检索结果-南通市图书馆

Science China Chemistry 2023年第7期66卷 1989-1996页

作者： Wei Deng Ying-Qian Zhou Shan-Nan Du Ze-Yu ruan Si-Guo Wu jun-Liang Liu Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-Sen UniversityGuangzhou 510006China

Crystal-field symmetry of lanthanide ions plays a critical role in suppressing quantum tunneling of magnetization(QTM)in single-molecule magnets(SMMs),but high-performance SMM design and modulation remain challenging only in view of the geometric symmetry of the first coordination ***,two bis(semicarbazone)/bis(thiosemicarbazone)dysprosium singleion magnets with pentagonal bipyramid geometry were reported,and bis(thiosemicarbazone)lanthanide complexes have never been reported to the best of our *** served as good archetypes to study the magneto-structural relationships based on the charge *** complex with more ideal geometric symmetry displays fast zero-field QTM with negligible“effective barrier”,owing to the defective charge *** modulating the transverse crystal field via the replacement of the O sites with the less charged and larger radius S atoms,it results in lower geometric but higher charge-distribution symmetry,giving rise to the significant suppression of QTM and the enhancement of reversal barrier up to ca.1,000 *** results demonstrate that the charge-distribution symmetry can be chemically tailored by modification of the crystal field,which is essential for designing high-performance SMMs.

关键词： single-molecule magnets crystal field symmetry strategy electrostatic potential analysis bis(thiosemicarbazone)

Confinement synergy at the heterointerface for enhanced oxygen evolution

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 8793-8799页

作者： Dongdi Wang Shanshan ruan Peiyu Ma Ruyang Wang Xilan Ding Ming Zuo Lidong Zhang Zhirong Zhang Jie Zeng jun Bao National Synchrotron Radiation Laboratory Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of SciencesKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China

Two-dimensional transition metal hydroxides with abundant reserves and low prices have played an indispensable role in energy catalytic *** reports indicated that the incorporation of Fe species into Co-based catalysts can synergistically enhance oxygen evolution reaction(OER)*** a heterointerface on the surface of Co-based catalysts can provide a platform to investigate the role of heterointerface in reaction ***,we constructed a Fe-O-Co heterointerface without electronic effect by depositing FeO_(x)clusters on the oxygen vacancies of CoOOH ***_(x)/CoOOH exhibited excellent OER intrinsic activity,which can deliver the turnover frequency(TOF)of 4.56 s^(-1)at the overpotentials of 300 mV and the Tafel slope of 33 mV·dec^(-1).In-situ electrochemical impedance spectroscopy(EIS)and density functional theory(DFT)calculations demonstrated that the synergistic effect between Fe sites and Co sites confined at the Fe-O-Co heterointerface accelerated the charge transfer during OER and optimized the adsorption of oxygen intermediates,consequently enhancing OER.

关键词： clusters heterointerface confinement synergy oxygen evolution reaction

Bibliometric Analysis of Global Research Progress on Coastal Flooding 1995–2016

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical Science 2018年第6期28卷 998-1008页

作者： GAO Chao ruan Tian Department of Geography & Spatial Information Techniques Ningbo University College of Territorial Resources and Tourism Anhui Normal University

Global research progress on coastal flooding was studied using a bibliometric evaluation of publications listed in the Web of Science extended scientific citation index. There was substantial growth in coastal flooding research output, with increasing publications, a higher collaboration index, and more references during the 1995–2016 period. The USA has taken a dominant position in coastal flooding research, with the US Geological Survey leading the publications ranking. Research collaborations at institutional scales have become more important than those at global scales. International collaborative publications consistently drew more citations than those from a single country. Furthermore, coastal flooding research included combinations of multi-disciplinary categories, including ‘Geology' and ‘Environmental Sciences & Ecology'. The most important coastal flooding research sites were wetlands and estuaries. While numerical modeling and 3 S(Remote sensing, RS; Geography information systems, GIS; Global positioning systems, GPS) technology were the most commonly used methods for studying coastal flooding, Lidar gained in popularity. The vulnerability and adaptation of coastal environments, their resilience after flooding, and ecosystem services function showed increases in interest.

