摘要：A transient three-dimensional（3 D） model was established to understand the bubble motion in an industrial electrolytic process. An anode with a new design was tested. It incorporates two slots that allow an efficient removal of gas bubbles. The electromagnetic fields were described by solving Maxwell＇s equations. The bubble movement was studied with two-way coupling Euler-Lagrange approach. The interplay of current density and bubble nucleation rate was included. The collision and coalescence of bubbles were considered. Random walk module was invoked for involving the chaotic effect of the turbulence. The numerical results were validated by experimental measurements. The results indicate that the current distribution and the bubble nucleation periodically change. Due to the slot, the bubble elimination heavily increases. The contribution of the slot to the bubble removal exceeds 50% in the case of three currents, and the promotion of the slot decays with increasing the current.

摘要：The bleed slot is necessary for the requirement of the hypersonic quiet flow all over the world. The aim of the bleed slot is to decrease the influence of the disturbances from the contraction of the quiet nozzle to the boundary layer downstream of the throat, so that the boundary layer of the nozzle could be maintained as laminar flow. The main parameters of the bleed slot include the distance from lip to throat (DLT) and the width of slot (WS). Various values of those parameters will affect the performance of the slot by changing the suction intensity of the bleed slot. Two kinds of the bleed slots in the world are compared in this paper and the aerodynamic design of the bleed slots is optimized based on the Purdue-type slot. The influences of the various values of those parameters to the flow field around the throat are analyzed and the optimizing results of DLT and WS are consistent with those relative data designed for the slot of the Boeing/AFOSR Ma 6 Quiet Tunnel.

摘要：This paper presents the design of a small printed ultra wideband antenna with Band Notched characteristics. Both the free space and on-body performances of this antenna were investigated through simulation. The newly designed UWB antenna is more revised small form factor sized, with the ability to avoid interference caused by WLAN (5.15 - 5.825 GHz) and WiMAX (5.25 - 5.85 GHz) systems with a band notch. The return loss response, gain, radiation pattern on free space of the antenna were investigated. After that, the on-body performances were tested on 3-layer human body model with radiation pattern, gain, return loss, and efficiency at 3.5, 5.7, 8, 10 GHz and all the results were compared with free space results. As the on-body performance was very good, the proposed antenna will be suitable to be used for multi-purpose medical applications and sports performance monitoring.

摘要：Observer模式是一种有着广泛应用的设计模式。在代码中实现他需要做大量的工作。一个好的框架可以极大地简化这个过程。但现有的几种基于C++的框架,要么使用比较复杂,要么参数的类型或个数受到限制,或者要求对语言本身进行某种扩展。所提出的框架,在完全遵循C++标准的情况下,对上述不足进行了彻底的改进,使得Observer模式在C++中的应用变得相当容易。

摘要：开源硬件掌控板和各类传感器结合的物理实验可以实现数据的精确测量。很多物理量取值是连续变化的,本文基于模拟信号传感器结合掌控板物联网技术设计斜面探究实验,将传统的物理实验结合开源硬件及物联网技术做出新的尝试,能让数据可视化。在设计制作本实验过程中,结合创客教育与STEM教育理念,实现跨学科学习,更有趣的研究,更精准的实验。

摘要：K7:AMD的未来之星 K7是Intel不再授权给其他制造商生产P6兼容产品后,AMD自行设计的第一个不兼容于Intel芯片的处理器,同时K7也是AMD首次进军高端桌面电脑与工作站领域的高性能处理器,其成败是AMD未来市场发展的关键。K7的技术特点如下: 1.高速的CPU总线:K7并不兼容于Intel的slot1或slot2,它使用的不是Intel的P6 GTL+总线协议,而是原DEC公司的Alpha总线协议EV6。EV6架构采用多线程处理的点到点拓扑结构,支持200MHz的总线主频。