边界值

Total counts, diameter of sphere and imaging mode, offered no significant difference of the threshold value.

热区直径、总计数率及採集模式对靶区边界閾值的计算没有明显差异。

This method utilizes the distribution property of image intensity. Given the false alarm probability, the threshold for likelihood difference can be determined.

该方法利用SAR图像的强度分布特性，根据虚警率确定相邻区域之间存在边界的似然差函数的阈值。

This method utilizes the distribution property of image intensity. Given thefalse alarm probability, the threshold for likelihood difference can be determined.

该方法利用SAR图像的强度分布特性，根据虚警率确定相邻区域之间存在边界的似然差函数的阈值。

The primary function of reactor protection system is to protect the integrity of the three nuclear safety barriers, namely, fuel cladding, primary pressure boundary and containment. When the certain safety limits, determined by the accident studies, are exceeded, The reactor protection system will give the protection signals of reactor trip and/or safeguard actuations, and then the reactor trip system and/or the engineered safety features are actuated.

反应堆保护系统的功能主要是保护三道核安全屏障(燃料包壳、一回路压力边界和安全壳)的完整性，当运行参数达到危及三道屏障完整性的阈值时，保护系统动作触发反应堆紧急停堆和启动专设安全设施。

I contented myself with thesediscoveries for this time, and came back, musing with myself whatcourse I might take to know the virtue and goodness of any of thefruits or plants which I should discover, but could bring it to noconclusion; for, in short, I had made so little observation while Iwas in the Brazils, that I knew little of the plants in the field;at least, very little that might serve to any purpose now in mydistress.

后来，我急于想看看自己这个小小王国的边界，就决定绕岛航行一周。为此，我先往船上装粮食，装了两打大麦面包，又装了一满罐炒米，一小片甘蔗酒，半只山羊肉，还有一些火药和子弹，准备用来打山羊。另外，我还拿出了两件水手值夜穿的衣服，这我前面也提到过，是我在水手箱子中找到的。这两件衣服放到船上，一件可以用来作铺被，一件用来作盖被。

Combining the actual rockburst status after excavation, based on the previous research data in the earlier stage, the character of the tectonic stress in Cangling Tunnel is studied. Finite element method is adopted to simulate the site excavation steps. At the same time, the tectonic stress is changed on the boundary of the model to simulate the actual rockburst areas; and the most proximal area's value is adopted to decide the section tectonic stress. Then, other sections' values are revised.

从苍岭隧道的构造应力场特征入手，结合现场开挖后岩爆实际发生状况，在前期研究资料的基础上，利用有限元计算分析，模拟现场实际施工步骤的同时不断改变模型边界上的构造应力来拟合实际岩爆区，以最接近实际破坏范围的计算结果界定区段构造应力值，据此对隧道各区段的构造应力进行修正。

REE plays an important role in rec ognizing the boundaries of sequence and system tracts and reconstructing sedime nt lithofacies paleogeographic conditions, including ancient water depth,ancie nt salty, pH value and Eh value of water body,oxidation and reduction conditi on and eustacy of lake level.

稀土元素对识别层序、体系域边界及恢复层序框架内的沉积岩相古地理(古盐度、古水深、水体的pH及Eh值、氧化还原条件、湖平面升降变化)都具有重要意义。

The flow-field around a hemisphere and a flat-nosed cylinder in the shock tube is simulated numerically by using non-equilibrium Navier-Stokes equations with an air chemical model of 5 species 17 reactions, and the catalytic rate constant of surface materials such as Pt, SIC:, Ni and a flight vehicle materials is determined by using the heat transfer rate of testing in the shock tube and the distribution of heat transfer rate along with the catalytic rate constants.

用5组分17个化学反应Durm-Kang空气化学模型和轴对称热化学非平衡Navier-Stokes方程，对激波管中球头和平头圆柱模型绕流流场进行了数值模拟，给出了驻点热流随催化速率常数变化的分布，并根据激波管实验测量的热流值确定了表面材料Pt、SiO2、Ni和某种飞船材料的催化速率常数，建立了数值分析高焓流动边界层催化特性的软件。

First of all two-dimensional bar code of the positioning and segmentation algorithm using Hough Transform and Sobel edge detection of the bar code images collected from the original image to effectively separate and then analyzes the barcode image through the optical system of the noise model, put forward a Calculation of point spread function of standard deviation of the algorithm uses Flourier transform adaptively select the threshold to remove noise caused by invalid border, bar code and thus be the basic module.

首先探讨了二维条码的定位与分割算法，利用Hough变换与Sobel边缘检测把条码图像从原始采集的图像中有效地分割出来然后分析了条码图像经过光学系统的噪声模型，提出了一种计算点扩展函数标准方差的算法采用Flourier变换自适应地选取阈值去除噪声导致的无效边界，从而得到条码的基本模块。

The 3-D single phase simulation using CFX for the rod bundle channnel was going on by choosing the reasonable mathematical and physical models and boundary conditions. After a lot of numerical calculations, the sensitivity of gemotery was validated. The flow and heat transfer characteristics for several typical velocities were numerically analyzed and visually showed. The results show that the CFX simulation can be used for designing and optimizing fuel assembly in reactor engineering.

通过选定合理的数学、物理模型和边界条件，采用通用CFD程序ANSYS CFX 10.0对带有AGA-2G定位格架的5×5棒束通道流场进行了三维单相数值模拟，经过大量计算，验证了厚度、刚突等几何敏感性，得到了带定位格架棒束通道内的速度、压力和温度分布，分析了定位格架对流场、温度场的影响，直观地获得了搅混叶片的搅混效果，并将结果同实验值进行了初步比较。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。