Abstract: The invention concerns a method for casting a part made of metal alloy such as an aluminium alloy comprising the following steps: forming a core (N, PNC) having at least one shaft (PC) designed to form in the part a cylinder and at least one cavity (P) designed to form in the part a support and/or retaining zone for a working member, and at least a cooling unit (RE) proximate to the cavity; positioning the core in a metal mould cavity, and feeding the mould lined with its liquid alloy core by gravity. The invention is particularly useful for casting internal engine cylinder blocks with aluminium cylinders with improved geometrical and mechanical properties of the crankshaft bearing zones.

Abstract: A process of fabricating a light alloy casting, such as an aluminum alloy casting, including at least one metal insert includes applying a coating of lampblack to a face of the insert intended to be in contact with the alloy of the component and casting the component with the molten alloy in a mold cavity in which the insert is positioned. Applications include fabricating engine blocks with integrally cast liners made of cast iron.

Abstract: A test stand for cylinder head components of an internal combustion engine includes at least one combustion or pressure chamber. The test stand supplies a hydraulic fluid to the chamber, and controls the pressure of the hydraulic fluid to simulate pressure cycles in the chamber. The test stand controls the pressure with at least one source of high-pressure hydraulic fluid, the high-pressure being at an adjustable and constant level, at least one solenoid valve per chamber, receiving hydraulic fluid from the high-pressure source, and automatically drives each solenoid valve as a function of the pressure in the chamber and a set-point pressure, so that each solenoid valve feeds this chamber with hydraulic fluid the pressure of which is controlled at any time by the solenoid valve and simulates predetermined pressure cycles as a function of time.

Abstract: A method of heat-treating a casting made of an aluminum-based alloy including an alloy of aluminum, silicon, and magnesium comprising heat treating the casting at a first temperature range for a first duration; gradually cooling the casting to a second temperature having a second temperature range; maintaining the casting at the second temperature range for a second duration; quenching the casting; and age hardening the casting.

Abstract: The invention provides equipment for molding castings in a mold having at least one sand core (Na1), in which the positioning of the or each core is obtained by the core co-operating with an element (S) of the mold, in particular a metal mold element. This equipment is remarkable in that the or each core possesses an insert (I) secured to the core while making said core and via which said core is suitable for co-operating with the mold element in question. The invention also provides an associated method of positioning cores. The invention is particularly applicable to improving the positioning of admission pipes in light alloy cylinder heads for engines.

Abstract: A write clock generation circuit is provided that can detect wobble signal in high accuracy and can appropriately generate write clock with only small jitter even when the operation is switched from reproduction to recording. The wobble signal is obtained by changing stepwise the gain of a variable gain amp in the rear stage of a divided photo detector using a gain control circuit in a predetermined time period just after the beginning of recording. The write clock signal is generated using the above wobble signal. According to this arrangements, the change in wobble signal just before and after the beginning of recording can be reduced, and the gain change of a wobble signal amplitude regulation AGC is made slow. As a result, high frequency deviation of the wobble signal can be reduced even when the operation is switched from reproduction to recording, and the write clock with only small jitter can be generated.

Abstract: The invention relates to a wheel rim made from a light alloy, such as an aluminium-based alloy, comprising a front face (10) and a tyre tread (20) which are welded together. The inventive method of producing the wheel rim (J) comprises the following steps: moulding of the front face (10) with a light alloy; provision of a weldable alloy strip with structural hardening; curving of said strip to produce a generally cylindrical shape; welding of the ends in relation to the curved strip with fusion of the strip material; forming of the strip by necking and/or spinning in order to form the tyre tread (20); and welding of the front face and the tyre tread to one another.

Abstract: The invention provides equipment for molding castings in a mold having at least one sand core (Na1), in which the positioning of the or each core is obtained by the core co-operating with an element (S) of the mold, in particular a metal mold element. This equipment is remarkable in that the or each core possesses an insert (I) secured to the core while making said core and via which said core is suitable for co-operating with the mold element in question. The invention also provides an associated method of positioning cores. The invention is particularly applicable to improving the positioning of admission pipes in light alloy cylinder heads for engines.

