39results about How to "Reduce excessive noise" patented technology

Apparatus, systems and methods of 110 (one hundred ten) CFM (cubic feet per minute) generating ventilation fans for bathrooms with grill covers and with or without lights in the grill covers. Spring clip type washers can attach the grill covers to the housings. Suspension brackets directly attached to outer side walls of the housing can support the housings. One suspension bracket can be mounted on a bottom wall of the housing and another suspension bracket of equal length can be mounted on a side wall of the housing that is oriented perpendicular to the bottom wall. Bent flanges on the suspension brackets can be on opposite ends of the respective brackets. A lens cover can cover a light box that holds light sources centrally located in the grill cover. The grill cover can include vent openings that allow incoming air to bypass the light sources that can be located inside of the light box.

Apparatus, systems and methods of 80 / 90 CFM ventilation exhaust fans for bathrooms with telescoping side extension brackets and side by side electric driven motor and blower wheel, and being used with or without lights. The exhaust fans can include a single main housing, that allows for a blower housing to support the motor and a blower wheel in a side by side arrangement. The exhaust fans can further include an outside wiring box that is externally located to the main housing. The wiring box can have support male plugs and female receptacles for supplying an electrical power supply to the electric motor and light. The side extension brackets can include telescoping members that allow the exhaust fans to be easily attached to structural members inside of a ceiling so that the exhaust fan has a vent cover attached to the ceiling. Inside of the exhaust fans can be light box with closed sides and bottom which prevents incoming air from passing directly onto the lights. Instead incoming air is drawn to pass around the outside of the light box so that the light box functions as a heat sink reducing the heat generated from the light.

The invention relates to an energy band transmutation multiplication region structure for an avalanche photodiode, and a preparation method of the energy band transmutation multiplication structure. The invention is characterized in that: an n-layer material of which the energy band gradient is transmuted is used as the multiplication region structure, n is a natural number, and x is more than orequal to 2 and less than or equal to 10. The preparation method comprises a step of: growing the n-layer material of which the energy band gradient is transmuted as a multiplication region structure after growing a buffer layer, an absorption layer, a digital transmutation superlattice transitional layer and a charge layer. By the energy band transmutation multiplication region structure, the ionization rate difference between electrons and cavities can be increased substantially, and external very high bias voltage is not needed; therefore, the over-residual noises of the device can be reduced effectively.

A single-to-multi mode converter and an optical code division multiple access system using the same. The mode converter includes first, second, and third optical waveguides. The first optical waveguide is formed of a single-mode optical fiber and outputs a single-mode optical signal. The second optical waveguide converts the single-mode optical signal output from the first optical waveguide to a multi-mode optical signal and allows the optical power of the single-mode optical signal to be coupled to each mode of the multi-mode optical signal. The third optical waveguide is formed of a multi-mode optical fiber and transmits the multi-mode optical signal output from the second optical waveguide.

Apparatus, systems and methods of generating 70 (seventy) CFM (cubic feet per minute) from ventilation fans for bathrooms with flush mount lights and having the motor partially inside and beneath the blower wheel. A one piece or multipiece housing for the bath fan can be attached to joists in the ceiling by a long telescoping mounting bracket, and a short telescoping mounting bracket that are each directly mounted on opposite outer side walls of the housing. A decorative pan about the light can have vents that receive the incoming air into the fan, which is exhausted therefrom by the motor driven blower.

Apparatus, systems and methods of 80 / 90 CFM ventilation exhaust fans for bathrooms with telescoping side extension brackets and side by side electric driven motor and blower wheel, and being used with or without lights. The exhaust fans can include a single main housing, that allows for a blower housing to support the motor and a blower wheel in a side by side arrangement. The exhaust fans can further include an outside wiring box that is externally located to the main housing. The wiring box can have support male plugs and female receptacles for supplying an electrical power supply to the electric motor and light. The side extension brackets can include telescoping members that allow the exhaust fans to be easily attached to structural members inside of a ceiling so that the exhaust fan has a vent cover attached to the ceiling. Inside of the exhaust fans can be light box with closed sides and bottom which prevents incoming air from passing directly onto the lights. Instead incoming air is drawn to pass around the outside of the light box so that the light box functions as a heat sink reducing the heat generated from the light.

