136results about How to "Increase the transmission path" patented technology

In an embodiment, a method for calculating PIM associated with a DUT comprises obtaining a first measurement of PIM with the DUT connected to the measuring instrument, introducing a shift in a phase offset of PIM produced at the DUT in response to test signals generated by the measuring instrument, obtaining, upon introducing the shift, a second measurement of PIM with the DUT connected to the measuring instrument and calculating the PIM associated with the DUT based on the first measurement and the second measurement.

The invention belongs to the technical field of lithium ion batteries and relates to a method for preparing a flexible three-dimensional solid electrolyte membrane. The method comprises the followingsteps: adding nano fibers into a solvent to prepare nano fiber suspension; adding lithium-ion conductive ceramic particles into the nano fiber suspension, stirring at high speed, and performing freezedrying so as to obtain a ceramic particle/nano fiber three-dimensional porous composite scaffold; adding lithium salt into an acetonitrile solution of polyethylene oxide, and stirring at high speed so as to obtain a lithium salt-polyethylene oxide mixed solution; soaking the ceramic particle/nano fiber three-dimensional porous composite scaffold into the lithium salt-polyethylene oxide mixed solution, drying and performing hot-pressing treatment, thereby obtaining the flexible three-dimensional solid electrolyte membrane. According to the method disclosed by the invention, the lithium-ion conductive ceramic particles are uniformly attached onto the nano fibers to form the three-dimensional porous scaffold, so that the transmission path of lithium ions in a polymer matrix is lengthened, and the solid composite electrolyte membrane has high ionic conductivity, excellent electrochemical stability and flexibility at room temperature.

The invention provides a manufacturing method for a positive electrode of an all-solid-state lithium battery. The manufacturing method comprises the following steps: step 1, providing a mixed pressed active pole piece, putting the active pole piece and sulfide in a vacuum sealed tube, carrying out heat treatment at a temperature of 200 to 1000 DGE C for 1 to 20 h and then carrying out slow cooling to room temperature so as to obtain a sublimated positive plate; and step 2, placing the positive plate on a current collector coated by a conducting adhesive and carrying out cold pressing and drying so as to prepare the positive electrode. The invention further relates to the positive electrode prepared by using the method. The all-solid-state lithium ion battery prepared by using the method provided by the invention has the following advantages compared with traditional all-solid-state lithium batteries: since gaps among solid-solid particles of the battery are filled with amorphous sulfide exerting connection and bridging effects, contact areas of the solid-solid particles of the battery are substantially improved, lithium ion transport paths are increased, and thus, conductivity is improved, internal resistance of the battery is reduced, and energy density and rate capability of the battery are enhanced.

The present invention provides a base station antenna unit and a base station antenna. The base station antenna unit includes an integrally formed non-metal structure and a metal pattern formed on the non-metal structure through an LDS (laser direct shaping) or LEP (laser enhanced plating) process, wherein the non-metal structure comprises at least a non-metal substrate, and the metal pattern at least comprises vibrator arms, coupling metal strips and metallized through holes, wherein the vibrator arms are formed at the front surface of the non-metal substrate, the coupling metal strips are formed at the back surface of the non-metal substrate, and the metallized through holes are formed at the connection through holes of the vibrator arms and are connected with the vibrator arms. The base station antenna unit has the advantages of light weight, high surface accuracy and high production consistency.

The invention relates to an adjustable band-gap thin-film solar cell based on a glass substrate and a fabricating method thereof. The invention is characterized in that materials with different band-gap structures are adopted as the absorbing layers such as Alpha-SiC, Alpha GexSi1-x, Mu-Si, and the like, so that a three-section structure is formed, thereby the light energy trapping is enhanced; different band gaps can be obtained by adopting a method for adjusting the proportion of ingredients of Ge and Si of an intrinsic layer, thereby the light energy absorption is enhanced; the energy consumption of process processing is less by adopting the PECVD (plasma enhanced chemical vapor deposition) film forming; the series connection in the cells is realized by laser scribing, the photolithographic process is not required, and the invention is suitable for batch production.

