586 results about "Dumbbell shaped" patented technology

In some embodiments, a medical device may include one or more of the following features: (a) a metal fabric formed of braided metal strands, (b) the medical device having a collapsed configuration for delivery through a channel in a patient's body and having a generally dumbbell-shaped expanded configuration with two expanded diameter portions separated by a reduced diameter portion formed between opposed ends of the device and unsecured metal strand ends at the opposed ends, and (d) a thrombogenic agent located on the metal fabric.

The invention discloses a method of producing the hyperfiltration membrane of amphiphilic copolymer modified polyvinylidene fluoride, comprising the following steps: 1) mixing polyvinylidene fluoride, poly (methyl methacrylate - monomethyl ether polyoxyethylene methyl methacrylate), additives, non-solvent and solvent to form the casting film solution; 2) making the casting film solution into the polyvinylidene fluoride membrane by using the film forming machine and then soaking in the coagulation bath; 3) conducting the posttreatment of hydrophilicity; 4)obtaining the hydrophilic polyvinylidene fluoride ultrafiltration membrane after cleaning and drying. The method is characterized in that the brush shape, chain ball shape or dumbbell shape amphiphilic copolymer are mixed with the polyvinylidene fluoride to produce the polyvinylidene fluoride hyperfiltration membrane with hydrophilicity, anti-pollution, large flux and high retention rate by adopting the solution phase conversion method. The method has the advantages that the obtained membrane is provided with dozens to hundreds nanometer of particular densified hydrogel surface layers, the contact angle of the membrane surface can be reduced below 60 degrees and can be lowered to 0 degree within tens of seconds, the water flux can reach 1000L /m<2>/ h (0.1Mpa) or above, the retention rate of BSA can reach 90% or more and the recovery rate of water cleaning flux can reach 90% or higher.

Dumbbell-shaped or flower-shaped nanoparticles and a process of forming the same, wherein the process comprises forming a mixture of a nanoparticle with a precursor in a first solvent, wherein the nanoparticle comprises a hydrophobic outer coating; heating the mixture; cooling the mixture to room temperature; modifying the hydrophobic outer coating into a hydrophilic outer coating; precipitating a solid product from the mixture, and dispersing the product in a second solvent. The nanoparticles comprise any of a semiconducting, magnetic, and noble metallic material, wherein the nanoparticles comprise a first portion comprising any of PbSe, PbS, CdSe, CdS, ZnS, Au, Ag, Pd, and Pt, and wherein the precursor comprises any of a cationic, neutral or particulate Au, Ag, Pd, Pt, or transition metal (Fe, Co, Ni) precursors of Fe(CO)₅, Co(CO)₈, Ni(CO)₄ or their analogues. The first and second solvents comprise any of alkanes, arenes, ethers, nitrites, ketones, and chlorinated hydrocarbons.

A resistance training exercise device having a dumbbell shaped vibrating device, a shoe type of device having a sole adapted to be removably attached to a person's foot, and a device for attaching the dumbbell shaped vibrating device to the sole of the shoe type of device

The invention relates to a concrete multi-factor durability test device under the common effect of tensile stress and environment, wherein, the lower part of a pull rod (8) is connected with a lower pull plate (13), the upper part of the pull rod (8) penetrates an upper pull plate (7) and a limit plate (4), the upper pull plate (7) is penetrated on the pull rod (8) to be fixed by a lock nut (6), a screw cap (2) presses a stress sensor (3) on the limit plate by a spherical screw rod (1), a spring (5) is sheathed on the spherical screw rod (1) and is positioned between the limit plate and the upper pull plate, an upper stretching chuck (91) and a lower stretching chuck (92) are arranged between the upper pull plate and the lower pull plate (13), the upper stretching chuck (91) is connected with the spherical head part of the spherical screw rod (1), the lower stretching chuck (92) is connected with the spherical head part of a spherical pull rod (12), a dumbbell-shaped concrete sample (10) is positioned between the upper stretching chuck (91) and the lower stretching chuck (92), the dumbbell-shaped concrete sample is held by the stretching chucks, both sides of the dumbbell-shaped concrete sample (10) are provided with constant force holding instruments (11), and the constant force holding instruments are connected with a non-metallic ultrasonic testing instrument (14).

