69results about How to "Meet the needs of scientific research" patented technology

The invention discloses a fast decoupled flow calculation method for power systems, which comprises the following steps of: inputting original data and initializing voltage; forming an admittance matrix; forming correction equation coefficient matrixes B' and B'' and performing factor table decomposition; performing P-theta iteration, and correcting a voltage phase angle; performing Q-V iteration, and correcting voltage amplitude; judging whether the iteration is converged; and calculating node power and branch power. The method requires that the P-theta iteration and the Q-V iteration are all converged in the same iteration and the iteration process is finished, so that the algorithm frame is simpler, and the flow is clearer. The sparse matrix technology is not adopted, so the matrix elements are convenient to access and calculate, and the programming is simple; the correction equation coefficient matrixes are stored according to n order, number change of nodes is avoided, and the programming difficulty is reduced; and the calculation amount is reduced through reasonable logic judgment, the calculation speed is obviously improved and the requirement of scientific research can be completely met. The fast decoupled flow calculation method also can process power systems with a plurality of balance nodes.

The invention relates to an experimental method for constructing a Hutat2:Fc gene knock-in monocyte by using a CRISPR / Cas9 technology. The experimental method is characterized by comprising the following steps of (1) CRISPR / Cas9 targeting plasmid construction; (2) donor plasmid construction; (3) primary generation monocyte sorting; (4) monocyte transfection through electroporation; and (5) knock-in efficiency identification. The experimental method for constructing the Hutat2:Fc gene knock-in monocyte by using the CRISPR / Cas9 technology has the advantages that the method is simple and implemented easily, subsequent cell screening is not needed, the higher gene editing efficiency can be obtained, the feasibility and application prospect of the experiment are greatly increased, and the application range is wide.

The invention provides an ultra-deep sea bed sediment ropeless gravity sampling system, mainly comprising a recycling unit and a discarding unit; the recycling unit comprises a beacon, a floating component, a rope and a sampler inner tube; the beacon is positioned at the top end of the floating component; the floating component, the rope and the sampler inner tube are connected with each other in sequence; the discarding unit comprises a sampler outer tube, a counterweight and a trigger unlocking mechanism; the counterweight peripherally arranged at the upper portion of the outer wall of the sampler outer tube; the trigger unlocking mechanism sleeves the outer wall of the sampler outer tube below the counterweight. The ultra-deep sea bed sediment ropeless gravity sampling system has higher reliability and safety and has lower cost than existing rope sampling methods.

The invention discloses a LabView-based real-time monitoring system for a laser cladding / laser re-melting process temperature field, which comprises a software control part and a temperature measuring device, wherein the software control part is composed of a LabView program and a single chip program; the temperature measuring device is composed of an infrared temperature measuring sensor, a single chip, a single chip power supply module, a sensor power supply module, a 22.1184MHz crystal oscillator, a resetting circuit and a laser processing machine tool; the system can be used for realizing the functions of real-time collecting and dynamic monitoring for the temperature data in the laser processing processes of laser re-melting, laser cladding and laser welding, high-temperature alarming, temperature data storage and output, setting for different temperature curve display modes, temperature curve picture output, setting for different temperature precisions, dynamic display of temperature curves, data playback, check and editing, and the like; and the sensors with different temperature measuring scopes are selected according to the temperature measuring demand, so that the temperature measurement within the scope of 0-2500 DEG C is realized.

The invention discloses a Newton-process power flow calculation method for study purpose and provides a Newton-process power flow calculation method which is easy to correct and maintain for research personnel conducting further researches on the basis of Newton-process power flow calculation. Adopting the basic principle steps of a polar coordinate Newton method, the invention provides a method for improving the speed of power flow calculation by avoiding unnecessary calculation through simple logic judgment on the basis of the analysis of the components of the power flow calculation. In thetechnical scheme of the invention, unnecessary calculation is avoided by making simple judgment in a Jacobimatrix forming module and a correction equation Gaussian elimination module. When the methodis used for performing calculation on a 445 node actual large-size grid, the calculation time is 0.484s, and the calculation speed can meet requirements for scientific research completely.