The invention discloses a transformer with a high set-up ratio, a solar inverter and a solar battery system. According to the invention, the low output voltages of power sources are converted to high output voltages through the transformer with the high set-up ratio; and according to the specific application and different control methods, the outputs of the transformer with the high set-up ratio from a first technical scheme to a fourth technical scheme can be standard direct current voltages or controlled and modulated specific voltage wave forms. By using the transformer with the high set-up ratio, the solar inverter and the solar battery system, the defects of small set-up ratio, long transmission path, large additional loss, low energy conversion efficiency and the like in the prior art can be overcome, so as to realize the advantages of large set-up ratio, short transmission path, small additional loss and high energy conversion efficiency.

The invention discloses a preparation method of high-electromagnetic-shielding-effectiveness full-biomass-based carbon aerogel. The required raw materials comprise cellulose. The method comprises thefollowing steps of raw material drying, preparation of a cellulose solution, preparation of cellulose aerogel and preparation of carbon aerogel. According to the method, celluloses is used as a precursor, through dissolution regeneration, cosolvent treatment and freezing drying, a three-dimensional continuous opening sheet layered grid structure of the cellulose aerogel is regulated and controlled, the stable and excellent electric conduction network (592.3 S/m) is constructed through high-temperature carbonization, and the efficient electromagnetic shielding performance (106.3 dB) of the carbon aerogel is achieved. The carbon aerogel has a wide precursor source and is environmentally friendly, a solvent system is nontoxic and low in price, the material preparation process is simple, the technology is easy to control, the production cost is low, and the carbon aerogel has high potential of large-scale production.

The invention discloses a porous layer structure perovskite solar battery and a preparation method thereof. The porous layer structure perovskite solar battery comprises a substrate, a compact layer, a porous layer, a light absorption layer, a hole transport layer and a metal electrode layer which are stacked sequentially. The novel porous layer is used, that is, the porous layer is prepared by utilizing mixture of an upconversion material with NaYF4 as the matrix and TiO2 nano-particles. The upconversion material can absorb near-infrared light and emit visible light. The porous material not only can increase electronic transmission paths and reduce recombination of electron hole pairs, but also can effectively improve the number of photons absorbed by a perovskite film layer. The preparation method has the advantages of being simple in process, good in controllability and high in coordination.

The invention discloses a preparation method of an inorganic trans-perovskite solar cell based on quantum dot modification. The preparation method comprises the following steps: (1) washing transparent FTO conducting glass; (2) preparing a CuOx inorganic hole transport layer; (3) preparing an inorganic perovskite/quantum dot composite film on the inorganic hole transport layer as a light absorption layer and an electron transport layer of the device together; and (4) enabling the inorganic perovskite/quantum dot composite film to be covered with a counter electrode so as to obtain the inorganic trans-perovskite solar cell based on quantum dot modification. The light absorption layer is prepared from quantum dots with light absorption capacity and an inorganic perovskite light absorption material together, so that the utilization rate of sunlight is improved, the quantum dots are used as the electron transport layer while the charge extraction capacity of the device is improved, and thepreparation technology is simplified; and moreover, the inorganic perovskite crystal structure and film-forming property are improved through partial doping of the quantum dots, so that the stabilityof the device is improved, and the transportation and separation of carriers are further accelerated while the charge recombination is reduced effectively.

