Results 21 to 30 of about 10,853 (164)

The numerical investigation of non-Newtonian fluid filling process via finite element and discontinuous Galerkin method(三维非牛顿流体充填过程的有限元-间断有限元数值模拟研究)

open access: yesZhejiang 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)
doaj   +1 more source

Bottom‐Up Strategy Toward 3D Porous MXene/MoS2 Nanosheets/Graphene Nanoarchitectures as Highly‐Efficient Hydrogen Evolution Electrocatalysts

open access: yesRare 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
wiley   +1 more source

Research and Application of Robot Shell Customization and Printing Based on 3D Reconstruction Technology [PDF]

open access: yes, 2017
随着小型机器人的生产与推广,社交机器人已越来越多地被应用在家庭娱乐、商业活动以及教育领域等方面。社交机器人面向全年龄用户,能够与人进行互动和沟通,由于需要长时间与人交互,所以机器人外观的重要性显而易见。对于不同的用户而言,他们对机器人的样貌需求也不尽相同。如果能依据自身的想法对机器人外观进行定制,将会增大用户对机器人的可操作性,从而得到属于自己的个性化机器人。 本文针对社交机器人的外观,提出了一种结合三维重建技术的定制方法。三维重建技术可以提取不同照片中的相同特征点 ...
许瀚翔
core  

基于肺部增强CT三维重建的右肺中叶血管、支气管解剖结构观察

open access: yesZhongguo 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
doaj  

Climate stability drives multidimensional nestedness of amphibian assemblages in a Chinese sky island system

open access: yesFunctional 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

Current status and developing recommendations of tailings dam failure [PDF]

open access: yes, 2018
This is the final version of the article. Available from Hindawi Publishing Corporation via the DOI in this record.Tailings dam failure accidents with limited emergency response time and huge potential threats, can often lead to heavy casualties and ...
Bu, L   +4 more
core   +1 more source

基于半监督生成对抗网络的三维重建云工作室

open access: yes智能科学与技术学报, 2019
由于固有的问题复杂性和计算复杂度,三维重建是计算机视觉研究和应用领域非常重要且富有挑战性的课题。目前已有的三维重建算法往往会导致重建的三维模型上存在着明显的空洞、扭曲失真或者模糊不清的部分,而基于机器学习的三维重建算法往往又只能重建简单的分离物体,并表示成三维体元形式。所以这些算法框架对于实际应用来说都还远远不够。从 2014 年起,生成对抗网络被广泛应用于半监督学习,以及产生非真实数据集的应用中。所以本文的重点是采用生产对抗网络原理,来获得高质量的三维重建效果。提出了一种新颖的半监督三维重建算法架构 ...
余翀
doaj  

Capacity‐Learning Paradox: How Hong Kong and Singapore's Crisis Responses Shape and Are Shaped by Policy Capacities

open access: yesReview 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

三维重建技术在食管癌术前诊断的临床应用价值

open access: yesZhongguo shiyan zhenduanxue, 2019
目的三维重建功能在临床上已被广泛应用于临床的术前诊断评估,但对于食管肿瘤术前评估的应用研究甚少。本研究旨在探讨三维重建技术在食管下段肿瘤患者术前诊断中的应用,以提高食管癌的诊断和治疗水平,为患者术前评估提供一种更精准、科学的方法。方法所有患者均于2014年1月至2015年8月在吉林大学第一医院接受食管癌治疗。本研究收集患者的影像资料,应用表面重建技术重建食管肿瘤及邻近结构。分析并计算肿瘤的形状和其他具体参数,并对不同条件下的三维重建结果进行比较。研究使用IBM SPSS 19对所有数据进行分析 ...
马晓超   +4 more
doaj  

Gravity‐Driven Inclination Sensor Based on Liquid Metal Interface Migration in Anisotropic Microchannels for Information Transmission and Continuous Surface Topography Scanning

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo   +6 more
wiley   +1 more source

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