检索结果-南通市图书馆

硫酸金刚烷胺与盐酸金刚烷胺对流感病毒的作用比较

在线全文

学校读者我要写书评

暂无评论

齐鲁药事 2004年第6期23卷 44-45页

作者：唐明月张艳中国药科大学生理教研室南京210009 安徽医科大学药理教研室合肥230032

目的　比较金刚烷胺硫酸盐和盐酸盐体外对流感病毒的抑制作用。方法　采用MDCK细胞 ,测定金刚烷胺 2种盐的半数中毒浓度 (TD50 )和抑制流感病毒A3 的半数有效浓度 (IC50 )。结果　硫酸金刚烷胺和盐酸金刚烷胺对流感病毒A3的TD50 分别为 ... 详细信息

目的　比较金刚烷胺硫酸盐和盐酸盐体外对流感病毒的抑制作用。方法　采用MDCK细胞 ,测定金刚烷胺 2种盐的半数中毒浓度 (TD50 )和抑制流感病毒A3 的半数有效浓度 (IC50 )。结果　硫酸金刚烷胺和盐酸金刚烷胺对流感病毒A3的TD50 分别为 0 390± 0 0 85 μM·ml-1和 0 188± 0 0 4 2 μM·ml-1,IC50 分别为 0 0 4 8± 0 0 12 μM·ml-1和 0 0 5 6± 0 0 0 4 μM·ml-1。结论　硫酸金刚烷胺与盐酸金刚烷胺在体外对流感病毒A3

关键词：硫酸金刚烷胺盐酸金刚烷胺流感病毒A3抑制作用

Interference management with adaptive fractional frequency reuse for LTE-A femtocells networks

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2013年第2期20卷 86-91页

作者： zhang Wei-dong WANG Ying XU ming-yue zhang Ping Wireless Technology Innovation Institute Beijing University of Posts and Telecommunications

This paper presents a novel interference management strategy, to adaptively choose the best fractional frequency reuse （FFR） scheme for macro and femto networks. The strategy aims to maximize the system throughput taking into account a number of system constraints. Here, the system constrains consist of the outage constraints of two-tier users and macrocell spectral efficiency requirement. The detailed procedures of our proposed strategy are： 1） A reference signal received power （RSRP） based selection algorithm is presented to adaptively select the optional FFR schemes satisfying the outage constraints. 2） Considering the macrocell spectral efficiency, the optimal FFR scheme is selected from the optional FFR schemes at MeNB side, to achieve the maximum system throughput in two-tier femtocell networks. We study the efficacy of the proposed strategy using an long term evolution advanced （LTE-A） system level simulator. Simulation results show that our proposed interference management strategy can select the best FFR scheme to maximize the system throughput, and the FFR schemes derived by using RSRP-based selection algorithm can be the effective solutions to deploy femtocells in macrocells.

关键词： femtocell FFR outage probability spectral efficiency RSRP

Dynamic prediction of landslide displacement using singular spectrum analysis and stack long short-term memory network

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2021年第10期18卷 2597-2611页

作者： LI Li-min zhang ming-yue WEN Zong-zhou College of Electronics and Information Xi’an Polytechnic UniversityXi’an 710048China

An accurate landslide displacement prediction is an important part of landslide warning system. Aiming at the dynamic characteristics of landslide evolution and the shortcomings of traditional static prediction models, this paper proposes a dynamic prediction model of landslide displacement based on singular spectrum analysis(SSA) and stack long short-term memory(SLSTM) network. The SSA is used to decompose the landslide accumulated displacement time series data into trend term and periodic term displacement subsequences. A cubic polynomial function is used to predict the trend term displacement subsequence, and the SLSTM neural network is used to predict the periodic term displacement subsequence. At the same time, the Bayesian optimization algorithm is used to determine that the SLSTM network input sequence length is 12 and the number of hidden layer nodes is 18. The SLSTM network is updated by adding predicted values to the training set to achieve dynamic displacement prediction. Finally, the accumulated landslide displacement is obtained by superimposing the predicted value of each displacement subsequence. The proposed model was verified on the Xintan landslide in Hubei Province, China. The results show that when predicting the displacement of the periodic term, the SLSTM network has higher prediction accuracy than the support vector machine(SVM) and auto regressive integrated moving average(ARIMA). The mean relative error(MRE) is reduced by 4.099% and 3.548% respectively, while the root mean square error(RMSE) is reduced by 5.830 mm and 3.854 mm respectively. It is concluded that the SLSTM network model can better simulate the dynamic characteristics of landslides.

