Results 41 to 50 of about 20,289 (242)
Zhejiang Daxue xuebao. Lixue ban, 2013 引入Γ-函数等特殊函数，利用权函数方法和实分析技巧，建立一个核为双曲正割函数的Hilbert型积分不等式及其等价式，证明了它们的常数因子是最佳值，并通过取特殊的参数值，得到一些有意义的结果.
LIUQiong(刘琼) +1 more
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Zhejiang Daxue xuebao. Lixue ban, 2023 利用滑模控制理论及分数阶微积分2种方法，通过构造滑模函数与控制器及适应规则，研究了分数阶永磁同步电机混沌系统的自适应滑模同步问题，得到系统同步的2个充分条件，并通过数值仿真对所得结果进行了验证与分析。
毛北行(MAO Beixing) +1 more
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Variations in skin biophysical parameters with age, sex and breed in dogs
Veterinary Dermatology, EarlyView.Background – Understanding the physiological and biophysical characteristics of skin provides information for developing appropriate management strategies for skin diseases. However, in dogs, variations in skin biophysical parameters, such as age, sex and breed, remain poorly understood.
Je‐Seong Kwon +8 more
wiley +1 more source
The study of Foundation Treatment and Reinforcement Technology in Double Happiness Island [PDF]
, 2017 漳州招商局经济技术开发区的双鱼岛项目是在浅滩填筑形成的人工岛屿。项目呈圆形，半径850米，规划面积约222公顷，填海形成的陆域面积约182公顷。项目位于浅海滩涂地带，吹填的材料流动性大，地基软弱，因此地基处理是项目的关键技术问题。 论文系统地分析堆载预压处理工艺结合塑料排水板处理法和强夯法两种地基处理技术，结合双鱼岛项目的工程实际，将理论研究与工程实践相结合，深入研究并提出地基处理与加固技术设计方案与实施工艺技术。论文系统的论述了项目的设计、施工、检测的各个环节，同时结合FLAC3D软件进行数值分析 ...
徐广富
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Numerical analysis on energy-reducing and outburst-eliminating mechanism in coal mass with reaming and cavitation [PDF]
Hydraulic flushing technology had been widely used in the process of gas enhanced extraction in soft coal mass. However, few studies had revealed the energy-reducing and outburst-eliminating mechanism in hydraulic flushing coal mass from the perspective ...
Di ZHANG +8 more
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Jianzhu Gangjiegou Jinzhan, 2013 为了考察国产Q460高强钢焊接H形柱的轴心受压力学性能,对6个已有焊接H形柱的轴心受压试验进行了数值分析。数值分析采用作者编制的数值积分法电算程序和通用有限元软件ANSYS。以考虑了实测初始挠度、初始偏心及简化残余应力分布的数值模型,计算Q460高强钢焊接H形柱轴心受压的极限承载力与荷载-挠度曲线。发现数值积分法与有限单元法所计算试件的荷载-挠度曲线基本重合。为了验证数值模型的准确性,将数值分析结果与已有试验结果进行对比;并通过对比简化残余应力分布模型与实测残余应力分布对试件极限承载力、荷载 ...
王彦博 +3 more
doaj
New Phytologist, Volume 247, Issue 3, Page 1460-1473, August 2025.Summary Podocarpus pollen morphology is shaped by both phylogenetic history and the environment. We analyzed the relationship between pollen traits quantified using deep learning and environmental factors within a comparative phylogenetic framework.
Marc‐Élie Adaimé +4 more
wiley +1 more source
AStudy on Manufactur’s Dual-channel Strategy with Retailer’s Efforts [PDF]
, 2016 进入21世纪以来，电子商务的发展势头非常迅猛，不少企业都积极开设了网络销售渠道，改变了传统单一渠道供应链管理模式。制造商既可通过传统零售渠道继续销售商品，也可以通过网络直销，形成跨渠道分销模式，提升市场占有率，提高利润空间。网络直销渠道与传统零售渠道的组合运营模式，加剧了市场竞争的激烈程度，造成了制造商与零售商的纵向渠道冲突及网络直销渠道与传统零售渠道的横向渠道冲突。制造商试图消除与零售商的正面冲突，以取得双赢的成效。鉴于这些，本文引入零售商的努力行为，探讨由制造商主导的跨渠道供应链的冲突问题及协调方法，
陈秀妹
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Jianzhu Gangjiegou Jinzhan, 2021 为了研究复杂钢管空间节点的应力集中系数,采用有限元软件ANSYS建立了复杂钢管空间节点有限元模型。有限元模型考虑了焊缝的影响,将有限元计算结果与试验结果进行比较,二者吻合较好,从而验证了有限元模型的可靠性。对复杂钢管空间节点模型进行了参数分析,研究了各个参数对节点应力集中系数的影响。参数分析结果表明,主管径厚比γ对节点应力集中系数的影响较大;其他参数对节点应力集中系数的影响较小。对252个参数分析模型的结果进行回归分析,建立了节点各部分应力集中系数的拟合公式。拟合公式计算值与有限元计算值吻合较好 ...
梁佳俊 +3 more
doaj
Integrative Conservation, Volume 4, Issue 2, Page 165-187, June 2025.Upper left: Cyrtodactylus myintkyawthurai, upper right: Hemiphyllodactylus montawaensis, and bottom left: Gyiophis salweenensis, just recently described, microendemic taxa not yet covered by any protective measures. Bottom right: Geochelone platynota offspring from Cologne Zoo, an example for successful ex situ keeping and conservation breeding of ...
Carolin Scholten +7 more
wiley +1 more source