73 results about "Relative conductivity" patented technology

The invention relates to a method for directly producing high-purity oxygen-free copper by pyrogenic process continuous refining of scrap copper, and belongs to the technical field of non-ferrous metallurgy. The method comprises the following steps: by taking scrap copper as a raw material; analyzing the component characteristics of each batch of raw material, and then preparing into a mixture, wherein the mass percent of a copper element in the mixture is greater than or equal to 93%; adding metaphosphate or phosphorus pentoxide and flux to the mixture; refining by oxidation; stewing and drossing after oxidation is finished, and then orderly carrying out reduction refining and refining agent refining under an agitation state, so as to obtain the high-purity oxygen-free copper of which the copper content is greater than or equal to 99.95% and the oxygen content is smaller than 0.003%, wherein the electrical resistivity of the obtained copper wire after drawing is below 0.017241omega/(mm), and the relative electrical conductivity is over 100% of International annealed copper standard (IACS). The method is strong in flexibility, significant in refining effect, and applicable to different components of scrap copper materials; the scrap copper can be used for directly making a rod after being refined. Compared with the traditional pyrogenic process smelting-electrolytic refining-copper cathode purification process, the method disclosed by the invention has the beneficial effects that the flow is shortened, the cost is reduced, the energy is saved, and continuous operation is achieved.

The invention relates to normal position nm fiber enhancing Cu basal compounding material of Cu-Ag-RE alloy that has high strength and high conductivity. The material uses Cu as basal body, and contains Ag less than 15%, RE less than 0.1%. The best performance of the compounding material is that: UTS is over 1.5GPa, relative conductivity is over 60% IACS. The invention could be used as high strength and high conductivity conductor material.

The invention discloses a method for solution treatment and aging treatment which are matched with the processing of Cu-Ag alloy cold-finish drawing. A mixture with 7%-12% of Ag by weight and the rest of electrolytic Cu is melted in a vacuum induction furnace and carries out ingoting under the protection of Ar gas, the solution treatment and the aging treatment are carried out to the ingot, and the drawing deformation is carried out several times at the normal temperature. The fiber-phase composite strengthened Cu-(7-12)% Ag alloy obtained by matching the solution treatment and the aging treatment with the deformation processing has the strength of 380-1400MPa and the relative conductivity of (60-92)% IACS. The method simplified the technological process and the combination property of the alloy is close to or even exceeds the alloy with high Ag-content.

The invention provides a method for rapid identification of a heat-resistance seedling state of cotton, which comprises the following steps of: treating cotton seedlings at trefoil stage to quatrefoil stage for 5-12 hours at the temperature of 40-45 DEG C; setting comparison under normal growth condition; respectively determining ascorbic acid peroxidase activity, relative electric conductivity and seedling withering rate of treated cotton seedlings and normal growing cotton seedlings; calculating relative values of the ascorbic acid peroxidase activity, the relative electric conductivity and the seedling withering rate relative to those of the normal growing cotton seedlings; and determining heat resistance. The method can be used for effectively identifying the heat resistance of different cotton germplasm resources rapidly, and can provide appropriate parent materials for high-temperature resistant seed breeding.

The invention discloses a method for prolonging the refreshing time of yellow peach slices. The method comprises the following steps of: (1) preparing a film solution : dissolving chitosan into distilled water, stirring, then, adding glacial acetic acid to prepare a chitosan solution, stirring at the temperature of 18-22 DEG C, adding glycerol and Tween 80 into the chitosan solution and stirring, regulating the pH value to be 5.6 by using a NaOH water solution, and filtering to obtain the film solution; and (2) carrying out film coating treatment: immersing the slices into the film solution, and taking out the slices and draining. According to the method, the loss of vitamin C in the yellow peach slices can be effectively reduced, the increases of the activity of polyphenol oxidase and the relative conductivity are retarded, the browning is inhibited, and the loss of juice is reduced; and the shelf lives of the yellow peach slices are obviously prolonged, so that the yellow peach slices have excellent shelf quality.

The invention discloses a solid solution aging process whose cuprum-argent alloy hardness and conductivity are improved. Metal argent whose mass percentage is 5-7 percent and other burden which is electrolytic cuprum are melted in a vacuum induction furnace and are poured into ingots under the protection of argon gas, through the solid solution in 730 DEG C/8 hours and in 760-780 DEG C/4-8 hours and the aging of 350-450 DEG C/2-24 hours, the Vickers hardness of cast alloy is capable of being reached to 110-130 DEG C, and the relative conductivity is reached to 85-96 percent of International Annealed Copper Standard. The invention increases the alloy hardness and relative conductivity of casting cuprum-5-7 percent of argent through the solid solution aging, the process is simple, the performance level is higher than cuprum-24 percent of argent, and the cost of raw materials is reduced.

