45results about How to "With quantum size effect" patented technology

There is provided a semiconductor laser element, which has a small capacitance outside a ridge portion and high response speed and is able to effect pulse oscillation with a satisfactory pulse waveform. On a GaAs substrate 101, there are provided an n-type buffer layer 102, an n-type first clad layer 103, an MQW active layer 104, a p-type second clad layer 105, a p-type etching stop layer 106 that has an energy bandgap smaller than that of this second clad layer 105, a p-type third clad layer 107 that constitutes a ridge portion and a p-type protective layer 108. On both sides in the widthwise direction of the ridge portion are laminated a p-type spacer layer 109, an n-type current light confining layer 110, an n-type current confining layer 111 and a p-type flattening layer 112. On these layers is laminated a p-type contact layer 113. A depletion layer spreads into the spacer layer 109 when a bias voltage is applied. Therefore, a capacitance between the spacer layer 109 and the current light confining layer 110 is reduced, and a response speed during the pulse oscillation of the semiconductor laser element becomes fast.

The invention discloses environmental protection anti-corrosive antistatic coating, the environmental protection anti-corrosive antistatic coating is characterized in that the coating is composed of a first component and a second component, according to the weight parts, the first component accounts for 500 parts to 1500 parts, and the second component accounts for 150 parts to 500 parts; according to the weight percentage, the first component comprises resin accounting for 20 percent to 50 percent, conductive filler accounting for 10 percent to 40 percent and filler accounting for 15 percentto 35 percent; the surplus is the solvent; the second component is a solidifying system. The coating of the invention is the coating layer structure formed through a reaction, the coating layer structure is an interpenetrating network structure of high molecular polymer, and the interpenetrating network structure is a spatial and multidimensional structure, wherein, each crosslinking point of thestructure is a linkage of a polar group, simultaneously, each crosslinking point is dispersed between the interpenetrating network structure of high molecular polymer and applied with the nanometer filler and the anti-corrosive filler linked with the crosslinking point, to ensure that the firm system structure has high compactness and resistance to wear, and the coating has super resistance to penetration and corrosion resistance.

The invention belongs to the field of synthesis and application of functional nanomaterials, and in particular relates to a preparation method and optical application of a novel near-infrared mercury chalcogenide fluorescent quantum dot. The novel HgTe / ZnSe fluorescent nanocrystal synthesized by the invention has the following general formula: The glutathione-coordinated HgTe / ZnSe core-shell quantum dots of the present invention have stable near-infrared fluorescence emission and good biocompatibility, the fluorescence emission has stable optical properties, adjustable emission wavelength, high quantum yield and low toxicity It is suitable for the preparation of near-infrared optoelectronic devices and the fluorescence imaging of deep tissue in animals.

The invention relates to a modified high belite cement and a method for improving the early strength of the high belite cement, aiming at solving the technical problem of low early strength of the existing high belite cement. The present invention is to add nano indium oxide to high belite cement according to the mass ratio of high belite cement:nano indium oxide=9~4999:1 and mix evenly, the added nano indium oxide can excite C 2 The activity of S in the early stage can accelerate the hydration rate, generate more gels, regulate the crystal form of hydration products, and improve the early strength of high belite cement. The invention not only effectively solves the problem of high energy consumption in the cement industry, but also provides a simple and easy method for improving the early strength of high belite cement, which has low production cost and is easy to popularize.