共查询到20条相似文献,搜索用时 78 毫秒
1.
"一带一路"战略是目前我国实施全面对外开放的重要战略,将有力推动国内外地方区域的开放与发展。本文在分析"一带一路"战略建设的基础上,论述了郑州航空港经济综合实验区的发展现状,并从两个方面分析了郑州航空港区与国家"一带一路"战略的关系,最后提出了郑州航空港区融入"一带一路"战略的发展建议,以推动郑州建设综合交通枢纽和国际物流大通道的快速发展。 相似文献
2.
本文主要对郑州航空港区以及移动智能终端的发展现状和前景做了分析探讨,试图为整体环境下的郑州航空港区与移动智能终端发展方面做出建议和创新,以期为郑州航空港区信息产业与技术发展做出一定贡献. 相似文献
3.
4.
郑州是我国中部重要的城市和主要的交通运输枢纽,加快对郑州航空港区的规划建设是将郑州打造成国际化城市的战略选择,可以最大限度的利用全球范围内的资源,打造郑州新的经济增长核心,以推动郑州经济整体的高速发展,进而为提升国内经济发挥应有的作用。 相似文献
5.
本文通过对河南省电子商务产业目前发展现状进行深入分析,分别从总体规划、平台设计、配套体系、应用服务、跨境贸易和人才保障等方面提出加快郑州航空港区电子商务发展的策略,以助推整个航空港区的综合发展,这也是转变河南省经济发展方式的重要途径。 相似文献
6.
7.
本文从临空经济的发展动力出发,探讨郑州航空港临空经济对周边区域经济的带动作用(直接带动和间接带动)。其中,"直接带动"作用主要通过测算郑州航空港临空经济区的"宏观乘数效应",来考察临空经济对区域经济的带动效应;"间接带动"作用主要采用"波士顿矩阵"来衡量郑州航空港不同产业所处的位置和发展特点。然后从"机场因素""腹地资源回报率""港区发展回报率"和"空间结构因素"4个方面构建评价指标体系,对郑州临空经济的发展效率进行评价。通过探讨临空经济与区域经济的互动关系,以寻求对郑州航空港经济发展现状的新理解。 相似文献
8.
本文采用SWOT分析方法,在分析郑州航港经济综合实验区航空经济发展现状的基础上,深入探析了郑州航空港经济综合实验区发展航空经济面临的机遇和挑战,文章最后提出了支持航空经济发展的对策建议。 相似文献
9.
通过当前中国的51个航空港的产业布局现状了解现实中航空港选择产业布局的基本概况,并依此为据了解航空港区产业选择的基础性评价工具与方法,从而了解郑州航空港产业布局的基本思路。以高科技产业为例,重点分析郑州航空港对高科技产业的需求,高科技产业入驻航空港的优势以及高科技产业入驻郑州航空港的选择标准。 相似文献
10.
发展航空物流是郑州航空港建设的关键,本文主要通过对郑州航空港经济实验区建设和航空港物流产业发展现状进行了分析,提出郑州航空港物流业的发展路径。 相似文献
11.
根据密封舱改性渣土的三轴压缩实验数据,建立了基于优化方法的Duncan-Chang双曲线本构模型参数反演方法。为了解决参数识别反问题解的不稳定性问题,在Gauss-Newton优化迭代算法的基础上,提出了正则化参数反演方法。实际应用结果表明,所提出的反演方法具有较快的收敛速度和较强的鲁棒性,预测的实验模型变形与实验值吻合较好。 相似文献
12.
Guo-qiang Liu Xi Wang Ya-jie Gao Lei Wen Guang-yin Liu Jian-jie Zheng Peng Cen Ying Li 《矿物冶金与材料学报》2012,19(5):457-460
Spinel compounds LiNi0.5Mn1.3Ti0.2O4 (LNMTO) and Li4Ti5O12 (LTO) were synthesized by different methods. The particle sizes of LNMTO and LTO are 0.5–2 and 0.5–0.8 μm, respectively.
The LNMTO/LTO cell exhibits better electrochemical properties at both a low current rate of 0.2C and a high current rate of
1C. When the specific capacity was determined based on the mass of the LNMTO cathode, the LNMTO/LTO cell delivered 137 mA·h·g−1 at 0.2C and 118.2 mA·h·g−1 at 1C, and the corresponding capacity retentions after 30 cycles are 88.5% and 92.4%, respectively. 相似文献
13.
Kinetic parameters of oscillating reaction of amino acid- BrO3^——Mn^2+-H2SO4-acetone system 总被引:2,自引:0,他引:2
LIZongxiao YUANChunlan NIEFei 《科学通报(英文版)》2005,50(1):15-20
In the previous papers[1—3], the oscillating reactionusing amino acids as organic substrates was studied. Inorder to obtain information about the kinetic parameters ofoscillating reaction of amino acids in amino acid- BrO3 - ?Mn2 -H2SO4-acetone sy… 相似文献
14.
