对数

Aiming at automatic registration of multisensor images and multispectral images, we present an Fourier-based registration algorithm to estimate translations, rotations, and scalings in these images.

针对存在平移、旋转和尺度关系的多传感器、多谱段遥感图像配准问题，提出了一种基于边缘特征提取和伪对数极坐标傅里叶变换的频域配准技术。

The results showed that soil wind erosion was the near-surface wind-sand activity. The sediment particle saltates mainly in 7.5-43.5 cm. Wind sediment amount decreased along height, which correlate well with power function, exponent function and logarithm function. The sediment particle composition was influenced strongly by wind erosion intensity and topsoil characteristics. However, the regularity of sediment composition was distinct in a definite paticle size in different heights. Wind erosion amount increases with wind speed exponentially, which was influenced by times that the wind does.

结果表明：阴山北麓农牧交错带土壤风蚀是一种近地表的风沙运动，风蚀物跃移颗粒体主要集中在7.5～43.5 cm高度，风蚀物含量沿高度呈一递减函数，对幂函数、指数函数和对数函数均具有较好的相关性；风蚀物颗粒组成与风蚀强度和地表状况关系密切；风蚀物颗粒组成以某一粒径范围、某一高度为界随高度的变化而表现出明显的规律性；风蚀量沿高度的变化与风力作用时间有关，风蚀量随风速的增大呈指数增加。

The disc rete logarithm on elliptic curve is very difficult to be solved. So the both sid es can construct public-key croptosystem., but select the suited elliptic curve and make operation on it is very difficult.

而求此离散对数是非常困难的，由此双方可以构造公钥密码体制，但选择适合的曲线及在其上的计算又是复杂的。

On the assumption that investment funds follow lognormal distribution, the reinsurance pricing question affected by investment gains is discussed from the reinsurers' angle.

从再保险人的立场出发，在投资基金服从对数正态分布的假定下，讨论了在投资收益影响下的再保险保费定价问题。

The log10 of survivors from radiation is plotted against the radiation dosage, and the radiation D or D10, which is comparable with the thermal D value, is obtained. The D10 is defined as the amount of radiation in rads (ergs of energy per 100g of material) required reducing the microbial population by 1 log (90%).

若将照射中存活微生物数目的log10值对照射剂量进行标绘，则可求出辐照D值(即D10值)，此值与热力D值相当。D10值的意义是微生物总数减少一个对数周期(90％)所必需的照射拉德数(每100克物质得到的能量尔格数)。

The log10 of survivors from radiation is plotted against the radiationdosage, and the radiation D or D10, which is comparable with thethermal D value, is obtained. The D10 is defined as the amount ofradiation in rads (ergs of energy per 100g of material) requiredreducing the microbial population by 1 log (90%).

若将照射中存活微生物数目的log10值对照射剂量进行标绘，则可求出辐照D值(即D10值)，此值与热力D值相当。D10值的意义是微生物总数减少一个对数周期(90％)所必需的照射拉德数(每100克物质得到的能量尔格数)。

Optimized geometry of the roller raceways, rollers with logarithmic profile and an integrated optimized lubrication system are increasing the technical and economical value.

滚柱滚道的几何最优化，拥有对数的外形和整合优化的润滑系统提升了技术和经济效益。

Plotting Logarithm of quenching constant against Hammett constant of side-group X of quenchers, a straight line was obtained.

另外，还研究了一系列〓型猝灭剂对咔唑荧光的猝灭，发现猝灭常数的对数同侧基的Hammett常数成很好的线性关系。

More accurate crystallographic parameters and improved mathematical model were used in simulating the formations of 3D plate-shaped or 2D lenticular-shaped Ni4Ti3 variants.

与二维模型相比，本研究采用了准确的晶体学参数及改进的数学模型，获得了更为直观及合理的三维盘状变体及二维透镜状变体； Ni4Ti3沉淀相的长度、宽度和面积分数随时间的变化分别遵循指数、线性和对数关系；且其长度与宽度的比值并非恒定值，在生长初期该比值有较大的增速而随后逐渐减慢，能很好地解释沉淀相盘状及透镜状形貌特征形成的原因并与相关实验结果吻合。

Array privatization is one of the most effective loop transformations for the exploitation of parallelism. This transformation technique privatizes arrays according to the information of the data dependence analysis, which eliminates the memory-related dependences, i.e. anti and output dependences, to make the loop execute parallel.

数组私有化是开发并行性最有效的循环变换技术之一，它以数据依赖关系分析为依据对数组进行私有化，消除循环中的存储关联数据相关，即反相关和输出相关，使循环可以并行执行。

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。