Abstract: In a dielectric filter according to the present invention, a depressed part is formed by removing a portion of an outer peripheral conductor on the open face side of each of a plurality of one-end face short-circuited type coaxial resonators or a portion of the outer peripheral conductor including a dielectric member. A dielectric substrate having a plurality of capacitance forming electrodes for forming antiresonance capacitances between the electrodes and inner peripheral conductors of the coaxial resonators formed thereon is mounted on the depressed part, and a reactance element for coupling the capacitance forming electrodes is provided on the dielectric substrate.

Abstract: In order to obtain a microwave dielectric ceramic composition having a high dielectric constant (.epsilon.r) and a large Q value and having a temperature coefficient of resonance frequency (.tau.f) which is close to zero, the present invention is directed to a microwave dielectric ceramic composition expressed by a composition formula of w.Li.sub.2 O-x.CaO-y.Sm.sub.2 O.sub.3 -z.TiO.sub.2, wherein w, x, y and z are respectively in the ranges of 0.0 mole % <w.ltoreq.25.0 mole %, 0.0 mole % .ltoreq.x.ltoreq.50.0 mole %, 0.0 mole % <y.ltoreq.30.0 mole %, 0.0 mole % <z.ltoreq.80.0 mole %, where w+x+y+z=100 mole %, and not more than 10 parts by weight of any one of MnO.sub.2, Bi.sub.2 0.sub.3, Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5 and SnO.sub.2 is contained therein.

Abstract: This invention relates to a shaped fibrous material for use in the manufacture of fiber-reinforced metals comprising a uniform mixture of ceramic fibers and aluminum borate whiskers. The invention also relates to a method for producing the shaped fibrous material comprising the steps of dispersing ceramic fibers and aluminum borate whiskers in a suitable solvent containing a binder to form a slurry, transferring the slurry into a suction molding, aspirating and dehydrating the slurry to form a shaped dehydrated fibrous material, and drying and firing the shaped dehydrated fibrous material to obtain the shaped fibrous material. The shaped fibrous material can be cast efficiently into a fiber-reinforced metal with a high yield. The thus produced fiber-reinforced metal has a high wear resistance combined with a very mild nature of attacking the mating member.

Abstract: In a dielectric filter according to the present invention, a depressed part is formed by removing a portion of an outer peripheral conductor on the open face side of each of a plurality of one-end face short-circuited type coaxial resonators or a portion of the outer peripheral conductor including a dielectric member. A dielectric substrate having a plurality of capacitance forming electrodes for forming antiresonance capacitances between the electrodes and inner peripheral conductors of the coaxial resonators formed thereon is mounted on the depressed part, and a reactance element for coupling the capacitance forming electrodes is provided on the dielectric substrate.

Abstract: The present invention is characterized in that in order to obtain a microwave dielectric ceramic composition having a high dielectric constant (.epsilon.) and a large Q value and having a temperature coefficient (.tau.f) which is close to zero, calcium oxide and strontium oxide, sodium oxide or lead oxide which are mixed with each other in an adjusted ratio are added to lithium oxide, samarium oxide and titanium oxide.

Abstract: In a dielectric filter according to the present invention, a depressed part is formed by removing a portion of an outer peripheral conductor on the open face side of each of a plurality of one-end face short-circuited type coaxial resonators or a portion of the outer peripheral conductor including a dielectric member. A dielectric substrate having a plurality of capacitance forming electrodes for forming antiresonance capacitances between the electrodes and inner peripheral conductors of the coaxial resonators formed thereon is mounted on the depressed part, and a reactance element for coupling the capacitance forming electrodes is provided on the dielectric substrate.

Abstract: Herein disclosed is a radar system having a function for setting a watch alarm region, which function has been improved in operability. A region displayed in a display part surrounding the radar system is divided by two border lines. One region, for example, a region having a smaller angle contained by the two border lines, is controlled to be set as the watch alarm region in accordance with the first setting instruction from a user, the other region is next controlled to be reset as the watch alarm region when receiving the second instruction from the user within a predetermined time period. Thus, the user may select one between the divided regions as desired, through easy operations. If a wrong region has been selected as the watch alarm region, differently from the user's will, the mistake may be readily corrected.

Abstract: A microwave ceramic composition containing as main components substances expressed by a composition formula of x.BaO - y TiO.sub.2 - z.Nd.sub.2 O.sub.3 (where 0.05<=x<=0.25, 0.60<=y<=0.85, and 0.05<=z<=0.225) when their molar fractions are taken as x, y and z (x+y+z=1) and containing as a subcomponent one type selected from the group consisting of In.sub.2 O.sub.3, Bi.sub.2 O.sub.5, GeO.sub.2 and V.sub.2 O.sub.5.

Abstract: A refractory for use in firing ceramics has a ceramic coating applied by plasma spraying onto the surface of a heat-resistant lightweight shaped article containing heat-resistant lightweight shaped article containing heat-resistant inorganic fibers. The shaped article is composed of highly aluminous short fibers not longer than 2,000 .mu.m or a mixture thereof with an aluminous refractory powder as bound to each other by means of aluminous binder, the shaped article not containing free silica.

