Deterministic Switching of Polarization Vortices in Compositionally Graded Ferroelectrics Using a Mechanical Field

2019 ◽  
Vol 11 (5) ◽  
Author(s):  
Le Van Lich ◽  
Tinh Quoc Bui ◽  
Takahiro Shimada ◽  
Takayuki Kitamura ◽  
Trong-Giang Nguyen ◽  
...  
Keyword(s):  
Mechanical Field ◽  
Deterministic Switching

Efficiency of open cast peat mining with mechanical field dewatering

2019 ◽  
Vol 7 ◽  
pp. 30-41
Author(s):  
A.V. Mikhailov ◽  
◽  
O.J. Garmaev ◽  
A.S. Fedorov ◽  
D.R. Garifullin ◽  
...  
Keyword(s):  
Peat Mining ◽  
Mechanical Field ◽  
Open Cast

scholarly journals Reducing Dzyaloshinskii-Moriya interaction and field-free spin-orbit torque switching in synthetic antiferromagnets

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ruyi Chen ◽  
Qirui Cui ◽  
Liyang Liao ◽  
Yingmei Zhu ◽  
Ruiqi Zhang ◽  
...  
Keyword(s):  
Domain Wall ◽  
Tunnel Junctions ◽  
Low Power Consumption ◽  
Stray Field ◽  
Magnetic Memory ◽  
Spin Orbit ◽  
Theoretic Analysis ◽  
Spintronic Devices ◽  
Deterministic Switching ◽  
Moriya Interaction

AbstractPerpendicularly magnetized synthetic antiferromagnets (SAF), possessing low net magnetization and high thermal stability as well as easy reading and writing characteristics, have been intensively explored to replace the ferromagnetic free layers of magnetic tunnel junctions as the kernel of spintronic devices. So far, utilizing spin-orbit torque (SOT) to realize deterministic switching of perpendicular SAF have been reported while a large external magnetic field is typically needed to break the symmetry, making it impractical for applications. Here, combining theoretic analysis and experimental results, we report that the effective modulation of Dzyaloshinskii-Moriya interaction by the interfacial crystallinity between ferromagnets and adjacent heavy metals plays an important role in domain wall configurations. By adjusting the domain wall configuration between Bloch type and Néel type, we successfully demonstrate the field-free SOT-induced magnetization switching in [Co/Pd]/Ru/[Co/Pd] SAF devices constructed with a simple wedged structure. Our work provides a practical route for utilization of perpendicularly SAF in SOT devices and paves the way for magnetic memory devices with high density, low stray field, and low power consumption.

scholarly journals Prediction of preload attenuation of ball screw based on support vector machine

2018 ◽  
Vol 10 (9) ◽  
pp. 168781401879916 ◽  
Author(s):  
Kai Chen ◽  
Li Zu ◽  
Li Wang
Keyword(s):  
Support Vector Machine ◽  
Working Condition ◽  
Friction Torque ◽  
Ball Screw ◽  
Support Vector ◽  
Theoretical Derivation ◽  
Mechanical Field ◽  
Changing Trend ◽  
Engineering Significance ◽  
The Relationship

Ball screw is a mechanical device widely used in mechanical field. The reverse clearance of ball screw will reduce its precision. In order to eliminate the reverse clearance, it is necessary to apply preload to the ball screw. It is very difficult to measure the preload in real time, and the data are large and time-consuming. By using machine learning method to predict and supervise preload, the changing trend of working condition of ball screw can be evaluated in advance, and the working precision of screw is controlled, which has important engineering significance. In this article, the relationship between the preload and the friction torque is obtained through theoretical derivation and experimental verification. Then, the support vector machine is used as a tool to model the friction torque of ball screw with the parameters of material, lubrication, and revolution, and predict the value and trend of preload to complete the supervision and prediction of the preload of the ball screw. By comparing the experimental results, it is proved that the support vector machine is feasible in predicting and supervising the attenuation of the preload of ball screw.

scholarly journals Case study concerning successful Romanian SMEs development by students education and entrepreneurial training

2021 ◽  
Vol 3 (1) ◽  
pp. 18-24
Author(s):  
Irina Radulescu ◽  
Alexandru Radulescu
Keyword(s):  
Business Models ◽  
Economic Trend ◽  
Business Practices ◽  
Development Education ◽  
Sustainable Business ◽  
Sustainable Technologies ◽  
Mechanical Field ◽  
Online Sales ◽  
Entrepreneurial Training ◽  
The University

