摘要:
Sub-micron-structured (nanostructured) polymer film or coatings are made by coating a substrate with a mixture of materials. One of the materials is removed using a selective solvent, leaving pores or other nanostructure. The substrate may be grooved, providing a competing nanostructure. The coating may act as an antireflective coating, optical retarder, optical diffuser, or orientation layer.
摘要:
A joining system head for fixation to a movable frame, in particular to a robot having holding means for an element to be joined to a part, and joining drive means to move the holding means along a joining direction for joining. The holding means is mounted on the joining system head and is rotatable about an axis running transverse to the joining direction.
摘要:
Cylinder head gasket for an internal combustion engine, insertable for sealing of components, at least one of which has a T-junction formed region, containing at least one functional position and at least one distance position as well as at least one additional gasket element, which is provided in the region of the T-junction, whereby the distance position is provided at least in the region of the T-junction with at least one recessed region serving for the intake of the additional gasket element.
摘要:
The invention relates to a method for short-cycle arc welding with drawn-arc ignition, wherein a stud is welded to a piece of sheet metal, with the following steps: provision of a stud having an end face with which the stud is welded to a welding surface of the sheet metal, wherein an integral distinct projection is formed in the end face, placement of the projection on the welding surface and switch-on of an electric pilot current, lifting of the stud from the welding surface, whereby an arc is drawn, establishment of a welding current flowing through the arc in such a manner that the end face and the welding face start to melt, lowering of the welding stud onto the welding surface, wherein the melts at the end face and welding surface mix, and switch-off of the welding current so that the entire melt solidifies to join the stud to the sheet metal in a material-to-material manner, wherein after lifting of the welding stud and before establishment of the welding current, an alternating cleaning current is initially established in a cleaning step that is designed to clean the welding surface and/or the end face of contaminants, such as lubricants or wax, and/or of coatings, for example corrosion-protective coatings of zinc.
摘要:
A locking device for vehicles, especially for aeroplanes, comprising an actively driven drive element provided with an input shaft and an output shaft which is directly or indirectly connected to the input shaft. According to the invention, at least one permanent magnet is associated with the input shaft or the output shaft, the magnet interacting with at least one other external fixed element, especially a permanent magnet.
摘要:
Compounds of formula I: wherein the variables are defined as explained in the disclosure. The invention also provides liquid crystalline mixtures and optical or electro-optical devices including compounds of formula (I).
摘要:
Optically active butane-1,2,3,4-tetraol derivatives of formula (I). The compounds may be used as doping agents for liquid crystals for a wide range of applications, such as solid state cholesteric filters for projection displays, circular polarizers, and optical filters.
摘要:
A flat metal sealing gasket is made as follows: on an unhardened spring steel plate having an aperture and a bead surrounding the aperture, a sinterable powder is deposited along the bead in a desired shape and thickness. Thereafter a sufficiently high temperature is applied to the deposited sinterable powder to effect sintering or melting of the powder to provide a pressure-resistant overlay on the plate and to simultaneously effect a hardening of the plate.
摘要:
The present invention is concerned with optically active, ferroelectric, smectic, photo-cross linkable compounds of the formula ##STR1## wherein A.sup.1 and A.sup.2 may both signify residues of the formula ##STR2## and be the same or different, while A.sup.3 may signify a residue of the formula ##STR3## as well as liquid crystalline mixtures which contain such compounds and their use in the cross-linked state in optical components.
摘要:
An apparatus for providing a vacuum in a segmented tire mold includes an upper sidewall assembly and lower sidewall assembly, a plurality of radially moveable tread mold segments operable with the upper sidewall assembly and lower sidewall assembly to define a tire mold cavity. A conical actuating ring assembly surrounds the tire mold segments and engages the mold segments to provide radial movement of the mold segments. The apparatus includes a first seal between the conical actuating ring assembly and the lower mold assembly, as well as a second seal between the conical actuating ring and the upper sidewall assembly, thereby sealing the space defined by the tire mold so that a vacuum can be drawn on the tire mold cavity upon the closing of the mold.