检索结果-南通市图书馆

Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications

Nano Research 2019年第5期12卷 1041-1047页

作者： Md Tanvir Hasan Roberto Gonzalez-Rodriguez Conor Ryan Kristof Pota Kayla Green Jeffery L.Coffer anton v.naumov Department of Physics and Astronomy Texas Christian UniversityTCU Box 298840Fort WorthTexas 76129USA Department cf Chemistry and Eiochemistry Texas Christian UniversityTCU Box 298860Fort WorthTexas 76129USA

In this work,we utilize a bottom-up approach to synthesize nitrogen self-doped graphene quantum dots (NGQDs) from a single glucosamine precursor via an eco-friendly microwave-assisted hydrothermal *** and optical properties of as-produced NGQDs are further modified using controlled ozone ***-treated NGQDs (Oz-NGQDs) are reduced in size to 5.5 nm with clear changes in the lattice structure and/D//G Raman ratios due to the introduction/alteration of oxygen-containing functional groups detected by Fourier-transform infrared (FTIR) spectrometer and further verified by energy dispersive X-ray spectroscopy (EDX) showing increased atomic/weight percentage of oxygen *** with structural modifications,GQDs experience decrease in ultraviolet-visible (Uv-vis) absorption coupled with progressive enhancement of visible (up to 16 min treatment) and near-infrared (NIR)(up to 45 min treatment) *** allows fine-tuning optical properties of NGQDs for solar cell applications yielding controlled emission increase,while controlled emission quenching was achieved by either blue laser or thermal *** Oz-NGQDs were further used to form a photoactive layer of solar calls with a maximum efficiency of 2.64% providing a 6-fold enhancement over untreated NGQD devices and a 3-fold increase in fill factor/current *** study suggests simple routes to alter and optimize optical properties of scalably produced NGQDs to boost the photovoltaic performance of solar cells.

关键词： nitrogen-doped graphene quantum dots ozone treatment optical properties photovoltaics solar cells

来源：

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

俄罗斯Kurile-Kamchatka地区安山质熔体的成分、挥发分组成和微量元素

引用

岩石学报 2007年第1期23卷 93-104页

作者： M.L.Tolstykh v.B.naumov A.D.Babansky vernadsky Institute of Geochemistry and Analytical Chemistry Russian Academy of Sciencesul.Kosygina 19Moscow119991 Russia Institute of Geology of Ore Deposits PetrographyMineralogyand GeochemistryRussian Academy of SciencesStaromonetnyi per.35Moscow119017Russia

Melt inclusions in minerals from some volcanoes of the Kurile-Kamchatka region were *** studied basaltic andesites and andesites were sampled from volcanoes of the Central Kamchatka depression(Shiveluch and Bezymyannyi),Eastern Kamchatka volcanic belt(Avachinskii and Karymskii),and Iturup Island,Southern Kuriles(Kudryavyi).Basalts of the 1996 eruption of the Karymskii volcanic center and dacites of Dikii Greben'volcano,Southern Kamchatka were also *** than 260 melt inclusions from 31 rock samples were homogenized,and quenched glasses were analyzed using electron and ion *** compositions of melt inclusions in andesitic phenoerysts vary in silica contents from 56 to 80wt%.Al_2 O_3 ,FeO,MgO,CaO decrease and Na_2O and K_2O increase with increasing SiO_*** inclusions(about 80% )are dacitic or ***,the compositions of silicic glasses(>65wt% SiO_2)in andesites significantly differ in TiO2,FeO,MgO,CaO,and K_2O contents from those in dacites and ***-potassium melts(K_2O 3.8～6.8wt% )with various SiO_2 from 51.4 to 77.2wt% were found in minerals of all volcanoes *** indicates a contribution of a component selectively enriched in potassium to magmas of the whole region.A great compositional diversity of melt inclusions in plagioelase phenocrysts from the Bezymyannyi andesites suggests a complex history of plagioclase crystallization and magma evolution in the andesite *** from different volcanoes strongly vary in volatile *** highest H_2O contents are found in the melts from Shiveluch(3.0～7.2wt%,4.7wt% on average)and Avachinskii (4.7～4.8wt%);while those are lower in melts of Kudryavyi(0.1～2.6wt% ),Dikii Greben'(0.4～1.8wt%),and Bezymyannyi (values are found in the Bezymyannyi melts(0.09wt% on average),the highest Cl contents are typical of melt inclusions in minerals from the Karymskii andesites(0.26wt% on average).The melts from Avachinski

