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Search Results: 1 - 10 of 548497 matches for " G. -J. Wang "
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THz Oscillations in a GaN Based Planar Nano-Device  [PDF]
K. Y. Xu, Y. N. Wang, Z. N. Wang, J. W. Xiong, G. Wang
Journal of Computer and Communications (JCC) , 2013, DOI: 10.4236/jcc.2013.17012

Gunn oscillations in a GaN based planar nano-device have been studied by ensemble Monte Carlo (EMC) method. Simulation results show that when the channel length of the device reduces to 450 nm, THz oscillations (about 0.3 THz) can be obtained. Also the phase of the oscillations can be controlled by the initial conditions that excite the Gunn domains. Moreover, through adjusting the phase difference between the oscillations in a double-channels device, which attained by parallel connecting two single-channel devices, the frequency of the device shifts from 0.3 THz to 0.6 THz. This phenomenon remains in devices with shorter channel-length, unless the channel-length is too short to support Gunn oscillations. The possible underlying mechanisms are also discussed.

Quantum inductance and negative electrochemical capacitance at finite frequency
J. Wang,B. G. Wang,H. Guo
Physics , 2007, DOI: 10.1103/PhysRevB.75.155336
Abstract: We report on theoretical investigations of frequency dependent quantum capacitance. It is found that at finite frequency a quantum capacitor can be characterized by a classical RLC circuit with three parameters: a static electrochemical capacitance, a charge relaxation resistance, and a quantum inductance. The quantum inductance is proportional to the characteristic time scale of electron dynamics and due to its existence, the time dependent current can accumulate a phase delay and becomes lagging behind the applied ac voltage, leading to a negative effective capacitance.
Genetic analysis and QTL mapping of maize yield and associate agronomic traits under semi-arid land condition
J Guo, G Su, J Zhang, G Wang
African Journal of Biotechnology , 2008,
Abstract: Drought is one of the major limiting factors in sustainable maize production all over the world. In order to develop maize variety with drought tolerance, it is necessary to explore the genetic basis and map the quantitative trait loci (QTLs) controlling the yield and associate agronomic traits under semi-arid land condition. In this study the QTLs for flower time, plant height, yield and yield components were characterized with recombinant inbred lines (RIL) derived from the cross 5003 × p138 under drought stress and well-watered regime in the years 2004 and 2005, respectively. A linkage map was constructed based on 101 simple sequence repeat (SSR) markers covering a total of 1395.2 cM genetic distance, and an average distance of 13.81 cM between markers. A total of 51 QTLs were identified for 10 traits on 10 different chromosomes. Under the well-watered regime, 25 QTLs were identified for 9 traits, whereas under the water-stressed conditions, 22 QTLs were found for 7 traits. Four QTLs for drought tolerance index were found. Phenotypic variation associated with each QTL ranges from 1.68 to 13.3%. The results reveal that most related traits cluster in chromosomal blocks: bnlg1614-bnlg1083 on chromosome 1 and bnlg1634-bnlg1209 on chromosome 9 for plant height, bnlg1035-bnlg1564 on chromosome 1 for yield and its components and drought insistence index, near NC012 and bnlg2907-bnlg1136 on chromosome 6 for flower time and anthesis-silking interval (ASI), and near bnlg1063 on chromosome 5 and bnlg1241 on chromosome 4 for flower time. Four QTLs for male flower time were identified in marker bnlg1327-bnlg1812 on chromosome 8 under two water regimes. These QTLs may be useful for the marker-assisted selection in maize breeding for drought resistance.
Lower bounds of Growth of Hopf algebras
D. -G. Wang,J. J. Zhang,G. Zhuang
Mathematics , 2011,
Abstract: Some lower bounds of GK-dimension of Hopf algebras are given.
Coassociative Lie algebras
D. -G. Wang,J. J. Zhang,G. Zhuang
Mathematics , 2012,
Abstract: A coassociative Lie algebra is a Lie algebra equipped with a coassociative coalgebra structure satisfying a compatibility condition. The enveloping algebra of a coassociative Lie algebra can be viewed as a coalgebraic deformation of the usual universal enveloping algebra of a Lie algebra. This new enveloping algebra provides interesting examples of noncommutative and noncocommutative Hopf algebras and leads to a classification of connected Hopf algebras of Gelfand-Kirillov dimension four in [WZZ].
Connected Hopf algebras of Gelfand-Kirillov dimension four
D. -G. Wang,J. J. Zhang,G. Zhuang
Mathematics , 2013,
Abstract: We classify connected Hopf algebras of Gelfand-Kirillov dimension 4 over an algebraic closed field of characteristic zero.
Primitive Cohomology of Hopf algebras
D. -G. Wang,J. J. Zhang,G. Zhuang
Mathematics , 2014,
Abstract: Primitive cohomology of a Hopf algebra is defined by using a modification of the cobar construction of the underlying coalgebra. Among many of its applications, two classifications are presented. Firstly we classify all non locally PI, pointed Hopf algebra domains of Gelfand-Kirillov dimension two; and secondly we classify all pointed Hopf algebras of rank one. The first classification extends some results of Brown, Goodearl and others in an ongoing project to understand all Hopf algebras of low Gelfand-Kirillov dimension. The second generalizes results of Krop-Radford and Wang-You-Chen which classified Hopf algebras of rank one under extra hypothesis. Properties and algebraic structures of the primitive cohomology are discussed.
Hopf algebras of GK-dimension two with vanishing Ext-group
D. -G. Wang,J. J. Zhang,G. Zhuang
Mathematics , 2011,
Abstract: We construct and study a family of finitely generated Hopf algebra domains $H$ of Gelfand-Kirillov dimension two such that $\Ext^1_H(k,k)=0$. Consequently, we answer a question of Goodearl and the second-named author.
New compounds of natural resources in 2008
J Wang, Q Peng, G Guoyu
African Journal of Biotechnology , 2009,
Abstract: Natural products have been the most productive source of new compounds. Hundreds of new compounds are in development. Some of them have pharmaceutical activities, particularly as anticancer and anti-infective agents. Until October, there are 1913 new compounds separated from natural sources in 2008. The compounds have covered a wide range of species, including alkaloids, flavones, terpenoids and so on. It is hoped that more efficient and effective compounds of natural resources will
A summer climate regime over Europe modulated by the North Atlantic Oscillation
G. Wang, A. J. Dolman,A. Alessandri
Hydrology and Earth System Sciences (HESS) & Discussions (HESSD) , 2011,
Abstract: Recent summer heat waves in Europe were found to be preceded by precipitation deficits in winter. Numerical studies suggest that these phenomena are dynamically linked by land-atmosphere interactions. However, there exists as yet no complete observational evidence that connects summer climate variability to winter precipitation and the relevant circulation patterns. In this paper, we investigate the functional responses of summer mean and maximum temperature (June–August, Tmean and Tmax) as well as soil moisture proxied by the self-calibrating Palmer drought severity index (scPDSI) to preceding winter precipitation (January–March, PJFM) for the period 1901–2005. All the analyzed summer fields show distinctive responses to PJFM over the Mediterranean. We estimate that 10 ~ 15% of the interannual variability of Tmax and Tmean over the Mediterranean is statistically forced by PJFM. For the scPDSI this amounts to 10 ~ 25%. Further analysis shows that these responses are highly correlated to the North Atlantic Oscillation (NAO) regime over the Mediterranean. We suggest that NAO modulates European summer temperature by controlling winter precipitation that initializes the moisture states that subsequently interact with temperature. This picture of relations between European summer climate and NAO as well as winter precipitation suggests potential for improved seasonal prediction of summer climate for particular extreme events.
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