By means of partially ionized MBE (PI-MBE), n⁺/p silicon solar cells have been fabricated. The surface layer epitaxially grown on a p-type bulk silicon substrate (p_s0.540.0 ohm-cm) could be heavily doped (p1.01.0^-3 ohm-cm; 5.010¹⁹ cm^-3 carrier concentration) using As with the substrate temperature higher than or equal to 700. The cells were evaluated with IV characteristics under AM1 illumination and spectral responses obtained by a computer aided proofreading method. It has been found that the cell conversion efficiency η and the fill factor F. F. are 11.012.0% and 0.700.75, respectively.

The Horn set is the set of Horn clauses. The Horn clause is the set of literals which contains at most one positive literal, where a positive literal means a literal without negation sign. The satisfiability problem of the Horn set in propositional logic is one of P-complete problems, although the satisfiability problem of the formula in propositional logic is one of typical NP-complete problems. In propositional logic, unit and input resolutions, proposed by C. L. Chang, are complete inference rules used to detect the satisfiability of the Horn set. In this paper, we formulate a Restricted Linear (RL) deduction, extending unit and input resolutions. The RL deduction is formed by layering linear deductions each of which corresponds to an input resolution refutation, and is called by another name, a Linear Layered Resolution deduction based on Input resolution (an LLRI deduction). Next, we formulate a Nonlinear Layered Resolution deduction based on Input resolutions (an NLRI deduction). By means of the LLRI and NLRI deductions, we propose some classes of extended Horn sets in propositional logic for which the satisfiability problems are solvable by LLRI and NLRI deductions in deterministic polynomial time; and, thus, so are P-complete. Also we propose algorithms to determine whether a given set of clauses is in the proposed classes of extended Horn sets.

The mechanisms of the conventional spring driving types of the wire dot print heads having been studied, a new mechanism is proposed. The new mechanism is designed on the principle of the center of percussion of a body, and has the merits of good characteristics and low cost. In order to design the new mechanism reasonably, the collision vibrations are analyzed by the wave equation. It is shown in the analysis that impact printing characteristics of the new mechanism are determined by three parameters: printing medium stiffness, armature stiffness and mass ratio of the armature to the wire. The design targets are also represented by these three parameters. The relation between the center of percussion and the center of rotation of the armature is clarified on a standpoint of the collision vibration. This analysis can be applied to various mechanisms of wire dot print heads. Calculated results agree with experimental results. The new mechanism was proved to be much better than that of the conventional leaf spring by experiments.

An investigation is made of the performance characteristics of frequency-division multiplexed transmission of TV signals using both electronic and optical power combining. Intensity-modulated light sources and avalanche photodiode detectors with optimized gains are considered. The allowable transmission loss, inter-repeater spacing and total transmission distance are investigated. Optical combining becomes more advantageous as the number of transmitted channels is increased. This technique might allow the use of optical analogue IM transmission in trunk line applications.

The T88000 is a 16 bit microprocessor realized by the use of silicon-on-sapphire (SOS) LSI technology. SOS technology and architectural innovations, such as pipelining, prefetch buffering, 2-port register file, barrel shifter, multiplier etc., are key T88000 features.

The improvement made by the scanning diversity reception on the cochannel interference performance of a digital FM land mobile radio is analyzed in the Rayleigh fading signal environment. The results are verified by the laboratory simulation test.