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A numerical method is gived to distinguish that a Petri net is a time charac-teristic nets or not.The time characteristics of transmit are discussed and the density formula of transmit is given. stochastic petri nets ; time characteristic ; distractive matte

一般情况下，随机Petri网现有的分析方法大多是假定变迁的发射时间服从负指数分布，然后将网标识过程等价于连续参数马尔可夫过程，然后利用求解马尔可夫过程的一套数学方法来分析Petri网的时间特

Fly network: lens technology net of seihan, the normal exposure insertreleased NET, supplementary short exposure to increase the contrast.

飞网：镜头制版的挂网工艺，正常曝光後取下挂网，补充短暂曝光增加反差。

The results show that the gabion meshes present good tensile characteristics in the event of the rupture of the meshes. The larger-diameter gabion mesh shows a better mechanical performance, and the mechanical performance of 80RE geogrid is superior to that of 70RE geogrid. The revised relationship curves between the tension per unit width and unit elongation also present elastic stage, yield stage and strength stage. The constraint deformation of reinforcement is influenced by factors such as secant modulus of materials, stress levels, and the length of reinforcement in active area and stable area.

结果表明，格宾网在发生钢丝断裂之后仍呈现出较强的抗拉性能，大直径格宾网体现出优越的力学性能；80RE土工格栅的力学性能优于70RE土工格栅；修正后的格宾网的单位宽度拉伸力与伸长率的关系曲线仍呈现弹性、屈服和强化3个阶段；在约束条件下，筋带的变形量与筋带的割线模量、应力水平、筋带在加筋体中主动区和稳定区的长度等因素有关。

For reducing boundary distortion area, the elevations of grid DEM are viewed as a discrete sequence under a generalized coordinate, so that the boundary problem of two-dimensional discrete wavelet transform is turned into the boundary problem of one-dimensional discrete wavelet transform, which not only greatly reduces the boundary distortion area, improves the precision of reconstructed DEM data near the boundary, but also decreases the number of zeros adding on the boundary for wavelet transform, and boosts the compression ratio. On the basis of analyzing the distribution characteristics of coefficients in low and high frequency bands, a mixed entropy coding plan is applied, and a high efficient quantizator called"self-adaptive hard threshold"is established, which is helpful for improving the precision of the reconstructed DEM data and for enhancing compression ratio.

为了减小小波变换山区格网DEM数据压缩中边界失真区域，将山区格网DEM高程值视为广义坐标下的离散随机序列，把二维离散小波变换中的边界问题转换为一维离散小波变换中的边界问题，不仅大大减少了小波变换边界失真区域，提高了重构DEM数据边界点的精度，而且减少了边界补零个数，提高了压缩比；通过对山区格网DEM数据小波变换低频区和高频区变换系数分布特点的分析，采取了霍夫曼—游程混合熵编码方案，设计了高效、低失真的"自适应硬阈值"量化器，即对低频区变换系数不进行量化，直接进行霍夫曼编码；对高频区变换系数则先用"自适应硬阈值"方法量化处理，再进行游程编码。

In net of public security bureau alarm substation director Qiao Zhi expresses: Economic progress needs social stability, the ability of economic environment society that has had develops, electronic business affairs also is same, need has a favorable social order, the be in charge on next our can active exploration nets is led, go the cost of the spot greatly reduce come down, this kind of be in charge on the net is led, it is to pass IP to be grasper, drive the administrative pattern of minute of district, the netizen this locality netizen and other place is apart, greatly reduced each alarm the thing should go the cost that the other place investigates.

在大会上杭州市公安局网警分局局长乔智表示：经济发展需要社会稳定，有好的经济环境社会才能发展，电子商务也是一样，需要有一个良好的社会秩序，下一步我们会积极的探索网上的管事率，把去现场的成本大大的降低下来，网上的这种管事率，一是通过IP为抓手，推动分地域的管理模式，将本地网民与外地的网民分开，大大的降低了每一个警事都要去外地调查的成本。

2The speed of creating random series used irrational fraction arithmetic was faster than that of multiplicative congruence arithmetic. The correlative value of random series almost was zero.(3) Regarding not harm the images quality as the premise, the speed of FM screening was heightened.

主要结论：利用所建立的条件半色调函数进行图像加网，操作简单、控制精确，使发生阶调不连续处的密度差平均减少到0.01275，明显改善了调幅加网印品的质量；(2)无理数取尾法产生随机数的速度快，数列间几乎没有相关性；(3)在不损失图像质量的前提下，提高了调频加网的输出速度。

In this paper, the reasons leading to poor development effects of Chaoyanggou low-permeability oilfield are analyzed, the relational expressions between recovery efficiency and well spacing density, considering the start-up pressure, are given. In the paper, the water flooding control degree, lower limit of reservoir permeability, effectively driving factor, and other parameters are studied, and their influence on the well spacing density is presented.

中文摘要：摘要：本文分析了大庆朝阳沟低渗透油田开发效果差的主要原因，给出了考虑启动压力条件下，采收率与井网密度的关系式；研究了水驱控制程度、油藏渗透率下限、有效驱动系数等参数对井网密度的影响；确定了朝阳沟油田合理井网密度界限。

Peaceful photography reports Huang Xin of Tian Enxiang of reporter of report from our correspondent, trainee: Want you to have only enough " cash ", can buy next good friends to regard as " pet ", have a pet name, do sth over and over again, pacify a little while, this was recently net of within the country (the net inside Www.hainei.com), school (a game of special fire on the website such as Www.hainei.com) and happy net: Good friend buying and selling.

本报讯 记者田恩祥、实习生黄欣宁摄影报道：只要你有足够的"现金"，就可以买下好友当作"宠物"，起个小名，折腾一下，安抚一会，这就是近日国内网(www.hainei.com)、校内网(www.hainei.com)和开心网等网站上非凡火的一款游戏：好友买卖。

Under the fixed and clamped boundary conditions, a nonlinear differential oscillation equation with quadric and cubic items was presented by the Galerkin method, and a nonlinear free oscillation equation of the shallow reticulated shells with damage was solved.

基于Lematire等效应变损伤原理，计及扁球面网壳各个杆件的损伤影响，根据薄壳非线性动力学理论推导出含有损伤扁球面网壳非线性动力学方程和协调方程，在固定夹紧边界条件下，用Galerkin方法得到一个含二次和三次非线性振动微分方程，并对具有损伤扁球面网壳的非线性自由振动方程求解。

Above all the understanding that I think to say I am loved to the net, common saying says, the job should develop, understanding comes up first, make clear first only what is a net love, the job is begun rise ability will be purposeful, have way, the view that presses us should let Niu Gengtian namely, have to teach it first, speak of this ox plough back, my home has head flood bull, interest is large, those who eat is much also, 2 boy should cut my home everyday the several careless gift that choose are enough it eats, that 2 boy, sneaking also, read do not get a book, one day knows swarm issues a river only, fight strike gong... oh, do not be opposite, pull far, what is this net is loved?

首先我想说说我对网恋的认识，俗话说，工作要发展，认识先上来，只有先弄清什么是网恋，工作开展起来才会有目的，有方向，按我们的说法就是要让牛耕田，就得先教它，说起这个牛犁田，我家有头大水牯，劲大，吃的也多，我家二小子每天都要割好几挑的草才够它吃，那个二小子呢，也不争气，读不得书，一天只晓得爬树下河，打架敲锣……哦，对不住，扯远了，这个网恋是什么呢？

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。