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基于土地利用变化的忻州市生态格局时空变化分析

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中国环境监测 2024年第2期40卷 141-151页

作者：陈孟涤覃鑫浩王砚峰李青朱自娟陈清霖张可教赵聪国家林业和草原局林草调查规划院北京100714 国家林业和草原局生态建设工程管理中心北京100714 中国科学院空天信息创新研究院北京100101 辽宁省林业发展服务中心辽宁沈阳110036 国有清原满族自治县城郊林场辽宁抚顺113300 辽宁抚顺林业发展服务中心辽宁抚顺113008

为了厘清改革开放以来忻州市各类生态系统及生态系统格局的时空特征,使用忻州全市1980、2000、2018年的土地利用和覆盖(LULC)二级分类数据,经过土地转移矩阵和景观格局指数计算,探讨分析了忻州市改革开放以来近40年的LULC及格局的长时... 详细信息

为了厘清改革开放以来忻州市各类生态系统及生态系统格局的时空特征,使用忻州全市1980、2000、2018年的土地利用和覆盖(LULC)二级分类数据,经过土地转移矩阵和景观格局指数计算,探讨分析了忻州市改革开放以来近40年的LULC及格局的长时间序列时空变化特征,以揭示忻州市的生态环境变化态势。研究区近40年来以城镇用地和其他建设用地增加为主,其他各类减少,城镇化和人口增长带来的土地和生态压力主要集中在草地、耕地以及湿地上;其中2000—2018年的变化更剧烈,人类活动对自然的干扰加剧,但同时在这一阶段已经开始了森林、湿地的保护,开展经济发展与生态文明同步建设。

关键词：土地利用和覆盖景观格局时空变化特征

2017-2022年淄博市诺如病毒流行特征及病原学基因分析

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中国病原生物学杂志 2024年第5期19卷 562-565页

作者：张玲曹海霞郑加玉孙晓明陈梦迪傅忠燕靳淼山东省淄博市疾病预防控制中心山东淄博255026 山东省疾病预防控制中心中国疾病预防控制中心病毒病预防控制所国家卫生健康委员会医学病毒和病毒病重点实验室

目的分析2017-2022年淄博市诺如病毒感染性疫情流行特征及优势基因型,为诺如病毒感染防控提供科学依据。方法用描述性流行病学方法,对2017-2022年淄博市诺如病毒感染性疫情流行病学资料和实验室检测资料进行统计分析。结果2017-2022年... 详细信息

目的分析2017-2022年淄博市诺如病毒感染性疫情流行特征及优势基因型,为诺如病毒感染防控提供科学依据。方法用描述性流行病学方法,对2017-2022年淄博市诺如病毒感染性疫情流行病学资料和实验室检测资料进行统计分析。结果2017-2022年淄博市共报告35起诺如病毒感染性疫情,其中托幼机构23起,中学7起,餐饮机构3起,小学和养老机构各1起,不同场所罹患率有统计学意义;报告发病917人,罹患率为8.30%,疫情总体呈上升趋势,年均增长率为10.76%;城市29起,农村6起,罹患率城市高于农村,差异有统计学意义;85.71%的诺如病毒感染性疫情与人传人传播有关,每年10月至次年3月是诺如病毒感染性疫情高峰期(68.57%,24/35);35起疫情中,以诺如病毒GⅡ组为主(阳性率80.00%,176/220),GI组检出率为13.641%(30/220),GⅨ组检出率低(6.36%,14/220);基因分型GⅡ.2[P16]占比最高(占35.71%,10/28),其次GⅡ.4[P16](占14.29%,4/28)、GⅡ.3[P12](占10.71%,3/28)和少数其他重组基因型。结论淄博市诺如病毒感染性疫情呈现上升趋势,托幼机构是发生诺如病毒感染性疫情的主要场所,诺如病毒感染性疫情主要为GⅡ组为主,GⅡ.2[P16]基因型为优势基因型,合并多种重组型的流行特征,加强诺如病毒分子流行病学监测,有利于掌握诺如病毒流行病学特征,为科学防控提供理论依据。

