Optimized dispatching method of operating system

The invention discloses an optimized dispatching method of an operating system, which comprises the following steps: running an application program or software and dividing the application program or software into a plurality of execution units; distributing a plurality of running time slices to each execution unit by the operating system; detecting the occupancy rate of a CPU in real time and computing the occupancy rate increments of the CPU in various time ranges defined by the invention and rational function values which take the increments as independent variables; setting a threshold value; and by comparing the rational function values of the occupancy rate increments of the CPU in a time period with the threshold value, distributing follow-up running time slices to each running unit according to a certain regulation by the operating system. The invention adopts the CPU occupancy rate as a perceive parameter to more directly and quickly reflect the thermal failure degree of a CPU ...

Method for preparing 4'-hydroxy-2,4-methylenedioxy dihydrocharcone

The invention relates to a preparation method of lourerin A as 4'-hydroxy-2, 4-dimethoxy dihydrocharcone, belonging to the technical field of organic chemical synthesis. The invention dissolves 4-benzyloxy acetophenone as raw material to be reacted with 2, 4-dimethoxy benzaldehyde via aldol condensation reaction, while alkali and alcohol solution is used as solvent, uses Pd/C as catalyt, processes hydrogenation reduction, removes protective group, separates crude product, and purifies to obtain target product as lourerin A. The invention provides a method for chemically synthesizing lourerin A whose purity can reach 98% (HPLC), with simple and safe operation, controllable operation and high product purity, which is suitable for industrial production.

Method for preparing 4'-hydroxy-2,6-methylenedioxy dihydrocharcone

The invention relates to a preparation method of flag leaf lourerin A as 4'-hydroxy-2, 6-dimethoxy dihydrocharcone, belonging to the technical field of organic chemical synthesis. The invention dissolves 4-benzyloxy acetophenone and 2, 6-dimethoxy benzaldehyde in the alcohol solution of alkali to process aldol condensation reaction, processes hydrogenation reduction on the intermediate 4'-benzyloxy-2, 6-dimethoxy benzaldehyde in the presence of Pd/C and removes protective group, and purifies to obtain target product as flag leaf lourerin A. The invention provides a method for chemically synthesizing flag leaf lourerin A, with simple and safe operation, high product purity, stable quality and low cost, which is suitable for industrial production.

Method for analyzing content of trans-butene diacid mono-methyl fumarate and impurities thereof by high performance liquid chromatography

The invention discloses a method for analyzing the content of trans-butene diacid monomethyl fumarate and impurities thereof by high performance liquid chromatography (HPLC). The invention adopts the reversed-phase HPLC satisfying the following conditions: the chromatographic column is C18 with the particle size being 5 mum and the inside diameter (I.D.) being 250*4.6mm; the mobile-phase composition volume ratio between acetonitrile and phosphoric acid solution (0.08%) is equal to 40:60 (ml/ml); the flow rate is 0.5 ml/min; the column temperature is 30 DEG C; the detection wavelength is 210nm; the injection volume is 10 mul; and the method for determining the content of trans-butene diacid monomethyl fumarate and the impurities thereof is characterized in that the phosphoric acid with the volume ratio being 0.08% is added to the mobile phase, and the concentration of the injection sample to be determined is diluted for 50 times with the mobile phase. The invention can accurately determine ...

Method for screening dihydrochalcone compound

The invention relates to a method for screening a dihydrochalcone compound, which comprises the following steps: firstly combining B series of compounds of a plurality of benzaldehyde compounds into a mixture and leading the mixture to react with m types of A series of acetophenone compounds of a ketoaldehyde condensation reactant in sequence to generate corresponding m groups of dihydrochalcone mixtures; combining the m types of A series of compounds into a mixture and leading the mixture to react with B series of single compounds in sequence to generate a plurality of groups of dihydrochalcone mixtures. Respective strongest mixtures are selected from the A series of mixtures and the B series of mixtures to determine the strongest A series of acetophenone compound and the strongest B series of benzaldehyde compound; the strongest A series of acetophenone compound is reacted with a plurality of B series of compounds in sequence, and the strongest B series of benzaldehyde mixture is reacted ...

Method for preparing DL-tryptophan from remaining solution of split tryptophan

The invention discloses a method for preparing DL-tryptophan from a remaining solution of split tryptophan. The method comprises the following steps of: adjusting and recovering the tryptophan with ammonia water by taking the remaining solution of the split tryptophan as a raw material, carrying out racemization on the recovered tryptophan with an acid resin catalyst, a racemization catalyst and water at the normal pressure, and recrystallizing to obtain the target product, i.e. DL-tryptophan. The yield is larger than 95%, the purity reaches more than 98.5% (which is tested with HPLC (High-performance Liquid Chromatography)), racemization rate is larger than 98%, and use ratio of the raw material is larger than 95%. Compared with prior art, in the invention,the remaining solution of the split tryptophan is utilized and racemized to obtain the DL-tryptophan, the racemization rate is high and the operation is convenient. By virtue of the method, not only can recycling of the raw materials ...