A sensor for detecting changes in electrical conductivity in a patient is disclosed. The sensor includes a transmit antenna that has an interior area bounded by a periphery. Importantly, the periphery includes an outer ring portion and an inner ring portion therein that partially surrounds an open area. Further, the sensor includes a receive antenna that has a substantially circular circumference that bounds an interior area. In order to balance the antennas, approximately half of the interior area of the receive antenna is superposed on the interior area of the second antenna. In operation, the antennas are positioned at a selected distance from one another near a patient. Then a signal is sent from the transmit antenna to the receive antenna. The signal is affected by the conductivity of the patient. As a result, the received signal may be monitored to detect electrical conductivity changes in the patient.

The invention relates to a high-temperature drought stress resistance agent and application of the agent and belongs to the field of crop planting. In order to overcome the technical defects that thestress resistance effect is poor by applying glycine betaine alone in the prior art and corresponding substitute products fall short in the market, the provided high-temperature drought stress resistance agent is prepared from glycine betaine, urea and Tween-20. When the agent is applied to annual seedlings or annual or biennial or triennial plants, drop of the chlorophyll content under an adversesituation can all be alleviated, and the photosynthetic capacity of leaves is improved. Accumulation of superoxide radicals (O2 -) in the leaves is reduced, the relative electrolytic leakage and membrane lipid peroxidation level of the leaves are lowered, plant resistance to drought and other stress is improved, and the agent is suitable for application and popularization in the agriculture.

The invention provides a method for fresh keeping of guava fruits by film coating with rhizoma kaempferiae essential oil, rhizoma alpiniae officinarum essential oil and fresh ginger essential oil. According to the method disclosed by the invention, various substances having antibacterial activity, such as the rhizoma kaempferiae essential oil, the rhizoma alpiniae officinarum essential oil, the fresh ginger essential oil, and chitosan are used as fresh keeping agents. The method comprises the following steps of selecting fruits, performing disinfection, performing air drying for the first time, performing film coating, performing air drying for the second time, and performing packaging. The substances having antibacterial activity, such as the rhizoma kaempferiae essential oil, the rhizoma alpiniae officinarum essential oil, the fresh ginger essential oil and the chitosan are merged, so that films compounded from the rhizoma kaempferiae essential oil, the rhizoma alpiniae officinarum essential oil, the fresh ginger essential oil and the chitosan have obvious fresh-keeping effects on storage of picked guava fruits, and changes of mouth feel and flavor of the picked guava fruits can be notably delayed. Respiration peak can be delayed, the increment of the content of propanedial can be notably restrained, and the rise of relative electrical conductivity and the rise of polyphenol oxidase activity can be notably restrained, so that the fresh-keeping time is greatly prolonged. The method is simple and convenient, materials are easy to obtain, the cost is low, and the method is easy to popularize.

The invention relates to a complete method for identifying and screening heat-resistant bottle gourd stocks, which belongs to the field of biology. Rapid screening of heat-resistant materials for variety breeding is based on establishment of a reliable heat resistance identification method. The natural field identification method is susceptible to environment and unable to accurately screen target materials. Therefore, inventing a complete method for rapidly and accurately identifying bottle gourd stock heat resistance by artificial stressing and statistical means is urgent. According to the technical scheme, the complete method includes: using bottle gourd high-temperature seeds to sprout and testing electric conductivity in the seedling stage; calculating identification indexes, namely relative germination rate (40-45 DEG C/30-35 DEG C), relative germination index (40-45 DEG C/30-35 DEG C) and relative electric conductivity (6h/0h); and identifying and screening the bottle gourd seeds by the clustering function of software SPSS13.0. The complete method is simpler in operation flow, consumes less time, is lower in cost, and can be used for identifying heat resistance of the bottle gourd stock material more quickly, more accurately and more conveniently.

The invention discloses a heat treating process of control the property matching of composite fiber reinforced Cu-Ag alloy, making vacuum melting, casting, at-702 deg.C/h homogenization treatment on the alloy in mass ratio of pure Ag to electrolytic Cu 12 : 88, making cold drawing to deformation degree eta = 5.1-7.0, and during cold-drawing, making at-400 deg.C/h, at-380 deg.C/h and at-360 deg.C/h middle heat treatment ateta = 1.3, 2.0 and 2.8, respectively, so as to obtain wire material with diameter 1.6-0.6 mm and prolonged fiberlike distributed tissue, and making the final heat treatment of preserving heat for 1 h at 20-60 deg.C. The invention can control tensile strength at 1040-220 MPa and relative electric conductivity in range of 73%-93% IACS, and enlarges the application range of the material; it is easy to implement; needs no fiberizing treatment course of material structureat extremely high deformation degree; in medium-Ag content alloy, it can make the property reach the level of higher-Ag content alloy.

