Visualizing the Intellectual Structure in Innovation System Studies: A Journal Cocitation Analysis

A journal co-citation analysis of top cited journals in the innovation ecosystem discipline was conducted over three periods spanning the years of 2002 to 2019.Relevant data retrieved from the Web of Science database were analyzed according to the highly cited journals.The results of current study show that innovation ecosystem is muti-disciplinary with broad relations with other fields.Management,marketing,technology and innovation,information management,economy,entrepreneurship and sociology play an important role in innovation ecosystem field,given their position and role in the research network.The paper generates the added value mainly from the point of view of theory development.

Analysis of the Structure of Shakespeare's Sonnets

The sonnet is a kind of lyrics with restrict forms which cannot depart from the contents. Shakespeare's sonnets are like a valuable flower blossoming in the England poetry garden during the age of Renaissance and a bright pearl sparkling in the world's poetry treasury. This paper will analyze his sonnets from the perspective of the structure and then interpret the meanings behind those words, which can demonstrate the importance of the connection between the forms and the contents.

Data-Driven Structural Design Optimization for Petal-Shaped Auxetics Using Isogeometric Analysis

Focusing on the structural optimization of auxetic materials using data-driven methods,a back-propagation neural network(BPNN)based design framework is developed for petal-shaped auxetics using isogeometric analysis.Adopting a NURBSbased parametric modelling scheme with a small number of design variables,the highly nonlinear relation between the input geometry variables and the effective material properties is obtained using BPNN-based fitting method,and demonstrated in this work to give high accuracy and efficiency.Such BPNN-based fitting functions also enable an easy analytical sensitivity analysis,in contrast to the generally complex procedures of typical shape and size sensitivity approaches.

Study of the Porosity of the Tiles out of Vibrated Mortar by Microstructural Analysis

The promotion and the popularization of the micro concrete tiles in any locality obligation with a will of durable development pass by a standard of quality, which is based on the results of scientific and technical research taking account of local specificities. This work proposes to study the porosity of the micro concrete by micro structural analysis. From this study, it comes out that the variation of porosity compared to the ratio of the fine gravels (s/(s + g)) is decreasing. Indeed more the granular ratio increases less low is the density of pores of material. The decrease of porosity according to the granular rate is not infinite;it tends towards a minimum starting from a rate of fine gravel close to 50%. The results obtained justify well the ratio of fine gravel practised by tileries.

The Structural,Dielectric,Lattice Dynamical and Thermodynamic Properties of Zinc-Blende CdX(X=S,Se,Te) from First-Principles Analysis

The structural, dielectric, lattice dynamical and thermodynamic properties of zinc-blende CdX （X=S, Se, Te） are studied by using a plane-wave pseudopotential method within the density-functional theory. Our calculated lattice constants and bulk modulus are compared with the pubfished experimental and theoretical data. In addition, the Born effective charges, electronic dielectric tensors, phonon frequencies, and longitudinal opticaltransverse optical splitting are calculated by the linear-response approach. Some of the characteristics of the phonon-dispersion curves for zinc-blende CdX （X= S, Se, Te） are summarized. What is more, based on the lattice dynamical properties, we investigate the thermodynamic properties of CdX （X= S, Se, Te） and analyze the temperature dependences of the Helmholtz free energy F, the internal energy E, the entropy S and the constant-volume specific heat Cv. The results show that the heat capacities for CdTe, CdSe, and CdS approach approximately to the Petit-Dulong limit 6R.

Move-Step Structure of the Introduction Section of English Medical Science Research Articles Written by Chinese Researchers Published in International Journals

In the past decades,a number of researchers have tried hard to identify the move-step structure of different sections in research articles(RAs)from various disciplines.However,there is a very few amount of previous studies conducted on the move-step structure of the Introduction section of English medical science research articles(MSRAs)written by Chinese researchers published in international journals.In order to fill this gap,the present study aims to identify the moves,steps,and their structure of the Introduction section of English MSRAs written by Chinese researchers at Zunyi Medical University(ZMU)published in international journals.To create the target corpus of the present study,30 Introductions were purposively selected from 25 international medical science journals,which were published from 2007 to 2015.It is worth noting that all the authors are restricted to Chinese researchers only and at least one author must come from ZMU.The framework of Kanoksilapatham’s(2005)was adopted for the move-step analysis in the present study.The results demonstrated that these Introduction sections were generally written with three moves following the selected framework.In addition,there were two new steps that occurred in the Introduction section of these English MSRAs.In conclusion,the findings of the present study might provide a guideline for the research who plan to write English MSRAs for international articles more effectively.Moreover,the findings may provide valuable information for academic writing textbook designers as well.

