高强耐蚀At—mg合金的研究现状

介绍了国内外高强、耐蚀Al-mg合金的发展现状。论述了工艺参数,微量元素和稀土元素对Al-mg合金机械性能、特别是对其耐蚀性能的影响。     

工程融资决策模糊数学模型

利用模糊数学原理和模糊数学评审模型中的某些方法，建立了工程融资决策模糊数学模型，可对不同融资方案进行综合评价。模型采用问卷方法计算参加评审的专家的权重，采用不等权专家信息后处理技术处理专家评议结果。     

老年前期女性血红蛋白正常值与地理因素关系

为制定中国老年前期女性血红蛋白正常参考值的统一标准提供科学依据，章收集了中国161个单位用氰化高铁血红蛋白(HiCN)法测定的17019例老年前期女性血红蛋白正常参考值，运用相关分析和回归分析的方法，研究了其与地理因素的关系，发现老年前期女性血红蛋白正常参考值与中国地理因素之间有很显的相关关系(F=123．03)。用逐步回归分析的方法得出回归方程：^Y=91．8 0．007540X1 0．005186X2 0．4540X3-0．63504，Y的预测区间为[^Y-15.7，^Y 15．7]。如果知道了中国某地的地理因素，就可以用回归方程估算这个地区的血红蛋白正常参考值．依据血红蛋白正常参考值与地理因素的依赖关系把中国分为青藏区、西南区、西北区、东南区、华北区、东北区等六个区。     

Identification of novel SINEs from Cyprinidae and their evolutionary significance

Short interspersed nuclear elements (SINEs) are widespread among eukaryotic genomes. They are repetitive DNA sequences that have been amplified by retrotransposition. In this study, a class of SINEs were isolated from the Opsariichthys bidens genome, and named Opsar. Sequence analysis confirmed that Opsar is a new class of typical SINEs derived from tRNA molecules. With the tRNA-derived region of Opsar and through BLASTN search, we further identified Zb-SINEs from the zebrafish genome, which includes two groups: Zb-SINE-A and Zb-SINE-B. The Zb-SINE-A. group comprises subfamilies of -Al--A5, and the Zb-SINE-B group is a dimer of the tRNA -derived region and shares a similar dimeric composition to Alu. Zb-SINEs are composed of three distinct regions: a 5' end tRNA-derived region, a tRNA-unrelated region and a 3' end AT-rich region. The flanking regions are AT rich. The average length of Zb-SINEs elements is about 340 bp. Zb-SINEs account for as much as 0.1 % of the whole zebrafish genome. About 70% of the Zb-SINEs are on chromosomes 11, 18, and 19. These Zb-SINEs were characterized by PCR and dot hybridization. The distribution pattern of Zb-SINEs in genome strongly supports the master genes model. The tRNA-derived regions of Opsar and Zb-SINEs were compared with the tRNAAla gene, and they showed 76% similarity, indicating that Opsar and Zb-SINEs originated from an inactive tRNA sequence or a tRNA -like sequence. In view of the evolutionary status of zebrafish in the Cyprinidae, we deduced that Zb-SINEs were a very old class of interspersed sequences.     

Δf与df的等价条件

讨论了ｎ元实函数ｆ（ｘ１，ｘ２，…，ｘｎ）的Δｆ与ｄｆ的等价条件，所得结果是一元函数相应结果的推广．     

薏苡的研究进展(综述)

从栽培、育种、组织培养、生理生化、细胞学、化学成分、药理作用及食品开发等方面对薏苡的研究进行了综述。     

计算断裂力学进展

论述了计算断裂力学的产生和研究内容，并较全面地综述了计算断裂力学在算法研究方面所取得的成果、发展水平以及发展趋势等问题．     

江西省会昌县地质灾害的形成条件和影响因素分析

地质灾害点主的形成条件主要有地形地貌条件、地层岩性条件、构造条件;影响因素主要有降雨因素、地表水作用、人为因素(人工切坡、采矿);最后简要论述了岩溶塌陷、地裂缝灾害形成条件及影响因素。     

机械热处理工艺的发展及弛豫-析出-控制相变技术

简述了机械热处理(Thermomechnical control Process,TMCP)工艺的基本概念及其应用;回顾了它的发展历史及主要的工艺流程;论述了机械热处理工艺的物理冶金现象,最后分析了TMCP工艺的最新发展—弛豫—析出—控制相变技术(RPC)的基础研究。