检索结果-南通市图书馆

Enhanced photocatalytic hydrogen production from Co-MOF/cn by nitrogen and sulfur co-doped coal-based carbon quantum dots

引用

Journal of Rare Earths 2024年第5期42卷 838-850,I0002页

作者： Shiyong Xu Mei Li Yijun Wang Caiyun Gao Rongsheng Xu Zhiliang jin School of Chemistry and Chemical Engineering North Minzu UniversityYinchuan750021China Ningxia Key Laboratory of Solar Chemical Conversion Technology.North Minzu University.Yinchuan 750021China State Key Laboratory of National Ethnic Affairs Commission Chemical Technology.North Minzu University Yinchuan750021China

A novel composite photocatalyst for photocatalytic decomposition of water for hydrogen evolution was successfully synthesized by in-situ growth of nitrogen and sulfur co-doped coal-based carbon quantum dots(NSCQDs)nanoparticles on the surface of sheet cobalt-based metal-organic framework(Co-MOF)and graphitic carbon nitride(g-C_(3)N_(4),cn).The structure and properties of the obtained catalysts were systematically analyzed.NSCQDs effectively broaden the absorption of Co-MOF and cn in the visible region.The new composite photocatalyst has high hydrogen production activity and the hydrogen production rate reaches 6254μmol/(g·h)at pH=9.At the same time,NSCQDs synergy Co-MOF/cn composites have good stability.After four cycles of hydrogen production,the performance remains relatively stable.The tran sient photocurrent response and Nyquist plot experimental results further demonstrate the improvement of carrier separation efficiency in composite catalysts.The semiconductor type(n-type semico nductor)of the single-phase catalyst was determined by the Mott-Schottky test,and the band structure was analyzed.The conductive and valence bands of cn are-0.99 and 1.72 eV,respectively,and the conduction and valence bands of Co-MOF are-1.85 and 1.33 eV,respectively.Th e mechanism of the photocatalytic reaction can be inferred,that is,Z-type heterojunction is formed between cn an d Co-MOF,and NSCQDs was used as cocatalyst.

关键词： Nitrogen and sulfur co-doped Coal-based carbon quantum dots Co-MOF cn Photocatalytic hydrogen evolution Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Reactive Magnetron Sputtering of cn_x Thin Films on β-Si_3N_4 Substrates

引用

Journal of Materials Science & Technology 1998年第3期14卷 269-272页

作者： WT.Zheng N-Hellgren and J.-E.Sundgren( Dept. of Materials Science, Jilin Univer-sity Changchun 13oo23, China)(Dept. of Physics, Linkoping University, S-581 83 Linkoping, Sweden) Dept. of Physics Linköping University S-581 83 Linköping Sweden Dept. of Materials Science Jilin University Changchun 130023 China

Carbon nitride cn. thin films have been deposited on polycrystalline β-Si3N4 substrates by un-balanced magnetron sputtering in a nitrogen discharge. Both the film deposition rate and the nitrogen concentration decrease with substrate temperature increase in the range of 100~400℃The maximum of nitrogen content is 40 at. pct. Raman spectroscopy and atomic force mi-croscopy were used to characterize the bonding, microstructure and surface roughness of the films. Nanoindentation experiments exhibit a higher hardness of 70 GPa and an extremely elas-tic recovery of 85% at higher substrate temperature.

关键词： Thin Si3N4 Substrates Reactive Magnetron Sputtering of cn_x Thin Films on cn

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Theoretical study on the reaction mechanism of cn radical with ketene

引用

Science China Chemistry 2008年第2期51卷 101-110页

作者： ZHAO LiWei KAN Wei YU HaiTao FU HongGang SUN JiaZhong School of Chemistry and Materials Science Heilongjiang UniversityHarbin 150080China State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical ChemistryJilin UniversityChangchun 130023China School of Chemistry and Chemical Engineering Qiqihar UniversityQiqihar 161006China

The bimolecular single collision reaction potential energy surface of cn radical with ketene (CH2CO) was investigated by means of B3LYP and QCISD(T) methods. The calculated results indicate that there are three possible channels in the reaction. The first is an attack reaction by the carbon atom of cn at the carbon atom of the methylene of CH2CO to form the intermediate NCCH2CO followed by a rupture reaction of the C-C bond combined with -CO group to the products CH2cn+CO. The second is a direct addition reaction between cn and CH2CO to form the intermediate CH2C(O)cn followed by its isomerization into NCCH2CO via a cn-shift reaction, and subsequently, NCCH2CO dissociates into CH2cn+CO through a CO-loss reaction. The last is a direct hydrogen abstraction reaction of CH2CO by cn radical. Because of the existence of a 15.44 kJ/mol reaction barrier and higher energy of reaction products, the path can be ruled out as an important channel in the reaction kinetics. The present theoretical computation results, which give an available suggestion on the reaction mechanism, are in good agreement with previous experimental studies.

