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Transforming nanoscale VO_(2)(B) into a scalable sodium-ion electrode

Nano Research 2024年第10期17卷 8809-8818页

作者： Yunkai Luo Swetha Chandrasekaran Bintao Hu randy chen Marcus Worsley Bruce Dunn Department of Materials Science and Engineering University of CaliforniaLos AngelesCA 90095USA Lawrence Livermore National Laboratory CA 94550USA

The intermittent nature of renewable energies requires highly reliable grid-level energy storage approaches.A critical consideration in developing this technology is the areal capacity which determines battery performance and influences the cost of battery *** related importance is finding new ways of developing scalable *** recent years,threedimensional(3D)printing of conductive scaffolds has emerged as an alternative to overcome the scalability limitations of commercial tape cast *** research carried out in the current study demonstrates a successful scalability pathway for nanoscale VO_(2)(B),a desirable cathode for sodium-ion batteries which has a nano-flower morphology with a crystallite size<20 *** electrodepositing VO_(2)(B)onto a graphene aerogel scaffold,we were able to achieve mass loading of over 100 mg·cm^(-2) and still possess an areal capacity of 10 mAh·cm^(-2) at a current density of 5 mA·cm^(-2).Moreover,after 1000 cycles,these electrodes retained 75% to 80% of their initial *** at high loading levels,the electrodeposited VO_(2)(B)exhibits pseudocapacitive material signatures such as a box-like voltammetry response,linear galvanostatic response,and no phase change upon *** scalability of the VO_(2)(B)electrode is demonstrated in a series of experiments which show the areal capacity to scale upon increase in both mass loading and electrode thickness,with only small changes in specific *** study establishes that nanoscale materials can be scaled up to achieve thick electrodes without compromising their electrochemical properties.

关键词： nano VO_(2)(B) sodium-ion battery scalable electrodes three-dimensional(3D)printed scaffold additive manufacturing

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Genetic diversity and population structure of Leptosphaeria maculans isolates in Western Canada

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Journal of Genetics and Genomics 2021年第11期48卷 994-1006页

作者： Qilin chen Gary Peng randy Kutcher Fengqun Yu Saskatoon Research and Development Centre Agriculture and Agri-Food CanadaSaskatoonCanada Department of Plant Sciences Crop Development CentreUniversity of SKSaskatoonSKCanada

Leptosphaeria maculans is a serious concern for canola production *** effective disease management,knowledge of the pathogen’s genetic variability and population structure is a *** this study,whole-genome sequencing was performed for 162 of 1590 *** isolates collected in the years 2007e2008 and 2012e2014 in Western *** variants in genome-wide and specific regions including avirulence(Avr)genes were characterized.A total of 31,870 high-quality polymorphic DNA variants were used to study *** genetic diversity and population *** analysis showed that 150 isolates were clustered into 2 main groups and 4 subgroups by DNA variants located in either Avr or small secreted protein-encoding genes and into 2 main groups and 6 subgroups by genome-wide *** analysis of nucleotide diversity and differentiation also confirmed genetic variation within a population and among *** component analysis with genome-wide variants showed that the isolates collected in 2012e2014 were more genetically diverse than those collected in *** structure analysis discovered three distinct *** isolates from Saskatchewan and Alberta were of similar genetic composition,Manitoba isolates were highly ***-wide association study detected DNA variants in genes AvrLm4-7,Lema_T86300,and Lema_T86310 associated with the years of collection.

关键词： Leptosphaeria maculans DNA variants Blackleg Genetic diversity Population structure

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Approximation Algorithms for Vertex Happiness

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Journal of the Operations Research Society of China 2019年第3期7卷 429-448页

作者： Yao Xu Yong chen Peng Zhang randy Goebel Department of Computing Science University of AlbertaEdmontonAB T6G 2E8Canada Department of Mathematics Hangzhou Dianzi UniversityHangzhou 310018China School of Computer Science and Technology Shandong UniversityJinan 250101China

