检索结果-南通市图书馆

Double [5]carbohelicene: facile synthesis, chiroptical properties,isomerization study, and lasing application

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 233-240页

作者： Peipei Liu yantong Li Meng-Xiang Wu Hao Kang Xiao-Li Zhao lin Xu linlin Liu Xiaodong Li Junfeng Fang Zhiwei Fang ya Cheng Hai-Bo yang Huakang Yu Xueliang Shi State Key Laboratory of Petroleum Molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular Engineering East China Normal University School of Physics and Optoelectronics South China University of Technology Institute of Polymer Optoelectronic Materials & Devices State Key Laboratory of Luminescent Materials & Devices South China University of Technology School of Physics and Electronic Science Engineering Research Center of Nanophotonics & Advanced Instrument Ministry of EducationEast China Normal University State Key Laboratory of Precision Spectroscopy School of Physics and Electronic Science East China Normal University

Double carbohelicenes have attracted considerable attention due to their aesthetic structures, distinct π-conjugation extension, inherent chirality, and intriguing optical and electronic properties. Herein, the concise de novo synthesis of a new double[5]carbohelicene 1 together with its chiroptical properties, isomerization process and lasing application is presented. 1 was synthesized by a simple protocol involving the formation of a 6,6′-bipentacene as the key intermediate. It is worth noting that1 existed as two diastereomers 1-PP/MM and 1-PM, which were successfully isolated and unambiguously confirmed by Xray crystallography. The optical resolution of the racemic 1-PP/MM was successfully achieved by chiral-phase highperformance liquid chromatography（HPLC）, and 1-PP and 1-MM were characterized by circular dichroism. Interestingly, it was found that 1-PP/MM could be completely isomerized to 1-PM upon heating, and the detailed thermodynamics and kinetics of the isomerization process were systematically investigated. 1-PM exhibited deep-red luminescence with emission maximum at 723 nm and fluorescence quantum yield as high as 32.95%. Consequently, we can showcase the lasing application of 1-PM by doping with epoxy resin to assemble a bottle microlaser spontaneously, which the lasing wavelength is 796.6 nm at a threshold of 0.8 m J cm-2. We believe that our studies, including the facile synthesis methodology, detailed isomerization studies, and lasing application, will shed some light on the design and synthesis of novel carbohelical systems with more functions.

关键词： double carbohelicene optical resolution organic laser isomerization X-ray diffraction

Strong Interaction Effect on Jet Energy Loss with Detailed Balance

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2017年第10期34卷 18-22页

作者： Jing-ya Zhang luan Cheng School of Physics Dalian University of Technology Dalian 116024

The strong force effect on gluon distribution of quark-gluon plasma and its influence on jet energy loss with detailed balance are studied. We solve the possibility equation and obtain the value of non-extensive parameter q. In the presence of strong interaction, more gluons stay at low-energy state than the free gluon case. The strong interaction effect is found to be important for jet energy loss with detailed balance at intermediate jet energy. The energy gain via absorption increases with the strong interaction. This will affect the nuclear modification factor RAA and the parameter of q at intermediate jet energy.

关键词： Strong Interaction Effect on Jet Energy Loss with Detailed Balance QCD

Plasticity and melting characteristics of metal Al with Ti-cluster under shock loading

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第7期30卷 200-208页

作者： Dong-lin luan ya-Bin Wang Guo-Meng Li Lei Yuan Jun Chen School of Mechatronic Engineering Beijing Institute of TechnologyBeijing 100081China System Engineering Research Institute Beijing 100094China Beijing Special Vehicle Research Institute Beijing 100072China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Center for Applied Physics and Technology Peking UniversityBeijing 100871China

Impurity agglomeration has a significant influence on shock response of metal *** this paper,the mechanism of Ti-clusters in metal Al under shock loading is investigated by non-equilibrium molecular dynamics *** results show that the Ti-cluster has obvious effects on the dislocation initiation and melting of bulk ***,the Ti clusters induces the strain concentrate and leads the dislocations to be initiated from the interface of Ti ***,dislocation distribution from the Ti-cluster model results in a formation of a grid-like structure,while the dislocation density is reduced compared with that from the perfect Al ***,the critical shock velocity of dislocation from the Ti-cluster model is lower than from perfect Al ***,it is also found that the temperature near the interface of Ti-cluster is100 K–150 K higher than in the other areas,which means that Ti-cluster interface melts earlier than the bulk area.

