Abstract: Functionalized silicas with 3-methacryloxypropylsilyl and/or glycidyloxypropylsilyl groups on the surface are prepared by mixing the silicas with the silane and heat-treating the mixture. The silicas are employed, for example, in solvent-containing coatings.

Abstract: A process for photocatalytic removal of organic substances from waste waters, wherein by way of photocatalyst use is made of granulates based on pyrogenically prepared titanium dioxide having the following physicochemical characteristic data: 1 Mean grain diameter: 10 to 150 &mgr;m BET surface: 25 to 100 m2/g pH value: 3 to 6 Compacted bulk density: 100 to 1,200 g/l.

Abstract: Hydrophobic, pyrogenically produced oxides having a ratio of dimethylsilyl groups to monomethylsilyl groups of 100:0 to 50:50 are prepared by using siloxanes or methylsiloxane mixtures D3 to D9 as hydrophobing agent.

Abstract: An open-end spinning arrangement having a yarn withdrawal nozzle (10), by means of which the yarn is withdrawn form its transition zone within the spinning rotor and is rollingly and slidingly deflected while circulating in contact with the yarn withdrawal nozzle, additionally imparting a false twist. The yarn withdrawal nozzle has a depression (24), which is abruptly offset in the circulating direction of the yarn, by which the yarn loses contact with the yarn withdrawal nozzle (10) in the withdrawal direction of the yarn and over an angular area a of at least 10 degrees. Each time the rotating yarn tail sweeps over this depression, the false twist is completely interrupted and the actual twisting of the yarn at the yarn withdrawal nozzle (10) is cancelled.

Abstract: A single-piece optical fiber coupling (1) is specified which has a housing (2) with at least two holder openings (3a, 3b), which are arranged coaxially and run towards each other, for the optical fiber ends (4a, 4b) to be connected, the holder openings (3a, 3b) each having an outer section (3c, 3d) with a threaded crimp (3g) and an inner section (3e, 3f) with a thread (3h) of lower depth.

Abstract: Surface-modified, pyrogenically produced mixed oxides which contain two or more components of the series SiO.sub.2, Al.sub.2 O.sub.3, TiO.sub.2, ZrO.sub.2, Fe.sub.2 O.sub.3, Nb.sub.2 O.sub.5, V.sub.2 O.sub.5, WO.sub.3, SnO.sub.2, GeO.sub.2 and have been surface-modified with one to several compounds of the following groups:(a) organosilanes of the type (RO).sub.3 Si(C.sub.n H.sub.2n+1),(b) R'.sub.x (RO).sub.y Si(C.sub.n H.sub.2n+1),(c) X.sub.3 Si(C.sub.n H.sub.2n+1),(d) X.sub.2 (R')Si(C.sub.n H.sub.2n+1),(e) X(R').sub.2 Si(C.sub.n H.sub.2n+1),(f) (RO).sub.3 Si(CH.sub.2).sub.m --R',(g) (R").sub.x (RO).sub.y Si(CH.sub.2).sub.m --R',(h) X.sub.3 Si(CH.sub.2).sub.m --R',(i) (R)X.sub.2 Si(CH.sub.2).sub.m --R',(j) (R).sub.2 X Si(CH.sub.2).sub.m --R',(k) Silazanes of the type ##STR1## (l) Cyclic polysiloxanes, (m) Polysiloxanes or silicone oils.

Abstract: In a screening machine with a three-dimensional oscillating screening movement and a control unit for converting a given vibration level into the required energy supply for the electromagnet, the results of screening analyses are to be reproducible or comparable; to this end it is provided that the control unit (26) is designed for calculating the machine acceleration as a function of the respective determined vibration level and the simultaneously determined frequency value as a control value for the energy supply to the electromagnet and for the setpoint-actual value comparison of the calculated machine acceleration actual value with a given machine acceleration setpoint value and for compensating a determined machine acceleration deviation by adjusting the energy supply to the electromagnet (21) on the basis of the change in the vibration level calculated as a function of the given frequency.

Abstract: A connector assembly comprises a housing and a secondary locking member for coupling to a complementary connector assembly comprising a housing and a secondary locking member. The housing comprises a central coding cavity that allows insertion therethrough of prismatic coding bars that extend from the secondary locking member. The complementary connector housing similarly comprises a through cavity to allow passage therein of a coding bar of the secondary locking member that is complementary to the coding bar. The secondary locking member can be assembled to the connector housing within a shroud in a preassembled position and then shifted in the direction D to the fully assembled locked position. Similarly, the secondary locking member of the complementary connector can be inserted in the shroud in a preassembled position and then shifted in the direction of arrow D to the fully locked position.

Abstract: The silanized, pyrogenically prepared silicic acids are prepared by treating pyrogenically prepared silicic acids with an organosilane selected from the group (RO).sub.3 SiC.sub.n H.sub.2n+1, in which n--from 10 to 18 and R stands for an alkyl.

