The mathematical model of voltage transformers for the study of ferroresonant processes

Tygai, Yurii I.; Besarab, O. B.

doi:10.1109/ieps.2014.6874207

Cited by 9 publications

(12 citation statements)

References 3 publications

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“…Properties of magnetic nanoparticles and polymer clusters containing nanoparticles largely depend on the pro-perties of the magnetic material. One of the main properties is magnetic susceptibility χ m , which characterizes the dependence of the magnetization of a substance on the intensity of the external magnetic field H (Tygai et al, 2014;Wu et al, 2016;Tang et al, 2017): M = χ m × H. The characteristic magnetization curve for MPs is shown in Fig. 2.…”

Section: Characteristics Of Magnetic Particles and Methods For Obtainmentioning

confidence: 99%

Modern magnetic immunoassay: Biophysical and biochemical aspects

Galkin

Besarab

Pysmenna

et al. 2017

Regul. Mech. Biosyst.

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In this review article an analysis of the biochemical and biophysical aspects of modern magnetic immunoassay (MIA) is conducted and additionally the problems and perspectives of its application in biology, biotechnology and medicine are defined. Magnetic immunoassay should be considered as an evolutionary extension of the classical immunoassay. MIA can have many variants of modifications, similar to the classic immunoenzymatic assay. The key distinctive element of the MIA is the use of magnetic particles (MPs), which are usually nanoparticles. MPs in the MIA can act as a marker for detection, or the solid phase at which the immunochemical reaction takes place. MIA possesses basic advantages over classical immunoassay methods: thanks to the unique magnetic properties of the MPs and the ability to manipulate it in the external magnetic field, it is possible to increase the informative value of the analysis (first of all, sensitivity and specificity), as well as the rigid requirements for “purity” of tested samples. For the purposes of immunoassay, magnetic particles of size from 10 to 200 nm are important, since such particles are in a superparamagnetic state, in the absence of strong magnetic fields; they are not agglomerated in a liquid medium. The size of the spherical particle determines the rate of sedimentation and mobility in the solution. The outer polymeric membrane serves as a matrix in which the surface functional groups are added, and also protects the core of the metal from the external environment. The outer shell may also consist of agarose, cellulose, porous glass, silicon dioxide etc. There are several strategies for the synthesis of nanoparticles: mechanical (dispersion), physical (gas phase deposition), wet chemical methods (chemical comprecipitation, thermal decomposition, methods of micro emulsion, hydrothermal reactions) and physico-chemical methods. Also used are magnesite nanoparticles of biogenic origin. Magnetic particles may function, and this is important for immunoassay. Surface functional groups include carboxylic, amino, epoxy, hydroxyl, tosyl, and N-hydroxysuccinate-activated groups. Magnetic spherical particles usually interact with surface molecules such as streptovidine, biotin, protein A, protein G, and immunoglobulin etc. Directions and prospects of the development of methods of magnetic immunoassay are determined, mainly, by the development of methods for detecting or influencing magnetic particles. In this case, the classical methods of detection are electrochemical methods, electrochemiluminescence, fluorescence. More modern ones include giant magnetoresistance, superconducting quantum interference devices, surface-enhanced Raman spectroscopy, biosensors based on nonlinear magnetization, magneto-PCR immunoassay. The current trend is to combine or integrate the application of various biochemical, physical, molecular and genetic, physico-chemical detection methods. In fact, all of these benefits undoubtedly open up broad prospects for the practical application of MIA in biology, biotechnology and medicine.

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Section: Characteristics Of Magnetic Particles and Methods For Obtainmentioning

confidence: 99%

Modern magnetic immunoassay: Biophysical and biochemical aspects

Galkin

Besarab

Pysmenna

et al. 2017

Regul. Mech. Biosyst.

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“…In the structure of digital filters, the inertia is set discretely by the SyntA structural automaton, and the dynamic behaviour of the filters (their own transient process) depends on the information received from the input and from the output of the OCP circuit. The G OCP grammar differs from G RPA in (2,3) in that its elements have an oscillatory, harmonic output, while G RPA elements have a threshold output.…”

Section: Representation Of Ocp By Semantic Componentsmentioning

confidence: 99%

“…Within the framework of the smart grid concept, all the necessary algorithms for relay protection and automation (RPA) devices are in the foreground, and the equipment that controls the operation of the OCP (Figure 1) is at the second level. It implies the possibility of describing the properties of OCP electrical circuits through control algorithms [1][2][3][4][5][6][7][8][9]. Such a structural-informational (SI) method is developed by the author further [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Automatic Control of the Structure of Dynamic Objects in High-Voltage Power Smart-Grid

Никифоров¹

2021

Automation and Control

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The control and protection algorithms for the considered class of dynamic facilities with a tunable structure are considered. Their relevance follows from the concepts of the development of the electric power industry-smart grid, digital substation and outsourcing services. The properties of this class of dynamic objects are spatial distribution, many options for changing the structure and motion in vibrational circuits at natural frequencies from ultra-high to ultra-low. The input coordinate of the dynamic objects is the vector of the change in the structure of the object. The output coordinate is the power of a special semantic signal about the state of the facilities. Their management is carried out as part of the stabilisation system of the normal operation of the facility. Stabilisation is achieved by the criterion of the minimum deviation of the power of the semantic signal from the 'normal mode' setting of operation. Executive bodies rebuild the structure of the dynamic facility in a pulsed, programmatic way, using the possibilities of self-healing and resource reservation. If stabilisation is not possible, the damaged area is excluded from the facility. The problem of the stability of the system turned out to be the lack of sufficient information about the state of the object and the similarity of the structure and significance of unrecognisable semantic situations to the main situations. Control algorithms are synthesised by the developed structural-informational (SI) method of dynamic pattern recognition.

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“…Часткове розземлення нейтралей силових трансформаторів 110-220 кВ застосовується в якості ефективного заходу обмеження струмів однофазного короткого замикання, які складають основну частину в загальній кількості коротких замикань [1][2][3][4]. Розземлення нейтрали частини силових трансформаторів системи призводить до необхідності захисту ізоляції нейтрали від впливів на неї в процесі експлуатації перенапруг [5][6][7].…”

Section: перенапруги на нейтралі силових трансформаторів 110-220 квunclassified

“…В даний час захист ізоляції розземленої нейтралі здійснюється за допомогою ОПН, характеристики яких вибираються виходячи із забезпечення вимоги надійного захисту ізоляції від грозових і комутаційних перенапруг, і, в той же час, запобігання ушкодження самих ОПН від можливих квазістаціонарних перенапруг на нейтралі. У Україні виробництвом ОПН, призначених для захисту ізоляції разземлених нейтралей від грозових і комутаційних перенапруг, займаються багато підприємств, в каталогах продукції яких такі апарати позначаються «ОПН-Н», що задовольняють умовам експлуатації мереж 110-220 кВ [2][3][4][5].…”

Section: перенапруги на нейтралі силових трансформаторів 110-220 квunclassified

Перенапруги На Нейтралі Силових Трансформаторів 110-220 Кв

Колісник¹,

Кучанський²

2020

Сучасний Стан Та Перспективи Розвитку Науки - Том 6

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The mathematical model of voltage transformers for the study of ferroresonant processes

Cited by 9 publications

References 3 publications

Modern magnetic immunoassay: Biophysical and biochemical aspects

Modern magnetic immunoassay: Biophysical and biochemical aspects

Automatic Control of the Structure of Dynamic Objects in High-Voltage Power Smart-Grid

Перенапруги На Нейтралі Силових Трансформаторів 110-220 Кв

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