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Spatial variability of soil chemical properties of Moso bamboo forests of China

Journal of Forestry Research 2021年第6期32卷 2599-2608页

作者： Regassa Terefe kun-yong yu Yangbo Deng Xiong Yao Fan Wang Jian liu University Key Laboratory of Technology and Optimize Resource Utilization in Fujian Province Fuzhou350002FujianPeople’s Republic of China College of Forestry Fujian Agriculture and Forestry UniversityFuzhou350002People’s Republic of China Bako Agriculture Research Center Oromia Agriculture Research InstitutesP.O.Box03BakoOromiaEthiopia

This study investigates the spatial variability of soil organic matter(SOM),soil organic carbon(SOC)and pH in the upper 20-cm layer and 20-40 cm layer in Moso bamboo(Phyllostachys pubescens Pradelle)forests using a geostatistics *** maps of SOM,SOC,and pH were developed using ordinary kriging(OK)and inverse distance weighted(IDW)*** pH,SOC,and SOM of the two soil layers ranged from 4.6 to 4.7,from 1.5 to 2.7 g kg^(-1)and from 20.3 to 22.4 g kg^(-1),*** coefficient of variation for SOM and SOC was 29.9-43.3%while a weak variability was found for *** and exponential models performed well in describing the spatial variability of SOC contents with R^(2)varying from 0.95 to *** nugget/sill values of pH are less than 25%,which indicates a strong spatial correlation,while the nugget/sill values of SOC and SOM fall under moderate spatial *** using ordinary kriging and inverse distance weighted methods revealed that the spatial distribution of SOM,SOC,and pH was inconsistent due to external and internal factors across the *** the cross-validation results,the ordinary kriging method performed better than inverse distance weighted method for selected soil *** study suggests that the spatial variability of soil chemical properties revealed by geostatistics modeling will help decision-makers improve the management of soil properties.

关键词： Cross-validation Geostatistics Inverse distance weighted Ordinary kriging Semi-variance

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3D-快速梯度回波水激发序列探讨后交叉韧带损伤后膝关节软骨形态学改变

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影像诊断与介入放射学 2016年第5期25卷 410-414页

作者：于晓坤刘圣源马春忠李磊张乐天津市第五中心医院放射科天津300450

目的通过与健侧膝关节对照评价后交叉韧带损伤后膝关节软骨的形态学改变。方法选择后交叉韧带损伤患者30人(男15例和女15例)进行3D-快速梯度回波水激发序列扫描并比较患侧与健侧膝关节软骨的体积。结果后交叉韧带损伤后膝关节软骨总体... 详细信息

目的通过与健侧膝关节对照评价后交叉韧带损伤后膝关节软骨的形态学改变。方法选择后交叉韧带损伤患者30人(男15例和女15例)进行3D-快速梯度回波水激发序列扫描并比较患侧与健侧膝关节软骨的体积。结果后交叉韧带损伤后膝关节软骨总体积减低,二者之间存在统计学差异(P<0.05);在男性组中后交叉韧带损伤膝关节软骨体积与对照侧均无统计学差异;在女性组中后交叉韧带损伤侧膝关节软骨与对照侧总体积、股骨外侧髁、胫骨外侧平台软骨体积改变具有统计学差异(P<0.05)。结论女性在后交叉韧带损伤后软骨体积改变较男性显著,因此提示女性在后交叉韧带损伤后膝关节软骨形态学改变更敏感。

关键词：磁共振成像后交叉韧带软骨膝关节

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Biological Activities and Crystal Structure of the Natural Anti-cancer Drug: Cucurbitacin Ⅱa

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Chinese Journal of Structural Chemistry 2020年第7期39卷 1283-1287页

作者： yu kun LI Ying CHEN Hai-Jiao liu Bo YAO Qing-Qiang School of Medicine and Life Sciences University of Jinan-Shandong Academy of Medical SciencesJinan 250200China Institute of Materia Medica Shandong First Medical University&Shandong Academy of Medical SciencesJinan 250062China

We isolated cucurbitacinⅡa from the rhizomes of Hemsleya pengxianensis,and tested the cytotoxicity of cucurbitacinⅡa against various cancer cell lines by the sulforhodamine B assay(SRB).At the same time,we preliminarily found that cucurbitacinⅡa has a certain inhibitory activity on kinase CDK1/cyclin B,and shows potent inhibitory activities against many cancer cell *** cucurbitacinⅡa was structurally characterized by specific optical rotation measurement,high-resolution mass spectroscopy and NMR spectroscopic *** addition,the molecular structure of cucurbitacinⅡa was further determined by X-ray single-crystal crystallography.

