摘要:
Skeletal isomerization of n-alkenes into isoalkenes and enrichment of isoalkenes in alkene-containing hydrocarbon mixtures is effected in the presence of an isomerization catalyst containing a microporous silicon-containing alumophosphate.A goal of the method for skeletal isomerization is to provide a running time in one operating period of over 100 hours. This goal is achieved by using, as isomerization catalysts, microporous alumophosphates with a molecular sieve structure whose pore inlet openings have a diameter of 0.4 to 0.6 nm which are mixed with a binder and activated at temperatures of 623 to 873K.
摘要:
The invention relates to a rolled-up plain bearing bush made from a metal/plastic composite plain bearing material whose wall has a thickness of at least 0.75 mm and which can be pressed into an opening of said bearing to form a medium-force fit. The inventive bearing bush also comprises a metal supporting layer and a sliding layer. In order to reduce weight and corrosion, the plain bearing bush is characterized in that the metal supporting layer is made of an aluminum alloy and the sliding layer consists of an expanded aluminum metal alloy section and a mixture of plastic sliding material that is applied to the expanded metal section and in the openings thereof in addition to optionally containing fillers that improve caloric conductibility and tribiological properties and the supporting layer is glued using an additional PFA-layer arranged therebetween.
摘要:
A below-knee prosthesis in which an adapter is displaceable and fixable in relation to the lower socket end on a circular segment surface whose circular arc lies in the sagittal and frontal plane and whose midpoint is the center of the knee.
摘要:
A roll-formed bushing for sliding surface bearings has no machining allowance in the bearing bore and is made of a strip section and has a butt joint that extends throughout the width of the bearing. In order to reduce the allowances of the bore diameter and the outside diameter of the bearing bushing, the butt joint has been closed by charge carrier beam welding.
摘要:
A sheet material for sliding surface bearings comprises an expanded metal mesh which consists of a wrought aluminum alloy and is coated with a mixture of polytetrafluoroethylene, filler and glass fibers. The bond strength is increased by coating the surface of the expanded metal mesh with a primer layer.
摘要:
Systems and methods are provided for detecting a movement of an object marked with a marker. The system includes a sensor configured to capture a first image of the marker and to capture a second image of the marker after the first image, each of the first and second images having pixels each having a visual intensity. A controller is configured to compare the first image and the second image by comparing the visual intensity of each of the pixels of the first image and the second image, determine an area of overlap between the first image and the second image based on the comparison, calculate a change in position of the marker in the second image relative to the marker in the first image based on the area of overlap, and detect the movement of the object based on the change in position of the marker.
摘要:
In a process for the casting of a mounting which is to be attached to the human body and which takes the form of a prosthesis socket or of an orthosis part, a reinforcement in the shape of a grid or frame located in the core region is surrounded by a polyurethane in such a way as to eliminate separation of the individual layers. The process is characterized by the following steps in the stated sequence: a) at the position of a PU sublayer which is below the reinforcement, a spacer material which can be saturated with the incompletely reacted polyurethane and which takes the form of the desired limb-proximal PU sublayer, b) the reinforcement in the shape of a grid or frame is produced thereon, c) the reinforcement is removed, d) the first polyurethane sublayer is cast with saturation of the spacer material, e) the reinforcement is again superposed on the polyurethane surface of the first polyurethane sublayer in a state of polymerization after achievement of dimensional stability, f) a further spacer material which can be saturated with the incompletely reacted polyurethane and takes the form of the desired further PU sublayer is applied and g) the further PU sublayer is cast with saturation of the second spacer material, so that where the two PU sublayers come into contact during hardening of the polyurethane of the superposed PU sublayer the two PU sublayers bond reactively with the aid of a primer applied between the PU sublayers and/or via a shared hardening process of the two PU sublayers and enclose the reinforcement.
摘要:
Hose belt conveyor (1), comprising an elongated belt 2) which can be folded to a closed hose. At the edges it is provided with thickened parts (3) which are placed resting against each other during the formation of the hose. These thickened parts bound a V-shaped part which widens in the direction away from the hose which has been formed by the belt (2). The V-shaped part is placed between two drive rollers (12). By selecting the angle of the V-shaped part between 30 and 90.degree., it has been found that it is possible to provide for the hose belt conveyor (1) to be driven like a V-belt. The invention also relates to a drive unit (7) for the above-described hose belt conveyor.
摘要:
Synthetic crystalline aluminosilicate of the pentasil type and method for using the same as catalysts or catalyst components in petrochemical processes for the catalytic conversion of hydrocarbons and their derivatives into useful organic compounds and intermediates.
摘要:
An economical and environmentally safe method for synthesizing wide-pore aluminophosphate crystalline molecular sieves primarily involves inorganic synthesis requiring no structure-directing organic templates. In addition to aluminium and phosphate, further components selected from group IV of the periodic table of elements can be added to synthesize multi-component phosphate molecular sieves such as germano-silico-alumino-phosphate crystalline structures.