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How the Aggregates Determine Bound Rubber Models in Silicone Rubber? A Contrast Matching Neutron Scattering Study

Chinese Journal of Polymer Science 2021年第3期39卷 365-376,I0007页

作者： Li-Zhao Huang Yue Shui Wei Chen Zhong-Ming Li Hong-Tao Song Guang-Ai Sun Jia-Zhuang Xu Gan-Ji Zhong Dong Liu Key Laboratory of Neutron Physics and Institute of Nucear Physics and Chemistry(NPC) China Academy of Engineeing Physict(CAEP)Mcnyang 621999China National Synchrotron Radiation Lab CAS Key Laboratory of soft Mtter Chemisty Anhui Provincial fngineing Laboratory of Advanced funcionad Poymer FilmUniversity of Science and Technology of ChinaHefei 230026China College of Polymer cience and Engineering state Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 61065China

The correlation between aggregates and bound rubber structures in silicone rubbers(S(phr)) with various silica fractions(ΦSi) has been investigated by contrast matching small-angle neutron scattering(SANS), swelling kinetics, and low-field nuclear magnetic resonance(NMR).Mixed solvents with deuterated cyclohexane fractions of 4.9% and 53.7% were chosen to match the scattering length densities of the matrix(SMP(phr)) and the filler(SMS(phr)), respectively. All the data consistently suggest that:(i) There is a critical threshold ΦSic between 10 and 30 phr;below ΦSic, the isolated aggregates are dominant, while beyond ΦSic, some rubber fraction is trapped among the agglomerate;(ii) ΦSiindependent thicknesses around 7.5 nm(NMR) and 8.6 nm(SANS) suggest that the bound rubber formation is determined by inherent properties of the components, and the power-law around 4.2 suggests an exponential changed gradient density of the bound rubber;(iii) SMS(80) presents a bicontinuous bound rubber with three characteristic lengths of 41, 100, and 234 nm. The expanded correlation length, a 20 nm smaller aggregate sizes suggest that such existent bicontinuous network in dry samples with less ΦSi is kind of impacted by swelling. With the obtained bound rubber models, the reinforcing mechanism of filled silicone rubber is elucidated.

关键词： Silicone rubber Bound rubber structures Small-angle neutron scattering(SANS) Nuclear magnetic resonance(NMR)

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Experimental Study on Flow and Heat Transfer of Medium-Prandtl-Number Fluid Along a Hexagonal Helical Cruciform Seven-Rods

SSRN

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SSRN 2023年

作者： Jiang, Dianqiang Zhang, Dalin Tian, Wenxi Qiu, Suizheng Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China

A novel type of nuclear fuel named helical cruciform fuel may realize self-supporting for adjacent elements and improve heat transfer, both of which contribute to increasing the power density of the reactor. The flow and heat transfer characteristics of a hexagonal helical cruciform seven-rod bundle were experimentally investigated in the present work. 200 sets of isothermal frictional resistance experiments and 199 sets of heat transfer experiments were finished. The laminar flow region (200 © 2023, The Authors. All rights reserved.

关键词： Reynolds number

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Robust Approximation-Based Event-Triggered MPC for Constrained Sampled-Data Systems

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Journal of Systems Science & Complexity 2021年第6期34卷 2109-2124页

作者： WANG Tao KANG Yu LI Pengfei ZHAO Yun-Bo YU Peilong Department of Automation University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230027China Institute of Advanced Technology University of Science and Technology of ChinaHefei 230027China College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China

In this paper,an approximation-based event-triggered model predictive control(AETMPC)strategy is proposed to implement event-triggered model predictive control for continuous-time constrained nonlinear systems under the digital *** the AETMPC strategy,both of the optimal control problem(OCP)and the triggering conditions are defined in a discrete-time manner based on approximate discrete-time models,while the plant under control is continuous *** doing so,sensing load is alleviated because the triggering condition does not need to be checked continuously,and the computation of the OCP is simpler since which is calculated in the discrete-time ***,robust constraints are satisfied in a continuous-time sense by taking inter-sampling behavior into consideration,and a novel constraint tightening approach is presented ***,the feasibility of the AETMPC strategy is analyzed and the associated stability of the overall system is ***,this strategy is validated by a numerical example.