关键词： cucurbitacinⅡa crystal structure sulforhodamine B assay CDK1/cyclin B anti-cancer activity

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Improved delayed detached-eddy simulation of massive separation around triple cylinders

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Acta Mechanica Sinica 2015年第6期31卷 799-816页

作者： Zhi-Xiang Xiao kun-yu Luo School of Aerospace Engineering Tsinghua University

The massively separated flow past triple cylin- ders （TriC） in tandem arrangement is simulated using the improved delayed detached-eddy simulation （IDDES） method based on the shear stress transport （SST） model, coupled with the high order adaptive dissipation scheme. The spacing between adjacent cylinders is sub-critical （1.435D）. IDDES prediction of two cylinders （TC） with the same spacing is compared to experimental data for validation, and the numerical results agree well with the available measurements, except for the asymmetry in the gap region. The flow past TriC is investigated using the same method. Generally, the mean flow quantities past TriC, such as the velocity, pressure, and vorticity, are similar to the corresponding components of TC. However, the pressure fluctuations on the TriC surface are uniformly larger than those on TC. Meanwhile, the instantaneous flows past TriC are much more complex. The periodical blockage in the first gap region is found in the TriC case and leads to the up-and-down movement of shear layer in the second gap region.

关键词： Triple cylinders - Massive separation. IDDES ·Hybrid RANS/LES methods

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Conversion-type cathode materials for high energy density solid-state lithium batteries

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Journal of Energy Chemistry 2025年第1期 409-425页

作者： yuhao Ma Shihong Qing Hongyu liu Chuntao Ma yuan yu Chuang yu Liping Wang School of Materials and Energy University of Electronic Science and Technology of China Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology Zhejiang Sci-Tech University State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

Solid-state lithium batteries （SSLBs） are regarded as an essential growth path in energy storage systems due to their excellent safety and high energy *** particular,SSLBs using conversion-type cathode materials have received widespread attention because of their high theoretical energy densities,low cost,and *** the great progress in research and development of SSLBs based on conversiontype cathodes,their practical applications still face challenges such as blocked ionic-electronic migration pathways,huge volume change,interfacial incompatibility,and expensive processing *** review focuses on the advantages and critical issues of coupling conversion-type cathodes with solid-state electrolytes （SSEs）,as well as state-of-the-art progress in various promising cathodes （e.g.,FeS2,CuS,FeF3,FeF2,and S） in ***,representative research on conversion-type solid-state full cells is discussed to offer enlightenment for their practical ***,the energy density exhibited by the S cathode stands out impressively,while sulfide SSEs and halide SSEs have demonstrated immense potential for coupling with conversion-type ***,perspectives on conversion-type cathodes are provided at the material,interface,composite electrode,and battery levels,with a view to accelerating the development of conversion-type cathodes for high-energy–density SSLBs.

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Feature-Based Trajectory Privacy Preserving via Low-Rank and Sparse Decomposition

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Chinese Journal of Electronics 2018年第4期27卷 746-755页

作者： LI Wenping DENG kun yu Fahong College of Mathematics Physics and Information Engineering Jiaxing University

The disclosure of sensitive contents hidden in trajectories may jeopardize individuals’ privacy *** privacy preserving technologies on trajectories face the challenge of how to give consideration to the spatiotemporal structure of mobile data. Traditional trajectory privacy preserving tricks focus chiefly on partial structure,while ignoring global feature of trajectories. This research orientation tends to cause exorbitant distortion on the spatiotemporal structure of trajectories, which may give rise to low data utility. The moving behavior has itself innate sparseness feature. Thus a trajectory privacy preserving method based on feature maintaining is proposed by introducing the low-rank and sparse decomposition technique about large matrix. The proposed method iteratively decompose the feature matrix until the rank achieving stability to extract the primary feature and eliminate the private parts. The released trajectories are reconstructed by perturbing the final refined feature matrix with a series of low-rank components generated in the decomposition procedure. Experimental results on real-world dataset verified that the proposed method has low information loss on large-scale data.

