384 results about "Membrane bodies" patented technology

An iontophoresis device useful for administering an ionic drug by iontophoresis has an iontophoresis electrode section (active electrode section) and a ground electrode section (inactive electrode section) both of which are to be connected to a power source. The iontophoresis device includes elements (members) of both of the electrode sections are all formed of membrane bodies, and includes ion exchange membranes different in ion selectivity, one being selective to ions of the same species as charged ions of the ionic drug and the other to ions different in species from the charged ions of the ionic drug that are arranged in the iontophoresis electrode section, and at least an ion exchange membrane selective to ions opposite to the charged ions of the ionic drug is arranged in the ground electrode section. The iontophoresis device can administer the ionic drug stably over a long period of time at high transport efficiency.

The present invention is directed to a collapsible cover for protecting an occupant in a seating unit having a head region and a foot region. The cover has a body comprised of a flexible material having a top portion and at least one side wall portion, the top portion having a generally ellipse shape and having a length to span the distance between the head region and foot region of the seating unit and a width to span the width of the seating unit. The sidewall portion is connected to the top portion along a substantial portion of the periphery of the top portion to provide an arched configuration to the top portion. The cover further has a single closed loop frame member made of a flexible, coil-able, resilient material, that is secured along the length of the structure's membrane body so as to assume an ellipse-like shape when viewed from above, that is bent into an arched configuration about its minor axis. The closed loop frame member is movable between an extended orientation to allow the cover to be attached to the seating unit and a collapsed orientation to allow for a reduced size of the cover for transport and storage and is connected to the periphery of the top portion to provide in the extended orientation an arched ellipse shape about the length of the top portion. The cover also has a means for releasably attaching the cover to a seating unit.

The invention provides a control method, device and system of a washing and sweeping vehicle. The washing and sweeping vehicle comprises a water regeneration system for filtering sewage; the water regeneration system comprises a filter screen arranged in a sewage tank of the washing and sweeping vehicle; the filter screen divides the sewage tank into an upper cavity and a lower cavity; the water regeneration system also comprises a filter membrane body arranged in the lower cavity The method comprises the following steps: a controller obtains a detection signal fed back by a sewage detection device, wherein distance between the sewage detection device and the filter membrane body is the designated distance; and the controller controls the water regeneration system to filter the sewage in the sewage tank according to the detection signal. Through the invention, the problem of water waste of the washing and sweeping vehicle is solved, and the functions of the washing and sweeping vehicle are enhanced; and the control method, device and system have great practical value and are suitable for popularization and application.

The invention belongs to the technical field of lithium-sulfur batteries, and relates to a membrane and for a lithium-sulfur battery. The membrane comprises a membrane body and a covering layer, the covering layer comprises graphene and heterojunction nano materials, the heterojunction nano materials are a symbiotic high adsorption phase-high conductivity phase, the mass ratio of the graphene to the heterojunction nano materials is (3-15):1, and the mass ratio of the high adsorption phase to the high conductivity phase is (1-10): (10-1). Relative to the prior art, according to the membrane, the covering layer is arranged on the membrane, electrochemistry and dynamics performances of the lithium-sulfur battery can be greatly improved, heterojunction nano materials specifically comprise the high adsorption phase and the high conductivity phase, the high adsorption phase has high adsorption action on polysulfide, the high conductivity phase has high conductivity action on the polysulfide, the polysulfide adsorbed by the high adsorption phase can be diffused on the surface of the high conductivity phase, so that transformation of the polysulfide is finished, adsorption and transformation at an interface between the high adsorption phase and the high conductivity phase can be finished, and the 'shuttling effect' of the polysulfide is restrained.

