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195 results about "Black layer" patented technology

Black layer develops when oxygen levels in the soil drop because of saturated soil conditions. This normally occurs in low-cut, fine-turf areas and is especially damaging to turf roots. As the roots decline, turf health is seriously diminished, and thin, weak turf soon forms on the surface.

Distillation methods and devices in particular for producing potable water

The inventive device is embodied in the form of a chamber-oven for diffusing vapour and saturated hot air which circulate in a closed circuit by natural convection. Said device is embodied in the form of a domestic-use solar energy collecting device provided with a greenhouse whose surface is equal to 1 m2 and produces from 50 to 100 litres/day of distilled water. The device comprises a distillation unit arranged between two furnaces (59′, 79′) in a temperature-controlled container (48′). Said distillation unit comprises 100 flat thin hollow plates having a surface of 20 dm2 by face and an active volume of 200 dm3. The fine and tensioned walls (54) of said plates are provided with a hydrophilic coating (60′) and internal (56′) and inter-plate (58′) spaces. The lower chimney (59′) comprises a greenhouse (118′, 119′) whose bottom is embodied in the form of an impermeable black layer provided with a thin hydrophilic carpet on the rear part thereof. Saturated hot air at a temperature of 80° C. enters inside (56′) hollow plates from bellow and exits from the top at a temperature of 50° C. A high chimney (79′) is provided with a monoblock heat exchanger (84′) which is transversed by a non-potable water to be distilled which, afterwards is spread warm (40° C.) over the hydrophilic coating (60′). During passage through the heat exchanger (84) the air is cooled to 30° C. and moved down by gravity to the inter-plate spaces (58′) and exits therefrom at a temperature of 78° C. The distilled water condensed in the plates and by the heat exchanger is collected and removed. Brine is received in the bottom of the inter-plate space and distributed along the thin hydrophilic carpet of the bottom (122′) of the greenhouse. An air current passes along said hot carpet is heated and saturated and enters the plates. The brine liquor finally flows in an air-preheating tank (63′) which is emptied each morning. The greenhouse can be substituted by a heating tube transversed by a heating fluid or associated with another steam-jet tube. The more powerful chamber-ovens can produce at least 200 m3/day of distilled water for collective consumption. Said invention can be used for salt removal from seawater, co-generating electricity and potable water and for producing food concentrates.
Owner:THE THIRD MILLENIUM WATER

Lithium tantalate thin film infrared detector and manufacturing method

The present invention relates to a lithium tantalate film infrared detector and the preparing method thereof. The invention comprises the following components: an infrared filtering window, a resonance chopped wave modulator, a focusing lens, a pyroelectric lithium tantalate film infrared measuring probe, a heat sink cavity, a preamplifier, a low-pass filter, an electric power and signal output interface, a casing and an environment temperature detecting filter. The method for preparing the detector comprises the following steps: selecting a substrate, growing a SiO2 layer on the front and back surface, depositing Si3N4 layer on the front surface in sequence, sputtering a Ti layer, sputtering a photoetching Pt electrode layer, producing a lithium tantalate film layer, depositing a phototeching Al electrode layer, growing a photoetching SiNX antireflection layer and sputtering a black layer to complete the double unit structure infrared probe. The focusing lens is coated with an anti-reflection film. The infrared window is pasted with a narrowband filtering film. The preamplifier is built with a JFET tube or operational amplifier. The low-pass filter is built with an operational amplifier. The resonance chopped wave modulator is driven by piezoelectricity or electromagnet, and the resonance frequency is 1Hz-1000Hz.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Comprehensive prevention and control technology of corn waterlogging disaster

The invention discloses a comprehensive prevention and control technology of a corn waterlogging disaster, wherein soil ridging or compartment ridging regulation and control are utilized. The comprehensive prevention and control technology comprises the following steps: sowing in a wide and narrow row spacing manner during corn sowing, carrying out intertillage ridging or ditching during the five-leaf stage of corn, ditching in wide rows of corn and ridging in narrow rods of corn, or ditching in wide rows on the two sides of a compartment consisting of four or six rows, additionally applying nitrogen-oxygen mixed fertilizer instantly after the corn waterlogging disaster occurs, and spraying spermidine chemical modifier on leaf surfaces at the same time, wherein spraying is carried out once in the morning and night for 2-3 days continuously; other steps are the same as that during normal management, corn is harvested until bracts of corn clusters are dried up, corn grain milk lines disappear, and a black layer appears, namely when grains are completely and physiologically matured. According to the comprehensive prevention and control technology, through comprehensive precontrol advantages of prevention in advance and remedy after the disaster, the root oxygen deficiency after waterlogging can be effectively reduced and retarded, accumulated toxic effect of hazardous substances of soil is reduced, and the root growth and absorption capacity is strengthened, so that the symplastic growth of overground part and root system is promoted, and the yield is improved.
Owner:HENAN AGRICULTURAL UNIVERSITY

Grey micro-bead projection screen and manufacturing method thereof

The invention discloses a grey micro-bead projection screen which comprises a base material, a PVC black layer formed on one side of the base material and a functional film formed on the other side of the base material, wherein the functional film comprises a light absorption layer and micro-beads protruding out of the upper surface of the light absorption layer, and the functional film comprises, by mass, polystyrene 76%, matte grey coloring agent 2.5%, fire retardant 3%, bridging agent 6.2%, stabilizing agent 1%, defoaming agent 2.3%, wetting agent 3% and the balance micro-beads. The invention further discloses a manufacturing method of the grey micro-bead projection screen. The brightness of the projection screen is high, the gain is improved by more than 2.8 times, an effective scattering angle is larger than 32 degrees, and the grey micro-bead projection screen has the advantages of being high in definition and good in color reproduction and is a special screen for a home theater. Especially, the contrast ratio and black-grey contrast ratio can be well improved under the condition that the brightness is improved, and the perfect stainless frame effect is ensured. The screen surface has the advantages of being anti-corrosion, moisture-proof and flame-retarding, reducing longtime brightness decay and the like.
Owner:JIANGSU REDLEAF AUDIO & VISUAL EQUIP
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