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CLDASSD:Reconstructing Fine Textures of the Temperature Field Using Super-Resolution Technology

Advances in Atmospheric Sciences 2022年第1期39卷 117-130页

作者： Ruian TIE Chunxiang SHI Gang Wan Xingjie HU Lihua KANG Lingling GE Institute of Aerospace Information Space Engineering UniversityBeijing 101400China National Meteorological Information Center China Meteorological AdministrationBeijing 100081China

Before 2008,the number of surface observation stations in China was small.Thus,the surface observation data were too sparse to effectively support the High-resolution China Meteorological Administration’s Land Assimilation System(HRCLDAS)which ultimately inhibited the output of high-resolution and high-quality gridded products.This paper proposes a statistical downscaling model based on a deep learning algorithm in super-resolution to research the above problem.Specifically,we take temperature as an example.The model is used to downscale the 0.0625°×0.0625°,2-m temperature data from the China Meteorological Administration’s Land Data Assimilation System(CLDAS)to 0.01°×0.01°,named CLDASSD.We performed quality control on the paired data from CLDAS and HRCLDAS,using data from 2018 and 2019.CLDASSD was trained on the data from 31 March 2018 to 28 February 2019,and then tested with the remaining data.Finally,extensive experiments were conducted in the Beijing-Tianjin-Hebei region which features complex and diverse geomorphology.Taking the HRCLDAS product and surface observation data as the"true values"and comparing them with the results of bilinear interpolation,especially in complex terrain such as mountains,the root mean square error(RMSE)of the CLDASSD output can be reduced by approximately 0.1℃,and its structural similarity(SSIM)was approximately 0.2 higher.CLDASSD can estimate detailed textures,in terms of spatial distribution,with greater accuracy than bilinear interpolation and other sub-models and can perform the expected downscaling tasks.

关键词： statistical downscaling deep learning temperature field high-resolution reconstruction

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Regulation of RNA granules in RNAi inheritance

Regulation of RNA granules in RNAi inheritance

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2021年全国生物相分离和相变学术研讨会

作者： Gang Wan MOE Key Laboratory of Gene Function and Regulation State Key Laboratory of BiocontrolSchool of Life SciencesSun Yat-sen University

Germ granules are protein/RNA condensates that form in germ cells of all/most animals,where they regulate mRNA expression to promote germ cell function and totipotency.In the adult Caenorhabditis elegans germ cell,these RNA granules are composed of at least four distinct subcompartments,PZMS.To better understand the role of RNA granules in germ cell biology,we conducted genetic screens for genes required for RNA granule assembly or morphology.We found dozens of mutants,three of them,which encode a low-complexity/polyampholyte-domain protein termed ZSP-1,is required for Z granule homeostasis.ZSP-1 localizes to the outer surface of Z granules.In the absence of ZSP-1,Z granules swell to an abnormal size,fail to segregate with germline blastomeres during development,and lose their liquid-like character.Finally,ZSP-1 promotes piRNA-and siRNA-directed gene regulation and germline immortality.Our data suggest that RNA granules coordinate small RNA-based gene regulation to promote germ cell function and that ZSP-1 helps/is need to maintain Z granule morphology and liquidity.

关键词： gene regulation germ granules germline immortality molecular condensates small RNA RNAi inheritance

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Performance analysis of BDS-3 Klobuchar model

Performance analysis of BDS-3 Klobuchar model

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第十四届中国卫星导航年会

作者： Yongxing Zhu Gang Wan Xianggao Yan State Key Laboratory of Geo-information Engineering Xi'an Research Institute of Survey and Mapping National Space Science Center Chinese Academy of Sciences School of Space Information Space Engineering University College of Geological Engineering and Geomatics Chang'an University

Since July 2020, the global Beidou Navigation Satellite System(BDS-3) satellites provide new B1C and B2a public navigation service signals,as well as the legacy B1I and B3I signals. With the opening of BDS-3 system global service, the service area of the broadcast Klobuchar model(BDSKlob)parameters expanded from China and parts of the Asia-Pacific region to the whole world. In this study, the differences between the GPS Klobuchar model(GPSKlob) and the BDSKlob is comprehensively analyzed. The data since the opening of the BDS-3 is collected, and the results show that:(1) the average correction accuracy of the BDSKlob model in global-scale is about 4.61-5.75TECU;(2) the correction abnormalities of the modifed BDSKlob model in high latitude region has been improved significantly;(3) the interchangeability between the BDSKlob and the GPSKlob model algorithm has been verified, is initially verified.

