检索结果-南通市图书馆

Fractional full duplex cellular network: a stochastic geometry approach

Science China(Information Sciences) 2018年第2期61卷 50-64页

作者： Wenping bi Limin xiao Xin SU Shidong ZHOU State Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University

In-band full-duplex(FD) communication has been considered as a promising technology to enhance the spectral efficiency(SE) for the next generation of wireless system. However, the severe interference in FD cellular network may largely degrade the system performance, especially for cell edge users. In this paper, multi-cell cellular network consisting of BSs with FD capability and legacy half duplex(HD) users is studied. In order to relieve the received interference and enhance the system SE, a new resource allocation strategy named fractional FD(FFD) is proposed and its main idea and procedure are described as ***, the frequency and time resources are partitioned into FD resource blocks(RBs) and HD RBs based on the network topology. Then all the users are classified into two groups named cell center users(CCUs)and cell edge users(CEUs) based on their channel conditions. At last, in each cell, each FD RB is allocated to a pair of CCUs with one in uplink and the other in downlink transmission direction, while only one CEU in the uplink(or downlink) transmission direction is scheduled over each HD RB. Tractable results of both the coverage probabilities and the ergodic rates of FFD, FD and HD systems are derived using stochastic geometry method. Numerical results show that, FFD can significantly improve the coverage probability of all users especially for CEUs compared with FD cellular system, and higher system SE is obtained compared with FD and HD cellular network. With proper design of the classification criterion and under the simulation settings of this paper, the SE of FFD system outperforms FD and HD system by 1.25 and 1.38 times,respectively.

关键词： full duplex half duplex stochastic geometry radio resources allocation small cell

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Performance and Kinetics Studies on Selective Catalytic Reduction of NOx with NH_3 over MnO_x-WO_3/TiO_2 Catalyst

引用

Chemical Research in Chinese Universities 2010年第6期26卷 1002-1006页

作者： WU bi-jun xiao Ping LIU xiao-qin Guodian Science and Technology Research Institute Nanjing 210031 P R. China Chemical Engineering Institute Nanjing University of Technology Nanjing 210009 P. R. China

The catalytic activities of MnOx-WO3/TiO2 for selective catalytic reduction（SCR） of NO with NH3 were investigated in a wide range of temperature and reaction *** yielded a NOx conversion of 80.3%—99.6% and a N2 product selectivity of 100%—98.7% during 100 °C to 350 °C at gas hourly space velocity（GHSV）=18900 *** the presence of 0.01% SO2 and 6% H2O at 120 °C,the NOx conversion can maintain 98.5%.At 300 °C and with 0.07% SO2 in reactant stream,the NOx conversion stabilized at 99% as high as the commercial V-W/TiO2 catalyst＇s *** steady-state kinetics study shows that O2 played a promoting *** the presence of less than 1.5% O2,NOx conversion can increase sharply with the increase of O2 *** reaction order was zero with respect to NH3 and first with respect to NO with excess O2 and *** kinetics active energy（Ea） of Mn-W/TiO2 was calculated to be 6.24 kJ/mol according to the kinetic experiment at various temperatures,much lower than those of other catalysts reported in the ***-W/TiO2 is an excellent catalyst for SCR of NO with NH3 by now.

关键词： Selective catalytic reduction of NO with NH3 MnOx-WO3/TiO2 Performance Kinetics

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 in the study of Hedgehog signaling

引用

Journal of Genetics and Genomics 2008年第3期35卷 129-137页

作者： Gang Ma yue xiao Lin He bio-X Center Shanghai Jiao Tong University Shanghai 200030 China Institute for Nutritional Sciences Shanghai Institutes for Biological Sciences （SIBS） Chinese Academy of Sciences Shanghai 200031 China Institutes of biomedical Sciences Fudan University Shanghai 200032 China

The Hedgehog （Hh） family of secreted signaling proteins plays a critical role in regulating the development of several tissues and organ systems. The ability of Hh proteins to exert their biological effects is regulated by a series of post-translational processes. These processes include an intramolecular cleavage, covalent addition of cholesterol and/or palmitate, and conversion into a multimeric freely diffusible form. The processing of Hh proteins affects their trafficking, potency, and ability to signal over several cell diameters. Here we review the current understanding of the Hh signaling mechanisms that govern the establishment of the Hh gradient and the transduction of the Hh signal in the light of recent data.

