33results about How to "Low application value" patented technology

The invention relates to novel chloroethyl nitrosourea with anticancer activity and a synthesizing method thereof. The chloroethyl nitrosourea is a compound with a structure of the general formula (I), wherein n is an integer of 2 to 6. The chloroethyl nitrosourea can be used for treating gliomatosis cerebri, colon cancer and leukemia; compared with the existing nitrosourea-type anticancer medicine, the drug resistance is lower, the chemical therapy effect is better, the preparation method is simple in operation, the reaction yield is high, the toxicity is small, the cost is low, the method is suitable for the industrialized production, the development prospect is wide, and the application value is good.

The invention belongs to the field of new emergency security materials, particularly relates to a water-based aerogel efficient fire extinguishing agent, and further discloses a preparation method thereof, According to the water-based aerogel efficient fire extinguishing agent, the inorganic aerogel powder, the template agent, the phosphorus-containing flame retardant, the nitrogen-containing flame retardant and the hydrophilic colloid stabilizer are used as raw materials, wherein the efficiency of the fire extinguishing agent is greatly improved by utilizing the ultralow heat conductivity coefficient and ultrahigh adsorption capacity of the inorganic nano porous aerogel; meanwhile, the phosphorus-containing flame retardant and the nitrogen-containing flame retardant are combined to serveas related functional components of the fire extinguishing agent, and the colloid stabilizer and the ion buffer agent are added into the water-based flame retardant, so that the uniformity and the expiration date of the flame retardant are increased, and the fire extinguishing agent has an efficient fire extinguishing function, a good fireproof function and a good flame retardant function; in addition, the fire extinguishing agent also has longer quality-guaranteeing storage life, and the fire extinguishing variety, efficiency and application range are effectively expanded.

The invention discloses an NO2 gas sensitive element based on an rGO-SnO2 nanometer composite material and a preparation method thereof, and belongs to the technical field of graphene-metallic oxide composite material gas sensitive elements. The gas sensitive element mainly consists of an electrode component and the rGO-SnO2 nanometer composite material uniformly coated on the electrode component, the microstructure of the rGO-SnO2 nanometer composite material comprises SnO2 nanospheres uniformly grown on a reduction-oxidation graphene sheet layer, the diameters of the SnO2 nanospheres are 40 to 70 nm, and the material is of a square cassiterite phase structure. The rGO-SnO2 nanometer composite material with large specific surface area, low specific resistance and high dispersibility is prepared by using a one-step hydrothermal method, and then the NO2 gas sensitive element is prepared by taking the rGO-SnO2 nanometer composite material as a gas sensitive coating. The gas sensitive element effectively solves the problems that traditional NO2 gas sensitive elements are relatively high in operating temperature and graphene gas sensitive elements are relatively low in sensitivity and relatively long in recovery time, and has preferable application values and development prospects.

The invention belongs to the technical field of microwave testing, and discloses a clamp de-embedding method and system, a storage medium, a computer program and application, and the method comprisesthe steps: employing a clamp to clamp two different transmission lines, and respectively measuring S parameters [St], i.e. [St1] and [St2], of the whole system; calculating S parameters [St01] and [St02] of the two different sections of transmission lines clamped by the clamp according to a formula; setting an appropriate initial value [S], and approximating the S parameter [S] of the clamp. The comparison between the clamp simulation data and the calculation data finds that the clamp S parameter data at the two ends of the tested piece can be accurately and effectively extracted by adopting the clamp de-embedding method of the double transmission lines, and a good foundation is laid for subsequent semiconductor parameter testing. Compared with a traditional calibration method, the methodhas the advantages of being easy to implement and machine and low in requirement for the machining precision of standard parts, and has good application value.

The invention provides a technical scheme of a treatment method of wastewater containing amino compounds by copolymerization and extraction. At normal temperature and normal pressure, the scheme comprises the following steps of: (1) placing the organic wastewater containing the amino compounds into a copolymerization and extraction reaction tower, regulating the pH value of the wastewater to 5.7-6.5; (2) adding an extracting agent, wherein the volume ratio of the extracting agent to the wastewater is 1: 100-1: 1000, and the extracting agent is of oleic acid or methyl oleate; (3) performing aeration reaction on the wastewater in the reaction tower, wherein the time of the aeration reaction is 2-6 hours; (4) standing for 5-30 minutes after the aeration reaction; (5) performing liquid-liquid separation on the wastewater in the reaction tower after standing, sucking out an extraction phase in the upper layer after reaction, placing into a decompression distillation reaction device, performing decompression distillation and recovering the extracting agent, so that low-concentration organic wastewater generated after copolymerization and extraction is left in the reaction tower; and (6) further performing treatment on the low-concentration organic wastewater through a biochemical treatment method and discharging the wastewater after the wastewater achieves the standard.

The invention provides a manufacturing method of a composite sweetening agent. The front taste of the composite sweetening agent is soft, the after taste is pure, no impurity taste is observed, and the mouthfeel is close to that of saccharose. According to the manufacturing method, trehalose, arabinose (ingredient A), a dihydrochalcone glucoside, L-glycine and a derivative of L-glycine (ingredientB), and a other natural sweet component (ingredient C) are uniformly mixed based on a certain formula, or are dissolved in water based on a formula ratio, and then are subjected to condensation crystallization or spray drying so as to obtain a finished product. The dihydrochalcone glucoside natural product is capable of enhancing sweet taste and inhibiting bitter taste, and L-glycine and the derivative of L-glycine are capable of removing impurity taste and covering adverse after taste, so that a defect that common sweetening agents possess adverse mouthfeel is avoided, the sweetness of the composite sweetening agent is more close to that of saccharose, the mouthfeel is excellent, calorie is low, cost is low, and the composite sweetening agent can be widely used in processing of food andbeverage.

