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Introduction and Influence of Water in the Preparation of Crosslinked PVC Foam by Isocyanate

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Chemical Research in Chinese Universities 2023年第5期39卷 782-789页

作者： BI Xiang LI Minggang LU Min YOU jiangan xue jian YU Haihui jianG Zhiwei TANG Tao College of Chemical Engineering Northeast Electric Power UniversityJilin 132011P.R.China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022P.R.China College of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026P.R.China

In the preparation process of crosslinked polyvinyl chloride(c-PVC)foam by isocyanate,the formulated mixture is generally required to be carried out under the condition of isolated water,so as to avoid the mixing difficulties caused by the reaction between the introduced water and *** this paper,NaHCO_(3) was added to the mixture to indirectly introduce water into the system,and the effects of NaHCO_(3) on the cell structure and curing time of c-PVC foam were *** results showed that NaHCO_(3) not only played a role of foaming agent,but also was a good nucleating agent for *** the same time,the introduction of NaHCO_(3) held back the exudation of modified diphenylmethane-4,4'-diisocyanate(MDI)on the cell *** effects of NaHCO_(3) on the cell structure and aggregation structure of c-PVC foam were studied by thermogravimetric analysis,infrared spectroscopy and scanning electron *** results showed that decomposition of NaHCO_(3) occurred during the molding stage,which made small amount of MDI react with water to form polyurea,improved the compatibility of MDI with PVC and inhibited the exudation of MDI.

关键词： Crosslinked PVC foam Isocyanate Water Curing Sodium bicarbonate

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双官能化溶聚丁苯橡胶在轮胎胎面胶中的应用

合成橡胶工业 2024年第3期47卷 247-251页

作者：默云娟薛健李锦彦张玺于杰中国石油独山子石化公司研究院新疆克拉玛依833699 中国石油独山子石化公司生产运行处新疆克拉玛依833699 新疆橡塑材料实验室新疆克拉玛依833699

使用国产双端官能化产品SSBR2060-N和日本Zeon公司单端官能化产品Nipol■NS616进行成品轮胎试制及性能评价。结果表明,使用SSBR2060-N制备的成品轮胎外边缘尺寸达到技术标准,抗湿滑性能和滚动阻力均达到了欧洲议会和欧盟理事会联合颁布... 详细信息

使用国产双端官能化产品SSBR2060-N和日本Zeon公司单端官能化产品Nipol■NS616进行成品轮胎试制及性能评价。结果表明,使用SSBR2060-N制备的成品轮胎外边缘尺寸达到技术标准,抗湿滑性能和滚动阻力均达到了欧洲议会和欧盟理事会联合颁布的轮胎标签法规EU2020/740规定的双B轮胎级别,强度性能、高速性能和耐久性能等均与使用Nipol■NS616制备的成品轮胎相当且均能够满足国家标准要求。

关键词：双端官能化溶聚丁苯橡胶轮胎胎面胶双B级轮胎物理机械性能动态力学性能成品轮胎性能

Identification of Andrographis Herba and its common products using mini-barcode

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Chinese Journal of Natural Medicines 2022年第5期20卷 393-400页

作者： XIONG Chao HUANG Chen-Hao WU Lan XU Ran xue jian-Ping LIU Zhi-Guo SUN Wei School of Life Science and Technology Wuhan Polytechnic UniversityWuhan 430023China Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing 100700China College of Life Sciences Huaibei Normal UniversityHuaibei 235000China

Andrographis Herba,the aerial part of Andrographis paniculata(Burm.f.)*** Nees(Acanthaceae),has a wide geographic distribution and has been used for the treatment of fever,cold,inflammation,and other infectious *** markets,sellers and buyers commonly inadvertently confuse with related *** addition,most Chinese medicinal herbs are subjected to traditional processing procedures,such as steaming and boiling,before they are sold at dispensaries;therefore,it is very difficult to identify Andrographis Herba when it is processed into Chinese *** identification of species and processed medicinal materials is a growing issue in the ***,conventional methods of identification have limitations,while DNA barcoding has received considerable attention as a new potential means to identify species and processed medicinal *** this study,17 standard reference materials of ***,2 standard decoctions,27 commercial products and two adulterants were *** on the ITS2 sequence,it could successfully identify *** and ***,a nucleotide signature consisting of 71 bp was designed,this sequence is highly conserved and specific within *** while divergent among other ***,we used these new primers to amplify the nucleotide signature region from processed *** conclusion,the DNA barcoding method developed in the present study for authenticating *** is rapid and *** can be used in the future to guarantee the quality of Andrographis Herba of each regulatory link for clinical use.

