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土工袋抑制膨胀土冻胀性能试验及机制探讨

岩土力学 2024年第3期45卷 759-768,796页

作者：张勇敢鲁洋刘斯宏田金博张思钰方斌昕河海大学水利水电学院江苏南京210098

寒区膨胀土输水渠道普遍存在严重的冻胀破坏问题,严重损害工程效益。为探究不同含水率、不同干密度下土工袋抑制膨胀土冻胀性能演化规律及其物理机制,开展了土工袋制样标准率定试验和有无袋体约束下膨胀土的冻胀变形试验。试验结果表明... 详细信息

寒区膨胀土输水渠道普遍存在严重的冻胀破坏问题,严重损害工程效益。为探究不同含水率、不同干密度下土工袋抑制膨胀土冻胀性能演化规律及其物理机制,开展了土工袋制样标准率定试验和有无袋体约束下膨胀土的冻胀变形试验。试验结果表明:土工袋试样的压实高度与其干密度存在一一对应关系,可以通过控制土工袋的压实高度来精确控制土工袋的制样干密度;无论是否有袋体约束,试样的冻胀变形与时间关系曲线均可划分为冷缩、快速冻结和冻结稳定3个阶段;对于初始状态相同的膨胀土试样,袋体约束作用下其冻胀量显著减小,也即土工袋可有效地抑制膨胀土冻胀;随着含水率的增加、干密度的增大,试样的冻胀率均显著增大;土工袋的冻胀抑制率随着干密度的增加而显著增大,但含水率增加后土工袋的冻胀抑制率并未显著提升;通过分凝势理论和加筋约束原理,揭示了土工袋抑制膨胀土冻胀的内在机制;基于压汞试验获取的膨胀土孔径分布曲线,提出了袋体约束作用下冻结膨胀土的骨架结构概念模型,较好地解释了含水率和干密度对土工袋冻胀抑制率演化规律的影响差异。

关键词：膨胀土土工袋干密度含水率冻胀特性

Development of a novel difficulty scoring system for laparoscopic liver resection procedure in patients with intrahepatic duct stones

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World Journal of Gastrointestinal Surgery 2024年第10期16卷 3133-3141页

作者： bo Luo si-Kai Wu Ke Zhang Pei-Hong Wang Wei-Wei Chen Ning Fu Zhi-Ming Yang Jing-Cheng Hao Department of Hepatobiliary and Vascular Surgery The First Affiliated Hospital of Chengdu Medical CollegeChengdu 610500Sichuan ProvinceChina Department of General Surgery The Western Theater Command General HospitalChengdu 610500Sichuan ProvinceChina Department of Hepatobiliary and Pancreatic Surgery Clinical Medical College and The First Affiliated Hospital of Chengdu Medical CollegeChengdu 610500Sichuan ProvinceChina

BACKGROUND For intrahepatic duct(IHD)stones,laparoscopic liver resection(LLR)is currently a reliable ***,the current LLR difficulty scoring system(DSS)is only available for patients with hepatocellular *** To explore the development of a DSS for IHD stone patients with LLR and the validation of its *** We used clinical data from 80 patients who received LLR for IHD ***-six of these patients were used in multiple linear regression to construct a scoring *** 34 patients from different centers were used as external *** completeness of our DSS was then evaluated in patients with varying degrees of surgical difficulty based on documented surgical outcomes in the study group of *** The following five predictors were ultimately included and scored by calculating the weighted contribution of each factor to the prediction of operative time in the training cohort:Location of stones,number of stones≥3,stones located in the bile ducts of several grades,previous biliary surgery less than twice,distal bile duct ***,the data set was validated using a DSS developed from the *** following variables were identified as statistically significant in external validation:Operative time,blood loss,intraoperative transfusion,postoperative alanine aminotransferase,and Clavien-Dindo grading≥*** variables demonstrated statistically significant differences in patients with three or more *** Patients with IHD stones have varying degrees of surgical difficulty,and the newly developed DSS can be validated with external data to effectively predict risks and complications after LLR surgery.

关键词： Intrahepatic duct stones Laparoscopic liver resection Difficulty scoring system Outcome Complication

Pathogenesis and treatment of diabetes mellitus-related erectile dysfunction: current therapies and potential challenges

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Clinical Research Communications 2024年第2期7卷 11-17页

作者： Han-Yu He# Fan-Yu Meng Huan-Tian Cui Jun-Yu Luo si-Qi Ma Wei-bo Wen Jie Zhao First Clinical Medical College Yunnan University of Chinese MedicineKunming 650500China Department of Endocrinology The First Affiliated Hospital of Yunnan University of Chinese MedicineKunming 650021China.