Abstract: The silanized, pyrogenically prepared silicic acids which are not dispersed in a solvent are prepared by treating pyrogenically prepared silicic acids with an organosilane selected from the group (RO).sub.3 SiC.sub.n H.sub.2n+1, in which n--from 10 to 18 and R stands for an alkyl.

Abstract: A centrifugal mill exchangeable cassette for laboratory use has a base body a drive motor, including a drive shaft, connected to the base body. A housing with cover enclosing the base body and the drive motor is provided. The housing has a milling chamber. The cover has an inlet opening for feeding materials to be milled to the milling chamber. A rotor is connected to the drive shaft of the drive motor. The rotor is positioned in the milling chamber. An exchangeable cassette with an annular receptacle and with a radially inner wall consisting of an annular sieve and connected to the annular receptacle is provided. The exchangeable cassette is positioned in the housing so as to surround the milling chamber and the rotor for catching the material milled by the rotor in the milling chamber. The exchangeable cassette has a detachable lid covering the milling chamber and the rotor.

Abstract: A mechanical camera shutter requiring voltage in the range of 30 to 60 volts is made to operate from a power supply which provides voltage such lower than is necessary for shutter operation by the inclusion of a capacitor which is charged to 15 volts. The capacitor is operated to add to the insufficient voltage of a power source to provide the requisite high voltage during a critical part of a cycle of operation of the shutter. The shutter driver circuit follows results from the recognition that the shutter requires the high voltage only during the short opening phase of the shutter cycle and is not required during the later holding phase when only a low holding voltage is required. The capacitor is recharged during the holding phase and provides the necessary increased voltage for the next shutter operation.

Abstract: Surface-modified, pyrogenically produced silicon dioxide is obtained by placing a pyrogenically produced silicon dioxide in a know mixing device, spraying it with a chemical compound from the group:CHF.sub.2 --CF.sub.2 --O--(CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3CF.sub.3 --CHF--CF.sub.2 --O--(CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3C.sub.4 F.sub.9 --CH.sub.2 --CH.sub.2 --Si(OCH.sub.3).sub.3C.sub.6 F.sub.13 --CH.sub.2 --CH.sub.2 --Si(OCH.sub.3).sub.3with intensive mixing, subsequently mixing it and tempering the mixture obtained for a fairly long time.

Abstract: Surface-modified, pyrogenically produced aluminum oxide which is has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 50 to 150 Stamping density (g/l) 50 to 90 Drying loss (%) <5 Annealing loss (%) 5.0 to 15 C content (%) 0.5 to 12 pH 4 to 8.

Abstract: Surface-modified, pyrogenically produced titanium dioxide which has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 5 to 120 Stamping density (g/l) 50 to 250 Drying loss (%) <5 Annealing loss (%) 3.5 to 15 Carbon content (%) 0.5 to 12 pH 4 to 10.

Abstract: Surface-modified, pyrogenically produced aluminum oxide which has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 50 to 150 Stamping density (g/l) 50 to 90 Drying loss (%) <5 Annealing loss (%) 5.0 to 15 C content (%) 0.5 to 12 pH 4 to 8.

Abstract: Surface-modified, pyrogenically produced titanium dioxide which is has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 5 to 120 Stamping density (g/l) 50 to 250 Drying loss (%) <5 Annealing loss (%) 3.5 to 15 Carbon content (%) 0.5 to 12 pH 4 to 10.

Abstract: A casing bottom or stub casing for a propelling charge casing whose base plate (1) has an exterior or outer surface which is curved inwardly in an annular region (7) so that the casing bottom is able to sufficiently axially expand under the high gas pressure developing during firing without requiring the use of a high strength material.

Abstract: A subcaliber kinetic energy projectile (1) including a penetrator (2) and a segmented sabot (3) which is provided with a front support (4) and with a second support (5) that is disposed at an axial distance behind the first support, with the second support (5) including a rotationally symmetrical air pocket (6) that faces the first support (4) and the first support (4) is provided with air passage openings (43, 44, 45).In the sabot, the relationship of L/D.gtoreq.1.2 exists between the length L of the penetrator tip (8) ahead of the first support (4) and the caliber D. The relationship x.gtoreq.0.45 * .iota. further applies between the distances x and .iota., with x being the distance between the trailing edge (10) of the sabot and the base surface (11) of the air pocket (6) in the second support (5) and .iota. being the distance between the trailing edge (10) of the sabot (3) and the leading edge (12) of the sabot at the surface of the penetrator (2).

Abstract: A subcaliber projectile including a segmented discardable propelling cage sabot which encloses at least a portion of the projectile body and has a common form-locking zone for the transfer of acceleration forces from the propelling cage to the projectile body. The form-locking zone has mating annular grooves and counter grooves on the exterior surface of the projectile body and on the interior surface of the propelling cage, and is subdivided into several form-locking zone regions in which the annular grooves have a different groove spacing that is adapted to the locally occurring shear stresses. These measures enhance simplification of the manufacturing process and result in an improvement of the release of the propelling cage sabot from the projectile body and in an increase in the target impact velocity of the projectile body.