The invention belongs to the technical field of agricultural production, and particularly relates to a cold-resistant agent for brassica rapa L. The cold-resistant agent for the brassica rapa L. seedlings is mainly characterized by comprising raw materials as follows: 15-25 mg/L of ABA (abscisic acid) and the balance of water, wherein the purity of the ABA (abscisic acid) is higher than or equal to 99.9%. The cold-resistant agent aims to solve the problem that the brassica rapa L. in the northern cold and arid regions is vulnerable to low-temperature freezing damage, growth of the overground part and the root system of the brassica rapa L. is promoted with chemical control means, especially the thickening growth of roots, the outstanding performance refers to increase of dry matter accumulation, and safe wintering of the brassica rapa L. is guaranteed; meanwhile, permeability (relative electrical conductivity) of leaf cell membranes as well as accumulation of membrane lipid peroxidation malonaldehyde can be reduced, so that the low-temperature freezing degree of leaves of the brassica rapa L. is reduced, the cold resistance of the brassica rapa L. is remarkably improved, and the cold-resistant agent has great practical significance on brassica rapa L. production.

The invention discloses protein related with the heat resistance of plants as well as an encoding gene and an application of the protein. The protein related with the heat resistance of the plants is the following (a) or (b): (a) protein consisting of amino acid sequences represented in sequence 1 in a sequence table; (b) protein formed by performing substitution and/or absence and/or addition of one or more amino acid residues on the amino acid sequences represented by the sequence 1, derived from the sequence 1 and related to the heat resistance of the plants. Experiments prove that after heat stress on transgenic plants, the content of malondialdehyde in plant blades and the relative electrical conductivity are obviously lower than those of receptor plants, which proves that the heat stability and the heat resistance of cell membranes of transgenic lines are enhanced. Thus it can be seen that the protein and the encoding gene of the protein have important theoretical and practical significance in cultivating wheat with enhanced heat resistance and other new varieties of plants and have wide application prospect.

The invention discloses a shielding structure of a radio frequency coil applied to a unilateral nuclear magnetic resonance sensor. The shielding structure comprises an aluminum casing used for accommodating a permanent magnet and a ferrite shielding board used for supporting the radio frequency coil, wherein the ferrite shielding board is arranged at an outer surface of one side of the aluminum casing and is between the aluminum casing and the radio frequency coil, the ferrite shielding board comprises a ferrite plate and a shielding layer formed by splicing multiple ferrite blocks, the adjacent ferrite blocks have gaps, the ferrite plate and the aluminum casing are oppositely arranged, and the shielding layer and the radio frequency coil are oppositely arranged. As the ferrite shielding board has relatively large magnetic conductivity and relatively small relative electrolytic leakage, so a radio frequency magnetic field generated by the radio frequency coil can be prevented from inducting relatively large vortex in the ferrite shielding board, a radio frequency magnetic field of the radio frequency coil at the aluminum casing side can be shielded by the shielding structure, so single-side shielding is realized, inducting the relatively large vortex in the aluminum casing can be prevented, and a magnetic field in a target area can be further enhanced. The invention further discloses the unilateral nuclear magnetic resonance sensor.

The invention discloses an experimental method for influence of external applying of spermidine to blueberry drought resistance. The method comprises the following steps of material preparation, setting treatment, content and parameter measurement and data analysis. The experimental method for the influence of external applying of spermidine to the blueberry drought resistance provided by the invention is implemented by setting three different experimental drought conditions (normal moisture, medium drought and heavy drought) and treating under experimental conditions of spraying and not spraying the spermidine; the result shows that by means of spraying the spermidine under the same stress condition, the photosynthetic rate of blueberry in a drought condition can be enhanced, the activity of antioxidase in a plant body is improved, the content of malondialdehyde (MDA) is reduced, the accumulation of soluble sugar content in a plant cell is reduced, the IAA (auxin) content and the ABA (Abscisic acid) content are reduced through inducement, and the GA (Gibberellic Acid) content and in-vivo polyamine content are increased; in addition, obvious effects of improving the leaf relative water content, specific leaf weight and relative electrical conductivity of the blueberry under the drought condition are achieved by means of spraying the spermidine, so that a scientific evidence is provided for the drought resistance research of the blueberry.

