原理

Teaching purpose and task: Pass the study of this course, can make the student's basic knowledge system to the electronic commerce and the basic frame of the electronic commerces have a mostly of understanding;Control is mainly basic principle, basic operation method that aims at the course, request can the exactitude appreciate among them basic principle, to the basic operation method can in prescriptive time the exactitude complete,The point control is the important concept, idea, theories and methods for aiming at electronic commerce is, request can combine the example in the actuality to take into the application, and can put forward own standpoint, request to can synthesize the usage at the same time

目的任务：通过本课程的学习，可以使学生对电子商务的基本知识体系和电子商务的基本框架有一个大致的了解；掌握主要是针对课程的基本原理、基本操作方法，要求能够正确领会其中的基本原理，对基本操作方法能够在规定的时间内正确完成；重点掌握是针对电子商务中的重要概念、观念、理论及方法，要求能结合现实中的例子加以应用，并能提出自己的观点，同时要求能够综合运用。

The experiment results show that the theoretical analysis and design method have correctness and two convertors have satisfied the design targets.

依据以上原理和方法完成了两级电路的硬件设计，通过实验结果，一方面证明了以上原理分析和设计方法的正确性；另一方面也证实了两级电路的硬件设计基本满足要求。

This paper summarizes the development and foundational principle of ultrasonic detections. Then it presents the theory and characters of ultrasonic sensor.

论文概述了超声检测的发展及基本原理，介绍超声波传感器的原理及特性。

In process design, the conventional epitaxial process is abandoned and then a novel BCD process is introduced.

在电路设计中，本文首先阐述了一个完整的电源管理系统原理和功能，然后简要介绍了部分子电路的功能原理。

Firstly, aiming at the problems existed in former models, with isotropic elastic damage exampled, based on strain equivalent principle, a novel failure process model is developed and formula for calculating rock failure critical value is also presented.

首先，针对前人模型存在的题目，以岩石的各向同性弹性损伤为例，根据最小耗能原理在应变等效原理条件下提出了一种新的损伤演变模型，克服以上模型存在的题目，同时也给出了岩石损伤临界值的计算公式，并对三向应力作用下做了简单的探讨。

How to decide atomic ground state problem has been studied based on lowest energy principle, Hund rule , and Pauli exclusion principle. It is summarized to two methods.

摘要以能量最低原理、洪特定则和泡利不相容原理为依据，对原子基态的确定问题进行了研究，得到了公式法和图表法两种确定原子基态的方法。

In 1945, he received the Nobel Prize in Physics for his "decisive contribution through his discovery in 1925 of a new law of Nature, the exclusion principle or Pauli principle."

泡利不相容原理可能是他最重要的成果了。这个原理说任何两个电子无法占据同一量子状态。自旋的主意是泡利与拉尔夫·克罗尼格一起提出了。

The system theory of three stages type feeding material was put forward,and the implementation methods of feed hopper, variable and quick speed feeding material were emphatically elaborated.

从重力称重式充填机加料方式的角度探讨其对充填精度与速度的影响机理，分析了常见重力充填机的工作原理与存在问题，提出了三段式加料系统原理，着重阐述了加料斗加料和变速快加料的实施方法。

Section 1 discusses the advantages of medical film printer and USB, and put forward one elementary design scheme of the system. The principle of laser printer and the holistic design scheme of system are presented detailedly in Section 2, while Section 3 expounds the technology of USB. Section 4 discusses design scheme of transfer system of the laser printer - includes the development of USB device and CPLD. The test of holistic laser printer and effect picture of medical image are presented in Section5. In the end, a review of this system and some bugs are put forwards at present.

本文主要分为六个部分，第一部分讨论了医用胶片打印机和USB总线技术的特点和发展趋势，并提出了系统的初步设计方案和研究意义；第二部分描述了医用激光胶片打印机的背景、工作原理和系统的各个组成部分；第三部分描述了通用串行总线2.0版(USB2.0)的通信原理；第四部分详细介绍了打印机数据传输系统的设计——包括USB设备的开发和CPLD的硬件和软件设计，并对这个传输系统的性能进行了分析；第五部分介绍了整个打印机的测试结果和实际打印医学影像的效果图；最后对本文做出总结并提出了不足之处和参考价值。

Principle of flame arresters, flame arresters standard feature of flame arresters, flame arresters, flame arresters size, flame arresters using advanced foreign technology, fire, flame arresters is the role of the Flame Cuanru there are external to prevent flammable The explosive gas, pipeline or to stop the flames in the equipment, the spread between the pipes.

阻火器原理，阻火器标准，阻火器特点，阻火器作用，阻火器尺寸，阻火器采用国外先进技术阻火器原理，阻火器标准，阻火器特点，阻火器作用，阻火器尺寸，阻火器采用国外先进技术，防火器，阻火器的作用是防止外部火焰窜入存有易燃易爆气体的设备、管道内或阻止火焰在设备、管道间蔓延。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。