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7350results about "Material heat development" patented technology

Photoelectrochemical determination of chemical oxygen demand

A photoelectrochemical assay apparatus for determining chemical oxygen demand (COD) of a water sample which consists of a) a measuring cell for holding a sample to be analysed b) a titanium dioxide nanoparticle photoelectric working electrode and a counter electrode disposed in said cell, c) a UV light source adapted to illuminate the photoelectric working electrode d) control means to control the illumination of the working electrode e) potential measuring means to measure the electrical potential at the working and counter electrodes f) analysis means to derive a measure of oxygen demand from the measurements made by the potential measuring means. The method of determining chemical oxygen demand of a water sample, comprises the steps of a) applying a constant potential bias to a photoelectrochemical cell, containing a supporting electrolyte solution; b) illuminating the working electrode with a UV light source and recording the background photocurrent produced at the working electrode from the supporting electrolyte solution; c) adding a water sample, to be analysed, to the photoelectrochemical cell; d) illuminating the working electrode with a UV light source and recording the total photocurrent produced; e) determining the chemical oxygen demand of the water sample according to the type of degradation conditions employed. The determination may be under exhaustive degradation conditions, in which all organics present in the water sample are oxidised or under non-exhaustive degradation conditions, in which the organics present in the water sample are partially oxidised.
Owner:579453 ONTARIO INC

Device for determining heat-conductivity coefficient

The invention relates to a device for determining the heat-conductivity coefficient. The device comprises a testing cavity, a hot-end heating system, a cold-end cooling system, a vacuumizing system, a temperature acquisition system and a pressure control system, wherein a testing platform is arranged in the testing cavity; and the whole testing platform is of an upper-lower structure and is provided with a heating block, a down-pressing head, a sample to be tested, an upper pressing head and a cooling block in sequence from bottom to top. The device disclosed by the invention has the advantages that the horizontal temperature gradient of the sample to be tested is simulated by arranging multiple horizontal temperature-measuring points, the heat transferring characteristic of the sample to be tested is objectively reflected by multi-point temperature testing, and the more objective value of the heat-conductivity coefficient is obtained by means of data processing. Simultaneously, high-heat-conductivity flexible thin pieces are arranged between the sample to be tested and the pressing heads, so that the thermal contact resistance is reduced and the accuracy of the tested value is improved. In addition, a limiting ring is arranged between the pressing heads, so that the operability and the accuracy of the test in testing the flexible sample are guaranteed. The accuracy and the objectivity of the test for the heat-conductivity coefficient are greatly improved.
Owner:EVE RUBBER RES INST +1

A kind of measuring device and method of thin film thermoelectric performance parameters

The invention provides a device and a method for measuring thermoelectric parameters of a film. The measuring device, which has a symmetric structure, comprises a radiating fin, a thermoelectric module, a heat insulation material, metal round rods, a thermocouple wire, a voltmeter, a power supply, a data acquisition instrument and a computer. The measuring method provided by the invention comprises the following steps of: clamping a film to be measured between two upper and lower metal round rods which are completely same while the area of the film sample is the same as the cross-sectional area of the metal round rods, controlling the ambient temperature of the measuring device and the heat flow of the film sample by the use of the thermoelectric module, detecting and recording each performance parameter of the film thermoelectric material at real time by the use of the data acquisition instrument. The invention has the following advantages: the performance of the film thermoelectric material at different temperatures can be measured, that is to say, the same device can be utilized to simultaneously measure the thermal conductivity coefficient, Seebeck coefficient and conductance coefficient of the film thermoelectric material so as to calculate ZT values of the film thermoelectric material at different temperatures. According to the invention, the measuring device has a simple principle, is convenient to operate, is small in size, has many test functions and has high measuring precision.
Owner:SHANGHAI UNIV

Quasi-stable state method solid body thermal conductivity measurement instrument

The invention discloses a quasi-stable state method thermal conductivity measurement apparatus, which includes a direct-current power supply, a data acquisition processing system, two heating plates respectively connected to the direct-current power supply, four thermo-electric couples connected to the data acquisition processing system, four identical samples, seven soaking metal sheets and a measurement container stuffed with thermal insulation material. The thermal conductivity measurement apparatus is characterized in that the upper end of the measurement container is provided with a cover, screw threads are machined in the center of the cover and mounted with a bolt, the bolt presses a compressing metal plate above the heat preserving cover, to decrease the inside contact resistance. Two thin film heating plates with staggered structure are adopted, thereby heating on the samples are uniform. The soaking metal plate is provided with grooves, and the corresponding thermo-electric couples are fixed in the grooves by heat conducting glue, the soaking metal plate further uniforms the heat produced by the heating plate, and grooving on the sample is not needed during test, thereby the experimental investigation to different solid thermal conductivities can be conveniently executed.
Owner:XI AN JIAOTONG UNIV

Chemiluminescent detection of explosives, narcotics, and other chemical substances

ActiveUS6984524B2Rapidly and accurately discriminates among different substancesAccurate and reliable processChemical analysis using combustionMaterial heat developmentCollection systemDesorption
A compact scanning apparatus has an infrared laser adapted to emit light. The light is delivered as a beam by an optical system to illuminate an interrogation area on the surface of an object being scanned. Such illumination has sufficient intensity and duration to cause selective desorption of molecules of the contraband substance, which are present on the surface, without substantially damaging the surface. A collection system collects at least a portion of the desorbed molecules. At least a portion of the collected molecules is thermally decomposed to form NO2 and transferred to a reaction cell containing an aqueous, alkaline, luminol-containing solution. The NO2 reacts with the luminol to produce light by chemiluminescence. A light detector registers the presence of this light as indicative of the detection of the contraband substance, and activates a signaling device to provide an audible or visible alarm. The apparatus rapidly detects the presence of a wide variety of contraband substances in an accurate, reliable manner. It provides for automated screening, with the result that vagaries of human performance are virtually eliminated. False alarms are reduced and detection efficacy is increased. A traceable residue of the detected contraband is left on the article for use in forensic analysis.
Owner:CONTROL SCREENING
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