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Simulation study on performance optimization of a prototype scintillation detector for the GRANDProto35 experiment

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Nuclear Science and Techniques 2021年第5期32卷 71-83页

作者： Xiang-Li Qian hui-ying sun Cheng Liu Xu Wang Olivier Martineau-Huynh School of Intelligent Engineering Shandong Management UniversityJinan 250357China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Sorbonne Universite Universite Paris DiderotSorbonne Paris CiteCNRS/IN2P3LPNHEParisFrance

As a proposed detector,the giant radio array for neutrino detection(GRAND)is primarily designed to discover and study the origin of ultra-high-energy cosmic rays,with ultra-high-energy neutrinos presenting the main method for detecting ultra-high-energy cosmic rays and their *** main principle is to detect radio emissions generated by ultra-high-energy neutrinos interacting with the atmosphere as they *** is the largest neutrino detection array to be built in ***35,as the first stage of the GRAND experiment,is a coincidence array composed of radio antennas and a scintillation detector,the latter of which,as a traditional detector,is used to perform cross-validation with radio detection,thus verifying the radio detection efficiency and enabling study of the background exclusion *** study focused on the implementation of the optimization simulation and experimental testing of the performance of the prototype scintillation detector used in GRANDProto35.A package based on GEANT4 was used to simulate the details of the scintillation detector,including the optical properties of its materials,the height of the light guide box,and position *** surface of the scintillator and the reflective materials used in the detector was optimized,and the influence of light guide heights and position inhomogeneity on the energy and time resolutions of the detector was *** to the simulation study,the number of scintillator photoelectrons increased when changing from the polished surface to the ground surface,with the appropriate design height for the light guide box being 50 cm and the appropriate design area for the scintillator being 0.5 m^(2).The performance of the detector was tested in detail through a coincidence experiment,and the test results showed that the number of photoelectrons collected in the detector was$84 with a time resolution of~1 ns,indicating good *** simulation results were consistent with

关键词： GRANDProto35 GEANT4 Scintillation detector Light guide height Photoelectrons

Simulation study on cosmic ray background at large zenith angle based on GRANDProto35 coincidence array experiment

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Nuclear Science and Techniques 2021年第1期32卷 35-45页

作者： Xiang-Li Qian Xu Wang hui-ying sun Zhen Wang Olivier Martineau-Huynh School of Intelligent Engineering Shandong Management UniversityJinan 250357China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China Sorbonne Paris Cite CNRS/IN2P3LPNHESorbonne UniversiteUniversite Paris DiderotParisFrance

Neutrino detection in the 100 PeV energy region is the ultimate means of studying the origin of ultra-highenergy cosmic rays,in which the large radio detection array giant radio array for neutrino detection(GRAND)project aims to use to decipher this century-old *** GRANDProto35 compact array is a microform of 35 radio prototype detectors for the GRAND experiment,which verifies the reliability of GRAND performance through operation,and data analysis of the prototype *** radio detectors are a novel development in recent years,and their indexes need to be verified by traditional detectors,the GRAND Cooperation Group designed and constructed the GRANDProto35 coincidence array composed of radio detectors and scintillation *** study simulated the changes in detection efficiency,effective area,and event rate of cosmic rays with zenith angle based on this coincidence *** study found that the 1017 eV energy region is sensitive to GRANDProto35 *** the energy exceeded 1017 eV,the array detection efficiency could reach more than 95%and the effective area was up to*29106 m2.A simulation study on cosmic ray events with large zenith angles showed that the event rate detected by the array decreased significantly with increasing zenith angle,and the event rate of cosmic rays was approximately 0.1 per day for a zenith angle of 75.This serves as the background pollution rate for neutrino observation caused by largeangle cosmic-ray events,providing an important reference for further *** study results will be verified after the joint operation of the coincidence array.

关键词： GRANDProto35 GEANT4 Scintillation detector Cosmic ray

LIFTING FORCE ACTING ON A GATE WITH HIGH HEAD

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Journal of Hydrodynamics 2011年第3期23卷 379-383页

作者： LIU Xiao-qing ZHAO Lan-hao CAO hui-ying sun Xiao-peng College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China

The hydrodynamic lifting force acting on a gate with high head is one of the key factors concerning the safety and reliability of gates. The lifting force is closely related to hydrodynamic pressure, and generally, is obtained through the model test. This work presents a method of numerical simulation based on the VOF method for the flow and FEM for the structure of a gate to investigate this kind of the lifting force. The physical model experiments were conducted about the hydrodynamic pressure and the lifting force to verify the numerical results. The comparisons of those two methods show that the maximum relative error is smaller than 11.40 % and the method presented in this paper is feasible and could be used in the designs of hydropower projects.

