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We study free vibrations of a circular AT-cut quartz resonator using the two-dimensional scalar differential equation by Tiersten and Smythe in conjunction with COMSOL. Resonant frequencies and mode shapes are obtained and compared with available experimental results as well as available analytical solutions of the scalar equation. The accuracy of various analytical solutions is examined.
The present paper describes the strategies used to compile and teach an Informatics course developed during last years at Tallinn University of Technology. The strategy is based on the main principles of blended learning and the analysis of the results of experiments with students from different faculties. Various tests were carried out to identify students' levels of knowledge and preferences in...
Under the new technical condition, the promotion of equipment complexity and high-tech features makes a significant increase in the workload of equipment support. Commands of support organizations become more complex. In order to meet these demands, the equipment support system has gradually evolved to the network structure. Network-centric equipment support system will become the development trend...
An e-learning system is increasingly gaining popularity in the academic community because of several benefits of learning anywhere, anyplace and anytime. In the hands of well-trained educators, e-learning technologies can offer powerful new solutions for teaching and learning. The FLIP classroom is the latest learning model now slowly making inroads into the teaching and training in India. This paper...
Development of the educational technology in field of the engineer's training have received great attention in recent years. The new information technology will significantly improve the methods of technical discipline teaching and thus level of the engineering students. This paper describes the results of IT using for virtual course creation and presents the structure of multimedia laboratory course...
Human capital is the foundation of regional economy sustainable development. And the potential human capital is the basis of human capital, so the potential human capital for the development of the region economy also has positive influence. The article, based on the number of college graduates as the proxy variable, verifies the effect that the potential human capital on regional economic growth...
An effective role of concept mapping in teaching, learning, and assessment in Power Electronics is described. It is shown that the concept maps are a suitable tool to support teachers in promoting students' comprehension of the contents of learning material and improving their understanding of new concepts. This technique helps students to see what they have acquired from the classes. It develops...
The purpose of this paper is to use Grey Relational Analysis (GRA) combined with Analytic Hierarchy Process (AHP) for choosing an English coursebook in the university. First of all, 12 English teachers were interviewed, and the elements of English coursebook were introduced. Next, the proposed GRA combined with AHP method is applied to analyze the importance of coursebook elements. Finally, the results...
The rapid development of the electrical and electronic products (EEPs) market in recent years has created both positive and negative impacts on the environment and humans. In order to achieve sustainable development, the most critically negative impacts – i.e., waste EEP (WEEP) — must be properly handled, such as disposal, remanufacturing, recycling, reusing, to name a few. Among the suggested solutions...
Through the analysis of the traditional training course evaluation problems, with multiple intelligence theory as the basis, build the training course comprehensive evaluation system. Calculate each index weight with the analytic hierarchy process (AHP) of the fuzzy mathematics, judge matrix and calculate fuzzy comprehensive evaluation index through the establishment of multi-grade fuzzy comprehensive,...
Gas transmission station is an important part of transmission system. How to effectively reduce the pressure loss inside the station and improve the transmission efficiency has become one of hotspots that pipeline operating companies pay much attention to. Sequential modular approach is proposed to realize the connection between devices and achieve a whole gas transmission station process simulation...
This paper firstly introduced the characteristic of viscoelasticity damping material and two kinds of damping structure, Secondly it studied the result of vibration control by cantilever beam which is pasted with the viscoelasticity damping material, The result certified that after pasted with the viscoelasticity damping material, The effect of vibration control is remarkable, At last it emulated...
High-concentration anaerobic fermentation of cow manure was investigated using anaerobic batch reactors under laboratory conditions at 20 °C. The quadratic orthogonal rotational combination design was employed. The influencing law of the temperature, the liquid concentration and retention time on prop ionic acid content was explored. The ranges of temperature, liquid concentration and retention time...
Three-dimensional isothermal flow fields of rigid polyvinyl chloride are calculated under different wall slip conditions in the metering section of the twin-screw extruder by using the evolution technique in POLYFLOW. The relationship between the shear stress at the screw wall and the slip velocity of the flowing melt obeys Navier's linear law. Calculations show that the differences in velocity, pressure,...
The annual mean temperature is very low in high cold region of china. The insulating and heating measures on the basis of the energy requirement analysis of biogas project are needed to ensure the normal running of fermentation process. In this paper, the heat calculation about a large-scale biogas fermentation system of Heilongjiang province was done according to the basic principles of engineering...
Teaching material sharing networks (TMSN) may enrich teachers teaching capacity and quality through sharing. To effectively manage a network and its evolution, managers have to characterize members' behaviors such as joining/leaving the network (membership) and uploading/downloading teaching materials (sharing) and network state dynamics of membership, teaching material (TM) quantity and quality....
MINDSET (Mathematics INstruction using Decision Science and Engineering Tools) is a multiyear project involving collaboration between engineers, educators, and mathematicians at three universities in two states. Through a partnership with secondary teachers, the MINDSET project staff has created a ground-breaking new mathematics curriculum for fourth-year high school students using mathematical-based...
The paper presents the application of an Excel spreadsheet as an educational tool for the beam bending calculations. It describes the advantages of using the spreadsheet in engineering education. It also describes the spreadsheet which uses Macaulay's method for beam calculations. The spreadsheet can be applied to both statically determined and indeterminate beams. It calculates the reactions (both...
The paper is focused on studies of chaotic phenomena in a fractional order non-linear circuit representing an electrochemical reactor. The various forms of reactor characteristics are investigated and the resulting circuit states are analyzed. Strange attractors are revealed, documented and presented.
The 21st century is the information age, along with the development of network technology and e-commerce, online shopping gradually replacing the traditional mode of shopping and become a new channel. How to stand out in many sites, how to attract online consumers to produce buying behavior? All these requirements need the e-marketing support. Thus, social traditional and material marketing model...
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