Masao Kinoshita

Dural arteriovenous fistula mimicking leukoencephalopathy.

K. Ikeda, MD, PhD, Y. Iwasaki, MD, M. Osako, MD, Y. Ichikawa, MD, M. Kinoshita, MD, Tokyo, Japan A 49-year-old man had headache and fever for 1 month. Neurologic examination showed cognitive dysfunction: recent memory loss, dyscalculia, and disorientation. Muscle stretch reflexes were increased with Babinski signs. Sensory …

On the Results of measuring Shaft-Horsepower and Torsional Vibration of Diesel Engines

This paper gives the results of measuring-shaft-horsepower and torque-fluctuation of the intermediate shaft with the magneto-striction type torsionmeter, which is a partly improved one of the shaft-horsepower-meter previously reported.The principal results obtained are summarized as follows:1. The value of shaft-horsepower measured with this new torsionmeter on the sea trial coincides not only with the value calculated from the indicated-horsepower simultaneously measured but also with the model basin prediction when it is standardized.2. The stress on the intermediate shaft due to the torsional vibration is not so large at the usual condition.

On the Process of Improving the Shaft-Horsepower Meter

The authors have reported in 1951, on a system of indicating shaft-horsepower with a wattmeter to which an electric type torsionmeter and an electric tachometer are connected. Since then, further researches have been made with the intention of consummating the shaft-horsepower meter, especially we made our efforts to the simplification of its control, the maintenance of its accuracy, and the diminution of its cost.In this paper, the progress of researches made on improving the shaft-horsepower meter is reported.

On the Measurement of the Stress Distributions induced on the Hull oI a Vessel during her Launching

During the launching of a ship, a large sagging moment nearly equal to the maximum one which will be experienced throughout her life is induced. Availing themselves of this chance, the authors have measured the stress distributions and the stress concentrations induced on the several parts of her hull such as transverse sections, hatch corners, expansion joints, under deck girders and so on.Genie, Christina, Nikko-maru, Yamazato-maru and Taiyu-maru were chosen as the experimental vessels.The electric wire resistance strain gauge equipments which were researched and manufactued by the authors have been used in all cases of the experiments.In this report the results of the measurement and brief considerations on them will be described.

On the Effects of an oblique, non-uniform, and Circular Flows to the Propellers upon the Manoeuverability and the Trim of a Twin-Screw Vessel

Marine propellers, being operated in the wake of a vessel, are subjected to the forces and moments of every kind. This paper deals with the theoretical treatise of this probem with an approximation after the manner of Mr. H. Glauert. Consider a right handed propeller and choose the system of axes shown in Fig. 1, The xis of x is taken forward along the axis of rotation, the axis of y to the left, and the xis fz upwards. Let OP represent one blade of the propeller at an angle ψ from Oy, and let the speed of advance and the angular velocity of the propeller be V and Ω respectively, For a propeller of a twin-screw vessel, the flows as follows must be taken into account besides the uniform axial one.(i) Velocity v along the axis of y......δΩ=usinψ/r, δV=0.(ii) Non-uniform flow of the direction of the axis of x varying along the axis of y, h=w2-w1/2(1-w)V......δΩ=0, δV=hr/Rcosψ(iii) circular flow around the axis of x, {rotational flow, ......δΩ=ω, irrotational flow, ......δΩ=f/r2, where w1 and w2 are the wake fraction at ψ=0 and ψ=π respectively, w is the mean wake fraction over the propeller disc, and r=√y2+z2, f=Γ/2π, Γ is the cyclic constants. Let the components of the inerements of the resultant force and moment experienced by the propeller be δX, δY, δZ and δL, δM, δN respectively, then these values may be expressed as shown in the following table. In this table T and Q are the thrust and torque of the propeller in uniform axial motion respectively, and R is the radius of the propeller.Δ1 and Δ2 denote the differential operators defined by the equations Δ1=1-1/2J∂/∂J, Δ2=J/2∂/∂J respectively, A1 and A2 are the coefficients expressed asA1=lnπ22+J22/J2/1-J2/π2lnπ2+J2/J2, A2=1/{21-J2/π2ln (J2+π2/J2)}-J2/π2and J is speed coefficient.The authors apply the above results to the case of a twin-screw vessel, and obtain the forces and moments experienced by the vessel. Furthermore, they make a numericalr calculation for the case of full speed sailing of the train ferry-steamer “Ishikari-Maru” of the Aomori-Hakodate line as an example.

Application of the Developable Surface to a Part of the Shell Plating of a Moderate Speed Vessel

Aiming at the simplification of the process in working-up the shell plating of a vessel, the authors investigate the possibility in applying the developable surface-especially the tangent surface-to the forward and after parts of the shell plating, and sacceed in obtaining a general method to get proper lines of a simplified hull form satisfying requirements in W. L. and prismatic curves for the loaded condition. Such a new simplified hull form is expected not only to save time, labour and cost in shipbuildig but also to keep excellent characters in resistance, propulsion and seaworthyness. An example of such a simplfied hull form and the results of towing experiments at the model basin are shown in detail.