关键词： gate pressure high head lifting force numerical simulation physical model experiment

The Application of Optimal Control in the Constant-Speed Control of Rotary Screen Rack

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The Application of Optimal Control in the Constant-Speed Con...

A new design method for the transition region of the valve plate for an axial piston pump

第25届中国控制与决策会议

作者： Tao Wang Jin-guo Hu ying-hui sun College of Automation and Electronic Engineering Qingdao University of Science and Technology Academic Affairs Office Qingdao University of Science and Technology

ISBN: (纸本)9781467355339

Aiming to the defects in the traditional speed-control of rotary screen rack, such as poor dynamic performance, poor noise immunity, untimely regulation and strong dependence on personnel and experience and so on, this paper proposes a linear quadratic regulator with status feedback, which was used in the constant-speed control of LHG type rotary screen rack. It can be easily and quickly solve riccati equation by using Matlab software to get the optimal state feedback gain matrix. The simulation result shows that the proposed method is obviously superior to the unit negative feedback control method in dynamic performance, noise immunity and steady precision.

关键词： LHG rotary screen rack quadratic optimal control state feedback secondary regulation technology

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2015年第3期16卷 229-240页

作者： Bing XU ying-hui sun Jun-hui ZHANG Tong sun Ze-bingMAO State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

The optimization of the valve plate transition region is an important way of reducing the noise emission for an axial piston pump. However, the optimized methods through simulation or experiment are actually trial and error, and they cannot indicate the precise structural parameters of the valve plate transition region. In this study, a new design method for the transition region of valve plate based on the matching of flow area and reduction of transient reverse flow was proposed, and with which a valve plate was designed. Then, the impact of the flow ripple in the discharge line of an axial piston pump and the pressure overshoot and undershoot in the piston chamber on hydraulic and structural noise for axial piston pump is discussed. The noise reduction effect of the axial piston pump with this valve plate was analyzed by adopting a flow characteristic simulation model. Finally, the results showed that the application of this design method could contribute much to the reduction of the flow ripple and elimination of the pressure overshoot and undershoot. As a consequence, the method can be used in the design of a low-noise open circuit axial piston pump.

关键词： Axial piston pump Valve plate Flow ripple Pressure overshoot

Hydrogen generation from ammonia electrolysis on bifunctional platinum nanocubes electrocatalysts

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Journal of Energy Chemistry 2020年第8期29卷 234-240,I0009页

作者： hui-ying sun Guang-Rui Xu Fu-Min Li Qi ng-Li ng Hong Pu-Jun Jin Pei Chen Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062ShaanxiChina School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi'an 710062ShaanxiChina

The ammonia electrolysis is a highly efficient and energy-saving method for ultra-pure hydrogen generation, which highly relies on electrocatalytic performance of electrocatalysts. In this work, high-quality platinum(Pt) nanocubes(Pt-NCs) with 4.5 nm size are achieved by facile hydrothermal synthesis. The physical morphology and structure of Pt-NCs are exhaustively characterized, revealing that Pt-NCs with special {100} facets have excellent uniformity, good dispersity and high crystallinity. Meanwhile, the electrocatalytic performance of Pt-NCs for ammonia electrolysis are carefully investigated in alkaline solutions, which display outstanding electroactivity and stability for both ammonia electrooxidation reaction(AEOR) and hydrogen evolution reaction(HER) in KOH solution. Furthermore, a symmetric Pt-NCs||Pt-NCs ammonia electrolyzer based on bifunctional Pt-NCs electrocatalyst is constructed, which only requires 0.68 V electrolysis voltage for hydrogen generation. Additionally, the symmetric Pt-NCs||Pt-NCs ammonia electrolyzer has excellent reversible switch capability for AEOR at anode and HER at cathode, showing outstanding alternating operation ability for ammonia electrolysis.

关键词： Ammonia electrolysis Water electrolysis Ammonia oxidation reaction Hydrogen evolution reaction Platinum nanocubes

Human podocyte injury in the early course of hypertensive renal injury

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World Journal of Clinical Cases 2019年第22期7卷 3698-3710页

作者： Da sun Jiao-Jiao Wang Wei Wang Juan Wang Li-Ning Wang Li Yao ying-hui sun Zi-Long Li Department of Nephrology The First Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina Department of Experimental Medicine General Hospital of Northern Theater CommandShenyang 110016Liaoning ProvinceChina