关键词： ketene cn radical theoretical computation reaction mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of Temperature Variation on Performance of Carbon Nanotube Field-Effect Transistor-Based on Chaotic Oscillator:A Quantum Simulation Study

引用

Chinese Physics Letters 2015年第3期32卷 141-144页

作者： Van Ha Nguyen Hanjung Song Department of Nanoscience and Engineering Center for Nano ManufacturingInje University

We evaluate the impact of temperature on the output behavior of a carbon nanotube field effect transistor （cnFET） based chaotic generator. The sources cause the variations in both current-voltage characteristics of the cnFET device and an overall chaotic circuit is pointed out. To verify the effect of temperature variation on the output dynamics of the chaotic circuit, a simulation is performed by employing the cnFET compact model of Wong et al. in HSPICE with a temperature range from -100℃ to 100℃. The obtained results with time series, frequency spectra, and bifurcation diagram from the simulation demonstrate that temperature plays a significant role in the output dynamics of the cnFET-based chaotic circuit. Thus, temperature-related issues should be taken into account while designing a high-quality chaotic generator with high stability.

关键词： cn Impact of Temperature Variation on Performance of Carbon Nanotube Field-Effect Transistor-Based on Chaotic Oscillator:A Quantum Simulation Study HSPICE MOSFET

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Expression of putative zinc-finger protein lcn61 gene in lymphocystis disease virus China (LCDV-cn) genome

引用

Chinese Journal of Oceanology and Limnology 2009年第2期27卷 337-341页

作者：闫秀英孙修勤 College of Llife Science and Technology Ocean University of China First Institute of Oceanography SOA

An open reading frame (lcn61) of lymphocystis disease virus China (LCDV-cn), probably responsible for encoding putative zinc-finger proteins was amplified and inserted into pET24a (+) vector. Then it expressed in E. coli BL21 (DE3), and His-tag fusion protein of high yield was obtained. It was found that the fusion protein existed in E. coli mainly as inclusion bodies. The bioinformatics analysis indicates that Lcn61 is C2H2 type zinc-finger protein containing four C2H2 zinc-finger motifs. This work provides a theory for functional research of lcn61 gene.

关键词：淋巴囊肿病毒锌指蛋白基因组中国 cn 大肠杆菌融合蛋白开放阅读框

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of the SCS-cn Model to Runoff Estimation in a Small Watershed with High Spatial Heterogeneity

引用

Pedosphere 2011年第6期21卷 738-749页

作者： XIAO Bo WANG Qing-Hai FAN Jun HAN Feng-Peng DAI Quan-Hou Beijing Research ＆ Development Center for Grass and Environment Beijing Academy of Agriculture and Forestry Sciences Beijing 100097 （China） State Key Laboratory of Soil Erosion and Dryland Farmning on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences Yangling 712100 （China） Colleqe of Forest Guizhou University Guiyang 550025 （China）

For reasons of simplicity, the most commonly used hydrological models are based on the Soil Conservation Service Curve Number (SCS-cn) model, which is probably a good choice for the estimation of runoff on the Loess Plateau of China; however, the high spatial heterogeneity, mainly caused by a fragmented landform and variations in soil type, may limit its applicability to this region. Therefore, applicability of the SCS-cn model to a small watershed, Liudaogou on the plateau, was evaluated and the most appropriate initial abstraction ratio (Ia/S) value in the model was quantified by the inverse method. The results showed that the standard SCS-cn model was applicable to the estimation of runoff in the Liudaogou watershed and the model performance was acceptable according to the values of relative error and Nash-Sutcliffe effciency. The most appropriate Ia/S value for the watershed was 0.22 because with this modified Ia/S value, the model performance was slightly improved. The model performance was not sensitive to the modification of the Ia/S value when one heavy rainfall event (50.1 mm) was not considered, which implied that the model, using a standard Ia/S value, can be recommended for the Liudaogou watershed because single rainfall events exceeding 50 mm seldom occurred in that region. The runoff amount predicted for the Liudaogou watershed by the SCS-cn model, using the modified Ia/S value, increased gradually with increasing rainfall when rainfall values were lower than 50 mm, whereas the predicted amount increased rapidly when the rainfall exceeded 50 mm. These findings may be helpful in solving the problem of serious soil and water loss on the Loess Plateau of China.

关键词：小流域径流空间异质性水文模型 SCS cn 中国黄土高原六道沟流域性能估计

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Scandium terminal imido complex induced intramolecular C-N bond cleavage and transformation

引用

Science China Chemistry 2014年第8期57卷 1098-1105页

作者： CHU JiaXiang ZHOU QingHai LI YuXue LENG XueBing CHEN YaoFeng State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

The scandium terminal imido complex supported by a monoanionic tetradentate NNNN ligand, [LSc=N(DIPP)](L = [MeC(N(DIPP))CHC(Me)(NCH2CH2N(Me)CH2CH2NMe2]-, DIPP = 2,6-(iPr)2C6H3)(1), undergoes a C–N bond cleavage at elevated temperature to give a mononuclear scandium anilido intermediate 2a, which subsequently aggregates into a binuclear scandium anilido complex 2. The mononuclear intermediate 2a reacts with alkyne or imine to provide two scandium anilido complexes 3 and 4, which contain a dianionic tetradentate NNNC ligand or a dianionic tetradentate NNNN ligand. DFT calculations on the reaction mechanism of C–N bond cleavage in 1 were also performed.

