145results about How to "Less severe" patented technology

The invention relates to a cyclic RNA molecular marker for diagnosis of gastric cancer, the cyclic RNA molecular marker is characterized in that the cyclic RNA is hsa-circ-0001017, the invention also provides a method for detection of the cyclic RNA molecular marker in plasma, and the method comprises the following steps: (1) collecting blood, and extracting total RNA in the plasma; (2) performing reverse transcription of the total RNA into cDNA; (3) performing droplet digital PCR detection of a cDNA solution of the step (2) by use of specific amplification back-to-back primers and amplification upstream and downstream primers of housekeeping gene GAPDH, after the completion of the reaction, detecting fluorescence signal values of all droplets, setting a threshold, and determining whether the droplets include the cyclic RNA or the housekeeping gene GAPDH, wherein the droplets higher than the threshold are positive droplets, and the droplets below the threshold are negative droplets; and (4) counting the number of the positive droplets, and calculating the copy number of the hsa-circ-0001017 and the housekeeping gene GAPDH in the plasma for quantitative detection of the hsa-circ-0001017 and the housekeeping gene GAPDH in the plasma. Compared with the prior art, the advantages are that the hsa-circ-0001017 can be specifically expressed in plasma in patients with gastric cancer, and can be used as a new molecular marker for diagnosis of the gastric cancer.

In a method and x-ray apparatus for exposure of a patient who can be placed at a variable distance relative to an x-ray source, the dose rate emitted by the x-ray source is reduced given reduction of the distance and/or increased given increase of the distance.

The invention belongs to the technical field of phenolic resin synthesis, and discloses a method for synthesizing phenolic resins by using paraformaldehyde. The method comprises the following steps: opening a reaction kettle stirring mechanism, pumping preheated phenol into a reaction kettle in a reduced pressure state, then pumping recycled phenol containing wastewater into the reaction kettle and carrying out vacuum removal on the reaction kettle, and putting paraformaldehyde into the reaction kettle to uniformly heat at normal pressure so as to heat the obtained mixture to be boiled; after the boiling reaction is completed, cooling the obtained mixture, and adding an oxalic acid solution into the reaction kettle; after the obtained mixture is heated to be boiled and the pressure-reduced dehydration temperature rises to 150 DEG C, carrying out slow vacuum enrichment and then emptying on the obtained product so as to obtain phenolic resins, wherein the proportion of macromolecular weights of the phenolic resins is less than 6%, and the proportion of middle molecular weights of the phenolic resins is more than 80%. The phenolic resins prepared by using the method disclosed by the invention have high fluidity, and have a higher bonding strength when being taken as a binder under the condition that the resin adding amount is less.

The invention belongs to the field of medical conveying appliances, and particularly relates to an automatically leveled type multifunctional rescue stretcher. In order to cope with the characteristics of complex locality and various disastrous conditions during the field rescue, the automatically leveled type multifunctional rescue stretcher which mainly comprises a left lifting rod, a right lifting rod both located at the top part, four suspension rods and a stretcher bed located at the bottom is provided. Four rotation pairs composed of the lifting rods, the suspension rods and the stretcher bed encircle to form two isosceles triangle hanger frames; the stretcher bed is automatically leveled when persons climb slope or get down slope by utilizing moment of force generated by the gravities of the ill and wounded persons and the stretcher bed; and the damping stabilization function of the stretcher bed is realized by utilizing a friction force between stabilizing belts and the lifting rods. The lifting rods, the stabilizing belts, the suspension rods and the stretcher bed are connected by pins; and a rescuer can detach the stretcher into two simple stretchers based on the practical need so as to be used for conveying a common ill and wounded person and an ill and wounded person with fracture respectively. As the relatively angles of the stretcher bed and the lifting rods can be locked, the automatically leveled type multifunctional rescue stretcher after being locked can serve as a simple tent, a simple operating table and a double-layer stretcher.

The invention provides a single-compartment dual-thrust solid rocket engine and a rocket. The engine comprises a combustion chamber housing, a heat insulating layer attached to the inner surface of the combustion chamber housing, a propellant grain positioned in the combustion chamber housing, an igniter arranged at one end of the combustion chamber housing and a spray tube assembly arranged at the other end of the combustion chamber housing, wherein the propellant grain is provided with an inner hole which penetrates through the two ends of the propellant grain; the position, at one end closeto the igniter, of the inner hole, of the propellant grain is uniformly provided with a front wing slot which extends in a radial direction, and the position, at one end close to the spray tube assembly, of the inner hole, of the propellant grain is provided with a tail wing slot which extends in the radial direction; a ratio of wing slot depth of the front wing slot and the tail wing slot to thebiggest thickness of the propellant grain is greater than or equal to 0.81; and the slope range of the rear wing axial slope of the grain ranges from 160 degrees to 170 degrees. The single-compartment dual-thrust solid rocket engine is great in thrust change range, is stable in grain structure, is small in grain combustion surface change speed while an engine thrust mode is converted, can effectively reduce pressure intensity change speed of the combustion chamber, and enables thrust change speed to be gentle.

