Abstract: A method for detecting abnormal direct current voltage measurement in a modular multilevel converter high voltage direct current transmission system is provided. In the method, a valve group voltage at a detection pole is obtained, voltages at voltage measurement points at the detection pole are collected, and comparison and determination are performed based on the actual arrangement of the voltage measurement points, and then whether an abnormal measurement occurs at each of the voltage measurement points is determined.

Abstract: A federated computing method, an electronic device and a storage medium. Metadata to be processed is obtained from each participant based on a task identifier (ID) to be executed. n data slices corresponding to each participant are obtained by dividing the metadata, where n is a positive integer greater than 1. n data sets are generated based on the n data slices corresponding to each participant. n data processing services corresponding to the task ID are called to process each data set using each of the data processing services. A federated computing result corresponding to the task ID is determined based on a processing result of each of the data processing services.

Abstract: Methods are provided for determining the residence age of petroleum fluids in subsurface reservoirs. The methods facilitate the determination of the geological timing of the emplacement of a petroleum fluid in a porous reservoir, as distinct from the timing of petroleum generation in, and expulsion from, a source rock.

Abstract: Methods are provided for determining the residence age of petroleum fluids in subsurface reservoirs. The methods facilitate the determination of the geological timing of the emplacement of a petroleum fluid in a porous reservoir, as distinct from the timing of petroleum generation in, and expulsion from, a source rock.

Abstract: The present invention discloses a preparation method of 2,3-dimethyl phenyl-1-trityl-imidazole-4-ketone. In accordance with this method, imidazole-4-ethyl formate is used as a raw material; ethyl formate is used for amino protection, 1-trityl-1H-imidazole-4-formic acid is obtained after basic hydrolysis; 1-trityl-1H-imidazole-4-formic acid and N,O-dimethylhydroxylamine hydrochloride are subjected to condensation so as to obtain N-methoxyl-N-methyl-1-trityl-1H-imidazole-4-formamide; and N-methoxyl-N-methyl-1-trityl-1H-imidazole-4-formamide and a Grignard reagent prepared by the reaction of 2,3-dimethylbromobenzene with magnesium are subjected to a Grignard reaction, and then the target product 2,3-dimethyl phenyl-1-trityl-1H-imidazole-4-ketone is obtained. Compared with the reported preparation methods, the preparation method is more convenient to operate and is beneficial for industrial production.

Abstract: The present invention discloses a preparation method of 2,3-dimethyl phenyl-1-trityl-imidazole-4-ketone. In accordance with this method, imidazole-4-ethyl formate is used as a raw material; ethyl formate is used for amino protection, 1-trityl-1H-imidazole-4-formic acid is obtained after basic hydrolysis; 1-trityl-1H-imidazole-4-formic acid and N,O-dimethylhydroxylamine hydrochloride are subjected to condensation so as to obtain N-methoxyl-N-methyl-1-trityl-1H-imidazole-4-formamide; and N-methoxyl-N-methyl-1-trityl-1H-imidazole-4-formamide and a Grignard reagent prepared by the reaction of 2,3-dimethylbromobenzene with magnesium are subjected to a Grignard reaction, and then the target product 2,3-dimethyl phenyl-1-trityl-1H-imidazole-4-ketone is obtained. Compared with the reported preparation methods, the preparation method is more convenient to operate and is beneficial for industrial production.

Abstract: Techniques for preconditioning an oilfield reservoir including heavy oil and/or bitumen prior to production of a petroleum product are described. A preconditioning agent can be injected into a mobile water film included in the oilfield reservoir. The preconditioning agent preconditions the reservoir prior to production of the petroleum product.

Abstract: Techniques for preconditioning an oilfield reservoir including heavy oil and/or bitumen prior to production of a petroleum product are described. A preconditioning agent can be injected into a mobile water film included in the oilfield reservoir. The preconditioning agent preconditions the reservoir prior to production of the petroleum product.