14 results about "Gamma ray irradiation" patented technology

This invention belongs to the field of agricultural and forestry biotechnology, and relates to a method utilizing... 60 A method to increase the oviposition rate of beet armyworm by Co-γ irradiation was used. Beet armyworm pupae within 12 hours of pupal instar were collected and subjected to effective accumulated temperature treatment. Then, for male beet armyworm pupae, [further methods were employed]. 60 Co-source irradiation treatment; irradiated male beet armyworm pupae and unirradiated female pupae were placed in an incubator to cultivate and emerge as adults. The adults were then transferred to adult rearing cages and supplemented with honey water for nutrition. This invention, through effective accumulated temperature treatment, selects a large number of uniformly developed male beet armyworm pupae as irradiation targets. While ensuring emergence rate and adult lifespan, it significantly increases the egg production of beet armyworms and the yield of test insects. The operation process is simple, safe, and reliable. It provides a large source of production insects for the convenient and rapid use of beet armyworms to produce the biological control agent nucleopolyhedrovirus, and for using the insect as a host to propagate natural enemy parasitic wasps.

The invention discloses an underwater super-oleophobic film for oil field logging and a preparation method of the underwater super-oleophobic film, and belongs to the technical field of functional film materials and logging tool surface protection. The method comprises the following steps: carrying out decontamination, degreasing and alkaline activation on the outer surface of a logging instrument, forming a film on the surface of a substrate, grafting a modified chitosan solution, and applying gamma-ray irradiation in a wet acid environment to realize three-dimensional cross-linking among chitosan molecular chains, so as to obtain an organic base film with hydrophilicity and adhesive force. And then immersing the organic base membrane into a mineralization solution obtained by dispersing calcium carbonate, bubbling carbon dioxide and carrying out solid-liquid separation, so that carbonate is subjected to induced nucleation and controlled growth on the surface of the membrane to form an inorganic mineralization layer, and an organic-inorganic hybrid membrane with a micro-nano coarse structure is constructed. The thin film shows underwater super-oleophobic and low-adhesion characteristics in a saline water environment, has mechanical strength and anti-scouring capacity, can reduce pollution of oil stains to a logging instrument shell and signal attenuation, and improves logging data reliability.

This invention provides an improved depth filtration medium with reduced extractant for DSP filtration and clarification applications. Furthermore, it provides an improved depth filtration medium that is compatible with gamma irradiation-based filter sterilization processes. [Solution] A depth filtration medium is provided for clarifying the recovered material from a feed stream of a cell culture containing therapeutic biomolecules. The depth filtration medium is composed of a sintered mixture of a polymer adsorbent and a thermoplastic binder, has extremely low extractability, and does not require pre-washing before use. Furthermore, the constituent materials used in the sintered depth filter medium exhibit high stability to gamma rays and are compatible with gamma-based pre-use sterilization processes.

This application provides a method for degrading antibiotic resistance genes in penicillin fermentation residue, comprising: Step S1, providing penicillin fermentation residue to be treated. The penicillin fermentation residue contains at least one target antibiotic resistance gene. Step S2, subjecting the penicillin fermentation residue to gamma ray irradiation treatment. This application addresses the problems of low removal rate of antibiotic resistance genes (ARGs), easy rebound, high treatment cost, and high risk of secondary pollution in existing penicillin fermentation residue treatment technologies by subjecting the penicillin fermentation residue to gamma ray irradiation treatment.

The invention discloses a high polymer material radiolysis micromolecule product detection method which comprises the following steps: S1, filling a high polymer material into a solid phase microextraction device to form a negative pressure state; s2, performing gamma ray irradiation on the solid-phase microextraction device; s3, solid-phase microextraction fibers in the solid-phase microextraction device are taken out, and radiolysis micromolecule products adsorbed on the solid-phase microextraction fibers are analyzed through a gas chromatography-mass spectrometer; and S4, analyzing and determining the chemical structure of the radiolysis small molecule product, establishing a quantitative working curve between the peak area and the concentration of the standard product by combining the standard product, and calculating to obtain the content of the radiolysis small molecule product of the high polymer material under the radiation dose. According to the invention, solid-phase microextraction is combined with gas chromatography-mass spectrometry to analyze small molecular substances after high polymer materials such as rubber, resin and the like are irradiated, so that the ray irradiation resistance of the high polymer materials is evaluated; by combining qualitative and quantitative analysis methods, the content of micromolecular products of the high polymer material under different radiation doses can be obtained.

