30 research outputs found
Control Circuits for Adjustable Digitally Programmed DC Power Supplies
No full textThis paper presents and compare two methods for digital output programming and regulation of Switched Mode Power Supplies. One method is based on shunt regulator TL431 emulation, while the other uses injected current into the reference resistor divider. Both methods are tested on LM3481-EVM commercial module and have shown good linearity and satisfactory control performances on output voltage regulation. Finally, control accuracy of the two methods is discussed
High-Voltage Source for SiPM Biasing with Enhanced Noise Performances
No full textThis work introduces an improved high-voltage source designed to enhance noise performance when biasing Silicon Photomultipliers (SiPMs). The system is based on a flyback regulator that adopts multiple noise-reduction methods to suppress the switching spikes generated from the DC-DC converter as an alternative to the Cockroft-Walton multiplier. Noise reduction methods are presented, and design choices are explained. A linear output regulation is included to dimmer the output and select the required SiPM breakdown voltage, and a Digital-to-Analog converter is used as a programmable reference. The proposed voltage source has been tested up to 200 V and 2 mA current load, reaching a peak-to-peak AC noise lower than 16 mV and a total RMS noise value lower than 5 mV. Performances are compared with a commercial source meter, used in several experiments as bias voltage source, showing better results
Theoretical and numerical studies on quantum hydrodynamics in superfluid ^4He : Approaches based on the two-fluid model & one-fluid extended model
No full textRead-out using F1-TDC-ADC of the newSFD X plane (and dE/dx counter)
No full textThe data of the SFD X-plane and dE/dx counter, obtained with a minimal DAQ were analyzed. Several features of the new F1-TDC-ADC device were checked. The optimal threshold settings for the future run are found to be 15 - 20 mV for X-plane, and 20 mV for dE/dx counter.5KJ00005048661P研究論文Paperdepartmental bulletin pape
Concerning Expressions in the Opening Scene of MON : The Novelist’s Techniques and Attitudes Found in Expressive Distance
No full textThis paper deals with novelist SOSEKI’s techniques and attitudes, by analyzing the sentence structure in the first scene of MON. I have used “The Theory of Expressive Distance”, Chapter 8 of the volume four of The Theory of Literature (1907, 5), and recent theories of space in linguistic expression. Two problems are clarified: (1) The author places the time of the first scene six years after the principal occurrence of the novel. (2) Even though in the first scene Sosuke, who has stolen his friend’s wife and is obsessed with a sense of guilt, begins to doubt the way he is dealing with his sin, he doesn’t act to achieve real redemption or personal salvation. The author, therefore, intervenes in Sosuke’s inner life, freely changing the special point of reference. This paper elucidates the use of these two operations, by which the author constructs the characters in the story and develops the plot.departmental bulletin pape
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Testing the Intrinsic Benefit Model of the Signaling Theory
No full textThis study proposes the intrinsic benefit model of the signaling theory for sociology. The signaling theory is a subtheory of the game theory. It was developed independently within Evolutionary Biology and Economics, and it is concerned with the communications under the situations with asymmetrical information. Although the signaling theory have been widely adapted across social science, its influence within Sociology has been limited so far. This study proposes the argument that the signaling theory can achieve the increased relevance within Sociology by focusing on the role of (perceived) intrinsic benefit obtained from the signal production. The focus on the intrinsic benefit would allow the signaling theory to be applied on the broader range of phenomena which are of sociological interests, while at the same time analytically integrating additional social and symbolic contexts of the signals. Based on this argument, the propositions were developed about the role of the signal visibility and the intentionality of the signal. The three experiments were conducted to test the propositions. The two vignette experiments were conducted to test the effect of signal visibility on the signaling of environmental commitment through the purchases of electronic vehicles. A laboratory experiments was conducted to test the effect of the intentionality of the signal on the signaling of trustworthiness through donations. The first experiment gave the strong support to the propositions, whereas the second and the third experiment produced the mixed results. The author suggests that the overall findings are consistent with the main argument underlying the intrinsic benefit model
The drama "Yoshitsune and the thousand cherry trees." Minamoto No Yoshitsune as a martial strategist, courtier and literary myth.
