Abstract: A tread unit of a passenger conveyor includes: a tread, a tread reinforcing member and a riser which are made of fiber reinforced plastic made by knitting fibers together. The surfaces of the cleat portions of the tread and the riser are provided with surface treated layers in which the wear resistance and coefficient of friction are controlled. As a result of this construction, the aesthetic design of the tread unit and of the passenger conveyor system can be improved. In addition, the reduced weight of the tread unit contributes to labor-saving at the time of mounting, and a passenger conveyor system using these tread units can be reduced in size and weight as a whole.

Abstract: The invention relates to a temperature-measuring-resistor which comprises vanadium oxide as a matrix material. The matrix material further contains at least one member selected from a metal, a metal oxide and a metal nitride, and the member has an electric conductivity higher than that of the vanadium oxide. The temperature-measuring-resistor has a low room temperature resistivity, and a volume resisivity that varies greatly with temperature.

Abstract: Embodiments of the present invention provide a small and well-characterized bulk acoustic wave device by fabricating a filter having a wide band width or a resonator having a wide oscillation frequency range together with a semiconductor circuit. In embodiments of the present invention, a bulk acoustic wave device comprises a semiconductor substrate having a dielectric substance layer thereon, the dielectric substance layer has a ground conductor layer thereon, the ground conductor layer has a piezoelectric ceramic thin film thereon and the piezoelectric ceramic thin film has a conductive electrode pattern thereon. The thickness of the piezoelectric ceramic thin film is more than ten times the thickness of the ground conductor layer, and the wave number of acoustic waves that propagate in a direction parallel to a surface of the piezoelectric ceramic thin film multiplied by the thickness of the piezoelectric ceramic thin film is less than 2.

Abstract: In a process for manufacturing an oxide-system dielectric thin film using a raw material compound in which a metal atom is coupled with an organic group through oxygen atoms by the CVD method. A vapor of organic solvent having a boiling point less than 100.degree. C. contacts to the raw material compound at least in one of processes for vaporizing or transporting said raw material compound. The raw material compound of oxide-system dielectric thin film can be vaporized stably and transported to the reactor at a low temperature than before. Therefore, a composition can be controlled homogeneously and an oxide-system dielectric thin film having a good performance can be manufactured.

Abstract: The improved dielectric porcelain for use at high frequencies is represented by the general formula:xSrO.multidot.yCaO.multidot.z[(1-m)TiO.sub.2 .multidot.m/2{TaO.sub.5/2 .multidot.(1-n)GaO.sub.3/2 .multidot.nGdO.sub.3/2 .music-sharp.][where 0.42.ltoreq.x.ltoreq.0.54 (or 0.06.ltoreq.x.ltoreq.0.18);0.06.ltoreq.y.ltoreq.0.18 (or 0.42.ltoreq.y.ltoreq.0.54);z=0.40;0.05.ltoreq.m.ltoreq.0.70;0.00.ltoreq.n.ltoreq.1.00;x+y=0.6]with Mn.sub.2 O.sub.3 being contained in an amount of up to 3 wt% of the total amount. The porcelain can be formulated from essentially similar basic compositions and yet it exhibits specific dielectric constants over a broad range on the order of 20-60 in the microwave frequency region and, at the same time, it has commerically acceptable high values of Q factor as well as stable and small temperature coefficients of dielectric constant.

Abstract: The present invention provides microwave ceramic dielectric materials having large relative dielectric constant, very large Q, and stable and small temperature coefficient.The ceramic dielectric materials of the present invention are expressed by the general formula:[{BaO}.sub.x {TiO.sub.2 }.sub.y {(Sm.sub.2 O.sub.3).sub.1-m-n (SrO.cndot.CeO.sub.2).sub.m (CaO.cndot.CeO.sub.2).sub.n }.sub.z ].sub.1-A [SrTiO.sub.3 ].sub.Awherein, 0.1.ltoreq.x.ltoreq.0.25, 0.6.ltoreq.y.ltoreq.0.85, 0.05.ltoreq.z.ltoreq.0.3, 0.ltoreq.m.ltoreq.0.80, 0.ltoreq.n<0.8, x+y+z=1, m+n.ltoreq.0.8, x+y+z=1, 0<A.ltoreq.0.40; x,y,z are expressed by mol fraction.

Abstract: A dielectric ceramics for high frequencies having a structure being represented by the following general formula:Sr.sub.3(1-x) Ca.sub.3x Ti.sub.2 O.sub.7 (where: 0.66<x.ltoreq.0.84).The dielectric ceramics is produced by blending and sintering strontium carbonate, calcium carbonate and titanium oxide.