摘要：This review summarizes a variety of experimentally identified gas‐phase catalytic cycles,all of which are mediated by atomic metal ions,bare metal clusters,metal oxide clusters or metal *** is placed on the latest advances in the unique catalytic reactivity of cluster‐confined single noble metal *** cycles discussed in this paper cover a wide range of inorganic and organic *** use of start‐of‐the‐art mass spectrometric instrumentation in conjunction with quantum chemistry calculations is also reported,as these techniques have determined the mechanistic details of the elementary steps of such catalytic *** important role of gas‐phase data in guiding the rational design of better‐performing catalysts in related condensed phase reactions is also *** particular,this review focuses on the following three topics:(1)the catalytic oxidation of carbon monoxide,(2)the catalytic functionalization of methane,and(3)catalytic decarboxylation.

摘要：Adsorption and activation of dinitrogen(N_(2)) is an indispensable process in nitrogen *** nitride species continue to attract attention as a promsing catalyst for ammonia ***,the detailed mechanisms at a molecular level between reactive nitride species and N_(2) remain unclear at elevated temperature,which is important to understand the temperature effect and narrow the gap between the gas phase system and condensed phase ***,the ^(15)N/^(14)N isotopic exchange in the reaction between tantalum nitride cluster anions Ta_(3)^(14)N_(3)^(-) and ^(15)N_(2) leading to the regeneration of ^(14)N_(2)/^(14)N^(15)N was observed at elevated temperature(393-593 K)using mass *** the aid of theoretical calculations,the exchange mechanism and the effect of temperature to promote the dissociation of N_(2) on Ta_(3)N_(3)^(-) were elucidated.A comparison experiment for Ta_(3)^(14)N_(4)^(-)/^(15)N_(2) couple indicated that only desorption of ^(15)N_(2) from Ta_(3)^(14)N_(4)^(15)N_(2)^(-) took place at elevated *** different exchange behavior can be well understood by the fact that nitrogen vacancy is a requisite for the dinitrogen activation over metal nitride *** study may shed light on understanding the role of nitrogen vacancy in nitride species for ammonia synthesis and provide clues in designing effective catalysts for nitrogen fixation.

摘要：提出了一种简单、快速、高效的基于草绘设计的概念模型创建方法.该方法模仿传统的纸笔草绘设计方式,允许用户自由地在笔式用户界面上勾画特征笔划,然后根据笔划的形状和位置关系采用基于特征的实体建模方法构造不同的扫描特征体素.在此基础上,采用了基于意图捕捉的特征添加及切削机制创建复杂的实体模型,给出了一些关键算法的实现过程.实验结果表明:该方法能够较好地应用到联机三维概念模型快速创建过程中.

摘要：民族音乐是永儒布艺术创作的根基。潮尔、马头琴及蒙古族民歌,是永儒布交响乐的主要创作源泉。他的交响乐作品体现出丰厚的民族风格底蕴,具有史诗性和哲理性的审美本质。尊崇自然、敬畏生命和爱恋家园,既是永儒布交响乐作品的核心内容,也是其交响乐作品所体现的典型的审美情结。向民族文化传统寻根,创作立意与民族传统紧密相连,是永儒布交响乐创作中的基本遵循。

摘要：应用遗传算法对锯齿型板翅式换热器的结构进行了优化设计.以预定的传热量、两侧压降、体积等设计要求为适应度函数,通过对设计变量构成的种群个体进行适应度评估以及选择、交叉、变异等遗传操作,得到符合设计约束的换热器最优结构参数(如翅高、翅长、间距,以及长、宽、高等).此外,对10次计算得到的设计参数进行了统计分析.结果表明:相关结构参数的不确定度很小,应用遗传算法可以快速方便地对紧凑式换热器的几何结构参数作出符合设计要求的选择.

摘要：In order to enhance the glutathione peroxidase（GPX） catalytic activity of the selenium-containing single-chain variable fragments（Se-scFv）, a novel human scFv was designed on the basis of the structure of human antibody and optimized via bioinformatics methods such as homologous sequence analysis, three-dimensional（3D） model building, binding-site analysis and docking. The DNA sequence of the new human scFv was synthesized and cloned into the expression vector pET22b（＋）, then the scFv protein was expressed in soluble form in Escherichia coli BL21（DE3） and purified by Ni2＋-immobilized metal affinity chromatography（IMAC）. The serine residue of scFv in the active site was converted into selenocysteine（Sec） with the chemical modification method, thus, the human Se-scFv with GPX activity was obtained. The GPX activity of the Se-scFv protein was characterized. Compared with other Se-scFv, the new human Se-scFv showed similar efficiency for catalyzing the reduction of hydrogen peroxide by glutathione. It exhibited pH and temperature dependent catalytic activity and a typical ping-pong kinetic mechanism.

摘要：蒙古族风格交响乐作品,是作曲家在长期写作实践中创作出的一系列以蒙古族文化内涵为表现内容,以蒙古族风格的民歌、器乐曲旋律或自创的带有蒙古族风格的旋律作为作品主题并贯穿发展的交响乐作品。这些作品所表达的是作曲家眼中的蒙古族历史、英雄、自然风貌、民俗风情等一切涉及蒙古族文化所包含的内容,表现的是蒙古族的精神、性格和气质,传达的是蒙古族的崇高审美理想,是蒙古民族的感情、特有文化和审美方式的升华。

摘要：目的探讨亲子绘画和创意手工疗法对学龄前期轻中度孤独症谱系障碍儿童核心症状及其母亲亲职压力和希望水平的影响。方法采用区组随机分组方法,将56对学龄前期轻中度孤独症谱系障碍儿童及其母亲随机分为试验组和对照组,每组各28对。对照组采用应用行为分析法进行干预;试验组在此基础上,采用亲子绘画和创意手工疗法。两组干预时间均为20周。采用孤独症行为评定量表(Autism BehaviorChecklist,ABC)、社交反应量表(Social ResponsivenessScale,SRS)、短式亲职压力量表(Parenting StressIndex-Short Form,PSISF)和herth希望指数量表(herth HopeIndex,HHI),评估干预前和干预后(20周的干预时间结束后)儿童核心症状及其母亲的亲职压力和希望水平。结果共49对母子参与了全程研究(试验组25对,对照组24对)。干预后试验组儿童社会交往维度、语言维度、社交沟通维度和社交动机维度得分及ABC总分和SRS总分均低于对照组(P<0.05)。干预后试验组母亲的亲职愁苦维度和亲子互动关系失调维度得分及PSI-SF总分均低于对照组(P<0.05),而试验组母亲的HHI总分及各维度得分均高于对照组(P<0.05)。结论在应用行为分析干预的基础上,采用亲子绘画和创意手工疗法可进一步改善学龄前期轻中度孤独症谱系障碍儿童的核心症状和社交互动,减轻母亲的亲职压力,提高其希望水平。

摘要：Joint inversion based on a correlation constraint utilizes a linear correlation function as a structural *** linear correlation function contains a denominator,which may result in a singularity as the objective function is optimized,leading to an unstable inversion *** improve the robustness of this calculation,this paper proposes a new method in which a sinusoidal correlation function is employed as the structural constraint for joint inversion instead of the conventional linear correlation *** structural constraint does not contain a denominator,thereby preventing a *** with the joint inversion method based on a cross-gradient constraint,the joint inversion method based on a sinusoidal correlation constraint exhibits good *** application to actual data demonstrates that this method can process real data.

摘要：以《水工混凝土结构设计规范》为依据,对预应力混凝土结构后张法钢绞线配置计算提出了简捷的计算方法,提高了设计工作效率.