Results 21 to 30 of about 3,981,760 (167)
, 2001 升力体气动布局，由于其良好的高超声速气动特性、有效的内部空间和有益的防热特性，越来越受到气动工作者的重视，该文应用张涵信院士的NND格式思想，用数值模拟的方法对类似于美国X-33的升力体外形进行了气动力、气动热研究。特别是在粘性项的离散和表面热流率的计算中应用了散度和梯度的积分定义，避免了数值计算的奇异性，保证了通量守恒，提高了计算效率。结果表明气动热计算结果与美国同类飞行器结果接近 ...
王发民 +4 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Metal‐organic frameworks (MOFs) hold significant potential across numerous advanced disciplines due to their exceptional properties, including high specific surface area, tunable porosity, structural diversity, and customizable functionality. Increasing attention has been directed toward employing MOFs in coatings that offer both antimicrobial
Yanchun Zhao +7 more
wiley +1 more source
Structural Modulation of Magnetic Softness in Fe‐Based Amorphous Alloys via Pulse Current Training
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Fe‐based amorphous alloys, despite their intrinsically low magnetocrystalline anisotropy, suffer from quasi‐dislocation dipoles and localized stress fields that impede domain‐wall motion and increase coercivity. Here, we introduce pulse current training (PCT) as an energy‐efficient technique to overcome these limitations in a Fe76Si9B10P5 ...
Shumin Ye +13 more
wiley +1 more source
Gongye shui chuli, 2020 以地下水中NO3-为目标污染物，研究氯型季胺特种树脂（CQASR）对NO3-的吸附动力学与热力学。结果表明：离子交换过程在60 min时达到吸附平衡，吸附动力学可用准二级动力学模型较好拟合，离子交换过程主要受液膜扩散控制；吸附等温线可用Freundlich模型较好拟合，吸附热力学表明离子交换过程为自发吸热反应；离子选择性说明CQASR可作为地下水中NO3-去除专用树脂；FTIR分析发现CQASR树脂本身存在甲胺盐酸盐官能团，可能与树脂选择性去除NO3-有关。
由晗杨 +6 more
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, 2023 综述影响因素对核态沸腾中气泡动力学参数的影响，影响因素包括压力、微重力、受热面热流密度、受热面过热度与工质过冷度、受热面倾角、受热面表面粗糙度、接触角、汽化核心间距、电场、磁场、超声波等。气泡动力学参数包括气泡脱离直径(半径)、气泡脱离频率、气泡等待时间、气泡生长时间、气泡生长周期、活性成核点密度。整理气泡动力学参数的经验关联式。现有关联式考虑的影响因素有限 ...
陈浩 +4 more
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四川大学学报. 自然科学版, 2000 根据热动力学基本理论 ,建立了简单级数反应热动力学对比参量方程 ,提出了一种确定反应速率常数的方法——半寿期法 .该法只需要特征时间参量 tm 及相应的热谱数据便可方便地计算化学反应的半寿期和速率常数 .通过几个简单级数反应体系的热动力学研究 ,验证了半寿期法的正确性 .
蒋福宾, 陈勇, 陈彤, 曾宪诚
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Gongye shui chuli, 2020 采用柠檬酸、壳聚糖和Fe3O4对玉米秸秆进行改性，制备了复合材料SMC，用XRD、Zeta、BET、XPS表征秸秆改性前后结构和官能团的变化，研究pH对SMC吸附Cr（Ⅵ）效果的影响，用动力学与热力学模型拟合玉米秸秆的吸附动力学与等温吸附特征。结果表明：SMC结构疏松、孔隙增大，且具有较强的顺磁性；表面接枝羧基、氨基等基团，对铬的吸附能力提高。SMC对Cr（Ⅵ）的吸附可用准二级动力学方程描述，吸附热力学过程可用Freundlich模型描述，表明吸附过程为多分子层、吸热反应，且吸附过程中部分铬被还原。
张铁军 +5 more
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Conservation Biology, Volume 40, Issue 3, June 2026.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
Ecology and Evolution, Volume 16, Issue 5, May 2026.This study reveals a shift in woody plant community assembly from competitive exclusion in early succession to habitat filtering in later stages within karst areas. Environmental distance (80.54%) contributed significantly more than geographical distance (9.95%), providing strong quantitative evidence that niche processes, particularly habitat ...
Hongfen Hu +5 more
wiley +1 more source
, 2022 为了研究脉动热管放置方式对其传热性能的影响，以超纯水作为工质，对水平及倾角为30°放置的脉动热管的传热性能进行研究，用壁面温度振荡性能和传热热阻来描述其传热能力。在不同的放置条件下，着重分析不同加热功率和充液率(35%,50%,70%)对其传热性能的影响。研究表明：水平放置时，充液率为35%和50%时脉动热管不能启动，充液率70%时可以启动运行；脉动热管在运行时存在临界热量输入值，倾角为30°时，临界值为60 W,但水平放置条件下临界值为90 W ...
潘利生 +3 more
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