CMOS artificial subretinal chip for natural light illumination

A novel CMOS oscillating pixel array for subretinal prosthesis used in natural light illumination is presented. Its prototype chips are fabricated in a standard 0.6 /spl mu/m CMOS technology. Experimental results show the device can deliver effective self-oscillation for subretinal electrical stimulation.     

巷道最佳注浆加固时机的分析研究

对松散破碎以及软弱围岩巷道进行注浆加固巷道围岩时,注浆时机的选择对注浆效果具有很大的影响。有效地进行注浆加固的先决条件是浆液能够在围岩中均匀地流动渗透到一定范围,且注浆后能明显提高围岩强度和整体承载能力。在综合考虑围岩裂隙的发育程度、注浆加固体的强度、所需控制的围岩变形量及注浆工艺等因素的基础上,确定了最佳的注浆时机——滞后15d～25d。     

远洋山水居住区(西区)"九年一贯制"学校

远洋山水居住区（西区）的教育优势突出，在居住区的西南角规划设计了一所36班的“九年一贯制”示范学校。其中，小学部24班，初中部12班。该学校隶属于石景山教委，主要招生服务对象为远洋山水居住区（西区）和周边社区的居民。学校占地3.6ha，总建筑面积约23800m^2。     

一种基于LS的天线阵方向图综合算法

采用一种基于最小二乘理论的算法对阵列天线进行方向图综合,仅对旁瓣峰值和主瓣电平进行处理,可以实现旁瓣和主瓣电平的同时控制,使天线阵方向图向期望方向变化.算法可以对等间距和不等间距天线阵进行综合,计算量也较小,所以具有很强的实用性,仿真结果验证了算法的有效性.     

Morphology of intermetallic compounds formed between lead-free Sn-Zn based solders and Cu substrates

The morphologies of intermetallic compounds formed between Sn-Zn based solders and Cu substrates were investigated in this study. The investigated solders were Sn-9Zn, Sn-8.55Zn-0.45Al, and Sn-8.55Zn-0.45Al-0.5Ag. The experimental results indicated that the Sn-9Zn solder formed Cu₅Zn₈ and CuZn₅ compounds on the Cu substrate, while the Al-containing solders formed the Al_4.2Cu_3.2Zn_0.7 compound. The addition of Ag to the Sn-8.55Zn-0.45Al solder resulted in the formation of the AgZn₃ compound at the interface between the Al_4.2Cu_3.2Zn_0.7 compound and the solder. Furthermore, it was found that the cooling rate of the specimen after soldering had an effect on the quantity of AgZn₃ compound formed at the interface. The AgZn₃ compound formed with an air-cooling condition exhibited a rougher surface and larger size than with a water-quenched condition. It was believed that the formation of the AgZn₃ compound at the interface occurs through heterogenous nucleation during solidification.     

防御超强台风的实践与思考

超强台风具有巨大的破坏力,如何防御超强台风并降低其灾害损失是一重大课题。浙江省在防御“桑美”超强台风的实践中认为,要取得防台抗灾的胜利,未雨绸缪、常备不懈是基础,以人为本、有效避险是关键。同时,针对“桑美”登陆后暴露出的各种问题,今后还要从4个方面加强工作,即建立集中与分散相结合的避险体系;加强电力、通信等应急基础保障能力建设;全面建成监测预警体系;加强超强台风研究,进一步完善防台风预案。     

与商业比肩而行

“许多美术行为都是与商业客户相结合的。以商业的视角看待作品更重视在整个概念部分是不是能够从设计的观点很忠实地传达出商业诉求，并引起更大共鸣”。[编者按]     

新疆天然气产业发展思路研究

一 天然气产业发展现状 1、天然气资源勘探开发 最新评价结果表明，新疆三大盆地天然气资源量是10.42万亿立方米，其中塔里木7．96万亿立方米，准噶尔2．09万亿立方米，吐哈0.37万亿立方水．目前资源探明率为7％，说明新疆三大盆地依然具有较大的勘探潜力．是我国天然气重要的战略接替区。     

A physically based approach to granular media mechanics: grain-scale experiments,initial results and implications to numerical modeling

It is generally appreciated that the mechanical behavior of granular media depends fundamentally on the interaction of the constituent particles, and that the validity of numerical models of granular media would be greatly improved with knowledge of the grain-scale mechanics. However, most supporting experimental work has been conducted on highly idealized materials, and a limited amount of information exists on grain-scale force–displacement relationships for naturally occurring materials. To address this shortcoming, we are conducting a program that integrates laboratory experiments on grains of naturally occurring aggregate with the discrete element modeling method, with the goal of relating the grain-scale physical and mechanical properties of granular media to bulk behavior. The paper describes the equipment and methods that have been developed to conduct close-loop controlled, grain-scale experiments under monotonic and cyclic loading conditions, and presents results from an initial set of experiments on unbonded grains. The implications of the grain-scale results to the discrete element model are discussed. Discussions center on the applicability of a physically based approach to the mechanics of granular media in general. In light of future exploration missions and the resulting need to predict the mechanical properties of lunar and planetary regoliths, the paper examines the potential usefulness of our physically based approach to the problem of predicting the behavior of the types of materials found in those environments.