关键词： Privacy preserving Trajectory Low-rank and sparse decomposition Feature

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Artemisinin, GABA signaling and cell reprogramming： when an old drug meets modern medicine

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Science Bulletin 2017年第6期62卷 386-387页

作者： Hai-kun liu Division of Molecular Neurogenetics German Cancer Research Center (DI(FZ) DKFZ-ZMBH Alliance Heidelberg 69120 Germany

The hormone-secreting endocrine cells(α,β,δ,ε and PP cells)form pancreatic islets,which are strongly involved in regulation of *** of insulin-producingβcells is the major cause of type 1 *** progress in cell reprogramming demonstrates the feasibility of generating functionalβcells to treat type 1 diabetes[1].However,a non-invasive in vivo approach forβcell reprogramming is still ***,two reports in

关键词： GABA cell Artemisinin,GABA signaling and cell reprogramming:when an old drug meets modern medicine

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Crystallization management of CsPbI_(2)Br perovskites by PbAc_(2)-incorporated twice spin-coating process for efficient and stable CsPbI_(2)Br perovskite solar cells

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Journal of Energy Chemistry 2024年第10期97卷 419-428,I0008页

作者： yu liu kun Lang Huifang Han Huijing liu Yao Fu Pengchen Zou Yinhui Lyu Jia Xu Jianxi Yao State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing Key Laboratory of Energy Safety and Clean UtilizationNorth China Electric Power UniversityBeijing 102206China

CsPbI_(2)Br perovskite solar cell has been extensively studied due to its exceptional thermal stability and relatively stable perovskite phase ***,the presence of bromine leads to a rapid crystallization rate of CsPbI_(2)Br films,resulting in small grain size and high defect ***,CsPbI_(2)Br demonstrates poor light absorption due to its wide ***,it is crucial to control the crystallization rate and increase the film thickness to reduce defect density,enhance light absorption,and improve photovoltaic *** this study,we utilized a PbAc_(2)-incorporated twice spincoating(PTS) process to address these ***,PbAc_(2) was added to the CsPbI_(2)Br precursor solution to form a CsPbI_(2)Br film,which was then coated with the CsPbI_(2)Br precursor solution to produce the PTS film,Ac^(-)can delay the perovskite crystallization,leading to the formation of thicker and denser CsPbI_(2)Br ***,lone-pair electrons of the oxygen atom provided by Ac^(-)formed coordination bonds with under-coordinated Pb~(2+) ions to fill halogen ion vacancies,thereby reducing the defect ***,the PTS CsPbI_(2)Br device achieved a peak power conversion efficiency(PCE) of 16.19% and maintained 96.7% of its initial PCE over 1500 h at room temperature under 25% relative humidity without any encapsulation.

关键词： CsPbI_(2)Br Twice spin-coating process PbAc_(2) Crystallization management Perovskite solar cells

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果蔗新品种桂果蔗1号高产栽培技术

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中国糖料 2017年第6期39卷 54-56,59页

作者：何毅波李松刘俊仙余坤兴刘红坚刘丽敏卢曼曼刘欣广西农业科学院甘蔗研究所/广西蔗糖产业协同创新中心/农业部广西甘蔗生物技术与遗传改良重点实验室广西甘蔗遗传改良重点实验室南宁530007

为了进一步规范果蔗新品种桂果蔗1号的高产栽培技术,做到良种良法配套,因地制宜地加快该品种的推广,达到果蔗高产、稳产和优质,通过对其高产栽培技术试验和大面积生产示范,分析其主要特征特性、产量结构、品质、适应范围和利用前景,明... 详细信息

为了进一步规范果蔗新品种桂果蔗1号的高产栽培技术,做到良种良法配套,因地制宜地加快该品种的推广,达到果蔗高产、稳产和优质,通过对其高产栽培技术试验和大面积生产示范,分析其主要特征特性、产量结构、品质、适应范围和利用前景,明确了该品种高产栽培的产量构成及种茎处理、整地、施肥、播种、田间管理等技术,适用于广西、广东等果蔗产区中高产肥力田地种植。

关键词：桂果蔗1号产量构成田间管理栽培技术

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Mechanism and numerical analysis of heat transfer enhancement in the core flow along a tube

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Science China(Technological Sciences) 2008年第8期51卷 1195-1202页

作者： liu Wei YANG kun School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China

The present study introduces the principles of enhanced heat transfer in the core flow to form an equivalent thermal boundary layer in the fully developed laminar tube flow, which consequently enlarges the temperature gradient of the fluid near the tube wall, and thereby enhances the heat transfer between the fluid and the tube wall. At the same time, the increase of flow resistance in the tube is not so obvious. Mechanism analysis and numerical calculation based on air and water have been carried out to verify the principle and method presented in this paper, which may bring positive effects to the design of heat exchanger with high heat transfer efficiency and low flow resistance.

关键词： laminar tube flow core flow boundary flow heat transfer enhancement

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