930results about How to "Reduce secondary damage" patented technology

The invention discloses concrete healant, which comprises following components by weight percent: 30 to 55 percent of gelatinization materials, 40 to 65 percent of fine aggregates, 0.1 to 0.5 percent of water reducing component, 0.05 to 0.5 percent of early-strengthening component, 0.05 to 0.2 percent of delayed-coagulation component, 0.2 to 1.0 percent of nano materials, 0.5 to 1.0 percent of high-activity substances, 0.01 to 0.2 percent of water retention thickening component, 0.2 to 2.0 percent of polymer and 0.02 to 0.2 percent of defoaming agent. The concrete healant not only has characteristics of good mobility, fast strength development, high adhesion strength and small retraction, but also can fill active substances into original concrete gaps and can produce compact crystals, so that the cohesion strength of the new and the old concrete interfaces can be remarkably improved, and the concrete healant is applicable to the concrete mending projects of bridges, caves, industrial workshops and civil construction.

The invention discloses a barium-strontium-calcium descaling and blockage removing agent for a near-well area and a preparing method of the barium-strontium-calcium descaling and blockage removing agent. The barium-strontium-calcium descaling and blockage removing agent comprises a polyamine carboxylate solution, nonionic surfactant accounting for 3%-10% of the total mass of the polyamine carboxylate solution and an emulsion breaker accounting for 2%-8% of the total mass of the polyamine carboxylate solution. The polyamine carboxylate solution is prepared from polyamine midbody and chloroacetic acid salt through a reaction, wherein the polyamine midbody is prepared through organic amine and epoxy chloropropane with the mole ratio of 1.05-1.5:1 through a reaction, and the chloroacetic acid salt is prepared from chloroacetic acid and alkali with the same mole ratio through a reaction. The barium-strontium-calcium descaling and blockage removing agent for the near-well area has a good removing effect on indissolvable salt such as barium sulfate, strontium sulfate and calcium sulfate, and the descaling rate is higher than 40%. Meanwhile, the barium-strontium-calcium descaling and blockage removing agent has the expansion preventing and inhibiting performance, the clay expansion reducing rate is higher than 80%, corrosion to equipment is slight, and water locking can be avoided. Blockage removing can be effectively achieved on a reservoir stratum near a well, the permeability of the reservoir stratum is improved, and thus the recovery ratio of oil and gas resources is increased.

The invention discloses clean carbon dioxide foam fracturing fluid and a preparation method thereof, and relates to the technical field of oilfield chemistry and fracturing production increase. The carbon dioxide foam fracturing fluid is mainly composed of a base solution, a foaming agent, a gel breaker and liquid carbon dioxide with the mass ratio being 100 to 0.15-0.45 to 0.02-0.08 to 100-900. The base solution is formed by 0.2%-0.55% of a thickening agent and water. The thickening agent is mainly formed by bisacrylamide, vinyl pyrrolidone, kation unsaturated monomer, anion unsaturated monomer, an initiator, sodium carbonate, an emulsifying agent and a hydrotropy agent. The foaming agent is mainly formed by hexadecyl dimethyl tertiary amine, dimethyl sulfate, caustic soda flakes, potassium persulfate and solvent. The clean carbon dioxide foam fracturing fluid has the advantages of being high in foam stability, high in temperature resistance and shear resistance, high in sand-carrying performance, wide in applicable temperature range, extremely low in residue content, high in backflow performance, and small in secondary damage to a reservoir after fracturing, thereby improving the fracturing effect and increasing the reservoir productivity.

A system is provided for remotely detecting and locating damaged conductors. The system includes at least one slave controller disposed proximate at least one load and electrically connected to the loads via at least one conductor. The slave controller includes at least one solid-state switch capable of controllably altering the input current to the loads, as well as at least one measuring element for measuring at least one parameter associated with the loads and the solid-state switches. The solid-state switch can controllably alter the input current to the loads according to the parameters. The system also includes at least one damaged wire detector electrically connected to the conductors between the slave controller and the loads. The damaged wire detector is capable of detecting and/or locating at least one damaged conductor.

The invention discloses an air cushion type operation patient transfer trolley and belongs to the technical field of medical instruments. The air cushion type operation patient transfer trolley comprises a transfer bed and a transfer trolley body, the air cushion type transfer bed is placed on a transfer trolley plate of the transfer trolley body and locked by a locking frame, the transfer trolley body comprises a main transfer trolley body, a transfer trolley base and a lifting frame, the main transfer trolley body is supported on the transfer trolley base through the lifting frame, the transfer bed is an air cushion type transfer bed which is mainly composed of an air cushion bed framework, an air cushion bracket and an air cushion, and the air cushion is formed by a front portion and a rear portion which are connected through a zipper. According to the air cushion type operation patient transfer trolley, a patient is transferred by means of an air cushion technology, the patient is not required to be moved again in the transferring process, labor intensity of medical workers is reduced, body positions of the patient are not required to be moved when the patient is transferred from the transfer trolley to an operating bed, pains of and secondary injuries to the patient during transferring are reduced, merely one medical worker is required to transfer the patient from a hospital bed to the operating bed, the operation is simple and convenient, and the transfer trolley is suitable for a hospital to transfer a seriously injured patient from an ambulance to an operating room.

