Multi-function scattering beam regulation based on the superposition method of geometric phase coded metasurface sequences

Abstract Since strain engineering plays a key role in semiconductor technology development, a reliable and reproducible technique to measure local strain in devices is necessary for process development and failure analysis. In this paper, geometric phase analysis of high angle annular dark field - scanning transmission electron microscope images is presented as an effective technique to measure local strains in the current node of Si based transistors.

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Structure Sensitivity Analysis and Dynamic Performance Optimization of Marine Gearbox

Volume 10: 2017 ASME International Power Transmission and Gearing Conference ◽

10.1115/detc2017-67072 ◽

2017 ◽

Author(s):

Tengjiao Lin ◽

Daokun Xie ◽

Ziran Tan ◽

Bo Liu

Keyword(s):

Sensitivity Analysis ◽

Performance Optimization ◽

Optimization Design ◽

Dynamic Performance ◽

Structure Sensitivity ◽

Superposition Method ◽

Structure Parameters ◽

Analysis Model ◽

Vibration Acceleration ◽

Response Optimization

The aim of this paper is to investigate the influence of structure parameters on the vibration characteristics and improve the dynamic performance of marine gearbox. A finite element model was established to solve the dynamic response by using modal superposition method. Based on the theory of multi-objective optimization design, the structure sensitivity analysis model of marine gearbox was established, which takes the structure parameters of the housing as design variables. The modal and response sensitivity was obtained by using the optimal gradient method. According to the results of sensitivity analysis, a modal and response optimization model of marine gearbox was established. The objective was to avoid natural frequencies from the excitation frequencies and minimize the root mean square of vibration acceleration of the evaluating points on the surface of housing. Then the modal optimization and response optimization of gearbox were carried out by using zero-order and first-order optimization method. The results indicate that the dynamic optimization of the gearbox can be achieved. After optimization, the amplitude of vibration acceleration of the evaluating points on the housing surface has been reduced and the resonance of marine gearbox can be avoided.

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Ultraviolet wavefront manipulation using topological insulator metasurfaces based on geometric phase

Optics Communications ◽

10.1016/j.optcom.2021.126812 ◽

2021 ◽

Vol 487 ◽

pp. 126812

Author(s):

Mingli Wan ◽

Pengfei Ji ◽

Rongrong Wang ◽

Xiaopeng Zhang ◽

Mingli Tian ◽

...

Keyword(s):

Topological Insulator ◽

Geometric Phase

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GEOMETRIC PHASE AND DISENTANGLEMENT OF A MOVING FOUR-LEVEL ATOM IN THE PRESENCE OF NONLINEAR MEDIUM

International Journal of Quantum Information ◽

10.1142/s0219749912500074 ◽

2012 ◽

Vol 10 (01) ◽

pp. 1250007 ◽

Cited By ~ 3

Author(s):

NOUR ZIDAN ◽

S. ABDEL-KHALEK ◽

M. ABDEL-ATY

Keyword(s):

System Dynamics ◽

Geometric Phase ◽

Nonlinear Medium ◽

Atomic Motion ◽

Kerr Medium ◽

Mode Structure ◽

Field Mode ◽

Level Atom

In this paper, we investigate the geometric phase of the field interacting with a moving four-level atom in the presence of Kerr medium. The results show that the atomic motion, the field-mode structure and Kerr medium play important roles in the evolution of the system dynamics. As illustration, we examine the behavior of the geometric phase and entanglement with experimentally accessible parameters. Some new aspects are observed and discussed.

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Shear response of steel fiber reinforced recycled concrete-filled steel tube columns

Advances in Structural Engineering ◽

10.1177/13694332211009322 ◽

2021 ◽

pp. 136943322110093

Author(s):

Zhenzhen Liu ◽

Yiyan Lu ◽

Shan Li ◽

Jiancong Liao

Keyword(s):

Axial Compression ◽

Steel Fiber ◽

Steel Tube ◽

Shear Capacity ◽

Recycled Concrete ◽

Recycled Aggregate ◽

Superposition Method ◽

Fiber Reinforced ◽

Concrete Filled Steel Tube ◽

Shear Span

A comprehensive study of the shear characteristics of steel fiber reinforced recycled concrete-filled steel tube (SRCFST) columns is conducted. 50 CFST stub columns are tested with the variables of steel tube diameter-thickness ratio ( D/t), shear span-to-depth ratio (λ), axial compression ratio ( n), and concrete mix. Two types of cements, three recycled aggregate percentages, three water-cement ratios, and three steel fiber contents are considered in design of concrete mixes. The experimental results show that SRCFST columns present the coincident shear behavior of the ordinary CFST columns. As λ is increased, shear resistance shows a downtrend, while the flexural strength presents an increasing trend. Imposing axial compression or thickening steel tube contributes to an adequate safety margin in plastic period. Based on the contributions superposition method, a predicted model of the shear capacity of SRCFST columns is proposed in consideration of shear-span ratio, axial compression, and self-stress.

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