Structural Analysis and Improved Design of the Gearbox Casing of a Certain Type of Tracked Vehicle

Loads on a gearbox casing of a certain type of tracked vehicle were calculated according to the engine＇s full load characteristic curve and the worst load condition where the gearbox operated while the tracked vehicle was running, and then stiffness and strength of the casing were analyzed by means of Patran/Nastran software. After a- nalysis, it was found that the casing satisfied the Mises ＇ yield condition; however, the stress distribution was hetero- geneous, and stresses near the bearing saddle bores of the casing were higher while those in other regions were much less than the allowable stress. For this reason, thicknesses of the casing wall on bearing assembling holes needed in- creasing, while those in other places can decrease. After much structural improving and re-analysis, the optimal casing design was found, and its weight decreased by 5% ; the casing still satisfied the Mises yield criterion and the stress distribution was more homogeneous.

An overview of soil erosion research in China through a lens of international journals

[Background]Soil erosion,the process by which soil is eroded,transported,and deposited by external forces like wind and water,is a widespread global phenomenon with significant environmental and economic impacts.Over the past two decades,China's soil erosion research has made significant strides,reaching a world-class level in both quality and quantity.However,there has been a lack of comprehensive studies summarizing the overall situation and development trends in this field.This study aims to fill that gap by providing an overview of the current status and trends in China's soil erosion research.[Methods]This study employed bibliometric methods to analyze 6588 journal articles on soil erosion in China,collected from the Scopus database.The analysis focused on several key aspects,including the number of publications,subject areas,leading research institutes,funding organizations,key research themes,and patterns of international collaboration.Additionally,network maps were generated using VOSviewer to visualize the intellectual structure and connections within the research field,offering insights into how different research topics and institutes are interconnected.[Results]The findings reveal a significant increase in the number of publications since the 1980s,rising from just 4 articles in 1981 to 699 articles in 2023.While soil erosion research is multidisciplinary in nature,the most popular subject areas were“Environmental Science”“Agriculture and Biological Sciences”and“Earth and Planetary Sciences”.The Chinese Academy of Sciences is the most productive institute,with several universities and government research institutes also making substantial contributions.The primary funding source was government organizations,with the National Natural Science Foundation of China being the largest funder.Journals focusing on water and soil,ecology,and environmental sciences were the primary platforms for publishing soil erosion research in China.Catena,Science of the Total Environment,Transactions of CSAM,and Acta Ecologica Sinica were the most productive journals.Six international collaboration networks were identified in this field.The largest network was from European Union,followed by the network with Hong Kong Special Administrative Region,Singapore,and the United Kingdom,and the rest were cooperation relationships between the two countries(regions).The major research themes identified were“soil erosion and land degradation”“erosion dynamics and drivers”“soil erosion process and mechanism”and“erosion monitoring technology”.Earlier research was heavily focused on topics such as“GIS”“remote sensing”“Cs-137”“landscape pattern”“vegetation restoration”“simulated rainfall”“loess plateau”and“black soil.”In contrast,recent studies have shifted towards“climate change”“ecosystem services”“soil erodibility”“gully erosion”and“RUSLE”.[Conclusions]This study offers a comprehensive overview of China's soil erosion research,serving as a valuable resource for researchers and policy-makers interested in understanding the knowledge structure and development trends in this field.Additionally,the study highlights emerging research topics and potential areas for future exploration,thereby guiding the direction of subsequent studies in soil erosion.

A search for evidence of small-scale inhomogeneities in dense cores from line profile analysis

In order to search for intensity fluctuations on the HCN（1-0） and HCO＋（1-0） line pro- files, which could arise due to possible small-scale inhomogeneous structure, long-term observations of high-mass star-forming cores S140 and S199 were carried out. The data were processed by the Fourier filtering method. Line temperature fluctuations that exceed the noise level were detected. Assuming the cores consist of a large number of randomly moving small thermal fragments, the total number of frag- ments is - 4 × 106 for the region with linear size - 0.1 pc in S140 and - 106 for the region with linear size - 0.3 pc in S 199. Physical parameters of fragments in S 140 were obtained from detailed modeling of the HCN emission in the framework of the clumpy cloud model.

全国市场VS区域市场:碳市场有效性的差异、成因及其对策

对碳市场有效性进行测度、把握碳市场运行效率,有利于进一步推动碳交易机制优化和效率提升。本文以全国碳排放权交易市场及8个区域试点碳市场为研究对象,以2021年7月16日至2023年6月16日碳配额成交均价为样本,运用结构突变检验法与重标极差分析法对各个碳市场整体与阶段运行效率进行测度。研究结果表明:全国碳市场整体运行效率偏低,仅第一阶段达到了弱式有效水平;在区域试点碳市场中北京碳市场达到弱式有效,若考虑结构突变点时,则上海、广东、湖北、深圳和重庆碳市场达到阶段性弱式有效。在此基础上,进一步剖析了全国碳市场有效性较低的影响因素,并有针对性地提出对策建议。

B/S结构下基于Web Services技术的空间分析方法的研究

文本重点研究了B/S体系结构下WebServices技术在GIS中的应用,分析了其中的关键技术,包括B/S体系结构、WebServices技术,进行了基于WebServices技术的GIS空间分析技术的研究,最后指出了基于WebServices技术的WebGIS发展前景。

