Results 51 to 60 of about 14,756 (169)

Analysis of tax increase in the perspective of industry transformation——Base the data of Wuxi [PDF]

open access: yes, 2015
改革开放以来,中国经济保持了30多年的资本拉动型高速增长,只是到近年才开始进入中速增长,从横向的世界范围内对比,我国的经济增速仍然处于高位运行。一直以来我国税收增长处于一种超GDP增长的态势,这种态势随着2008年经济危机发生出现了拐点,税收增长速度开始下降,可以说我国的税收增长也进入了一种“新常态”,经济总量导引的税收增长模式难以为继。目前我国经济正在从总量增长模式逐步向产业结构性调整模式转变,我国产业转型正在发生内涵性的改变,从原来注重三大产业结构比重的水平性变化向更具创新力、竞争性的层次性变革 ...
查琴琴
core  

Hierarchical Structured TiO2/Boron‐Doped Diamond for Efficient Photo‐Electrocatalytic Degradation

open access: yesRare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT The discharge of refractory organic dye wastewater poses a significant threat to the ecological environment, necessitating the development of efficient treatment technologies. Herein, a uniform TiO2 array (TiO2‐AR) electrode is fabricated using a combination of magnetron sputtering and a mask plate process with a boron‐doped diamond (BDD ...
Haiming Sun   +10 more
wiley   +1 more source

薄板结构弹簧操动机构结构优化

open access: yesGaoya dianqi, 2014
结合设计制造薄板结构弹簧操动机构的实践经验,论述了薄板结构弹簧操动机构设计制造中有效的结构优化方法,并提供了一些具体应用案例。简单的结构优化方法,可以达到较为理想的设计和应用目的,能够有效促进薄板结构在弹簧操动机构中的应用。
吴小钊   +4 more
doaj  

probability neural network based on particle swarm optimization algorithm [PDF]

open access: yes, 2016
标签分布学习是近几年发展起来的解决多标签分类问题的方法。该方法基于这样的假设:属于不同标签的实例可能会存在部分的共同特征,因此在学习过程中,每个实例都可以对不同的标签做出贡献,这极大地降低了学习的难度。条件概率神经网络作为解决这个模型的算法,在进行分类时具有独特的优势,然而如何对其进行有效的训练,从而找到最优参数却是一个困难的问题。 本文对条件概率神经网络的优化进行了研究,在考虑标签分布的性质和条件概率神经网络的结构特点之后,从三个方面改进了条件概率神经网络,并将改进的条件概率神经网络应用于年龄估计问题,
徐骏捷
core  

A Dual‐Strategy of Iodine Doping and Electrolyte Additive Enabling Fast Reaction Kinetics and Robust Interface for Li‐Se Batteries

open access: yesRare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT Lithium‐selenium (Li‐Se) batteries have attracted considerable attention due to their high theoretical specific capacity and the intrinsically good electronic conductivity of selenium. Nevertheless, low active‐material utilization, parasitic side reactions, and sluggish reaction kinetics hinder their practical application.
Yanan Fu   +8 more
wiley   +1 more source

基于WCA优化算法的空间桁架结构优化设计

open access: yesJianzhu Gangjiegou Jinzhan, 2014
群智能优化算法已被证实可以用于解决实际工程的优化问题。水循环算法可对约束问题进行求解。基于自然界中水循环过程提出的一种新型智能优化算法———水循环算法(WCA),研究了其应用于空间桁架结构优化设计问题的可行性及有效性,论文对两个空间桁架结构进行了截面优化计算分析,并与已有文献优化结果进行了比较,研究结果表明:WCA优化算法相对于群搜索算法(GSO)、启发式粒子群优化算法(HPSO)等优化算法能够提供更快的收敛速度,收敛结果也更好。
章纯, 刘锋, 廖国维, 李丽娟
doaj  

The Research on Business Model Innovation for Promoting the Industrial Park Development —A Case Study on Shekou Industrial Zone [PDF]

open access: yes, 2015
经济增长的动力来源于技术进步与创新。对国家而言,意味着不断融入全球产业分工体系,顺应经济发展规律,进行产业转型升级。上世纪80年代以来,我国各地政府成立大量的产业园区,抓住全球产业转移的机遇,促进了国民经济高速发展。但是,随着中国进入工业化中后期,中国产业园区的发展暴露了很多问题,很多园区企业仅限于简单的产业“扎堆”,因为缺乏良好规划协调,没有形成聚集效应,没有产生平台增幅效应,面对全球经济一体化和互联网时代新经济浪潮冲击显得缺乏手段,应对乏力,对城市区域一体化的“产城融合 ...
贺洪涛
core  

Cavity‐Confined Indium Single‐Atom Catalysts Enable Localized Electron Enrichment for Highly Efficient and Selective Photocatalytic CO2 Reduction

open access: yesRare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT Single‐atom catalysts are attractive for CO2 photoreduction due to their maximized atomic utilization and tunable electronic structures. In this study, indium (In) single atoms were incorporated into graphitic carbon nitride (CN) through an impregnation‐assisted thermal polycondensation strategy.
Xueying Guo   +6 more
wiley   +1 more source

The Impact of Venture Capital on the IPO Process of Private Enterprises in China [PDF]

open access: yes, 2016
当前我国经济步入“新常态”,经济结构优化升级,体现出创新驱动发展的新特点。在此背景下,民营企业数量剧增,成为“新常态”的主力军,对国民经济的贡献越来越多;同时资本和技术要素地位越来越重要,关注风险投资对民营企业的影响具有较高的研究价值。本文选题风险投资对我国民营企业首发上市的影响,集中关注风险投资给民营企业首发上市价格方面(发行价格、首日收盘价格)所带来的作用。风险投资是现代金融学研究的热点,关于其对被投资企业所起的作用国外有正面的认证监督功效假说和反面的逆向选择理论、市场力量假说 ...
黄小娟
core  

Unveiling Solidification Mechanism and Balanced Strength–Ductility Synergy of Eutectic High‐Entropy Alloys

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Eutectic high‐entropy alloys (EHEAs) have attracted significant attention due to their balanced mechanical properties and promising applications. Nonetheless, the correlation between the solidification mechanism of eutectic microstructures and their mechanical properties remains elusive.
Yi Qin   +15 more
wiley   +1 more source

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