关键词： DNA barcoding Andrographis Herba Andrographis paniculata Molecular identification

卵巢癌患者人附睾蛋白4 miR-200a抗心磷脂抗体临床表达意义及诊断价值

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中国妇幼保健 2024年第7期39卷 1307-1310页

作者：薛建芳余月琴伊艳如毕华湖州市中医院妇产科浙江湖州313000

目的探讨卵巢癌患者的人附睾蛋白4(HE4)、miR-200a、抗心磷脂抗体(ACA)表达变化及诊断价值。方法选取2020年3月—2022年6月湖州市中医院收治的25例卵巢癌患者和25例健康志愿者为研究对象,依次纳入病例组、健康组;收集病例组患者的临床... 详细信息

目的探讨卵巢癌患者的人附睾蛋白4(HE4)、miR-200a、抗心磷脂抗体(ACA)表达变化及诊断价值。方法选取2020年3月—2022年6月湖州市中医院收治的25例卵巢癌患者和25例健康志愿者为研究对象,依次纳入病例组、健康组;收集病例组患者的临床分期资料,检测两组研究对象的HE4、miR-200a及ACA表达差异,绘制ROC曲线分析HE4、miR-200a及ACA指标对诊断卵巢癌的临床效能。结果与健康组比较,病例组的HE4、miR-200a及ACA均呈高表达(P<0.05);HE4、miR-200a及ACA 3项检查联合诊断准确率、AUC、灵敏度及特异度均明显高于单独诊断(t=27.458、30.158、11.645、21.867、19.421,均P<0.05)。结论HE4、miR-200a和ACA在卵巢癌患者中异常高表达,HE4、miR-200a及ACA 3项可作为卵巢癌重要的肿瘤标记物,3项联合诊断可以作为卵巢癌筛查的有效参考方案。

关键词：卵巢癌人附睾蛋白4 miR-200a 抗心磷脂抗体诊断价值

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真空联合堆载预压处理路基变形影响范围研究

公路 2024年第3期69卷 56-62页

作者：黄志华问建学马祖遥唐昌意肖景平李松何忠意姜立宝珠海市规划设计研究院珠海市519000 中交公路规划设计院有限公司北京市100010 西南交通大学土木工程学院成都市611756 珠海市建设安全科学研究院有限公司珠海市519000 中国铁建港航局总承包分公司珠海市519000

确定真空联合堆载预压处理路基变形影响范围是工程建设项目中的重难点。依托珠海保税区某工程,以海陆交互相软土地基为研究对象,对现场真空联合堆载预压处理路段路基变形实测数据开展分析,采用PLAXIS进行数值模拟,将实测结果与数值分析... 详细信息

确定真空联合堆载预压处理路基变形影响范围是工程建设项目中的重难点。依托珠海保税区某工程,以海陆交互相软土地基为研究对象,对现场真空联合堆载预压处理路段路基变形实测数据开展分析,采用PLAXIS进行数值模拟,将实测结果与数值分析结果进行对比,并利用数值分析方法对相关不同影响因素进行分析。研究结果表明,真空联合堆载预压处理路基变形影响范围随处理时间增加而增大;随与路基距离的增大,地表水平向影响半径减小;距离处理边线越近,深层软土挤压效果越明显,距离处理边线超过15 m后深层软土挤压效果明显减弱;数值模拟结果与实测数据较吻合;地表最大影响半径随素填土模量增加而减小,随淤泥厚度增大而增大,随排水板长度增大而增大;真空联合堆载预压路基变形影响范围小于20 m。

关键词：路基工程软土地基真空联合堆载预压路基变形影响范围数值模拟

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油页岩灰渣制备Na-X型沸石及其吸附性能研究

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吉林建筑大学学报 2024年第3期41卷 29-34页

作者：王睿张学建李永涛陈杰高语声吉林建筑大学材料科学与工程学院长春130118

水体中的亚甲基蓝分子对生态环境造成了严重的危害,也在一定程度上威胁着人类的健康。本文以油页岩加工的副产物油页岩灰渣为原料,采用碱熔融-水热合成法合成了Na-X型沸石,并探讨导向剂的使用量、NaOH的用量、水热温度、水热时间和酸浸... 详细信息

水体中的亚甲基蓝分子对生态环境造成了严重的危害,也在一定程度上威胁着人类的健康。本文以油页岩加工的副产物油页岩灰渣为原料,采用碱熔融-水热合成法合成了Na-X型沸石,并探讨导向剂的使用量、NaOH的用量、水热温度、水热时间和酸浸浓度对沸石结晶度的影响,最终得到合成沸石的最佳条件。用合成的Na-X型沸石处理水溶液中亚甲基蓝分子,得到吸附平衡数据采用吸附等温线和吸附动力学模型进行拟合。结果表明,朗格缪尔等温线模型和伪二阶动力学模型与亚甲基蓝的吸附数据相吻合,表明Na-X型沸石对亚甲基蓝的吸附过程属于单层的化学吸附过程。综上所述,由油页岩灰渣制备的Na-X型沸石材料可作为吸附水溶液中亚甲基蓝分子的吸附剂。

关键词： Na-X型沸石吸附亚甲基蓝

Hexagonal boron nitride based slippery liquid infused porous surface with anti-corrosion, anti-contaminant and anti-icing properties for protecting magnesium alloy

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Chinese Chemical Letters 2024年第4期35卷 532-538页

作者： Wenhao Yan Shuaiya xue xuerui Zhao Wei Zhang jian Li Key Laboratory of Eco-Functional Polymer Materials of the Ministry of Education College of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China

