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交联改性对静电纺乌拉草提取液/聚乙烯醇纳米纤维膜性能的影响 被引量:6
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作者 荆妙蕾 杨冰杰 +3 位作者 周捷 胡敏 王春红 左祺 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2021年第6期71-78,共8页
为了优化用于医用敷料的乌拉草提取液/聚乙烯醇纳米纤维膜的耐水性,对制备好的纤维膜进行气相交联改性。选用戊二醛和浓盐酸作为交联剂和催化剂,在满足医用敷料性能的基础上提高膜的耐水性,进而提高抗菌性,并研究交联时间对膜的影响,确... 为了优化用于医用敷料的乌拉草提取液/聚乙烯醇纳米纤维膜的耐水性,对制备好的纤维膜进行气相交联改性。选用戊二醛和浓盐酸作为交联剂和催化剂,在满足医用敷料性能的基础上提高膜的耐水性,进而提高抗菌性,并研究交联时间对膜的影响,确定最优交联时间。采用扫描电子显微镜、电子单纤强力仪及红外光谱仪对改性前后膜的微观形貌、力学性能及分子结构进行表征,并对膜的透气性和孔隙率、接触角和吸水性以及抗菌性进行测试。结果表明,经戊二醛交联改性后,纳米纤维膜的接触角从16°逐渐增大到78°,耐水性显著提高;其形貌、水蒸气透过率及孔隙率均能满足医用敷料的要求。随着交联时间的延长,其力学性能和吸水倍率先增强后减弱,在交联4 h时分别达到最大值(7.34±0.80)MPa和857%;其抗菌性在交联2 h时达到最优,此时大肠杆菌和金黄色葡萄球菌的抑菌圈直径分别为3.0 mm和1.1 mm。由以上结论得出,交联2 h和4 h的纳米纤维膜的综合性能最好。 展开更多
关键词 医用敷料 乌拉草提取液 聚乙烯醇 戊二醛 抗菌性
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PBAT微孔膜/汉麻水刺非织造布复合功能膜的制备及防水透湿性能 被引量:2
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作者 杨璐 高涵超 +5 位作者 王春红 王晓云 左祺 王利剑 赵润 高欢 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2022年第6期103-110,共8页
为开发具有一定防水透湿功能的绿色环保可降解医用防护材料,制备了聚己二酸/对苯二甲酸丁二醇酯(PBAT)微孔膜/汉麻水刺非织造布复合膜。首先,采用水刺工艺将汉麻、棉纤维混合制备非织造布,然后利用非溶剂致相分离法在汉麻/棉水刺非织造... 为开发具有一定防水透湿功能的绿色环保可降解医用防护材料,制备了聚己二酸/对苯二甲酸丁二醇酯(PBAT)微孔膜/汉麻水刺非织造布复合膜。首先,采用水刺工艺将汉麻、棉纤维混合制备非织造布,然后利用非溶剂致相分离法在汉麻/棉水刺非织造材料上制备PBAT微孔膜。对不同铸膜液浓度、不同预蒸发时间、不同膜厚度微孔膜/水刺非织造布复合膜的平均孔径进行单因素实验,并通过响应曲面试验优化了复合膜的最优工艺。探究了覆膜前后材料的力学性能、孔径、接触角、耐静水压和透湿性能进行了对比分析。结果表明,PBAT微孔膜最佳制备工艺条件为,铸膜液浓度为14.34%、预蒸发时间为44.63 s、膜厚度为0.16 mm。使用最优工艺制备的复合膜力学性能与耐静水压均大于水刺非织造材料,孔径和透湿量均小于水刺非织造材料,接触角略小于水刺非织造材料。 展开更多
关键词 汉麻纤维 水刺非织造布 聚己二酸/对苯二甲酸丁二醇酯 微孔膜 防水透湿 响应曲面法
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Yeast protein-protein interaction network model based on biological experimental data
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作者 chunhong wang Shuiming CAI +1 位作者 Zengrong LIU Youwen CHEN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2015年第6期827-834,共8页
Duplication and divergence have been widely recognized as the two domi- nant evolutionary forces in shaping biological networks, e.g., gene regulatory networks and protein-protein interaction (PPI) networks. It has ... Duplication and divergence have been widely recognized as the two domi- nant evolutionary forces in shaping biological networks, e.g., gene regulatory networks and protein-protein interaction (PPI) networks. It has been shown that the network growth models constructed on the principle of duplication and divergence can recapture the topo- logical properties of real PPI networks. However, such network models only consider the evolution processes. How to select the model parameters with the real biological experi- mental data has not been presented. Therefore, based on the real PPI network statistical data, a yeast PPI network model is constructed. The simulation results indicate that the topological characteristics of the constructed network model are well consistent with those of real PPI networks, especially on sparseness, scale-free, small-world, hierarchical modularity, and disassortativity. 展开更多
