Abstract: Provided is a non-spherical colloidal silica, a preparation method and use thereof. The non-spherical colloidal silica has a particle size of 35-150 nm and an aspect ratio of 1.5-2.5. The preparation method includes: 1) adding a first mixture including a first organic solvent, a base, and water to a second mixture including an alkoxysilane and a second organic solvent to react to obtain non-spherical silica nuclei; 2) using the non-spherical silica nuclei as a primary mother liquor, adding water, a base, and alkoxysilane in at least one step to perform at least one step of particle growth, obtaining an organic solution of non-spherical colloidal silica; 3) replacing the organic solvent in the organic solution of non-spherical colloidal silica with an equal volume of water. The non-spherical colloidal silica exhibits a higher polishing rate while maintaining surface quality during polishing and has extremely low total metal impurity content.

Abstract: A combustible gas sensor that includes a reference sensor. The reference sensor includes a first substrate having a first substrate first surface, a first insulating layer disposed on the first substrate first surface, and a first heater at least one of embedded within the first insulating layer and disposed on the first insulating layer. The first substrate is a MEMS substrate.

Abstract: The invention provides a calculation method for dike breach development process, which relates to the field of flood disaster prevention. In this method, the influence of hydrodynamic on the development rate of the breach is considered, and the unit discharge of the breach is taken as the main parameter. The parameter expression between the hydrodynamic factors and the development process of the breach is established for both lateral widening and vertical downcutting. According to the invention, the whole development process of dike breach can be calculated with only a few parameters, and the main parameter unit discharge can be directly obtained by the discharge formula of broad crested weir. As the calculation incorporating as much physical mechanism as possible and simple calculation procedure, the method has high practicability, good repeatability and scientificity.

Abstract: A combustible gas sensor that includes a reference sensor. The reference sensor includes a first substrate having a first substrate first surface, a first insulating layer disposed on the first substrate first surface, and a first heater at least one of embedded within the first insulating layer and disposed on the first insulating layer. The first substrate is a MEMS substrate.