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Nonlinear dynamic analysis of functionally graded carbon nanotube-reinforced composite plates using MISQ20

《结构与土木工程前沿（英文）》页码 1072-1085 doi: 10.1007/s11709-023-0951-4

摘要： The main objective of this study is to further extend the mixed integration smoothed quadrilateral element with 20 unknowns of displacement (MISQ20) to investigate the nonlinear dynamic responses of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) plates with four types of carbon nanotube distributions. The smooth finite element method is used to enhance the accuracy of the Q4 element and avoid shear locking without using any shear correction factors. This method yields accurate results even if the element exhibits a concave quadrilateral shape and reduces the error when the element meshing is rough. Additionally, the element stiffness matrix is established by integrating the boundary of the smoothing domains. The motion equation of the FG-CNTRC plates is solved by adapting the Newmark method combined with the Newton–Raphson algorithm. Subsequently, the calculation program is coded in the MATLAB software and verified by comparing it with other published solutions. Finally, the effects of the input parameters on the nonlinear vibration of the plates are investigated.

关键词： carbon nanotube MISQ20 FG-CNTRC plate nonlinear vibration nonlinear dynamic analysis SFEM

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Rolling-element bearings in China: From ancient times to the 20th century

Lie SUN,Ang LI

《机械工程前沿（英文）》 2016年第11卷第1期页码 33-43 doi: 10.1007/s11465-016-0373-2

摘要：

The development of rolling-element bearings in China has spanned a long period. Based on several typical and important cases, the present article reconstructs the history of rolling-element bearings in China by dividing it into four stages according to the various characteristics of the bearings. The first stage represents the origin of rolling bearings in China, which remains controversial because of several suspected races and cages that were likely the components of bearings more than a millennium ago. At the second stage, a type of simple roller bearing was used for astronomical instruments not later than the 13th century based on clear philological and physical evidence. A similar bearing was also applied to an abridged armillary in the 17th century. Another type of spherical thrust bearings with rolling elements, which is a key component of a traditional Chinese windmill, could support a rotating shaft that moves rotationally and at an angle. At the third stage, the Chinese began studying and using the so-called European-style bearing since the 17th century. Moreover, over the last 100 years, the modern rolling bearing industry was gradually established in China, particularly because of the technology transfer from the Soviet Union in the 1950s. At the fourth stage, the Chinese government initiated the relatively rapid development of bearing technology. The government launched the “bearing movement” from the 1950s to the 1960s to establish the modern bearing industry and to promote rolling bearings as replacement for traditional sliding bearings. Furthermore, a number of large professional factories and institutions in China have continually introduced advanced technology and equipment. At present, these companies and institutions play a significant role in the international bearing industry.

关键词： bearing movement rolling-element bearing China early rolling bearings technology transfer

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“20世纪我国重大工程技术成就” 评选结果在京揭晓

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《中国工程科学》 2002年第4卷第1期页码 94-94

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ORGANIC CARBON STOCKS IN A SILTY TEXTURED SOIL FOLLOWING REINTEGRATION OF A 20 YEARS OLD × SITE INTO

《农业科学与工程前沿（英文）》 2023年第10卷第2期页码 183-197 doi: 10.15302/J-FASE-2023485

摘要：

● 0.98 Mg·ha⁻¹·yr⁻¹ C_org accumulation under miscanthus over 26 years.

关键词： biobased energy crops C balance humus accumulation

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Green building research from design to operation in the past 20 years: A perspective

Borong LIN, Yi WANG, Jiaping LIU, Juan YU

《结构与土木工程前沿（英文）》 2020年第14卷第5期页码 1049-1055 doi: 10.1007/s11709-020-0668-6

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大秦线开行20 kt级重载组合列车系统集成与创新

耿志修

《中国工程科学》 2008年第10卷第3期页码 31-43

摘要：技术的结合，800 MHz数据电台与Locotrol技术的结合，单套Locotrol系统与SS4机车的结合，以及2台和谐型大功率机车加可控列尾的创新方式，开发了重载配套装备，通过集成创新，使大秦线开行20

关键词：中国铁路大秦线 20 kt级重载组合列车集成创新

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Alteration of heat shock protein 20 expression in preeclamptic patients and its effect in vascular and

Fanfan Li, Mengzhou He, Meitao Yang, Yao Fan, Yun Chen, Xi Xia, Yin Xie, Dongrui Deng