We investigate the maximum happy vertices(MHV)problem and its complement,the minimum unhappy vertices(MUHV)*** order to design better approximation algorithms,we introduce the supermodular and submodular multi-labeling(SUP-ML and SUB-ML)problems and show that MHV and MUHV are special cases of SUP-ML and SUB-ML,respectively,by rewriting the objective functions as set *** convex relaxation on the I ovasz extension,originally presented for the submodular multi-partitioning problem,can be extended for the SUB-ML problem,thereby proving that SUB-ML(SUP-ML,respectively)can be approximated within a factorof2-2/k(2/k,respectively),where k is the number of *** general results imply that MHV and MUHV can also be approximated within factors of 2/k and 2-2/k,respectively,using the same approximation *** the MUHV problem,we also show that it is approximation-equivalent to the hypergraph multiway cut problem;thus,MUHV is Unique Games-hard to achieve a(2-2/k-e)-approximation,for anyε>*** the MHV problem,the 2/k-approximation improves the previous best approximation ratio max{1/k,1/(△+1/g(△)},where△is the maximum vertex degree of the input graph and g(△)=(√△+√△+1)2△>4△*** also show that an existing LP relaxation for MHV is the same as the concave relaxation on the Lovasz extension for SUP-ML;we then prove an upper bound of 2/k on the integrality gap of this LP relaxation,which suggests that the 2/k-approximation is the best possible based on this LP ***,we prove that it is Unique Games-hard to approximate the MHV problem within a factor of S2(log2 k/k).

关键词： Vertex happiness Multi-labeling Submodular/supermodular set function Approximation algorithm Polynomial-time reduction Integrality gap

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OsWRKY62 is a Negative Regulator of Basal and Xa21-Mediated Defense against Xanthomonas orvzae pv. orvzae in Rice

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Molecular Plant 2008年第3期1卷 446-458页

作者： Ying Peng Laura E. Bartley Xuewei chen Christopher Dardick Mawsheng Chern randy Ruan Patrick E. Canlas Pamela C. Ronald Department of Plant Pathology University of California Davis CA 95616 USA Present address: Monsanto Corporation Davis CA 95616 USA Present address: USDA-ARS Appalachian Fruit Research Station Kearneysville WV 25430 USA

The rice Xa21 gene, which confers resistance to the bacterial pathogen Xanthomonas oryzae pv. oryzae （Xoo）, encodes a receptor-like kinase, Few components involved in transducing the Xa21-mediated defense response have yet been identified. Here, we report that XA21 binds to a WRKY transcription factor, called OsWRKY62. The OsWRKY62 gene encodes two splice variants （OsWRKY62.1 and OsWRKY62.2）. OsWRKY62.1：smGFP2 and OsWRKY62.2：smGFP2 fusion pro- teins partially localize to the nucleus. Transgenic plants overexpressing OsWRKY62.1 are compromised in basal defense and Xa21-mediated resistance to Xoo. Furthermore, overexpression of OsWRKY62.1 suppresses the activation of defenserelated genes. These results imply that OsWRKY62 functions as a negative regulator of innate immunity in rice, and serves as a critical mediator of both basal and race-specific defense responses.

关键词： rice OsWRKY62 Xa21 defense response.

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Molecular signatures of soil-derived dissolved organic matter constrained by mineral weathering

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Fundamental Research 2023年第3期3卷 377-383页

作者： Ying-Hui Wang Peng Zhang chen He Jian-Chun Yu Quan Shi randy A.Dahlgren Robert G.M.Spencer Zhi-Bing Yang Jun-Jian Wang State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Shanghai Engineering Research Center of Hadal Science and Technology College of Marine SciencesShanghai Ocean UniversityShanghai 201306China Department of Land Air and Water ResourcesUniversity of California DavisDavis 95616United States Department of Earth Ocean and Atmospheric ScienceFlorida State UniversityTallahassee 32306United States

Dissolved organic matter(DOM)in soils drives biogeochemical cycling and soil functions in different directions depending on its molecular ***,there is a distinct paucity of information concerning how the molecular signatures of soil DOM vary with different degrees of weathering across wide geographic ***,we resolved the DOM molecular signatures from 22 diverse Chinese reference soils and linked them with soil organic matter and weathering-related mineralogical *** mixed-effects models revealed that the yields of DOM were determined by soil organic carbon content,whereas the molecular signature of DOM was primarily constrained by the weathering-related *** soil weathering index showed a positive effect on the lability and a negative effect on the aromaticity of ***,DOM in highly weathered acidic soils featured more amino sugars,carbohydrates,and aliphatics,as well as less O-rich polyphenols and condensed aromatics,thereby conferring a higher DOM biolability and lower DOM *** study highlights the dominance of the weathering-related dimension in constraining the molecular signatures and potential functions of DOM in soils across a wide geographic scale.

