检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

数字技术驱动下中国民歌变革及应对策略研究

湖北科技学院学报 2025年第1期45卷 80-85页

作者：胡娟方元河南职业技术学院音乐学院河南郑州450046

数字科技的崛起对音乐创作和传播方式带来了革命性的变化,同时也对中国民歌的传承和发展提出了新的课题。本研究旨在深入探讨数字化发展对中国民歌的影响,包括作品表演形式与作品的传承与创新,并详细分析其所面临的挑战和机遇,提出相应... 详细信息

数字科技的崛起对音乐创作和传播方式带来了革命性的变化,同时也对中国民歌的传承和发展提出了新的课题。本研究旨在深入探讨数字化发展对中国民歌的影响,包括作品表演形式与作品的传承与创新,并详细分析其所面临的挑战和机遇,提出相应的对策和建议。通过理论支持和实践指导,期望为传承和创新中国民歌作出积极贡献。

关键词：数字技术中国民歌变革应对

锆基金属有机框架捕获黄连中的生物碱类药物活性成分

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

分析测试学报 2025年第1期44卷 188-194页

作者：司甜甜赵薇王慧张红玉刘小烨容蓉冯娟娟山东中医药大学药学院山东济南250355 济南大学化学化工学院山东济南250022

采用溶剂热法制备了锆基MOF-808,利用其结构优势实现了中药黄连中生物碱类药物活性成分的富集与捕获,并结合其结构特点探讨了其协同低共熔溶剂捕获生物碱类活性成分过程中的相互作用。通过优化孵育捕获等条件,对黄连粗提液中药根碱的回... 详细信息

采用溶剂热法制备了锆基MOF-808,利用其结构优势实现了中药黄连中生物碱类药物活性成分的富集与捕获,并结合其结构特点探讨了其协同低共熔溶剂捕获生物碱类活性成分过程中的相互作用。通过优化孵育捕获等条件,对黄连粗提液中药根碱的回收率达到85.78%,结合高效液相色谱技术建立了检测黄连粗提液中5种生物碱类活性成分的方法。方法的线性范围为0.1~300μg·L^(-1),检出限为0.02~0.05μg·L^(-1),相对标准偏差为0.40%~4.7%,加标回收率达到69.7%~128%。该研究实现了中药黄连中生物碱类活性成分的高效、快速富集与捕获,为MOFs材料在选择性捕获与富集中药有效成分等领域的研究提供了新思路。

关键词：金属有机框架选择性富集色谱分离生物碱活性成分黄连

Conserved quantities and adiabatic invariants of fractional Birkhoffian system of Herglotz type

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第4期29卷 303-311页

作者： juan-juan Ding Yi Zhang School of Mathematics and Physics Suzhou University of Science and TechnologySuzhou 215009China College of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011China

In order to further study the dynamical behavior of nonconservative systems,we study the conserved quantities and the adiabatic invariants of fractional Brikhoffian systems with four kinds of different fractional derivatives based on Herglotz differential variational ***,the conserved quantities of Herglotz type for the fractional Brikhoffian systems based on Riemann-Liouville derivatives and their existence conditions are established by using the fractional Pfaff-Birkhoff-d Alembert principle of Herglotz ***,the effects of small perturbations on fractional Birkhoffian systems are studied,the conditions for the existence of adiabatic invariants for the Birkhoffian systems of Herglotz type based on Riemann-Liouville derivatives are established,and the adiabatic invariants of Herglotz type are ***,the conserved quantities and adiabatic invariants for the fractional Birkhoffian systems of Herglotz type under other three kinds of fractional derivatives are established,namely Caputo derivative,Riesz-Riemann-Liouville derivative and Riesz-Caputo ***,an example is given to illustrate the application of the results.

关键词： fractional Birkhoffian system Pfaff-Birkhoff-d’Alembert principle adiabatic invariant Herglotz generalized variational principle

Solvent Property Induced Morphological Changes of ABA Amphiphilic Triblock Copolymer Micelles in Dilute Solution: A Self-consistent Field Simulation Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2014年第12期32卷 1704-1713页

作者： juan-juan Fan Yuan-yuan Han 崔杰 College of Information Technology Jilin Agricultural University State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences

The morphological changes of ABA amphiphilic triblock copolymer micelles in dilute solution were systematically studied by tuning the solvent property using self-consistent field simulation. The solvent property was tuned by changing the Flory-Huggins interaction parameters between each type of blocks and solvent, respectively. The simulation results show that by changing the solvent properties, a series of micelle morphologies such as vesicle, cage-like, ring-shaped, rod-like and spherical micelle morphologies can be obtained. Variations of the free energy of the solution system and the surface area of micelles with the Flory-Huggins interaction parameters were calculated to better understand the effect of solvent property on micelle morphologies. In addition, a phase diagram showing the morphological changes of micelles with the Flory-Huggins interaction parameters is provided.

关键词： Solvent property Triblock copolymer Self-consistent field Simulation.

New open clusters found by manual mining of data based on Gaia DR2

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第5期21卷 147-154页

作者： juan Casado Facultad de Ciencias Universidad Autnoma de Barcelona08193BellaterraCataloniaSpain

The physical nature of a series of 20 new open clusters is confirmed employing existing data on putative star members,mainly from the second Gaia Data Release(DR2).The clusters were discovered as overdensities of stars by visual inspection of either photographic DSS plates or proper motion plots of random source *** reported objects are not present in the most comprehensive or recent catalogs of stellar clusters and *** all of them,clumps of comoving stars are revealed in the proper motion *** parallaxes of the clumped stars are compatible with the real existence of open clusters over narrow ranges of *** density calculations,free of most noise from non-member sources,allow differentiating a cluster core and an extended cluster corona in some ***-magnitude diagrams generally show a definite main sequence that allows confirmation of the physical existence of the clusters and some of their *** of the new clusters seem to form a double system with a common *** of the new clusters challenge the claim of near completeness of the known OC population in the distance range from 1.0 to 1.8 kpc from the Sun(Kharchenko et al.).

