271 results about "Cold damage" patented technology

The invention relates to a device and a method for detecting cold damage of peach fruits based on reflection and semi-transmission hyperspectral images, belonging to the field of a non-destructive testing technology of quality of agricultural products. The method comprises the steps of: acquiring reflection and semi-transmission hyperspectral images of harvested peaches in different cold damage stages during low temperature storage through a hyperspectral imager, analyzing the difference between spectral values and images of peach fruits suffering from cold damage and normal peach fruits, extracting characteristic parameters of response, optimizing and determining a variable set of reflecting cold damage characteristics of the peach fruits, and establishing a mathematic model for judging the cold damage of the peach fruits based on a Fisher discrimination method, wherein the discrimination accuracies of the established detection models based on the reflection and semi-transmission hyperspectral images respectively reach 85.6 percent and 95.6 percent. The method is capable of accurately identifying the harvested peach fruits suffering from the cold damage instead of manual detection so that the loss of storage of the harvested fruits is reduced, and can be used for detection and monitoring in circulation, storage and marketing process of harvested fruits.

The invention discloses a whitewashing agent applied to the protection of tree trunks and application. The whitewashing agent comprises the following components in percentage by weight: 40 to 45 percent of calcined lime, 2 to 3 percent of lime sulfur mixture stock solution, 3 to 6 percent of lime sulfur mixture residues, 2 percent of salt, 0.5 percent of grease and the balance of water, wherein the lime sulfur mixture residues are a mixture which mainly contains silicon oxide. A preparation method for the whitewashing agent comprises the following steps of: adding the water and lime hydrate into a reaction kettle, and heating and stirring continuously for later use; putting the calcined lime into a hot-water boiler, and dissolving to prepare lime milk solution, putting sulfur powder which is blended to form paste in advance, stirring and mixing while adding the pasty sulfur powder for 40 to 60 minutes until liquid medicine has a rufous color, and the liquid surface has a layer of membrane, cooling the liquid medicine and collecting supernatant; and mixing the two liquid mixtures, heating, stirring and cooling to obtain the whitewashing agent. By applying the whitewashing agent, fruit tree barks can be prevented from being cracked, the resinosis can be avoided, the day-night temperature difference of branches can be reduced, and pathological changes caused by cold damage and insect attack can be prevented effectively, so the whitewashing agent can be used in various fields.

The invention discloses a breeding method of a polyclonal antibody cold-resistant two-line sterile line, belonging to the technical field of breeding for disease resistance. According to the breeding method, by using a two-line sterile line as a recurrent parent, and using a tryporyza incertulas-resistant variety, a rice blast-resistant variety, a stunt-resistant variety and a cold-resistant variety as antigen parents, through a hybrid polymerization process, antigen genes of four rice diseases, insect and cold damages are polymerized in the same rice material, and then subjected to multi-generation backcross and screening together with the recurrent parent of the two-line sterile line, so that the insect and cold-resistant two-line sterile line, with economical characters, sterility period translative temperature and sterility highly consistent with those of the recurrent parent of the two-line sterile line, is bred. The two-line sterile line is used for preparing two-line hybrid rice, and thus the level of resisting insects and low-temperature coldness of the hybrid rice can be improved.

The invention provides a juicy peach storage method, comprising the following steps: sorting and pre-cooling the fruits in a house at 20 degree after picking up the mature juicy peach fruits; low temperature processing the fruits using program cooling method; inducing the fruit tissue cold-damage endurance capability using a certain low temperature; storing the fruits at low temperature. The fruits are processed by suitable low temperature and then stored at low temperature, thus the fruit respiratory rate, fruit metabolism, fruit ripening process can be effectively decelerated and the energy consumption can be also reduced, the fruit storage time can be prolonged, at the same time the occurence of the cold-damage of the soft melting fruits during storage period and fruit decayed rate can be reduced and the storage fruit quality and marketability can be kept. The storage method has features of reasonable design, convenient operation, lower device requirement and less cost and is suitable for large-scale operation and demonstration and generalization. The storage method also can be applied for other climacteric, chilling-sensitive horticultural products.

