34results about How to "Improve internal stability" patented technology

A biodegradable medical device including at least one biodegradable material and having an initial shape and at least one evolved shape. The evolved shape is different from the initial shape. The initial shape is adapted to change towards the evolved shape due to an external stimulus. The medical device has a tension loaded to a predetermined tension level. The medical device is adapted to restore the tension to the predetermined tension level for at least 2 weeks in physiological conditions, or conditions simulating the physiological conditions.

The invention provides a crosslinking imidazole type polyether-ether-ketone anion-exchange membrane for a fuel cell, and a preparation method thereof, which belong to the fields of high polymer chemistry and anion-exchange membrane fuel cells. A structural formula of the anion-exchange membrane is as shown in a formula I. The invention also provides the preparation method of the crosslinking imidazole type polyether-ether-ketone anion-exchange membrane for the fuel cell. The method comprises the steps of firstly preparing polyether-ether-ketone; then carrying out bromination substitution reaction on methyl on the polyether-ether-ketone, and obtaining brominated polyether-ether-ketone; adding 1-methylimidazole and 1-vinyl imidazole into a brominated polyether-ether-ketone solution, and obtaining a mixed solution; finally pouring the mixed solution onto a glass plate, drying, and obtaining a paved membrane which is the crosslinking imidazole type polyether-ether-ketone anion-exchange membrane for the fuel cell. The anion-exchange membrane provided by the invention has high ionic conductance, high alkali resistance, higher mechanical performance and higher relative selectivity; the preparation method provided by the invention is simple and low in cost.

A vacuum mixing system for the mixing of polymethylmethacrylate bone cement comprising at least one cartridge (4) having an evacuatable internal space (5) for the mixing of the bone cement, the internal space (5) of which comprises a cylindrical swept volume, a mixing element (12) that is arranged in the internal space (5) of the cartridge (4) such as to be mobile and can be operated from outside the vacuum mixing system in order to mix the content in the internal space (5) of the cartridge (4), and a dispensing plunger (2) having a cylindrical external circumference whose first base surface borders a base surface of the internal space (5) of the cartridge (4) and which can be or is locked to the cartridge (4) in detachable manner and which, in the detached state, is mobile in the cylindrical region of the internal space (5) of the cartridge (4).

Employing the known “tensegrity” principle, a female condom is configured such that when the condom is inserted into a woman's vagina, the woman's introitus acts on a proximal section of an elongated pouch extending between internal and external biasing members (e.g., rings) of the condom. Inward compressive forces exerted by the introitus on the inner ring of the condom cause the inner ring to be pushed distally within the vaginal canal, and the proximal pouch section to become a tension member pulling against the external ring. This causes a “tenting” of the proximal pouch section against the introitus. The resulting interaction of compression and tensile forces (a tensegrity effect) serves to provide the condom with a high degree of internal and external stability, including resistance to twisting and slippage.

The present invention refers to a reaction rod arrangement, in particular a V-stay suspension, for a vehicle including a bushing (1), wherein the bushing (1) comprises a rigid core member (3) having a bearing portion (9) and defining a longitudinal axis (z), and an elastomer body (11) being arranged on at least a portion of the radially outer surface of the bearing portion (9), characterised in that the bearing portion (9) comprises a first and a second tapering portion (37, 39), wherein the first tapering portion (37) tapers towards one axial end of the bearing portion (9) and the second tapering portion (39) tapers towards the other opposite axial end of the bearing portion (9), wherein the axial extension of the bearing portion (9) is larger than its maximal radial extension with respect to the longitudinal axis (z), and wherein the elastomer body (11) is movably arranged on the bearing portion (9) such that the elastomer body (11) is able to perform a rotational movement about thelongitudinal axis (z) relative to the rigid core member (3) and a tilting movement about an axis perpendicular to the longitudinal axis (z) relative to the rigid core member (3).

