InSb MOS structures fabricated by a novel thermal oxidation method

Interfaces between InSb and its native oxide grown by a novel thermal oxidation method have been clarified to have good electrical characteristics. The interface state density was of a V-shaped form with the minimum value of less than 1012/cm2 eV, and the field-effect mobility of the holes at 77 K was about 300 cm2/Vs.     

Description and Reasoning of VLSI circuit in temporal logic

This paper presents a method for describing and reasoning about the behavior of VLSI circuits within the framework of Extended Temporal Logic. For a reasoning method, an “ω-graph approach” is proposed which is useful in verifying the validity of a design. Not only verification but also other reasoning about circuit properties, such as unknown signal identification, can be treated in a unified way by this ω-graph approach. This approach has been studied as a basis of an expert system for the authors’ VLSI CAD system.     

Chromatic induction as a function of wavelength of inducing stimulus

Induced chromatic effects were determined for monochromatic, equal-luminance inducing stimuli from 460 to 680 nm by using a hue-cancellation procedure. The observed red-green-and yellow-blue-induced chromatic-response functions, which were different from the prediction based on the opponent-color hypothesis, could accurately explain the characteristics of the simultaneous color contrast effect. Good linear fits were obtained for the red-green function with a linear combination of R and G cones and for the yellow-blue function with a linear combination of R and B cones. These findings suggest that the opponent mechanisms for color contrast may be different from those for homogeneous color.     

Breakup of non-newtonian emulsion jets

The breakup of non-Newtonian emulsion jets into drops was experimentally studied by ejecting both O/W and W/O emulsions vertically downward into stagnant air through nozzles. Breakup lengths of non-Newtonian emulsion jets were found to be almost equivalent to those of Newtonian jets. Experimental breakup data establish that the static surface tension of the oil phase can be used as the surface tension of W/O emulsion jets, whereas the dynamic surface tension of aqueous surfactant solutions is used as that of O/W emulsion jets. Diameters of drops formed from non-Newtonian emulsion jets are in good agreement with the prediction from the stability theory previously developed by the authors. When the rheological index in a power law model is appreciably smaller than unity and the Ohnesorge number is significantly large, however, drop sizes are larger than the prediction because of the profile relaxation in jets. The critical velocity of emulsion jets, either O/W or W/O emulsion, is significantly lower than that of homogeneous Newtonian jets.     

New approach to the frequency response analysis of an InGaAsavalanche photodiode

The frequency response of an avalanche photodiode has been calculated by solving the transport equations, taking the electric field profile into account. The relationship between the carrier concentration (Nb) in the multiplication layer and the frequency response has been obtained for the first time. This calculation has been carried out for a conventional In_0.53Ga_0.47As avalanche photodiode. The results explain well present experimental data. The saturation velocity of holes in InP is estimated to be 2×10⁶ cm/s. The upper limitation of the gain-bandwidth product is estimated to be 140 GHz at Nb=2×10¹⁷ cm^-3      

Light modulator using piezoelectric films with waveguides

A light modulator using piezoelectric films based on optical interference of the Mach-Zehnder type has been proposed and demonstrated. The modulator is constructed with two optical waveguides joined to each other at both ends to divide the incident light and to recombine them, and each waveguide is fabricated on a polyvinylidene fluoride (PVDF) film to serve as a voltage-driven phase-shifter.     

Studies on constituents of medicinal plants. XVI. The constituents of Spiraea species (author''s transl)

A rare case of downward displacement of the left kidney caused by marked development of an ectopic ovarian cyst in the left subphrenic region is presented. Exact diagnosis could not be made preoperatively but a satisfactory result was obtained by removal of the cyst. Histological diagnosis of the tumor was serous cystadenoma arising from the left ovary.