52results about How to "Realize a wide range of adjustment" patented technology

The preparation method of the rare earth molybdenum alloy with different grain sizes disclosed by the invention comprises three steps of solid-solid mixing, reduction and sintering. The preparation method of rare earth molybdenum alloys with different grain sizes in the present invention realizes rare earth molybdenum alloys by controlling the addition method and amount of water in the doping process, and without making too complicated changes to the existing sintering process and sintering method. The molybdenum alloy grain size can be adjusted in a large range between 20 and 2000 μm. The method is simple in operation, low in cost, strong in controllability, and has a wide adjustment range of grain size, and meets the requirements of different products on the grain size of the rare earth molybdenum alloy.

The invention discloses an air volume adjusting valve with a novel structure. The air volume adjusting valve comprises a valve body with valve cavities, a first valve element and a second valve element, wherein the first valve element and the second valve element are contained in the valve cavities. The valve cavities comprise the front valve cavity and the rear valve cavity which are arranged in a front-and-back through manner. The first valve element is arranged in the front valve cavity, and the second valve element is arranged in the rear valve cavity. The first valve element is roughly in a conical shape so as to be provided with a conical side face and a conical bottom face. The front valve cavity is provided with a conical cavity face roughly matched with the conical side face of the first valve element. The conical bottom face faces an air inlet end. A positioning shaft is fixedly arranged in the front valve cavity. A cone hole is formed in the first valve element. The first valve element is arranged on the positioning shaft through the cone hole in a sleeving manner and is combined with a reset spring. The reset spring is arranged on the positioning shaft in a sleeving manner, and the axial position of the positioning end of the reset spring can be adjusted. The second valve element is in a disc shape and can be arranged in the rear valve cavity in a radial rotation manner. The driving shaft is rotated to penetrate the cavity wall of the rear valve cavity to be connected to the second valve element. Thus, the air volume adjusting valve can deal with laboratory environments changing continuously, and therefore the face velocity of a ventilation cabinet can be stably controlled.

The invention discloses an ellipsoid reflector-based penetrating depth adjustable TIRF microscope and a method therefor and belongs to the field of optical wide field microscopic imaging. The microscope consists of a cone reflector-based annular parallel light beam generation optical path, an ellipsoid reflector-based illumination optical path and a common fluorescence microscopic imaging optical path; according to the method, sample excitation depth can be changed via adjustment of distance between two complementary cone reflectors. According to the penetrating depth adjustable TIRF microscope and the method therefor, omnibearing shadow-free illumination is provided for samples based on rotation characteristics of an ellipsoid reflector, lighthouse-shaped flaws caused by unidirectional illumination in a conventional solution can be eliminated, and imaging quality can be improved; based on a characteristic of a large numerical aperture of the ellipsoid reflector, total internal reflection is provided in such a way that a sample illumination incidence angle can be precisely and finely adjusted in a large scope ranging from a critical angle of total reflection to nearly a 90 degree angle, requirements of gradually rising TIRF axial super-resolution three dimensional imaging research for finely adjustable sample excitation depth can be met, and finally TIRF imaging quality and axial resolution can be greatly improved.

The invention discloses a terahertz band-rejection filter comprising N×N identical units, which are periodically arranged on a plane perpendicular to the incident direction of the terahertz wave, and there is no space between adjacent units, N is an integer greater than or equal to 2, and a single The unit includes a first metal resonant layer, a second metal resonant layer, and a substrate; the first metal resonant layer is attached to the center of the upper surface of the substrate, and the second metal resonant layer is attached to the center of the lower surface of the substrate; the first metal resonator Both the first metal resonant layer and the second metal resonant layer are cross-shaped and have the same size; after the wave is incident, electromagnetic resonance is generated on the first metal resonant layer and the second metal resonant layer, and the electromagnetic energy at the resonant frequency is used to maintain electronic oscillation, thus Form the filter stopband. The invention has the advantages of rapid attenuation of the stop band, fine-tuning and wide-range adjustment of the bandwidth, simple structure and easy manufacture, low cost, etc., and simplifies the structure of the terahertz band-stop filter.