41results about How to "Limit expansion" patented technology

The invention provides an internal curing process for improving the performance of high strength and slight expansion concrete, which comprises: mixing and stirring sand and stones, adding a gelled material, an expanding agent and a super absorbent resin; stirring the mixture for 30 seconds, adding water and a water reducer and stirring the mixture for 120 seconds; and filling the mixture into a mold. The water absorption of the super absorbent resin is between 150 and 300 times, the salt solution absorption capacity of the super absorbent resin is between 15 and 40 times, and the added amount of the super absorbent resin is 0.15 to 0.30 percent based on the mass of the gelled material. The process solves the problems of insufficient expansion rate, contraction, cracking and damages of later-stage secondary ettringite generation to the internal structure of the concrete, which are caused by curing. The internal curing technique effectively improves the moisture field in the concrete, the internal moisture content of the concrete and the hydration degree of the concrete, contributes to the full generation of the ettringite in the slight expansion concrete and improves the internal porous structure and compactedness of the concrete.

The invention discloses a method, a device and a system for near distance communication discovery. The method comprises steps: a discovery terminal receives discovery information allocated to a discovered terminal by a network side, wherein the discovery information comprises a discovery identifier, and the discovery information is sent to the discovered terminal by the network side; the discovery terminal uses the discovery identifier for calling or broadcasting; and the discovery terminal receives a response returned by the discovered terminal, and the discovered terminal is determined to be discovered.

The invention relates to a method for preparing a chitosan-silk fibroin composite nano-fiber multifunctional patch for promoting myocardial tissue regeneration and monitoring stem cells. The method comprises the following steps: preparing a cellulose nano-fiber basal plate by an electrostatic spinning technology; alternately assembling positively charged chitosan (CS) and negatively charged silk fibroin (SF) to the surface of nano-fibers layer by layer by adopting a layer-by-layer assembly technique, and assembling 5.5-10.5 layers to form a CS-SF composite nano-fiber membrane; and planting seed cells of adipose tissue-derived stromal cells or cardiac progenitor cells labeled by green fluorescent protein and firefly luciferase on the surface of the CS-SF composite nano-fiber membrane, preparing the patch by three-dimensional co-culture. The patch has excellent biocompatibility, can be used as a cell vector, has an effect of resisting oxidative stress to improve the survival rate and treatment efficiency of stem cells, and is capable of evaluating the number, distribution and function states of transplanted stem cells, effectively preventing occurrence of post-myocardial infarction heart failure and reducing the death rate of ischemic cardiomyopathy.

The invention relates to the technical field of pipelines, in particular to an expanded pressure-resistant pipe, which includes a hard outer sleeve and a flexible inner pipe; two ends of the inner pipe are respectively provided with a retaining ring, and the The outer surface is divided into a symmetrical left semi-arc surface and a right semi-arc surface along any plane passing through the axis line of the pipe, and the right semi-arc surface is provided with a raised part; the outer sleeve includes a left half-arc surface , the right half sleeve and the sliding sleeve; the right half sleeve is slidably connected to the outer wall of the left half sleeve along the direction around the axis of the pipe. The beneficial effect of the present invention is that the inner tube can adjust the internal pressure through adaptive expansion, and the outer sleeve has high corrosion resistance and hardness, which can prevent the inner tube from corroding and can evenly apply the external pressure to the The surface of the inner pipe prevents the inner pipe from being ruptured due to the inconsistency of internal and external pressure in a local area. The combination of the two can ensure that the pipe has high reliability and service life when used in the underground environment.

