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环氧树脂/碳纤维复合材料模压制品力学性能影响因素分析

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中国塑料 2024年第2期38卷 26-32页

作者：赵川涛贾志欣刘立君李继强张臣臣荣迪高利珍王少峰浙江大学机械工程学院杭州310012 浙大宁波理工学院浙江宁波315100 浙江理工大学杭州310018 宁波益普乐模塑有限公司浙江宁波315615

通过正交实验研究模压工艺参数对环氧树脂/碳纤维(EP/CF)片状模塑料SMC模压成型制品力学性能的影响,分析了各工艺参数对制品拉伸强度和弯曲强度的影响趋势。通过方差分析,得到工艺参数对于拉伸强度的影响大小为合模速度>模压温度>模压压... 详细信息

通过正交实验研究模压工艺参数对环氧树脂/碳纤维(EP/CF)片状模塑料SMC模压成型制品力学性能的影响,分析了各工艺参数对制品拉伸强度和弯曲强度的影响趋势。通过方差分析,得到工艺参数对于拉伸强度的影响大小为合模速度>模压温度>模压压力>保压时间,工艺参数对于弯曲强度的影响大小为合模速度>模压压力>模压温度>保压时间,同时得到了对拉伸强度和弯曲强度的显著性因素;研究了拉伸破坏模式及失效机理,采用K-均值方法并选取典型试样观察,发现环氧树脂与基体的结合程度是影响拉伸强度的原因。

关键词：环氧树脂/碳纤维片状模塑料模压制品力学性能正交实验失效机理

经皮椎间孔镜术与传统开窗术治疗腰椎间盘突出症临床疗效比较

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中国初级卫生保健 2024年第4期38卷 107-110页

作者：凡军沙勇纪亲龙王少峰夏春欢上海市金山区亭林医院骨科上海201505

目的:比较经皮椎间孔镜术与传统开窗术治疗腰椎间盘突出症的临床疗效。方法:选取2020年3月—2022年6月在上海市金山区亭林医院骨科就诊的98例腰椎间盘突出症患者,采用随机数字表法将其分为对照组(n=49)和观察组(n=49)。对照组采用传统... 详细信息

目的:比较经皮椎间孔镜术与传统开窗术治疗腰椎间盘突出症的临床疗效。方法:选取2020年3月—2022年6月在上海市金山区亭林医院骨科就诊的98例腰椎间盘突出症患者,采用随机数字表法将其分为对照组(n=49)和观察组(n=49)。对照组采用传统开窗手术,观察组采用经皮椎间孔镜手术。结果:观察组患者出血量、手术时间及住院时间均少于对照组,差异有统计学意义(t值分别为44.387、15.639和11.514,P值均<0.05)。手术后3 d,两组患者血红蛋白及血钙水平均较手术前下降,但观察组患者血红蛋白及血钙水平下降幅度低于对照组,差异有统计学意义(t值分别为13.246、69.296,P值均<0.05)。两组患者视觉模拟评分法(Visual Analogue Scale,VAS)评分和Oswestry功能障碍指数(Oswestry Disability Index,ODI)评分均随术后时间延长而逐渐降低,且观察组治疗后1个月、治疗后3个月的VAS评分和ODI评分均低于对照组。观察组治疗有效率为93.88%,高于对照组(79.59%),差异有统计学意义(χ_(2)=4.346,P<0.05)。观察组术后并发症发生率为4.08%,低于对照组(16.33%),差异有统计学意义(χ_(2)=4.009,P<0.05)。结论:经皮椎间孔镜术相较于传统开窗手术治疗腰椎间盘突出,患者治疗效果更好。

关键词：经皮椎间孔镜术传统开窗术腰椎间盘突出症临床疗效

Silicon photonics integrated dynamic polarization controller

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Chinese Optics Letters 2022年第4期20卷 23-28页

作者： Xuyang wang Yanxiang jia Xubo Guo Janqiang Liu shaofeng wang Wenyuan Liu Fangyuan Sun Jun Zou Yongmin Li State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China College of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China School of Science North University of ChinaTaiyuan 030051China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore College of Science Zhejiang University of TechnologyHangzhou 310023China

We designed and demonstrated experimentally a silicon photonics integrated dynamic polarization *** overall size of the dynamic polarization controller on chip is 2.830 mm × 0.210 mm × 1 *** modulation bandwidth is 30 *** using a variable step simulated annealing approach,we achieve a dynamic polarization extinction ratio greater than 25 dB.A numerical simulation method was used to optimize the relevant parameters of the dynamic polarization *** is expected that the dynamic polarization controller can be utilized in fiber communication systems or silicon photonics integrated quantum communication systems to minimize the size and decrease the cost further.