关键词： Approximations event-triggered control model predictive control sampled-data systems

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Study on the Safety Characteristics of Fluoride-Salt-Cooled High-Temperature advanced Reactor

SSRN

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SSRN 2023年

作者： Lv, Xindi Zhang, Dalin Li, Xinyu Zhou, Xingguang Jiang, Dianqiang Su, Guanghui Tian, Wenxi Qiu, Suizheng State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China

FuSTAR is a small, modular fluoride-salt-cooled high-temperature advanced reactor, proposed by Xi'an Jiaotong University (XJTU), aiming at fulfilling the requirements of Gen IV nuclear system and meanwhile ensuring the inherent safety and economics. In order to evaluate the safety performance of FuSTAR, five typical design basis accidents are selected for safety analysis with different initial events. The sensitivity analysis is also performed. The results of transient accidents indicate that safety of FuSTAR has been guaranteed in URIA and ULOF. Meanwhile, the maximum limit of external parameters causing ULOHS and UOC are obtained by sensitivity analysis. In the ULOF and ULOHS, the peak of fuel temperature, cladding surface temperature and core outlet temperature of coolant are below their safety limits. Therefore, FuSTAR exhibits acceptable safety under design basis accidents. This study will provide supports in verifying the rationality of the design and the subsequent optimization of FuSTAR. © 2023, The Authors. All rights reserved.

关键词： Sensitivity analysis

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Nanocluster PtNiP supported on graphene as an efficient electrocatalyst for methanol oxidation reaction

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Nano Research 2021年第8期14卷 2853-2860页

作者： Long Yang Guoqiang Li Rongpeng Ma Shuai Hou Jinfa Chang Mingbo Ruan Wenbin Cai Zhao Jin Weilin Xu Guiling Wang Junjie Ge Changpeng Liu Wei Xing Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Electroanalytical Chemistry Laboratory of Advanced Power SourcesChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy MaterialsDepartment of ChemistryFudan UniversityShanghai 200433China

In this study,phosphorus doped graphene supported PtNiP nanocluster electrocatalyst(PtNiP/P-graphene)was successfully prepared via a simple hypophosphite-assisted co-reduction *** improved anchoring force and increased anchoring sites of graphene support result from phosphorus doping as well as size-confined growth effect of NaH_(2)PO_(2) leads to uniform dispersion of ultrafine PtNiP *** P also promotes the removal of CO-like intermediate by adjusting Pt electronic structure combining with alloyed Ni via electronic *** a result,the as-prepared PtNiP/P-graphene catalyst with more exposed active sites and optimized electronic structure of Pt alloy shows excellent electrocatalytic performances for methanol oxidation reaction(MOR)both in activity and durability in an acidic medium.

关键词： nanocluster PtNiP/P-graphene uniformly disperse phosphorus doping methanol electrochemical oxidation

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PtNi-W/C with Atomically Dispersed Tungsten Sites Toward Boosted ORR in Proton Exchange Membrane Fuel Cell Devices

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Nano-Micro Letters 2023年第9期15卷 238-256页

作者： Huawei Wang Jialong Gao Changli Chen Wei Zhao Zihou Zhang Dong Li Ying Chen Chenyue Wang Cheng Zhu Xiaoxing Ke Jiajing Pei Juncai Dong Qi Chen Haibo Jin Maorong Chai Yujing Li Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China State Power Investment Corporation Hydrogen Energy Company LimitedBeijing 102209People’s Republic of China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124People’s Republic of China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049People’s Republic of China

The performance of proton exchange membrane fuel cells is heavily dependent on the microstructure of electrode catalyst especially at low catalyst *** work shows a hybrid electrocatalyst consisting of PtNi-W alloy nanocrystals loaded on carbon surface with atomically dispersed W sites by a two-step straightforward ***-atomic W can be found on the carbon surface,which can form protonic acid sites and establish an extended proton transport network at the catalyst *** implemented in membrane electrode assembly as cathode at ultra-low loading of 0.05 mgPt cm^(−2),the peak power density of the cell is enhanced by 64.4%compared to that with the commercial Pt/C *** theoretical calculation suggests that the single-atomic W possesses a favorable energetics toward the formation of*OOH whereby the intermediates can be efficiently converted and further reduced to water,revealing a interfacial cascade catalysis facilitated by the single-atomic *** work highlights a novel functional hybrid electrocatalyst design from the atomic level that enables to solve the bottle-neck issues at device level.

关键词： Fuel cells Membrane electrode assembly PGM catalyst Synergistic catalysis Oxygen reduction

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Design,Characterization and Optimization of Multi-directional Bending Pneumatic Artificial Muscles

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Journal of Bionic engineering 2021年第6期18卷 1358-1368页

作者： Wei Xiao Dean Hu Weixiong Chen Gang Yang Xu Han State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082People’s Republic of China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of EducationHunan UniversityChangsha410082People’s Republic of China School of Mechanical Engineering Hebei University of TechnologyTianjin300401People’s Republic of China

Bending Pneumatic Artificial Muscles(PAMs)are particularly attractive and extensively applied to the soft grasper,snake-like robot,*** extend the application of PAMs,we fabricate a Multi-directional Bending Pneumatic Artificial Muscle(MBPAM)that can bend in eight directions by changing the pressurized *** maximum bending angle and output force are 151°and 0.643 N under the pressure of 100 kPa,***,the Finite Element Model(FEM)is established to further investigate the *** experimental and numerical results demonstrate the nonlinear relationship between the pressure and the bending angle and output ***,the effects of parameters on the performance are studied with the validated *** results reveal that the amplitude of waves and the thickness of the base layer can be ***,multi-objective optimization is performed to improve the bending performance of the *** optimization results indicate that the output force can be increased by 7.8%with the identical bending angle of the initial design,while the bending angle can be improved by 8.6%with the same output ***,the grasp tests demonstrate the grip capability of the soft four-finger gripper and display the application prospect of the MBPAM in soft robots.