The invention relates to a catalytic coolant used in a hot aerosol fire extinguishing device and a processing technique of the catalytic coolant. As to the coolant, heat absorption cooling components mainly include manganese carbonate or manganese oxalate, manganese phosphate, potassium manganate, metal carbonate of a family I, a family II and a transition family, basic carbonate, oxalate and the like; a metal oxide or a hydroxide are adopted as a catalyst, an oxidant and a reinforcing filling; stearate, graphite and the like are adopted as a processing aid; composite solution of alkalis silicate and a water soluble polymer is adopted as an adhesive; and film materials such as hydroxymethyl or hydroxyethyl cellulose are adopted as a surface coating agent. The processing technique includes the steps of mould pressing, squeezing, pelletizing, coating and forming. Compared with the prior art, the catalytic coolant not only has high intensity and good cooling effect, but also can reduce secondary damage of an extinguishing agent and eliminate the content of poisonous gases in an extinguishing agent product so as to improve the environmental safety of the extinguishing agent.

The invention discloses a cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid and a preparation method thereof. The preparation method comprises the following steps of (1) preparing a thickener for the fracturing fluid; (2) preparing a cross-linking agent for the fracturing fluid; (3) preparing a gel breaker for the fracturing fluid and (4) preparing the cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid. The fracturing fluid prepared by adopting the preparation method has the characteristics of excellent viscoelasticity, temperature resistance and shear resistance, sand-carrying performance and wide applicable temperature range; the fracturing fluid can well meet the requirement on the fracturing construction, and the content of the residue is very low; after the fracturing, the secondary harm to a reservoir is small and thus the fracturing effect is improved and the production capacity of the reservoir is increased.

The invention discloses an automatic bed-transfer stretcher and belongs to the technical field of medical instruments and apparatuses. The automatic bed-transfer stretcher is composed of a base cart, a stretcher bed and a safety bracket. Lifting columns of the base cart and a hydraulic cylinder are supported above a base of the base cart through a cantilever structure and realize ascending and descending of the stretcher. The lower portion of the safety bracket is fixedly connected to the base, the upper portion of the safety bracket is horizontally disposed above the stretcher, and a safety guardrail on the safety bracket and a bed sheet pressing device protect safety of transferred patients. Postoperative patients can be transferred to hospital beds by the aid of the automatic bed-transfer stretcher, body postures of patients are not to be changed during transfer, pain and secondary damage of the patients during transfer are reduced, and a patient can be transferred to a hospital bed from an operating table by only one person. Besides, the automatic bed-transfer stretcher is simple and convenient to operate. By arranging the safety guardrail and a rotating support plate, safety of the patients during transfer is improved, and the automatic bed-transfer stretcher is applicable to transferring postoperative patients to the hospital beds from the operating table.

Output optical energy pulses including relatively high energy magnitudes and steep slope at the beginning of each pulse are disclosed. As a result of the relatively high energy magnitudes which lead each pulse, the leading edge of each pulse includes a relatively steep slope. This slope is preferably greater than or equal to 5. Additionally, the full-width half-max value of the output optical energy distributions are between 0.025 and 250 microseconds and, more preferably, are about 50-70 microseconds. A flashlamp is used to drive the laser system, and a current is used to drive the flashlamp. A flashlamp current generating circuit includes a solid core inductor which has an inductance of about 50 microhenries and a capacitor which has a capacitance of about 50 microfarads. The output optical energy pulses cut target surfaces by interacting with fluid that is located above, on and/or in the target surface. Methods are disclosed for therapeutically treating tissue with pulses of electromagnetic energy.

The invention provides an active protection system and a method thereof for preventing secondary damage of pedestrians, belongs to the technical field of automobiles and solves the problem that pedestrians are not efficiently protected when vehicles and pedestrians collide in the prior art. The active protection system comprises a vehicular control unit, a collision sensor, an automobile forward sensor, a pedestrian protection air bag device and a capture device. The method includes steps of A, detecting collision acceleration of the collision sensor, and detecting property and prior-collision motion states of an object to be collided by the automobile forward sensor; B, controlling the pedestrian protection air bag device to inflate and unfold an air bag when collision intensity exceeds the threshold; C, predicting flight path of the object according to the collision strength and the collision position, so as to correspondingly simulate moving track parameters of a current capture net and controlling the capture device to capture and wrap the object according to the moving track parameters of the current capture net. By the active protection system and the method thereof, secondary damage to the pedestrians can be effectively prevented, and safety of the pedestrians is protected to the greatest extent.