The invention discloses a differential dual-frequency band-pass filter with high selectivity. By the differential dual-frequency band-pass filter with high selectivity, the problem of poor out-of-bandselectivity in design of the differential dual-frequency band-pass filter is solved. A first uniform impedance resonant ring, a second uniform impedance resonant ring, an input microstrip line and anoutput microstrip line are arranged on an upper surface of a dielectric substrate, the first uniform impedance resonant ring and the second uniform impedance resonant ring are embedded to each other,the input microstrip line and the output microstrip line are symmetric to each other, and a step impedance gap line comprising a central loading branch is arranged on a lower surface. L-shaped open-circuit branches are loaded on the input/output microstrip lines, the central loading branch of the gap line passes through a projection line of a center of the dual-frequency band-pass filter and is arranged at the center of a T-shaped gap line, and the dual-frequency band-pass resonator is of a folded and embedded structure. By adding a transmission zero point mode, the frequency selectivity is improved, the space utilization rate and the integration are effectively improved, the design complexity is reduced, and the differential dual-frequency band-pass filter has the advantages of small introduction noise, high interference-resistant capability and small loss and is widely applied to a mobile wireless communication system.

The invention provides a core-shell self-repairing fiber bead type electrospinning material based on pH response and a synthesis method and application thereof, and belongs to the technical field of polymer chemistry. A shell solution synthesized by the method is mainly composed of a polymer shell material, a shell material template agent, a shell material solvent, a crosslinking agent and a catalyst which are mixed according to a mass ratio of 1:(0.1-2):(5-30):(0.2-5):(0.075-1); a core solution is mainly composed of a core material and a core material solvent; the parameters such as a feedingsequence, a heating temperature range, a stirring speed and reaction time are optimized. An electrospinning synthesis process adopts a coaxial spinning method to optimize parameters such as voltage,liquid outflow speed and receiver moving speed during electrospinning. The synthesized fiber bead structure can effectively increase the drug loading amount, also has pH sensitivity, can achieve a pHresponse self-repairing function of a local region of a coating, and has wide application prospects in the field of self-repairing anti-corrosion coatings.

The invention relates to a preparation method of a hierarchical micro-nano structure ZnO electrode material of a dye-sensitized solar cell; the ZnO electrode material with a hierarchical micro-nano structure is prepared by thermal reaction of a solvent. Zinc acetate and diols are poured into an autoclave according to the proportion of 0.01-1mol/L, the heating is carried out to 120-250 DEG C, the stirring reaction is carried out for 1-24 hours, and the centrifugal separation, the washing and the drying are carried out after the natural cooling to the room temperature, thereby obtaining hierarchical micro-nano structure ZnO powder. The obtained micro-nano structure ZnO electrode material is arranged in ethanol, slurry is prepared by ultrasonic dispersion, then a thin film with the thickness of 1-20um is coated on a conductive substrate by the coating method, the ZnO electrode material is arranged in 0.1-1mol/L photosensitizer solution at 80 DEG C for soaking for 0.5-8 hours after the drying, the ZnO electrode material is taken out, and the ethanol is used for completely removing the excess photosensitizer by washing, thereby obtaining a working electrode of the dye-sensitized solar cell.

The present disclosure discloses an MXene-based terahertz wave broadband super-strong absorbing foam, and belongs to the technical field of electromagnetic functional materials. The MXene-based terahertz wave broadband super-strong absorbing foam includes a porous polymer foam and a MXene nanosheet attached onto the porous polymer foam, wherein the MXene nanosheet is attached onto the porous polymer foam in a coating form, a film forming form and a suspension form; the average pore diameter of the porous polymer foam ≥500 μm, the thickness of the porous polymer foam ≤10 mm, and the filling mass of the MXene nanosheet is less than 50% of the mass of the absorbing foam.

A bend sensor includes a flexible circuit substrate, an insulation pad and a flexible conductive substrate. The flexible circuit substrate includes an insulating body, a first circuit and a second circuit. The first and second circuits are disposed on opposing sides of the insulating body. The first circuit has first fingers, while the second circuit has second fingers. The insulation pad disposed on the insulating body exposes the first and second fingers. The flexible conductive substrate disposed on the insulating pad has a conductive layer separated from the first fingers and the second fingers. While the bend sensor is bent, the conductive layer on the flexible conductive substrate would deform toward the flexible circuit substrate so as to form multiple contacts with the first and second fingers. Through these contacts, a number of resistors are formed to contribute a detectable resistance for the corresponding bending amplitude to be further realized.

