检索结果-南通市图书馆

Journal of Environmental Sciences 2024年第6期140卷 157-164页

作者： Xiaofeng Cui Xueting Wang lijun zhao Jixin Wang Tingting Kong Yujie Xiong Anhui Engineering Research Center of Carbon Neutrality The Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Laboratory of Molecular-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China School of Chemistry and Chemical Engineering Anqing Normal UniversityAnqing 246011China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China

Homogenous molecular photocatalysts for CO_(2)reduction,especially metal complex-based photosensitizer-catalyst assemblages,have been attracting extensive research interests due to their efficiency and ***,their low durability and recyclability limit practical *** this work,we immobilized the catalysts of metal terpyridyl complexes and the photosensitizer of[Ru(bpy)3]Cl2onto the surface of carbon nanotubes through covalent bonds and electrostatic interactions,respectively,transforming the homogeneous system into a heterogeneous *** characterizations prove that these metal complexes are well dispersed on CNTs with a high loading(ca.12 wt.%).Photocatalytic measurements reveal that catalytic activity is remarkably enhanced when the molecular catalysts are anchored,which is three times higher than that of homogeneous molecular ***,when the photosensitizer of[Ru(bpy)3]Cl2is immobilized,the side reaction of hydrogen evolution is completely suppressed and the selectivity for CO production reaches 100%,with its durability also significantly *** work provides an effective pathway for constructing heterogeneous photocatalysts based on rational assembly of efficient molecular photosensitizers and catalysts.

关键词： durability selectivity catalyst

Method for the fruit tree recognition and navigation in complex environment of an agricultural robot

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2024年第2期17卷 221-229页

作者： Xiaolin Xie Yuchao Li lijun zhao Xin Jin Shengsheng Wang Xiaobing Han College of Agricultural Equipment Engineering Henan University of Science and TechnologyLuoyang 471003HenanChina Collaborative Innovation Center of Machinery Equipment Advanced Manufacturing of Henan Province Luoyang 471003HenanChina Longmen Laboratory Luoyang 471003HenanChina College of Intelligent and Manufacturing Engineering Chongqing University of Arts and SciencesChongqing 402160China

To realize the visual navigation of agricultural robots in the complex environment of orchards,this study proposed a method for fruit tree recognition and navigation based on *** YOLOv5s model was selected and trained to identify the trunks of the left and right rows of fruit trees;the quadratic curve was fitted to the bottom center of the fruit tree recognition box,and the identified fruit trees were divided into left and right columns by using the extreme value point of the quadratic curve to obtain the left and right rows of fruit trees;the straight-line equation of the left and right fruit tree rows was further solved,the median line of the two straight lines was taken as the expected navigation path of the robot,and the path tracing navigation experiment was carried out by using the improved LQR control *** experimental results show that under the guidance of the machine vision system and guided by the improved LQR control algorithm,the lateral error and heading error can converge quickly to the desired navigation path in the four initial states of[0 m,−0.34 rad],[0.10 m,0.34 rad],[0.15 m,0 rad]and[0.20 m,−0.34 rad].When the initial speed was 0.5 m/s,the average lateral error was 0.059 m and the average heading error was 0.2787 rad for the navigation trials in the four different initial *** average driving was 5.3 m into the steady state,the average value of steady state lateral error was 0.0102 m,the average value of steady state heading error was 0.0253 rad,and the average relative error of the robot driving along the desired navigation path was 4.6%.The results indicate that the navigation algorithm proposed in this study has good robustness,meets the operational requirements of robot autonomous navigation in orchard environment,and improves the reliability of robot driving in orchard.