The invention discloses a modified-atmosphere preservation method for bitter gourds. The method includes the following steps of raw material pretreatment, bagging, gas-filled packaging, sterilization and storage and transportation. By adopting a modified-atmosphere packaging technology and adjusting gas compositions in a packaging storage environment, growth and metabolism of microorganisms can be effectively restrained; meanwhile, by controlling temperature and improving a pretreatment and packaging process, cold damage, ethylene ripening and decaying of the bitter gourds are avoided. According to the modified-atmosphere packaging technology, the non-poisonous, non-harmful and no-residual effects are achieved, non-harmful treatment is adopted in the whole preservation process, the usage of poisonous chemical agents is avoided, and therefore no harmful influence on the bitter gourds exists. By means of the method, the defects of the prior art are overcome, the original freshness, color and luster and flavor of the bitter gourds can be kept, the shelf life of the bitter gourds can be prolonged, and the easily appearing problems that due to extremely low O2 concentration and extremely high CO2 content, the bitter gourds suffer oxygen deficit, and breathing disorders are caused in the modified-atmosphere preservation process of the bitter gourds can be solved.

The invention discloses a cold damage prevention refrigeration house, aiming to provide a refrigeration house which can reduce the cold damage caused by the greater temperature difference between the air blast temperature and the temperature in the refrigeration house so as to implement flow equalization in the refrigeration house. An air return jacket is formed between a refrigeration house body and an inner baffle plate; the upper end of the inner baffle plate is provided with an air blast plate; the bottom of the inner baffle plate is provided with a plurality of air return openings; a partition plate is arranged between the air blast plate and the top of the refrigeration house body; a mixed region is formed between the partition plate and the top of the refrigeration house body; a static pressure air blast region is formed between the partition plate and the air blast plate; the middle part of the partition plate is provided with an air blast fan; an air cooler is arranged at one side of the mixed region, and the other side of the mixed region is communicated with the air return jacket; the air return opening of the air cooler is communicated with the air return jacket; and the air blast opening of the air cooler is communicated with the mixed region. Part of the air passing through the air return opening passes through the air return opening of the air cooler and enters the air cooler, is discharged out from the air blast opening of the air cooler, and is mixed with the other part of return air which does not pass through the air cooler, and the mixed air is discharged into the refrigeration house through the static pressure air blast region, thus the temperature difference between the air blast temperature and the temperature in the refrigeration house is reduced, and the generation of cold damage is reduced.

The invention provides a heavy oil reservoir cold recovery method adopting carbon dioxide energy storage and high pressure viscosity reduction. The heavy oil reservoir cold recovery method comprises the steps that carbon dioxide is injected into a heavy oil reservoir to accumulate energy for a stratum and initial viscosity reduction is carried out to crude oil; and a high-efficiency cold-recoveryviscosity-reducing agent is used to achieve further viscosity reduction of heavy oil in a carbon dioxide low-temperature effect environment, interfacial tension is reduced, colloids and asphaltene precipitated from the heavy oil are dissolved, thus mobility of underground heavy oil is improved, driving power of the crude oil is increased, and the degree of exploitation of the heavy oil reservoir is improved. According to the heavy oil reservoir cold recovery method adopting carbon dioxide energy storage and high pressure viscosity reduction, the improvement of the reservoir energy of heavy oilreservoirs and the improvement of the flowability of underground crude oil are realized, and the cold damage effect caused by the precipitation of the colloids and the asphaltene by the low-temperature effect during the heavy oil cold recovery process is reduced, thereby greatly improving the degree of reserve utilization of the heavy oil reservoirs.

