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Effects of coal-fired power plants on soil microbial diversity and community structures

Journal of Environmental Sciences 2024年第3期137卷 206-223页

作者： Bowen Sun Renbin Zhu Yu Shi Wanying Zhang zeming zhou Dawei Ma Runfang Wang Haitao Dai Chenshuai Che Institute of Polar Environment&Anhui Key Laboratory of Polar Environment and Global Change School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 450046China State Grid Anhui Electric Power Research Institute Hefei 230601China

Long-term deposition of atmospheric pollutants emitted from coal combustion and their effects on the eco-environment have been extensively studied around coal-fired power ***,the effects of coal-fired power plants on soil microbial communities have received little attention through atmospheric pollutant deposition and ***,we collected the samples of power plant soils(PS),coal-stacking soils(CSS)and agricultural soils(AS)around three coal-fired power plants and background control soils(BG)in Huainan,a typical mineral resource-based city in East China,and investigated the microbial diversity and community structures through a high-throughput sequencing ***-stacking significantly increased(p<0.05)the contents of total carbon,total nitrogen,total sulfur and Mo in the soils,whereas the deposition of atmospheric pollutants enhanced the levels of V,Cu,Zn and ***,Actinobacteria,Thaumarchaeota,Thermoplasmata,Ascomycota and Basidiomycota were the dominant taxa in all *** bacterial community showed significant differences(p<0.05)among PS,CSS,AS and BG,whereas archaeal and fungal communities showed significant differences(p<0.01)according to soil samples around three coal-fired power *** predominant environmental variables affecting soil bacterial,archaeal and fungal communities were Mo-TN-TS,Cu-V-Mo,and organic matter(OM)-Mo,*** soil microbial genera were closely related to multiple key factors associated with stacking coal and heavy metal deposition from power *** study provided useful insight into better understanding of the relationships between soil microbial communities and long-term disturbances from coal-fired power plants.

关键词： Coal-fired power plants Soil microbial communities Coal-stacking Heavy metals Environmental variables

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Model-based variational fusion for reducing spectral distortion

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Science China(Information Sciences) 2018年第1期61卷 267-269页

作者： zeming zhou Chaoqian CHEN Yong MENG Biao HU Institute of Meteorology and Oceanography PLA University of Science and Technology

High-resolution remote sensing satellites such as IKONOS,Quick Bird,and Geo Eye-1 usually provide a panchromatic(PAN)band and four multispectral(MS)*** sharpening is the synthesis of MS images of high spatial and spectral resolution with the spatial detail extracted from PAN *** this article,we present a model-based variational method for reducing the

关键词： IKONOS MS TVR IHS

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Variational PCA fusion for Pan-sharpening very high resolution imagery

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Science China(Information Sciences) 2014年第11期57卷 100-109页

作者： zhou zeming MA Ning LI YuanXiang YANG PingL ZHANG Peng LI YunYing Institute of Meteorology and Oceanography PLA University of Science and Technology School of Aeronautics Shanghai JiaoTong University

The Pan-sharpening approach based on principle component analysis(PCA) is affected by severe spectral distortion. To address this problem, a new pan-sharpening model based on PCA and variational technique is proposed to construct the substitute image of the first principal component(PC1). The energy functional consists of three terms. The first term injects PC1 with the geometric structure of the panchromatic(Pan) image. The second term preserves the spectral pattern of the multi-spectral image in the merged *** the third term guarantees the smoothness of the functional optimization solution. The fusion result is given by the minimum of the energy functional, which is computed with the gradient descend flow. The experiments on QuickBird and IKONOS datasets validate the effectiveness of the proposed model. Compared with the stateof-the-art pan-sharpening approaches, this model exhibits a better trade-off between improving spatial quality and preserving spectral signature of the MS image.