关键词： Soil organic matter Dissolved organic matter Chemical composition Molecular signature Mineral weathering

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基于地理加权回归模型评估土地利用对地表水质的影响

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环境科学学报 2015年第5期35卷 1571-1580页

作者：陈强朱慧敏何溶 randy A.Dahlgren 张明华梅琨温州医科大学浙南水科学研究院浙江省流域水环境与健康风险重点实验室温州325035 加州大学戴维斯分校农业与环境科学学院陆地、大气与水资源系美国戴维斯CA95616

针对传统线性回归模型大多忽视空间数据局部变化特征这一缺陷,引入地理加权回归模型(GWR)用于评估土地利用对地表水质的影响,分析了不同子流域内两者关系出现空间变化的规律并阐释了原因.同时,对比了GWR模型与普通最小二乘模型(OLS)的校... 详细信息

针对传统线性回归模型大多忽视空间数据局部变化特征这一缺陷,引入地理加权回归模型(GWR)用于评估土地利用对地表水质的影响,分析了不同子流域内两者关系出现空间变化的规律并阐释了原因.同时,对比了GWR模型与普通最小二乘模型(OLS)的校正R2、Akaike信息准则(AICc)及残差的空间自相关指数(Moran's I),验证了GWR模型在预测精度和处理空间自相关过程中是否优于OLS模型.结果表明,同一土地利用类型对水质的影响随空间位置的改变而发生方向或大小的变化.以温瑞塘河流域总氮(TN)与农用地的关系为例,从GWR模型局部回归系数的方向分析,两者关系表现为农村正、城区负的现象,从大小分析,旧城区TN与农用地回归系数的绝对值高于其它区域;在溶解氧(DO)与人口密度所构建的GWR模型中,两者关系在整个研究区域内均表现为负值,与OLS结果吻合,从回归系数的大小分析,人口密度对DO的作用在郊区及农村更为显著.针对此类关系出现空间变化的原因分析表明,相邻子流域土地利用百分比的改变及水体主要污染源的不同,是导致土地利用对水质作用发生变化的根本因素.最后,对比所构建的80个GWR与OLS模型校正R2、AICc指标,验证了GWR作为一种局部统计模型,其预测精度优于OLS等传统全局模型且更能反映实际空间特征.

关键词：地理加权回归土地利用水质 OLS 温瑞塘河

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A rare variant in COL11A1 is strongly associated with adult height in Chinese Han population

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Journal of Genetics and Genomics 2016年第9期43卷 549-554页

作者： Changbing Shen Xiaodong Zheng Jing Gao Caihong Zhu randy Ko Xianfa Tang Chao Yang Jinfa Dou Yan Lin Yuyan cheng Lu Liu Shuangjun Xu Gang chen Xianbo Zuo Xianyong Yin Liangdan Sun Yong Cui Sen Yang Xuejun Zhang Fusheng Zhou Institute and Department of Dermatology The First Affiliated Hospital Anhui Medical University The Key Laboratory of Dermatology Ministry of Education Anhui Medical University Collaborative Innovation Center for Complex and Severe Dermatosis Anhui Medical University Department of Dermatology The Second Affiliated Hospital Anhui Medical University Department of Biochemistry University of New Mexico Department of Genetics Renaissance Computing Institute University of North Carolina at Chapel Hill Department of Dermatology China-Japan Friendship Hospital

