Characterization of microbe cementitious materials

A new generation of cement, microbe cement, has been developed in response to the ever increasing awareness of environmental protection. Microbe cement is a new strengthening material based on microbiologically induced precipitation of calcium carbonate. This paper confirms the feasibility of binding loose sand particles using microbe cement and details the cementation mechanism of microbe cement. We have also prepared microbe cementitious materials (biosandstones). The compressive strength of the bio-sandstone, which depends on the content of calcium carbonate produced by microbially induced precipitation and the bio-mediated calcite crystal size, could be up to 12 MPa at an age of 20 days. By increasing the precipitated calcite content, the compressive strength and microstructure of bio-sandstone could be improved.     

Initializing K-means Batch Clustering: A Critical Evaluation of Several Techniques

K-means clustering is arguably the most popular technique for partitioning data. Unfortunately, K-means suffers from the well-known problem of locally optimal solutions. Furthermore, the final partition is dependent upon the initial configuration, making the choice of starting partitions all the more important. This paper evaluates 12 procedures proposed in the literature and provides recommendations for best practices.     

A fast pseudorandom number generator with BLAKE hash function

This paper presents a fast pseudorandom generation algorithm, which is based on the BLAKE hash function and can pass the random test of the NIST (National Institute of Standards and Technology) Statistical Test Suite. Through theoretical analysis and experimental imitation, our new algorithm is proven to be more secure and efficient than G-SHA1. Simultaneously, we introduce and discuss the BLAKE in detail. Its security shows that can be utilized to generate pseudorandom bit sequences, which the experimental results show the BLAKE hash function has excellent pseudorandomness. Therefore, we believe the BLAKE is one of the most potential candidate algorithms of SHA-3 program.     

NECESSARY AND SUFFICIENT CONDITION FOR GLOBAL CONTROLLABILITY OF A CLASS OF AFFINE NONLINEAR SYSTEMS

In this paper, we investigate the global controllability of a class of n-dimensional affine nonlinear systems with n- 1 controls and constant control matrix. A necessary and sufficient condition for its global controllability has been obtained by using the methods recently developed. Furthermore, we generalize the above result to a class of affine nonlinear systems with a block-triangular-like structure. Finally, we will give three examples to show the applications of our results.     

论信息资源与网络建设的契合

文章论述开发信息资源和网络建设对经济建设的巨大作用，提出了信息资源和网络建设的实现途径。     

SiO脉泽源在银河系中的分布和空间运动

通过对日本野边山射电天文台45m望远镜探测到的453颗SiO脉泽源的相关数据进行分析和处理，研究了SiO脉泽源在银河系中的分布和运动学特征。     

On functional decomposition of multivariate polynomials with differentiation and homogenization

This paper gives a theoretical analysis for the algorithms to compute functional decomposition for multivariate polynomials based on differentiation and homogenization which were proposed by Ye,Dai,and Lam(1999) and were developed by Faugere,Perret(2006,2008,2009).The authors show that a degree proper functional decomposition for a set of randomly decomposable quartic homogenous polynomials can be computed using the algorithm with high probability.This solves a conjecture proposed by Ye,Dai,and Lam(1999).The authors also propose a conjecture which asserts that the decomposition for a set of polynomials can be computed from that of its homogenization and show that the conjecture is valid with high probability for quartic polynomials.Finally,the authors prove that the right decomposition factors for a set of polynomials can be computed from its right decomposition factor space.     

不同融合条件及激活方法对体细胞克隆绵羊胚胎发育的影响

对成年绵羊耳部皮肤细胞进行培养传代，将培养出的成纤维细胞经血清饥饿法处理后，作为核供体移植到MII期去核卵母细胞中进行核移植胚胎的生产，用细胞驰素B法与离子霉素＋6－DMAP法对核移植胚胎（重构胚）在电融合后进行化学激活，然后在38.6度，5％CO2，最大相对湿度条件下，进行体外培养（IVC），重构胚卵裂率分别为37．8％与43．8％（51／135与81／185），囊／桑葚胚率分别为9．8％和12．3％（5／51和10／81），在融合电压1．5kV/cm，持续时间30us，脉冲次数为2次的条件下，孤雌激活胚胎的卵裂率和囊／桑葚胚率分别为81．0％和12．9％。     

用阳极溶出伏安法研究天然水中铅与有机物作用的特性

将内蒙古的呼伦湖，中国南海北部的所有水样通过０．４５μｍ过滤，用阳极溶出伏安法进行测定，在天然ｐＨ下，测定了铅的表观络合容量和条件稳定常数，呼伦湖的络合容量（Ｃ．Ｃ）比海水大，ｌｏｇＫ相近，海水的Ｃ．Ｃ极大值在表层，随深度增加而减小。     

新疆哈萨克大尾羊盲肠和结肠初袢综合肌电的活动规律

盲肠的电活动特征与结肠初袢的相同，均为以峰电活动为特征的电活动期与静息期交替出现的周期性电活动。盲肠、结肠初袢有长间隔（６３．２７±４．１３ｍｉｎ），短时程（５．１６±０．１３ｍｉｎ）的增强性峰电活动相，盲肠、结肠初袢的峰电具有移行性，常见的移行性峰电有５种类型，均与回肠无关系。