高灵敏度的

Through the cooperation between the fast peak detector and the delay unit,the receiver is realized with lower BER, bettter receiver sensitivity and receiver dynamic range. The output NOR gate can cancell the unwanted peak in dead spaces between packet signals.

采用前馈式结构，通过快速峰值检波电路和延时单元的协同工作，使该光突发模式接收机具有：更低的误码率、较高的接收灵敏度、又有大的光接收动态范围；在输出端采用特殊的或非门技术，消除了干扰。

Using simulations, we found the best geometry of the collimator is the one with a rectangle aperture and all of them are placed in two groups with an orthogonal orientation, which will have good resolution and sensitivity, and also be easy to manufacture. The rectangle aperture gives good imaging accuracy along the short side, and wide viewing along the long side. The orthogonal orientation for collimators will allow us to observe the source and the background simultaneously.

通过模拟发现，综合考虑了对强源成像的分辨率以及对弱源的灵敏度，以及加工的容易程度，论文提出了最优的准直器设计方案是用长方形准直器，并且将所有准直器分成两组，垂直摆放，一方面可以约束两个方向上的成像质量，同时具有较高的成像分辨率和定位精度，并且非常利于定点观测时的源和本底同时观测。

The method of using formaldehyde buffer solution a b sorption-hydrochloric pararosaniline spectrophotometry to determine sulfur diox ide in air has higher sensitivity and good selectivity,and prevents from adoptin g mercurial absorbent.But the conditions in lab are not well controlled,the v alue of reagent blank and standard curvilinear slope can't accord with the one s tipulated in"Methods for Air and Waste Gas Monitoring and Analysis".Some opra tional techniques for SO2 determination in lab are introduced for reference.

文摘：以甲醛缓冲溶液吸收-盐酸副玫瑰苯胺分光光度法测定空气中的二氧化硫，方法灵敏度高，选择性好，避免了使用含汞的吸收液，但如果实验条件控制不好，试剂空白值及标准曲线的斜率就会不符合《空气和废气监测分析方法》中规定的值，本文着重从操作技巧方面对二气化硫测定的实验室质量控制进行分析，仅供参考。

According to this method,four different 11-step algorithms with four different window functions which are rectangular window,triangle window,hanning window,and blackman window are designed. Analysis and simulation show that hanning window and blackman window with small lobes are less sensitive to errors. Seven different algorithms with the same phase shifting interval π/2 are designed by hanning window function,whose phase shifting steps are separately 5,11,15,39,51,76 and 101 steps.

选择矩形窗、三角窗、hanning窗和blackman窗生成4种11步移相算法，对振动误差和相移误差的分析验证了旁瓣小的hanning窗和blackman窗生成的算法对误差的灵敏度要小；再选择hanning窗生成了移相间距为π/2的5，11，15，39，51，76和101步7种移相算法，仿真验证了步数越多主瓣越小，对振动抑制能力越好，但需要更高的微位移器移动精度来获得有效的干涉条纹。

The principle,fabric and characteristic of the dispersive intelligent liquid turbid degree apparatus which use the dispersive method is introduced. And it indicates by the result of actual experiment, that the apparatus has upper precision and statoscope in lower turbid measure comparing with the traditional transmissive liquid turbid apparatus. At the same time, it uses intelligentized technology in its disposal and display parts, not only does it enlarge the range of measure and enhance the anti jam...

介绍了采用散射法设计研制的散射式智能液体浊度仪的原理、结构及特点，并通过实测结果表明，该仪表与传统的透射式液体浊度仪相比，在低浊度测量时具有较高的精度和灵敏度，同时该仪表在处理和显示部分采用了智能化技术，不仅可以对信号进行加工处理，扩大测量范围，提高抗干扰能力，而且还可以增加测量数据的打印记录和远距离传送等功能。

The second advantage is that globose targe is the most sensitive to variety of coal powder concentration In the experiment, a testing piping system for coal powder and air two phase flow was built in laboratory. Experiment adopt disk target and spherical target two kinds of target.

将两组试验数据拟和得到的空气单相流关系式的斜率与两相流关系式的斜率进行比较，球形靶试验数据拟和公式的斜率较大，说明球形靶确实比圆片靶对两相流粒子浓度的反应灵敏度高。

Based on the work thereinbefore,an electronic nose system was designed and dimension of thesensorprepared using single chip microprocessor,which has been used successfully to classify and recognize three kinds of gasoline and five kinds of distilled spirit

其中，提出了一种新的信号调节电路，可以在气敏传感器电阻的动态范围内获得较高的灵敏度。在电子鼻系统中，采用一种新的流气式进样系统，可以保证进样过程的重复性，为记录和利用传感器阵列的动

The background of protective relaying based on travelling wave for transmission lines is introduced and its development at home and aboard is reviewed.

0引言全国高压、超高压输电线路的不断扩建及特高压线路的试建，大容量机组的陆续投运，全国电网的互联对电力系统继电保护的动作速度、可靠性、灵敏度等指标提出了更高的要求。

Take Pb〓 as an example, its detection limit is 8×10〓mol/L. The research on mechanism of this method shows that these achievements was caused by the characteristics of silver disc electroxidation and electroreduction and ACOC.

对该法的机理做了较深入的探讨，表明该方法灵敏度高、稳定性重现性好的原因是银盘电极的氧化还原性质和交流示波计时电位法的特点共同所致。

The infrared photoacoustic spectroscopy was also introduced as a new spectral technique which was based on the absorption of electromagnetic radiation by soil samples, it is very feasible to study soil system, which is complex and nontransparent. It can overcome the disadvantages of traditional transmission and reflection spectral techniques, and has great potential in application with its celerity, convenience, high sensitivity and accuracy.

同时本文探讨了基于光声效应的红外光声光谱技术，红外光声光谱非常适合用于土壤这种复杂、非透明体系的研究，能够克服传统透射和反射光谱中存在的缺陷，测定快速方便，并具有较高的灵敏度和测量精确度，具有很大的应用潜力。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