检索结果-南通市图书馆

Gain deeper insights into traditional Chinese medicines using multidimensional chromatography co.bined with chemometric approaches

引用

Chinese Herbal Medicines 2024年第1期16卷 27-41页

作者： Xinyue Yang Pingping Zeng Jin Wen Chuanlin Wang Liangyuan Yao Min He Department of Pharmaceutical Engineering School of Chemical EngineeringXiangtan UniversityXiangtan 411105China Hunan Qianjin Xiangjiang Pharmaceutical Joint Stock co. Ltd.Zhuzhou 412000China

Traditional Chinese medicines(TCMs)possess a rich historical background,unique theoretical framework,remarkable therapeutic efficacy,and abundant ***,the modernization and internationalization of TCMs have faced significant obstacles due to their diverse ingredients and unknown *** gain deeper insights into the phytochemicals and ensure the quality co.trol of TCMs,there is an urgent need to enhance analytical ***,two-dimensional(2D)chromatography,which inco.porates two independent separation mechanisms,demonstrates superior separation capabilities co.pared to the traditional one-dimensional(1D)separation system when analyzing TCMs *** the past decade,new techniques have been co.tinuously developed to gain actionable insights from co.plex *** review presents the recent advancements in the application of multidimensional chromatography for the quality evaluation of TCMs,enco.passing 2D-gas chromatography(GC),2D-liquid chromatography(LC),as well as emerging three-dimensional(3D)-GC,3D-LC,and their associated data-processing *** studies highlight the promising potential of multidimensional chromatographic separation for future phytochemical ***,the increased separation capability has resulted in higher-order data sets and greater demands for data-processing *** that multidimensional chromatography is still a relatively nascent research field,further hardware enhancements and the implementation of chemometric methods are necessary to foster its robust development.

关键词： chemometrics multidimensional separation off-line two-dimensional liquid chromatography on-line two-dimensional liquid chromatography quality co.trol traditional chinese medicines two-dimensional gas chromatography

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

Surface engineering of Li-and Mn-rich layered oxides for superior Li-ion battery

引用

Tungsten 2024年第1期6卷 259-268页

作者： Lu-Xiang Ma Tian-Dong Chen Chun-Xi Hai Sheng-De Dong Xin He Qi Xu Hang Feng AXin Ji-Tao Chen Yuan Zhou co.lege of Materials and Chemistry and chemical Engineering Chengdu University of TechnologyChendu 610000China Qinghai Building and Materials Research co. LtdXining 810000China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The Li-and Mn-rich layered oxides(R-LNCM)are co.sidered as promising cathode materials for high-energy density lithium-ion batteries(LIBs).However,the interface side reaction aggravates the voltage and capacity fading between cathode material and electrolyte at high voltage,which severely hinders the practical application of LIB ***,lithium polyacrylate(LiPAA)as the binder and co.ting agent is applied to suppress the voltage and capacity fading of R-LNCM *** flexible LiPAA layers with high elasticity are capable of impeding cathode cracks on the particle surface via mechanical stress ***,superior voltage and capacity fading suppression on R-LNCM electrode is finally *** a result,LiPAA-R-LNCM cathode exhibits a remarkable specific capacity of 186 mA·h·g^(-1)with~73%retention at 1℃after ***,the co.responding average discharge potential is maintained to~3.1 V with only~0.4 V falling.

关键词： LiPAA interphase layer Interface side reaction Cathode cracks Capacity and voltage fading suppression Liand Mn-rich cathode

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

Studying the variable energy band structure for energy storage materials in charge/discharge process

引用

Chinese chemical Letters 2024年第2期35卷 584-589页

作者： Xuancheng Chen Yu Huan Ningqiang Sun Yuanhui Su Xuesong Shen Guoqing Li Jiaqi Zhang Tao Wei University of Jinan Ji'nan 250022China Weichai Power co. Ltd.Weifang 261061China

So far,a clear understanding about the relationship of variable energy band structure with the co.responding charge-discharge process of energy storage materials is still ***,using optical spectrosco.y(red-green-blue(RGB)value,reflectivity,transmittance,UV-vis,XPS,UPS)to studyα-co.OH)_(2) electrode working in KOH electrolyte as the research object,we provide direct experimental evidence that:(1)The intercalation of OH-ions will reduce the valence/co.duction band(VB and CB)and band gap energy(Eg)values;(2)The deintercalation of OH-ions co.responds with the reversion of VB,CB and E_(g) to the initial values;(3)The co.or of co.OH)_(2) electrode also exhibit regular variations in RGB value during the charge-discharge process.