Erectile dysfunction(ED)is one of the important complications of diabetes,which is very common in diabetic patients,affecting more than half of male patients,and the incidence of the disease is about 3.5 times that of the normal *** pathogenesis of diabetic erectile dysfunction(DMED)is complex,involving nerve,vascular,endocrine,muscular and psychological *** present,the therapeutic approaches of DMED include drug therapy,surgery,physical therapy and so *** article provides a review of current research on the pathogenesis and treatment of *** elucidation of the pathogenesis of DMED and the development of new therapeutic approaches are of great significance for the prevention and treatment of DMED.

关键词： diabetes mellitus(DM) erectile dysfunction(ED) pathogenesis therapies

Highly Transparent Fire-resistant Coatings with Intumescent Three-source Integration

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Chinese Journal of Polymer Science 2024年第7期42卷 907-915,I0005页

作者： Xiao-Liang Zeng Xin-Sheng Lan Yan Wang Lin Zhang De-Ming Guo Hai-bo Zhao State Grid sichuan Electric Power Research Institute Chengdu610041China The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(Ministry of Education) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu610064China

Wood,a readily available and sustainable natural resource,has found widespread use in construction and ***,its inherent flammability poses a potential fire *** intumescent fire-retardant coatings effectively mitigate this risk,achieving high transparency in such coatings presents a significant *** our approach,we employed a cross-linked network of phytic acid anion and N-[3-(trimethoxysilyl)propyl]-N,N,N-trimethylammonium cation to create a transparent"three-in-one"intumescent *** collaborative P/N/si flame-retardant effect markedly improved the intumescent char-forming capability,preventing the wood from rapid *** resulted in a substantial reduction in heat release(13.9%decrease in THR)and an increased limiting oxygen index(LOI)value of 35.5%.Crucially,the high transparency of the coating ensured minimal impact on the wood's appearance,allowing the natural wood grains to remain clearly *** innovative approach provides a straightforward method for developing transparent intumescent flame-retardant coatings suitable for wooden *** potential applications extend to preserving ancient buildings and heritage conservation efforts.

关键词： Fire-resistant coating Flame retardancy Wood Transparency

Biomimetic fibril-like injectable hydrogels for wound management

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Biomedical Engineering Communications 2024年第2期3卷 26-27页

作者： bo-Han Li Jin-Gai Jiang si-Wen Du Hui-Juan Cheng Yan-Ni Song Wei Shi Dong-Liang Yang Key Laboratory of Flexible Electronics and Institute of Advanced Materials School of Physical and Mathematical SciencesNanjing Tech UniversityNanjing 211816China

Soft tissue repair and regeneration present a significant clinical *** hydrogels have emerged as a promising solution for promoting stem cell differentiation and facilitating soft tissue formation[1].Various materials,including synthetic polymers like polydimethyl siloxane and natural polymers like proteins,have been be used as hydrogel matrix for hydrogel preparation[2,3].However,the limited biodegradability,inhomogeneous network structure,and inadequate mechanical properties of these hydrogels hinder their long-term application in complex environments in *** by the nanostructure of collagen fibrils,Li et *** a strategy for creating injectable nanofibrillar hydrogels by combining self-assembly and chemical crosslinking of nanoparticles[4].Moreover,injectable hydrogels offer advantages as implantable materials,including better defect filling and reduced risk of infection compared to prefabricated hydrogels[5].

关键词： hydrogel inhomogeneous crosslinking

高频方波电场-温度场作用下环氧树脂介电特性劣化协同效应

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高电压技术 2024年第9期50卷 4007-4018页

作者：司剑文韬赵毅马波黄辛毅孙绪乾合肥工业大学电气与自动化工程学院合肥230009

高频变压器环氧树脂固封绝缘系统长期承受高频方波电压应力和热应力,环氧树脂在高频方波电压应力和热应力下的绝缘性能劣化严重制约着高频变压器的运行可靠性。以往研究多在交流正弦电场与温度场作用下对环氧树脂介电特性进行分析,缺乏... 详细信息

高频变压器环氧树脂固封绝缘系统长期承受高频方波电压应力和热应力,环氧树脂在高频方波电压应力和热应力下的绝缘性能劣化严重制约着高频变压器的运行可靠性。以往研究多在交流正弦电场与温度场作用下对环氧树脂介电特性进行分析,缺乏环氧树脂在高频方波电场-温度场作用下介电特性变化的研究。搭建高频方波电压与温度联合老化实验平台,对不同老化电场强度、温度条件下环氧树脂样片进行介电特性研究,并将电热联合老化结果与单独热老化、电老化结果进行对比分析。实验结果表明,电热联合老化对环氧树脂介电特性的影响更显著,且大于电、热的叠加作用,即电热联合老化过程中存在着协同效应。通过构建环氧树脂在高频方波电压下的极化损耗计算模型,阐明了在高频方波电场作用下,由环氧树脂极化损耗引起的样片温度升高是加剧环氧树脂介电特性劣化的重要原因。该研究结果可为高频变压器绝缘状态评估提供参考。