The invention provides a graphene oxide nano filtration membrane prepared by blending and reducing layered MoS2 nano sheets and a preparation method thereof, belongs to the technical field of nano filtration membrane separation, and relates to a MoS2-rGO/PVDF nano filtration composite membrane prepared in a physical blending mode and a vacuum filtration method and a preparation method thereof. According to the method, the MoS2 nano sheets are prepared by a liquid phase ultrasonic peeling method, the obtained product is quantitatively added into a reduced graphene oxide solution by adopting a blending mode, and then vacuum filtration is carried out on a polyvinylidene fluoride porous bottom membrane to prepare the composite membrane. The method is simple in preparation process, and when themethod is used for organic dye water system separation, the water flux is remarkably increased, and the rejection rate is high. Because the interlayer spacing of the traditional reduced graphene oxide separation membrane is narrow, the method well solves the problem of low water flux caused by small interlayer spacing of the separation membrane, effectively enhances the water flux and selectivityof the nano filtration membrane, and has wide application prospects.

The invention discloses an IP header compression consultation disposal in a wireless LAN, which comprises: an IP header compression request is sent out to a wireless access point by a terminal according to the parameter, which starts up the operation of the IP header compression. The wireless access point, which receives the IP header compression request, disposes the IP header compression request with a network configuration according to the content of the request; makes sure a target network entity; sends an IP header compression instruction to the target network entity or transmits the IP header compression request to the target network entity. The network received the IP header compression instruction answers the IP header compression disposing result. And the result is returned to the terminal by the wireless access point. With the invention, the transmission path of a compressed IP data can be maximally prolonged; the delay in the transmission path is reduced; the ratio of a load in the transmission path is increased; the transmission quality of the operation, which is sensitive to the delay, is enhanced; the unified distribution of a whole can be realized; and the mess in the processes of IP header compressing and recovery is avoided.

The invention discloses a composite solid electrolyte film based on NASICON type electrolyte and a preparation method thereof. The invention belongs to the field of all-solid-state lithium batteries.The objective of the invention is to solve technical problems of poor compatibility between a rigid inorganic solid electrolyte and an electrode interface, too low ionic conductivity of a polymer-based solid electrolyte, and large room-temperature polarization and operation at a high temperature of an LATP-based all-solid-state lithium battery with a polymer interface layer in the prior art. The product is prepared from NASICON type solid electrolyte powder, a polymer and a lithium salt through a solution casting method. The method comprises the following steps: 1, adding solid electrolyte powder, a polymer and a lithium salt into a solvent, and performing stirring to form a uniform slurry; 2, coating a glass plate substrate with the slurry, and performing drying to obtain a composite solid electrolyte film; and 3, infiltrating the composite solid electrolyte film in an electrolyte, sucking the electrolyte on the surface of the electrolyte film, and performing vacuum drying to obtain the composite solid electrolyte.

The invention provides a double-helix threshing and conveying system and a combine harvester. The double-helix threshing and conveying system comprises two threshing spaces which are horizontally arranged in the advancing direction of the harvester at intervals front and back, each threshing space is a hollow cylindrical mounting cavity defined by a concave plate screen and a cylinder cover, and a roller is mounted in each mounting cavity. Guiding pieces are arranged on the inner wall faces of the cylinder covers at intervals and used for guiding crops entering the threshing spaces to move directionally around the axis, the rollers drive the crops to move when rotating and enters the second threshing space from the first threshing space through guiding of the guiding pieces, and therefore the lengths of working areas of the two threshing spaces are the same. Therefore, a crop threshing path passes through the length of two rollers and can fully thresh crops. The two threshing spaces are horizontally arranged in a spaced manner, so that the structure on the rack is more compact, the lengths of the two threshing working areas are the same, the threshing path long enough can be guaranteed, and the threshing effect is fully guaranteed while the overall maneuverability of the harvester is guaranteed.

