检索结果-南通市图书馆

The　Dynamic　Behaviour　Analysis　of　Up－Conversion　Luminescence　in　ErP5O14　Glass

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1995年第1期B4卷 73-80页

作者： chen Jinkai chen Xiaobo HUANG Zhiwei YANG Wenqing(Experiment Center,fujian normal university, fuzhou 350007,china Physics department,Nankai university,Tian jing 300071,china) fujian normal Univ Fuzhou China

ＴｈｅＤｙｎａｍｉｃＢｅｈａｖｉｏｕｒＡｎａｌｙｓｉｓｏｆＵｐ－ＣｏｎｖｅｒｓｉｏｎＬｕｍｉｎｅｓｃｅｎｃｅｉｎＥｒＰ５Ｏ１４ＧｌａｓｓＴｈｅＤｙｎａｍｉｃＢｅｈａｖｉｏｕｒＡｎａｌｙｓｉｓｏｆＵｐ－Ｃｏｎｖｅｒｓｉ... 详细信息

ＴｈｅＤｙｎａｍｉｃＢｅｈａｖｉｏｕｒＡｎａｌｙｓｉｓｏｆＵｐ－ＣｏｎｖｅｒｓｉｏｎＬｕｍｉｎｅｓｃｅｎｃｅｉｎＥｒＰ５Ｏ１４ＧｌａｓｓＴｈｅＤｙｎａｍｉｃＢｅｈａｖｉｏｕｒＡｎａｌｙｓｉｓｏｆＵｐ－ＣｏｎｖｅｒｓｉｏｎＬｕｍｉｎｅｓｃｅｎｃｅ...

关键词： ErP5O(14) glass up-conversion three photon luminescence

Geometric double-entity model for recognizing far-near relations of clusters

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2011年第10期54卷 2040-2050页

作者： WANG KaiJun ,YAN XuanHui & chen LiFei School of mathematics and Computer Science,fujian normal university,fuzhou 350108,china 1. School of mathematics and Computer Science Fujian Normal University Fuzhou 350108 China

When solving many practical problems,we not only need sample labels given by a clustering algorithm,but also rely on the recognition of far-near relations of *** the difficult condition of many clusters in a high-dimensional data set,the clustering visualization methods based on dimension reductions usually produce the phenomena,e.g.,some clusters are overlapping,interlacing,or pushed away;as a result,the far-near relations of some clusters are displayed wrongly or cannot be *** existing inter-cluster distance methods cannot determine whether two clusters are far away or *** geometric double-entity model method (GDEM) is proposed to describe far-near relations of clusters,and the methods such as the relative border distance,absolute border distance and region dense degree are designed to measure far-near degrees between *** pays attention to both the absolute distance between nearest sample sets and the dense degrees of border regions of two clusters,and it is able to uncover accurately far-near relations of clusters in a high-dimensional space,especially under the difficult condition mentioned *** experimental results on four real data sets show that the proposed method can effectively recognize far-near relations of clusters,while the conventional methods cannot.

关键词： geometric double-entity model far-near relations of clusters distance between clusters partitional clustering algorithms

Up-conversion luminescence phenomenon of Er3+ ions in ErP5O14 noncrystal glass

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1992年第5期 7-11页

作者： Xiaobo chen, Jinhai chen (Physics department, Nankai university,Tianjin 300071 china) Experiment Center, fujian normal university,fuzhou 350007 china

The up-conversion luminescence phenomenon was observed in ErP5O14noncrys-tal glass induced by pulsed DCM dye *** on the difference between up-conversion ex-citation spectrum and absorption of ~4F9/2and dependence of up-conversion fluorescence inten-sity on the exciting wavelength,it is found that the mechanism of up-conversion from ~4F9/2level of ErP5O14noncrystal glass can not be ascribed to energy transfering between Er3+ions,a seguential absorption of two photons by a single ion should be responsible for these process.

