Transmission efficiency comparison between dual-mode conversion incidence and normal incidence

2021 ◽  
Author(s):  
Ki Chang Kang ◽  
Young Hun Kim ◽  
Kwan Kyu Park ◽  
Kamyar Firouzi ◽  
Burtus T. Khuri-Yakub
Keyword(s):  
Mode Conversion ◽  
Normal Incidence ◽  
Transmission Efficiency ◽  
Dual Mode ◽  
Efficiency Comparison

scholarly journals SWRT: A package for semi-analytical solutions of surface wave propagation, including mode conversion, across transversely aligned vertical discontinuities

2018 ◽  
Vol 7 (1) ◽  
pp. 101-112 ◽  
Author(s):  
Arjun Datta
Keyword(s):  
Wave Propagation ◽  
Surface Wave ◽  
Mode Conversion ◽  
Normal Incidence ◽  
Seismic Wave Propagation ◽  
Reflection And Transmission ◽  
Computing Power ◽  
Transmission Coefficients ◽  
Surface Wave Propagation ◽  
Core Functionality

Abstract. We present a suite of programs that implement decades-old algorithms for computation of seismic surface wave reflection and transmission coefficients at a welded contact between two laterally homogeneous quarter-spaces. For Love as well as Rayleigh waves, the algorithms are shown to be capable of modelling multiple mode conversions at a lateral discontinuity, which was not shown in the original publications or in the subsequent literature. Only normal incidence at a lateral boundary is considered so there is no Love–Rayleigh coupling, but incidence of any mode and coupling to any (other) mode can be handled. The code is written in Python and makes use of SciPy's Simpson's rule integrator and NumPy's linear algebra solver for its core functionality. Transmission-side results from this code are found to be in good agreement with those from finite-difference simulations. In today's research environment of extensive computing power, the coded algorithms are arguably redundant but SWRT can be used as a valuable testing tool for the ever evolving numerical solvers of seismic wave propagation. SWRT is available via GitHub (https://github.com/arjundatta23/SWRT.git).

Applications of VUV extra-focus mechanism: high-performance dual-mode monochromator from VUV to soft X-ray

2015 ◽  
Vol 22 (6) ◽  
pp. 1353-1358 ◽  
Author(s):  
Chaofan Xue ◽  
Yanqing Wu ◽  
Ying Zou ◽  
Lian Xue ◽  
Zhi Guo ◽  
...  
Keyword(s):  
High Performance ◽  
Vacuum Ultraviolet ◽  
Normal Incidence ◽  
Resolving Power ◽  
Dual Mode ◽  
Included Angle ◽  
X Ray ◽  
Line Spacing ◽  
Grating Monochromator ◽  
Mode Solution

A new monochromator scheme is presented in which an extra-focus constant-included-angle varied-line-spacing cylindrical-grating monochromator (extra-focus CIA-VCGM) is conveniently combined with a variable-included-angle varied-line-spacing plane-grating monochromator (VIA-VPGM). This dual-mode solution delivers high performance in the energy range from vacuum ultraviolet (VUV) to soft X-ray. The resolving power and the efficiency of this dual-mode grating monochromator are analyzed in detail based on realistic parameters. Comparisons with the commonly used variable-included-angle plane-grating monochromator and normal-incidence monochromator (VIA-PGM/NIM) hybrid monochromator are made.

scholarly journals SWRT: A package for semi-analytical solutions of surface wave propagation, including mode conversion, across transversely aligned vertical discontinuities

2017 ◽  
Author(s):  
Arjun Datta
Keyword(s):  
Wave Propagation ◽  
Surface Wave ◽  
Mode Conversion ◽  
Normal Incidence ◽  
Seismic Wave Propagation ◽  
Reflection And Transmission ◽  
Computing Power ◽  
Transmission Coefficients ◽  
Surface Wave Propagation ◽  
Core Functionality

