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Large eddy simulation of flow.over a three-dimensional hill w.th different slope angles

Frontiers of Earth Science 2024年第1期18卷 98-111页

作者： Liang LI Deqian zheng Guixiang chen Pingzhi FANG w.nyong MA Shengming TANG School of Civil Engineering Henan University of TechnologyZhengzhou 450001China Henan International Joint Laboratory of Modern Green Ecological Storage System Zhengzhou 450001China Henan Key Laboratory of Grain Storage Facility and Safety Zhengzhou 450001China Shanghai Typhoon Institute of China Meteorological Administration Shanghai 200030China w.nd Engineering Research Center Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Slope variation w.ll significantly affect the characteristics of the w.nd field around a *** paper conducts a large-eddy simulation(LES)on an ideal 3D hill to study the impact of slope on w.nd field *** slopes ranging from 10°to 45°at 5°intervals are considered,w.ich covers most conventional hill *** inflow.turbulence for the LES is generated by adopting a modified generation method that combines the equilibrium boundary conditions w.th the Fluent inherent vortex method to improve the simulation *** time-averaged flow.field and the instantaneous vortex structure under the eight slopes are comparatively *** accuracy of the present method is verified by comparison w.th experimental *** slope can affect both the mean and fluctuating w.nd flow.fields around the 3D hill,especially on the hilltop and the leew.rd side,w.ere a critical slope of 25°can be *** fluctuating w.nd speeds at the tops of steep hills(w.th slope angles beyond 25°)decrease w.th increasing slope,w.ile the opposite phenomenon occurs on gentle *** increasing slope,the energy of the high-speed descending airflow.is enhanced and pushes the separated flow.closer to the hill surface,resulting in increased w.nd speed near the w.ll boundary on the leew.rd side and inhibiting the development of *** vortex shedding trajectory in the w.ke region becomes w.der and longer,suppressing the grow.h of the mean w.nd near the w.ll boundary and enhancing the turbulence intensity.

关键词： large eddy simulation inflow.turbulence topographic w.nd field critical slope flow.mechanism

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Nitrite-catalyzed economic and sustainable bromocyclization of tryptamines/tryptophols to access hexahydropyrrolo[2,3-b]indoles/tetrahydrofuroindolines in batch and flow

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Chinese Chemical Letters 2024年第7期35卷 247-252页

作者： Xiao Xiao Biao chen Jia-w.i Li Jun-Bo zheng Xu w.ng Hang Zhao Fen-Er chen Institute of Pharmaceutical Science and Technology Collaborative Innovation Center of Yangtze River Delta Region Green PharmaceuticalsZhejiang University of TechnologyHangzhou 310014China College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China Engineering Center of Catalysis and Synthesis for Chiral Molecules Department of ChemistryFudan UniversityShanghai 200433China Shanghai Engineering Center of Industrial Asymmetric Catalysis for Chiral Drugs Shanghai 200433China

A highly efficient and concise bromocyclization has been successfully achieved,in w.ich tryptamine/tryptophol derivates can be transformed to valuable HPI/TFI scaffolds w.th economic and green ***,a controllable cascade transformation of bromocyclization and aromatic bromination has also been smoothly achieved to form dibrominated HPIs and *** could be successfully scaled up under both the batch process and a continuous flow.*** most remarkable peculiarity of our process over all previous methods is that the generated w.ter is the major ***,successful application of this new.protocol has been demonstrated by the pharmaceutical and natural products syntheses.

关键词： Tryptamines and tryptophols Nitrite Economic and sustainable bromocyclization HPI and TFI structures Bath and flow

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Analysis and monitoring of drug therapy in a patient w.th peptic ulcer complicated by infection:A case report

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w.rld Journal of Clinical Cases 2024年第8期12卷 1530-1535页

作者： Yan-Ping Gou Yue Huang Li chen w.i zheng Yun-Hua zheng The Second People’s Hospital of Meishan City&Renshou County People’s Hospital Meishan 620500Sichuan ProvinceChina Quality Evaluation and Medical Record Management The Affiliated Hospital of Southwest Jiaotong University&The Third People's Hospital of ChengduChengdu 610000Sichuan ProvinceChina Patriotic Health Campaign Qionglai City Health BureauChengdu 610000Sichuan ProvinceChina

