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基于Fluent的板管型蒸发式冷凝器的流动与换热研究

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节能技术 2024年第3期42卷 213-218,236页

作者：孙凯刘湘云柯秀芳陈观生刘良德吴宏伟广东工业大学材料与能源学院广东广州510006 广州城建职业学院机电学院广东广州510925 英国赫特福德大学机械工程学院赫特福德郡284000

为了研究板管型蒸发式冷凝器的流动和传热特性,并优化其板片凹陷孔的结构,本研究采用商用软件Fluent对气液流动模型进行数值模拟。通过控制变量、逐层优化的方法,研究了各雷诺数(Re)下板片凹陷孔的不同深度(H)和小直径(D_(1))对板片流... 详细信息

为了研究板管型蒸发式冷凝器的流动和传热特性,并优化其板片凹陷孔的结构,本研究采用商用软件Fluent对气液流动模型进行数值模拟。通过控制变量、逐层优化的方法,研究了各雷诺数(Re)下板片凹陷孔的不同深度(H)和小直径(D_(1))对板片流动与换热效率的影响。研究发现,在所有Re的条件下,努塞尔数(Nu)随着H的增大而增大,且存在一个最佳值——H=3 mm,当H继续增加时,Nu反而开始下降。在确定H的最佳值后,发现在所有Re的条件下,不同D_(1)对Nu的变化影响也存在一个最佳值D_(1)=6 mm,使得换热效果最好。通过实验验证,最佳尺寸下的数值模拟结果与实验结果吻合较好。虽然Re越大,换热效果越好,但也带来了更高的能耗,因此在最佳结构下需要在能耗和效率之间做出取舍。

关键词：蒸发式冷凝器数值模拟强化换热结构优化气液两相

Effectiveness and Controversy of Convalescent Plasma Therapy for Coronavirus Disease 2019 Patients

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Infectious Diseases & Immunity 2022年第1期2卷 49-54页

作者： Zhanjun Shu Peipei Wu Qianqian Qian Li Zhou Dandan Du Mengxuan Ding Tao Peng ke fang Research Institute of TCM of Affiliated Fourth Hospital in Xinjiang Medical University UrumuqiXinjiang 830000China The Eighth Affiliated Hospital of The Xinjiang Medical University UrumuqiXinjiang 830000China Department of Nephrology China-Japan Friendship HospitalNo.2East Yinghuayuan StreetBeijing 100029China Xinjiang Medical University UrumuqiXinjiang 830000China

Since the coronavirus disease 2019(COVID-19)began to spread,it remains pandemic *** European Medicines Agency’s human medicines committee and Food and Drug Administration have only granted a conditional marketing authorization for remdesivir to treat *** is essential to apply other valuable *** plasma(CP),donated by persons who have recovered from COVID-19,is the cellular component of blood that contains specific ***,to determine the feasibility of CP for COVID-19,the effectiveness and controversy are discussed in depth *** is suggested that CP plays a certain role in the treatment of *** a treatment,it may have its own indications and contraindications,which need to be further ***,it is critical to establish a standard procedure for treatment from CP collection,preservation,transport,to transfusion,and conduct some large sample randomized controlled trials to confirm the transfusion dosage,appropriate time,frequency,and actively prevent adverse outcomes that may occur.

关键词： COVID-19 Controversy Convalescent plasma Effectiveness Therapy

若尔盖国家自然公园四川片区不同生境下土壤细菌群落结构及多样性分析

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西南农业学报 2024年第07期37卷 1581-1589页

作者：郭静微魏真真代英王毛李伟袁方柯陈玉林马玉兰泽仁措肖敏四川省农业科学研究院植物保护研究所阿坝州生态保护与发展研究院阿坝州农业农村局农产品质量安全中心

【目的】揭示若尔盖国家自然公园四川片区不同生境下土壤细菌的群落结构及物种多样性。【方法】以若尔盖国家公园四川片区不同生境下的5种土壤(沼泽土、亚高山草甸土、草甸土、褐土和风沙土)为研究对象，借助高通量测序技术对土壤细菌... 详细信息