The invention discloses a production method of a slow-release chelated compound fertilizer containing multiple elements. The method comprises the following steps of: preparing a humic acid solution and concentrated sulfuric acid into a humic acid-sulfuric acid mixed solution of 70-90 DEG C; spraying into a rotor drum granulator for granulating together with other powdery basic fertilizers containing nitrogen, phosphorus and potassium, substances which are rich in medium and trace elements, nutrients which can be adsorbed and fixed, and ingredients which can be used for forming a coating framework and an inner membrane shell; after granulating, enveloping with liquid sodium silicate, and drying, cooling, sieving and packing to obtain a nitrogen-phosphorus-potassium slow-release chelated compound fertilizer containing organic matters and medium and trace elements such as sulfur, zinc, calcium, magnesium and silicon. The liquid sodium silicate serving as an enveloping material is added in two parts, one part is directly added into the material layer of the rotor drum granulator to increase the granulating rate and form the inner membrane shell with the viscosity, and the other part is added into the outlet of the rotor drum granulator to envelop the surfaces of granulated fertilizer particles. The processes of material granulation and fertilizer particle enveloping are completed by using the rotor drum granulator, and curing treatment of a membrane body is completed by drying and cooling without adding any special enveloping equipment, so that a large quantity of equipment investments are reduced.

The invention belongs to the technical field of battery manufacture and in particular relates to an isolating membrane for a lithium ion secondary battery. According to the isolating membrane, at least one surface of an isolating membrane body is coated with a functional coating layer; the functional coating layer is formed in a manner that inorganic particles, a binder and a polymer are mixed and stirred in a solvent to form slurry, and at least one surface or two surfaces of the isolating membrane body is / are coated with the slurry; and the coating process of the functional coating layer is controlled by adopting a process, so as to enable an inorganic particle layer to be enriched on the surface of the isolating membrane body, and the polymer to be enriched on the surfaces of the inorganic particles. The inorganic particles in the functional coating layer have the excellent heat stability, so that the shrinking of the isolating membrane under a high temperature condition is inhibited, and the heat stability of the isolating membrane is improved; and simultaneously a polymer layer enriched on the surfaces of the inorganic particles can be bonded together with electrode pieces of the lithium ion secondary battery in the lithium ion secondary battery so as to inhibit the deformation of the battery.

The invention provides a perfluorosulfonic composite proton exchange membrane for a fuel cell and a preparation method thereof. Perfluorosulfonic resin formed by perfluorosulfonic resin, M-type perfluorosulfonic resin and porous polymer enhanced materials is H-type resin with sulfonic acid groups (-SO3-) or F-type resin with sulfuryl fluoride groups (-SO2F-). The M-type perfluorosulfonic resin is cerium or / and manganese metal ion type perfluorosulfonic resin formed in a way that cerium or / and manganese ions are fully exchanged with sulfonic acid groups or sulfuryl fluoride groups in perfluorosulfonic resin. Cerium or / and manganese ions can be evenly distributed on the membrane body, the thermal stability is high, the heat treatment temperature of the composite membrane is improved, the combination of the porous polymer enhanced materials with the perfluorosulfonic resin is facilitated, the prepared composite proton exchange membrane has good mechanical strength and proton conductivity capacity, and the performance of the fuel cell is improved.

The invention discloses a laminator. The laminator comprises a lamination device and a special membrane; the lamination device comprises a shell; a first layer board and a second layer board are arranged in the shell; the bottom of the shell is provided with a first stepping motor and a first lead screw vertically coupled to the first stepping motor; the first layer board is connected to the first lead screw through a nut in a sleeving mode and provided with a fixing groove; the second layer board is provided with a second stepping motor, a second lead screw horizontally coupled to the second stepping motor and a sliding board connected to the second lead screw through threads in a sleeving mode; the sliding board is provided with a telescopic board and a third stepping motor; a membrane clamping board is arranged at the tail end of the telescopic board; the third stepping motor is coupled with a rotary rod; the tail end of the rotary rod is connected with a shifting fork; the shifting fork is provided with an idler wheel; the special membrane comprises a screen protection membrane body in the middle, an auxiliary membrane body at the bottom layer and a protection membrane body at the top layer; double-faced adhesive tape is arranged on the outer side of the front end of the auxiliary membrane body; single-faced adhesive tape is arranged on the outer side of the front end of the protection membrane body. The laminator can automatically and rapidly paste the screen protection membrane body.

