The invention relates to methods for preparing aqueous solutions of mineral salts with a composition corresponding to that in equilibrium with solid rock minerals under the target conditions of the experiment. The technical result achieved by implementing the invention is to provide the possibility of obtaining a model of formation water with a composition closest to real formation water at target values of temperature and pressure, without the need for water sampling in the field. In accordance with the proposed method of preparation of the formation water model, a rock sample containing soluble hard skeleton minerals and/or salt deposits in the pore space, which was initially saturated with formation water and contains at least one area that has not been exposed to drilling fluid, is taken from the formation. The amount and composition of soluble sediments in the collected sample and the water saturation of the sample under reservoir conditions are determined. At least one internal region in the sample, not exposed to the drilling fluid, is selected and a three-dimensional digital model of the selected region is built, reflecting the pore structure and spatial arrangement of minerals. The water solubilization chemical reactions for all water-soluble minerals found in the sample are set. Numerical modeling of the initial saturation of the sample under study with water is carried out, taking into account the dissolution of minerals included in the sample at the required temperature and pressure until equilibrium is reached. The final ionic composition of the aqueous solution saturating the pore space of the numerical model after equilibrium is reached is determined, and the solution is prepared by dissolving the calculated amount of salts in the calculated amount of water while stirring. The resulting salt solution is brought to the required thermobaric conditions.

A device is disclosed. The device contains a first light source configured to excite fluorescence emission of a first contaminant on a surface, and a first optical sensor configured to capture one or more images of the fluorescence emission of the first contaminant.

The present invention provides a simulation testing device for scouring and erosion damage of accumulation slope under rainfall conditions, belonging to the field of geotechnical engineering technology. It comprises a water supply subsystem, a rainfall simulation subsystem, and an accumulation slope simulation subsystem. The water supply subsystem comprises a water supply tank and a main water pipe, and the water supply tank can be used to store testing water. The rainfall simulation subsystem comprises a rainfall nozzle, and the accumulation slope simulation subsystem comprises an adjustable slope surface. The outlet of the rainfall nozzle has a first set distance from the adjustable slope surface; The water supply box is communicated to the rainfall nozzle through the main water pipe, and the positive projection of the rainfall nozzle on the adjustable slope comprises the adjustable slope surface, so that the test water can be sequentially dropped onto the adjustable slope surface through the main water pipe and the rainfall nozzle. It can achieve the characterization of damage modes, adjustable slope gradient, and simultaneous consideration of raindrop splash erosion and surface runoff effects in the scouring and erosion damage testing of accumulation slopes, providing the theoretical basis for the inversion and prediction of the entire process of scouring and erosion damage areas in actual engineering.

A battery testing apparatus and a battery production device, which belong to the technical field of batteries. The battery testing apparatus comprises a ray source, a detector and a carrying mechanism, wherein the carrying mechanism comprises a clamp, the clamp is used for clamping a battery to be tested, rays emitted by the ray source are projected to the detector through said battery clamped by the clamp, and the detector is used for acquiring a testing image of said battery on the basis of the received rays; and a side edge of the surface of the clamp that is used for being in contact with said battery has a chamfer.