关键词 YEAST duplication-divergence protein-protein interaction (PPI) network disassortativity
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Research Progress on Ocular Surface Changes after Femtosecond Laser Small IncisionLenticule Extraction
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作者 Xiangfei Chen Yan Lu +1 位作者 chunhong wang Zhenping Huang 《Eye Science》 CAS 2015年第1期48-52,共5页
The femtosecond laser has a number of advantages,.such as short pulse time,.high instantaneous power,.high repetition rate, low monopulse energy, and small thermal effect. Femtosecond laser-assisted small incision len... The femtosecond laser has a number of advantages,.such as short pulse time,.high instantaneous power,.high repetition rate, low monopulse energy, and small thermal effect. Femtosecond laser-assisted small incision lenticule extraction(SMILE) is becoming the new direction in refractive surgery,and the ocular surface changes after SMILE are attracting increasingly more attention. This article reviews adverse effects,including dry eye, injury of corneal nerves, and ocular surface inflammation,.occurring after SMILE. 展开更多
关键词 飞秒激光 SMILE 提取 脉冲时间 瞬时功率 高重复率 脉冲能量 激光辅助
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SMILE与改良去瓣Epi-LASIK矫正近视的疗效比较 被引量:4
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作者 陈祥菲 陆燕 +2 位作者 王春红 杨丽萍 黄振平 《中华眼视光学与视觉科学杂志》 CAS CSCD 2018年第5期297-305,共9页
目的:比较飞秒激光小切口角膜基质透镜取出术(SMILE)与改良去瓣机械法准分子激光原位角膜上皮瓣下磨镶术(Epi-LASIK)矫正近视术后1年的临床效果.方法:回顾性病例对照研究.选择2013年3月至2014年8月在南京总医院行SMILE的近视散光... 目的:比较飞秒激光小切口角膜基质透镜取出术(SMILE)与改良去瓣机械法准分子激光原位角膜上皮瓣下磨镶术(Epi-LASIK)矫正近视术后1年的临床效果.方法:回顾性病例对照研究.选择2013年3月至2014年8月在南京总医院行SMILE的近视散光患者52例(103眼)作为SMILE组,行改良去瓣Epi-LASIK的近视散光患者43例(86眼)作为Epi-LASIK组.分别在术前,术后1d、1周、1个月、3个月、6个月、1年测量患者的裸眼视力(UCVA)、最佳矫正视力(BCVA)、残余散光、等效球镜度(SE),并于术后1年测量2组的对比敏感度(CS)、调制传递函数(MTF)、波前像差等.采用重复测量方差分析、t检验和卡方检验对数据进行分析.结果:术后1d及1周,SMILE组UCVA优于Epi-LASIK组,差异均有统计学意义(t=5.065、5.994,P〈0.001),余时间段2组间UCVA差异均无统计学意义.术后1年,2组间SE在±0.50D和±1.00D范围内的眼数百分比差异均无统计学意义,SMILE组柱镜度在±0.50D范围内的眼数百分比高于Epi-LASIK组,差异有统计学意义(χ2=10.734,P=0.001).术后1年,SMILE组在有眩光低空间频率(3、6cpd)的CS高于Epi-LASIK组,差异均有统计学意义(t=4.106、3.848,P〈0.001);2组在有眩光余空间频率和无眩光所有空间频率的CS差异均无统计学意义.在4mm瞳孔直径下,2组间全眼像差、低阶像差、高阶像差、球差、慧差、三叶草像差及MTF值在各空间频率上的差异均无统计学意义.在6mm瞳孔直径下,SMILE组的高阶像差、球差低于Epi-LASIK组,差异均有统计学意义(t=3.881、6.843,P〈0.001),2组间其他像差差异均无统计学意义;SMILE组在低空间频率和高空间频率(5、20、25、30cpd)的MTF值均高于Epi-LASIK组,差异均有统计学意义(t=3.272,P=0.001;t=2.926,P=0.004;t=3.280,P=0.001;t=3.975,P〈0.001),其他空间频率差异均无统计学意义.结论:SMILE与改良去瓣Epi-LASIK矫正近视均安全、有效、稳定、预测性好,但SMILE对散光的矫正准确性更佳,且在6mm瞳孔直径下的视觉质量优于改良去瓣Epi-LASIK. 展开更多
关键词 飞秒激光小切口角膜基质透镜取出术 准分子激光原位角膜磨镶术 对比敏感度 调制传递函数 像差
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聚乙烯醇乳液改性对汉麻秸秆纤维/水泥基复合材料性能的影响 被引量:3
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作者 王春红 左祺 +3 位作者 支中祥 徐磊 SARANI Zakaria SHERAZ Hussain Siddique Yousfani 《复合材料学报》 EI CAS CSCD 北大核心 2021年第5期1567-1575,共9页
