50,785 research outputs found
The Sympathetic Efferent Innervation of the Cutaneous and Muscle Veins in Cats-A Comparative Study Using Retrograde Localization with Horseradish Peroxidase
No full textExploration of the memory effect on the photon-assisted tunneling via a single quantum dot: A generalized Floquet theoretical approach
No full text The generalized Floquet approach is developed to study memory effect on electron transport phenomena through a periodically driven single quantum dot in an electrode–multi-level dot–electrode nanoscale quantum device. The memory effect is treated using a multi-function Lorentzian spectral density (LSD) model that mimics the spectral density of each electrode in terms of multiple Lorentzian functions. For the symmetric single-function LSD model involving a single-level dot, the underlying single-particle propagator is shown to be related to a 2×2 effective time-dependent Hamiltonian that includes both the periodic external field and the electrode memory effect. By invoking the generalized Van Vleck (GVV) nearly degenerate perturbation theory, an analytical Tien-Gordon-like expression is derived for arbitrary order multi-photon resonance d.c. tunneling current. Numerically converged simulations and the GVV analytical results are in good agreement, revealing the origin of multi-photon coherent destruction of tunneling and accounting for the suppression of the staircase jumps of d.c. current due to the memory effect. Specially, a novel blockade phenomenon is observed, showing distinctive oscillations in the field-induced current in the large bias voltage limit. </jats:p
Localization scheme based on multistatic radar systems
No full text本論文通訊作者投稿時必須使用ORCID; 本論文顯示之 Corresponding author was used my ORCID: 0000-0002-5266-9975 是第五作者Hsing-Chung Chen. Please find the web link below. URI: http://orcid.org/0000-0002*5266-9975 Hsing-Chung Chen (0000-0002-5266-9975) - ORCID | Connecting to orcid.org/0000-0002-5266-9975 Hsing-Chung Chen. ORCID iD. orcid.org/0000-0002-5266-9975. Other IDs. Scopus Author ID: 21933446800
Memory effect on the photon-assisted tunneling through a single quantum dot: Generalized Floquet approach
No full text本文利用廣義Floquet理論研究單一量子點的傳輸行為，尤其著重於光子輔助穿遂現象的記憶效應。藉由廣義Floquet理論，我們可以將一具週期性的薛丁格方程，改寫成一個與時間無關且無限維度的等效方程。利用微擾分析得到解析結果，進而推導出包含記憶效應之電流與穿遂係數表示式。在此架構下，我們探討記憶效應對光子輔助穿遂現象的影響，其中包含多光子同調穿隧截止現象、電流梯級現象、庫倫阻塞現象。另外，我們探討溫度對於電子傳輸的影響。The generalized Floquet approach is extended to sutdy the memory effect beyond the wide band limit on the photon-assisted electron tunneling through a periodically driven single quantum dot. An analytical Tien-Gordon-like expression, including the memory effect, for the current and transmission coefficient is derived based on the generalized Van Vleck (GVV) nearly degenerate perturbation theory. As a result, multiphoton (MP) coherent
destruction of tunneling (CDT) phenomenon for small bias voltage is predicted by the transmission coefficients for the respective scattering channels. Numerically converged simulations and GVV analytical results are compared and both reveal that the memory effect leads to the suppression of the d.c. current stair-step jumps when varying the bias voltage on the single quantum dot. Furthermore, a novel blockade phenomenon that does not exist in the wide band limit is observed when the memory effect becomes significant, showing that the pumped current oscillate distinctively with respect to the gate voltage in the in the large bias limit. Finally, analytical expressions are obtained in the wide band limit, showing the temperature dependence of the conductance and current
A secure group-based mobile chat protocol
No full text本論文通訊作者投稿時必須使用ORCID; 本論文顯示之 Corresponding author was used my ORCID: 0000-0002-5266-9975 是第一作者Hsing-Chung Chen. Please find the web link below. URI: http://orcid.org/0000-0002*5266-9975 Hsing-Chung Chen (0000-0002-5266-9975) - ORCID | Connecting to orcid.org/0000-0002-5266-9975 Hsing-Chung Chen. ORCID iD. orcid.org/0000-0002-5266-9975. Other IDs. Scopus Author ID: 21933446800
Generalized ray method for three-dimensional propagation in a penetrable wedge
No full textOpen access funding provided by TU Wien (TUW). The research work reported in this paper was made from 1998 to 2013 by Prof. Yih-Hsing Pao, Prof. Chi-Fang Chen, and Dr. Piotr Borejko; in June, 2013, Prof. Yih-Hsing Pao passed away; from then on the work was continued until 2017 by Prof. Chi-Fang Chen and Dr. Piotr Borejko. The work was funded in 1998-1999 by the National Science Council (currently the Ministry of Science and Technology) of the Republic of China when Dr. Piotr Borejko was employed for two years as a guest researcher and worked closely with Prof. Yih-Hsing Pao and Prof. Chi-Fang Chen at the National Taiwan University (NTU), Taipei, Taiwan, Republic of China. The work was also funded (short visits) in 2009, 2013, 2014, and 2017 by the TU Wien, Vienna, Austria, when Prof. Chi-Fang Chen visited Dr. Piotr Borejko at the TU Wien; in 2005 and 2011 by the NTU when Dr. Piotr Borejko visited Prof. Yih-Hsing Pao and Prof. Chi-Fang Chen at the NTU; and again in 2015 by the NTU when Dr. Piotr Borejko visited Prof. Chi-Fang Chen at the NTU. The authors are pleased to acknowledge a number of improvements suggested by anonymous reviewers
Ta Chen. - Population in modern China
No full textSauvy Alfred. Ta Chen. - Population in modern China. In: Population, 2ᵉ année, n°1, 1947. pp. 171-172
Direct solid-phase synthesis of octreotide conjugates: precursors for use as tumor-targeted radiopharmaceuticals
No full textMemory effect on the multiphoton coherent destruction of tunneling in the electron transport of nanoscale systems driven by a periodic field: A generalized Floquet approach
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