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Examination of an isospin-dependent single-nucleon momentum distribution for isospin-asymmetric nuclear matter in heavy-ion collisions

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Nuclear Science and Techniques 2020年第7期31卷 85-95页

作者： Gao-Feng Wei Qi-Jun zhi Xin-Wei Cao Zheng-wen long School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550025China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal UniversityGuiyang 550025China School of Mechanical and Material Engineering Xi’an University of Arts and SciencesXi’an 710065China College of Physics Guizhou UniversityGuiyang 550025China

Within a transport model using nucleon momentum profiles as the input from a parameterized isospin-dependent single-nucleon momentum distribution,with a high momentum tail induced by short-range correlations,we employ197 Au+197 Au collisions at 400 MeV/nucleon to examine the effects of the short-range correlations on the pion and flow observables in probing the nuclear symmetry *** investigate how reliable this isospin-dependent single-nucleon momentum distribution is and determine the corresponding parameter *** from the significant effects of the short-range correlations on the pion and flow observables that are observed,we also find that the theoretical simulations of the197 Au+197 Au collisions with this momentum distribution using two sets of parameters,extracted from the experimental analysis and the self-consistent Green’s function prediction,can reproduce the neutron ellipticflows of the FOPI-LAND experiment and the pà=ptratios of the FOPI experiment,respectively,under the symmetry energy setting in a particular ***,we conclude that this parameterized isospin-dependent single-nucleon momentum distribution is reliable for isospin-asymmetric nuclear ***,two sets of parameters extracted from both the experimental analysis and the selfconsistent Green’s function prediction cannot be excluded according to the available experimental information at present.

关键词： momentum distribution asymmetric

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Observation and simulation of wind waves near a typical reef lagoon in South China Sea

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Journal of Hydrodynamics 2021年第1期33卷 24-32页

作者： Ze Sun Dao-lin Xu Xiao-long Liu Hai-cheng Zhang zhi-wen Cai China Ship Scientific Research Center Wuxi 214082China Centre for Marine Technology Hunan UniversityChangsha 410082China Southern Marine Science and Engineering Guangdong Laboratory Zhanjiang 524025China

Due to the inference of the uneven shallow water seabed and the surrounding islands,the wind-generated waves around or in a reef lagoon are rather complicated,and critical to the safety of floating structures deployed near islands or inside a *** paper aims to find a feasible analysis tool for the wave simulations near islands and *** proposed three methods of grid techniques of WAVEWATCH III(WW3)are assessed by using on-site measured data which was collected and accumulated for about 5 years since August 2014 by a wave observation system deployed inside and outside a reef lagoon in South China *** the assessments,the wave statistics including the correlation coefficients,root mean square errors,and their variances are used to quantify the precisions of the simulation results of the significant wave heights,mean wave periods,and peak wave directions at two *** the three methods,the Multi-scale Zone and Multi-scale grid Technique(MZMGT)established on unstructured triangular grids exhibits better results in terms of the accuracy and CPU *** addition,the bimodal feature of wave spectra was observed at both sites of the reef lagoon in different typhoon *** wave characteristics inside the reef lagoon and open sea are also analyzed.

关键词： Wave simulation reef lagoon WAVEWATCH III(WW3) grid methods typhoon waves on-site measurements

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Novel cemented carbide produced with TiN_(0.3) and high-entropy alloys

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Rare Metals 2017年第6期36卷 494-500页

作者： Zhan-wen He Ming-zhi Wang Xue-long Hao Qin Zou Yu-Cheng Zhao State Key Laboratory of Metastable Materials Science and Technology Yanshan University National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials General Research Institute for Nonferrous Metals

High-entropy alloys are suitable for use as a binder for cemented carbides duo to outstanding mechanical, oxidation and wear behavior. Therefore, high-entropy alloy was selected to replace Co and Ni metal bond in this study. The results of X-ray diffraction analysis show that CoCrNiCuMn high-entropy alloy is stabilized in the cemented carbide system. Scanning electron microscope（SEM） fractural morphologies of the cemented carbides added with CoCrNiCuMn show that CoCrNiCuMn distributes in grain boundaries, and the grains are bound tightly together. Furthermore, SEM fractural morphologies of the cemented carbides with 5 wt%, 7 wt%, and 10 wt% CoCrNiCuMn show that CoCrNiCuMn slows the growth of grains, which effectively binders the grains, prevents the generation and propagation of cracks, and finally, greatly improves the toughness of the cemented *** to the results observed in the cemented carbides containing different amounts of CoCrNiCuMn, the hardness level gradually increases with the amount of CoCrNiCuMn; however, a reverse trend is seen in the toughness level. The cemented carbide with 10 wt% CoCrNiCuMn shows the highest toughness value of 7.05 MPa·m^1/2.

