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Evaluation of the performance of alternative assessment configurations to account for the spatial heterogeneity in age-structure: a simulation study based on Indian Ocean albacore tuna

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Acta Oceanologica Sinica 2019年第10期38卷 9-19页

作者： Wenjiang Guan jiawen wu Siquan Tian College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of EducationShanghai 201306China

Various population structures or spatial heterogeneities in population distribution have been an important source of model misspecification and have had an impact on estimation performance in fisheries stock *** this study,we simulated the Indian Ocean albacore spatial heterogeneity in age-structure using Stock Synthesis according to the stage-dependent migration rate and region-dependent fishing mortality rate and generated the stock assessment *** on these data,we investigated the performances of different spatial configurations,selectivity curves and selections of CPUE(catch per unit effort)indices of the assessment models which were used to account for spatial *** results showed:(1)although the spatially explicit configurations,which exactly matched the operating model,provided unbiased and accurate estimates of relative spawning biomass,relative fishing mortality rate and maximum sustainable yield in all simulation scenarios,their performance may be very poor if there were mismatches between them and the operating model due to gaps in knowledge and data;(2)for spatially explicit assessment configuration,the correct boundary was required,but for non-spatially explicit assessment configuration,it seemed more important for analysts to partition the area to properly reflect the transition in field data and to effectively account for the impacts of ignoring the spatial structure by using the additional spatially referenced parameters;(3)although the areas-as-fleets methods and flexible time-varying selectivity curves could be used as better alternative approaches to account for spatial structure,these configurations could not completely eliminate the impacts of model misspecification and the quality of estimates of different quantities from the same assessment model may be inconsistent or the performance of the same assessment configuration may fluctuate significantly between simulation scenarios;(4)although the worst estimates could g

关键词： spatial structure simulation stock assessment Indian Ocean Thunnus alalunga

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Active plane modulation of Bi_(2)O_(3)nanosheets via Zn substitution for efficient electrocatalytic CO_(2)reduction to formic acid

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Nano Research 2023年第8期16卷 10803-10809页

作者： Yumei Liu Tiantian wu Hongfei Cheng jiawen wu Xiaodong Guo Hong Jin Fan College of Chemical Engineering Sichuan UniversityChengdu 610065China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore School of Chemistry Xi’an Key Laboratory of Sustainable Energy Materials ChemistryState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China Institute of Materials Research and Engineering A*STAR2 Fusionopolis WaySingapore 138634Singapore

Formic acid is considered one of the most economically viable products for electrocatalytic CO_(2)reduction reaction(CO_(2)RR).However,developing highly active and selective electrocatalysts for effective CO_(2)conversion remains a grand ***,we report that structural modulation of the bismuth oxide nanosheet via Zn^(2+)cooperation has a profound positive effect on exposure of the active plane,thereby contributing to high electrocatalytic CO_(2)RR *** obtained Zn-Bi_(2)O_(3)catalyst demonstrates superior selectivity towards formate generation in a wide potential range;a high Faradaic efficiency of 95%and a desirable partial current density of around 20 mA·cm^(-2)are obtained at−0.9 V(*** hydrogen electrode(RHE)).As proposed by density functional theory calculations,Zn substitution is the most energetically feasible for forming and stabilizing the key OCHO*intermediate among the used metal ***,the more negative adsorption energy of OCHO*and the relatively low energy barrier for the desorption of HCOOH*are responsible for the enhanced activity and selectivity.

关键词： electrocatalytic CO_(2)reduction Bi_(2)O_(3)catalyst active plane modulation Zn substitution high selectivity

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GPU-BASED FLUID SIMULATION WITH FAST COLLISION DETECTION ON BOUNDARIES

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International Journal of Modeling, Simulation, and Scientific Computing 2012年第1期3卷 137-148页

作者： jiawen wu FENGQUAN ZHANG XUKUN SHEN State Key Laboratory of Virtual Reality Technology and System Beihang University 100191 BeijingChina

In this paper,we present a method for fluid simulation based on smoothed particle hydrodynamic(SPH)with fast collision detection on boundaries on *** major goal of our algorithm is to get a fast SPH simulation and rendering on ***,our algorithm has the following three features:At first,to make the SPH method GPU-friendly,we introduce a spatial hash method for neighbor *** sorting the particles based on their grid index,neighbor search can be done quickly on ***,we propose a fast particle-boundary collision detection *** precomputing the distance field of scene boundaries,collision detection’s computing cost arrived as O(n),which is much faster than the traditional ***,we propose a pipeline with fine-detail surface reconstruction,and progressive photon mapping working on *** experiment our algorithm on different situations and particle numbers of scenes,and find out that our method gets good *** experimental data shows that we can simulate 100K particles,and up to 1000K particles scene at a rate of approximately 2 times per second.