A device for exercising when partially submerged in water. The device includes a dumbbell shaped floatation member for providing buoyant resistance once submerged underwater. This dumbbell shaped member can accept extensions on either end thereof. A second dumbbell member and a second pair of extensions is provided. A third component of the buoyancy system is a buoyancy member that would threadably engage both dumbbell shaped members to provide for a barbell shaped device for submerging underwater and providing buoyant resistance for the user to work against. The pairs of extension may be threadably engaged either end of the barbell member.

The invention provides an MIMO mobile terminal multi-antenna with high separation and low corresponding characteristic. The invention relates to the field of wireless communication and solves the problem that a plurality of antennas are integrated in small spaces. The antenna main body of the invention is a dual-layer medium structure, namely an upper-layer medium and a middle medium; a first patch and a second patch with identical shape and size are attached to the left side and the right side of the upper surface of the dual-layer medium structure intermittently; the lower surface of the dual-layer medium structure is provided with a lower floor; the center of the lower floor is provided with a dumbbell-shaped opening; a first feeding microstrip line and a second feeding microstrip line are the first feeding microstrip line group; other two feeding microstrip lines are the second feeding microstrip line group; two feeding microstrip line groups are arranged between the upper-layer medium and a middle medium and respectively arranged at one side of the first patch and the second patch; the feeding micro-strip lines inside each feeding micro-strip line group are vertical to each other, not crossed to each other and mutually symmetrical on the structure. The MIMO mobile terminal multi-antenna improves the separation characteristic between the antennas, reduces the correlation, has the advantages of compact structure, easy integration, small space occupying, and can be used for the MIMO mobile terminal and low cost.

The present invention relates to a dumbbell-shaped slot coupling excitation-based wideband low-profile microstrip antenna. The dumbbell-shaped slot coupling excitation-based wideband low-profile microstrip antenna comprises a rectangular radiation patch, a metallized isolation via hole array, an inner-layer metal ground board, a dumbbell-shaped coupling slot, a strip line feeder, a quasi-coaxial vertical interconnection structure, a microstrip feeder, an annular opening pad and an SMP connector for feeding. The antenna is constructed by using a laminated PCB technology; a three-dimensional transmission structure is constructed through a microstrip-quasi-coaxial metallized via hole-strip line structure; and the rectangular radiation patch is excited based on the special dumbbell-shaped coupling slot. The antenna has the advantages of compact structure, small horizontal dimension, low profile, low cost, easiness in processing, easiness in integration and the like, and can meet the use requirements of 12 GHz-to-18 GHz Ku bands and is very suitable for being applied to a Ku- band wideband phased array system.

The invention belongs to a light-weight engine cylinder sleeve of a passenger vehicle and a production method of the light-weight engine cylinder sleeve. Black spots are distributed on the outer circular surface of the cylinder sleeve, wherein the shapes of the black spots comprise a dumbbell shape, a positive frustum shape, a worm shape and an olecranon shape; the black spots in the four shapes are randomly distributed on the outer circular surface of the cylinder sleeve; the black spots are 0.25-1.1mm in height. The black points of the cylinder sleeve are only 0.25-1.1mm; the blank cooling speed in the centrifugal casting process of the cylinder sleeve is obviously reduced, thereby obviously improving a metallographic structure, improving the friction resistance of the cylinder sleeve and prolonging the service life of the cylinder sleeve; meanwhile, the black spots are small in height fluctuation, so that the roundness fluctuation in the process of casting an aluminum cylinder body is remarkable reduced; the possibility that engine oil sneaks into a combustion chamber is reduced; the tail gas emission of the combustion chamber is reduced; by the low-height black spots and the excellent metallographic structure, the wall thickness of the cylinder sleeve is reduced by 1mm; the cylinder center distance of the engine cylinder sleeve is reduced by over 2mm.

