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35results about How to "Reduce the impact of loss" patented technology

Multi-core optical fiber coupler preparation method based on reverse tapering technology

ActiveCN110488417AReduce sensitivityLarge mode field diameterCoupling light guidesFiberWeld strength
The invention belongs to the technical field of optical fiber communication, and particularly relates to a multi-core optical fiber coupler preparation method based on reverse tapering technology. Themethod comprises the following steps: stripping a coating layer of a multi-core optical fiber, reversely tapering the multi-core optical fiber, and finishing cutting at the position with the maximumcladding diameter; preprocessing the plurality of single-core optical fibers, and preparing a single-core optical fiber bundle according to a fiber core arrangement mode of the multi-core optical fibers; stacking and fixing the single-core optical fiber bundle in a glass capillary tube, and performing fused biconical taper to enable each fiber core mode field, each fiber core position and the diameter of the capillary tube to be matched with each fiber core mode field, each fiber core position and the cladding diameter after reverse biconical taper of the multi-core optical fiber bundle; and cutting the waist of the tapering single-core optical fiber bundle, and aligning with one end of the maximum cladding diameter of the multi-core optical fiber to finish welding. According to the method, the alignment precision requirement can be reduced, and the optical coupling efficiency between multiple single-core optical fibers and each core of the multi-core optical fiber can be effectively improved; inter-core crosstalk during coupling is effectively suppressed, and meanwhile, the welding strength is improved.
Owner:FUDAN UNIV

TE011-lambada/4-pi mode resonator with three-dimensional structure

The invention discloses a TE011-lambada/4-pi mode resonator with a three-dimensional structure. Two output ends of each active circuit are connected with two open-circuit ends corresponding to the lambada/4 resonator at the junction of a silicon chip layer and a packaging layer; two short-circuit ends of each lambada/4 resonator are connected with TE011 cylindrical wave guide resonator on a firstconducting metal plate, and realize energy coupling with a cylindrical wave guide coupling groove seam by the lambada/4 resonator of the first conducting metal plate; a rectangular wave guide is assembled above a second conducting metal plate, and the two short-circuit ends of each lambada/4 resonator realize energy coupling with the cylindrical wave guide coupling groove seam by the rectangular wave guide of the second conducting metal plate, and output energy. The TE011-lambada/4-Pi mode resonator is suitable for power synthesis of silica-based Terahertz sources at the surface of the packaging layer, a passive circuit is separated from the active circuit, the quality factors of the resonator are higher, scale production can reduce the cost obviously, and the TE011-lambada/4-Pi mode resonator has application values in the fields of Terahertz personal wireless communication, low-power radars and the like.
Owner:ZHEJIANG UNIV

GNSS interference source positioning method based on grid energy traversal search

The invention discloses a GNSS interference source positioning method based on grid energy traversal search. The GNSS interference source positioning method comprises the following steps : the step 1,dividing a selected area into a plurality of grids; the step 2, taking any one observation point as a reference observation point, and calculating a reverse radiation energy value of each grid point;the step 3, radiating the energy of each grid point to another observation point by adopting a traversal search method, and calculating the radiation energy value received by the observation point; and the step 4, performing least square fitting on the energy actually measured by each observation point and the energy radiated by adopting the traversal search method, and determining the grid pointwith the minimum fitting error as a point where an interference source is located. According to the method disclosed by the invention, a region of interest can be divided into a plurality of grids, the smaller the grids are, the higher the precision is, and moreover, the calculated amount is larger, so that the positioning precision can be greatly improved on the basis of the existing RSSI positioning method.
Owner:中国电波传播研究所 +1

Rectangular open magnetic field type low-frequency vibration calibration table with double-magnetic-circuit two-end symmetric excitation

The invention provides a rectangular open magnetic field type low-frequency vibration calibration table with double-magnetic-circuit two-end symmetric excitation, belonging to the field of vibration measurement technology. A rectangular open magnetic field type magnetic circuit structure is provided. Two permanent magnets are symmetrically installed at two ends of a center magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The strong magnetic field distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. The organic integration design of air lubricated guide technology is employed, and outstanding electromagnetic drive mechanical performance and high movement guide precision are obtained at the same time. According to the rectangular open magnetic field type low-frequency vibration calibration table, large stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and the high performance low frequency vibration calibration table is provided for low-frequency / ultra-low frequency vibration calibration.
Owner:HARBIN INST OF TECH

