4results about How to "Easy for quantitative analysis" patented technology

The application relates to a surface enhanced Raman scattering (SERS) substrate, a preparation method and application thereof, and belongs to the technical field of Raman spectrum detection. The substrate comprises, from bottom to top, a substrate layer, a distributed Bragg reflector, a chalcogen phase change material functional layer and a nanoscale metal structure layer. The distributed Bragg reflector is composed of a periodic structure stack of medium materials with different refractive indexes. The distributed Bragg reflector is coupled with the nanoscale metal structure layer to excite a Tamm state. The chalcogen phase change material functional layer can realize reversible regulation of amorphous state and crystalline state under external light excitation, changes the Tamm state resonance wavelength to regulate the SERS enhancement effect. The application realizes high-sensitivity detection through double enhancement of the Tamm state and localized surface plasmon resonance, has the characteristics of non-volatility, reconfigurability, high reproducibility and design flexibility, is convenient to operate, stable in performance, and is suitable for fields of chemical biological sensing, laboratory chip systems and optical encryption.

The utility model relates to the technical field of physical experiment teaching aids, in particular to a simple harmonic motion experiment instrument, which comprises a base, a liquid spraying device, a support arranged on the base and a paper feeding device arranged on the base, the support comprises a cross rod, a first vertical rod and a second vertical rod, the first vertical rod and the second vertical rod are arranged on two opposite sides of the cross rod, and the cross rod is provided with a cycloid and connected with a pendulum ball. A gap exists between the lowest point of the swing ball in the natural state and the base, a spring is fixed to the first vertical rod and is horizontally placed in the natural state, one end of the spring is detachably connected with the swing ball, the liquid spraying device comprises a spraying pipe, and the liquid outlet end of the spraying pipe is fixedly connected with the swing ball; a spring oscillator experiment and a simple pendulum experiment are integrated on one device, so that students can conveniently compare two simple harmonic motion phenomena on the same platform, the essence and generality of the simple harmonic motion can be deeply understood, and the teaching effect is optimized. Meanwhile, through the detachable connection design, quick switching between a spring oscillator experiment and a simple pendulum experiment is facilitated, and different experiment requirements are met.

The utility model relates to the technical field of simulation test device, concretely relates to a simulation test structure of simulation blasting fissure propagation and gas dissipation, wherein, the simulation test structure of simulation blasting fissure propagation and gas dissipation includes simulation seat and sets up the cannon column on simulation seat, at least one negative pressure chamber is provided in the simulation seat, a plurality of negative pressure pipes are connected on the simulation seat, each negative pressure pipe is communicated with the corresponding negative pressure chamber, and the negative pressure pipe is connected with negative pressure equipment, the impact unit is provided in the cannon column inner bottom, the technical problem that the physical mechanism that the present blasting simulation test device cannot truly simulate the dynamic propagation of original fissure and the dissipation of blast gas along the new fissure because of single structure function is solved.

The present application relates to the technical field of perforation fracturing damage experiment, and is a kind of perforation fracturing full-process cement sheath damage visualization experiment device and method, the former includes kettle body, simulated surrounding rock, casing, perforating gun, kettle body upper side and lower side are respectively equipped with kettle cover and kettle cover, kettle body is sequentially and spacedly equipped with casing, simulated surrounding rock from inside to outside, casing and simulated surrounding rock form cement annulus, simulated surrounding rock and kettle body form confining pressure cavity, confining pressure cavity is communicated with confining pressure tank through confining pressure pipeline, and perforating gun located in the lumen of casing is installed on the lower kettle cover.The present application is reasonable and compact in structure, easy to use, which simulates the formation environment outside the cement sheath and the surrounding rock constraint by heating, confining pressure and the like, realizes the differentiation of perforation damage site and fracturing damage site of cement sheath one and two interfaces through liquid circulation control system and different color calcium ion fluorescent probe, and is convenient for damage area differentiation and quantitative analysis.