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硅烷型防银胶扩散剂的制备及其性能

材料保护 2018年第4期51卷 80-83页

作者：刘月丁运虎陶明毛祖国黄兴林王柱元黄朝志武汉材料保护研究所湖北武汉430030

为抑制引线框架镀银层后续封装时导电银胶的渗出扩散问题,以硅烷偶联剂KH-550为主成膜剂,研制了一种硅烷型防银胶扩散剂,以其对银镀层进行处理,在镀银层表面制备了一层硅烷膜。采用接触角测试仪测试了镀银层经防银胶扩散剂处理前后的接... 详细信息

为抑制引线框架镀银层后续封装时导电银胶的渗出扩散问题,以硅烷偶联剂KH-550为主成膜剂,研制了一种硅烷型防银胶扩散剂,以其对银镀层进行处理,在镀银层表面制备了一层硅烷膜。采用接触角测试仪测试了镀银层经防银胶扩散剂处理前后的接触角,并通过金相显微镜观察了硅烷膜抑制导电银胶扩散的效果。结果表明:经过硅烷型防银胶扩散剂处理后,镀银层的接触角由40°~50°提高到70°~80°,试片疏水性增强;经防银胶扩散剂处理后的镀银层表面导电银胶扩散面积比例由19.53%减小到3.79%,扩散量减少,防银胶扩散处理有效地抑制了导电银胶的扩散。

关键词：硅烷化导电银胶防银胶扩散剂渗出

Physical model test on the support characteristic for quasi-NPR bolt under asymmetric stress

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Underground Space 2023年第4期11卷 46-62页

作者： Wei ming Xiaojie Yang Yadong mao Xiang Wang Manchao He Zhigang tao State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

With the continuous increase in tunnel construction,the significant deformation of the surrounding tunnel rock is often difficult to predict and *** addition,the lithology,structure,and various asymmetric large deformation of surrounding rock mass during operation and maintenance severely affect the ultimate bearing and stability of the *** explore the deformation mechanisms and failure modes of surrounding rock under large asymmetric stress and complex geological conditions,a physical model of a tunnel through granite was constructed based on the similarity *** model had 30°dip lithology under asymmetric stress and was emplaced a new quasi-negative Poisson’s ratio(NPR)*** analyzing the variation law of displacement and axial force of the bolt under an asymmetric load,the asymmetric deformation and failure mechanism of the granite tunnel and the support effect of the quasi-NPR bolt were *** energy absorbed by the surrounding rock was analyzed,and the influence mechanism and control countermeasures of asymmetric stress on the granite tunnel were *** work provides a reference for the design of asymmetric support of tunnels with similar engineering backgrounds.

关键词： Asymmetric stress Physical model test Quasi-NPR bolt Support characteristic

Regional characteristic of 7YSZ coatings prepared by plasma spray-physical vapor deposition technique

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Rare Metals 2021年第11期40卷 3308-3315页

作者： Zi-Qian Deng Jie mao Min Liu Chun-ming Deng Jing-tao Ma School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China Guangdong Institute of New Materials National Engineering Laboratory for Modern Materials Surface Engineering Technology and The Key Lab of Guangdong for Modern Surface Engineering TechnologyGuangzhou 510651China School of Materials Science and Engineering Central South UniversityChangsha 410083China

7 YSZ coating was prepared by plasma sprayphysical vapor deposition(PS-PVD) technique based on a specific experimental *** microstructure and deposition properties of 7 YSZ coating along the radius of plasma jet were investigated in *** show that the coating presents regional characteristic in the radial direction,which could be divided into three typical zones:In Zone Ⅰ,the coating is all composed of columnar structures with cauliflower structure,and the coating properties including the surface roughness and deposition efficiency(DE) are almost stable;in Zone Ⅲ,the coating is made up of solid particles,droplet and gas phase mixed without columnar structures;Zone Ⅱ is between Zone Ⅰ and ZoneⅢ, in which there are columns with domed top and small *** on experiment results,a model on the state and distribution of particles in plasma jet was proposed to clarify the regional *** study is helpful to comprehend and control coatings deposition by PS-PVD technique.

关键词： Plasma spray-physical vapor deposition 7YSZ coating Particles distributing Regional characteristic

A novel method for simulating nuclear explosion with chemical explosion to form an approximate plane wave: Field test and numerical simulation

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2137-2153页

作者： Wei ming Xiaojie Yang Yadong mao Xiang Wang Manchao He Zhigang tao College of Civil and Architecture Engineering North China University of Science and TechnologyTangshan063210China State Key Laboratory for Tunnel Engineering China University of Mining and Technology-BeijingBeijing100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing100083China

