This paper describes the procedure for the operation of a hybrid computer which was installed in our laboratory in March of this year and an example of the application of this computer to a simple optimal control problem. In order to shorten the time of program loading and to make the correction of the program easy, the program for the hybrid computation is written in the assembler language in which the result can be obtained if the original tape is loaded once in a computation. With the hybrid computer a simple optimal control problem resulted in a two-point boundary value problem is analyzed, It is much easier to obtain the solution automatically with the hybrid computer than to seek the solution manually with the analog computer.

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The observations of the atmospheric absorption and the solar radio emission through the millimeter wave band are much required and so we produced the millimeter (50GHz) radio wave measuring system that is used for these observations. this paper is a report of this system and the results of our trial observatios. The system consists of the reflector antenna and the Dicke radiometer. The antenna is 1500mm-diameter main paraboloid with 150mm-diameter Cassegrain reflector and the 3-dB beamwidth at 6 mm is nearly 20'. The overall noise figure obtained is nearly 17-dB and the result of the traial run, the maximum sensibility is found to be nearly 5゜K when the time constant is 1 second.

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This paper is a report on the results of studies about post-tensioned unbonded prestressed concrete beams. Based on experimental and analytical studies of flexural behavior and ultimate strength of beams, the relative performances of various types of post-tensioned prestressed concrete beams are compared. Test results of 8 rectangular beams are given, involving (1) two post-tensioned bonded prestressed concrete beams using normal concrete (2) two post-tensioned unbonded prestressed concrete beams using normal concrete (3) two post-tensioned bonded prestressed concrete beams using lightweight concrete (4) two post-tensioned unbonded prestressed concrete beams using lightweight concrete. The characteristics of four types of post-tensioned beams are compared in terms of load-strain relationships, load-defiection relationships flexural rigidity, and ultimate strength of beams failing in flexure.

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In order to measure the intensity of the output power of pulsed nitrogen lasers (3371 Å), a new sensitive chemical actinometer is studied. Potassium ferrioxalate with 1 : 10 phenanthroline is used as the chemical actinometer. The average output energy of approximately 480 W per pulse has been measured. It is found that the laser output at a N2 gas pressure of 4.7 Torr seems to be most efficient. Results of a detailed investigation on relations between laser pulses and the discharge current are also reported.

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About the plan of the buffer storage which is in use of the delayed delivery, the analysis of the traffic of customer's calls is reguired. In this paper, the analysis is executed in a type with no call from a termirating line by the method of including supplementary variables and some results are shown.

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The Purpose of this study was to know the individual differences in the motion pattern of the toe point during running at maximum speed each an age bracket. Four subjects were employed in this study. (Table1) Running was performed in the light ground and the dark ground. The light-trace photographs of the tip of toe were collected by means of an ordinary camera with a telephoto-lens, and a black and white 35mm film. Moreover a stroboscope and a V. T. R. were used jointly with them and the stroboscope light-trace was interrupted every 1/30 second. A small lamp was fixed on the tip of the toe. The ypical photographs were shown in Fig. 2. From those photographs, the vertical displacement of the toe point, the duration time of one cycle (the step frequency), the step length, and the foot speed were caluculated at maximum speed of running. The results were as follows; 1. Towards older subject, the step frequency was frequent, the ratio of the step length was lengthened, vertical displacements of the toe point became larger and the motion of the foot became faster. 2. When the older subject struck his foot on the ground, the swing leg was carried more nearly towards the support leg. On the contrary, the infant subject remained his swing leg behind the body at the same instant. 3. At the instant when the toe exerted the maximum force against the ground, the older subject carried his knee joint of the swing leg upward in front of the body. But the infant subject kept his swing leg near the support leg.

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There is a great deal of complexity about tense in English Grammar. In certain cases it is very difficult to explain why a sentence has such a tense-form and in other cases the tense-form of a sentence seems to be wrong. We have tried to explain the complex 'tense' from the viewpoint of the speaker. The following problems are dealt with in detail; the present tense for the future tense in adverb clauses of time or condition, the delicate difference of meaning between the present and the present perfect and the past tenses when we express the same reality, and the progressive form and the viewpoint. We have also considered from the viewpoint of the speaker why the past form is used to express the unreality in the present or future time in the subjunctive mood.

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