13results about How to "Cheap method" patented technology

The invention discloses a method for predicting physical and mechanical parameters of a rock mass based on TSP advanced geological forecast, and belongs to the technical field of geotechnical engineering and advanced prediction.The method comprises the steps that based on the advanced forecast technology of the wave velocity of the rock mass in front of a tunnel face through the TSP method, the visual wave velocity obtained through the TSP method is corrected according to the wave velocity value of the rock mass measured through rock mass acoustic wave testing, and the wave velocity value of the rock mass in front of the tunnel face is obtained; the absolute wave velocity value of the rock mass of the unexcavated section of the tunnel is obtained; meanwhile, the strength parameter of the rock is actually measured through a rock point load test, and the strength parameter of the rock mass in front of the tunnel face is predicted according to the rock strength parameter and the rock mass wave velocity. The TSP forecasting function is fully excavated by using a theoretical formula and an empirical formula, and the physical and mechanical parameters of the rock mass in front of the tunnel face within the TSP testing range are accurately predicted. The method provided by the invention has the advantages of simplicity, convenience, rapidness, economy, high accuracy and the like, endows a new function for the TSP detection method, and can provide an effective means for predicting the physical and mechanical parameters of the tunnel rock mass.

The present invention provides a chemical synthesis method of EPS-G7, wherein β-cyclodextrin A is acetylated to obtain β-acetylcyclodextrin B, B is ring-opened in a mixed solution of acetic anhydride / concentrated sulfuric acid to obtain a chain acetylated heptose C, p-nitrophenol is condensed with intermediate C using boron trifluoride acetonitrile to obtain a key intermediate p-nitrophenyl (G1)-O-acetyl-D-maltoseptaglycoside D with α as the dominant configuration, D is removed from the acetyl group under the action of sodium methoxide to obtain pNP-G7 (p-nitrophenyl (G1)-D-maltoseptaglycoside), pNP-G7 is in the presence of p-toluenesulfonic acid and dimethoxyethane, and acetal protection is formed between the hydroxyl groups on C4 and C6 of the terminal monosaccharide to obtain EPS-G7. The reaction raw materials used in the method of the present invention are cheap and readily available, and the chemical synthesis of α-amylase detection reagent EPS-G7 is realized, which is a simple, economical and efficient synthesis method.

The invention discloses a method for judging and optimizing the stability of an extended mining roof-pillar supporting structure. According to the invention, discretization processing is carried out according to the condition of a goaf group supporting structure, and the displacement, tensile stress value and safety coefficient of a goaf group top plate and the displacement, load value and safety coefficient of an ore pillar are obtained through a superposition principle based on the displacement continuity and load transmission conditions of the top plate and the ore pillar; according to the method, the stability of the roof-pillar supporting structure of the goaf group is judged, then the parameters of the extension mining structure are quantitatively optimized, instability of the upper goaf group caused by extension mining is prevented, and the roof-pillar supporting structure stability prevention and control and safe, efficient and intelligent mining of resources of the goaf group in open-stope extension mining are achieved. The method provided by the invention is also suitable for mining design and goaf intelligent safety prevention and control, and has wide universality.

The present invention relates to a temporary support frame for installing an assembled lattice steel structure and a method of using the frame, including a base section, a standard section, an adjustment section inner section, an adjustment section outer section, an adjustment top support, and a jack for unloading; the base section includes a base section column limb, a base section tie bar, and a base section cross beam; the standard section includes a standard section column limb, a standard section tie bar, and a standard section cross beam; the adjustment section inner section includes an adjustment section inner section column limb, an adjustment section inner section tie bar, and an adjustment section inner section cross beam. Through the present invention, the deficiencies of the prior art and devices are overcome, construction space is saved, the erection period is short, and the reuse rate is high; the lattice-type assembly section is light in weight, high in bearing capacity, and convenient to hoist; each assembly section can be flexibly assembled according to actual needs, and is easy to install; through multiple height adjustment devices, the installation elevation of the steel structure is ensured, and the installation of complex steel structures with variable elevations can be met, and the unloading operation after the steel structure is installed is convenient.

This invention discloses a method for preparing and applying a sodium borohydride-modified self-supporting anode for AEM water electrolyzers. Firstly, an amorphous ternary metal hydroxyl oxide precursor is grown in situ on a nickel substrate via room temperature liquid phase deposition. The process involves the presence of Co in solution. 2+ Fe 3+ Ni ions are introduced through slight corrosion of the nickel foam matrix. 2+ The ions, the three, and the OH- produced by hydrolysis ⁻ Co-deposition occurs under the influence of dissolved oxygen, leading to the self-assembly of amorphous nanosheet structures on the substrate surface. Subsequently, a mild chemical reduction treatment with sodium borohydride solution is used to obtain a structurally stable and high-performance self-supporting electrode. The method described in this embodiment is mild, simple, low-cost, and has good versatility.

The utility model relates to three screw rod pump technical field, concretely relates to three screw rod pump for conveying high temperature lubricating grease, including double -deck heat preservation pump body, shaft seal, screw rod to be used for double -deck heat preservation pump body's double -deck welding type heat preservation mechanism, be used for shaft seal's mechanical seal flushing mechanism, be used for screw rod's axial thrust mechanism. The three screw rod pump for conveying high temperature lubricating grease, through having the double -deck welding type with heat preservation function's double -deck heat preservation pump body design, make it in the conveying high temperature lubricating grease pumping process, realize high pressure material in low pressure chamber when in overpressure is introduced, through having the shaft seal design with mechanical seal flushing system, reliably realized the shaft seal problem of high temperature lubricating grease, through the combination use under double -deck welding type heat preservation mechanism, mechanical seal flushing mechanism, axial thrust mechanism, can completely realize the safe long -life pumping of high temperature lubricating grease, pulsation is low, no shear, and this method is simple, economic, continuous, is suitable for the conveying process of high temperature lubricating grease.