Preparation of Al<Subscript>72</Subscript>Ni<Subscript>8</Subscript>Ti<Subscript>8</Subscript>Zr<Subscript>6</Subscript>Nb<Subscript>3</Subscript>Y<Subscript>3</Subscript> amorphous powders and bulk materials 下载免费PDF全文
Amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were successfully fabricated by mechanical alloying. The microstructure, glass-forming ability, and crystallization behavior of amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). The isothermal crystallization kinetics was analyzed by the Johnson–Mehl–Avrami equation. In the results, the supercooled liquid region of the amorphous alloy is as high as 81 K, as determined by non-isothermal DSC curves. The activation energy for crystallization is as high as 312.6 kJ·mol?1 obtained by Kissinger and Ozawa analyses. The values of Avrami exponent (n) imply that the crystallization is dominated by interface-controlled three-dimensional growth in the early stage and the end stage and by diffusion-controlled two- or three-dimensional growth in the middle stage. In addition, the amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were sintered under 2 GPa at temperatures of 673 K and 723 K. The results show that the Vickers hardness of the compacted powders is as high as Hv 1215. 相似文献
15.
ZHANG Jie CHEN Jian WU JingBo KANG Lin XU WeiWei WU PeiHeng 《科学通报(英文版)》2007,52(3):303-306
We adopted a new method, acid etching process, to fabricate the intrinsic Josephson junctions based on the Bi2Sr2CaCu2O8 x single crystals. By soaking the crystals into the dilute hydrochloric acid, we fabricated a junction stack successfully, and meantime made the surrounding area insulated. A certain concentration of hydrochloric acid was used to maintain the roughness of the modified layer. The cur-rent-voltage characteristic was achieved through the four terminal measurement. We could control the junctions' number by changing the concentration and the soaking time. We also found that the thick-ness of the stack was equal to the average height of the insulation layer. Such a simple, convenient and controllable fabrication method with a high yield might widen the applications of the intrinsic Joseph-son junctions. 相似文献
16.
Investigation on high magnetoresistance Ni0.81Fe0.19 films grown on (Ni0.81Fe0.19)1-xCrx underlayers
LIHaifeng MAJidong YUGuanghua LONGShibin ZHAOHongchen ZHUFengwu 《科学通报(英文版)》2003,48(11):1087-1089
We have fabricated Ni0.18Fe0.19 films with (Ni0.18Fe0.19)1-xCrx films as underlayers by dc magnetron sputtering, the results show that larger anisotropic magnetoresistance (△R/R) values of Ni0.18Fe0.19 films are observed using the underlayers with Cr concentration of -36 at.% at an optimum underlayer thickness of -4.4 nm, the maximum AMR value is 3.35%. The results of atomic force microscope (AFM) and X-ray diffraction (XRD) show that the △R/R enhancement is attributed to the formation of large average grain size and the strong(111)texture in the Ni0.18Fe0.19 films. 相似文献
17.
以带附加气室的空气弹簧悬架为研究对象,按照物理模型建立带附加气室空气弹簧的数学模型,考虑到空气弹簧刚度的非线性,将该模型以空气弹簧非线性力的形式直接引入到1/4车辆模型。以提高车辆平顺性、行驶安全性及操纵稳定性的综合性能为目标,以附加气室容积为优化变量,设计带附加气室空气悬架的多目标优化模型;考虑到悬架性能各指标量在量纲与量级上的差异,对各指标量进行统一化处理,并采用线性加权和法将多目标函数转化为单目标评价函数。在MAT-LAB/Simulink中搭建系统仿真模型,采用遗传优化算法对典型工况下的最优附加气室容积进行寻优。优化结果表明,优化附加气室容积能有效提高悬架的综合性能,降低车身加速度、悬架动行程,但轮胎动载荷有所增加。 相似文献
18.
The microstructures and free-volume evolutions of as-cast and pre-annealed Zr65Al7.5Ni10Cu12.5Ag5 bulk metallic glasses during rolling deformation have been investigated. No phase transformation is detected in the as-cast/rolled specimen. However,the structural stability of the glass against plastic deformation is worse after pre-annealing,indicated by nanocrystallization in preannealed/rolled specimens with large deformation degrees. Moreover,with increasing deformation degree,the free-volume content in a pre-annealed/rolled specimen increases at a lower average rate than that in an as-cast/rolled specimen. 相似文献
19.
QU Xiaosheng LI Jie WANG Zhiyong WANG Cunxin 《武汉大学学报:自然科学英文版》2007,12(3):511-514
A coordination complex was synthesized from NiCl2 and dipeptide glycylglycine(GG). It was characterized by element analysis, NMR and TG methods, and then was determined to be Ni(C4HsN2O3)2Cl2. Using an isoperibolic reaction calorimeter, the standard molar enthalpy of formation of Ni(GG)2Cl2(solid) has been determined to be -(1 674.66±2.02) kJ · mol^-1 at 298.15 K. 相似文献
20.
Work hardening is a well-known phenomenon occurring in crystalline metals during deformation,which has been widely used to increase the strength of metals although their ductility is usually reduced simultaneously. Here we report that the plastic strain of Zr41Ti14Cu12.5Ni10Be22.5 (at.%) bulk metallic glasses has been increased from 0.3% for the as-cast sample to 2.5%-8.0% for samples that have experienced pre-deformation under constrained conditions. The pre-deformed glassy alloys possess more free volume and abundant introduced shear bands,which are believed to promote the activation of shear bands in post-deformation and result in an increase in plasticity. The orientation of the pre-introduced shear bands relative to the loading direction will affect the deformation behavior of pre-deformed samples. The present results show that pre-deformation of this glassy alloy will result in work toughening. This work toughening effect can be removed by isothermal annealing at a sub-Tg (glass transition) temperature,which causes annihilation of free volume and healing of shear bands. 相似文献