关键词：酰亚胺键断裂 cn 终端分子内复合物钪诱导

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluation of 1-Chloroacetophenone (cn) and Dibenz (b, f)-1, 4 oxazepine (CR) Induced Respiratory Tract Sensory Irritation Following a Simple Inhalation Exposure Method in Mice

引用

Biomedical and Environmental Sciences 1998年第2期11卷 171-178页

作者： PRAVIN KUMAR AND A. S. SACHAN(Division of Pharmacology and Toxicology, Defence Research and Development Establishment, Jhansi Road,Gwalior-474002, India)(To whom all correspondence should be addressed.) Division of Pharmacology and Toxicology Defence Research and Development Establishment Jhansi Road Gwalior-474002 India

Sensory irritation of the upper respiratory tract was induced in mice by inhalation of vapors, generated under thermal stress of two tear gases viz. 1-chloroacetophenone (cn) and dibenz (b, f)-1, 4 oxazepine (CR) following a simple exposure technique. A known quantity of the irritant was kept in an adapter fitted with glass exposure chamber, heated, and the vapor thus generated was purged into the chamber. The restrained mouse inhaled the vapor, and the resultant depression of respiratory rate was recorded on a polygraph. Fifty percent depression of the respiration rate and the corresponding air concentration of the irritant was determined by obtaining the linear curve fitting equation and putting the value of Y=50. It was concluded that inhalation of CR vapor was 2. 66 times more irritating than that of cn in mice. The employed exposure method also proved to be simple, sensitive, easy t0 operate,and may also prove useful in evaluating irritation of upper respiratory tract fOllowing the inhalation of vapors of various chemicals.

关键词： Evaluation of 1-Chloroacetophenone and Dibenz cn CR

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Altered Host Resistance to Listeria monocytogenes In Mice Exposed to 1-Chloroacetophenone (cn) Vapours

引用

Biomedical and Environmental Sciences 1992年第2期5卷 142-148页

作者： PRADEEP KUMAR PRAVIN KUMAR K.ZACHARIAH G.P.RAI R.VIJAYRAGHAVAN Defence Research and Development Establishment Tansen RoadDefence Research and Development Establishment Tansen RoadDefence Research and Development Establishment Tansen RoadDefence Research and Development Establishment Tansen RoadDefence Research and Development Establishment Tansen Road Gwalior 474002 India Gwalior 474002 India Gwalior 474002 IndiaGwalior 474002 IndiaGwalior 474002 India

Short term repeated exposure of 1-chloroacetophenone (cn) vapours at a concentration of 0.153 mg per litre for 15 minutes daily on 10 consecuitve days in Swiss albino male mice resulted in increased mortality to Listeria monocytogenes. Significantly elevated bacterial growth was observed in the spleen and liver of the cn exposed animals. The increased bacterial count in these organs was evident within 4-6 days post challenge as compared to vehicle exposed infected and unexposed infected animals. Increased susceptibility to infection has been considered to be the function of immune alteration due to cumulative short term effects ofcn vapour inhalation. This may be attributed to immunotoxic effects of cn on Tcells mediated macrophage functions.

关键词： cn Vapours Altered Host Resistance to Listeria monocytogenes In Mice Exposed to 1-Chloroacetophenone

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Hole Transport Characteristics of 1,4,5,8,9 and 11-Hexaazatriphenylene-Hexacarbonitrile by Blending

引用

Chinese Physics Letters 2016年第2期33卷 106-110页

作者：王艳平黄金英陈江山乔现锋杨德志马东阁董丽松 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of Sciences

The hole transport characteristics of molecule blends of 1, 4, 5, 8, 9 and 11-hexaazatriphenylene-hexacarbonitrile （HAT-cn）： N,N＇-di（naphthalene-l-yl）-N,N＇-diphenyl-benzidine （NPB） and HAT-cn： 4,4＇-cyclohexylidenebis[N,N- bis（4-methylphenyl）benzenamine] （TAPC） with various NPB and TAPC mixing concentrations （5 90wt%） are studied. When the concentration is in the range of 5-80wt%, it is found that the hole conductions in the two blends are space-charge-limited current （SCLC） with free trap distributions. The current-voltage characteristics of the two blends show SCLC with exponentiM trap distributions at the concentration of 90wt%. The hole mo- bilities of the two blends are very close （10^-4-10^-3 cm2 V^-1 s-X ）, the dependence of electric field and temperature can be described by the modified Poole-Frenkel model. The hole mobility and activation energy of the two blends depending on concentration are similar.

关键词： NPB is cn of The Hole Transport Characteristics of 1,4,5,8,9 and 11-Hexaazatriphenylene-Hexacarbonitrile by Blending in by

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：