关键词：俄罗斯Kurile-Kamchatka地区安山质熔体成分挥发分组成微量元素

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

Flow models of business processes

Flow models of business processes

引用

作者： A.A.naumov v.v.Shabunko Novosibirsk State Technical University(NSTU) 630092 NovosibirskK.Marks20Russia

The portfolio of business processes is an integrated system that consists of business-processes with different *** research of unconditioned business processes has been carrying *** term"unconditioned"means that portfolio being formed and researched consists of business processes related to insurance,crediting,publishing,science and other kinds of *** that way portfolio of business processes can be formed on the basis of a set of business processes with different nature.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

过去三十年人间鼠疫在世界的分布

引用

地方病译丛 1990年第6期11卷 11-15页

作者： A.K.Akiev A.v.naumov 侯培森

本文回顾了过去三十年(1959年-1988年)人间鼠疫在世界各地的分布情况,并对最近十年人间鼠疫的流行病学特征进行了讨论.

关键词：鼠疫世界

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

苏联的鼠疫自然疫源地

引用

地方病译丛 1990年第6期11卷 65-67页

作者： Akiev A.K. naumov A.v. 侯培森

众所周知,早在1899年苏联科学家Zabolotny D.K.氏就提出在人类鼠疫病例的发生中,野鼠可能起作用的看法.然而,在鼠疫病人和人间鼠疫暴发流行经常发生的地区工作的许多专业考察队,却很长时间没有注意他的这一假设.直到1911年,在对外贝加... 详细信息

众所周知,早在1899年苏联科学家Zabolotny D.K.氏就提出在人类鼠疫病例的发生中,野鼠可能起作用的看法.然而,在鼠疫病人和人间鼠疫暴发流行经常发生的地区工作的许多专业考察队,却很长时间没有注意他的这一假设.直到1911年,在对外贝加尔湖沙拉松火车站附近捕捉的一只蒙古旱獭进行实验室检查,分离出鼠疫菌时,

关键词：鼠疫苏联疫源

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

Novel Approach to the Design of Optoelectronic Heterostructures Based on Indium and Copper Sulfides

引用

复旦学报（自然科学版） 2007年第5期46卷 730-页

作者： A.Zavrazhnov A.naumov A.Sergeeva v.Semenov v.Pervov voronezh State University Institute of General and Inorganic Chemistry

1 Results Heterostructures,based on ternary CuInS(Se2) chalcogenides and related binary compounds (Cu2-xCh,CuCh,In2Ch3 and InCh; Ch=S,Se) are considered appear to be a matter of choice for producing promising optoelectronic *** the present work we propose and consider a very simple way for the formation of sulfide and selenide *** main idea is assumes a novel two-stage method of synthesis and nonstoichiometry control for heterostructures of InxS(Se)1-x/Si,CuInS(Se)2/Si and InxS1-...

关键词： heterostructures copper-indium sulfides nonstoichiometry CvT

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

Non-Thermal Plasma Assisted Reforming of Ethanol in Dynamic Plasma-Liquid Systems

引用

Journal of Energy and Power Engineering 2011年第5期5卷 403-410页

作者： v. Chemyak S. Olszewskii O. Nedybalyuk S. Sydoruk v. Yukhymenko I. Prysiazhnevych E. Martysh A. Shchedrin D. Levko v. naumov v. Demchina v. Kudryavzev Faculty of Radiophysics Taras Shevchenko Kyiv National University Kyiv 03022 Ukraine Institute of Physics National Academy of Sciences of Ukraine Kyiv 03028 Ukraine Institute of Gas National Academy of Sciences of Ukraine Kyiv 03113 Ukraine

The paper presents experimental and theoretical studies of non-thermal plasma assisted reforming of liquid ethanol into hydrogen-rich syngas in dynamic plasma-liquid systems （PLS） using electric DC and pulsed discharges in a gas channel with liquid wall （DGCLW） and DC discharge in a reverse vortex gas flow of Tornado type with ＂liquid＂ electrode （TORNADO-LE）. Results of experiments show the energy efficiency of plasma-chemical conversion of ethanol in studied systems. Results of model calculations explain the kinetic mechanism of non-equilibrium plasma-chemical transformations in different conditions. The proposed technique of plasma-fuel reforming can be used in alternative biofuels combustion technologies in advanced diesel engines and power plants.

关键词： Energy conversion hydrogen ethanol electric discharge plasma fuel reforming.

来源：

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

RESULTS OF INvESTIGATIONS OF ICEBERGS, GLACIERS AND THEIR FRONTAL ZONES IN THE NORTHEASTERN PART OF THE BARENTS SEA

RESULTS OF INVESTIGATIONS OF ICEBERGS, GLACIERS AND THEIR FR...

