摘要:
Chiral selectors having α-unsubstituted β-amino acid derivatives of the structure: a stationary phase for separating substance mixtures containing the chiral selector, and processes for separating mixtures of chiral substances, including enantiomers, and especially enantiomers of substances selected from β-amino acids and derivatives thereof, α-amino acids and α-hydroxy acids are provided.
摘要:
A process for filling a tube with granular material, which material is guided downwardly in a vertically oriented tube along a line provided with flexible elements in the shape of wires which are arranged substantially to the line, and having a radial dimension which is smaller than the inner diameter of the tube, the line being removed from the tube as the latter is filled with the granules, the line being moved during the removal movement with a non uniform speed which is related to the filling speed of the device.
摘要:
A cold gas spraying method and device, whereby the sprayed particles are accelerated in a gas flow. A powder tube and an outer nozzle body together form a Laval nozzle that produces high gas flow velocities. The injection of the sprayed particles occurs in the divergent section of the Laval nozzle.
摘要:
A dielectric barrier discharge lamp comprises a discharge vessel that has a principal axis, the discharge vessel encloses a discharge volume filled with a discharge gas. The discharge vessel further comprises end portions intersected by the principal axis. There are at least one electrode of a first type and at least one electrode of a second type in the lamp. The electrodes of one type are energized to act as a cathode and the electrodes of other type are energized to act as an anode. The electrodes are substantially straight, elongated and have a longitudinal axis substantially parallel to the principal axis of the discharge vessel. These electrodes are positioned within the discharge volume. The electrodes of at least one type are isolated from the discharge volume by a dielectric layer. A dielectric barrier discharge lamp is also disclosed, in which the electrodes are arranged within the discharge volume in groups, and each of the groups comprises one electrode of the first type and at least one electrode of the second type.
摘要:
A DC converter for stepping down DC voltage having two input terminals (E1, E2) to be connected to an input DC voltage source with a high voltage level; two output terminals (A1, A2) for taking a regulated low output DC voltage; a coil (TS) having a center tap (MA) and connected at one end (TA1) with a first one (E1) of the input terminals via an electronic switch device (MOS) and at the other end (TA2) with the second input terminal (E2) via a first capacitor (C1); the charging voltage of the first capacitor (C1) forming the output DC voltage; a second capacitor (C6) connected at one end with a node located between switching device (MOS) and coil (TS) and at the other end with the center tap (MA) via a first diode (D2); a control device (EV, PWM for comparing the charging voltage of the second capacitor (C6) with a reference voltage (REF) and rendering the switch device (MOS) conductive and non-conductive with a pulse-frequency modulated and/or pulse-width modulated switching pulse sequence depending on the result of comparison; and a second diode (D1) connected between the center tap (MA) and the second input terminal (E2); the two diodes (D1, D2) being poled to conduct current toward the second capacitor (C6) or away from the second input terminal (E2) with respect to the potential occurring on the center tap (MA) when the switch device (MOS) is nonconductive.
摘要:
A crane for raising and lowering a load, which crane includes a vehicle frame with end areas and a slewing device arranged on the vehicle frame. The slewing device includes at least two basic slewing columns slewable by 360.degree., mounted on the vehicle frame in the vehicle frame end areas. Additionally, a separate articulated slewing arm having at least two elements is located on each basic slewing column.
摘要:
The invention provides a novel photosensitive recording material in the shape of a multilayer element comprising(i) a photopolymerizable or photocrosslinkable relief-forming layer (RL) of a thickness from 0.1 to 6000 .mu.m and(ii) a dimensionally stable support layer.The said relief-forming layer (RL) consists essentially of an ionic polymer, of one or more photoinitiators and, if desired, of one or more photopolymerizable monomers.The said ionic polymer contains(A) from about 45 to 90% by weight, based on the ionic polymer, of a polymer main chain formed from an alkadiene polymer A',(B) from about 6 to about 45% by weight, based on the ionic polymer, of one or mored olefinically unsaturated side radicals having the structure (I), ##STR1## where R.sup.1 and R.sup.2 are different and are each H or a carbon atom of A',R.sup.3 is a polyvalent, straight-chain or branched C.sub.1 -C.sub.20 -alkylene radical whose chain or branches may be interrupted by --O--, --N-- or --S--,X is --O--, --S-- or --NH--,Y is a polar group,Z is --CH.sub.2 --, --O--, ##STR2## R.sup.4 is H or CH.sub.3, Q is --COOH or --COO.sup..crclbar.,m is an integer from 1 to 3, and(C) from about 0.5 to about 10% by weight, based on the ionic polymer, of cations selected from the group consisting of cations of elements of the main groups I to V, of the subgroups I to VIII and of the lanthanide series of the periodic table of elements, of ammonia, of polyfunctional organic amines, and of hydrazine.In addition, the said ionic polymer may contain further side radicals D which are not photopolymerizable.The novel photosensitive recording material is highly suited for the production of printing plates, relief plates and photoresists.
摘要:
In magnetic recording media consisting of a nonmagnetic base and, firmly applied to this, one or more magnetic layers based on a magnetic material finely dispersed in organic binders, the binder consists of not less than 50% by weight of a high molecular weight branched polyurethane elastomer possessing OH-containing urea groups at the chain ends.
摘要:
A multi-layer element for the production of printing plates and relief plates which is based on an elastomeric polymer binder and is firmly anchored to a polyester base by means of an adhesive layer. The adhesive layer consists of a thermally hardened mixture which is insoluble in aromatic hydrocarbon solvents or aliphatic halohydrocarbon solvents and contains (c1) from 90 to 40% by weight, based on the sum of (c1) and (c2), of an hydroxyl-containing polyurethane, hydroxyl-containing epoxy, hydroxyl-containing phenoxy resin, polyester-ol or polyether-ol resin which has been hardened and crosslinked with isocyanate, and which has from about 4 to 20% by weight, based on the non-crosslinked and hardenable resin, of free OH groups before hardening and crosslinking with isocyanate, and (c2) from 10 to 60% by weight, based on the sum of (c1) and (c2), of an OH-free polycarbonate which is compatible with the resin (c1) before the latter is hardened and crosslinked.
摘要:
A reformer tube processing and filling system is provided for ensuring uniformity of reformer tube flow rates and reactivity. The disclosed invention provides a system for detecting and removing tube obstructions, as well as an automated process for verifying the flow rate for each tube and identifying tubes with abnormal flow rates to remove a source of human error and conserve labor costs. An automated tube filling system provides a calibrated fill mechanism coordinated with a calibrated loading rope withdrawal mechanism to ensure loading consistency. A lack of vibrating parts ensures a low dust count, and what little dust is present is removed via a built-in vacuum outlet in the loader.