实验

Combining the experimental results and theoretical analysis, the following work has been accomplished.(1) Reasons of the decrease of interelectrode capacitance and the increase of discharge gap caused by the powder suspended in dielectric fluid are explained. And the mechanism that surface quality of workpiece improved by powder-mixed EDM is analyzed from this viewpoint.(2) The variation regularity of the percentage of silicon on the machined surface of workpiece has been summarized according to the experiment results when silicon powder was added into the working fluid. The entropy is introduced to explain the reasons for this variation regularity by thermodynamics.(3) The dimensional accuracy is greatly influenced by the overcut resulting from discharge gap and electrode wear in practice application. Empirical formulas for the overcut in EDM and powder-mixed EDM are established based on the experimental results using the ternary linear regressive method in this paper.(4) The influence of main factors on the machined surface characteristics has been evaluated based on the orthogonal experimental design method.

通过一系列普通电火花加工与混粉电火花加工的对比实验，运用工艺实验和理论分析相结合的方法，重点做了以下工作：(1)探讨了粉末颗粒导致极间电容减小、放电间隙增大的原因，并从这个角度解释了混粉电火花加工可以改善工件表面质量的机理；(2)以混合硅粉的电火花加工为例，实验得出峰值电流和脉冲宽度对加工表面层成分中硅元素含量的影响规律，并引入熵的概念从热力学的角度对硅元素含量变化的原因寻找了理论依据；(3)在实际加工中，由于粉末的加入使放电间隙变大，这使得混粉电火花加工的尺寸精度难以控制，本文利用三元线性回归的方法，在实验数据的基础上，建立了两种电火花加工过切量的计算公式；(4)将正交试验法应用于混粉电火花加工实验研究，并通过对实验指标极差的直观分析，得出各电参数对加工指标影响的敏感程度。

According to local resources linking with the reality of teaching in analytic Chemistry experiment, the au lay the reform plan of teaching in analytic chemistry experiment and suggest to classify the course of analytic chemistry experiment.

结合资源，联系分析化学实验教学现状，提出了分析化学实验教学的改革计划方案。主张将分析化学实验课程分为三个层次：基础分析实验———实际应用型实验———知识创新型实验

For contrast experiments, k-means and DBSCAN algorithms are also implemented using Visual C++ 6. 0. We conducted a series of experiments, including the experiment of the correctness of clustering and outlier detection, the experiment of the precision of clustering and outlier detection. The experiment of the runtime, the experiment of the effect of clustering and outlier detection on parameters, the experiment of the impact of clustering and outlier detection precision by the order of data input, and the experiment of the effect of the algorithm validness by the density character of dataset.

本文使用Visual C++ 6.0实现了基于距离的聚类和孤立点检测算法、k-means算法和DBSCAN算法，做了大量的对比实验，包括聚类算法和孤立点检测正确性实验；聚类算法和孤立点检测精度实验；算法执行时间实验；参数对聚类和孤立点检测结果的影响实验；数据输入顺序对算法聚类和孤立点精度的影响实验；数据集密度对算法有效性的影响等。

The animal experiment state in teacher and student of school of college of article go to a doctor and scientific research makes one brief analysis, how to establish unified animal test a few proposals that communal technology serves platform to publish his. The animal of experiment of analysis of animal experiment state in education of class of 1 medicine foundation and animal experiment are system of the main content with medical zoologic experiment and relevant theory.

本文就医学院校教学和科研中的动物实验状况作一简要分析，并就如何建立统一的动物实验公共技术服务平台发表自己的一些建议。1医学基础课教学中的动物实验状况分析实验动物和动物实验是医学实验动物学的主要内容和相关理论体系。

The advantaging and default of the traditional experiment and the virtual experiment was analyzed. an experiment mode was put forward which combine the traditional experiment and the virtual experiment to improve the students' practice abilityand innovation consciousness. the teaching effect is well improved.

分析了传统实验和仿真实验的优缺点，提出了将传统的实验教学与基于ewb平台的仿真实验相互结合，建立综合开放性的实验教学模式，全面培养学生的动手能力，激发学生的创新意识，提高了教学实验质量。

First, the background spectrum is subtracted from experimental one; Second, by the spectrum stripping, the counts came from partial energy deposition of incidence photon in HPGe crystal, such as Compton scatting or pair production; the next, transform the experimental spectrum to the incidence photon flux spectrum.

实验数据的处理过程有三步：1 从实验谱中减掉本底谱；2 实验谱中分离掉各种能量的入射光子在晶体中的部分能量沉积(康普顿散射、电子对效应)：3 处理过的实验谱转成入射光子通量谱。比较结果显示，在本实验中，模拟谱对实验谱的总计数相对偏差不大于20%，两者基本符合。

This paper questings mode and practice of physics experiment in engineering university, persistting scientific quality , creativity and experiment ability to educate as core,enhance the foundation experiment, and to make use of the thought method about the science research, outstanding experiment design thought, and to right handle the spreading of knowledge , conversion and creative relation;and to make a point of the student independence experiment ability and creativity ability educated , it has significant mean to all-out push forward the quality education, and to educate the creative type talented person of having to compete the ability,and to speed up the innovation procession of engineering physics experiment.

本文探索的工科物理实验教学模式，坚持以学生的科学素质、创新能力和实验能力培养为核心；加强基础实验，运用科学研究的思维方式，突出实验设计思想，正确处理知识的传承、转化和创新的关系；注重学生独立实验能力和创新能力的培养，对全面推进素质教育、培养和造就具有竞争能力的创新型人才、加快我国工科物理实验教学改革的进程具有重要意义。

Experimental results disclosed that the upper limit on the photon mass was 1.2×10-51g, and this figure, collected by Particle Data Group in 2004, has improved almost 20-fold compared with that of the static torsion balance experiment.

该数值不仅将国际上扭秤静态实验结果提高了约20倍，而且调制的实验方法还有效地克服了扭秤静态实验中实验结果对宇宙磁场矢势与地球自转轴之间夹角的依赖关系，并且极大地抑制了各种周日背景干扰的影响，提高实验的置信水平，该实验结果于2004年被国际粒子物理数据组收录。

Parallel interface achieve the data transmission between bit and I/O devices using more than one data wire, which is suit for short distance transmission. Come to a direct display of its functionalities with VC virtual platform by visual design.Data and code in every computer parts, describes itself by combination, the function is invisible.

然而，目前在计算机实验教学中，由于实验仪器复杂，精密和昂贵，往往不允许自行设计实验参数，反复调整仪器，这对剖析仪器性能和结构，理解实验的设计思想和方法是很不利的，在本次设计中主要应用了VC实验平台来进行仿真实验。

This paper points out that research orientation of chemical experiments mainly focuses on its simplification, improvement, innovation, miniature, green chemical experiments, and the self-making of common chemical reagent.

文章指明了化学实验研究方向主要是化学实验的简约化、实验的改进与创新、微型实验研究、绿色化学与实验的研究、实验常见试剂的自制方法研究。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。