The invention discloses a knee-joint operation adjusting and fixing distraction device which comprises a foot posture adjusting fixing apparatus capable of performing stepless continuous position adjustment and fixing in the front-back direction of a guide rail and rotating at 3360 degrees, a foot-thigh separation distance quick and fine adjusting device capable of achieving quick adjustment and fine adjustment of a separation distance between the foot and the thigh in the vertical direction of the shank, and a thigh posture fixing apparatus capable of adjusting rotation of the fixing apparatus according to a foot posture, wherein the lower end of the foot-thigh separation distance quick and fine adjusting device is connected with the foot posture adjusting fixing apparatus, and the upper end of the foot-thigh separation distance quick and fine adjusting device is connected with the thigh posture fixing apparatus. The foot-thigh separation distance quick and fine adjusting device comprises a quick adjusting rod mechanism with the lower end fixed on a foot fixing boot, wherein the upper portion of the quick adjusting rod mechanism is connected with a fine adjusting mechanism, and the upper end of the fine adjusting mechanism is connected with the thigh posture fixing apparatus. The knee-joint operation adjusting and fixing distraction device can meet continuous or temporary fixing and position adjustment under the condition that the knee joint of a patient is at different bending and stretching angles and inward and outward turning angles and any-time quick, fine and accurate adjustment of the foot, shank, knee joint and thigh positions of the patient and angle postures.

The invention relates to a bionic nerve graft used for peripheral nervous recovery and a preparation method and application thereof. The bionic nerve graft comprises a chitosan film conduit and a fibrous protein hydrogel beam positioned in the chitosan film conduit, wherein the fibrous protein hydrogel beam is prepared from fibrous protein through an electrospinning technique. The bionic nerve graft prepared by the preparation method is formed by the filling of the chitosan film conduit and the fibrous protein hydrogel beam of a multi-stage orientation structure, wherein a nerve regrowth space is effectively supported by a chitosan film, the orientational regeneration of a nerve axon is effectively guided by the fibrous protein hydrogel beam of multi-stage orientation, the cell affinity and the mechanical property of whole materials are good, and in addition, degrading speed and the repairing speed of peripheral nervous tissues are matched.

The invention discloses a high-temperature-resistance low-friction weighted clean fracturing fluid which is suitable for high-temperature and high-pressure reservoir reconstruction at 170 DEG C and a preparation method thereof.The fracturing fluid is prepared from, by weight, 0.2%-0.8% of high-temperature-resistance thickening agent, 0.1%-0.8% of system synergist, 0.1%-0.3% of high temperature stabilizer, 0%-42% of weighting agent and the balance fresh water.The high-temperature-resistance low-friction weighted clean fracturing fluid has the following functions and advantages that the weighting agent can be adopted for weighting, and the density is adjustable between 0 and 1.32 g/cm<3>; good temperature-resistance and anti-shearing properties are achieved, and the requirement of high-temperature deep well fracturing construction at 170 DEG C can be met by adjusting a formula; a good resistance reduction property is achieved, pipeline friction resistance can be effectively reduced, and the resistance reduction rate can reach 70%; the fracturing fluid is a fluid with a reversible structure, and the structure damage after high shearing is small; the residue content of the fracturing fluid is decreased to below 10 mg/L, damage to a reservoir and supporting cracks is reduced, the fracturing effect is improved, and the reservoir productivity is increased.

The invention provides a glucan-based transparent hydrogel dressing and a preparation method thereof. The preparation method of the glucan-based transparent hydrogel dressing comprises the following steps: conducting a reaction between a glucan quaternary ammonium salt derivative and succinic anhydride; then promoting an obtained product to react with small molecules of amination, so that a macromonomer which contains illuminated cross-linking double bonds is obtained; mixing the macromonomer which contains illuminated cross-linking double bonds with an antibacterial agent and an initiating agent; conducting photo initiation so as to prepare a glucan-based transparent hydrogel; and combining the glucan-based transparent hydrogel with a polyurethane film by virtue of a bonding agent, so that the glucan-based transparent hydrogel dressing is prepared. The finished product (the glucan-based transparent hydrogel dressing) prepared by the invention not only can absorb a great amount of wound exudates so as to keep a wound surface wet, but also can avoid wound adhesion, so that the probability of wound infection is reduced and wound surface healing is promoted.

