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Spatiotemporal evolution and prediction of habitat quality in Hohhot City of China based on the InVEST and CA-Markov models

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Journal of Arid Land 2023年第1期15卷 20-33页

作者： LUAN Yongfei HUANG Guohe zheng guanghui College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China School of Environment Beijing Normal UniversityBeijing 100875China School of Architecture and Art Central South UniversityChangsha 410083China

With the acceleration of urbanization,changes in the urban ecological environment and landscape pattern have led to a series of prominent ecological environmental *** order to better coordinate the balanced relationship between city and ecological environment,we selected land use change data to evaluate the habitat quality in Hohhot City of China,which is of great practical significance for regional urban and economic ***,the integrated valuation of ecosystem services and tradeoffs(InVEST)and Cellular Automata-Markov(CA-Markov)models were used to analyze,predict,and explore the Spatiotemporal evolution path and characteristics of urban land use,and forecast the typical evolution pattern of land use in *** results showed that the land use types in Hohhot City changed significantly from 2000 to 2020,and the biggest change took place in cultivated land,grassland,shrub,and artificial *** decrease of cultivated land area and the increase of artificial surface area were the main impact trend of land use *** average value of habitat quality had been decreasing continuously from 2000 to 2020,and the values of habitat degradation were 0.2605,0.2494,and 0.2934 in 2000,2010,and 2020,respectively,showing a decreasing *** decrease of habitat quality was caused by the needs of economic development and urban construction,as well as the impact of land *** this evolution,many cultivated land and urban grassland had been converted into construction *** simulated land use changes in 2030 are basically the same as those during 2000-2020,and the habitat quality will still be *** regional changes are influenced by the urban rapid development and industrial *** results can provide decision-making reference for regional urban planning and management as well as habitat quality evaluation.

关键词： land use urbanization InVEST CA-Markov habitat quality Hohhot City

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Estimation of Organic Matter Content in Coastal Soil Using Reflectance Spectroscopy

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Pedosphere 2016年第1期26卷 130-136页

作者： zheng guanghui Dongryeol RYU JIAO Caixia HONG Changqiao School of Geography and Remote Sensing Nanjing University of Information Science & Technology Department of Infrastructure Engineering University of Melbourne

Rapid determination of soil organic matter(SOM) using regression models based on soil reflectance spectral data serves an important function in precision agriculture. "Deviation of arch"(DOA)-based regression and partial least squares regression(PLSR)are two modeling approaches to predict ***,few studies have explored the accuracy of the DOA-based regression and PLSR ***,the DOA-based regression and PLSR were applied to the visible near-infrared(VNIR) spectra to estimate SOM content in the case of various dataset divisions.A two-fold cross-validation scheme was adopted and repeated 10 000 times for rigorous evaluation of the DOA-based models in comparison with the widely used PLSR *** samples were collected for SOM analysis in the coastal area of northern Jiangsu Province,*** results indicated that both modelling methods provided reasonable estimation of SOM,with PLSR outperforming DOA-based regression in ***,the performance of PLSR for the validation dataset decreased more *** the four DOA-based regression models,a linear model provided the best estimation of SOM and a cutoff of SOM content(19.76 g kg^(-1)),and the performance for calibration and validation datasets was *** the SOM content exceeded 19.76 g kg^(-1),SOM became more effective in masking the spectral features of other soil properties to a certain *** work confirmed that reflectance spectroscopy combined with PLSR could serve as a non-destructive and cost-efficient way for rapid determination of SOM when hyperspectral data were *** DOA-based model,which requires only 3 bands in the visible spectra,also provided SOM estimation with acceptable accuracy.

