利用阻尼技术提高机壳的动态稳定性

系统存在共振响应时其振幅和薄弱环节的应变应主要取决于阻尼。通过声强分布,运转振型和模态振型分析以及噪声和振动的互谱分析可确定其动态薄弱环节,通过在该处粘贴约束阻尼结构可使整机的降噪任务减低七分之三。     

Simulating FAS-induced apoptosis by using P systems

In contrast to differential equations, P systems are an unconventional model of computation which takes into consideration the discrete character of the quantity of components and the inherent randomness that exists in biological phenomena. The key feature of P systems is their compartmentalised structure which represents the heterogeneity of the structural organisation of the cells, and where one can take into account the role played by membranes in the functioning of the system, for example signalling at the cell surface, selective uptake of substances from the media, diffusion across different compartments, etc. We show here that P systems can be a reliable tool for Systems Biology and could even outperform in some cases the current simulation techniques based on differential equations. We will also use a strategy based on the well known Gillespie algorithm but running on more than one compartment called Multi-compartmental Gillespie Algorithm.     

First-Principles Prediction of High-Pressure Phase of CaC6

The lattice dynamics of rhombohedral GaG6 is studied as a function orpressure to probe Its high pressure phase with low superconducting transition temperature using the density functional liner-response theory. The pressureinduced phase transition in CaC6 is attributable to the softening transverse acoustic （TA） phonon mode at the zone boundary X （0.5, 0.0, 0.5） point. The high pressure phase is then explored by performing fully structural optimization in the supercell which accommodates the atomic displacements corresponding to the eigenvectors of the unstable mode of TA（X）. The high-pressure phase is predicted to be a monoclinic unit cell with space group P21/m.     

低聚壳聚糖金属卟啉络合物的制备及抗肿瘤细胞活性研究

制备了低聚壳聚糖金属（铜、钴）卟啉络合物,通过紫外-可见光谱和红外光谱对其进行了表征,采用SRB细胞染色法研究了低聚壳聚糖金属（铜、钴）卟啉络合物对人体肝癌细胞Bel-7721的毒活性.结果表明,系列化合物均对肝癌细胞Bel-7402有较强的抑制生长活性,IC50值均小于100μg/mL,在10~30μg/mL范围内,是一类具有应用前景的抗肿瘤药物前体.     

三维地震勘探在淮北煤田的应用及效果

三维地震勘探技术引入煤矿采区勘探是解决煤矿地质构造问题的一种行之有效的勘探手段。已在煤矿采区勘探中取得了显著的地质效果和可观的经济效益,解决地质问题能力已为煤矿生产所广泛证实。     

中频差Zeeman双折射双频激光干涉系统的实验研究

Zeeman双折射双频激光器能够输出3~40 MHz频差的双频激光,可用作高测速双频激光干涉仪的光源。针对这种激光器的特点,以频差约7 MHz的Zeeman双折射双频激光器为干涉仪的光源,建立了中频差双频激光干涉仪测量系统。经过与商用HP5528A双频激光干涉仪的比对测量实验得出,中频差双频激光干涉仪实验测量系统测量线性度小于0.002%,测量的标准不确定度小于0.1μm,证明了中频差双频激光干涉系统的可行性和针对这种光源采用的设计方案的正确性。     

Genetic background of phenotypic variation

A noteworthy feature of the living world is its bewildering variability. A key issue in several biological disciplines is the achievement of an understanding of the hereditary basis of this variability. Two opposing, but not necessarily irreconcilable conceptions attempt to explain the underlying mechanism. The gene function paradigm postulates that phenotypic variance is generated by the polymorphism in the coding sequences of genes. However, comparisons of a great number of homologous gene and protein sequences have revealed that they predominantly remained functionally conserved even across distantly related phylogenic taxa. Alternatively, the gene regulation paradigm assumes that differences in the cis-regulatory region of genes do account for phenotype variation within species. An extension of this latter concept is that phenotypic variability is generated by the polymorphism in the overall gene expression profiles of gene networks. In other words, the activity of a particular gene is a system property determined both by the cis-regulatory sequences of the given genes and by the other genes of a gene network, whose expressions vary among individuals, too. Novel proponents of gene function paradigm claim that functional genetic variance within the coding sequences of regulatory genes is critical for the generation of morphological polymorphism. Note, however, that these developmental genes play direct regulatory roles in the control of gene expression.     

广西农业机械化本科人才培养模式的创新建设与研究

根据广西农业现代化发展对人才的需求,构建以现代农业高级工程技术人员的基本素质教育为核心,以工程技术教育和基本技能训练为向导的农业机械化及其自动化专业创新型专业人才培养模式.     

创新远不仅仅是科技部门的事情——京沪两地专家学者纵论“我们距离创新型国家有多远”

五年前的全国科技大会上，胡锦涛总书记发表了坚持走中国特色自主创新道路，为建设创新型国家而奋斗的重要讲话，提出了“2020年进入创新型国家行列”的宏伟目标。在这一目标已经过去五年的时候，不由地要问：我们距离“创新型国家”还有多远？     

县级电网无功优化建设工程分析

凤县电网根据电压质量和无功电力规划纲要要求,从全网无功分布和负荷的实际现状入手,按照＂全面规划、全网优化、分级补偿、就地平衡＂的原则,组织开展了全县区域内电网电压无功优化项目的试点建设,取得了较好的效益。笔者针对工程有关情况进行了总结和分析,为县级电网开展无功优化建设提供有益参考。