基于PLS结构方程模型进行学术期刊评价的实证研究

文章用因子分析法对评价指标进行分类,构建PLS结构方程模型并对指标进行筛选,以图情类期刊为例对指标数据计算、分析和评价。研究结果表明,PLS的期刊评价和因子分析评价的结果一致性很高,PLS结构方程模型不仅能解决期刊评价指标之间存在多重共线性的问题,而且还能科学筛选评价指标,是进行学术期刊综合评价的一种十分有效的方法。

MIBS深度差分故障分析研究

给出了MIBS算法及故障分析原理,基于不同深度的故障模型,提出了3种针对MIBS差分故障分析方法,并进行实验验证。实验结果表明,由于其Feistel结构和S盒差分特性,MIBS易遭受深度差分故障攻击,最好的结果为在第30轮左寄存器导入1次4bit故障,故障位置和故障差分值未知,可将64bit主密钥搜索空间降低到224,经1min暴力破解恢复完整主密钥。此外,该故障分析方法也可为其他使用S盒的分组密码差分故障分析提供一定思路。

北京沙尘暴的干盐湖盐渍土源——单颗粒物分析和XPS表面结构分析

2002年3月20日北京特大沙尘暴565个单颗粒物分析结果表明,S和Cl是唯一呈现显著正相关的一对元素.同时含有S和Cl的单颗粒物检出率高达82.5%,其中S和Cl的含量还高于所有颗粒物平均值.同时含有S、Cl和Na的颗粒物检出率为62.0%,其中Na的含量更比所有颗粒物平均值高出1.4倍.PMF因子分析显示NaCl和Na2SO4是北京沙尘暴S和Cl显著相关的那些单颗粒物的主要成分.沙尘暴样品中SO42-和Cl-浓度呈高度线性相关.X射线光电子谱对气溶胶表面结构分析显示,Na和S在沙尘暴颗粒物表面的百分含量比北京非沙尘暴和内蒙古地区气溶胶样品高.这些同时含有S、Cl和Na,且S和Cl显著正相关,Na相对富集的颗粒物多数来自于沙尘暴途中所经过的其表层土成分富含氯化物和硫酸盐的干盐湖盐渍土地区.证明了北京沙尘暴不仅来自于其源头沙漠,沙尘暴所经过的包括干盐湖盐渍土的大范围干旱、半干旱地区的表层土也是其主要来源.

基于R/S分析的中国股市分形结构的实证研究

文章以中国股市的日收益率为研究对象,运用R/S研究方法对中国股市的分形结构进行实证分析研究。通过对R/S双对数曲线以及V统计量的的拟合,研究结果表明中国股票市场的收益序列均不服从正态分布,并且呈现出状态的持续性和长期记忆性,具有明显的分形特征。这种特征为进一步认识我国股票市场的收益的持续性、循环周期提供了一定的实证分析基础。

影响我国科技期刊入选SCI浅析

１问题的提出当今时代，随着世界格局的变化，各国都把科学技术作为国际竞争的制高点，以争取在新格局中占据有利地位。而被ＳＣＩ收录的科技论文的多寡，则看作为衡量一个国家的基础科学研究水平、科技实力和科技论文质量高低的硬指标，因而日益受到世界各国的重视。近年...

ITER过渡馈线S弯盒的结构优化设计和地震响应分析

在强度静力分析基础上,对S弯盒壁厚、加强筋间距等参数进行了优化设计和校核。在模态分析基础上,对模型进行了频谱分析和动态时程分析,获得地震动下确保结构安全运行的设计参数。

拱坝结构损伤的多测点R/S分析

为了研究大坝监测资料与结构完整性的关系,利用R/S分析法对实测资料时间序列进行分时段分析,根据计算的分形维数判断坝体结构的损伤程度。实例计算结果表明:大坝结构完整,实测资料的变化规律相似性越高,其分形维数越小;当大坝结构出现损伤,实测资料的变化规律越复杂,其分形维数越大;与传统的仿真模拟相比,R/S分析法更接近大坝实际工作性态,具有很强的适用性。

基于R/S分析的人民币外汇市场分形特征实证研究

针对人民币汇率时间序列的特征问题,提出了基于R/S分析的赫斯特(Hurst)指数作为测算判据的方法。选取样本区间为2005年7月21日至2007年12月31日,人民币对美元、欧元和日元的日汇率中间价数据为研究对象,样本数目共计为598个,进行了实证研究。实证结果为人民币对美元、欧元和日元汇率的赫斯特指数分别为0.64、0.61和0.62,关联尺度分别为1.42、1.34和1.37;表明人民币外汇市场具有明显的分形结构,三种汇率都有关联性,并表现出状态持续性。这弥补了有效市场理论的不足,并将对相关决策者有着参考作用。

基于B/S结构的考试成绩管理与分析系统的设计与实现

本文对基于B/S结构的考试成绩管理与分析系统的设计及其相关问题进行了探究,重点探讨了该系统结构与功能,论述了设计过程中的关键问题的解决方法。