《医学前沿（英文）》 2018年第12卷第5期页码 542-549 doi: 10.1007/s11684-017-0576-x

摘要：

Preeclampsia (PE) is a pregnancy-specific, multi-system disorder and the leading cause of maternal and perinatal morbidity and mortality in obstetrics worldwide. Excessive vasoconstriction and dysregulated coagulation function are closely associated with PE. Heat shock protein 20 (HSP20) is ubiquitously expressed under normal physiological conditions and has important roles in vascular dilatation and suppression of platelet aggregation. However, the role of HSP20 in the pathogenesis of PE remains unclear. In this study, we collected chorionic plate resistance arteries (CPAs) and serum from 118 healthy pregnant women and 80 women with PE and detected the levels of HSP20 and its phosphorylated form. Both HSP20 and phosphorylated HSP20 were downregulated in CPAs from women with PE. Comparison of the vasodilative ability of CPAs from the two groups showed impaired relaxation responses to acetyl choline in preeclamptic vessels. In addition to the reduced HSP20 in serum from women with PE, the platelet distribution width and mean platelet volume were also decreased, and the activated partial thromboplastin time and thromboplastin time were elevated. With regard to the vital roles of HSP20 in mediating vasorelaxation and coagulation function, the decreased HSP20 might contribute to the pathogenesis of PE.

关键词： preeclampsia heat shock protein 20 vascular relaxation coagulation-fibrinolytic system

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新型20 m桥梁检测车结构的有限元力学分析

沈意平,何福泉,王送来,张田

《中国工程科学》 2010年第12卷第9期页码 107-112

摘要：

针对设计的新型20 m桥梁检测车，利用Pro/E软件建立了4种工况下整车结构的实体模型，运用有限元软件ANSYS对建立的模型进行了静力和模态分析

关键词：桥梁检测车有限元静力模态强度

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Preclinical characterization and comparison between CD3/CD19 bispecific and novel CD3/CD19/CD20 trispecific

《医学前沿（英文）》 2022年第16卷第1期页码 139-149 doi: 10.1007/s11684-021-0835-8

摘要： The CD19-targeting bispecific T-cell engager blinatumomab has shown remarkable efficacy in patients with relapsed/refractory B-cell precursor acute lymphoblastic leukemia. However, several studies showed that blinatumomab has a short plasma half-life due to its low molecular weight, and thus its clinical use is limited. Furthermore, multiple trials have shown that approximately 30% of blinatumomab-relapsed cases are characterized by CD19 negative leukemic cells. Here, we design and characterize two novel antibodies, A-319 and A-2019. Blinatumomab and A-319 are CD3/CD19 bispecific antibodies with different molecular sizes and structures, and A-2019 is a novel CD3/CD19/CD20 trispecific antibody with an additional anti-CD20 function. Our in vitro, ex vivo, and in vivo experiments demonstrated that A-319 and A-2019 are potent antitumor agents and capable of recruiting CD3 positive T cells, enhancing T-cell function, mediating B-cell depletion, and eventually inhibiting tumor growth in Raji xenograft models. The two molecules are complementary in terms of efficacy and specificity profile. The activity of A-319 demonstrated superior to that of A-2019, whereas A-2019 has an additional capability to target CD20 in cells missing CD19, suggesting its potential function against CD19 weak or negative CD20 positive leukemic cells.

关键词： B-cell acute lymphoblastic leukemia bispecific antibody trispecific antibody CD19 CD20

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Spatial embedded reinforcement of 20-node block element for analysis PC bridges

LONG Peiheng, DU Xianting, CHEN Weizhen

《结构与土木工程前沿（英文）》 2008年第2卷第3期页码 274-280 doi: 10.1007/s11709-008-0039-1

摘要： The formula for the contribution of prestressed reinforcement on embedded reinforcement element is derived according to the mechanical behavior of PC bridges and the foundational principle of finite element method. Mechanical concept is definite and examples validate the calculation results. Reinforcement element model allows generating a finite element mesh without taking into consideration the layout of reinforcements. Furthermore, the prestressing tendon may pass through the concrete elements in an arbitrary manner. It is an effective approach that the no-node loads are diverted from the tendons to the adjacent concrete elements. A useful arithmetic analysis of the spatial curved tendon PC Bridges is provided.