关键词： Hedgehog processing signal transduction

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

Heteroscedastic regression analysis method for mixed data

引用

航空动力学报 2011年第4期26卷 721-726页

作者： FU Hui-min yue xiao-rui Research Center of Small Sample Technology Beijing University of Aeronautics and Astronautics Beijing 100191 China

The heteroscedastic regression model was established and the heteroscedastic regression analysis method was presented for mixed data composed of complete data,type-Ⅰ censored data and type-Ⅱ censored data from the location-scale *** best unbiased estimations of regression coefficients,as well as the confidence limits of the location parameter and scale parameter were ***,the point estimations and confidence limits of percentiles were ***,the traditional multiple regression analysis method which is only suitable to the complete data from normal distribution can be extended to the cases of heteroscedastic mixed data and the location-scale *** the presented method has a broad range of promising applications.

关键词： heteroscedastic regression analysis censored data performance test life prediction reliability 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

Numerical Investigation on the Harbour Resonance Inside A Harbour with Lateral Cavities

引用

China Ocean Engineering 2024年第5期38卷 838-844页

作者： YU yue-min HUANG xiao-hua School of Marine Science and Engineering Hainan UniversityHaikou 570228China Key Laboratory for Sustainable Utilization of Open-Sea Fishery Ministry of Agriculture and Rural AffairsGuangzhou 510300China South China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesGuangzhou 510300China

Wave-induced harbour resonance is numerically investigated inside a harbour with lateral *** theoretical solutions for the amplification parameter are compared with the simulated results under varying dimensionless wave numbers in order to verify the simulation model in a rectangular harbour at a constant *** results indicate that the numerical model can correctly calculate the natural frequency and the natural wave height.A range of calculations are performed for harbour resonance with one pair of lateral cavities,two pairs of lateral cavities and three pairs of lateral cavities,*** simulated results indicate that the amplitude of the amplification parameter decreases both at the primary natural oscillation and the secondary natural oscillation,as the number of lateral cavities *** dimensionless wave number reduces as the number of lateral cavities increases both at the primary natural oscillation and the secondary natural oscillation as well.

关键词： harbour resonance lateral cavity numerical simulation amplification parameter

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

An unexpected approach to enhance specific surface area and mesopore amount of polyaniline by Zn doping

引用

Rare Metals 2024年第9期43卷 4585-4594页

作者： Zhi-Da Zhu Yu-Zhe Han xiao-bi Jing School of Mechanical Engineering Yangzhou UniversityYangzhou 225127China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

Poly-p-anisidine could be easily fabricated via the oxidative polymerization reaction of p-anisidine using H_(2)O_(2)as the green *** was unexpectedly found that zinc doping could significantly improve the adsorption ability of the material versus heavy metals such as Pb,Cu,Pd,Ag and *** of nitrogen adsorption–desorption experiments demonstrated that Zn doping could enhance the specific surface area and mesopore amount of the prepared material,which might facilitate its absorption to *** work not only provides a novel material for the treatment of heavy metal-polluted water but also leads to a nice mesoporous catalyst support for environment protection and organic synthesis,*** Zn-doped poly-panisidine can be employed as the catalyst support to prepare Cu@PANI-OMe/Zn or Pd@PANI-OMe/Zn for the oxidative degradation reaction of phenol or Suzuki–Miyaura coupling reactions,*** discloses a new strategy for fabricating the mesoporous polyaniline materials with profound application potential.

关键词： Surfaces Porous materials Rare metal concentration Adsorption Catalysis

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

A New Benzosesquiterpenoid Dimer from Polyalthia cheliensis Hu

引用

Chinese Chemical Letters 2001年第7期12卷 617-618页

作者： Wei Ming ZHU Xin HONG yue Mao SHEN bi Tao ZHAO Hong Ping HE xiao Jiang HAO Laboratory of Phytochemistry Kunming Institute of BotanyChinese Academy of SciencesKunming 650204 Department of Chemistry Yunnan Normal UniversiteKunming 650092

A new benzosesquiterpenoid dimer, 3 ' ,3 ' ' ' -bispolycerasoidol (1), along with its monomer, polycerasoidol, were isolated from the dried leaves of Polyalthia cheliensis Hu. The structure of 1 was established by spe... 详细信息

关键词： Polyalthia cheliensis Annonaceae bispolycerasoidol benzosesquiterpenoid

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

The microstructure of a single crystal superalloy after different aging heat treatments

