期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到5篇文章
< 1 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Construction Solution for 3G Transmission Networkon Access Layer 认领 引用
1
作者 Pu Jian 《ZTE Communications》 2005年第3期27-29,共3页
The 3G network consists of the CoreNetwork(CN),UMTS Terres trial RadioAccess Network(UTRAN)and UserEqupment(UE).According to the metrotransms sion ne twork la yered struc ture,the 3Gtransms sion network s also divided... The 3G network consists of the CoreNetwork(CN),UMTS Terres trial RadioAccess Network(UTRAN)and UserEqupment(UE).According to the metrotransms sion ne twork la yered struc ture,the 3Gtransms sion network s also divided into theaccess layer,convergence hyer and core layerConstruction of 3G networks has become thehotte st topic in the telecom industry.Whatcharacteris tics do 3G services have? 展开更多
关键词 Access rate data UTRAN RNC Construction Solution for 3G Transmission Networkon Access Layer RPR
暂未订购 下载PDF
ON THE STABILITY OF FORCED DISSIPATIVE NONLINEAR SYSTEM 认领 引用
2
作者 陈达段 刘晓明 施惟慧 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1996年第6期541-548,共8页
This paper, applying the stratification theory, proves the instability of certain initial (boundary) Value problem of forced dissipative nonlinear system in atmospheric dynamies. An example in given.
关键词 construction of solution space. stralificalion. trivial layer
暂未订购 下载PDF
Dam foundation excavation techniques in China:A review 认领 引用 被引量：9
3
作者 Yuzhu Zhang Wenbo Lu +2 位作者 Ming Chen Peng Yan Yingguo Hu 《Journal of Rock Mechanics and Geotechnical Engineering》 EI CSCD 2013年第6期460-467,共8页
A protective layer(PL) is commonly reserved above foundation surface to protect the underlying rock mass during dam foundation excavation. In China, the PL of dam foundation is conventionally subdivided into two or th... A protective layer(PL) is commonly reserved above foundation surface to protect the underlying rock mass during dam foundation excavation. In China, the PL of dam foundation is conventionally subdivided into two or three thin layers and excavated with the shallow-hole blasting method, even by pneumatic pick method in case of soft rock mass. The aforementioned layered excavation of the PL delays the construction of the whole project. After nearly 30-year practices, several safe and effcient methods for the PL excavation of dam foundation are gradually developed. They include shallow-hole bench blasting with cushion material(SBC) at the bottom of the hole, and horizontal smooth blasting(HSB). The PL is even cancelled on the condition that horizontal pre-split technique is employed during dam foundation excavation. This paper introduces the aforementioned two PL excavation methods(shallow-hole blasting and bench blasting) and horizontal pre-split technique of dam foundation without protective layer(HPP). The basic principles of blasting method, blasting geometry, charge structure, drill-and-blast parameters of typical projects are examined. Meanwhile, the merits and limitations of each method are compared. Engineering practices in China show that HSB is basically the optimal method for dam foundation PL excavation in terms of foundation damage control and rapid construction. Some new problems for dam foundation PL excavation arising, such as strong unloading and relaxation phenomenon that encountered in the gorge region of southwest China, are needed to be addressed; and the corresponding countermeasures are discussed as well. 展开更多
关键词 Dam foundation Protective layer(PL) Excavation Blasting Rapid construction
暂未订购 下载PDF
Layer construction of topological crystalline insulator LaSbTe 认领 引用
4
作者 YuTing Qian ZhiYun Tan +5 位作者 Tan Zhang JiaCheng Gao ZhiJun Wang Zhong Fang Chen Fang HongMing Weng 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2020年第10期91-97,共7页
Topological crystalline insulator(TCI)is one of the symmetry-protected topological states.Any TCI can be deformed into a simple product state of several decoupled two-dimensional(2 D)topologically nontrivial layers in... Topological crystalline insulator(TCI)is one of the symmetry-protected topological states.Any TCI can be deformed into a simple product state of several decoupled two-dimensional(2 D)topologically nontrivial layers in its lattice respecting its crystalline symmetries called the layer construction(LC)limit.In this work,based on first-principles calculations we have revealed that both tetragonal LaSbTe(t-LaSbTe)and orthorhombic LaSbTe(o-LaSbTe)can be interpreted as stacking of 2 D topological insulators in each lattice space.The structural phase transition from t-LaSbTe to o-LaSbTe due to soft phonon modes demonstrates how the real space change can lead to the modification of topological states.Their symmetry-based indicators and topological invariants have been analyzed based on LC.We propose that LaSbTe is an ideal example demonstrating the LC paradigm,which bridges the crystal structures in real space to the band topology in momentum space. 展开更多
关键词 layer construction topological crystalline insulator topological insulator LaSbTe
暂未订购 下载PDF
Interlayer-expanded and defect-rich metal dichalcogenide(MX2)nanosheets for active and stable hydrogen evolution 认领 引用 被引量：2
5
作者 Jun Xu Yanyan Huang +5 位作者 Xialan Cheng Tong Liu Yingchun Lu Xing Chen Yu You Junjun Zhang 《Inorganic Chemistry Frontiers》 SCIE EI 2018年第12期3140-3147,共8页
Layered metal dichalcogenides(MX2)constructed from 2D covalently bonded monolayers are an exciting family as promising low-cost electrocatalysts towards the hydrogen evolution reaction(HER).Defect engineering of la... Layered metal dichalcogenides(MX2)constructed from 2D covalently bonded monolayers are an exciting family as promising low-cost electrocatalysts towards the hydrogen evolution reaction(HER).Defect engineering of layered lattices to fully utilize MX2nanosheets is highly desirable.Herein,we report a universal synthesis of defective MX2nanosheets by modulating both the basal planes and the interlayers.A series of basal plane-disordered and interlayer-expanded MX2(M=Mo,W,Sn;X=S,Se)nanosheets are synthesized.Interlayer spacings of the MX2nanosheets are significantly enlarged to 0.93-1.05 nm with an increase of 0.34-0.40 nm,owing to species intercalation.Abundant defects resulting from the wide interlayer expansion and the disordered basal planes offer extensive unsaturated chalcogen atoms as active sites for HER.Consequently,interlayer-expanded and defect-rich(IEDR)MX2catalysts exhibit striking activities,delivering small Tafel slopes,low onset overpotentials,large cathodic current densities and excellent long-term stabilities.Our work paves a new pathway to improve the electrocatalytic HER activity by defect modulation. 展开更多
关键词 covalently bonded monolayers modulating both basal planes defect rich hydrogen evolution layered metal dichalcogenides mx constructed hydrogen evolution reaction electrocatalyst interlayer expanded
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