检索结果-南通市图书馆

Heterointerface Engineering of β‑Chitin/Carbon Nano‑Onions/Ni-P Composites with Boosted Maxwell‑Wagner‑Sillars Effect for Highly Efficient Electromagnetic Wave Response and Thermal Management

引用

Nano-Micro Letters 2022年第5期14卷 206-223页

作者： Fei Pan Lei Cai Yuyang Shi Yanyan Dong Xiaojie Zhu Jie Cheng Haojie jiang Xiao Wang yifeng jiang Wei Lu Shanghai Key Laboratory of D&A for Metal‑Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804People’s Republic of China School of Materials Science and Engineering University of New South WalesSydney 2052Australia

The rational construction of microstructure and composition with enhanced Maxwell-Wagner-Sillars effect(MWSE)is still a challenging direction for reinforcing electromagnetic wave(EMW)absorption performance,and the related EMW attenuation mechanism has rarely been elucidated.Herein,MWSE boostedβ-chitin/carbon nano-onions/Ni–P composites is prepared according to the heterointerface engineering strategy via facile layer-by-layer electrostatic assembly and electroless plating techniques.The heterogeneous interface is reinforced from the aspect of porous skeleton,nanomaterials and multilayer construction.The composites exhibit competitive EMW response mechanism between the conductive loss and the polarization/magnetic loss,as describing like the story of“The Hare and the Tortoise”.As a result,the composites not only achieve a minimum reflection loss(RL_(min))of−50.83 dB and an effective bandwidth of 6.8 GHz,but also present remarkable EMW interference shielding effectiveness of 66.66 dB.In addition,diverse functions such as good thermal insulation,infrared shielding and photothermal performance were also achieved in the hybrid composites as a result of intrinsic morphology and chemicophysics properties.Therefore,we believe that the boosted MWSE open up a novel orientation toward developing multifunctional composites with high-efficient EMW response and thermal management.

关键词： β-chitin Nano onion carbon Electromagnetic wave absorption Electromagnetic interference shielding Photothermal

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

Bioactive materials from berberine-treated human bone marrow mesenchymal stem cells promote alveolar bone regeneration by regulating macrophage polarization

引用

Science China(Life Sciences) 2024年第5期67卷 1010-1026页

作者： Ziyue Qin Yanxing Han Yifei Du Yixuan Zhang yifeng Bian Ruyu Wang Haoran Wang Fanyi Guo Hua Yuan Yongchu Pan Jianliang Jin Qigang Zhou Yuli Wang Feng Han Yan Xu Jiandong jiang Department of Oral and Maxillofacial Surgery The Affiliated Stomatological Hospital of Nanjing Medical UniversityNanjing 210029China jiangsu Province Key Laboratory of Oral Diseases Nanjing Medical UniversityNanjing 210029China jiangsu Province Engineering Research Center of Stomatological Translational Medicine Nanjing 210029China State Key Laboratoryof BioactiveSubstances andFunction of Natural Medicine Instituteof Materia MedicaChinese Academyof MedicalSciencesandPeking Union MedicalCollegeBeijing100050China Gusu school Nanjing medical universitySuzhou 215002China Key Laboratory of Cardiovascular&Cerebrovascular Medicine Drug Target and Drug Discovery CenterSchool of PharmacyNanjing Medical UniversityNanjing 211166 China Department of Orthodontics The Affiliated Stomatological Hospital of Nanjing Medical UniversityNanjing 210029China Department of Human Anatomy Research Centre for Bone and Stem CellsKey Laboratory for Aging&DiseaseThe State Key Laboratory of Reproductive MedicineNanjing Medical UniversityNanjing 211166China Department of Clinical Pharmacology School of PharmacyNanjing Medical UniversityNanjing Jiangsu211166China Department of Periodontology The Affiliated Stomatological Hospital of Nanjing Medical UniversityNanjing 210029China Department of Virology Institute of Medicinal BiotechnologyChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China

