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  JOURNAL "NP" ISSUES

"Nauchnoe Priborostroenie", 2025, Vol. 35, no. 3. ISSN 2312-2951

"NP" 2025 year Vol. 35 no. 3.,   ABSTRACTS

ABSTRACTS, REFERENCES

A. S. Berdnikov1, S. V. Masyukevich1, K. V. Solovyev1, 2, Yu. I. Khasin1

ELECTRIC FIELDS OF CYLINDRICAL RF ION GUIDES

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 3—17
EDN: MXKPEJ
 

The article considers analytical expressions for the potentials of electric fields that correspond to cylindrical RF channels. The electrodes of such channels are a sequence of identical flat diaphragms, in the particular case of circular diaphragms with apertures of constant radius. The obtained expressions allow one to estimate the disturbances of the transporting electric fields when approaching the edges of the electrodes and can be useful for qualitative simulation of RF devices designed for isolation, transporting and focusing of ions.
 

Keywords: analytical solutions of the Laplace equation, electric RF fields, electron-optical systems with periodic electrodes, ion guides

Author affiliation:

1Institute for Analytical Instrumentation of RAS, Saint Petersburg, Russia
2Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia

 
Contacts: Berdnikov Alexander Sergeevich, asberd@yandex.ru
Article received by the editorial office on 05.05.2025

