92 results about "Dissolved nitrogen" patented technology

A method for producing titanium powder containing a solid-soluted nitorogen comprises the step of heating titanium powder comprised of titanium particles in a nitrogen-containing atmosphere to dissolve nitrogen atoms and form a solid solution of nitrogen atom in a matrix of the titanium particle.

Disclosed is a substrate cleaning method for removing particles from a substrate includes a first step of adjusting the concentration of dissolved nitrogen in pure water, so as to be less than or equal to the concentration of dissolved nitrogen in equilibrium with the atmosphere (about 16 ppm), in a supply line that supplies the pure water, and a second step of cleaning a substrate by supplying a cleaning tank with a cleaning solution produced by mixing at least hydrogen peroxide with the pure water adjusted at the first step, and applying an ultrasonic wave to the cleaning solution in which the substrate is immersed.

The invention relates to a technique for treating polluted environment, which in detail is a comprehensive ecological restore method especially for etrophication waters in temperate zone in part of China. It combines the cultivation of large scale of algae and culture filter feeding animal of in etrophication waters to build a biological filter device and then restore polluted environment. The invention makes full use of ecological function of large scale algae absorbing dissolved nitrogen and phosphorus in large amount and ecological function of filter feeding animal filtering suspended particle and nutrient matter from water, to restore etrophication waters. The applied algae and filter feeding animal are important economical varieties, thus they can also bring economical benefit. The invention is characterized by both ecological benefit and economical benefit and suitability for etrophication waters in temperate zone in north of China.

The invention relates to a synthetic method for 2-(2'-hydroxy-methylphenyl) benzotriazole (UV-P). The method comprises the following steps: (1) with an azo intermediate (II) as a raw material and sodium sulfide as a reducing agent, carrying out a reduction reaction in an organic solvent so as to obtain an organic solution with dissolved nitrogen oxide (III); and (2) with the organic solution containing dissolved nitrogen oxide (III) obtained in the step (1) as a raw material, carrying out a catalytic reduction hydrogenation reaction in the presence of a reducing catalyst so as to obtain the UV-P (I). Compared with the prior art, the invention has the following advantages: the two-step reduction method is adopted, the azo intermediate (II) is used as the raw material for preparation of the UV-P, and yield of the UV-P is as high as more than 80%; the organic solvent is easy to recover, the application amount of sodium hydroxide is small, and little environmental pollution is produced; cost is low, post-treatment is convenient, and large scale production can be easily carried out.

A method for measuring the concentration of gas dissolved in a liquid, in which a test liquid is introduced into a liquid phase chamber (3) separated with a gas permeation membrane (2), and the degree of vacuum of the gas phase in equilibrium with the liquid phase is measured while condensed liquid in a gas phase chamber (4) is discharged to the outside continuously; an apparatus for measuring the concentration which has a closed vessel (1), (2) disposed in (1) and separates (1) for introducing the test liquid and (3) and (4) having a pressure gauge (8) and an outlet pipe for discharging condensed liquid (7), the degree of vacuum in (3) being measured by (8); and an apparatus for producing water containing dissolved nitrogen gas. The concentration of gas dissolved in a liquid flowing through a flow route can be measured with stability for a long time.

The invention discloses a method and device for extracting soil dissolved nitrogen. The method comprises the following steps: A, collecting soil samples, namely recording morphological characteristic information such as soil colors, structures, textures, consistence and new growth bodies according to soil genetic horizon, placing the samples into a closed plastic bag, putting into a refrigerator, and keeping the samples in a dark place; B, culturing soil, namely bringing cutting ring samples back to a laboratory, developing the measurement of field water capacity values of the soil, placing the samples into a constant temperature and humidity incubator, and culturing in the dark place; C, centrifuging the samples, namely taking out the soil samples, completely transferring the samples to an acrylic cloth bag, sealing the bag opening, putting into a polypropylene centrifuge bottle, tightly screwing a bottle cover, and treating in an ultra-high-speed refrigeration centrifuge to obtain a soil solution; D, sub-packaging and storing the solution; and E, performing analytic determination, wherein a polypropylene bottle cover and a polypropylene solution collecting box are connected with a polypropylene bottle body by virtue of screw threads, and a filtration separation plate is connected with the polypropylene bottle body. The method disclosed by the invention is feasible, is simple and convenient to operate, wide in applicability, stable and reliable in measured data results, high in accuracy and good in repeatability, and ensures that the composition and content of different soil dissolved nitrogen can be accurately measured.

An ink composition is provided which has excellent initial filling characteristics and continuous printing stability even in the case of an ink composition (for example, dissolved nitrogen is equal to or greater than 5 ppm) which is almost not deaerated or an ink composition (for example, dissolved nitrogen is equal to or greater than 7 ppm) which is not deaerated at all. The ink composition includes an alkylene oxide adduct (A) of acetylenic glycol in which a main chain has 12 or more carbon atoms, acetylenic glycol (B) in which a main chain has 10 or more carbon atoms, and polyoxyalkylene alkyl ether (C).

The invention discloses a permeable barrier and an ecological landscape water in-situ remediation method using the permeable barrier. The permeable barrier comprises a filtering material layer, a gravel layer and a gabion box, wherein the width of the filtering material layer is gradually changed; a layer of biological membrane is attached to the surface of the filtering material layer; the gravellayer is arranged on the outer side of the filtering material layer; the gabion box coats the outer side of the gravel layer; an impermeable material layer is laid at the upper end faces of the filtering material layer, the gravel layer and the gabion box; a soil layer is arranged on the impermeable material layer; plants are planted on the soil layer. According to the ecological landscape waterin-situ remediation method disclosed by the invention, adsorption and filtering of suspended particulate matters and dissolved nitrogen and phosphorus in a water body can be enhanced and the purification efficiency of water quality is improved; in addition, in the ecological landscape water in-situ remediation method, a plurality of permeable barriers are arranged in an ecological pond in a staggered manner, so that water current moves forward in a baffling form, and further the contact time between a water body and submerged plants can be prolonged; by dual filtering of the water body, the purification efficiency of the water quality is further improved.