关键词： PCA variational PCA fusion remote sensing image pan-sharpening gradient descend flow

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Improving hydrogen storage thermodynamics and kinetics of Ce-Mg-Ni-based alloy by mechanical milling with TiF_(3)

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Journal of Magnesium and Alloys 2024年第4期12卷 1593-1607页

作者： Hongwei Shang Wei Zhang Xin Wei Yaqin Li zeming Yuan Jun Li Yanghuan Zhang School of Mechanical and Electrical Engineering Chuzhou UniversityChuzhou 239000China Department of Functional Material Research Central Iron and Steel Research InstituteNo.76 Xueyuannan RoadHaidian DistrictBeijing 100081China Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China China Rare Earth New Material(Weishan)Co. Ltd.Jining 277600China

Mg-based hydrides are too stable and the kinetics of hydrogen absorption and desorption is not *** efficient way to improve these shortcomings is to employ reactive ball milling to synthesize the nanocomposite materials of Mg and *** this experiment,TiF_(3)was selected as an additive,and the mechanical milling method was employed to prepare the experimental *** alloys used in this experiment were the as-cast Ce_(5)Mg_(85)Ni_(10),as-milled Ce_(5)Mg_(85)Ni_(10)and Ce_(5)Mg_(85)Ni_(10)+3 wt.%*** phase transformation,structural evolution,isothermal and non-isothermal hydrogenation and dehydrogenation performances of the alloys were inspected by XRD,SEM,TEM,Sievert apparatus,DSC and *** revealed that nanocrystalline appeared in the as-milled *** with the as-cast alloy,ball milling made the particle dimension and grain size decrease dramatically and the defect density increase *** addition of TiF_(3)made the surface of ball milling alloy particles markedly coarser and more *** milling and adding TiF_(3)distinctly improved the activation and kinetics of the ***,ball milling along with TiF_(3)can decrease the onset dehydrogenation temperature of Mg-based hydrides and slightly ameliorate their thermodynamics.

关键词： Mg-based hydrides TiF_(3) Ball milling Thermodynamics Kinetics

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Effect of Ball Milling Time on Microstructure and Hydrogen Storage Properties of Nd5Mg41Ni Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1201-1214页

作者： zeming Yuan Chenxu Liu Xiaoming Li Yongqi Sui Zhonggang Han Tingting Zhai Dianchen Feng Yanghuan Zhang Instrumental Analysis Center Inner Mongolia University of Science and TechnologyBaotou014010China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing100081China

Mg-based alloys must be dehydrogenated at high pressure and temperatures, limiting their practical application. In this paper, Nd_(5)Mg_(41)Ni alloy was prepared by vacuum melting, and the as-cast alloy was ball milled for 5 h, 10 h, 15 h, and 20 h. The effect of ball milling time on the microstructure and hydrogen storage properties of the alloy was systematically studied. The alloy comprises Nd_(5)Mg_(41), NdMg_(12), NdMg_(3), and Mg_(2)Ni phases. The Nd_(5)Mg_(41)Ni alloy milling for 10 h can reach 95% of the saturated hydrogen absorption at 553 K by 40 s, and the alloy can desorb hydrogen only by 20 min. The dehydrogenation activation energy is only 99.9 kJ/mol H_(2). Ball milling makes the alloy produce many nanocrystalline and amorphous structures. The nano-grain boundary provides a channel for the diffusion of hydrogen atoms, and the high energy at the grain boundary provides energy for the phase deformation nucleus. Ball milling leads to the refinement of alloy particles and shortens the diffusion distance of hydrogen atoms to the interior of alloy particles. Defects such as twins and dislocations generated by milling provide energy for the phase deformation nucleus during the hydrogen absorption and desorption.

