Research on Layered Design of Ring-Shaped Acoustic Cloaking Using Bimode Metamaterial

2014 ◽  
Vol 687-691 ◽  
pp. 4399-4404
Author(s):  
Qian Jin Xiao ◽  
Lei Wang ◽  
Tao Wu ◽  
Zhi Gao Zhao
Keyword(s):  
Design Method ◽  
Micro Milling ◽  
Physical Parameters ◽  
Microstructure Design ◽  
Research Results ◽  
Processing Capability ◽  
Microstructure Model ◽  
Layered Design ◽  
The Relationship ◽  
Transformation Acoustics

The microstructure design of acoustic cloaking is the key to realizing physical parameters required, and it is also closely correlated with realization of such projects as processing capability. The paper investigates the layered design of ring-shaped acoustic cloaking based on BM. According to the principle of transformation acoustics and the theory of PM cloaking, physical parameters of the acoustic cloaking are offered. Further, the relationship between the parameters of each layer of BM microstructure and the physical parameters of acoustic cloaking made of BM is determined. And the layered design of the acoustic cloaking are discussed. At last, the microstructure model of the acoustic cloaking is designed, and the ultra-precise micro-milling center is adopted for trial produce, to make a sample of the acoustic cloaking. The research results provide a kind of layered design method for ring-shaped acoustic cloaking, and indicat that the acoustic cloaking is realizable in engineering.

Study on Design Method of the Microstructure for Layered and Ring-Shaped Acoustic Cloaking Based on Bimode Metamaterial

2014 ◽  
Vol 684 ◽  
pp. 219-227
Author(s):  
Qian Jin Xiao ◽  
Xiang Dong Zhang ◽  
Jia Chang Qian ◽  
Hong Chen
Keyword(s):  
Theoretical Basis ◽  
Design Method ◽  
Design Methods ◽  
Design Parameters ◽  
Physical Parameters ◽  
Theoretical Design ◽  
Microstructure Model ◽  
Analytic Expression ◽  
Layered Design ◽  
The Relationship

The paper proposes a design method for the layered and ring-shaped acoustic cloaking based on BM. According to the theory of PM cloaking, physical parameters of the ring-shaped acoustic cloaking are given by theoretical design. Further, based on the features of microstructure of BM, the relationship between the parameters of each layer of microstructure of BM and the analytic expression of the physical parameters of acoustic cloaking made of BM is determined, and the design methods for microstructure of layered and ring-shaped acoustic cloaking are discussed, namely, radial equidistant layered design and radial non-equidistant layered design (i.e. equal sectorial angle layered design). At last, according to the radial non-equidistant layered design parameters of the ring-shaped acoustic cloaking, the microstructure model of the layered and ring-shaped acoustic cloaking is designed. The results of the study can serve as theoretical basis for actual production and application of acoustic cloaking.

Academic motivation and professional skills development in the Specialty of Social Sciences and Tourism at a public university [Motivación académica y desarrollo de competencias profesionales en la Especialidad de Ciencias Sociales y Turismo de una universidad pública]

2019 ◽  
Vol 1 (2) ◽  
pp. 96
Author(s):  
Ana Cecilia De Paz Lazaro ◽  
Jessica Luz Palomino Collantes
Keyword(s):  
Social Sciences ◽  
Academic Motivation ◽  
Public University ◽  
Skills Development ◽  
Professional Skills ◽  
Research Results ◽  
Competencias Profesionales ◽  
High Level ◽  
The Relationship

The objective of the research is to determine the relationship between academic motivation and the professional skills development in the specialty of Social Sciences and Tourism. The study is quantitative and the design is non-experimental correlational translational. The results indicate that there is a high level relationship (0.914) between the independent academic motivation variable and the professional competences development in the Specialty of Social Sciences and Tourism. In conclusion, motivation is directly related to the professional skills development in the specialty of Social Sciences and Tourism. The research results conclude that there is a high relationship between the variables.