The invention discloses an atomizer and an electronic atomization device thereof. The atomizer comprises a shell, a mounting seat and an atomizing core, wherein the shell is provided with a liquid storage cavity, a mounting cavity and an air outlet channel; the mounting seat is at least partially accommodated in the mounting cavity; and the atomizing core is mounted in the mounting seat, the atomizing core is communicated with the liquid storage cavity, the atomizing surface of the atomizing core is opposite to the air outlet channel and is arranged at an interval with the air outlet channel, and an atomizing cavity is formed between the atomizing core and the air outlet channel. According to the invention, a first air inlet part and a second air inlet part are arranged on the two sides of the atomizing cavity, and two air flows entering through the first air inlet part and the second air inlet part form an air flow driving aerosol to spirally rise along the inner wall of the air outlet channel above the atomizing surface, so that the air flow carrying the aerosol is in full contact with the inner wall of the air outlet channel, the transmission path of the aerosol is prolonged, more large liquid drops in the aerosol are attached to the inner walls of the atomizing cavity and the air outlet channel, and the content of the large liquid drops at the outlet of the atomizing cavity is reduced.

The invention provides a preparation method of a sodium vanadium fluorophosphate positive electrode material. The preparation method comprises the following steps: mixing a vanadium source, a phosphorus source, a sodium source, a fluorine source and an organic reducing agent to prepare a solution, carrying out spray pyrolysis to obtain Na3V2(PO4)2F3 microspheres, and carrying out mechanical ball milling on the Na3V2(PO4)2F3 microspheres and a carbon material to obtain a well-crystallized Na3V2(PO4)2F3/C material. Compared with the traditional ball milling method, the spray pyrolysis-mechanicalball milling method adopted by the invention has the advantages of high material synthesis speed, low energy consumption, high yield, simple process, easiness in operation and the like, and avoids the long-time sintering process of the raw materials at high temperature. The obtained Na3V2(PO4)2F3 microspheres and the final Na3V2(PO4)2F3/C material have spherical morphology and are relatively small in particle size. The prepared Na3V2(PO4)2F3/C material passes an electrochemical performance test, has relatively good specific discharge capacity, and has a relatively good application prospect ina sodium-ion battery positive electrode material.

The invention discloses a floor structure which can improve the isolation between antennas. A plurality of upper crenels and lower crenels with identical structures are arranged on the floor, the widths of the upper crenels and the lower crenels are equal, and a lower crenel is arranged between two adjacent upper crenels; conversely an upper crenel is arranged between two adjacent lower crenels; and a transmitting microstrip antenna and a receiving microstrip antenna are respectively connected with both ends of the floor. The floor structure improves the electromagnetic interference between airborne antennas. The method prolongs the transmission path of the electromagnetic wave between interference antennas, increases the attenuation loss of the electromagnetic wave, and can basically improve the isolation between the antennas in the acceptable antenna radiation characteristic distortion range.

The invention discloses an alarm system which comprises an information acquisition module, an alarm controller capable of receiving and processing alarm information output by the information acquisition module, a voice alarm module capable of transmitting alarm information processed by the alarm controller to the public switched telephone network (PSTN), a wireless transmission module capable of transmitting the alarm information processed and output by the alarm controller to the wireless network, a voice receiving module connected with the voice alarm module, a wireless receiving module connected with the wireless transmission module, and an alarm receiving platform connected with the voice receiving module and the wireless receiving module and capable of receiving the processed alarm information and giving an alarm. According to the alarm system, the two transmission routes which are the PSTN and the wireless network are both used for transmitting the alarm information to the alarm receiving platform, and therefore accurate, effective and timely transmission of the alarm information to the alarm receiving platform is achieved, and safety and stability of the alarm system are improved. The invention further discloses an alarm information transmission method.