Alveolar bone regeneration has been strongly linked to macrophage polarization.M1 macrophages aggravate alveolar bone loss,whereas M2 macrophages reverse this process.Berberine(BBR),a natural alkaloid isolated and refined from Chinese medicinal plants,has shown therapeutic effects in treating metabolic disorders.In this study,we first discovered that culture supernatant(CS)collected from BBR-treated human bone marrow mesenchymal stem cells(HBMSCs)ameliorated periodontal alveolar bone loss.CS from the BBR-treated HBMSCs contained bioactive materials that suppressed the M1 polarization and induced the M2 polarization of macrophages in vivo and in vitro.To clarify the underlying mechanism,the bioactive materials were applied to different animal models.We discovered macrophage colony-stimulating factor(M-CSF),which regulates macrophage polarization and promotes bone formation,a key macromolecule in the CS.Injection of pure M-CSF attenuated experimental periodontal alveolar bone loss in rats.Colony-stimulating factor 1 receptor(CSF1R)inhibitor or anti-human M-CSF(M-CSF neutralizing antibody,Nab)abolished the therapeutic effects of the CS of BBR-treated HBMSCs.Moreover,AKT phosphorylation in macrophages was activated by the CS,and the AKT activator reversed the negative effect of the CSF1R inhibitor or Nab.These results suggest that the CS of BBR-treated HBMSCs modulates macrophage polarization via the M-CSF/AKT axis.Further studies also showed that CS of BBR-treated HBMSCs accelerated bone formation and M2 polarization in rat teeth extraction sockets.Overall,our findings established an essential role of BBR-treated HBMSCs CS and this might be the first report to show that the products of BBR-treated HBMSCs have active effects on alveolar bone regeneration.

关键词： berberine human bone marrow mesenchymal stem cells alveolar bone regeneration macrophage colony-stimulating factor AKT phosphorylation

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

Kinetic analysis and bacterium metabolization of α-pinene by a novel identified Pseudomonas sp.strain

引用

Journal of Environmental Sciences 2012年第10期24卷 1806-1815页

作者： Zhuowei Cheng Pengfei Sun yifeng jiang Lili Zhang Jianmeng Chen Engineering Research Center of the Ministry of Education for Bioconversion and Biopurificationm Zhejiang University of Technology Hangzhou 310032 China. College of Biological and Environmental Engineering Zhejiang University of Technology Hangzhou 310032 China

Biodegradation has become a popular alternative remediation technology for its economic and ecological advantages. An aerobic bacterium （strain ZW） capable of degrading α-pinene was isolated from a biofilter by a selective enrichment. Based on the 16S rRNA gene analysis and physiochemical properties, this strain was identified as Pseudomonas veronii. Under the optimized condition achieved by the response surface methodology （RSM）, as well as pH 6.82, temperature 26.3℃ and NaC1 concentration 1.36%, almost 100% α-pinene could be removed within 45 hr. Enzymatic biodegradation by the crude intracellular enzyme could be described well by the Michaelis-Menten model in which the maximum degradation rate Vraax and the half-saturation constant Km were calculated to be 0.431 mmol/（L.min） and 0.169 mmol/L, respectively. Activity assay of catechol suggested that the strain ZW possessed a catechol- 1,2-dioxygenase and could decompose benzene-ring through ortho ring cleavage. Based on the identified intermediates by GC/MS, a new metabolic pathway was proposed, in which the final metabolites were some simpler organic and inorganic compounds. The present work demonstrated that the strain ZW would have a great application prospect for the remediation of α-pinene-contaminated environment.

关键词： Pseudomonas veronii ct-pinene growth conditions kinetics analysis metabolic pathway

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

Removal characteristics and kinetic analysis of an aerobic vapor-phase bioreactor for hydrophobic alpha-pinene

引用

Journal of Environmental Sciences 2012年第8期24卷 1439-1448页

作者： yifeng jiang Shanshan Li Zhuowei Cheng Runye Zhu Jianmeng Chen College of Biological and Environmental Engineering Zhejiang University of Technology Hangzhou 310032 China Engineering Research Center of the Ministry of Education for Bioconversion and Biopurification Zhefiang University of Technology Hangzhou 310032 China

Biofiltration is considered an effective method to control volatile organic compounds （VOCs） pollution. This study was conducted to evaluate the potential use of a bacterial biofilter packed with wood chips and peat for the removal of hydrophobic α-pinene. When inoculated with two pure degraders and adapted activated sludge, a removal efficiency （RE） of more than 95% was achieved after a start- up period of 11 days. The maximum elimination capacity （EC） of 50 g/（m^3.hr） with RE of 94% was obtained at empty bed retention time （EBRT） of 102 sec. When higher α-pinene concentrations and shorter EBRTs were applied, the REs and ECs decreased significantly due to mass-transfer and biological reaction limitations. As deduced from the experimental results, approximately 74% of ct-pinene were completely mineralized by the consortiums and the biomass yield was 0.60 g biomass/g α-pinene. Sequence analysis of the selected bands excised from denaturing gradient gel electrophoresis revealed that the inoculated pure cultures could be present during the whole operation, and others were closely related to bacteria being able to degrade hydrocarbons. The kinetic results demonstrated that the whole biofiltration for α-pinene was diffusion-limit controlled owing to its hydrophobic characteristics. These findings indicated that this bacterial biofiltration is a promising technology for the remediation of hydrophobic industrial waste gases containing ct-pinene.

