检索结果-南通市图书馆

Based on non-targeted metabolomics for differential components screening of Rosae Chinensis Flos and Rosae Rugosae Flos and their quality evaluation

引用

Traditional Medicine Research 2025年第2期10卷 1-15页

作者： Xu Liang Ni-hui zhan. Zhi-Lai zhan.Guang-Lu Chang Yan Gao Xia Li Wen-Yuan Gao School of Pharmaceutical Science and Technology Faculty of MedicineTianjin UniversityTianjin 300193China State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs China Academy of Chinese Medical SciencesBeijing 100700China Key Laboratory of Modern Chinese Medicine Resources Research Enterprises Tianjin 300402China

Background:Rosa chinensis *** Rosa rugosa *** not only of ornamental value,but also edible flowers and the flower buds have been listed in the Chinese Pharmacopoeia as traditional *** two plants have some differences in efficacy,but the flower buds are easily confused for similar *** addition,large-scale cultivation of ornamental rose flowers may lead to a decrease in the effective components of medicinal ***,it is necessary to study the chemical composition and make quality evaluation of Rosae Chinensis Flos(Yueji)and Rosae Rugosae Flos(Meigui).Methods:In this study,40 batches of samples including Meigui and Yueji from different regions in China were collected to establish high-performance liquid chromatography ***,the fingerprints data was analyzed using principal component analysis,hierarchical cluster analysis,and partial least squares discriminant analysis analysis chemometrics to obtain information on intergroup differences,and non-targeted metabolomic techniques were applied to identify and compare chemical compositions of samples which were chosen from groups with large *** compounds were screened by orthogonal partial least-squares discriminant analysis and S-plot,and finally multi-component quantification was performed to comprehensively evaluate the quality of Yueji and ***:The similarity between the fingerprints of 40 batches roses and the reference print R was 0.73 to 0.93,indicating that there were similarities and differences between the *** principal component analysis and hierarchical cluster analysis of fingerprints data,the samples from different origins and varieties were intuitively divided into four *** least-squares discriminant analysis analysis showed that Meigui and Yueji cluster into two categories and the model was reliable.A total of 89 compounds were identified by high resolution mass spectrometry,mainly were flavonoids and flavon

关键词： Rosa chinensis Jacq. Rosa rugosa Thunb. metabolomics chemometrics multiple component quantification quality evaluation

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

Anomalous response to creep deformation from dislocation density during electrically assisted creep aging

引用

Rare Metals 2024年第10期43卷 5268-5283页

作者： Chang Zhou Li-Hua zhan.Chun-hui Liu Ming-hui Huang College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Light Alloys Research Institute State Key Laboratory of Precision Manufacturing for Extreme Service PerformanceCentral South UniversityChangsha 410083China

Adding numerous dislocations into metallic materials before the forming stage significantly enhances their ***,this beneficial effect of dislocation defects may not have a simple monotonic relationship with increased dislocation density during electroplastic *** is due to the complex interactions among the drifting electrons,dislocations and solute *** study explores the effect of diverse initial dislocation densities on creep deformation during electrically aided creep aging of an aluminum-lithium ***,we discovered a threshold value for the dislocation density that affects electroplastic creep,i.e.,an enhanced effect from dislocations weakens when exceeding this density threshold(an anomalous response to creep).Microstructural data also reveal that such an anomalous response originates mainly from differences in various dislocation density-tailored configurations,which can influence the dislocation motions and precipitation kinetics of the strengthening T1precipitates under the same action of pulsed *** study provides important insights into the dislocation density-mediated electroplastic creep of an aluminum-lithium alloy.

