检索结果-南通市图书馆

Description of Superdeformed Triaxial Band in ^(163)Lu

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第3期15卷 170-172页

作者： xing zheng WANG Zi-xing CHEN xing-qu Department of Modern Physics Lanzhou UniversityLanzhou 730000 Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800

Using triaxial-particle-rotor model,theγ-transition energies,kinematic and dynamic moments of inertia and the transition quadrupole moments forπ[6601/2]band in ^(163)Lu are calculated and compared with the observed ... 详细信息

关键词： moments inertia

Configuration Assignment of Superdeformed Bands in Odd-A Hg nuclei

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese journal of nuclear physics 1994年第2期16卷 133-138页

作者： Chen, xingqu xing, zheng Lanzhou Univ Lanzhou China

-By using particle-rotor model,the configuration of the superderformed(SD)bands in odd-A Hg nuclei is *** is shown that the electromagnetic transitionproperties of the SD bands can be used to further identify the conf... 详细信息

关键词： Nuclear structure Superdeformed bands Particle-rotor model Configuration assignment

A Robust on-Wafer Large Signal Transistor Characterization Method at mm-Wave Frequency

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2019年第4期28卷 871-877页

作者： SU Jiangtao CAI Jialin zheng xing SUN Lingling Key Laboratory of RF Circuits and Systems Ministry of Education

Accurate on-wafer large signal characterization of RF transistor is crucial for the optimum design of wireless communication circuits. We report a novel and systematic measurement method for the accurate acquisition of input and output power of on-wafer transistors up to 40 GHz. This method employs external couplers to extract the travelling waves, combined with a novel large signal calibration algorithm to calculate the power at on-wafer probe tip. The accuracy of this method was bench marked versus conventional approaches in a real measurement bench, and further been verified by characterizing the large signal response of a 0.25μm GaN HEMT device. It is concluded that the measurement uncertainty has been greatly decreased with this new method, especially at mm-wave frequencies.

关键词： Calibration Nonlinear measurement RF power amplifier mm-wave band On-wafer test

A Fast Two-Tone Active Load-Pull Algorithm for Assessing the Non-linearity of RF Devices

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 Journal of Electronics 2022年第1期31卷 25-32页

作者： SU Jiangtao CAI Jialing zheng xing SUN Lingling Key Laboratory of RF Circuits and Systems Ministry of Education Key Laboratory of Large Scale Integrated Circuits Design Zhejiang Province

Radio frequency(RF) devices used in modern wireless systems must meet increasingly complicated spectral constraints while still operating with high power efficiency. A fast real-time two-tone active loadpull algorithm is proposed to assess the relationship between nonlinear performance with associated device load impedance variations. This algorithm employs real time measurement data to extract two-tone local nonlinear behaviour model, which is further used for the prediction of injected signal value in the active real-time loadpull system, therefore minimizing the number of iterations required for load emulation. The proposed method was validated on a real two-tone load-pull measurement bench using off-the-shelf instruments. The result shows that the measurement speed has been greatly increased without sacrifice of the impedance emulation *** intelligent two-tone load-pull algorithm is expected to be applied in the designing of modern communication system and radar transmitters, as well as the validation of the models of radio frequency transistors.

关键词： measurement speed real-time load-pull system spectral constraints radio frequency transistors real time measurement data intelligent two-tone load-pull algorithm two-tone local nonlinear behaviour model radio frequency devices impedance emulation accuracy modern communication system modern wireless systems nonlinearity radiocommunication RF devices associated device load impedance variations radar transmitters injected signal value two-tone load-pull measurement bench load emulation high power efficiency fast real-time two-tone active load-pull algorithm nonlinear performance

Coleman Automorphisms of Holomorphs of Finite Abelian Groups

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第9期30卷 1549-1554页

作者： zheng xing LI Jin Ke HAI College of Mathematics Qingdao University

Let K be a finite abelian group and let H be the holomorph of K. It is shown that every Coleman automorphism of H is an inner automorphism. As an immediate consequence of this result, it is obtained that the normalize... 详细信息