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High-energy nuclear physics meets machine learning

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Nuclear Science and Techniques 2023年第6期34卷 9-41页

作者： wan-Bing He Yu-gang Ma Long-gang Pang Hui-Chao Song Kai Zhou Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai200438China Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan430079China School of Physics and Center for High Energy Physics Peking UniversityBeijing100871China Frankfurt Institute for Advanced Studies(FIAS) 60438Frankfurt am MainGermany

Although seemingly disparate,high-energy nuclear physics(HENP)and machine learning(ML)have begun to merge in the last few years,yielding interesting results.It is worthy to raise the profile of utilizing this novel mindset from ML in HENP,to help interested readers see the breadth of activities around this intersection.The aim of this mini-review is to inform the community of the current status and present an overview of the application of ML to HENP.From different aspects and using examples,we examine how scientific questions involving HENP can be answered using ML.

关键词： Heavy-ion collisions Machine learning Initial state Bulk properties Medium effects Hard probes Observables

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Numerical simulation on the pressure wave in a 30 mm electrothermal-chemical gun with the discharge rod plasma generator

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Defence Technology（防务技术） 2019年第5期15卷 674-679页

作者： Yan-jie Ni Yong Jin Gang Wan Bao-ming Li National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094JiangsuChina China Academy of Ordnance 100089BeijingChina

An axisymmetric two-dimensional(2D)internal ballistic model including the transient burning rate law is used to simulate the 30mm electrothermal-chemical(ETC)launch with the discharge rod plasma generator(DRPG).The relationship between the pressure wave and the initial parameters,such as input electric power,discharging timing sequence,loading density and propellant web thickness,is researched through the change of initial parameters in the model.In the condition of synchronous discharging,the maximum of the pressure wave can be controlled while the ratio of the input electric energy to the propellant chemical energy(electric energy ratio)is less than 0.11.If the electric energy ratio is larger than 0.11,the maximum of the pressure wave increases rapidly with the electric energy ratio.With the increasing of the electric energy ratio,the change of the first negative amplitude value can be ignored.In the condition of timing sequence discharging,the allowed input electric energy ratio to control the pressure wave is proportional to the current pulse duration.At the high electric energy ratio,the maximum of the pressure wave is inverse proportional to the current pulse duration.The pressure wave increases with the increasing of the loading density.But the allowed electric energy ratio to control the pressure wave and the variation trend of the first negative amplitude wave value doesn't change.During the discharging of the DRPG,the influence of changing propellant web thickness in ETC launch can be ignored.

关键词： Electrothermal-chemical launch Pressure wave Plasma Solid propellant Electric energy ratio

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Evaluation of the relative differences in building energy simulation results

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Building Simulation 2022年第11期15卷 1977-1987页

作者： Dan wang Xiufeng Pang Wei wang Chuan wan Gang Wang Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology Beijing University of TechnologyBeijing 100124China National Engineering Research Center of Building Technology Beijing 100013China Beijing Institute of Petrochemical Technology No.19 Qingyuan RoadDaxing DistrictBeijing 102627China Department of Civil Architectural and Environmental EngineeringUniversity of MiamiMiamiFL 33146USA

Building energy modeling,also known as building energy simulation,has developed rapidly in recent years and plays a crucial role in building life-cycle analysis.It can be employed in the design phase to predict the energy consumption of different design schemes and evaluate various control and retrofitting measures at the operation stage.In such simulations,it is commonly understood and accepted that the simulated relative differences are more reliable than the predictions of absolute energy results.However,whether this common understanding is true is yet to be thoroughly investigated.In this study,we investigate the simulated relative differences and the extent to which they are affected by the degree of model input deviation.Simulation and Monte Carlo approaches are adopted for the analysis.The results indicate that the simulated relative differences are not as reliable as expected,and the outputs strongly depend on the degree of the model input deviation.When the degree of deviation is less than 15%or the model inputs are within reasonable ranges,the simulated relative differences match the baseline obtained using Monte Carlo simulations.Moreover,the model’s error indicators meet the requirements of the ASHRAE Guideline 14–2014 when the degree of input deviation is below 15%.

关键词： simulated relative differences building energy simulation Monte Carlo simulation EnergyPlus

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PROMOTE HIGH-LEVEL OPENING AND COOPERATION AND CONTRIBUTE CHINA'S SCIENCE AND TECHNOLOGY TO BUILDING A HUMAN COMMUNITY WITH A SHARED FUTURE

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China News Release 2022年第2期 44-49页

作者： wan gang 不详

The year 2021 marked the centenary of the Communist Party of China.Under the strong leadership of the Party,China has created two miracles in the world,namely rapid economic growth and long-term social stability.China has made historic achievements in science and technology,from its humble beginnings to the forefront of science and technology in the world,demonstrating the advantages of the Chinese system.General Secretary Xi Jinping pointed out that science and technology are universal and contemporary,and are the common wealth of humankind.