关键词： Landslide Singular spectrum analysis Stack long short-term memory network Dynamic displacement prediction

Numerical simulation of single roller melt spinning for NdFeB alloy based on finite element method

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2020年第10期39卷 1145-1150页

作者： Xu-Chao Wang ming yue Dong-Tao zhang Wei-Qiang Liu ming-Gang Zhu College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124.China Central Iron and Steel Research Institute Beijing 100081China

The numerical simulation model of single roller melt spinning for rapid quenching process of NdFeB alloy was built,and the vacuum chamber,cooling roller and sample were taken into account as a *** existing mature technology was in order to verify the correctness of *** rapid quenching ribbons with different roll speeds were used as the simulation *** results of the numerical simulation and experiments show that the validity of the model has been testified and the reasons of the formation of complete quenching ribbons and by-product have been *** experimental thickness of the ribbons is proportional to the theoretical *** the same spray condition,with the roll speed increasing,the thickness decreases *** the speed range of25-30 m·s^(-1),the simulated calculation date is close to the experimental date,which can be considered as an ideal technological parameter.

关键词： NdFeB Melt spinning Finite element method Numerical simulation

Projects Funded by the Division of Botany （NSFC） in 2005： Retrospect and Prospect

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2005年第12期47卷 1516-1527页

作者： ming-zhang WEN yue CHEN Qin-Li WANG Sheng-ming DU Department of Life Sciences National Natural Science Foundation of China Beijing 100083 China Institute of Botany the Chinese Academy of Sciences Beijing 100093 China

The present paper briefly introduces information about proposals received and funded, statistics and analysis of evaluation of peer review, and supporting strategies and reforms in program reviewing and administration in the Division of Botany at the Natural Science Foundation of China （NSFC） in 2005. A list of general programs and the abstract of key programs funded by this Division in 2005 are also provided.

关键词： Division of Botany fund project review.

Ti_(3)C_(2)T_(x)/SnO_(2)P–N heterostructure construction boosts room-temperature detecting formaldehyde

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

Rare Metals 2024年第1期43卷 267-279页

作者： yue zhang ming-yue Wang Xiao-Guang San Yan-Bai Shen Guo-Sheng Wang Lei zhang Dan Meng College of Chemical Engineering Shenyang University of Chemical TechnologyShenyang 110142China Institute for Superconducting and Electronic Materials(ISEM) Australian Institute for Innovative Materials(AIIM)University ofWollongongWollongongNSW2500Australia College of Resources and Civil Engineering Northeastern UniversityShenyang 110819China

Formaldehyde is a common atmospheric pollutant produced in industrial production and daily ***,the traditional semiconductor formaldehyde gas sensor cannot work at room temperature,which limits its practical ***,developing high-performance gas sensors for rapidly and accurately detecting formaldehyde at room temperature is an important *** this study,Ti_(3)C_(2)Tx/SnO_(2)heterostructures were constructed,which could selectively detect formaldehyde at room temperature with a response value of 29.16%(10×10^(-6)).In addition,the sensor shows a remarkable theoretical detection limit of 5.09×10^(-9)and good longterm *** functional theory(DFT)simulations reveal that SnO_(2)nano spheres provide the majority of adsorption sites that strongly interact with ***,Ti_(3)C_(2)T_(x)acting as a conductive layer facilitates the transfer of charge carriers so that they show a sensing response to formaldehyde at room ***,the formation of p-n heterostructures between SnO_(2)and Ti_(3)C_(2)T_(x)boosts the Schottky barrier at the interface,which is the critical factor in enhancing the sensing properties by turning the Schottky barrier upon introducing formaldehyde *** perspective is expected to provide instructive guidance for utilizing MXene/metal oxide nanocomposites to improve the gas sensing performance at room temperature.