Thermodynamic and Kinetic Calculation of Non-Equilibrium Microstructure Design of TRIP Steel

2014 ◽  
Vol 783-786 ◽  
pp. 766-770
Author(s):  
Yan Lin He ◽  
Na Qiong Zhu ◽  
Wei Sen Zheng ◽  
Xiao Gang Lu ◽  
Lin Li
Keyword(s):  
Trip Steel ◽  
Equilibrium Phase ◽  
Microstructure Design ◽  
Kinetic Calculation ◽  
Software Comparison ◽  
Thermo Calc Software ◽  
Curve Determination ◽  
Equilibrium Microstructure ◽  
The Relationship ◽  
Non Equilibrium

The non-equilibrium microstructure of Fe-C-Mn-Si TRIP steel is designed bythermodynamic and kinetic calculation. The upper limit of bainitic transformation temperature iscalculated and compared to that characterized by CCT curve determination. s M temperature isdetermined based on thermodynamics of martensitic transformation and sublattice model. Thecalculation is conducted via TQ6-patch in Thermo-Calc software. Comparison between thecalculations and experiments reveals the relationship between non-equilibrium phase compositionand heat treatment parameters which can be utilized to achieve the elaborate design of alloy and heattreatment for super TRIP steel.

The relationship between physical parameters and wear of dental composites

Wear ◽  
2007 ◽  
Vol 263 (7-12) ◽  
pp. 1138-1146 ◽  
Author(s):  
S.D. Heintze ◽  
G. Zellweger ◽  
G. Zappini
Keyword(s):  
Dental Composites ◽  
Physical Parameters ◽  
The Relationship

Calculation and Design Method Study of the Coil-Wound Heat Exchanger

2014 ◽  
Vol 1008-1009 ◽  
pp. 850-860 ◽  
Author(s):  
Zhou Wei Zhang ◽  
Jia Xing Xue ◽  
Ya Hong Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchanger ◽  
Design Method ◽  
Fluid Velocity ◽  
Exchange Process ◽  
Three Dimensional ◽  
Simulation Method ◽  
Physical Parameters ◽  
Numerical Result

A calculation method for counter-current type coil-wound heat exchanger is presented for heat exchange process. The numerical simulation method is applied to determine the basic physical parameters of wound bundles. By controlling the inlet fluid velocity varying in coil-wound heat exchanger to program and calculate the iterative process. The calculation data is analyzed by comparison of numerical result and the unit three dimensional pipe bundle model was built. Studies show that the introduction of numerical simulation can simplify the pipe winding process and accelerate the calculation and design of overall configuration in coil-wound heat exchanger. This method can be applied to the physical modeling and heat transfer calculation of pipe bundles in coil wound heat exchanger, program to calculate the complex heat transfer changing with velocity and other parameters, and optimize the overall design and calculation of spiral bundles.

PRAGMATIC CHARACTERISTICS OF HUMOROUS APHORISMS IN THE CONTEXT OF LIFE SPACE

2020 ◽  
Vol 76 (4) ◽  
pp. 18-23
Author(s):  
LARISA V. Burmistrova ◽  
Keyword(s):  
Positive Attitude ◽  
Negative Attitude ◽  
The Internet ◽  
Study Guide ◽  
Life Space ◽  
Research Results ◽  
The Relationship

The analysis of pragmatic characteristics of humorous aphorisms in the context of life space. Author's humorous aphorisms of famous writers, poets, historians of the 17th, 18th, 19th centuries and modern humorous aphorisms posted on the Internet; collection of sayings, quotes and aphorisms “Big Book of Wisdom” (edited by Yuri Lavrov). The relevance of the research is determined by the interest in comic universal expressions, network discourse, comical texts. The research results are applicable when compiling a study guide for students or can be used to compile a psychological portrait of the hero of the work. The aim of the present study is to investigate the pragmatic characteristics of humorous aphorisms. It is analyzed that humorous aphorisms of famous writers, poets, historians of the 17th, 18th, 19th centuries and modern humorous aphorisms affect the main aspects of life. Pragmatic characteristics of humorous aphorisms are analyzed. It was found that the humorous aphorisms most vividly reflect the relationship and love between a man and a woman, the intellect of a woman and a man, care of women, the image of a strong, ambitious man, relationships in marriage, feelings (love and happiness), positive attitude (purposefulness, necessity of education), negative attitude (duplicity, laziness, stupidity, slight knowledge, exaggeration of material value), the contrary opinion of an optimist and a pessimist.

Minimum Energy Control of Multibody Systems Utilizing Storage Elements

2009 ◽  
Author(s):  
Werner Schiehlen ◽  
Makoto Iwamura
Keyword(s):  
Multibody Systems ◽  
Optimal Trajectory ◽  
Design Method ◽  
Equations Of Motion ◽  
Minimum Energy ◽  
Operating Time ◽  
Minimum Energy Control ◽  
Robot Systems ◽  
Optimal Design Method ◽  
The Relationship

In this paper, we consider the problem to minimize the energy consumption for controlled multibody systems utilizing passive elastic elements for energy storage useful for robot systems in manufacturing. Firstly, based on the linearized equations of motion, we analyze the relationship between the consumed energy and the operating time, and the optimal trajectory using optimal control theory. Then, we verify the analytical solution by comparing with the numerical one computed considering the full nonlinear dynamics. After that we derive a condition for the operating time to be optimal, and propose the optimal design method for springs. Finally, we show the effectiveness of the design method by applying it to a 2DOF manipulator.