关键词： Pneumatic artificial muscle Multi-directional bending Soft robots Parameter optimization

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pH-dependent formation potential of OH∗ on Pt(111): Double layer effect on water dissociation

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Nano Materials Science 2024年

作者： Wang, Xue Zhu, Jia-Xin Kuang, Yongbo Cheng, Jun Le, Jia-Bo Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China State Key Laboratory of Physical Chemistry of Solid Surfaces iChEM College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China Xiamen361100 China

The adsorption/desorption of OH∗ on electrode surfaces is pivotal in numerous electrocatalytic reactions. To understand the effect of electrolyte pH on that process, in this work, an advanced approach combining ab initio molecular dynamics (AIMD) with free energy perturbation is employed to calculate the dehydrogenation free energy of water chemisorbed at differently electrified Pt(111)/electrolyte interfaces. Our findings reveal that the onset potential for OH∗ formation shifts negatively as the pH increases at low pH condition (pH− oxidation emerges as the primary route for OH∗ adsorption on Pt(111) constrained by the water chemisorption process. This work provides crucial insights into the pH-dependent adsorption behavior of OH∗ on the Pt(111) surface and aims to guide the optimization of electrolytes to boost the efficiency of related reactions. © 2024 Chongqing University

关键词： Molecular dynamics

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Exploiting the donor-acceptor-additive interaction’s morphological effect on the performance of organic solar cells

Aggregate

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Aggregate 2024年第2期5卷 316-327页

作者： Lu Chen Ruijie Ma Jicheng Yi Top Archie Dela Peña Hongxiang Li Qi Wei Cenqi Yan Jiaying Wu Mingjie Li Pei Cheng He Yan Guangye Zhang Gang Li College of New Materials and New Energies Shenzhen Technology UniversityShenzhenChina Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and TechnologyHong KongChina Department of Electrical and Electronic Engineering Research Institute for Smart Energy(RISE)Photonic Research Institute(PRI)The Hong Kong Polytechnic UniversityHong KongChina Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina The Hong Kong University of Science and Technology Function HubAdvanced Materials ThrustGuangzhouP.R.China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengduChina

Organic solar cells(OSCs)have demonstrated over 19%power conversion efficiency(PCE)with the help of material innovation and device ***-working with newly designed materials,traditional solvent additives,1-chloronaphthalene(CN),and 1,8-diodooctane(DIO)are still powerful in morphology modulation towards satisfying ***,we chose recently reported high-performance polymer donors(PM6&D18-Fu)and small molecular acceptors(Y6&L8-BO)as active layer materials and processed them by different conditions(CN or DIO or none).Based on corresponding 12 groups of device results,and their film morphology characterizations(both ex-situ and in-situ ones),the property-performance relationships are revealed case by *** is thereby supposed to be taken as a successful attempt to demonstrate the importance and complexity of donor-acceptoradditive interaction,since the device performance and physics analyses are also tightly combined with morphology ***,ternary blend construction for PCE improvement provides an approaching 19%level and showcases the potential of understanding-guided-optimization(UGO)in the future of OSCs.

关键词： material combinations morphology modulation organic solar cells power conversion efficiency solvent additives

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Comparison and Optimization of Biomass-Derived Hard Carbon as Anode Materials for Sodium-Ion Batteries

SSRN

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SSRN 2024年

作者： Kuai, J. Xie, Jian Wang, J.D. Chen, J.Y. Liu, F. Xu, Xiongwen Tu, Jian Cheng, Jipeng State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Zhejiang University Hangzhou310027 China LI-FUN Technology Corporation limited Zhuzhou412000 China

In this work, three different hard carbon materials from bamboo, wood and coconut shell with the same particle size are screened. The anode material originated from bamboo shows the highest specific capacity among them. Subsequently, the hard carbon from bamboo is optimized by the same process at carbonization temperature ranging from 1000 °C to 1400 °C. Among hard carbon materials, the bamboo-derived hard carbon prepared at 1300 ℃ shows a high reversible specific capacity of 303.8 mAh g−1 and an initial coulombic efficiency of 83.7 %. After 150 cycles, a capacity retention of 94.7% is remained at 300 mA g−1. © 2024, The Authors. All rights reserved.

关键词： Sodium-ion batteries

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