Results 31 to 40 of about 7,460 (212)

Constructing boundary curves from complex mesh models for PDE-based shape reconstruction(网格模型PDE曲面重建中的边界曲线构造)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2014
利用偏微分方程(PDE)进行曲面拟合是计算机图形学研究领域中的常用方法,该类方法通过选取适当的边界条件来构造PDE,用PDE的解来表示几何曲面.基于网格简化方法和离散曲面测地线计算等技术,提出一种从网格模型提取PDE曲面片边界条件曲线的方法.首先,对复杂模型进行简化并分片处理;通过计算离散曲面的测地线为每个分片定义相应的PDE边界条件曲线,进而构造复杂模型的PDE拟合表面.最后,通过细分方法建立原模型的多分辨率表示.实验表明,该方法可以对具有不同几何复杂度的网格模型进行处理 ...
PANGMingyong(庞明勇)   +2 more
doaj   +1 more source

Research on Credit Spread of Corporate Bond Based on Reduced Form Model [PDF]

open access: yes, 2008
信用风险又称违约风险,是指由于参与交易的对手信用品质的不可预测而导致的损失,包括信用降级、无法支付债务和破产清算。随着企业债市场的快速发展,全球金融创新的不断加快,特别是美国次级住房抵押贷款债券市场危机的爆发,人们越来越认识到信用风险在资产定价及风险管理中占有重要的地位。虽然相对于欧美等成熟市场而言,我国债券市场还不发达,但现阶段我国资本市场发展迅速,这一领域的创新正不断涌现,所以研究信用风险对发展我国企业债市场有着重要的理论和现实意义。 本文在对结构化模型和简化模型进行比较之后 ...
蔡艳菲
core  

High Performance Catalyst Design by Artificial Intelligence for Acetylene Hydrochlorination

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT The rapid development of artificial intelligence (AI) has brought transformative contributions to society, revolutionizing various fields through its advanced computational capabilities and data‐driven approaches. In the field of materials science, AI has become a powerful tool that significantly accelerates the discovery of new materials by ...
Yuan Zhou   +12 more
wiley   +1 more source

基于颗粒阻尼技术的数控机床轻量化研究 [PDF]

open access: yes, 2018
随着数控机床向高精度、高速度和绿色化发展,轻量化数控机床的优势越来越明显。以ZN-XK2840数控龙门镗铣床为例,提出一种基于颗粒阻尼技术的数控机床轻量化设计方法。首先通过有限元法对常规数控机床结构的静态性能进行分析,对其壁厚进行优化,对轻量化的机床结构的静态性能进行分析,确保其最大变形量和强度满足使用要求;然后对常规数控机床的动特性如模态特性、谐响应进行分析。颗粒阻尼技术能够在振动传递路径有效降低机床结构振动,通过建立颗粒系统-龙门铣床动力学模型 ...
肖望强, 许展豪, 边贺川
core   +1 more source

Endogenous/Exogenous Dual‐Responsive Bimetallic Hollow Nanozyme for Photothermal/Nanocatalysis/Immune Synergistic Tumor Therapy

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Nanozymes have attracted considerable attention in cancer therapy due to their adjustable enzyme activity and high catalytic efficiency. However, they still face a major challenge from tumor metastasis. In this work, endogenous/exogenous dual‐responsive bimetallic hollow PdRu (termed HPdRu) nanozymes were prepared.
Nan‐Nan Zheng, Xin Hu, Jun‐Qing Hu
wiley   +1 more source

中空夹层玻璃及其支承系统的爆炸冲击响应研究

open access: yesJianzhu Gangjiegou Jinzhan, 2023
玻璃幕墙已被广泛应用于建筑结构中,但目前的设计主要针对静力荷载,对可能发生的爆炸等意外事件所产生的冲击荷载作用尚缺乏可靠研究。对爆炸冲击下的玻璃进行数值分析时,多数研究模型将边界条件过度简化,使玻璃面板直接承受爆炸冲击,忽略了支承体系中诸如框架、垫片、结构胶、滑移块等元件的缓冲作用。这种差异在中空夹层玻璃系统上更为明显,导致数值分析难以精确地模拟结构系统在冲击荷载作用下的响应。为此,对一玻璃幕墙系统进行足尺爆炸冲击试验研究,并采用LS-DYNA软件进行了精细化建模 ...
郭校宏   +4 more
doaj  

Lithology modulates soil priming effect via resource limitations and bacterial community structure

open access: yesFunctional Ecology, Volume 40, Issue 1, Page 176-190, January 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The soil priming effect (PE), triggered by root exudate inputs that stimulates microbial activity and drives significant soil carbon (C) losses in terrestrial ecosystems.
Xinyu Hou   +4 more
wiley   +1 more source

Study on Inbound Tourism Demand Based on the General-to-Specific Approach [PDF]

open access: yes, 2010
随着国际旅游业的迅速发展,入境旅游需求成为学术界研究的热点领域。本文基于1979-2008年中国4个主要客源国的数据,采用“一般到简单“建模法分析了入境旅游需求的主要影响因素及预测模型的选择。结果表明,旅游者的忠诚行为是影响入境旅游需求的最主要因素;价格和收入对不同客源国的旅游需求的影响程度不同;各种经济社会及自然因素等不可控因素都大幅度影响国际旅游需求,使中国旅游业严重受挫;旅游需求的预测应基于经济理论和统计检验结果。With the rapid development of ...
王纯阳, 黄福才
core  

Recommendations to Reinforce the Implementation of China's Updated National Key Protected Wild Plants List 关于强化实施中国新版《国家重点保护野生植物名录》的建议

open access: yesIntegrative Conservation, Volume 4, Issue 4, Page 527-533, December 2025.
The recommendations cover four key aspects namely the definition of the taxa require high priority in the biodiversity conservation management, enhanced flexibility and adaptivity of the implementation processes, enforced integration of research advancement to enable the sustainable usage of plant resources, and finally actions to propose transboundary
Shi‐Cheng Shao   +4 more
wiley   +1 more source

Q460高强钢焊接箱形压弯构件极限承载力数值分析

open access: yesJianzhu Gangjiegou Jinzhan, 2013
为了考察国产Q460高强钢焊接箱形压弯构件的力学性能,以数值积分法和有限单元法对7个已有焊接箱形压弯构件试验进行了数值分析。试件宽厚比分别为8、12、18,长细比分别为35、50、80。介绍的数值模型中考虑了实测的初始挠度、初始偏心及残余应力对构件极限承载力的影响,采用简化的残余应力分布模型、实测残余应力分布与理想弹塑性材料模型、线性强化材料模型相组合,对Q460高强钢焊接箱形压弯构件的极限承载力与荷载-挠度曲线进行了数值计算。为了验证数值分析的准确性,将预测结果与已有试验结果进行了对比,分析结果表明 ...
闫晓雷, 李国强, 陈素文
doaj  

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