关键词： High-entropy alloy, Cemented carbide Nonstoichiometric TiN0.3

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青海沱沱河地区扎拉夏格涌粗面岩锆石U-Pb年代学及地球化学特征

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世界地质 2016年第4期35卷 920-930页

作者：宁传奇李碧乐王斌王国志杨文龙吉林大学地球科学学院长春130061 河北地勘局第五地质大队河北唐山063004

对青海沱沱河地区扎拉夏格涌粗面岩进行U--Pb年代学和地球化学特征研究,结果表明：扎拉夏格涌粗面岩锆石U--Pb年龄为32.39-34.06 Ma,加权平均年龄为（33.09±0.26）Ma,形成时代为渐新世;岩石属于高硅高钾准铝质-过铝质钾玄岩系列。稀土... 详细信息

对青海沱沱河地区扎拉夏格涌粗面岩进行U--Pb年代学和地球化学特征研究,结果表明：扎拉夏格涌粗面岩锆石U--Pb年龄为32.39-34.06 Ma,加权平均年龄为（33.09±0.26）Ma,形成时代为渐新世;岩石属于高硅高钾准铝质-过铝质钾玄岩系列。稀土元素配分模式图呈右倾型,轻重稀土元素分馏明显[（La/Yb）N=19.96-34.00,平均值26.99],弱铕正异常（δEu=1.00-1.20,平均值1.08）;样品富集大离子亲石元素（LILE：Rb,Ba,K）,亏损高场强元素（HFSE：Nb,Ta,P,Ti）,高场强元素Zr,Th较富集。岩石具有C型埃达克岩特征,为新生镁铁质下地壳部分熔融产物。通过区域对比和总结前人研究成果,认为扎拉夏格涌粗面岩形成于新生代早期造山加厚之后的伸展阶段。

关键词：青海沱沱河地区扎拉夏格涌粗面岩锆石U-Pb年龄年代学地球化学

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Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities

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Frontiers of Chemical Science and Engineering 2022年第11期16卷 1672-1680页

作者： Hai-long Liao Lan Jiang Hai-Xin Yu zhi-Hao Liu Ji-wen Fu Guang-wen Chu Yong Luo State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Droplet impacting on the stainless steel wire mesh is very common in chemical devices,like a rotating packed *** wettability of wire mesh significantly affects the liquid flow pattern and liquid dispersion ***,the effect of surface wettability on the impaction phenomena at microscale such as liquid film is still *** this work,the dynamic behavior of liquid film on the surface of wire mesh was analyzed by computational fluid dynamics *** dynamic behavior of liquid film on the surface of wire mesh can be divided into the following three steps:(1)spreading step;(2)shrinkage process;(3)stabilizing or disappearing *** of surface wettability,as well as operating conditions,on wetting area and liquid film thickness were *** to the hydrophilic wire mesh,the final wetting area of hydrophobic wire mesh is zero in most *** average liquid film thickness on the surface of hydrophilic wire mesh is 30.02–77.29μm,and that of hydrophobic wire mesh is 41.76–237.37μ*** work provided a basic understanding of liquid film flow at microscale on the surface with various surface wettabilities,which can be guiding the packing optimization and design.

关键词： stainless steel wire mesh computational fluid dynamics surface wettability liquid film impacting

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Highly efficient regioselective ring openings of N-tosylaziridines to haloamines using ferric(Ⅲ) halides

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Chinese Chemical Letters 2014年第8期25卷 1174-1178页

作者： Xing Li zhi-Qin Sun Hong-Hong Chang wen-long Wei Department of Chemistry and Chemical Engineering Taiyuan University of Technology

FeX3（X = Cl, Br） were found to be very effective reagents and powerful catalysts for regioselective ring openings of a variety of N-tosylaziridines with them to afford the corresponding b-haloamines in good to excellent yields with high regioselectivity under mild conditions. At the same time, 13 new compounds were obtained firstly. Moreover, the b-bromoamine prepared could be transferred into b-nitroamine with NaNO2 in moderate yield.

关键词： Ring-opening N-Tosylaziridine Haloamine Ferric (Ⅲ) halide Regioselectivity

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Mountain pass solutions to a generalized Frenkel-Kontorova model

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Science China Mathematics 2022年第6期65卷 1293-1318页

作者： wen-long Li School of Mathematics Sun Yat-Sen UniversityGuangzhou 510275China

We study a generalized Frenkel-Kontorova model and obtain periodic and heteroclinic mountain pass *** heteroclinic mountain pass solution in the second laminations is new to the generalized Frenkel-Kontorova *** proof follows that of Bolotin and Rabinowitz(2005)for an Allen-Cahn equation,which is different from the heat flow method of finding the critical point of the Frenkel-Kontorova model in the *** proofs depend on suitable choices of functionals and working *** also study the multiplicity of these mountain pass solutions.