关键词： biofilters gaseous α-pinene removal characteristics microbial community kinetic parameters

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

Conversion characteristics and mechanism analysis of gaseous dichloromethane degraded by a VUV light in different reaction media

引用

Journal of Environmental Sciences 2012年第10期24卷 1777-1784页

作者： Jianming Yu Wenji Cai Jianmeng Chen Li Feng yifeng jiang Zhuowei Cheng .College of Biological and Environmental Engineering Zhefiang University of Technology Hangzhou 310032 China Environmental Science and Engineering Research Institute Zhefiang University of Technology Hangzhou 310032 China

The photodegradation of gaseous dichloromethane （DCM） by a vacuum ultraviolet （VUV） light in a spiral reactor was investigated with different reaction media and initial concentrations. Through the combination of direct photolysis, O3 oxidation and HO. oxidation, DCM was ultimately mineralized into inorganic compounds （such as HC1, CO2, H20, etc.） in the air with relative humidity （RH） of 75%-85%. During the photodegradation process, some small organic acids （including formic acid, acetic acid） were also detected and the intermediates were more soluble than DCM, providing a possibility for its combination with subsequent biodegradation. Based on the detected intermediates and the confirmed radicals, a photodegradation pathway of DCM by VUV was proposed. With RH 75%- 80% air as the reaction medium, the DCM removal followed the second-order kinetic model at inlet concentration of 100-1000 mg/m3. Kinetic analysis showed that the reaction media affected the kinetic constants of DCM conversion by a large extent, and RH 80% air could cause a much lower half-life for its conversion. Such results supported the possibility that VUV photodegradation could be used not only for the mineralization of DCM but also as a pretreatment before biodegradation.

关键词： dichloromethane VUV photodegradation mechanism carbon balance kinetic analysis

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

人工多细胞体系研究进展

引用

应用与环境生物学报 2024年第1期30卷 197-204页

作者：江懿枫程龙胡智泉华中科技大学环境科学与工程学院武汉430074

人工多细胞体系具有可实现代谢分工、复杂底物利用等功能,已成为合成生物学发展的研究热点.概述人工多细胞体系的优势,介绍现阶段人工多细胞体系构建的方式及设计原则,通过文献对目前人工多细胞体系应用于环境修复的实例进行归纳汇总,... 详细信息

人工多细胞体系具有可实现代谢分工、复杂底物利用等功能,已成为合成生物学发展的研究热点.概述人工多细胞体系的优势,介绍现阶段人工多细胞体系构建的方式及设计原则,通过文献对目前人工多细胞体系应用于环境修复的实例进行归纳汇总,最后借助CiteSpace直观地分析人工多细胞的研究主题及趋势.与单一微生物相比,人工多细胞体系具有劳动分工更优化、代谢负担更低、底物转化能力更高、鲁棒性强等特点.目前主流的人工多细胞体系构建方式为自上而下法或是自下而上法,其设计原则一般是基于底盘细胞选择、种群控制策略、数值模拟预测等等.通过文献计量分析,人工多细胞的研究主题包含微型自主运动的发展以及生物电子传输等领域,然而随着“代谢工程”“人工智能”等词汇的突现,未来人工多细胞体系的研究会更加关注多细胞体系的设计与构建、细胞代谢途径、细胞间信息传递及相互作用等方面.结合现状及热点,提出未来人工多细胞体系的研究应关注:(1)解析人工多细胞体系成员之间相互作用机制与代谢方式;(2)根据人工多细胞体系的结构、行为与功能逐步优化构建方式;(3)开发基于人工多细胞体系的环境生物修复策略.

关键词：人工多细胞构建方式设计原则生物修复研究主题研究趋势

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

作战方案驱动的可学习兵棋推演智能体研究

引用

系统仿真学报 2024年第7期36卷 1525-1535页

作者：孙怡峰李智吴疆王玉宾战略支援部队信息工程大学河南郑州450001 中国人民解放军66389部队河南郑州450000

为了使智能体能够应对兵棋推演中的复杂作战场景和作战目的,提出作战方案驱动的可学习兵棋推演智能体架构。剖析智能体对兵棋系统的“依附特性”和“松耦合特性”,得到智能体的可学习要求;在智能体框架设计中,使用作战方案压减智能体学... 详细信息

