摘要:
A wafer suitable for epitaxial growth of gallium nitride (GaN) in a Metal Oxide Chemical Vapor Deposition (MOCVD) process. The wafer includes a silicon substrate having a front side and a back side and an edge extending between the front side and the back side, the edge including a front bevel surface connected to the front side and a back bevel surface connected to the back side, wherein the silicon substrate comprises an oxygen denuded silicon layer surrounding a core. The wafer further includes a protection layer being a thermally grown silicon oxide (SiO2) layer substantially covering the front bevel surface and the back bevel surface of the edge, while leaving at least a central region of the front side of the silicon substrate exposed, for preventing meltback during the MOCVD process.
摘要:
Polymers are described comprising a) one or more of the recurring structural units of the formula (1) where R1 is hydrogen, methyl or ethyl and A is C1-C8 alkylene, and Q+ is H+, NH4+, Li+, Na+, K+, ½ Ca++, ½ Mg++, ½ Zn++ or ⅓ Al+++, and the neutralization degree of the structural units of formula (1) is 50 to 100 mol-%, and b) one or more of the recurring structural units of the formula (2) where R1 and A are R1 and A from formula (1) and X+ is [HNR5R6R7]+, where R5, R6 and R7 can independently from each other be hydrogen, a linear or branched alkyl group with 1 to 22 carbon atoms, a linear or branched, simple or polyunsaturated alkenylene group with 2 to 22 carbon atoms, a C6-C22-alkylamidopropyl group, a linear monohydroxyalkyl group with 2 to 10 carbon atoms or a linear or branched dihydroxyalkyl group with 3 to 10 carbon atoms, and wherein at least one of the groups R5, R6 and R7 is not hydrogen.
摘要翻译:描述了包含a)一种或多种式(1)的重复结构单元的聚合物,其中R 1是氢,甲基或乙基,A是C 1 -C 8亚烷基,Q +是H +,NH 4 +,Li +,Na +,K +,½ Ca ++,½Mg ++,½Zn ++或1/3 Al +++,式(1)的结构单元的中和度为50〜100mol%,b)一种或多种式(2)的重复结构单元 )其中R 1和A分别是R 1和A,并且X +是[HNR 5 R 6 R 7] +,其中R 5,R 6和R 7可以彼此独立地是氢,具有1至22个碳原子的直链或支链烷基, 具有2至22个碳原子的直链或支链,简单或多不饱和亚烯基,C 6 -C 22烷基酰胺基丙基,具有2至10个碳原子的直链单羟基烷基或具有3至10个碳原子的直链或支链二羟烷基,其中 基团R5,R6和R7中的至少一个不是氢。
摘要:
Method to improve the barrier properties of composite gas cylinders and high pressure gas cylinder having enhanced barrier properties.The instant invention pertains to a new method for improving the barrier properties of composite gas cylinders for the storage of gas, by wrapping the outer surface of a composite gas cylinder with a plastic film comprising a barrier material in a winding process. The composite gas cylinder comprises an inner liner made of polyolefin and an outer fibre-reinforced, pressure supporting layer. The barrier material may comprise polyamide, polyester, halogen substituted polymer, EVOH or a metallization. The invention pertains also to a high pressure composite gas cylinder having enhanced barrier properties and its use as a fuel tank in gas driven automotive vehicles equipped with a combustion engine.
摘要:
The invention relates to a method or an arrangement for the clock synchronization of a plurality of distributed modules of an information or communication system, said modules being coupled via a packet-switched network. At least two of said modules are controlled by a local clock generator of the modules using an adjustable frequency, and a clock signal is transmitted via the network in the form of clock signal packets in a synchronous minter with respect to the local clock of the modules. One of said at least two modules takes over the function of a master module, and all remaining said at least two modules, the slave module(s), synchronize the local clock of the modules with the clock of the master module, wherein said slave modules ascertain a measurement for the deviation of the local clock generator of the modules relative to the clock generator of the master module by comparing the clock signal transmitted by the master module with the clock signal of the modules and use said measurement in order to regulate the local clock generator of the modules.
摘要:
A method for the improvement of the barrier properties of ethylene homo- or copolymer compositions against permeation of hydrocarbons comprised in liquid fuels or mineral oils is disclosed. The ethylene homo- or copolymer comprises at least one sterically hindered amine compound in an amount of from 100 to 10 000 ppm, calculated on total weight of the polymer. At least one surface of a hollow body made of said ethylene homo- or copolymer is subjected to fluorination.
摘要:
In a satellite control system, a liquid is ejected by thermal ejection from holes in a substrate structure to create a reactive force on the satellite allowing the position, such as the attitude, of the satellite to be adjusted.
摘要:
An ethylene homo- or copolymer composition is stabilized by suitable stabilizers conferring improved resistance against thermo-oxidative degradation, which occurs in the presence of liquid fuels comprising biodiesel, such as vegetable oil esters, in combination with oxygen. The stabilizers comprise a combination of at least two sterically hindered amine compounds or N-hydroxy- or N-oxylderivatives thereof in an amount of from 100 to 10 000 ppm. Such ethylene homo- or copolymer composition is highly suitable for articles of plastic and components for the transport and storage of liquid fuels comprising biodiesel, such as vegetable oil esters, preferably for plastic fuel tanks for automotive vehicles.
摘要:
Polymers are described comprising a) one or more of the recurring structural units of the formula (1) where R1 is hydrogen, methyl or ethyl and A is C1-C8 alkylene, and Q+ is H+, NH4+, Li+, Na+, K+, ½Ca++, ½ Mg++, ½ Zn++ or ⅓ Al+++, and the neutralization degree of the structural units of formula (1) is 50 to 100 mol-%, and b) one or more of the recurring structural units of the formula (2) where R1 and A are R1 and A from formula (1) and X+ is [HNR5R6R7]+, where R5, R6 and R7 can independently from each other be hydrogen, a linear or branched alkyl group with 1 to 22 carbon atoms, a linear or branched, simple or polyunsaturated alkenylene group with 2 to 22 carbon atoms, a C6-C22-alkylamidopropyl group, a linear monohydroxyalkyl group with 2 to 10 carbon atoms or a linear or branched dihydroxyalkyl group with 3 to 10 carbon atoms, and wherein at least one of the groups R5, R6 and R7 is not hydrogen, with the proviso that the molar ratio of the structural units of formula (1), where Q+ is NH4+, Li+, Na+, K+, Ca++, Mg++, Zn++ or Al+++, to the structural units of formula (2) is 97:3 to 55:45 and the formation concentration (CMC)
摘要:
Water-soluble or water-swellable polymers are described, containing a) 20.0 to 98.99 mole percent of one or more independently recurring structural units of the formula (1) and b) 1.0 to 79.99 mole percent of one or more independently recurring structural units of the formula (2), and c) 0.01 to 8.0 mole percent of one or more independently recurring cross-linking structural units, which are obtained from one or more monomers having at least two olefinic double bonds. The polymers are suitable, for example, as thickeners or yield point formers, in particular in cosmetic, dermatological or pharmaceutical compositions.
摘要:
A transmission device has at least one electro-hydraulic transmission control unit and a method of operating the transmission device having a plurality of gear wheel that can be engaged and disengaged from a force flow by fluidically actuated shifting elements. A piston space of a first shifting element, delimited by a second functional surface of the actuating piston of the first shifting element, is made separate from a piston space of a second shifting element, delimited by the first functional surface of the actuating piston, and an area of the second shifting element, that carries an actuating pressure, or an area of the first shifting element, that carries an actuating pressure, is, or can be, connected to the piston space delimited by the second functional surface of the actuating piston of the first shifting element.