Double-magnetic-circuit symmetrically-excited cylindrical enclosed magnetic-field-type electromagnetic shake table magnetic circuit structure capable of realizing magnetic field tracking compensation

A double-magnetic-circuit symmetrically-excited cylindrical enclosed magnetic-field-type electromagnetic shake table magnetic circuit structure capable of realizing magnetic field tracking compensation belongs to the technical field of vibration measurement. A cylindrical enclosed magnetic field structure is provided, two cylindrical permanent magnets are symmetrically installed on two ends of a central magnet yoke, and same magnetic poles are arranged in an opposite manner; two symmetrical enclosed magnetic circuits are formed through magnet yokes, the magnetic induction intensity high in uniformity is generated in an air gap; the surface, adjacent to the air gap, of the magnet yoke is provided with an array-type microstructure arranged in a deep channel mode, and the eddy current loss can be effectively inhibited; and a central magnet yoke is provided with a compensation coil, a provided current is opposite to the current in a working coil in direction and is proportional to the current in the working coil in phase synchronous tracking and amplitude, and a formed compensation magnetic field is capable of carrying out synchronous tracking compensation on the influences of an armature reaction. According to the invention, a large stroke, high magnetic field uniformity, a large thrust and linear electromagnetic driving force characteristics can be considered at the same time, and a high-precision and large-stoke electromagnetic shake table magnetic circuit structure technical scheme is provided for low-frequency/ultralow-frequency vibration calibration.
Owner:HARBIN INST OF TECH

Three-dimensional structure TM010-lambda/4 millimeter wave resonator based on silicon technology

The invention discloses a three-dimensional structure TM010-lambda/4 millimeter wave resonator based on the silicon technology. Two output ends a, b of two active circuits are connected with two open ends of the corresponding lambda/4 resonator at the juncture between a silicon substrate layer and an encapsulated layer; two short circuit ends of the lambda/4 resonator is connected with a cylindrical waveguide resonator on a first electrical conduction metal plate and realizes the energy coupling by a groove joint on the first electrical conduction metal plate; a rectangular waveguide is assembled between the first electrical conduction metal plate and a second electrical conduction metal plate; a rectangular wall of the rectangular waveguide is intersected with the outer wall of the cylindrical waveguide; the intersecting common part is removed so as to realize the energy coupling of the rectangular waveguide and the cylindrical waveguide. The resonator is suitable for being realized on the encapsulated layer based on the silicon technology; the coupling between a passive circuit, a power source and a signal wire on the silicon chip is small; the dissipation influence of the silicon chip is small; and simultaneously the TM010-lambda/4 millimeter wave resonator obtains the power output which is higher by one order of magnitude than that the traditional lambda/4 resonator; therefore the TM010-lambda/4 millimeter wave resonator has the using value in a millimeter wave integrated circuit based on the silicon technology.
Owner:ZHEJIANG UNIV

Device for separating and extracting virus in water and method for extracting sapovirus in water

The invention relates to a device for separating and extracting a virus in water and a method for extracting sapovirus in water and belongs to the field of extraction of viruses in the water. The invention aims at solving the technical problem that the existing microbiological filter can leak the air easily and provides a method for extracting the sapovirus in the water with high extraction efficiency, less product extraction interference and extracted product applicable to multiple detecting platforms. The device for separating and extracting the virus in the water is characterized in that a storage tank is provided with a dome, an arc-shaped throat is formed in the dome, an edge rolling outside is formed at the bottom of a top cover, the top cover is inserted inside from the arc-shaped throat and is blocked in the arc-shaped throat by virtue of a sealing ring, lugs are symmetrically arranged at the top of the top cover, a lever is respectively arranged in each lug, a water outlet pipe penetrates through the dome to be inserted into the bottom of the storage tank, the air inlet pipe is connected with a nitrogen pressure tank, the water outlet pipe is connected with a filter, and the filter is connected with a filter membrane support. The method for extracting the sapovirus in the water comprises the following steps: filtering a water sample, eluting with a beef extract solution, treating by adopting an isoelectric point sedimentation method and then centrifuging, remelting and carrying out secondary concentration, and then extracting nucleic acid, so that extraction of the sapovirus is completed. The device and method provided by the invention are used for separating and extracting the virus in the water.
Owner:INST OF MICROBIOLOGY HEILONGJIANG ACADEMY OF SCI