The invention discloses gamma ray irradiation resistant optical glue as well as a preparation method and application thereof, and belongs to the field of adhesive composition and preparation. The formula of the optical glue comprises an acrylate monomer and a methacrylate monomer which are specifically combined and proportioned, and nano silicon dioxide is used as a radiation stabilizer, and a benzene ring-containing plasticizer is used cooperatively. The core of the technical scheme is a specific acrylate-methacrylate copolymer system, nano silicon dioxide is introduced as a radiation stabilizer, a benzene ring-containing plasticizer is added, and the overall good effect that the glue is resistant to gamma ray irradiation is achieved by utilizing the synergistic effect of the nano silicon dioxide and the benzene ring-containing plasticizer. According to the invention, photooxidation and free radical chain reaction which cause yellowing are inhibited in a targeted manner, and the anti-yellowing performance and the like are more excellent. The method is crucial for optical coupling application, can maintain high light transmittance for a long time, and ensures that the signal-to-noise ratio of the detector is not degraded.

The application belongs to the field of high polymer materials, and discloses a method for preparing high-strength wear-resistant nylon 66 material, wherein a silane coupling agent and a cross-linking promoter are coated on the surface of nano silicon dioxide, and the stability of the coating structure is improved through gamma ray irradiation, so that the mechanical properties and wear resistance of the nylon 66 can be improved after the nylon 66 is added, and meanwhile, the nylon 66 of the application can still maintain good rigidity and wear resistance and has excellent comprehensive performance after long-term use.

A friction device and its application method for simulating a hybrid field of microgravity, radiation, and temperature on an extraterrestrial body can meet the demand for simulating material damage under extreme conditions in the cosmic environment (high radiation, extreme temperature, and extreme gravity). This invention uses high-permeability magnetic materials, a vacuum pump, and a gamma radiation source to simulate the cosmic environment. Traditional "stretching suspension" methods are designed for medium or large spacecraft and robotic arms, but cannot balance the partial gravity on small particles by stretching and suspending them. This device overcomes the gravity of small molecular particles by constructing Maxwell coil pairs to achieve a gradient magnetic field, improving the reliability of the simulated environment. Simultaneously, this invention can simulate the extremely cold or hot climate conditions, vacuum conditions, and high-energy gamma-ray radiation conditions of the lunar surface. Furthermore, it can be used to conduct wear tests on high-performance aerospace materials under hypergravity or weightlessness conditions caused by Martian dust and interstellar dust.

This invention discloses a method for preparing high-performance oxygen evolution electrocatalysts based on gamma-ray irradiation. The method includes pretreating a foamed metal substrate; dissolving at least one of an iron salt, cobalt salt, and nickel salt in ultrapure water to obtain an iron / cobalt / nickel salt solution; in-situ growing an iron / cobalt / nickel catalyst precursor on the pretreated metal foam substrate using a hydrothermal method or a combination of hydrothermal and high-temperature calcination; and irradiating the iron / cobalt / nickel catalyst precursor with gamma rays to obtain the oxygen evolution electrocatalyst. The molar ratio of the iron salt, cobalt salt, and nickel salt is x:y:z, where x, y, and z are independently selected from 0 to 1, and x, y, and z are not simultaneously zero. This invention can successfully synthesize iron-cobalt-nickel-based OER electrocatalysts with excellent activity and stability, thereby accelerating the efficiency of water electrolysis. This preparation method has good versatility and provides a new approach for the preparation of non-precious metal OER catalysts.

The application discloses an irradiation method for improving defects of perovskite quantum dots, and the method comprises pretreatment, optional low-energy electron irradiation or low-energy proton irradiation or low-dose gamma ray irradiation, and post-treatment: firstly, washing and drying glass embedded with ABX3 type perovskite quantum dots; and then, irradiating the glass by low-energy electrons or low-energy protons or low-dose gamma rays with specific parameters, so as to improve defects and improve performance. The method has strong pertinence, can improve photoluminescence quantum yield of perovskite quantum dots, improves photoelectric conversion efficiency of a solar cell prepared based on the perovskite quantum dots, is suitable for aerospace application scenarios, is simple to operate and can be scaled up, and provides key technical support for application of perovskite solar cells in the field of spaceflight.