Synthesis method of antioxidant 1076 using solid base catalyst

The invention relates to a synthesis method of antioxidant 1076 using solid base catalyst. The 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and the octadecanol are used as raw materials which are subjected to the interesterification reaction in the presence of a solid base catalyst to obtain the product of antioxidant 1076 with the purity more than or equal to 97.5% and the yield more than or equal to 85%. Compared with the prior art, the method provided by the invention utilizes the prepared solid base catalyst, thus the catalysis effect is improved, and the quality of obtained products is stable; in addition, the solid base catalyst is recyclable and environmental friendly, and the process operation is safe and convenient, therefore the method is suitable for the industrialized and mass production.

Method for preparing D-phenylalanine through dynamic kinetic resolution

The invention discloses a method for preparing D-phenylalanine through dynamic kinetic resolution. The method comprises the following steps of: reacting L-phenylalanine serving as raw materials with hydrochloric acid to generate L-phenylalanine hydrochloride; racemizing and resolving under the action of a solvent and a racemization catalyst by taking the L-phenylalanine hydrochloride as a substrate and dibenzoyl tartaric acid (L-DBTA) as a resolving agent to obtain D-phenylalanine.L-DBTA disalt; and finally performing triethylamine resolution to prepare the target product D-phenylalanine. Compared with the prior art, the method directly takes the L-phenylalanine as the resolving substrate, mild alcohol as the solvent and an aldehyde pyridine compound as the racemization catalyst, racemizes and resolves the L-phenylalanine into the D-phenylalanine.L-DBTA disalt, has a theoretical conversion rate of about 100 percent, greatly improves the resolution yield, reduces the operating cost, ensures ...

Method for preparing 4'-hydroxy-2,4-methylenedioxy dihydrocharcone

The invention relates to a preparation method of lourerin A as 4'-hydroxy-2, 4-dimethoxy dihydrocharcone, belonging to the technical field of organic chemical synthesis. The invention dissolves 4-benzyloxy acetophenone as raw material to be reacted with 2, 4-dimethoxy benzaldehyde via aldol condensation reaction, while alkali and alcohol solution is used as solvent, uses Pd/C as catalyt, processes hydrogenation reduction, removes protective group, separates crude product, and purifies to obtain target product as lourerin A. The invention provides a method for chemically synthesizing lourerin A whose purity can reach 98% (HPLC), with simple and safe operation, controllable operation and high product purity, which is suitable for industrial production.

Method for screening out active natural medicines by using immobilization model of alpha-glucosaccharase

This invention relates to a method of screening active natural medicines by immobilization model of alpha-glucosaccharase. It belongs to chemical craft domain of new drug screening, characters: immobilizing alpha-glucosaccharase, make screening model of its inhibitor, and validate model efficiency efficaciously of representative alpha-glucosaccharase inhibitor acarbose. We use this model to select Huzhang and Xuehe, first fix the alpha-glucosaccharase, enclose it into chromatographic column with pH=6.8 KxH3-xPO4 buffer solution at 4Deg.C. When selecting Huzhang and Xuehe, we add 4-nitrobenzene- alpha -galactopyranose, Huzhang and Xuehe, and then collect the buffer solution eluted, test its absorption in the Ultraviolet spectrophotometer, count the suppression rate by formulae, draw work curve of the corresponding suppression solution density, obtain half suppression solution density IC50 at the point of 50% suppression rate, as the thereunder of selection material activity.

Preparing process of Chinese medicine dragon's blood flavone extract

4'-hydroxy-4,6'-dimethoxy dihydrocharcone and method for synthesizing the same

Method for preparing 4'-hydroxy-2,4,6-trimethoxy dihydrocharcone

The invention relates to a method of the preparation of loureirin B i.e. 4' -hydrox-2, 6-trimethoxychalcone, pertaining to the technical field of the chemical synthesis of dihydrochalcone. The invention takes 4-benzyloxy acetophenone as raw material to conduct aldol condensation reaction with 2, 4, 6-trimethoxybenzaldehyde in alkaline alcohol solution to achieve intermediate 4'- benzyloxy-2, 4, 6- trimethoxychalcone; subsequently, the intermediate is added with hydrogen for reduction under the existence of catalyst Pd/C, and de-protecting group, and finally, the desired loureirin B is achieved. The invention provides a method for the chemical synthesis of loureirin B, the operation method is simple and safe, the achieved product has high purity and has activity as high as that of the loureirin B extracted from Longxuejie (Chinese medicine).

