Results 11 to 20 of about 1,031,420 (133)
, 1986 本文涉及燃烧室设计者感兴趣的流体力学研究课题。一些不同类型的回流区存在于燃烧室中。本文对各种回流流场进行了数值计算。 本文旨在研究非流线体火焰稳焰器周围的流场以及同向射流产生中心回流区的条件。编制了适于模拟许多燃烧室构型的通用程序。其特征之一是稳焰器侧壁的分层台阶表示法。计算采用压力-速度原始变量以及k-ε湍流模型。 计算结果表明了燃烧室设计参数的有趣的影响。可采用的实验数据与计算结果的比较 ...
赵烈
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, 1996 针对回流的运动特点，用水槽概化模型试验，验证了回流具有平均饱和挟沙力，并对回流饱和挟沙力进行了较为细致的试验研究。通过分析其基本特性，建立了回流平均饱和挟沙力的计算格式 ...
刘青泉
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, 2022 以爆轰波组织燃烧的斜爆轰发动机由于具有燃烧速率快,放热效率高的特点,在高马赫数飞行上具有广泛的应用前景。虽然斜爆轰发动机已成功完成了多次地面风洞实验,但在真正投入使用前仍有许多问题亟待解决。其中之一是燃料的混合问题。由于爆轰燃烧属于预混燃烧,且爆轰波在斜爆轰发动机燃烧室的入口建立,因此,燃料通常需要在斜爆轰发动机的进气道内喷射。进气道内的高超声速来流对燃料的充分混合提出了严峻的挑战。针对该问题,本文通过数值模拟,采用SST湍流模型,分析了来流马赫数Ma_∞=8,射流间隙比L/d_j=8,射流总压0 ...
韩桂来, 王嘉麟
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A systematic review of avian influenza virus transmission models: Gaps and opportunities
Methods in Ecology and Evolution, EarlyView.Abstract Highly pathogenic avian influenza virus (HPAIV) increasingly threatens wild birds, poultry, non‐human mammals and humans, yet gaps and opportunities in avian influenza virus (AIV) transmission modelling have not been comprehensively synthesized.
Shenglai Yin +7 more
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, 2003 本文介绍了一种可广泛应用的旋转流动汽水回收原理性实验研究,与传统的波纹板汽水回收方法相比较,旋流流动收水方法通过改变气(汽)流的上升流动为旋转上升流动,利用离心力将气流中的颗粒状水滴直接甩到器壁回收,保证湿空气基本均能够与壁面接触并且增大湿空气与壁面的接触时间,在接触旋转流动过程中使湿空气中的水蒸汽尽可能多地凝结成水滴回收。通过实验研究,旋转流动收水方法能达到比较理想的收水效果,收水效率相比较具有很大程度的提高。通过与现有波纹收水方法收水性能的比较实验,其他指标与波纹收水方法相当的情况下 ...
阚常珍, 徐永君, 鄂学全
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Conservation Biology, EarlyView.Abstract Modeling species distributions in dynamic pelagic environments remains challenging, particularly for wide‐ranging and highly mobile species when there is limited guidance on model performance. This limitation constrains the effective use of species distribution models (SDMs) in marine conservation, where robust and transferable predictions are
E. Pasanisi +32 more
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Achieving rapid and selective separation of anode and cathode materials remains a critical challenge in the recycling of spent lithium‐ion batteries. This study develops a microwave‐enhanced flotation strategy for the efficient recovery of cathode and anode materials.
Peiyuan Ye +5 more
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Ultrasound in Obstetrics &Gynecology, Volume 68, Issue 2, Page 211-219, August 2026.ABSTRACT Objectives First, to evaluate whether the ratio of soluble fms‐like tyrosine kinase‐1 to placental growth factor (sFlt‐1/PlGF) is associated with hemodynamic changes in ophthalmic artery (OA) Doppler in near‐term pregnancy. Second, to assess the performance of OA Doppler to rule in and rule out angiogenic factor imbalance.
M. F. Tinajero +7 more
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World Water Policy, Volume 12, Issue 3, August 2026.ABSTRACT Groundwater depletion is a major challenge in semiarid, hard‐rock regions where irrigation demands often exceed natural recharge. This study evaluates the effectiveness of farm‐scale recharge pits as a local, supplementary, and community‐managed groundwater recharge solution in the Dharta catchment of Rajasthan, India. Alongside check dams and
Prahlad Soni +4 more
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Recovering Critical Elements From Wastewater for Battery Materials: A Review
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Driven by global carbon neutrality goals, the transition toward a circular economy and sustainable resource management has become increasingly imperative. Given the indispensable role of battery technologies in modern energy storage systems, strategic elements such as lithium (Li), cobalt (Co), and nickel (Ni)—identified by the European ...
Ting Lei +5 more
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