关键词： Creep aging Dislocation density Al-Cu-Li alloy Pulsed currents

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

Metalloporphyrin receptors for histidine-containing peptides

引用

Chinese Chemical Letters 2014年第5期25卷 659-662页

作者： hui Liu zhan.Ting Li Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering & PharmacyWuhan Institute of Technology State Key Laboratory of Bio-Organic and Natural Products Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences

Two new ditopic metalloporphyrin receptors constructed by combining metalloporphyrin with crown ethers have been prepared and characterized.1H NMR and MS spectra confirmed the complexation of receptor with peptide driven by coordination interaction and hydrogen ***/vis experiments revealed that the receptors exhibited high binding affinity to histidine-containing *** receptors could differentiate short peptides of C-terminal histidine and N-terminal histidine and formed the most stable complexes with tripeptide.

关键词： Metallop or phyrin Crown ether Synthetic receptor Peptide

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

Synthesis and characterization of LiNi_(0.95-x)Co_xAl_(0.05)O_2 for lithium-ion batteries

引用

Rare Metals 2006年第4期25卷 303-308页

作者： ZHU Xianjun zhan.hui LIU Hanxing ZHOU Yunhong State Key Laboratory of Advanced Technology and Processing for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China College of Chemical and Molecular Science Wuhan University Wuhan 430072 China

Samples of LiNi0.95-xCoxAl0.05O2 （x = 0.10 and 0.15） and LiNiO2, synthesized by the solid-state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3, and AI（OH）3 under an oxygen stream, were characterized by TG-DTA, XRD, SEM, and electrochemical tests. Simultaneous doping of cobalt and aluminum at the Ni-site in LiNiO2 was tried to improve the cathode performance for lithium-ion batteries. The results showed that co-doping （especially, 5 at.% A1 and 10 at.% Co） definitely had a large beneficial effect in increasing the capacity （186.2 mA.h/g of the first discharge capacity for LiNio.s.42OoaoAlo.0502） and cycling behavior （180.1 mA-h/g after 10 cycles for ***2） compared with 180.7 mA.h/g of the first discharge capacity and 157.7 mA.h/g of the tenth discharge capacity for LiNiO2, respectively. Differen- tial capacity versus voltage curves showed that the co-doped LiNio.95_***2 had less intensity of the phase transitions than the pristine LiNiO2.

关键词： electrochemistry LiNi0.95-xCoxAl0.05O2 lithium-ion batteries co-doping cathode materials LiNiO2

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

Isotropic Tuning of Electrochemical Etching forthe Nanometric Finishing of Metals

引用

Nanomanufacturing and Metrology 2022年第3期5卷 283-296页

作者： Rong Yi Zejin zhan.hui Deng Department of Mechanical and Energy Engineering Southern University of Science and TechnologyNo.1088Xueyuan RoadShenzhen 518055GuangdongChina

Isotropic etching polishing(IEP)based on the merging of isotropic etch pits has been proposed as a generic metal finishing *** this work,the tuning of the etching isotropy of various metals,which is the key to realizing the finishing effect of IEP,is studied by theoretical analysis and etching *** isotropic etching of various metals can be realized through mass transfer polarization by adjusting the electrochemical *** addition of sulfuric acid in the electrolyte is the most effective for tuning the isotropy of electrochemical *** can decrease the diffusion coefficient of metal ions,thereby increasing the resistance of mass transfer and transforming the electrochemical dissolution of metal into mass transfer *** this study,the atomic and close-to-atomic scale surface finishing of various metals and alloys has been successfully achieved through isotropic *** etching at a current of 1.5 A for 3 min,the surface Sa roughness of TA2 is drastically reduced from 242 to 3.98 *** etching for 1 min at a current of 3 A,the surface Sa roughness of pure tungsten,NiTi,and CoCrNi decreases from 9.33,76.4,and 37.6 nm,respectively,to 1.16,2.01,and 2.51 nm,respectively.