The invention discloses a back illuminated cascade multiplication avalanche photodiode. A buffering layer, an n-type AlxGa1-xN layer, an i-type periodical cascade multiplication layer, an i-type intrinsic absorbing layer and a p-type electrode layer are successively arranged from bottom to top on a substrate. An optical coupling gathering structure is arranged at the periphery of the i-type intrinsic absorbing layer tabletop. According to the back illuminated cascade multiplication avalanche photodiode, through the optical coupling gathering structure, a problem of low effective absorption rate of a periodical cascade multiplication structure in back illumination is effectively settled, and furthermore dimension of a device tabletop is reduced and body leakage current is reduced. According to the back illuminated cascade multiplication avalanche photodiode, a solution for effective operation of a periodical cascade multiplication avalanche photodiode in back illumination is generated. The back illuminated cascade multiplication avalanche photodiode is suitable for large-scale array integration and is suitable for multiple wavebands in ultraviolet light, visible light and near-infrared light, and furthermore can be widely used in weak light detection imaging and single-photon detection imaging.

A device for control of the effects of vibrations on vibration sensitive equipment when a plurality of the devices are placed on a support surface and in operative contact with the vibration sensitive equipment where said device is a unitary piece of a soft, pliable substance having a hardened round crown portion.

By improving the rigidity of a pulley while suppressing a weight of the pulley from increasing, excessive noises due to resonance can be reduced. A washing machine 1 includes a drum 9 rotatably disposed in the water tub 5. The washing machine 1 has a motor to rotationally drive a pulley 20, which is fixed to the drum 9, via an endless belt 13. The pulley 20 has a plurality of arms 23 radially extend from the boss 22 to support an outer wheel 21. The arm 23 has a variable cross-sectional portion 24 in which a section modulus against bending in an axial direction gradually decreases from the boss 22 to the outer wheel 21.

A bolometric detector for electromagnetic radiation comprising a sensitive part or membrane comprising one or more layers of a sensitive material, the resistivity of which varies with temperature; first electric conductor elements in electrical continuity with a readout circuit associated with the bolometric detector and acting as electrodes for the detector and being in contact with the sensitive material and acting as an electromagnetic radiation absorber; second electric conductor elements at a floating potential acting only as an electromagnetic radiation absorber; at least one support area for the sensitive part fulfilling the function of positioning the sensitive part and electric conductor in relation to the readout circuit; at least one thermal isolation structure electrically and mechanically linking each support area to the sensitive part. The conductor elements are distributed as two crossed, superimposed networks of conductive tracks, the first of the two networks comprising all the first conductor elements.

The invention discloses a high-strength counterweight filler for an elevator. The counterweight filler is characterized by being prepared from components in parts by weight as follows: 40-80 parts ofcement, 20-40 parts of steel slag, 10-22 parts of iron ore, 7-10 parts of an adhesive, 4-10 parts of a defoamer, 2-5 parts of an anti-crack agent, 4-7 parts of a concrete anti-crack densifier, 2-6 parts of a hardening agent, 2-6 parts of a concrete expansive agent, 2-8 parts of anorthite, 4-7 parts of hyalophane, 2-8 parts of nano-silica, 1-4 parts of lignin and 5-10 parts of water. According to the formula of the counterweight filler, resources are saved, lift strength between the counterweight fillers is increased, service life is prolonged, and too large noise in a motion process of a counterweight device is reduced.

The invention provides a combined counterweight block used for an elevator. The combined counterweight block comprises a counterweight frame and a plurality of composite counterweight block bodies arranged in the counterweight frame. Each counterweight block body is composed of, by weight, 34-46 parts of iron tailings, 23-36 parts of steel slag, 22-31 parts of barite, 32-50 parts of cement, 2-10 parts of rattan, 3-9 parts of wicker, 0-2 parts of PVC and 2-3 parts of plastic. According to the combined counterweight device, casting is completed by adopting the iron tailings, the steel slag, the barite and the cement, and the rattan, the wicker, the PVC and the plastic are added, so that the pulling strength among the counterweight block bodies is improved, and the service life is prolonged; and in addition, the problem that the noise of the counterweight device is too large in the movement process is solved.

Apparatus, systems and methods of generating 70 (seventy) CFM (cubic feet per minute) from ventilation fans for bathrooms with flush mount lights and having the motor partially inside and beneath the blower wheel. A one piece or multipiece housing for the bath fan can be attached to joists in the ceiling by a long telescoping mounting bracket, and a short telescoping mounting bracket that are each directly mounted on opposite outer side walls of the housing. A decorative pan about the light can have vents that receive the incoming air into the fan, which is exhausted therefrom by the motor driven blower.