In a ceramic capacitor according to the present invention, an interdiginated pair of internal electrodes are arranged, on a substrate, perpendicular to a surface of the substrate, and a ceramic dielectric member is filled into a gap between this pair of internal electrodes. For this reason, the dimensions of the internal electrodes do not substantially change before and/or after the formation of the ceramic dielectric member, whereby the dimensions formed at the time of internal electrode can be maintained. According to this ceramic capacitor, since the internal electrode dimensions can be easily controlled like this, dimensional control of internal electrode spacing can also be easily carried out.

The invention relates to a high-crack resistance resistant fire-proof stopper, and belongs to the field of refractory materials. According to the high-crack resistance resistant fire-proof stopper, serpentine and dolomite are treated, the number of harmful pores is reduced, a fine structure of a fire-proof crack-resistant base material is refined, the compactness is improved, stress concentrationis reduced, expansion stress is relieved, cracks due to a hard heat effecthigh temperature are avoided, a rheological agent and sodium metasilicate are introduced for wrapping and assisting in fillingof stopper pores, and the compaction and a thermal crack resistance effect of the base material are improved; octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and the like are used as rawmaterials, so that the internal stability of the high-crack resistance resistant fire-proof stopper is improved, and different levels of expansions which is generated after heating is conducted is reduced; coal ash is subjected to pre-treatment, so that the bonding strength in a system is further improved, the treated coal ash further plays a part inand further filling and toughening effects are realized, the problem that under heating action, the stopper cracks due to heating can be effectively solved, and the internal mechanical performance is improved. By means of the high-crack resistanceresistant fire-proof stopper, the problems that currently, commonly used fire-proof stoppers are prone to crack in the presence of heat, and the internal mechanical performance is poor are solved.

The invention relates to the technical field of protective slopes, in particular to a landscape design greening protective slope. The landscape design greening protective slope comprises a slope body,the slope body comprises a first soil layer, a pavement stone plate layer is laid at the top of the firs soil layer, a plurality of first concrete grouting columns are arranged in the first soil layer, a water seepage layer is arranged at the bottom of the first soil layer, a second soil layer is arranged at the bottom of the water seepage layer, a plurality of second concrete grouting columns are arranged in the second soil layer, a vegetation layer is arranged on the slope surface of the slope body, steps are arranged on the slope surface of the slope body, a plurality of partition cement blocks are arranged on the on the slope surface of the slope body, water guiding grooves are formed in the bottom ends of the partition cement blocks correspondingly, a plurality of spraying devices are mounted at the top ends of the slope surface of the slope body, buried water pipes corresponding to the spraying devices are fixedly mounted in the slope body and communicate with the spraying devices, and the ends, away from the spraying devices, of the buried water pipes are connected with water pumps. According to the landscape design greening protective slope, the stability of the protectiveslope is effectively improved, water and soil loss is avoided, and meanwhile, the attractiveness of a landscape is improved.

The invention provides a slot insulation method of a flat wire motor stator. The slot insulation method of the flat wire motor stator comprises the flat wire motor stator, and a stator wire slot is formed in the flat wire motor stator. The slot insulation method of the flat wire motor stator is characterized in that insulating tubes are arranged in the stator wire slot, and are integrally formed insulating tubes; and the insulating tubes are symmetrically inserted in the stator wire slot. Slot insulation is realized by a mode of inserting the insulating tubes in the stator wire slot of the flat wire motor stator, the production efficiency is high, the quality of the product is stable, and the insulating property is good.

A self-variable force hydraulic damper including a housing assembly, a piston rod and a piston assembly. The piston assembly is mounted on the piston rod and includes a first washer, a first disc spring, a first valve plate, a variable displacement piston, a second valve plate, a second disc spring and a second washer; the piston has a first end face and a second end face, and is further provided with a first flow hole and a second flow hole penetrating the first end face and the second end face respectively; the first valve plate is pressed against the first end face, and the first valve plate closes the first flow hole and does not close the second flow hole; the second valve plate is pressed against the second end face, and the second valve plate closes the second flow hole and does not close the first flow hole.