关键词： Variable energy band structure Energy storage materials Charge-discharge process Optical spectrosco.y Supercapacitors

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

Reversible aqueous aluminum metal batteries enabled by a water-in-salt electrolyte

引用

Green Energy & Environment 2024年第7期9卷 1183-1191页

作者： Wenjing Tang Lijun Deng Longyuan Guo Shoubin Zhou Qinhai Jiang Jiayan Luo Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming State School of Materials Science and Engineering Shanghai Jiao Tong University School of Science Harbin Institute of Technology Key Laboratory for Green chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University HuaFu High Technology Energy Storage co. LTD Shanghai Jiao Tong University Shaoxing Research Institute of Renewable Energy and Molecular Engineering

Aluminum（Al）, the most abundant metallic element on the earth crust, has been reckoned as a promising battery material for its the highest theoretical volume capacity(8046 mAh cm-3). Being rechargeable in ionic liquid electrolytes, however, the Al anode and battery case suffer from co.rosion. On the other hand, Al is irreversible in aqueous electrolyte with severe hydrogen evolution reaction. Here, we demonstrate a water-in-salt aluminum ion electrolyte（WISE） based on Al and lithium salts to tackle the above challenges. In the WISE system, water molecules can be co.fined within the Li+solvation structures. This diminished Al3+-H2O interaction essentially eliminates the hydrolysis effect, effectively protecting Al anode from co.rosion. Therefore, long-term Al plating/stripping can be realized. Furthermore, two types of high-performance full batteries have been demonstrated using co.per hexacyanoferrate（CuHCF, a Prussian Blue Analogues） and LiNi0.8co..1Mn0.1O2（NCM） as cathodes. The reversibility of Al anode laid the foundation for low co.t rechargeable batteries suffering for large-scale energy *** co.text: Al batteries are expected to beco.e a safe and sustainable alternative to lithium batteries. For decades, chase for a feasible Al seco.dary battery has not been successful. The key challenge is to find suitable cathode and electrolyte materials, together with which Al anode battery can function reversibly. Currently, fatal drawbacks have impeded the practical application of Al metal batteries（AMBs）, such as sustained co.rosion of Al anode and battery case in ionic liquid electrolytes, irreversibility issues as well as severe hydrogen evolution reaction during cycling in aqueous electrolyte. Therefore, electrolyte and their electrochemical kinetics play a vital role in the performance and environmental operating limitations of high-energy Al metal batteries. In this work, we demonstrate a nearly neutral Al ion water-in-salt electrolyte（WISE） to tackle th

关键词： Water-in-salt electrolyte Rechargeable aluminum anode Solvation sheath Hybrid battery Abundance

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

F127 assisted fabrication of Ge/r GO/CNTs nanoco.posites with three-dimensional network structure for efficient lithium storage

引用

Chinese chemical Letters 2024年第9期35卷 447-451页

作者： Hui Gu Mingyue Gao Kuan Shen Tianli Zhang Junhao Zhang Xiangjun Zheng Xingmei Guo Yuanjun Liu Fu Cao Hongxing Gu Qinghong Kong Shenglin Xiong School of Environmental and chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Key Laboratory of the co.loid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJi’nan 250100China Jiangsu Hengshen co. Ltd.Zhenjiang 212314China School of the Environment and Safety engineering Jiangsu UniversityZhenjiang 212013China

To solve the volume expansion and poor electrical co.ductivity of germanium-based anode materials,Ge/rGO/CNTs nanoco.posites with three-dimensional network structure are fabricated through the dispersion of polyethylene-polypropylene glyco.(F127)and reduction of *** interesting phenomenon is disco.ered that F127 can break GeO_(2)polycrystalline microparticles into 100 nm nanoparticles by only physical interaction,which promotes the uniform dispersion of GeO_(2)in a carbon network structure co.posed of graphene(rGO)and carbon nanotubes(CNTs).As evaluated as anode material of Lithium-ion batteries,Ge/rGO/CNTs nanoco.posites exhibit excellent lithium storage *** initial specific capacity is high to 1549.7 mAh/g at 0.2 A/g,and the reversible capacity still retains972.4 mAh/g after 100 *** improved lithium storage performance is attributed to that Ge nanoparticles can effectively slow down the volume expansion during charge and discharge processes,and threedimensional carbon networks can improve electrical co.ductivity and accelerate lithium-ion transfer of anode materials.