The invention discloses a protection membrane and a manufacturing method, a flexible panel, a display device and a manufacturing method thereof, relating to the technical field of display and aiming to ensure stress stability and bending properties of a flexible substrate. The protection membrane is pasted to the flexible substrate, and the flexible substrate comprises a horizontal area and at least one bending area. The protection membrane is characterized by comprising a protection membrane body and at least one through hole, wherein the through hole is formed in the protection membrane; each bending area at least corresponds to one through hole; and when the protection membrane is pasted to the flexible substrate, the orthographic projection of the through hole on the flexible substratecorresponds to the bending area. The flexible panel comprises the protection membrane disclosed by the technical scheme of the invention. The protection membrane and the manufacturing method thereof,the flexible panel and the manufacturing method thereof, and the display device disclosed by the invention are applied to flexible display.

A chip membrane-cutting device is provided with a membrane-punching upper seat, a membrane-punching lower seat, a membrane-out unit, a membrane-receiving unit and a bearing unit, wherein, the membrane-punching upper seat is provided with a plurality of upper tool holders, the membrane-punching lower seat is provided with a plurality of lower tool holders, and the inner diameter of the lower tool holder is less than or equal to the diameter of a chip; the membrane-out unit and the membrane-receiving unit are respectively arranged at the two sides of the membrane-punching upper seat and the membrane-punching lower seat, thereby leading the membrane body to be rightly arranged between the membrane-punching upper seat and the membrane-punching lower seat; the upward side of the membrane-punching upper seat is provided with an adsorption disk corresponding to the upper and lower tool holders; the inner side of the adsorption disk is provided with at least one pre-paste unit, so the efficacy for cutting a membrane body with the area less than or equal to that of the chip is reached, a plurality of membrane bodies can also be simultaneously cut, and thus the efficacy for changing the cutting size can be achieved.

The invention discloses a geomembrane gas inflation test device, belonging to the field of hydraulic engineering. The geomembrane gas inflation test device comprises an on-geomembrane equipment container and a below-geomembrane equipment container communicated with the on-geomembrane equipment container, wherein a geomembrane body material to be tested is located between the on-geomembrane equipment container and the below-geomembrane equipment container and used for separating a channel, the on-geomembrane equipment container internally stores upper media for simulating an on-geomembrane environment, the below-geomembrane equipment container is filled with lower media for simulating a below-geomembrane environment, and the bottom of the on-geomembrane equipment container is provided witha first pipe valve interface communicated with a testing system and a second pipe valve interface communicated with a test water source supply device; the bottom of the below-geomembrane equipment container is provided with a third pipe valve interface communicated with the testing system and a fourth pipe valve interface communicated with a drainage system; and a top cover is provided with an air exhaust or water drainage valve. The geomembrane gas inflation test device can be used for conveniently carrying out a membrane material gas inflation destructive test, a membrane material air permeability test and penetration tests before and after membrane material gas inflation destruction.

The invention provides an air-permeable membrane, a diaphragm, a reactor and a sewage filtering process, belonging to the technical field of sewage treatment. The air-permeable membrane comprises a membrane body, wherein the surface of the membrane body is braided or coated with a biocompatible material for facilitating rapid adhesion and growth of microbes. The diaphragm comprises an upper head, a bottom head, a support bar arranged between the upper head and the bottom head and a plurality of the air-permeable membranes. The reactor comprises a container, a water inlet pipe and a water discharging pipe. The reactor further comprises a shaking device, an air supplying device, a supporting framework and the diaphragm, which are arranged in the container. The process comprises a microbe biomembrane formation procedure, a membrane filtration procedure and a reactor cleaning procedure. With the process, land occupation and energy consumption can be reduced, the operation cycle of the reactor can be prolonged, and cleaning frequency in a MABR process can be decreased; and a manner of combined mechanical motion and out-of-membrane aeration is employed so as to reasonably control the decrement of biomembranes and guarantee normal operation of the MABR process.

