## 信息流

• In this paper, we find an identity which connects the overpartition function and the function of Rogers--Ramanujan--Gordon type overpartitions by considering the weights and gaps. This identity can be seen as an analogue of the weighted identity of Alladi.

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• We prove that, given a partition of the point-set of $PG(3,q), q=2^n >2$, by ovoids $\{\theta_i\}^q_{i=0}$ of $PG(3,q)$ and a line $\ell$ of $PG(3,q)$, not tangent to $\theta_0$ if $\ell^\perp$ denotes the polar of $\ell$ relative to the symplectic form on $PG(3,q)$ whose isotropic lines are the tangent lines to $\theta_0$, then $\ell$ and $\ell^\perp$ are tangent to distinct ovoids $\theta_j, \theta_k$, both distinct from $\theta_0$. This uses the fact that the radical of the linear code generated by the dual duals $\ell\cup \ell^\perp$ of the hyperbolic quadrics , with $\ell$ and $\ell^\perp$ as above, is of codimension $1$

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• In this short paper, we show that the peeling property still holds for Bondi-Sachs metrics with nonzero cosmological constant under the new boundary condition with nontrivial B, X, Y obtained in [6]. This should indicate the new boundary condition is natural. Moreover, we construct some nontrivial vacuum Bondi-Sachs metrics without the Bondi news. This provides a new feature of gravitational waves for nonzero cosmological constant.

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• In communications, one frequently needs to detect a parameter vector $\hbx$ in a box from a linear model. The box-constrained rounding detector $\x^\sBR$ and Babai detector $\x^\sBB$ are often used to detect $\hbx$ due to their high probability of correct detection, which is referred to as success probability, and their high efficiency of implimentation. It is generally believed that the success probability $P^\sBR$ of $\x^\sBR$ is not larger than the success probability $P^\sBB$ of $\x^\sBB$. In this paper, we first present formulas for $P^\sBR$ and $P^\sBB$ for two different situations: $\hbx$ is deterministic and $\hbx$ is uniformly distributed over the constraint box. Then, we give a simple example to show that $P^\sBR$ may be strictly larger than $P^\sBB$ if $\hbx$ is deterministic, while we rigorously show that $P^\sBR\leq P^\sBB$ always holds if $\hbx$ is uniformly distributed over the constraint box.

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• Aguilar introduced isotropic almost complex structures $J_{\delta , \sigma}$ on the tangent bundle of a Riemannian manifold $(M,g)$. These structures with the Liouville $1$-form define a class of Riemannian metrics $g_{\delta , \sigma}$ on $TM$ which are a generalization of the Sasaki metric. In this paper, the curvature tensors will be calculated and some results on the Einstein tangent bundles and tangent bundles of constant sectional curvature will be achieved. Moreover, it will be proved that $(T\mathbb{R}^n,g_{\delta , 0})$ is an Einstein manifold if and only if $\delta$ is a constant function.

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• In this paper, we investigate complete Riemannian manifolds satisfying the lower weighted Ricci curvature bound $\mathrm{Ric}_{N} \geq K$ with $K>0$ for the negative effective dimension $N<0$. We analyze two $1$-dimensional examples of constant curvature $\mathrm{Ric}_N \equiv K$ with finite and infinite total volumes. We also discuss when the first nonzero eigenvalue of the Laplacian takes its minimum under the same condition $\mathrm{Ric}_N \ge K>0$, as a counterpart to the classical Obata rigidity theorem. Our main theorem shows that, if the minimum is attained, then the manifold splits off the real line as a warped product of hyperbolic nature.

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• Place value numbers, such as the binary or decimal numbers can be represented by the end vertices (leaf or pendant vertices) of rooted symmetrical trees. Numbers that consist of at most a fixed number of digits are represented by vertices that are equidistant from the root vertex and the corresponding number representations do not depend on the distance from the root vertex.

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• We construct normal rationally connected varieties (of arbitrarily large dimension) not containing any smooth rational curves.