关键词：环氧树脂方波电压介电特性极化损耗协同效应

Effect of micro-Al_(2)O_(3) powders on oxidation and corrosion behaviors of low-carbon MgO-C refractories

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Journal of Iron and Steel Research International 2024年第6期31卷 1522-1534页

作者： Yang Chen Zeng-yi Li Hao-bo Tan Yu-ran Fu Jun Ding Cheng-ji Deng Chao Yu School of Materials Science and Engineering Hunan Institute of TechnologyHengyang 421002HunanChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

To solve the problem of poor high-temperature service performance caused by low carbonization of MgO-C refractories,low-carbon MgO–C refractories with excellent thermal shock,oxidation and corrosion resistances were successfully designed by using siC whiskers as reinforcing phases and introducing micro-Al_(2)O_(3) powders as *** results indicated that the addition of micro-Al_(2)O_(3) powders optimized the internal structure of the material,like the columnar β-si_(3)N_(4) with a stepped distribution and the mosaic structure formed between granular and flaky Mg_(2)siO_(4),which synergistically strengthened and toughened the material and gave the material excellent mechanical properties and thermal shock ***,the cold modulus of rupture and cold crushing strength after thermal shock were increased by 4.1 and 20.3 MPa,***,the addition of micro-Al_(2)O_(3) powders promoted the formation of fine particles of Mg_(2)siO_(4),MgAl_(2)O_(4) and MgO,as well as a dense protective layer of Mg_(2)siO_(4) in the material under high-temperature ***,spinel and high-temperature solid solution were formed in the corrosion *** oxidation and corrosion resistances were greatly improved by 41%and 15%,respectively.

关键词： Low-carbon MgO-C refractory Oxidation resistance Corrosion resistance Thermal shock resistance Micro-Al_(2)O_(3)powder

Probing the electric double layer structure at nitrogen-doped graphite electrodes by constant-potential molecular dynamics simulations

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Journal of Energy Chemistry 2024年第6期93卷 299-305,I0008页

作者： Legeng Yu Nan Yao Yu-Chen Gao Zhong-Heng Fu bo Jiang Ruiping Li Cheng Tang Xiang Chen Tsinghua Center for Green Chemical Engineering Electrification(CCEE) Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Ordos Carbon Neutral Research and Application Co. Ltd.Ordos 017010Inner Mongoli1China Institute for Carbon Neutrality Tsinghua UniversityBeijing 100084China Center for Next-Generation Energy Materials and School of Chemical Engineering Sungkyunkwan University2066 Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea

Electric double layer(EDL)is a critical topic in electrochemistry and largely determines the working performance of lithium ***,atomic insights into the EDL structures on heteroatom-modified graphite anodes and EDL evolution with electrode potential are very ***,a constant-potential molecular dynamics(CPMD)method is proposed to probe the EDL structure under working conditions,taking N-doped graphite electrodes and carbonate electrolytes as an *** interface model was developed,incorporating the electrode potential and atom *** a result,an insightful atomic scenario for the EDL structure under varied electrode potentials has been established,which unveils the important role of doping sites in regulating both the EDL structures and the following electrochemical reactions at the atomic ***,the negatively charged N atoms repel the anions and adsorb Li~+at high and low potentials,*** preferential adsorption suggests that Ndoped graphite can promote Li~+desolvation and regulate the location of Li~+*** CPMD method not only unveils the mysterious function of N-doping from the viewpoint of EDL at the atomic level but also applies to probe the interfacial structure on other complicated electrodes.

关键词： Lithium batteries Graphite N-doping Electric double layer Molecular dynamics Constant potential method Electrode potential

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表见代理情形下“卖房骗款”行为的定性分析

司法警官职业教育研究 2024年第2期5卷 60-66页

作者：余思博安徽大学安徽合肥230601

表见代理情形下的卖房骗款行为虽具备“骗”的外观,但基于“表见代理是否影响刑事犯罪认定”这一问题的论争,司法实践中存在职务侵占罪与合同诈骗罪两种立场。消解实践冲突的关键在于:确定法秩序在违法性与法律效果层面的统一,通过民事... 详细信息

表见代理情形下的卖房骗款行为虽具备“骗”的外观,但基于“表见代理是否影响刑事犯罪认定”这一问题的论争,司法实践中存在职务侵占罪与合同诈骗罪两种立场。消解实践冲突的关键在于:确定法秩序在违法性与法律效果层面的统一,通过民事规范确定此类案件中被代理人的实质被害人地位,肯定被代理人对购房者应收房款的观念占有,锚定行为人破坏被代理人对购房者债权观念占有这一事实,以职务侵占罪或盗窃罪实现此类案件在法秩序范围内的和谐统一。

关键词：表见代理法秩序统一职务侵占罪合同诈骗罪