摘要:
Polyolefins having a broad molecular weight distribution are obtained in a very high yield even using a catalyst based on a reaction product of a magnesium alcoholate with titanium tetrachloride, if the hydrocarbon-insoluble product of the reaction of the magnesium alcoholate with titanium tetrachloride is heated to a fairly high temperature with a chloroalkoxytitanate, in order to split off alkyl chlorides.
摘要:
Polyolefins having a broad molecular weight distribution are obtained in a very high yield even using, as the catalyst, a product from the reaction of a magnesium alcoholate with titanium tetrachloride, if the reaction between the magnesium alcoholate and the titanium tetrachloride is carried out at a relatively low temperature and the reaction mixture is then heated to a fairly high temperature in order to split off alkyl chlorides.
摘要:
When reacting the reaction product of silicon dioxide and/or a metal oxide and a Grignard compound with a soluble titanium compound, there is obtained a catalyst for the polymerization of 1-olefins, which gives a very high yield and allows a good control of the molecular weight by means of hydrogen without making necessary a separation of the excess of metallo-organic compounds and/or the excess of titanium compounds from the catalyst carrier.
摘要:
A doll having a body and a speech mechanism within the body, wherein the speech mechanism plays a first emotional speech phrase upon the activation of a switch at a first location within the doll's body and a second emotional speech phrase at a second location within the doll's body.
摘要:
Systems, methods and computer program products for producing dental restorations that can include the use of a computer integrated manufacturing system. Using this system, physical properties of a tooth are collected, for the automated manufacturing of a dental restoration. The invention, in one embodiment, includes creating a color map comprising at least one color value, a computer program product for producing a dental restoration layer, as well as a method for producing a dental restoration using a computerized system.
摘要:
In an arrangement for operating valves of an internal combustion engine by means of at least two operating members for opening and closing each valve and a camshaft with cams having base portions and camming portions for operating the operating members wherein the operating members for a valve are disposed in side-by-side relation and have guide bores which are aligned when the operating members are disposed on the base portions of the cams and a coupling pin is movable in the guide bores and couples the adjacent operating arms when disposed so as to extend thereacross for movement of said adjacent operating members in unison, the coupling pin is barrel-shaped wife tapered end sections and a center section of a larger diameter which, with the guide bores of the adjacent operating members, forms a cylindrical fit with a clearance of 1-60 .mu.m.
摘要:
An installation for preheating the suction or intake mixture of a carburetor internal combustion engine by means of an exhaust gas branch line branching off from an exhaust gas pipe system that is equipped with an exhaust gas manifold, and extending along parts of the suction pipe system in heat-exchanging relationship therewith, and which also includes a closure valve controlling the exhaust gas partial stream flowing through the branch line; a part of the exhaust gas pipe system is constructed as Venturi pipe of a gas jet pump and the exhaust gas branch line is connected downstream of the heat-exchange area with an annular space of the gas jet pump surrounding the Venturi pipe so that by the suction in the gas jet pump the branched-off exhaust gas partial stream is sucked back into the remaining exhaust gas stream, while the closure valve is arranged in the exhaust gas branch line.
摘要:
There is disclosed an improved bulk-suspension process for polymerizing vinyl aromatic monomers in the presence of an ethylene-propylene-nonconjugated diene-rubber, which comprises using, in the suspension polymerization step, peroxy-carbonic esters as the polymerization initiator. The process of the invention yields products having improved notched impact strength, weatherability and elongation at break combined with a good shear stability.
摘要:
Provided is a direct thermal media containing a regular repeating pattern of color-forming thermally-imageable stripes printed parallel to the print head element line and a system for using such direct thermal media in color direct thermal printers including an optical registration system optimized for use with this media and an image processing unit that monitors the position of the stripe pattern relative to the print head and synchronizes the start of the printing process. This direct thermal media together with the optical registration system and image processing unit comprise an operative system in that the design of the thermal media, the optical registration system and image processing unit used to control printing are optimized for use with each other. This system may be utilized, for example, in color thermal printers for documents, receipts, tags, tickets or labels.
摘要:
A cylinder head for air-compressing, self-ignition fuel-injection internal combustion engines has four valves per cylinder and an auxiliary combustion chamber between the inlet ducts of the inlet valves. In order to achieve a structurally stiff inclusion of the auxiliary combustion chamber in the cylinder head housing, the cylinder head top located between a coolant space and a control space is set at an angle in the transverse direction in such a way that the auxiliary combustion chambers are immediately adjacent to the cylinder head top and can be cast jointly with the cylinder head.