摘要:
The present invention relates to a process for the activation of double metal cyanide (DMC) catalysts and to a process for the preparation of polyethercarbonate polyols from one or more H-functional starter compounds, one or more alkylene oxides and carbon dioxide in the presence of a double metal cyanide catalyst, characterized in that (α) (α1) the DMC catalyst and one or more H-functional starter compounds are placed in a reactor, (α2) an inert gas, an inert gas/carbon dioxide mixture or carbon dioxide is passed through the reactor at a temperature of 50 to 200° C. and at the same time a reduced pressure (absolute) of 10 mbar to 800 mbar is established in the reactor by removal of the inert gas or carbon dioxide, (β) under an atmosphere of inert gas/carbon dioxide mixture or under a pure carbon dioxide atmosphere, alkylene oxide is added to the mixture from step (α) at temperatures of 50 to 200° C., and (γ) one or more alkylene oxides and carbon dioxide are metered into the mixture resulting from step (β).
摘要:
A memory device is provided, including a back gate including a first portion of electrically conductive material, a first portion of dielectric material arranged on the back gate, a semiconductor nanobeam arranged on the first portion of dielectric material, a second portion of dielectric material covering the semiconductor nanobeam, a portion of material configured to receive electrons and holes, and configured to store electrical charges and covering the second portion of dielectric material, a third portion of dielectric material covering the portion of material configured to perform storage of electrical charges, and a front gate including a second portion of electrically conductive material covering the third portion of dielectric material.
摘要:
The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts.
摘要:
Method of fabricating an electro-mechanical microsystem provided with at least one fixed part comprising a bar, and at least one mobile part in rotation around at least one portion of said bar, the method comprising the steps of: a) formation, inside a layer of at least one given material resting on a support, of at least one bar, b) formation around the bar of at least one first graphene sheet, and of a least one second graphene sheet, separated from the first sheet and mobile with respect to the first sheet.
摘要:
A microelectronic device including, on a substrate, at least one element such as a SRAM memory cell; one or more first transistor(s), respectively including a number k of channels (k≧1) parallel in a direction forming a non-zero angle with the main plane of the substrate, and one or more second transistor(s), respectively including a number m of channels, such that m>k, parallel in a direction forming a non-zero angle, or an orthogonal direction, with the main plane of the substrate.
摘要:
A method of manufacturing at least one nanowire, the nanowire being parallel to its supporting substrate, the method including the formation on the supporting substrate of a structure comprising a bar and two regions, a first end of the bar being secured to one of the two regions and a second end of the bar being secured to the other region, the width of the bar being less than the width of the regions, the subjection of the bar to an annealing under gaseous atmosphere in order to transform the bar into a nanowire, the annealing being carried out under conditions allowing control of the sizing of the neck produced during the formation of the nanowire.
摘要:
The present invention relates to a process for continuously preparing diaryl carbonates from dialkyl carbonates and at least one monohydroxyl compound in the presence of catalysts, and to the use thereof for preparation of polycarbonates. The alkylene glycol obtained in the preparation of the dialkyl carbonate used is recycled by oxidative carbonylation with carbon monoxide in the presence of a catalyst to give the cyclic alkylene carbonate which is in turn converted to the dialkyl carbonate. More particularly, the process utilizes the alkylene glycol obtained for the diphenyl carbonate preparation process (DPC process).
摘要:
A method for fabricating a microelectronic device comprising: a support, an etched stack of thin layers comprising: at least one first block and at least one second block resting on the support, in which at least one drain region and at least one source region, respectively, are capable of being formed, several semiconductor bars connecting a first zone of the first block and another zone of the second block, and able to form a multi-branch transistor channel, or several transistor channels, the device also comprising: a gate surrounding said bars and located between said first block and said second block, the gate being in contact with a first and a second insulating spacer in contact with at least one sidewall of the first block and with at least one sidewall of the second block, respectively, and at least partially separated from the first block and the second block, via said insulating spacers.
摘要:
A method for monitoring wear of a blade pitch brake within a rotor blade pitch control system of a wind turbine is described. The rotor blade pitch control system includes a blade pitch actuator. The method includes engaging the blade pitch brake and measuring a blade pitch displacement while the blade pitch brake is engaged. The method further includes determining a brake wear level based on the measured blade pitch displacement while the blade pitch brake is engaged, and generating a brake wear level output signal corresponding to the brake wear level.
摘要:
Techniques for providing network services at an audio interface unit include determining, based on spoken sounds of a user of an apparatus received at a microphone of the apparatus, whether to present audio data received from a different apparatus. If it is determined to present the received audio data, then presentation of the received audio data at a speaker of the apparatus is initiated. In some embodiments, an apparatus includes a data communications bus; and logic encoded in one or more tangible media configured to performs the above steps. In some embodiments, the apparatus does not include a visual display and does not include a keypad of multiple buttons.