关键词： deviation of arch multiple regression partial least squares regression reflectance spectra soil organic matter

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Pedotransfer functions for predicting bulk density of coastal soils in East China

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Pedosphere 2023年第6期33卷 849-856页

作者： guanghui zheng Caixia JIAO Xianli XIE Xuefeng CUI Gang SHANG Chengyi ZHAO Rong ZENG School of Geographic Sciences Nanjing University of Information Science&TechnologyNanjing 210044China Meteorology and Climate Centre School of Mathematics and StatisticsUniversity College DublinBelfieldDublin 4Ireland Institute of Soil Science Chinese Academy of ScienceNanjing 210008China School of Systems Science Beijing Normal UniversityBeijing 100875China

Soil bulk density(BD) is an important physical property and an essential factor for weight-to-volume conversion. However, BD is often missing from soil databases because its direct measurement is labor-intensive, time-consuming, and sometimes impractical, particularly on a large scale. Therefore, pedotransfer functions(PTFs) have been developed over several decades to predict BD. Here, six previously revised PTFs(including five basic functions and stepwise multiple linear regression(SMLR)) and two new PTFs, partial least squares regression(PLSR) and support vector machine regression(SVMR), were used to develop BD-predicting PTFs for coastal soils in East China. Predictor variables included soil organic carbon(SOC) and particle size distribution(PSD). To compare the robustness and reliability of the PTFs used, the calibration and prediction processes were performed 1 000 times using the calibration and validation sets divided by a random sampling algorithm. The results showed that SOC was the most important predictor, and the revised PTFs performed reasonably although only SOC was included. The PSD data were useful for a better prediction of BD, and sand and clay fractions were the second and third most important properties for predicting BD. Compared to the other PTFs, the PLSR was shown to be slightly better for the study area(the average adjusted coefficient of determination for prediction was 0.581). These results suggest that PLSR with SOC and PSD data can be used to fill in the missing BD data in coastal soil databases and provide important information to estimate coastal carbon storage, which will further improve our understanding of sea-land interactions under the conditions of ongoing global warming.

关键词： partial least squares regression particle size distribution soil organic carbon stepwise multiple linear regression support vector machine regression

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Antigen epitopes of animal coronaviruses:a mini-review

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Animal Diseases 2024年第1期4卷 19-26页

作者： Mingjun Su guanghui zheng Xiangwen Xu Houhui Song Key Laboratory of Applied Technology On Green-Eco-Healthy Animal Husbandry of Zhejiang Province Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics&Advanced TechnologyZhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health ManagementChina-Australia Joint Laboratory for Animal Health Big Data AnalyticsCollege of Animal Science and Technology&College of Veterinary Medicine of ZhejiangA&F University666 Wusu StreetLin'an DistrictHangzhou 311300Zhejiang ProvinceChina

Coronaviruses are widespread in nature and can infect mammals and poultry,making them a public health ***,prevention and control of emerging and re-emerging animal coronaviruses is a great *** mecha-nisms of virus-mediated immune responses have important implications for research on virus prevention and *** antigenic epitope is a chemical group capable of stimulating the production of antibodies or sensitized lympho-cytes,playing an important role in antiviral immune ***,it can shed light on the development of diagnos-tic methods and novel ***,we have reviewed advances in animal coronavirus antigenic epitope research,aiming to provide a reference for the prevention and control of animal and human coronaviruses.

关键词： Animal coronavirus Antigen epitope B-cell epitope T-cell epitope Immune responses Vaccines

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Oxidation process of lanthanum hexaboride ceramics

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Rare Metals 2002年第2期21卷 101-105页

作者： zheng Shuqi, MIN guanghui, ZOU Zengda , YU Huashun, HAN Jiande , and WANG Weiti School of Materials Science and Engineering, Shandong University, Jinan 250061, China School of Materials Science and Engineering Shandong University Jinan 250061

Oxidation process of lanthanum hexaboride (LaB_6) ceramic powderwas investigated. The laB_6 powder sma- ples were heated continuallyfrom room temperature to 1473 K at a heating rate of 10 k/min bydifferential scanning calorimetry. The oxidation tests were conductedat different exposure temeratures. The phases and morphologies of thesamples before and after exposure were analyzed by XRD and SEM. Itwas pointed out that before 1273 K, LaB_6 has high oxidationresistant ability, which was due to that the oxide layer hinders theoxygen diffusion from outer to the sur- face of Lab_6 grains.

