检索结果-南通市图书馆

Chinese Journal of Chemistry 2015年第2期33卷 292-297页

作者： Zheng Li Siyu Zuo jingjian zhou Xiao Yuan Yishan Song Hua Zhang Department of Chemistry College of Food Science&TechnologyShanghai Ocean UniversityShanghai 201306China State Key Laboratory of Pollution Control and Resources Reuse Tongji UniversityShanghai 200092China

Ligand N^(2),N^(6)-bis(2-hydroxyethyl)pyridine-2,6-dicarboxamide(L=BHPC)was synthesized and used to construct lanthanide-based mesoporous material *** the structure of resulting Eu-L-MCM-41,Eu^(3+)was chelated by BHPC,and the Eu-L complexes were anchored into the forming MCM-41 host by the reaction between the hydroxyl group and active *** mesoporous material Eu-L-MCM-41 was characterized by UV,IR,small-angle X-ray diffraction(SAXRD)patterns,nitrogen adsorption/desorption isotherms,TGA and fluorescence *** results indicate that ligand and Eu^(3+) have been introduced into the MCM-41 host,and Eu-L-MCM-41 exhibits characteristic luminescence of Eu^(3+).

关键词： lanthanide mesoporous material luminescence

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

30例肾脏肿瘤患者超声诊断研究

临床医学工程 2011年第11期18卷 1683-1684页

作者：曾艾周经建新疆医科大学第六附属医院新疆乌鲁木齐830002

目的对肾脏肿瘤患者超声诊断方法进行研究。方法回顾分析术前超声检查的肾脏肿瘤30例。结果 30例患者中,定位符合率为93.33%,良恶性定位符合率90%。结论彩色多普勒超声对肾脏良恶性肿瘤的鉴别诊断,准确率高,费用低廉,是首选的诊断方法。

关键词：肾脏肿瘤超声诊断

超声弹性成像分级法及应变比值法诊断甲状腺良恶性肿块的价值研究

在线全文

学校读者我要写书评

暂无评论

中国继续医学教育 2015年第13期7卷 46-47页

作者：张旋周经建何梅新疆医科大学第六附属医院超声科 830002

目的探讨超声弹性成像分级法及应变比值法诊断甲状腺良恶性肿块价值。方法选取我院甲状腺肿块患者24例,分为对照组和观察组,比较两组患者诊断正确率情况。结果经过诊断之后,观察组患者的正确率高于对照组患者,P<0.05,差异具有统计学意... 详细信息

目的探讨超声弹性成像分级法及应变比值法诊断甲状腺良恶性肿块价值。方法选取我院甲状腺肿块患者24例,分为对照组和观察组,比较两组患者诊断正确率情况。结果经过诊断之后,观察组患者的正确率高于对照组患者,P<0.05,差异具有统计学意义。结论超声弹性成像应变比值法诊断的正确性高于超声弹性成像分级法,应用价值高。

关键词：超声弹性成像分级法超声弹性成像应变比值法甲状腺良恶性肿块价值研究

在线全文

学校读者我要写书评

暂无评论

公共场所卫生监督情况分析

中国卫生工程学 2002年第2期1卷 83-84页

作者：李皖宁林颖周京建辽宁省卫生监督所沈阳110005 辽宁省沈阳市和平区卫生防疫站

沈阳市卫生监督所管辖的公共场所有3 967户.根据《公共场所卫生管理条例》(简称《条例》)及《公共场所卫生管理条例实施细则》(简称《细则》)的要求,我们对沈阳市公共场所进行了卫生监督、监测,现将情况分析如下:

关键词：公共场所沈阳市卫生标准卫生监督卫生监测

遥感影像技术应用于农村道路识别的方法比较研究

在线全文

学校读者我要写书评

暂无评论

中阿科技论坛（中英文） 2024年第11期 73-77页

作者：周景健张社国祝海峰 92999 北京100094

随着摄影测量与遥感技术快速发展,高分辨率遥感影像已经成为一种获取基础地理信息数据的重要手段,在农村道路识别中展现出巨大的潜力。文章运用高分辨率遥感影像技术,结合语义分割方法,有效实现了在复杂地表环境中的农村道路精准识别,... 详细信息

