Results 1 to 10 of about 2,074 (144)
FDI outflows and international trade nexus: Empirical evidence from country income groups [PDF]
, 2022 Relevance. Outward foreign direct investment (OFDI) and international trade are traditionally viewed as key drive of economic integration and globalization. At the same time, the relationship between these phenomena is ambiguous both from theoretical and
Drapkin, Igor M. +1 more
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Exploring the Innovative Development of Russian Regions: A Spatial Regression Analysis Using the Cobb-Douglas Model [PDF]
, 2023 Relevance. Extensive research has focused on evaluating and modeling innovative processes in territorial systems. However, an underexplored aspect is the assessment of spatial effects resulting from neighboring territories and the modeling of inter ...
Naumov, Ilya V., Nikulina, Natalia L.
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Methods and Research Hotspots of Forensic Kinship Testing [PDF]
, 2023 Kinship testing is widely needed in forensic science practice. This paper reviews the definitions of common concepts, and summarizes the basic principles, advantages and disadvantages, and application scope of kinship analysis methods, including identity
Ran LI, Hong-yu SUN
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Zhejiang Daxue xuebao. Lixue ban, 2022 为加快张量积型Said-Ball曲面渐近迭代逼近法的收敛速度，探讨了张量积型Said-Ball曲面渐近迭代逼近法的预处理技术。首先利用对角补偿约化技术构造了预处理子，然后结合矩阵Kronecker积性质，采取预处理渐近迭代逼近法求解张量积型Said-Ball曲面。为进一步降低计算量并提高算法的稳定性，利用广义极小残差法求解预处理方程，得到预处理渐近迭代逼近法的非精确求解方法。分析了预处理渐近迭代逼近法及非精确求解方法的收敛性。最后用数值实例说明预处理子能大大减小迭代矩阵的谱半径 ...
QUANHaorong(全浩荣) +4 more
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The philosopher's stone of entrepreneurship: achieving economic growth in Europe [PDF]
, 2022 This study aims to assess the impact of perceived opportunities and entrepreneurship as a good career choice on the economic growth of European countries. A quantitative methodology was used.
Gomes, Sofia, Lopes, João M.
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现代经济管理, 2021 招标采购实施过程风险是指由实施过程中的不确定因素所带来的实际结果与预期目标的可能性偏离。对过程风险的系统化分析与控制，将大幅度提升专业招标机构的服务质量和管理水平，并极大助力其由程序型向顾问型的转型发展。本文通过流程图法对招标采购过程中的主观风险因素进行风险识别，运用层次分析法建立针对识别结果的阶梯层次模型，结合风险矩阵法构建判断矩阵，整个过程借助yaahp软件进行计算，针对判断矩阵结果输出给出相关解决办法。
彤 佟 +4 more
semanticscholar +1 more source
结合主成分分析法(PCA)和正定矩阵因子分解法(PMF)的鄱阳湖丰水期表层沉积物重金属源解析
, 2020 为识别表层沉积物重金属的来源以及量化源贡献，选取鄱阳湖丰水期表层沉积物为研究对象，测定14种重金属（V、Cr、Co、Ni、Cu、Zn、Sr、Mo、Cd、Sb、W、Pb、Hg和As）的含量，分析其污染及空间分布特征，并利用主成分分析法（PCA）和正定矩阵因子分解法（PMF）对沉积物重金属进行源解析.结果表明：除V和Cr外，Cd、Mo、Hg、Cu、Pb、Zn、W、Sr、As、Ni、Co和Sb的平均含量分别为江西省土壤背景值的5.7、2.2、1.9、1.8、1.5、1.5、1.4、1.3、1.3、1.2、1 ...
匡荟芬 +7 more
semanticscholar +1 more source
Fitting and fairing quad-meshes by matrix weighted NURBS surfaces(矩阵权NURBS曲面的拟合与光顺)
Zhejiang Daxue xuebao. Lixue ban, 2023 介绍了利用矩阵权非均匀有理 B-spline（non-uniform rational B-spline，NURBS）曲面拟合与光顺带法向的网格数据。通过输入带法向的规则四边形网格，以网格的顶点为曲面的控制顶点，用法向信息计算每个控制顶点对应的矩阵权，构造矩阵权NURBS曲面。与传统NURBS曲面相比，矩阵权NURBS曲面具有拟柱面精度，当数据均匀采样自光滑曲面时，构造的矩阵权NURBS曲面具有较好的光顺性且能很好地拟合网格模型；当输入的网格数据掺杂噪声时 ...
董国鑫(DONG Guoxin) +1 more
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Dizhen xuebao, 2022 研究了构建时域谱单元质量特性模型的数学机制，针对时域切比雪夫谱单元和勒让德谱单元建立了一种直接导出谱单元一致质量矩阵和集中质量矩阵的统一数学方法，对比分析两种谱单元质量特性模型的特征，并从物理角度探讨了谱单元质量特性模型的合理性。研究表明，数值积分点与谱单元节点选取是否一致是决定时域谱单元形成一致质量模型或集中质量模型的根本原因，当采用高斯-勒让德积分计算谱单元质量模型时将导出一致质量矩阵，而采用高斯-洛巴托积分则导出集中质量矩阵。而集中质量模型更具有物理合理性，两种谱单元质量特性模型优劣相当 ...
Hongjing Li, Jingxiong Wang
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Zhejiang Daxue xuebao. Lixue ban, 2019 压缩感知理论中降低信号维数的关键问题是构造有效的测量矩阵。在已知稀疏基的情况下，基于ETF （Equiangular Tight Frame） 框架的测量矩阵构造方法和稀疏信号重构过程均依赖于感知矩阵。为此，设计了一种基于共轭梯度法的感知矩阵优化方法，该方法简单易行，且所求结果的Gram 矩阵与目标Gram 矩阵更接近。实验结果表明，此感知矩阵优化方法在理论分析、实际图像应用及算法有效性上均具优势。
LIXinyi(李昕艺) +2 more
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