The invention provides a spine massager used for treating pain in waist and legs resulting from pathological changes of the spine. The spine massager comprises a runner rail parallel to the bed surface, a transmission part, a motor and a sliding support arranged on the runner rail, wherein the output end of the motor is connected with one end of the transmission part; the other end of the transmission part is connected with the sliding support; the sliding support is provided with a vibrator; two ends of the sliding support are provided with massaging columns; one end of the massaging column is connected with the sliding support through a spring; and the other end of the massaging column is connected with a dumbbell shaped massaging wheel. Because of massaging two sides of the spine to stimulate points, the spine massager has the functions of promoting blood circulation by removing blood stasis, relieving channels and collaterals, regulating viscera and building kidney and strengthening bones; if required, the massager is used to be matched with medicines to give a play to treatment effects on the pain in the waist and the legs resulting from strain of lumbar muscles, ligament synechia, spine anaplasia, lumbar intervertebral disc protrusion, and the like.

The invention discloses a substrate integrated waveguide split ring resonator-based microwave band pass filter. The microwave band pass filter comprises a substrate integrated waveguide which is formed by fixing two rows of metal members on a dielectric substrate, wherein the two ends of the substrate integrated waveguide are connected with a micro-strip feed line respectively; the surfaces of both the micro-strip feed line and the substrate integrated waveguide are made of metal dielectric; the upper surface of the substrate integrated waveguide is positioned between the two rows of metal members to corrode an m*n split ring resonator array; and a row of dumbbell-shaped area bodies or dumbbell-shaped deformation areas are corroded corresponding to each line of split ring resonators on the lower surface of the substrate integrated waveguide between the two rows of metal members. The band pass filter has the advantages of out-of-band steep attenuation, small volume, light weight and high power capacity and is easy to be integrated with other planar microwave and millimeter-wave circuits, so that the band pass filter is expected to be applied to the microwave and millimeter-wave integrated circuit or a millimeter wave integrated circuit.

The invention belongs to the technical field of functional macromolecule and experimental mechanics, and provides a gripping device for testing pull-power property of low intensity hydrogel. The device includes a dumbbell shaped mould, a gripping device A applied to a reciprocally moving testing machine and accessories thereof, or includes a dumbbell shaped mould, a gripping device B applied to a reciprocally moving testing machine and accessories thereof; different gripping devices correspond to different accessories. The reciprocally moving testing machine applies static, dynamic load to hydrogel samples, and finishes curve measurement for power and displacement. The present invention has the effects and benefits that the pull provided by the gripping device when pulling to the gripping head of hydrogel samples, replaces in the original method the adhesive force of using glue, whose main component is cyanoacrylate, to stick the hydrogel sample on the gripping device. The present invention enhances the measurement accuracy for the pull-power property of low intensity hydrogel. The device has strong controllability, operates conveniently and fast, and is simple for production and promotion.

The invention discloses a multifunctional shape-protecting health-care medicinal pillow for an infant. The pillow comprises a pillow core sleeve (4) and a pillow core; and the pillow is of a flat dumbbell shape. The pillow is characterized in that the pillow core sleeve (4) is made of a bamboo fiber fabric or a fiber modified sanitary finished antibacterial deodorant fiber fabric; the pillow core consists of a plurality of upper medicine cavity bags (2) connected with each other, a plurality of lower medicine cavity bags (1) connected with each other, isolating cloths (5) and a filling material (3), wherein the plurality of the upper medicine cavity bags connected with each other are isolated from the plurality of the lower medicine cavity bags connected with each other by using two layers of isolating cloths (5); and the filling material (3) is filled between the two layers of the isolating cloths (5). The multifunctional shape-protecting health-care medicinal pillow for the infant has the effects of promoting normal head development, protecting the shape of a head, correcting developmental malformation such as flat head, torticollis, square head, acrocephalia and the like on the infant, has a plurality of functions of developing intelligence, promoting development, preventing diseases, strengthening body and protecting health and the like, and has the characteristics of safety and effectiveness without toxic or side effect.