关键词： fruit tree recognition visual navigation YOLOv5 complex environments orchards

Spatial-Temporal Analysis of Drinking Water Type of Endemic Fluorosis—China,2009–2022

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2024年第2期6卷 25-29页

作者： lijun zhao Zhe Li Mang Li Hongna Sun Wei Wei Lin Gao Qiaoshi zhao Yang Liu Xiaohong Ji Cheng Li Jian Wang Yanhui Gao Junrui Pei Center for Endemic Disease Control Chinese Center for Disease Control and PreventionHarbin Medical UniversityHarbin CityHeilongjiang ProvinceChina Key Lab of Etiology and Epidemiology Education Bureau of Heilongjiang Province(23618504)Ministry of Health of PRHarbin Medical UniversityHarbin CityHeilongjiang ProvinceChina

What is already known about this topic?Endemic fluorosis,caused by high fluoride levels in drinking water,has been a significant health issue in rural areas of China for many *** is added by this report?There has been a notable decline in the detection rate of dental fluorosis in children aged 8–12 years in drinking water fluorosis areas across the country from 2009 to *** 14 provincial-level administrative divisions are classified as low-probability clusters,Tianjin remains classified as a high-probability *** are the implications for public health practice?The current policy for preventing and controlling endemic fluorosis in China needs *** than focusing solely on regions with high incidence,there should be a shift towards monitoring and early warning of fluoride ***,local containment measures should be intensified.

关键词： intensified Spatial fluoride

A new method of spore separation: preparation of antibiotic modified nanoparticles and its application in spore-vegetative cell mixed system

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年

作者： Mengya Li Shijie Liu Dong Liang Shiliang Guo Miaoyun Li Yaodi Zhu lijun zhao Gaiming zhao Yangyang Ma College of Food Science and Technology， Henan Agricultural University International Joint Laboratory of Meat Processing and Safety in Henan Province， Henan Agricultural University Henan Shuanghui Investment & Development Co.， Ltd.Luohe

Bacterial spores commonly co-exist with vegetative cells， presenting challenges in spore separation and detection. The separation of spores is a crucial process for laboratory research and the detection of spore mechanisms. This study introduced a novel method that leverages the high binding affinity of vancomycin （Van） and ampicillin sodium （Amp） to vegetative cells， integrated with magnetic separation technology， to selectively collect spores from complex environments by eliminating vegetative cells. First， Van/Amp-modified magnetic Fe3O4nanoparticles (Fe3O4NPs) were synthesized and characterized. Subsequently， these nanoparticles bound vegetative cells， forming magnetic conjugates that could be efficiently removed using a magnetic field. Concurrently， spores were collected with an efficiency exceeding 95%， completing the entire process within 30 min and achieving a spore separation efficiency of up to 105CFU/mL. This method was successfully applied to actual samples， including tap water and milk. The state of the collected spores was confirmed using Raman spectroscopy and microscopic techniques， verifying that their characteristics matched those of typical spores. The proposed novel method for rapid spore separation， leveraging the “remove bacterial effect” facilitated by Van/Amp-Fe3O4NPs， showed outstanding spore collection capabilities while preserving the excellent physiological state of spores.

关键词：

高效液相色谱-电感耦合等离子体质谱法同时测定大米中6种砷形态的含量

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

理化检验（化学分册） 2024年第2期60卷 238-241页

作者：赵丽君杭州谱育科技发展有限公司杭州311300

砷(As)是自然界中普遍存在的一种元素。除发现少量自然砷外,砷广泛存在于熔积岩和沉积岩中,通常以许多不同形态的化合物存在。砷的毒性取决于其化学形态和种类[1],常见的砷形态有亚砷酸盐[As(Ⅲ)]、砷酸盐[As(Ⅴ)]、一甲基砷(MMA)、二... 详细信息

砷(As)是自然界中普遍存在的一种元素。除发现少量自然砷外,砷广泛存在于熔积岩和沉积岩中,通常以许多不同形态的化合物存在。砷的毒性取决于其化学形态和种类[1],常见的砷形态有亚砷酸盐[As(Ⅲ)]、砷酸盐[As(Ⅴ)]、一甲基砷(MMA)、二甲基砷(DMA)、砷甜菜碱(AsB)、砷胆碱(AsC)等。研究发现,无机砷的毒性大于有机砷,As(Ⅲ)的毒性大于As(Ⅴ)的,有机砷毒性从大到小排序为MMA、DMA、AsB、AsC[2]。

