9results about How to "Be selective" patented technology

The utility model provides a planting greenhouse with a photovoltaic panel array, which comprises the photovoltaic panel array, the photovoltaic panel array is arranged between two adjacent peak-shaped steel frames, two sides of the top of each peak-shaped steel frame are provided with reflectors, and the reflectors face the photovoltaic panel array between the two adjacent peak-shaped steel frames; shade-loving plants are planted below the photovoltaic panel array; the peak-shaped steel frame serves as a planting greenhouse. Reflecting plates are arranged on the left side and the right side of the photovoltaic panel array, light rays irradiated by different solar altitude angles can be reflected back to a photovoltaic assembly to improve the reflection quantity adapting to different solar altitude angles in four seasons of spring, summer, autumn and winter, meanwhile, the reflecting plates can resist higher wind speed, and the capacity of adapting to severe weather is improved. The planting greenhouse is arranged below the reflecting plate, the top of the planting greenhouse is made of light-transmitting materials with special selectivity, refracted light can be utilized for photosynthesis of plants, a relatively closed inner space is formed, growth and development of the plants are facilitated, and output is increased.

The invention belongs to the technical field of medicine preparation, and particularly relates to a synthesis method and an intermediate of rosmeltirol. The method comprises the following steps: (1) mixing SM1, organic monobasic acid and inorganic acid in proportion, stirring and dissolving, dropwise adding a sodium salt solution, and then adding SM2 and a carboxylate solution for reaction to prepare an intermediate 1; (2) dissolving the intermediate 1 in an amide compound, adding potassium salt, heating for reaction, and purifying to obtain an intermediate 2; (3) dissolving the intermediate 2 in aromatic hydrocarbon, adding boride, and performing deprotection and purification to obtain an intermediate 3; and (4) dissolving the intermediate 3 in an organic sulfide, then adding SM3 and inorganic salt, and carrying out heating reaction and purification to obtain the rosimeltirome. The method provided by the invention has the characteristics of concise, efficient and safe synthesis of the rosmeltirol, reduces by-products, is helpful for improving the purity and stability of the product, avoids the use of expensive Grignard reagent and complex purification steps, and is more suitable for large-scale industrial production.

The present application relates to power distribution system technical field, especially to distributed intelligent power distribution network self-healing control method and system.The method comprises the following steps: step S1, real-time collection of distributed intelligent power distribution network operation data; step S2, fault detection; step S3, parallel protection control; step S4, building fault section positioning model and island division model, and positioning fault section according to fault section positioning model, and dividing island according to island division model; step S5, building double-target optimization model; step S6, solving double-target optimization model according to improved ant colony algorithm, and obtaining optimal switch action table; step S7, safety check of optimal switch action table, and self-healing control of distributed intelligent power distribution network according to safety check result; step S8, feedback of self-healing control situation of distributed intelligent power distribution network.The present application improves fault recovery speed, accuracy and reliability of distributed intelligent power distribution network.

This invention discloses a terahertz filter, relating to the field of filter technology, comprising: a flange with four symmetrically arranged metal resonant cavities along its cross-section, each adjacent metal resonant cavity having a coupling structure; two standard waveguide transition structures, each including a transition structure and a transmission structure, the transition structure including a transition block and a reverse step structure on one side thereon, and the transmission structure including a transmission block on the other side of the transition block; and two gaskets disposed on both sides of the flange, each gasket having a gap waveguide structure in its center, the gap waveguide structure including a bed of nails structure and an impedance transformation structure. This invention integrates traditional waveguide design methods into the flange, achieving excellent electrical performance with low loss and high selectivity in a compact size. The designed gap waveguide structure further improves the performance of this filter.