In an era where the concept of green development is deeply rooted, magnesium(Mg) alloy as a light metal has a long-term development prospect in the process of energy saving, emission reduction and environmental improvement. However, anti-corrosion performance of Mg alloy is poor due to the high chemical activity and low equilibrium potential, which limits the development of Mg alloy ***, three-dimensional mesopore hollow polypyrrole spheres(MHPS) were prepared, and the MHPS was inserted into the middle of the stacked hexagon boron nitride(h-BN) lamellae, which allowed the hBN to be separated forming a further composite with abundant pore structure. Subsequently, the MHPS/hBN-OH composite was uniformly sprayed on the Mg alloy surface via simple spraying method to form the superhydrophobic surface(SHS). Finally, the slippery liquid infused porous surface(SLIPS) was successfully fabricated by applying drops of silicone lubricant on the superhydrophobic coating surface. After a series of characterization and testing, the results showed that the stacking of h-BN lamellae was significantly reduced after h-BN was successfully embedded by MHPS. In addition, the fabricated SLIPS have excellent self-cleaning, mechanical stability, anti-icing and anti-corrosion properties. Therefore, the method of embedding polymer microspheres not only offers a new strategy for h-BN exfoliation, but also the successful prepared SLIPS largely retards the corrosion of Mg alloy while providing new ideas for the development of SLIPS.

关键词： Anti-corrosion Mg alloy Hexagon boron nitride Polypyrrole SLIPS

Effect of nourishing Yin and purging fire Chinese herbal mixture on delaying light-induced premature puberty in rats

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Journal of Traditional Chinese Medicine 2024年第1期44卷 95-102页

作者： SUN Yanyan xue Yuanyuan SUN Wen WANG Yonghong YU jian Department of Traditional Chinese Medicine Children's Hospital of Fudan UniversityShanghai 201102China Department of Pediatrics Zibo Central HospitalZibo 255000China

OBJECTIVE:To elucidate the mechanism of the nourishing Yin and purging fire Chinese herbal mixture(NYPF)in delaying light-induced premature puberty in ***:Twenty-one days old female SpragueDawley rats were randomly assigned to normal group(N),long light exposure group(L),NYPF and normal saline group(NS).Rats in the L,NYPF and NS groups were exposed to 16 h:350 lux light/8 h:dark,while rats in the N group were exposed to 12 h:50 lux light/12 h:*** and normal saline was administered to the rats in the NYPF group or NS group,respectively,from day *** rats in every group were sacrificed at 9 *** day 28(P28),on the day when rat's vulva opened in the L group(L-VO),on the day when the first estrous interphase occurred in rats of L group(L-E1),and on the day when the second estrous interphase occurred in rats of L group(L-E2),***:On day 34,all rats in the L group,80%of rats in the NS group,40%of rats in the N group,and 20%of rats in the NYPF group showed complete opening of the *** P28,m RNA level of hypothalamic kisspeptin(Kiss-1)in the L group was significantly higher than that in the N group(P<0.05).The rats in the L and NS groups had significantly lower hypothalamic argininephenylalanine-amide(RFamide)-related peptide 3(RFRP-3)m RNA levels than those in the N group(P<0.05),whereas RFRP-3 m RNA level was significantly higher in the NYPF group than that in the L group(P<0.05).At L-VO,the ovarian index of the L and NS groups was significantly higher than that of the N group(P<0.05)and estradiol(E2)level of the NYPF group was significantly lower than that of the N and NS groups(P<0.05);hypothalamic Kiss-1 m RNA level in the L and NS groups was significantly higher than that in the N and NYPF groups(P<0.05),whereas hypothalamic RFRP-3 m RNA level in the L,NYPF,and NS groups was significantly lower than that in the N group(P<0.05).At L-E1,E2 level of the L and NS groups was significantly higher than that of the N group(P<0.01),wher

关键词： light puberty precocious kisspeptins RFRP-3 melatonin Nourishing Yin and Purging Fire

运用PDCA提升肿瘤专科医院首台手术准时开台率

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现代医院管理 2024年第2期22卷 87-90页

作者：王方方周学健戴子薇王雪云江苏省肿瘤医院南京市210000

提高首台手术准时开台率对提高医院手术效率和运行效率,加强医疗质量和安全有重要意义。运用PDCA循环对某肿瘤专科医院首台手术准时开台率现状进行调查并分析原因,找出核心影响因素,据此制定改进计划,并运用熵权法、手术医生行为管理系... 详细信息

提高首台手术准时开台率对提高医院手术效率和运行效率,加强医疗质量和安全有重要意义。运用PDCA循环对某肿瘤专科医院首台手术准时开台率现状进行调查并分析原因,找出核心影响因素,据此制定改进计划,并运用熵权法、手术医生行为管理系统等方法落实改进措施。2021年6月,首台手术准时开台率为98.17%,比2020年3-12月首台准时开台率(64.31%)提高了33.86个百分点,2021年6月至2022年6月,首台准时开台率为95.66%。

关键词：首台手术准时开台率 PDCA 影响因素运行效率