No full textIn her doctoral thesis the author would like to present the play Yoshitsune and the Thousand Cherry trees (Yoshitsune senbonzakura) as a unique piece of Japanese drama which has a great complexity and an outstanding place within the corpus of Japanese literature. Even if the play can be compared to Chushingura mono in its importance, Yoshitsune senbonzakura has not been widely translated to western languages. There are two exceptions, however: the English translation (Jones, Jr. 1993) and the German translation (Klopfenstein 1982). While comparing the two translations and using the most full original texts available (as preserved in Takeda Izumo and Namiki Sosuke Joruri Collection and Yuda Yoshio's Bunraku Joruri Collection), the author's goal is to present the play to Czech readers and its interpretation to Czech scholars. As for the flow and structure of the interpretation of Yoshitsune senbonzakura the author begins with the historical background of the legend of Minamoto Yoshitsune, capturing the life of Yoshitsune from the time of Heiji rebellion (1159) when he was born to his death in 1189. Next the author concentrates on the legend itself as it evolved within the course of Japanese literature. With a shift from the court literature of Heian period towards the battlefield stories and..
Interactive combustion of two-dimensionally arranged quasi-droplet clusters under microgravity
No full textTo investigate the mutual interactions between droplets in the spray combustion, combustion of 2-dimensionally arranged quasi-droplet clusters is studied under microgravity. Quasi-droplet samples, which are solid in room temperature and change into liquid just after the ignition, consist of alcohol (propanol, butanol, pentanol, or hexanol) and polyethylene glycol with a volumetric ratio of 2:1. Seven samples sustained by glass rods form a 2-dimensional quasi-droplet cluster. Electrically heated nichrome wires ignite all samples in the cluster simultaneously. Single envelope flames that surround the clusters appeared. The results show that the sample spacing has a strong effect on the shape and movement of the flame. Sample clusters with large sample spacings come to the external group combustion through the scavenging combustion mode, whereas the small spacing clusters start directly with the external group combustion. At large sample spacings, the distance from the edge of the sample cluster to the flame (flame distance) increases to a maximum value and then decreases with time. The period of flame growth is prolonged with decreasing sample spacing and finally, at a small enough sample spacing, the flame distance keeps increasing until the flame disappears. This flame movement is attributed to the fuel vapor accumulation effect, which becomes more dominant with decreasing sample spacing. The burning lifetime decreases monotonically and approaches the value of the single flame with increasing sample spacing. The flame distance decreases monotonically and approaches the single flame radius with increasing sample spacing also. These results render important confirmations of the external group combustion phenomena and prove the importance of the two kinds of unsteadiness, i.e., the scavenging combustion with large droplet interval and the fuel vapor accumulation effect with small droplet interval, in group combustion.Copyright © 2002 The Combustion Institute
Evaluation of Prosthesis Test as a Preoperative Examination Method for the Sound Conductive System
No full textWith the prupose to foreknow the condition of ossicles and, if possible, the hearing level attainable by tympanoplasty, prosthesis test was carried out preoperatively on 110 cases of chronic otitis media, and these results were compared statistically with the findings of the surgery and the postoperative hearing acuity. As to the prosthesis, thin patch paper or small rubber bag was employed to cover the drum perforation closely. And puretone audiometry was conducted with and without the prosthesis. The results obtained were as follows; 1) The data were investigated in each of two groups, one with disconnected ossicles, the other intact. Thereby, following two criteria were introduced, i.e. the improved hearing level better than 20 db loss or the gain of hearing more than 15 db with prosthesis. Using these criteria, the author considered, the condition of ossicles could be surmised. That is, in cases within the criteria it might be possible to diagnose that the ossicles are intact. And in the other cases without he criteria, the continuity of ossicles would be indefinite. 2) In addition, findings of the prosthesis test and hearing test after tympanoplasty were compared, an it was suggested that the prosthesis test could offer a clue to estimate possible gain of tympanoplasty