Full text (In Russ./In Eng.) >>

REFERENCES

  1. Yavor M.I. Optics of charged particle analyzers. Advances in Imaging and Electron Physics (Book Series). Amsterdam, Academic Press, 2009, vol. 157, pp. 142—168.
  2. Gerlich D. Inhomogeneous RF fields: A versatile tool for the study of processes with slow ions. Advances in Chemical Physics: State-selected and state-to-state ion—molecule reaction dynamics. Part 1: Experiment (Book Series). New York, John Wiley & Sons Inc., 1992, pp. 1—176.
    DOI: 10.1002/9780470141397.ch1
  3. Sysoev A.A., Berdnikov A.S., Masyukevich S.V., So-lovyev K.V., Krasnova N.K. [Analytical study of operating modes of RF ion funnels in the gas dynamic interfaces of tandem triple-quadrupole mass-spectrometers]. Nauchno-tekhnicheskie vedomosti SPBGPU. Fiziko-matemati-cheskie nauki [St. Petersburg State Polytechnical University Journal. Physics and Mathematics], 2023, vol. 16, no. 4, pp. 134—145. DOI: 10.18721/JPM.16411 (In Russ.).
  4. Berdnikov A.S., Masyukevich S.V. [Analytical potentials of electric fields for simulation of ion guides with a periodic structure]. Nauchnoe Priborostroenie [Scientific Instrumentation], 2024, vol. 34, no. 1, pp. 107—116. URL: http://iairas.ru/mag/2024/abst1.php#abst9 (In Russ.).
  5. Áepäíèêoâ A.C., Macþêeâè÷ C.B., Ïoìoçoâ T.B., Õacèí   Þ.È., Coëoâüeâ K.B. Aíaëèòè÷ecêèe ïoòeí­öèaëû ýëeêòpè÷ecêèõ ïoëeé äëÿ ìoäeëèpoâaíèÿ ìóëüòèïoëüíûõ paäèo÷acòoòíûõ èoííûõ âopoíoê c íeëèíeéíûì ïpoôèëeì // Haó÷ío-òeõíè÷ecêèe âeäoìocòè CÏáÃÏÓ. Ôèçèêo-ìaòeìaòè÷ecêèe íaóêè. 2024. T. 17, ¹ 2. C. 94—119. DOI: 10.18721/JPM.17208
  6. Bahr R. Diplom thesis. University of Freiburg. 1969.
  7. Gerlich D. Diplom thesis. University of Freiburg. 1971.
  8. Teloy E., Gerlich D. Integral cross sections for ion-molecule reactions. Part I. The Guided beam technique. Chemical Physics, 1974, vol. 4, no. 3, pp. 417—427.
    DOI: 10.1016/0301-0104(74)85008-1
  9. Gerlich D., Kaefer G. Ion trap studies of association processes in collisions of CH3+ and CD3+ with n-H2, p-H2, D2 and He at 80 K. The Astrophysical Journal, 1989, vol. 347, no. 2, pp. 849—854. DOI: 10.1086/168174
  10. Berdnikov A.S., Gall N.R. [Radio frequency ion guiding traps with periodical electrodes without spurious trapping regions]. Mass-spektrometriya [Mass-spectrometry], 2013, vol. 10, no. 4, pp. 224—229. URL: http://mass-spektrometria.ru/pre-t10n4-radiochast/ (In Russ.).
  11. Watson G.N. A Treatise on the Theory of Bessel Functions. Cambridge, Cambridge University Press, 1922. 804 p. (Russ. ed.: Vatson Dzh.N. Teoriya besselevykh funktsii. Transl. from eng. Moscow: Izdatel'stvo inostrannoi literatury, 1949. 799 p.).
  12. Bateman H., Erdei A. Higher Transcendental Functions. Vol. 2. McGrow Hill book company, 1953. 396 p. (Russ. ed.: Beitmen G., Ehrdeii A. Vysshie transtsendentnye funktsii. T. 2: Funktsii Besselya, funktsii parabolicheskogo tsilindra, ortogonal'nye mnogochleny. Seriya "Spravoch-naya matematicheskaya biblioteka". Izd. 2-e. Moscow: Nauka Publ., 1974. 296 p.).
  13. Abramowitz M., Stegun I.A. Handbook of Mathematical Functions With Formulas, Graphs, and Mathematical Tables. National Bureau of Standards Applied Mathematics Series, 1964. 1046 p. (Russ. ed.: Abramovits M., Stigan I. Spravochnik po spetsial'nym funktsiyam s formulami, grafikami i matematicheskimi tablitsami. Moscow: Nauka Publ., 1979. 832 p.).
  14. Andreeva A.D., Berdnikov A.S. [Mass spectrometric devices with archimedean radio frequency electric fields]. Mass-spektrometriya [Mass-spectrometry], 2011, vol. 8, no. 4, pp. 293—296. (In Russ.).
    URL: http://mass-spektrometria.ru/pre-8n4-pismo/
  15. Berdnikov A.S. [High frequency electromagnetic fields with ‘Archimedean’ properties which are calculated taken Maxwell’s terms into account]. Nauchnoe Priborostroenie [Scientific Instrumentation], 2014, vol. 24, no. 1, pp. 104—127. URL: http://iairas.ru/mag/2014/abst1.php#abst13 (In Russ.).
  16. Berdnikov A.S., Andreeva A.D. Ustroistvo dlya manipulirovaniya zaryazhennymi chastitsami. Patent RF no. RU 113611U1 [Patent for device for manipulating charged particles]. Prioritet 05.05.2011.
    URL: https://patents.google.com/patent/RU113611U1/ru (In Russ.).
  17. Berdnikov A.S., Andreeva A.D. Ustroistvo dlya manipulirovaniya zaryazhennymi chastitsami. Patent RF no. RU 2465679C1 [Patent for apparatus for manipulating charged particles]. Prioritet 05.05.2011. URL: https://patents.google.com/patent/RU2465679C1/ru (In Russ.).
  18. Lavrent'ev M.A., Shabat B.V. Metody teorii funktsii kompleksnogo peremennogo . Izd. 3-e, ispr. [Methods of the theory of functions of complex variable. Ed. 3rd]. Moscow, Nauka Publ., Gl. red. fiziko-matematicheskoi lit-ry, 1965. 716 p. (In Russ.).
 

A. S. Berdnikov1, S. V. Masyukevich1, T. V. Pomozov1, K. V. Solovyev1, 2

SIMULATION OF CYLINDRICAL RF ION GUIDES
USING ANALYTICAL ELECTRIC FIELDS

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 18—37
EDN: QQNXYE
 

The article explores the qualitative properties of cylindrical radio frequency ion guides used to convey ions. Analytical expressions for electric fields obtained earlier, and the theory of pseudo-potential motion of charged particles in RF electric fields, are used here. Different operating modes of RF ion guides are considered: with a phase π for RF voltages applied between neighboring electrodes, with a phase π/2 for RF voltages applied between neighboring electrodes, with 100% sinusoidal amplitude modulation of sinusoidal RF voltages to provide the A-wave effect. The influence of high order nonlinear spatial harmonics of the considered electric fields for isolation, transportation and focusing of charged particles (ions) is investigated as well.
 

