拟合曲线

Given a planar point set,the moving least squaremethod is adopted to denoise and resample it so that the resulting point set is with low noise and uniform sampling density.Then the reliable signed distance field of the preprocessed point set is constructed by using the Level Set method.Finally,an algebraic B-spline function is adopted to fit the signed distance field by solving a linear equation system.

首先给定一个表示封闭曲线、可能带有噪音且分布不均匀的平面点云，采用移动最小平方(moving least square，简称MLS)方法对点云去噪、重采样，得到一个低噪音、分布均匀的"线状"点云，再通过Level Set方法建立该"线状"点云的离散几何距离场，最后用一个代数B-样条函数光顺拟合该离散距离场，代数函数的零点集即为重建曲线。

When surface alpha ray flux of granite are higher than 0.0052Bqcm〓, radionuclides gamma ray analyses must be done to determine if their internal and external indexes are in the range of'A'limits of national criteria of China.

3.1 花岗石的表面α筛选值本论文得到的花岗石的表面α水平与外照射指数的拟合关系为： I〓=0.2802+181.3α-1614α〓从拟和曲线可得：当花岗石的表面α水平低于0.0052 Bqcm〓时，内外照因子都在国家标准GB 6566-2001对A类饰材的的限制以内。

Some small sam-ple and large sample superiority of this estimate such as the unbiasedness,convergence,asymptotic normality and the property of simulation,are obtained.

我们得到分块拟回归的小样本和大样本性质，如无偏性、均方收敛性、强收敛性和渐近正态性，并讨论了曲线拟合的性质。

The reflectivity of the multilayer is measured at Bessy Ⅱ synchrotron radiation, and the peak reflectivity is measured to be 7.5%.

对衍射仪测量的掠入射反射曲线和同步辐射测量的反射率曲线分别进行拟合，得到的粗糙度和厚度比的结果相近。

Due to forward-bias-induced annealing effects,the laser diode biased during irradiation is less degraded than that short-circuited,and annealing curves can be fitted sectionally with different annealing rates.

激光二极管辐射损伤存在着正向偏置退火效应，FP和DFB结构的二极管具有相似的加电退火规律，均可拟合成指数衰减形式，退火曲线可以分成退火常数不同的几段进行拟合。

Part two : Analyzed the program of dynamic signal matching, expounded the pile wave analysis program by the method of characteristics, characteristic connection detruding, the problem of initial value or edge value, piles calculating model and pile-soil system, indicated the lack of the traditional high strain dynamic signal matching program.

第二部分：对实测曲线拟合法进行分析，阐述了弹性体细长杆中纵波传播的特征线解，特征关系的推导，初值与边值问题，桩的计算模型，桩侧土模型，桩尖土模型，指出传统拟合分析程序的参数不够全面的缺点。

It is demonstrated that the air temperature, ground temperature and their annual ranges in the Tibetan Plateau are highly correlated with corresponding latitude, longitude and elevation.

应用曲线拟合方法将所得统计分析系数拟合成时间函数，就可将高原地区的气温和地面温度表示成统一的空间坐标和时间的函数。

A, b, and c are curve-fitting constants in the curve equation y="1"–a×(1–x)c and the complementary-curve equation y="a"×(1–x)c, where a is a coefficient, b is the lower limit for x and is less than one, and c is a power constant.

对绘曲线装置，y为规一化输出位变量，x为非零平均值（小于1）到1的规一化输入模拟电压。a、b和c为用曲线方程y=1–a×(1–x)c拟合的常数，补充曲线方程y=a×(1–x)c，在此，a为系数，b为x的较低限制，且小于1，c为功率常数。

These means have following defects: I. parameter controls is too simple that will Fit the curve too roughly and can't give the configuration and characteristic of surge curve very good;II. The performance curve will change a lot when working condition changes,especially when woring temperature changes;III. Choking area will bring huge waste and is an area that the system oughts to avoid,but we haven't corresponding methods to watch and control it in the domestic till now.

这些措施具有以下缺点：1、控制参数过于简单，对曲线的拟合过于粗糙，不能很好的反映喘振曲线的形态和特点；2、当工作条件变化时，特别是工作温度有所变化时，性能曲线会发生很大变化；3、阻塞区会造成巨大的浪费，也是系统该避免的区域，可是目前国内还没有相应措施来监控它。

RCBV values calculated using cSVD and oSVD were identical. Both values were equal to the whole areas under the concentration-time curve were divided by the arterial input function areas. Moreover, these rCBV approximated to the rCBV calculated by signal-time curve fitting. rCBF with cSVD and oSVD wouldn't be underestimated by delay effect and were good for relative quantity. The scatter plots of rMTT and Td were useful in stroke staging.

cSVD和oSVD所得组织脉冲反应曲线的面积相等，均等於完整的浓度时间曲线下面积除以动脉输入函数下全部面积；而且，此结果和讯号时间曲线拟合很接近。cSVD和oSVD不会因延迟效应低估rCBF，可以良好反应不同组织的血流量相对值。rMTT和Td散布图在不同疾病种类或处於不同疾病分期，显示不一样的分布。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。