Results 31 to 40 of about 11,690 (165)
Zonal prediction of the heights of water-conducting fracture zones under varying overburden types in North China-type coalfields [PDF]
BackgroundThe gradual increase in the exploitation depth and intensity of coal resources in the North China-type coalfields has caused problems such as overburden movement and damage, as well as fracture evolution.
Dongjing XU +6 more
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World Medical &Health Policy, Volume 17, Issue 4, Page 831-853, December 2025.ABSTRACT This article aims to sort out the meaning of the term “health nationalism,” operationalize this term and analyze this phenomenon in opposition to the cosmopolitan health policy model. Here, health nationalism is treated as a serious obstacle to access to healthcare and a cultural‐ideological barrier to equity in global public health. Two ideal
Piotr Żuk, Paweł Żuk
wiley +1 more source
Rate Adaptive LDPC Coded Communication over Underwater Acoustic Channels [PDF]
, 2016 水声信道的频带资源十分有限，在中长距离下，通常只有几kHz的带宽供水声通信使用。现有水声通信系统大多采用码率固定的信道纠错编码方法，而且为了确保在恶劣水声环境中的通信可靠性，码率一般设置得较低。显然，这种码率固定的通信方式频带利用率较低，在带宽十分有限的水声通信中是十分不利的。针对该问题，论文提出一种码率自适应的水声低密度奇偶校验（LDPC）编码通信方法，仿真和实验研究了该通信方法的性能。 论文主要研究内容如下： (1)较详细介绍了LDPC码的编码、译码和不同码率LDPC码的构造方法。构造了码率分别为0.
付强
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Mobilizing fears? How proximity to deportation threat affects political participation
Policy Studies Journal, Volume 53, Issue 4, Page 1138-1151, November 2025.Abstract Policies often provoke political changes, which are collectively known as feedback effects. Studying state variation in immigration policy, scholars have shown that proximity to hostile policy tends to mobilize Latinos. But not every member of the Latino community is likely to perceive the same proximity to anti‐immigrant policies.
Mackenzie Israel‐Trummel +2 more
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Studies of the PPDF Chemical Reaction Rate Model for the Numerical Simulation of Nitrogen Oxides [PDF]
, 2016 本文在目前应用广泛的湍流燃烧模拟方法PPDF，即预设概率密度函数的基础上，以混合分数和温度为变量，同时引入时间尺度的考虑，提出了一个NOx计算模型——PPDF化学反应速率模型。在该模型的理论基础上，使用CHEMKIN软件的SENKIN模块，以详细的化学反应机理计算NO的生成速率，并将计算结果拟合建立成数据库。 使用该模型在STAR-CD中计算了三组湍流非预混射流火焰：H2、H2/CO/N2和CH4/H2/N2射流火焰，并与Sandia实验室公布的实验数据进行比较 ...
封颖
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Predictive modeling of the development height of water-conducting fracture zones in mines in Shandong mining area [PDF]
Predicting the development height of the hydraulic fracture zone is vital to safe coal mining. This study first analyzed the development patterns of hydraulic fracture zones under similar mining conditions.
DOU Xuan, LI Ye, XIA Zhicun, XU Dongjing
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Risk, Hazards &Crisis in Public Policy, Volume 16, Issue 2, June 2025.Abstract Prior disaster experiences often provide lessons for communities to respond to new disasters. In informal communities prone to disasters but conditioned within reactive disaster management regimes, residents and Community‐Based Organizations (CBOs) play immense roles in disaster risk reduction and response.
Stephen Kofi Diko +5 more
wiley +1 more source
Jixie chuandong, 2015 <正>公司简介:哈尔滨广瀚动力传动有限公司是中国船舶重工集团公司第七○三研究所控股子公司,黑龙江省高新技术企业,公司以七○三所舰船动力传动专业为技术依托,拥有强大的设计、研发能力。公司通过长期的技术积累,掌握了高速、重载等核心动力传动技术,形成了一支高水平的研发技术团队,涵盖机、电、液等专业方向,实践经验丰富,研发模式己由传统的经验模式转变为更加严谨的理论-试验相结合模式,精通动力学分析、静力学分析、应力应变分析、流体仿真分析、
doaj +1 more source
Jianzhu Gangjiegou Jinzhan, 2012 目前,钢管混凝土结构被大量应用和推广,但其剪切及扭转性能的研究都是从有限元分析或者试验出发,得出了回归公式或者经验公式,缺少纯理论上的指导。对钢管混凝土的抗扭承载力进行了理论研究,得到了抗扭承载力的理论计算公式;然后根据钢管混凝土"统一理论"的思想,得到了抗剪极限强度以及抗剪承载力的理论计算公式;最后与若干试验数据以及已有的研究成果进行了对比,证明了理论计算公式的可行性。
谢先义, 查晓雄
doaj
Influence of ultra-close undercrossing shield on deformation of existing tunnels [PDF]
With continuous development of urban construction in recent years, many Chinese cities have successively developed and increased the construction of urban rail transit projects, and the construction of the metro engineering causes surrounding surface ...
DAI Zhengbin1, 2 , LU Yunlong1, 2
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