关键词： F127 assisted fabrication Ge/rGO/CNTs nanoco.posites Three-dimensional carbon network Lithium-ion batteries Cycle stability

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

Preparation and characterization of high-reactivity explosive-based nano-boron microspheres

引用

Particuology 2024年第10期93卷 125-136页

作者： Chen Dong Yi Wang Kanghui Jia Dan Song Xiaolan Song Chongwei An School of Materials Science and Engineering North University of ChinaTaiyuan030051China Jinxi Group Shanxi Jiangyang chemical co. Ltd.Taiyuan030051China China Ordnance Institute of Science and Technology Beijing100089China School of Environment and Safety Engineering North University of ChinaTaiyuan030051China

Boron nanoparticles,with their remarkably high gravimetric and volumetric calorific values,emerge as the most promising fuel in energetic ***,challenges such as susceptibility to oxidation,high ignition temperature,and low co.bustion efficiency have co.strained their further *** this study,we fabricated high explosives based nano-boron microspheres with uniform size using the electrostatic spray method,in which the boron nanoparticles and high explosives(CL-20 or PETN)are closely bonded together by fluorinated polymer(F2602)and evenly *** results indicated that the microspheres exhibited high sphericity and showed an enhanced antioxidant *** addition of high-energy explosives not only reduced the thermal oxidation temperature of nano-boron powder within the microspheres but also significantly enhanced the pressurization ***,the microspheres with added high-energy explosives released more energy during the co.bustion *** to physically mixed samples,electrostatically sprayed microspheres with a uniform microstructure still exhibited higher ***,the design and synthesis of microspheres with co.trollable structures using the electrostatic spray method show promising application prospects.

关键词： Nano-boron CL-20 PETN Electrospraying Ignition and co.bustion

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

A novel route to enhance high-temperature mechanical property and thermal shock resistance of low-carbon Mgo-C bricks by introducing ZrSiO_(4)

引用

Journal of Iron and Steel Research International 2024年第6期31卷 1436-1448页

作者： Chun-hui Sun Ling-ling Zhu Hao Yan Wei Zhao Jing-xuan Liu Lin Ren Xian-tang Zhao Xiao-song Tong Shu-wen Yu Beijing Lirr High-Temperature Materials co. Ltd.Beijing 102211China School of Materials Science and Engineering Henan Province Industrial Technology Research Institute of Resources and MaterialsZhengzhou UniversityZhengzhou 450001HenanChina School of Chemistry and chemical Engineering Suzhou UniversitySuzhou 234000AnhuiChina

co.ventional MgO-C bricks(graphite co.tent>14 wt.%)produce a great deal of greenhouse gas emission,while low-carbon MgO-C bricks have serious thermal shock resistance during high-temperature *** enhance the high-temperature mechanical property and thermal shock resistance of low-carbon MgO-C bricks,a novel route of introducing ZrSiO_(4) powder into low-carbon MgO-C bricks was reported in such refractories with 2 wt.% flaky *** results indicate that the low-carbon MgO-C brick with 0.5 wt.%ZrSiO_(4) addition has the maximum hot modulus of rupture at 1400℃ and the co.responding specimen fired in the carbon embedded atmosphere has the maximum residual strength ratio(98.6%)after three thermal shock *** is found that some needle-like AlON and plate-like Al_(2)O_(3)-ZrO_(2) co.posites were in situ formed in the matrices after the low-carbon MgO-C bricks were co.ed at 1400℃,which can enhance the high-temperature mechanical property and thermal shock resistance due to the effect of fiber toughening and particle ***,co.(2) emission of the newly developed low-carbon MgO-C bricks is reduced by 58.3% per ton steel after using them as the working lining of a 90 t vacuum oxygen decarburization ladle.

关键词： Low-carbon MgO-C brick ZrsiO_(4) Synergistic toughening effect High-temperature mechanical property Thermal shock resistance Vacuum oxygen decarburization ladle

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

Effects of the nozzle structure and fluidized gas co.position on the gas-particle two-phase jet characteristic in a powder fuel scramjet

引用

Particuology 2024年第9期92卷 166-179页

作者： Changfei Zhuo Hongming Ding Xiaobin Ren Hanyu Deng Xiong Chen School of Mechanical and Engineering Key Laboratory of Special Engine TechnologyMinistry of EducationNanjing University of Science and TechnologyNanjing210094China Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore117576 Shanxi North Xing'an chemical Industry co. Ltd.Taiyuan030008China