A nuclear explosion in the rock mass medium can produce strong shock waves,seismic shocks,and other destructive effects,which can cause extreme damage to the underground protection *** the increase in nuclear explosion power,underground protection engineering enabled by explosion-proof impact theory and technology ushered in a new *** paper proposes to simulate nuclear explosion tests with on-site chemical explosion tests in the form of multi-hole ***,the mechanism of using multi-hole simultaneous blasting to simulate a nuclear explosion to generate approximate plane waves was *** plane pressure curve at the vault of the underground protective tunnel under the action of the multi-hole simultaneous blasting was then obtained using the impact test in the rock mass at the *** to the peak pressure at the vault plane,it was divided into three regions:the stress superposition region,the superposition region after surface reflection,and the approximate plane stress wave zone.A numerical simulation approach was developed using PFC and FLAC to study the peak particle velocity in the surrounding rock of the underground protective cave under the action of multi-hole *** time-history curves of pressure and peak pressure partition obtained by the on-site multi-hole simultaneous blasting test and numerical simulation were compared and analyzed,to verify the correctness and rationality of the formation of an approximate plane wave in the simulated nuclear *** comparison and analysis also provided a theoretical foundation and some research ideas for the ensuing study on the impact of a nuclear explosion.

关键词： Approximate plane wave Multi-hole simultaneous blasting Chemical explosion Nuclear explosion Pressure sensor inclusion

Statistical Properties of a Blazar Sample and Comparison of HBLs, LBLs and FSRQs

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Chinese Journal of Astronomy and Astrophysics 2005年第5期5卷 471-486页

作者： Li-Sheng mao Guang-Zhong Xie Jin-ming Bai Hong-tao Liu Yunnan Observatory National Astronomical Observatories Chinese Academy of SciencesKunming 650011 Graduate University of Chinese Academy of Sciences Beijing 100049 Yunnan Astrophysics Center Yunnan University Kunming 650091

Making use of the 2MASS Data Release, we have searched for nearinfrared （JHK） counterparts to 268 blazars from Donato et al. and obtained 238 counterparts within 5＇＇ in the area covered by 2MASS. It provides us a sample with infrared data several times larger than the previous one of the same kind. Based on our sample and the sample by Donato et al., we have compared in detail the properties of HBLs, LBLs and FSRQs from five aspects and found that HBLs are significantly different from LBLs and FSRQs while LBLs are not obviously different from FSRQs. Our results strongly support the division of BL Lac objects into the high-frequency peaked （HBL） and low-frequency peaked （LBL） objects introduced by Padovani ＆ Giommi and show that HBLs and LBLs are two kinds of blazar having different physical properties.

关键词： BL Lacertae objects: general-infrared: galaxies - methods: statistical

Primary myelofibrosis with thrombophilia as first symptom combined with thalassemia and Gilbert syndrome:A case report

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World Journal of Clinical Cases 2022年第13期10卷 4161-4170页

作者： Guzailinuer Wufuer Kaisaer Wufuer Tu Ba tao Cui Ling tao Ling Fu ming mao ming-Hui Duan Department of Hematology People's Hospital of Xinjiang Uygur Autonomous RegionUrumqi 830001Xinjiang Uygur Autonomous RegionChina Department of Thoracic Surgery The Eighth Affiliated Hospital of Xinjiang Medical UniversityUrumqi 830001Xinjiang Uygur Autonomous RegionChina Department of Pathology People's Hospital of Xinjiang Uygur Autonomous RegionUrumqi 830001Xinjiang Uygur Autonomous RegionChina Department of Radiology People's Hospital of Xinjiang Uygur Autonomous RegionUrumqi 830001Xinjiang Uygur Autonomous RegionChina Department of Hematology Peking Union Medical College HospitalBeijing 100730China

BACKGROUND A 46-year-old Han man first had sigmoid sinus and transverse sinus venous thrombosis at the age of *** the age of 44,he once again developed *** testing showed heterozygous SERPINC1 mutation,bone marrow biopsy showed fibrosis grade 1(MF-1),and JAK2 V617F mutation was positive,accompanied by UGT1A1 mutation andβ-thalassemia gene *** SUMMARY A 46-year-old Han man was first found to have sigmoid sinus and transverse sinus venous thrombosis at the age of 42 but had no individual or family thrombosis history,and he had been regularly taking warfarin anticoagulant therapy for a long period of *** the age of 44,venous thrombosis reappeared in parts of the intrahepatic vein,main portal vein,splenic vein,and superior mesenteric vein,and his spleen was obviously *** had a history of jaundice for many years,and genetic testing revealed that he carried a heterozygous SERPINC1 *** marrow biopsy showed multifocal fibrous tissue hyperplasia among trabeculae and focal *** was positive for the JAK2 V617F *** the same time,UGT1A1 andβ-thalassemia gene mutations existed,and a SERPINC1 mutation and UGT1A1 mutation were both found in his *** The patient in this case had thrombophilia as the primary symptom,JAK2V617-positive myeloproliferative neoplasm(MPN)was the main potential cause,and hereditary AT-III deficiency may have been one of multiple secondary *** remains to be determined whether UGT1A1 andβ-thalassemia gene mutations are related to ***,the clinical features of MPN in this patient were hidden,and the relevant clinical features of coexisting thalassemia and hereditary Gilbert syndrome,reported here for the first time domestically and abroad,were complicating factors,causing great difficulties for a clear ***,when thrombophilia has been determined,it is necessary to screen the relevant latent problems *** the clinical features cannot be perfect

