Abstract: Provided are a perovskite material with stable bipolar molecules and a photoelectric device. The invention aims to provide the perovskite material with the stable bipolar molecules and the photoelectric device, which can indirectly enhance an interaction between metal cations and halogen anions, reduce a defect state density in the perovskite material, and inhibit ion migration in the perovskite material by utilizing bipolar groups in a bipolar molecule stabilizer. A component of the perovskite material with the stable bipolar molecules is D: A?2An?1BnX3n+1 or D: ABX3, wherein A? is an organic amine cation, A is a monovalent cation, B is a metal cation, X is a monovalent anion, and D is the bipolar molecule stabilizer. A thermal stability, a phase stability and a photoluminescence stability of the material are remarkably enhanced, and working stabilities and efficiencies of the perovskite material and the photoelectric device are remarkably improved.

Abstract: A catalytic reaction unit has a plurality of catalyst bed layers arranged vertically, each of the catalyst bed layers being filled with a solid catalyst, and an inclined surface on the upper part of the corresponding solid catalyst arranged between adjacent catalyst bed layers; a liquid phase feeding subunit arranged above the topmost catalyst bed layer, and the liquid phase feed is guided by the inclined surface to sequentially enter each catalyst bed layer from top to bottom; a gas phase feeding subunit arranged between the catalyst bed layer of an upper layer and the inclined surface of the next layer, and a gas phase channel relatively isolated from the gas phase feeding subunit. The gas phase product generated after the gas-phase feed and the liquid phase feed react in the catalyst bed layer directly enters the gas phase channel.

Abstract: The present invention provides a two-component foamable silicone composition comprising: a component A comprising (a) at least one polyorganosiloxane having at least one vinyl group, (b) at least one chemical blowing agent, and (c) at least one catalyst; and a component B comprising (d) at least one polyorganosiloxane having at least one vinyl group, and (e) at least one polyorganosiloxane having at least one —SiH group, and at least one expandable graphite in an amount of less than 10% by weight, based on the total weight of the component B, which exhibits excellent flame retardancy, good sealing performance, high compression rate, low gasket density, good dispensing continuity and good cell structure. The present invention also provides a preparing method and use thereof.

Abstract: Methods and systems for testing fluid samples include a diffused air flotation (DAF) system and a jar. The jar includes a diffuser for injecting the diffused air into the jar and a tap for drawing a fluid out of the jar.

Abstract: Methods and systems for testing fluid samples include a diffused air flotation (DAF) system and a jar. The jar includes a diffuser for injecting the diffused air into the jar and a tap for drawing a fluid out of the jar.