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• We study Tian's $\alpha$-invariant in comparison with the $\alpha_1$-invariant for pairs $(S_d,H)$ consisting of a smooth surface $S_d$ of degree $d$ in the projective three-dimensional space and a hyperplane section $H$. A conjecture of Tian asserts that $\alpha(S_d,H)=\alpha_1(S_d,H)$. We show that this is indeed true for $d=4$ (the result is well known for $d\leqslant 3$), and we show that $\alpha(S_d,H)<\alpha_1(S_d,H)$ for $d\geqslant 8$ provided that $S_d$ is general enough. We also construct examples of $S_d$, for $d=6$ and $d=7$, for which Tian's conjecture fails. We provide a candidate counterexample for $S_5$.

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• In this paper, we give a characterization of Nikol'ski\u{\i}-Besov type classes of functions, given by integral representations of moduli of smoothness, in terms of series over the moduli of smoothness. Also, necessary and sufficient conditions in terms of monotone or lacunary Fourier coefficients for a function to belong to a such a class are given. In order to prove our results, we make use of certain recent reverse Copson- and Leindler-type inequalities.

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• Multi stage stochastic programs arise in many applications from engineering whenever a set of inventories or stocks has to be valued. Such is the case in seasonal storage valuation of a set of cascaded reservoir chains in hydro management. A popular method is Stochastic Dual Dynamic Programming (SDDP), especially when the dimensionality of the problem is large and Dynamic programming no longer an option. The usual assumption of SDDP is that uncertainty is stage-wise independent, which is highly restrictive from a practical viewpoint. When possible, the usual remedy is to increase the state-space to account for some degree of dependency. In applications this may not be possible or it may increase the state space by too much. In this paper we present an alternative based on keeping a functional dependency in the SDDP - cuts related to the conditional expectations in the dynamic programming equations. Our method is based on popular methodology in mathematical finance, where it has progres

