检索结果-南通市图书馆

Photoluminescence Properties of a Promising Red-emitting Phosphor CaNb2O6：Eu3＋ for Trichromatic White Light Emitting Diodes Application

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2011年第3期29卷 441-445页

作者： huang, junli Zhou, Liya He, Xipu Gong, Fuzhong School of Chemistry and Chemical Engineering Guangxi University Nanning Guangxi 530004 China Research and Quality Detection Center Gongdong Evergreen Group Co. Ltd. Zhanjiang Guangdong 524094 China

Motivated by the need for new phosphors of white light emitting diode （WLED） application, Ca0.95Nb2O6： Eu0.05^3＋ phosphors were synthesized by high temperature solid-state reaction. Increasing the content of doped-Eu3-- and adding the co-activator Bi3＋ to improve the photoluminescence （PL） intensity of Ca1-xNb2O6：Eux3＋ phosphors were investigated in detail. The effects of Eu3＋ were better than that of Bi3＋ on the PL intensity of Cal-xNb2O6： Eux3＋ phosphors. Compared with Y2O2S：0.05Eu3＋, the ***0.03 phosphor could be excited efficiently by UV （395 nm） light and emit the red light at 614 nm with line spectra, which were coupled well with the characteristic emission from UV-Near UV LED. The CIE （International Commission on Illumination） chromaticity coordinates （x=0.654, y=0.348） of Ca0.70Nb2O6： 0.03 were close to the NTSC （National Television Standard Committee） standard values. Therefore ***0.03 might find application to UV-Near UV InGaN chip-based white light emitting diodes, which is further proved by the LED fabrication with the ***0.03 phosphor.

关键词： phosphor luminescence X-ray diffraction

Photodegradation of Reactive Dyes by UV／Ferrioxalate／H2O2 System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Technology Letters 2004年第4期10卷 75-78页

作者：王滨松 huang junli Zhang Jie School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 P.R.China School of life science Northeast Forestry University Harbin 150040 P.R.China

Three types of simulated commercial reactive dye wastewater, separately prepared with FN-2BL red, C-R blue and C-2R yellow, were oxidized with UV/ferrioxalate/H2O2 system, especially by the introduction of Fe2+ ion. The experimental results show that the optimized experimental conditions are pH=3.5, [Fe2+]=1mM, H2O2782mg/L for FN-2BL red and C-R blue and H2O2646mg/L for C-2R yellow, t=4h and T=80℃ when the concentration of dye is 400mg/L. Under such conditions, the observed COD and color removal efficiencies are above 94% and 99%, respectively for all the cases. This investigation has provided fundamental information for the treatment of wastewater containing reactive dyes using UV/ferrioxalate/H2O2.

关键词：光降解反应紫外线草酸铁 H2O2 双氧水废水处理工艺染料行业化学需氧量

Inactivation of Cryptosporidium by ozone and cell ultrastructures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第12期22卷 1954-1959页

作者： Zhilin Ran Shaofeng Li junli huang Yixing Yuan Chongwei Cui Craig Denver Williams School of Municipal & Environmental Engineering Harbin Institute of Technology Harbin 150090 China Department of Building & Environmental Engineering Shenzhen Polytechnic Institute Shenzhen 518055 China School of Applied Science University of Wolverhampton Wolverhampton WV1 1LY UK

The fluorescence staining method and scanning electron microscopy （SEM） were used to study the effect of ozone （O3） inactivating Cryptosporidium in water and cell ultrastructures variation to shed light on the mechanism of inactivation preliminarily. Results indicated that O3 had a stronger inactivating capability. When the concentration of O3 was above 3.0 mg/L and the contact time was up to 7 min, a significant inactivating effect could be achieved. The turbidity on inactivation effects was also found to be statistically significant in artificial water. With increases in turbidity, the inactivating effect decreased. Inactivation rate improved with a temperature increase from 5 to 25℃, but decreased beyond this. The inactivating capability of O3 was found to be stronger under acidic than that under alkalic conditions. When the concentration of organic matter in the reaction system was increased, the competition between Cryptosporidium and organics with O3 probably took place, thereby reducing the inactivation rate. In addition, the cellular morphology of Cryptosporidium varied with different contact times. At zero contact time, cells were rotundity and sphericity, at 60 sec they became folded, underwent emboly, and burst at 480 sec, the cell membrane of Cryptosporidium shrinked and collapsed completely.