【目的】揭示若尔盖国家自然公园四川片区不同生境下土壤细菌的群落结构及物种多样性。【方法】以若尔盖国家公园四川片区不同生境下的5种土壤(沼泽土、亚高山草甸土、草甸土、褐土和风沙土)为研究对象，借助高通量测序技术对土壤细菌多样性和群落结构进行分析，并讨论土壤理化性质与菌群结构的关系。【结果】(1)在土壤细菌分类研究中，共鉴定出36个门，其中优势菌群为放线菌门(Actinobacteriota)、变形菌门(Proteobacteria)、厚壁菌门(Firmicutes)、酸杆菌门(Acidobacteriota)和绿弯菌门(Chloroflexi)。(2)在不同土壤细菌α-多样性分析中，亚高山草甸土(YGS)的Chao1、Observed Species、Shannon和Simpson指数均为最高，表明该土壤中细菌群落数量和多样性最高。(3)在不同土壤细菌β-多样性分析中，褐土(HT)、沼泽土(ZZT)、亚高山草甸土(YGS)以及风沙土(ST)相互高度重叠，表明该地区这4种土壤细菌群落结构组成相似，而草甸土(CD)土壤细菌群落具有显著差异(P<0.05)。(4)对不同生境的RDA冗余分析中，放线菌门与土壤pH呈正相关；变形菌门与土壤pH和全钾(TK)呈正相关；厚壁菌门与有机质(SOM)、全氮(TN)、全磷(TP)和含水量(MC)显著正相关。【结论】本研究揭示了若尔盖自然公园四川片区不同生境下土壤细菌群落组成结构的差异性和多样性，以及这些差异与环境因子的强相关性。该结果不仅有助于深化对土壤微生物生态学的理解，而且为土壤生态系统的管理提供了科学依据。

关键词：若尔盖国家公园土壤细菌群落结构高通量测序

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Flexibility as a Strategy for Avoiding Call Overlap in Male Anhui Treefrogs

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Asian Herpetological Research 2020年第3期11卷 230-239页

作者： Jinjin SONG Ruolei SUN ke fang Baowei ZHANG Yezhong TANG Guangzhan fang School of Life Science Anhui UniversityHefei 230601AnhuiChina Chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041SichuanChina Institute of Bio-inspired Structure and Surface Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016JiangsuChina

Male-male vocal competition is critical for mating success in anuran species;however,it remains unknown that how males regulate their competitive strategies dynamically during competition because calling is highly time-consuming,energetically demanding and likely to increase predation *** different parts of calls will encode different information for vocal communication,we hypothesized that competitive strategies of male frogs may be modulated by the temporal and spectral features of different call *** test this hypothesis,the natural advertisement calls(OC),its modified versions with the first call note replaced by white noise(WN)or other notes and with the fifth call note replaced by WN,were played back to the Anhui tree frogs(Rhacophorus zhoukaiyae).Results showed that 1)males produced more competitive calls in response to acoustic stimuli compared to their baseline calling during silence;and 2)males emitted more non-overlapping calls compared to overlapping calls in response to the acoustic *** results are consistent with the idea that males are flexible to acoustic signals and their competition strategies are modulated dynamically by social contexts.

关键词： acoustic stimulus call overlap flexibility frog individual recognition male-male competition

Sub-Seasonal Predictability of the Northeast China Cold Vortex in BCC and ECMWF S2S Model Forecasts for 2006-2021

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Journal of Meteorological Research 2024年第3期38卷 453-468页

作者： Yiqiu YU Jie WU Yihe fang Chunyu ZHAO Zongjian ke Yitong LIN Liaoning Provincial Climate Centre Liaoning Provincial Meteorological AdministrationShenyang110166China key Opening Laboratory for Northeast China Cold Vortex Research China Meteorological AdministrationShenyang110166China Panjin National Climate Observatory Panjin124000China China Meteorological Administration key Laboratory for Climate Prediction Studies National Climate CentreChina Meteorological AdministrationBeijing100081China Jilin Provincial Climate Centre Jilin Provincial Meteorological AdministrationChangchun130062China