关键词： stability. contemporary Communist

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Hydrodynamic performances and wakes induced by a generic submarine operating near the free surface in continuously stratified fluid

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水动力学研究与进展B辑:英文版 2023年第3期35卷 396-406页

作者： Liu-shuai Cao gang Gao En-kai Guo De-cheng wan School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The wake of a submarine is a crucial element that greatly affects its stealth and hydrodynamic performance.To investigate the propagation and evolution characteristics of submarine wakes in a stratified fluid,particularly under free surface conditions,a numerical method to simulate the linearly stratified environment was developed.A thermocline model based on Boussinesq assumption was introduced to match the continuously stratified fluid.The volume of fluid(VOF)method was utilized to capture free surface waves,while a fully structured grid and the SST k-ωturbulence model were combined to solve the complex flow of submarines.Grid independence study in homogenous flow near the free surface was initially conducted.Furthermore,the hydrodynamic performance,wake evolution characteristics,free surface signatures as well as decay of velocity under different stratification levels were analyzed.Results demonstrated that the numerical method employed was efficient in simulating stratified flows.Moreover,it showed that density stratification had a significant impact on the hydrodynamics and wake characteristics of a submarine,especially under strong density stratification circumstances.

关键词： Wakes submarine free surface stratified fluid hydrodynamics

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Seabuckthorn Berries Extract Attenuates Pulmonary Vascular Hyperpermeability in Lipopolysaccharide-Induced Acute Lung Injury in Mice

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Chinese Journal of Integrative Medicine 2022年第12期28卷 1081-1087页

作者： DU Lei-lei LIU Ying wan Li CHEN Chu FAN gang School of Ethnic Medicine Chengdu University of Traditional Chinese MedicineChengdu 611137China School of Basic Medicine Chengdu UniversityChengdu 610106China School of Pharmacy Chengdu University of Traditional Chinese MedicineChengdu 611137China Sichuan Provincial Key Laboratory of Qualityand Innovation Research of Chinese Materia Medica Sichuan Academy of Chinese Medicine SciencesChengdu 610041China

Objective:To investigate the effect of seabuckthorn berries extract(SBE)on pulmonary vascular hyperpermeability in the mice model of acute lung injury(ALI)induced by lipopolysaccharide(LPS).Methods:Sixty Kunming mice were allocated into 6 groups by a random number table,including control,LPS,dexamethasone(Dex,1 mg/kg),and 120,240 and 480 mg/kg SBE groups,10 mice in each group.Except the control group,mice were pre-treated with Dex and SBE,respectively,for 7 days before LPS was intraperitoneally injected to induce ALl.Pulmonary vascular hyperpermeabilitywas evaluated by histopathologic observation and transvascular leakagedetermination.Tumor necrosis factor alpha(TNF-α)and interleukin-6(IL-6)levels in serum were measured using enzyme-linked immunosorbent assay.The expression of nuclear factor-kappa B(NF-k B)p65 in lung cells was determined by immunofluorescence analysis.The contents of cytoplasmic inhibitorof nuclear factor-kBkinase(IKK)and nuclearp65,as wellasdownstreamproteins of E-selectin(CD62E)and intercellular adhesion molecule-1(ICAM-1),were determined using Western blot analysis.Results:Histopathological observation confirmed SBEtreatment alleviatedmorphological lesion induced by LPS.Compared with the LPS group,480 mg/kg SBE significantly decreased the water content of lung,Evans blue accumulation in lung tissue,and protein concentration and neutrophils count in bronchoalveolar lavage fluid(P

关键词： seabuckthorn berries extract pulmonary vascular hyperpermeability acute lung injury nuclear factor-kappa B neutrophil

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Early Report of the Source Characteristics,Ground Motions,and Casualty Estimates of the 2023 Mw 7.8 and 7.5 Turkey Earthquakes

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Journal of Earth Science 2023年第2期34卷 297-303页

作者： Wenkai Chen gang Rao Dengjie Kang Zhifan wan Dun wang Lanzhou Institute of Seismology China Earthquake AdministrationLanzhou730000China School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500China State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan430074China

INTRODUCTION,At 01:17 UTC(04:17 on local time)on Feb.6,2023,a devastating earthquake with a moment magnitude(Mw)7.8 occurred in the Gaziantep,southern Turkey.The earthquake was located at 37.174°N and 37.032°E,with ... 详细信息

关键词： earthquake magnitude Earthquake

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