Theoretical study and numerical simulations on the stress-induced twin interface nucleation in single-crystalline NiMnGa alloys

2019 ◽  
Vol 126 (11) ◽  
pp. 115101 ◽  
Author(s):  
Jiong Wang ◽  
Ping Du
Keyword(s):  
Numerical Simulations ◽  
Theoretical Study ◽  
Twin Interface ◽  
Single Crystalline

scholarly journals Theoretical Study and Optimization of the Biochemical Reaction Process by Means of Feedback Control Strategy

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Kaibiao Sun ◽  
Andrzej Kasperski ◽  
Yuan Tian
Keyword(s):  
Mathematical Model ◽  
Feedback Control ◽  
Theoretical Analysis ◽  
Numerical Simulations ◽  
Control Strategy ◽  
Theoretical Study ◽  
Biomass Productivity ◽  
Reaction Process ◽  
Biochemical Reaction ◽  
Feedback Control Strategy

The aim of this work is to present a theoretical analysis and optimization of a biochemical reaction process by means of feedback control strategy. To begin with, a mathematical model of the biochemical reaction process with feedback control is formulated. Then, based on the formulated model, the analysis of system's dynamics is presented. The optimization of the bioprocess is carried out, in order to achieve maximal biomass productivity. It is shown that during the optimization, the bioprocess with impulse effects loses the possibility of synchronization and strives for a simple continuous bioprocess. The analytical results presented in the work are validated by numerical simulations for the Tessier kinetics model.

Presenting the Fourth JDR Award

2019 ◽  
Vol 14 (4) ◽  
pp. 566-566
Author(s):  
Tomoyuki Takahashi
Keyword(s):  
Computer Graphics ◽  
Numerical Simulations ◽  
Theoretical Study ◽  
Professor Emeritus ◽  
Large Contribution ◽  
Disaster Reduction ◽  
Great Pleasure ◽  
Tsunami Disaster ◽  
And Control

It is our great pleasure to present the Fourth JDR Award to Professor Nobuo Shuto for his outstanding contributions to the Journal of Disaster Research (JDR) as the Honorary Editor. Professor Shuto, Professor Emeritus of Tohoku University, is a pioneer of the theoretical study of tsunamis. He has also made a large contribution to the development of numerical simulations, visualization through computer graphics, and other critical techniques for the study and control of tsunami disasters. The development of tsunami disaster reduction and management that we have today is thanks in large part to his achievements. On behalf of the JDR editorial board, I wish to thank Professor Nobuo Shuto for his efforts and to congratulate him as the winner of the Fourth JDR Award.

scholarly journals Stability Analysis of a Car-Following Model on Two Lanes

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yuhan Jia ◽  
Yiman Du ◽  
Jianping Wu
Keyword(s):  
Stability Analysis ◽  
Numerical Simulations ◽  
Soliton Solution ◽  
Nonlinear Stability ◽  
Theoretical Study ◽  
Mkdv Equation ◽  
Car Following ◽  
Good Consistency ◽  
Car Following Model ◽  
Linear And Nonlinear

Considering lateral influence from adjacent lane, an improved car-following model is developed in this paper. Then linear and nonlinear stability analyses are carried out. The modified Korteweg-de Vries (MKdV) equation is derived with the kink-antikink soliton solution. Numerical simulations are implemented and the result shows good consistency with theoretical study.

