检索结果-南通市图书馆

维普期刊数据库博看期刊

同方期刊数据库

河南省2040年土地利用格局及有机碳储量预测研究

在线全文

学校读者我要写书评

暂无评论

林业调查规划 2024年第4期49卷 35-42页

作者：胡国宝乔栋张楚磊李晓林田耀武河南科技大学园艺与植物保护学院河南洛阳471000

基于河南省2000、2020年土地利用数据以及社会、气象数据,采用PLUS模型模拟河南省2040年不同发展情景下的土地利用及有机碳分布格局。模拟结果显示,河南省2040年3种情景下的有机碳储量分别为1206.98×10^(6) t(自然发展情景)、1211.98×... 详细信息

基于河南省2000、2020年土地利用数据以及社会、气象数据,采用PLUS模型模拟河南省2040年不同发展情景下的土地利用及有机碳分布格局。模拟结果显示,河南省2040年3种情景下的有机碳储量分别为1206.98×10^(6) t(自然发展情景)、1211.98×10^(6) t(耕地保护情景)、1212.20×10^(6) t(生态保护情景),表明林地数量的提高对河南省有机碳储量的提升具有积极作用。河南省有机碳呈明显的区域性分布特征,总体表现为西部较高,南部次之,东部和北部表现出一定的中等水平分布特征。

关键词：土地利用格局有机碳储量预测 PLUS模型

在线全文

学校读者我要写书评

暂无评论

复杂扩压器精铸加工缺陷分析及余量控制方法

西安工业大学学报 2024年第3期44卷 330-336页

作者：祁圣英张艺军刘国宝樊祥明中国人民解放军93170部队西安710000 中国航发动力股份有限公司西安710021

针对复杂精铸扩压器加工位置铸造余量不足缺肉、焊接止口厚度薄厚不均匀等现象,文中分析了机械加工过程中复杂精铸扩压器变形机理,利用三坐标检测、划线检查、余量试切等方法确定内外引气管的缺陷位置及大小,控制铸件毛料余量加工要求... 详细信息

针对复杂精铸扩压器加工位置铸造余量不足缺肉、焊接止口厚度薄厚不均匀等现象,文中分析了机械加工过程中复杂精铸扩压器变形机理,利用三坐标检测、划线检查、余量试切等方法确定内外引气管的缺陷位置及大小,控制铸件毛料余量加工要求。研究结果表明:文中方法提高了铸件扩压器机械加工尺寸的一致性,降低了机械加工难度,有效解决了约96%的铸造毛料缺陷及变形严重引起的零件报废问题,可为普通铸件毛料预检测及机械加工提供参考。

关键词：特种铸造熔模铸造扩压器铸件缺陷余量控制

在线全文

学校读者我要写书评

暂无评论

光对秋水仙碱稳定性的影响及光稳定剂筛选

军事医学 2024年第5期48卷 376-381页

作者：杨国宝董静龚伟杨美燕高春生王玉丽杨阳军事科学院军事医学研究院北京100850

目的提高秋水仙碱(COL)在制剂缓释微丸中的光稳定性。方法对COL光化降解动力学进行研究,了解其降解规律,通过添加光稳定剂屏蔽光线以抑制COL发生光化降解,并考察了光稳定剂种类、颜色、用量、位置对COL缓释微丸光稳定性的影响。结果以... 详细信息

目的提高秋水仙碱(COL)在制剂缓释微丸中的光稳定性。方法对COL光化降解动力学进行研究,了解其降解规律,通过添加光稳定剂屏蔽光线以抑制COL发生光化降解,并考察了光稳定剂种类、颜色、用量、位置对COL缓释微丸光稳定性的影响。结果以中间独立层的方式,用载药微丸重量4%的红氧化铁作为保护层制备的缓释微丸光照10 d,COL光化降解产物含量未见增长。结论COL缓释微丸中使用红氧化铁作为光稳定剂,能够有效避免COL发生光化降解。

关键词：秋水仙碱缓释微丸光化降解光稳定性光稳定剂氧化铁

同方期刊数据库

基于聚乳酸的单螺杆挤出设备传质过程仿真分析

在线全文

学校读者我要写书评

暂无评论

河南科技 2024年第12期51卷 40-45页

作者：李康秦鹏孙硕叶伊壮靳国宝唐健巢湖学院机械工程学院安徽合肥238024

【目的】针对适用于小批量、个性化定制耗材的桌面级单螺杆挤出设备的传质问题进行研究。【方法】对聚乳酸颗粒料的传质过程进行合理假设和简化,使用ANSYS Workbench进行结构仿真分析,利用POLYFLOW对螺杆和料筒的压力场、速度场和温度... 详细信息