Electromagnetic shielding structure of giant hydro-generator in strong electromagnetic environment

The invention provides a new type of electromagnetic shielding structure under the strong electromagnetic environment of a giant hydro-generator, which includes multi-layer silicon steel sheets and a layer of aluminum plates that are stacked and laminated in parallel; the multi-layer silicon steel sheets and a layer of aluminum plates are sequentially stacked and fixedly connected An integrated shielding structure is formed; multiple channel steels are evenly arranged on the surface of the machine pit wall opposite to the copper bar, and the shielding structure is arranged parallel to the machine pit wall and fixedly connected with the channel steel; the silicon steel sheet is close to the machine pit wall, and the aluminum plate is close to the Copper row; silicon steel sheet builds an ultra-high magnetic permeability path within the space of the leakage magnetic field, changing the distribution of the spatial magnetic field, so that the magnetic flux leakage that intentionally enters the steel bar enters the silicon steel sheet; the magnetic field line passes through the aluminum plate vertically and enters the silicon steel sheet. Induced current, the induced current also generates reverse magnetic flux leakage, which offsets the magnetic flux leakage generated by the original copper bar. The invention is used to prevent the overheating of the reinforced concrete structure in the wall of the machine pit caused by the strong electromagnetic environment, and the reduction of the structural strength caused by the overheating.
Owner:CHANGJIANG SURVEY PLANNING DESIGN & RES

Backlight driving circuit and display device

The invention relates to the technical field of display, and discloses a backlight driving circuit and a display device.The display device comprises the backlight driving circuit, the backlight driving circuit is provided with a control unit to compare working current of a backlight plate with set current, and when the working current is smaller than the set current, the ratio of the sampling voltage to the backlight driving voltage output by a power supply module is controlled to be reduced, so that the backlight driving voltage output by the power supply module can be improved through a feedback output loop of the power supply module, the driving capability to the backlight plate is improved, the working current of the backlight plate is improved to a set value, and the backlight brightness is adjusted to be consistent with an ideal set value; the display effect is improved.
Owner:KUSN INFOVISION OPTOELECTRONICS

A rectangular open magnetic field low-frequency vibration calibration table with symmetrical excitation at both ends of the double magnetic circuit

The invention provides a rectangular open magnetic field type low-frequency vibration calibration table with double-magnetic-circuit two-end symmetric excitation, belonging to the field of vibration measurement technology. A rectangular open magnetic field type magnetic circuit structure is provided. Two permanent magnets are symmetrically installed at two ends of a center magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The strong magnetic field distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. The organic integration design of air lubricated guide technology is employed, and outstanding electromagnetic drive mechanical performance and high movement guide precision are obtained at the same time. According to the rectangular open magnetic field type low-frequency vibration calibration table, large stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and the high performance low frequency vibration calibration table is provided for low-frequency / ultra-low frequency vibration calibration.
Owner:HARBIN INST OF TECH

Oven

PendingCN112971544AEnhance effect and tasteSpeed up cookingRoasters/grillsChemistryMouthfeel
The invention provides an oven. The oven comprises a processing cavity used for containing objects to be processed, a heating pipe arranged in the processing cavity and used for generating heat, and a stone plate arranged in the processing cavity and used for storing and conducting heat, wherein the heating pipe is at least partially embedded in the stone plate and is in direct contact with the stone plate. The oven is advantaged in that the stone plate is used as one wall surface of the oven, and the stone plate has high specific heat capacity and absorption capacity, so after sufficient heat is absorbed through preheating, the influence of the door body position of the oven on heat loss can be reduced, stable environment temperature is provided for food, the effect and taste of the food baked by the oven are improved, and the cooking speed of the food is increased.
Owner:QINGDAO HAIER SMART TECH R & D CO LTD +1

