178results about How to "Reduce the speed of propagation" patented technology

A radar level gauge system, for measuring a filling level of a content contained in a tank, said radar level gauge system comprising a transmitter arranged outside said tank and configured to transmit microwave energy, a receiver arranged outside said tank and configured to receive reflected microwave energy, and a transmission line probe, comprising at least one probe line, configured to guide transmitted microwave energy towards and from said content, said probe at least partly disposed inside said tank, wherein said transmission line probe further comprises a dielectric enclosing structure enclosing at least a substantial part of said at least one probe line, wherein said dielectric enclosing structure is arranged to reduce the microwave energy attenuating effect caused by said content to be gauged. An advantage with the above system is its improved accuracy when measuring a filling level of a content contained in a tank, as the attenuation introduced by the content is reduced by the dicloctric enclosing structure.

A phase shifter and method include a hybrid coupler being ground shielded. The hybrid coupler with reflective terminations connected to the hybrid coupler is configured to phase shift an applied signal wherein the reflective terminations include a parallel LC circuit.

The invention discloses a bacterial drug resistance quick projection system and method. The system comprises bacteria genome DNA extracting equipment, bacteria genome fingerprint typing equipment, an intelligent terminal, a cloud server and a bacteria database server, wherein the bacteria genome DNA extracting equipment and the bacteria genome fingerprint typing equipment are connected; the intelligent terminal is connected with the cloud server through internet; the cloud server is further connected with the bacteria database server. The system and the method utilize technologies of internet and safe cloud computing storage, can be applied to not only antibiotic drug resistance spectrum prediction of clinical separation bacterial strains, but also antibiotic drug resistance spectrum prediction of environment separation bacterial strains, are beneficial to guidance of accurate antibiotic use of specialists, reduce the drug resistance gene spreading speed, and can also be an information platform of a bacterial drug resistance monitoring network.

The invention discloses an E-shaped all-dielectric super-surface electromagnetic induction transparent resonance device. The device comprises a substrate and E-shaped dielectric resonance units whichare located on the surface of the substrate and distributed in a two-dimensional periodicity mode, the substrate is made from dielectric materials, and the dielectric constant of the substrate is larger than 0 and smaller than or equal to 5; the dielectric constant of the E-shaped dielectric resonance units is larger than or equal to 6. Accordingly, the group refractive index can be increased, andthe slow light effect can be achieved. Meanwhile, the device can be used for high-sensitivity refractive index sensing devices.

The invention provides a speed compensation method for asymmetric structure grid, which employs the regular gate structure and deformation gate structure which periodically or quasi-periodically change in different slot width along axes as basic slow--wave structure to calculate the length and period of the gate structure. The slot having shorter route on discontinuous coplanar waveguide is set as gate structure according to the length and period of the gate structure. For speed compensation bending coplanar waveguide, the outer slot structure thereof is no changed, and the inner slot width periodically changes along axes to form grid; The slot of the bending waveguide having shorter route is made into a slot with gate structure thereby slowing the propagation speed of the electromagnetic wave on the route, thus, the phases of the two route become similar after passing the bending structure, then the signal can keep synchronization in time. The structure can be directly executed grid processing on the floor of the coplanar waveguide and the signal line, so can be directly achieved in the procedure for making the coplanar waveguide without increasing original circuit volume, thus, is fit for batch production of printed circuit.

A dispensing device and a storage device for dispensing a formulation as a spray. The storage device has multiple separate and pre-metered doses of the formulation in receptacles or cavities. In order to allow a very compact arrangement, the receptacles or cavities are arranged in a first group and a second group axially offset, and preferably, forming a double ring arrangement, and the storage device is rotatable and axially moveable for dispensing the doses one after the other.

The present invention relates to the technical field of chemical industry machinery, and discloses a wave-absorption vibration-reduction silk screen fire-resistance explosion-suppression apparatus, which comprises a silk screen flame arrester and an aluminum silicate cotton wave-absorption vibration-reduction noisedamping material, wherein the silk screen flame arrester further comprises tube flanges, flame arrester housings and a silk screen fire resistance layer, the flame arrester front housing and the pipe flange I form an integrated structure, the flame arrester rear housing and the pipe flange II form an integrated structure, the silk screen fire resistance layer is laterally placed in the flame arrester housing, and is fixed in a clamping manner through the flame arrester front housing and the flame arrester rear housing, and the aluminum silicate cotton wave-absorption vibration-reduction noisedamping material is lined on the inner wall of the flame arrester housing. According to the present invention, the aluminum silicate cotton wave-absorption vibration-reduction noisedamping material and the silk screen structure with functions of flame inhibition and fire resistance are organically combined so as to significantly reduce a flame propagation speed and improve an explosion suppression and flame inhibition performance of the silk screen fire-resistance explosion-suppression apparatus.

