Results 231 to 240 of about 26,026,661 (311)

Phase control of the Pancharatnam phase

Physical Review A, 2009
We propose a method to control the atomic dynamics in the presence of electromagnetic fields. Instead of measuring the population dynamics, we focus on the possibility of controlling the Pancharatnam phase. For a two-level system we find that this phase can be optically induced and controlled by the phase shift.
Bouchene, M. A., Abdel-Aty, M.
openaire   +1 more source

Phase Control and In-situ Passivation of Quasi-2D Metal Halide Perovskites for Spectrally Stable Blue Light-Emitting Diodes.

ACS Applied Materials and Interfaces, 2020
Fabricating efficient and spectrally stable pure-blue perovskite light-emitting diodes (LEDs) has been elusive and remains of great interest. Herein, we show the incorporation of diammonium salts in quasi-2D perovskite precursors for phase control of ...
Michael Worku, Qingquan He, Liang-jin Xu, Jisook Hong, R. Yang, L. Tan, Biwu Ma   +6 more
semanticscholar   +1 more source

Controlled Optimization of Phases at an Intersection

Transportation Science, 1997
This paper presents a general purpose algorithm for real-time traffic control at an intersection. Our methodology, based on dynamic programming, allows optimization of a variety of performance indices such as delay, stops and queue lengths. Furthermore, optimal phase sequencing is a direct by-product of this new approach.
Suvrajeet Sen, K. Larry Head
openaire   +1 more source

Phase-Controlled Currents in Semiconductors

Physical Review Letters, 1995
The direction of emission of photoexcited electrons in semiconductors is controlled by adjusting the relative phase difference between a midinfrared radiation and its second harmonic. This is achieved by using quantum interference of electrons produced with one- and two-photon bound-to-free intersubband transitions in AlGaAs/GaAs quantum well ...
Dupont, E., Corkum, P. B., Liu, H. C., Buchanan, M., Wasilewski, Z. R.   +4 more
openaire   +3 more sources

Crystal Phase Control of Gold Nanomaterials by Wet-Chemical Synthesis.

Accounts of Chemical Research, 2020
ConspectusGold (Au), a transition metal with an atomic number of 79 in the periodic table of elements, was discovered in approximately 3000 B.C. Due to the ultrahigh chemical stability and brilliant golden color, Au had long been thought to be a most ...
Shiyao Lu, Jinzhe Liang, Huiwu Long, Huangxu Li, Xichen Zhou, Zhentao He, Ye Chen, Hongyan Sun, Zhanxi Fan, Hua Zhang   +9 more
semanticscholar   +1 more source

Deep-learning-assisted, two-stage phase control method for high-power mode-programmable orbital angular momentum beam generation

, 2020
High-power mode-programmable orbital angular momentum (OAM) beams have received substantial attention in recent years. They are widely used in optical communication, nonlinear frequency conversion, and laser processing.
Tianyue Hou, Yi An, Qi Chang, P. Ma, Jun Li, Liangjin Huang, Zhi Dong, Wu Jian, R. Su, Yanxing Ma, P. Zhou   +10 more
semanticscholar   +1 more source

Phase Control in Monometallic and Alloy Nanomaterials.

Chemical Reviews
Metal nanomaterials with unconventional phases have been recently developed with a variety of methods and exhibit novel and attractive properties such as high activities for various catalytic reactions and magnetic properties.
K. Kusada, Hiroshi Kitagawa
semanticscholar   +1 more source

A Low-Loss Passive D-Band Phase Shifter for Calibration-Free, Precise Phase Control

IEEE Journal of Solid-State Circuits
A low-loss passive phase shifter is presented for calibration-free, precise phase control at $D$ -band. The proposed topology manipulates time delay by controlling propagation distance in a trombone-like structure formed with two parallel transmission ...
M. Abbasi, Wooram Lee
semanticscholar   +1 more source

High-Transmission Ultrathin Huygens’ Metasurface with 360° Phase Control by Using Double-Layer Transmitarray Elements

Physical Review Applied, 2019
Metasurfaces (two-dimensional metamaterials) have attracted much attention in recent years. However, due to the symmetric design of its cascaded elements, a traditional transmission-type metasurface must be at least three layers thick to achieve high ...
L. Wu, H. Ma, Y. Gou, R. Wu, Z. Wang, Meng Wang, Xinxin Gao, T. Cui   +7 more
semanticscholar   +1 more source

Condensed-phase control? Or gas-phase control?

Combustion, Explosion, and Shock Waves, 2007
Publishing the discussion of two famous researchers in the field of solid propellant combustion, the Editorial Board has to mention that the issues discussed have a long story. The ideas on the leading role of solid-phase reactions in combustion of double-base and composite propellants were formulated by P. F.
openaire   +1 more source