As an important atmospheric circulation system in the mid-high latitudes of East Asia,the Northeast China cold vortex(NCCV)substantially influences weather and climate in this *** far,systematic assessment on the performance of numerical prediction of the NCCVs has not been carried *** on the Beijing Climate Centre(BCC)and the ECMWF model hindcast and forecast data that participated in the Sub-seasonal to Seasonal(S2S)Prediction Project,this study systematically examines the performance of both models in simulating and forecasting the NCCVs at the sub-seasonal *** results demonstrate that the two models can effectively capture the seasonal variations in the intensity,active days,and spatial distribution of NCCVs;however,the duration of NCCVs is shorter and the intensity is weaker in the models than in the *** analysis shows that the differences in the intensity and location of the East Asian subtropical westerly jet and the wave train pattern from North Atlantic to East Asia may be responsible for the deficient simulation of NCCV events in the S2S ***,in the deterministic forecasts,BCC and ECMWF provide skillful prediction on the anomalous numbers of NCCV days and intensity at a lead time of 4-5(5-6)pentads,and the skill limit of the ensemble mean is 1-2 pentads longer than that of individual *** the probabilistic forecasts of daily NCCV activities,BCC and ECMWF exhibit a forecasting skill of approximately 7 and 11 days,respectively;both models show seasonal dependency in the simulation performance and forecast skills of NCCV events,with better performance in winter than in *** results from this study provide helpful references for further improvement of the S2S prediction of NCCVs.

关键词： Northeast China cold vortex(NCCV) predictability sub-seasonal to seasonal(S2S)prediction deterministic forecast probabilistic forecast

AdaPIP: Adaptive picture-in-picture guidance for 360 ◦ film watching

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Computational Visual Media 2024年第3期10卷 487-503页

作者： Yi-Xiao Li Guan Luo Yi-ke Xu Yu He fang-Lue Zhang Song-Hai Zhang Department of Computer Science and Technology Tsinghua UniversityBeijingChinaand Beijing National Research Center for Information Science and Technology(BNRist)Tsinghua UniversityBeijingChina key Laboratory of Space Utilization Technology and Engineering Center for Space UtilizationChinese Academy of SciencesBeijingChina Victoria University of Wellington WellingtonNew Zealand

360◦videos enable viewers to watch freely from different directions but inevitably prevent them from perceiving all the helpful *** mitigate this problem,picture-in-picture(PIP)guidance was proposed using preview windows to show regions of interest(ROIs)outside the current view *** identify several drawbacks of this representation and propose a new method for 360◦ﬁlm watching called *** enhances traditional PIP by adaptively arranging preview windows with changeable view ranges and *** addition,AdaPIP incorporates the advantage of arrow-based guidance by presenting circular windows with arrows attached to them to help users locate the corresponding ROIs more *** also adapted AdaPIP and Outside-In to HMD-based immersive virtual reality environments to demonstrate the usability of PIP-guided approaches beyond 2D *** user experiments on 2D screens,as well as in VR environments,indicate that AdaPIP is superior to alternative methods in terms of visual experiences while maintaining a comparable degree of immersion.

关键词： 360◦videos picture-in-picture(PIP) virtual reality(VR) visual guidance

Interface engineering strategy via electron-defect trimethyl borate additive toward 4.7 V ultrahigh-nickel LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)battery

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Journal of Energy Chemistry 2024年第5期92卷 639-647页

作者： Yilin Zhang Yuqing Chen Qiu He Jinlong ke Wei Wang Jian-fang Wu Peng Gao Yanhua Li Jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha 410082HunanChina College of Materials Science and Engineering Sichuan UniversityChengdu 610065SichuanChina School of Materials Science and Engineering Hunan Institute of TechnologyHengyang 421002HunanChina