The invention discloses a substrate integrated ridge gap waveguide and a broadband circularly polarized leaky wave antenna. The substrate integrated ridge gap waveguide comprises an upper layer dielectric plate, upper layer peripheral metallized vias, an upper layer rectangular metal patch, two rectangular annular metal patches, a lower layer dielectric plate, lower layer peripheral metallized vias, a metal ridge, an electromagnetic band gap EBG structure, a metal ground, a feeding probe and a matching probe; the substrate integrate metal ridge is formed by two rows of metallized vias in the center of the low layer and a dumbbell-shaped metal patch; the electromagnetic band gap EBG structure is composed of periodic mushroom-shaped structural units arranged on both sides of a rectangular strip in the middle of the dumbbell-shaped metal patch, and is used for limiting electromagnetic wave leakage to two sides. The upper layer and lower layer dielectric plates are tightly bonded. The wideband circularly polarized leaky wave antenna is a slot array arranged on the upper surface of the upper rectangular metal patch, and circularly polarized radiation is realized. The invention maintainsthe wide band and frequency scanning characteristics of the leaky wave antenna, and realizes the characteristics of circular polarization and high gain flatness.

The present invention provides a method for the rapid simultaneous production of a plurality of single-stranded DNA circles having a predetermined size and nucleotide sequence using pre-designed hairpin oligonucleotides containing complementary sequences for directing ligation to form dumbbell-shaped monomers followed by heat denaturation to yield single-stranded DNA circles.

The present invention provides a simple method for producing a dumbbell-shaped DNA.

A method for producing a dumbbell-shaped DNA, wherein each of sense and antisense strands is connected at both the 5′ and 3′ ends of a linear-shaped double stranded DNA by a single stranded DNA of loop structure, comprising the steps of;

• 1) amplifying a target DNA in a template DNA by PCR using sense and antisense primers, wherein each of the sense and antisense primers contains the following sequence (a) at the 5′ end and also contains the following sequences (b), (c), and (d) in order from the 5′ end to the 3′ end,
  • (a) a part of a sense sequence of a nickase recognition sequence, comprising the sequence of a region between the site where a nick is introduced by the action of a nickase and the 3′ end,
  • (b) a sequence capable of forming a loop structure from a single strand,
  • (c) the entire antisense sequence of the nickase recognition sequence (a),
  • (d) a sequence complementary to all or part of the sequence of the target DNA;
• 2) treating the amplified DNA product of step 1) with a nickase of (a);
• 3) heating and then annealing the nickase treated amplified DNA product of step 2); and
• 4) treating the heated and annealed amplified DNA product of step 3) with DNA ligase, wherein the sense and antisense primers used in step 1) are phosphorylated at the 5′ end, or the amplified DNA product is phosphorylated at the 5′ end after step 1) but before step 4).

The invention relates to a test mold, and particularly relates to a dumbbell-shaped mold used for concrete uniaxial tension test, and a rod piece pre-embedding method. The mold for the concrete axial tension test piece comprises a bottom plate. Two opposite sides of the bottom plate are fixedly connected with side plates; the other two opposite sides of the bottom plate are provided with end part plates; the bottom plate, the side plates and the end part plates are combined to form a hollow box with the top opening; the opposite sides of the two side plates are convex at the middle parts to form lug bosses; two sides of each side plate are provided with insert holes protruding out of the planes of the end part plates; a horizontal rod is connected between the directly opposite insert holes of the two side plates; a through hole I is formed in the middle of the horizontal rod; a vertical rod penetrates through the through hole and then is inserted in a fixed hole arranged in the bottom plate; the end part plates are limited by the horizontal rod and the vertical rod; a through hole II is formed in each end part plate respectively; and pre-embedding pieces are inserted into the through holes II. The manufacturing precision of the test piece is high and a flow for manufacturing the test piece is simple.

