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Two-Pion Interferometry for the Granular Sources in Ultrarelativistic Heavy Ion Collisions at the RHIC and the LHC

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Chinese Physics Letters 2011年第12期28卷 96-99页

作者： ZHANG Wei-Ning YIN Hong-jie ren Yan-yu School of Physics and Optoelectronic Technology Dalian University of TechnologyDalian 116024 Department of Physics Harbin Institute of TechnologyHarbin 150006

We investigate the two-pion interferometry in ultrarelativistic heavy ion collisions in the granular source model of quark-gluon plasma *** pion transverse momentum spectra and HBT radii of the granular sources agree well with the experimental data of the most central Au-Au collisions at(sNN)1/2=200 GeV at the RHIC and Pb−Pb collisions at(sNN)1/2=2.76 TeV at the *** the granular source model the larger initial system breakup time for the LHC collisions as compared to the RHIC collisions may lead to the larger HBT radii Rout,Rside and ***,the large droplet transverse expansion and limited average relative emitting time of particles in the granular source lead to slightly smaller ratios of the transverse Hanbury–Brown–Twiss radii Rout/Rside.

关键词： transverse radii slightly

Design and evaluation of window management operations in AR headset+smartphone interface

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Virtual Reality & Intelligent Hardware 2022年第2期4卷 115-131页

作者： jie ren Chun yu yueting WENG Chengchi ZHOU yuanchun SHI Department of computer science and technology University of TsinghuaBeijing 100084China

Background The combination of an augmented reality(AR)headset and a smartphone can simultaneously provide a wider display and a precise touch input;it can redefine the way we use applications ***,users are deprived of such benefits owing to the independence of the two *** is a lack of intuitive and direct interactions between *** In this study,we conduct a formative investigation to understand the window management requirements and interaction preferences of using an AR headset and a smartphone simultaneously and report the insights we *** addition,we introduce an example vocabulary of window management operations in the AR headset and smartphone *** This allows users to manipulate windows in a virtual space and shift windows between devices efficiently and seamlessly.

关键词： Augmented reality Smartphone Window management User study Interaction

Synthesis and Langmuir-Blodgett Film Analysis of Atropisomers of “Picket Fence” Porphyrin

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Chemical Research in Chinese Universities 2010年第5期26卷 761-767页

作者： WANG Chao-wei ren yu-jie CAO Zhen-feng CHEN Qi-bin School of Chemistry and Environmental Engineering Shanghai Institute of Technology Shanghai 200235 P. R. China School of Chemistry ＆ Molecular Engineering East China University of Science and Technology Shanghai 200237 P. R. China

Four ＂picket fence＂ porphyrin atropisomers were respectively synthesized from the four corresponding atropisomers of meso-tetra（o-aminophenyl）porphyrin that had been chromatographed on a column eluted with petroleum ether and ethyl acetate. Results show that each atropisomer could be successfully synthesized by controlling the acylation temperature at 0 ℃. They were characterized by 1H NMR, HRMS, IR, UV-Vis and Langmuir-Blodgett（LB） film analyses. Although the results of HRMS, IR, UV-Vis analyses indicate there is no remarkable difference among the atropisomers, the results of the 1H NMR and the mean molecular areas obtained by LB film technique imply that the atropisomers are significantly discrepant. The former shows that the chemical shifts of the methyl and amide protons of each atropisomer are distinct, while the later presents that the different atropisomer molecules can occupy the different surface areas at the air/water interface.