关键词： coastal flood scientific outputs bibliometric analysis research trends Web of Science

Dynamic Response of Foundations during Startup of High-Frequency Tunnel Equipment

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第7期140卷 821-844页

作者： Dawei ruan Mingwei Hu College of Civil and Transportation Engineering Shenzhen UniversityShenzhen518060China State Key Laboratory of Intelligent Geotechnics and Tunnelling Shenzhen UniversityShenzhen518060China Key Laboratory of Coastal Urban Resilient Infrastructures of Ministry of Education Shenzhen UniversityShenzhen518060China Underground Polis Academy Shenzhen UniversityShenzhen518060China Shenzhen Key Laboratory of Green Efficient and Intelligent Construction of Underground Metro StationShenzhen UniversityShenzhen518060China

The specialized equipment utilized in long-line tunnel engineering is evolving towards large-scale,multifunctional,and complex *** vibration caused by the high-frequency units during regular operation is supported by the foundation of the units,and the magnitude of vibration and the operating frequency fluctuate in different engineering contexts,leading to variations in the dynamic response of the *** high-frequency units yield significantly diverse outcomes under different startup conditions and times,resulting in failure to meet operational requirements,influencing the normal function of the tunnel,and causing harm to the foundation structure,personnel,and property in severe *** article formulates a finite element numerical computation model for solid elements using three-dimensional elastic body theory and integrates field measurements to substantiate and ascertain the crucial parameter configurations of the finite element *** proposing a comprehensive startup timing function for high-frequency dynamic machines under different startup conditions,simulating the frequency andmagnitude variations during the startup process,and suggesting functions for changes in frequency and magnitude,a simulated startup schedule function for high-frequency machines is created through *** into account the selection of the transient dynamic analysis step length,the dynamic response results for the lower dynamic foundation during its fundamental frequency crossing process are *** validation checks if the structural magnitude surpasses the safety threshold during the critical phase of unit startup traversing the structural resonance *** design recommendations for high-frequency units’dynamic foundations are provided,taking into account the startup process of the machine and ensuring the safe operation of the tunnel.

关键词： Tunnel equipment high-frequency units startup conditions transient dynamics dynamic response foundation design

Characterization of lipid compositions, minor components and antioxidant capacities in macadamia (Macadamia integrifolia) oil from four major areas in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Bioscience 2022年第6期50卷 327-334页

作者： Xixiang Shuai Taotao Dai Mingshun Chen Cheng-mei Liu Roger ruan Yuhuan Liu jun Chen State Key Laboratory of Food Science and Technology Nanchang UniversityNanchang330047China Agro-products Processing Science and Technology Research Institute Guangxi Academy of Agricultural SciencesNanning530007China

Macadamia is rich in lipids and considered as a source of high-quality oil. In this study, fatty acids, triacylglycerols, minor components and antioxidant activities of macadamia oils (MOs) from four cultivated regions (YN: Yunnan Province;GZ: Guizhou Province;GX: Guangxi Province;GD: Guangdong Province) in China were systematically analyzed by modern chromatography (Gas chromatography, high performance liquid chromatography, inductively coupled plasma mass spectrometry and ultraviolet spectroscopy). The analysis indicated macadamia oil enriched in unsaturated fatty acids (UFA), including 62.4%–65.6% oleic acid and 11.4%–17.3% palmitoleic acid. Among the four cultivated regions, the MO from YN exhibited the highest contents of UFA (85.0%) and palmitoleic acid. In addition, the minor components and antioxidant activities of MO from four cultivation areas showed a significant difference, which GX-MO had the highest contents of α-tocotrienols (58.9 mg/kg) and phytosterols (2310.4 mg/kg), while GZ-MO was rich in squalene (626.7 mg/kg) and YN-MO had the highest levels of polyphenols (71.0 mg GAE/kg) and antioxidant capacity. Based on the correlation analysis, the polyphenols and α-tocotrienols had a remarkable contribution on the antioxidant activities of MO. Furthermore, the cultivation areas of MO can be distinguished according to the analysis of hierachical cluster analysis and principal components. Our studies offer a potential guidance for the identification of MO and its application in food industry.

关键词： Macadamia oil Cultivation areas Minor components Cluster analysis Antioxidant activities

Boosting Seed Development as a New Strategy to Increase Cotton Fiber Yield and Quality

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 Integrative Plant Biology 2013年第7期55卷 572-575页

作者： Yong-Ling ruan Department of Biology School of Environmental and Life SciencesThe University of Newcastle Australia Australia-China Research Centre for Crop ImprovementThe University of Newcastle

Cotton （Gossypium spp.） is the most important textile crop worldwide due to its cellulosic mature fibers, which are single-celled hairs initiated from the cotton ovule epidermis at anthesis. Research to improve cotton fiber yield and quality in recent years has been largely focused on identifying genes regulating fiber cell initiation, elonga- tion and cellulose synthesis. However, manipulating some of those candidate genes has yielded no effect or only a marginally positive effect on fiber yield or quality. On the other hand, evolutionary comparison and transgenic studies have clearly shown that cotton fiber growth is intimately controlled by seed development. Therefore,I propose that enhancing seed development could be a more effective and achievable strategy to increase fiber yield and quality.

