扩散硅压力传感器双桥补偿法

本文提出关于扩散硅压力传感器误差补偿的一种新方法，重点介绍该方法对零点温度漂移、灵敏度温度漂移以及非线性的补偿。     

Structural and electrical properties of γ-alumina - lithium sulphate films

Li₂SO₄ as a model ionic conductor has received very much attention over several decades. Especially, in recent years Li₂SO₄ and Li₂SO₄-Al₂O₃ have been mentioned as promising proton conducting electrolytes for applications such as intermediate temperature fuel cells and novel cogeneration systems regarding H₂S handling devices. This has encouraged us to strive towards further improvement of the properties of the materials to meet the demands of the applications. In order to improve the properties of this system, a new process, a suspension technique, has been recently developed to prepare nanostructured powder and thin film Li₂SO₄-Al₂O₃ membranes. The powders and thin films have a well crystallised structure composed of two phases, Li₂SO₄ and γ-Al₂O₃, and excellent mechanical strength. The thin film thickness is in the scale of a few to several mm with a smooth and shining surface and a homogeneous macroscopic structure. It is a very interesting phenomenon that all samples show no significant conductivity increase at the temperature of the phase transition (∼ 577 °C) from β to α phase of pure Li₂SO₄. This transition has important significance for applications. The conductivity of the two-phase film materials has been greatly enhanced, where the xLi₂SO₄-(1-x)Al₂O₃ (x=58) sample shows the highest conductivity, about 1 S/cm at 600 °C; the activation energy decreases with increasing Li₂SO₄ content. These results agree with the so called composite effect for the conductivity enhancement observed earlier for two-phase bulk materials. Based on the four-step proton conducting mechanism in sulphate-based materials, this work may propose a new mechanism. The protons might jump in a water network associated with the water molecular re-orientation, which is accompanied with the single proton jump of the four-step transportation among SO ₄ ²⁻ groups from one Li₂SO₄ molecule to another. The former mechanism occur in the interfacial region between the Li₂SO₄ and the Al₂O₃ grains, while the latter occur in the bulk of the Li₂SO₄ grains. These thin film materials are intended for use as proton conducting ceramic membranes in applications such as desulphurisation and fuel cell co-generation plants. Paper presented at the 5th Euroconference on Solid State Ionics, Benalmádena, Spain, Sept. 13–20, 1998.     

MAPCATI改性环氧丙烯酸双酯的合成及其紫外光固化涂料

采用自制个甲基丙烯酰氧β－丙氧甲酰氨基甲苯２－异氰酸酯（简称ＭＡＰＣＡＴＩ）中的异氰酸基与自制环氧丙烯酸双酯中羟基上的氢反应，制得了改性树脂；并以此为基料配成紫外光固化涂料。所得涂层性能优良，有应用前景。     

对高聚物薄膜栅控电晕注极的研究

本文以Teflon-FEP薄膜在常温下的空气中,加控制栅极前后进行电晕注极为例,研究了样品膜的注极效果。栅极的引入,不但能控制样品的表面电位值,而且使得样品的表面电荷分布更加均匀. 注极参数的变化将影响注极结果.实验表明:针极电压,注极时间,栅极电压,栅网孔径,针-栅间距和栅-膜间距各注极参数直接影响薄膜的表面电位值和表面电荷的分布.最后导出对Teflon-FEP薄膜的最佳注极参数,这些参数在同样条件下对其它聚合物也是适用的.     

葡萄糖酸锌辅助治疗中心视网膜病变的临床观察

中心视网膜病变２１例，对照组１０例，治疗组在对照基础上加服葡萄糖酸锌片，对中心视网膜病变的总有效率治疗组达８５％，对照组为６０％，有显著差异。     

On the analytic model of a class of hyponormal operators

A theory of analytic model of a class of simple hyponormal operators is given by means of a pair of mutually reciprocal analytic and hermitian kernels on the spectrum or its complementary domain. The functional calculus and the trace formula of the analytic model are established.     

On the semi-hyponormal n-tuple of operators

The theory of singular integral model and trace formula is extended to the context of hyponormal or semi-hyponormal n-tuple of operators. The spectrum of noncommutative n-tuple of operators is examined.     

K-rich lamellar exsolution in clinopyroxene： Constraint on the depth of peridotite source at Zhimafang

The oriented lamellar K-rich exsolutions within clinopyroxene host were recognized in garnet peridotite massif at Zhimafang in the Sulu ultrahigh pressure metamorphic terrane, eastern China. EMP and TEM analyses revealed that the composition and the index of electron diffraction for this exsolution are corresponding with phlogopite, and the shape is the lamellae with 1 μm in width and 5 to 30 μm in length. Moreover, the topotaxy is that the (001) of K-rich exsolution parallels to (I00) of the clinopyroxene host. The electron diffraction analyzing shows the exsolution is of a 1M polymorphism. The high-resolution lattice fringe image displays the stack features along [001], which only a layer mineral shows. We conclude that the clinopyroxene with IM and K-rich exsolution was probably derived from mantle depths over 240 km, thus resulting from decompressional exsolution in the initial stage of slab exhumation.     

Fingerprint representation methods based on B-Spline functions

The global characteristics of a fingerprint image such as the ridge shape and ridge topology are often ignored in most automatic fingerprint verification system.In this paper,a new representative method based on B-Spline curve is proposed to address this problem.The resultant B-Spline curves can represent the global characteristics completely and the curves are analyzable and precise.An algorithm is also proposed to extract the curves from the fingerprint image.In addition to preserve the most information of the fingerprint image,the knot-points number of the B-Spline curve is reduced to minimum in this algorithm. At the same time,the influence of the fingerprint image noise is discussed.In the end,an example is given to demonstrate the effectiveness of the representation method.     

Stability analysis of the rotor of ultrasonic motor driving fluid directly

The stability of the rotor of ultrasonic motor driving fluid directly is a key to its applications and control. This paper introduced the acoustic streaming and acoustic viscous stress near the boundary layer. Following this, the effect of acoustic viscous force on the stability of the rotor of ultrasonic motor driving fluid directly was presented in detail. The result showed that this system can be equivalent to a mass-spring and the spring constant can be used to weigh the stability of the rotor. By this model and relevant experiments, factors that affect the stability of the rotor such as the driving frequency, the rotor's weight and radius, the saturated acoustic streaming velocity, the mode number of stator vibration, the fluid's height and type are investigated and useful guidelines for design and application are obtained.