The invention relates to the technical field of food safety detection, discloses a method for rapidly determining 17 novel veterinary drug compounds in animal-derived food by combining solid-phase extraction with HPLC-MS / MS (High Performance Liquid Chromatography-Mass Spectrometry / Mass Spectrometry), and relates to an HPLC-MS / MS method for determining 17 novel veterinary drug residues such as yohimbine, medetomidate and tripinramine in chicken, beef, fish and shrimp. Trade barriers and economic losses caused by drug residues can be avoided; comprising the following steps: 1) preparing standard stock solutions with different concentrations by using standard substances of 17 novel veterinary drug compounds, and mixing standard working stock solutions; a series of working standard solutions are prepared by using the standard stock solution and are used for HPLC-MS / MS detection; 2) adding the mixed standard working stock solution into extracted and purified blank sample residues to prepare a series of matrix matching mixed standard solutions with different concentrations, filtering the mixed standard solutions, and loading the mixed standard solutions on a machine for detection, and 3) homogenizing the samples of cattle, chicken, fish and prawns, carrying out subsequent treatment, and carrying out HPLC-MS / MS online analysis on the obtained samples.

The invention provides a metabolic marker composition for distinguishing health from breast cancer. Based on metabonomics data of blood plasma, a blood plasma metabolism marker combination for breast cancer diagnosis is screened, and a breast cancer diagnosis model with relatively high sensitivity and specificity is constructed in combination with a machine learning algorithm. The method has high sensitivity and specificity, samples are convenient to obtain, non-invasive performance is achieved, accurate screening of the breast cancer can be achieved, important help is provided for prevention of the breast cancer and reduction of the morbidity, and the method is suitable for large-scale population screening and long-term tracking in areas with shortage of medical resources.

The present invention discloses an artificial pneumatic cough assist device, comprising a pneumatic switch valve and an air bag, wherein the pneumatic switch valve is a normally open valve body, the pneumatic switch valve is arranged along the ventilation trachea and is located near the patient's mouth, and the air bag is located outside the body and is connected to the pneumatic switch valve through a pipeline. The device uses a pneumatic switch valve in combination with a simple air bag, and the pneumatic switch valve enables the patient to hold his breath, and the air bag held in the hand can be used to autonomously control the breath holding time. When the patient feels the need to cough, the patient can take a deep breath on his own, and hold the air bag tightly before exhaling, so that the pneumatic switch valve is closed, and then released to form a higher air flow rate, thereby achieving the purpose of clearing sputum in the small airways, promoting the control of lung infection and patient recovery, and reducing the risk of nosocomial infection. The overall structure of the device is simple, the cost is low, and it is easy to operate.

The invention relates to the field of synthesis of bulk drug intermediates, and discloses a synthesis method of a dotenorad intermediate, the reaction route is as follows: # imgabs0 #, the invention provides a new route for preparing the dotenorad intermediate, the reaction route is high in reaction yield, and the used raw materials are simple; post-treatment of the reaction is simple, and column chromatography is not needed; and by adopting the route of the invention, the required raw materials are easy to obtain, and compared with the prior art, the method disclosed by the invention is more economical and more suitable for industrial production.

The invention relates to a method for determining the contents of 15 beta-receptor stimulants, 3 amido alcohols and 11 nitroimidazole antibiotics in agricultural products, and belongs to the technical field of detection. The invention relates to a method for determining the contents of 15 beta-receptor stimulants, 3 amido alcohols and 11 nitroimidazole antibiotics in agricultural products. The agricultural products are spinach, asparagus lettuce or peach. The 15 kinds of beta-receptor stimulant antibiotics are cimaterol, cibuterol, ritodrine, clenbuterol, hydroxymethyl clenbuterol, clenproterol, ractopamine, clorprenaline, clenbuterol, tubuterol, brombuterol, bambuterol, mabuterol, clenbupant and mappenterol, and the 15 kinds of beta-receptor stimulant antibiotics are selected from the group consisting of propamine, propamine, propamine, propamine, propamine, propamine, propamine, propamine, propamine, propamine, propamine, propamine, propamine and propamine. The three kinds of amide alcohol antibiotics are chloramphenicol, thiamphenicol and fluorine thiamphenicol. The method has the characteristics of simplicity, convenience, high efficiency, accuracy, sensitivity, economy and the like.

The invention belongs to the field of preparation of organic compounds, and relates to a preparation method of olefin and fluoroolefin. Acrylic acid or fluoroacrylic acid reacts with dihydroquinazolinone, oxygen is used as an oxidizing agent, chlorobenzene is used as a solvent, under the catalysis of ferrous acetate, reaction is carried out according to the following reaction formula, and the olefin and fluoroolefin compounds are obtained. The method is low in cost, high in product selectivity and simple to operate, and clean oxygen is used as an oxidizing agent. Synthetic compound # imgabs0 with high application value in organic chemistry, pharmaceutical chemistry and material science

A process for producing hydrogen and / or bromine by electrolyzing hydrogen bromide in the electrolysis of hydrogen bromide using a fluoropolymer membrane having a glass transition temperature Tg > = 110 DEG C, wherein the hydrogen bromide is derived from the bromination of hydrocarbons.