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.     

MRS study on lentiform nucleus in idiopathic Parkinson‘s disease with unilateral symptoms

OBJECTIVE: To investigate changes in magnetic resonance spectroscopy (MRS) of lentiform nucleus during the early stage of Parkinson's disease. METHODS: Twenty-five patients with idiopathic Parkinson disease with unilateral symptoms (IPDUS) and 25 healthy volunteers were enrolled in this study. MRS of the lentiform nucleus in each patient was taken and then concentrations of N-acetylaspartate (NAA), Creatine (Cr) and Choline (Cho) were calculated. RESULTS: Compared to that in the control, NAA/ (Cho+Cr) was significantly lower in the lentiform nucleus contralateral to symptoms and even that in the ipsilateral side in IPDUS patients (all P<0.05); while there was no difference between the two sides in the healthy volunteer (P>0.05). The ratio of NAA/(Cho+Cr) ipsilateral to the sympatomatic side of the patient was also lower than that of the control (P<0.05). CONCLUSIONS: There might be some changes with MRS on the lentiform nucleus during the early stage of idiopathic Parkinson's disease with unilateral symptom. MRS may be one of the reliable methods for early or even sub-clinical diagnosis.     

Formation of ζ phase in Cu-Ge peritectic alloys

Rapid growth behavior of ζ phase has been investigated in the undercooling experiments of Cu-14%Ge, Cu-15%Ge, Cu-18.5%Ge and Cu-22%Ge alloys. Alloys of the four compositions obtain the maximum undercoolings of 202 K（0.17TL）, 245 K（0.20TL）, 223 K（0.20TL） and 176 K（0.17TL）, respectively. As the content of Ge increases, the microstructural transition of ＂a（Cu） dendrite ＋ ζ＂ peritectic phase → ζ＂ peritectic phase →, ζ dendrite ＋ （ε＋ζ） eutectic＂ takes place in the alloy at small undercooling, while the microstructural transition of ＂fragmented α （Cu）dendrite ＋ ζ peritectic phase →, ζ peritectic phase →ζ dendrite ＋ ε phase＂ happens in the alloy at large undercooling. EDS analysis of the Ge content in peritectic phase indicates that undercooling enlarges the solid solubility of ζ rdendrite, which leads to a decrease in the Ge content in ζ phase as undercooling increases. In the Cu-18.5%Ge alloy composed of ζ peritectic phase, the Ge content in ζ phase increases when undercooling increases, which is due to the restraint of the Ge enrichment on the grain boundaries by high undercooling effect.     

Research on Key Techniques of Collaborative Design System

The development of product is a complex process. Collaboration is necessary to this process to support multi-function teams' participation in this process at the same time. Effective task decomposition is the prerequisite of collaborative design and constraint network was used to express the relationship among design participants. In order to make the coupling collaborative design go smoothly, a constraint satisfaction model based on dynamic constraint is put forward. An integrated-based conflict resolution model is advanced to resolve the complex conflict during the process of collaborative design.     

缩合多环芳烃树脂固化机理

以萘为原料，在酸性催化剂作用下合成出缩合多环芳烃树脂，对其结构进行了表征，采用ＤＳＣ和ＴＧ研究了其固化机理及固化产物的热稳定性。     

强化企务公开促进企业和谐——试论企务公开在构筑和谐劳动关系中的作用

企务公开是我国法律法规明文规定的保障职工权益的企业义务之一,它在构筑和谐劳动关系中的作用不容忽视.本文对此浅谈几点个人看法.     

荔枝保鲜研究1：——低温储存下抑制失水与防霉

本文研究荔枝保鲜过程中抑制荔枝失水和防霉问题。用含５％的瑞毒雷猛锌的保鲜液浸渍处理荔枝约５ｍｉｎ后，取出凉干。密封于装有吸潮－保温－乙烯吸收保鲜剂容器中，５℃￣８℃下储存。储存５０天后，好果率约８６％，货贺期约３０小时。     

平衡式复合齿轮泵(马达)的变量原理

介绍了平衡式复合齿轮泵（马达）的工作原理，分析了复合齿轮泵流量特性，在此基础上设计出差动轮系式复合齿轮泵变量系统，并进行了分析。     

加强内部财务管理,促进《县级公安机关公用经费保障标准》的落实

经费是一个组织正常工作的基础,《县级公安机关公用经费保障标准》颁布以来,县级公安机关的公用经费有了一定的提高,但是离标准还有相当的距离。为使公安机关能做好各方面工作,高效办公、高效办案,机关负责人应该尽量争取落实经费。在实际工作中,争取经费到位是每一个职工都关注的问题。如何落实经费保障标准,本文主要从加强内部财务管理来论述。     

金膜电极计时电位溶出分析法的理论及实验验证

本文导出了金膜电极上计时电位溶出分析法的理论公式,讨论了简化公式的应用条件。当τ/l~2≥3.0×10~(11)S·cm_(-2)时,可以使用简化的过渡时间方程式:(?)若取t≥2s,τ≥20s,则当l≤5.0×10~(-6) cm时,可以使用简化的电位-时间方程式:(?)经过验证,实验结果与理论相符。