The invention discloses an all-solid-state repetitive-frequency nanosecond pulse source, which comprises a primary energy storage capacitor C0, an insulated gate bipolar transistor (IGBT) semiconductor device, a saturable pulse transformer PT, a first secondary energy storage capacitor C1, a second secondary energy storage capacitor C2, a pre-magnetic switch MS1, a post-magnetic switch MS2, a post-energy storage capacitor C3, a fast recovery diode D-sos with a semiconductor open switch (SOS) effect, a resistive load Rx and a series inductor L. The magnetic switches are in fit with the fast recovery diode D-sos to produce high-voltage steep pulses. In the all-solid-state repetitive-frequency nanosecond pulse source, the common fast recovery diode is adopted instead of an SOS device with high cost, and has remarkable sharpening effects on the pulses; and a miniature pulsed power supply also has high performance, and can satisfy the needs of most of civilian industries and scientific researches.

The invention provides a distributed three-phase four-wire photovoltaic grid-connected device with an electric energy adjusting function, belonging to the technical field of a multifunctional photovoltaic grid-connected device and aiming to solve the problem that the conventional device cannot compensate an idle component, a harmonic component and an unbalanced component which are generated by a user electricity load and cannot remove pollution on a power grid caused by grid-connected currents of the components. The distributed three-phase four-wire photovoltaic grid-connected device comprises the power grid, the user electricity load, a photovoltaic array, a DC (Direct Current) / DC converter, a three-phase four-wire grid-connected inverter, a digital signal processing control unit, a circuit breaker, a first detector and a second detector. The first detector is used for detecting the output-phase current at the alternating current side of the three-phase four-wire grid-connected inverter and the input voltage and the input current of the user electricity load; and the second detector is used for detecting the output voltage and the output current of the photovoltaic array. According to the invention, the photovoltaic grid-connected device which is used for production and scientific research of multidirectional development of solar energy sources and is particularly applicable to a photovoltaic grid-connected generation device which is combined with buildings and is connected into the power grid in a three-phase four-wire manner is provided.

The invention discloses a method for determining the content of gamma-aminobutyric acid in red yeast through a high-efficient liquid chromatography. The method comprises the steps of (1) extracting the gamma-aminobutyric acid: adding the measured red yeast sample into water, ultrasonically extracting, centrifuging, and collecting the supernatant; (2) precipitating alcohol: adding ethanol and salt solution into the supernatant to execute alcohol precipitation, centrifuging the solution, and collecting the alcohol precipitation supernatant; (3) carrying out enzyme treatment: separating the solvent from the alcohol precipitation supernatant, and adding a composite enzymic preparation to execute enzyme treatment; (4) carrying out depigmentation: adsorbing the enzyme treated concentrated solution onto a column, adsorbing the solution with resin, eluting the solution with ammonia water; filtering the elution solution by utilizing a micro-pore filter membrane, wherein the filtered liquid is the detected liquid; (5) executing pre-column derivatization on the detected liquid, i.e. determining the content of the gamma-aminobutyric acid by adopting the liquid chromatography. By adopting the steps of alcohol precipitation, enzyme treatment and depigmentation, the content of impurities in the gamma-aminobutyric acid can be effectively removed, the interference in the detection process can be reduced, the detection accuracy can be effectively improved, and the detection result is reliable and stable.

The invention provides an efficient oryzias latipe breeding and hatching method. The efficient oryzias latipe breeding and hatching method comprises the steps that 1, parent fish pairing is performed according to the proportion of 18 females and 16 males; 2, spawning induction is performed, the light irradiation time is controlled to be 16 hours in the daytime and 8 hours at night, and the water temperature is controlled to be 24-27 DEG C; 3, artificial spawn taking performed; 4, hatching is performed in young oryzias latipe hatching boxes; 5, oryzias latipe fries are bred till the oryzias latipe fries grow to be mature sexually, then parent fish is selected again for execution of the step 1, operation is performed in cycles to form an oryzias latipe breeding and hatching circulation system, and a large number of oryzias latipe can be provided for water environment detection and zoological experiments in our country. The efficient oryzias latipe breeding and hatching method is good in breeding controllability and high in breeding efficiency and has high hatching rate and fry survival rate.

