Abstract: A blower includes: an impeller on which there are arranged axial flow blades 40 mounted at circumferential intervals to an outer peripheral surface of a boss; a case surrounding the impeller; and a bell mouth cylindrically constricted to guide gas into the case, wherein an inner diameter of the bell mouth is smaller than an outer diameter of the impeller. Further, each blade has, in the radial direction, a sweepforward wing portion situated on the boss side and exhibiting a positive advance ratio value, and a sweepback wing potion situated on the outer peripheral side of the blade and exhibiting a negative advance ratio value, with the arc length of each blade increasing from the boss side toward the outer peripheral side. Therefore, it is possible to achieve an improvement in ventilation efficiently, through an increase in static pressure and to achieve a reduction in noise.

Abstract: An electrical connector adapted to be mounted onto a panel of an electronic appliance includes a housing and a predetermined number of contacts held and fixed in the housing. The housing includes one or more projections formed on each of an upper surface and a lower surface of the housing, and the projections are adapted to be positioned on a first side of the panel. The electrical connector also includes a block which engages the housing, and the block is adapted to be positioned on a second side of the panel which is opposite the first side of the panel. Moreover, the block includes a through-hole formed therethrough. The electrical connector also includes a fixing pin, and a portion of the fixing pin is positioned within the through-hole.

Abstract: An optical ring system having: a wavelength demultiplexer to which wavelength-multiplexed optical signal to be sent through an optical fiber from a previous node of multiple nodes is input and in which optical signal with each wavelength assigned to itself is demultiplexed; an optical ring device which is disposed in a predetermined node of the multiple nodes to the each wavelength assigned and which is composed of a failure existence judging part which terminates an overhead of each optical signal with a wavelength demultiplexed by the wavelength demultiplexer and judges whether a failure occurs in regard to a wavelength in a previous section through which optical signal with the assigned wavelength is sent, and a switching part which, when the failure existence judging means determines the occurrence of failure, selects a path that allows optical signal with the wavelength to be transmitted to the previous node while avoiding the previous section incurring the failure; and a wavelength multiplexer which mul

Abstract: According to a burner of the present invention, a stable combustion is obtained in a wide range from a high-load operation condition to a low-load operation condition even in the case of low quality solid fuel such as brown coal. The amount of air supplied from additional air holes or additional air nozzles 12 can be adjusted depending on the combustion load of furnace 41. At a low load, the amount of air supplied from additional air holes or additional air nozzles 12 is increased, whereby the oxygen concentration in a recirculation zones 19 formed downstream of the outside of a fuel nozzle 11 exit, permits a stable combustion. At a high load, the amount of air supplied from additional air holes or additional air nozzles 12 is reduced, whereby a flame is formed in a position far from the fuel nozzle 11. This suppresses thermal radiation onto a solid fuel burner 42 structure and a furnace 41 wall.

Abstract: An electrical connector includes a housing and a required number of contacts held and fixed in the housing. The housing is provided with at least one projection on each of surfaces defining its thickness and is provided with a block formed integrally with or separately from the housing. The block is formed with a through-hole in its one flange portion, into which a fixing pin can be inserted, whereby the electrical connector is mounted on a panel in a floating manner. With this arrangement, the electrical connector can be simply and easily mounted on the panel without increasing manufacturing cost.

Abstract: A fan according to the present invention can be monolithically molded out of a metal with a low energy in combination with a structure of a metal mold, in which gate arrangement and/or distribution of dimensions of vanes is devised in injecting a low melting-point metal such as magnesium, wherein not only production but also reproducing such as recycling are facilitated, and also a metalwave of the fan can be produced in consideration of the global atmosphere preservation.

Abstract: Recycled ceramic slurry is produced by a method including the steps: dissolving the waste material of unfired ceramic in a solvent to form a waste solution; and adjusting a composition of the waste solution to thereby produce the recycled ceramic slurry. If the waste material of unfired ceramic includes a metal component, the metal component may be removed therefrom before the step of adjusting the composition of the waste solution.

Abstract: A fan according to the present invention can be monolithically molded out of a metal with a low energy in combination with a structure of a metal mold, in which gate arrangement and/or distribution of dimensions of vanes is devised in injecting a low melting-point metal such as magnesium, wherein not only production but also reproducing such as recycling are facilitated, and also a metalwave of the fan can be produced in consideration of the global atmosphere preservation.

