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Solution Blowing of Poly(dimethylsiloxane)/Nylon 6 Nanofiber Mats for Protective Applications

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Chinese Journal of Polymer Science 2014年第6期32卷 786-792页

作者： Lei Shi Xu-pin Zhuang 程博闻 Xiao-xiao Tao Wei-min kang School of Textiles Tianjin Polytechnic University Key Laboratory of Advanced Textile Composite Materials of ministry of Education Tianjin Polytechnic University

A new strategy was developed to fabricate superhydrophobic nylon 6 nanofibers, in which the blend solutions of poly（dimethylsiloxane）（PDMS） prepolymer and nylon 6 was spun using an innovative solution blowing process, and then the PDMS prepolymer contianning nanofibers were cured to obtain PDMS/nylon 6 nanofiber mats. Morphology, surface composition, non-wetting property and protective performance were investigated. The results showed that the addition of PDMS prepolymer improved the spinnability of the spinning solutions, and the PDMS/nylon 6 nanofibers had smooth surfaces and diameters from 100 nm to 350 nm. The presence of PDMS effectively enhanced the hydrophobicity of the nanofiber mats, showing water contact angles of 132° to 161° for PDMS contents of 1 wt% to 3 wt%. The PDMS/nylon 6 mats also possessed excellent protective and transport properties. The results indicated the potential application of the novel nanofiber mats in protective clothing.

关键词： Nanofiber Solution blowing Hydrophobicity Protective clothing PDMS.

Study on the Configuration of Towed Flexible Cables

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China Ocean Engineering 2003年第4期18卷 641-648页

作者： CHEN min-kang(陈敏康) ZHANG Ren-yi(张仁颐) School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University Shanghai200003 China School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University Shanghai200003 China

Based on the fundamental equation of flexible cable dynamics for a towed system, an easily solved mathematical model is set up in this paper by means of appropriate simplification. Several regular patterns of spatial motion of towed flexible cables in water are obtained through numerical simulation with the finite difference method, and then modification and verification by trial results at sea. A technical support is provided for the towing ship to maneuver properly when a flexible cable is towed. Furthermore, the relations between two towed flexible cables, which are towed simultaneously by a ship, are investigated. The results show that the ship towing two flexible cables is safe under the suggested arrangement of two winches for the towing system, and the coiling/uncoiling sequences of the cables as well as the suggested way of maneuvering.

关键词： ship maneuvering flexible cable dynamic configuration towing system

Complex Boronized Layer on the Hot-dip Aluminized Steels and Its Surface Performances

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材料热处理学报 2004年第5B期25卷 653-656页

作者： LUOXin-min LIDian-kai WANGLan CHENkang-min JiangsuUniversity ZhenjiangJiangsuP.R.China

Plain carbon steels were dipped in molten aluminum bath at 720°C ±5°C and diffused for 1, 2.5 and 6 hours respectively and then boronized at 950°C for 6 hours. The oxidation, hot-corrosion and abrasion resistance behavior were examined. The experimental results showed the compounds of the aluminized layer, from the surface to the matrix, were composed of Fe2Al5 ( n -phase ) .. Fe3Al ( -phase ) and a phase. The microstructure of aluminized plus complex boronized were similar to that simplex boronized. The XRD analysis results indicated that there existed Fe2B> Fe2AlB2and Fe2Als in this kind of layer. The simplex aluminized layers still remained bright gray appearance when oxidized at 950°C, but complex boronized layer was not able to resist oxidization at the temperature. Both the layers of complex boronized and aluminized had the same anti-oxidization level in the circulative oxidization tests, and also good anti-corrosion ability in molten salt medium. Under dry abrasive conditions, wear resistance of complex boronized layer was superior to the aluminized layer.

关键词：热镀喷铝钢硼化热腐蚀磨损

Microstructure evolution and mechanical properties of brazing joint for ultra-thin-walled Inconel 718 considering grain size effect and brazing temperature

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Chinese Journal of Aeronautics 2024年第2期37卷 541-556页

作者： Rui ZHAO Yueshuai SONG Hui kang min WAN School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Jiangxi Research Institute of Beihang University Jiangxi 330000China

The systematic investigation of the mechanical properties and microstructure evolution process of ultra-thin-walled Inconel 718 capillary brazing joints is of great significance because of the exceptionally high demands on its *** achieve this objective,this study investigates the impact of three distinct brazing temperatures and five typical grain sizes on the brazed joints’mechanical properties and microstructure evolution *** evolution analysis was conducted based on Electron Back Scatter Diffraction(EBSD),Scanning Electron Microscopy(SEM),X-Ray Diffraction(XRD),High-Resolution Transmission Electron Microscopy(HRTEM),and Focused Ion Beam(FIB).Besides,the mechanical properties and fracture behavior were studied based on the uniaxial tension tests and in-situ tension *** findings reveal that the brazing joint’s strength is higher for the fine-grain capillary than the coarse-grain one,primarily due to the formation of a dense branch structure composed of G-phase in the brazing *** effects of grain size,such as pinning and splitting,are amplified at higher brazing ***,micro-cracks initiate around brittle intermetallic compounds and propagate through the eutectic zone,leading to a cleavage fracture *** fracture stress of fine-grain specimens is higher than that of coarse-grain due to the complex micro-crack ***,this study contributes significantly to the literature by highlighting the crucial impact of grain size on the brazing properties of ultra-thin-walled Inconel 718 structures.