关键词： As(Ⅲ) As(Ⅴ) 亚砷酸盐砷形态有机砷无机砷砷胆碱二甲基砷

在线全文

学校读者我要写书评

暂无评论

基于断面水边线定向的视频测流摄像机标定

电子与信息学报 2024年第4期46卷 1428-1437页

作者：张振姜天生赵丽君程泽河海大学计算机与信息学院南京211100

针对现有基于直接线性变化法(DLT)的图像法测流技术依赖于地面控制点,存在效率低、风险高、宽断面天然河流操作难度大等问题,该文提出一种基于断面水边线定向的摄像机姿态角标定方法(CSWO)。该方法将标定过程分解为实验室内参标定和现... 详细信息

针对现有基于直接线性变化法(DLT)的图像法测流技术依赖于地面控制点,存在效率低、风险高、宽断面天然河流操作难度大等问题,该文提出一种基于断面水边线定向的摄像机姿态角标定方法(CSWO)。该方法将标定过程分解为实验室内参标定和现场外参标定两步,其中后者又被划分为摄像机定位和定向两个环节。定向环节中首先在摄像机安装时将光轴与断面方向对齐,使方位角置零。然后利用无畸变图像中人工标注的平直断面水边线的斜率计算出横滚角。接下来通过计算水边线与图像纵轴交点作为其亚像素像方坐标。最后依据透视投影成像模型,联合水位与插值断面高程求得的物方坐标解算出俯仰角。该方法应用于时空图像测速法(STIV),实现了200 m宽河流的免像控表面流速测量。结果表明:起点距的最大绝对误差为0.59 m,最大相对误差为0.45%,表面流速的最大相对误差小于6.3%。

关键词：表面流速测量 STIV 免地面控制点摄像机标定断面水边线

基于微调GPT3.5模型的高质量小说生成研究

在线全文

学校读者我要写书评

暂无评论

现代计算机 2024年第5期30卷 67-71页

作者：赵莉珺西藏民族大学信息工程学院咸阳712082

生成型已训练变换模型3.5(GPT3.5)特色小说文本的质量可以通过微调进一步提高,具体是通过美国开放人工智能研究中心(OpenAI)提供的GPT3.5模型的接口并对其进行改进,主要以收集高质量小说文本并对其进行信息提取、生成提示作为API数据的... 详细信息

生成型已训练变换模型3.5(GPT3.5)特色小说文本的质量可以通过微调进一步提高,具体是通过美国开放人工智能研究中心(OpenAI)提供的GPT3.5模型的接口并对其进行改进,主要以收集高质量小说文本并对其进行信息提取、生成提示作为API数据的输入。在微调过程中的细节处理和评估方法,证明了该模型在生成小说方面的优势和局限性。相比于微调中所用到的参数调整等方法而言,提示工程对于模型的调整具有相对大的权重,因此在微调控制方法中提示设计具有重要意义。通过探索高质量小说生成模型,研究机器与小说之美的距离,这对于NLP研究是非常有意义的。

关键词：微调 GPT3.5模型小说文本生成 OpenAI API 提示工程

基于点云数据的切坡建房风险评价——以武汉市低山丘陵区为例

在线全文

学校读者我要写书评

暂无评论

测绘标准化 2024年第1期40卷 140-145页

作者：赵丽君中煤航测遥感集团有限公司陕西西安710199

针对武汉市低山丘陵区的切坡建房风险区,本文采用机载激光雷达(LiDAR)生成坡面山体点云数据,大面积排查区域内的房屋建筑,降低人为参与程度,提高切坡建房判断精度,同时运用区域生长法、坡度计算等方法,结合武汉市地质灾害隐患排查标准,... 详细信息

