随身Wi-Fi蹭网不花钱

很多商旅人士常常会遇到这样的问题，在火车或宾馆中，不论我们使用的是台式机还是笔记本电脑，周围如果没有Wi-Fi环境的话，我们的其它设备是不能享受到同样的网络服务的，但是如果拥有了一支小小的随身WI-Fi，它则能充当好一个神奇的媒介，将PC端的网络分流出来，让更多的移动设备可以共享到流畅优质的网速，让你觉得，原来“蹭网”竟然如此轻松。     

The Contribution of Domain Specificity in the Highly Modular Mind

Is there a notion of domain specificity which affords genuine insight in the context of the highly modular mind, i.e. a mind which has not only input modules, but also central ‘conceptual’ modules? Our answer to this question is no. The main argument is simple enough: we lay out some constraints that a theoretically useful notion of domain specificity, in the context of the highly modular mind, would need to meet. We then survey a host of accounts of what domain specificity is, based on the intuitive idea that a domain specific mechanism is restricted in the kind of information that it processes, and show that each fails at least one of those constraints.     

Wetting characteristics of oxygen-containing iron melts on refractory oxides

As part of refractory erosion studies, the wetting behaviour of molten iron containing varying amounts of oxygen on refractory oxides was investigated by the sessile drop method. The oxides investigated in the present work were alumina, silica and mullite. The reactions were followed in static as well as dynamic modes, under isothermal conditions, through contact angle measurements. Other parameters investigated in the present study were temperature and oxygen partial pressure. For all substrates, the contact angles started decreasing due to the lowering of the surface tension of iron, as oxygen at constant partial pressure, came into contact with the surface of the drop. At a critical level of oxygen in the metal drop, a reaction product started forming at the drop/substrate interface and at this stage the contact angle dropped suddenly. In all cases there was a tendency for the contact angle to increase after this minimum. In the alumina case, the iron drop moved away from the reaction site, once the product layer had been formed at the interface, probably due to the imbalance in the surface forces. In the case of SiO₂ and mullite, liquid slags were formed. The substrates were analysed through SEM and EDS. The reaction products identified were in agreement with thermodynamic predictions. In the case of SiO₂, deep erosions were formed along the periphery of the drops, probably due to Marangoni flow. The possible mechanisms of the reactions and their impact on refractory erosion are discussed in the light of the present experimental results.     

云冈石窟博物馆

项目位于大同市云冈石窟景区.景区内有世界闻名的始开凿于北魏的巨大石窟艺术群,为了既不影响自然和人文景观,同时又使陈列馆建筑与历史文化、宗教艺术互动和对话,建筑的主要功能都建在地下,只有屋顶和南立面露出地面,主入口北立面通过下沉广场与紧邻的石窟联系起来.鉴于游人在室外参观最后几窟的位置已经比陈列馆高出20多米,站在高处远眺能看见陈列馆的屋顶,因此屋顶成为本建筑最重要的第五立面,设计立意来自佛海茫茫的浩瀚意境的形式物化,呈波浪状像从地面自然生长出来的无限延伸;细部设计源自昙曜五窟大佛身上飘逸的衣纹;屋顶天窗的处理犹如神秘的佛眼,带着迷人的微笑回望着千年的宗教石窟艺术遗存,同时也为地下室空间带去一丝光明.     

H-NMR and CD studies on the structural transition of serum albumin in the acidic region--the N-->F transition

Helical content (f(alpha)) of bovine mercaptalbumin (BMA) showed the characteristic two-step decrease in the acidic region, one corresponding to the N-->F transition (pH 4.40-->3.75; f(alpha), 0.68-->0.58) and the other to the F-->E transition (the acid-expansion) (pH 3.60-->2.90; falpha, 0.58-->0.48). However, falpha of human serum albumin (HSA) mainly decreased in the N-->F transition (N-->F, pH 4.6-->3.4; falpha, 0.70-->-0.55 and F-->E, below pH 3.0; falpha, 0.55-->0.52). The difference in pH-profile of f(alpha) between BMA and HSA might be due to the microheterogeneity. The 1H-NMR spectra and cross-relaxation times (T(IS)) from irradiated to observed protein protons, which reflect the structural fluctuation and/or mobilability in proteins, were measured on the N-, F-, E-forms of HSA and BMA, and the N*-form (8.23 M urea, neutral pD) of iodoacetamide-blocked HSA (IA-HSA) and bovine serum albumin (IA-BSA). The 1H-NMR spectra and elongations of T(IS) values for the F- and E-forms of HSA and the E-form of BMA were quite similar to those for the N*-form of IA-HSA and IA-BSA, indicating the liberation of the intramolecular motion in the F- and E-forms. Those for the F-form of BMA were intermediate between the N- and E-form. The present results together with the reported data on hydrodynamic radii and D-H exchange reaction, indicate that the F-form of HSA and presumably BMA has a native-like globule form with a highly helical state and fluctuating tertiary structure. Thus, all of the present findings on the F-form of serum albumin seem to be in accord with the structural features for the F-form suggested by Foster's group (1-3, 19, 20, 22, 23) and the molten globule state demonstrated by Dolgikh et al. (40), and Ohgushi and Wada (36, 37).     

