1011 research outputs found
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The Characteristics of Electrode-less Lamp's Plasma
Get PDFpublisherAlmost fifteen years have passed since the electrode-less lamp was put on the market. Some kinds of the electrode-less lamps have been developed from some companies. The trends in the development are to get the higher lumen output and to operate this lamp at lower frequency. These two things are not conflicting, because for getting higher output it is necessary to increase the input power. As the result, the circuit efficiency should be increased. In this situation it is considered to be important to grasp how the plasma performance depends on the operating frequency, and the research for this purpose has already held by Prof.Watanabe[1]. However, the research regarding the electron temperature and so on for this purpose has not reported yet. The purpose of our research is to grasp the relationship of the characteristics of the electrode-less lamp's plasma, namely the induced coupling plasma, to the operating frequency. The results are as follows;
(1) The starting situations depend on the operating frequency was checked.
(2) The measurement system was built up to check the plasma characteristics of electrode-less lamp operated at 13.56MHz and at around 150kHz.
(3) The relationship between electron temperature and operating frequency was checked.departmental bulletin pape
Effect of Biogas Composition on HCCI Engine Performance
Get PDFpublisherTo improve the exhaust gas quality and thermal efficiency, Homogeneous Charge Compression Ignition(HCCI)Engine is regarded as the next generarion engine. However, the control of autoignition is difficult because they are controlled by chemical kinetics of fuel-air mixtures. In this study, combustion characteristics of Biogas in a HCCI Engine are investigated by chemical kinetics computations. Biogas(CH4:CO2=60:40) mixtures are prepared with equivalence rations ranging from 0.2 to 0.6. After that, the blend ratio of CO2 is changed from 20 to 60 mole % in CH4 to elucidate the effect of fluctuations in biogas composition. As a result, it is clarified that autoignion timing and combustion duration are affected by fluctuations in fuel composition. Moreover, there are distinct differences in the exhaust gas quality and thermal efficiency.departmental bulletin pape
Diffusion of the Liquid Phase using the Partial Melting
Get PDFpublisherMelt-processed YBa2Cu3Oy(Y123) superconductors are highly attractive for bulk applications, such as strong superconducting bulk magnets. Therefore, we studied basic reseach on processings of the Y123 bulk superconductors. Phase diagram shows a peritectic point at about 1010℃ where Y2BaCuO5(Y211), a liquid and Y123 coexist.
We fabricated the bulk superconductors to put the Y123 Bulk between the Y211 bulks. As the result, we could have the Y211 film in the Y123 bulk suoerconductor to moving a liquid phase using the partial melting. And the Y123 films obtained on the Y211 bulk by a peritectic reaction.departmental bulletin pape
Pressing Issues over Special Residing after Closing Dormitory
Get PDFpublisherThe dormitory of Tsuyama College of Technology had been perfectly closed every long vacation: all the residents except foreign students had been locked out at that time. Recently various idea competitions, e.g., the robot contest, the rescue-robot contest and the solar-car race, arranged for the students of both colleges of technology and those of maritime technology, have been popular all over Japan, due to NHK TV broadcasting. Everybody knows that winning in those matches is an honor to the school, whitch will surely lead to the rise a success rate for the entrance examination and then keep the educational level in the colleges as high as before, in spite of the recent decrease in the number of junior high school pupils. Under these conditions, the school authority of Tsuyama College worked out the special residing system after closing the dormitory and decided to permit a resident to live in the dormitory even after closing it if he would prepare for such contests. The dormitory affairs committee has thus executed this system these four years, in cooperation with the teachers concerned. During this period, however, various issues over the system have come into the open. The present authors will take up those for discussion and seek the way of how this system should be developed in the future.departmental bulletin pape
Review of Experiment and Practice Program in Department of Electronics and Control Engineering
Get PDFpublisherA review of the curriculum of the experiment and practice in the Department of Electronics and Control Engineering of Tsuyama National College of Technology is presented. Importance of the experiment and practice program in technical junior college, Institute National College of Technology, is generally accepted. But it is very difficult to assemble the experiment and practice subjects for the Department of Electronics and Control Engineering which is newly introduced resently, because there is little historical background and its program contains a large variety of engineering lessons. We have investigated trends of the experiment and practice program in other Institute National College of Technology, and proposed an example of revised program of the experiment and practice subjects for the Electronics and Control Engineering course.departmental bulletin pape
An Experimental Course for Robotics focussed on capability of making machines and creativity
Get PDFpublisherIn this paper, I describe about an introduction of ROBOLAB into an experiment and a practice as a creative education. In this study, I developed Micromouse using ROBOLAB that has merits to be very easy to construct their mechanical figures and functions. Though Micromouse control(RCX) by using ROBOLAB software is not sufficient now comparing with usual methods by H8 microcomputer or PIC, I confirm that it is possible to introduce it into our educational experimental program by advancing the control method of the tested Micromouse.departmental bulletin pape
Consideration of cooperation of a JAVA/C language in network distributed environment
Get PDFpublisherRecently a lot of high-performance personal computers became connected to Internet. Line speed becomes faster and faster by usin ADSL technology. Distributed computing technologies (Grid and MPI.etc) attract attention in recent years. However, it is very difficult for us to use these technologies. We want to use these technologies more easily. We thought to use the Windows System which diffused most widely and constructed a distributed environment.
We investigated basic technology of distributed processing. As a result, we confirmed that JNI technology was very useful and convenient. JNI technology relates C language to JAVA language. We improved our distributed processing system using JNI. This paper describes a brief description of our distributed system and reports an adapting example of JNI.departmental bulletin pape
Iterated Hochschild Homology and Iterated Cyclic Homology of Minimal Models of Odd Dimensional Spheres
Get PDFpublisherThe minimal model of odd dimensional sphere S(2n-1) is a differential graded algebra Λ(α) with trivial differential, whereα＝2n-1. In this paper, we determine the iterated Hochshild homology and the iterated cyclic homology of the complex (Λ(α),0) for iterated degree l＝1,2.departmental bulletin pape
Adsorption of N2 and Ar at 77K on Graphite Burnt Off in Gaseous Phase
Get PDFpublisherBurning the natural graphite partially with gas mixture of O2 and H2O at 600℃ diminished the amount of CO2- and H2O-desorbing oxides thereon, against expections. As a result of decrease in the surface oxides that forns the walls of pores existing on the graphite samples, the specific surface as well as the pore volume has decreased. As the degree of burning off gets higher, the JE step near X=0.4 has become more prominent, and at the same time, the hysteresis between adsorption and desorption has become less prominent. The JE step corresponds to the process of formation of the second adsorption layer, and the hysteresis is due to the presence of pores. Therefor, the phenomena observed suggest that the surface thus burnt is rather homogeneous to N2 and Ar than before the treatment. Through comparing the amount of N2 and Ar adosorbed at the end of the JE step with the monolayer capacity, Vm, it should also be inferred that this burning treatment has made the mesopores on the graphite samples still more shallow than the heat treatment does.departmental bulletin pape