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40 results about "Group property" patented technology

A group property is something that every group either satisfies or does not satisfy. Group properties must satisfy the condition of isomorphism invariance: if G 1 {\displaystyle G_{1}} and G 2 {\displaystyle G_{2}} are two isomorphic groups, they either both have the property or both do not have the property.

Screening grouping method of echelon utilization type lithium batteries

ActiveCN103785629AImprove group consistencyGuaranteed Capacity UtilizationSortingPower batteryBattery degradation
The invention relates to a screening grouping method of echelon utilization type lithium batteries, and belongs to the technical field of determination of parameters of the lithium batteries. According to the technical scheme, the screening grouping method of the echelon utilization type lithium batteries comprises the following steps: testing and calculating so as to obtain a battery dQ/dV-V curve, analyzing ageing reasons of return power batteries by adopting an ICA (Incremental Capacity Analysis) method, and firstly rejecting the return power batteries, negative active materials of which are lost; testing to obtain the capacities, ohmic internal resistance, polarization internal resistancs and self-discharge values of the echelon utilization type lithium batteries, and screening the batteries according to indexes; and regrouping the screened batteries. The screening grouping method of the echelon utilization type lithium batteries has the beneficial effects that serious declining batteries are rejected by screening the echelon utilization type lithium batteries so as to ensure that the echelon utilization grouping property of the batteries is not affected by individual damaged battery; the batteries which are similar in terms of capacity, ohmic internal resistance and polarization internal resistance are clustered together by using a weighting k-means clustering method, and due to the setting of weights, the capacity utilization rate of a battery group is ensured; the forming consistency of the echelon utilization type lithium batteries can be improved, and the service life of the echelon utilization type lithium batteries is prolonged.
Owner:STATE GRID CORP OF CHINA +1

Seed selection method of high stigma exsertion rate japonica two-line sterile line

A seed selection method of a high stigma exsertion rate japonica two-line sterile line belongs to the fields of two-line hybrid japonica rice genetic breeding and seed production. The method comprises the following steps: 1 choosing a two-line sterile line with a high stigma exsertion rate as a donor parent; 2, hybridizing the donor parent with a japonica two-line sterile line; 3, selecting individual plants with the stigma exsertion rate reaching above 95% from the above obtained F2 generation; 4, selecting materials with high stigma exsertion rate and stable and consistent group properties from the above obtained F3 to F7 generations; 5, carrying out high stigma exsertion rate gene positioning on the obtained materials, and selecting low initial temperature materials by using a greenhouse; 6, hybridizing the materials obtained in step 5 with conventional japonica rice, backcrossing the F2, selecting thoroughly abortive individual plants from BC1F2, cutting spikes, and collecting seeds; 7, continuously inbreeding the obtained materials in Hainan to F4, experimentally planting the BC1F5 in different latitude regions, selecting temperature and light-insensitive sterile individual plants, cutting spikes, and collecting seeds; and 8, carrying out stigma exsertion gene detection on the obtained materials, and finally screening a two-line sterile line material with a high stigma exsertion rate. The method can significantly improve the breeding efficiency and the seed yield.
Owner:天津天隆科技股份有限公司

A kind of step-by-step lithium battery screening group method

ActiveCN103785629BImprove group consistencyGuaranteed Capacity UtilizationSortingPower batteryElectrical battery
The invention relates to a screening grouping method of echelon utilization type lithium batteries, and belongs to the technical field of determination of parameters of the lithium batteries. According to the technical scheme, the screening grouping method of the echelon utilization type lithium batteries comprises the following steps: testing and calculating so as to obtain a battery dQ / dV-V curve, analyzing ageing reasons of return power batteries by adopting an ICA (Incremental Capacity Analysis) method, and firstly rejecting the return power batteries, negative active materials of which are lost; testing to obtain the capacities, ohmic internal resistance, polarization internal resistancs and self-discharge values of the echelon utilization type lithium batteries, and screening the batteries according to indexes; and regrouping the screened batteries. The screening grouping method of the echelon utilization type lithium batteries has the beneficial effects that serious declining batteries are rejected by screening the echelon utilization type lithium batteries so as to ensure that the echelon utilization grouping property of the batteries is not affected by individual damaged battery; the batteries which are similar in terms of capacity, ohmic internal resistance and polarization internal resistance are clustered together by using a weighting k-means clustering method, and due to the setting of weights, the capacity utilization rate of a battery group is ensured; the forming consistency of the echelon utilization type lithium batteries can be improved, and the service life of the echelon utilization type lithium batteries is prolonged.
Owner:STATE GRID CORP OF CHINA +1
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