检索结果-南通市图书馆

Electric field and force characteristic of dust aerosol particles on the surface of high-voltage transmission line

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第1期33卷 368-378页

作者：刘滢格李兴财王娟马鑫孙文海 School of Physics Ningxia UniversityYinchuan 750021China Xinhua College of Ningxia University Yinchuan 750021China School of Electronic-Electrical Engineering Ningxia UniversityYinchuan 750021China

High-voltage transmission lines play a crucial role in facilitating the utilization of renewable energy in regions prone to desertification. The accumulation of atmospheric particles on the surface of these lines can significantly impact corona discharge and wind-induced conductor displacement. Accurately quantifying the force exerted by particles adhering to conductor surfaces is essential for evaluating fouling conditions and making informed decisions. Therefore, this study investigates the changes in electric field intensity along branched conductors caused by various fouling layers and their resulting influence on the adhesion of dust particles. The findings indicate that as individual particle size increases, the field strength at the top of the particle gradually decreases and eventually stabilizes at approximately 49.22 k V/cm, which corresponds to a field strength approximately 1.96 times higher than that of an unpolluted transmission line. Furthermore,when particle spacing exceeds 15 times the particle size, the field strength around the transmission line gradually decreases and approaches the level observed on non-adhering surface. The electric field remains relatively stable. In a triangular arrangement of three particles, the maximum field strength at the tip of the fouling layer is approximately 1.44 times higher than that of double particles and 1.5 times higher compared to single particles. These results suggest that particles adhering to the transmission line have a greater affinity for adsorbing charged particles. Additionally, relevant numerical calculations demonstrate that in dry environments, the primary adhesion forces between particles and transmission lines follow an order of electrostatic force and van der Waals force. Specifically, at the minimum field strength, these forces are approximately74.73 times and 19.43 times stronger than the gravitational force acting on the particles.

关键词： high-voltage current electric field aerosol particles force characteristic

Differences in dry sliding wear behavior between HVAF-sprayed amorphous steel and crystalline stainless steel coatings

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第5期35卷 865-874页

作者： Hui Guo Suode Zhang wenhai sun Jianqiang Wang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China University of Chinese Academy of Sciences Beijing 100049 China

Dry sliding wear behavior of amorphous steel coating(ASC) and crystalline stainless steel coating(SSC)manufactured by high-velocity-air-fuel-spraying was investigated. With increasing normal load, coefficient of friction(COF) of ASC decreases slightly from 0.78 to 0.69. COF of SSC presents a minor difference under various normal loads but increases with sliding time accompanied by relatively large *** a difference in friction behavior between such two coatings can be understood based upon the roles of shear stress and flash temperature. Wear rate of SSC is much higher than that of ASC, suggesting better wear resistance of ASC. The enhanced wear resistance is correlated with high hardness(H), reduced Young’s modulus(E_r), and ratios of H/Erand H^3/Er^2. Detailed analyses on worn surfaces and sub-surfaces indicate that the wear mechanisms for ASC include delamination, abrasive and oxidation wear, whereas those for SSC are delamination and oxidation.

关键词： Amorphous steel coating Nanoindentation Shear stress Flash temperature Wear mechanism

Impact of gas pressure on particle feature in Fe-based amorphous alloy powders via gas atomization:Simulation and experiment

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第10期105卷 203-213页

作者： Yutong Shi Weiyan Lu wenhai sun Suode Zhang Baijun Yang Jianqiang Wang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Gas atomization is now an important production technique for Fe-based amorphous alloy powders used in additive manufacturing,particularly selective laser melting,fabricating large-sized Fe-based bulk metallic *** the realizable k-εmodel and discrete phase model theory,the flow dynamics of the gas phase and gas-melt two-phase flow felds in the close-wake condition were investigated to establish the correlation between high gas pressure and powder particle *** locations of the recirculation zones and the shapes of Mach disks were analyzed in detail for the type of discrete-jet closed-coupled gas atomization *** the gas-phase flow feld,the vortexes,closed to the Mach disk,are found to be a new deceleration *** the two-phase flow feld,the shape of Mach disk changes from“S”-shape to“Z”-shape under the impact of the droplet *** predicted by the wave model,with the elevation of gas pressure,the size of the particle is found to gradually decrease and its distribution becomes more *** results were compliant with the Fe-based amorphous alloy powder preparation *** study deepens the understanding of the gas pressure impacting particle features via gas atomization,and contributes to technological applications.