为了使智能体能够应对兵棋推演中的复杂作战场景和作战目的,提出作战方案驱动的可学习兵棋推演智能体架构。剖析智能体对兵棋系统的“依附特性”和“松耦合特性”,得到智能体的可学习要求;在智能体框架设计中,使用作战方案压减智能体学习范围。通过有限状态机对应作战方案中的作战阶段知识,依据作战方案框架确定智能体决策空间,设计可学习的深层神经网络实施关键决策空间探索,神经网络采用先验知识模仿学习模式和深度强化学习模式。该架构能迭代探索人类难以充分梳理清楚的多棋子最优部署和协作问题。

关键词：兵棋推演智能体作战方案深层神经网络强化学习模仿学习

来源：

维普期刊数据库博看期刊

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

基于自然语言处理技术的微课程内容生成与自动化应用效果评估

引用

信息与电脑 2024年第2期36卷 251-253页

作者：江羿锋石河子市开放大学新疆石河子832000

传统的微课程制作过程烦琐且耗时,难以满足快速更新和个性化定制的需求,而自然语言处理(Natural Language Processing,NLP)技术为微课程内容生成与自动化应用提供了新的解决方案,并提出相应的效果评估指标,对其效果进行定量分析与评估。

关键词：自然语言处理(NLP) 微课程自动化应用

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

Recent progress of surface coating on cathode materials for high-performance lithium-ion batteries

引用

Journal of Energy Chemistry 2020年第4期29卷 220-235页

作者： Peiyuan Guan Lu Zhou Zhenlu Yu Yuandong Sun Yunjian Liu Feixiang Wu yifeng jiang Dewei Chu School of Materials Science and Engineering University of New South WalesSydney 2052Australia School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina College of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina

Lithium-ion batteries (LIB) have received substantial attention in the last 10 years,as they offer great promise as power sources that can lead to the electric vehicle (EV) revolution in the next 5 years.Since the cathode serves as a key component in LIB,its properties significantly affect the performance of the whole system.Recently,the cathode surface modification based on coating technique has been widely employed to enhance the electrochemical performances by improving the material conductivity,stabilising the physical structure of materials,as well as preventing the reactions between the electrode and electrolyte.In this work,we reviewed the present of a number of promising cathode materials for Li-ion batteries.After that,we summarized the very recent research progress focusing on the surface coating strategies,mainly including the coating materials,the coating technologies,as well as the corresponding working mechanisms for cathodes.At last,the challenges faced and future guidelines for optimizing cathode materials are discussed.In this study,we propose that the structure of cathode is a crucial factor during the selection of coating materials and technologies.

关键词： Lithium-ion battery Cathode Surface Coating Electrochemical performance

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

Effect of laser-discrete-quenching on bonding properties of electroplated grinding wheel with AISI 1045 steel substrate and nickel bond

引用

Chinese Journal of Aeronautics 2021年第6期34卷 79-89页

作者： Cong MAO Peihao CAI Yongle HU Yujie ZHONG Jishuang WEI Zhuming BI yifeng jiang Linfeng XIAO Mingjun ZHANG College of Automotive and Mechanical Engineering Changsha UniversityCollege of Automotive and Mechanical EngineeringChangsha University of Science and TechnologyChangsha 410114China Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China Department of Civil and Mechanical Engineering Purdue University Fort WayneFort WayneIN 46805USA

To improve the bonding strength between the nickel bond and the hub of the electroplated diamond grinding wheel,a hybrid technique was proposed to combine laser prequenching steel substrate and post-electroplating nickel.To validate the effectiveness of the proposed technique,AISI 1045 substrate was nickel-coated.The bonding properties between the electroplated nickel coating and substrate with or without laser-discrete-quenching were discussed comparatively by scratch,indentation,and thermal shock tests.The results show that the prequenching treatment leads to phase transformation of AISI 1045 microstructure from the mixed pearlite and ferrite phases into the martensitic phase.Since the martensitic phase is characterized as a high corrosion resistance,the interface of substrate/coating is smooth and flat in the prequenched zone,and the coating is bonded well with the steel substrate.In contrast to the steel substrate without pre-quenching treatment,the proposed technique significantly enhanced the bonding strengths of the electroplated nickel-coating.On one hand,the average hardness of electroplated nickel-coating on the laser pre-quenched zone is increased by 18.7%,and the scratch depth with the same load become narrower and shallower.On the other hand,the coefficient of friction(CoF)and the vibration amplitude are reduced,and the coating is bonded effectively with the substrate to inhibit the crack initialization at the interface.This prevents effectively the coating from peeling off and improves significantly the thermal shock resistance property.

关键词： Laser-discrete-quenching Bonding properties Electroplated grinding wheel AISI 1045 substrate Nickel coating

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：