The invention relates to a method of preparing fluorine-containing olefin, and belongs to the technical field of organofluorine chemistry. The method comprises the following steps: firstly adding non-alcohol organic solvents, water and a metal dechlorinating agent with grain size of 40-150 microns into a container for stirring and mixing, and then rising the container temperature to 45 DEG C-65 DEG C; then, adding the chlorine-fluorine alkane material and keeping the temperature at 50 DEG C-80 DEG C; finally, rectifying to obtain the fluorine-containing olefin product. The method disclosed by the invention ensures that the dechloridation reaction can be kept at a certain reaction speed from beginning to end, has the advantages of being safer and more efficient, and is suitable for industrial production.

A hybrid energy storage system power distribution method based on states of charge includes the following steps that an energy storing device which is long in cycle life and capable of achieving large-current deep charge and discharge is set to be a first energy storing device D1, an energy storing device which is short in cycle life and the cycle life of the energy storing device is affected by large-current deep charge and discharge is set to be a second energy storing device D2, the second energy storing device D2 provides compensation power for the first energy storing device D1 according to the states of charge of the first energy storing device D1 to enable the states of charge to be in a reasonable level. According to the hybrid energy storage system power distribution method, capacity of the first energy storing device D1 is utilized to convert seriously-changing power fluctuation into stably-changing fluctuation of the states of charge, therefore, the intensity of power instruction fluctuation of the second energy storing device D2 can be reduced, and the service life of the second energy storing device D2 can be prolonged.

The invention relates to a production method of di(tert-butylperoxy)ketal, and mainly solves the problems of low product content, low yield, deep color and low production safety caused by violent side reaction in the previous technique. In the invention, R1 selected from cyclohexanone, 3,3,5-trimethylcyclohexanone or butyl levulinate and R2 tert-butyl hydroperoxide, which are used as raw materials, react in the presence of solvent at -20-40 DEG C under normal pressure for 0.5-10 hours to obtain the corresponding product 1,1-di(tert-butylperoxy)cyclohexane, 1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexanone or 4,4,-di(tert-butylperoxy)-n-butyl valerate, wherein the mol ratio of R2 to R1 is (2-10):1, the weight ratio of solvent to R1 is (0.01-0.50):1, and the amount of the solvent accounts for 20-80% of the total weight of the reactants R1 and R2; and the catalyst is selected from at least one of sulfuric acid, phosphoric acid, hydrochloric acid, perchloric acid, p-methylbenzenesulfonic acid, nitric acid or acetic acid. The technical scheme provided by the invention solves the problems in the previous technique, and can be used for industrial production of di(tert-butylperoxy)ketal.

The invention relates to a preparation method of a cadmium telluride or cadmium zinc telluride polycrystal material. The preparation method is characterized by comprising the following preparation process flows of: 1) cleaning and drying a large quartz crucible, a small crucible capable of being loaded into the large quartz crucible and a quartz plug; wherein a hole is formed in the bottom of thesmall crucible; 2) putting the large quartz crucible into a carbon plating furnace, and plating a layer of carbon film on the inner surface of the large quartz crucible; and 3) weighing elemental tellurium and elemental cadmium according to the ratio of cadmium telluride to be synthesized, or weighing elemental tellurium, elemental cadmium and elemental zinc according to the ratio of cadmium zinctelluride to be synthesized. By the preparation method, tellurium and cadmium can slowly react, the instantaneous reaction amount is reduced, and the risk of leakage caused by quartz tube cracking isreduced.

The invention discloses a preparation method of earthworm bioactive fulvic acid, and relates to a preparation method of fulvic acid. The invention aims to solve the problems in the process of converting livestock manure and crop straws into fulvic acid through a biochemical method and extracting the fulvic acid. The existing biochemical treatment needs to meet the temperature conditions, and the obtained fulvic acid has low purity, poor stability and short shelf life. According to the method, a mixture of livestock manure and straw is processed by 5 earthworm species in cooperation with microbial biological fermentation to produce an earthworm bait, and the earthworm bait is fed with high-efficiency earthworm varieties bred through independent hybridization to obtain earthworm manure withspecific components, and then the earthworm manure is extracted to finally obtain the earthworm bioactive fulvic acid. The method is applied to the field of preparation of fulvic acid.

The invention provides a high-strength sealant for an electronic product and a preparation method of the high-strength sealant. The high-strength sealant is prepared from the following components: waste rubber, epoxy resin, acrylic acids, monolauryl phosphate, dioctyl phthalate, polyether polyol, nano calcium carbonate, titanium dioxide, epoxidized soybean oil, modified lignin, isocyanate, a silane coupling agent, an amine catalyst and an antioxidant. The sealant prepared according to the preparation method provided by the invention has good pressure flow viscosity, Shore hardness, elongationat break and tensile strength, is high in pressure tightness, firm in adhesion, long in service life, excellent in performance and wide in application range; the preparation method is simple, and theraw material cost is relatively low; therefore, the high-strength sealant is suitable for industrial large-scale production.