The impulse spectrum method for vibration suppression of a flexible multilink robot arm

2017 ◽  
Vol 24 (17) ◽  
pp. 3865-3881 ◽  
Author(s):  
Wenxi Zhang
Keyword(s):  
Numerical Simulations ◽  
Vibration Control ◽  
Disturbance Rejection ◽  
Theoretical Study ◽  
Vibration Suppression ◽  
Robot Arm ◽  
Response Delay ◽  
Spectral Functions ◽  
Spectrum Method ◽  
Free Feeding

The impulse spectrum method is proposed systematically, extending the method of vibration control by model-based feedforward. The impulse spectrum of multilink suggests free feeding directly responsible for flexible precessions, capable of vibration suppression (VSP) while maintaining swift response. The invariance criterion over piecewise extents of multilink configuration is proposed, with the extent given by allowable insensitivity as the basis of outputs interference for VSP. On the invariance assumption, the spectral functions are extractable for the annihilator of vibration of multilink, with the oscillatory matrix for multimode oscillators derived as the key of the annihilator, showing the feasibility of simultaneous VSP of the oscillators of multilink. Robust VSP is ensured by designing the impulse spectrum with respect to the augmented oscillatory matrix of some order, and hybrid robustness against variation of concerned parameters that can reduce response delay. The properties of the impulse spectrum for VSP of flexible multilink are presented for the guidelines to design impulse spectra for diverse potential and purposes, including the metric array-based bandwide VSP of nonconcurrent multimode in favor of disturbance-rejection. Numerical simulations are conducted to validate the theoretical study, demonstrating the effectiveness of the method.

scholarly journals Influence of Sandwich-Type Constrained Layer Damper Design Parameters on Damping Strength

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Inaki Merideno ◽  
Javier Nieto ◽  
Nere Gil-Negrete ◽  
José Germán Giménez Ortiz ◽  
Aitor Landaberea ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Theoretical Study ◽  
Design Parameters ◽  
Resonant Vibration ◽  
Vibration Frequencies ◽  
Railway Wheel ◽  
Damping Effect ◽  
Resonance Frequencies ◽  
Sandwich Type ◽  
Damper Design

This paper presents a theoretical study of the parameters that influence sandwich-type constrained layer damper design. Although there are different ways to reduce the noise generated by a railway wheel, most devices are based on the mechanism of increasing wheel damping. Sandwich-type constrained layer dampers can be designed so their resonance frequencies coincide with the wheel’s resonant vibration frequencies, and thus the damping effect can be concentrated within the frequency ranges of interest. However, the influence of design parameters has not yet been studied. Based on a number of numerical simulations, this paper provides recommendations for the design stages of sandwich-type constrained layer dampers.

Li atoms deposited on single crystalline MgO(001) surface. A combined experimental and theoretical study

2008 ◽  
Vol 450 (4-6) ◽  
pp. 308-311 ◽  
Author(s):  
J.C. Lian ◽  
E. Finazzi ◽  
C. Di Valentin ◽  
T. Risse ◽  
H.-J. Gao ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Single Crystalline

“Preparation of Single Crystalline Gold Films for ED Studies”

1972 ◽  
Vol 30 ◽  
pp. 634-635
Author(s):  
Joseph D. C. Peng
Keyword(s):  
Crystal Morphology ◽  
Diffraction Theory ◽  
Scattering Matrix ◽  
Vacuum Evaporation ◽  
Gold Films ◽  
Matrix Formulation ◽  
Silver Films ◽  
Single Crystalline ◽  
Grating Pattern ◽  
Stacking Disorder

The relative intensities of the ED spots in a cross-grating pattern can be calculated using N-beam electron diffraction theory. The scattering matrix formulation of N-beam ED theory has been previously applied to imperfect microcrystals of gold containing stacking disorder (coherent twinning) in the (111) crystal plane. In the present experiment an effort has been made to grow single-crystalline, defect-free (111) gold films of a uniform and accurately know thickness using vacuum evaporation techniques. These represent stringent conditions to be met experimentally; however, if a meaningful comparison is to be made between theory and experiment, these factors must be carefully controlled. It is well-known that crystal morphology, perfection, and orientation each have pronounced effects on relative intensities in single crystals.The double evaporation method first suggested by Pashley was employed with some modifications. Oriented silver films of a thickness of about 1500Å were first grown by vacuum evaporation on freshly cleaved mica, with the substrate temperature at 285° C during evaporation with the deposition rate at 500-800Å/sec.

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