52results about How to "Negligible cost" patented technology

The invention discloses a method for extracting and purifying microcystin, in particular a method for extracting high-purity microcystin MC-RR and MC-LR from a raw material of dried powder of bloom cyanobacteria harvested in the field. The method comprises the following steps of: A, crudely extracting the microcystin MC-RR and MC-LR by using methanol; B, making the crude extracting solution pass through an ODS column to finely extract the microcystin MC-RR and MC-LR; C, separating the microcystin MC-RR from MC-LR by using a semi-preparative chromatograph; and D, saving the microcystin MC-RR and MC-LR. The method for extracting and purifying the microcystin has the advantages of wide sources of raw materials, low cost, simple operating process, purity of over 97 percent of the extracted microcystin, and capacity of meeting the requirement on toxin purity for scientific research.

The invention discloses a seam structure of a prefabricated sectional type concrete bridge and belongs to the field of bridge engineering. On the basis that a conventionally-used formwork is basically not changed, protruding blocks and corresponding grooves are prefabricated at the two ends of each section, and hole channels of connecting reinforcing steel bars are reserved in each protruding block. After the sections are spliced, the connecting reinforcing steel bars penetrate into the reserved hole channels and anchored. The section connecting portions are squeezed tightly, a seam between the prefabricated sections is high in shearing strength, the bending performance of a bridge body is enhanced, and cracking of the bottom of the seam is delayed. Even though a crack appears, the crack can be effectively prevented from being expanded through the connecting reinforcing steel bars, and therefore the bearing capacity of the bridge body is improved. Compared with the prior art, the structure is convenient to construct, the integrality of the bridge established through the structure is good, and the mechanical property of the seam is greatly improved.

The invention claims a multifunctional circulating packaging box which is provided with a RFID identification card and is capable of overcoming such disadvantages of RF cards in the prior art that the price is high, the identification rate is low and wide use in the storage physical distribution management is not possible. The multifunctional circulating packaging box adopts the technical proposal that: the circulating packaging box comprises a top cover, a front panel, a back panel, two side plate composite members and a base board, wherein, the two side plate composite members comprise at least one intermediate plate and side plates symmetrically arranged on two sides of the intermediate plate. The circulating packaging box is characterized in that the front panel is inserted with a passive tag, or / and the side plates are provided with at least one of active tag or semi-passive tag. The application of the circulating packaging box in the storage physical distribution management on one hand saves the operation cost for manufacturers, importers and vendors, and on the other hand improves the efficiency of goods counting and the accuracy of the identification, thus greatly improving the intelligent management level of physical distribution, storage and relative trades.