A cation exchange membrane includes: a membrane body containing a fluorine-based polymer having an ion-exchange group; and two or more reinforcing core materials arranged approximately in parallel within the membrane body. The membrane body is provided with two or more elution holes formed between the reinforcing core materials adjacent to each other. A distance between the reinforcing core materials adjacent to each other is represented by a, a distance between the reinforcing core materials and the elution holes adjacent to each other is represented by b, a distance between the elution holes adjacent to each other is represented by c, and the number of the elution holes formed between the reinforcing core materials adjacent to each other is represented by n. The relationship represented by the following expression (1) or expression (2) are satisfied:b>a / (n+1)  (1);c>a / (n+1)  (2)

Provided is a water-proof sound-transmitting member that can be separated reliably from a releasing paper when an overhanging portion of a tab is pulled. The method for producing the water-proof sound-transmitting member (2) of the present invention includes the steps of producing a laminate (52a) by laminating a first layer (71), a preliminary membrane body (61), a second layer (72), and a preliminary tab body (63) in this order; inserting a blade (90) into the laminate (52a) from the first layer (71) toward the preliminary tab body (63) to cut the first layer (71), the preliminary membrane body (61) and the second layer (72) so as to form respectively the first adhesive layer (21), the water-proof sound-transmitting membrane (11) and the second adhesive layer (22), and providing, in a surface of the preliminary tab body (63) on a side of the second layer (72), a notch (13n) that is aligned with end faces of the first adhesive layer (21), the water-proof sound-transmitting membrane (11) and the second adhesive layer (22); and cutting the preliminary tab body (63) to form the tab (13).

An ultrasonograph comprises a transmitting section (102) for driving an ultrasonic probe to transmit ultrasound to a measurement region of a subject including an artery vessel wall, a receiving section (101) for receiving reflected waves produced when the ultrasound is reflected from the subject by means of the ultrasonic probe to generate a reception signal, a movement information calculating section (110) for calculating movement information at least in the axial direction of the artery vessel wall from the reception signal, and a boundary position determining section (109) for determining the position of at least one of the blood flow-inner membrane boundary, the media-outer membrane boundary, and the outer membrane-body connective tissue boundary of the artery vessel wall in the measurement region according to the movement information.

The invention discloses a preparation method of a polymer hollow fiber membrane. The method includes the steps of: dissolving a high molecular weight polymer in a good solvent, performing extrusion molding, firstly conducting immersion in low temperature coagulation bath to form a gel membrane blank, and then performing immersion into high temperature coagulation bath to conduct curing into a membrane. The method provided by the invention utilizes the dual advantages of gel and phase separation, the polymer hollow fiber membrane has a membrane body of spongy interpenetrating network structure and the exodermis of a precise separation layer, so that the polymer hollow fiber membrane has high strength and high permeability at the same time, and has wide application space in household water purification, sewage treatment, reverse osmosis forepart pretreatment, membrane bioreactors and other fields.

The invention discloses a high-intensity damage-free type flexible roughened surface geomembrane and a producing method of the high-intensity damage-free type flexible roughened surface geomembrane, belonging to the field of production of a geomembrane. The high-intensity damage-free type flexible roughened surface geomembrane comprises a geomembrane body. The high-intensity damage-free type flexible roughened surface geomembrane is characterized in that the geomembrane body is in a monolayer calendaring membrane structure; and taper convex points are calendered on the upper surface and / or the lower surface of the membrane body. The main raw materials of the geomembrane comprise ethylene-alpha olefin copolymer, high-intensity polyethylene, high-pressure low-intensity polyethylene, antioxygen, ultraviolet light absorber and carbon black. Compared with the prior art, the high-intensity damage-free type flexible roughened surface geomembrane disclosed by the invention has the characteristics of simplicity in production technique, excellent performance index, and the like, can be widely applied to a railway anti-shock layer, a refuse landfill, a tunnel, a reservoir, a canal, a sewage treatment tank, a landscape lake and other environment-friendly anti-seepage projects, and has very good popularizing and applying values.