引用

第19届极区港口与海洋工程国际会议

作者： G.K. Zubakin Yu.P. Gudoshnikov A.K. naumov A.F. Glazovsky N.v. Kubyshkin I.v. Buzin v.v. Borodulin E.A. Skutina State Institution 《Arctic and Antarctic Research Institute》 St.Petersburg Russia Institute of Geography of Russia Academy of Science Moscow Russia State Hydrological Institute St.Petersburg Russia

The State Institution 《Arctic and Antarctic Research Institute》 (SI 《AARI》, St. Petersburg) conducted a number of marine ice research expeditions in 2001006 in the framework of engineering surveys in the region Shtockman Gas-Condensate Field (ShGCF) in the northeastern part of the Barents Sea. One of the main objects of investigations were icebergs being very hazardous for marine hydro-technical structures, and particularly for drilling platforms that, it is expected, will be installed in the nearest future in the region of the SGCF and other oil-and-gas structures in the Barents Sea. Information about calving glaciers is essential for reliable forecast of icebergs discharge into the SGCF area. Due to this, special attention was paid to the investigation of outlet glaciers situated in the Northeastern Barents Sea.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Selective sorptive removal of Methyl Red from individual and binary component solutions by mesoporous organosilicas of MCM-41 type

引用

Journal of Environmental Sciences 2021年第1期33卷 59-71页

作者： Nadiia v.Roik Lyudmila A.Belyakova Marina O.Dziazko Chuiko Institute of Surface Chemistry of NAS of Ukraine 17 General Naumov Str.Kyiv 03164Ukraine

Organosilicas with chemically immobilized 3-aminopropyl and Methyl Red-containing surface groups were prepared by sol-gel condensation of tetraethyl orthosilicate and(3-aminopropyl)triethoxysilane in the presence of dye as part of the mixed micelles or dyecontaining silane as silica *** hexagonally arranged mesoporous structure of synthesized materials was confirmed by low-temperature nitrogen adsorption-desorption,xray diffraction,and TEM *** composition of MCM-41-type organosilicas was established by FT-IR spectroscopy and chemical analysis of surface *** of Methyl Red by organosilicas was studied from diluted phosphate buffer solutions in dependence of medium p H,duration of contact,and equilibrium concentration of *** was found that effective removal of Methyl Red takes place at p H values within a range of *** curves of Methyl Red sorption on organosilicas were analyzed by the Lagergren,Ho-McKey,and Weber-Morris kinetic *** was found that the pseudo-second-order model fits the kinetics of Methyl Red sorption on all synthesized materials and the intraparticle diffusion is not the only one mechanism controlling the rate of Methyl Red sorptive *** parameters of equilibrium sorption of Methyl Red on organosilicas of MCM-41 type were calculated using Langmuir,Freundlich,Redlich-Peterson,and Brunauer-Emmett-Teller *** of acid dyes with geometry similar or substantially different from Methyl Red on mesoporous silicas was studied from single and binary component mixtures in aqueous solutions with p H 4.8 and *** was found that selective sorption process is highly dependent on the structural characteristics and protolytic state of silica surface as well as acid dye.

关键词： MCM-41 Sol-gel synthesis Methyl Red Chemical modification Selective sorption

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

用活性炭及部分热解碳材料进行的质子催化(英文)

引用

催化学报 2014年第6期35卷 815-823页

作者： v.v.Strelko S.S.Stavitskaya Yu.I.Gorlov Institute for Sorption and Problems of Endoecology of NAS of Ukraine 13 General Naumov St.03164 Kyiv Ukraine

The development of environmentally friendly solid acid catalysts is a priority task. Highly oxidized activated carbon and their ion-substituted (saline) forms are effective proton transfer catalysts in esterification, hydrolysis, and dehydration, and thus are promising candidates as solid acid cata-lysts. Computations by the ab initio method indicated the cause for the enchanced acidity of the carboxylic groups attached to the surface of highly oxidized carbon. The synthesis of phosphorilated carbon was considered, and the proton transfer reactions catalyzed by them in recent studies were analyzed. The development of an amorphous carbon acid catalyst comprising polycyclic carbonaceous (graphene) sheets with –SO3H, –COOH and phenolic type OH-groups was carried out. These new catalysts were synthesized by partial pyrolysis and subsequent sulfonation of carbohydrates, polymers, and other organic compounds. Their high catalytic activities in proton transfere reactions including the processing of bio-based raw materials was demonsrated.

关键词：固体酸催化剂质子转移反应碳材料活性炭热解从头计算方法羧酸基团碳水化合物

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：