随着摄影测量与遥感技术快速发展,高分辨率遥感影像已经成为一种获取基础地理信息数据的重要手段,在农村道路识别中展现出巨大的潜力。文章运用高分辨率遥感影像技术,结合语义分割方法,有效实现了在复杂地表环境中的农村道路精准识别,并在此基础上深入比较了FCN-8s与U-Net两种模型的性能。通过Google地图获取的广泛地貌农村道路遥感影像,经Labelme精细标注与预处理,构建了专用数据集。采用8∶2的训练验证比例,对两种模型进行迭代训练与即时验证,依据农村道路与背景地物的空间关系,采用交叉熵损失值及均交并比mIo U作为核心评价指标。结果显示,U-Net模型展现出显著优势,mIo U高达92.90%,较FCN(90.37%)提升2.53个百分点,表明U-Net以其卓越的稳定性与识别精度,在农村道路遥感影像识别任务中表现更佳。

关键词：遥感影像技术农村道路识别深度学习模型构建

基于SEER数据库分析原发性年轻宫颈腺癌临床病理特点及预后

在线全文

学校读者我要写书评

暂无评论

肿瘤预防与治疗 2020年第2期33卷 140-146页

作者：彭靓曹保娣杜雨璇王晓晖周景俭景德镇市第二人民医院妇科江西景德镇333000 景德镇市第二人民医内分泌保健科江西景德镇333000 赣南医学院第一附属医院妇产科江西赣州341000

目的:分析原发性年轻(年龄≤40岁)宫颈腺癌患者的临床指标、病理学指标和预后差异,探讨原发性年轻宫颈腺癌患者预后的影响因素。方法:通过SEER数据库获取资料,比较年轻组(年龄≤40岁)和中老年组(年龄>40岁)的人口学信息、临床指标和病... 详细信息

目的:分析原发性年轻(年龄≤40岁)宫颈腺癌患者的临床指标、病理学指标和预后差异,探讨原发性年轻宫颈腺癌患者预后的影响因素。方法:通过SEER数据库获取资料,比较年轻组(年龄≤40岁)和中老年组(年龄>40岁)的人口学信息、临床指标和病理指标,采用Kaplan-Meier法计算宫颈腺癌患者总生存率,采用Log-rank检验和COX回归分析宫颈腺癌患者生存的影响因素。结果:共纳入6 320例宫颈腺癌患者的资料进行分析,宫颈腺癌发病例数占所有宫颈癌患者的18.47%,而年轻组患者约占总宫颈腺癌患者的1/3。年轻组与中老年组宫颈腺癌患者的婚姻状态、种族、FIGO分期、肿瘤大小、分化程度、是否放疗方面差异有统计学意义(均P0.05)。通过COX回归模型分析,年龄、婚姻状况、种族、疾病分期、肿瘤大小、分化程度和病理类型为影响宫颈腺癌预后的因素(均P0.05)。结论:年轻宫颈腺癌与中老年宫颈腺癌相比,恶性程度更低、分期较早、分化程度较高,预后较中老年宫颈腺癌好。但年轻宫颈腺癌发病率高,仍需要引起重视。

关键词：宫颈腺癌年轻临床病理特征预后分析

Novel Method for Evaluating the Aging of Aviation Turbine Engine Oils via High-Temperature Bearing Deposit Tests

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 67-77页

作者： Hao Lichun Yang He Song Haiqing zhou Yunfan He jingjian Liang Yuxiang SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083

Aviation turbine engine oils require excellent thermal-oxidative stability because of their high-temperature ***-temperature bearing deposit testing is a mandatory method for measuring the thermal-oxidative performance of aviation lubricant oils,and the relevant apparatus was improved in the present *** different commercial aviation turbine engine oils were tested,one with standard performance(known as the SL oil)and the other with high thermal stability,and their thermal-oxidative stability characteristics were *** 100 h of high-temperature bearing testing,the SL oil was analyzed by using various analytical techniques to investigate its thermal-oxidative process in the bearing test,with its thermal-oxidative degradation mechanism also being *** results indicate that the developed high-temperature bearing apparatus easily meets the test requirements of method 3410.1 in standard *** viscosity and total acid number(TAN)of the SL oil increased with the bearing test time,and various deposits were produced in the bearing test,with the micro-particles of the carbon deposits being sphere-like,rod-like,and sheet-like in *** antioxidant additives in the oil were consumed very rapidly in the first 30 h of the bearing test,with N-phenyl-1-naphthylamine being consumed faster than ***,the oil thermal-oxidative process involves very complex physical and chemical mechanisms.