针对武汉市低山丘陵区的切坡建房风险区,本文采用机载激光雷达(LiDAR)生成坡面山体点云数据,大面积排查区域内的房屋建筑,降低人为参与程度,提高切坡建房判断精度,同时运用区域生长法、坡度计算等方法,结合武汉市地质灾害隐患排查标准,建立武汉市切坡建房风险等级评价体系,并采用点云剖面计算、实地勘察的方式进行准确度验证。结果表明,依据本文算法提取的风险区成果与点云剖面计算、实地勘测的风险等级一致,所得结果与削坡高度、边坡距离、自然坡长的误差分别在-0.2~1 m、-1.3~2.7 m、-1~2 mm之间;坡度误差在-1°~7°之间;容积率误差在-0.07~0.53之间;与实地勘测的拟合度在0.9以上。因此,基于点云数据建立的切坡建房风险等级评价体系可从不同角度对地貌特征进行分析,大大节约人力和物力,为武汉市地质灾害及隐患调查数据的获取提供参考。

关键词：点云数据切坡建房风险评价区域生长法坡度计算

在线全文

学校读者我要写书评

暂无评论

激励政策对我国新能源汽车推广应用的影响

技术经济 2024年第4期43卷 64-74页

作者：王世进蒯乐伊赵丽君江苏师范大学商学院徐州221116 华东理工大学商学院上海200237

新能源汽车在推广过程中,面临着市场失灵问题,不利于新能源汽车产业的长期健康发展,还会导致资源配置效率低下。因此,为了实现资源合理配置,推动新能源汽车产业有序发展,需要政府出台一系列的激励政策。本文从单一政策效果、政策协同效... 详细信息

新能源汽车在推广过程中,面临着市场失灵问题,不利于新能源汽车产业的长期健康发展,还会导致资源配置效率低下。因此,为了实现资源合理配置,推动新能源汽车产业有序发展,需要政府出台一系列的激励政策。本文从单一政策效果、政策协同效果、中介效应等多角度分析激励政策对新能源汽车推广应用的影响,并深入研究激励政策与新能源汽车推广应用之间的非线性关系。根据实证结果,本文得到以下结论:①补贴政策、充电基础设施以及政府购买都能够显著促进新能源汽车推广应用;②人口越多、收入水平越高、环境污染越严重的地方,新能源汽车推广应用程度越大;③政府购买与新能源汽车推广应用之间存在倒U型关系;④企业研发创新能力在激励政策与新能源汽车推广应用之间发挥中介作用;⑤补贴政策的实施效果存在区域性差异,在第一批试点城市,补贴政策的效果不再明显,甚至对新能源汽车推广应用产生了负面影响,而在第二批试点城市中,补贴政策依然能够显著促进新能源汽车推广应用;⑥补贴政策能够显著促进纯电动汽车推广应用,但对插电式混合动力汽车以及燃料电池汽车推广应用表现出负效应。最后,根据研究结果,本文为促进新能源汽车推广应用提供了相关政策建议。

关键词：新能源汽车激励政策政府补贴推广应用

城市建筑高度对热环境的影响——以武汉市武昌区为例

在线全文

学校读者我要写书评

暂无评论

测绘技术装备 2024年第2期26卷 94-98页

作者：赵丽君中煤航测遥感集团有限公司陕西西安710199

热岛效应是指城市相对于周围地区温度显著升高的一种现象。新一轮国土空间规划对城市热岛效应提出了新的要求,指出城市建筑高度是影响城市温度变化的主要因素之一。本文基于Landsat 8热红外遥感数据,利用单窗算法反演地表温度,利用激光... 详细信息

热岛效应是指城市相对于周围地区温度显著升高的一种现象。新一轮国土空间规划对城市热岛效应提出了新的要求,指出城市建筑高度是影响城市温度变化的主要因素之一。本文基于Landsat 8热红外遥感数据,利用单窗算法反演地表温度,利用激光点云数据提取建筑高度成果,按照标准将建筑分为不同的高度段,并将分段后的建筑高度与反演的地表温度相叠加,以分析建筑高度对热岛效应的影响强度。结果表明,武昌区2月份地表温度与建筑高度整体呈正相关关系,9月份地表温度与低层、中层和中高层建筑区间的温度呈上升趋势,高层、超高层建筑区间的温度呈快速下降趋势,说明武昌区冬季时建筑越高,地表温度越高,建筑越保暖;夏季时建筑越高,地表温度越低,高层建筑越散热。

关键词：热岛效应空间分异相关分析激光点云单窗算法