Keywords: analytical solutions of the Laplace equation, electric RF fields, electron-optical systems with periodic electrodes, ion guides

Author affiliation:

1Institute for Analytical Instrumentation of RAS, Saint Petersburg, Russia
2Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia

 
Contacts: Berdnikov Alexander Sergeevich, asberd@yandex.ru
Article received by the editorial office on 05.05.2025

Full text (In Russ./In Eng.) >>

REFERENCES

  1. Berdnikov A.S., Masyukevich S.V., Solovyev K.V., Khasin Yu.I. [Electric fields of cylindrical RF ion guides]. Nauchnoe Priborostroenie [Scientific Instrumentation], 2025, vol. 35, no. 3, pp. 3—17. (In Russ.).
  2. Sysoev A.A., Berdnikov A.S., Masyukevich S.V., So-lovyev K.V., Krasnova N.K. [Analytical study of operating modes of RF ion funnels in the gas dynamic interfaces of tandem triple-quadrupole mass-spectrometers]. Nauchno-tekhnicheskie vedomosti SPBGPU. Fiziko-matemati-cheskie nauki [St. Petersburg State Polytechnical University Journal. Physics and Mathematics], 2023, vol. 16, no. 4, pp. 134—145. DOI: 10.18721/JPM.16411 (In Russ.).
  3. Berdnikov A.S., Masyukevich S.V. [Analytical potentials of electric fields for simulation of ion guides with a periodic structure]. Nauchnoe Priborostroenie [Scientific Instrumentation], 2024, vol. 34, no. 1, pp. 107—116. URL: http://iairas.ru/mag/2024/abst1.php#abst9 (In Russ.).
  4. Berdnikov A.S., Masyukevich S.V., Pomozov T.V., Khasin Yu.I., Solovyev K.V. [Analytical electric potentials for simulation of the multipole radiofrequency ion funnels with nonlinear profiles]. Nauchno-tekhnicheskie vedomosti SPBGPU. Fiziko-matematicheskie nauki [St. Petersburg State Polytechnical University Journal. Physics and Mathematics], 2024, vol. 17, no. 2, pp. 94—119.
    DOI: 10.18721/JPM.17208 (In Russ.).
  5. Gerlich D. Inhomogeneous RF fields: A versatile tool for the study of processes with slow ions. In: Ng C.-Y., Baer M., Prigogini I., Rice S.A., editors. Advances in Chemical Physics: State-selected and state-to-state ion—molecule reaction dynamics. Part 1: Experiment (Book Series, vol. 82), New York, John Wiley & Sons Inc., 1992, pp. 1—176. DOI: 10.1002/9780470141397.ch1
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    DOI: 10.1016/0301-0104(74)85008-1
  33. Gerlich D., Kaefer G. Ion trap studies of association processes in collisions of CH3+ and CD3+ with n-H2, p-H2, D2 and He at 80 K. The Astrophysical Journal, 1989, vol. 347, no. 2, pp. 849—854. DOI: 10.1086/168174
  34. Watson G.N. A Treatise on the Theory of Bessel Functions. Cambridge, Cambridge University Press, 1922. 804 p. (Russ. Ed.: Vatson Dzh.N. Teoriya besselevykh funktsii. Transl. from eng. Moscow: Izdatel'stvo inostrannoi literatury, 1949. 799 p.).
  35. Bateman H., Erdei A. Higher Transcendental Functions. Vol. 2. McGrow Hill book company, 1953. 396 p. (Russ. Ed.: Beitmen G., Ehrdeii A. Vysshie transtsendentnye funktsii. T. 2: Funktsii Besselya, funktsii parabolicheskogo tsilindra, ortogonal'nye mnogochleny. Seriya "Spravoch-naya matematicheskaya biblioteka". Izd. 2. Moscow: Nauka Publ., 1974. 296 p.).
  36. Abramowitz M., Stegun I.A. Handbook of Mathematical Functions With Formulas, Graphs, and Mathematical Tables. National Bureau of Standards Applied Mathematics Series, 1964. 1046 p. (Russ. Ed.: Abramovits M., Stigan I. Spravochnik po spetsial'nym funktsiyam s formulami, grafikami i matematicheskimi tablitsami. Moscow: Nauka Publ., 1979. 832 p.).
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  38. Andreeva A.D., Berdnikov A.S. [Mass spectrometric devices with archimedean radio frequency electric fields]. Mass-spektrometriya [Mass-spectrometry], 2011, vol. 8, no. 4, pp. 293—296. (In Russ.). URL: http://mass-spektrometria.ru/pre-8n4-pismo/
  39. Berdnikov A.S. [High frequency electromagnetic fields with "Archimedean" properties which are calculated taken Maxwell’s terms into account]. Nauchnoe Priborostroenie [Scientific Instrumentation], 2014, vol. 24, no. 1, pp. 104—127. URL: http://iairas.ru/mag/2014/abst1.php#abst13 (In Russ.).
  40. Berdnikov A.S., Andreeva A.D. Ustroistvo dlya manipulirovaniya zaryazhennymi chastitsami. Patent RF no. RU 2465679C1. [Patent for apparatus for manipulating charged particles]. Prioritet 05.05.2011. URL: https://patents.google.com/patent/RU113611U1/ru (In Russ.).
  41. Berdnikov A.S., Andreeva A.D. Ustroistvo dlya manipulirovaniya zaryazhennymi chastitsami. Patent RF no. RU 2465679C1. [Patent for apparatus for manipulating charged particles]. Prioritet 27.10.2012. URL: https://patents.google.com/patent/RU2465679C1/ru (In Russ.).
 

