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包布V带四工位硫化装备的设计

橡胶工业 2024年第10期71卷 777-782页

作者：宋丽荣咸静王蕾张卫锋青岛科技大学机电工程学院山东青岛266061

为提高小型短包布V带硫化的自动化水平,开发了包布V带四工位硫化装备。为克服包布V带传统硫化装置的不足,将包布V带硫化的上带、硫化、冷却、脱模四工位均布在可旋转的圆盘底座上,实现四工序连续且同步进行,同时在脱模工位引入脱模机械... 详细信息

为提高小型短包布V带硫化的自动化水平,开发了包布V带四工位硫化装备。为克服包布V带传统硫化装置的不足,将包布V带硫化的上带、硫化、冷却、脱模四工位均布在可旋转的圆盘底座上,实现四工序连续且同步进行,同时在脱模工位引入脱模机械手以代替人工完成脱模与模具转运。该四工位硫化装备提高了包布V带硫化的自动化水平,降低了工人劳动强度,实现了连续性硫化,使硫化罐开罐持续时间缩短,温度回升加快,减小了蒸汽消耗量,有助于节能生产。本设计可为包布V带全自动硫化生产提供参考。

关键词：包布V带硫化装备四工位脱模机械手

Combining serum cystatin C with creatinine, a new definition of contrast-induced acute kidney injury and its clinical implications

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中国循环杂志 2016年第Z1期31卷 -页

作者： Tuo zhang weifeng zhang Linghong Shen Ben He Renji Hospital Shanghai Jiaotong University School of Medicine Shanghai China

Background Contrast-induced acute kidney injury (CI-AKI), a powerful predictor of unfavorable long-term prognosis, was traditionally defined as an increase of serum creatinine (sCr) after contrastm edia (CM) exposure. Recently, serum cystatin C (sCyC) had been proposed as an alternative to sCr to detect acute changes in renal function. However, the increment cut-off point of sCyC to detect CI-AKI and the clinical implication of combining sCyC and sCr as new definition of CI-AKI remains to be further elucidated。[第一段]

关键词：基因肌酸酐肾血气分析预后铍

两种腹横肌平面阻滞方法在老年择期腹股沟疝修补术中的应用比较

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中华疝和腹壁外科杂志（电子版） 2024年第3期18卷 320-325页

作者：杨晓宇王佳张维峰陈雨辰南京中医药大学附属南京医院(南京市第二医院)麻醉科 210003

目的比较两种腹横肌平面(TAP)阻滞方法在老年择期腹股沟疝修补术中的应用效果。方法选取2021年1月至2022年12月于南京中医药大学附属南京医院择期行腹股沟疝修补术的老年患者90例,使用随机数字表法将患者分为对照组(45例,超声引导下侧路... 详细信息

目的比较两种腹横肌平面(TAP)阻滞方法在老年择期腹股沟疝修补术中的应用效果。方法选取2021年1月至2022年12月于南京中医药大学附属南京医院择期行腹股沟疝修补术的老年患者90例,使用随机数字表法将患者分为对照组(45例,超声引导下侧路TAP阻滞)和观察组(45例,超声引导下TAP两点阻滞),观察并比较2组围手术期指标、血流动力学参数、镇痛效果及应激指标,并观察恶心、呕吐等麻醉不良反应发生情况。结果2组患者的疝环直径、手术时间及术中出血等手术情况差异无统计学意义(P>0.05),观察组术后下床时间和住院时间较对照组缩短,差异有统计学意义(P0.05),术后1、3 d 2组患者IL-6、皮质醇明显升高,但观察组明显低于对照组(P<0.05);术后1、3 d,观察组胰岛素未见明显改变,而术后1 d对照组胰岛素明显低于术前,且与观察组比较差异有统计学意义(P<0.05)。治疗期间,观察组不良反应发生率明显低于对照组(P<0.05)。结论超声引导下腹横肌平面两点阻滞具有镇痛效果佳,血流动力学稳定,应激反应小及不良反应少的优点,可提高老年腹股沟疝修补术患者的手术舒适度及安全性,利于患者康复。

关键词：疝,腹股沟超声引导腹横肌平面阻滞疝修补术老年人

Effects of bias voltage on coating structures and anticorrosion performances of PA-PVD Al coated NdFeB magnets

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Journal of Rare Earths 2021年第6期39卷 703-711,I0004页