关键词： ACSM Metal finishing Isotropic etching polishing Electrochemical polishing

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

Synthesis and Characterization of LiNi_(0.85)Co_(0.15-x)Al_xO_2 as Cathode Materials for Lithium-ion Batteries

引用

Journal of Materials Science & Technology 2006年第1期22卷 35-39页

作者： Xianjun ZHU Pingchu CHEN hui zhan.Yunhong ZHOU College of Chemistry Central China Normal University Wuhan 430079 China College of Chemical and Molecular Science Wuhan University Wuhan 430072 China

LiNi0.85CO0.15-xAlxO2 samples （x=0.025, 0.05 and 0.10） were prepared by solid state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3 and Al（OH）3 under oxygen flow. Layered LiNiO2 simultaneously doped by Co-Al has been tried to improve the cathode performance. The results showed that substitution of optimum amount Al and Co for the Ni in LiNiO2 definitely had some beneficial effect on increasing the capacity and cycling behavior. When increasing x in LiNio.85CO0.15-xAlxO2, the initial discharge capacity decreased and its cyclability increased. Compromising high specific capacity and good cyclability, the optimum x in LiNi0.85Co0.15-xAlxO2 was x=0.05. As a consequence, LiNi0.85Co0.15-xAlxO2 had the first discharge capacity of 186.2 mAh/g and a capacity of 180.1 mAh/g after 10 cycles. Differential capacity vs voltage curves indicated that the co-doped LiNiO2 showed suppression of the phase transitions as compared with LiNiO2.

关键词： Cathode materials Co-doping LiNi0.85Co0.15-xAlxO2 Lithium ion batteries

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

Evolutionary Computation for Expensive Optimization:A Survey

引用

Machine Intelligence Research 2022年第1期19卷 3-23页

作者： Jian-Yu Li Zhi-hui zhan.Jun zhan. School of Computer Science and Engineering South China University of TechnologyGuangzhou 510006China Pazhou Laboratory Guangzhou 510330China Victoria University Melbourne 8001Australia

Expensive optimization problem(EOP) widely exists in various significant real-world applications. However, EOP requires expensive or even unaffordable costs for evaluating candidate solutions, which is expensive for the algorithm to find a satisfactory solution. Moreover, due to the fast-growing application demands in the economy and society, such as the emergence of the smart cities, the internet of things, and the big data era, solving EOP more efficiently has become increasingly essential in various fields, which poses great challenges on the problem-solving ability of optimization approach for EOP. Among various optimization approaches, evolutionary computation(EC) is a promising global optimization tool widely used for solving EOP efficiently in the past decades. Given the fruitful advancements of EC for EOP, it is essential to review these advancements in order to synthesize and give previous research experiences and references to aid the development of relevant research fields and real-world applications. Motivated by this, this paper aims to provide a comprehensive survey to show why and how EC can solve EOP efficiently. For this aim, this paper firstly analyzes the total optimization cost of EC in solving EOP. Then, based on the analysis, three promising research directions are pointed out for solving EOP, which are problem approximation and substitution, algorithm design and enhancement, and parallel and distributed computation. Note that, to the best of our knowledge, this paper is the first that outlines the possible directions for efficiently solving EOP by analyzing the total expensive cost. Based on this, existing works are reviewed comprehensively via a taxonomy with four parts, including the above three research directions and the real-world application part. Moreover, some future research directions are also discussed in this paper. It is believed that such a survey can attract attention, encourage discussions, and stimulate new EC research ideas f

关键词： Expensive optimization problem evolutionary computation evolutionary algorithm swarm intelligence particle swarm optimization differential evolution

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

A Unified Approach Toward Simulating Constant and Varying Amplitude Fatigue Failure Effects of Metals with Fast and Efficient Algorithms

引用

Acta Mechanica Solida Sinica 2021年第1期34卷 53-64页

作者： Si-Yu Wang Lin zhan.hui-Feng Xi Heng Xiao College of Mechanics and Construction Engineering and MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou510632China

A new finite strain elastoplastic J2-flow model is established with an explicit formulation of work-hardening and softening effects up to eventual failure,in which both a new flow rule free of yielding and an asymptotically vanishing stress limit are *** novelties of this new model are as follows:(i)Fatigue failure effects under repeated loading conditions with either constant or varying amplitudes are automatically characterized as inherent response features;(ii)neither additional damage-like variables nor failure criteria need to be involved;and(iii)both high-and low-cycle fatigue effects may be simultaneously treated.A fast and efficient algorithm of high accuracy is proposed for directly simulating high-and medium-high-cycle fatigue failure effects under repeated loading *** this goal,a direct and explicit relationship between the fatigue life and the stress amplitude is obtained by means of explicit and direct procedures of integrating the coupled elastoplastic rate equations for any given number of loading-unloading cycles with varying stress *** examples suggest that the new algorithm is much more fast and efficient than usual tedious and very time-consuming integration procedures.