关键词： "Picket fence" porphyrin Atropisomer Langmuir-Blodgett(LB) film meso-Tetra(o-pivalamidophenyl)porphyrin

Development of Steel Slag-Based Solidification/Stabilization Materials for High Moisture Content Soil

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Journal of renewable Materials 2022年第3期10卷 735-749页

作者： yu Jia Sudong Hua Liying Qian Xiaojian ren jie Zuo Yanfang Zhang College of Materials Science and Engineering Nanjing Tech UniversityNanjing210009China Jangsu Yonggang Group Co. Ltd.Suzhou215628China China Construction Installaction Engineering Co. Ltd.Nanjing210023China

To solve the problems of high moisture content,high viscosity,and poor engineering mechanical properties of soil,this paper using with steel slag(SS)and desulfurization ash(DS)as initial raw materials,realizing the coop-erative treatment of solid waste and solidification of silt *** synergistic utilization of SS and DS can reduce the production cost of curing agent and promote its own *** to blended cement of various SS contents and inspected compressive strength performances,the most suitable raw materials ratio was *** best formula for this curing agent is cement:steel slag=3:7 with 5%DS,and its 28-day compressive strength can reach 30 *** experiment shows that the effect of DS and Na_(2)SO_(4) reagent with the same quality on early compressive strength improvement of cement and SS system is not much *** this study,the mineral composition and microstructure of different gel system blocks were characterized by XRD,SEM and EDX,and a large number of webbed structures were found in the SEM test,which was not seen in previous ***,unconfined compressive strength(UCS),water resistance,and toxic characteristic leaching procedure(TCLP)were used to evaluate silt solidified soil *** results demonstrated that the solidified silt could meet not only the standard of general subgrade;but also has a partial stabilization effect of heavy metal ions.

关键词： Steel slag desulfurization ash high moisture content soil synergistic effect strength stabilized soil

Influence of Erosion Induced by NaCl on the Mechanical Performances of Alkali-Activated Mineral Admixtures

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Fluid Dynamics & Materials Processing 2023年第9期19卷 2385-2398页

作者： Jing yu jie ren Guangming Shen Weixiang Sun Hui Wang Department of Architectural Engineering Ningbo PolytechnicNingbo315000China Technology and Performance Management Department China Construction Infrastructure Corp.Ltd.Beijing10029China Chief Engineer’s Office Jiuzhou Engineering Design Co.Ltd.Zhengzhou451162China School of Civil Engineering and Geographic Environment Ningbo UniversityNingbo315000China

In this paper,the inﬂuence of NaCl freeze-thaw(F-T)cycles and dry-wet(D-W)alternations on theﬂexural,com-pressive and bonding strengths of alkali-activatedﬂy ash(FA)and a blast furnace slag powder(BFS)is *** considered NaCl concentration is 3%.The effect of polypropyleneﬁbers on the mechanical strengths is also *** electron microscopy(SEM),thermogravimetry(TG)and X-ray diffraction(XRD)are selected to discern the mechanisms underpinning the NaCl-induced *** obtained results indicate that the best results in terms of material resistance are obtained with admixtures containing 60%BFS and 40%FA in terms of mass ratio and 3%polypropyleneﬁbers in terms of volume *** maximum rates of decrease of theﬂexural,compressive and bonding strengths after 300 NaCl F-T cycles are 21.5%,20.3%and 22.6%,*** corresponding rates of decrease due to NaCl D-W alternations are 28.1%,26.1%and 31.5%,*** TG curves show that the alkali-activating activity of BFS is higher than that of ***,in theﬁrst case,the microstructure of the hydration products is more *** results also show that NaCl F-T cycles lead to increasing cracks in the alkali-activated BFS.

关键词： Mechanical performances alkali-activated NaCl dry-wet alternations NaCl freeze-thaw cycles microstructure

Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

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Tungsten 2025年第1期 71-79页

作者： Ruo-Hang Xu Hao-yu Jiang Dan-Dan Cui Kun-Rong Du Hong-Run Zhang Sheng-jie Xu Ya-Qi Li Zhi-Zhen ren Liang Wang Wei-Chang Hao Yi Du School of Physics and BUAA-UOW Joint Research Centre Beihang University Shenzhen Institute of Beihang University Centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1·h-1under full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

关键词：

WALL EFFECTS ON FLOWS PAST TWO TANDEM CYLINDERS OF DIFFErenT DIAMETERS

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Journal of Hydrodynamics 2012年第1期24卷 1-10页

作者： JIANG ren-jie LIN Jian-zhong State Key Laboratory of Fluid Power Transmission and Control Zhejiang UniversityHangzhou 310027China China Jiliang University Hangzhou 310018China