关键词： dynamic polarization controller simulated annealing approach dynamic polarization extinction ratio

Ultrasound delivery of Chinese rhubarb promotes early recovery of gastrointestinal function after gastrectomy:a prospective randomized controlled study

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Journal of Bio-X Research 2021年第3期4卷 130-135页

作者： Hengbo Jia shaofeng wang Lujun Shen Jun You Fan Yang Masanobu Abe Yingying Xu Liang Zong Department of Nursing Changzhi People's HospitalThe Afiliated Hospital of Changzhi Medical CollegeChangzhiShanxi Province Department of Gastrointestinal Surgery Changzhi People's HospitalThe Afiliated Hospital of Changzhi Medical CollegeChangzhiShanxi Province Department of Gastroenterology Changzhi People's HospitalThe Afiliated Hospital of Changzhi Medical CollegeChangzhiShanxi Province Department of Gastointestinal Surgery The Frst Afiliated Hospital of Xiamen UniversityXiamenFujian Province Department of Central Laboratory Changzhi People's HospitalThe Afilated Hospital of Changzhi Medical CollegeChangzhiShanxi ProvinceChina Division for Health Senice Promotion University of Tokyo HospitalTokyoJapan Department of Gastrointestinal Surgery Yzheng People's HospitalCinical Medical CollegeYangzhou UniversityYangzhouJiangsu ProvinoeChina

Objective: Chinese rhubarb is a promising Chinese medicine for the promotion of gastrointestinal function. This study was conducted to investigate the safety and efficacy of Chinese rhubarb administered via ultrasound delivery in promoting the early recovery of gastrointestinal function after ***: In this prospective randomized controlled study, 100 patients who were scheduled to undergo total or subtotal gastrectomy in Changzhi People’s Hospital or Subei People’s Hospital from August 2017 to January 2018 were recruited. These patients were randomly assigned into two equal groups before surgery: 50 in the experimental (Chinese rhubarb) group, and 50 in the control (routine nursing) group. After surgery, time to flatus, bowel movement, clear liquid diet, and removal of nasogastric tube were recorded and analyzed. In addition, postoperative pain, postoperative bowel movement-related complications, and postoperative hospital stay duration were also recorded and analyzed. The study was approved by The protocol was approved by the Institutional Review Board of Changzhi People’s Hospital and Subei People’s Hospital on July 1, 2017 and registered with the Chinese Clinical Trial Registry on December 17, 2018 (registration number: ChiCTR1800020143).Results: Time to flatus (control group 85.68±22.00 hours vs experimental group 73.06±23.42 hours;P=0.007), bowel movement (5.52±1.56 vs 4.40±1.21 days;P<0.001), clear liquid diet (6.72±1.16 vs 6.22±1.28 days;P=0.044), and removal of nasogastric tube (6.30±1.52 vs 5.65±1.58 days;P=0.044) were significantly shorter in the experimental group compared with the control group, as was the postoperative hospital stay duration (14.30±3.46 vs 12.86±1.36 days;P=0.006). In addition, better pain relief (P=0.003) and a lower incidence of postoperative bowel movement-related complications (6 vs 21;P=0.001) were noted in the experimental ***: Ultrasound delivery of Chinese rhubarb is useful to promote the early recove

关键词： Chinese rhubarb gastrectomy gastrointestinal function randomized controlled trial ultrasound delivery

Outlier Robust Feature Correspondence by Learning Based Matching Process

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Journal of Systems Science & Complexity 2024年第4期37卷 1351-1367页

作者： YANG Xu ZENG shaofeng LIU Zhiyong State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation of Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

Feature correspondence is a crucial aspect of various computer vision and robot vision *** traditional optimization-based matching techniques,researchers have recently adopted a learning-based approach for matching,but these methods face challenges in dealing with outlier *** paper presents an outlier robust feature correspondence method that employs a pruned attentional graph neural network and a matching layer to address the outlier ***,the authors introduce a modified cross-entropy matching loss to handle the outlier *** a result,the proposed method significantly enhances the performance of learning-based matching algorithms in the presence of outlier *** experiments confirm the effectiveness of the proposed approach.