关键词： EYWORDS Ultra-thin-walled structure Brazing Inconel 718 Grain size effect Brazing temperature

Synthesis and Characterization of Butyl Acrylate-based Graft Polymers with Thermo-responsive Branching Sites via the Diels-Alder Reaction of Furan/Maleimide

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Chinese Journal of Polymer Science 2018年第9期36卷 1011-1018页

作者： Lin Ye Shao-Feng Zhang Yi-Chao Lin Jia-kang min LI Ma Tao Tang State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China University of the Chinese Academy of Sciences Beijing 100049 China

Thermo-responsive butyl acrylate/furfuryl methacrylate copolymer-based （PBF backbone） graft （co）polymers with dynamic covalent linkages between their backbones and side chains via the Diels-Alder reaction of furardmaleimide were synthesized. Atom transfer radical polymerization （ATRP） was used to synthesize graft copolymers with thermo-responsive transformation from graft copolymers to linear polymers with bimodal or wide MWD. The NMR measurements indicated that the Diels-Alder reaction and retro- Diels-Alder reaction occurred, depending on the change of the temperature, meaning that the side chains could be cleaved and reformed according to the variation of the temperature. GPC measurements demonstrated that the molecular weights of the polymers were thermo- responsive. Furthermore, three graft copolymers with various branching chains （PBF-g-PBA, PBF-g-P（BMA-co-MA） and PBF-g-PBMA） were compared to study the influence of compatibility between the backbone and the branching chain on the efficiency of Diels-Alder reaction after the cleavage of the DA linkage. The results showed that the ability of the side chains to come back to the main chain was strongly affected by the compatibility between the backbone and the side chains and the flexibility of the polymer chains.

关键词： Thermo-responsive Furan/maleimide ATRP Diels-Alder Acrylate

Primary squamous cell carcinoma of the liver:A case report

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World Journal of Clinical Cases 2022年第19期10卷 6744-6749页

作者： Li-min kang Di-Ping Yu Yong Zheng Ya-Hao Zhou Department of Hepatobiliary and Pancreatic Surgery Puer People's HospitalPuer 665000Yunnan ProvinceChina Department of Pathology Puer People's HospitalPuer 665000Yunnan ProvinceChina

BACKGROUND Squamous cell carcinoma(SCC)of the liver is rare,and is more commonly found in the skin,rectum,cervical or inguinal lymph *** SUMMARY A 73-year-old man had been experiencing right upper quadrant discomfort for some *** had a 50-year history of smoking and *** average,he smoked 20 cigarettes and consumed 200 *** didn’t have a history of hepatitis or ***,vomiting,jaundice,dysuria,chills,and abdominal distention were not observed at the time of *** in the right upper quadrant was found on physical examination,but there was no palpable abdominal *** obvious abnormalities in laboratory tests and tumor markers were *** plasma retention rate of indocyanine green(ICG)at 15 min was 1.35%.Subsequent abdominal ultrasonography showed a mixed echoic mass approximately 3.8 cm diameter in the left caudate lobe of the *** computed tomography confirmed a 3.0 cm×3.5 cm irregular mass with inhomogeneous density and moderate delayed enhancement in the left caudate lobe of the *** left caudate lobectomy was performed to remove the liver ***-operative findings confirmed a non-cirrhotic liver,with a 3 cm×3.5 cm white tumor mass in the left caudate lobe with no tumor rupture and no *** resection margin was 1.0 cm in *** We describe the first case of SCC in the left caudate lobe of the liver,which was successfully treated by surgical resection and postoperative *** tumor recurrence was observed during the 8-mo follow-up.

关键词： Squamous cell carcinoma Liver Left caudate lobe Immunotherapy Case report

Self-healing poly(acrylic acid) hydrogels fabricated by hydrogen bonding and Fe^(3+) ion cross-linking for cartilage tissue engineering

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Frontiers of Materials Science 2023年第3期17卷 71-82页

作者： min kang Yizhu Cheng Yinchun Hu Huixiu Ding Hui Yang Yan Wei Di Huang Research Center for Nano-Biomaterials&Regenerative Medicine Department of Biomedical EngineeringCollege of Biomedical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