关键词： ErP5O14 noncrystal glass up-conversion fluorescence

La_2O_3-ZSM-5分子筛催化氯苯水解制苯酚

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

石油化工 1998年第4期27卷 241-243页

作者：郑瑛林深陈守正福建师范大学化学系

用ＺＳＭ－５分子筛为载体，浸渍法负载制备Ｌａ２Ｏ３－ＺＳＭ－５分子筛催化剂，用ＸＲＤ、ＮＨ３－ＴＰＤ、ＸＰＳ等方法对催化剂的物化性能进行表征。考察了该催化剂对氯苯气相水解制苯酚反应的催化活性。试验结果表明，当反应温度... 详细信息

用ＺＳＭ－５分子筛为载体，浸渍法负载制备Ｌａ２Ｏ３－ＺＳＭ－５分子筛催化剂，用ＸＲＤ、ＮＨ３－ＴＰＤ、ＸＰＳ等方法对催化剂的物化性能进行表征。考察了该催化剂对氯苯气相水解制苯酚反应的催化活性。试验结果表明，当反应温度４６０℃、氯苯ＷＨＳＶ＝０．７４ｈ－１时，苯酚收率可达４７．９０％，超过文献报道的共沉淀法制备磷酸镧铜催化剂和ＡｌＰＯ４－５分子筛负载磷酸镧铜催化剂的活性，而且催化剂的热稳定性好，活性衰退慢，具有良好的催化性能，可望有较好的应用价值。

关键词：分子筛催化氯苯水解苯酚

在线全文

学校读者我要写书评

暂无评论

英国教师伙伴学校及其质量保证

外国教育研究 2005年第8期32卷 16-19页

作者：谌启标福建师范大学教育科学与技术学院福建福州350007

20世纪90年代以来,英国教师职前教育体系变革的亮点在于大学与基础学校建立伙伴协约关系,即“教师伙伴学校”,并且越来越强调教师培养的质量保证。文章主要以诺丁汉大学教师伙伴学校为例,特别介绍“教师伙伴学校”导师的角色与培训,以... 详细信息

20世纪90年代以来,英国教师职前教育体系变革的亮点在于大学与基础学校建立伙伴协约关系,即“教师伙伴学校”,并且越来越强调教师培养的质量保证。文章主要以诺丁汉大学教师伙伴学校为例,特别介绍“教师伙伴学校”导师的角色与培训,以及相应的质量保证机制。

关键词：英国教师伙伴学校质量保证教师职前教育体系

在线全文

学校读者我要写书评

暂无评论

关于Banach空间最小系的扩充

数学学报（中文版） 2004年第1期47卷 35-40页

作者：钟怀杰陈剑岚福建师范大学数学系福州350007

本文就可分Banach空间中元素的最小序列(也称双直交序列)可以扩充到在全空间中完备这一事实,说明在空间不可分情况下,对于由不可数个元素组成的所谓最小系,这种完备性扩充未必可行.此外,还应用最小序列扩充性质给出可分的遗传不可分解... 详细信息

本文就可分Banach空间中元素的最小序列(也称双直交序列)可以扩充到在全空间中完备这一事实,说明在空间不可分情况下,对于由不可数个元素组成的所谓最小系,这种完备性扩充未必可行.此外,还应用最小序列扩充性质给出可分的遗传不可分解空间的一个特征刻画.

关键词： Banach空间最小序列完备最小系

Investigation on Technique for Ethylene Preparation via Catalyzed in Fluidized Bed Dehydration of Bioethanol

在线全文

学校读者我要写书评

暂无评论

china Petroleum Processing & Petrochemical Technology 2009年第4期11卷 38-41页

作者： Liu Kewei~(1,2) Yan Guiyang~1 Hong Aizhu~(1,2) Xiao Junfeng~(1,2) Xiao Liren~(1,2) chen Qinghua~(1,2) (1.College of Chemistry and Materials Science,fujian normal university,fuzhou 350007 2.fujian Modified Plastic Research & Development Technology Base) College of Chemistry and Materials Science Fujian Normal University Fuzhou 350007 China fujian Modified Plastic Research and Development Technology Base China

The V-P/HZSM-5 catalyst was prepared by impregnation method using HZSM-5 zeolite as the *** catalytic activity was examined on dehydration of bio-ethanol in a self-designed fluidized bed reactor to manufacture ethylene. The effects of dehydration conditions on catalytic behaviors were *** results showed that the V-P/HZSM-5 catalyst demonstrated good activity for bio-ethanol *** bio-ethanol conversion and ethylene selectivity were over 90%under the following reaction conditions:a P/V atomic ratio of 7.5,a catahst calcination temperature of 300℃,a reaction temperature of 220℃,a bio-ethanol flow rate of 0.1 mL/*** a catalyst dosage of 3.0 ***,the catalyst exhibited excellent catalytic stability and regeneration capability.