关键词： Gas atomization Fe-based amorphous powder Closed-wake Gas-melt flow Break-up Particle size distribution

Nicotine alpha 4 beta 2 receptor-mediated free calcium in an animal model of facial nucleus injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2010年第19期5卷 1500-1504页

作者： Dawei sun wenhai sun Yanqing Wang Fugao Zhu Rui Zhou Yanjun Wang Banghua Liu Xiuming Wan Huamin Liu Department of Otolaryngology Head and Neck Surgery Affiliated Hospital of Qingdao University Medical College Qingdao 266003 Shandong Province China Department of Science and Education Affiliated Hospital of Qingdao University Medical College Qingdao 266003 Shandong Province China School of Public Health Shandong University Jinan 250012 Shandong Province China Department of Otolaryngology Head and Neck Surgery Union Hospital Huazhong University of Science and Technology Wuhan 430022 Hubei Province China Department of Oncology Affiliated Hospital of Qingdao University Medical College Qingdao 266003 Shandong Province China

Previous studies have demonstrated that the cholinergic system, via nicotinic receptors, regulates intracellular free calcium levels in the facial nucleus under normal physiological conditions. However, the regulation of nicotinic receptors on free calcium levels following facial nerve injury remains unclear. In the present study, an animal model of facial nerve injury was established, and changes in nicotinic receptor expression following facial nerve injury in rats were detected using reverse transcription polymerase chain reaction. Nicotinic receptor-mediated changes of free calcium levels following facial nucleus injury were determined by laser confocal microscopy. Results showed no significant difference in nicotinic receptor expression between the normal group and the affected facial nerve nucleus. The nicotinic receptor a4132 subtype increased free calcium levels following facial nerve injury by promoting calcium transmembrane influx, and L-type voltage-gated calcium channel-mediated influx of calcium ions played an important role in promoting calcium transmembrane influx. The nicotinic receptor-mediated increase of free calcium levels following facial nerve injury provides an important mechanism for the repair of facial nerve injury.

关键词： facial nerve injury nicotinic receptor choline calcium peripheral nerve injury

在线全文

学校读者我要写书评

暂无评论

公共云存储服务数据安全及隐私保护技术综述

计算机研究与发展 2014年第7期51卷 1397-1409页

作者：李晖孙文海李凤华王博洋综合业务网络理论与关键技术国家重点实验室(西安电子科技大学) 西安710071 中国科学院信息工程研究所北京100093

随着云计算技术的日益普及,公共云存储服务已经得到普遍的应用,DropBox、Google Drive、金山快盘等公共云存储应用的用户飞速增长.然而,用户对他们保存在云端数据的隐私性、完整性以及可控分享的关切也日益增长.针对这一问题,近年来学... 详细信息

随着云计算技术的日益普及,公共云存储服务已经得到普遍的应用,DropBox、Google Drive、金山快盘等公共云存储应用的用户飞速增长.然而,用户对他们保存在云端数据的隐私性、完整性以及可控分享的关切也日益增长.针对这一问题,近年来学术界对公共云存储服务中数据的细粒度访问控制、密文搜索、数据完整性审计以及云存储数据的安全销毁等问题展开了大量研究.对云存储数据安全和隐私保护技术方向的研究进展进行综述,并指出待解决的关键问题.

关键词：云存储属性基加密密文搜索数据完整性审计安全数据销毁

在线全文

学校读者我要写书评

暂无评论

原发性颈淋巴结结核的临床特征与治疗

临床耳鼻咽喉科杂志 2006年第12期20卷 552-553页

作者：孙文海刘华敏梁大鹏青岛大学医学院附属医院耳鼻咽喉科山东青岛266003 青岛大学医学院附属医院肿瘤科山东青岛266003

目的:探讨原发性颈部淋巴结结核的临床特征和治疗方法。方法:回顾性分析32例原发性颈部淋巴结结核患者的临床资料。32例患者中29例活检前行CT检查,4例行细针穿刺针吸活检确诊,28例行手术病理检查确诊。27例行肿块全部切除或区域性颈部... 详细信息

目的:探讨原发性颈部淋巴结结核的临床特征和治疗方法。方法:回顾性分析32例原发性颈部淋巴结结核患者的临床资料。32例患者中29例活检前行CT检查,4例行细针穿刺针吸活检确诊,28例行手术病理检查确诊。27例行肿块全部切除或区域性颈部淋巴结清扫术,术后全身抗结核治疗6个月;5例确诊后行常规抗结核治疗1年。结果:CT显示肿块呈均匀或不均匀强化,部分肿块呈融合现象。全部病例治疗后均行随访,手术患者术后切口均Ⅰ期愈合,1例术后抗结核治疗3个月肿块增大,再次手术确诊为颈部淋巴结结核并发鼻咽癌颈部淋巴结转移,转肿瘤科治疗,其余31例患者均无颈部淋巴结结核复发和其他结核病表现。结论:原发性颈部淋巴结结核临床特征发生改变,颈部肿块为首发症状,多数位于颈后三角区。CT检查有助于本病的诊断和鉴别诊断。全身抗结核药物和手术切除淋巴结的联合应用能有效地治疗原发性颈部淋巴结结核。原发性颈部淋巴结结核的治疗应以手术为主,手术治疗能缩短治疗时间、减少药物用量及不良反应,防止冷脓肿及窦道形成。