The invention discloses an interpretation and evaluation method for water layer recognition by a logging while drilling Q parameter. The method comprises the following steps of: a, collecting and sorting target layer logging engineering parameters and geological parameters; b, using the logging engineering parameters and the geological parameters to calculate a logging Q parameter response value; c, drawing a diagram according to the logging Q parameter response value; and d, using a discriminating chart to realize water layer development condition recognition while drilling. The interpretation and evaluation method has the beneficial effects that the advantages of timeliness, high efficiency, realness and high speed of the logging hydrocarbon value parameter while drilling interpretation are realized; and the logging engineering and geological parameters are integrally used for realizing the water layer development condition recognition while drilling.

The invention relates to a method for separating and extracting pediocin PA-1 from a fermentation solution. The method comprises the following steps: inactivating protease of the fermentation solution, releasing the pediocin PA-1 in the fermentation solution, performing plate-frame filtration to remove bacteria and granular impurities, performing microfiltration to remove high molecular weight impurities and performing two-step ultrafiltration: namely, the first step: selecting an ultrafiltration membrane with the molecular weight cutoff of 10000-30000 daltons with the main purpose of removing high molecular weight proteins, nucleic acid, colloid and the like; the second step: selecting the ultrafiltration membrane with the molecular weight cutoff of 1000-3000 daltons with the main purposes of removing small molecular weight impurities and concentrating. A concentrated solution is finally purified by C18 preparation chromatography and freeze-dried or added with common salt filler for spray-drying to get a powdery finished product. The process method disclosed by the invention has the advantages of whole-process fluid operation, low energy consumption, low labor intensity, mild conditions, easy industrial amplification, stable product quality, no consumption of an organic solvent, safety and environment-friendly property, and is suitable for a variety of follow-up purification methods.

An intelligent composting reactor system is disclosed. The system includes a reactor tank body, a temperature monitoring part used for monitoring the temperature inside the tank body, a vacuum pump, an oxygen concentration monitoring part used for monitoring the oxygen concentration inside the tank body, a gas condensing part, a heating and insulating part and a PLC control part. The bottom of the reactor tank body is provided with a first gas port and the top of the reactor tank body is provided with a second gas port. A gas distributing screen is arranged along the radial direction at the inner lower part of the reactor tank body. An aeration pipeline is disposed under the gas distributing screen. The aeration pipeline is isolated from a material by utilizing the gas distributing screen. The aeration pipeline is provided with a plurality of aeration holes and is communicated with the first gas port. The first gas port is connected to the vacuum pump through the gas condensing part. The vacuum pump can perform gas exhausting to form a negative pressure in the reactor tank body. The gas condensing part is used for condensing water vapor in exhausted reaction tail gas. The heating and insulating part is attached to the reactor tank body. The PLC control part is connected to the vacuum pump, the heating and insulating part, the temperature monitoring part and the oxygen concentration monitoring part.

Provided is a measuring method for gun shooting time. On the condition of acetic acid (HAC), nitrite and sulfanilic acid (SN) have a diazo reaction and then couple with alpha-naphthylamine (NC) for coloration. Based on the light absorption characteristic of the product, spectrophotometry is adopted to measure the content of nitrite in shooting residue. The residue in a gun barrel obtained at different time after shooting is extracted for analysis, a relation curve of the content of nitrite and shooting time is obtained, and thus gun shooting time is determined. The measuring method for gun shooting time is capable of providing an effective method for detection of gun shooting time, causes no damage to a gun on the premise of guaranteeing extraction effect, has the advantages of being accurate, fast, high in sensitivity, good in stability, reliable in results and the like, and meets the requirements for detection and scientific research of gun shooting time.

