勃朗宁Buck Mark射击比赛用手枪

Buck Mark是著名的勃朗宁手枪的一个子品牌,有不少经久不衰的型号。Buck Mark主要的型号都是发射0.22LR运动枪弹的民用枪,在市场上一向享有较好的声誉。这款特制战术级的射击比赛用手枪展现了勃朗宁公司无可挑剔的加工工艺和令人信服的制造水准,堪称该型手枪的精品。     

用可变分辨率ADC技术提高DDM的测量精度

1998年,美国国家仪器(NI)将分辨率可变的ADC(FlexADC)技术用于高性能的数字化仪PCI-5911中。这项产品可以测量从直流到100MHz的信号,分辨率从8位到21位,取决于测量的速度。利用这项产品,用户可以根据对速度/噪音的具体要求,自行确定测量方案,用不着去控制存在局限性的多台数字化仪。现有的A/D转换器的噪音、线     

5V转换成-10V的简单电路

典型开关式电容器充电泵不需要电感器，因此容易设计．且能将正电压加倍及将正电压转换成一个等效负电压。但在某些应用中．只有正电源可用．且电源系统必须产生一个幅度比正电源电压幅度更大的负电压。图1所示电路可将其输入电压反相的同时将所得负电压加倍。     

Approximate Graphic Method for Solving Fermi Level and Majority Carrier Density of Semiconductors with Multiple Donors and Multiple Acceptors

In this work we present a generic approximate graphic method for determining the equilibrium Fermi level and majority carrier density of a semiconductor with multiple donors and multiple acceptors compensating each other. Simple and easy-to-follow procedures of the graphic method are described. By graphically plotting two wrapping step functions facing each other, one for the positive hole-acceptor and one for the negative electron-acceptor, we have the crossing point that renders the Fermi level and majority carrier density. Using the graphic method, new equations are derived, such as the carrier compensation proportional to NA/ND, not the widely quoted NA – ND. Visual insight is offered to view not only the result of graphic determination of Fermi level and majority carrier density, but also the dominant and critical pair of donors and acceptors in compensation. The graphic method presented in the work will help guide the design, adjustment, and improvement of the multiply doped semiconductors. Comparison of this approximate graphic method with previous work on compensation, and with some experimental results is made. Future work in the field is proposed.     

Efficient implementation of 3D filter for moving object extraction

In this paper the design and implementation of Multi-Dimensional (MD) filter, particularly 3-Dimensional (3D) filter, are presented. Digital (discrete domain) filters applied to image and video signal processing using the novel 3D multirate algorithms for efficient implementation of moving object extraction are engineered with an example. The multirate (decimation and/or interpolation) signal processing algorithms can achieve significant savings in computation and memory usage. The proposed algorithm uses the mapping relations of z-transfer functions between non-multirate and multirate mathematical expressions in terms of time-varying coefficient instead of traditional polyphase de- composition counterparts. The mapping properties can be readily used to efficiently analyze and synthesize MD multirate filters.     

中意葡萄酒之文化差异

意大利葡萄酒是目前世界上拥有几方面“得天独厚”条件的“上帝之液”。它们计有： 源自六千多年酿酒工艺（从中东一带如黎巴嫩,以色列以至罗马帝国世代相传的遗物）当今全球葡萄酒产量最大和产区及品种最多的旧世界酿酒国（大小产区分别为21个及300多个,     

帅哥到底有多帅？

上铺的小帅哥本来就是个自恋狂，再加上那堆小女生成天围在他身边大献殷勤，宠得他越发忘形，真就以为自己是天上有，地下无的超级无敌大帅哥了。宿舍里住着这么个人 ，谁受得了？哥儿几个一合计，一定要好好治治他。法宝嘛，自然是这个容貌评分网站：http：//www．facebeautyrank．com.     

电力驱动装置三阶段速度图最有利的参数

三阶段梯形速度图(图1)的参数有:角移β;最大速度ω_M;起动和制动的加速度ε_p和ε_m;起动时间t_p;制动时间t_m,和全移时间t_n.当给定了机械性能和恒定的位移,即给定了β、t_n和合闸持续率(nσ)时,均方根转矩以及要求电动机的容量仅与ω_M、ε_p和ε_m参数有关.加速度的最小值相当一个三角形速度图(图1),由图可得     

ЗКП型聚能药包现代化的结果

本文介绍了原苏联暨今俄罗斯自１９６８年开始研制和使用聚能药包的简单沿革，批量产品的技术性能，使用情况和存在问题，论证了现代化聚能药包的基本方向，并据此进行了改进，对改进型聚以药包的结构原理、规格性能和加工技术条件作了说明；改进型聚能药包已在斯托伊连采选公司和“沃兹涅先卡”露天矿进行了验收工业试验；建议批量生产ЗКП－Ｍ和ЗДП型聚能药包。