The invention provides a device and method for generating a high-flux planar light source. The electrode of the device is composed of a cylindrical anode and a coaxially arranged circular rod-shaped cathode. One end of the anode cylinder is closed, and the other end is made of quartz Transmission window air seal; the anode cylinder wall near the cathode emitting end has high-temperature gas outflow holes; the anode cylinder wall on both sides has cold gas inflow holes; the anode cylinder is filled with high-pressure inert gas; An axial magnetic field is applied in the cylinder; a DC constant current power supply is applied between the anode cylinder and the cathode, and an arc is ignited between the cathode emission end surface and the inner wall surface of the anode cylinder. The generation method is to drive the arc rotation and gas flow organization through the magnetic field, control the arc plasma configuration, the cathode arc root and the anode arc root configuration, and change the plasma configuration from the short-arc xenon lamp "bell jar shape" to "disk shape". ; The present invention limits the expansion of the plasma in the axial direction, increases the radial current density, and enhances the luminous power and luminous efficiency.

The invention relates to an inflatable film obstetric apparatus, belonging to the field of medical equipment. The inflatable film obstetric apparatus is characterized by comprising a casing and a control host, wherein the casing is a cylindrical sleeve which is composed of two layers of films and has two open ends, and a sealed inflation space is formed between the two layers of films. The inflatable film obstetric apparatus abandons the structure that a support arm of an original support rod is pushed open, the two layers of films are inflated by gas so as to wrap the head of a fetus, and the fetus is pulled out through the casing. The inflation volume and deflation volume are controlled by a control system and an inflation pump according to production processes; the structure of the inflatable film obstetric apparatus is reasonable; when the inflatable film obstetric apparatus is used, the fetus can not be injured; and the operation is very simple, the pain of a pregnant woman caused by delivery is reduced while the delivery process is accelerated, and thus the fetus is prevented from being injured in the delivery process. More than two one-way air supply valves are arranged on an inside film at the inner end, the one-way air supply valves only can supply air to the outside of the inflation space, and the one-way air supply valves directly correspond to the mouth and nose of the fetus, thereby ensuring the oxygen supply of the fetus and reducing the danger coefficient in delivery.

The invention discloses a method for preparing a key intermediate of baloxavir and the intermediate, which uses 3,4-difluoro-2-methylbenzaldehyde represented by formula (I) as a raw material and undergoes a bromination reaction , to obtain 3,4-difluoro-2-bromomethylbenzaldehyde shown in formula (II), and then obtain 3,4-difluoro-2-(((2-2-) shown in formula (Ⅲ) through substitution reaction Bromophenyl) thio) methyl)-benzaldehyde, and finally synthesize the target product through nucleophilic addition reaction, i.e. 7,8-difluorodibenzo[b,e]thia shown in formula (IV) Seven ring-11 (6H)-alcohol; Concrete reaction process is as follows:. The preparation method of the key intermediate of baloxavir provided by the present invention uses 2-bromothiophenol to replace the foul-smelling and highly toxic thiophenol, and reduces the reaction steps to 3-step reaction, which is a high-yield, low-cost , environmental protection and easy-to-operate preparation method.

The invention discloses an automatic ironing machine, comprising a body frame (1), the upper end of the body frame (1) is provided with a clothes conveying mechanism (2), and both sides of the clothes conveying mechanism (2) are provided with a clothes pressing mechanism (3) The side part of the body frame (1) is provided with an ironing mechanism (4), and the bottom side of the body frame (1) is provided with a clothes tensioning mechanism (5). The invention can automatically iron the wrinkled clothes, and the operation is simple and convenient to use.

The invention discloses a cement admixture for inhibiting alkali-aggregate reaction. The composition is as follows in parts by weight: 30-40 parts of waste glass powder, 15-20 parts of slag, 15-20 parts of slag, 3 parts of wool, 0.3-0.5 parts of gelatin, 3-5 parts of alkylbenzenesulfonate, 10-22 parts of lithium sulfate. After cleaning, airing and grinding waste glass bottles, mix them with slag and slag, and get the waste mixture through ball milling; mix the waste mixture with wool, alkylbenzene sulfonate, gelatin, and lithium sulfate evenly to obtain the inhibition Cement admixture for alkali-aggregate reaction. The invention has a simple preparation process, is convenient to use, has an obvious inhibitory effect on alkali aggregate reaction, is environmentally friendly, and the prepared concrete has excellent performance.