The invention discloses a special catalyst for preparing 3, 4-dichlorobenzonitrile. The carrier of the special catalyst is a silica gel-carbon nitride composite carrier formed by doping carbon nitridewith silica gel, and the composition of a loaded active component is shown as VSbbPcDdEeGgOx, wherein D is boron, lanthanum, cerium, samarium, europium, scandium, chromium, molybdenum, bismuth or tungsten, E is titanium, zirconium, manganese, iron, cobalt, nickel, copper, zinc or tin, and G is lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium or barium. The invention also discloses a preparation method and application of the catalyst. In the composite carrier of the special catalyst prepared by the method, carbon nitride is used as Lewis base to perform Lewis acid-base reaction with an active component used as Lewis acid so that the action of the active component and the carrier is enhanced, the loss of the active component is reduced, the active component is dispersed more uniformly, and the strength and wear resistance of the catalyst are improved; the service life is prolonged; and the oxidation-reduction capability of the catalyst and the coordination capability with reactants can be adjusted by utilizing the carbon nitride so that the activity and the selectivity of the catalyst are improved.

The invention belongs to the technical field of artemisinin derivatives, and particularly relates to an artemisinin-chlorambucil ester compound and a preparation method thereof. In order to solve the problems that the tumor effect of artemisinin needs to be improved, the toxic and side effects of chlorambucil are large and the like, artemisinin-chlorambucil ester with a novel structure is designed and synthesized according to a pharmacophore splicing principle, and the structure of the artemisinin-chlorambucil ester compound is represented and determined by 1H NMR, 13C NMR and HRMS-ESI. The compound has good anti-tumor activity, and the toxic and side effects of chlorambucil are reduced. The preparation method is simple, the obtained derivative is high in anti-tumor activity and low in toxic and side effects, a novel medicine is provided for tumor resistance, and the derivative has good application value.

The invention relates to a preparation method of a clay mud inhibitor, as well as a product and application thereof. The preparation method comprises the following steps of (1) heating maleated rosin,premixing the maleated rosin and polyethylene glycol, and carrying out esterification reaction to obtain an intermediate product; (2) adding anhydrous sodium carbonate into the intermediate product obtained in the step (1), continuously reacting, and obtaining the clay mud inhibitor. Since the long and widespread problem that a concrete aggregate contains mud so as to influence the concrete quality exists, the invention provides a new solution, the clay mud inhibitor obtained through the preparation method provided by the invention is a modified abietic acid polycarboxylic acid mud inhibitor,and the clay mud inhibitor is regulated to have a specific molecular weight and a structure through the preparation method, so that the sensitivity of a low polycarboxylic acid water reducing agent on a clay is effectively reduced. When the mud content of the aggregate is higher, the mud inhibitor can inhibit the aggregate from adsorbing the water reducing agent, so that the adverse effects of big additive dosage fluctuation, reduced concrete strength, instable quality, difficulty in construction and the like caused by the reason that the aggregate contains the mud can be effectively overcome, the construction quality safety is further improved, and the clay mud inhibitor has a larger application value.

The invention discloses a special catalyst for preparing 2, 6-dichlorobenzonitrile by an ammonia oxidation method. The special catalyst is a multi-component inorganic composite oxide loaded by a silica gel-carbon nitride composite carrier, and the composition of the active component of the catalyst is shown as VMobBcCodDeOx, wherein D is lithium, sodium, potassium, rubidium, cesium, magnesium, calcium or barium. The invention also discloses a preparation method and application of the catalyst. Organic matters containing nitrogen and carbon and silica sol are respectively added as precursors ofcarbon nitride and silica gel for mixed calcination to form the silica gel-carbon nitride composite carrier. compared with a common silica gel carrier, the silica gel-carbon nitride composite carrierhas the advantages that the effects of the inorganic oxide and the carrier are enhanced, the strength and the wear resistance of the catalyst are improved, the inorganic oxide is dispersed more uniformly, the loss of catalyst components is reduced, and the service life of the catalyst is prolonged; meanwhile, the carbon nitride can also adjust the acid-base property, oxidation-reduction capability and coordination capability with reactants of the catalyst so that the activity and the selectivity of the catalyst are improved. The catalyst is simple in preparation method and good in thermal stability and mechanical strength.

The invention belongs to the technical field of circuit design, and discloses a low-leakage current gating switch circuit for multi-path resistance high-precision measurement, which comprises diodes D1-D7, a triode Q3, MOS (Metal Oxide Semiconductor) transistors Q1, Q4, Q5 and Q6, and operational amplifiers U1 and U2, a standard current input end is grounded after passing through a diode D1, an MOS tube Q1, a source electrode of the MOS tube Q1, a diode D3 and a resistor R4 to be measured, the diode D3 is further connected with an ADC sampling end through MOS tubes Q5, Q4 and Q6, a positive end of an operational amplifier U2 is connected with the standard current input end, a negative end of the operational amplifier U2 is connected with an output end, and the negative end of the operational amplifier U2 is further connected with the MOS tube Q1 through a diode D7 and a diode D2. The positive end of the operational amplifier U1 is connected with the ADC sampling end, the negative end of the operational amplifier U1 is connected with the output end, the output end of the operational amplifier U1 is connected with the diode D2 through the diode D6, and the output end of the operational amplifier U1 is further connected with the source electrode of the MOS tube Q6 through the diode D4. According to the invention, the overall leakage current of the circuit can be reduced to picoampere level, and the measurement precision is greatly improved.