By means of the afm made in shanghai aijian co . , ltd . and digital instruments co . , ltd ( u . s . ) , the dna strand and their fragments were observed successfully . 2 . by comparison with afm experiments of three categories of ion beams , the result has been observed in qualitatively : in the uniform dose , the higher let heavy ions have caused more double strand breaks than the lower let radiation 通过afm对实验结果的观测,可以定性地得知:在同等剂量条件下,高let值的重粒子与低let的射线相比, dna双链断裂的数目要多一些;在相同let条件下,随剂量增加dsb的片段变短、数量增加。
The programs of system are written with assemble language . in order to resolve the problem of signal jammed , not only we used hardware ( photo couplers , watchdog , special parts , etc . ) , but also used some arithmetic ( average , wavelet , etc . ) . after analyzing the deficiency of the popular mechanical instrument in motorcycle , this paper focuses on researching and designing the digital instrument . the developing work of ( the research of the led digital multi - parameters instrument in motorcycle ) has been finished and is being commercializing packaged 我们采用了专用的a / d转换器作为模拟量的测量,采用光耦器件作为车速、发动机转速信号的输入,采用高亮度的led器件作为在强光下显示器件,采用两个独立的微处理器以提高系统的可靠性,采用模拟条和数码管同时显示以符合驾驶人员的习惯,同时通过改进算法,实时处理车速和发动机转速与数据显示和数据存储等技术难点。
The design of high - voltage circuit based on pwm technology is briefly described . the closed - loop current control theory using analog instruments is fully discussed , followed which is that using digital instruments . it is an important part that the hardware and software design of the single chip - two arms and two chips - two arms current control circuits with a new chip applicable to digital current control system 简单介绍了基于开关电源技术的高压电路设计;详细讲述了模拟稳流电源的闭环稳流原理,并在此基础上讨论了利用数字电路实现稳流的原理及可能性;选择出适合数字稳流系统的新型芯片,完成了单片双路稳流系统、双片双路稳流系统的软硬件设计;给出了一种简单易实现的比例?积分控制程序。
According as the increasing requirement of ats , all kinds of bus develop at full speed . the cpci / pxi , vxi and lxi are preponderant in high - speed and high performance module instrument especially in digital instrument , but it is inaccessible to complex and traditional measurement equipments and instrument , such as microwave and rf measurement and test instrument , which still be tested by instruments with rack - and - stuck instrument 以cpci / pxi 、 vxi 、 lxi为代表的总线技术在高速、高性能的模块化仪器尤其是数字化仪器方面具有极大的优势,但对复杂的、传统的计量设备和仪器,如高性能的微波、射频计量测试仪器大多还无法完成模块化目标,在目前和今后很长一段时间内仍需使用台式仪器。
In the parameter measurement area , great technical progress has been made in analog instrument , digital instrument and intelligent instrument . after 1990 ' s , with extending of applied range of parameter measurement and improving of the control request , the original measurement technique could n ' t meet the increasing needs during the parameter measurement . the flying development of the information technology also brought fast progress to the measurement technique 参数测量领域先后经历了模拟仪器、数字仪器和智能仪器的充分发展, 20世纪90年代,随着参数测量的应用范围不断扩大,控制要求的不断提高,原有的测量技术已不能满足日益增长的参数测量需求,在同时期信息技术高速发展的带动下,测量技术得到了飞速发展,该领域进入了虚拟仪器阶段。