关键词： Auxin cotton fiber seed development sugars seed maternal and filial tissues.

ADAPTIVE REGULARIZED QUASI-NEWTON METHOD USING INEXACT FIRST-ORDER INFORMATION

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2024年第6期42卷 1656-1687页

作者： Hongzheng ruan Weihong Yang School of Mathematical Sciences Fudan UniversityShanghai 200433P.R.China

Classical quasi-Newton methods are widely used to solve nonlinear problems in which the first-order information is *** some practical problems,we can only obtain approximate values of the objective function and its *** is necessary to design optimization algorithms that can utilize inexact first-order *** this paper,we propose an adaptive regularized quasi-Newton method to solve such *** some mild conditions,we prove the global convergence and establish the convergence rate of the adaptive regularized quasi-Newton *** implementations of our method,including the subspace technique to reduce the amount of computation,are *** numerical results demonstrate that the adaptive regularized quasi-Newton method is a promising method,which can utilize the inexact first-order information effectively.

关键词： Inexact first-order information Regularization Quasi-Newton method

BSAlign:A Library for Nucleotide Sequence Alignment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2024年第2期22卷 135-142页

作者： Haojing Shao Jue ruan Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China

Increasing the accuracy of the nucleotide sequence alignment is an essential issue in genomics *** classic dynamic programming(DP)algorithms(e.g.,Smith–Waterman and Needleman–Wunsch)guarantee to produce the optimal result,their time complexity hinders the application of large-scale sequence *** optimization efforts that aim to accelerate the alignment process generally come from three perspectives:redesigning data structures[e.g.,diagonal or striped Single Instruction Multiple Data(SIMD)implementations],increasing the number of parallelisms in SIMD operations(e.g.,difference recurrence relation),or reducing search space(e.g.,banded DP).However,no methods combine all these three aspects to build an ultra-fast *** this study,we developed a Banded Striped Aligner(BSAlign)library that delivers accurate alignment results at an ultra-fast speed by knitting a series of novel methods together to take advantage of all of the aforementioned three perspectives with highlights such as active F-loop in striped vectorization and striped move in banded *** applied our new acceleration design on both regular and edit distance pairwise *** achieved 2-fold speed-up than other SIMD-based implementations for regular pairwise alignment,and 1.5-fold to 4-fold speed-up in edit distance-based implementations for long *** is implemented in C programing language and is available at https://***/ruanjue/bsalign.

关键词： Pairwise alignment Edit distance Striped vectorization Banded dynamic programming F evaluation

Design and Analysis of a Multi-Legged Robot with Pitch Adjustive Units

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2021年第3期34卷 226-242页

作者： Qiang ruan Jianxu Wu Yan-an Yao Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control TechnologyMinistry of EducationBeijing Jiaotong UniversityBeijing 100044China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

The paper proposes a novel multi-legged robot with pitch adjustive units aiming at obstacle *** only 6 degrees of freedom,the robot with 16 mechanical legs walks steadily and surmounts the obstacles on the complex *** leg unit with adjustive pitch provides a large workspace and empowers the legs to climb up obstacles in large sizes,which enhances the obstacle surmounting *** pitch adjustment in leg unit requires as few independent adjusting actuators as *** on the kinematic analysis of the mechanical leg,the biped and quadruped leg units with adjustive pitch are analyzed and *** configuration of the robot is designed to obtain a compact structure and pragmatic *** uncertainty of the obstacle size and position in the surmounting process is taken into consideration and the parameters of the adjustments and the feasible strategies for obstacle surmounting are *** the 3D virtual model and the robot prototype are built and the multi-body dynamic simulations and prototype experiments are carried *** results from the simulations and the experiments show that the robot possesses good obstacle surmounting capabilities.

关键词： Mechanical leg Multi-legged robot Obstacle surmounting Adjustive pitch Leg unit

Label-free detection repeatability of protein microarrays by oblique-incidence reflectivity difference method

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2347-2350页

作者： DAI jun LI Lin WANG JingYi HE LiPing LU HuaBin ruan KangCheng JIN KuiJuan YANG GuoZhen Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Molecular Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China

We examine the repeatabilities of oblique-incidence reflectivity difference(OIRD) method for label-free detecting biological molecular interaction using protein *** experimental results show that the repeatabilities are the same in a given microarray or microarray-microarray and are consistent,indicating that OIRD is a promising label-free detection technique for biological microarrays.

关键词： oblique-incidence reflectivity difference(OIRD) protein microarrays specificity repeatability