BACKGROUND The role of primary-level medical pharmacists in medical institutions in China is limited;therefore,it is necessary to explore the role of pharmacists in the process of drug *** SUMMARY A Chinese pharmacist participated in the complete treatment of a patient w.th a duodenal *** rationale for drug treatment w.s evaluated,and adjustments w.re made to the antacid and anti-infective regimen,as w.ll as the dose and frequency of *** temperature,routine blood examination,and adverse drug reactions w.re strictly *** treatment,the pharmacist recommended anti-infective therapy w.th ampicillin-sulbactam,w.ich effectively controlled the ***,the pharmacist suggested changing famotidine to lansoprazole for acid suppression and gastroprotective treatment,combined w.th Chinese patent medicine such as Kangfuxin *** is the first case report of a pharmacist in primary-level medical institutions adjusting drug use for patients w.th duodenal ulcer and pulmonary *** A pharmacist participated in the treatment process,provided individualized medication adjustment,and achieved good clinical results.

关键词： Ampicillin-sulbactam Famotidine Lansoprazole Kangfuxin Liquid Chinese pharmacist Case report

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Preparation and Photostriction Properties of BiFeO_(3)-BaTiO_(3)Ceramics

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Journal of w.han University of Technology(Materials Science) 2024年第5期39卷 1079-1086页

作者： zheng Zew.i ZHANG Liqiang chen chen CAO Minghe YI Zhiguo LIU Hanxing School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China School of Microelectronics Shanghai UniversityShanghai 200444China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Under illumination by 405,520 and 655 nm monochromatic visible light(light intensity of 30 kw.m^(2)),large photostriction(ΔL/L)of 0.19%,0.13%and 0.26%for 67BiFeO_(3)-33BaTiO_(3)(67BF-33BT)lead-free ferroelectric ceramics are obtained,*** studying the ferroelectric and photoelectric properties in conjunction w.th in situ Raman spectroscopy,it is found that the photostrictive effect of 67BF-33BT is not caused by the electrical strain induced by abnormal photovoltaic voltage,but related to the optical induced oxygen octahedral *** 67BF-33BT lead-free ferroelectric material w.th excellent photostrictive response in the visible light region is expected to play an important role in the field of optical drive electromechanical devices.

关键词： ferroelectric ceramics photostrictive effect visible light response

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Tunable quantum dots in monolithic Fabry-Perot microcavities for high-performance single-photon sources

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Light(Science & Applications) 2024年第2期13卷 325-332页

作者： Jiaw.i Yang Yan chen Zhixuan Rao Ziyang zheng Changkun Song Yujie chen Kaili Xiong Pingxing chen Chaofan Zhang w.i w. Ying Yu Siyuan Yu State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Quantum Information Mechanism and Technology National University of Defense TechnologyChangsha 410073 HunanChina Hefei National Laboratory Hefei 230088China

Cavity-enhanced single quantum dots(QDs)are the main approach tow.rds ultra-high-performance solid-state quantum light sources for scalable photonic quantum ***,harnessing the Purcell effect requires precise spectral and spatial alignment of the QDs’emission w.th the cavity mode,w.ich is challenging for most *** w. have successfully integrated miniaturized Fabry-Perot microcavities w.th a piezoelectric actuator,and demonstrated a bright single-photon source derived from a deterministically coupled QD w.thin this *** the cavity-membrane structures,w. have achieved large spectral tunability via strain *** resonance,a high Purcell factor of~9 is *** source delivers single photons w.th simultaneous high extraction efficiency of 0.58,high purity of 0.956(2)and high indistinguishability of 0.922(4).Together w.th its compact footprint,our scheme facilitates the scalable integration of indistinguishable quantum light sources on-chip,therefore removing a major barrier to the development of solid-state quantum information platforms based on QDs.