A. I. Ivanov1, 2, P. V. Bugrov1, N. V. Konenkov1

LINEAR ION TRAP WITH AN ISLAND OF STABILITY
FORMED BY QUADRUPOLE EXCITATION

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 38—44
EDN: OYZYMT
 

The conditions of mass-selective ion ejection at the boundary of the island of stability formed by a quadrupole additional voltage with a frequency of ω = Ω / 2 are considered. Within the island, the parameters βx and βy are found, which determine the spectrum of ion oscillations along the transverse coordinates X and Y of the quadrupole mass filter. An excitation contour near the stability boundary qb = 0.9082 with a relative width of qb / Δq ≈ 3000 is presented.
 

Keywords: quadrupole mass filter, quadrupole excitation, island of stability, linear ion trap, excitation contour

Author affiliations:

1Ryazan State University named for S.A. Yesenin, Ryazan, Russia
2Ryazan State Medical University named after acad. I.P. Pavlov, Ryazan, Russia

 
Contacts: Konenkov Nikolai Vitalievich, n.konenkov@rsu-rzn.ru
Article received by the editorial office on 27.06.2025

Full text (In Russ./In Eng.) >>

REFERENCES

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S. V. Biryukov

FUNDAMENTALS OF INTERACTION BETWEEN A UNIFORM FIELD AND A SINGLE-COMPONENT SPHERICAL ELECTRIC FIELD STRENGTH SENSOR WITH AN OPEN SYSTEM OF ELECTRODES

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 45—55
EDN: CTVHGU
 

The paper considers the fundamentals of theoretical provisions necessary for constructing electroinductive sensors of electric field strength. The sensitive elements of the gauge are spherical shells in the form of spherical segments located on the surface of a virtual sphere. The relevance of such developments is associated with ensuring labor protection and safety for the maintenance personnel of high-voltage power plants. The theoretical provisions are based on solving paired integral equations by numerical methods. Based on the results of numerical solutions, empirical expressions are established for electric charges, open-circuit voltage, and capacitance between sensitive electrodes depending on the angular dimensions of the spherical segments. A design solution for a sensor is proposed, which is based on two diametrically opposed conductive sensitive electrodes in the form of spherical segments located in a medium: the permittivities of the media outside and inside the spherical shells are, respectively, equal to ε1 and ε2. It is established that the most acceptable output signal of such a sensor is the open-circuit voltage. The obtained results of the work allow for an estimated calculation of similar electric field strength sensors.
 