关键词： Feature correspondence graph neural network optimal transport problem pointmatching

Typical basin-fill sequences and basin migration in Yanshan, North China ——Response to Mesozoic tectonic transition

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Science China Earth Sciences 2004年第2期47卷 181-192页

作者： LI Zhong, LIU shaofeng, ZHANG Jinfang & wang Qingchen1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. China University of Geosciences, Beijing 100083, ChinaCorrespondence should be addressed to Li Zhong (email: lizhongd@***) Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China China University of Geosciences Beijing China

Basin-fill sequences of Mesozoic typical basins in the Yanshan area, North China may be divided into four phases, reflecting lithosphere tectonic evolution from flexure (T3), flexure with weak rifting (J1+2), tectonic transition (J3), and rifting (K). Except the first phase, the other three phases all start with lava and volcaniclastic rocks, and end with thick coarse clastic rocks and/or conglomerates, showing cyclic basin development rather than simple cyclic rift mechanism and disciplinary basin-stress change from extension to compression in each phase. Prototype basin analysis, based on basin-fill sequences, paleocurrent distribution and depositional systems, shows that single basin-strike and structural-line direction controlling basin development had evidently changed from east-west to northeast in Late Jurassic in the Yanshan area, although basin group still occurred in east-west zonal distribution. Till Early Cretaceous, main structural-line strike controlling basins just turned to northeast by north in the studied area.

关键词： Yanshan, Mesozoic, basin-fill, paleocurrent, tectonic transition.

Determination of Residual Monomers in Polycarboxylate Superplasticizer Using High Performance Liquid Chromatography

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Journal of Wuhan University of Technology(Materials Science) 2011年第3期26卷 439-442页

作者：郭丽萍 Department of Chemistry Wuhan University of Technology

A procedure was developed for the determination of residual monomers in polycarboxylate superplasticizer （PCs） by reversed-phase high performance liquid chromatography （RP-HPLC）.Four kinds of residual monomers were well separated and determined on a SinoChrom ODS-BP （C18） column with mobile phases composed of acetonitrile and phosphate buffer *** monomers were detected by UV detector at 205 nm and quantitatively analyzed with an external standard *** those residual monomers,the linear response ranged from 4.0×10-6 mol·L-1 to 2.0×10-3 mol·*** determination limit of acrylic acid,sodium methylallyl sulfonate and 2-Acrylamido-2-methylpropane sulfonic acid was 0.02×10-5 mol·L-1,while that of methoxy-polyethylene glycol monoacrylate was 0.1×10-5 mol·*** relative standard deviation （RSD） of high concentration samples was less than 1%,while that of the low concentration samples was between 1%-4%.The standard （additional） recovery ratio was 97.4% -104.2%.

关键词： polycarboxylate superplasticizer monomer HPLC copolymerization

PCBs and OCPs in sediments from Hongfeng Reservoir in Guizhou Province,China

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Chinese Journal Of Geochemistry 2006年第B8期25卷 69-70页

作者： Zhongqing WEI Congqiang LIU Xiaobing LIANG Fushun wang shaofeng wang State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

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原位反应锆英石结合的多孔SiC陶瓷的制备

硅酸盐学报 2011年第3期39卷 502-506页

作者：王少锋汪长安孙加林北京科技大学材料科学与工程学院北京100083 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室北京100084

以α-SiC粉和c-ZrO2粉为原料,聚乙烯醇缩丁醛(polyvinyl butyral,PVB)为造孔剂,通过干压成型,在空气气氛中无压烧结制备了原位反应锆英石结合的多孔SiC陶瓷。研究了烧结温度对多孔SiC陶瓷的相组成、线膨胀、开口气孔率、孔径分布及压缩... 详细信息

以α-SiC粉和c-ZrO2粉为原料,聚乙烯醇缩丁醛(polyvinyl butyral,PVB)为造孔剂,通过干压成型,在空气气氛中无压烧结制备了原位反应锆英石结合的多孔SiC陶瓷。研究了烧结温度对多孔SiC陶瓷的相组成、线膨胀、开口气孔率、孔径分布及压缩强度的影响,并对多孔SiC陶瓷的显微结构进行了分析。结果表明:PVB的分解和SiC颗粒间的堆积间隙产生气孔。SiC颗粒表面氧化生成的SiO2与ZrO2原位反应生成锆英石,SiC颗粒由锆英石和玻璃相结合。当烧结温度为1 500℃时,多孔SiC陶瓷的开口气孔率为50.3%,压缩强度达到38.7 MPa。

关键词：多孔陶瓷碳化硅锆英石造孔剂