关键词： quantum removing purity

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MoP nanoparticles encapsulated in N-doped carbon nanotubes as sulfur host for advanced lithium-sulfur batteries

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Nano Research 2024年第4期17卷 2736-2745页

作者： Guozhi w. Shanqing Li zheng chen Ajiao Sun Jie Yang Sang w.o Joo Jiarui Huang Key Laboratory of Functional Molecular Solids of the Ministry of Education Anhui Laboratory of Molecule-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China Anhui Engineering Research Center of Highly Reactive Micro-Nano Pow.ers School of Materials and Environmental engineeringChizhou UniversityChizhou 247000China School of Mechanical Engineering Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea

The low.electrical conductivity of sulfur,strong volume expansion,shuttle effect,and sluggish redox reactions in Li-S batteries limit their practical *** nanoparticles encapsulated in nitrogen-doped carbon nanotubes(MoP/NC NTs)w.re synthesized using MoO_(3) nanorods as templates via a polypyrrole coating,heat-carbonization,MoO_(3) partial reduction,ammonia w.shing,and *** MoP/NC NTs had a hollow.nanostructure w.th a high specific surface area,w.ich can alleviate the volume expansion of the cathode and the shuttle effect of *** encapsulated MoP nanoparticles can anchor the polysulfides and enhance the redox reaction ***,the MoP/NC NTs combined w.th sulfur(MoP/S/NC NTs)exhibited 440.8 mAh·g^(-1) over 500 cycles at 1.0 A·g^(-1) w.th a decay rate of 0.06%per *** density functional theory calculations and X-ray photoelectron spectroscopy results confirmed that MoP/NC NTs could anchor polysulfides and alleviate the shuttle effect by chemical *** study supplies a novel route to prepare nanoparticle-embedded in N-doped carbon nanotubes for advanced Li-S battery.

关键词： MoP N-doped carbon nanotube lithium-sulfur battery cathode

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Microstructural evolution in lithium plating process and its effect on the calendar storage life

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Nano Research 2024年第10期17卷 8834-8841页

作者： Ki Hw.n Koh Dong Ju Lee Anthony Mu Kangw.on Kim Taehee Kim zheng chen Department of Chemical and Nano Engineering University of California San DiegoLa JollaCA 92093USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA Sustainable Pow.r and Energy Center University of California San DiegoLa JollaCA 92093USA

The grow.ng demand for electric vehicles highlights the need for energy storage solutions w.th higher densities,spotlighting Li metal anodes as potential successors to traditional Li-ion batteries(LIBs).Achieving longer calendar aging life for Li metal anodes is crucial for their practical use,given their propensity for corrosion due to a low.redox potential,w.ich leads to compromised cycling stability and significant capacity loss during *** research investigated that this susceptibility is mainly dependent on the surface area of Li metal anode and the properties of the solid electrolyte interphase(SEI),particularly its stability and grow.h *** research adds to this understanding by demonstrating that the amount of Li plating is a key factor in its corrosion during open-circuit storage,as assessed across various *** discovered that increasing the Li plating amount effectively reduces Coulombic efficiency(C.E.)loss during aging,due to a low.r surface area-to-Li *** implies that the choice of electrolyte for optimal storage life should consider the amount of Li plating,w.th higher capacities promoting better storage characteristics.

关键词： lithium metal batteries anode-free batteries calendar life of batteries lithium anode corrosion

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Rational Design of Ruddlesden-Popper Perovskite Ferrites as Air Electrode for Highly Active and Durable Reversible Protonic Ceramic Cells

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Nano-Micro Letters 2024年第9期16卷 308-324页

作者： Na Yu Idris Temitope Bello Xi chen Tong Liu zheng Li Yufei Song Meng Ni Department of Building and Real Estate Research Institute for Sustainable Urban Development(RISUD)and Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityHung HomKowloonHong KongPeople’s Republic of China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057GuangdongPeople’s Republic of China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayHong KongPeople’s Republic of China

Reversible protonic ceramic cells(RePCCs)hold promise for efficient energy storage,but their practicality is hindered by a lack of high-performance air electrode ***-Popper perovskite Sr_(3)Fe_(2)O_(7−δ)(SF)exhibits superior proton uptake and rapid ionic conduction,boosting ***,excessive proton uptake during RePCC operation degrades SF’s crystal structure,impacting *** study introduces a novel A/B-sites co-substitution strategy for modifying air electrodes,incorporating Sr-deficiency and Nb-substitution to create Sr_(2.8)Fe_(1.8)Nb_(0.2)O_(7−δ)(D-SFN).Nb stabilizes SF’s crystal,curbing excessive phase formation,and Sr-deficiency boosts oxygen vacancy concentration,optimizing oxygen *** D-SFN electrode demonstrates outstanding activity and durability,achieving a peak pow.r density of 596 mw.cm^(−2)in fuel cell mode and a current density of−1.19 A cm^(−2)in electrolysis mode at 1.3 V,650℃,w.th excellent cycling *** approach holds the potential for advancing robust and efficient air electrodes in RePCCs for renew.ble energy storage.

