人发中钙、镁的原子吸收光谱测定的干扰及其消除

本文研究了不同量的K,Na,Al,SiO_3~(2-),PO_4~(3-),SO_4~(2-)对火焰原子吸收光谱测定人发中Ca,Mg含量的影响.结果表明Al,SiO_3~(2-)对Ca,Mg的吸收值,PO_4~(3-)对Ca的吸收值,有负干扰,加入La(Ⅲ)或Sr(Ⅱ)可消除干扰.其余元素皆无影响.测定出人发中Ca,Mg含量的变动系数(n=10)及回收率(n=9)分别为3.4～5.9％,1.5～2.9％和93.1～100.8％,93.9～105.9％.     

矩阵分光光度（CPA）法同时测定痕量铜,铋,铁

以金属离子Ｍ,２－（３,５－二溴吡啶偶氮－２）－５－二乙氨基苯酚（３,５－ｄｉＢｒ－ＰＡＤＡＰ）和聚乙二醇辛基苯基醚（ＯＰ）的三元络合物为显色体系,用矩阵分光光度（ＣＰＡ）法研究了共存痕量铜、铁、铁３元素的测定,并对实际铅锭样品中的痕量杂质进行了测定,得到了较满意的结果。     

一种快速高精度立体视觉光条匹配算法

提出一种用于视觉检测的快速高精度立体匹配算法,利用投影和透视变换理论以及矩阵转换知识建立了摄像数学模型及双目视觉传感器模型,并给出摄像机模型中各种参数的求解方法;在外极约束理论的基础上,提出了外极斜率匹配方法,从而实现空间光条快速精确匹配。实验取得了令人满意的结果,并且该项技术已成功地应用于国家“８６３”重点攻关项目。     

The diploid genome sequence of an Asian individual

Here we present the first diploid genome sequence of an Asian individual. The genome was sequenced to 36-fold average coverage using massively parallel sequencing technology. We aligned the short reads onto the NCBI human reference genome to 99.97% coverage, and guided by the reference genome, we used uniquely mapped reads to assemble a high-quality consensus sequence for 92% of the Asian individual's genome. We identified approximately 3 million single-nucleotide polymorphisms (SNPs) inside this region, of which 13.6% were not in the dbSNP database. Genotyping analysis showed that SNP identification had high accuracy and consistency, indicating the high sequence quality of this assembly. We also carried out heterozygote phasing and haplotype prediction against HapMap CHB and JPT haplotypes (Chinese and Japanese, respectively), sequence comparison with the two available individual genomes (J. D. Watson and J. C. Venter), and structural variation identification. These variations were considered for their potential biological impact. Our sequence data and analyses demonstrate the potential usefulness of next-generation sequencing technologies for personal genomics.     

High precision topographic data on Lop Nor basin＇s Lake ＂Great Ear＂ and the timing of its becoming a dry salt lake

High precision elevation measurements using DGPS were carried out along three representative tran-sects for the ＂Great Ear＂ area, a dry salt lake within the Lop Nor basin. Results indicate that the Lop Nor basin is only 5.2 m deep and its lowest point occurs at the center of the ＂Great Ear＂. In addition, the basin is asymmetric-steeper in the southwest （0.19‰） and gentler in the northeast （0.09‰）. Points along the same ＂Great Ear＂ ring were found to have an identical elevation value, but different when from different ones （lower towards the center）. The spacing of the ＂Great Ear＂ rings was found to be closely related with the surface steepness. The closer the ＂Great Ear＂ rings are spaced, the steeper the ground surface, and vice versa. These findings support the argument that the ＂Great Ear＂ rings are the former shoreline trails left behind by Lop Nor water during the last few episodes of recession towards its total dry up. A comprehensive analysis of the high precision elevation data, historical accounts, aerial and satellite photographs and imagery, and official topographic maps of the study area suggests that the ＂Great Ear＂ area in the Lop Nor basin was incorrectly mapped as being covered by a great body of water on the 1963 topographic maps. A re-interpretation of the 1958 aerial photographs and newer remote sensing imagery indicated that the ＂Great Ear＂ ring structure was already in place in 1958 and it continued to appear on the subsequent remote sensing data without any major changes. It is estimated that lake water in the ＂Great Ear＂ area of the Lop Nor basin disappeared between the late 1930s and early 1940s.     

Advances in the study on induced pluripotent stem cells

Recently, the study on ＂induced pluripotent stem cells＂ （iPS cells） has made a great breakthrough, and it is considered as a new milestone in the history of life science. This progress has updated our traditional concepts about pluripotency control, and provided people with a brand-new strategy for somatic cell nuclear reprogramming. In virtue of its availability and stability, this method holds great potential in both biological and clinical research. In order to introduce this rising field of study, this paper starts with an overview of the development of iPS cell establishment, describes the key steps in generating iPS cells, elaborates several relevant scientific issues, and evaluates its current restrictions and promises in future research.     

推进学校又好又快发展的有效策略思考

当前,要努力学习贯彻党的十七大精神,以科学发展观为指导,切实有效地促使学校沿着又好又快的方向发展.具体讲,要以有效发展理论为支撑,解放思想,更新观念,搞好学校的综合改革;要开拓创新,求真务实,处理好稳定与发展的关系,推进学校又好又快发展.     

基于服务质量五差距模型的饭店服务质量提升对策

服务质量是饭店生存和发展的生命线。随着饭店供给市场竞争的日益激烈和消费市场的日益成熟,继续提升我国饭店的服务质量已成为行业发展的必然选择。本文在详细阐述饭店服务质量内涵的基础上,从剖析P．Z．B服务质量模型所提出的五个差距产生的原因入手．从反面的角度指出了饭店企业应该从四个方面开展工作：转变管理人员错误观念、建立顾客导向型的全面质量管理体系、强化培训教育、加强沟通管理,以达到消除差距、提升服务质量的目标。     

不同形貌纳米SnS_2的溶剂热法合成及表征

以氯化锡和硫氰酸铵作为原料,溶剂热法分别合成SnS2纳米片,纳米颗粒及花状结构纳米晶体。采用XRD、TEM和FESEM等手段对粒子的结构与形貌进行表征,并研究了溶剂对SnS2形貌的影响。