关键词：诺如病毒感染性疫情流行特征基因型

Review of Fiber-Optic Localized Surface Plasmon Resonance Sensors:Geometries,Fabrication Technologies,and Bio-Applications

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Photonic Sensors 2024年第2期14卷 31-56页

作者： mengdi LU chen WANG Ruizhi FAN Ming LIN Jianye GUANG Wei PENG Affiliated Cancer Hospital Dalian University of TechnologyShenyang 110042China School of Physics Dalian University of TechnologyDalian 116024China

Localized surface plasmon resonance(LSPR)biosensors,which enable nanoscale confinement and manipulation of light,offer the enhanced sensitivity and electromagnetic energy *** integration of LSPR with the fiber-optic technology has led to the development of compact and versatile sensors for miniaturization and remote *** comprehensive review explores various sensor configurations,fiber types,and geometric shapes,highlighting their benefits in terms of sensitivity,integration,and performance *** techniques such as focused non-chemical bonding strategies and self-assembly of nanoparticles are discussed,providing control over nanostructure morphology and enhancing sensor ***-applications of fiber-optic LSPR(FOLSPR)sensors are detailed,specifically in biomolecular interactions and analysis of proteins,pathogens and cells,nucleic acids(DNA and RNA),and other small molecules(organic compounds and heavy metal ions).Surface modification and detection schemes are emphasized for their potential for label-free and real-time *** challenges and prospects of FOLSPR sensors are addressed,including the developments in sensitivity,fabrication techniques,and measurement *** with emerging technologies such as nanomaterials is highlighted as a promising direction for future ***,this review provides insights into the advancements and potential applications of FOLSPR sensors,paving the way for sensitive and versatile optical biosensing platforms in various fields.

关键词： Fiber-optic localized surface plasmon resonance biosensor nanoparticles geometric configuration fabrication technology

Research on simulation of gun muzzle flow field empowered by artificial intelligence

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Defence Technology（防务技术） 2024年第2期32卷 196-208页

作者： mengdi Zhou Linfang Qian Congyong Cao Guangsong chen Jin Kong Ming-hao Tong School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Northwest Institute of Mechanical and Electrical Engineering Xianyang712099ShaanxiChina School of Automation Nanjing University of Science and TechnologyNanjing210094China

Artificial intelligence technology is introduced into the simulation of muzzle flow field to improve its simulation efficiency in this paper.A data-physical fusion driven framework is ***,the known flow field data is used to initialize the model parameters,so that the parameters to be trained are close to the optimal *** physical prior knowledge is introduced into the training process so that the prediction results not only meet the known flow field information but also meet the physical conservation *** two examples,it is proved that the model under the fusion driven framework can solve the strongly nonlinear flow field problems,and has stronger generalization and *** proposed model is used to solve a muzzle flow field,and the safety clearance behind the barrel side is *** is pointed out that the shape of the safety clearance under different launch speeds is roughly the same,and the pressure disturbance in the area within 9.2 m behind the muzzle section exceeds the safety threshold,which is a dangerous *** with the CFD results shows that the calculation efficiency of the proposed model is greatly improved under the condition of the same calculation *** proposed model can quickly and accurately simulate the muzzle flow field under various launch conditions.

关键词： Muzzle flow field Artificial intelligence Deep learning Data-physical fusion driven Shock wave

Preparation and Thermal Stability of AlMoON Based Solar Selective Absorption Coating

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 854-862页

作者：闵捷 YUAN Wenxu chen Yufei LAN Yapeng YAN mengdi LIU Hanze chenG Xudong 代路 Hubei Provincial Key Laboratory of Green Materials for Light Industry Hubei University of TechnologyWuhan 430068China Col-laborative Innovation Center of Green Light-weight Materials and Processing Hubei University of TechnologyWuhan 430068China School of Materials and Chemical Engineering Hubei University of TechnologyWuhan 430068China School of Industrial Design Hu-bei University of TechnologyWuhan 430068China State Key Laboratory of Advanced Technology for Materials Synthesis and Process-ing Wuhan University of TechnologyWuhan 430070China Science and Technology on Thermal Energy and Power Laboratory Wuhan Second Ship Design&Research InstituteWuhan 430205China

