Results 31 to 40 of about 10,931 (117)
Zhejiang Daxue xuebao. Lixue ban, 2023 提出了一种新颖的广义无监督函数映射学习的三维形状密集对应方法。首先，基于多层感知器（multilayer perceptron，MLP）和残差网络，直接学习深度点特征。其次，计算点云的近似测地线距离，并对其进行特征分解，建立特征嵌入空间，引入注意力机制，有效学习广义基函数表示。再次，结合点特征与广义基函数生成三维形状的深度特征表示。最后，建立无监督的函数映射网络框架，获取形状之间的密集对应表示。提出的三元正则优化机制，联合重构损失、特征损失和形状匹配的距离损失 ...
窦丰(DOU Feng) +6 more
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Soft‐magnetic materials (SMMs) are indispensable for electrification and sustainable energy systems, yet their inherent mechanical fragility fundamentally limits applications under severe mechanical stresses. Enhancing the yield strength of SMMs is essential to prevent the degradation in magnetic performance and failure from plastic ...
Nairan Wang +6 more
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Social protection in fragile and conflict affected settings: The case of Sudan
International Social Security Review, Volume 79, Issue 2, Page 17-42, April/June 2026.Abstract This article examines Sudan’s state‐led social protection system by conducting a mapping of the country’s main social protection schemes, drawing on legislative documents and secondary reports as well as the 2022 Sudan Labor Market Panel Survey.
Dáire Brady, Zina Nimeh
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT As a core component in the electrochemical water splitting system, the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction (HER), while the scarcity and expenditure of current noble metal‐based electrocatalysts seriously restrict the large‐scale commercial development of hydrogen manufacturing devices. Here,
Haiyan He +8 more
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Zhongguo shiyan zhenduanxue, 2009 目的总结腰椎退行性病变的多层螺旋CT（MSCT）表现。方法300例诊断为腰椎退行性变的老年患者经MSCT扫描,分别行MPR、VRT、SSD三维重建图像,分析图像表现及不同重建方法的应用价值。结果老年腰椎退行性改变表现为椎体骨质增生、椎间盘膨出、椎间盘突出、"真空现象"、椎小关节病变、周围型的侧隐窝狭窄、退变性脊椎滑脱等。MPR可从轴位、冠状位、矢状位及任意角度的斜位重建同样高质量图像,较好地观察脊柱曲度、椎间盘病变、椎小关节、椎管内及椎间孔改变及椎体边缘性骨质增生 ...
王桂芝, 梁萍, 乔俊华, 刘纯岩
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Functional Ecology, Volume 40, Issue 3, Page 636-654, March 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang +5 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2011 目的利用mimics重建股骨的三维图像,通过模拟膝关节置换术来确定解剖轴线机械轴线来测量股骨外翻角的一种方法。方法利用吉林大学白求恩第三医院住院患者下肢CTA扫描的扫描数据（35岁男膝关节无疾病、无畸形的成年人）。通过使用mimics软件对其CT图像进行二维阈值分割及切割、数据填充等预处理,获得三维股骨模型,并在二维横断面上找到髓内定位杆的入针点,于此点向股骨近端做一直径为4 mm长度为200 mm的圆柱,通过调整圆柱的方向,找到髓内定位杆的最佳位置,可得出进针点及股骨近端该圆柱的中心的三维坐标 ...
肖建林 +7 more
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Zhejiang Daxue xuebao. Lixue ban, 2023 针对三维非牛顿流体充填问题，建立了有限元-间断有限元耦合算法。对于两相Navier-Stokes方程，基于压力增量修正格式分三步求解，分别采用二次和一次拉格朗日插值多项式求解速度和压力，以确保计算过程稳定。采用守恒型水平集（level set）方法追踪运动界面，并依据间断有限元方法求解水平集和重新初始化方程。以三维圆球剪切流动及非牛顿流体三维平板型腔充填过程为例，并与已有文献的数值和实验结果进行比较，以验证数值算法的稳定性、准确性以及流体的质量守恒性。
高普阳(GAO Puyang)
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Review of Policy Research, Volume 43, Issue 2, March 2026.ABSTRACT This study examines the paradoxical relationship between policy learning and capacity: governments need certain capacities to learn effectively, yet these same capacities often emerge from previous learning experiences. Through a comparative analysis of Hong Kong and Singapore's responses to SARS and COVID‐19, we demonstrate how policy ...
Shubham Sharma, Xun Wu, Gleb Papyshev
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2022 近年来，随着影像学技术及三维重建计算的发展，肺血管、支气管三维重建技术逐渐成熟，该技术已广泛应用于临床，获取了大量的肺血管、支气管解剖学数据，并以此为基础研究肺内血管支气管的解剖变异，可以很好的弥补大体解剖样本的局限性，进而得到更准确的解剖学数据[1-2]。本研究以肺血管、支气管的重建数据为基础，对右肺中叶的血管、支气管进行了系统的研究，描述了其中的特殊变异，为右肺中叶肺叶切除术及肺段切除术提供解剖学数据支持。1材料方法1.1收集数据及重建收集2021年1月 ...
刘冬琦 +3 more
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