摘要:
1,1′-Biphenyl-2,2′-diphosphines having at least one amine substituent in the para position relative to the phosphine group and having the formulae are ligands for metal complexes which serve as catalysts for asymmetric addition reactions of prochiral organic compounds and whose catalytic properties can be tailored specifically to particular substrates by substitution of the amine group.
摘要:
Device for joining book block and book cover includes conveyor device, embodied to lift a book block from a lower position into an upper position, and an adhesive application station applying adhesive to the outsides of the book block. Conveyor device and the adhesive application station are arranged so adhesive is applied to the outsides of the book block as it is conveyed by the conveyor device. A removal station is arranged below the adhesive application station and the conveyor device is structured to reverse a direction of movement and to lift and lower the book block and cover in a same vertical plane between the lower position and the upper position. Adhesive application station deactivates adhesive dispensing during the downward movement of the book block with cover.
摘要:
The present invention relates to a method for selectively precipitating anionic surfactant ions from a liquid sample comprising anionic surfactant ions and nucleic acids, as well as to a kit for the isolation and purification of nucleic acids.
摘要:
A method of forming a field effect transistor comprising a gate formed on an insulating layer, the gate having, in a zone in contact with the insulating layer, a semiconducting central zone and lateral zones in the length of the gate, the method comprising forming a gate comprising a portion of insulating layer, a portion of semiconducting layer formed over the insulating layer, and a portion of mask layer formed over the semiconducting layer; performing an etching of the portion of the mask layer such that only a portion in the center of the gate remains; and reacting the semiconducting gate with a metal deposited over the gate.
摘要:
The invention resides in a hydraulic cylinder (23) for a hydraulic drawing cushion (20) of a drawing press (10). The hydraulic cylinder (23) includes a first operating chamber (47), a second operating chamber (48), and a third operating chamber (53). An annular piston (45) with a first piston surface area (49) and a second piston surface area (50) separates the first operating chamber (47) from the second operating chamber (48). The first and the second piston surfaces (49, 50) have the same size. A front surface of the piston rod (33) forms a third piston surface (54) which is larger than the first and second piston surfaces. The third piston surface (54) delimits the third operating chamber (53) of the hydraulic cylinder (23). The first and the second operating chambers (47, 48) are provided for controlling the position and/or the movement of the piston rod (33). The third operating chamber (53) serves to control the metal sheet clamping force of the drawing press via the piston rod (33).
摘要:
A process for forming a wire portion in an integrated electronic circuit includes epitaxially growing the wire portion on a side surface of a seed layer portion (11, 12). Cross-sectional dimensions of the wire portion correspond to a thickness of the seed layer portion and to a duration of the growing step. The seed layer portion is then selectively removed while the wire portion is retained fixedly on the circuit. Afterwards, heating of the circuit can cause the wire portion becoming rounded in cross-section. The wire portion obtained may be about 10 nanometers in diameter. It may be used for forming a channel of a MOS transistor devoid of short channel effect.
摘要:
In an exhaust gas turbocharger for an internal combustion engine of a motor vehicle with a turbine comprising a turbine housing with at least a first and a second spiral channel, each being coupled to an exhaust gas line of an exhaust gas tract of the internal combustion engine for conducting exhaust gas to a turbine wheel arranged within the turbine housing and driving a compressor wheel of a compressor of the exhaust gas turbocharger, an area ratio Qg of the turbine corresponds to the formula Qg=(Aλ+AAGR)/AR>0.40, wherein Aλ refers to a narrowest flow cross-section of the first spiral channel, AAGR to a narrowest flow cross-section of the second spiral channel (52b) and AR to a wheel exit flow cross-section of the turbine exhaust channel. The invention further relates to a motor vehicle with an internal combustion engine and such an exhaust gas turbocharger.
摘要:
In a turbine housing, for an exhaust gas turbocharger of an internal combustion engine with an exhaust gas guide section which has at least one spiral channel that can be coupled to an exhaust path of an exhaust tract and a reception chamber for accommodating a turbine wheel arranged downstream of the at least one spiral channel, at least one first and one second partial housing are provided, which include complementary wall regions of the at least one spiral channel and which are joined so as to form the at least one spiral channel. Also, an exhaust gas turbocharger with such a turbine housing is provided and a method for producing such a turbine housing.
摘要:
An apparatus for drying laundry including a process air system for guiding a process air stream along a process air path having a treatment chamber therealong at which the process air stream contacts laundry, a first fan for moving the process air stream, a cooling location of a heat exchanger, a heating location of a heat pump downstream of the heat exchanger, and a heater in addition to the heat pump for heating the process air stream; and a secondary air system for guiding a secondary air stream along a secondary air path, the secondary air path including a second fan for imparting motion to the secondary air stream, a heating location of the heat exchanger, and a cooling location of the heat pump, and, within the secondary air path, the cooling location of the heat pump is located downstream of the heating location of the heat exchanger.
摘要:
The invention relates to a process for selective, reversible adsorption of nucleic acids to a support material, which process is characterized in that (a) a nucleic acid-containing mixture having a cosmotropic salt content of at least 1 mole is contacted with said support material, whereupon the nucleic acid(s) is (are) adsorbed from said nucleic acid-containing mixture to said support material, and (b) the nucleic acid(s) bound to the support material is (are) detached from the support material by means of an aqueous solution having a salt content of no more than 1 mole.