52results about How to "Low risk" patented technology

The invention relates to a construction method of an underground continuous wall below a viaduct. The method specifically includes the first step of staking out in a survey, the second step of guiding wall manufacturing, the third step of width adjustment of the underground continuous wall, the fourth step of slurry preparation, the fifth step of grooving construction, the sixth step of reinforcement cage manufacturing, hoisting and releasing, the seventh step of concrete grouting, the eighth step of repeatedly executing the fifth step, the sixth step and the seventh step till construction of a to-be-formed single-width undergrou nd continuous wall construction unit ends, and the ninth step of underground continuous wall joint processing. By means of the construction method, construction of the underground continuous wall can be fast completed while the quality and the quantity are guaranteed, and a viaduct pier will not be affected. Compared with a cast-in-situ bored pile construction method, the construction method has the beneficial effects that construction speed is high in the construction progress, stratum disturbance is small, and therefore the influences on the viaduct pier are small.

The invention relates to a method for determining a medium-and-large-radius track of a two-dimensional small-pre-target-displacement horizontal well. The method sequentially comprises the following steps that the position of a first target spot, the position of a second target spot and the position of a wellhead are determined, the displacement and the true vertical depth of the first target spot and the displacement and the true vertical depth of the second target spot are obtained, a third-part horizontal segment rail is determined, and the third horizontal segment track extends along a connecting line between the first target spot and the second target spot; a second-part angle-gain landing track is determined upwards with the first target spot as a terminal point, and the second-part angle-gain landing track comprises a first angle-gain circular-arc segment, an angle-holding linear segment and a second angle-gain circular-arc segment; a reverse angle-building track is determined with the wellhead as a starting point and the track midpoint as a terminal point, the reverse angle-building track comprises a plumb shaft segment, a reverse angle-building circular-arc segment, an angle-holding linear segment and an angle-dropping circular-arc segment, and the radius values of all the circular-arc segments range from 191 m to 286.5 m. According to the method for determining the medium-and-large-radius track of the two-dimensional small-pre-target-displacement horizontal well, the pre-target displacement is increased through reverse angle building, and the contradiction between the complex ground conditions and well location optimization of the horizontal well with the medium-and-large-radius track can be solved.

The invention discloses concrete lightweight aggregate and a preparation method thereof. The concrete lightweight aggregate is prepared from the following raw materials by mass percent: 60-80% of oil-base drilling cuttings, 10-30% of civil sludge, 0.8-7% of a pore-forming agent and 9-9.3% of water. The preparation method comprises the following steps: (1) evenly mixing the dry oil-base drilling cuttings with the civil sludge and the pore-forming agent, and then carrying out ball-milling on the obtained mixture to obtain a raw material; (2) putting the prepared raw material into an automatic ball forming mill for balling, evenly sprinkling water in a balling process, aging the prepared green body after balling is finished, and then drying; (3) calcining the dried green body, and then cooling the product along with a furnace so as to obtain the concrete lightweight aggregate. The main raw materials of the concrete ceramsite lightweight aggregate prepared by the method are solid wastes, and all technical indexes of the concrete ceramsite lightweight aggregate meet the related requirements of standard in China; furthermore, the concrete lightweight aggregate is good in leaching resistance, does not cause secondary pollution and low in cost, thus having better industrial application prospect.

The present invention discloses a low-voltage power supply system fault diagnosis training device, which is composed of a three-phase isolation transformer, a three-phase circuit breaker, a simulated fault connector, a simulated load, a switch, a grounding plate and a simulated grounding resistor. These components are connected with each other via connecting wires. The device of the invention can reduce the teaching difficulty and increase the teaching efficiency for the courses of the electricity-supply major. The device is also highly safe and reliable.

The invention relates to the field of application of biological materials, and discloses application of a degradable composite material in oil absorption, and the degradable composite material comprises a three-dimensional network structure formed by fungal hyphae and at least one lignocellulose fragment fixed by the three-dimensional network structure. The degradable composite material has good oil absorption performance and has good application potential in the aspects of petroleum leakage, removal of oil stains on water, treatment of oily wastewater and the like. On the other hand, the problem of treatment of agricultural residues such as straw and wood chips and forestry residues can be solved, the additional value of the residues is increased, environmental pollution is reduced, and coordinated development of economy, ecological environment and society is facilitated.

