well built for a large chunk of males. The nature of current service jobs, coddled class time and homework-intensive schooling, a feminized culture allergic to most forms of violence, post-feminist gender relations, and egalitarian semi-cosmopolitanism just don't sit well with many...what shall I call them? Brutes?

Quite simply, there are many people who don't like it when the world becomes nicer. They do less well with nice. And they respond by in turn behaving less nicely, if only in their voting behavior and perhaps their internet harassment as well.

I wouldn't recommend it, but a spin through the comments on Cowen's piece provides some examples of what he's talking about.

Tags: Anand Giridharadas   Donald Trump   politics   Tyler Cowen
25 May 20:50

Modification of Wide-Band-Gap Oxide Semiconductors with Cobalt Hydroxide Nanoclusters for Visible-Light Water Oxidation

by Kazuhiko Maeda, Koki Ishimaki, Yuki Tokunaga, Daling Lu, Miharu Eguchi

Abstract

Cobalt-based compounds, such as cobalt(II) hydroxide, are known to be good catalysts for water oxidation. Herein, we report that such cobalt species can also activate wide-band-gap semiconductors towards visible-light water oxidation. Rutile TiO2 powder, a well-known wide-band-gap semiconductor, was capable of harvesting visible light with wavelengths of up to 850 nm, and thus catalyzed water oxidation to produce molecular oxygen, when decorated with cobalt(II) hydroxide nanoclusters. To the best of our knowledge, this system constitutes the first example that a particulate photocatalytic material that is capable of water oxidation upon excitation by visible light can also operate at such long wavelengths, even when it is based on earth-abundant elements only.

Thumbnail image of graphical abstract

When rutile TiO2, a wide-band-gap semiconductor, is modified with cobalt hydroxide nanoclusters, it can be used for photocatalytic water oxidation under visible-light irradiation at wavelengths of up to 850 nm. This material thus constitutes the first particulate photocatalyst that operates at such long wavelengths.

25 May 15:10

Facebook Could Be Eavesdropping On Your Phone Calls

by manishs
An anonymous reader writes: Facebook is not just looking at user's personal information, interests, and online habits but also to your private conversations, revealed a new report. According to NBC report, this may be the case as Kelli Burns, a professor at University of South Florida states, "I don't think that people realize how much Facebook is tracking every move we're making online. Anything that you're doing on your phone, Facebook is watching." the professor said. Now how do you prove that? Professor Kelli tested out her theory by enabling the microphone feature, and talked about her desire to go on a safari, informing about the mode of transport she would take. "I'm really interested in going on an African safari. I think it'd be wonderful to ride in one of those jeeps," she said aloud, phone in hand. The results were shocking, as less than 60 seconds later, the first post on her Facebook feed was about a safari story out of nowhere, which was then revealed that the story had been posted three hours earlier. And, after mentioning a jeep, a car ad also appeared on her page. On a support page, Facebook explains how this feature works: "No, we don't record your conversations. If you choose to turn on this feature, we'll only use your microphone to identify the things you're listening to or watching based on the music and TV matches we're able to identify. If this feature is turned on, it's only active when you're writing a status update." I wonder how many people are actually aware of this.

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25 May 17:36

277

by extrafabulouscomics@gmail.com

meep

25 May 00:23

E Ink Creates Full-Color Electronic Paper Display

by BeauHD
SkinnyGuy writes: The reflective display company finally figured out how to make those ultra tiny balls produce 32,000 colors in one super-low-powered display. It's a breakthrough for E Ink, display advertising and, maybe someday, e-readers and digital photo frames. The new prototype display, which can be manufactured in an array of sizes, features a 20-inch, 2500 x 1600 resolution and is equally as power-efficient as the monochromatic display. E Ink Holding's Head of Global marketing Giovanni Mancini said it can be powered with solar cells used in bus stop signage, for example. Some of the limitations center around the resolution and refresh rate. As of right now, the resolution is only 150 pixels per inch (ppi), which is about half the resolution of a typical 6-inch, monochromatic E ink display. It also takes about two seconds to fully resolve images, which is pretty slow when compared to today's e-readers. The company is currently only focused on using the new color display for commercial signage.

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24 May 18:38

Understanding the Formation Mechanism of Metal Nanocrystal@MOF-74 Hybrids

by Ignacio Luz, Anna Loiudice, Daniel T. Sun, Wendy L. Queen and Raffaella Buonsanti

TOC Graphic

Chemistry of Materials
DOI: 10.1021/acs.chemmater.6b00880
24 May 17:00

My New Favorite Sports Bra Is a $40 Piece of Elastic

by Beth Skwarecki on Vitals, shared by Andy Orin to Lifehacker

I didn’t believe it at first, either. When I first heard about the Būband, I googled up review after review looking for someone who could verify that it was a ridiculous garbage gimmick. But most of what I read was positive, so I told you guys all about it . I even bought one for myself, and now? I’m a believer.

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24 May 14:01

Bioreduction of Precious Metals by Microorganism: Efficient Gold@N-Doped Carbon Electrocatalysts for the Hydrogen Evolution Reaction

by Weijia Zhou, Tanli Xiong, Chaohong Shi, Jian Zhou, Kai Zhou, Nengwu Zhu, Ligui Li, Zhenghua Tang, Shaowei Chen

Abstract

The uptake of precious metals from electronic waste is of environmental significance and potential commercial value. A facile bioreductive synthesis is described for Au nanoparticles (ca. 20 nm) supported on N-doped carbon (Au@NC), which was derived from Au/Pycnoporus sanguineus cells. The interface and charge transport between Au and N-doped carbon were confirmed by HRTEM and XPS. Au@NC was employed as an electrocatalyst for the hydrogen evolution reaction (HER), exhibiting a small onset potential of −54.1 mV (vs. RHE), a Tafel slope of 76.8 mV dec−1, as well as robust stability in acidic medium. Au@NC is a multifunctional electrocatalyst, which demonstrates high catalytic activity in the oxygen reduction reaction (ORR), as evidenced by an onset potential of +0.97 V, excellent tolerance toward methanol, and long-term stability. This work exemplifies dual recovery of precious Au and fabrication of multifunctional electrocatalysts in an environmentally benign and application-oriented manner.

Thumbnail image of graphical abstract

Rags to riches: Gold nanoparticles supported on N-doped carbon (Au@NC) derived from the bioreduction of gold ions by Pycnoporus sanguineus cells are active HER electrocatalysts with a small onset potential of −54.1 mV and a Tafel slope of 76.8 mV dec−1. The catalyst is a stable and eco-friendly candidate for energy applications. Key: a) bioreduction by Au@microorganism, b) calcination, c) catalysis.