关键词： astronomical databases:miscellaneous parallaxes proper motions(stars:)Hertzsprung-Russell CCM diagrams(Galaxy:)open clusters associations:individual

Polycyclic aromatic hydrocarbon biodegradation and extracellular enzyme secretion in agitated and stationary cultures of Phanerochaete chrysosporium

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第1期20卷 88-93页

作者： DING juan CONG Jun ZHOU juan GAO Shixiang State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China School of the Energy and Environment Southeast University Nanjing 210096 China

The extracellular enzyme secretion and biodegradation of polycyclic aromatic hydrocarbons （PAHs） were studied in agitated and shallow stationary liquid cultures of Phanerochaete chrysosporium. Veratryl alcohol and Tween80 were added to cultures as lignin peroxidase （LIP） and manganese peroxidase （MnP） inducer, respectively. Shallow stationary cultures were suitable for the production of enzyme, whereas agitated cultures enhanced overall biodegradation by facilitating interphase mass transfer of PAHs into aqueous phases. The use of a LiP stimulator, veratryl alcohol, did not increase PAH degradation but significantly enhanced LiP activity. In contrast, Tween80 increased both MnP secretion and PAH degradation in shallow stationary cultures. On the other hand, high PAH degradation was observed in agitated cultures in the absence of detectable LiP and MnP activities. The results suggested that extracellular peroxidase activities are not directly related to the PAH degradation, and the increased solubility rather than enzyme activity may be more important in the promotion of PAH degradation.

关键词： lignin peroxidase (LIP) manganese peroxidase (MnP) Phanerochaete chrysosporium polycyclic aromatic hydrocarbons (PAHs) solubilization

Neural Network Based on Quantum Chemistry for Predicting Melting Point of Organic Compounds

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2009年第1期22卷 19-26页

作者： juan A. Lazzus Departamento de Fisica Universidad de La Serena Casilla 554 La Serena Chile

The melting points of organic compounds were estimated using a combined method that includes a backpropagation neural network and quantitative structure property relationship （QSPR） parameters in quantum chemistry. Eleven descriptors that reflect the intermolecular forces and molecular symmetry were used as input variables. QSPR parameters were calculated using molecular modeling and PM3 semi-empirical molecular orbital theories. A total of 260 compounds were used to train the network, which was developed using MatLab. Then, the melting points of 73 other compounds were predicted and results were compared to experimental data from the literature. The study shows that the chosen artificial neural network and the quantitative structure property relationships method present an excellent alternative for the estimation of the melting point of an organic compound, with average absolute deviation of 5%.

关键词： Melting point Quantitative structure-property relationship Artificial neural network Quantum chemistry

Ni nanoparticles confined by yolk-shell structure of CNT-mesoporous carbon for electrocatalytic conversion of CO_(2): Switching CO to formate

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

Journal of Energy Chemistry 2022年第7期31卷 224-229,I0006页

作者： juan Du Aibing Chen College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018HebeiChina

Electrochemical reduction of CO_(2)(CO_(2)ER) to formate has been a promising route to produce value-added *** low-cost and efficient electrocatalysts with high product selectivity is still a grand ***,a novel Ni nanoparticles-anchored CNT coated by mesoporous carbon with yolk-shell structure (CNT/Ni@mC) catalysis was designed for CO_(2)*** nanoparticles were confined in the cavity between CNT and mesoporous carbon shell and the confined space can be controlled by tuning the amount of silica *** mesoporous carbon shell and confined space are beneficial to charge transmission during CO_(2)*** contrast to previous studies,the CNT/Ni@mC catalyst presents selectivity toward formate rather than *** in situ attenuated total reflection Fourier transform infrared spectroscopy measurements indicate the presence of a COO* intermediate that converts to formate under CO_(2)ER *** well-defined structural feature of the confined space of the Ni-based catalyst for selective CO_(2)ER to formate may facilitate in-depth mechanistic understandings on structural factors that affect CO_(2)ER performance.

关键词： Carbon dioxide electrochemical reduction Nickel-based catalyst Formate Yolk-shell CNT

在线全文

学校读者我要写书评

暂无评论

烟曲霉外排泵唑类耐药研究进展

医学分子生物学杂志 2025年第1期22卷 97-100页

作者：王娟马彦山西医科大学第二医院皮肤性病科太原市030001

烟曲霉是一种广泛存在于自然界的机会性病原体,可引起侵袭性曲霉病,在免疫功能低下的患者中死亡率很高。三唑类药物是侵袭性曲霉病的一线治疗药物,然而近年来全球范围内烟曲霉唑类耐药分离株不断增多,极大地威胁到患者的生命健康。外排... 详细信息

烟曲霉是一种广泛存在于自然界的机会性病原体,可引起侵袭性曲霉病,在免疫功能低下的患者中死亡率很高。三唑类药物是侵袭性曲霉病的一线治疗药物,然而近年来全球范围内烟曲霉唑类耐药分离株不断增多,极大地威胁到患者的生命健康。外排泵由跨膜蛋白质组成,可以将不需要的物质排出细胞,对微生物的存活有着重要的保护作用,与此同时,研究表明它还介导了微生物的耐药。文章综述了近年来关于烟曲霉药物外排泵的功能及调控机制的研究进展,为深入理解烟曲霉耐药机制及筛选抗烟曲霉感染药物新靶点提供理论基础。

关键词：烟曲霉耐药外排泵