The invention discloses an aquatic animal fertilized ovum in-vitro incubation device. The aquatic animal fertilized ovum in-vitro incubation device is characterized by comprising a water tank, wherein columnar sponges are arranged inside the water tank, a plurality of grooves are evenly formed in the outer side walls of the columnar sponges, central water adsorption tubes are inserted into the center of the columnar sponges, a plurality of small holes are evenly formed in each central water adsorption tube, a drain pipe with a valve is arranged at the tail end of the central water adsorption tube through a submerged pump, the outlet end of the drain pipe is communicated with an external filter which is provided with a plurality of layers of filter cotton in a placement mode, the external filter is also communicated with the water tank through a drain pipeline, the columnar sponges and the central water adsorption tubes are matched with each other, the number of the columnar sponges and the number of the central water adsorption tubes is multiple, the tail end of each central water adsorption tube is connected with the drain pipe through the submerged pump, a temperature control heater is further arranged in the water tank, and a plurality of horizontal grooves are further formed in the grooves. The aquatic animal fertilized ovum in-vitro incubation device can imitate a slight water running environment in natural conditions, and can keep an incubation water body to be clean and keep the environment to be stable.

The invention provides a device and method for testing lateral pressure of a support of a foundation pit during stratified excavation and non-uniform displacement. The device comprises a spliced barrier wall, loading bolts, loading corners, micro soil pressure sensors, a rubber thin film and a model box, wherein the spliced barrier wall and the loading bolts are arranged on one side wall of the model box; the spliced barrier wall is located on the inner side of the side wall and parallel to the side wall; a plurality of longitudinal reinforcing ribs and transverse reinforcing ribs are arranged on the outer side of the side wall; the spliced barrier wall is formed by splicing a plurality of equal-height wall pieces; the micro soil pressure sensors are arranged on all the wall pieces; the rubber thin film covers and is adhered to the wall pieces; one end of each of the multiple loading bolts penetrates through the side wall from the outside of the model box to splice all the wall pieces of the barrier wall; the loading bolts can be twisted. The device can simulate the lateral pressure of a support structure in a stratified excavation process of the foundation pit to provide a basis for engineering design and supporting; a distribution rule of the lateral pressure of the support structure during non-uniform displacement and a ruler that the lateral pressure changes with the displacement can be researched.

Semiconductor refrigeration equipment achieving heat radiation through heat pipes comprises a system power supply, a temperature control system, a heat radiation system, a reaction tank and a magnetic stirring system. A reaction trough is arranged on the innermost side of the reaction tank, a thin copper layer is arranged outside the reaction tank, semiconductor chilling plates are closely attached to the outer side of the thin copper layer, and a heat insulation layer is arranged on the outer sides of the semiconductor chilling plates, and wrapped by an aluminum alloy shell. The temperature control system comprises a temperature control instrument, a temperature sensing probe, a control single plate, the semiconductor chilling plates and a semiconductor chilling plate power source, the temperature control instrument can be used for displaying and setting the temperature of the reaction trough, and the control single plate is responsible for coordinating various kinds of work. The heat radiation system comprises the heat pipes, cooling fins and a fan. The heat delivery surfaces of the semiconductor chilling plates are surrounded by the heat pipes, heat generated by the heat delivery surfaces is constantly led out of the heat pipes, and it is ensured that the semiconductor chilling plates work normally. A magnetic rotor is arranged at the bottom of the reaction trough, a magnetic stirrer drives the rotor to rotate, and the magnetic stirring system is formed. The system power supply supplies power to the whole system.