关键词： lanthanum hexaboride oxidation mechanism ceramic

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Automatic quantitative analysis of metabolism inactivation concentration in single bacterium using stimulated Raman scattering microscopy with deep learning image segmentation

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Medicine in Novel Technology and Devices 2022年第2期14卷 55-61页

作者： Bo Sun Zhaoyi Wang Jiaqian Lin Chen Chen guanghui zheng Shuhua Yue Haiquan Wang Xixiong Kang Xun Chen Weili Hong Pu Wang Instiute of Medical Photonics Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100191China Laboratory Diagnosis Center Beijing Tiantan HospitalCapital Medical UniversityBeijing100050China College of Software Beihang UniversityBeijing100191China School of Medical Science and Engineering Beihang UniversityBeijing100191China

Rapid antimicrobial susceptibility testing(AST)is urgently needed to slow down the emergence of antibioticresistant bacteria and treat infections with correct *** Raman scattering(SRS)microscopy is a technique that enables rapid chemical-bond imaging with sub-cellular *** can obtain the AST results with a single bacterium *** the SRS imaging assay is relatively fast,taking less than 2 h,the calculation of single-cell metabolism inactivation concentration(SC-MIC)is performed manually and takes a long *** bottleneck tasks that hinder the SC-MIC throughput include bacterial segmentation and intensity *** address these issues,we devised a hybrid algorithm to segment single bacteria from SRS images with automatic *** proposed method comprises a U-Net convolutional neural network(CNN),DropBlock,and secondary segmentation *** results show that SC-MIC calculation can be accomplished within 1 min and more accurate segmentation results using deep learning-based bacterial segmentation method,which is essential for its clinical applications.

关键词： Metabolism inactivation concentration Single bacterium Stimulated Raman scattering Deep learning

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一种隧道施工多功能辅助作业车

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中国工程机械学报 2021年第5期19卷 443-446,452页

作者：郑光辉武汉地铁集团有限公司武汉地铁集团建设事业总部湖北武汉430073

根据城市地铁圆形隧道特殊环境施工的需求,研制开发了一种隧道施工多功能辅助作业车。本作业车可以在整个盾构施工期间投入使用,结构方面实现作业平台伸缩、材料起重吊装、液压微型控制等功能,主要完成的工作内容有管片质量缺陷修复、... 详细信息

根据城市地铁圆形隧道特殊环境施工的需求,研制开发了一种隧道施工多功能辅助作业车。本作业车可以在整个盾构施工期间投入使用,结构方面实现作业平台伸缩、材料起重吊装、液压微型控制等功能,主要完成的工作内容有管片质量缺陷修复、管片背后补浆、管片接缝施工、螺栓手孔施工、轨道轨枕吊装和管片清洗等。整体结构设计的机械化和自动化水平较高,安全便捷适用性较强,同时该作业车在尺寸设计方面充分考虑同步交叉作业施工,可以实现安全、质量、进度、成本4大要素全方位的控制,属国内外首创辅助作业车。

关键词：隧道施工辅助作业车液压调控系统质量管理控制机械自动化

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基于图论的多杆式栽植机构构型综合与方法研究

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农业机械学报 2022年第5期53卷 67-74页

作者：孙良郑广辉叶治政俞高红浙江理工大学机械与自动控制学院杭州310018 浙江省种植装备技术重点实验室杭州310018

针对目前栽植机械中多杆式栽植机构构型有限的问题,借助图论型综合的方式,构建完备的多连杆栽植机构构型库。首先,在连杆机构运动链综合中,基于加权四次幂矩阵与加权最小距离矩阵的方法,获取拓扑图顶点相似特征码,根据不同顶点间特征码... 详细信息