【目的】针对适用于小批量、个性化定制耗材的桌面级单螺杆挤出设备的传质问题进行研究。【方法】对聚乳酸颗粒料的传质过程进行合理假设和简化,使用ANSYS Workbench进行结构仿真分析,利用POLYFLOW对螺杆和料筒的压力场、速度场和温度场等进行仿真分析,采用Fluent进行喷嘴温度场和热压耦合的计算模拟。【结果】整体结构的最大形变量为0.31 mm,最大应力为6.415 MPa;螺杆和料筒内的颗粒料流速稳定,无回流和溢出的现象;喷嘴出入口的温差为1.1℃,对应形变量为0.048 mm。【结论】经过上述仿真分析可得出,该结构可以在保证刚性的前提下,实现聚乳酸颗粒料的连续均匀挤出,对桌面级单螺杆挤出设备的可行性提供了一定的理论支撑。

关键词：结构设计 3D打印有限元仿真线材挤出 PLA

维普期刊数据库博看期刊

Tuberculosis screening among children and adolescents in China:insights from a mathematical model

在线全文

学校读者我要写书评

暂无评论

Intelligent Medicine 2023年第3期3卷 157-163页

作者： Janne Estill Yangqin Xu Shouyuan Wu Lidong Hu Nan Yang Shu Yang Yaolong Chen guobao Li Evidence-Based Medicine Center School of Basic Medical SciencesLanzhou UniversityLanzhouGansu 730000China Institute of Global Health University of GenevaGenevaSwitzerland School of Public Health Lanzhou UniversityLanzhouGansu 730000China Department of Rheumatology and Immunology The First Medical CenterChinese PLA General HospitalBejing 100853China College of Medical Information Engineering Chengdu University of Traditional Chinese MedicineChengduSichuan 610000China Research Unit of Evidence-Based Evaluation and Guidelines Chinese Academy of Medical Sciences(2021RU017)School of Basic Medical SciencesLanzhou UniversityLanzhouGansu 730000China Lanzhou University Institute of Health Data Science LanzhouGansu 730000China WHO Collaborating Centre for Guideline Implementation and Knowledge Translation LanzhouGansu 730000China Department of Lung Disease Shenzhen Third People's HospitalThe Second Affiliated HospitalSouthern University of Science and TechnologyShenzhen Guangdong 518112China

Background Tuberculosis(TB)continues to be prevalent in China also among children and adolescents in *** built a dynamic mathematical model for TB transmission in China,and applied it to compare the epidemic trends 2021–2030 under a range of screening interventions focusing on children and *** We developed a dynamic mathematical model with a flexible *** model can be applied either stochastically or deterministically,and can encompass arbitrary age structure and resistance *** the present version,we used the deterministic version excluding resistance but including age structure with six groups:0–5,6–11,12–14,15–17,18–64,and 65 years and *** parameterized the model by literature data and fitting it to case and death estimates provided by the World Health *** compared the new TB cases and TB-related deaths in each age group over the period 2021–2030 in 10 scenarios that involved intensified screening of particular age groups of children,adolescents,or young adults,or decreased or increased diagnostic accuracy of the *** Screening the entire age class of 18-year-old persons would prevent 517,000 TB cases and 14,600 TB-related deaths between years 2021 and 2030,corresponding to 6.6%and 5.5%decrease from the standard of care projection,*** screening of children aged 6–11 and,to a lesser extent,0–5 years,also reduced TB incidence and mortality,particularly among children of the respective ages but also in other age *** contrast,intensified screening of adolescents did not have a major *** with a simpler and less accurate method resulted in worsened outcomes,which could not be offset by more intensive *** accurate screening and better sensitivity to detect latent TB could prevent 2.3 million TB cases and 68,500 TB deaths in the coming 10 *** Routine screening in schools can efficiently reduce the burden of TB in *** should be intensifie

关键词： Tuberculosis China Children and adolescents Mathematical model Screening

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

二等水准加密重力测量与数据处理

青海科技 2024年第3期31卷 51-57页

作者：王春青赵利江马国宝王祖顺青海省基础测绘院西宁810000

在青海省二等水准测量工作中,由于水准路线平均海拔高、高差大,大范围开展了加密重力测量工作。文章分析了二等水准路线上开展加密重力测量工作时的布点、观测以及数据处理方法,并尝试编写了加密重力测量数据处理程序,以期研究成果对其... 详细信息