The invention discloses a high-beam direct-current hollow cathode plasma source which comprises a sealing pipe, a hollow electrode, a cathode plate, a connecting plate, a first anode plate, a second anode plate, an arc strike spacer bush and a control power supply. The hollow electrode is installed on the cathode plate, the sealing pipe is connected with the cathode plate and sleeves the hollow electrode, the top of the sealing pipe is provided with a gas leading-in port for inputting gas into the hollow electrode, and the connecting plate is used for performing sealed connection of the cathode plate and the first anode plate and forms an electric potential difference between the cathode plate and the first anode plate. A high density plasma beam is formed between the second anode plate and the hollow electrode. The arc strike spacer bush is arranged between the hollow electrode and the second anode plate. The control power supply is provided with an anode, a cathode and an arc strike electrode. The anode is connected with the second anode plate, the cathode is connected with the cathode plate, and the arc strike electrode is connected with the first anode plate. The high-beam direct-current hollow cathode plasma source can meet the use requirements on various gases, the plasma beam high in ionization rate can be generated, and thus the energy conversion efficiency is effectively improved.

The invention relates to a portable precision digital optical microscope and belongs to the technical field of digital optical microscopes. The micro lens of the digital optical microscope is a plano-convex lens with a short focal length. A CCD image sensor is fixed to an image sensor installing frame. The bottom of the image sensor installing frame is successively in threaded connection with an image sensor installing seat, an upper lens cylinder, a lower lens cylinder, and a lens seat. The bottom of a fine tuning knob is abutted against the top surface of a slide body sliding in a guide body. The top of a tension spring hangs over an upper spring pin fixedly connected with a guide body. The bottom of the tension spring hangs over a lower spring pin fixedly connected with a slide body. An LED lamp assembly, a sample glass slide, the micro lens, and the CCD image sensor are arranged in the same straight line. The digital optical microscope is small in size, light in weight, low in price, good in imaging, easy to establish and carry, capable of wirelessly transmitting pictures and accurately controlling a sample position, accurate in focusing, and especially suitable for being used under rigorous conditions of timely detection and outdoor investigation.

The invention relates to a method for asymmetrically synthesizing a dihydrofuran-2-(3H)-one compound under the catalysis of nickel, wherein the method comprises the steps: by taking gamma-ketonic acid as a raw material, adding a nickel catalyst, a ligand and Lewis acid in an organic solvent environment in which hydrogen is taken as a hydrogen source at the pressure of 0.1-6 MPa and the temperature of 50-90 DEG C, and carrying out hydrogenation reaction to synthesize the dihydrofuran-2-(3H)-one compound. By adopting a transition metal-lewis acid synergistic catalysis strategy and taking nickel acetate tetrahydrate as a transition metal catalyst, the preparation method has the advantages of easiness in obtaining and low cost; zinc trifluoromethanesulfonate is added, so that the reaction temperature is greatly reduced from 150 DEG C to 70 DEG C, and compared with a metal catalytic reaction in the prior art, the reaction is milder. The method disclosed by the invention is wide (suitable) in application range, simple in catalytic system, simple and convenient to operate and high in yield and enantioselectivity (the yield is as high as 97%, and ee is as high as 95%), the production cost is greatly reduced, and the method has remarkable social benefits and economic benefits.

The invention discloses a culture method of mouse lung organs and a special culture solution thereof. The method comprises the following steps: acquiring fresh mouse lung tissue cells, digesting into single cells by collagenase, culturing mouse lung tissue organoid under an in-vitro three-dimensional culture condition, and performing immunofluorescent staining on the lung organoid. The culture solution is prepared from ADF < + + + + >, an RPSO1 conditional culture medium, a Noggin conditional culture medium, a B27 additive, N-acetyl-L-cysteine, nicotinamide, Y-27632, A83-01, SB202190, a recombinant human fibroblast growth factor-7 and a recombinant human fibroblast growth factor-10. Experiments show that the lung organ established by the method disclosed by the invention can effectively maintain tissue cell specificity, stem cell characteristics and biological functions, and meets the requirements of scientific research.