Flows past two tandem cylinders of different diameters placed centrally in a channel with fixed centre-to-centre spacing 6D and diameter ratio are simulated based on the Lattice Boltzmann Method（LBM）.In all the simulations,the diameter of the smaller cylinder is chosen as the characteristic *** Reynolds number based on the average inflow velocity is 20-120 and studies are over the range of blockage ratio *** both Small-Big Arrangement（SBA）and Big-Small Arrangement（BSA）,the effects of the channel width and Reynolds number on the flow structures and force coefficients are *** show that the flows in BSA are more regular than those in SBA for the same flow *** BSA with and,the force coefficients all fluctuate with constant amplitudes and a coupled frequency,the coupled frequency becomes small as the blockage ratio decreases and by an exact test we give out the relation of the blockage ratio and Strouhal *** the blockage ratio decreases to 2,there exist pitchfork bifurcations in both SBA and BSA,and results show that the critical Reynolds numbers of pitchfork bifurcations for SBA and BSA are both between 60 and *** SBA with,the flow structure has a static asymmetric *** is found that the channel width has also an effect on the critical spacing where the flow changes from single body mode into co-shedding *** an accurate survey on flows past two cylinders with equal diameters placed inside a channel with the width,the relation between channel width and the critical spacing is given and results show that the critical spacing increases as the channel width increases.

关键词： two tandem cylinders different diameters blockage ratio critical spacing Lattice Boltzmann Method(LBM)

Output Feedback Stabilization of an Unstable Wave Equation with Observations Subject to Time Delay

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Journal of Systems Science & Complexity 2016年第1期29卷 99-118页

作者： YANG Kunyi ren Xiang ZHANG jie College of Science North China University of Technology

This paper focuses on boundary stabilization of a one-dimensional wave equation with an unstable boundary condition,in which observations are subject to arbitrary fixed time *** observability inequality indicates that the open-loop system is observable,based on which the observer and predictor are designed:The state of system is estimated with available observation and then predicted without *** that equivalently the authors transform the original system to the well-posed and exponentially stable system by backstepping *** equivalent system together with the design of observer and predictor give the estimated output *** is shown that the closed-loop system is exponentially *** simulations are presented to illustrate the effect of the stabilizing controller.

关键词： Exponential stability observability inequality output feedback unstable boundary condition time delay wave equation

Mn、Zn、Sn掺杂CsPbI_(3)的稳定性和光电性质研究

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原子与分子物理学报 2025年第2期42卷 182-188页

作者：张仁杰陶红帅郝启圣内蒙古工业大学理学院呼和浩特010051

采用基于密度泛函理论的第一性原理,计算了本征CsPbI_(3)和Mn、Zn、Sn掺杂体系的形成能、电子结构和光学性质.研究结果表明:Mn、Zn、Sn的掺入减小了材料晶格常数,Mn原子掺入CsPbI_(3)晶体结构使得体系的磁矩由0变为5.00μ_(B),丰富了材... 详细信息

采用基于密度泛函理论的第一性原理,计算了本征CsPbI_(3)和Mn、Zn、Sn掺杂体系的形成能、电子结构和光学性质.研究结果表明:Mn、Zn、Sn的掺入减小了材料晶格常数,Mn原子掺入CsPbI_(3)晶体结构使得体系的磁矩由0变为5.00μ_(B),丰富了材料磁性.与Zn掺杂体系相比,Mn、Sn掺杂体系更为稳定.Mn掺杂体系增大了材料带隙,Zn、Sn的掺入使材料带隙分别减小了30.2%和16.2%,有利于电子极化跃迁,但Zn掺入使CsPbI_(3)材料转变为间接带隙半导体.在可见光区域中Mn、Zn、Sn掺杂体均表现出优异的光学性能,Sn掺杂体系效果最佳.这些研究结果为实验方面CsPbI_(3)材料的掺杂改性提供了数据支持,有利于CsPbI_(3)钙钛矿在光电领域的应用.

关键词： CsPbI_(3) 第一性原理电子结构光学性质