Abstract: A ground electrode and a terminal electrode are formed on a first main surface of dielectric substrate forming a circuit board. Wiring electrodes are formed on a second main surface of the dielectric substrate. A semiconductor device and a filter are mounted on the wiring electrodes. A strip line electrode of the filter is connected to the ground electrode of the circuit board for conducting direct current, via a through-hole provided in the filter, a ground electrode of the filter, the wiring electrode, and a through-hole provided in the circuit board. With this arrangement, the terminal electrode is connected to a high-frequency signal terminal of the semiconductor device via the filter.

Abstract: To provide a mounting structure for a gas adsorption filter and a housing equipped with the gas adsorption filter that make it possible to overcome the contradiction between achieving a further reduction in the size of airtight containers such as casings for magnetic storage disk devices, and ensuring improved control over moisture, noxious gases, and other types of contaminants in the airtight containers.

Abstract: A band-pass filter includes electrodes formed on both upper and lower surfaces of a dielectric plate, and a plurality of non-electrode portions on the upper and lower surfaces of the dielectric plate so that the non-electrode portions face each other across the dielectric plate to form resonators in regions confined by the non-electrode portions on the dielectric plate. The resonators other than at least input- and output-stage resonators are n&lgr;2 resonators, where &lgr; denotes one wavelength and n is an integer more than one. The first- and second-stage resonators, and the third- and fourth-stage resonators are magnetically (inductively) coupled, and the second- and third-stage resonators are capacitively or inductively coupled. The band-pass filter therefore provides satisfactory attenuation characteristic from the pass band to the stop band, and can also be compact and lightweight.

Abstract: In a snowmobile, a four-cycle engine is mounted in such a manner that its crankshaft is arranged along the body width direction and the central axis of a cylinder(s) is tilted rearward by angle &agr; with respect to the vertical direction of the body, forming a rear tilted engine. At least part of the engine intake system including an air cleaner box and throttle body, connected to the intake port(s) of the engine is accommodated in the space inside the topmost projected portion of the engine hood. Exhaust is led out to the muffler located in front of the cylinder(s) by the exhaust system connected to the exhaust port(s) at the front of the cylinder head. Further, the intake passage is arranged between the engine body and the steering post.

Abstract: In a snowmobile, a four-cycle engine is mounted in such a manner that its crankshaft is arranged along the body width direction and the central axis of a cylinder(s) is tilted rearward by angle &agr; with respect to the vertical direction of the body, forming a rear tilted engine. At least part of the engine intake system including an air cleaner box and throttle body, connected to the intake port(s) of the engine is accommodated in the space inside the topmost projected portion of the engine hood. Exhaust is led out to the muffler located in front of the cylinder(s) by the exhaust system connected to the exhaust port(s) at the front of the cylinder head. Further, the intake passage is arranged between the engine body and the steering post.

Abstract: A process for producing a molybdenum-bismuth-iron-containing metal oxide fluidized bed catalyst which has a controlled particle diameter and has satisfactory activity and physical properties. In a process for producing a fluidized bed catalyst containing molybdenum-bismuth-iron and silica as a carrier component, dried products formed in a spray drying step and having a particle diameter outside a desired range are pulverized, then the pulverized one is mixed into a slurry before spray drying, the resulting mixture is spray-dried, and the spray-dried particles are subjected to a classification operation to obtain particles having a diameter within the desired range, which are then calcined. The catalyst produced according to the present invention is suitable for producing acrylonitrile by ammoxidation of propylene.

Abstract: For the production of acrylonitrile by ammoxidation of propylene, there is provided a catalyst capable of giving a high yield for a long period of time. In producing acrylonitrile by ammoxidation of propylene, there is used a metal oxide as a catalyst, which metal oxide contains iron, antimony, molybdenum, bismuth, potassium, an F element, a G element, an H element and silica as essential components in a specific composition ratio, and in which metal oxide iron antimonate exists as a crystal phase, provided that the F element is at least one element selected from the group consisting of magnesium, calcium, strontium, barium, manganese, cobalt, nickel, copper, silver, zinc and cadmium, the G element is at least one element selected from the group consisting of chromium, aluminum, gallium and indium, and the H element is at least one element selected from the group consisting of yttrium, lanthanum, cerium, praseodymium, neodymium and samarium.

Abstract: Grating built-in type optical fiber couplers and optical amplifiers form a multiplexer for efficiently effecting multiplex separation of a specific wavelength without using an optical circulator. A function to add a signal of specific wavelength efficiently can be realized. Additionally, the device is inexpensive.

Abstract: The invention provides a high frequency filter which can facilitate filter-characteristic adjustments and miniaturization and can obtain an excellent broadband characteristic. In addition, the invention provides a filter device using the high frequency filter, and an electronic apparatus incorporating the same. In this filter, a ground electrode is arranged on one of the main surfaces of a dielectric substrate. On the other main surface thereof there are arranged two or more microstrip lines, and one end of each microstrip line is grounded via a through-hole to form a high frequency filter. The microstrip lines and the shared through-hole constitute microstrip line resonators, which are coupled via the inductance of the through-hole. With this arrangement, there is no need for an additional coupling element. Thus, the size of the high frequency filter can be reduced. Furthermore, since a large coupling coefficient can be obtained, the high frequency filter can have a broadband characteristic.