关键词： Thrombophilia Prefibrotic myelofibrosis Negative family thrombosis history Case report

Application of material-mesh algebraic collapsing acceleration technique in method of characteristics——based neutron transport code

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Nuclear Science and Techniques 2021年第8期32卷 95-109页

作者： ming Dai mao-Song Cheng Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China CAS Innovative Academies in TMSR Energy System Chinese Academy of SciencesShanghai 201800China

The algebraic collapsing acceleration(ACA)technique maximizes the use of geometric flexibility of the method of characteristics(MOC).The spatial grids for loworder ACA are the same as the high-order transport,which makes the numerical solution of ACA equations costly,especially for large-size *** speed-up the MOC transport iterations effectively for general geometry,a coarse-mesh ACA method that involves selectively merging fine-mesh cells with identical materials,called material-mesh ACA(MMACA),is *** energy group batching(EGB)strategy in the tracing process is proposed to increase the parallel efficiency for microscopic crosssection *** and macroscopic crosssection benchmark problems are used to validate and analyse the accuracy and efficiency of the MMACA *** maximum errors in the multiplication factor and pin power distributions are from the VERA-4 B-2 D case with silver-indium-cadmium(AIC)control rods inserted and are 104 pcm and 1.97%,*** with the single-thread ACA solution,the maximum speed-up ratio reached 25 on 12 CPU cores for microscopic cross-section VERA-4-2 D *** the C5 G7-2 D and LRA-2 D benchmarks,the MMACA method can reduce the computation time by approximately one *** present work proposes the MMACA method and demonstrates its ability to effectively accelerate MOC transport iterations.

关键词： Algebraic collapsing acceleration Material-mesh ACA Method of characteristics OpenMP Arbitrary geometry

Heat Storage Performance of PCM in a Novel Vertical Pointer-Shaped Finned Latent Heat Tank

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Journal of Thermal Science 2024年第2期33卷 422-434页

作者： mao Qianjun ZHU Yuanyuan LI tao School of Urban Construction Wuhan University of Science and TechnologyWuhan430065China

The heat storage performance of latent heat storage systems is not good due to the poor thermal conductivity of phase change *** this paper,a new type of pointer-shaped fins combining rectangular and triangular fins has been employed to numerically simulate the melting process in the heat storage tank,and the fin geometry parameter effects on heat storage performance have been *** results indicate that compared with the bare tube and the rectangular finned tank,the melting time of the phase change material in the pointer-shaped finned tank is reduced by 64.2%and 15.1%,*** closer the tip of the triangular fin is to the hot wall,the better the heat transfer *** optimal height of the triangular fin is about 8 *** the number of fins from 4 to 6 and from 6 to 8 reduces the melting time by 16.0%and 16.7%***,increasing the number of fins from 8 to 10 only reduces the melting time by 8.4%.When the fin dimensionless length is increased from 0.3 to 0.5 and from 0.5 to 0.7,the melting time is shortened by 17.5%and 13.0%.But the melting time is only reduced by 2.9%when the dimensionless fin length is increased from 0.7 to *** optimising the design of the thermal storage system,the results can provide a reference value.

关键词： thermal energy storage phase change material pointer-shaped fins heat storage performance

Comparative investigation on the heat transfer performance of an energy storage system with a spiral tube and straight tube:An experimental approach

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Science China(Technological Sciences) 2023年第1期66卷 71-85页

作者： mao QianJun CAO Yan LI tao School of Urban Construction Wuhan University of Science and TechnologyWuhan 430065China

Latent heat thermal energy storage systems can effectively fill the gap between energy storage and application, and phase-change materials(PCMs) are crucial media for storing thermal energy. Therefore, how to maximize the utilization efficiency of PCMs has attracted widespread attention. In this study, the thermal behavior of two thermal storage units employing a spiral tube and straight tube as heat transfer tubes was experimentally researched and comprehensively compared. Stefan numbers were used to investigate the impact of the heat transfer fluid temperature on the PCM melting process. The temperature distribution of PCMs,temporal evolution of the melting front, and temperature variations of measurement points in both tanks were compared. The average temperature and energy storage of PCMs were calculated to evaluate the thermal performance of different configurations. The results indicate that compared to cylinder B(with a straight tube), the energy storage in cylinder A(with a spiral tube)increased by 78.8%, 38.5%, and 19.6% at Stefan numbers of 1.08, 1.28, and 1.48, respectively. Moreover, the increase in the Stefan number simultaneously ascended the average temperature and energy storage of PCMs in containers A and B, causing the shortening of the melting time. When the Stefan number was increased from 1.28 to 1.48, the storage capacity was raised from3233.18 to 3463.8 k J, and the total melting time was decreased by 34.2% from 547.5 to 360 min after the PCM was loaded in cylinder A. The research results lay a certain foundation for a deeper study of enhanced heat transfer in spiral tubes.

关键词： thermal energy storage visualization experiment PCM spiral tube straight tube