关键词： SPH simulation fast collision detection GPU progressive photon mapping

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Effect of diagenetic variation on the static and dynamic mechanical behavior of coral reef limestone

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International Journal of Mining Science and Technology 2024年第7期34卷 893-908页

作者： Linjian Ma Jiajun Deng Mingyang Wang Jianping Wang Bin Fang jiawen wu State Key Laboratory of Explosion&Impact and Disaster Prevention&Mitigation Army Engineering University of PLANanjing 210007China Naval Research Institute Beijing 100070China

Coral reef limestone at different depositional depths and facies differ remarkably on the textural and mineralogical characteristics,owing to the complex sedimentary *** explore the effects of pore structure and mineral composition associated with diagenetic variation on the mechanical behavior of reef limestone,a series of quasi-static and dynamic compression tests along with microscopic examinations were performed on the reef limestone at shallow and deep burial *** is revealed that the shallow reef limestone(SRL)is classified as a porous aragonite-type carbonate rock with high porosity(55.3±3.2)%and pore *** comparison,the deep reef limestone(DRL)is mainly composed of dense calcite-type calcium carbonate with low porosity(4.9±1.6)%and pore *** DRL strengthened and stiffened by the tight grain framework consistently displays much higher values of the dynamic compressive strength,elastic modulus,brittleness index,and specific energy absorption than those of the *** gap between two types of limestone further increases with an increase in strain *** appears that the failure pattern of SRL is dominated by the inherent defects like weak bonding interfaces and growth lines,revealed by the intricate fracturing network and mixed ***,although the preexisting megapores in DRL may affect the crack propagation on pore tips to a certain distance,it hardly alters the axial splitting failure of DRL under *** stress wave propagation and attenuation in SRL is primarily controlled by the reflection and diffusion caused by plenty mesopores,as well as an energy dissipation in layer-wise pore collapse and adjacent grain crushing,while the stress wave in DRL is highly hinged on the insulation and diffraction induced by the isolated *** process is accompanied by the energy dissipation behavior of inelastic deformation resulted from the pore-emanated microcracking.

关键词： Reef limestone Dynamic behavior Mineral composition Pore structure Wave propagation Energy dissipation

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Structural engineering of Fe single-atom oxygen reduction catalyst with high site density and improved mass transfer

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Journal of Energy Chemistry 2024年第11期98卷 634-644页

作者： jiawen wu Yuanzhi Zhu An Cai Xiaobin Fan Wenchao Peng Yang Li School of Chemical Engineering and Technology Tianjin UniversityTianjin 300354China Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in PhosphorusChemical Engineering and New Phosphorus MaterialsKunming University of Science and TechnologyKunming 650500YunnanChina Institute of Shaoxing Tianjin UniversityShaoxing 312300ZhejiangChina

Fe-N-C catalysts are widely considered as promising non-precious-metal candidates for electrocatalytic oxygen reduction reaction(ORR),Yet despite their high catalytic activity through rational modulation,challenges remain in their low site density and unsatisfactory mass transfer ***,we present a structural engineering approach employing a soft-template coating strategy to fabricate a hollow and hierarchically porous N-doped carbon framework anchored with atomically dispersed Fe sites(FeNCh) as an efficient ORR *** combination of hierarchical porosity and high exterior surface area is proven crucial for exposing more active sites,which gives rise to a remarkable ORR performance with a half-wave potential of 0.902 V in 0.1 m KOH and 0.814 V in 0.1 m HClO_(4),significantly outperforming its counterpart with solid structure and dominance of micropores(FeNC-s).The mass transfer property is revealed by in-situ electrochemical impedance spectroscopy(EIS) *** distribution of relaxation time(DRT) analysis is further introduced to deconvolve the kinetic and mass transport processes,which demonstrates an alleviated mass transport resistance for FeNC-h,validating the effectiveness of structural *** work not only provides an effective structural engineering approach but also contributes to the comprehensive mass transfer evaluation on advanced electrocatalyst for energy conversion applications.