The invention discloses a method for rapidly detecting the vitality of tobacco seeds. The method comprises the steps of: taking tobacco seeds to be detected, performing cleaning, adjusting the water content of the tobacco seeds to 15-25%, balancing the water content, and performing water bath for 24 hours at 45 DEG C to obtain seeds subjected to deterioration control treatment; taking the seeds subjected to deterioration control treatment, adding the seeds into deionized water with the water temperature of 20-25 DEG C for soaking for 6-54 h, and determining the absolute conductivity of the soaking solution; then placing the tobacco seeds in deionized water, heating the tobacco seeds to 100 DEG C for boiling for 10-20 min, taking out the tobacco seeds, cooling the tobacco seeds to a room temperature, and determining the total conductivity of the tobacco seeds; and calculating the relative conductivity of the tobacco seeds by taking the conductivity of the deionized water as a contrast conductivity to reflect the activity of the tobacco seeds. The method combines a deterioration control method and a conductivity method, so that the detection time is greatly saved, and the detection accuracy is ensured.

The invention discloses a method for evaluating lily cold resistance and screening winter-resisting variety and an application and belongs to an agricultural efficient production technology. The method comprises the following steps: by taking the first mature leaf of the second round below the growth point of the lily plant as a raw material, cutting the mature leaf into the leaf blocks in certain size and pre-treating the leaf blocks; utilizing a low-temperature circulating instrument to treat the leaf blocks and then measuring the relative conductivity; and lastly, utilizing statistical software to calculate lethal dose-50 temperature (LT50) of various lily varieties, evaluating the cold resistance of the lily varieties according to the lethal dose-50 temperature and screening the winter-resisting variety of lily. Compared with the traditional method for evaluating the cold resistance by taking lily seed ball or tissue culture seedling as a raw material, the method has the advantages that the evaluation result of the cold resistance of lily can reflect the practical cold resistance of lily in the field and the method is more representative than the traditional method.

The invention discloses a method for screening cold-resistant cotton varieties and application thereof. The method comprises the following steps of (1) seeding cotton seeds of different varieties; after the seeding for two days, realizing young seedling emergence; removing young seedlings with nonuniform growth conditions in the fourth day; maintaining the continuous growth of other young seedlings; (2) realizing flat spreading of cotyledons after the young seedlings grow to the seventh day; performing cold adaptation on the young seedlings; then, performing cold treatment; next, performing hot adaptation and restoration treatment; counting the survival rate and counting the cotyledon cold damage level; next, calculating the form index; testing the relative electrical conductivity of detached leaves when the cold treatment is performed for 72 hours; and evaluating the cold resistance according to the form index or the relative electrical conductivity.

The invention discloses a Europe and America hybrid grape variety Kyoho stress-resistant gene VlbZIP36 and an application thereof. The disclosed gene complete open reading frame sequence is 969 bp, and 322 amino acids are encoded. Transgenic arabidopsis thaliana with overexpression of VlbZIP36 is found out to show enhanced resistance to drought stress in a seed germination stage, a seedling stage and a mature stage, and moreover, the resistance is related with changes of relative conductivity and malonaldehyde and expression enhancement of stress related genes. With use of the VlbZIP36 gene, water loss is restricted, the activity of antioxidase is regulated to remove ROS, the expression level of the related target gene is transcribed and regulated, and the VlbZIP36 gene plays a role in enhancing drought stress resistance in transgenic arabidopsis thaliana. The application disclosed by the invention is an application of the gene VlbZIP36 in improving the ability of plants to resist drought stress.

The invention explores the effect of rhamnolipid on the alleviation of zoysia japonica salt stress through studying the change in the relative growth rate, the relative moisture content, the relativeconductivity and the malondialdehyde (MDA) content of zoysia japonica in the salt stress process and after the use of the rhamnolipid and discovers that the rhamnolipid can obviously improve the relative moisture content and the relative growth rate of the zoysia japonica in the salt stress process and reduce the relative conductivity and the malondialdehyde (MDA) content of the zoysia japonica, so that the harms of the salt stress to the zoysia japonica are relieved, therefore, a new method is provided for the alleviation of the salt stress of the zoysia japonica in saline-alkali soil; the optimal concentration of a rhamnolipid solution is 0.5 g/L.

The invention relates to an electronic nose sampling data pre-calibration method based on a response curve differential characteristic. The method is suitable for adopting an electronic nose bionic sampling mode with a complete cycle in three cycles. The method comprises the steps that array sampling data acquired in an electronic nose bionic sampling manner are preprocessed in turn, and St is set as normalized relative conductivity change rate; St is differentiated through a sampling gradient method; the maximum of three ascending differential curves and the maximum of three descending differential curves of each sensor curve are extracted; the absolute value of three mean differentials of each sensor differential curve in a time period above a coordinate axis and the absolute value of three mean differentials in a time period above the coordinate axis are respectively calculated; the acquired maximum of the differential curve of each sensor is compared and judged; the acquired average differential of each sensor is compared and judged; and when the differential extremum and the mean differential meet the differential characteristic of bionic breath sampling, the sampling data of a sensor is accurately pre-calibrated.