作者： Yujie Cao Pengjie zhang Wei Sun weifeng zhang Hanzhong Wei Jiquan Wang Bingshan Li Xiaofei Yi Guangqing Xu Yucheng Wu School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Rare Earth Permanent Magnet Materials Earth-Panda Advance Magnetic Material Co.Ltd.Hefei 231500China BGRIMM Magnetic Materials and Technology(Fu Yang)Co. Ltd.Fuyang 236000China BGRIMM Technology Group Co. Ltd.Beijing 102600China

Al coated NdFeB magnets were prepared by plasma-assisted-physical-vapor-deposition(PA-PVD)method fo r enhancing the corro sion *** rphologies and structures were characterized by an Xray diffractometer and a scanning electron *** behaviors of the samples with different bias voltages were studied by electrochemical methods and neutral salt spray test,*** bias voltage during the deposition process was optimized according to the coating structures and corrosion *** density and flatness of Al coating increase with increasing the bias voltage,and at the same time the thickness *** coating density and thickness turn to be stable when bias voltage is 1800 ***,the corrosion behaviors of PA-PVD Al coatings in different media,such as NaOH,HNO_(3) and NaCl solutions,were *** self-corrosion potentials(E_(corr)) of PA-PVD Al coatings almost keep constant in NaOH and HNO_(3) solutions with diffe rent ***,the self-corrosion current densities(J_(corr)) decrease with the increasing concentrations.E_(corr) shifts to negative potential and J_(corr)decreases gradually when increasing the concentration of NaCl *** corrosion mechanisms of Al coatings are discussed based on the corrosion behaviors in different media.

关键词： Physical vapor deposition Plasma assistance Al coating Sintered NdFeB Corrosion behavior Rare earths

THE SCIENCE AND TECHNOLOGY BACKYARD AS A LOCAL LEVEL INNOVATION INTERMEDIARY IN RURAL CHINA

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Frontiers of Agricultural Science and Engineering 2022年第4期9卷 558-576页

作者： Jinghan LI Cees LEEUWIS Nico HEERINK weifeng zhang Knowledge Technology and Innovation GroupWageningen University&ResearchWageningen 6706KNthe Netherlands Development Economics Group Wageningen University&ResearchWageningen 6706KNthe Netherlands College of Resources and Environmental Science China Agricultural UniversityBeijing 100193China College of Resources and Environment Anhui Agricultural UniversityHefei 230036China

Agricultural innovation can be described as a coevolutionary process of technological innovation,symbolic change,and social or institutional innovation,which relies on the interactions and collaboration between multiple *** view emphasizes the significance of innovation intermediaries in supporting the coevolution process of *** studies have provided evidence on how innovation intermediaries play roles in supporting the coevolution innovation process at a broader innovation system ***,little emphasis has been given to the role of innovation intermediaries in supporting the coevolution process of innovation at the community level in rural *** address this research gap,this paper offers a case study of a novel type of innovation support intervention designed to promote technical change at the community level,the Science and Technology Backyard(STB).The paper focuses on the efforts of a specific STB in Wangzhuang village to promote innovation in tillage methods in wheat *** aims was to examine the role of this newly emerging innovation support intervention in supporting the coevolution process of innovation at the community level,and compare the outcome of the coevolution process in the village with an STB to that in villages without an *** journey analysis is applied to understand the evolved intermediation roles in the innovation process,and multivariate regression analysis is employed to assess the outcome of the coevolution process in villages with and without an *** findings suggest that the roles of STBs have evolved from knowledge brokers to systemic innovation intermediaries that facilitate the coevolution process of innovation inside an STB *** has led to a higher adoption rate of improved technology,a better enabling environment for learning,and more effective institutional support in STB villages than in non-STB ***,the effect of support provided by a single STB on the coe

关键词： agricultural innovation coevolution community level innovation intermediaries Science and Technology Backyards(STBs)

人脂肪干细胞外泌体对糖尿病周围神经病变的作用及其机制

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中华烧伤与创面修复杂志 2024年第3期40卷 240-248页

作者：曹涛郝彤肖丹张伟锋计鹏贾艳慧王婧王许杰官浩陶克空军军医大学第一附属医院全军烧伤中心烧伤与皮肤外科西安710032 陕西师范大学生命科学院西安710032 解放军63600部队医院急诊科酒泉712750 温州医科大学附属第一医院创面修复与再生医学中心创面修复科温州325015