The European Commission has published in 2020 the SMEs Strategy for a Sustainable and Digital Europe that aims to increase the number of SMEs engaged in sustainable business practices, as well as the SMEs number that use digital technologies. Important opportunities for SMEs can be provided by digitization, to improve the production processes efficiency and the ability to innovate products and business models, by using advanced disruptive technologies. Good management is needed for a successful SME, education and entrepreneurship training have the role of consolidating business knowledge and skills. Educational activities and skills upgrading are essential for all SMEs managers and employees. Romania is on the last place in EU, regarding SMEs number and it ranks 11th place out of 28, in terms of connectivity. Regarding the digital maturity of Romanian SMEs, the White Papers on Romanian SMEs presents their main working elements: computer, e-mail applications, internet, intranet, social networks, the company's own website, online sales / purchases transactions. The objectives of the Bachelor's degree specialization of Economic Engineering in Mechanical field and Industrial Entrepreneurship Master are students training and education, in order to be able to sustain digitization and sustainable technologies. The university curriculum and the educational disciplines offered by the Economic Engineering in Mechanical field specialization and Industrial Entrepreneurship Master is connected to the society requirements and must follow the economic trend, by educating, training and getting good specialists. Keywords: SMEs development, education, entrepreneurship

scholarly journals Finite element analysis of soft foundation treatment by thermal drainage consolidation of group well

2020 ◽  
Vol 198 ◽  
pp. 03025
Author(s):  
Kang Le ◽  
Zhang tingjun ◽  
Tong Junhui ◽  
Chen Di ◽  
Qian Baoyuan
Keyword(s):  
Finite Element ◽  
Model Test ◽  
New Technology ◽  
Element Model ◽  
Element Analysis ◽  
Mechanical Field ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Consolidation Effect ◽  
The Finite Element Model

Thermal drainage consolidation method is a new technology of soft foundation treatment, which involves the coupling of thermo-hydro-mechanical field, and the action mechanism is complex. In this paper, taking the model test of thermal drainage consolidation as the prototype, the finite element model of thermal drainage consolidation is established by using Abaqus software, then, the numerical results are obtained and are compared with the results of model test, and the reliability of the numerical model is verified. The results show that when the applied load is constant, the higher the temperature is, the faster the consolidation speed of soil is, but with the increase of temperature, the consolidation effect of the same temperature difference will gradually weaken. In addition, the thermal drainage consolidation method can achieve the best treatment effect when the temperature of the soil reaches 60 ℃.

scholarly journals Toward Deterministic Switching in Ferroelectric Systems: Insight Gained from In Situ TEM

2015 ◽  
Vol 21 (S3) ◽  
pp. 1347-1348
Author(s):  
James Hart ◽  
Michael Jablonski ◽  
Andrew Lang ◽  
Anoop Damadoran ◽  
Shi Liu ◽  
...  
Keyword(s):  
In Situ Tem ◽  
Deterministic Switching

Dissipative Forced Intrusion Of Water In Hydrophobic Porous Silica: A New Field of Applications For MCM-41 Type Materials

2002 ◽  
Vol 726 ◽  
Author(s):  
Benoit Lefevre ◽  
Pierre F. Gobin ◽  
Thierry Martin ◽  
Anne Galarneau ◽  
Daniel Brunel
Keyword(s):  
Energy Dissipation ◽  
Mesoporous Materials ◽  
Porous Silica ◽  
Mechanical Field ◽  
New Type ◽  
Highly Hydrophobic ◽  
Materials Behavior ◽  
Mcm 41

AbstractRecently microporous and mesoporous materials were found to be particularly suitable for a new type of applications in the mechanical field. This paper reports experimental features about the dissipative forced intrusion of water in highly hydrophobic mesoporous materials: this phenomenon can be used to develop a new type of dampers and/or actuators. Silica-based materials behavior was investigated. Among them, MCM-41 exhibit original and interesting properties towards the potential developments of dampers and appear to be of great interest for the comprehension of energy dissipation mechanisms.

A novel local radial basis function collocation method for multi-dimensional piezoelectric problems

2021 ◽  
pp. 1045389X2110572
Author(s):  
Amir Noorizadegan ◽  
Der Liang Young ◽  
Chuin-Shan Chen
Keyword(s):  
Radial Basis Function ◽  
Collocation Method ◽  
Basis Function ◽  
Shape Parameter ◽  
Piezoelectric Medium ◽  
The Finite Element Method ◽  
Mechanical Field ◽  
Radial Basis ◽  
2D And 3D

The local radial basis function collocation method (LRBFCM), a strong-form formulation of the meshless numerical method, is proposed for solving piezoelectric medium problems. The proposed numerical algorithm is based on the local Kansa method using variable shape parameter. We introduce a novel technique for the determination of shape parameter in the LRBFCM, which leads to greater accuracy, and simplicity. The implemented algorithm is first verified with a 2D Poisson equation. Then, we employed LRBFCM in a numerical simulation for 2D and 3D piezoelectric problems involving mutual coupling of the electric field and elastodynamic equations for mechanical field. The presented meshless method is verified using corresponding results obtained from the finite element method and moving least squares meshless local Petrov–Galerkin method. In particular, the 2D piezoelectric problem is verified with an exact solution.

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