All issues
Successor
- IEEJ Transactions on Sensors and Micromachines
- IEEJ Transactions on Industry Applications
- IEEJ Transactions on Electronics, Information and Systems
- IEEJ Transactions on Power and Energy
- IEEJ Transactions on Fundamentals and Materials
- The Journal of The Institute of Electrical Engineers of Japan
- The transactions of the Institute of Electrical Engineers of Japan.C
- The transactions of the Institute of Electrical Engineers of Japan.B
- The transactions of the Institute of Electrical Engineers of Japan.A
Volume 46, Issue 454
Displaying 1-9 of 9 articles from this issue
- |<
- <
- 1
- >
- >|
-
H. NAGAOKA1926 Volume 46 Issue 454 Pages 445-453
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (751K) -
MASAMITI SASE1926 Volume 46 Issue 454 Pages 454-458
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe principle and some merits of a new potentiometer. which has two dials and a one-round slide wire resistanc in its measuring part, are shortly descr-ibed.
As for the advantageous properties of this instrument, the following three points are mentioned:-
(1) The total resistance is low;
(2) The resistance of the 2nd dial is of such a high value that the effect of contact resistance can be neglected;
(3) The resistance of the slide wire is low, so that it can endure long and frequent use.
The writer recommends the convenience of this instrument for general scie-ntific investigations and also for technical purposes.View full abstractDownload PDF (255K) -
GENKI SADAKIYO1926 Volume 46 Issue 454 Pages 459-475
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe resistancet of the semi-conductor is mostly characterized by their conta-cts with electrodes, and the conditions of these contacts are chiefly effected by moisture and electrical and mechanical pressure.
The charging current of the insulator is generally observed and considered as decreasing exponentially with the time of voltage application. But, in the case of semi-conductor (paper is used as the semi-coductor in these experim-ents), there are, in many cases, some irregular changes of currents, ana these irr gularities are seemed curious at a glance.
If a metal e'ectrode is used, as the positive, to flow electrie current throu h the semi-conductor, there are very, very fine particles of that metal, migrating through the medium; these fine particles may be considered as char ed or ionized molecules or atoms.
The author diseusses the phenomena, mentioned above, and gives out his view for their causes in this paper. And also proposes his new definition for ioni ation.View full abstractDownload PDF (1901K) -
M. IWATAKE1926 Volume 46 Issue 454 Pages 476-481
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIntending to measure the time lag of spark of the order of 10-4-10-5 second, the author utilized the "Rotating film method" Which is mentioned in this paper, instead of the "Dufour oscillograph method".
It can be infered from the author's present observations that:-
(1) The time lag of spark of the order of 10-4-10-5 second can be easily measured by the rotating film method.
(2) For equal gap length, the time lag of a needle gap in air is shorter than that of a sphere gap under constant surge voltage.View full abstractDownload PDF (623K) -
ISAMU YAMAMOTO1926 Volume 46 Issue 454 Pages 482-489
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe present paper is the report of the experimental results on the natural oscillation wave length of the various kinds of pancake coils wound on square frames.
It may be concluded, from our experiment, that the ratio of the natural wave length (λ0) to the total length of wire (l) is nearly determined only by the ratio of the winding (h) to the mean diameter 2r) of the col.
From the measured value of natural wave length and the self inductance at audio frequencies, the equivalent self capacity (C0) was calculated.
The natural wave length was measured under three different conditions, viz., (i) both end insulated, (ii) outer end earthed and (iii) inner end earthed, and the results are shown in curv s (I)(II).View full abstractDownload PDF (408K) -
K. OKABE1926 Volume 46 Issue 454 Pages 490-498
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis paper shows the thermionic effects caused by alminium and magnesium on the commercial tungsten filaments. The electron mission from the surface of the filaments was increased considerably by the impacts of alminium ions or magnesium ions. The nature of such filaments was studied carefully by measuring the rate of activation, the thermionic emission and the secondary electron emission from the surface of the filaments.
The filament which have never b en heated to a very high temperature during the various treatments have the extraordinary high value in the rate of activation, and the relations between the voltage and the secondary electron current from the surface are quite abnormal as are shown in Fig. 6 and Fig. 7. It is proposed here that the alminium oxide and the magnesium oxide may exist on the surface in special state with the atoms of rare metals. This state is named here "A-state".
Another state can be obtained by heating the filaments at the very high temperature. In this state, the condition of the surface is similar to those of the thoriated tungsten filaments. the manners of the secondary electron emis-sion in this state are shown in Fig. 8 and the curve III in Fig. 10. This state is named here "B-state".
The spectrum analysis of the commercial filaments which were employed in this study showed the existance of Th, Zr and the trace of Ce.
Fig. 5 B shows the rough sketch of the principal part of the apparatus for measuring the aecondary electron emission. In Fig. 5 B, α, b and c denole the filament under the test, the source of the primary electrons and the grid which absorves the secondary electrons (Vg=500 volts) correspondingly Fig. 9 shows the result obtained in the case of the special pure tungsten filament.
No distinct difference was recognized in the secondary electron emission curves which were obtained from the activated filament and the deactivated one.View full abstractDownload PDF (585K) -
MATSUJIRO OYAMA, SETSUO FUKUDA1926 Volume 46 Issue 454 Pages 499-504
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn extended-delta connection of single phase transformers, as shown in Fig. 1, we can put on simultaneous loads on two three-phase terminals of different voltage. The relation and limit of these loads for the safe operation of transf-ormers are discussed, and a few examples are calculated and shown by curves. Attention is also drawn to the fact that this connection is superior for its high permissible total Kva. output to other connections, producing two diffe-rent voltage circuits.View full abstractDownload PDF (311K) -
SADAJI MOMOTA1926 Volume 46 Issue 454 Pages 505-580
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSPart I. Introduction. It is pointed out here that the energy loss, caused by the alternating magnetic leakage flux in the tank plates, may reach an appreciable amount in the core type transformers of high voltage and large output.
I art II. Flux Distribution and Energy Loss in Steel Plate. The distribution and the method of obtaining the total quantity of the alternating magnetic flux in a steel plate are described, and the permeability ratio curves, which are useful in calculating the total flux, are given. The formulas of the eddy current loss, and of the hyste-resis loss, and the loss factor curves to be used in the calculation of these losses are obtained. The alternating magnetic flux can hardly penetrate into the interior of steel plate, and consequently the iron loss is constant in steel plate exceeding a certain value of thickness for a given surface induction and permeability.
Energy losses in steel plates of various thicknesses are calculated for varions surface inductions by the preceeding formulas and the results are given as the flux-loss curves. The losses thus calculated are compared with the losses obtained by me su-ring the losses of the steel plate cores prepared for the purpose.
Part III. Stray Load Loss. The formula for calculating the leakage flux of transformers is given; and the experiments for the distribution of the leakage flux at outside of the windings, and the method of determining the flux passing through the tank plate, and also of determining the stray load loss caused by the flux in the transformer tank are described. The experimental results are given to varify applica-bility of these calculations.
Calculation of the stray load loss per unit area of the tank plate ranging in wide extent is made and the formulas, applicable for the single phase core type transformer of high voltage and large output, are deduced.
These are
W=(13-.15A2)phφ2×10-8 for 50 cycles
W=(16.8-.2A2) phφ2×10-8 for 60 cycles
In the last part, the author's method of eliminating the stray load loss by using the magnetic shield made up of steel sheets is described with the experimental data.View full abstractDownload PDF (3536K) -
[in Japanese]1926 Volume 46 Issue 454 Pages 581-582
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (123K)
- |<
- <
- 1
- >
- >|