关键词： aviation turbine engine oil high-temperature bearing deposit test thermal-oxidative degradation antioxidant additives

Adsorption of Cr(Ⅲ) from acidic solutions by crop straw derived biochars

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第10期25卷 1957-1965页

作者： jingjian Pan Jun Jiang Renkou Xu State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences College of Resource and Environment Nanjing Agricultural University

Cr（Ⅲ） adsorption by biochars generated from peanut, soybean, canola and rice straws is investigated with batch methods. Adsorption of Cr（Ⅲ） increased as pH rose from 2.5 to 5.0. Adsorption of Cr（Ⅲ） led to peak position shifts in the FFIR-PAS spectra of the biochars and made zeta potential values less negative, suggesting the formation of surface complexes between Cr^3＋ and functional groups on the biochars. The adsorption capacity of Cr（Ⅲ） followed the order： peanut straw char 〉 soybean straw char 〉 canola straw char 〉 rice straw char, which was consistent with the content of acidic functional groups on the biochars. The increase in Cr^3＋ hydrolysis as the pH rose was one of the main reasons for the increased adsorption of Cr（Ⅲ） by the biochars at higher pH values. Cr（llI） can be adsorbed by the biochars through electrostatic attraction between negative surfaces and Cr^3＋, but the relative contribution of electrostatic adsorption was less than 5%. Therefore, Cr（Ⅲ） was mainly adsorbed by the biochars through specific adsorption. The Langumir and Freundlich equations fitted the adsorption isotherms well and can therefore be used to describe the adsorption behavior of Cr（Ⅲ） by the crop straw biochars. The crop straw biochars have great adsorption capacities for Cr（Ⅲ） under acidic conditions and can be used as adsorbents to remove Cr（Ⅲ） from acidic wastewaters.

关键词： biochar crop straw Cr(Ⅲ) adsorption functional groups zeta potential

On Pentavalent Arc-Transitive Graphs

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2018年第2期25卷 189-202页

作者： jingjian Li Jicheng Ma College of Mathematics and Information Science Guangxi University Nanning 530004 China Guangxi Colleges and Universities Key Laboratory of Mathematics and Its Applications Nanning 530003 China Chongqing Key Laboratory of Group & Graph Theories and Applications Chongqing University of Arts and Sciences Chongqing 402160 China

In this paper, a characterization of all pentavalent arc-transitive graphs is given. It is shown that each pentavalent arc-transitive covering graph F is a regular simple or elementary abelian covering graph. In parti... 详细信息

关键词： arc-transitive graph pentavalent graph covering graph

Prophet_TD Routing Algorithm Based on Historical Throughput and Encounter Duration

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

Computers, Materials & Continua 2020年第9期64卷 1845-1858页

作者： jingjian Chen Gang Xu Fengqi Wei Liqiang He College of Computer Science Inner Mongolia UniversityHuhehot010000China Geomechanica Inc. TorontoM5H 2Y2Canada

Opportunistic networks are self-organizing networks that do not require a complete path between the source node and the destination node as it uses encounter opportunities brought by nodes movement to achieve network *** networks routing algorithms are numerous and can be roughly divided into four categories based on different forwarding *** Prophet routing algorithm is an important routing algorithm in opportunistic *** forwards messages based on the encounter probability between nodes,and has good innovation significance and optimization ***,the Prophet routing algorithm does not consider the impact of the historical throughput of the node on message transmission,nor does it consider the impact of the encounter duration between nodes on message ***,to improve the transmission efficiency of opportunistic networks,this paper based on the Prophet routing algorithm,fuses the impact of the historical throughput of the node and the encounter duration between nodes on message transmission at the same time,and proposes the Prophet_TD routing algorithm based on the historical throughput and the encounter *** paper uses the Opportunistic Networks Environment v1.6.0(the ONE v1.6.0)as the simulation platform,controls the change of running time and the number of nodes respectively,conducts simulation experiments on the Prophet_TD routing *** simulation results show that compared to the traditional Prophet routing algorithm,on the whole,the Prophet_TD routing algorithm has a higher message delivery rate and a lower network overhead rate,and its average latency is also lower when node density is large.

关键词： Opportunistic networks encounter probability historical throughput encounter duration