Abstract. We present a suite of programs that implement decades-old algorithms for computation of seismic surface wave reflection and transmission coefficients at a welded contact between two laterally homogeneous quarter-spaces. For Love as well as Rayleigh waves, the algorithms are shown to be capable of modelling multiple mode conversions at a lateral discontinuity, which was not shown in the original publications or in the subsequent literature. Only normal incidence at a lateral boundary is considered so there is no Love-Rayleigh coupling, but incidence of any mode and coupling to any (other) mode can be handled. The code is written in Python and makes use of SciPy's Simpson's rule integrator and NumPy's linear algebra solver for its core functionality. Transmission side results from this code are found to be in good agreement with those from finite difference simulations. In today's research environment of extensive computing power, the coded algorithms are arguably redundant but SWRT can be used as a valuable testing tool for the ever evolving numerical solvers of seismic wave propagation. SWRT is available via GitHub (https://github.com/arjundatta23/sw_reftrans.git).

Development of Dual Mode X-screw -A Novel Load-Sensitive Linear Actuator with a Wide Transmission Range-

2000 ◽  
Vol 12 (2) ◽  
pp. 66-71
Author(s):  
Tetsuto Hagiwara ◽  
◽  
Shigeo Hirose ◽  
Keyword(s):  
Axial Load ◽  
Transmission Efficiency ◽  
Transmission Range ◽  
Linear Actuator ◽  
Transmitted Power ◽  
Dual Mode ◽  
Input Force ◽  
Lead Screw ◽  
Output Force ◽  
Variable Transmission

X-screw, a load-sensitive linear actuator that we have proposed, has many desirable characteristics, but one drawback is that the linear motion is much slower than a conventional lead screw. When the axial load is small, the transmission efficiency of X-screw is approximately the same as that of a lead screw since the transmitted power is low in this case. Therefore we have developed a Dual Mode version of X-screw called ""DM X-screw"". This mechanism is able to automatically switch between lead screw mode and X-screw mode in response to the axial load. This feature makes it possible to apply DM X-screw to many mechanical systems. We have used this mechanism in a pantograph jack that makes use of its dual mode loadsensitive variable transmission properties. This jack can be operated with a small input force and unlike conventional jacks, several of these jacks can be used in combination to overcome the output force limitations of normal pantograph jacks.

Dual-mode dual-bandpass filter with transmission zeros using coupling mode conversion

2012 ◽  
Vol 6 (3) ◽  
pp. 251 ◽  
Author(s):  
J.-W. Baik ◽  
S.-M. Han ◽  
T.-H. Lee ◽  
Y.-J. Chong ◽  
J. Choi ◽  
...  
Keyword(s):  
Bandpass Filter ◽  
Mode Conversion ◽  
Dual Mode ◽  
Transmission Zeros ◽  
Coupling Mode

Dual-mode conversion luminescent properties of PbF2:Er3+, Yb3+ phosphors

2019 ◽  
Vol 12 (03) ◽  
pp. 1950033
Author(s):  
Hong-Wei Liu ◽  
Jia-Liang Sun ◽  
Yi-Fan Wang ◽  
Xiao-Yi Ma ◽  
Biao Li ◽  
...  
Keyword(s):  
Mode Conversion ◽  
Energy Levels ◽  
Green Emission ◽  
Luminescent Properties ◽  
Solid State Reaction Method ◽  
Enhancement Effect ◽  
X Ray Diffraction ◽  
Dual Mode ◽  
Red Emission ◽  
Source Excitation

PbF2: Er[Formula: see text], Yb[Formula: see text] phosphors with the property of dual-mode conversion were prepared successfully by the high-temperature solid-state reaction method. The structure and luminescence properties of the samples were characterized by X-ray diffraction (XRD) and fluorescence spectrum method. The luminescence mechanisms of the samples under single ultraviolet (UV) or infrared (IR) light source excitation and UV[Formula: see text]IR co-excitation were analyzed. Under 376, 980 and 1550[Formula: see text]nm excitation, the phosphors showed intense green and red emission, the green emission (520–570[Formula: see text]nm) and the red emission (650–680[Formula: see text]nm) originated from the 2H[Formula: see text]I[Formula: see text], 4S[Formula: see text]I[Formula: see text] and 4F[Formula: see text]I[Formula: see text] transitions of Er[Formula: see text] ions, respectively. The fluorescence enhancement effect was observed in the UV and IR co-excited samples, which is derived from the infrared photon reabsorption of the ions at metastable energy levels.

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