The subject disclosure presents systems and computer-implemented methods for evaluating a tissue sample that has been removed from a subject. A change in speed of the energy traveling through the sample is evaluated to monitor changes in the biological sample during processing. The rate of change in the speed of the energy is correlated with the extent of diffusion. A system for performing the method can include a transmitter that outputs the energy and a receiver configured to detect the transmitted energy. A time-of-flight of acoustic waves and rate of change thereof is monitored to determine an optimal time for soaking the tissue sample in a fixative.

The application provides a method, an apparatus and a device for evaluating a dynamic diffusion of natural hydrogen in rock pores. The method includes: performing, at a target pressure and a target temperature, a simulation calculation of a natural hydrogen adsorption based on a pre-constructed pore model of a rock to be evaluated, and determining an average number of hydrogen molecules adsorbed in the rock pores when the natural hydrogen is saturated at the target pressure and the target temperature; determining a natural hydrogen content, based on lithologic parameters, the average number of hydrogen molecules, the target pressure and the target temperature; adding one or more preset gases to the pre-constructed pore model, determining a loss content of the natural hydrogen, and determining a diffusion coefficient of the natural hydrogen; determining a diffusion evaluation parameter, based on the natural hydrogen content, the loss content and the diffusion coefficient.

Provided are a monitoring method and apparatus, a device, and a medium. The method includes selecting a diffusion model according to a diffusion characteristic of polyurethane in the porous medium and winding a distributed optical fiber around at least one sensing cage to form a helical structure; mapping coordinates of each temperature measurement point on the helical structure to a spatial Cartesian coordinate system of the porous medium; measuring an initial moisture field of the porous medium before polyurethane infiltration; monitoring a post-infiltration moisture field in the stabilized state of temperature transmission fluctuations during the polyurethane diffusion that occurs in the polyurethane infiltration in the porous medium; and analyzing a change in water content based on the initial moisture field and the post-infiltration moisture field and identifying a polyurethane diffusion distribution field in the porous medium in conjunction with the diffusion model.

The present disclosure relates to a forced oxidation test system, including: forced oxidation subsystems, a first cabinet, a second cabinet, and connecting devices. Inner cavities of adjacent forced oxidation subsystems are arranged in parallel. The forced oxidation subsystems include: forced oxidation portions, inner cavities of adjacent forced oxidation portions being arranged in series. To-be-tested packages are placed on the first cabinet. The second cabinet is connected to the first cabinet through the connecting devices. The forced oxidation subsystems are arranged opposite to the to-be-tested packages. The second cabinet is configured to move along an axis of the connecting devices towards a direction adjacent to the to-be-tested packages until the inner cavities of the forced oxidation portions are sealed and mounted on the to-be-tested packages, such that a replacement gas in the inner cavities of the forced oxidation portions is permeated into the to-be-tested packages.

An in vitro trans-dermal diffusion apparatus for gas exposure, including: a gas generator, an exposure chamber, an exhaust treating device, a sampling arm, a diffusion chamber, a liquid replenishment tank, and a sample bottle rack. The in vitro trans-dermal diffusion apparatus for gas exposure supports multiple diffusion chambers conducting gas exposure experiments simultaneously. The sampling port and replenishing port of the diffusion chamber are separated, enabling the rapid replenishment of fluids through a replenishment tank after sampling, which reduces the time the skin membrane is separated from the receptor fluid. The sampling arm of the in vitro trans-dermal diffusion apparatus for gas exposure, combined with a telescoping rod, allows the sampling needle to be inserted into the sampling port for sampling and can also be extended into a sample bottle to release the sample, minimizing the contact between the sample liquid and the air.