关键词： ozone inactivation Cryptosporidium ultrastructures

Characterization of chlorine dioxide as disinfectant for the removal of low concentration microcystins

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2012年第1期6卷 75-81页

作者： Mingsong WU junli huang Yuling ZHANG Shijie YOU Shaofeng LI Zhilin RAN Yu TIAN Key Laboratory of Water Resource Utilization and Environmental Pollution Control Harbin Institute of TechnologyHarbin 150090China College of Environmental Science and Engineering North China Electric Power UniversityBaoding 071003China Department of Architecture Engineering Shenzhen Polytechnic InstituteShenzhen 518055China

Microcystins, which represents one kind of cancerogenic organic compounds, is abundant in eutro- phication water. The effects of reaction factors on chlorine dioxide （C102） for removal of low-concentration Micro- cystin-LR, Microcystin-RR, and Microcystin-YR in water as well as the reaction mechanisms was investigated by using enzyme-linked immunosorbent assay （ELISA） kit and gas chromatography-mass spectrometry （GC-MS）. The results showed that MC-LR, MC-RR, and MC-YR could be efficiently decomposed by C102. The degradation efficiency was shown positively correlated to the concen- tration of C102 and reaction time; while the effect of reaction temperature and pH is slight. The kinetic constants and activation energies of the reaction ofMC-LR, MC-RR, and MC-YR with C102 are determined as 459.89, 583.15, 488.43 L.（***）I and 64.78, 53.01, ***1, respectively. As indicated by high performance liquid chromatography mass spectrometer （HPLC-MS） analysis, degradation should be accomplished via destruction of Adda group by oxidation, with the formation of dihydroxy substituendums as end products. This study has provided a fundamental demonstration of C102 serving as oxidizing disinfectant to eliminate microcystins from raw water source.

关键词： disinfection chlorine dioxide microcystins reaction mechanism

OsNAC120 balances plant growth and drought tolerance by integrating GA and ABA signaling in rice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Communications 2024年第3期5卷 197-215页

作者： Zizhao Xie Liang Jin Ying Sun Chenghang Zhan Siqi Tang Tian Qin Nian Liu junli huang Key Laboratory of Biorheological Science and Technology of Ministry of Education Bioengineering College of Chongqing UniversityChongqingChina

The crosstalk between gibberellin(GA)and abscisic acid(ABA)signaling is crucial for balancing plant growth and adaption to environmental ***,the molecular mechanism of their mutual antagonism still remains to be fully *** this study,we found that knockout of the rice NAC(NAM,ATAF1/2,CUC2)tran-scription factor gene OsNAC120 inhibits plant growth but enhances drought tolerance,whereas OsNAC120 overexpression produces the opposite *** GA can rescue the semi-dwarf phenotype of osnac120 mutants,and further study showed that OsNAC120 promotes GA biosynthesis by transcriptionally activating the GA biosynthetic genes OsGA20ox1 and *** DELLA protein SLENDER RICE1(SLR1)interacts with OsNAC120 and impedes its transactivation ability,and GA treatment can remove the inhi-bition of transactivation activity caused by *** the other hand,OsNAC120 negatively regulates rice drought tolerance by repressing ABA-induced stomatal *** investigation revealed that OsNAC120 inhibits ABA biosynthesis via transcriptional repression of the ABA biosynthetic genes OsNCED3 and *** OSMOTIC STRESS/ABA-ACTIVATED PROTEIN KINASE 9(OsSAPK9)physically interacts with OsNAC120 and mediates its phosphorylation,which results in OsNAC120 *** treatment ac-celerates OsNAC120 degradation and reduces its transactivation ***,our findings provide evidence that OsNAC120 plays critical roles in balancing GA-mediated growth and ABA-induced drought tolerance in *** research will help us to understand the mechanisms underlying the trade-off between plant growth and stress tolerance and to engineer stress-resistant,high-yielding crops.