The invention relates to an additional eccentric acoustic black hole vibration reduction structure, and in a uniform area, namely a cylindrical area, of the vibration reduction structure, the propagation speed and wavelength of waves with a certain frequency are not changed. However, at an acoustic black hole part, the propagation speed of the wave is reduced along with the reduction of the thickness; the wavelength is reduced, the vibration amplitude of waves is increased and is gathered toward an area with reduced thickness, when the waves arrive at the cut-off position, due to the fact thatthe vibration reduction structure is provided with an acoustic black hole extending part, namely a first annular part, bending waves continue to be propagated at the wavelet speed, the weak-structureposition occurs at the outermost end of the structure, the deformation of the outer end is easier, the acoustic black hole effect is easier to occur, and the high-efficiency broadband vibration reduction and noise reduction are achieved.

The invention discloses an acoustic black hole sandwich flat plate vibration reduction structure, and relates to a sandwich flat plate. According to the invention, the problems of complex structure and high price when the vibration and noise reduction problem of an aircraft structure is solved by adopting an active control mode in the prior art are solved. Orthogonal stiffened plates (4) are arranged on planes on one side of a panel (1) and one side of a back plate (3), a plurality of cavities (7) are formed in the orthogonal stiffened plates (4), a plurality of acoustic black holes (5) are embedded in the upper side face and the lower side face of a bilateral acoustic black hole embedding plate (2), cut-off holes (6) are formed in the thinnest positions of the acoustic black holes (5), the panel (1), the bilateral acoustic black hole embedding plate (2) and the back plate (3) are fixedly connected from top to bottom, each acoustic black hole (5) in the bilateral acoustic black hole embedding plate (2) is embedded into one cavity (7), and the acoustic black holes (5) embedded into the cavities (7) are of a single-cell structure. The structure is used for vibration and noise reduction of aircrafts.

The invention specifically relates to an aramid paper honeycomb composite floor with strong sound insulation performance and a preparation method thereof, belonging to the technical field of preparation of new materials. The aramid paper honeycomb composite floor comprises cured sheets of prepreg, porous nitrile rubber and an aramid paper honeycomb, wherein the aramid paper honeycomb is glued between porous nitrile rubber I and porous nitrile rubber II by an adhesive; the upper surface of the porous nitrile rubber II is glued with a prepreg cured sheet I by the adhesive; the lower surface of the porous nitrile rubber II is glued with a prepreg cured sheet II by the adhesive; the prepreg cured sheets have surface density of 500 + / - 20 g / m<2>, resin content of 40% and volatile content of 8%; and the prepreg cured sheets comprise a single-layer prepreg cured sheet and a double-layer prepreg cured sheet, the single-layer prepreg cured sheet has a thickness of 0.25+ / - 0.025 mm, and the double-layer prepreg cured sheet has a thickness of 0.38 + / - 0.02mm.

The invention belongs to the technical field of building members, and particularly relates to a fabricated steel structure wall body. The fabricated steel structure wall body comprises a base frame and panels, wherein the base frame comprises a top plate, a bottom plate and supporting rods, and the panels are installed at the two sides of the supporting rods; two slide grooves are formed in the left end face of each panel, and first sealing plates are in sliding fit with the interiors of the slide grooves; a first spring is installed between each first sealing plate and the corresponding slidegroove; an insertion groove is formed in the right end face of each panel; a piston groove is formed in each panel, a piston panel is in sliding fit with the interior of each piston groove, and an oil groove is formed in each panel; a piston rod is installed on each piston panel; several ventilation grooves are formed in each panel from top to bottom, and a first accommodation groove is formed ineach first sealing plate; and a slide plate is in sliding fit with the interior of each first accommodation groove, a limiting rod is installed on the inner side face of each slide plate, and a second spring is installed between the outer side face of each slide plate and the corresponding first accommodation groove. According to the fabricated steel structure wall body, the panels are convenientto detach, and are unlikely to extrude each other when expanding, and during shrinkage, good effects of sound insulation and thermal insulation can also be guaranteed.

This invention relates to one direct medium lens and its application in microwave detection, whose radio medium lens is composed of several dielectric parameters with equal difference change films for one to n between antenna and test objects. This invention method comprises the following steps: setting two different structure medium lens C and C'between antenna radiation surface A and test object with each lens composed of n pieces of medium slices C1-Cn and C'1-C'n with equal dielectric difference.