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• We investigate monotone circuits with local oracles (K., 2016), i.e., circuits containing additional inputs $y_i = y_i(\vec{x})$ that can perform unstructured computations on the input string $\vec{x}$. Let $\mu \in [0,1]$ be the locality of the circuit, a parameter that bounds the combined strength of the oracle functions $y_i(\vec{x})$, and $U_{n,k}, V_{n,k} \subseteq \{0,1\}^m$ be the classical sets of positive and negative inputs considered for $k$-clique in the approximation method (Razborov, 1985). Our results can be informally stated as follows. 1. For an appropriate extension of depth-$2$ monotone circuits with local oracles, we show that the size of the smallest circuits separating $U_{n,3}$ (triangles) and $V_{n,3}$ (complete bipartite graphs) undergoes two phase transitions according to $\mu$. 2. For $5 \leq k(n) \leq n^{1/4}$, arbitrary depth, and $\mu \leq 1/50$, we prove that the monotone circuit size complexity of separating the sets $U_{n,k}$ and $V_{n,k}$ is $n^{\Theta 收起 • In this paper, we obtain bounds on the$L^1$norm of the sum$\sum_{n\le x}\tau(n) e(\alpha n)$where$\tau(n)$is the divisor function. 收起 • We study the degrees of freedom (DoF) of a$K$-user parallel MISO broadcast channel with arbitrary levels of partial CSIT over each subchannel. We derive a sum-DoF upperbound which depends on the average CSIT quality of each user. This upperbound is shown to be tight under total order, i.e. when the order of users with respect to their CSIT qualities is preserved over all subchannels. In this case, it is shown that separate coding over each subchannel is optimum in a sum-DoF sense. 收起 • The Docker blog introduces the Moby Project, which aims to advance the software containerization movement. "It provides a “Lego set” of dozens of components, a framework for assembling them into custom container-based systems, and a place for all container enthusiasts to experiment and exchange ideas. Think of Moby as the “Lego Club” of container systems." 收起 • 04-19 Ars Technica 79 Sensors in phones running both iOS and Android reveal all kinds of sensitive info. 收起 • 04-19 THE NEW YORKER 79 At some point during 2015, Kendrick Lamar came to seem like much more than a rapper. One of his best songs, “Alright,” was adopted by the Black Lives Matter movement as an informal anthem; sing-alongs erupted at rallies and protests across the country. “Alright” somehow manages to sound carefree yet urgent, like a radio jingle perforated by drum fills. “We been hurt, been down before,” Lamar raps, preaching about the glory inherent in struggle. “We gon’ be alright.” He sounded like a prophet, capable of articulating what people in the streets desired but couldn’t put into words. 收起 • 04-19 Ars Technica 79 Though for now, only recent Intel chips need apply. 收起 • 04-19 Slashdot 76 From a report: Malaysia Air, which lost a wide-body jet with 239 people aboard three years ago in one of history's most enduring aviation mysteries, has become the first airline to sign an agreement for space-based flight tracking of its aircraft. The subsidiary of Malaysian Airline System Bhd reached a deal with Aireon LLC, SITAONAIR and FlightAware LLC to enable it to monitor the flight paths of its aircraft anywhere in the world including over the polar regions and the most remote oceans, according to an emailed press release from Aireon. Aireon is launching a new satellite network with Iridium Communications Inc. that will allow it to monitor air traffic around the globe. It's projected to be completed in 2018. Most international flights are already transmitting their position with technology known as ADS-B and the signals can be tracked from the ground or space. The U.S. Federal Aviation Administration has already installed a ground-based tracking system for ADS-B. "Real-time glob 收起 • 04-19 Hacker News 87 Improving startup time in Atom with V8 snapshots 收起 • 04-19 Hacker News 85 Image-to-image translation in PyTorch 收起 • 04-19 Slashdot 75 tedlistens writes: Not long ago, social payments company Tilt seemed to have it all -- a hot idea; cool, young founders with Y Combinator pedigrees; and$67 million in funding -- not to mention a $375 million valuation. But Tilt was more successful at cultivating its user growth and fun, frat-tastic office culture than at nailing down a viable business model. When Tilt finally ran out of cash, the party ended with the company's sale at fire-sale prices to fellow Y Combinator alums Airbnb in an aqui-hire deal. Where did it all go wrong? Here's an excerpt from the report: "Tilt was based on the premise that 'something like PayPal and Facebook would collide,' Tilt founder and CEO James Beshara says. The company aspired to be a social network for money -- instead of sharing photos and videos, users exchanged digital cash for birthday ragers and beer runs. During Tilt's early years, the pitch was simple, and carefully calibrated for Silicon Valley boardrooms: 'Let's prove that we can domina 收起 • 04-19 MIT Technology 78 A project from the Bill & Melinda Gates Foundation aims to use distributed ledger technology to help the two billion people worldwide who lack bank accounts. 收起 • Hallmarks of Soviet postwar building boom are finally meeting their demise 收起 • The xda-developers blog looks at Project Halium. "This open-source project is trying to pool developers from Ubuntu Touch ports, Sailfish OS community developers, the open webOS Lune OS project, and KDE Plasma Mobile contributors, among other developers (Jolla, we suspect) to put an end to the fragmentation seen in their respective project’s lower-level base. Currently, Ubuntu Touch, Sailfish OS/Mer, Plasma Mobile, and others use different Android source trees and methods for differently-built stacks. This leads to a lot of fragmentation among the most popular non-Android, GNU/Linux-based mobile OS projects in their use of the Android source tree, how the Android init is started, and how images are flashed to the device. Many of these projects essentially do the same job, but in a different way." The goal of Halium is to work towards a common Linux base, which can be used by all of these different projects. 