目的探讨糖尿病周围神经病变(DPN)中神经鞘胚素蛋白表达的变化及人脂肪干细胞(ADSC)外泌体对神经鞘胚素蛋白表达变化的调节作用。方法该研究为前瞻性观察性临床研究联合实验研究。将空军军医大学第一附属医院(以下简称本院)2022年5月—2... 详细信息

目的探讨糖尿病周围神经病变(DPN)中神经鞘胚素蛋白表达的变化及人脂肪干细胞(ADSC)外泌体对神经鞘胚素蛋白表达变化的调节作用。方法该研究为前瞻性观察性临床研究联合实验研究。将空军军医大学第一附属医院(以下简称本院)2022年5月—2023年10月收治的13例符合入选标准的DPN患者(男9例、女4例,年龄32~68岁)作为DPN组,将本院该段时间收治的5例符合入选标准的非糖尿病患者(男4例、女1例,年龄29~61岁)作为对照组。采集2组患者清创或截肢后弃用组织中的趾神经或腓肠神经组织,行苏木精-伊红染色后观察神经组织的病理学变化,行免疫荧光染色后观察神经组织中S100β、神经鞘胚素的蛋白表达并对神经鞘胚素蛋白表达进行定量,分别采用蛋白质印迹法和实时荧光定量反转录PCR法检测神经鞘胚素的蛋白和mRNA表达(DPN组样本数均为13,对照组样本数均为5)。取12只雄性3~5 d龄C57BL/6小鼠,提取施万细胞,并将细胞分为常规培养组(常规培养)、单纯高糖组(仅用高浓度葡萄糖溶液培养)、高糖+外泌体组(用高浓度葡萄糖溶液和提取的人ADSC外泌体培养)。培养24 h后,采用细胞计数试剂盒8检测细胞增殖活力(样本数为6);培养48 h后,采用蛋白质印迹法检测神经鞘胚素的蛋白表达(样本数为3)。结果相较于对照组,DPN组患者神经组织中神经支持细胞减少、炎症细胞增多,具有典型的神经损伤表现。免疫荧光染色检测显示,相较于对照组,DPN组患者神经组织中细胞核更多,S100β的蛋白表达更少;DPN组患者神经组织中神经鞘胚素蛋白表达为71±31,明显低于对照组的1729±62(t=76.92,P<0.05)。蛋白质印迹法检测显示,DPN组患者神经组织中的神经鞘胚素蛋白表达为0.74±0.08,明显低于对照组的0.97±0.06(t=5.49,P<0.05)。DPN组患者神经组织中神经鞘胚素的mRNA表达明显低于对照组(t=7.65,P<0.05)。培养24 h后,与常规培养组比较,单纯高糖组和高糖+外泌体组施万细胞增殖活力均明显降低(P<0.05);与单纯高糖组比较,高糖+外泌体组施万细胞增殖活力明显升高(P<0.05)。培养48 h后,与常规培养组比较,单纯高糖组、高糖+外泌体组施万细胞神经鞘胚素蛋白表达均明显降低(P<0.05);与单纯高糖组比较,高糖+外泌体组施万细胞神经鞘胚素蛋白表达明显升高(P<0.05)。结论DPN患者神经组织中神经鞘胚素的蛋白表达较正常神经组织降低,这可能与高糖降低了施万细胞增殖活力相关;人ADSC外泌体可能通过提高神经鞘胚素蛋白表达,改善施万细胞增殖活力,进而延缓DPN的进展。

关键词：糖尿病神经病变外泌体细胞增殖施万细胞神经鞘胚素脂肪干细胞

Fabrication of recyclable Fe^(3+) chelated aminated polypropylene fiber for efficient clean-up of phosphate wastewater

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 840-852页

作者： Shangyuan Zhao Fangjia Wang Rui Zhou Peisen Liu Qizhong Xiong weifeng zhang Chaochun zhang Gang Xu Xinxin Ye Hongjian Gao Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer of Anhui ProvinceCollege of Resources and EnvironmentAnhui Agricultural UniversityHefei 230036China Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration Ministry of Natural ResourcesCollege of Resources and EnvironmentAnhui Agricultural UniversityHefei 230036China Institute of Soil Science Chinese Academy of SciencesNanjing 210008China