The invention discloses a tri-metal nanoparticle and a preparation method thereof. The tri-metal nanoparticle is dumbbell-shaped in morphology, a gold bipyramid is arranged at the waist, and heads at two ends of the waist are in sliver-palladium alloy branch shapes. The gold bipyramid is taken as a seed, a silver nitrate solution is taken as a metal precursor, a clubbed template nanoparticle adopting a core-shell structure and with the gold bipyramid covered with sliver is prepared with a seed growing method, and the template nanoparticle is scattered in ultrapure water after centrifugation; by using modified electric displacement in combination with a co-reduction reaction, a palladium chloride acid solution is added into an aqueous solution of the obtained template nanoparticle, ascorbic acid is taken as a reducing agent, and standing is performed at a room temperature; and the dumbbell-shaped tri-metal nanoparticle is obtained through adjusting the molar ratio of silver nitrate to palladium chloride acid and standing time. According to the tri-metal nanoparticle and the preparation method thereof, the nanoparticle in the sliver-palladium alloy branch shape is selectively grown on the gold bipyramid, and a tri-metal nanostructured material is diversified in physicochemical property and high in adjustability.

The invention discloses shape and size controllable gold nanoparticles and a preparation method and application thereof. The water-soluble and monodispersed gold nanoparticles with different shapes and sizes are synthesized by adopting a seed growth method, and the shapes comprise the spherical shape, the bar shape, the dumbbell shape, the bipyramid shape, the cube shape and the star shape with abranch structure. The series of nanogold with different sizes can be obtained in the mode of changing a seed solution by taking ascorbic acid or sodium borohydride or hydroquinone as a reducing agent,taking hexadecyl trimethyl ammonium bromide as a cationic surface active agent and a stabilizing agent and taking sodium citrate as a reducing agent and a stabilizing agent, fine control over the shape and the size of the nanogold is achieved, the high yield, the high purity and the good water solubility are achieved, no biotoxicity is generated, and a purification technology is simple. The shapeand size controllable gold nanoparticles can be applied to the fields of photoacoustic imaging, photothermal therapy and biosensing.

The invention discloses a mould forging process used on a U-shaped hanging folder as a component of a hanging boiler in the manufacturing process of a power station boiler. A forging die and a trimming die are manufactured, the cavity outline of the forging die is fundamentally identical to the outline of the U-shaped hanging folder, and the forging die has a forging margin and a draft; firstly, material are forged into blank which is then arranged in the mould cavity for forging molding, at last the raw edges are removed by the trimming die; the sub-forging die of the mould forging is positioned at the central line of the U-shaped hanging folder, with an outer draft of 7 DEG and an inner draft of 5 DEG; the bridge part of the forging die is provided with a choke trough; the blank presents a dumbbell shape. The mould forging process provided by the invention has the advantages that the die, the blank structure and the technics steps are reasonable and practical; the U-shaped hanging folder forge piece is forged and molded at one go, the lifting lug dispenses with bending, the quality of products is acceptable, the production efficiency is high, the minimum output per shift is more than 200, and the economic benefit is good.

The present invention relates to an impact absorbing dumbbell and an impact absorbing barbell disk. The impact absorbing dumbbell includes an outer cover prepared by cutting a flexible member into a dumbbell and sewing the cut flexible member, thereby having a dumbbell shape, a cylindrical tubular body installed inside the middle portion of the outer cover for serving as a handle and keeping the dumbbell shape, and weight constituent powder charged in the outer cover. The impact absorbing barbell disk includes an outer cover prepared by cutting a flexible member into a barbell disk and sewing the cut flexible member, thereby having a barbell disk shape, weight constituent powder charged in the outer cover, and a bushing made of metal or synthetic resin, the bushing being inserted and fixed in the central shaft hole of the outer cover.