摘要：To make the Kaplan turbine technology comparable to both the Pelton and the Francis turbine,the master equation for the Kaplan turbine has been established by analyses similar to that-for the Francis *** analysis begins with the descriptions of free vortex flows at the runner inlet and the swirl flow at the impeller *** considering the Euler equation for specific work and by further evaluating the most significant shock and swirling losses,the first and the second energy equations in the form of hydraulic efficiency were *** master equation is then established by combining both energy *** addition,three design equations and a new design parameter are *** master equation relates the turbine hydromechanics to the geometrical design of both the runner and the guide-vane *** enables the complete hydraulic characteristics of a given Kaplan turbine to be analytically and simply computed.A computation example demonstrates the functionality and applicability of the *** the reconstructed master equation,the runaway speed of the Kaplan turbine and its dependence on the guide-vane setting can be easily and precisely *** bulb turbines with guide vanes directly ahead of the turbine runner in the same tube,all computations are also applicable using another equivalent control parameter.

摘要：This paper presents an improved method for design of CMOS comparator based on a preamplifier-latch circuit driven by a clock. Design is intended to be implemented in Sigma-delta Analog-to-Digital Converter (ADC). The main advantage of this design is capable to reduce power dissipation and increase speed of an ADC. The design is simulated in 0.18 μm CMOS Technology with Cadence environment. Proposed design exhibits good accuracy and a low power consumption about 102 μW with operating sampling frequency 125 MHz and 1.8 V supply. Simulation results are reported and compared with earlier work done and improvements are observed in this work.

摘要：This paper proposes the current search (CS) metaheuristics conceptualized from the electric current flowing through electric networks for optimization problems with continuous design variables. The CS algorithm possesses two powerful strategies, exploration and exploitation, for searching the global optimum. Based on the stochastic process, the derivatives of the objective function is unnecessary for the proposed CS. To evaluate its performance, the CS is tested against several unconstrained optimization problems. The results obtained are compared to those obtained by the popular search techniques, i.e., the genetic algorithm (GA), the particle swarm optimization (PSO), and the adaptive tabu search (ATS). As results, the CS outperforms other algorithms and provides superior results. The CS is also applied to a constrained design of the optimum PID controller for the dc motor speed control system. From experimental results, the CS has been successfully applied to the speed control of the dc motor.

摘要：Using a driving simulator,the effects of Chinese chevrons on drivers’actual and perceived safe speeds at horizontal curves on two-lane rural highways are tested. Twelve horizontal curves with different roadway geometries are designed and used as the simulated *** results show that, regardless of the curve radius, chevrons at horizontal curves provide advance warning and speed control for vehicles on the nearside of ***,chevrons can be used as an addition to speed limit signs in preventing excessive speed at horizontal curves and, therefore, can contribute to a reduction in run-off-road ***, Chinese chevrons can also serve to provide an improved sense of safety while driving around sharp *** study results lay a foundation for setting Chinese chevrons more reasonably.

摘要：In measurement system by means of pulse laser, such as plasma measuring, laser ranging, the amplitude of echoed laser wave is very weak and difficult to detect by traditional analog electronic technology. A digital high speed data acquisition and processing system was designed to meet the accuracy requirement. It adopted high speed AD chip and advantage FPGA chip as core unit. Experiment results have verified this system can reach to 1GHz sample rate and can catch weak echo wave effectively and the measuring accuracy is improved markedly.

摘要：蓝牙耳机自问世以来一直备受消费者的喜爱，它不仅让用户免除了电线的牵绊，而且使用起来更轻松自在，已成为必不可少的手机伴侣。本期《消费电子》评测室迎来了著名创意数码品牌iLIKE最新推出的两款蓝牙耳机iLIKE speed Metal和iLIKE 融合。这两款蓝牙耳机颇具特色，一款造型精致，一款创意十足，而这两方面恰恰是消费者选择蓝牙耳机的重要标准。现在就一起来体验一下这两款特色蓝牙耳机吧。

摘要：Ferretti 500的设计，是在“品质第一”的前提下，从一系列“参数和必要的需求之间寻求完美的平衡点。“我们的船是用来感受生活的，而不仅仅是用来炫飘的。”这是Ferretti500的设计理念，也是其“为海而生”的海洋哲学。

摘要：为了研究应激状态下的驾驶员行为,提出了一种驾驶员应激响应分析系统。硬件系统以罗技赛车方向盘为基础并进行相应的机械改造,软件系统采用speed Dreams引擎创建典型应激场景;采用Joystick监控方法以及多线程通讯技术,高速动态采集并记录驾驶行为。对采集数据进行滤波、去噪、微分等处理和分析后,得出驾驶员的应激响应时间及数据间的相关规律。该研究成果可以为应激状态下的驾驶员行为研究提供可靠的数据支持。

摘要：＂往往一辆概念车的问世都会伴随着这个品牌最前沿的设计思想和科技水准,体现出其产品的发展方向,而在宾利EXP 10 speed 6身上,我们既可以感受具有传奇色彩的历史气息,也可以阅读出当下主流的设计精髓,更能够触及到未来的前沿理念。＂诸如宾利这样的顶级品牌一贯处在被人们仰视的地位,不仅仅是因为其昂贵的售价,更重要的是其能够赋予我们一种独一无二的奢华体验和极具匠心的细节感受。

摘要：2016年的欧州杯已经结束，阿迪达斯在欧洲杯期间主推的水银套装无疑是这届大赛上的明星系列，其鬼魅的身影帮助众位球星在球场上取得了不俗的表现。而套装的三双鞋款本身就是很不一般的鞋款，无鞋带或隐藏鞋带的设计是革命。12的存在，多种顶尖科技加持让其性能也是很优异，电镀大底的设计更是为鞋款增色了不少，而紧接着这一水银套装，阿迪达斯在这三双鞋款的基础上又推出了全新的speedo f Light Pack，用光速来迎接新赛季的到来。