AlMoON based solar selective absorption coatings were deposited on stainless steel substrate by magnetron *** coatings included infrared reflection layer Mo,absorption layer AlMoN,absorption layer AlMoON and antireflection layer AlMoO from bottom to *** surface of the deposited coatings is flat without obvious *** absorptivity and emissivity are 0.896 and 0.09,respectively,and the quality factor is *** heat treatment at 500℃-36 h,the surface roughness of the coating increases,a small number of cracks and other defects appear,and the broken part is still attached to the coating surface.A certain degree of element diffusion occurs in the coatings,resulting in the decline of the optical properties of the *** absorptivity and emissivity are 0.883 and 0.131,respectively,the quality factor is 7.06,and the PC value is *** coatings do not fail under this condition and have certain thermal stability.

关键词： AlMoON coating preparation thermal stability

目标管理护理干预模式在胰腺癌患者术前口服营养补充剂中的应用

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肝胆胰外科杂志 2024年第3期36卷 168-171页

作者：丁玲张晓娇王飞通彭胜赵会玲陈梦娣徐州医科大学附属医院肝胆胰疝外科江苏徐州221006

目的探讨目标管理护理干预模式在胰腺癌患者术前口服营养补充剂(ONS)中的应用效果。方法回顾性分析2022年6月至2023年6月在徐州医科大学附属医院胰腺外科诊疗的96例胰腺癌患者为研究对象,按接诊的时间先后顺序分为对照组(n=47)和观察组(... 详细信息

目的探讨目标管理护理干预模式在胰腺癌患者术前口服营养补充剂(ONS)中的应用效果。方法回顾性分析2022年6月至2023年6月在徐州医科大学附属医院胰腺外科诊疗的96例胰腺癌患者为研究对象,按接诊的时间先后顺序分为对照组(n=47)和观察组(n=49)。对照组按护理常规实施术前营养护理,观察组实施以目标管理理念为核心的营养护理干预模式,包括营养评估、制定目标执行计划、计算个体化目标需要能量、发放执行日记、营养耐受性监测及针对性方案调整等。比较两组ONS总依从率及平均达标率、并发症发生率、营养生化指标、胃肠功能恢复指标。结果干预后观察组ONS总依从率(91.8%)、平均达标率[(111.85±6.99)%]显著高于对照组总依从率(74.5%)、平均达标率[(61.88±8.26)%](P0.05)。结论目标管理护理干预模式能够有效改善胰腺癌患者术前ONS依从性,提高ONS平均达标率,从而降低术后并发症发生率,改善患者术后营养状况,促进术后胃肠功能恢复。

关键词：胰腺癌目标管理营养风险口服营养补充剂护理干预

A Comprehensive Study of a Low-Grade Heat-Driven Cooling and Power System Based on Heat Current Method

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Journal of Thermal Science 2024年第4期33卷 1523-1541页

作者： ZHAO Tian XU Ronghong XIN Yonglin HE Kelun MA Huan YUAN mengdi chen Qun School of Energy Storage Science and Engineering North China University of TechnologyBeijing100144China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing100084China

Combined cooling and power(CCP)system driven by low-grade heat is promising for improving energy *** work proposes a CCP system that integrates a regenerative organic Rankine cycle(RORC)and an absorption chiller on both driving and cooling fluid *** system is modeled by using the heat current method to fully consider nonlinear heat transfer and heat-work conversion constraints and resolve its behavior *** off-design system simulation is performed next,showing that the fluid inlet temperatures and flow rates of cooling water as well as RORC working fluid strongly affect system *** off-design operation even becomes infeasible when parameters deviate from nominal values largely due to limited heat transfer capability of components,highlighting the importance of considering heat transfer constraints via heat current *** optimization aiming to minimize the total thermal conductance is also *** efficiency increases by 7.9%and decreases by 12.4%after optimization,with the hot fluid inlet temperature increase from 373.15 to 403.15 K and mass flow rate ranges from 10 to 30 kg/s,emphasizing the necessity of balancing system cost and performance.