在青海省二等水准测量工作中,由于水准路线平均海拔高、高差大,大范围开展了加密重力测量工作。文章分析了二等水准路线上开展加密重力测量工作时的布点、观测以及数据处理方法,并尝试编写了加密重力测量数据处理程序,以期研究成果对其他地区开展加密重力测量工作提供借鉴参考。

关键词：重力测量加密平差

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

表情识别技术在铁路售票窗口中的应用

智能计算机与应用 2021年第3期11卷 106-108页

作者：于存江杨龙标丁笑颖颜成伟周国宝长春大学电子信息工程学院长春130022

针对铁路窗口售票服务质量的问题,提出一种售票窗口服务质量的表情识别监测系统。该系统通过售票窗口外侧的摄像头检测到人脸图像时,表情监测系统每隔一定的时间就会通过安装在售票窗口内的摄像头获取监控范围内的帧图像信息,由表情识... 详细信息

针对铁路窗口售票服务质量的问题,提出一种售票窗口服务质量的表情识别监测系统。该系统通过售票窗口外侧的摄像头检测到人脸图像时,表情监测系统每隔一定的时间就会通过安装在售票窗口内的摄像头获取监控范围内的帧图像信息,由表情识别监测系统对图像进行处理和识别,将识别后的结果进行数据统计。基于表情识别技术的监测系统在铁路售票窗口的应用,不仅能够提高售票员的服务质量,也能够让旅客在购票的过程中体验到舒适感。

关键词：表情识别铁路售票监测服务质量

Gap engineering of sandwich plasmonic gap nanostructures for boosting plasmon-enhanced electrocatalysis

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 8961-8969页

作者： Lu Cheng Fengxia Wu Yu Tian Xiali Lv Fenghua Li guobao Xu Hsien-Yi Hsu Yongjun Zhang Wenxin Niu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Yanshan Branch of Beijing Chemical Research Institute SinopecBeijing 102500China University of Science and Technology of China Hefei 230026Chin a 4 School of Energy and Environment Department of Materials Science and EngineeringCity University of Hong KongKowloon TongHong Kong 999077China Shenzhen Research Institute of City University of Hong Kong Shenzhen 518057China Key Laboratory of Functional Polymer Materials and State Key Laboratory of Medicinal Chemical Biology Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China

Plasmonic catalysis is emerging as a dynamic field in heterogeneous catalysis and holds great promise for the efficient utilization of solar *** to the development of plasmonic catalysis is the design of efficient plasmonic *** this report,plasmonic gap nanostructures(PGNs)on the basis of Au@poly(o-phenylenediamine)(POPD)@Pd sandwich nanostructures are synthesized as plasmonic nanocatalysts by an in-situ reduction synthetic strategy,which allows for the precise engineering of the POPD gap size between plasmonic Au and catalytic Pd *** introduction of conducting POPD nanogap in PGNs not only effectively enhances their light harvesting capability,but also provides an effective charge transfer channel for harnessing the photogenerated hot charge *** this respect,distinct gap-dependent performances in plasmon-enhanced electrocatalysis of ethanol oxidation reactions(EOR)are demonstrated with the PGN nanocatalysts and over 2.5 folds of enhancement can be achieved.A volcano plot is derived to describe the relationship between the catalytic activities and gap size of the PGN nanocatalysts,which is well explained by the interplay of their light harvesting and charge transport *** results highlight the importance of gap engineering in PGNs for plasmonic catalysis and offer the promise of developing efficient plasmonic nanocatalysts for other heterogeneous catalytic reactions.

关键词： plasmonic gap nanostructures electrocatalysis ethanol oxidation reactions light harvesting charge transport

Preparation of Quaternary FeCoMoCu Metal Oxides for Oxygen Evolution Reaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2022年第3期38卷 823-828页

作者： HAO Zhimin LIU Dapeng GE Huaiyun ZUO Xintao FENG Xilan SHAO Mingzhe YU Haohan YUAN guobao ZHANG Yu Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing100191P.R.China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing100191P.R.China

Molybdenum doping is an effective way to improve the oxygen evolution reaction(OER)properties of catalysts,which can efficiently improve the electronic conductivity,mass transport process,and intrinsic activity of transition metal oxides or hydroxides,especially for those multi-component oxides with more abundant active ***,we have prepared a quaternary FeCoMoCu metal oxide on Cu foam(FeCoMoCuO_(x)@Cu)as an efficient OER *** expected,FeCoMoCuO_(x)@Cu could exhibit a low overpotential(252 mV at the current density of 10 mA/cm^(2))and exceptional stability(10000 cycles of CV scans or constant electrolysis for 48 h).

关键词： Oxygen evolution reaction(OER) Electrocatalysis Transition metal oxide Molybdenum doping