Abstract: The invention concerns a test stand for elements of an internal combustion engine cylinder head comprising at least a combustion or pressure chamber (29), means supplying (10) a hydraulic fluid into the combustion or pressure chamber, and means controlling said fluid pressure so as to simulate pressure cycles in the combustion or pressure chamber. The control means comprise at least a high pressure source (6) of hydraulic fluid, at least one solenoid valve (7) per combustion or pressure chamber to supply said combustion or pressure chamber with hydraulic fluid from the high pressure source, at least a pressure sensor (8) for measuring the pressure in each combustion or pressure chamber, and control means (9) for controlling each solenoid valve on the basis of the pressure measured in said combustion or pressure chamber and a setpoint pressure.

Abstract: A thermal fatigue test stand for combustion engine cylinder heads. A cylinder head support having at least a cylinder head zone capable of being exposed to the engine combustion. At least one burner for directing a flame on the entire head zone. At least one heat flux sensor located in the cylinder head thickness at the zone to verify whether the heat flux produced by the flame is at least approximately in conformity with a predetermined value. The invention also concerns a method for calibrating such a test stand, and a method for testing cylinder heads. The invention is particularly useful for developing, both from a metallurgical and geometrical viewpoints, aluminum alloy cylinder heads.

Abstract: A process for molding a casting made of light alloy comprises the steps consisting in: preparing a mold with a print made of physically setting sand, incorporating a movable closure means in the mold near a feed runner of the mold, placing the mold in such a way that its feed runner is in the lower part, connecting the feed runner of the mold to a tube for feeding with a pressurized molten alloy, filling the mold with said alloy, before any substantial solidification of the casting, moving the closure means in order to close off the feed runner, then rotating the mold through approximately 180° in order to ensure solidification in gravity mode. Application especially to the manufacture of engine blocks for motor vehicles.

Abstract: Disclosed is a method of retrieving information content in a computer network. The method comprises the steps of specifying a search criterion on a user computer (101) of the computer network; transmitting a first mobile agent (111a) including computer-executable program code means and the search criterion to at least a first host computer (102, 103, 104, 105, 106) of the computer network; generating a search result by means of the received first mobile agent indicative of whether the information content corresponding to the specified search criterion is available on the first host computer and, if the information content is available on the first host computer, initiating downloading the information content from the first host computer to a predetermined target computer.

Abstract: Dialkyl urea compounds are described which act as calcitonin mimetics. These compounds are useful in the treatment of diseases which are associated with bone resorption. The calcitonin mimetics of the present invention are also useful in assays for the determination of calcitonin receptor activity.

Abstract: A process of fabricating a light alloy casting, such as an aluminum alloy casting, including at least one metal insert includes applying a coating of lampblack to a face of the insert intended to be in contact with the alloy of the component and casting the component with the molten alloy in a mold cavity in which the insert is positioned. Applications include fabricating engine blocks with integrally cast liners made of cast iron.

Abstract: The invention provides a rapid approach for combinatorial synthesis and screening of combinatorial libraries of bicyclic guanidine compounds. The present invention further provides the compounds made by the combinatorial synthesis and individually as well as methods of using the same.

Abstract: A process for molding a casting made of light alloy comprises the steps consisting in:

Abstract: Dialkyl urea compounds are described which act as calcitonin mimetics. These compounds are useful in the treatment of diseases which are associated with bone resorption. The calcitonin mimetics of the present invention are also useful in assays for the determination of calcitonin receptor activity.

Abstract: Dialkyl urea compounds are described which act as calcitonin mimetics. These compounds are useful in the treatment of diseases which are associated with bone resorption. The calcitonin mimetics of the present invention are also useful in assays for the determination of calcitonin receptor activity.

Abstract: A hypodermic syringe head with tamper-evident closure for a syringe barrel, having an injection cannula (4) which is mounted in a cannula carrier (5) from which it protrudes on both axial ends and which is disposed in a cannula carrier guide, so as to be movable relative thereto, and a cannula guard cap (1) , which is adjoined via a rated breaking point (2) by an anchoring element (3) that solidly holds the cannula carrier guide and can be affixed to the barrel neck, wherein a sealing disk (7) is received in the anchoring element, and two axially symmetrical guide grooves (15) for a guide peg (16) of the cannula carrier guide are embodied on the circumference of the cannula carrier, the guide grooves extending at a predetermined inclination substantially to form a V and opening into one another on their end toward the sealing disk, and in the unactuated state of the hypodermic syringe head, the guide peg engages the orifice region (15') of the guide grooves that is oriented toward the sealing disk, and upon a

Abstract: The invention provides a rapid approach for combinatorial synthesis and screening of libraries of hydantoin and thiohydantoin compounds. The present invention further provides the compounds made by the combinatorial synthesis.