Abstract: Provided is a sandwich component with a core which comprises a foam material. A fibrous sheet-like material arranged in the foam material at least partially encloses a working region of the sandwich component in a sheet-like manner. At least one strut is incorporated in the foam material and extends from an entry surface of the foam material from outside the working region to at least the fibrous sheet-like material.

Abstract: The invention relates to a method and a device for damping the displacement of construction machines, in particular wheel loaders, comprising working equipment that is driven by means of a hydraulic cylinder, a hydraulic source, a controlled valve for supplying the hydraulic cylinder with hydraulic fluid, a regulator unit comprising control software, in addition to an acceleration sensor.

Abstract: An ideal quartz glass for a wafer jig for use in an environment having an etching effect is distinguished by both high purity and high resistance to dry etching. To indicate a quartz glass that substantially fulfills these requirements, it is suggested according to the invention that the quartz glass is doped with nitrogen at least in a near-surface area, has a mean content of metastable hydroxyl groups of less than 30 wt ppm and that its fictive temperature is below 1250° C. and its viscosity is at least 1013 dPa·s at a temperature of 1200° C. An economic method for producing such a quartz glass comprises the following method steps: melting an SiO2 raw material to obtain a quartz glass blank, the SiO2 raw material or the quartz glass blank being subjected to a dehydration measure, heating the SiO2 raw material or the quartz glass blank to a nitriding temperature in the range between 1050° C. and 1850° C.

Abstract: A method and an apparatus facilitate the processing of a core structure for a composite sandwich structure. The core has an open three-dimensional structure and is not self-supporting due to an insufficient strength or stiffness. The method involves temporarily providing a support arrangement on the core structure to mechanically support and stabilize it, then subjecting the supported core structure to the desired processing, and then separating and removing the core structure and the support arrangement from one another. The processing can involve immersion into a processing liquid such as a curable resin, or mechanical machining operations. The support arrangement preferably includes a core impression that is surfacially form-fitting on a structured surface of the core structure. The apparatus includes a support arrangement including a core impression to be disposed on a surface of the core structure. The core impression may be formed of a polymer, a metal, or a casting material.

Abstract: The present invention relates to a method for producing a core structure. Firstly, a first core structure and a second core structure are fastened. The first core structure and the second core structure are positioned at a defined distance. A reinforcement element is introduced into a cavity between the first core structure layer and the second core structure layer. The reinforcement element, the first core structure layer, and the second core structure layer form a self-supporting core structure.

Abstract: In one embodiment, the present application relates to a process of making a compound of formula I. and to certain intermediate compounds that are made within the process of making the compound of formula I.

Abstract: The present invention provides for a process for preparing racemic methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate, its corresponding salt: (2S, 3R, 4S)-methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate di-p-toluoyl-D-tartaric acid (“D-DTTA”) salt or a (2R, 3S, 4R)-methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate di-p-toluoyl-L-tartaric acid salt (“L-DTTA”) in a high enantiomeric excess. This invention also provides for a process for preparing a (2S, 3R, 4S)-methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate dibenzoyl-D-tartaric acid (“D-DBTA”) salt or a (2R, 3S, 4R)-methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate L-tartaric acid (“L-DBTA”) salt in a high enantiomeric excess. Further, this invention provides a process for preparing intermediates II, IIB, III, IV, IV salt, V, VI, and VII.

Abstract: To provide an optical component of quartz glass for use in a projection objective for immersion lithography at an operating wavelength below 250 nm, which component is optimized for use with linearly polarized UV laser radiation and particularly with respect to compaction and birefringence induced by anisotropic density change, it is suggested according to the invention that the quartz glass should contain hydroxyl groups in the range of from 1 wtppm to 60 wtppm and chemically bound nitrogen, and that the mean hydrogen content of the quartz glass should be in the range of 5×1015 molecules/cm to 1×1017 molecules/cm3.

Abstract: A composite armor element for protection against projectiles. At least one layer of effective bodies is disposed in rows next to one another in the composite armor element, the effective bodies being embedded in a matrix material. The effective bodies of one row are fixedly interconnected at least partially by means of webs to form a chain which is a monolithic element. An effective body element for insertion in a composite armor element comprises at least two effective bodies fixedly interconnected by at least one web to form a chain. The effective body element is a monolithic element, and a plurality of effective body elements are embedded in a matrix material.

Abstract: Producing a composite structure involves providing a core structure having a folded configuration with fold valleys forming open channels extending along the valleys, and then forming a local reinforcement zone in the core structure itself, before applying any cover layer onto the core structure. The method may further involve applying two cover layers on two opposite sides of the core structure to form a composite sandwich structure, after the local reinforcement zone has been formed in the core structure. A core structure preferably has a local reinforcement zone formed by two molded bodies, e.g. of cured synthetic resin or foam, arranged form-fittingly on the opposite sides of the core.

Abstract: A composite sandwich structure is produced by providing a core structure, applying cover layers on opposite sides of the core structure, and forming an edge seal. The core structure has a folded cell structure with fold valleys forming continuous open channels with open ends and/or open channel sides at edges of the core structure. The channels extend along and are bounded between the fold valleys and the cover layers. The edge seal is formed to have a limited spatial volume in an edge region at an edge of the core structure, to close and seal open ends and/or open channel sides of the channels of the core, without an uncontrolled penetration of the seal material from the edge region to a greater depth into the open channels.