The application discloses a kind of di (propyl-2-alkenyl) furan-2, 5-dicarboxylic acid ester and preparation method thereof, it is related to biomass-based organic synthesis method technical field.The method with 2, 5-furan dicarboxylic acid as base material, by esterification reaction under the action of inorganic metal catalyst, will be grafted in 2, 5-furan dicarboxylic acid on allyl, obtains di (propyl-2-alkenyl) furan-2, 5-dicarboxylic acid ester.Compared with traditional synthesis method, the required reaction condition is relatively mild, without high temperature and high pressure environment, not only reduce energy consumption, also reduce operating risk and equipment cost.Mild reaction condition is also more conducive to keeping the activity and selectivity of catalyst, improves reaction efficiency.The obtained product is high in purity, without complex post-processing step can be directly used in subsequent application or further chemical conversion, improves overall production efficiency.The application provides a new idea for 2, 5-furan dicarboxylic acid and other biomass materials to realize high value-added utilization.

The present invention discloses a (Z)-nitrogen heterocyclic alkenyl chloride compound and a preparation method and application thereof. The structural formula of the compound is any one of #imgabs0#; wherein R 1 is at least one of a hydrogen atom, an alkyl substituent and an aryl substituent; R 2 is at least one of a hydrogen atom, an alkyl substituent, an aryl substituent, an allyl group, and a propargyl group; n1 is an integer of 1 to 5, and n2 is an integer of 1 to 5. The preparation method of the (Z)-nitrogen heterocyclic alkenyl chloride compound of the present invention adopts a simple non-toxic metal iron salt catalyst and a simple Cl ‑ Reagents, water or heavy water are green, efficient, and easy to mass produce. The obtained compound is a product with a single Z-form structure and can be used for the development of heterocyclic drug molecules.

The invention provides a chemical and biological enzyme combined degumming method for apocynum venetum fibers, which comprises the following steps: adding apocynum venetum treated by organic acid into an immobilized enzyme gel treatment solution, and finally adding the apocynum venetum into an oxidant treatment solution to obtain the apocynum venetum fibers. The immobilized enzyme gel treatment liquid can be recycled, the weight loss rate of the prepared apocynum venetum fiber is about 50%, the residual gum rate is about 3%, the whiteness is about 80%, the degumming effect is guaranteed, meanwhile, the concentration of the used alkali liquor is reduced, and the problems that a traditional chemical degumming method is large in alkali consumption and serious in environmental pollution are solved.

The invention relates to a three-dimensional Ni-Al LDHs nanoflower composite material as well as a preparation method and application thereof, and belongs to the technical field of gas sensitive materials. In order to solve the problems of high working temperature, low sensitivity, long response / recovery time and high cost of Ni-Al LDHs as a gas sensitive material, the invention provides a three-dimensional Ni-Al LDHs nanoflower composite material which is prepared by doping g-C3N4 and has a microstructure consisting of a plurality of lamellar structures. According to the invention, g-C3N4 is used as a dopant to cause structural distortion, and abundant pores and channels among a plurality of obtained lamellar structures form a humidity shielding effect, so that the composite material can maintain sensitivity and selectivity to target gas in a high-humidity environment. The lamellar structure is not easy to collapse or deform in a humidity environment, the stability of the structure and the performance of the lamellar structure is maintained, the performance of the gas sensitive sensor in the humidity environment can be remarkably improved, and the lamellar structure has important application prospects in the field of NO2 gas detection.

The application discloses a kind of thin film nitric oxide sensor and preparation method, preparation method includes: water-soluble zinc salt is mixed with water and is obtained A solution;2-methylimidazole, CTAB and water are mixed and obtained B solution;A solution and B solution are mixed and obtained reaction liquid, MOFs material is obtained by hydrothermal reaction;In reaction liquid, the mass fraction of CTAB is 0.01-0.1%;MOFs material is calcined and obtained zinc oxide nanomaterial, is dissolved in terpineol, after stirring, obtained slurry, add to silicon piece, then carry out glue, after glue, dry, anneal and obtain annealing device;Annealing device is welded, packaged and obtained the thin film nitric oxide sensor in the present application Surfactant (CTAB) is used to control the shape and size of MOFs particle, so that gas sensor has high sensitivity and selectivity;Meanwhile, the working temperature of the gas sensitive material is low, and the energy consumption is also low, which can be used for nitric oxide gas detection.