BACKGROUND Hypertension is prevalent in the general population and is regarded as the second leading cause of renal damage and dysfunction,outnumbered only by ***,the mechanisms remain *** To investigate podocyte injury induced by hypertension in the early course without massive proteinuria or renal *** The hypertension group comprised 18 patients with hypertension accompanied by microalbuminuria,diagnosed with hypertensive renal injury according to biopsy *** a comparison of pathological changes in renal tissue,control group 1 comprised 10 healthy volunteers,and control group 2 comprised 16 patients who underwent surgery for renal *** The hypertension group had significantly higher blood pressure(P=0.000)and microalbuminuria(P=0.000)compared with control group *** the hypertension group,urinary podocytes were detected following positive staining of podocytespecific nephrin and/or CD2-associated protein(CD2AP)in urine *** foot process fusion and a significant decrease in nephrin and/or CD2AP expression in glomeruli were observed in the hypertension group compared with control group *** indicated that hypertension caused podocyte injury and detachment from the glomerular basement membrane,which was consistent with urinary detection of *** Our results suggest that podocyturia appears early in the course of hypertensive renal injury,and may be a sensitive marker for early prediction of hypertensive renal injury.

关键词： Podocyte Hypertension Hypertensive renal injury Microalbuminuria Nephrin CD2-associated protein

Fatty Acid Synthase Inhibitors from Plants and Their Potential Application in the Prevention of Metabolic Syndrome

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Clinical oncology and cancer researeh 2011年第1期8卷 1-9页

作者： Wei-xi Tian Xiao-feng Ma Shu-yan Zhang ying-hui sun Bing-hui Li College of Life Sciences Graduate University of Chinese Academy of Sciences Beijing 100049 China College of Life Sciences Graduate University of Chinese Academy of Sciences Beijing 100049 China Institute of Biophysics Chinese Academy of Sciences Beijing 100101China Central Laboratory of Oncology Department Tianjin Medical University Cancer Institute and Hospital Tianjin 300060 China

Fatty acid synthase （FAS） attracts more and more attention recently as a potential target for metabolic syndrome,such as cancer, obesity, diabetes and cerebrovascular disease. FAS inhibitors are widely existed in plants, consisting of diversiform compounds. These inhibitors exist not only in herbs also in many plant foods, such as teas, allium vegetables and some fruits. These effective components include gallated catechins, theaflavins,flavonoids, condensed and hydrolysable tannins, thioethers,pentacyclic triterpenes, stilbene derivatives, etc, and they target at the different domains of FAS, showing different inhibitory mechanisms. Interestingly, these FAS inhibitor-contained herbs and plant foods and their effective components are commonly related to the prevention of metabolic syndromes including fatreducing and depression of cancer. From biochemical angle,FAS can control the balance between energy provision and fat production. Some studies have shown that the effects of those effective components in plants on metabolic syndromes are mediated by inhibiting FAS. This suggests that FAS plays a critical role in the regulation of energy metabolism, and the FAS inhibitors from plants have significant potential application value in the treatment and prevention of metabolic syndromes.

关键词： fatty acid synthase metabolic syndrome cancer metabolism inhibitor

Au core-PtAu alloy shell nanowires for formic acid electrolysis

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Journal of Energy Chemistry 2022年第2期31卷 94-102页

作者： Qi Xue Xin-Yu Bai Yue Zhao Ya-Nan Li Tian-Jiao Wang hui-ying sun Fu-Min Li Pei Chen Pujun Jin Shi-Bin Yin Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(MOE)Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710062ShaanxiChina MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004GuangxiChina

Inefficient electrocatalysts and high-power consumption are two thorny problems for electrochemical hydrogen(H2)production from acidic water *** we report the one-pot precise synthesis of ultrafine Au core-Pt Au alloy shell nanowires(Au@PtxAu UFNWs).Among them,Au@Pt_(0.077) Au UFNWs exhibit the best performance for formic acid oxidation reaction(FAOR)and hydrogen evolution reaction(HER),which only require applied potentials of 0.29 V and-22.6 m V to achieve a current density of 10 m A cm^(-2),*** corresponding formic acid electrolyzer realizes the electrochemical H2 production at a voltage of only 0.51 V with 10 m A cm^(-2) current *** functional theory(DFT)calculations reveal that the Au-riched Pt Au alloy structure can facilitates the direct oxidation pathway of FAOR and consequently elevates the FAOR activity of Au@Pt_(0.077) Au *** work provides meaningful insights into the electrochemical H_(2) production from both the construction of advanced bifunctional electrocatalysts and the replacement of OER.

关键词： Au core-PtAu alloy shell nanowires Formic acid oxidation reaction Reaction pathway Hydrogen evolution reaction Acidic water electrolysis