关键词： Ti_(3)C_(2)T_(x)/SnO_(2)nanocomposites p-n heterostructures Formaldehyde sensing Room temperature DFT calculations

Modelling and numerical simulation of isothermal oxidation of an individual magnetite pellet based on computational fluid dynamics

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2021年第7期28卷 799-808页

作者： Zhou Pu Feng Zhou yue Sun ming zhang Bo-quan Li Department of Instrumentation Science and Technology Jiangsu UniversityZhenjiang 212013JiangsuChina

A mathematical model based on the computational fluid dynamics method,heat and mass transfer in porous media and the unreacted shrinking core model for the oxidation reaction of an individual magnetite pellet during preheating was *** commercial software COMSOL Multiphysics was used to simulate the change in the oxidation degree of the pellet at different temperatures and oxygen concentrations,and the simulated results were compared with the exper-imental *** model considered the influence of the exothermic heat of the reaction,and the enthalpy change was added to calculate the heat released by the *** results show that the oxidation rate on the surface of the pellet is much faster than that of the inside of the *** and oxygen concentration have great influence on the pellet oxidation ***,the exothermic calculation results show that there is a non-isothermal phenomenon inside the pellet,which leads to an increase in temperature inside the single *** the preheating condition of 873-1273 K(20%oxygen content),the heat released by the pellet oxidation reaction in a chain grate is 7.8×10^(6)-10.8×10^(6) kJ/h,which is very large and needs to be considered in the magnetite pellet oxidation modelling.

关键词： Magnetite pellet Oxidation Numerical simulation Unreacted shrinking core model Computational fluid dynamics

Cosmological evolution of quintessence with a sign-changing interaction in dark sector

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) 2014年第9期57卷 1805-1808页

作者： zhang ming SUN ChengYi YANG ZhanYing yue RuiHong Department of Physics Northwest University Institute of Modern Physics Northwest University Faculty of Science Ningbo University

Dark energy and dark matter are only indirectly measured though their gravitational *** is possibie that there is some direct,non-gravitational interaction between DE and DM,which can be used to solve(or,at least alleviate)several important theoretical *** the present work,by analysing the cosmological dynamical system with a dark-sector interaction which changes its sign during the cosmological evolution,we find a scaling attractor to help to alleviate the cosmic-coincidence *** result shows that this interaction can bring new features to the cosmology.

关键词： cosmological evolution scaling attractor dark sector quintessence

Magneto-Caloric Effect of Gd5Si2Ge2Compounds under Different Processing Conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2004年第Z1期22卷 76-78页

作者： Zeng Hong yue ming Niu Peili zhang Jiuxing Key Laboratory of Advanced Functional Materials Ministry of Education Beijing University of TechnologyBeijing 100022 China

The magneto-caloric effect of Gd5 Si2Ge2 compounds produced by various techniques is investigated in terms of their magnetization behaviors in the magnetic field from 0 to 2.0 *** studied materials include arc-melted, annealed and sintered *** results demonstrate that the Gd5Si2Ge2 alloys obtained under different processing conditions possess distinct magneto-caloric effect due to their various *** annealing treatment can enhance the magneto-caloric effect of the alloy *** the sintered alloy bears relatively lower value of magnetic entropy change ( △ SM) than arc-melted *** magnetic entropy change of the annealed Gd5 Si2Ge2 alloy arrives the arrives the maximum value of - △SM = 15.29 J· kg-1· K-1 for magnetic field change under 2.0 T in the present work.

关键词： magneto-caloric effect processing conditions Gd5Si2Ge2 magnetic entropy change