Various exemplary embodiments relate to a method for identifying a short circuit in a first light emitting diode element (50). In said method, the first light emitting diode element (50) is operated in the reverse mode. Verification is made as to whether an electric current (IR) flows in the reverse direction across the light emitting diode element (50), and the short circuit is identified if said verification indicates that the current (IR) flows in the reverse direction and is greater than a given leakage current.

The invention provides a concrete surface protection treatment method based on a plasma hot-spraying technology. According to the treatment method, firstly, high-pressure air at the temperature of 80DEG C to 100 DEG C is utilized to dry the surface of concrete; next, the high-pressure air is utilized to wrap and carry particles to roughen the surface of the concrete; then, high-pressure air at the temperature of 100 DEG C to 150 DEG C is utilized to flush and preheat the surface of the concrete; and finally, by the aid of plasma hot-spray equipment, a powdery inorganic non-metallic raw material with the particle size of 20 microns to 120 microns is used for hot-spraying an inorganic material protection layer on the surface of the concrete by adjusting the powder feeding rate, plasma power, the airflow rate, the moving velocity, the spraying distance and other parameters. Through the treatment method, the anti-freezing and anti-permeating abilities of the concrete are improved, the defects of poor weather fastness and short service life in traditional organic material protection coating brushing are overcome, and the method can be widely applied to surface protection on concrete prefabricated parts and cast-in-place concrete structures.

An exhalation valve device (22) for a ventilator apparatus for the artificial respiration of patients can be flowed through in an exhalation flow direction (E) and comprises: an upstream breathing gasduct (54), which extends along a first duct path (K1) and is or can be connected to a section of the exhalation line coming from the patient, a downstream breathing gas duct (58), which extends alonga second duct path (K2) and is or can be connected to a breathing gas sink (U), a valve assembly (63) having a valve body (64) and a valve seat (66), which valve assembly is provided between the upstream and the downstream breathing gas ducts (54, 58) such that, in the event of a predetermined first breathing gas overpressure in the upstream gas duct (54) relative to the downstream gas duct (58),the valve assembly permits an exhalatory breathing gas flow from the upstream breathing gas duct (54) to the downstream breathing gas duct (58) and, in the event of a predetermined second breathing gas overpressure in the downstream breathing gas duct (58) relative to the upstream breathing gas duct (54), the valve assembly blocks a gas flow from the downstream breathing gas duct (58) to the upstream breathing gas duct (54). According to the invention, the exhalation valve arrangement (22) has a bypass chamber (74) that communicates via flow mechanics with the upstream breathing gas duct (54)and extends from the upstream breathing gas duct (54) to the region of the downstream breathing gas duct (58) and there is designed for coupling a gas pressure sensor (80).

The invention relates to a method for improving grassland productivity on the basis of a livestock-poultry-pasture coupling mode. The method includes the following steps that deteriorated grassland with the vegetation coverage degree not higher than 50% or grassland with the grasshopper density being 10 grasshoppers per square meter or above is selected for stocking, and it is required that the height of a plant community is smaller than 30 cm to guarantee that poultry can see poultry houses; the stocking density and the scale of the poultry and distribution positions of the poultry houses are determined according to the use area of the selected grassland and the poultry raising aim, and the distance between the poultry houses are adjusted according to the determined stocking density of the poultry; after young poultry are subjected to heat supplication stopping and then freely raised on the selected grassland by means of the poultry houses, sufficiency drinking water supply is guaranteed in the daytime, and feed is supplemented at night; the poultry houses are moved every 1-2 months according to vegetation conditions and soil conditions of grazing pasture, and accumulated faeces are evenly scattered around the poultry houses; poultry eggs and poultry products are harvested; after the stocking period of the poultry ends, added forage is harvested and/or cattle and sheep are grazed.