关键词： Coleman automorphism integral group ring the normalizer property

A new scheme for identifying free surface particles in improved SPH

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1454-1463页

作者： zheng xing DUAN WenYang MA QingWei College o(Shipbuilding Engineering Harbin Engineering University Harbin 150001 China Schools of Engineering and Mathematical Science City University London EC1 V OHB UK

The present paper proposes a new scheme for identifying free surface particles in an improved SPH (Smoothed Particle Hydrodynamics). With the development of the SPH, free surface identification becomes a key challenge in free surface flow simulations, especially for violent breaking water waves. According to numerical tests, existing free surface identified schemes are not reliable for weakly compressible SPH when violent waves are modeled. The new free surface identification scheme suggested here considers changes in density ratio and three auxiliary functions. Although this new scheme originates from a scheme for another meshfree method (MLPG_R method), it includes several improvements, especially developed for the improved SPH. The limited numerical tests have indicated that the scheme does not significantly increase CPU time required, but it considerably improves the identification of free surface particles.

关键词： meshfree method SPH free surface identification scheme improved SPH

Healthy and low-carbon communities: Design, optimization, and new technologies

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2023年第9期16卷 1583-1585页

作者： Jianlin Liu xing zheng Yixing Chen College of Environmental Science and Engineering Donghua UniversityChina Future Cities Lab Global Singapore-ETH CentreSingapore College of Civil Engineering Hunan UniversityChina

As the world grapples with the challenges of global warming,the urban heat island(UHI)effect,urban air pollution,and the imperative to transition towards low-carbon economies,the role of communities in fostering sustainability and innovation becomes more critical than *** example,the frequent occurrences of air pollution and extreme weather conditions have seriously threatened residents’health and property *** global warming and urban heat island effect bring challenges to the climate resilience of *** has accelerated the growth of building stock and urban energy consumption.

关键词： pollution island warming

Coleman Automorphisms of Generalized Dihedral Groups

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2016年第2期32卷 251-257页

作者： zheng xing LI Yuan Lin LI Colledge of Automation EngineeringQingdao University Department of Mathematics Brock University

Let D be a generalized dihedral group and Autcol（D） its Coleman automorphism group. Denote by Outcol（D） the quotient group of Autcol（D） by Inn（D）, where Inn（D） is the inner automorphism group of D. It is proved that either Outcol（D） = i or Outcol（D） is an elementary abelian 2-group whose order is completely determined by the cardinality of π（D）. Furthermore, a necessary and sufficient condition for Outcol（D） = 1 is obtained. In addition, whenever Outcol（D） ≠ 1, it is proved that Autcol（D） is a split extension of Inn（D） by an elementary abelian 2-group for which an explicit description is given.

关键词： Coleman automorphism generalized dihedral group

Using a modified direct shear apparatus to explore gap and size effects on shear resistance of coarse-grained soil

在线全文

学校读者我要写书评

暂无评论

Particuology 2015年第6期13卷 82-89页

作者： Wenxi Fu xing zheng Xiaozhang Lei Jianhui Deng State Key Laboratory of Hydraulic and Mountain River Engineering Sichuan University Chengdu 610065 China Civil Engineering Hydrochina Guiyang Engineering Corporation LTD Guiyang 550081 China

This work used a modified direct shear apparatus, created newly by the authors, to explore effects of the gap between shear box halves and specimen size on the shear resistance of coarse-grained soil. The shear boxes of this apparatus were assembled from a series of steel structures capable of superimposition and nesting. Such characteristics facilitated variation of specimen size in both diameter and height. The new device can also maintain a constant gap during shearing. We performed a series of gap-effect and size-effect tests for two uniformly graded, coarse^grained soil samples. The test results showed that both the gap space and specimen size bad significant influences on shear resistance of the coarse-grained soil. Further, analysis of variations in shear strength indices led to a reasonable gap dimension and specimen size of the two soil samples.

关键词： Direct shear apparatus Gap effectSize effect Shear resistance Coarse-grained soil