关键词： Hydrogen storage materials Magnesium-base alloy Ball milling Nanocrystal Kinetics

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Routing and scheduling co-design for holistic software-defined deterministic network

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Fundamental Research 2024年第1期4卷 25-34页

作者： Jinglong Zhang Fengyuan Zhu zeming Yang Cailian Chen Xiaohua Tian Xinping Guan School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

As a result of the growing complexity of industrial Internet applications,traditional hardware-based network designs are encountering challenges in terms of programmability and dynamic adaptability as they struggle to meet the real-time,high-reliability transmission requirements for the vast quantities of data generated in industrial *** paper proposes a holistic software-defined deterministic network(HSDDN)design *** solution uses a centralized controller to implement a comprehensive software definition,ranging from the network layer down to the physical *** the wireless access domain,we decouple the standard radio-frequency modules from baseband processing to realize a software-defined physical layer,which then allows us to adjust the data transmission cycles and tag the trigger rates to meet demand for low-power,high-concurrency *** the wired network domain,we integrate software-defined networking with time-sensitive networking and propose a coordinated design strategy to address routing and the deterministic scheduling *** define a set of constraints to ensure collaborative transmission of the periodic and aperiodic data *** guarantee load balancing across all paths and timeslots,we introduce the Jain’s fairness index as the optimization objective and then construct a nondeterministic polynomial-time(NP)-hard joint optimization ***,an algorithm called Tabu search for routing and scheduling with dual-stages(TSRS-DS)is *** experiments demonstrate the effectiveness of the proposed HSDDN architecture.

关键词： Deterministic networking Software-defined networking Software-defined physical layer Time-sensitive networking Backscatter communication Routing and scheduling co-design

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Classical spin liquid state in a rhombic lattice metal-organic framework

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Nano Research 2024年第4期17卷 3407-3412页

作者： Sihua Feng Chao Wang Jiyin Zhao Xuguang Liu Chaocheng Liu zeming Qi Lei Chen Huijuan Wang Minghui Fan Hengli Duan Wensheng Yan National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Experimental Center of Engineering and Material Science University of Science and Technology of ChinaHefei 230026China

Discovering more and new geometrically frustrated systems remains an active point of inquiry in fundamental physics for the existence of unusual states of ***,we report spin-liquid-like behavior in a two-dimensional(2D)rhombic lattice Fe-metal-organic framework(Fe-MOF)with frustrated *** Fe-MOF exhibits a high frustration factor f=|θCW|/TN≥315,and its long-range magnetic order is suppressed down to 180 *** theoretical calculations demonstrate strong antiferromagnetic coupling between adjacent Fe3+ions,indicating the potential of a classical spin-liquid-like ***,a T-linear heat capacity parameter,γ,originating from electronic contributions and with magnetic field independence up to 8 T,can be observed in the specific heat capacity measurements at low-temperature,providing further proof for the spin-liquid-like *** work highlights the potential of MOF materials in geometrically frustrated systems,and will promote the research of exotic quantum physics phenomena.

关键词： spin-liquid-like state two-dimensional metal-organic framework(2D MOF) rhombic lattice ultralow temperature(ULT)measurements spin-frustrated

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Sodium Abundances in Very Metal-poor Stars

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Research in Astronomy and Astrophysics 2023年第7期23卷 229-246页

作者： Yu-Fu Shen S.A.Alexeeva Gang Zhao Shuai Liu zeming zhou Hongliang Yan Haining Li Tianyi Chen Xiaodong Xu Huiling Chen Huawei Zhang Jianrong Shi CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Department of Astronomy School of PhysicsPeking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

Chemical composition of very metal-poor(VMP)stars can provide observational constraints on current models of nucleosynthesis and the chemical evolution of the *** has been found that the scatter of[Na/Fe]versus[Fe/H]in VMP stars is very large in contrast with most other ***,a negative slope in[Na/Fe]versus[Fe/H]was found for giants,which is very unlikely according to the theory of *** the sample of93 VMP stars in the metallicity range-4.25<[Fe/H]<-1.64 we obtained NLTE sodium abundances using the line profile fitting method by employing accurate atmospheric parameters determined when taking into account NLTE line formation for both FeⅠand FeⅡ.Originally selected from the LAMOST low-resolution spectral database,the spectra of stars were obtained with the High Dispersion Spectrograph of the Subaru *** 57turn-off stars in metallicity domain-3.04<[Fe/H]<-1.64,we obtained mean[Na/Fe]=-0.29±0.14 and positive slope 0.09±*** 21 giants distributed over metallicity-3.59<[Fe/H]<-2.19,we found mean[Na/Fe]=-0.35±0.1 and positive slope 0.07±***[Na/Fe]trend is lower by~0.2 dex,compared to the modern GCE *** believe the GCE model should be adjusted,by considering the associated *** stars in our sample are found to be outliers,with too low or too high Na abundances.

