Results 11 to 20 of about 172,129 (134)
超临界煤油的亚/超声速喷注对超声速燃烧性能的影响实验研究 [PDF]
, 2009 碳氢燃料的超声速燃烧性能与燃料射流的穿透深度密切相关。对于超临界态燃料，由于其独特的热物理特性，在一定条件下，可以加速到超声速而不发生凝结，而射流速度的增加有助于提高燃料的穿透深度。为此，本文实验研究了超声速燃料喷注的超声速燃烧性能，并与亚声速燃料喷注的实验结果进行了比较。结果表明，在相同的来流条件下，当燃料的当量比较低时，采用超声速喷注的煤油燃烧效率和亚声速喷注相差不大，但随着当量比不断提高，超声速喷注的燃料的燃烧性能可以提高10%以上。由于该方法实现起来非常简单 ...
王晶 +4 more
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, 1992 本文讨论超声速和高超声速进气道的数值模拟问题,其中包括国内外对进气道问题的一些主要进展、方向和今后预研的动态,目的在于弄清流场形成的机理 ...
王保国, 卞荫贵
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, 2002 发展高超声速技术的关键是高超声速推进技术,即“动力先行”。而超燃冲压发动机可谓是如今高超声速推进技术的代名词。在几经起落之后,伴随美国X-43的飞行实验以及美国HyTech计划的不断深入 ...
张新宇
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The Making of the Right to Food: Tracing Food Policy Conflict and Negotiated Outcomes in Colombia
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT The 2016 Peace Agreement between the Colombian Government and the FARC guerrilla group marked a historic step toward ending more than five decades of armed conflict. It also reshaped national food policy with lasting implications. During the negotiations, deep ideological divisions emerged between food sovereignty and food security, and these ...
Felipe Roa‐Clavijo
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Gongye shui chuli, 2003 超声是一种处理有机污染物废水的新型技术，近10a来，超声降解水体中有机污染物的研究十分活跃，但由于此技术存在着费用高、降解效率低等一些局限性，而更有效的方法是将超声技术与其他水处理技术联合使用．所以作者系统地介绍了超声/臭氧法、超声/紫外/臭氧法、超声/过氧化氢法、超声/Fenton试剂法、超声/光化学法、超声/电化学法、超声/磁化学法、超声/湿法氧化法、超声/生物法、超声/脱附法等联用技术在水处理中的应用研究现状，并展望了今后的重点研究方向．
郭照冰, 郑正, 袁守军, 唐登勇
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Ultrasonic Vibration Assisted Laser Processing: A Hybrid Paradigm for Extreme Surface Enhancement
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Traditional laser processing techniques offer many advantages, but they often encounter limitations such as heat‐affected zones, recast layers, residual tensile stresses, and poor surface finish. The integration of ultrasonic vibration (UV) presents a promising hybrid approach to overcome these challenges by introducing beneficial effects like
Aziz Ul Hassan Mohsan +6 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Calcium overload‐induced immunogenic cell death (ICD) holds great potential in antitumor immunotherapy, and it is a critical strategy for regulating multiple intracellular Ca2+ channels through inhibiting the endogenous Ca2+ efflux and promoting the exogenous Ca2+ influx.
Xingguo Xu +9 more
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Zhongguo cuzhong zazhi目的 探讨经食管超声心动图（transesophageal echocardiography，TEE）联合心脏声学造影在心源性卒中病因筛查中的应用价值。 方法 本研究采用前瞻性设计，连续纳入2023年3月—2025年5月就诊于首都医科大学附属北京天坛医院的疑似心源性卒中患者。纳入患者均进行常规经胸超声心动图（transthoracic echocardiography，TTE）及TEE检查。其中，合并心房颤动患者行TEE联合左心声学造影（left heart contrast enhanced-TEE，
张惠琴，杜丽娟，张萌，吕一飞，何文，张巍 ZHANG Huiqin, DU Lijuan, ZHANG Meng, LYU Yifei, HE Wen, ZHANG Wei
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Research Progress and Prospect of Single‐Atom Materials in Tumor Catalytic Therapy
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Tumor catalytic therapy (TCT), an emerging therapeutic modality, exerts specific cytotoxic effects on tumor cells by catalyzing endogenous substances within the tumor microenvironment (TME)—including hydrogen peroxide (H2O2), glucose, and glutathione—to generate reactive oxygen species (ROS) or deplete protective biomolecules.
Youyu Wang +4 more
wiley +1 more source
, 1998 论述了超声速燃烧概念，提出了对超声速燃烧的两种不同理解，论述了超声速燃烧与亚声速燃烧的不同，指出了超声速燃烧传播机制的特点和等截面超声速燃烧加热量的限制。通过超声速流动中的燃烧分析，表明定常爆燃产生的熵增和总压损失随燃烧速度的增加而减少。还论述了在欠驱动弱斜爆轰解条件下，波角不受斜劈角控制，只决定于燃烧速度 ...
袁生学
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