关键词： arithmetic analysis calculation prestressed reinforcement mechanical arbitrary

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Synchronous rectal adenocarcinoma and anal canal adenocarcinoma

GU Jin, YAO Yunfeng, LI Jiyou, LU Aiping, WANG Hongyi

《医学前沿（英文）》 2007年第1卷第3期页码 333-337 doi: 10.1007/s11684-007-0064-9

摘要： It is difficult to distinguish a rectal carcinoma with anal metastases from coexistent synchronous anorectal carcinomas. The therapeutic strategy for rectal and anal carcinoma is so different that it should be clearly identified. Here, we report on the case of a 63-year-old man who presented with an upper-third rectal adenocarcinoma. Five months after resection, he developed an adenocarcinoma in the anal canal. The histological slides of both tumors were reviewed and immunohistochemical studies for cytokeratins (CKs) 7 and 20 were performed. The index tumor demonstrated CK 7 /CK 20+ and the second showed CK7+/CK20+. For this reason, we believe the present case had synchronous adenocarcinomas arising from anal canal and the rectum separately. It is very important to differentiate the anorectal lesions pathologically because of the impact on the therapeutic options available, especially for the lesion arising in the anal canal.

关键词： CK7+/CK20+ resection different therapeutic strategy upper-third

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工程技术百年颂

宋健

《中国工程科学》 2002年第4卷第3期页码 1-5

摘要：

回顾了20世纪世界工程科技发展的历程，论述了工程科技进步在推动全球经济和社会发展中所起的巨大作用；结合中国工程院主办的"20世纪我国重大工程技术成就"评选活动产生的25项评选结果

关键词： 20世纪工程科学技术社会进步经济发展科技人才

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Effects of irradiation on chromium’s behavior in ferritic/martensitic FeCr alloy

Xinfu HE, Wen YANG, Zhehao QU, Sheng FAN

《能源前沿（英文）》 2009年第3卷第2期页码 181-183 doi: 10.1007/s11708-009-0025-x

摘要： The effects of irradiation on chromium performance under different temperatures in Fe-20at%Cr were modeled by modified Marlowe code. Chromium precipitation was observed in FeCr alloy after irradiation; interstitial Chromium atoms are the preferred formation of mixed Fe-Cr dumbbells in the direction of<110>and<111>; interstitial chromium atoms congregated on {111} and {110} plane. The results are compared with experiment observations and are useful to understanding the irradiation performances of FeCr alloy.

关键词： irradiation Fe-20at%Cr alloy chromium segregation

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Vanadium oxide cathode with synergistic engineering of calcium-ion intercalation and polyaniline coating for high performance zinc-ion batteries

《化学科学与工程前沿（英文）》 2023年第17卷第9期页码 1244-1253 doi: 10.1007/s11705-022-2293-5

摘要： Vanadium oxides as cathode for zinc-ion batteries have attracted much attention because of their high theoretical capacity, flexible layered structure and abundant resources. However, cathodes are susceptible to the collapse of their layered structure and the dissolution of vanadium after repeated long cycles, which worsen their capacities and cycling stabilities. Herein, a synergistic engineering of calcium-ion intercalation and polyaniline coating was developed to achieve the superior electrochemical performance of vanadium pentoxide for zinc-ion batteries. The pre-intercalation of calcium-ion between vanadium pentoxide layers as pillars increase the crystal structure’s stability, while the polyaniline coating on the cathodes improves the conductivity and inhibits the dissolution of vanadium. This synergistic engineering enables that the battery system based-on the polyaniline coated calcium vanadate cathode to deliver a high capacity of 406.4 mAh·g⁻¹ at 1 A·g⁻¹, an ultralong cycle life over 6000 cycles at 10 A·g⁻¹ with 93% capacity retention and high-rate capability. The vanadium oxide cathode with synergistic engineering of calcium-ion intercalation and polyaniline coating was verified to effectively improve the electrochemical performance of zinc-ion batteries.

关键词： zinc-ion battery CaV₈O₂₀ polyaniline coating synergistic engineering high capacity long durability

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合成橡胶化学及技术进展

武冠英

《中国工程科学》 1999年第1卷第3期页码 79-85

摘要：

文章从合成橡胶的化学基础出发，叙述了合成橡胶工业二十世纪以来的过去、现状，并展望未来。着重讨论了合成化学基础及相应聚合工艺过程的进步这两方面的问题。指出合成橡胶化学基础中活性聚合、可控聚合，包括茂金属催化剂仍为近期的重点；气相聚合工艺将会得到较大的发展；高效聚合釜的研究仍是核心问题；环保问题应更受到重视。

关键词：合成橡胶合成化学活性/控制聚合气相聚合