The Li metal battery with ultrahigh-nickel cathode(LiNi_(x)M_(1-x)O_(2),M=Mn,Co,and x≥0.9)under high-voltage is regarded as one of the most promising approaches to fulfill the ambitious target of 400 Wh/***,the practical application is impeded by the instability of electrode/electrolyte interface and Ni-rich cathode *** we proposed an electron-defect electrolyte additive trimethyl borate(TMB)which is paired with the commercial carbonate electrolyte to construct highly conductive fluorine-and boron-rich cathode electrolyte interface(CEI)on LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)(NCM90)surface and solid electrolyte interphase(SEI)on lithium metal *** modified CEI effectively mitigates the structural transformation from layered to disordered rock-salt phase,and consequently alleviate the dissolution of transition metal ions(TMs)and its“cross-talk”effect,while the enhanced SEI enables stable lithium plating/striping and thus demonstrated good compatibility between electrolyte and lithium metal *** a result,the common electrolyte with 1 wt%TMB enables 4.7 V NCM90/Li cell cycle stably over 100 cycles with 70%capacity *** work highlights the significance of the electron-defect boron compounds for designing desirable interfacial chemistries to achieve high performance NCM90/Li battery under high voltage operation.

关键词： NCM90 batteries Electrolyte additive Trimethyl borate

Adaptive pandemic management strategies for construction sites:An agent-based modeling approach

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Frontiers of Engineering Management 2024年第2期11卷 288-310页

作者： Chengqian LI Qi fang ke CHEN Zhikang BAO Zehao JIANG Wenli LIU School of Civil Engineering Hunan UniversityChangsha 410082China School of Civil Engineering Central South UniversityChangsha 410004China School of Civil and Hydraulic Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Energy GeoscienceInfrastructureand SocietyHeriot-Watt UniversityEdinburghUK

In the face of sudden pandemics,it becomes crucial for project managers to quickly adapt and make informed decisions that anticipate the consequences of their *** highlights the need for proactive management strategies to enhance epidemic response ***,current research mainly emphasizes the negative impacts of pandemics,often neglecting the development of adaptable management approaches for construction *** study aims to fill this research void by developing strategies tailored to managing pandemics at construction *** agent-based modeling,the study simulates the movement patterns of workers and the consequent spread of an epidemic under different risk scenarios and management *** results indicate that measures such as wearing masks,managing group activities,and enforcing entry controls can significantly reduce epidemic spread on construction sites,with entry controls showing the greatest effectiveness.

关键词： epidemic transmission agent-based modeling safety management management strategy

FPGA-based position reconstruction method for neutron beam flux spatial distribution measurement in BNCT

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Nuclear Science and Techniques 2024年第3期35卷 96-108页

作者： Wei Jiang Ping Cao Yi-Ming Wu Xian-ke Liu Zhu-Jun fang Zhi-Yong Zhang Bin Shi Jun Chen State key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China National key Laboratory for Metrology and Calibration Techniques China Institute of Atomic EnergyBeijing 102413China

A new measurement method for the spatial distribution of neutron beam flux in boron neutron capture therapy(BNCT)is being developed based on the two-dimensional Micromegas *** address the issue of long processing times in traditional offline position reconstruction methods,this paper proposes a field programmable gate array based online position reconstruction method utilizing the micro-time projection chamber *** method encapsulates key technical aspects:a self-adaptive serial link technique built upon the dynamical adjustment of the delay chain length,fast sorting,a coordinate-matching technique based on the mapping between signal timestamps and random access memory(RAM)addresses,and a precise start point-merging technique utilizing a circular combined *** performance test of the selfadaptive serial link shows that the bit error rate of the link is better than 10-12 at a confidence level of 99%,ensuring reliable data *** experiment utilizing the readout electronics and Micromegas detector shows a spatial resolution of approximately 1.4 mm,surpassing the current method’s resolution level of 5 *** beam experiment confirms that the readout electronics system can obtain the flux spatial distribution of neutron beams online,thus validating the feasibility of the position reconstruction *** online position reconstruction method avoids traditional methods,such as bubble sorting and traversal searching,simplifies the design of the logic firmware,and reduces the time complexity from O(n2)to O(n).This study contributes to the advancement in measuring neutron beam flux for BNCT.

关键词： Position reconstruction FPGA Readout electronics Neutron flux spatial distribution