关键词： Metals Finite strain Elastoplasticity Fatigue failure Direct algorithm

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

Effect of zirconium on inclusions and mechanical properties of China low activation martensitic steel

引用

Journal of Iron and Steel Research International 2021年第9期28卷 1168-1179页

作者： Guo-xing Qiu Dong-ping zhan.Lei Cao hui-shu zhan. School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Materials Engineering Department Hebei College of Industry and TechnologyShijiazhuang050091HebeiChina School of Metallurgy Engineering Liaoning Institute of Science and TechnologyBenxi117004LiaoningChina

The effects of 0.01–0.11 wt.%Zr on the inclusions,microstructure,tensile properties,and impact toughness of the China low activation martensitic steel were *** showed that Zr exhibits good deoxidation and desulfurization *** scanning electron microscope was used to examine the inclusions in the *** main inclusions in the alloys were Zr–Ta–O,Zr–O,and Zr–O–***,some blocky Zr-rich inclusions appeared in Zr-2 and Zr-3 *** martensitic structures were observed in the alloys,and average prior austenite grain sizes of 21.1,15.7,and 14.8µm were obtained for Zr-1,Zr-2,and Zr-3 steels,***,increasing Zr content of the steels deteriorated their mechanical property,owing to the blocky *** alloy with 0.01%Zr resulted in excellent mechanical properties due to the fine inclusions and the precipitation of Zr3V3C *** of 576 and 682 MPa were obtained for the yield strength and ultimate tensile strength of Zr-1 alloy,***,the ductile–brittle transition temperature of the alloy decreased to−85℃.

关键词： China low activation martensitic steel Zr Inclusion Tensile strength Ductile-to-brittle transition temperature

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

Phosphorus Removal of High Phosphorus Iron Ore by Gas-Based Reduction and Melt Separation

引用

Journal of Iron and Steel Research International 2010年第9期17卷 1-6页

作者： TANG hui-qing GUO zhan.cheng ZHAO Zhi-long Key Laboratory of Ecological and Recycle Metallurgy of Ministry of Education University of Science and Technology Beijing Beijing 100083 China

A new method （gas-based separation plus melt separation） has been proposed to remove phosphorus of the high phosphorus iron ore which was 1.25 % of phosphorus content and 50. 0% of iron content. HSC chemistry package and the coexistence theory of slag structure were adopted for theoretical analysis. The gas-based reduction was carried out using a fixed bed reactor and the ore sample of 80 g with an average particle size of 2 mm were reduced using CO or H2 at temperature of 1 073 K for 5 hours. 50 g of the reduced sample with 3.0% CaO as additive was then subjected to melt separation in an electric furnace at temperature of 1 873 K under Ar atmosphere. In each run, SEM, EDS, optical microscopic examination and chemical analysis of the reduced ore sample, the metal sample and the slag sample were conducted. Results of all gas-based reduction experiments showed that iron metallization ratios were some 65% and the phosphorus compounds in the ore remained unchanged. It was agreed well with the simula- tions except for the iron metallization rate being less than predicted value; this difference was attributed to kinetics. Results of melt separation experiments showed that P content in metal samples is 0.33% （metal sample from H2 reduction product） and 0.27% （metal sample from CO reduction product）. The phosphorus partition ratios of both cases were less than predicted values. Some P in the metal samples existed as slag inclusion was considered to be the reason for this discrepancy.

关键词： HSC chemistry package coexistence theory slag structure high phosphorus iron ore gas-based reduction melt separation

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：