Results 71 to 80 of about 12,244 (133)
Zhendong Ceshi yu Zhenduan针对传统的线性超声理论在钢‑混凝土界面损伤检测中存在准确性低的问题，提出一种基于非线性超声调制理论的钢‑混凝土界面损伤识别方法。首先，在钢管混凝土内部嵌入智能骨料以激发高频超声信号，同时利用外部电磁激振器施加低频振动，从而调制出在频域上具有非线性特征的超声信号；其次，在钢管外壁的3个不同位置粘贴传感器，用于接收并记录经过界面调制的响应信号；然后，利用万能试验机开展加载试验，诱导钢‑混凝土界面产生不同程度的黏结失效，并定量分析界面裂缝扩展与损伤指标之间的变化规律；最后，通过对比分析验证该方法的有效性 ...
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Shuitu Baochi Xuebao, 2023 以明确自然界中广泛存在的层状结构土壤孔隙分布特征为目的。选黄土高原典型坝地土壤剖面为研究对象,利用CT扫描技术分析耕作层、犁底层、心土层土壤三维结构,探讨层状土孔隙参数随土层结构变化及界面层孔隙特征。结果表明:(1)瘦长型孔隙(孔隙形状系数≤0.2)是各土层土壤孔隙的主要形态。各土层的孔隙参数具有明显差异。耕作层的总孔隙度最高,大孔隙(≥1 mm)分布较多;犁底层孔隙总数量最高,含有较多孤立的小孔隙(≥0.1~0.5 mm)和微小孔隙(≥0.06~0.1 mm),但连通性最差 ...
张佐源 +5 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Advanced metallic glasses, leveraging their ultrahigh strength, excellent corrosion resistance, superior soft magnetic properties and good biocompatibility, have gradually become indispensable strategic cornerstones in critical fields such as aerospace, electronic information and energy power. This unique combination of properties enables them
Yizhou Liu +11 more
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四川大学学报. 自然科学版, 2007 采用Tortoise坐标变换,约化视界面附近Klein-Gorden方程,得到黑洞的Hawking温度.用薄膜brick-wall模型,通过选择适当的截断因子和薄层厚度,在视界面附近薄层上的熵就是黑洞的熵,结果表明黑洞熵与视界面积成正比.
杨波
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Many metallic components are frequently subjected to coupled environments of friction and vibration, stemming from interfacial contact and relative motion between mating parts or external stimuli. Consequently, it is imperative for these components to exhibit a synergy of high wear resistance and superior damping properties.
Ze Pu +12 more
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四川大学学报. 自然科学版, 1986 为了得到精确的原子或分子轨道界面图及电子云密度界面图,近年来国内已有人设计了计算等值点的电子计算机程序,利用其计算结果可以绘制出较为精确的界面图.无疑,这方面的工作,对于理论化学的研究和教学都是十分有益的.但是人工的成图过程仍然是一项麻烦的工作,而且成图质量也会因人因时而异.考虑到目前计算机绘图设备日趋完善,且成图过程将更为客观和简便.故本文为利用计算机绘图仪直接绘制分子轨道界面图及电子云密度界面图设计了一套计算机程序.
谢尧明, 田安民, 鄢国森
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT A central challenge in alkaline water electrolysis is the development of hydrogen evolution reaction (HER) electrocatalysts that simultaneously maintain high activity and structural stability at industrial current densities. Hydroxide‐based supports that facilitate water dissociation are particularly susceptible to over‐reduction and ...
Feng Chen +9 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT The development of high‐performance, self‐powered ultraviolet photodetectors (UVPDs) is crucial for the practical application of low‐power‐consumption optoelectronic devices. However, achieving both broad‐spectrum detection and high sensitivity remains a challenge.
Ping‐Xian Feng +6 more
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Ultrasound in Obstetrics &Gynecology, Volume 68, Issue 2, Page 256-269, August 2026.ABSTRACT Objectives The primary aims of this study were to validate externally the diagnostic performance of the Assessment of Different NEoplasias in the adneXa (ADNEX) model for distinguishing between malignant and benign adnexal masses, when used by non‐expert ultrasound examiners in general gynecological settings with a low prevalence of ovarian ...
I. M. Dueholm Hjorth +11 more
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四川大学学报. 自然科学版, 1979 引言自从Baiocch在研究水坝渗流的浸润面时提出了一种Baiocchi变换,一类自由边界问题的研究有了迅速的进展。最近,张恭庆,姜礼尚研究了底水油田的稳态水锥问题,得到了令人满意的结果。本文将研究另一类自由边界问题,它既是的那类自由边界问题的发展又具有本质的差异,因为在自由界面的两测速度势都决非常量(前一类问题的速度势在自由界面的某一侧是常量).
白东华, 孙顺华
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