Semiconductor laser chip convenient for cleavage strip arrangement and manufacturing method thereof

The invention relates to a semiconductor laser chip convenient for cleavage strip arrangement and a manufacturing method thereof. The chip comprises an epitaxial wafer, bars and filler strips are arranged on the P surface of the epitaxial wafer, the bars and the filler strips are alternately distributed at intervals, and cleavage windows are formed between the bars and the filler strips; a tube core structure is arranged on the bar; a bar region and a filler strip region are arranged on the N surface of the epitaxial wafer, and the positions of the bar region and the filler strip region correspond to the positions of the bars and the filler strips on the P surface. The chip structure is characterized in that the bars and the filler strips are periodically distributed at intervals, and during cleavage operation, the bars and the filler strips can be cleaved in sequence at a time. When the strips are manually placed, the strips and the filler strips are sequentially arranged on the film coating ...

Itaconic acid-based self-repairing polyurethane containing dynamic disulfide bonds as well as preparation method and application of itaconic acid-based self-repairing polyurethane

The invention provides itaconic acid-based self-repairing polyurethane containing dynamic disulfide bonds, which is characterized in that itaconic acid is used as a bio-based raw material, and the itaconic acid-based self-repairing polyurethane material containing dynamic disulfide bonds is obtained through esterification reaction, sulfydryl-alkene click reaction and polymerization reaction in sequence. By adopting the technical scheme provided by the invention, three hydroxyl groups are respectively introduced to two ends and a side chain of itaconic acid by utilizing a conjugated structure of carboxyl of itaconic acid and double bonds, and then the itaconic acid reacts with isocyanate and an amino compound containing disulfide bonds to form a cross-linked compound with a three-dimensional network structure; meanwhile, a disulfide bond with high exchange activity is introduced into a network structure, so that self-healing at a relatively low temperature can be realized, and the polyurethane ...

Apparatus for producing pressure by using temperature caused expansion and contraction

Million-times hot and cold impact resistance thermoelectricity semiconductor refrigeration/heating device and manufacturing method thereof

The invention relates to a million-times hot and cold impact resistance thermoelectricity semiconductor refrigeration/heating device and a manufacturing method thereof. The device comprises a refrigeration/heating light ceramic substrate (1), a heat conducting medium (2), a metal diversion strip (3), P/N type thermopiles (4) and an insulation substrate (5) formed by another metal diversion strip and another ceramic substrate through traditional sintering. According to the device, the ceramic substrate is enabled to have small deformation in a use process of the device because of the diversion strip and the ceramic substrate at refrigeration/heating ends of a flexible connector, and thereby parallelism of the two faces of the device is guaranteed, and great reduction of correlation between each pair of P/N type thermopiles is realized; the heat conducting medium for flexible connection of the metal diversion strip and the ceramic substrate at the refrigeration/heating faces has relatively ...

Extraction cauldron

The utility model discloses an extraction cauldron, including the cauldron body, internal portion is equipped with the rabbling mechanism at the cauldron, is equipped with sealed lid at the top of the cauldron body, is equipped with feed inlet, extractant feed inlet and atmospheric valve sealed covering, be equipped with the branch pipe that is used for observing extract layering performance in one side of the cauldron body, be equipped with the discharge gate in the bottom of the cauldron body, be equipped with the sight glass below the discharge gate. The beneficial effects of the utility model are that: observing the layering definition of extract and then judging whether successful the single extraction is through the branch pipe, this intensity of labour who has not only lightened the staff has also shortened the time that the single extracted simultaneously, and the staff need not rule of thumb to come to confirm the extraction time again, extracts several backs and observes can be ...

Cuprous selenide nano material and preparation method thereof

The invention provides a cuprous selenide nano material and a preparation method thereof, and belongs to the field of nano material preparation. The preparation method comprises the following steps: adding a Cu source, a Se source, alkali and a reducing agent into a solvent to obtain a mixture; carrying out stirring and heating reaction on the obtained mixture to generate a cuprous selenide nano material; after the reaction is completed, cooling to room temperature, and then centrifuging, washing and drying to prepare the cuprous selenide nano material with a sheet structure; wherein the alkali is one of lithium hydroxide or lithium hydroxide dehydrate. According to the preparation method, lithium hydroxide or lithium hydroxide dehydrate is adopted to replace traditional sodium hydroxide and potassium hydroxide to serve as alkaline regulators, the cuprous selenide nano material which is of a sheet structure and is concentrated in particle size distribution and good in uniformity is successfully ...