The invention discloses a foetal membrane device of a robot intelligent rolling and edge covering system. The foetal membrane device comprises a foetal membrane base; a foetal membrane body is mounted on the foetal membrane base; a mold is arranged at the top of the foetal membrane body; a vacuum plate is mounted at the middle part of the foetal membrane body; rolling guide positioning systems are arranged around the foetal membrane body, and include gripper locking mechanisms and outer plate guide devices; the outer plate guide devices include guide brackets; the guide brackets are fixedly mounted on the upper surface of the foetal membrane base; F-shaped connecting plates are mounted at the top ends of the guide brackets; guide cylinders are mounted at the lower ends of the F-shaped connecting plates; guide plates are mounted at the upper ends of the F-shaped connecting plates; the middle parts of the guide plates are hinged with the F-shaped connecting plates; and guide heads are embedded in the front ends of the guide plates. The foetal membrane device uses the cylinders for driving the swing arm type outer plate guide devices to perform grouping actions, finishes the workpiece positioning before workpieces are contacted with edge rolling foetal membranes, uses the vacuum plate with a larger contact area for replacing a circular vacuum sucker, is better in absorption effect, and improves the rolling operation quality.

A loudspeaker provided with a frame (101), a membrane (103) and a drive unit (105). The membrane has an outer circumferential edge (104a) suspended from the frame and an inner circumferential edge (104b). The drive unit has a stationary part (106a) secured to the frame and a translatable part (106b) provided with a coil support (108b) secured to the inner circumferential edge of the membrane. The membrane includes a membrane body (104) which, viewed in a circumferential direction, has a pattern of folds radially extending between the inner circumferential edge and the flat outer circumferential edge of the membrane. The folds have a depth (d), which increases from the edges (104a, 104b) towards an area (104A) situated between both edges. In this area, the folds are provided with faces (204C), to which a spider (111) of the loudspeaker is secured. This loudspeaker combines a small height with a large stroke of the membrane.

The invention provides a sponge gel type membrane body material comprising a hydrophilic gel membrane body, wherein a plurality of cavities are arranged inside the hydrophilic gel membrane body, and each cavity is communicated with the surface of the hydrophilic gel membrane body and / or two adjacent cavities through at least one communication channel. The invention further provides a manufacturing method of the sponge gel type membrane body material, wherein the manufacturing method comprises the following steps of A. preparing materials; B. foaming; C. forming; D. breaking bubbles; and E. cutting. According to the structure of the sponge gel type membrane body material and the manufacturing method of the material, disclosed by the invention, the sponge gel type membrane body material has excellent absorption and release functions, is rich in elasticity and toughness, and resists the extrusion and the folding; and the cost is saved.

The invention discloses a precision infusion filter membrane and a preparation method, a precision infusion filter membrane structure and a preparation process, a precision infusion filter and an infusion device. The precision infusion filter membrane comprises a membrane body, and the membrane body is made of a porous alumina material. The surface of the membrane body is provided 1 million to 1 billion filter holes per square centimeter, the diameter of the filter holes is 100 nm to 500 nm, and the depth of the filter holes is 2 to 100 micrometers. The filter membrane has the advantages of good biocompatibility, short filtration path, low filtration pressure difference, low filter membrane swelling and small adsorption of drugs, and the filter membrane surface modification is more convenient. The nano ultrafiltration infusion filtering requirements of different types of special drugs and groups like infants can be met. At the same time, the filtering particle diameter can be improvedto below 200 nm.