Herein,a Fe^(3+)-loaded aminated polypropylene fiber has been reported as an efficient phosphate *** remarkable phosphate removal ability of the fiber is due to Fe^(3+)immobilization,and it demonstrates a maximum adsorption capacity of 33.94 mg·P·g^(–1).Adsorption experiments showed that the fiber is applicable over a wide pH range from 2 to ***,the adsorption kinetics and isotherm data were consistent with the pseudo-second-order and Langmuir adsorption models,*** adsorption equilibrium of the fiber for phosphate was reached within 60 min,indicating an efficient monolayer chemisorption ***,the adsorbent maintained prominent phosphate removal in the presence of competitive ions such as NO_(3)^(–)and Cl^(–),exhibiting high *** importantly,the fiber demonstrated excellent reusability(5 times)and low adsorption limit below 0.02 mg·P·g^(–1).In addition,the phosphate removal efficiency of the fiber can exceed 99%under continuous flow *** adsorption mechanism was studied by X-ray photoelectron spectroscopy,showing that the adsorption of phosphate on the fiber mainly depended on the chemical adsorption of the modified Fe^(3+).Overall,this study proves that the fiber possesses many advantages for phosphate removal,including high adsorption efficiency,lower treatment limit,good recyclability,and environmental friendliness.

关键词： phosphate adsorption aminated polypropylene fiber Fe^(3+) ligand exchange reusability

ISTC: A New Method for Clustering Search Results

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Wuhan University Journal of Natural Sciences 2008年第4期13卷 501-504页

作者： zhang Wei XU Baowen zhang weifeng XU Junling School of Computer Science and Engineering Southeast University Nanjing 211189 Jiangsu China State Key Laboratory of Software Engineering WuhanUniversity Wuhan 430072 Hubei China Department of Computer Nanjing University of Posts andTelecommunications Nanjing 210003 Jiangsu China

A new common phrase scoring method is proposed according to term frequency-inverse document frequency （TFIDF） and independence of the phrase. Combining the two properties can help identify more reasonable common phrases, which improve the accuracy of clustering. Also, the equation to measure the in-dependence of a phrase is proposed in this paper. The new algorithm which improves suffix tree clustering algorithm （STC） is named as improved suffix tree clustering （ISTC）. To validate the proposed algorithm, a prototype system is implemented and used to cluster several groups of web search results obtained from Google search engine. Experimental results show that the improved algorithm offers higher accuracy than traditional suffix tree clustering.

关键词： Web search results clustering suffix tree term frequency-inverse document frequency (TFIDF) independence of phrases

Cr3和Cr5系支承辊大型锻件脱氧工艺研究

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江西冶金 2024年第1期44卷 25-33页

作者：何川张延玲王冠博戴乐张威风石如星北京科技大学钢铁冶金新技术国家重点实验室北京100083 洛阳中重铸锻有限责任公司洛阳471039

由于Cr3和Cr5系支承辊钢液中铬含量增加会抑制铝脱氧反应的进行。本文以Cr3和Cr5系支承辊冶金过程中脱氧工艺为研究背景,通过实验室脱氧实验,利用FactSage 8.1软件计算Cr3和Cr5系轧辊钢中氧含量,绘制铝脱氧平衡曲线,将Wagner模型与炉渣... 详细信息

由于Cr3和Cr5系支承辊钢液中铬含量增加会抑制铝脱氧反应的进行。本文以Cr3和Cr5系支承辊冶金过程中脱氧工艺为研究背景,通过实验室脱氧实验,利用FactSage 8.1软件计算Cr3和Cr5系轧辊钢中氧含量,绘制铝脱氧平衡曲线,将Wagner模型与炉渣共存理论相结合,建立了钢渣反应模型,探讨铬含量对钢液中铝脱氧效果的影响。结果表明,钢液中铬含量在一定范围内增加会抑制铝脱氧反应进行;在精炼过程中,当Cr3系支承辊中铝含量控制在0.03%左右、Cr5系支承辊中铝含量控制在0.05%左右时,可将氧含量有效控制在10^(-5)以下;而与之相匹配的最佳炉渣成分的碱度为2.5~3.0,w(Al_(2)O_(3))>20%。

关键词：轧辊钢脱氧工艺铬含量钢渣反应模型炉渣共存理论