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1 INTRODUCTION The reactivity of activated alumina adsorbent is closely related to its specific surface area: the larger the specific surface area, the better its activity and adsorbent capability are. However, in reality, the prac- tically available specific surface area or effective spe- cific area has relationship with its pore structure[1]. Since many reactant molecules are difficult to enter the pores to react with whose radius is shorter than certain critical value, the increase of p… 相似文献
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谢兰云 《数学的实践与认识》2014,(12)
利用我国31个省份2001-2010年的面板数据,使用空间滞后模型(SLM)研究了我国区域RD投入、空间溢出效应及吸收能力对经济增长的影响.研究结果表明我国各省份经济增长之间存在着高度的空间相关性,一个省份的RD投入不仅能够促进本地区的经济增长,还会通过技术溢出促进相邻地区的经济增长,同时一个地区吸收能力越强,其对该地区经济增长的影响也越大. 相似文献
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Mechanical properties of a closed-cellular sialic foamed ceramic are investigated by compressive tests. The sialic foamed ceramic under uniaxial stress compression shows brittleness and the flow stress increases with the strain rate. The engineering stress-engineering strain curve under uniaxial strain compression could be divided into three stages: linear elasticity, collapsed plateau and densification. The unloading elastic modulus, Poisson ratio and energy absorption ability are discussed. Shelly cellular material made by sialic foamed ceramic is applied into the stress distribution layer in the defense structure. Field explosion experiments are performed for the sand based stress distribution layer and shelly cellular material based layer. Compared with sand, the shelly cellular material reduces the peak stress of the blast wave. 相似文献
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创新补贴策略是政府鼓励企业创新的一种常见政策,考虑到企业内在的吸收能力与外部不同政府补贴策略方式的存在,本文以产学研合作创新方式为基础,通过建立三阶段博弈模型,利用模型解析与仿真分析讨论吸收能力与创新投入分配比例系数对政府补贴策略选择的影响。研究结果表明:无论政府采取哪一种补贴方式,均可以有效激励企业加大创新投入规模,并且企业的吸收能力与R&D投入、产量及社会福利均呈正相关关系;但是,吸收能力对利润及政府补贴的影响受限于补贴方式和企业的创新投入分配比例系数;此外,在创新产品补贴下,创新难度系数对政府补贴额度的影响并不明显,而创新产品补贴总体优于创新投入补贴。 相似文献
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人体主要从食物中吸收钙,一般食物钙在小肠上段特别是十二指肠被吸收。实验证明,小肠不同部位对钙的吸收能力是不同的,依次为十二指肠、空肠、回肠,但事实上大部分食物钙是在空肠和回肠被吸收的。这是因为空肠和回肠的吸收面积大,而且食物在这些部位停留的时间也较长。 相似文献
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在经济全球化的浪潮下,集群企业网络关系稳定性、网络关系强度、网络关系质量对吸收能力和企业创新绩效均有显著影响,吸收能力对企业创新绩效有显著影响且在集群企业网络关系特征与创新绩效之间起到中介作用。为此,集群企业应积极拓展有利于企业发展的关系网络,提高吸收能力,构建"集群企业网络关系特征—吸收能力—企业创新绩效"的机制系统。 相似文献
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LIUChao-Zhuo SHILi-Qun 《中国物理快报》2004,21(6):1035-1038
By using ion beam sputtering, an 85-A thick nickel layer was deposited on the Zr-A1 alloy (non-evaporablegetter) to improve the characteristic of the hydrogen absorption. The presputtering for 15rain to clean thesurface passivation layer and the vacuum heating treatment of the sample at 750℃ for 1 h for surface alloyingcan improve the ability of the gas absorption. The gas absorption experiments show fast absorption kinetics of thehydrogen pumping and good durability against contaminable gases. The Rutherford-back-scattering spectra andthe secondary ion mass spectroscopy demonstrate the formation of an alloy of Zr, A1, and Ni in the near-surfacearea after the thermal process. The elastic recoil detection analysis indicates that the sample holds the originalhigh capacity of hydrogen. 相似文献
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