关键词： abscisic acid ABA drought stress gibberellin GA OsNAC120 OsSAPK9 rice Oryza sativa L. SLR1

Uptake of oxidative stress-mediated extracellular vesicles by vascular endothelial cells under low magnitude shear stress

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第3期7卷 397-410页

作者： Xian Qin Kun Zhang Juhui Qiu Nan Wang Kai Qu Yuliang Cui junli huang Li Luo Yuan Zhong Tian Tian Wei Wu Yi Wang Guixue Wang Key Laboratory for Biorheological Science and Technology of Ministry of Education State and Local Joint Engineering Laboratory for Vascular ImplantsBioengineering College of Chongqing UniversityChongqing400030China The Nanoscience Centre University of CambridgeCambridgeCB30FFUK

Extracellular vesicles(EVs)are increasingly used as delivery vehicles for drugs and bioactive molecules,which usually require intravascular *** endothelial cells covering the inner surface of blood vessels are susceptible to the shear stress of blood *** studies demonstrate the interplay of red blood cell-derived EVs(RBCEVs)and endothelial ***,the phagocytosis of EVs by vascular endothelial cells during blood flow needs to be *** this study,red blood cell-derived extracellular vesicles(RBCEVs)were constructed to investigate endothelial cell phagocytosis in vitro and animal *** showed that low magnitude shear stress including low shear stress(LSS)and oscillatory shear stress(OSS)could promote the uptake of RBCEVs by endothelial cells in *** addition,in zebrafish and mouse models,RBCEVs tend to be internalized by endothelial cells under LSS or ***,RBCEVs are easily engulfed by endothelial cells in atherosclerotic plaques exposed to LSS or *** terms of mechanism,oxidative stress induced by LSS is part of the reason for the increased uptake of endothelial ***,this study shows that vascular endothelial cells can easily engulf EVs in areas of low magnitude shear stress,which will provide a theoretical basis for the development and utilization of EVs-based nano-drug delivery systems in vivo.

关键词： Extracellular vesicles(EVs) Blood flow shear stress Endothelial cell uptake Nanoparticles Oxidative stress

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国外煤矿应急救援技术装备综述

煤矿安全 2016年第9期47卷 233-236页

作者：黄军利中国矿业大学安全工程学院江苏徐州221116

从大型技术装备、安全防护技术装备以及通讯技术装备3个方面系统地总结了当前国外煤矿应急救援技术装备,并提出切实加强煤矿突发事故预防技术设备的研发与应用,强化发展煤矿突发事故应急救援技术装备,细致完善煤矿事故应急救援技术与经... 详细信息

从大型技术装备、安全防护技术装备以及通讯技术装备3个方面系统地总结了当前国外煤矿应急救援技术装备,并提出切实加强煤矿突发事故预防技术设备的研发与应用,强化发展煤矿突发事故应急救援技术装备,细致完善煤矿事故应急救援技术与经验总结。

关键词：应急救援技术安全防护技术通讯技术应急救援装备突发事故

在线全文

学校读者我要写书评

暂无评论

二氧化氯发生技术的试验研究

环境化学 2000年第5期19卷 441-446页

作者：鲁秀国黄君礼哈尔滨建筑大学

本文进行了二氧化氯发生技术的实验研究,给出了适宜的反应条件,即NaClO_3浓度为25.9%,还原剂A浓度为2.65%,曝气量0.8L空气·min^-1,反应温度60℃,反应时间30min时,ClO_2的收率为82.1%,纯度大于95.0%

关键词：二氧化氯发生技术反应收率工艺消毒剂

初中学生英语阅读能力提升途径研究——以华南师范大学附属中学新世界学校为例

在线全文

学校读者我要写书评

暂无评论

英语教师 2019年第11期19卷 38-44页

作者：黄俊莉华南师范大学附属中学新世界学校

以华南师范大学附属中学新世界学校七、八、九年级的109 名学生为研究对象,采用问卷调查法了解学生的英语阅读现状,分析学生在英语阅读过程中的易发问题和障碍。研究发现,影响学生英语阅读能力的主要因素是词汇量、阅读技巧、语法知识... 详细信息

以华南师范大学附属中学新世界学校七、八、九年级的109 名学生为研究对象,采用问卷调查法了解学生的英语阅读现状,分析学生在英语阅读过程中的易发问题和障碍。研究发现,影响学生英语阅读能力的主要因素是词汇量、阅读技巧、语法知识。在此基础上,探究提升初中学生英语阅读能力的途径,提出培养学生良好的阅读习惯、加大故事类英语题材的课外阅读、提高阅读技巧等方法。

关键词：初中英语阅读能力阅读动机