收起 • 04-19 Hacker News 79 H-1B visas mainly go to Indian outsourcing firms 收起 • An anonymous reader shares a PCWorld report: Microsoft has crazy quantum computing plans: first, it built hardware based on a particle that hasn't even been discovered. Now, it's hoping to co-design super-cool memory for quantum computers. The company is working with Rambus to develop and build prototype computers with memory subsystems that can be cooled at cryogenic temperatures, typically below minus 180 degrees Celsius or minus 292 degrees Fahrenheit. Cryogenics goes hand in hand with quantum computers, which promise to be significantly faster than today's PCs and servers and may even eventually replace them. But the systems are notoriously unstable and need to be stored in refrigerators for faster and secure operation. As an example, D-Wave's 2000Q quantum computer needs to be kept significantly cooler than supercomputers so operations don't break down. 收起 • Less than a decade ago, if you were to ask a master chef which type of cook stove he preferred, he would have answered gas, without question. Now there's another option. 收起 • 04-19 Ars Technica 82 NASA is taking steps to ensure this kind of capability gap never again occurs. 收起 • 04-19 MIT Technology 78 The more satellites we launch without retiring old ones, the more there are to collide with one another. 收起 • 04-19 Slashdot 76 wisebabo writes: Salty diet makes you hungry, not thirsty. Science Daily reports: "In a study carried out during a simulated mission to Mars, an international group of scientists has found exactly the opposite to be true. 'Cosmonauts' who ate more salt retained more water, weren't as thirsty, and needed more energy." So if you don't want to gain weight on your trip to Mars, don't eat salty chips. If you don't want to gain weight at home, maybe you should stay away from them as well. From the report: "The studies were carried out by Natalia Rakova (MD, PhD) of the Charite and MDC and her colleagues. The subjects were two groups of 10 male volunteers sealed into a mock spaceship for two simulated flights to Mars. The first group was examined for 105 days; the second over 205 days. They had identical diets except that over periods lasting several weeks, they were given three different levels of salt in their food. The results confirmed that eating more salt led to a higher salt content in 收起 • 04-19 Slashdot 79 adeelarshad82 writes: Califorctenus cacachilensis, recently named by researchers at the San Diego Natural History Museum, was first located in 2013 in a mountain range in Baja California Sur, Mexico. The eye pattern led researchers to believe it was potentially part of a group of wandering spiders from the Ctenidae family. Knowing Ctenidae are nocturnal, the researchers returned to the cave at night, where they spotted a living specimen. Their research further led them to confirm that it was a previously unidentified species related to the Brazilian wandering spider. The findings have been published in Zootaxa. 收起 • 04-19 Ars Technica 78 One 4.7-inch phone, one 5.5-inch phone, and something totally new. 收起 • 04-19 Hacker News 79 Relay Modern: Simpler, faster, more extensible 收起 • 04-19 Hacker News 93 React-Move – Animate anything in React 收起 • 04-19 Ars Technica 83 Study of language bias has implications for AI as well as human cognition. 收起 • sciencehabit quotes a report from Science Magazine: For decades, particle physicists have yearned for physics beyond their tried-and-true standard model. Now, they are finding signs of something unexpected at the Large Hadron Collider (LHC), the world's biggest atom smasher at CERN, the European particle physics laboratory near Geneva, Switzerland. The hints come not from the LHC's two large detectors, which have yielded no new particles since they bagged the last missing piece of the standard model, the Higgs boson, in 2012, but from a smaller detector, called LHCb, that precisely measures the decays of familiar particles. The latest signal involves deviations in the decays of particles called B mesons -- weak evidence on its own. But together with other hints, it could point to new particles lying on the high-energy horizon. "This has never happened before, to observe a set of coherent deviations that could be explained in a very economical way with one single new physics contributio 收起 • 04-19 Ars Technica 84 Version 1.18 now live for Windows and Mac, will be compatible with summer remaster. 收起 • 04-19 Hacker News 89 Nim programming language 收起 • 04-19 Ars Technica 55 Software, including air traffic awareness and collision avoidance, passes Navy test. 收起 • 04-19 Slashdot 76 An anonymous reader quotes a report from TechCrunch: Nearly two decades after its 1998 release, StarCraft is now free. Legally! Blizzard has just released the original game -- plus the Brood War expansion -- for free for both PC and Mac. You can find it here. Up until a few weeks ago, getting the game with its expansion would've cost$10-15 bucks. The company says they've also used this opportunity to improve the game's anti-cheat system, add "improved compatibility" with Windows 7, 8.1, and 10, and fix a few long lasting bugs. So why now? The company is about to release a remastered version of the game in just a few months, its graphics/audio overhauled for modern systems. Once that version hits, the original will probably look a bit ancient by comparison -- so they might as well use it to win over a few new fans, right?

