A new growing pruning deep learning neural network algorithm (GP-DLNN)

Neural Computing and Applications - During the last decade, a significant research progress has been drawn in both the theoretical aspects and the applications of Deep Learning Neural Networks....     

避难城 贝尔谢巴市贝丝哈罗契姆

正灰色贝尔谢巴,一个即使在寒冬也极度干燥、尘土飞扬的城市。贝尔谢巴向干涸的河床缓缓移动,沿着河床,另一头便是沙漠。当地的标准建筑一般采用灰色的清水混凝土,与城市的黄色尘土相呼应。大学、市政厅、索罗卡医院和"内格夫中心"都位于城市主干道上,全部由清水混凝土建造。在贝尔谢巴西边,能看到交叉路口上的战斗机;在贝尔谢巴南边,能看到一辆远离战场的装甲车。贝尔谢巴就位于战斗机和装甲车中间。在两年前的"铸铅行动"中,这里曾遭遇多番"格拉德"型导弹袭击。内格夫旅十字路口位于城市东北方向的入口处,     

Extreme Energy Absorption in Glassy Polymer Thin Films by Supersonic Micro-projectile Impact

The nature of polymer deformation depends on the ability of the chain segments to respond to the applied load at the imposed loading rate. When the polymer response time is significantly longer than the loading duration, the polymer responds in a brittle manner. Polystyrene, for example, is a brittle, glassy solid at room temperature and absorbs very little energy during deformation. Here we show unexpected, thickness and strain-rate-dependent deformation processes in thin polystyrene films at extreme axisymmetric tensile deformation rates. The impact of a supersonic micro-projectile initiates crazing, yielding, and adiabatic heating leading to extensive plastic flow of a load-bearing viscoelastic melt prior to perforation and film rupture. The less entangled, more mobile near-surface regions of these freestanding films favorably modify these processes, increasing the specific energy absorption as thickness decreases at the highest impact velocity. This results in unprecedented energy absorption at extreme strain rates in what is normally considered a brittle material.     

3D Printing of Viscoelastic Suspensions via Digital Light Synthesis for Tough Nanoparticle–Elastomer Composites

The rheological parameters required to print viscoelastic nanoparticle suspensions toward tough elastomers via Digital Light Synthesis (DLS) (an inverted projection stereolithography system) are reported. With a model material of functionalized silica nanoparticles suspended in a poly(dimethylsiloxane) matrix, the rheological-parameters-guided DLS can print structures seven times tougher than those formed from the neat polymers. The large yield stress and high viscosity associated with these high concentration nanoparticle suspensions, however, may prevent pressure-driven flow, a mechanism essential to stereolithography-based printing. Thus, to better predict and evaluate the printability of high concentration nanoparticle suspensions, the boundary of rheological properties compatible with DLS is defined using a non-dimensional Peclet number (Pe). Based on the proposed analysis of rheological parameters, the border of printability at standard temperature and pressure (STP) is established by resin with a silica nanoparticle mass fraction (ϕ_silica) of 0.15. Above this concentration, nanoparticle suspensions have Pe > 1 and are not printable. Beyond STP, the printability can be further extended to ϕ_silica = 0.20 via a heating module with lower shear rate to reduce the Pe < 1. The printed rubber possesses even higher toughness (Γ ≈ 155 kJ m⁻³), which is 40% higher over that of ϕ_silica = 0.15.     

X-ray microscopy using computerized axial tomography

Computerized axial tomography with MoK_a X-radiation has been used to study a 0.8times0.8 mm column of human femoral bone at a resolution of 15 μm. This non-destructive X-ray microscopic technique allowed ‘sections' to be made with 25 μm separation and the distribution of linear absorption coefficient in each section to be determined.     

The influence of mean stress and amplitude distribution on random load fatigue crack growth

Random load fatigue crack growth tests have been conducted on a low alloy steel, Q1N, under varying conditions of mean stress and probability density function (pdf). The results show that Q1N is insensitive to the pdf, but that a mean stress effect is measurable. This mean stress dependence is not found in constant amplitude tests on the same material.A modified form of the Fonnan equation was found to fit the data adequately.     

Associating protein activities with their genes: rapid identification of a gene encoding a methylglyoxal reductase in the yeast Saccharomyces cerevisiae

Methylglyoxal is associated with a broad spectrum of biological effects, including cytostatic and cytotoxic activities. It is detoxified by the glyoxylase system or by its reduction to lactaldehyde by methylglyoxal reductase. We show that methylglyoxal reductase (NADPH-dependent) is encoded by GRE2 (YOL151w). We associated this activity with its gene by partially purifying the enzyme and identifying by MALDI-TOF the proteins in candidate bands on SDS-PAGE gels whose relative intensities correlated with specific activity through three purification steps. The candidate proteins were then purified using a glutathione-S-transferase tag that was fused to them, and tested for methylglyoxal reductase activity. The advantage of this approach is that only modest protein purification is required. Our approach should be useful for identifying many of the genes that encode the metabolic pathway enzymes that have not been associated with a gene (about 275 in S. cerevisiae, by our estimate).     

The siren's call: Terror management and the threat of men's sexual attraction to women.

Why do sexually appealing women often attract derogation and aggression? According to terror management theory, women's sexual allure threatens to increase men's awareness of their corporeality and thus mortality. Accordingly, in Study 1 a subliminal mortality prime decreased men's but not women's attractiveness ratings of alluring women. In Study 2, mortality salience (MS) led men to downplay their sexual intent toward a sexy woman. In Study 3, MS decreased men's interest in a seductive but not a wholesome woman. In Study 4, MS decreased men's but not women's attraction to a sexy opposite-sex target. In Study 5, MS and a corporeal lust prime increased men's tolerance of aggression toward women. Discussion focuses on mortality concerns and male sexual ambivalence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

When sex is more than just sex: Attachment orientations, sexual experience, and relationship quality.

The authors explored the contribution of individual differences in attachment orientations to the experience of sexual intercourse and its association with relationship quality. In Study 1, 500 participants completed self-report scales of attachment orientations and sexual experience. The findings indicated that whereas attachment anxiety was associated with an ambivalent construal of sexual experience, attachment avoidance was associated with more aversive sexual feelings and cognitions. In Study 2, 41 couples reported on their attachment orientations and provided daily diary measures of sexual experiences and relationship interactions for a period of 42 days. Results showed that attachment anxiety amplified the effects of positive and negative sexual experiences on relationship interactions. In contrast, attachment avoidance inhibited the positive relational effect of having sex and the detrimental relational effects of negative sexual interactions. The authors discuss the possibility that attachment orientations are associated with different sex-related strategies and goals within romantic relationships. (PsycINFO Database Record (c) 2010 APA, all rights reserved)