The invention discloses a waterborne polyurethane coating with high surface hardness, and relates to the technical field of waterborne coatings. The waterborne polyurethane coating with the high surface hardness contains sub-micro medical stone powder loaded with active ingredients, and the mass of the sub-micro medicine stone powder accounts for 15-18% of the waterborne polyurethane coating. By addition of the sub-micro medicine stone powder loaded with the active ingredients and through the penetration of the active ingredients loaded in the sub-micro medical stone powder in the coating, a certain crosslinking effect on polymer can be achieved, and the shortcoming that the strength of a traditional waterborne polyurethane coated film is not high is overcome.

The invention discloses a high-stability wallpaper adhesive, and belongs to the field of chemical building materials. Diatomite, hexacyclic stone and the like are used for preparing a homogenizing material, a large amount of diatomite components exert a cation exchange property and are in exchange interaction with cations in an organic compound, the internal stability is improved, microcrystallinecellulose is used as a main component, 1-allyl-3-methylimidazolium chloride is used as an ionic solvent and p-dioxanone is used as a grafting monomer to prepare an amphiphilic fiber polymer material,and a hydrophilic shell is used for stabilizing and dispersing micelles and protecting contact between hydrophobic molecules and an environment medium, and has a good moisture resistance; a moisture-proof material is prepared by taking acrylamide, methyl methacrylate and the like as raw materials, so that a macromolecular polymer in an aqueous solution exceeds a certain mass concentration, hydrophobic portions are associated to form a dynamic three-dimensional network structure, a moisture-proof effect is stabilized, and the bonding strength of the wall adhesive is improved. The problem thatthe commonly used wallpaper adhesive at present is easy to damp and low in adhesion stability is solved.

The invention relates to the field of LED display screens, in particular to a flexible LED display screen which comprises a supporting mechanism, a main body, a fixing shell, a fixing mechanism, a limiting mechanism and a connecting mechanism. When the main body is installed, the center of the main body is fixed by the fixing mechanism, the limiting mechanisms drive the edge of the main body to get close to the fixing mechanism, the bent main body is fixed to the side wall of the fixing mechanism, and when the main body is pulled to be bent, the fixing mechanism clamps the limiting mechanismsto prevent the limiting mechanisms from moving reversely, so that damage caused by sudden bounce of the main body is avoided. The two ends of the fixed main body are fixed by the fixing shell and thesupporting mechanism correspondingly, the stability of the bent main body is improved again, after one main body goes wrong, the fixing shell at the top end of the main body is taken down, and the fixing mechanism corresponding to the main body is pulled upwards, so that the fixing mechanism drives the main body to slide out from the interior of the supporting mechanism, so that the fixing mechanism drives the main body with problems to slide out from the interior of the supporting mechanism, and maintenance is facilitated for people.

The invention discloses a novel PP laboratory fume hood. The fume hood comprises a PP made fume hood body, and the PP made fume hood body comprises an upper fume hood body and a lower fume hood body;an air draft opening with a built-in fan is formed in the top of the upper fume hood body, the outer side of the top of the upper fume hood body is reinforced by a guardrail plate, and an operation table board is arranged in the upper fume hood body; a movable operation door is arranged on the front side of the operation table board, a plurality of maintenance doors are arranged on the back side of the operation table board, a first illumination lamp with a protection cover is arranged above the operation table board, an observation window is arranged on one side of the operation table board,and an air flow grid is arranged on one side of the observation window; and a control face board is arranged beside the movable operation door, and an air valve, a socket and a second illuminating lamp are arranged below the movable operation door; and a temperature sensor is arranged on the inner sides of the maintenance doors, and a thermometer and a touch switch are arranged on the control faceboard. The novel PP laboratory fume hood has the advantages that the volume is compact, the structure of the fume hood body is reinforced by PP made material, the internal stability is improved, thestructure is flexible, the combination performance are high, and the novel PP laboratory fume hood has competitive advantage in market.