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Payne Effect and Weak Overshoot in Rubber Nanocomposites

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Chinese Journal of Polymer Science 2022年第1期40卷 85-92页

作者： Zhi-Yun Li Yi-Hu Song qiang zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Payne effect and its associated weak overshoot are of importance for understanding and regulating the softening of rubber nanocomposites under large amplitude ***,Payne effect in diverse filled vulcanizates is investigated for generalizing the common *** curves of strain amplitude dependent storage modulus are created with respect to microscopic strain amplitude of the matrix,revealing a matrix-dominated elastic nonlinearity being independent of type and dispersity of filler,crosslinking density and sol fraction of matrix and filler-rubber interfacial ***,carbonaceous fillers with higher affinity to the rubber matrices yield lower strain amplification and higher overshoot behavior in comparison with siliceous *** investigation would be illuminating for preparing rubber nanocomposites with optimized reinforcement and softening performances.

关键词： Vulcanizate nanocomposites Payne effect Weak overshoot

Some New Exact Traveling Wave Solutions of Double-sine-Gordon Equation

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Communications in Theoretical Physics 2008年第2期49卷 303-304页

作者： zheng qiang REN Zhong-Zhou Department of Physics Nanjing University Nanjing 210093 China

The double-sine-Gordon equation is studied by means of the so-called mapping method. Some new exact solutions are determined.

关键词： double-sine-Gordon equation mapping method traveling wave solutions

Energy Scattering Theory for Electromagnetic NLS in Dimension Two

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Acta Mathematica Sinica,English Series 2018年第4期34卷 641-654页

作者： Jun Yong ZHANG Ji qiang zheng Department of Mathematics Beijing Institute of Technology Beijing 100081 P. R. China Beijing Computational Science Research Center Beijing 100193 P. R. China Department of Mathematics Universitd Nice Sophia-Antipolis 06108 Nice Cedex 02 France

We study the well-posedness and long-time behavior of solution to both defocusing and focusing nonlinear Schrodinger equations with scaling critical magnetic potentials in dimension two. In the defocusing case, and under the assumption that the initial data is radial, we prove interaction Morawetz-type inequalities and show the scattering holds in the energy space. The magnetic potential considered here is the Aharonov-Bohm potential which decays likely the Coulomb potential {x}-1.

关键词： Nonlinear Schrodinger equations Aharonov-Bohm potential global well-posedness scat-tering

Factors to consider in developing individual pharmaceutical product quality risk profiles useful to government procurement agencies

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Acta Pharmaceutica Sinica B 2016年第1期6卷 79-92页

作者： Wei Xu Garth Boehm qiang zheng School of Pharmaceutical Sciences Peking University Center for Pharmaceutical Information and Engineering Research Peking University Department of Industrial Engineering and Management College of EngineeringPeking University

Governments that procure pharmaceutical products from an Essential Medicine List(EML)bear special responsibility for the quality of these *** this article we examine the possibility of developing a pharmaceutical product quality risk assessment scheme for use by government procurement *** use the Chinese EML as a basis,and US recall data is examined as it is publically *** is justified as the article is only concerned with inherent product quality *** establishing a link between Chinese essential medicines and those available in the US,we examine US recall data to separate product specific *** conclude that,in addition to existing manufacturing based risks,there are two other product specific risks that stand out from all others,degradation and dissolution *** for relative product risk for degradation is needed to be developed and further work is required to better understand dissolution failures which largely occur with modified-release solid oral *** conclude that a product specific quality risk profile would be enhanced by including a risk assessment for degradation for all products,and in the case of solid oral products,dissolution.

关键词： Chinese essential medicine Product-specific quality risk Chemical stability Dissolution Risk assessment US recall data

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低温碳化法制备高分散性纳米碳酸钙的研究

人工晶体学报 2024年第5期53卷 864-872页

作者：邢佳斌李威贾松岩马亚丽李雪郑强沈阳化工大学化学工程学院沈阳110142 辽宁省镁钙无机功能材料工程研究中心沈阳110142 沈阳市镁钙资源利用技术重点实验室沈阳110142

以石灰石为原料,采用低温碳化法制备了高分散性纳米碳酸钙。通过XRD、SEM、TEM等对纳米碳酸钙样品进行表征,考察了浆料比、碳化温度、CO_(2)通气速率、陈化时间、晶型控制剂对纳米碳酸钙粒径和分散程度的影响。研究结果表明,制备纳米碳... 详细信息

以石灰石为原料,采用低温碳化法制备了高分散性纳米碳酸钙。通过XRD、SEM、TEM等对纳米碳酸钙样品进行表征,考察了浆料比、碳化温度、CO_(2)通气速率、陈化时间、晶型控制剂对纳米碳酸钙粒径和分散程度的影响。研究结果表明,制备纳米碳酸钙的最佳工艺条件为:浆料比为5%,碳化温度为15℃,CO_(2)通气速率为200 mL/min,陈化时间2 h,并选用ZnCl_(2)为添加剂。在此条件下,制得晶粒尺寸为25~35 nm、分布均匀的立方体状纳米碳酸钙。结合Materials Studio对纳米碳酸钙的生长机理进行了分析,结果表明:碳酸钙的(104)和(116)2个晶面具有热力学稳定性,最终会成为顽强显露的晶面,促使生成立方体型纳米碳酸钙。