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•   04-19 Hacker News 85

GTA V self-driving car tutorial in Python tutorial

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•   04-19 Hacker News 83

Caffe2: Open Source Cross-Platform Machine Learning Tools

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• A new study from the University of Southampton warns that expanding broadband networks via launching "mega constellations" of thousands of communications satellites could increase catastrophic crashes of dangerous space junk in Earth's orbit. "Dr Hugh Lewis, a senior lecturer in aerospace engineering at the University of Southampton, ran a 200-year simulation to assess the possible consequences of such a rise in orbital traffic," reports The Guardian. "He found it could create a 50% increase in the number of catastrophic collisions between satellites." From the report: Such crashes would probably lead to a further increase in the amount of space junk in orbit, he said, leading to the possibility of further collisions and potential damage to the services the satellites were intended to provide. The European Space Agency, which funded Lewis's research, is calling for the satellites planned for orbital mega-constellations to be able to move to low altitudes once their missions are over so

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•   04-19 Hacker News 82

Boeing to lay off hundreds more engineers

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•   04-19 Slashdot 74

According to Reuters, Boeing has warned its employees that it "planned another round of involuntary layoffs that would affect hundreds of engineers at its commercial airplanes unit." From the report: The latest job cuts followed a prior involuntary reduction of 245 workers set for May 19 as the company responded to increasing competition and slowing aircraft sales. The additional layoffs are due to start June 23, according to the memo from John Hamilton, vice president of engineering at Boeing Commercial Airplanes. "We are moving forward with a second phase of involuntary layoffs for some select skills in Washington state and other enterprise locations," the memo said. "We anticipate this will impact hundreds of engineering employees. Additional reductions in engineering later this year will be driven by our business environment and the amount of voluntary attrition."

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•   04-19 MIT Technology 51

In order to thrive in today’s demanding business environment, here’s how savvy organizations are using emerging technologies like hybrid IT to achieve agility from the data center to the network edge.

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• Avegant is confident enough about its light-field-based mixed reality technology that it's willing to show and tell

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•   04-19 MIT Technology 75

China’s leading search engine hopes to speed development of autonomous driving and draw carmakers to its services.

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•   04-19 MIT Technology 77

An expert who is studying Bitcoin and blockchain technologies says those looking to commercialize them need to be aware of potentially dangerous technical issues.

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• MojoKid writes: Samsung recently launched the Galaxy S8 series of Android smartphones to much fanfare but only recently did the handsets begin to arrive in market for testing and review. Though the high-polish styling of the Galaxy S8 and Galaxy S8+ may or may not appeal to you, few would argue with its claims of significant performance gains and improved battery life. As it turns out, in deep-dive testing and benchmarking, the Galaxy S8 series is significantly faster than any other Android handset on the market currently, especially when it comes to graphics and gaming workloads. The Qualcomm Snapdragon 835 processor on board the GS8 is currently a Samsung exclusive, though it's expected to arrive in other handsets later this year. The Adreno 540 graphics engine on board the new Snapdragon chip is roughly 25% faster than the previous generation 820/821 series, though the chip is only about 10 percent faster in standard CPU-intensive tasks. Regardless, these are appreciable gains, espe

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•   04-19 Hacker News 80

A customer reported an error in the map used by Flight Simulator

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•   04-19 MIT Technology 79

According to one prominent economist, cryptocurrencies could make financial systems safer and more accessible to all.

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•   04-19 MIT Technology 80

A member of the Federal Reserve and a researcher say there are a lot of problems to solve before digital currency will ever disrupt the global financial system.

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•   04-19 Ars Technica 74

Renewables have "destroyed jobs" and diminished energy diversity, Perry claims.

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•   04-19 Quanta Magazine 89

A Cosmic Burst Repeats, Deepening a Mystery

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•   04-19 Hacker News 86

File System Improvements to the Windows Subsystem for Linux

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•   04-19 Ars Technica 58

It's the small things that shatter my suspension of disbelief.

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•   04-19 Ars Technica 83

"Both suspects were found to be wearing recording harnesses under their shirts."

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•   04-19 Ars Technica 80

"Augmented reality" platform launches in closed beta today.

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• From a report: Facebook will rely on an army of outside developers to contribute augmented reality image filters and interactive experiences to its new Camera Effects platform. Later today the first effects will become availabe inside Facebook's Camera feature on smartphones, but the Camera Effects platform is designed to eventually be compatible with future augmented reality hardware such as eyeglasses.

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•   04-19 MIT Technology 80

By rolling out an AR platform that lets developers create effects for its camera, Facebook may finally make the technology popular.