The invention discloses a medium and low temperature energetic heat source for heating a cigarette and a preparation method of the medium and low temperature energetic heat source. The heat source comprises the components of 17%-32% of phenolic resin, 60%-63% of strontium nitrate and 5%-23% of assistant by weight in the formula, and the particle size is 0.1 mm to 0.2 mm. The heat source is ignited without external oxygen supply, the produced medium and low temperature is used for pyrolysis of a tobacco shred, and the contents of toxic and hazardous gases produced in the high temperature combustion of the tobacco shred are effectively reduced. The heat source, when applied to heating the tobacco, effectively inhibits the release of toxic and hazardous gases produced from certain ingredients in the tobacco in the high temperature combustion without affecting the smoking taste as much as possible, and is of popularization significance for reducing the harm of smoking.

The invention relates to the technical field of building structure engineering, in particular to a longitudinal joint impaction device and a longitudinal joint impaction resetting method.The longitudinal joint impaction device comprises a first impaction plate, a second impaction plate and a third impaction plate, the second impaction plate is arranged opposite to the first impaction plate; the stranded wire is wound on a stranded wire connecting seat, the first end of the stranded wire is connected with a stranded wire end seat, the stranded wire end seat is fixedly connected with the second impaction plate, and the second end of the stranded wire extends out of the space between the second impaction plate and the first impaction plate and is connected with a stranded wire take-up and pay-off device; the stranded wire take-up and pay-off device can tighten and release the stranded wire; the elastic structures are arranged between the first impaction plate and the second impaction plate, the first ends of the elastic structures are fixedly connected with the first impaction plate, and the second ends of the elastic structures are fixedly connected with the second impaction plate.

The invention relates to a preparation method of a cadmium telluride or cadmium zinc telluride polycrystal material. The preparation method is characterized by comprising the following preparation process flows of: (1) cleaning and drying a first crucible, a second crucible capable of being put into the first crucible and a first cover covering the first crucible; wherein the first crucible is provided with an annular groove along the peripheral wall; the top of the first cover is closed, the bottom is open, and the side wall can be inserted into the annular groove; and a hole is formed in thebottom of the second crucible; 2) weighing elemental tellurium and elemental cadmium according to the proportion of cadmium telluride to be synthesized; or weighing elemental tellurium, elemental cadmium and elemental zinc according to the ratio of cadmium zinc telluride to be synthesized. According to the preparation method, a liquid sealing technology is adopted to prevent volatilization loss of cadmium vapor, and the first crucible can be repeatedly used, so that the cost is reduced; by reducing the instantaneous reaction amount of tellurium and cadmium, the severe degree of the telluriumand cadmium combination reaction is reduced, the pressure resistance requirement on synthesis equipment is reduced, and the equipment cost is reduced.

The invention provides a low-spatter-rate ER50-6 gas-protection solid welding wire. The low-spatter-rate ER50-6 gas-protection solid welding wire comprises a steel wire base body and a copper platinglayer which is coated on the surface of the steel wire base body. The steel wire base body comprises the following components of, by weight percentage, 0.06%-0.10% of C, 0.80%-1.00% of Si, 1.40%-1.60%of Mn, 0.010%-0.015% of S, less than or equal to 0.015% of P, less than or equal to 0.015% of Mo, less than or equal to 0.015% of Ni, less than or equal to 0.30% of Cu, less than or equal to 0.015% of Cr, less than or equal to 0.03% of V, 0.02-0.08% of Al, less than or equal to 0.008% of O, less than or equal to 0.007% of N and less than or equal to 0.0012% of Ca, the balance being Fe. The low-spatter-rate ER50-6 gas-protection solid welding wire adopts the method of chemical component control to control the transition form of dissolved drops and ensure the stability of transition of the dissolved drops, so that the effect of reducing the welding spattering rate is realized.

This invention relates to a rhombic suspending and steering mechanism. Its suspending part consists of a front-rear suspending and a middle-suspending unit. The front-rear suspending unit consists of two longitudinal swing arms and torsion springs. The both longitudinal swing arms are respectively connected with front and rear wheel at their both ends, and connected with chassis via a torsion spring. The middle suspending unit consists of two lateral swing arms and torsion springs. The both lateral swing arms are respectively connected with one of side wheels at one of their ends, and connected with the chassis via a torsion spring. The steering part consists of a steering frame and a swing lever. The steering frame is connected with the front and rear wheels, and the swing lever, of which front portion is equipped with a large gear wheel engaged with a small gear wheel that is connected with the steering wheel. The front wheel and rear wheel are located on a lnogitudinal line. The suspending mechanism occupies space less and can turn in a short radius. It has a bumping effect due to its front suspending unit when a collision occurs.