154 research outputs found

    Seasonal variability and its mechanisms of Kuroshio intrusion into the Taiwan Strait using the Lagrangian method

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    高温高盐黑潮水对台湾海峡的入侵,对海峡内的环流结构及生态系统具有极为重要的影响,黑潮水对台湾海峡的入侵已引起了国内外的广泛关注。然而现有的关于黑潮水入侵台湾海峡的研究多是通过水体温盐特性进行欧拉方法的分析,而通过拉格朗日方法的分析较少。此外,现有的研究只注意到了黑潮水从台湾海峡南部的入侵,从未考虑过黑潮水从台湾海峡北部入侵的可能性。本文旨在利用卫星追踪的海表漂流浮标轨迹数据及LTRANS粒子追踪模型模拟的示踪粒子试验结果,探究黑潮水从北部入侵台湾海峡的可能性、黑潮水入侵台湾海峡各种方式的季节变化,并根据示踪粒子试验结果选取黑潮水入侵台湾海峡的典型过程,结合长时间序列的HYCOM+NCODA再分...The high temperature and high salinity of the Kuroshio water has an important influence on the circulation structure and ecosystem of the Taiwan Strait. The Kuroshio intrusion to the Taiwan Strait has attracted wide attention both at home and abroad. Most of studies on the Kuroshio intrusion into the Taiwan Strait are the analysis based on water temperature and salinity by Eulerian method, but the...学位:理学硕士院系专业:海洋与地球学院_物理海洋学学号:2232014115129

    关联企业认定的国际比较与借鉴

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    关联企业认定,是转让定价税制的起点,虽然在实践中各个国家的具体作法可能有所不同,但大都把认定企业间是否存在关联关系作为对关联企业业务往来进行调整的前提。《联合国范本》和《经合组织范本》都把管理、控制和资本作为认定关联企业的依据,在这两个范本的基础上,..

    N-乙基壳聚糖的单晶

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    用光固化法制备N 乙基壳聚糖/聚丙烯酸复合膜.在复合膜中观察到单晶和悬挂着单晶片的微纤.单晶的长和宽约为300~400nm,比常见的晶粒尺寸小得多.与通常单晶的极稀溶液制备条件不同,该单晶是在复合膜中形成的.水的诱导结晶作用和体系的高浓度形成了一种几乎是无限缓慢的结晶条件,单晶正是由于这样条件才能得以形成

    吡啶-三唑Os(Ⅱ)配合物的光谱性质和取代基效应的理论研究

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    Optimization of Microwave-Assisted Extraction of Pectic Polysaccharides from Agave sisalana Perrine by

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    以剑麻纤维生产过程中产生的废渣为原料,采用微波辅助技术从中提取果胶。首先通过单因素试验考察选取影响因素和相关水平,然后采用三因素三水平的响应面法分析设计优化微波功率、提取时间、溶液pH值等因素的组合试验,对果胶提取条件进行优化和显著性分析,依据回归分析确定最佳提取工艺条件为微波功率534W、提取时间9.8min、pH1.3,在此工艺条件下,剑麻果胶的提取率为6.10%,其半乳糖醛酸含量和酯化度分别为75.3%和72.09%。Abstract:The microwave-assisted extraction of pectic polysaccharides from sisal wastes left over after fi ber production was investigated. Response surface methodology (RSM) based on a three-level, three-variable Box-Behnken design was applied to optimize three extraction conditions including microwave output power, extraction time and solvent pH. The optimum extraction conditions were found to be 534 W, 9.8 min and pH 1.3. The yield of ASP (pectic from Agave sisalana Perrine) under the optimized conditions was 6.10% and galacturonic acid content and esterifi cation degree of the extract were 75.3% and 72.09%, respectively.广西自然科学基金项目(2010GXNSFA013038;2011GXNSFA018051);广西博士研究生创新基金资助项目(105931001008);广西科技攻关项目(桂科攻1355003-15

    Electric-dipole transitions in 165Er

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    High-spin states of 165Er were studied using the 160Gd(9Be, 4n)reaction at beam energies of 42 and 45 MeV. The previously known bands based on the ν5/2-[523] and ν5/2+[642] configurations have been extended to high-spin states. Electric-dipole transitions linking these two opposite parity bands were observed. Relatively large B(E1) values have been extracted experimentally and were attributed to octupole softness

    Study of the νi13/2-1 band in 189Pt

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    High-spin levels of 189Pt have been studied with the in-beam γ-spectroscopy method via the 176Yb(18O,5n) reaction at the beam energies of 88 and 95 MeV. The previously known νi-131/2 band has been confirmed, and its unfavored signature branch extended up to the 13/2+ state. Within the framework of the triaxial particle-rotor model, the νi-113/2 band is suggested to be associated with the 11/2[615] configuration, and to have triaxial deformation

    Properties of the rotational bands in the transitional nucleus 189Pt

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    High-spin states in 189Pt have been studied experimentally using the 176Yb(18O,5n) reaction at beam energies of 88 and 95 MeV. The level scheme of189Pt has been revised significantly and extended to high-spin states.Rotational bands have been analyzed in the framework of triaxial particle-rotor model, and a γ ≈−30◦triaxial shape and a near-prolate shape have been proposed to the νi−113/2 and νf5/2(p3/2) bands, respectively. Two ΔI = 2 transition sequences with similar energies have been observed, and they have been proposed to be associated with the νi−213/2νf5/2(p3/2) configuration. The structure built on the νi−213/2νf5/2(p3/2) configuration could be interpreted theoretical calculations of the triaxial particle-rotor model if a near-oblate shape is assumed

    cuag分子筛化学吸附脱硫的络合机理

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    应用DFT研究了一系列含硫的杂环化合物(噻吩、苯并噻吩、二苯并噻吩和4,6-二甲基二苯并噻吩)以及苯分子在Cu(Ⅰ)-Y、Ag(Ⅰ)-Y分子筛上的化学吸附.计算采用16T分子筛簇模型(H22Si15AlO22),对过渡金属采用了赝势基组,在BLYP/DNP水平上完成.相互作用能的结果表明,阳离子交换的分子筛对含硫杂环芳香族化合物吸附能力的顺序为Cu(Ⅰ)-Y>Ag(Ⅰ)-Y.两种吸附剂对噻吩类分子的吸附能力大于苯分子.噻吩衍生物的吸附能顺序依次为,4,6-二甲基二苯并噻吩<二苯并噻吩<噻吩<苯并噻吩,与实验结果相近.通过自然键轨道计算,研究了分子筛上担载的Cu(Ⅰ)、Ag(Ⅰ)金属离子与噻吩和苯分子之间的π-络合作用,分析比较了自然键电子给体-受体之间的二阶微扰稳定化能,并探索其络合机理

    Electric-dipole transitions in 165Er

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    High-spin states of 165Er were studied using the 160Gd(9Be, 4n)reaction at beam energies of 42 and 45 MeV. The previously known bands based on the ν5/2-[523] and ν5/2+[642] configurations have been extended to high-spin states. Electric-dipole transitions linking these two opposite parity bands were observed. Relatively large B(E1) values have been extracted experimentally and were attributed to octupole softness
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