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• Facebook CEO Mark Zuckerberg says he has stopped waiting for glasses and the company is diving into phone-based AR

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•   04-19 TechCrunch 82

Facebook Announces React Fiber, a Rewrite of Its React Framework

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•   04-19 Slashdot 79

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•   04-19 Hacker News 82

Etleap Is Hiring Java Engineers to Build Next-Gen ETL

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•   04-19 Slashdot 76

Apple is reportedly building three new iPhones, though the one with the most new features might not launch until a couple of months after the others. According to a report on Bloomberg, Apple is testing three new phones that it plans to launch this fall, including two with the same screen sizes as the iPhone 7 and iPhone 7 Plus. The third iPhone, which may be named to help celebrate the 10th anniversary of the original iPhone's launch, is said to pack a new design with a stainless steel frame and curved glass. It's said to feature an embedded fingerprint reader and use OLED panels from Samsung and may have a screen that takes up most of the front of the smartphone's face. From the article: Apple also tested a more ambitious prototype with the same slightly curved front and steel frame, but a glass back with more dramatic curves on the top and bottom like the original iPhone design from 2007, one of the people said.

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•   04-19 Ars Technica 74

A total of 13 charged in PNC and Bank of America card-cloning scheme.

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•   04-19 THE NEW YORKER 74

What did you do this morning? Perhaps you woke up at your regular time, made coffee in the same machine that you did yesterday, took the same commute to work that you do every day. In adult life, the details that distinguish one day from the next tend to blur, and our routines remain, by and large, identical. The movies of our lives would be excruciating studies of repetition.

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• An anonymous reader quotes a report from BleepingComputer: GitHub user Zeffy has created a patch that removes a limitation that Microsoft imposed on users of 7th generation processors, a limit that prevents users from receiving Windows updates if they still use Windows 7 and 8.1. This limitation was delivered through Windows Update KB4012218 (March 2017 Patch Tuesday) and has made many owners of Intel Kaby Lake and AMD Bristol Ridge CPUs very angry last week, as they weren't able to install any Windows updates. Microsoft's move was controversial, but the company did its due diligence, and warned customers of its intention since January 2016, giving users enough time to update to Windows 10, move to a new OS, or downgrade their CPU, if they needed to remain on Windows 7 or 8.1 for various reasons. When the April 2017 Patch Tuesday came around last week, GitHub user Zeffy finally had the chance to test four batch scripts he created in March, after the release of KB4012218. His scripts wo

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•   04-19 THE NEW YORKER 73

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•   04-19 Hacker News 83

The History of Computer RPGs

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•   04-19 Hacker News 74

Support for tagging of Lambda functions and for the Python 3.6 runtime

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•   04-19 THE NEW YORKER 73

Neil Gorsuch takes his seat on the Supreme Court this week and will immediately have a chance to make his mark with a case that involves one of the top priorities for the conservative movement: lowering the barriers between church and state. The issue has long been a priority for conservatives, on the Court and elsewhere. But the complexion of the controversy has changed in recent years, as those on the right have become more aggressive in pressing constitutional arguments. At one point, the issues in this area were fairly straightforward, if largely symbolic. Could a Christmas crèche be displayed on municipal property? (Yes, as long as there are, say, plastic reindeer as well as the baby Jesus.) Can a student deliver a prayer before a high-school football game? (Yes, in the stands, but not over the public-address system.)

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• This year many of the formulas, documents, and snippets of engineer-speak on HBO’s "Silicon Valley" will be coming from Stanford postdoc Dmitri Pavlichin

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•   04-19 THE NEW YORKER 76

Ever since Donald Trump became President, mayors and city council members in “sanctuary cities”—places where local law-enforcement officials limit their coöperation with immigration agents—have promised to resist the federal government’s crackdown on immigrants. The new Administration has responded with threats (to cut sanctuary cities’ funding), reprisals (like launching more raids in specific jurisdictions), and accusations (that these cities are making the country less safe). City leaders have, in turn, criticized immigration raids, and raised money to pay for the legal bills of residents who’ve been arrested. But Immigration and Customs Enforcement (ICE) answers to the federal government, not to local officeholders, and as it continues to expand the scope and reach of its activity, the limits of city power are becoming increasingly clear.

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• Two new studies show good results on DBS for depression, but the treatment is still far from clinical use

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•   04-19 Ars Technica 73

Hajime battles with Mirai for control over the Internet of poorly secured things.

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•   04-19 LWN 42

Every conference venue has problems with the mix of room sizes, but I don't recall ever going to a talk that so badly needed to be in a bigger room as Jessie Frazelle and Alex Mohr's talk at CloudNativeCon/KubeCon Europe 2017 on securing Kubernetes. The cause of the enthusiasm was the opportunity to get "best practice" information on securing Kubernetes, and how Kubernetes might be evolving to assist with this, directly from the source.

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