TE011-lambada/4-pi mode resonator with three-dimensional structure

The present invention discloses a TE011-lambda / 4-pi mode resonator with a three-dimensional structure. Two output ends of each active circuit are connected with two open-circuit ends corresponding to the lambda / 4 resonator at the junction of a silicon chip layer and a packaging layer; two short-circuit ends of each lambda / 4 resonator are connected with TE011 cylindrical wave guide resonator on a first conducting metal plate, and realize energy coupling with a cylindrical wave guide coupling groove seam by the lambda / 4 resonator of the first conducting metal plate; a rectangular wave guide is assembled above a second conducting metal plate, and the two short-circuit ends of each lambda / 4 resonator realize energy coupling with the cylindrical wave guide coupling groove seam by the rectangular wave guide of the second conducting metal plate, and output energy. The TE011-lambda / 4-Pi mode resonator is suitable for power synthesis of silica-based Terahertz sources at the surface of the packaging layer, a passive circuit is separated from the active circuit, the quality factors of the resonator are higher, scale production can reduce the cost obviously, and the TE011-lambda / 4-Pi mode resonator has application values in the fields of Terahertz personal wireless communication, low-power radars and the like.
Owner:ZHEJIANG UNIV

Magnetic field tracking and compensation double permanent magnet tube symmetrical excitation at both ends Cylindrical closed magnetic field type electromagnetic vibrating table magnetic circuit structure

The invention provides a double-permanent-magnetic-tube two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure with magnetic field tracking compensation, belonging to the field of vibration measurement technology. A cylindrical closed type magnetic field structure design is provided. Two permanent magnet tubes are symmetrically installed and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The magnetic induction intensity distribution with high uniformity is generated in air gaps. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. A center magnet yoke is provided with a compensation coil, the direction of the current is opposite to that in a working coil, phase tracking is synchronized, amplitudes are proportional, and a formed compensation magnetic field can carry out synchronous tracking compensation on the influence of an armature reaction. According to the double-permanent-magnetic-tube two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure, large stroke, high magnetic field uniformity, high thrust and a linear electromagnetic driving force characteristic can be considered, and a high precision and large stroke electromagnetic vibration table magnetic circuit structure technical scheme is provided for low-frequency / ultra-low frequency vibration calibration.
Owner:HARBIN INST OF TECH

Device and method for smelting iron by low-grade limonite ore

The invention discloses a device and method for smelting iron by low-grade limonite ore. The device comprises a hot blast furnace, an ore roasting furnace, a lime stone calcining furnace and a blower, wherein the ore roasting furnace and the lime stone calcining furnace are respectively arranged at the left side and the right side of the hot blast furnace; the upper part of the gas burning chamber of the hot blast furnace is connected with the lime stone calcining furnace through a high-temperature flue gas channel; and the top of the hot blast furnace is connected with the ore roasting furnace through a waste heat flue gas channel. In the method, the gas in the gas burning chamber and the air sucked into an air inlet and a furnace charge adding port are mixed and burnt, the generated high-temperature flue gas heats the air in a heated air pipe, and partial high-temperature flue gas is sucked into the lime stone calcining furnace through the high-temperature flue gas channel to calcine the lime stone; and residual waste heat flue gas rises to the top of the hot blast furnace, the temperature of the waste heat flue gas is 750-850 DEG C, and the waste heat flue gas is sucked into the ore roasting furnace through a waste heat flue gas channel to dry and roast the ore. In the invention, the limonite ore which is widely distributed in the natural world and has low smelting value can be used for smelting iron with low cost.
Owner:徐建军

Three-dimensional structure TM010-lambda/4 millimeter wave resonator based on silicon technology