Abstract: According to a burner of the present invention, a stable combustion is obtained in a wide range from a high-load operation condition to a low-load operation condition even in the case of low quality solid fuel such as brown coal.

Abstract: A connector for memory cards includes a connector body having side walls on both sides and a rear wall. The side walls are formed over their length with card receiving portions to meet shapes of side edges and the number of the memory cards to be used. The connector further includes card identification terminals made of a springy metal strip arranged in a plurality of steps in inner surface of one of the side walls, identification tabs arranged spaced from the card identification terminal prior to insertion of a card, for identifying an existence of an inserted card with the aid of the contact between the inserted card and the card identification terminal, and terminals suitably arranged on the rear wall for writing electronic information into cards and reading stored information from cards.

Abstract: A fan according to the present invention can be monolithically molded out of a metal with a low energy in combination with a structure of a metal mold, in which gate arrangement and/or distribution of dimensions of vanes is devised in injecting a low melting-point metal such as magnesium, wherein not only production but also reproducing such as recycling are facilitated, and also a metalwave of the fan can be produced in consideration of the global atmosphere preservation.

Abstract: A connector for memory cards includes a connector body having side walls on both sides and a rear wall. The side walls are formed over their length with card receiving portions to meet shapes of side edges and the number of the memory cards to be used. The connector further includes card identification terminals made of a springy metal strip arranged in a plurality of steps in inner surface of one of the side walls, identification tabs arranged spaced from the card identification terminal prior to insertion of a card, for identifying an existence of an inserted card with the aid of the contact between the inserted card and the card identification terminal, and terminals suitably arranged on the rear wall for writing electronic information into cards and reading stored information from cards.

Abstract: The present invention relates to a method of detecting harmful components selected from the group consisting of volatile inorganic hydrides, volatile inorganic halides and organometallic compounds. The harmful components can be detecting by bringing it into contact with a crystalline cupric hydroxide. The harmful components can be detected based on the color change of the copper hydroxide.

Abstract: The present invention relates to a method of removing harmful components selected from the group consisting of volatile inorganic hydrides, volatile inorganic halides and organometallic compounds and a method of detecting the same, apparatus employed according to these methods. The harmful components can be removed by bringing it into contact with a crystalline cupric hydroxide. The harmful components can be detected based on the color change of the copper hydroxide.

Abstract: The present invention relates to a process for the production of a glass from silica as a raw material by a vacuum melting method, in which a high quality glass is produced efficiently by compounding a silica powder containing an excess amount of the accelerator for phase conversion and silica powders containing substantially no such accelerator or by introducing silica powders in a solution containing an accelerator for phase conversion, adding an acid or basic component to the mixture to adjust the pH thereof, stirring the mixture for mixing, and subjecting the mixture to dehydration and drying to obtain silica powders containing the accelerator for phase conversion in proper quantities, filling the resultant silica powders in a vessel and heating the powder to form a sintered molded body having cristobalite phase having a self-supporting property and also having a proper matrix strength and a high porosity, and then heating the sintered body under vacuum.

Abstract: The present invention relates to a process for production of a glass by the vacuum melting method using silica as raw material and comprises uniformly preheating a silica powder containing an accelerator for phase conversion to about 800.degree. C.; filling the preheated silica powder in a container while substantially maintaining the temperature; further heating the silica powder to convert it into a sintered body having a cristobalite phase; and then heating and melting the sintered body in vacuum for glass formation, whereby not only are improvments in raw material efficiency and productivity by shortening of the heating time achieved, but also the formation of cracks on the surface of the resulted sintered body which has been one of the important reasons for resulting in products of sub-standard can be substantially completely avoided.

Abstract: A process for production of a glass by a vacuum melting method using silica as raw materials comprising heating silica powders in the presence of an accelerator for phase conversion to convert them into a sintered body having cristobalite phase; molding or repowdering the sintered body; containing or filling the resulted sintered body in a container having a desired shape; and then heating and melting it in vacuo for glass formation, or accumulating a plurality of the sintered bodies into a desired shape; and then heating and melting it for glass formation, whereby a high-quality glass ingot having a desired shape or a larger glass ingot can be readily obtained without reduction in productivity.