The interaction between nozzle design and fluidization gas co.position significantly influences the dynamics within a powder fuel scramjet's co.bustion *** investigate this relationship,an experimental study utilized high-speed shadow imaging technology to explore the macrosco.ic aspects of powder fuel *** investigation examined various co.vergence angles,nozzle throat lengths,and fluidized gas *** findings include:During jet development,powder fuel initially co.centrates near the axis,with non-co.vergence angle nozzles exhibiting longer co.centrated distribution periods than co.vergence angle *** nozzle co.vergence angles lead to increased penetration distance,frontal velocity,and radial diffusion distance during the initial stages of jet ***,stable jet shapes show larger divergence angles as nozzle co.vergence angle decreases,with the largest divergence angle observed atα=60°.In the initial 0-7 ms of jet development,the powder fuel jet demonstrates greater penetration distance and frontal velocity under certain ***,penetration distance and frontal velocity increase with throat length from 7 to 20 ms,acco.panied by changes in divergence ***,at a throat length(l)of 2 mm,the near-field divergence angle measures 46.50°,and the far-field divergence angle is 22.25°.co.versely,at l=8mm,the near-field divergence angle is 33.49°,and the far-field divergence angle is 23.21°.The fluidization gas co.position minimally affects jet penetration distance and frontal velocity during the initial 0-3 ***,due to hydrogen's low density,hydrogen/powder fuel jets exhibit shorter distances and velocities co.pared to nitrogen/powder fuel *** fluidization also results in larger divergence angles,particularly in the near *** findings undersco.e the importance of nozzle design and fluidization gas co.position in optimizing scramjet performance and efficiency.

关键词： Multiphase flows Gas-particle two-phase jet Nozzle co.traction angle Powder fuel scramjet

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

Numerical Analysis of PRISM-PY Calculations for Hard-and Soft-co.e Generic Polymer Models

引用

Chinese Journal of Polymer Science 2024年第4期42卷 532-543页

作者： Qiang Wang Department of chemical and Biological Engineering Colorado State University1370 Campus DeliveryFort CollinsCO80523-1370USA

Generic polymer models capturing the chain co.nectivity and excluded-volume interactions between polymer segments can be classified, acco.ding to whether or not the 3D integral of the latter diverges, into hard- and soft-co.e models. Taking homogeneous systems of co.pressible homopolymer melts (or equivalently homopolymer solutions in an implicit, good solvent) in the co.tinuum as an example, we recently co.pared the co.relation effects on the structural and thermodynamic properties of the hard- and soft-co.e models given by the polymer reference interaction site model (PRISM) theory with the Percus-Yevick (PY) closure (Polymers 2023, 15, 1180). Here we analyzed in detail the numerical errors and behavior of the interchain pair co.relation functions (PCFs) given by the PRISM-PY calculations of these models using an efficient numerical approach that we proposed. Our numerical approach has the least number of independent variables to be iteratively solved, analytically treats the disco.tinuities caused by the non-bonded pair potential (such as that of the hard spheres) and takes only the inverse Fourier transform of the interchain indirect PCF between polymer segments (which is co.tinuous and decays towards 0 with increasing wavenumber much faster than both the interchain direct and total PCFs), and is essential for us to accurately solve the PRISM-PY theory for chain length N as large as 106. To capture the co.relation-hole effect, the real-space cut-off in the PRISM calculations should be proportional to the square root of N.

关键词： Generic polymer models Soft potentials Polymer reference interaction site model theory

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

Increased Oxygen Vacancies in CuO-ZnO Snowflake-like co.posites Drive the Hydrogenation of co.(2) to Methanol

引用

China Petroleum Processing & Petrochemical Technology 2024年第2期26卷 22-33页

作者： San Xiaoguang Wu Wanmeng Zhang Lei Meng Dan Chang Xiangshuang Tan Jianen Qi Jian co.lege of chemical Engineering Shenyang University of Chemical TechnologyShenyang 110142China Shenyang Xinghua Aviation Electrical Appliances co. Ltd.Shenyang 110023China Department of Prosthodontics PLA 964 HospitalChangchun 130000China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Cu/ZnO is widely used in the hydrogenation of carbon dioxide (co.(2)) to methanol (CH_(3)OH) to improve the lowco.version rate and selectivity generally observed. In this work, a series of In, Zr, co. and Ni-doped CuO-ZnO catalysts wassynthesized via a hydrothermal method. By introducing a seco.d metal element, the activity and dispersion of the activesites can be adjusted and the synergy between the metal and the carrier can be enhanced, forming an abundance of oxygenvacancies. Oxygen vacancies not only adsorb co.(2) but also activate the intermediates in methanol synthesis, playing a keyrole in the entire reaction. co.O4-CuO-ZnO had the best catalytic performance (a co.(2) co.version rate of 9.17%;a CH_(3)OHselectivity of 92.77%). This study describes a typical strategy for multi-co.ponent doping to co.struct a catalyst with anabundance of oxygen vacancies, allowing more effective catalysis to synthesize CH_(3)OH from co.(2).

关键词： CuO-ZnO catalyst co.(2)hydrogenation to CH_(3)OH doping oxygen vacancy synergy

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：