双变性的

In the ***, all types and fundamental principles of Radon transform are summarized systematacially. This *** starts from the general linear Radon transform, and then researches how to use the damped least square method to find the solution of the forward transform. However, the least squares smoothing effect will lead to a certain degree of trails in the data of Radon domain, which led to the application\'s limitations. After that the implementation in Radon domain and relative merits of linear Radon transform, parabolic Radon transform and polynomial Radon transform which have time invariance are introduced, the conjugate gradient method that can solve numerical solution is also given. And then the high resolution Randon transform is discussed, it introduces the regularization theory and Bayes principle into inversion, which successfully remove the negative affect caused by discrete Radon transform. Finally, we introduce the optimal weighting similar coefficient Radon transform, which adapt to the time variant quality of hyperbolic Radon transform.

本文系统总结了Radon变换的各种类型及其基本原理，从τ- p变换(即一般线性Radon变换)出发，研究利用阻尼最小二乘平方法求解其正变换，但是最小平方法的平滑作用会导致Radon域数据存在一定程度的拖尾效应，给这种方法的应用带来了很大的局限性；然后先容了具有时不变性的线性、抛物和多项式Radon变换在频率域的实现及其优缺点，给出了求解其数值解的共轭梯度算法；接着讨论了高分辨率Radon变换，它把正则化思想和贝叶斯原理引进到了反演中，很好的克服了离散Radon变换产生的截断效应对结果的不利影响；最后先容了适应双曲Radon变换时变性质的高分辨率最优相似系数加权Radon变换。

Bnormal MRI manifestations in all of the 20 cases with acquired hepatocerebral degeneration,in which T1WI demonstrated increased signal in hibateral lentiform nucleus (n=20),globus pallidus(n=17),surrounding mesencephalon red nucleus(n=15),and in anterior pituitary(n=4)While T2WI demonstrated no corresponding alteration in signal intensityConclusion Abnormal MR signal in the patients with acquired hepatocerebral degeneration has special features and MRI has right value for the diagnosis of this disease

全部病例均有完备的临床与MRI资料。结果：20例脑部均有阳性MRI表现，其中双侧、豆状核20例，苍白球17例，中脑红核周围15例，垂体前叶4例，表现为自旋回波序列T1WI为高信号，T2WI及FLAIR像无异常。结论：获得性肝性脑部变性的MRI征象具有特征性，MRI对该病的诊断有较高价值。

Under certain conditions,the explanation far the double sigmoidal curves of two-domain proteins is given.At the same time, some expectations for several different unfolding processes are made...

从构象渐变的观点，对双结构域蛋白质变性过程中出现双S形变性曲线的原因做出了解释，同时对变性过程中可能出现的一些情况进行了预测和分析。

The unfolding processes of the typical two-domain proteins are discussed in more details. Under certain conditions, the double sigmoidal curve of two-domain protein can be accounted for. At the same time, some expectations for several different unfolding processes are made.

在一定参数条件下，用上述理论模型解释了双结构域蛋白质变性过程中出现双S形变性曲线的原因，同时对变性过程中可能出现的一些情况进行了预测和分析。

In spherical polar coordinates, DRSC potential have supersymmetry and shape invariance for θ and r coordinates. By using the method of supersymmetry and shape invariance, exact bound state solutions of Schrodinger equation with double ring-shaped Coulomb potential are presented. The normalized angular wave function expressed in terms of Jacobi polynomials and the normalized radial wave function expressed in terms of the Laguerre polynomials are presented. Energy spectrum equations are obtained.

本文研究了双环形Coulomb势Schrdinger方程的束缚态精确解，所采用的方法是首先对双环形Coulomb势的Schrdinger方程在球坐标系中进行分离变量，得到相应的角向方程和径向方程；证明双环形Coulomb势在角向和径向具有超对称性和形不变性；根据超对称性和形不变性的性质，获得了角动量量子化条件和束缚态的能谱方程，并将归一化角向波函数用Jacobi多项式表示，将归一化径向波函数用Laguerre多项式函数表示。

Heteroduplex molecules have been made by mixing pJSA1175 and pJSAl175ADRV4, pJSA1175ADRV4 and pJSAl175RRV4 DNA molecules which have been linearized by Pst Ⅰ and Bgl Ⅱ respectively, denaturing them in alkaline or high temperature, allowing them to renature and then spreading in the presence of formamide.

以痘苗病毒表达载体pJSA1175及重组质粒pJSA1175ADRV4(含ADRV VP4基因)、pJSA1175RRV4(含猴轮状病毒VP4基因)为材料，用碱变性方法或热变性方法制备了载体质粒与重组质粒DNA之间的异源双链，电镜下成功观察到载体序列部分经变性、复性后配对呈双链状态，而外源基因区域突出呈单链环状结构，测量长度为2.3kb。

Blumenkranz MS, Bressler NM, Bressler SB, Donati G, Fish GE, Haynes LA, Lewis H, Miller JW, Mones JM, Potter MJ, Pournaras C, Reaves A, Rosenfeld PJ, Schachat AP, Schmidt-Erfurth U, Sickenburg M, Singerman LJ, Slakter JS, Strong A, Vannier S; Treatment of Age-Related Macular Degeneration with Photodynamic Therapy Study Group.

研究设计及安排：从2个多中心（22个北美和欧洲眼科诊所）、双盲、安慰剂对照的维速达尔光动力疗法治疗湿性年龄相关性黄斑变性的随机临床试验中选择患者进行后续延长的观察。对象：在TAP研究中随诊24个月，维速达尔治疗CNV可能减轻进一步视力丧失的危险的患者

Results: In the 13 cases, the CT diagnosis show that five cases of low-density lesions of Bilateral hepatolenticular, five cases of globus pallidus, one case of Bilateral hepatolenticular with corpus callosum, one cases of External capsule putamen, one case of Putamen with the caudate nucleus, three cases of low-density of Bilateral lobi frontalis and lobi parietalis, one case of unilateral putamen hemorrhage, three cases of cerebral atrophy.

目的 探讨双侧基底节区对称性低密度病变的CT诊断价值。方法回顾性分析肝豆状核变性5例、中毒性病变5例、Wernicke脑病2例、Huntington氏大舞蹈病1例的CT平扫表现及临床意义。结果 13例中，CT示双侧豆状核低密度5例、苍白球5例、双侧豆状核伴胼胝体1例、壳核伴外囊1例、壳核伴尾状核1例；双额顶叶低密度3例、单侧壳核出血1例、大脑萎缩3例。

The result showed that the compound modified maize starch had obvious applied purpose on inhibited, emulsification, resistant-gelgelatin, edible oil-saving, film strength.

结果表明，双变性玉米淀粉在抗老化、乳化、抗凝胶、节油、成膜方面具有明显的应用效果，从而为开发新的食品添加剂提供一些参考。

A new type of dimorphic denature starch cationic starch with lauril glucoside was synthesized by reaction of cationic starch with lauryl alcohol at the presence of emulsifier and catalyst.

在乳化剂和催化剂作用下，以阳离子淀粉和月桂醇为主要原料，合成了一种新型高取代度的双变性淀粉——阳离子淀粉月桂基糖苷。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