Based on the theory mode , the delay time between the beginning of optical illumination and the onset of lock - on switching was calculated , and the transiting speed of electrons , the traversing velocity of the current filament , was obtained as well . the calculated results matched well the experimental results . taking advantage of the ultra - fast response characteristics of the devices , si - gaas pcss ' s are successfully applied to the broadening test of nanosecond laser pulses 应用单极电荷畴模型数值计算了lock - on效应的光、电时间延迟和载流子的渡西安理工大学硕士学位论文越速度（丝状电流穿越开关间隙的速度） ，所得计算结果与实验测试结果基本吻a利川半绝缘gaas光屯导开关的超快光l匕11向应灯性，成功地应川下纳秒激光脉冲展宽试验中，证明了开关可厂泛应川在超快光电响应和光电反馈网络中。
It is necessary to construct a subsystem , orgnizational system , social service system , macromanagement system , technique system and human resource development system . it adopts seven main promotive models , the science - research - base model , new & high - tech industrial park model , enterprise technology centre model , industrial technology development centre , engineering research centre model , science - research - production union model , and teconology plan model . it also utilizes the fo llowing eight policies in struments synthetically : tax policy , finance policy , governnent purchase policy , intellectual property rights protection policy , promoting the development of msb , human resource development and management policy , promoting the dovelopment of social service system policy , and industry policy 建设多元化、高度开放的组织系统，门类齐全、功能活跃的社会服务系统，高效率、间接调控的宏观管理系统，多层次、阶段递进的技术系统，以职业技能开发为起点，以创造力开发为目标的人力资源开发系统等五大子系统，采取科研基地模式、高新技术产业开发区模式，企业技术中心模式、行业技术开发中心模式、工程研究中心模式、科研生产联合体模式、科技计划模式等七大推进模式，综合运用财税政策、金融政策、政府采购政策、知识产权保护政策、促进中小企业发展政策、人力资c庙二工会匕汐一召朴伞一二仕山人8日食《玄啃鼠析笨本小析竿《 ， d杯刀又刁” b七三从斤一、 i人工七丁。
By comparing between the rectangular groove and curved groove , we find that two high stress area of rectangular groove o - ring occurs during the sealing period , and the wearing on the both inside and outside diameter surfaces ; the high stress area only happens at the part area of cone shaft , and the distribution of stress is more even than the former , and the wearing is on the inside diameter surface , the improvement of its distortions makes the service life of sealing lengthen 通过矩形槽和弧形槽的对比研究发现，矩形槽o形圈在密封过程中出现两个高应力区，磨损发生在内径、外径两个表面_匕，弧形槽o形圈的高应力区仅出现在牙爪轴邻近的局部区域内，应力分布较前者更为均匀，磨损进发生在内径表面，其受力变形状况的改善将使密封寿命进一步提高。
Some researches about frequency doubling are made , and two methods to improve intensity of second frequency generation are given . we realized q - switched 532 nm laser , by using nd : gdvo4 as laser crystal , using cr4 + : yag as saturable absorber , using ktp as intra - cavity frequency doubling crystal . average power of 109mw , repetition of 40khz , pulse width of 30ns , pulse energy of 2 . 6uj , peak power of 91w are obtained 4 .对倍频理论进行研究和分析:讨论两种提高二次谐波功率密度的方一法;实验匕在国内首次实现ld端面泵浦nd : gdvo4 / ktp ，用cr4 + : yag作为可饱和吸收片的绿光激光器，腔内倍频得到了平均功率为109mw 、重复频率为40khz 、脉宽为3ons 、单脉冲能量为2 . 6闪、峰值功率为glw的调q绿光输出。
The research results are as follows : ( 1 ) with the increasing of the height to the ground , the value of co2 concentration in air become adding ; the depth of soil profile more deeper , the value of co2 concentration in soil more higher . ( 2 ) the temperature in the sample area , which is with high elevation , is higher than the temperature in the sample area , which is with low elevation 通过研究发现： ( 1 )两不同海拔高度上的样地内大气co _ 2浓度值均具有随距地表高夏季金佛山垂直自然带匕岩溶生态系统内co :动态的研究度的增加而减少的趋势;而土壤空气中的c0 :浓度值多具有随土深增加而增大的趋势。