为解决汉麻秸秆纤维/水泥基复合材料力学性能较差的问题,本文提出采用聚乙烯醇(PVA)乳液对汉麻秸秆纤维/水泥基复合材料进行改性。在优化秸秆纤维的粒径和掺入量后,采用PVA乳液与秸秆纤维和水泥进行共混成型,制备了改性后的汉麻秸秆纤维... 为解决汉麻秸秆纤维/水泥基复合材料力学性能较差的问题,本文提出采用聚乙烯醇(PVA)乳液对汉麻秸秆纤维/水泥基复合材料进行改性。在优化秸秆纤维的粒径和掺入量后,采用PVA乳液与秸秆纤维和水泥进行共混成型,制备了改性后的汉麻秸秆纤维/水泥基复合材料。研究了不同质量比的PVA乳液对汉麻秸秆纤维/水泥基复合材料的抗折强度、密度、比强度和弯曲韧性的影响,通过含水率、吸水率及红外光谱测试揭示了PVA乳液对汉麻秸秆纤维/水泥基复合材料的改性机制。结果表明:汉麻秸秆纤维粒径为1700μm及掺入量为12%时,秸秆纤维对汉麻秸秆纤维/水泥基复合材料的增强作用最好。随着PVA乳液质量比的增加,改性后汉麻秸秆纤维/水泥基复合材料的密度逐渐减小,弯曲韧性逐渐提高。当PVA乳液质量比为4.8%时,相较于未改性的汉麻秸秆纤维/水泥基复合材料,改性后的汉麻秸秆纤维/水泥基复合材料抗折强度和比强度分别提高了17.17%和20.50%。通过PVA乳液改性使汉麻秸秆纤维/水泥基复合材料中秸秆纤维与水泥之间的界面得到改善,并缓解了秸秆纤维对水泥水化反应的阻碍作用。 展开更多
关键词 汉麻秸秆纤维 水泥基复合材料 聚乙烯醇(PVA)乳液 界面 水化反应
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LG-ESSs and HG-ESSs:underlying molecular alterations and potential therapeutic strategies 被引量:3
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作者 Chunhui LI chunhong wang 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2021年第8期633-646,共14页
Endometrial stromal tumors(ESTs)include endometrial stromal nodule(ESN),low-grade endometrial stromal sarcoma(LG-ESS),high-grade endometrial stromal sarcoma(HG-ESS),and undifferentiated uterine sarcoma(UUS).Since thes... Endometrial stromal tumors(ESTs)include endometrial stromal nodule(ESN),low-grade endometrial stromal sarcoma(LG-ESS),high-grade endometrial stromal sarcoma(HG-ESS),and undifferentiated uterine sarcoma(UUS).Since these are rare tumor types,there is an unmet clinical need for the systematic therapy of advanced LG-ESS or HG-ESS.Cytogenetic and molecular advances in ESTs have shown that multiple recurrent gene fusions are present in a large proportion of LG-ESSs,and HG-ESSs are identified by the tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein epsilon(YWHAE)-family with sequence similarity 22(FAM22)fusion.Recently,a group of ESSs harboring both zinc finger CCCH domain-containing protein7 B(ZC3H7B)-B-cell lymphoma 6 corepressor(BCOR)fusion and internal tandem duplication(ITD)of the BCOR gene have been provisionally classified as HG-ESSs.In this review,we firstly describe current knowledge about the molecular characteristics of recurrent aberrant proteins and their roles in the tumorigenesis of LG-ESSs and HG-ESSs.Next,we summarize the possibly shared signal pathways in the tumorigenesis of LG-ESSs and HG-ESSs,and list potentially actionable targets.Finally,based on the above discussion,we propose a few promising therapeutic strategies for LG-ESSs and HG-ESSs with recurrent gene alterations. 展开更多
关键词 Low-grade endometrial stromal sarcoma(LG-ESS) High-grade endometrial stromal sarcoma(HG-ESS) Molecular genetics THERAPEUTICS
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Self-polymerization and co-polymerization kinetics of gadolinium methacrylate 被引量:1
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作者 chunhong wang Shuai wang +3 位作者 Yujuan Zhang Zhifeng wang Junliang Liu Ming Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2018年第3期298-303,共6页