关键词：石灰石纳米碳酸钙低温碳化法晶体生长生长机理晶型控制剂

风浪流耦合场下EIMD-斜拉桥的半主动控制方法

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西安工业大学学报 2024年第3期44卷 357-365页

作者：谢琛李志军郑强西安工业大学建筑工程学院西安710021

为了减少斜拉桥过大的振动响应,本文根据新型电磁惯性质量阻尼器的优点,以双塔双索面钢箱梁斜拉桥模型为算例,提出基于新型电磁惯性质量阻尼器斜拉桥半主动控制方法,并对其进行仿真分析,以主梁跨中节点的动力响应特性为控制目标,验证了... 详细信息

为了减少斜拉桥过大的振动响应,本文根据新型电磁惯性质量阻尼器的优点,以双塔双索面钢箱梁斜拉桥模型为算例,提出基于新型电磁惯性质量阻尼器斜拉桥半主动控制方法,并对其进行仿真分析,以主梁跨中节点的动力响应特性为控制目标,验证了文中方法的有效性。研究结果表明:相较于线性二次型调节器的主动控制方法,文中的半主动控制方法的斜拉桥位移控振率为77.3%,加速度控振率为64.3%,控制系统的外部能量需求有所降低,阻尼系数控制在由新型电磁惯性质量阻尼器提供的合理范围内,能实现更优的控制效果。文中方法可为斜拉桥在复杂环境下的系统控制提供理论参考。

关键词：大跨斜拉桥风浪流耦合作用电磁惯性质量阻尼器半主动控制

Understanding the Reinforcement and Dissipation of Natural Rubber Compounds Filled with Hybrid Filler Composed of Carbon Black and Silica

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Chinese Journal of Polymer Science 2017年第11期35卷 1436-1446页

作者：宋义虎 Ling-bin Zeng qiang zheng Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang ProvinceZhejiang University Shanghai Aerospace System Engineering Institute

The performance of reinforced rubber compounds depends on the filler composition while the reinforcement and dissipation mechanisms still remain unclear. Herein linear and nonlinear dynamic rheological responses of carbon black/silica hybrid filler filling nature rubber compounds are investigated. The rheological contributions of dynamically retarded bulk phase and filler network are revealed to be crucial at high and low frequencies, respectively, and the bulk phase is shown to be of vital importance for the occurrence of nonlinear Payne effect at mediate frequencies. A framework for simultaneously solving reinforcement and dissipation varying with filler composition and content is suggested, providing a new perspective in understanding the filling effect for manufacturing high-performance rubber materials.

关键词： Filling Reinforcement Dissipation Rubber compounds Time-concentration superpositioning principle

Mucin from Loach Skin Mucus and Its Interfacial Behavior on Gold Surface

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Chinese Journal of Polymer Science 2014年第10期32卷 1381-1389页

作者： Xiang Wang 杜淼宋义虎 qiang zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

Loach skin mucin was isolated from loach skin mucus and found to be similar to mammalian mucins in many aspects, i.e., low amino acid residue content, high molecular weight, presence of hydrophobic blocks and gel-forming characteristics in water. However, loach skin mucin can form a weak gel in water at a much lower concentration （3 mg/mL） than mammalian mucins, indicating its good hydrophilicity. Loach skin mucin can also form a stable adsorption layer on gold surface in aqueous environment, owing to the existence of hydrophobic blocks within mucin. The nature of high hydrophilicity and interfacial behavior give loach skin mucin potential as excellent material for use in solid-water interfaces for antifouling and lubrication, and should be crucial to the versatile functions of loach skin mucus.

关键词： Fish mucus Mucin Hydrophilicity Adsorption Interface.

Effects of Nanosilica on Crystallization and Thermal Ageing Behaviors of Polyethylene Terephthalate

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Chinese Journal of Polymer Science 2015年第5期33卷 697-708页

作者： Ying-jie Xu 宋义虎 qiang zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

The effects of nanosilica（SiO2） on crystallization and thermal aging behaviors of polyethylene terephthalate（PET） have been studied using differential scanning calorimetry（DSC） and polarized optical microscopy（POM）, viscometry, tensile testing and scanning electron microscopy（SEM）. For non-isothermal and isothermal crystallizations, the crystallization rate of PET increases considerably with increasing content of SiO2 providing a large number of nucleation sites, but the relative crystallinity of the nanocomposites has little differences with that of neat PET. According to POM observation, the nucleation of PET becomes faster and the nucleation density increases significantly with increasing SiO2 content. For PET and its nanocomposites thermally aged at 190 ℃, the results of intrinsic viscosity, carboxyl content and tensile test show that the degradation rate of PET is reduced with the addition of a small content of SiO2, but the degradation rate increases with further addition of SiO2, owing to the dual effect of SiO2 on PET degradation.

关键词： Polyethylene terephthalate Nanosilica Crystallization Thermal ageing