Development of Instruction Model by FATAC Model on Electromagnetic Field and Wave for Electrical Engineering Program

2014 ◽  
Vol 931-932 ◽  
pp. 1477-1481 ◽  
Author(s):  
Alongorn Promtee ◽  
Churairatchinda Akkanit
Keyword(s):  
Electromagnetic Field ◽  
Wave Propagation ◽  
Electromagnetic Wave ◽  
High Efficiency ◽  
Electrical Engineering ◽  
Cognitive Learning ◽  
Learning Theories ◽  
Engineering Program ◽  
High Level ◽  
Instruction Model

This research aims to develop instruction model using cognitive learning theories on electromagnetic field and wave for undergraduate of electrical engineering program. The new instruction model called FATAC model was developed. It consists of 5 steps as; 1) Find 2) Adjust 3) Teach 4) Actions and 5) Conclusion. The content of dissertation has 3 Units; 1) Maxwell equations and electromagnetic wave are direct variation with time 2) Microwave planar and 3) Poynting vector and wave propagation. Thirty students of level 3 in technical education, rajamangala university of technology isan, khonkaen campus were a sampling group. Tools of dissertation included lesson plans, learning media as powerpoint presentation, electromagnetic wave propagation simulation program, wave propagation demonstration set, and filed strength meter. The research results consisted of; 1) The opinion on the FATAC model was high level (=4.21,S.D.=0.48). 2) The learning effectiveness of the instructional model was 76.15/76.73 (higher than 75/75 of the hypothesis). 3) The quality of instruction package by experts was high level (=4.27 ,S.D=0.62) and 4) The mean of satisfaction of the sampling group was high level (=4.23 ,S.D=0.57). Therefore, in conclusion, instruction model using cognitive learning theories on electromagnetic wave and propagation for undergraduate of electrical engineering program can be applied for electromagnetic theory subject and high efficiency.

Quantum description of microwave passive circuits

1990 ◽  
Vol 68 (10) ◽  
pp. 1122-1125 ◽  
Author(s):  
Nicolae Marinescu ◽  
Rudolf Nistor
Keyword(s):  
Electromagnetic Field ◽  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Potential Barrier ◽  
Cutoff Frequency ◽  
Guided Wave ◽  
Wave Guide ◽  
Quantum Mechanical ◽  
Microwave Cavities ◽  
Guided Wave Propagation

The paper gives a formal analogy between the distribution of the electromagnetic field in a wave guide and microwave cavities and the quantum-mechanical probabilities distribution. We show that the wave guide of the cutoff frequency ωc acts on an electromagnetic wave as a quantum potential barrier [Formula: see text]. We also establish a nonhabitual time-independent Schrödinger equation that replaces Maxwell's equations in describing guided wave propagation.

Quantum Features of Microwave Propagation in a Rectangular Waveguide

1990 ◽  
Vol 45 (8) ◽  
pp. 953-957 ◽  
Author(s):  
Nicolae Marinescu ◽  
Rudolf Nistor
Keyword(s):  
Electromagnetic Field ◽  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Probability Distributions ◽  
Guided Wave ◽  
Quantum Mechanical ◽  
Microwave Propagation ◽  
Microwave Cavities ◽  
Guided Wave Propagation ◽  
Mechanical Probability

AbstractThe formal analogy between the distribution of the electromagnetic field in waveguides and microwave cavities and quantum mechanical probability distributions is put into evidence. A waveguide of a cut-off frequency ωc acts on an electromagnetic wave as a quantum potential barrier Ug = hωc. A non-habitual time independent Schrödinger equation, describing guided wave propagation, is established

scholarly journals The YadA Protein of Yersinia pseudotuberculosis Mediates High-Efficiency Uptake into Human Cells under Environmental Conditions in Which Invasin Is Repressed

2002 ◽  
Vol 70 (9) ◽  
pp. 4880-4891 ◽  
Author(s):  
Julia Eitel ◽  
Petra Dersch
Keyword(s):  
Extracellular Matrix ◽  
Mammalian Cells ◽  
Yersinia Pseudotuberculosis ◽  
High Efficiency ◽  
Environmental Parameters ◽  
Infection Process ◽  
Nutrient Concentrations ◽  
Integrin Receptors ◽  
Uptake Process ◽  
High Level

ABSTRACT The YadA protein is a major adhesin of Yersinia pseudotuberculosis that promotes tight adhesion to mammalian cells by binding to extracellular matrix proteins. In this study, we first addressed the possibility of competitive interference of YadA and the major invasive factor invasin and found that expression of YadA in the presence of invasin affected neither the export nor the function of invasin in the outer membrane. Furthermore, expression of YadA promoted both bacterial adhesion and high-efficiency invasion entirely independently of invasin. Antibodies against fibronectin and β1 integrins blocked invasion, indicating that invasion occurs via extracellular-matrix-dependent bridging between YadA and the host cell β1 integrin receptors. Inhibitor studies also demonstrated that tyrosine and Ser/Thr kinases, as well as phosphatidylinositol 3-kinase, are involved in the uptake process. Further expression studies revealed that yadA is regulated in response to several environmental parameters, including temperature, ion and nutrient concentrations, and the bacterial growth phase. In complex medium, YadA production was generally repressed but could be induced by addition of Mg2+. Maximal expression of yadA was obtained in exponential-phase cells grown in minimal medium at 37°C, conditions under which the invasin gene is repressed. These results suggest that YadA of Y. pseudotuberculosis constitutes another independent high-level uptake pathway that might complement other cell entry mechanisms (e.g., invasin) at certain sites or stages during the infection process.

Sign in / Sign up

Export Citation Format

Share Document