关键词： molecular dynamics impurity cluster dislocation shock loading

Enhanced removal of antibiotic resistance genes during chicken manure composting after combined inoculation of Bacillus subtilis with biochar

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第1期135卷 274-284页

作者： Zewen Wu luan Zhang Hao lin Shungui Zhou Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China School of Environmental Science and Engineering Hubei Key Laboratory of Mine Environmental Pollution Control and RemediationHubei Polytechnic UniversityHuangshi 435003China Fujian Provincial Key Laboratory of Eco-Industrial Green Technology Wuyi UniversityWuyishan 354300China

This study explored the combined effects of Bacillus subtilis inoculation with biochar on the evolution of bacterial communities,antibiotic resistance genes(ARGs),and mobile genetic elements(MGEs)during the composting of chicken *** results showed that *** inoculation combined with biochar increased bacterial abundance and diversity as well as prolonged the compost thermophilic *** organic matter biodegradation and facilitated the organic waste compost humification process,reduced the proliferation of ARGs by altering the bacterial *** and Actinobacteriota were the main resistant bacteria related to ARGs and *** decrease in ARGs and MGEs was associated with the reduction in the abundance of related host *** inoculation with *** and the addition of biochar could promote nutrient transformation,reduce the increase in ARGs and MGEs,and increase the abundance of beneficial soil taxa.

关键词： Antibiotic resistance gene Bacillus subtilis Bacterial community Biochar Composting

Research of Boiler Combustion Regulation for Reducing NOx Emission and its Effect on Boiler Efficiency

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2007年第3期16卷 270-276页

作者： WANG Xue-dong luan Tao CHENG lin XIAO Kun Shandong University Jinan 250061 Shandong Electric Research Institute Jinan 250002

The effect of boiler combustion regulation on NOx emission of two 1025t/h boilers has been studied. The researches show that NOx emission is influenced by coal species, operation conditions, etc, and can be reduced by regulating the combustion conditions. The effect of combustion regulation on boiler efficiency has also been checked.

关键词： boiler thermal efficiency nitric oxides combustion regulation NOx emission

大比例浅水矩形水箱振动台试验研究及TLD等效线性化分析

在线全文

学校读者我要写书评

暂无评论

Numerical investigation of non-cohesive seabed response around a mono-pile by crossing wave-current

工程力学 2025年第1期42卷 143-151页

作者：肖从真巫振弘陈凯唐意严亚林中国建筑科学研究院有限公司北京100013 国家建筑工程技术研究中心北京100013

调谐液体阻尼器(TLD)是高层建筑减振的有效措施。该文进行了大比例浅水矩形水箱振动台试验研究，分析了将调谐液体阻尼器按等效线性化等效为单自由度系统的可行性。采用振动台试验得到目标水箱在0.6倍~1.4倍水体自振频率简谐激励荷载下... 详细信息

调谐液体阻尼器(TLD)是高层建筑减振的有效措施。该文进行了大比例浅水矩形水箱振动台试验研究，分析了将调谐液体阻尼器按等效线性化等效为单自由度系统的可行性。采用振动台试验得到目标水箱在0.6倍~1.4倍水体自振频率简谐激励荷载下，水体稳态振动时的水箱反力和频响函数;测量不同振动幅度下，水体的自振频率偏差;由水体自由振动衰减，测得5种不同网栅条件下的附加阻尼比;将风和地震荷载下某249 m高楼顶加速度作为水箱激励进行振动台混合试验，实测水箱反力和滞回曲线，并与等效线性化模型计算结果进行对比。结果表明，以最大变形割线刚度作为等效刚度、按等能量方法确定阻尼比的等效线性化模型基本可行，在简谐波和风荷载作用下较符合试验结果，在地震荷载下存在一定偏差。试验结果可为类似调谐液体阻尼器设计提供依据。