Method for preparing D-serine by kinetic resolution

The invention discloses a method for preparing D-serine by kinetic resolution. The method takes DL-serine as raw material and is implemented by esterifying DL-serine with methanol under catalysis of Amberlyst-15 ion exchange resin to obtain DL-serinemethylester, carrying out dynamic kinetic resolution on DL-serinemethylester and resolving agent L-DBTA under action of racemization catalyst to obtain dibasic DL-serinemethylester.L-DBTA, dissociating with hydrochloric acid, and hydrolyzing to obtain D-serine, the target product of the invention. Compared with the prior art, by using the racemization catalyst in the invention, the dynamic continuous conversion of dibasic L-serinemethylester.L-DBTA into dibasic DL-serinemethylester.L-DBTA can be realized with the theoretic conversion rate being approximate to 100%, thus greatly enhancing yield of resolution, reducing operation cost, stabilizing product quality and being suitable for industrialized production.

Preparation method of dimethyl fumarate

The invention discloses a method for preparing fumaric dimethyl ester (DMF). The method comprises the steps of taking maleic anhydride as raw material and subjecting the raw material and methanol to catalytic reaction in the presence of a solid-acid SO4/Al2O3 catalyst so as to obtain the fumaric dimethyl ester, namely a target product of the invention. The purity of the fumaric dimethyl ester obtained by the preparation method is up to over 98.5 percent, and the yield of the fumaric dimethyl ester is between 85 and 95 percent. Compared with the prior art, the method has the advantages that the method adopts the solid-acid SO4/Al2O3 catalyst, is safe and convenient in operation, improves environment, reduces corrosion on equipment, can cyclically recycle reaction solvent and the solid-acid catalyst, reduces the three wastes, ensures stable product quality, and is suitable for industrial production.

Coking wastewater pretreatment method

The invention discloses a coking wastewater pretreatment method. The method comprises the steps of adjusting water quality in an adjusting tank, reacting the wastewater and filler in a micro electrolysis reactor, settling the reaction product in a sedimentation tank and the like. Waste iron scrap, cooper scrap and zeolite are used as the filler; the pH of the inlet water is 2.0 to 12.0; the hydraulic retention time is 20 to 60 minutes; and B/C of the pretreated outlet water reaches over 0.5 by adopting air aeration. The method can effectively solve the problems of poor ammonia nitrogen treatment effect, hardening, channeling and the like during pre-treating the coking wastewater by using a micro electrolysis method, has the advantages of simple operation, low cost, economy and feasibility, is favorable for popularization and use, and can effectively improve and solve the pollution problem of the coking wastewater to the environment.

Method for biochemically treating coking wastewater

The invention discloses a method for biochemically treating coking wastewater. The method comprises the following steps of: pretreating coking wastewater; feeding pretreated coking wastewater into an anaerobic tank for anaerobic treatment; and feeding the treated wastewater into an aerobic three-phase fluidized bed for anaerobic treatment, wherein the pH of the anaerobic tank is between 6.0 and 7.5; the hydraulic retention time is between 8 and 30 hours; the pH of the aerobic three-phase fluidized bed is between 7.5 and 8.5; the hydraulic retention time is between 8 and 24 hours; the dissolved oxygen content is between 2 and 4mg/L; and effluent COD, ammonia nitrogen, volatile phenol and cyanide meet the steel industrial water pollutant effluent standard (GB13456-92) and the primary standard of the integrated wastewater effluent standard (GB 8978-1996). The method can effectively solve the problems of bad treatment effect, large amount of sludge, complicated process, high cost and the like ...

4'-hydroxy-4,6'-dimethoxy dihydrocharcone and method for synthesizing the same

The present invention discloses a 4'-hydroxy-4, 6'-dimethoxy dihydrochalcone and a synthesis method thereof. The present invention considers 4-benzyloxy-2-hydroxy hypnone as the raw material to be processed for the methylation reaction when the two phases of lye and organic solvent exist, and 4-benzyloxy-2-methoxy hypnoone is obtained. Then the 4-benzyloxy-2-methoxy hypnoone and 4-methoxy benzaldehyde are processed for the aldol condensation reaction in alkaline alcohol solution to obtain a intermediate product of 4'-benzyloxy-4, 6'-dimethoxy chalcone, then the intermediate is hydrogenated tobe deoxidized when catalyst Pd/C exists, and protective group is removed from the intermediate, and finally a target product of the present invention of the 4'-hydroxy-4, 6'-dimethoxy dihydrochalconeis obtained. The operation of the method of the present invention is safe, simple and convenient; the obtained product has the high purity, the good safety of animal acute toxicity test and the good activity ...

Preparation method of alpha-acetamido-phenylpropionitrile

The invention discloses a preparation method of alpha-acetamido-phenylpropionitrile, which comprises the following steps of: taking 2-acetamido-3-phenyl acrylonitrile as a raw material and ethanol as a reaction solvent and adding hydrogen selectively under the action of an Au/Al2O3 catalyst so as to obtain the target product of the alpha-acetamido-phenylpropionitrile. The purity of the product obtained by the method reaches more than 98.5%, and the yield is 85-95%. Compared with the prior art, the invention adopts the Au/Al2O3 as the catalyst, has good selectivity of a hydrogenation reaction, avoids the probability of generating a by-product by over-reduction, enhances the yield greatly, has simple postprocessing, safe, simple and convenient operation and stable product quality and is suitable for the industrialized production.