Gadolinium methacrylate(Gd(MAA)3) was synthesized by using gadolinium oxide and methacrylic acid as the starting materials and its self-polymerization kinetic was studied based on non-isothermal and isothermal ana... Gadolinium methacrylate(Gd(MAA)3) was synthesized by using gadolinium oxide and methacrylic acid as the starting materials and its self-polymerization kinetic was studied based on non-isothermal and isothermal analysis. Moreover, the monomer reactivity ratios of methyl methacrylate(MMA) and Gd(MAA)3 were evaluated by using Kelen-Tiidos method. The thermal neutron shielding properties of PMMA and poly(MMA-co-Gd(MAA)3) were calculated by MCNP program. The results show that the selfpolymerization of Gd(MAA)3 can be initiated by thermal and free radical and its activation energy is103.35 kJ/mol or 58.55 kJ/mol correspondingly in the solid state or aqueous solution. The polymerization rate,Rp,under low conversion at 65 ℃ is expressed as Rp = K[M]^(1.05)[I]^(0.60). The reactivity ratios of r1(MMA) and r2(Gd(MAA)3) are 0.225 and 1.340, respectively. The ability of thermal neutron shielding of poly(MMA-co-Gd(MAA)3) is increased by gadolinium contents and is far better than PMMA. 展开更多
关键词 Gadolinium methacrylate Thermal analysis Polymerization kinetic Thermal neutron shielding Rare earths
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The accelerator control system of CSNS
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作者 Yuliang Zhang Dapeng Jin +19 位作者 Peng Zhu Yongcheng He Xuan Wu Mingtao Kang Fengqin Guo Lin wang Gang Li Wenchun Gao chunhong wang Ge Lei Jincan wang Jia Liu Guanglei Xu Zhuo Zhao Mingchuan Zhan Youheng wang Xiangcheng Kong Yimin Han Xiaoli wang Qi le 《Radiation Detection Technology and Methods》 CSCD 2020年第4期478-491,共14页
The China Spallation Neutron Source is an accelerator-based user facility for neutron,proton,muon applications and so on.The designed proton beam power is 100 kW for the first phase.Overall,the scope of accelerator co... The China Spallation Neutron Source is an accelerator-based user facility for neutron,proton,muon applications and so on.The designed proton beam power is 100 kW for the first phase.Overall,the scope of accelerator control system covers four parts,the global systems,the device layer local controls and remote controls,the high-level applications and services and the integration of conventional facilities.The principle guideline is to adopt as many as possible matured technologies and commercial products in the design and implementation.The control system is based on Experimental Physics and Industrial Control System.VME64x bus is chosen for timing system and fast protection system.PLCs and embedded industrial computers are used in the device layer slow controls.Control System Studio is adopted as the high-level applications.Blade server-based virtualization platform is deployed for the computer system.The accelerator control system was completed in September 2017 and then transited to routine operations.The design,implementation and operation of the accelerator control system are described in this paper. 展开更多
关键词 CSNS Accelerator control EPICS Machine protection system Run management system
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