关键词： mountain pass solution periodic solution heteroclinic solution Frenkel-Kontorova model

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Biomimetic Cilia Based on MEMS Technology

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Journal of Bionic Engineering 2008年第4期5卷 358-365页

作者： zhi-guo Zhou zhi-wen Liu Department of Electronic Engineering Beijing Institute of Technology Beijing 100081 P. R. China

A review on the research of Micro Electromechanical Systems （MEMS） technology based biomimetic cilia is presented. Biomimetic cilia, enabled by the advancement of MEMS technology, have been under dynamic development for the past decade. After a brief description of the background of cilia and MEMS technology, different biomimetic cilia applications are reviewed. Biomimetic cilia micro-actuators, including micromachined polyimide bimorph biomimetic cilia micro-actuator, electro-statically actuated polymer biomimetic cilia micro-actuator, and magnetically actuated nanorod array biomimetic cilia micro-actuator, are presented. Subsequently micromachined underwater flow biomimetic cilia micro-sensor is studied, followed by acoustic flow micro-sensor. The fabrication of these MEMS-based biomimetic cilia devices, characterization of their physical properties, and the results of their application experiments are discussed.

关键词： biomimetic cilia MEMS micro-actuator micro-sensor

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Retrofitting low-performance units to abate sewer overflow pollution based on mathematical model and Sobol algorithm

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Journal of Hydrodynamics 2023年第4期35卷 770-781页

作者： zhi-chao Zhao Xiao-min Huang Hai-long Yin Jun-bo wen Xiao-wei Fu Changjiang Institute of Survey PlanningDesign and ResearchWuhan430010China Key Laboratory of Yangtze River Water Environment Ministry of EducationTongji UniversityShanghai200092China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai200092China Hubei Provincial Engineering Research Center for Comprehensive Water Environment Treatment in the Yangtze River Basin Wuhan430010China Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water ResourcesShanghai200092China

Optimal retrofit of low-performance units(LPUs)is promising to abate overflow pollutant mass loading of sewer systems during *** study presents a combination of mathematical model and Sobol algorithm to help identify LPUs of sewer systems and design retrofitting ***,the solution to minimize the overflow pollutant mass loading from sewers systems can be efficiently *** developed method was demonstrated at a catchment served by one wastewater treatment plant in the Chaohu City,Anhui Province of China,with five pumping stations and a total sewer length of 58.3 *** the catchment,there are three rivers and a small lake to receive overflows from the sewer *** them,one river that was mostly polluted was selected as the object of overflow pollution abatement during wet weather *** identifying the LPUs of the sewer system and developing retrofitting strategies using Sobol sequence,the mitigation of overflow pollution during wet weather period was *** show that the mass loading of chemical oxygen demand(COD)discharged into the target river could be reduced by 40.6%,by implementing optimal retrofit strategy of LPUs,i.e.,increasing the conveyance capacities of two pumping stations by 2.5–3.2 times and augmenting the diameters of 12 sewers by 1.25–1.29 *** further coordinate the abatement of overflow pollution and retrofit investment,Sobol sensitivity analysis was conducted to screen the dominant LPUs to update the optimal retrofit *** applying the updated strategy,the overflow COD mass loading per overflow event was close to that of non-updated strategy,while the retrofitting length of sewers was reduced by 40%.Therefore,on the basis of the presented method,decision-makers can flexibly develop retrofitting strategies of sewer system to abate overflow pollution during wet weathers in a cost-effective way.

关键词： Urban sewer system low-performance units Sobol sensitivity analysis sewer overflow optimal retrofit strategy

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Conformational Behavior of Single Circular Semiflexible Polyelectrolyte in the Presence of Multivalent Counterions

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Chinese Journal of Polymer Science 2023年第3期41卷 448-458,I0010页

作者： zhi-Yong Yang wen-long Lin Ai-Hua Chai Dan Lu Nian-Qian Kang Lin-Xi Zhang Department of Physics Jiangxi Agricultural UniversityNanchang 330045China Lucheng College Wenzhou PolytechnicWenzhou 325006China College of data science Jiaxing UniversityJiaxing 314001China Department of Physics Zhejiang UniversityHangzhou 310027China

Langevin dynamics simulations are employed to explore the effects of chain stiffness and electrostatic interaction(EI) on the conformational behavior of a circular semiflexible polyelectrolyte(CSPE) in presence of trivalent *** investigate the effect of bending energy b and the dimensionless Bjerrum length A on the conformational behavior of the CSPE with a fixed chain *** competition among the EIs,chain stiffness and entropy of the system leads to rich conformations for the *** the b is less than or equal to 50,The shape of the CSPE changes from a oblate ring to a rod at small A,then to a toroid at intermediate A,and finally to a globule at very large ***,the globular conformation is not observed for large *** addition,we find that the number of torus ring increases with A increase,while decreases with b *** study should be helpful in gaining insight into the conformational behaviour of charged biopolymer.

关键词： Langevin dynamics simulation Circular semiflexible polyelectrolyte Trivalent counterions Electrostatic interaction

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