Abstract: A device for the variable setting of the control times of gas exchange valves of an internal combustion engine, having an inner rotor (3) and an outer rotor (4), with one of the components being rotationally fixedly connected to the camshaft (2) and the other component being drive-connected to a crankshaft, the outer rotor (4) being rotatably mounted on the inner rotor (3) and, at least one hydraulic chamber (7), which is delimited by side walls (5, 6) and the inner rotor (3), is formed on the outer rotor (4), the inner rotor (3) comprises a hub part (3b) and at least one vane (3a), with a vane (3a) of the inner rotor (3) extending into each hydraulic chamber (7) and dividing the latter into two pressure chambers (10, 11) which act counter to one another.

Abstract: Methods for producing a quartz glass component with reflector layer are known in which a reflector layer composed of quartz glass acting as a diffuse reflector is produced on at least part of the surface of a substrate body composed of quartz glass. In order, taking this as a departure point, to specify a method which enables cost-effective and reproducible production of uniform SiO2 reflector layers on quartz glass components, it is proposed according to the invention that the reflector layer is produced by thermal spraying by means of SiO2 particles being fed to an energy carrier, being incipiently melted or melted by means of said energy carrier and being deposited on the substrate body. In the case of a quartz glass component obtained according to the method, the SiO2 reflector layer is formed as a layer which is produced by thermal spraying and has an opaque effect and which is distinguished by freedom from cracks and uniformity.

Abstract: A method known in prior art for determining the occupation of the surface of a silica glass component with impurities comprises taking a sample, a process in which at least some of the surface of the silica glass component is brought in contact with an acidic desorption solution, and surface impurities that are to be analyzed are accumulated therein and are subjected to an element-specific analysis. The aim of the invention is to create a method which is based on said method, allows the occupation of the surface of silica glass components to be determined accurately and reproducibly, and is suited for determining small amounts of impurities within the order of magnitude of 1010 atoms/cm2 also directly in situ. Said aim is achieved by the fact that taking the sample encompasses contacting the component surface with an acidic desorption solution containing water, nitric acid, and hydrofluoric acid, the nitric acid concentration in the desorption solution amounting to 1.

Abstract: A known SiO2 slurry for the production of quartz glass contains a dispersion liquid and amorphous SiO2 particles with particle sizes to a maximum of 500 ?m, wherein the largest volume fraction is composed of SiO2 particles with particle sizes in the range 1 ?m-60 ?m, as well as SiO2 nanoparticles with particle sizes less than 100 nm in the range 0.2-15% volume by weight (of the entire solids content). In order to prepare such a slurry for use, and to optimize the flow behavior of such a slurry with regard to later processing by dressing or pouring the slurry mass, and with regard to later drying and sintering without cracks, the invention suggests a slurry with SiO2 particles with a multimodal distribution of particle sizes, with a first maximum of the sizes distribution in the range 1 ?m-3 ?m and a second maximum in the range 5 ?m-50 ?m, and a solids content (percentage by weight of the SiO2 particles and the SiO2 nanoparticles together) in the range 83%-90%.

Abstract: A device for variably adjusting the control times of gas-exchange valves of an internal combustion engine. The device has a drive input element and a drive output element, The drive input element is placed in driving connection with a crankshaft of the internal combustion engine, the drive output element is arranged so as to be pivotable with respect to the drive input element, and the device is fastened to a camshaft which has a hollow shaft and an inner shaft which is arranged concentrically with respect to the hollow shaft. An improved mounting arrangement of the concentrically arranged shafts with respect to one another is proposed.

Abstract: An apparatus for variable setting of control times of gas exchange valves of an internal combustion engine which has a drive element, an output element and a side cover. The drive element is brought into drive connection with a crankshaft, the ouput element is brought into drive connection with a camshaft, and the output element is arranged such that it can be pivoted with respect to the drive element. The side cover, which has a sealing cover with an opening and a mating element, axially delimits the ouput element and/or the drive element, and is connected in a rotationally fixed manner to the drive or output element by means of a fastening element. The fastening element reaches at least partially through the opening and interacts with the fastening element producing a rotationally fixed connection between the side cover and output element or drive element.

Abstract: The invention pertains to a method for reinforcing cellular materials (1), a reinforced sandwich construction (5) as well as a correspondingly equipped aircraft. In the method, a cellular material (1) is provided with fiber bundles (3) that are introduced into the cellular material (1) with a needle (8). In this case, the needle (8) initially pierces a through-hole (2) into the cellular material (1) from one side in order to subsequently take hold of a fiber bundle (3) situated on the other side with the needle (8) and pull said fiber bundle into the cellular material (1).

Abstract: In one embodiment, the present application relates to a process of making a compound of formula I. and to certain intermediate compounds that are made within the process of making the compound of formula I.

Abstract: The present invention provides for a process for preparing racemic methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate, its corresponding salt: (2S, 3R, 4S)-methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate di-p-toluoyl-D-tartaric acid (“D-DTTA”) salt or a (2R, 3S, 4R)-methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate di-p-toluoyl-L-tartaric acid salt (“L-DTTA”) in a high enantiomeric excess. This invention also provides for a process for preparing a (2S, 3R, 4S)-methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate dibenzoyl-D-tartaric acid (“D-DBTA”) salt or a (2R, 3S, 4R)-methyl 6,6-dimethyl-3-azabicyclo[3,1,0]hexane-2-carboxylate L-tartaric acid (“L-DBTA”) salt in a high enantiomeric excess. Further, this invention provides a process for preparing intermediates II, IIB, III, IV, IV salt, V, VI, and VII.