Abstract: The present invention provides a red light emitting glass ceramic and a preparation method thereof, and an LED/LD light emitting device. A2Al4Si5O18:Eu2+ cordierite of the red light emitting glass ceramic capable of realizing blue light excited red light emission is a crystal phase material, wherein A is at least one of Mg, Ca, Sr, Ba and Zn and at least comprises Mg. The present invention particularly provides the red light emitting glass ceramic taking a chemical formula A2Al4Si5O18:Eu2+ as a crystal phase. The present invention further provides a preparation method of the transparent glass ceramic. The glass ceramic comprising the crystal phase, with the chemical formula of Mg2Al4Si5O18:Eu2+, is excited by blue light to emit red light, the internal/external quantum efficiencies reaching up to 94.5%/70.6%, respectively.

Abstract: Provided is a filling mining method for a fully-mechanized top coal caving working face, which relates to the field of mining engineering technologies. The method solves the technical problems of roof control of the fully-mechanized top coal caving working face and a large ground deformation of top coal caving mining.

Abstract: A coal measures fault formation simulation experimental device and a normal and reverse fault simulation experiment method relate to the field of similar material simulation experiment technology. The device includes a hydraulic lifting apparatus, a lower angle adjusting apparatus, a push rod apparatus, an upper loading apparatus, an upper angle adjusting apparatus, a lateral loading apparatus and a transparent side plate. The hydraulic lifting apparatus and the lower angle adjusting apparatus are below the experimental body, the upper loading apparatus and the upper angle adjusting apparatus are above the experimental body, the transparent side plate is disposed at a rear side surface of the experimental body, and the lateral loading apparatus is disposed at an end face of the experimental body.

Abstract: Provided are a normal fault simulation experiment device with an adjustable angle and an adjustable fracture initiation position and a method of using the same, which relate to the technical field of normal fault simulation experiments. The device includes a base, a column, a baffle plate, a hydraulic lifting apparatus, a lower angle adjusting apparatus, a push rod apparatus, an upper loading apparatus, an upper angle adjusting apparatus, a front baffle plate and a transparent side plate. The hydraulic lifting apparatus and the lower angle adjusting apparatus are disposed below an experimental body, the upper loading apparatus and the upper angle adjusting apparatus are disposed above the experimental body, the transparent side plate is disposed on a rear side surface of the experimental body, and a plurality of strip-shaped front baffle plates are disposed on a front side surface of the experimental body.

Abstract: Provided are a normal fault simulation experiment device with an adjustable angle and an adjustable fracture initiation position and a method of using the same, which relate to the technical field of normal fault simulation experiments. The device includes a base, a column, a baffle plate, a hydraulic lifting apparatus, a lower angle adjusting apparatus, a push rod apparatus, an upper loading apparatus, an upper angle adjusting apparatus, a front baffle plate and a transparent side plate. The hydraulic lifting apparatus and the lower angle adjusting apparatus are disposed below an experimental body, the upper loading apparatus and the upper angle adjusting apparatus are disposed above the experimental body, the transparent side plate is disposed on a rear side surface of the experimental body, and a plurality of strip-shaped front baffle plates are disposed on a front side surface of the experimental body.

Abstract: A coal measures fault formation simulation experimental device and a normal and reverse fault simulation experiment method relate to the field of similar material simulation experiment technology. The device includes a hydraulic lifting apparatus, a lower angle adjusting apparatus, a push rod apparatus, an upper loading apparatus, an upper angle adjusting apparatus, a lateral loading apparatus and a transparent side plate. The hydraulic lifting apparatus and the lower angle adjusting apparatus are below the experimental body, the upper loading apparatus and the upper angle adjusting apparatus are above the experimental body, the transparent side plate is disposed at a rear side surface of the experimental body, and the lateral loading apparatus is disposed at an end face of the experimental body.

Abstract: Provided is a filling mining method for a fully-mechanized top coal caving working face, which relates to the field of mining engineering technologies. The method solves the technical problems of roof control of the fully-mechanized top coal caving working face and a large ground deformation of top coal caving mining.

Abstract: A cycloheptane derivative as represented by formula (I), and preparation method and use thereof; the compound has photostability and thermostability, wide nematic phase and liquid crystalline state temperature range, and good low-temperature intersolubility, and particularly has low rotary viscosity ?1 and good dielectric anisotropy (??>0).

Abstract: Disclosed is a liquid crystal compound. The compound has a general structural formula as shown by formula I. Such a compound has good thermal and UV stability, large positive dielectric anisotropy ??, and can achieve a low threshold voltage when used in optics, thereby having great significance to the fast response of display devices, and therefore being very suitable for formulating a liquid crystal mixture. A liquid crystal mixture containing such a liquid crystal unit can be applied to various display devices, and is especially suitable for TN-TFT and STN display devices, but can also be used in IPS (in-plane switching) and VA (vertically aligned) display devices.

Abstract: A cycloheptane derivative as represented by formula (I), and preparation method and use thereof; the compound has photostability and thermostability, wide nematic phase and liquid crystalline state temperature range, and good low-temperature intersolubility, and particularly has low rotary viscosity ?1 and good dielectric anisotropy (??>0).

Abstract: Provided are a modified Na-montmorillonite and a preparation method thereof, wherein the content of Na+ in the modified sodium-montmorillonite, calculated as Na2O, is not less than 2.0%. The modified Na-montmorillonite has more reasonable microstructure, higher performance, and better quality. Also provided are a method for preparing a modified nanometered Na-montmorillonite from the modified Na-montmorillonite, and the modified nanometered Na-montmorillonite obtained by the method. Also provided are uses and a pharmaceutical composition of the modified Na-montmorillonite or modified nanometered Na-montmorillonite.

Abstract: Disclosed is a liquid crystal compound. The compound has a general structural formula as shown by formula I. Such a compound has good thermal and UV stability, large positive dielectric anisotropy ??, and can achieve a low threshold voltage when used in optics, thereby having great significance to the fast response of display devices, and therefore being very suitable for formulating a liquid crystal mixture. A liquid crystal mixture containing such a liquid crystal unit can be applied to various display devices, and is especially suitable for TN-TFT and STN display devices, but can also be used in IPS (in-plane switching) and VA (vertically aligned) display devices.

Abstract: Provided are a modified Na-montmorillonite and a preparation method thereof, wherein the content of Na+ in the modified sodium-montmorillonite, calculated as Na2O, is not less than 2.0%. The modified Na-montmorillonite has more reasonable microstructure, higher performance, and better quality. Also provided are a method for preparing a modified nanometered Na-montmorillonite from the modified Na-montmorillonite, and the modified nanometered Na-montmorillonite obtained by the method. Also provided are uses and a pharmaceutical composition of the modified Na-montmorillonite or modified nanometered Na-montmorillonite.