关键词：高层结构调谐液体阻尼器振动台试验附加阻尼比浅水水箱等效线性化

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Water Science and Engineering 2022年第1期15卷 57-68页

作者： Jie lin ya-kun Guo Xiamen Ocean Vocational College Xiamen 361012China Key Laboratory of Coastal Disaster and Defence of Ministry of Education Hohai UniversityNanjing 210098China Faculty of Engineering&Informatics University of BradfordBradford BD71DPUK

The interaction between waves and currents in the ocean often complicates the flow field around *** this study,a three-dimensional integrated numerical model was established to investigate the seabed response and liquefaction around a mono-pile under different wave-current interaction *** the present model,the Reynolds-averaged Navier-Stokes equations were used to simulate the flow field,and the Biot's poro-elastic theory was adopted to calculate the seabed response caused by crossing wave-current *** previous studies,the load on the mono-pile was considered,and the wave-current interaction angle was extended to 180°,which was more in line with practical engineering *** numerical results were in a good agreement with the experimental *** results indicated that waves interacted with currents in a large angle could result in a large momentary liquefaction depth of the *** parametric studies proved that the position of the front and two sides of the pile was relatively safer compared with that of the leeside of the pile,and the surface of the seabed downstream of the pile was liable to liquefy.

关键词： Wave-current interaction Mono-pile Seabed response Liquefaction Wave-current model Seabed model

Gravitational-wave equation in effective one-body background for spinless binary

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

Science China(Physics,Mechanics & Astronomy) 2023年第7期66卷 29-37页

作者： ya Guo Hiroaki Nakajima Wenbin lin School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of Mathematics and Physics University of South ChinaHengyang 421001China

The effective one-body method provides a framework to apply the black hole perturbation theory to the binary system where two masses can be *** study the gravitational-wave equation in the background of the effective one-body system for the spinless binary,which is in general available with the spherically symmetric background as *** obtain the gauge conditions for the decoupled wave equation,and also give the solutions to the gauge conditions in terms of the metric perturbation for a special case,which extends the result by Jing et al.(***.65,260411(2022)).Finally we obtain the gravitational-wave equation which is the generalization of the Teukolsky equation.

关键词： gravitational-wave equation Teukolsky equation effective one-body system Newman-Penrose formalism

同方期刊数据库

Self-healing Supramolecular Polymer Composites by Hydrogen Bonding Interactions between Hyperbranched Polymer and Graphene Oxide

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2018年第5期36卷 584-591页

作者： Yi-Gang luan Xiao-A Zhang Sheng-ling Jiang Jian-Huan Chen ya-Fei Lyu Key Laboratory of Carbon Fiber and Functional Polymers of Ministry of Education College of Materials Science and Engineering Beijing University of Chemical Technology

A self-healing supramolecular polymer composite（HSP-GO） was designed and prepared via incorporation of modified graphene oxide to hyperbranched polymer by hydrogen-bonding interactions. The polymer matrix based on amino-terminated hyperbranched polymer（HSP-NH_2） was synthesized by carboxylation, Curtius rearrangement, and amination of hydroxyl-terminated hyperbranched polyester（HP-OH）, while the modified graphene oxide was prepared by transformation of hydroxyl to isocyanate and further to carbamate ester. Spectroscopic methods were utilized to characterize the obtained polymer composites. Stress-strain test was selected to carefully study the self-healing property of HSP-GO. It is found that a small amount of modified graphene oxide（up to 2 wt%） improves the glass transition temperature（T_g）, tensile strength, Young＇s modulus, and self-healing efficiency of the polymer composites. After healed at room temperature for 10 min, the addition of modified graphene oxide improves the self-healing efficiency to 37% of its original tensile strength. The experiment result shows that the self-healing efficiency is related to the density of hydrogen bonding site and the molecular movement.

关键词： Self-healing Supramolecular polymer Graphene oxide Hydrogen bonding