关键词： combined cooling and power system organic Rankine cycle absorption chiller cascade heat utilization heat current method off-design analysis

Survey of hepatitis B virus infection for liver cancer screening in China:A population-based,cross-sectional study

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Chinese Medical Journal 2024年第12期137卷 1414-1420页

作者： Yongjie Xu Changfa Xia He Li Maomao Cao Fan Yang Qianru Li mengdi Cao Wanqing chen Office of Cancer Screening National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Office of National Cancer Regional Medical Centre in Liaoning Province The First Affiliated Hospital of China Medical UniversityShenyangLiaoning 110001China

Background:Hepatitis B virus(HBV)infection is the primary cause of hepatocellular carcinoma(HCC)in *** target population for HCC screening comprises individuals who test positive for hepatitis B surface antigen(HBsAg).However,current data on the prevalence of HBV infection among individuals who are eligible for HCC screening in China are *** aimed to assess the seroepidemiology of HBV infection among Chinese individuals eligible for HCC screening to provide the latest evidence for appropriate HCC screening strategies in ***:Questionnaires including information of sex,age,ethnicity,marital status,educational level,source of drinking water,as well as smoking and alcohol consumption history and serum samples were collected from females aged 45-64 years and males aged 35-64 years in 21 counties from 4 provinces in eastern and central China between 2015 and ***-linked immunosorbent assay methods were used to detect the serum HBV marker ***:A total of 603,082 individuals were enrolled,and serum samples were collected for analysis from January 1,2015 to December 31,*** prevalence of HBsAg positive in the study population was 5.23%(31,528/603,082).The prevalence of HBsAg positive was greater in males than in females(5.60%[17,660/315,183]vs 4.82%[13,868/287,899],χ^(2)=187.52,P<0.0001).The elderly participants exhibited a greater prevalence of HBV infection than younger participants(χ^(2)=41.73,P<0.0001).Birth cohort analysis revealed an overall downward trend in HBV prevalence for both males and *** born in more recent cohorts exhibited a lower prevalence of HBV infection as compared to those born ***:The current prevalence of HBV infection remains above 5%in populations eligible for HCC screening in *** efforts should be made to increase the accessibility of HCC screening among individuals with HBV infection.

关键词： Hepatitis B virus Liver cancer screening China Hepatitis B surface antigens Early detection of cancer

Quasi-One-Dimensional van der Waals Transition Metal Trichalcogenides

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Research 2023年第4期2023卷 219-243页

作者： mengdi chen Lei Li Manzhang Xu Weiwei Li Lu Zheng Xuewen Wang Frontiers Science Center for Flexible Electronics(FSCFE)&Shaanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'an 710072China Shaanxi Key Laboratory of Flexible Electronics(KLoFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'an 710072China MIIT Key Laboratory of Flexible Electronics(KLoFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi’an710072China Key Laboratory of Flexible Electronics of Zhejiang Provience Ningbo Institute of Northwestern Polytechnical University218 Qingyi RoadNingbo 315103China.

The transition metal trichalcogenides(TMTCs)are quasi-one-dimensional(1D)MX_(3)-type van der Waals layered semiconductors,where M is a transition metal element of groups IV and V,and X indicates chalcogen *** to the unique quasi-1D crystalline structures,they possess several novel electrical properties such as variable bandgaps,charge density waves,and superconductivity,and highly anisotropic optical,thermoelectric,and magnetic *** study of TMTCs plays an essential role in the 1D quantum materials field,enabling new opportunities in the material research ***,tremendous progress in both materials and solid-state devices has been made,demonstrating promising applications in the realization of nanoelectronic *** review provides a comprehensive overview to survey the state of the art in materials,devices,and applications based on ***,the symbolic structure,current primary synthesis methods,and physical properties of TMTCs have been ***,examples of TMTC applications in various fields are presented,such as photodetectors,energy storage devices,catalysts,and ***,we give an overview of the opportunities and future perspectives for the research of TMTCs,as well as the challenges in both basic research and practical applications.

关键词： Transition realization crystalline