The present invention provides a NOMA-based vehicle networking resource allocation method, which can effectively improve network access capabilities and significantly increase the total transmission rate of all users. The method of the present invention firstly introduces the concept of clustering, and the base station merges the users into clusters according to the geographic location of the VUE users, and the users in the same cluster can share the same frequency spectrum resource. Then, in order to reduce the co-channel interference between CUE and V2V, the Hungarian algorithm is used to determine the CUE users and VUE user clusters sharing the same spectrum resources, and finally, the particle swarm optimization algorithm is used to iteratively optimize the non-convex problems in the VUE user cluster to obtain each The suboptimal transmit power of the V2V sender, and calculate the corresponding suboptimal VUE throughput. The present invention applies NOMA to V2V unicast users in the communication between vehicles. On the basis of ensuring the service quality of V2I and V2V communication, the total throughput of V2V users reaches the maximum value, and provides a solution for the V2X resource allocation problem under NOMA. new ideas.

In a tensioner having a ratchet mechanism composed of annular teeth on a plunger and an expansible resilient ring disposed in a groove formed in the inner peripheral surface of a plunger-accommodating hole in a tensioner housing, the rear surfaces of the annular teeth have a steep slope, and the front surfaces of the annular teeth have a gradual slope with a convex curvature such that the rate of change of the slope decreases proceeding in the direction of retraction of the plunger.

By improving the rigidity of a pulley while suppressing a weight of the pulley from increasing, excessive noises due to resonance can be reduced. A washing machine 1 includes a drum 9 rotatably disposed in the water tub 5. The washing machine 1 has a motor to rotationally drive a pulley 20, which is fixed to the drum 9, via an endless belt 13. The pulley 20 has a plurality of arms 23 radially extend from the boss 22 to support an outer wheel 21. The arm 23 has a variable cross-sectional portion 24 in which a section modulus against bending in an axial direction gradually decreases from the boss 22 to the outer wheel 21.

The invention relates to a rail transit vehicle air conditioner buffer pressure wave protection device which comprises a cylinder, a cylinder installation plate, a support column, a sealing plate, a sealing ring and an installation base plate. The support column is fixed on the installation base plate, the cylinder installation plate is fixed at the top end of the support column, the cylinder is fixed on the cylinder installation plate, the sealing plate is fixed on the end portion of a piston rod of the cylinder, the sealing ring is fixed on the upper surface of the installation base plate, the sealing ring is matched with the sealing plate, and a sealing plate lifting guide mechanism is arranged on the installation base plate and the sealing plate. The device can effectively increase the closing speed of a rail transit air conditioning system pressure wave device, solves the problem of large noise, and is simple in structure, low in manufacture difficulty, high in automation degree, high in response speed, low in noise and capable of being integrated on an air conditioning system to conduct centralized control.

The invention relates to an energy band transmutation multiplication region structure for an avalanche photodiode, and a preparation method of the energy band transmutation multiplication structure. The invention is characterized in that: an n-layer material of which the energy band gradient is transmuted is used as the multiplication region structure, n is a natural number, and x is more than or equal to 2 and less than or equal to 10. The preparation method comprises a step of: growing the n-layer material of which the energy band gradient is transmuted as a multiplication region structure after growing a buffer layer, an absorption layer, a digital transmutation superlattice transitional layer and a charge layer. By the energy band transmutation multiplication region structure, the ionization rate difference between electrons and cavities can be increased substantially, and external very high bias voltage is not needed; therefore, the over-residual noises of the device can be reduced effectively.

The invention provides an infrared semiconductor avalanche detector and a preparation method thereof. The infrared semiconductor avalanche detector comprises a GaN / AlN superlattice multiplication structure and a narrow bandgap semiconductor absorption structure on the GaN / AlN superlattice multiplication structure, wherein the GaN / AlN superlattice multiplication structure and the narrow bandgap semiconductor absorption structure are in bonding connection. According to the infrared semiconductor avalanche detector and the preparation method, the ionization coefficient ratio of electron holes isimproved, the unipolar ionization of electrons is achieved, the excess noise is reduced, and a high gain is provided.

The invention discloses a ventilation pipe for a sweet potato cellar, the structure of which comprises a blocking cylinder, a muffler cylinder, a connecting pipe, and an air outlet. The top of the tuyere is embedded and connected, and the end of the connecting pipe on the other side is welded to the blocking tube. The blocking tube includes a partition turntable, an air inlet and outlet, a circulation tube, and a fixing seat. The inner end is embedded and connected, and the invention rotates with the help of the wind guide through the partition turntable, so that the internal pest control sheet rotating roller is triggered to cooperate with the outwardly protruding baffle to form a gap to provide activity space for the pests, so that when the net is shot Under the rotation of the board, the surface of the screen continuously slaps the crawling pests, so that the pests change the direction of entry, effectively preventing the ventilation pipe from becoming a guide pipe for pests, and solving the problem of the internal sweet potato being eaten by the pests that crawled into it. .