关键词： Reversible protonic ceramic cells Air electrode Ruddlesden-Popper perovskite Hydration Oxygen reduction reaction

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Tackling the proton limit under industrial electrochemical CO_(2)reduction by a local proton shuttle

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Carbon Energy 2024年第4期6卷 233-243页

作者： Tianye Shao Kang Yang Sheng chen Min zheng Ying Zhang Qiang Li Jingjing Duan MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringSchool of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjingChina School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSouth AustraliaAustralia

Industrial CO_(2)electroreduction has received tremendous attentions for resolution of the current energy and environmental crisis,but its performance is greatly limited by mass transport at high current *** this w.rk,an ion‐polymer‐modified gas‐diffusion electrode is used to tackle this proton *** is found that gas diffusion electrode‐Nafion show. an impressive performance of 75.2%Faradaic efficiency in multicarbon products at an industrial current density of 1.16 A/cm^(2).Significantly,in‐depth electrochemical characterizations combined w.th in situ Raman have been used to determine the full w.rkflow.of protons,and it is found that HCO_(3)^(−)acts as a proton pool near the reaction environment,and HCO_(3)^(−)and H_(3)O^(+)are local proton donors that interact w.th the proton shuttle−SO_(3)^(−)from *** rich proton hopping sites that decrease the activation energy,a“Grotthuss”mechanism for proton transport in the above system has been identified rather than the“Vehicle”mechanism w.th a higher energy ***,this w.rk could be very useful in terms of the achievement of industrial CO_(2)reduction fundamentally and practically.

关键词： industrial CO_(2)electroreduction proton donor proton pool proton shuttle proton transport mechanism

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Recent progress on mechanisms,principles,and strategies for high-activity and high-stability non-PGM fuel cell catalyst design

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Carbon Energy 2024年第5期6卷 25-52页

作者： Yuping Yuan Yun zheng Dan Luo w.ibin Qiu Jiantao w.ng Xin w.ng Zhongw.i chen GRINM(Guangdong)Institute of New.Materials Technology FoshanChina Department of Chemical Engineering Waterloo Institute for NanotechnologyWaterloo Institute for Sustainable EnergyUniversity of WaterlooWaterlooOntarioCanada Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangdongChina National Pow.r Battery Innovation Center GRINM Group Co.Ltd.BeijingChina

The commercialization of a polymer membrane H2-O2 fuel cell and its w.despread use call for the development of cost-effective oxygen reduction reaction(ORR)nonplatinum group metal(NPGM)***,to meet the requests for the real-w.rld fuel cell application and replacing platinum catalysts,it still needs to address some challenges for NPGM catalysts regarding the sluggish ORR kinetics in the cathode and their poor durability in acidic *** response to these issues,numerous efforts have been made to study NPGM catalysts both theoretically and experimentally,developed these into the atomically dispersed coordinated metal-nitrogen-carbon(M-N-C)form over the past *** this review.w. present a comprehensive summary of recent advancements on NPGM catalysts w.th high activity and *** design strategies in terms of optimizing active-site density and enhancing catalyst stability against demetalization and carbon corrosion are *** is also emphasized the importance of understanding the mechanisms and principles behind those strategies through a combination of theoretical modeling and experimental ***,further understanding the mechanisms related to the active-site structure and the formation process of the single-atom active site under pyrolysis conditions is critical for active-site *** the active-site distance is the basic principle for improving catalyst activity through increasing the catalyst active-site *** studies for the catalyst deactivation mechanism and modeling stable active-site structures provide both mechanisms and principles to improve the NPGM catalyst ***,currently remained challenges and perspectives in the future on designing high-performance atomically dispersed NPGM catalysts tow.rd fuel cell application are discussed.

关键词： batteries electrocatalysis energy storage and conversion fuel cells

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