Plasma cleaning technique for the removal of mixed materials

Erosion of materials by physical sputtering is the most fundamental of plasma–surface interactions in tokamaks. Carbon and tungsten materials planned to be used in ITER divertor are subjected to erosion, which produces local redeposition of mixed layers. Tritium retention in mixed materials is the major concern due to the limits imposed for safety reason by nuclear licensing. No technique has yet been proven capable of remove trapped tritium in ITER operating environment. In-situ oxidative cleaning techniques have been developed to remove co-deposits. Since oxygen can be incompatible with Be first wall (getter effect), a plasma cleaning using hydrogen–argon gas mixture has been proposed in this work. C–W mixed materials were produced for this purpose by capacitively coupled RF plasma sputtering. The process has been investigated by optical emission spectroscopy and Langmuir probe.     

低爆速爆炸焊接炸药稀释剂优选

为解决膨化硝铵炸药中食盐添加剂吸湿性强以及对环境影响大的问题,通过实验,选择几种稀释剂对膨化硝铵炸药的爆速进行分析与比较,结果表明,JM-4稀释剂加入量为20%～25%时,炸药的爆速为2341～2523m·s-1,具有较好稀释能力,可作为低爆速爆炸焊接炸药理想的稀释剂。     

3D simulation of hydrogen production by ammonia decomposition in a catalytic membrane reactor

Ammonia decomposition in an integrated Catalytic Membrane Reactor for hydrogen production was studied by numerical simulation. The process is based on anhydrous NH₃ thermal dissociation inside a small size reactor (30 cm³), filled by a Ni/Al₂O₃ catalyst. The reaction is promoted by the presence of seven Pd coated tubular membranes about 203 mm long, with an outer diameter of 1.98 mm, which shift the NH₃ decomposition towards the products by removing hydrogen from the reaction area. The system fluid-dynamics was implemented into a 2D and 3D geometrical model. Ammonia cracking reaction over the Ni/Al₂O₃ catalyst was simulated using the Temkin-Pyzhev equation.Introductory 2D simulations were first carried out for a hypothetic system without membranes. Because of reactor axial symmetry, different operative pressures, temperatures and input flows were evaluated. These introductory results showed an excellent ammonia conversion at 550 °C and 0.2 MPa for an input flow of 1.1 mg/s, with a residual NH₃ of only a few ppm. 3D simulations were then carried out for the system with membranes. Hydrogen adsorption throughout the membranes has been modeled using the Sievert’s law for the dissociative hydrogen flux. Several runs have been carried out at 1 MPa changing the temperature between 500 °C and 600 °C to point out the conditions for which the permeated hydrogen flux is the highest. With temperatures higher than 550 °C we obtained an almost complete ammonia conversion already before the membrane area. The working temperature of 550 °C resulted to be the most suitable for the reactor geometry. A good matching between membrane permeation and ammonia decomposition was obtained for an NH₃ input flow rate of 2.8 mg/s. Ammonia reaction shift due to the presence of H₂ permeable membranes in the reactor significantly fostered the dissociation: for the 550 °C case we obtained a conversion rate improvement of almost 18%.     

Precipitation of BCC phase from nonequilibrium A13-Type phase in rapidly solidified high-Carbon Fe-Cr-Mo alloy

Formerly Graduate Student, Kyushu Institute of Technology     

Evaluating the interdependence of aging-related changes in visual and auditory acuity, balance, and cognitive functioning.

High proportions of shared age-related variance are found among measures of perceptual acuity, balance, muscle strength, and cognitive capabilities in age-heterogeneous, cross-sectional studies. Reliance on cross-sectional studies is problematic, however, because associations may arise from age-related mean trends. Narrow age-cohort samples provide an alternative basis for testing hypotheses regarding associations among rates of change. Cross-domain associations were evaluated in combined 75-year-old cohort samples from Denmark, Finland, and Sweden. In general, no consistent associations were found across sensory, balance, strength, and cognitive domains. These findings indicate that the effects of aging on sensory acuity, balance, and cognitive functioning are likely to be largely independent, multidimensional, and complex at the level of the individual. (PsycINFO Database Record (c) 2010 APA, all rights reserved)