Abstract: A microwave dielectric ceramic composition which is obtained by selecting, in a composition formula of (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2) TiO.sub.3, Li.sup.1+ and Nd.sup.3+, Co.sup.3+ or Pr.sup.3+ as A.sup.1+ and B.sup.3+, respectively. The dielectric ceramic composition expressed by (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2) TiO.sub.3 has a high dielectric constant and has a temperature coefficient of resonance frequency .tau.f which is large on the minus side. MgO, CoO, ZnO, CaCO.sub.3 or SrCO.sub.3 is added to such a dielectric ceramic composition expressed by (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2 /TiO.sub.3, to improve the Q value of the dielectric ceramic composition.

Abstract: A process of production of alumina short fiber reinforced magnesium or magnesium alloy product features formation of alumina short fiber pre-form utilizing a inorganic binder which is composed of one or more oxides having thermodynamically stability equivalent to or higher than MgO. In the alternative, the composite almina fiber and binder surfaces of the alumina short fiber pre-form can be coated by a baked coating layer. Pressure casting of molten magnesium or magnesium alloy is then performed for forming the final products.

Abstract: A microwave dielectric ceramic composition containing as main components substances expressed by a composition formula of x.multidot.TiO.sub.2 -y.multidot.ZrO.sub.2 -z.multidot.SnO.sub.2 (where 0.30.ltoreq.x.ltoreq.0.60, 0.25.ltoreq.y.ltoreq.0.60, and 0.025.ltoreq.z.ltoreq.0.20) when their molar fractions are taken as x, y and z (x+y+z=1), and containing as additives predetermined amounts of one type selected from the group consisting of MnO, Al.sub.2 O.sub.3, CuO, Li.sub.2 O and Ga.sub.2 O.sub.3 and predetermined amounts of one type selected from the group consisting of Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5.

Abstract: A heat-resistant and inorganic shaped article comprising a homogeneous mixture of an alumina powder having an average particle size of 10-50 .mu.m and polycrystalline alumina fibers that are bound together with amorphous silica or alumina. The article has a bulk density of 0.4-1.5 g/cm.sup.3 and a total Al.sub.2 O.sub.3 content of at least 75 wt %.

Abstract: A surface acoustic wave device comprising a single crystal silicon substrate and a piezoelectric thin film of single crystal or C-axis-oriented polycrystalline aluminum nitride formed on the surface of the substrate. The C-axis of the piezoelectric thin film is set in a direction in which the projection vector of the C-axis on a plane containing the axis of propagation direction of a surface acoustic wave and a normal axis of the substrate makes an inclination angle .theta. of up to 60 degrees with the axis of propagation direction, whereby the device is given a coupling coefficient of at least 2% is given as maximum coupling coefficient of the device.

Abstract: A liquid crystal chopper comprising a pair of electrically conductive substrates, a spacer keeping the substrates so as to define a space between the substrates, and a liquid crystal of DSM type which is enclosed in the space, with a dielectric anisotropy of -0.5 or more and not exceeding 0. An infrared sensor using the liquid crystal chopper in the above construction as a chopper mechanism to intermittently interrupt infrared rays incident upon the pyroelectric element. The infrared sensor has a short response time at the liquid crystal chopper and consumes less power.

Abstract: An infrared gas analyzer using a pyroelectric infrared sensor, which includes a heating unit for heating the infrared sensor, a heating sensor for detecting its heating temperature and a temperature sensor for detecting the ambient temperature of the infrared sensor, and controls the heating unit so as to retain the ambient temperature of the infrared sensor at a constant so that the output error is small irrespective of the change in ambient temperature.

Abstract: A surface acoustic wave device having a single crystal aluminum nitride film wherein when the direction of propagation of the surface acoustic wave is expressed by (.lambda.,.mu.,.theta.) according to the Euler angle notation, .theta. is set to 90 degrees, .lambda. to a desired angle, and .theta. to an angle in the range of 30 to 150 degrees. In a surface acoustic wave device having a c-axis-oriented aluminum nitride film, the direction of c-axis orientation of the piezoelectric film is inclined within a plane containing the direction of propagation of the surface acoustic wave and perpendicular to the surface of the piezoelectric film at an angle in the range of about .+-.30 degrees to about .+-.150 degrees with respect to a normal to the piezoelectric film. The devices are 1.122% in maximum coupling coefficient.

Abstract: A lightweight refractory is disclosed which is a shaped porous body having refractory particles and aluminous short fibers bound to each other with mullite. The crtystalline structure of the refractory is chiefly composed of mullite and corundum. The mullite content is at least 12 mol % of the sum of mullite and corundum. The refractory is substantially free of free silica.

Abstract: In an apparatus wherein an infrared sensor is incorporated opposite to an opening formed at a predetermined position of a housing, a distance keeping member for keeping a constant distance from a temperature measuring portion is further mounted on another predetermined position of the housing, and an output signal from the infrared sensor responding to the infrared rays from the temperature measuring portion is supplied to a temperature measuring circuit whose operational state is selected by a temperature measurement control switch, and the temperature of the temperature measuring portion is displayed on a display unit which is driven by the output signal from the temperature measuring circuit.

Abstract: A method for the insulation of a hot metallic material which is heated for hot working is described, which comprises applying a mixture of acidic aluminum phosphate, e.g., aluminum hydrogenorthophosphate, a multivalent metal oxide, hydroxide, silicate or carbonate powder, and water onto the surface of the hot metallic material and allowing the mixture to be heated by the heat of the hot metallic material to convert it to a porous hardened material. The porous hardened material acts as an insulating coating layer for the hot metallic material, permitting hot working in an insulated state for a long period of time.