关键词：结核,淋巴结颈部外科手术

SKP2及MRP-1/CD9在声门癌及癌旁组织中的表达及其临床意义

在线全文

学校读者我要写书评

暂无评论

临床耳鼻咽喉头颈外科杂志 2010年第4期24卷 158-160,165页

作者：王艳孙彦孙文海陈志俊安丰苗青岛大学附属医院耳鼻咽喉科山东青岛266003

目的:观察声门癌及癌旁组织中SKP2及MRP-1/CD9蛋白的变化意义及其对声门癌手术安全切除范围的指导意义。方法:用免疫组织化学SP法检测38例声门鳞状细胞癌组织及距癌组织边缘2、5、10mm的组织中SKP2及MRP-1/CD9蛋白的表达,并取10例声带... 详细信息

目的:观察声门癌及癌旁组织中SKP2及MRP-1/CD9蛋白的变化意义及其对声门癌手术安全切除范围的指导意义。方法:用免疫组织化学SP法检测38例声门鳞状细胞癌组织及距癌组织边缘2、5、10mm的组织中SKP2及MRP-1/CD9蛋白的表达,并取10例声带息肉组织作对照。结果:SKP2蛋白产物异常表达按息肉黏膜组织、癌旁组织(2、5、10mm)及癌组织的顺序依次递减,差异有统计学意义(均P<0.05);MRP-1/CD9蛋白产物异常表达按息肉黏膜组织、癌旁组织(2、5、10mm)及癌组织的顺序依次递增,差异有统计学意义(均P<0.05)。结论:SKP2及MRP-1/CD9均可作为判断喉癌生物学特性的参考指标,声门癌手术安全切缘以距肿瘤≥5mm的标准较为适宜。

关键词：声门肿瘤 SKP2 MRP-1/CD9 免疫组织化学安全切缘

会厌和胸骨舌骨肌在T3级声门癌喉功能保全手术中的应用

在线全文

学校读者我要写书评

暂无评论

中国耳鼻咽喉头颈外科 2005年第9期12卷 557-559页

作者：孙彦陈志俊孙文海蒋光峰孙炜青岛大学医学院附属医院耳鼻咽喉头颈外科山东青岛266003

目的探讨会厌和胸骨舌骨肌肌筋膜瓣联合应用在保全喉功能的T3级声门癌手术中的应用价值。方法对36例T3级声门癌患者行喉扩大垂直部分切除术,喉部缺损采用会厌瓣和胸骨舌骨肌肌筋膜瓣联合重建。结果所有患者均恢复发音和呼吸功能,拔管率9... 详细信息

目的探讨会厌和胸骨舌骨肌肌筋膜瓣联合应用在保全喉功能的T3级声门癌手术中的应用价值。方法对36例T3级声门癌患者行喉扩大垂直部分切除术,喉部缺损采用会厌瓣和胸骨舌骨肌肌筋膜瓣联合重建。结果所有患者均恢复发音和呼吸功能,拔管率94.4%,3年生存率和5年生存率分别为84.0%和69.2%。结论在保全喉功能T3级声门癌手术中,联合应用会厌瓣和胸骨舌骨肌肌筋膜瓣重建喉腔有助于喉功能恢复。

关键词：喉肿瘤会厌修复外科手术喉切除术胸骨舌骨肌肌筋膜瓣喉功能恢复声门癌会厌瓣手术中 T3

应用牵张延长法矫正单侧D型短指症的短甲畸形

在线全文

学校读者我要写书评

暂无评论

中华整形外科杂志 2023年第2期39卷 199-204页

作者：蒋永康黄磊王斌孙文海上海交通大学医学院附属第九人民医院整复外科上海200011

目的观察牵张延长法矫正D型短指症短甲畸形的效果。方法回顾性分析2020年1月至2021年12月上海交通大学医学院附属第九人民医院整复外科采用牵张延长法治疗单侧D型短指症患者资料。术中于拇指末节骨干中段横向截骨,截骨线两侧各插入1枚螺... 详细信息

目的观察牵张延长法矫正D型短指症短甲畸形的效果。方法回顾性分析2020年1月至2021年12月上海交通大学医学院附属第九人民医院整复外科采用牵张延长法治疗单侧D型短指症患者资料。术中于拇指末节骨干中段横向截骨,截骨线两侧各插入1枚螺钉,安装微型外固定支架,术后缓慢、持续延长末节指骨。通过外观测量和影像学检查,评估手术效果,并进行满意度调查。结果共纳入35例患者,男12例,女23例;平均年龄29.5岁;左侧拇指17例,右侧拇指18例。牵张延长时间为10~17 d,平均12.3 d;外固定架维持时间为55~70 d,平均61.4 d;平均随访时间18.6个月。患侧拇指指甲的长度从(9.2±0.6)mm增加到(14.2±0.4)mm(P0.05)。拇指末节长度从(22.6±0.7)mm增加到(29.6±1.0)mm(P0.05)。94.3%(33例)的患者对手术效果满意。结论牵张延长法可以矫正D型短指症的短甲畸形,获得良好的美学外观和功能。

关键词：拇指 D型短指症指甲畸形牵张延长单侧