引用

Rare Metals 2018年第3期37卷 210-216页

作者： xiao-Dai yue Jia-Rong Li xiao-Guang Wang Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

To study the influence of aging heat treatments on the microstructure of single crystal superalloys with high content of refractory elements and optimal the aging heat treatment regimes, a single crystal superalloy containing 22 wt% refractory elements was *** show that for the experimental alloy, even the homogenization-solution heat treatment for 25 h cannot homogenize the alloying elements completely. During primary aging heat treatment, γ＇ phase grows larger and turns to regular cubes. Higher aging temperature induces larger γ＇ cubes. For specimens with primary aging heat treated at 1120 ℃,γ＇ morphology does not change apparently during secondary aging heat treatment. For specimens with primary aging heat treatment at 1150 ℃,γ＇phase in interdendrite grows obviously comparing with that in dendrites. By analyzing the precipitating kinetics of γ＇phase, it is found that owning to the dendrite segregation and different aging heat treatment temperatures, γ＇ phase at different regions grows under the control of different factors at different aging heat treatment stages. The two controlling factors that are driving forces of phase transformation and element diffusion rate induce obviously different growth rates of γ＇ phase. As a result, the γ＇-precipitating behaviors are variable based on different solute concentrations and aging temperatures. For advanced single crystal superalloys that are supposed to be used at relatively high temperatures, the final γ＇ size after aging heat treatment is suggested to be close to the crossing point of diffusion controlling curve and driving force controlling curve corresponding to the serving temperature. And then,high-temperature properties can be improved.

关键词： Single crystal superalloy Aging heat treatment γ' precipitation Kinetics

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

bioinspired and biomimetic membranes for water purification and chemical separation: A review

引用

Frontiers of Environmental Science & Engineering 2021年第6期15卷 141-173页

作者： Elham Abaie Limeimei Xu yue-xiao Shen Department of Construction Civil and Environmental EngineeringTexas Tech UniversityLubbockTX 79409USA

bioinspired and biomimetic membranes that contain biological transport channels or attain their structural designs from biological systems have been through a remarkable development over the last two *** take advantage of the exceptional transport properties of those channels,thus possess both high permeability and selectivity,and have emerged as a promising solution to existing *** the discovery of biological water channel proteins aquaporins(AQPs),extensive efforts have been made to utilize them to make separation membranes–AQP-based membranes,which have been *** exploration of AQPs’unique structures and transport properties has resulted in the evolution of biomimetic separation materials from protein-based to artificial channelbased ***,large-scale,defect-free biomimetic membranes are not available *** paper reviews the state-of-the-art biomimetic membranes and summarizes the latest research progress,platform,and *** it critically discusses the potential routes of this emerging area toward scalable *** conclude that an appropriate combination of bioinspired concepts and molecular engineering with mature polymer industry may lead to scalable polymeric membranes with intrinsic selective channels,which will gain the merit of both desired selectivity and scalability.

关键词： Aquaporins Artificial water channels biomimetic membranes Chemical separation and water purification

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

慢性HBV感染者病原学特点与肝损害、肾损害的相关性研究

引用

湖南中医药大学学报 2010年第5期30卷 45-47页

作者：赵国荣张柏盛陈锡军谢静陈兰玲熊焰王天明肖碧跃艾碧琛何宜荣湖南中医药大学湖南长沙410007

目的探讨慢性HBV感染者病原学特点及其与肝损害、肾损害的相关性。方法根据慢性HBV感染者的病原学特点及有无肝损害情况,将282例慢性HBV感染者分为6组,观察其各项实验室指标的情况。结果双抗原阳性患者发生肝损害的例数多于单抗原阳性患... 详细信息

目的探讨慢性HBV感染者病原学特点及其与肝损害、肾损害的相关性。方法根据慢性HBV感染者的病原学特点及有无肝损害情况,将282例慢性HBV感染者分为6组,观察其各项实验室指标的情况。结果双抗原阳性患者发生肝损害的例数多于单抗原阳性患者,差异有统计学意义(P18岁患者,差异有统计学意义(P<0.01);有肝损害患者发生肾损害的例数明显多于无肝损害患者,差异有统计学意义(P<0.01)。结论慢性HBV感染者是否发生肝损害与病原学特点及有无合并症有相关性,是否发生肾损害与年龄因素及有无肝损害有相关性。

关键词：慢性HBV感染肝损害肾损害

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：