关键词： biology ethanol V-P/HZSM-5 fluid bed dehydration ethylene

Effect　of　Cationic　Valence　State　on　Formation　of　Defects　inCrystal　of　Thallium　Hydrogen　Phthalate（TAP）

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 1996年第2期15卷 130-133页

作者： Guan Tie-Tang Lin Shu-Kun chen Yi-Pin (department of Chemistry,fuzhou university,fuzhou 350002) Zhao Qing-Lan Huang Yi-Shen (fujian Institute of Research on the Structure of Matter,Academia Sinica fuzhou 350002) department of Chemistry Fuzhou University Fuzhou 350002 fujian Inst. Res. Struct. of Matter Academia Sinica Fuzhou 350002

ＥｆｆｅｃｔｏｆＣａｔｉｏｎｉｃＶａｌｅｎｃｅＳｔａｔｅｏｎＦｏｒｍａｔｉｏｎｏｆＤｅｆｅｃｔｓｉｎＣｒｙｓｔａｌｏｆＴｈａｌｌｉｕｍＨｙｄｒｏｇｅｎＰｈｔｈａｌａｔｅ（ＴＡＰ）￥ＧｕａｎＴｉｅ－Ｔａｎｇ；ＬｉｎＳｈ... 详细信息

ＥｆｆｅｃｔｏｆＣａｔｉｏｎｉｃＶａｌｅｎｃｅＳｔａｔｅｏｎＦｏｒｍａｔｉｏｎｏｆＤｅｆｅｃｔｓｉｎＣｒｙｓｔａｌｏｆＴｈａｌｌｉｕｍＨｙｄｒｏｇｅｎＰｈｔｈａｌａｔｅ（ＴＡＰ）￥ＧｕａｎＴｉｅ－Ｔａｎｇ；ＬｉｎＳｈｕ－Ｋｕｎ；ＣｈｅｎＹｉ－Ｐｉｎ；...

关键词： organic crystal thallium hydrogen phthalate(TAP) cationic valence state crystal defect

Atmospheric oxidation capacity and O_(3) formation in a coastal city of southeast china:Results from simulation based on four-season observation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第2期136卷 68-80页

作者： Gaojie chen Taotao Liu Jinsheng chen Lingling Xu Baoye Hu chen Yang Xiaolong Fan Mengren Li Youwei Hong Xiaoting Ji Jinfang chen Fuwang Zhang Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key Lab of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China university of Chinese Academy of Sciences Beijing 100049China Minnan normal university Zhangzhou 363000China College of Harbour and Coastal Engineering Jimei UniversityXiamen 361021China Environmental Monitoring Center of fujian Fuzhou 350013China

The pollution of atmospheric ozone in china shows an obvious upward trend in the past ***,the studies on the atmospheric oxidation capacity and O_(3)formation in four seasons in the southeastern coastal region of china with the rapid urbanization remain ***,a four-season field observation was carried out in a coastal city of southeast china,using an observation-based model combining with the Master Chemical Mechanism,to explore the atmospheric oxidation capacity(AOC),radical chemistry,O_(3)formation pathways and *** results showed that the average net O_(3)production rate(14.55 ppbv/hr)in summer was the strongest,but the average O_(3)concentrations in autumn was *** AOC and ROx levels presented an obvious seasonal pattern with the maximum value in summer,while the OH reactivity in winter was the highest with an average value of 22.75 sec^(-1).The OH reactivity was dominated by oxygenated VOCs(OVOCs)(30.6%-42.8%),CO(23.2%-26.8%),NO_(2)(13.6%-22.0%),and alkenes(8.4%-12.5%)in different *** photolysis dominated OH primary source on daytime in winter,while in other seasons,HONO photolysis in the morning and ozone photolysis in the afternoon contributed *** analysis indicated that O_(3)production was controlled by VOCs in spring,autumn and winter,but a VOC-limited and NOx-limited regime in summer,and alkene and aromatic species were the major controlling factors to O_(3)***,the study characterized the atmospheric oxidation capacity and elucidated the controlling factors for O_(3)production in the coastal area with the rapid urbanization in china.

关键词： Atmospheric oxidation capacity Radical chemistry Ozone production Sensitivity analysis