Abstract: A gas adsorption filter located over a breathing hole within a semi airtight container, wherein the gas adsorption filter has an opening that is connected with and open to the breather hole and, comprises a base material for attaching the filter to the inner wall of the container and a gas adsorption body that is laminated and fixed to the gas flow path surface of the base material, and on the gas contact surface on the side where the gas adsorption body is in contact with the gas flow path surface of the base material, there is at least one gas inflow orifice that is connected to the opening of the base material, and at least one gas discharge orifice that is connected to the outside of the gas adsorption body, and a groove section is formed that is connected to the gas inflow orifice and the gas discharge orifice.

Abstract: A moisture-absorbent unit capable of sufficiently restricting condensation inside a semi-sealed container that can be miniaturized and whose interior is at a comparatively high humidity, when this semi-sealed container undergoes a sharp temperature drop from being placed in a low-temperature environment, and to provide a semi-sealed container having the moisture-absorbent unit. A moisture-absorbent unit used inside a semi-sealed container, this moisture-absorbent unit characterized in having a porous moisture-absorbent material for which the difference in moisture absorption, obtained by subtracting the moisture absorption at a relative humidity of 85% from the moisture absorption at a relative humidity of 95%, is 15% by mass or more of the moisture-absorbent material before absorption.

Abstract: For the production of acrylonitrile by ammoxidation of propylene, there is provided a process capable of giving a high yield and maintaining such an effect for a long period of time. In producing acrylonitrile by ammoxidation of propylene, a fluidized bed catalyst is used and the reaction is carried out while appropriately adding a molybdenum-containing material, wherein the fluidized bed catalyst, in which iron antimonate exists as a crystal phase, contains molybdenum, bismuth, iron, potassium, an M component, an N component and silica as essential components, and has a number of Mo/Me of from 0.

Abstract: In a cooling arrangement for a water-cooled snowmobile engine, a water pump is disposed on the front side of the cylinder head, under the exhaust manifold and is coupled to a crankshaft so that it is driven by the rotational force which is transmitted through a drive belt from a drive pulley fitted on the crankshaft end. A cooling water inlet port for leading cooling water into the interior of the engine is provided on the front side of the cylinder block and under the exhaust manifold while a cooling water outlet port through which cooling water is taken out from the interior of the engine is arranged on the cylinder head's side face at a position over and opposite to the drive belt and a thermostat is arranged at the cooling water outlet port.

Abstract: For the production of acrylonitrile by ammoxidation of propylene, there is provided a process capable of giving a high yield and maintaining such an effect for a long period of time. In producing acrylonitrile by ammoxidation of propylene, a fluidized bed catalyst is used and the reaction is carried out while appropriately adding a molybdenum-containing material, wherein the fluidized bed catalyst contains molybdenum, bismuth, iron, nickel, chromium, potassium, an F component and silica as essential components, and has a number of Mo/Me of from 0.8 to 1, wherein the Mo/Me is a number obtained by dividing the product 20 of a valence number of molybdenum as molybdic acid and an atomic ratio of molybdenum by the sum of respective products of respective valence numbers and atomic ratios of bismuth, iron, nickel, chromium, potassium, the F component element, a G component element and a Y component element.

Abstract: Electrodes are formed on both surfaces of a dielectric plate. Openings are formed in the electrodes such that pairs of openings face each other through the dielectric plate. Each pair of electrode openings defines a resonator. The resonators positioned at the ends of the dielectric plate are directly coupled to a waveguide formed by a package base and a package cover.

Abstract: A method for regeneration of a molybdenum-containing oxide fluidized bed catalyst which comprises impregnating a fluidized catalyst of a metal oxide containing molybdenum, bismuth and iron which has been deteriorated by being used for a reaction in production of acrylonitrile by ammoxidation of propylene, with a solution of a molybdenum compound and a solution of at least one compound containing at least one element selected from the group consisting of iron, chromium, lanthanum and cerium which are prepared separately or with a previously prepared mixed solution of the above compounds, drying the resulting catalyst and, then, firing the catalyst at a temperature of 500-700° C.

Abstract: To provide a mounting structure for a gas adsorption filter and a housing equipped with the gas adsorption filter that make it possible to overcome the contradiction between achieving a further reduction in the size of airtight containers such as casings for magnetic storage disk devices, and ensuring improved control over moisture, noxious gases, and other types of contaminants in the airtight containers.

Abstract: A gas adsorption filter located over a breathing hole within a semi airtight container for regulating the pressure of said container and capturing harmful gases that flow into said container through said breather hole, wherein the gas adsorption filter has an opening that is connected with and open to said breather hole and, comprises a base material having and attachment surface for attaching the filter to the inner wall of said container and a gas adsorption body that is laminated and fixed to the gas flow path surface on the side opposite to that of said attachment surface of said base material, and on the gas contact surface on the side where said gas adsorption body is in contact with the gas flow path surface of said base material, there is at least one gas inflow orifice that is connected with and open to the opening of said base material, and at least one gas discharge orifice that is connected with and open to the outside of said gas adsorption body, and a groove section is formed that is connected w

Abstract: Using grating built-in type optical fiber coupler and an optical amplifier, multiplex separation of the specific wavelength efficient is done without using an optical circulator etc., and the function to add the signal of specific wavelength efficiently can be realized. In addition, it is in offering the wavelength multiplex transmission system that obtains a device cheaply.

Abstract: In a snowmobile, a four-cycle engine has an alternator as a generator while the snowmobile body has heat exchangers through which the cooling water of the engine is cooled by heat exchange with external air and snow, in a front part and at the ceiling of a crawler house. The alternator is positioned between the four-cycle engine and the front heat exchanger. Further, an exhaust manifold is arranged at an upper position in front of the engine body while an approximately cylindrical oil filter is provided under the exhaust manifold and inclined forwards in the vehicle's direction of travel.