差

In the case of 〓unknown,this dissertation derived the exact distribution of related statistics,and thenproposed the multivariate covariance control charts:the A chart and the 〓 chart based onthe sample generalized variance and the maximum and the minimum eigenvalues.

当分布参数〓未知时，本文通过推导有关统计量的精确分布，建立了基于样本广义方差和最大、最小特征根的多元协方差控制图—A图和〓图，为实际应用奠定了基础。

Effects of dry temperature and dry time on properties of heat cured sand and the relationship with binder composition are as follows:sands bonded by binders that are not modified have high strength when dry temperature is high and dry time is long,but their anti-wettability power is poor . Sands bonded by binders that are modified by B but not modified by M can be dried quickly and sand strength is high but anti-wettability power is also poor. Sands bonded by binders that are modified by M but not modified by B can also be dried quickly to obtain maximum strength,then the strength becomes lower when they are dried continually for more time. and sand strength is high but anti-wettability power is also poor. Sands bonded by binders that are modified by M as well as by B at the same time can be dried quickly to obtain maximum strength at low temperature and short time. But the anti-wettability of sand mold is best when they are dried at high temperature and long time.

烘干温度和烘干时间对热硬砂性能的影响及其与粘结剂改性的关系是：未经改性剂B和改性剂M改性的粘结剂砂，脱水速度较慢，烘干温度越高，时间越长，则硬化强度也越高，但未经改性的粘结剂热硬砂的抗吸湿性较差；经改性剂B而不经改性剂M改性的粘结剂热硬砂，烘干硬化速度较快，强度也高，但在高湿度下的抗吸湿性不好；经改性剂M改性而不经改性剂B改性的粘结剂热硬砂，烘干时强度先随烘干时间升高至最大值后，继续烘干时强度又出现下降；经改性剂B和经改性剂M共同改性的粘结剂热硬砂能在短时间和较低的烘干温度下就可烘干到最高强度，即烘干脱水的速度较快，但试样的抗吸湿性差，若在更高温度和更长时间下烘干，试样的抗吸湿性得到改善，综合考虑烘干强度和抗吸湿性要求，对于φ30×30mm试样，理想的烘干温度是200℃，烘干时间20分钟。

We assess the anatomical result of distal radius after clinical union of fracture according to the scoring system based on the modification by Sarmiento et al(1980), and function scores of affected wrist at pretherapy 、2nd week 、4th week 、8th week according to the points system of Gartland and Werley modified by Sarmiento(1975). The anatomical result was divided into 4 group : excellence, good , fair, poor.

在课题研究过程中，根据Sarmiento影像学评分标准和Sarmiento改良的Gartland and Werley腕关节功能评分标准，测量Colles关节内骨折临床愈合后的影像学评分和治疗前、第2周、第4周、第8周的功能评分，其中影像学评分按分数高低分为优、良、差、极差4个解剖等级。

In addition, making use of the complete calculation of internal faults, some merits, such as scientifically setting the new scalar product restraint differential protection, exactly selecting the type of current transformer for zero-sequence current transverse differential protection and accurately understanding the backup impedance protection, are acquired at the same time. And these achievements contribute to the realization of the above quantitative design.

另外，通过全面的内部故障仿真计算，实现了新型差动保护方案动作特性的科学整定、零序电流型横差保护用TA的准确选型以及对后备阻抗保护性能的正确认识等，而这些工作的完成又是定量化设计成果得以实现的有力保证。

The calibration method of CCD scale parameter is presented. Image difference method is the important base of visual detection, but the noise will affect the result very seriously.

差图象方法是视觉检测的重要基础，但由于噪声的干扰很大，容易造成判断的错误，因此差图象去噪方法是本文重点研究的问题。

The algorithms estimate the DOA of the broadband distributed source fron the secondary diagonal elements of the covariance matrices generated from every frequency domain of the received broadband signal s, thus avoiding unwrapping of phases.

该类算法首先将阵列接收的宽带信号变换到频率域，然后对于每个频率形成阵列接收信号协方差阵，最后由该协方差阵的次对角线元素估计宽带分布源的到达角，其主要特点是避免了相位展开。

A general study of the Seidel aberration properties of the flat slab lens systems made from left-handed materials was presented according to the primary aberration theory.

根据初级像差理论广泛研究了由左手性介质构造的平板透镜系统的赛德尔像差特性。

To form the theory and method of hybrid refractive-diffractive optical design that can join to the Chinese conventional optical design system, the primary aberration theory expressed by PWC about HRD systems has been investigated, and the function relation between Seidel sums and P, W, C, between ∞,∞,∞ and the diffractive lens structure have been established.

为了形成与中国传统光学设计体系相街接的折衍混合光学设计的理论和方法，研究了PWC表示的折衍混合薄透镜系统初级像差理论，建立了赛德尔像差和数与P、W、C的函数关系，以及∞、∞、∞与衍射透镜结构的函数关系。

Because the free form surface expressed by discret points has difficulties in aberration correction, manufacture and test, the Zernike polynomial was adopted to express the free form surface. The performance of this system was optimized on the basis of the relationship between Zernike polynomial and Seidel aberration.

由于离散点表述的自由曲面在像差校正、加工及检测等方面存在困难，提出了采用Zernike多项式表征自由曲面的面形，并利用Zernike多项式与Seidel像差之间的关系，优化自由曲面成像系统性能。

Probabilities of Specific Numbers Resulted from Sele calculation in The Book of Changes and Its Applications in Archaeology;2. So the upper bounds of maximum differential and linear characteristic probabilities for 4r-round ciph.

从而若设轮函数的最大差分和线性特征的概率分别为p和q，则4r(r≥2)轮广义Feistel密码的差分特征和线性特征的概率分别以p2r+1和q2r+1为其上界。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。