The invention discloses a sliding positioning guide device which comprises an arc-shaped fixing arm including an arc-shaped chute, an arc-shaped sliding arm matched with the arc-shaped chute, a positioning puncture needle matched with a positioning needle and a skeleton fixing part installed in a drill bit sleeve. The starting end of the arc-shaped fixing arm is provided with the drill bit sleeve radially extending along the arc-shaped fixing arm, and the drill bit sleeve is provided with a fixing screw for fixing the drill bit sleeve. The tail end of the fixing arm is provided with a fixing screw for fixing the sliding arm in the arc-shaped chute, the tail end of the sliding arm is provided with the positioning needle radially extending along the arc-shaped sliding arm, and the positioning needle is provided with a fixing screw for fixing the positioning needle. The arc-shaped fixing arm and the arc-shaped sliding arm are con-cyclic, the skeleton fixing part and the positioning needle are located on the same horizontal plane, and the skeleton fixing part installing the drill bit sleeve and the positioning needle encounter at the center of the circle. The sliding positioning guide device is simple in structure, convenient to operate and capable of accurately and rapidly enabling a drill bit or a guide needle to penetrate an appropriate position, reduces secondary operation injury on local soft tissues, shortens the operation time, reduces bleeding, reduces complications of postoperative patients and shortens the hospital stays.

The invention provides an additive for balancing the gastrointestinal health of animals, which is prepared by absorbing 3 to 15 percent of tributyrin, 21.5 to 52.5 percent of lactic acid and 3.5 to 7.5 percent of formic acid with special carrier white black carbon by grade and layer respectively and then combining the mixture with 1 to 10 percent of glutamine. The additive has the effects of controlling diarrhea and accelerating restoration of injured intestinal tract, and starting from a philosophy of balancing the relationship between the gastropore and the intestinal tract, saving resources, reducing environment loads and improving quality of livestock products, a comprehensive gastrointestinal health management scheme is provided.

A historic building clay sculpture protecting and repairing method comprises the steps of recording original shapes of clay sculptures at first, building a ceiling, using filtered tap water or distilled water, toothpaste and toothbrushes to clean away dirt on the surfaces of the clay sculptures, removing air-slake crisp alkali layers of the clay sculptures, carrying out salt elimination on the clay sculptures, grouting tung oil mortar into slits, cavities and holes of the gray sculptures to repair the clay sculptures, using paper strip mixed lime mortar to repair the damaged and incomplete portions of the clay sculptures or rebuilding the clay sculptures according to the recorded original shapes of pictures of the clay sculptures, using natural pigments and lime paste to manufacture color lime paste according to the recorded color of the original shapes of the clay sculptures, plastering the surfaces of the clay sculptures with the color lime paste, painting the clay sculptures with corresponding natural pigments according to the recorded color of the original shapes of the clay sculptures, painting the whole surfaces of the clay sculptures with tung oil for once to three times to seal and protect the clay sculptures, and establishing scientific clay sculpture repairing files after repairing. The historic building clay sculptures repaired with the method can achieve the obvious effect of being preserved for a long time.

The invention discloses a dual-microphone directional noise inhibition system and method fused with fundamental frequency information. The system comprises a main sound signal input device, an auxiliary sound signal input device, a single-channel voice signal separating module and a dual-channel voice signal separating module. The method comprises the steps that the main sound signal input device collects main voices and inputs the main voices into the single-channel voice signal separating module, and the auxiliary sound signal input device collects background noise signals; and output signals of the single-channel voice signal separating module and the auxiliary sound signal input device are all input into the dual-channel voice signal separating module, and finally processed sound signals are output. According to the invention, a contradiction problem between noise remaining and voice distortion is fully considered, noises can be effectively inhibited on the premise that voices are not distorted, and most non-stationary noises in the real environment can be processed.

The invention relates to the technical field of medical dressing, in particular to medical and antibacterial cationic biogel dressing and a preparation method thereof. The medical and antibacterial cationic biogel dressing comprises raw materials in percentage by weight as follows: glycerin, chitosan quaternary ammonium salt, amino-acid iodine, organosilicon quaternary ammonium salt, an indigowoad leaf extraction solution, a prunella vulgaris extraction solution, a paniculate swallowwort root extraction solution and the balance of purified water. The antibacterial dressing has a remarkable antibacterial effect, is transparent, high in water content, non-toxic, harmless, nonirritating and good in biocompatibility and adhesion, can isolate bacteria, kill bacteria, fungi and viruses and prevent skin and mucous membranes from infection, can stop bleeding and keep the wound wet and further can promote skin regeneration and healing of the wound. The medical and antibacterial cationic biogel dressing can be widely used for preventing and treating infection of skin wound such as skin bruise, scalding, burning, bedsore, ulcer, vagina skin eczema and the like and local mucous membrane infection of an oral cavity, the throat, gingivae and the like and can relieve pains, inhibit bacteria, protect wound, promote wound healing and inhibit scarring.