The invention belongs to the technical field of food preservation, and particularly relates to a postharvest cherry preservation method based on low-dose gamma-ray irradiation. The method comprises the following steps: picking cherries in a commodity mature period, irradiating the cherries with low-dose < 60 > Co-gamma rays, and storing the cherries on a shelf. The method is characterized in that the irradiation dose is selected in a targeted mode according to the variety of the cherries, the reduction of the hardness of the fruits can be effectively delayed, the accumulation of the content of soluble solids is promoted, and therefore the texture and flavor of the cherries are maintained, and the dose range is generally 25 Gy to 200 Gy. According to the method, variety-specific low-dose irradiation treatment is adopted, the commodity of cherries is effectively maintained, meanwhile, the edible quality (hardness and flavor) of the cherries is remarkably improved, the problems of fruit softening, flavor deterioration and the like caused by a traditional high-dose irradiation technology are solved, and an efficient, safe and quality-oriented new method is provided for preservation of the picked cherries.

The invention discloses a gamma ray irradiation device for nuclide identification instrument calibration, which is characterized by comprising a radioactive source shielding container, a radioactive source selection device, a gas path opening and closing device, a pneumatic transmission gas inlet pipeline and a radioactive source pneumatic transmission channel, wherein the radioactive source selection device comprises a radioactive source turntable, a control motor, a turntable original point and a radioactive source bearing structure, and an output shaft of the control motor is fixedly connected with the end part of a central shaft of the radioactive source turntable; the radioactive source turntable is provided with a plurality of source positions, the radioactive source bearing structures are arranged in the source positions and are used for placing radioactive sources, and the turntable original point is used for calibrating and feeding back an initial position; the radioactive source shielding container is sleeved outside the radioactive source turntable and is used for shielding radioactive rays generated by a radioactive source in the radioactive source turntable; and the pneumatic transmission air inlet pipeline is positioned below the radioactive source turntable and is communicated with the radioactive source turntable.

The invention provides a preparation method of a deuterium-doped and carrier gas synergistic anti-radiation optical fiber, the optical fiber and application, and belongs to the technical field of anti-radiation optical fibers, the preparation method comprises the following steps: firstly, preparing an optical fiber preform with a fiber core doped with rare earth ions and OD groups by adopting an improved chemical vapor deposition and solution doping combined technology; drawing the optical fiber preform to prepare a double-cladding rare earth ion doped optical fiber; and finally carrying out carrier gas treatment on the double-clad rare earth ion doped optical fiber, the carrier gas being at least one of deuterium gas, hydrogen gas or oxygen gas, and obtaining the anti-radiation optical fiber. Through the synergistic effect of introduced OD groups and loaded gas molecules, the anti-radiation stability of the prepared anti-radiation optical fiber is jointly enhanced, after the finally prepared anti-radiation optical fiber is irradiated by gamma rays with the total dose of 200Gy (Si), the laser slope efficiency change at the 1080nm wave band is less than 5%, the radiation darkening effect is thoroughly inhibited, and the anti-radiation stability of the prepared anti-radiation optical fiber is improved. The problem that in the prior art, the anti-radiation performance is insufficient or cannot be maintained for a long time is solved.

The present application relates to a kind of semiconductor substrate regulation method based on gamma ray, belong to semiconductor processing technical field.The method includes: the detection parameter of the semiconductor substrate to be handled is obtained;Based on the detection parameter of semiconductor substrate and target resistivity, determine gamma ray irradiation parameter;The detection parameter of semiconductor substrate and gamma ray irradiation parameter are input to the defect state evaluation model that is constructed in advance, output defect concentration prediction value, and defect concentration prediction value is input to target optimization function and is calculated, determine vacuum annealing process parameter;Target optimization function is associated with target resistivity;Based on gamma ray irradiation parameter control gamma ray radiation source, semiconductor substrate is irradiated;Based on the vacuum annealing process parameter to the semiconductor substrate is carried out vacuum annealing treatment.By this way can significantly improve the precision and process robustness of irradiation and annealing synergic regulation, can improve the precision of regulation (such as resistivity precision and lattice integrity).