The invention provides an ultrafiltration membrane which comprises a base membrane body and a sulfomethylation polysulfone coating compounded on the base membrane body, wherein the base membrane body is a polysulfone membrane or a polyether sulfone membrane. A preparing method of the ultrafiltration membrane includes the steps that the base membrane body is provided, wherein the base membrane body is the polysulfone membrane or the polyether sulfone membrane; the base membrane body is coated with a solution containing sulfomethylation polysulfone to obtain the ultrafiltration membrane, wherein the solution containing the sulfomethylation polysulfone comprises the sulfomethylation polysulfone, predissolved liquid, dissolved diluent and water, the mass percent of the sulfomethylation polysulfone is 0.5-5%, the mass percent of the predissolved liquid is 3-8%, and the mass percent of the dissolved diluent is 25-50%. The ultrafiltration membrane is good in hydrophilicity, high in anti-pollution capacity and long in service life.

The invention discloses a method for preparing a super-hydrophobic mixed matrix membrane by inorganic particle induced phase separation. According to the method, inorganic particles having proper grain size and the surface carrying hydroxy and other hydrophilic radicals in a casting membrane solution system consisting of polymer / solvent / additive / inorganic particles are induced in the phase separating process under the interface interaction of particle surface functional groups and polymer chains and the like to form a micron-sized microsphere structure which takes the particles as a core, wherein polymer coats the surface. The polymer chain on the microsphere surface forms a nano-microspike structure in the phase separating curing process, so that a super-hydrophobic micro-structure with a lotus leaf-like surface is formed on the membrane surface, the microsphere extends to the membrane body from the membrane surface, the duct of the membrane body has excellent hydrophobicity due to the similar structure, and the hydrophobic stability and durability of the separation membrane can be promoted.

The invention provides a notebook computer which comprises a display screen and a host with a keyboard, wherein an outer frame and a fixed display screen are arranged on the edge of the display screen; an antenna for wireless communication is arranged in the outer frame; a flexible membrane is attached to the surface of the outer frame, which is dead against the antenna, and comprises a membrane body and a plurality of artificial microstructures arranged on the surface of the membrane body in an array manner, and the surface of the membrane body is contacted with the outer frame; and the artificial microstructures have a planar structure which consists of a wire made of a conductive material and has a geometric pattern. Due to the artificial microstructures arranged on the flexible membrane on the surface of the outer frame, the flexible membrane has functions of decoration and identification and can enable an electromagnetic wave in a certain frequency band to pass through efficiently and filter an electromagnetic wave in another frequency band, so that an effect of selectively transmitting the waves is achieved; and the surfing speed of the notebook computer under a certain frequency band is increased.

The invention discloses a fiber brag grating dynamic high-pressure transducer which comprises a membrane body, a supporting column, a grating containing fiber brag, an installation shell body, an optical fiber protecting bush and a fixing connector. The membrane body is fixed at the front end of the installation shell body and then forms a pressure sensing face of the sensor. The grating is parallelly pasted to the surface of an inner hole of the supporting column in the axial direction. The hole is full of filling glue. The upper end face of the supporting column is in tight contact with the membrane body. A conical type contact face is adopted between the lower end face of the supporting column and the installation shell body. The optical fiber arranged in the fiber protecting bush in a sleeved mode is fixed at the lower end of the installation shell body through the fixing connector. The fiber brag grating dynamic high-pressure transducer is characterized in that pressure deformation of the circular supporting column is utilized to convert outside pressure into strain changes of the fiber brag grating (FBG), and pressure sensing is realized through measurement of strain. The sensor is firm in structure, high-temperature resistant, strong impact vibration resistant, free of electromagnetic interference, especially suitable for being used in severe environments such as explosion environment, and is convenient and quick to manufacture and low in cost.

