36results about How to "Good heredity" patented technology

The invention discloses a PCI optimization method in an LTE long-term evolution network and a system and relates to the mobile communication technology field. In an embodiment of the invention, a genetic algorithm is used to optimize a PCI distribution scheme; relative to a traditional optimization mode, in the genetic algorithm, evolution search calculating is performed from a string set; a coverage area is large, which is good for global prioritizing; PCI signal optimization analysis is accurate and reasonable; accurate and reasonable planning and adjustment can be performed on a wireless network signal and integral performance of an LTE wireless network is radically improved and increased. Crossover operation and mutation operation are firstly performed on an auxiliary synchronization signal SSS of each PCI group in a current candidate group. And then the crossover operation and the mutation operation are performed on a main synchronization signal PSS in each PCI group so that a condition that a same PSS is distributed in a same station during PCI distribution can be avoided and a severe same-mode interference condition of a model 3, a model 6 and the like can be greatly reduced.

The invention discloses a manufacturing method for the forged materials and rolled bar materials of a 1Cr15Ni36W3Ti alloy, for nuclear power, and aims at increasing the room-temperature strength and the high-temperature strength of the alloy. The following technical scheme is adopted: a non-vacuum induction and electroslag smelting method is adopted, and the strength of the alloy under room temperature and high temperature is increased through dispersion strengthening for carbides in the alloy; fine crystal gains can be obtained by controlling the heating temperatures of forging cogging, forging forming and rolling; the crystal gains can be recrystallized by controlling the temperatures of finish forging, forging forming and finish forging, and finish rolling; and the single-hammer reduction amount of a cogging process of a high-speed forging machine is controlled to be 60mm-80mm, the machining ratio reaches 3-5, and the total deformation amount of finish forging is controlled to be 30%-50%. Maintenance for the uniformity and consistency of the interior structure and performance of the alloy is benefited through the reasonable machining ratio and deformation amount, and the phenomena of coarse crystal grains and mixed crystals are effectively avoided. The manufacturing method disclosed by the invention has the following beneficial effects: the gaps of a production process for the 1Cr15Ni36W3Ti alloy in China are filled, the room-temperature and high-temperature performance of the alloy are improved, and the manufacturing method is successfully applied to manufacturing for nuclear power equipment in China.

The invention belongs to the field of machining and manufacturing of a dairy product, and relates to a preparation method of yogurt. A mixed fungicide is prepared from lactobacillus plantarum, lactobacillus bulgaricus and bifidobacterium animalis, wherein the mass ratio of the lactobacillus plantarum to the lactobacillus bulgaricus to the bifidobacterium animalis in the mixed fungicide is 1:(0.2-0.5):(0.1-0.2); the lactobacillus plantarum is Li-2013-01 with the preservation number being CGMCC No.7928. Cooperative fermentation of the yogurt is carried out by adopting the lactobacillus plantarum, streptococcus thermophilus and the lactobacillus bulgaricus, and the generated yogurt also has the characteristics of being high in viscosity, strong in water binding capacity and good in post-acidification.

The invention discloses a molecular marker and a screening method of gift strain nile tilapia oreochromis niloticus streptococcus iniae infection resistant family. The molecular marker is a sequence shown in SEQ ID NO.20; the screening method comprises five steps of streptococcus iniae infection, genome DNA extraction, primer screening, SRAP-PCR (Sequence-Related Amplified Polymorphism-Polymerase Chain Reaction) amplification and sequencing and analyzing, by the method, a parent family with stronger resistance to streptococcus iniae disease can be found more accurately and quickly, after enhanced cultivation, the parent family can be used as the parent for fingerlings propagation. The molecular marker screened out is prepared into a probe for detecting different parent families, the probe can sort out the streptococcus iniae disease resistant parent more simply and accurately, and selection of parent among different families is facilitated. Meanwhile, by using the bred disease-resistant parent as the propagation parent, quality of fingerlings can be improved further, and culture benefit of gift strain nile tilapia oreochromis niloticus can be increased.

The invention relates to a preparation method for a magnesium-based composite material, in particular to a preparation method for lost foam casting of a high-entropy alloy particle-reinforced magnesium-based composite material. The method aims to solve the technical problem that in the preparation process of an existing magnesium-based composite material, the addition proportion of magnesium alloywaste is small, and the strength is poor when a large amount of magnesium alloy waste is added. By adopting a lost foam casting method, utilizing two-way shear stirring, adding high-entropy alloy particles and performing ultrasonic treatment in the casting process, structure heredity is effectively improved, uneven dispersion of the particles at different positions of a magnesium alloy melt is avoided, structure coarsening is reduced, grain growth in the solidification process is inhibited, grains are refined, the utilization rate of magnesium alloy waste is increased, and the performance ofthe lost foam casting product is improved. In the method, the utilization rate of AZ91D waste is high, the maximum waste addition amount accounts for 34% of the total mass, raw materials are saved, and costs are reduced. The method is also suitable for continuous production operation and is an environment-friendly method.

The invention relates to a method of producing breeds of small stress-resistant spotted-brown chickens suitable for stewing; small spotted-brown chickens artificially cultivated used as first male parents of a complete set line and local yellow-feather chickens used as first female parents of the complete set line are subject to the production of F1 generation; hens which are 66 weeks old, lay more than 170 eggs and have yellow feather, feet and skin are selected from the F1 generation as breeds; hens which are 16 weeks old and weigh from 1100 g to 1300 g are selected as individual breeds; second female parents of the complete set line are formed under the breed retention rate of 60-70%; local spotted-feather chickens weighing within the average weight range +/-10% are selected as second male parents of the complete set line; the second male parts and the second female parents are hybridized to obtain F2 generation that is small stress-resistant spotted-brown chickens suitable for stewing. The spotted-brown chickens cultivated by the method have increased commercial uniformity and survival rate, have significant hybrid vigor; small stress-resistant spotted-brown chickens that are 18-20 weeks old can go to the market; the small stress-resistant spotted-brown chickens have much deposition of flavor substances, fat of the chickens is free of foul smell, and the chickens are most suitable for stewing.

The invention discloses a polygonatum sibiricum seedling raising method. The method comprises the following steps of seed collection and disinfection, sterile culture, seedling hardening and transplanting. According to the method, by adopting seeds of mature capsules for direct breeding and regulating the temperature, light, and humidity of a culture chamber, the seeds are induced for seedling raising through sterile culture, the cost is low, seedling raising is quick, the hereditary is good, the polygonatum sibiricum seedling raising efficiency is improved; after seedling hardening treatment,the survival rate of seedlings is increased, and the reproduction is vigorous.

The invention relates to a tissue culture method of corydalis pygmaea (an endangered Tibetan medicine). The tissue culture method comprises the following steps: sterilizing selected plant buds with ethanol and a HgCl2 solution successively, and then rinsing with sterile water to obtain sterile explants; and carrying out inoculation, shoot bud culture and induction, rooting culture, plantlet hardening and transplanting, and fixed planting on the sterile explants under aseptic conditions, so as to harvest corydalis pygmaea. The tissue culture method provided by the invention fills the blank of tissue culture technique of corydalis pygmaea, is not subject to seasonal restrictions and can be used to produce seedlings all the year round and realize artificial breeding. According to the tissue culture method, the top bud tissue of high-quality robust corydalis pygmaea is sterilized to obtain sterile tissue which is subject to segmentation and differentiation to obtain complete plants, whichhave low cost, can be bred fast, can adapt to high temperature difference, low temperature and strong ultraviolet ray of special environment in a plateau region, have a high seedling speed and good heredity, and can produce seedlings all the year round.