针对目前栽植机械中多杆式栽植机构构型有限的问题,借助图论型综合的方式,构建完备的多连杆栽植机构构型库。首先,在连杆机构运动链综合中,基于加权四次幂矩阵与加权最小距离矩阵的方法,获取拓扑图顶点相似特征码,根据不同顶点间特征码的唯一性,开展运动链拓扑图相似点识别与同构判别;其次,建立栽植机构构型筛选规则,利用相似点的特征实现功能点的选取,建立了6构件至9构件机构功能拓扑图图库,得到六杆一自由度构型14个,七杆二自由度构型17个,八杆一自由度构型510个,九杆二自由度构型917个;最后,在构型库中选取不同构件数下的构型进行运动学建模,优化获得适合栽植作业运动要求的新型六杆、七杆、八杆栽植机构尺寸,并进行运动仿真验证了构型综合方法的正确性,可为多样化种植机械的创新设计提供更多可选构型。

关键词：栽植机构运动链相似识别同构判别图论

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冻融循环层理砂岩冲击荷载下应变率特性研究

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地下空间与工程学报 2021年第1期17卷 53-61页

作者：常森许金余郑广辉空军工程大学航空工程学院西安710038 西北工业大学力学与土木建筑学院西安710072

随着现代战争武器的杀伤力不断增强,剧烈的侵彻和爆炸作用在地壳中形成能量巨大的应力波,对国防工程、民用建筑的地下围岩和地面工程造成强烈的冲击作用。同时,层理岩石广泛存在于自然界且力学性质复杂,直接关系到工程的可靠性。本文介... 详细信息

随着现代战争武器的杀伤力不断增强,剧烈的侵彻和爆炸作用在地壳中形成能量巨大的应力波,对国防工程、民用建筑的地下围岩和地面工程造成强烈的冲击作用。同时,层理岩石广泛存在于自然界且力学性质复杂,直接关系到工程的可靠性。本文介绍了Φ100 mm SHPB试验系统结构及其基本原理;基于SHPB冲击试验平台对经历0、20、40次冻融循环的垂直、平行层理试样进行6、8、10、12、14 m/s弹速下的冲击压缩试验;对冲击作用下冻融循环层理砂岩的应变率特性进行分析,研究了冲击作用下冻融循环层理砂岩的强度、变形性质,针对性地对岩石的层理动荷载关系进行了力学响应的试验研究。试验结果对高寒、冻融地区的岩土工程及地下工程施工具有较强指导意义。

关键词：冻融循环层理砂岩冲击力学性能 SHPB试验系统

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基于整环足尺试验的盾构隧道破坏机制及纵缝外弧面变形分析

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隧道建设（中英文） 2021年第S02期41卷 165-171页

作者：郑光辉庞小朝王康任武汉地铁集团有限公司湖北武汉430000 铁科院(深圳)研究设计院有限公司广东深圳518000

为探明隧道的结构破坏机制及外弧面纵缝变形规律,以某病害多、受力工况复杂的区间地铁盾构隧道为对象,开展2组错缝拼装盾构隧道整环足尺试验,挖掘盾构隧道全过程结构破坏特征点,归纳收敛变形-外弧面纵缝变形关联关系,并获得收敛变形-外... 详细信息

为探明隧道的结构破坏机制及外弧面纵缝变形规律,以某病害多、受力工况复杂的区间地铁盾构隧道为对象,开展2组错缝拼装盾构隧道整环足尺试验,挖掘盾构隧道全过程结构破坏特征点,归纳收敛变形-外弧面纵缝变形关联关系,并获得收敛变形-外弧面纵缝变形关键指标。研究结果表明:1)盾构隧道收敛变形达到20~30 mm时开始出现沿隧道纵向的管片裂缝;2)盾构隧道结构破坏可分为弹性、弹塑性和极限状态3个阶段,极限状态时可观察到管片本体受压破坏及多处纵缝破损;3)盾构隧道腰部纵缝外弧面张开量与收敛变形、拼装角度高度关联。

关键词：盾构隧道足尺试验破坏机制收敛变形纵缝变形

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