摘要:
The invention relates to a procedure for the analysis of surface and depthrofiles of partially or completely electrically non-conductive specimens using the direct bombardment method of the secondary neutral-particle mass spectrometry SNMS; to dissipate otherwise disturbing ion currents, it is being suggested that a high-frequency alternating voltage is applied to the underside of the specimen, the upperside of which is in contact with the low-pressure plasma used in the SNMS procedure, whereby the phase of this voltage is adjusted to such a time sequence that during the negative voltage part of the high-frequency period the specimen is bombarded by positive ions of a constant kinetic energy from the plasma and that the applied ion charge from the influx of plasma electrons is compensated during the positive part of the high-frequency period.
摘要:
A connecting part for Cardan shafts, with a centering member on a drive end, a radial flange and a connecting stub for connecting the Cardan shaft of a motor vehicle on the shaft end, wherein the flange is equipped in its radially outer region with a plurality of prefabricated apertures for balance weights as well as a method for balancing such a connecting part of plastic material, wherein balance weights are inserted into preformed apertures in the flange defined by rotational measurements and are secured in their position by plastic or elastic deformation of the flange.
摘要:
An apparatus for the performance of the SNMS process, having a separate ion source, a sample holder, a system for the production of a radio-frequency plasma and a mass analyzer, in which the ion source and the mass analyzer are disposed side by side on the same side of the chamber provided for the radio-frequency plasma, and in which the sample mounted on the sample holder is situated within the chamber provided for the radio-frequency plasma. This apparatus can be used not only for the performance of the two kinds of SNMS operation (DMB and SBM) but also secondary ion mass spectroscopy (SIMS) under optimum spatial conditions.
摘要:
In a process for the rectification of a raw gaseous mixture under superatmospheric pressure and containing at least three components, e.g. natural gas wherein the gaseous mixture is fractionated in a first rectifying column into a head product largely freed of at least one higher-boiling component and into a bottoms product largely freed of at least one lower-boiling component, the improvement which comprises compressing the liquid bottoms product of the first rectifying column; passing resultant compressed bottoms product in indirect heat exchange relationship with the gaseous mixture to at least partially vaporize said bottoms product; engine-expanding resultant vaporized compressed bottoms product to form a liquid which is then passed as reflux into a second rectifying column; and fractionating resultant expanded bottoms product in said second rectifying column to form a top product containing lower-boiling components and into a sump product containing higher-boiling components.
摘要:
A universal joint assembly having a pair of yokes with yoke arms interconnected by a trunnion cross includes a seal member extending between the trunnion cross and a bushing of the assembly, with the seal including a resilient portion defining a lubricant reservoir from which lubricant may be provided for roller bodies of the assembly in order to insure adequate lubrication and long life. The seal is further provided with ribs which define between the seal and the trunnion cross ducts for lubricant flow from the reservoir to portions of the joint assembly including the roller bodies.
摘要:
A process for the production of cross-linked polyethylene foam layers which have an anisotropic pore structure in at least one internal layer, wherein at least three polyethylene sheets which contain equal quantities of peroxide as cross-linking agent and differing quantities of a chemical blowing agent are arranged as a multilayer structure in such a way that the two external layers are formed by the sheets which contain a smaller proportion of blowing agent, and the structure is heated, preferably in a continuous heating furnace, so that the individual sheets are cross-linked and at the same time welded together to form a laminate which is subsequently foamed by increasing the temperature to between 190.degree. and 250.degree. C.
摘要:
A housing of the gear motor accommodates a pair of meshing gears which are rotatably mounted in the interior of the housing and which each have a first and a second axial end face. Sealing elements are provided which are located proximal to the respective axial end faces, and an arrangement is provided for forming first fluid-pressure fields which press the sealing elements against the axial end faces. Adjacent at least one of these sealing elements there is provided a space in which an auxiliary fluid pressure field can develop, and an arrangement is provided by means of which the space can be pressurized when it is desired to form therein the auxiliary fluid pressure field so that the same may exert auxiliary pressure upon the associated sealing element to aid in pressing the same against the respective axial end face, and by means of which the space can be vented when such auxiliary pressure is not desired.
摘要:
A continuous tensioning ring for mounting convoluted boots, consisting of an annular member rolled from flat strip material so as to be round, with the free ends of the strip being connected to each other. For this purpose the two free ends 12 and 13 are provided with claws 11 whose shapes are adapted to each other, which contact each other in the strip plane by engaging each other in a line-like way and which are caulked together in a force-locking way or spot-welded together in a material-locking way. The tensioning ring 10 is subsequently crimped, i.e. radially upset.
摘要:
The gear machine comprises a housing in which two gears mounted on shaft journals mesh. The shaft journals are supported in bushing or eyeglass-shaped bearing members. Located between the latter and the lateral surfaces of the gears are sealing plates which are brought into sealing contact with the lateral surfaces of the gears by axially-acting pressure fields. Relief grooves are formed circumferentially in the outer circumference of the bearing members and are spaced from and adjacent to the sealing plates. These relief grooves communicate with the low-pressure sdide of the gear machine and attain an optimal sealing action.
摘要:
A drive shaft assembly particulary suited for power transmission in motor vehicles wherein a drive shaft has a universal joint connected to at least one end thereof with a sealing boot attached in sealing engagement between the outer joint member of the universal joint and the drive shaft. The invention is particularly directed to the provision of an elastomeric cover on the outer surface of the drive shaft, the elastomeric cover extending along the shaft from the exterior of the sealing boot to within the region enclosed by the boot in order to provide an arrangement which is resistant to damage, corrosion, and wear and which may be conveniently fitted and assembled. The elastomeric cover may be provided with internal ribs to establish ventilation channels for the shaft assembly.