The invention relates to a lithium battery soft packaging membrane which comprises a nylon layer, an aluminum foil layer and a heat sealing layer; the surface of the aluminum foil layer is provided with an anticorrosion layer; the anticorrosion layer comprises an anticorrosion layer main membrane body and a composite layer compounded on the anticorrosion layer main membrane body; the anticorrosionlayer main membrane body is gel with good anticorrosion performance; the composite layer comprises a non-woven fabric layer and elastic bugles arranged on the non-woven fabric layer; and the elasticbugles are arranged facing the anticorrosion layer main membrane body. In the technical scheme of the invention, by improving the anticorrosion layer, the anticorrosion layer has good tensile resistant ability and impact resistant ability; the anticorrosion layer main membrane body is the gel, and the composite layer is a non-woven fabric; the surface of the non-woven fabric is provided with the multiple elastic bugles, one surface, provided with the elastic bugles, of the non-woven fabric is arranged facing the anticorrosion layer main membrane body, each elastic bugle is abutted to the anticorrosion layer main membrane body, and an elastic square block is formed on the non-woven fabric among the elastic bugles when the external impact force is applied to the non-woven fabric, so that theimpact resistance of the whole structure is improved.

The invention discloses a spiral-wound membrane aeration bioreactor. The reactor comprises: a cylindrical spiral-wound MABR membrane body, wherein the spiral-wound MABR membrane body comprises a central air inlet pipe and a biological membrane group rolled on the air inlet pipe; an air outlet structure is arranged on a pipe body of the air inlet pipe; the biological membrane group comprises an oxygen-permeable hydrophobic membrane bag and an aeration filler from outside to inside, the oxygen-permeable hydrophobic membrane bag is of a bag type structure with three sealed sides and an opening inone side, the opening of the oxygen-permeable hydrophobic membrane bag is communicated with the air outlet structure of the air inlet pipe, and an air conveying separation net is placed in the oxygen-permeable hydrophobic membrane bag; the aeration filler is a flat plate type filler, and an aeration structure is arranged on the flat plate; and an air outlet pipe arranged on the outer side of thespiral-wound MABR membrane body and communicated with the oxygen-permeable hydrophobic membrane bag. The spiral-wound MABR membrane body is composed of the aeration filler and the oxygen-permeable hydrophobic membrane bag and is formed by alternately and spirally rolling the aeration filler and the oxygen-permeable hydrophobic membrane bag, and the MABR membrane assembly with high packing densityis obtained, so that the aeration efficiency is improved, and the energy consumption is reduced.

The invention provides a protective shell of a wireless communication device. A flexible membrane is stuck on the surface of the protective shell, the flexible membrane comprises a membrane body and a plurality of artificial microstructures which are arranged on the contact surface of the membrane body and the protective shell in an array, and each artificial microstructure is a planar structure which is constituted by silk threads made of conductive materials and has a geometrical pattern. By utilizing the artificial microstructures arranged on the flexible membrane on the surface of the protective shell, the flexible membrane has the effects of decoration and marking and can enable electromagnetic waves in a certain frequency band to pass with high efficiency and filter out electromagnetic waves in another frequency band, thereby achieving the effect of selectively transmitting the waves and improving the working efficiency of the wireless communication device in a certain frequency band.

A pressure measuring cell includes at least one ceramic measuring membrane body; and at least one ceramic platform, wherein the measuring membrane body is connected with the platform along an annular, peripheral joint. The joint is formed as a welded connection between the measuring membrane body and the platform, wherein the measuring membrane body has a pressure-dependently deformable measuring membrane. A pressure sensor includes a pressure measuring cell and a housing, wherein the pressure measuring cell is held by the housing, and wherein the pressure measuring cell closes a housing opening, through which the pressure measuring cell communicates with an environment of the housing. A seal is clamped between a sealing surface surrounding the opening of the housing and a sealing surface of the pressure measuring cell.