The invention discloses a BBPV real-time three-dimensional navigation system. The BBPV real-time three-dimensional navigation system comprises a head posture detection device and an information receiving end. The head posture detection device is carried on the head of a patient and used for outputting posture detection signals after head postures of the patients are detected in real time. The information receiving end is coupled to the head posture detection device, internally stores a three-dimensional semicircular canal model to receive the posture detection signals and adjusts the spatial orientation of the three-dimensional semicircular canal model according to the posture information in the posture detection signals. The information receiving end is internally provided with a displayscreen which is used for displaying the three-dimensional semicircular canal model after the spatial orientation is adjusted. The BBPV real-time three-dimensional navigation system can effectively detect head postures of patients by arranging the head posture detection device and the information receiving end, then present a model in the information receiving end, and then conduct auxiliary treatment through the model.

The invention relates to a fault arc signal simulation generating device. The device includes a fault arc signal acquisition device, a fault arc signal digitization device, a central processing and control unit and a program-controlled power amplification unit. The central processing and control unit includes a fault arc sample memory and a shielded load sample memory, a digital synthesis unit and a digital-to-analog converter. . This device uses the arc fault signal acquisition device to digitize the various arc fault signals collected by the arc fault signal digitization device and store them in the arc fault sample memory and the shielded load sample memory. When a certain type of arc fault signal is required to be output, from The required arc fault signal waveform can be obtained by taking corresponding samples from the arc fault sample memory and shielded load sample memory and synthesizing them, thereby omitting a large number of experimental devices that need to generate arc faults.

The invention discloses a coal bed similar material and a preparation method thereof. The coal bed similar material is prepared from the following raw materials in percentages by weight: 15% to 36% of pulverized coal, 18% to 45% of aluminate cement, 10% to 35% of gypsum, 0.5% to 3.6% of active carbon, 0.4% to 1.8% of a polycarboxylate superplasticizer, 0.2% to 1.0% of sodium dodecyl sulfate, 0.3% to 1.5% of carboxymethylcellulose and 10% to 35% of water. The preparation method comprises the following steps: weighing the raw materials in proportion; uniformly mixing the pulverized coal, the aluminate cement, the gypsum, the active carbon and the carboxymethylcellulose to prepare a powder material A; adding water to the polycarboxylate superplasticizer and the sodium dodecyl sulfate, and uniformly stirring to prepare a liquid material B; adding the powder material A into the liquid material B, and uniformly mixing; then putting a mixture into a mold, and carrying out compression molding; conserving the material for 14 d after forming so as to obtain the similar material. The similar material is similar to a real coal bed, is simple in preparation method, easy in operation and high in stability, and has wide practicability.

The invention provides a signal communication delay analog method for digital simulation. The method comprises the steps of building a communication delay control module, wherein the communication state and the delay time are configurable parameters; changing the communication state parameters, performing analog for the circumstance of signal communication delay under normal communication and communication suspending; configuring transmission delay time parameter according to different transmission delay times of each part of an actual system, wherein the transmission signal data are of integral or floating point type; the communication delay of the signals of the floating point type and the integral type under the same delay time are subjected to analog at the same time or by groups; the communication delay of a plurality of signals of the same data type is subjected to analog at the same time or by groups. With the adoption of the method, the signal communication delay of the actual system can be subjected to analog, and thus the model accuracy is improved.

The invention discloses a method for purifying humin in soil, which comprises the following steps: ground and sieved a soil sample, washed with water, acidic, alkali washed, mixed pickling, Soxhlet extraction, mixed pickling, washed with water and freeze-dried to obtain humin solid. Compared with the prior art, the humin obtained by the invention has a low ash content of only 0.570-0.725%, which can meet the needs of scientific research on soil organic matter and provide technical support for scientific research on soil organic matter.

