L-型模糊格蕴涵代数

This paper introduced the concept of L-fuzzy sub lattice implication algebra and discussed its properties. Proved that the intersection set of a family of L-fuzzy sub lattice implication algebras is a L-fuzzy sub lattice implication algebra, that a L-fuzzy sub set of a lattice implication algebra is a L-fuzzy sub lattice implication algebra if and only if its every cut set is a sub lattice implication algebra, and that the image and original image of a L-fuzzy sub lattice implication algebra under a lattice implication homomorphism are both L-fuzzy sub lattice implication algebras.     

人原始生殖细胞的分离和体外培养

从4～10周龄药物流产胚胎的生殖嵴和肠系膜组织中分离原始生殖细胞(primordial germ cells,PGCs),培养在添加人重组白血病抑制因子(rh LIF)、人重组碱性成纤维细胞生长因子(rh bFGF)和Forskolin的小鼠饲养层细胞上.经过4～7 d培养,PGCs形成典型的鸟巢状集落.集落在传代过程中保持碱性磷酸酶活性,且胚胎阶段性特异抗原1(SSEA-1)、胚胎阶段性特异抗原3(SSEA-3)免疫荧光染色呈阳性.具有分化潜能的PGCs能在体外连续传代培养12代.结果表明从药物流产胚胎中分离的人类PGCs可以在体外培养成为具有分化潜能的多能性干细胞.     

谈“原始问题”与能力培养

把物理问题划分为“抽象问题”和“原始问题”两类，探讨如何求解“原始问题”，以提高解决实际问题的能力。     

四川东材企业集团有限公司

四川东材企业集团有限公司是目前中国最大的综合性电工绝缘材料制造商，公司现有员工1600余人，其中各类专业技术人员400余人，博士后、博士、教授级高工等高级技术职称50多人。     

Double-image sharing encryption based on associated fractional Fourier transform and gyrator transform

<正>We present a novel method for realizing double-image encryption algorithm by combining the images in different transform domains.Two original images are encrypted into two interim images by fractional Fourier transform and gyrator transform,respectively.The two encrypted images can be obtained by means of the addition and subtraction of the two interim images.This is defined as a double-image sharing scheme,in which the original images are encrypted into two parts.The original images cannot be recovered only with any one of the two interim images.Numerical simulation experiments demonstrate the validity of the algorithm.     

日观测到快速成长的巨大星体

 据《中国科学报》报道 日本国立天文台和东京大学的一个研究小组最近首次观测到一个正在快速成长的巨大原始星体.     

人类早期文明与科学起源——科学发展的人文历程漫话之一

描述了宇宙演化中的人类早期文明,原始人类的思维特点、原始人类的观念、活动("万物有灵"、巫术及神话)及科学在充斥神秘、荒诞的气氛中的起源.     

求解非线性规划的原始对偶内点法(英文)

In this paper, we propose a primal-dual interior point method for solving general constrained nonlinear programming problems. To avoid the situation that the algorithm we use may converge to a saddle point or a local maximum, we utilize a merit function to guide the iterates toward a local minimum. Especially, we add the parameter ε to the Newton system when calculating the decrease directions. The global convergence is achieved by the decrease of a merit function. Furthermore, the numerical results confirm that the algorithm can solve this kind of problems in an efficient way.     

中国声学学会设置“杰出声学论文奖与杰出声学技术奖”

中国声学学会决定设置“杰出声学论文奖与杰出声学技术奖”。奖的内容及评审办法如下: 1.中国声学学会为促进我国声学学科的研究水平及技术水平,表彰我国声学工作者在提高我国声学学科水平中作出的杰出贡献,特设置杰出声学论文奖及杰出声学技术奖,每一至二年颁发一次。每次各一名,宁缺毋滥。 推荐及评审办法 本奖采用提名、推荐办法,由一到二名高级职称的专家向分科学会提出推荐书,推荐书内容包括: