By using electron paramagnetic resonance and and (G01N24/10)

G   Physics(391163)
G01   easuring; testing(233827)
G01N24/10                     By using electron paramagnetic resonance (g01n0024120000 takes precedence);;(284)

ethod of determining antioxidant activity using electron paramagnetic resonance spectroscopy method // 2614365
FIELD: physics, measurement.SUBSTANCE: invention relates to physical and chemical analysis methods, particularly to analysis of solutions for quantitative determination of antioxidant activity. In the disclosed method, determination of antioxidant activity is carried out based on the difference in the number of paramagnetic particles of a stable radical, measured before and after chemical reaction of the particles of the radical with antioxidants.EFFECT: goal of the present invention is to overcome shortcomings of existing methods and create a new method, which improves accuracy and rapidness of determination, and enables to quantitatively, in standardised units, establish antioxidant activity of a certain substance in an analysed sample and a mechanism for interaction of antioxidants with free radicals of diphenyl picryl hydrazyl.4 dwg, 4 ex

Coherent superheterodyne electron paramagnetic resonance spectrometer // 2614181
FIELD: physics.SUBSTANCE: device comprises a signal 1 and a heterodyne 2 microwave generator, a measuring attenuator 3, a reference 4 and signal 5 channel mixer, a circulator 6, a measuring resonator 7 with an element for adjustment of its resonance frequency 8, a reference 9 and signal 10 channel intermediate-frequency amplifier, phase-frequency discriminators 11 and 12, frequency dividers 13 and 14, a reference generator 15, a frequency synthesis device 16, an analogue-to-digital converter 17, a sampling device 18, in-phase 19 and quadratic 20 channel decimation filters, a digital-to-analogue converter 21, an alternating current amplifier 22, a pulse demodulator 24 and a three-way switch 24.EFFECT: simple device and higher reliability.1 dwg

Coherent superheterodyne electron paramagnetic resonance spectrometer // 2579766
FIELD: physics.SUBSTANCE: invention relates to applied physics and can be used in making electron paramagnetic resonance (EPR) spectrometers. Spectrometer comprises signal 1 and heterodyne 2 microwave generators, measuring attenuator 3, mixer for reference 4 and signal 5 channels, circulator 6, measuring resonator 7 with its resonance frequency tuning element 8, reference amplifier 9 and 10 signalling channels, phase-frequency discriminators 11 and 12, frequency dividers 13 and 14, synchronous detectors 15 and 16, reference generator 17, frequency synthesis device 18, three-position switch 19, pulse modulator phase 20, alternating current amplifier 21 and pulse demodulator 22.EFFECT: technical result is high accuracy of automatic frequency tuning system of signal generator and resonant frequency of resonator.1 cl, 1 dwg

ethod of determining orientation of nv defects in crystal // 2570471
FIELD: nanotechnology.SUBSTANCE: method of determining the orientation of NV defect in a diamond crystal comprises placement of a sample of the diamond crystal in an external magnetic field, exposure to the sample to microwave radiation, the irradiation of the working volume of the sample with a focused laser radiation exciting in the working volume of the sample photoluminescence on which the signal of optically detected magnetic resonance (ODMR) is recorded, which is created by sweeping the frequency of the microwave radiation and the modulation of the external magnetic field. The ODMR spectra of NV defect are measured in a diamond crystal at different orientations of the diamond crystal relative to the external magnetic field. The received dependences of ODMR lines are compared with the calculated positions of the lines of NV defect in a diamond crystal in a magnetic field. Then, the orientation of the NV defect is determined on the value of the position deviation of the NV lines of the defect from the calculated position of the lines.EFFECT: method is simple to implement and does not require the use of a complicated device.3 dwg, 2 ex

Coherent superheterodyne electron paramagnetic resonance spectrometer // 2569485
FIELD: physics.SUBSTANCE: coherent superheterodyne electronic paramagnetic resonance spectrometer contains the voltage adder, the modulation generator, the synchronous detector, the phase shifter of the modulation signal and on-off switch, and the first phase shifter is designed controllable, and one of inputs of the voltage adder is connected to the common contact of the first section of the bipolar switch, the second - to the common contact of on-off switch, and the output - to the controlling frequency of the electrode of UHF signal generator, the output of the modulation generator is connected to one of the switchable contacts of on-off switch and with the modulation signal phase shifter input the output of which is connected to the reference input of the additional synchronous detector the signal input of which is connected to the output of the second synchronous detector, the frequency of the signal of the modulation generator is less than boundary frequency of PLL loop pass-band of the heterodyne generator, but greater than the boundary frequency of PLL loop pass-band of the signal generator.EFFECT: providing unambiguous, including automatic, configuring of phase ratios leading to exact separation of quadrature signal components.1 dwg

ethod of determining position of impurities of nitrate compounds in hydroxyapatite // 2554288
FIELD: chemistry.SUBSTANCE: method includes irradiating a hydroxyapatite sample with X-ray, gamma-radiation or electron beams, followed by recording, using an EPR technique, the resultant paramagnetic centres on a certified EPR spectrometer; calculating spectral characteristics of the observed EPR spectrum (number of observed lines and position thereof) while monitoring the measurement error and comparing the obtained spectral characteristics with spectral characteristics of nitrogen radicals; carrying out additional comparison of previously obtained spectral characteristics with spectral characteristics of nitrogen radicals in different positions substituting OH and(or) PO4 functional groups in the hydroxyapatite structure, particularly while allowing the determination of the point(s) of incorporation(substitution) of impurities of nitrogen compounds in the hydroxyapatite structure.EFFECT: enabling determination of positions of impurities of nitrogen compounds in hydroxyapatites.1 dwg

Coherent superheterodyne electron paramagnetic resonance spectrometer // 2548293
FIELD: radio engineering, communication.SUBSTANCE: invention relates to applied physics and can be used in making electron paramagnetic resonance (EPR) spectrometers. The spectrometer comprises signal 1 and heterodyne 2 microwave generators, a measuring attenuator 3, reference 4 and signal 5 channel mixers, a circulator 6 with a measuring resonator 7, reference 8 and signal 9 channel intermediate-frequency amplifiers, phase-frequency discriminators 10 and 11, frequency dividers 12 and 13, synchronous detectors 14 and 15, phase changers 16 and 17, a resonance frequency adjustment element of the measuring resonator 18, microwave power dividers 19 and 20, an operating mode three-way switch 12, a reference frequency synthesis device 22, a reference generator 23.EFFECT: simple device, smaller dimensions thereof, low power consumption and phase noise of the microwave generator.1 dwg

ethod of estimating quality of quartz raw material // 2525681
FIELD: chemistry.SUBSTANCE: application: for identification of the purest types of the quartz raw material. Essence of the invention consists in the following: selection of a monomineral sample of quartz, crushing and quartzification of three samples are carried out. Each sample is subjected to irradiation by γ-quanta with a dose of 10±1×106 Gr. In the first sample after irradiation the content of isomorphic structural Al-O centres in quartz is determined. The third sample before irradiation is subjected to temperature processing at 590-650°C for 20-30 min and the complete content of structural Al-O centres in quartz is determined. The third sample before irradiation is activated by SHF fields with power 700-800 W for 3-5 min, and subjected to temperature processing at 590-650°C for 20-30 min and the content of mobile structures of Al-O centres in quartz is determined. After that, an index of quartz washability, C1 - content of isomorphic structural Al-O centres in quartz, C2 -complete content of structural Al-O centres in quartz, C3 - content of mobile structural Al-O centres in quartz are determined, and if a value of washability index is 0.5-1, conclusion about high quality of the quartz raw material is made.EFFECT: increased accuracy and rapidity, as well as simplification of the process of estimation of the quartz raw material quality.1 tbl

ethod of determining impurities of nitrogen compounds in hydroxyapatite // 2465573
FIELD: chemistry.SUBSTANCE: hydroxyapatite sample is irradiated with X-ray, gamma or electron beams, followed by recording the EPR spectrum resulting from exposure of paramagnetic centres on a certified EPR spectrometre. Spectral characteristics the observed EPR spectrum (number of observed lines and their position) are calculated while monitoring measurement error and comparing the obtained spectral characteristics with known spectral characteristics of nitrogen radicals in (poly)crystalline compounds.EFFECT: possibility of qualitative and quantitative analysis of nitrogen compounds in substances with the structure of hydroxyapatites.2 dwg

Electron paramagnetic resonance spectrometre (versions) // 2411530
FIELD: physics.SUBSTANCE: first version of the electron paramagnetic resonance (EPR) spectrometre has a fixed frequency generator (1), a variable frequency generator (11), a first power divider (2), a second power divider (12), a third power divider (13), a channel switch (14), a first mixer (6), a second mixer (15), a low frequency amplifier (16), an oscilloscope (9), a circulator (3), a resonator (4), a magnetic system (5), an output direct current amplifier (7), a recording system (8) an a computer (10). The second version of the EPR spectrometer additionally has a low frequency power amplifier (17) and a frequency multiplier (18).EFFECT: possibility of visualising settings and easier tuning of frequency of the resonator with a sample at a fixed working frequency of the microwave generator.2 cl, 7 dwg

Electron paramagnetic resonance spectrometre // 2411529
FIELD: physics.SUBSTANCE: electron paramagnetic resonance spectrometre has a microwave generator (1) in the 90-100 GHz range, a microwave bridge (20), a system for transmitting microwave power to a sample in form of series-arranged first 3 mm waveguide (2), first horn antenna (3), at least one dielectric lens (4), second horn antenna (5) whose horn faces the horn of the first horn antenna (3), and a second 3 mm waveguide (6). The spectrometre also has a resonator (7), having a piston (8) and sample holder (9), a microwave signal detector (10), a synchronous detector (11), a magnetic field modulation generator (12), modulation coils (13), a magnetic field scan unit (14), a superconducting magnet (15), a cryogenic system (16) for maintaining temperature of liquid helium, having an optical window (17) and a control unit (18). The superconducting magnet (15), modulation coils (13), second horn antenna (5), second 3 mm waveguide (6) and resonator (7) are placed in the cryogenic system (16). The second horn antenna (5) is placed opposite the optical window (17) of the cryogenic system and is connected through the second 3 mm waveguide (5) to the resonator through a coupling aperture. The first horn antenna (3) and at least one dielectric lens (4) are fitted outside the cryogenic system (16) opposite its optical window (17).EFFECT: reduced heat losses in the cryostat and reduced amount of reflected microwave power.3 cl, 2 dwg

ethod of calibrating electron paramagnetic resonance spectrometre and calibration sample for realising said method // 2394230
FIELD: physics.SUBSTANCE: calibration sample is put into a measuring resonator, which gives an anisotropic spectrum (EPR), made from a rutile monocrystal TiO2 which contains Fe3+ ions in amount of 0.01-0.5 wt %. The calibration sample is turned in a magnetic field until appearance of an EPR anisotropic spectrum of Fe3+ ions whose lines are recorded and the EPR spectrometre is set using the said lines to maximum signal-to-noise ratio by moving the matching piston of the resonator and moving the bottom wall of the resonator in order to adjust the frequency of the resonator.EFFECT: simple process of tuning and calibrating an electron paramagnetic resonance spectrometre.4 cl, 2 dwg
ethod for control of magnetic admixtures content in nanodiamonds of detonation synthesis // 2388688
FIELD: nanotechnologies.SUBSTANCE: nanodiamond is placed into installation for annealing, hydrogen is passed through and maintained at the temperature selected from the range of (900÷1100) °C, cooled down to room temperature. X-ray diffraction pattern is taken. Additionally spectrum of electronic paramagnetic resonance (EPR) is registered at room temperature. Availability of metal phases is identified.EFFECT: invention makes it possible to increase sensitivity of magnetic admixtures content detection in nanodiamonds of detonation synthesis.2 cl, 6 ex

ethod of comparative estimation of physiological activity of pharmaceutical substances and preparations on their basis // 2329491
FIELD: medicine.SUBSTANCE: invention refers to pharmacy, namely identification, estimation of quality and safety of original and reproduced medical products. Described comparative estimation of physiological activity of original medical products and reproduced medical products or related preparations implies that by means of EPR spectroscopy and spin probes influence of these products on erythrocyte, lymphocyte and thrombocyte membrane structures released of the same blood sample depending on active component concentration in solution and contact time are examined by comparison of corresponding data obtained within concentration corresponding to maximum therapeutic dose.EFFECT: method enables comparing of pharmaceutical preparations - originals and generics, or pharmaceutical substances, with various impurity compounds, both within quality assessment and from the point of safety for patients.3 ex, 3 tbl

ethod of inspection of degree of lacing of polyethylene // 2310190
FIELD: inspection of degree of lacing of polyethylene.SUBSTANCE: tested and reference samples are placed into resonator of electron paramagnetic resonance spectrometer, spectrum of absorption of electron paramagnetic resonance is recorded. Amplitude of derivative and width of absorption line of tested and standard samples is found from spectrum recorded correspondingly to subsequent determination of degree of lacing from formula K=I'ΔH2mref/I'refΔH2 refm, where I' and I'ref are amplitudes of derivative of absorption line of tested and reference sample, ΔH and ΔHref is width of absorption lines of tested and reference samples, m and mref are masses of tested and reference samples.EFFECT: improved precision of inspection; simplified method of inspection; improved efficiency of operation.
A method of measuring the modulus carbon strings // 2205387
The invention relates to the field control of elastic properties of carbon fibers

Spin echo processor // 2189580
The invention relates to the field of radio and can be used in systems processing pulsed signals

The device for the precision rotation of an anisotropic sample relative to two orthogonal axes // 2137105
The invention relates to measurement techniques, in particular to the measurement of variable magnetic quantities of substances on the basis of electron paramagnetic resonance

Cell for studies of short-lived paramagnetic particles // 2120621
The invention relates to a device cells for studies of short-lived paramagnetic particles formed during electrolysis in the liquid by electron paramagnetic resonance and can be used for studies of the electronic structure of paramagnetic particles, electrochemical and photochemical reactions

The spectrometer electron paramagnetic resonance // 2095798
The invention relates to techniques for spectroscopy electron paramagnetic resonance (EPR) and may find application in studies by the EPR method in physics, chemistry, biology, etc

The spectrometer electron paramagnetic resonance // 2095797
The invention relates to techniques for spectroscopy electron paramagnetic resonance /EPR/ and can find application in studies by the EPR method in physics, chemistry, biology, Geology, medicine, etc
The method of identification sudden outburst of coal and gas // 2011975
The invention relates to the technique of electron paramagnetic resonance (EPR) and can be used in the coal industry in the development of coal seams in the classification of gas-dynamic phenomena
 
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