The invention discloses a three-dimensional structure TM010-lambda / 4 millimeter wave resonator based on the silicon technology. Two output ends a, b of two active circuits are connected with two open ends of the corresponding lambda / 4 resonator at the juncture between a silicon substrate layer and an encapsulated layer; two short circuit ends of the lambda / 4 resonator is connected with a cylindrical waveguide resonator on a first electrical conduction metal plate and realizes the energy coupling by a groove joint on the first electrical conduction metal plate; a rectangular waveguide is assembled between the first electrical conduction metal plate and a second electrical conduction metal plate; a rectangular wall of the rectangular waveguide is intersected with the outer wall of the cylindrical waveguide; the intersecting common part is removed so as to realize the energy coupling of the rectangular waveguide and the cylindrical waveguide. The resonator is suitable for being realized on the encapsulated layer based on the silicon technology; the coupling between a passive circuit, a power source and a signal wire on the silicon chip is small; the dissipation influence of the silicon chip is small; and simultaneously the TM010-lambda / 4 millimeter wave resonator obtains the power output which is higher by one order of magnitude than that the traditional lambda / 4 resonator; therefore the TM010-lambda / 4 millimeter wave resonator has the using value in a millimeter wave integrated circuit based on the silicon technology.
Owner:ZHEJIANG UNIV

Water virus separation and extraction device and method for extracting Sapporo virus in water

The invention relates to a device for separating and extracting a virus in water and a method for extracting sapovirus in water and belongs to the field of extraction of viruses in the water. The invention aims at solving the technical problem that the existing microbiological filter can leak the air easily and provides a method for extracting the sapovirus in the water with high extraction efficiency, less product extraction interference and extracted product applicable to multiple detecting platforms. The device for separating and extracting the virus in the water is characterized in that a storage tank is provided with a dome, an arc-shaped throat is formed in the dome, an edge rolling outside is formed at the bottom of a top cover, the top cover is inserted inside from the arc-shaped throat and is blocked in the arc-shaped throat by virtue of a sealing ring, lugs are symmetrically arranged at the top of the top cover, a lever is respectively arranged in each lug, a water outlet pipe penetrates through the dome to be inserted into the bottom of the storage tank, the air inlet pipe is connected with a nitrogen pressure tank, the water outlet pipe is connected with a filter, and the filter is connected with a filter membrane support. The method for extracting the sapovirus in the water comprises the following steps: filtering a water sample, eluting with a beef extract solution, treating by adopting an isoelectric point sedimentation method and then centrifuging, remelting and carrying out secondary concentration, and then extracting nucleic acid, so that extraction of the sapovirus is completed. The device and method provided by the invention are used for separating and extracting the virus in the water.
Owner:INST OF MICROBIOLOGY HEILONGJIANG ACADEMY OF SCI

Novel electromagnetic shielding structure of giant hydro-generator in strong electromagnetic environment

The invention provides a novel electromagnetic shielding structure of a giant hydro-generator in a strong electromagnetic environment. The novel electromagnetic shielding structure comprises multiplelayers of silicon steel sheets and a layer of aluminum plate which are overlapped and laminated in parallel, the multiple layers of silicon steel sheets and the layer of aluminum plate are sequentially laminated and fixedly connected to form an integrated shielding structure; multiple pieces of channel steel are uniformly arranged on the surface of the pit wall opposite to a copper bar, and the shielding structure is parallel to the pit wall and is fixedly connected with the channel steel; the silicon steel sheets are close to the pit wall, and the aluminum plate is close to the copper bar; the silicon steel sheets construct an ultrahigh magnetic conduction path in the space range of the leakage magnetic field, and the distribution of the space magnetic field is changed, so that the leakage flux intentionally entering the reinforcing steel bar enters the silicon steel sheets; and magnetic lines of force vertically penetrate through the aluminum plate to enter the silicon steel sheets,current is induced in the aluminum plate, and the induced current also generates reverse magnetic flux leakage to counteract magnetic flux leakage generated by the original copper bar. The novel electromagnetic shielding structure is used for preventing the conditions of overheating caused by a reinforced concrete structure in the pit wall in the strong electromagnetic environment, structural strength reduction caused by the overheating and the like.
Owner:CHANGJIANG SURVEY PLANNING DESIGN & RES
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