The invention relates to an alfalfa stress response gene MsNAC3 and an application thereof. A novel NAC (N-Acetyl Cysteine) family related gene is cloned and authenticated from an alfalfa genome by using an RT-PCR (Reverse Transcription-Polymerase Chain Reaction) technology and is named as MsNAC3 with a nucleotide sequence as shown in SEQ ID No.11, and a fusion expression vector containing an enhanced green fluorescent protein (EGFP) gene is constructed. The expression pattern of the gene MsNAC3 in alfalfa and the relation between the gene and adversity stress (cold damage, salt damage and drought) are analyzed by using a fluorescent quantitative PCR technology, in such a way, people find that the cold resistance, drought resistance and salt resistance of a transgenic tobacco plant can be improved through the overexpression of the gene in tobacco; the gene can be used for genetically transforming other monocotyledons and dicotyledons and improving the stress resistance of the monocotyledons and the dicotyledons.

A present totally-enclosed rotor type refrigerating compressor has two vicious cycles. The effects of a hot cylinder are as follows: a high-temperature motor rotor and compressing heat emission are accumulated at an air cylinder, expansion is caused after air suction and heating, the temperature of compressed exhaust air is increased, the power of a motor is increased, and the like. The cold damage is as follows: when a cold cylinder and an air suction pipeline are under high temperature and pressure, the compressed exhaust air is sucked into an air chamber for evaporation and heat absorption after condensing dilute lubricating oil, and the like. Therefore, only 50% of cold quantity can be obtained. The realizing steps of the compression cycle (virtuous) of the cold cylinder are as follows: 1. compression of the cold cylinder: the hot cylinder is cooled, eliminates compression and releases heat to reduce net compression work and condensation load; 2. air suction of the cold cylinder: the characteristic of low temperature of an air suction chamber is realized by continuous low-temperature air suction and low-temperature cooling of the hot cylinder so as to increase the cold quantity; 3. improvement of an oil channel: the air suction force is increased; 4. the overheating of the exhaust air and the heat emission of the motor are used for heating the lubricating oil with absorbing property, and an absorbent has low differential pressure and good absorbing property on the surface of the cooled air chamber, so as to further increase the cold quantity and reduce the net compression work. The efficiency is that the power of the motor is reduced by more than 30% and the cold quantity is increased by 2 times.

The invention discloses a hot air and MeJa compounded treatment refreshing method of a loquat fruit, which is specially used for protecting the picked loquat fruit from cold damage in the storage and transportation process and maintaining the quality to prolong the shelf life of the product. The technology comprises the following steps of: placing the sorted and pre-cooled loquat fruit into an airtight container with certain volume; and suffocating the loquat fruit with 15-20 micro-mol / LMeJA for 6 hours in 38 DEG C hot air. The compounded treatment refreshing method can obviously inhibit the picked loquat fruit from cold damage and quality deterioration, and the fruit subjected to the compounded treatment is not suffered from the cold damage after being stored for 35 days at 1 DEG C, while the contrast fruit which is not treated appears the obvious symptom of cold damage after being stored for 21 days. The hot air and MeJa compounded treatment refreshing method has the comprehensive advantages of separate heat treatment and separate MeJA treatment, and the used MeJA is a natural grown regulating substance in the plant, has the characteristics of no toxicity, no residues and the like, and can ensure the edible security of the fruit.

The invention discloses a digital constant-temperature control concrete ultra-low-temperature construction maintenance system, which comprises a sliding template, a data collecting device, a wireless transmission device and a heating control device, wherein a heat insulation shed is arranged on the outer periphery of the sliding template, a steel plate hanging frame is arranged at the lower part of the sliding template, four electronic heating quilts are suspended on the steel frame hanging frame, the four electronic heating quilts are surrounded into a barrel-shaped sealing head insulation cover, each electronic heating quilt is respectively and sequentially formed by connecting a high-intensity glass fiber layer, a heat tape and a heat insulation cotton layer from inside to outside, a plurality of temperature sensors are arranged on each electronic heating quilt, and all temperature sensors and heat tapes are respectively connected with the data collecting device, the wireless transmission device and the heating control device. Good heating and heat insulation effects can be realized, and the heat loss during the concrete casting can be effectively prevented. When the environment temperature is minus 30 DEG C, the temperature on the surface of the concrete can be enabled to be higher than 5 DEG C, so the cold damage and the crack occurrence on the surface of the concrete can be prevented, and the casting quality of bridge piers can be ensured.