关键词： Single-atom catalysts Oxygen reduction reaction Structural engineering Active site density Mass transfer Zinc-air batteries

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Cloning,expression and characterization of three Ribosomal Protein S13 genes in Sophora flavescens

Cloning,expression and characterization of three Ribosomal P...

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华东地区生物化学与分子生物学学会联合会2017年学术交流会暨安徽省生物化学与分子生物学学会理事会议

作者： Yi Liao jiawen wu Anhui University of Traditional Chinese Medicine

Objective To characterize the structure and function of ribosomal protein S13(RPS13 s),we identified three full-length ORFs of RPS13 genes(RPS13-1,RPS13-2 and RPS13-3) from a Chinese medicinal plant Sophora *** The target genes were amplified by Reverse Transcription-Polymerase Chain Reaction(RT-PCR),ligated into pET22 b(+)vector,then transformed into Escherichia coli BL21 competent cells for protein *** physicochemical properties,protein motif,evolution and structures of the three RPS13 s were analyzed by bioinformatics *** The full-length ORFs(453 bp) of the three S13 genes were cloned from Sophora flavescens,each encoding a protein with 151 amino acids,and the expression of the three RPS13 s were successfully detected by *** analysis showed that RPS13 s are stable proteins and they have the closest relationship with 40 S RPS13 s from Elaeis *** three dimensional structures had three a-helixes in C-terminal and four a-helixes in N-terminal,and the two clusters of helices were connected by a long random coil,which may help to maintain the dynamic bridging interactions between the large and small subunits of *** The three full-length ORFs of RPS13 genes from Sophora flavescens were successfully cloned and expressed in *** study of the physicochemical properties,evolution,secondary and three-dimensional structures of the three proteins will provide the theoretical basis for further study the function of RPS13 s in plants.

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Bilirubin inhibits lung carcinogenesis by up-regulating cystatin A expression in tumor-infiltrating macrophages

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Genes & Diseases 2023年第6期10卷 2222-2225页

作者： Qingtian Huang Na Zhang Jiangtuan Wang Hua Xu Leyi Yao Qianqian Yang Ding Yan Xi Chen Qian Xue Min Xiao jiawen wu Xueheng wu Qin Liu Daolin Tang Xin Chen Xiaofen Li Jinbao Liu Affiliated Cancer Hospital&Institute of Guangzhou Medical University GuangzhouGuangdong 510095China Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation School of Basic Medical SciencesGuangzhou Medical UniversityGuangzhouGuangdong 511436China Institute of Digestive Disease The Sixth Affiliated Hospital of Guangzhou Medical UniversityQingyuan People's HospitalQingyuanGuangdong 511518China Department of Pathology Dongguan People's Hospital Affiliated to Southern Medical UniversityDongguanGuangdong 523059China Department of Surgery UT Southwestern Medical CenterDallasTX 75390USA

As one of the leading causes of cancer deaths worldwide,the pathogenesis of lung cancer is still not completely ***,a product of heme metabolism,has long been considered a waste product of the *** evidence suggests that bilirubin has additional antioxidant,anti-inflammatory,and proteasome inhibitory ***,the specific role of bilirubin in the formation and development of lung cancer has not been elucidated.

关键词： lung metabolism cancer

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基于统计的灰度视频自适应背景建模算法

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中国激光 2021年第3期48卷 107-119页

作者：武加文王世勇中国科学院上海技术物理研究所红外探测与成像技术重点实验室上海200083 中国科学院大学北京100049

针对灰度视频的目标检测依赖先验知识、召回率低以及单一算法无法同时兼顾静态与动态背景等问题,提出一种基于统计的背景建模算法。该算法无需先验知识,根据统计信息可以准确区分静态背景和动态背景,并采取不同的检测策略提取目标。对... 详细信息

