51results about How to "The experiment takes a short time" patented technology

The present invention provides a femtosecond time-resolved multi-channel phase-locked fluorescence spectrometer based on optical parameter amplification, including: a laser light source and a beam splitter; a sample excitation light generation part, which is used for frequency conversion of the fundamental frequency light output by the laser light source; The focusing device of the sample excitation light and the sample cell where the sample is fixed; the collection and convergence system of the sample fluorescence; the generation part of the pump light required for the fluorescence light parametric amplification; the optical parametric crystal, used for the non-collinear light generation of the pump light and the fluorescence Parametric process; time-resolved fluorescence spectrum data acquisition system; optical path delay system, used to change the time delay between optical parametric pump light and sample excitation light; data acquisition system is a data acquisition system based on a multi-channel lock-in amplifier. The invention can realize a single measurement to obtain a time-resolved fluorescence spectrum without hyperfluorescence background interference.

The invention relates to the technical field of sample fixing devices, and specifically relates to a sample fixing platform. The sample fixing platform comprises a base and a cylinder arranged on the base, wherein a plurality of sample placing positions are arranged at the upper end of the cylinder; and fixing parts for fixing samples are arranged on the sample placing positions. The invention also relates to a freeze scanning electron microscope containing the sample fixing platform. According to the sample fixing platform and the freeze scanning electron microscope containing the sample fixing platform provided by the invention, a plurality of fixing parts are arranged at the upper end of the cylinder, and a plurality of samples such as blades can be fixed simultaneously, so that the consumed time for experiments is short, the experiment efficiency is greatly improved, and the economic cost in the experimental process is also reduced.

The invention provides a microstructure parameter-based clay consolidation coefficient prediction method, which comprises the steps of: conducting clay consolidation experiments under different pressures, and measuring the void ratio according to conventional geotechnical experiments; calculating the consolidation coefficients of different consolidation experiments; employing a scanning electron microscope technique to obtain a microstructure photo of a corresponding sample section; carrying out granule area and void area segmentation on the clay microstructure photo, and extracting the information of granule unit sum, unit direction, total area, total circumference, and area ratio; analyzing the granules and establishing a main component expression with an accumulative contribution rate of over 95%; and establishing the relationship between the main components and the clay consolidation coefficient. The method provided in the invention links the consolidation coefficient of clay with its microstructure parameters to obtain corresponding consolidation coefficient indexes under different pressures according to the clay void ratio and micro-parameter main components. The method can effectively shorten the experiment time at a civil engineering investigation phase.

The invention relates to a high-precision electronic multi-activity isothermal-adsorption experimental apparatus. The experimental apparatus consists of an external case and a single-activity weighing unit and is characterized in that the external case comprises an isothermal water cycle temperature control system, adjustable foot pads, a glass door, a level gauge, a data recording system and a control panel; the isothermal water cycle temperature control system consists of a water tank, a temperature control component, an electric heating wire, a water pump, a water-circulation pipeline and a temperature control system; the single-activity weighing unit consists of a shell, high-precision electronic weighing units, a dynamic atmosphere circulator, a working area, a sample cabinet, a water cistern and a weighing bottle; the shell is a rectangular hollow shell, five high-precision electronic weighing units are arranged in the shell, and the sample cabinet and the water cistern are separately placed at an upper half part and a lower half part of the shell. According to the high-precision electronic multi-activity isothermal-adsorption experimental apparatus, an adsorption environment can be effectively controlled indoors, data of a plurality of samples of multiple activities are accurately and simultaneously measured and are continuously recorded under different temperatures, and a continuous sample quality changing process is obtained.