Human height is a highly heritable trait in which multiple genes are involved. Recent genome-wide association studies （GWASs） have identified that COL11A1 is an important susceptibility gene for hu- man height. To determine whether the variants of COL11A 1 are associated with adult and children height, we analyzed splicing and coding single-nucleotide variants across COL11A1 through exome-targeted sequencing and two validation stages with a total 20,426 Chinese Han samples. A total of 105 variants were identified by exome-targeted sequencing, of which 30 SNPs were located in coding region. The strongest association signal was chrl 103380393 with P value of 4.8 × 10-7. Chrl_103380393 also showed nominal significance in the validation stage （P = 1.21×10 6）. Combined analysis of 16,738 samples strengthened the original association of chrl 103380393 with adult height （Pcombinea - 3.1×10 8）, with an increased height of 0.292sd （standard deviation） per G allele （95% CI： 0.19-0.40）. There was no evidence （P = 0.843） showing that chrl 103380393 altered child height in 3688 child samples. Only the group of 12-15 years showed slight significance with P value of 0.0258. This study firstly shows that genetic variants of COL11A1 contribute to adult height in Chinese Han population but not to children height, which expand our knowledge of the genetic factors underlying height variation and the biological regulation of human height.

关键词： Rare variant COL11A1 Adult height Chinese Han population

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基于GIS栅格数据的城市河网水质综合评价模型构建

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环境与健康杂志 2015年第1期32卷 54-58,F0003页

作者：朱慧敏陈强王振峰任坤何溶 randy A Dahlgren 张明华温州医科大学水环境应用技术研究所浙南水科学研究院浙江温州325035 美国加州大学戴维斯分校陆地大气与水资源系

目的建立基于GIS栅格数据的城市河网水质综合评价模型。方法该文章利用温瑞塘河流域32个水质监测点2008年至2010年水质监测数据,采用一种基于GIS栅格的指数模型对城市河网水质进行多因子综合评价,并根据GB3838—2002《地表水环境质量标... 详细信息

目的建立基于GIS栅格数据的城市河网水质综合评价模型。方法该文章利用温瑞塘河流域32个水质监测点2008年至2010年水质监测数据,采用一种基于GIS栅格的指数模型对城市河网水质进行多因子综合评价,并根据GB3838—2002《地表水环境质量标准》对评价结果进行水质等级分类。通过对比分类结果与实际情况来探讨该种水质评价方法的评价效果以及栅格指数模型在温瑞塘河的适用性。结果温瑞塘河流域温州市区河网部分水质较差,大部分区域属于劣Ⅴ类水质,水质综合整治仍需加强;氨氮、总磷为温瑞塘河的主要污染物;塘河水质综合污染状况呈现城市重于郊区农村、旧城区重于新城区、支流重于干流的空间分布特征;GIS指数模型在温瑞塘河流域水质评价的结果与实际水质状况高度吻合。结论该方法具有可行性,适用于城市河网水质评价。

关键词：水质评价 GIS指数模型温瑞塘河

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汉语讲话者辨别方法研究

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模式识别与人工智能 1998年第1期11卷 62-66页

作者：林宝成陈永彬东南大学无线电工程系南京210096

根据讲话者在讲话时鼻腔相对固定以及汉语鼻音声母少(只有m-和n-两种)的特点,使用极零模型,并以所有汉语鼻声母音节的零点谱为参数,实现汉语讲话者辨别.所选择的参数稳定、有效,系统模板存储量少.系统训练和识别的运算量小,其规模在20... 详细信息

根据讲话者在讲话时鼻腔相对固定以及汉语鼻音声母少(只有m-和n-两种)的特点,使用极零模型,并以所有汉语鼻声母音节的零点谱为参数,实现汉语讲话者辨别.所选择的参数稳定、有效,系统模板存储量少.系统训练和识别的运算量小,其规模在20个人时的性能为:用各个人所有单个声母测试时.首选总正识率为67.02%;随机地用3,4,5个声母平均后测试时,则首选正识率分别可达93.33%、96.7%、98.3%.

关键词：讲话者识别鼻音声母极零模型语音信号处理

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细胞的囊泡运输机制——浅释2013年诺贝尔生理学或医学奖

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科技导报 2013年第34期31卷 22-23页

作者：张晨周专北京大学生命科学学院北京100871 北京大学分子医学研究所北京100871

2013年诺贝尔医学生理学奖授予randy Schekman、James Rothman和Thomas Südhof 3位科学家,以表彰他们在细胞的囊泡运输机制方面做出的重大贡献。本文将简述这3位科学家的获奖工作,以及这一发现如何扩展了人类对大自然的了解。

关键词： 2013年诺贝尔生理学或医学奖细胞囊泡运输

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