针对灰度视频的目标检测依赖先验知识、召回率低以及单一算法无法同时兼顾静态与动态背景等问题,提出一种基于统计的背景建模算法。该算法无需先验知识,根据统计信息可以准确区分静态背景和动态背景,并采取不同的检测策略提取目标。对于静态背景,采用改进的三帧差分法自适应设置阈值,可以保证较高的召回率。对于动态背景,采用改进的概率密度估计法可以有效降低虚警率。采用所提算法对光照变化以及阴影进行处理,可以进一步提升算法的性能。在公开数据集与实际采集红外数据进行验证实验。实验结果表明,所提算法在多种场景中处理灰度视频的结果比其他传统算法好,在保证准确率的同时可以极大地提升召回率,并且有效提高目标的完整性。

关键词：机器视觉运动目标检测背景建模自适应阈值光照变化

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Impact of air pollution on urbanization:evidence at China’s city level

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Chinese Journal of Population,Resources and Environment 2024年第3期22卷 268-274页

作者： Yanchun Yi Yixin Geng jiawen wu Yinling Liu School of Economics&Management Huzhou CollegeHuzhou 313000China School of Economics and Management Hubei Normal UniversityHuangshi 435002China

This paper investigates the effect and transmission mechanism of air pollution on urbanization based on data from China’s 107 cities during 2005–*** order to identify the impact of air pollution on China’s urbanization,we utilized night light data to represent the level of urbanization and used temperature inversion as an instrumental variable to mitigate endogeneity within the two-stage least squares *** results suggest that air pollution significantly slowed China’s urbanization process with economic growth acting as the transmission *** heterogeneity analyses revealed that air pollution had a greater negative impact on urbanization in northern regions than that in southern regions,and a greater negative impact in resource-oriented cities than that in non-resource-based *** also find that air pollution was to the detriment of urbanization in larger cities,which have more than 3 million residents,while it did not have a significant impact on Type II large cities,which have fewer than 3 million residents.

关键词： Air pollution Urbanization Influencing mechanism 2SLS Night light data Instrumental variable

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De novo assembly and analysis of Artemisia argyi transcriptome and identification of genes involved in terpenoid biosynthesis

De novo assembly and analysis of Artemisia argyi transcripto...

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华东地区生物化学与分子生物学学会联合会2017年学术交流会暨安徽省生物化学与分子生物学学会理事会议

作者： Miaomiao Liu Jinhang Zhu jiawen wu Meiqi Zhou Anhui University of Chinese Medicine Anhui Medical University

Artemisia argyi *** Vant.,a common ancient compositae species,is widely distributed in *** leaf of Artemisia argyi(***) is used extensively in medical application with a long history as a traditional Chinese *** underlying mechanism of terpenoid biosynthesis in leaf has been suggested to play an important role in this ***,there is limited available genetic studies on this *** non-model organisms that lack existing genomes as references,RNA-seq is a best means to screening functional genes and evaluating expression ***,we performed RNA-seq in leaf,root and stem tissues to identify all possibly transcribed genes and about 87.10 million lllumina reads of each tissue were de novo assembled to establish the *** transcriptome for the first *** assembled a total of 99,807 unigenes by analysing the expression profiling which were generated from the three tissues and 67,446 unigenes were annotated from public databases including Nr,Nt,GO,KEGG,COG,Swissprot and *** further performed differential gene expression analysis between leaf with stem and root *** findings revealed that a total of7,725 unigenes were specified transcribed in leaf which used as the main medicinal part of the *** particular,105 unigenes encoding 14 key enzymes that control the terpenoid biosynthesis were discovered,including AACT,HMGS,HMGR MK,PMK,MVD,DXS,DXR,CMS,CMK,MCS,HDS,HDR,and *** unigenes are distributed in MVP pathway(62 unigenes,6 enzymes) and MEP/DOXP pathway(43 unigenes,8 enzymes),which are responsible for precursor substances synthesized in ***,we have successfully cloned 6 key enzymes(HMGR,MVD,DXS,DXR,HDS,HDR) and this result verified the correctness of *** biosynthesis of terpenoid may greatly improve the yield of active ingredients in *** by means of gene regulation to strengthen the expression levels of key enzymes and leaf with stronger drug activity may be produced for clinical

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