The invention discloses a method for measuring high-silicon high-carbon steel wire rod austenite grain size. The method comprises the following steps: S1 sample preparation, processing a steel wire rod into a round rod with a length of 10cm and a diameter of 6mm; S2 sample processing, heating the round rod on a thermal simulation tester to 850-1200 DEG C and keeping at a temperature for 10 to 60 minutes, then cooling to 700-720 DEG C at a rate of 30K / s and keeping at a temperature for 10 minutes, and then rapidly cooling to room temperature; S3, sample observation, cutting, inlaying and polishing samples processed by S2 sample processing, corroding the samples with aqueous solution of sodium picrate, and using a metallographic microscope for measuring the grain size. The method can clearlydisplay original austenite grains, images of the samples are very clear in the entire cross section, success rate is high, and the method can meet the needs of scientific research.

The invention relates to the technical field of preparation of animal models, and specifically discloses a construction method of a post-transplantant candida albicans pulmonary infection mouse model. The construction method comprises the following steps: selecting a male C57BL / 6J mouse at the age of six to eight weeks as a donator, a male Balb / c mouse at the age of six to eight weeks as a receptor, and ciclosporin A as an immunosuppressor to construct a mouse skin transplantation model; and dropping 200 mu l of 5*10<5> CFU / ml candida albicans suspension into the body of the mouse suffering from lower back skin transplantation operation 7 days after the skin transplantation operation to obtain the post-transplantant candida albicans pulmonary infection mouse model. According to the construction method of the post-transplantant candida albicans pulmonary infection mouse model, the prepared mouse model is closer to the actual occurrence condition of post-transplantant fungal infection of a clinical patient; in addition, the model is stable; moreover, the method is simple and fast; a large number of stable mouse infection models can be obtained at a time for researchers to use in relevant study on clinical problems.

The invention belongs to the technical field of organic fluorides, and discloses a preparation method and application of fluoroolefin. The method includes: under the catalysis of light, difluoroalkylation-defluorination reaction with ethyl difluoroiodo acetate as a fluorine source is carried out, and aryl benzyl ketonization is utilized to carry out high stereoselectivity synthesis of fluoroolefin. According to the method, ethyl difluoroiodo acetate is used as a fluorine source to prepare the monofluoroolefin compound with high selectivity, so that the production cost can be greatly reduced, and the method has remarkable social benefits and economic benefits. The method is simple in catalytic system, simple and convenient to operate and good in selectivity. A photocatalysis strategy is adopted, and compared with existing metal catalysis, the method is greener and more environmentally friendly. According to the synthesis method, the difluoroalkylation-defluorination reaction taking ethyl difluoroiodo acetate as a fluorine source has relatively high regioselectivity, mild reaction conditions and a wide reaction range, fluoroolefin can be efficiently synthesized, scientific and technological application can be achieved, medicine development is promoted, and the requirements of scientific research are met.

The invention discloses a sheet adhering method for detecting bending residual stress. The sheet adhering method comprises steps of choosing a sheet adhering position for a detection workpiece, adhering a strain gage on a sheet adhering position, fixing a detection workpiece on a press machine, connecting the strain gage to a stress gauge through a lead, detecting and recording an original value, detecting and recording a stress value when the workpiece is bent, and taking the stress value as a bending stress value when the detection workpiece begins to deform. The sheet adhering method for detecting bending residual stress finds out an association relation between the stress value and the bending residual stress, and provides a method for finding out what magnitude of the stress value can cause deformation of H-shaped steel.

The invention belongs to the design technical field of the service life accelerated assessment for sensitive elements and relates to a method for checking the service life of a liquid-filled sensitiveelement and a special tool part therefor. The service life assessment for the liquid-filled sensitive element can be equivalent to the assessment for the leakage amount of the sensitive element. Themethod comprises the following step of applying a concentrated force to the sensitive element so as to increase the uniform distribution force of the liquid. The leakage rate of the sensitive elementis increased after the uniform distribution force of the liquid is increased. The accelerated assessment for the service life of the sensitive element is achieved by measuring the leakage amount of the liquid in a specified period of time. According to the invention, the service life of the sensitive element can be accelerated, and the assessment time can be shortened.