Research on the Attenuation Law of Stress Wave Propagation in Concrete Media

2013 ◽  
Vol 671-674 ◽  
pp. 758-767
Author(s):  
Wei Sun ◽  
Shi Yan ◽  
Shao Fei Jiang
Keyword(s):  
Wave Propagation ◽  
Attenuation Coefficient ◽  
Polynomial Function ◽  
Piezoelectric Ceramics ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Research Results ◽  
Cubic Polynomial ◽  
The Relationship ◽  
Main Factor

This paper presents an experimental method to investigate the attenuation performance of stress waves in concrete structures embedded in piezoelectric ceramics. To get the research objective, a series of test were hold. The relationship curve between the frequency and the attenuation coefficient was fit. The calculation method for propagation distances of stress waves with constant amplitudes and frequencies in the concrete medium was proposed. The research results show that the relationship curve of attenuation coefficient and frequency conform to the cubic polynomial function approximately. The attenuation performance for the concrete structure embedded into piezoelectric ceramics is relevant to the frequency, the amplitude and the medium character, and the frequency is the main factor. The research results of this paper can provide an effective evidence for correctly placing transducers.

scholarly journals Relationship between Entrepreneurial Team Characteristics and Venture Performance in China: From the Aspects of Cognition and Behaviors

2020 ◽  
Vol 12 (1) ◽  
pp. 377 ◽  
Author(s):  
Xue-Liang Pei ◽  
Tung-Ju Wu ◽  
Jia-Ning Guo ◽  
Jia-Qi Hu
Keyword(s):  
Structural Equation ◽  
Equation Modeling ◽  
Team Cognition ◽  
Team Members ◽  
Research Results ◽  
Venture Performance ◽  
Entrepreneurial Team ◽  
Behavior Characteristics ◽  
And Behavior ◽  
The Relationship

Entrepreneurial and innovative activities are becoming a global economic and social phenomenon, especially in emerging economies. This study focuses on a typical emerging economy, China, and its entrepreneurial and innovative activities. On the basis of current research, the literature review and the chain of “cognition–behavior–outcome” are used for constructing the theoretical model for the relationship among entrepreneurial team cognition characteristics, behavior characteristics, and venture performance. A total of 101 valid copies of questionnaire are collected from entrepreneurial team members, as the research objects, and the structural equation modeling (SEM) method is applied to test the theoretical hypotheses. The research results reveal (1) significant effects of entrepreneurial team cognition characteristics and behavior characteristics on venture performance and (2) partial mediating effects of entrepreneurial team behavior characteristics on the relationship between cognition characteristics and venture performance. The research results are the expansion of research on entrepreneurial teams as well as the important reference for entrepreneurial team management and behavioral practice.

A synergy-column envelope meshing pair profile for single screw compressors

2018 ◽  
Vol 233 (4) ◽  
pp. 1383-1391 ◽  
Author(s):  
Feilong Liu ◽  
Junhao Feng ◽  
Jia Xie ◽  
Quanke Feng ◽  
Martijn Van Den Broek ◽  
...  
Keyword(s):  
Design Method ◽  
Optimal Combination ◽  
Stable Operation ◽  
Single Screw ◽  
Tooth Width ◽  
Operational Life ◽  
Column Design ◽  
Manufacturing Methods ◽  
Operation Results ◽  
The Relationship

Multi-column envelope engaging couples have been proposed for single screw compressors to reduce the friction and prolong the operational life. However, little is mentioned about the relationship between columns at opposite sides of the star-wheel teeth. An imbalance in the lubricant film forces would appear and influence the lubrication between the tooth and the groove. During a real design process, it is necessary to try several times for each different type of compressor to find the optimal combination of columns. In part, due to the large number of columns, it also makes both manufacturing processing and product testing difficult. In this paper, a synergy-column design method and its related manufacturing methods are presented. The locations and relationships of the designed columns can be prescribed by given the tooth width. Manufacturing of the rotor and star-wheel shows the new design method can be more efficient through processing. The stable operation results prove that the synergy-column envelope meshing pair can solve the star-wheel’s wear-out problem.

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