基于浏览器方式的考试系统的实现

计算机文化基础考试系统是一种基于网络Ｂｒｏｗｓｅｒ／Ｓｅｒｖｅｒ方式可在Ｉｎｔｒａｎｅｔ／Ｉｎｒａｎｅｔ网络环境下运行的应用软件。它以计算机理论考试试题库为基础,能够实现自动生成考试试卷,自动评分等功能,并允许考生在本地或远程通过浏览器阅答试卷,实现无纸化考试。     

Thermochemical Water Splitting for Hydrogen Production Utilizing Nuclear Heat from an HTGR

A very promising technology to achieve a carbon free energy system is to produce hydrogen from water, rather than from fossil fuels. Iodine-sulfur (IS) thermochemical water decomposition is one promising process. The IS process can be used to efficiently produce hydrogen using the high temperature gas-cooled reactor (HTGR) as the energy source supplying gas at 1000℃. This paper describes that demonstration experiment for hydrogen production was carried out by an IS process at a laboratory scale. The results confirmed the feasibility of the closed-loop operation for recycling all the reactants besides the water,H2, and O2. Then the membrane technology was developed to enhance the decomposition efficiency. The maximum attainable one-pass conversion rate of HI exceeds 90% by membrane technology, whereas theequilibrium rate is about 20%.     

COMPARING THE INDEPENDENCE OF DIFFERENT RANDOM NUMBER GENERATORS

Pseudo-random number generators have always been important in experimental design, computer simulation, cryptography and statistical analysis. This paper presents a method of comparing the degree of independence exhibited by various random number generators, a procedure, based on consideration of the largest (in modulus) non-unit eigenvalue of the observed Markov transition matrix, is used to assess the ‘randomness‘ of a random number generator.     

城市地下空间工程新专业的设置与建设

论述了高等学校设置城市地下空间工程专业的必要性,指出在高等学校设置城市地下空间工程专业符合我国城市现代化建设的需要,具有现实的和潜在的市场需求.介绍了我国首次设置城市地下空间工程专业的过程和专业建设中在教学大纲、课程设置、教材建设、教学环节和专业宣传和就业指导等方面所做的探索.     

Extraction of affine invariant features for shape recognition based on ant colony optimization

A new approach to extraction of affine invariant features of contour image and matching strategy is proposed for shape recognition.Firstly,the centroid distance and azimuth angle of each boundary point are computed.Then,with a prior-defined angle interval,all the points in the neighbor region of the sample point are considered to calculate the average distance for eliminating noise.After that,the centroid distance ratios(CDRs) of any two opposite contour points to the barycenter are achieved as the representation of the shape,which will be invariant to affine transformation.Since the angles of contour points will change non-linearly among affine related images,the CDRs should be resampled and combined sequentially to build one-by-one matching pairs of the corresponding points.The core issue is how to determine the angle positions for sampling,which can be regarded as an optimization problem of path planning.An ant colony optimization(ACO)-based path planning model with some constraints is presented to address this problem.Finally,the Euclidean distance is adopted to evaluate the similarity of shape features in different images.The experimental results demonstrate the efficiency of the proposed method in shape recognition with translation,scaling,rotation and distortion.     

高速逆流色谱分离苦参中的总生物碱

以氯仿：甲醇：ＮａＨ２ＰＯ４缓冲液（ＰＨ５．４）＝２７：２０：１３为溶剂系统，上相为固定相，下相为流动相，从中药苦参的部属 共分得１０个成份，其中９个与碘化铋钾试剂反应生成桔红色的化合物，还用高效硅胶薄层板验证了分离效果，并用ＭＳ证实了其中的苦参碱成份。     

试论高校学风建设

加强高校的学风建设是高校自身发展过程中的一项内在的客观要求,是高等教育改革和发展的一个永恒主题.良好学风的养成不能靠顺其自然,需要外力加以引导和推动.形成优良学风需要学校领导、教师和学生长期的努力,需要在校内倡导一个学风养成的良好环境,也需要有利于学风建设的社会大环境.     

Superconducting Properties and Microstructure in MgB2 Bulks, Wires and Tapes

We prepared a series of MgB2 bulk samples under different temperatures, holding time and increasing rates in temperature by the solid state reaction. The thermodynamic behavior and phase formation in the Mg-B system were studied by using DTA, XRD and SEM. The results indicate that the formation of the MgB2 phase is very fast and the high increasing rate in temperature is necessary to obtain high quality MgB2. In addition, the effects of the Zr-doping in Mg1-xZrxB2 bulk samples fabricated by the solid state reaction at ambient pressure on phase compositions, microstructure and flux pinning behavior were investigated by using XRD, SQUID magnetometer, SEM and TEM. Critical current density Jc can be significantly enhanced by the Zr-doping and the best data are achieved in Mg0.9Zr0.1B2. For this sample, Jc values are remarkably improved to 1. 83 × 106 A/cm2 in self-field and 5. 51 × 105 A/cm2in 1T at 20K. Also, high quality MgB2/Ta/Cu wires and tapes with and without Ti-doping, MgB2/Fe wires and 18 filamen     

Diagnosis of Vocal Cord Paralysis in Anaesthesia

Vocal cord paralysis can occur as a complication o surgery or anaesthesia,if permanent is a significant clinica problem.Early detection is important to optimize the chance o repair,and avoid complications associated with an impaired swallow.An algorithm to detect altered vocal cord function was presented based on wavelet packet analysis(WPA) and suppor vector machines(SVM),and compared with the Hoarseness Diagram method(HDm),which was reported as an objective voice quality evaluation approach and could be u...