Autonomous self-healing hydrogels were achieved through a dynamic combination of hydrogen bonding and ferric ion(Fe^(3+))migration.N,N′-methylenebis(acrylamide)(MBA),a cross-linking agent,was added in this ***(acrylic acid)(PAA)/Fe^(3+)and PAA–MBA/Fe^(3+)hydrogels were prepared by introducing Fe^(3+)into the PAA hydrogel *** ionic bonds were formed between Fe^(3+)ions and carboxyl *** microstructure,mechanical properties,and composition of hydrogels were characterized by field emission scanning electron microscopy and Fourier transform infrared *** experimental results showed that PAA/Fe^(3+)and PAA–MBA/Fe^(3+)hydrogels healed themselves without external *** PAA/Fe^(3+)hydrogel exhibited good mechanical properties,i.e.,the tensile strength of 50 kPa,the breaking elongation of 750%,and the self-healing efficiency of 82%.Meanwhile,the PAA–MBA/Fe^(3+)hydrogel had a tensile strength of 120 *** fabricated hydrogels are biocompatible,which may have promising applications in cartilage tissue engineering.

关键词： poly(acrylic acid) hydrogel cartilage tissue self-healing

Circulating miRNAs as biomarkers for severe acute pancreatitis associated with acute lung injury

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World Journal of Gastroenterology 2017年第41期23卷 7440-7449页

作者： Xiao-Guang Lu Xin kang Li-Bin Zhan Li-min kang Zhi-Wei Fan Li-Zhi Bai Depart-ment of Emergency Zhongshan Hospital Dalian University College of Basic Medicine Nanjing University of Chinese Medicine Department of Hepatobiliary and Pancreatic Surgery Puer People's Hospital

AIM To identify circulating micro(mi)RNAs as biological markers for prediction of severe acute pancreatitis(SAP) with acute lung injury(ALI).METHODS Twenty-four serum samples were respectively collected and classified as SAP associated with ALI and SAP without ALI, and the mi RNA expression profiles were determined by microarray analysis. These mi RNAs were validated by quantitative reverse transcriptionpolymerase chain reaction, and their putative targets were predicted by the online software Target Scan, mi Randa and Pic Tar database. Gene ontology(GO) and Kyoto encyclopedia of genes and genomes(commonly known as KEGG) were used to predict their possible functions and pathways *** We investigated 287 mi RNAs based on microarray data analysis. Twelve mi RNAs were differentially expressed in the patients with SAP with ALI and those with SAP without ALI. Hsa-mi R-1260 b, 762, 22-3 p, 23 b and 23 a were differently up-regulated and hsa-mi R-550 a*, 324-5 p, 484, 331-3 p, 140-3 p, 342-3 p and 150 were differently down-regulated in patients with SAP with ALI compared to those with SAP without ALI. In addition, 85 putative target genes of the significantly dysregulated mi RNAs were found by Target Scan, mi Randa and Pic Tar. Finally, GO and pathway network analysis showed that they were mainly enriched in signal transduction, metabolic processes, cytoplasm and cell *** This is the first study to identify 12 circulating mi RNAs in patients with SAP with ALI, which may be biomarkers for prediction of ALI after SAP.

关键词： miRNAs Severe acute pancreatitis Acute lung injury Biomarker Microarray analysis

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一种宽输入瞬态增强LDO设计

西安邮电大学学报 2024年第1期29卷 41-52页

作者：汪西虎康敏安郭仲杰杨靳郭世骁西安邮电大学电子工程学院陕西西安710121 西安理工大学自动化与信息工程学院陕西西安710048

当应用于恶劣的电子电路环境中时,汽车电子中电源管理类芯片可能发生瞬态高压和线路的动态变化。为了拓宽输入范围和改善瞬态响应性能,提出了一种宽输入瞬态增强低压差线性稳压器(Low Dropout Regulator, LDO)设计。采用预稳压电路将输... 详细信息

当应用于恶劣的电子电路环境中时,汽车电子中电源管理类芯片可能发生瞬态高压和线路的动态变化。为了拓宽输入范围和改善瞬态响应性能,提出了一种宽输入瞬态增强低压差线性稳压器(Low Dropout Regulator, LDO)设计。采用预稳压电路将输入高电压转化为低压电源,为电路内部模块供电来实现宽输入。主环路使用双调整管设计方式,通过添加快速响应通路的方式加快环路对输出电压变化的响应速度,结合快速放电电路以实现快速瞬态响应。应用米勒调零补偿和零点补偿方法以保证不同带载条件下环路的稳定性。仿真结果表明,设计LDO电路输入电压的范围为3~40 V,预稳压电路可以将输入的高电压降压至2.8 V;LDO输出电压典型值为5 V,最大可带载150 mA;当负载电流发生150 mA的跳变时,输出的上冲电压和下冲电压分别为40.32 mV和55.77 mV。与已有的相关设计相比,所提设计实现了较宽的输入范围,同时具有较好的瞬态响应性能。

关键词：低压差线性稳压器汽车电子宽输入范围快速瞬态响应米勒调零补偿零点补偿