关键词： techniques:spectroscopic stars:abundances stars:atmospheres

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基于微波链路的天气雷达降水场校准方法

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气象 2023年第2期49卷 157-169页

作者：张鹏刘西川周则明宋堃杨平吕陆军工程大学教研保障中心南京210014 国防科技大学气象海洋学院长沙410005

为减小天气雷达反演降水场与地面实际降水的偏差,提出了利用贴近地面的微波链路对天气雷达降水场实施校准的方法,包括变分校准法、卡尔曼滤波校准法、平均校准法和克里金校准法。为验证校准效果,在两次不同类型的实际降水过程中,利用两... 详细信息

为减小天气雷达反演降水场与地面实际降水的偏差,提出了利用贴近地面的微波链路对天气雷达降水场实施校准的方法,包括变分校准法、卡尔曼滤波校准法、平均校准法和克里金校准法。为验证校准效果,在两次不同类型的实际降水过程中,利用两条微波链路,对S波段天气雷达反演的降水场进行了校准,校准结果与地面雨量计实测值进行了比较,结果表明:四种校准方法均取得了一定的校准效果,改善了降水过程Ⅰ中强降水的低估问题和过程Ⅱ中弱降水的高估问题。校准后的雨强分布与雨量计测值的一致性得到提升,统计误差明显降低,改善程度由高至低依次为平均误差、均方根误差、平均绝对误差。综合各种校准方法在两次降水过程中的表现,克里金校准法的效果相对较好,变分校准法和平均校准法的效果优于卡尔曼滤波校准法。对平均误差和均方根误差改善幅度最大的是克里金校准法,对平均绝对误差改善幅度最大的为变分校准法。平均校准法和卡尔曼滤波校准法得到的校准因子为某一时次的区域平均校准因子,而克里金校准法和变分校准法能够得到随时间和空间位置变化的校准因子场。研究结果表明微波链路是校准雷达降水场的有效手段。

关键词：定量测量降水校准微波链路天气雷达

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查理一世之死与斯图亚特复辟王朝的记忆政治

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世界历史 2024年第3期 98-111,165,166页

作者：苏泽明聊城大学历史文化与旅游学院

斯图亚特王朝复辟后,以查理一世之死为核心的内战记忆受到了政治力量左右。为了修复国家的裂痕,复辟王朝采取“有限遗忘”或“选择记忆”策略,将查理一世之死定义为少数野心家发动叛乱导致的弑君事件,君之罪应由克伦威尔等少数叛贼承担... 详细信息

斯图亚特王朝复辟后,以查理一世之死为核心的内战记忆受到了政治力量左右。为了修复国家的裂痕,复辟王朝采取“有限遗忘”或“选择记忆”策略,将查理一世之死定义为少数野心家发动叛乱导致的弑君事件,君之罪应由克伦威尔等少数叛贼承担。查理一世被宣传成为国家和国教赴死的殉道者,是不容置疑的合法性权威。复辟王朝以政权力量塑造的查理一世之死记忆与詹姆士二世的继位诉求相匹配,助其顺利登上了王位。然而,查理一世为国教道的记忆与詹姆士二世推行天主教的政策之间存在明显冲突,最终成为辉格党发动光荣革命的借口。复辟王朝以查理之死为中心,构建了一种极度简化的集体记忆,试图主导民众的记忆内容,却只能暂时压制矛盾和仇恨,最终导致局面失控。这种高度政治化的集体记忆有利于初步实现民族和解,但其过度依赖单一叙事,缺乏包容性和变通性的特点,使它难以与动荡的政治局势相适应,反而使记忆塑造者落入自设的合法性陷阱。

关键词：查理一世斯图亚特王朝记忆政治集体记忆光荣革命

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