Keywords: electric field, field strength, spherical sensor, spherical shells, spherical segment, open electrode system, measuring circuit

Author affiliations:

Omsk State Technical University, Omsk, Russia

 
Contacts: Biryukov Sergey Vladimirovich, sbiryukov154@mail.ru
Article received by the editorial office on 08.07.2025

Full text (In Russ./In Eng.) >>

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I. V. Kurnin

SIMULATION OF OPERATION OF A GRIDLESS ION GATE
FOR AN ION MOBILITY SPECTROMETER

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 56—63
EDN: FILXCG
 

The results of simulating the creation of an ion packet at atmospheric pressure using a gridless two-electrode ion gate – which is simple to fabricate and readily adaptable to an ion drift spectrometer – are presented in this study. If a second gate is installed in the drift chamber at the proper opening time in relation to the first gate, it improves the separation of partially overlapping peaks in the spectrum, demonstrating that a gridless two-electrode ion gate can be used most effectively in the mode of double sequential ion separation.
 

Keywords: ion gate, ion mobility, resolution of ion mobility spectrometer

Author affiliations:

Institute for Analytical Instrumentation of RAS, Saint Petersburg, Russia

 
Contacts: Kurnin Igor' Vasil'evich, igor.kurnin@gmail.com
Article received by the editorial office on 18.06.2025

Full text (In Russ./In Eng.) >>

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Ya. A. Fofanov, V. V. Manoilov

COMPARATIVE ANALYSIS OF THE POSSIBILITIES OF POLYNOMIAL
AND ANALYTICAL APPROXIMATIONS OF POLARIZATION-
OPTICAL RESPONSES OF MAGNETIC NANOFLUIDS

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 64—72
EDN: WFWIQH
 

A quantitative comparison of the possibilities of polynomial and analytical approximation of weak polarization-optical responses of dilute magnetic nanofluids (NF) is carried out. Estimates of the coefficients of determination are used as criteria for comparing different approximation methods. It is shown quantitatively that for all studied values of the magnetic field, the dependences of the values of weak polarization-optical responses of magnetic NF on concentration are similar in the concentration range of more than three orders of magnitude. The possibilities of using the approximation coefficients for estimating the parameters of the NF under study are considered. The considered methods for approximating experimental data of NF polarization-optical responses are equivalent, since the coefficients of determination for these methods are close to each other. The advantage of the approximation method using an analytical function is that one of the approximation coefficients is directly related to the concentration of the analyzed NF. As a result, there is no need to use calibration curves and perform interpolation in order to estimate the concentration, in contrast to approximation with polynomials. Analytical approximation of the responses of the studied NF by means of dependencies using hyperbolic functions is more sensitive to the outliers in the experimental data than the approximation method based on polynomials. If a polynomial response model is used, the method of estimating concentrations through calibration curves can be successfully applied even when there are noticeable outliers in the experimental data.
 

Keywords: quantitative polarization-optical analysis, magnetic nanofluids, approximation of experimental data

Author affiliations:

Institute for Analytical Instrumentation, RAS, St. Petersburg, Russia

 
Contacts: Manoilov Vladimir Vladimirovich, manoilov_vv@mail.ru
Article received by the editorial office on 20.06.2025

Full text (In Russ./In Eng.) >>

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M. G. Biryukov1, P. E. Afonin1, S. A. Shchurenkova1, D. Y. Pugachev1,
A. F. Tsatsulnikov2, A. V. Sakharov2, E. E. Zavarin2, 3, W. V. Lundin3, D. S. Bazarevskiy4

EQUIPMENT FOR MOCVD EPITAXY OF GALLIUM NITRIDE
ON SILICON SUBSTRATES UP TO 200 MM IN DIAMETER
FOR THE PRODUCTION OF TRANSISTOR HETEROSTRUCTURES

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 73—81
EDN: HXJRME
 

The advantages of using III-N GaN heterostructures on silicon substrates are considered. The general design, methods for optimizing the deposition process and key characteristics of the developed equipment for metalorganic chemical vapour deposition (MOCVD) for the implementation of basic technological processes on silicon substrates with a diameter of up to 200 mm for the production of transistor heterostructures are presented. The results of the implemented basic technological processes are shown.
 

Keywords: MOCVD system, transistor heterostructure, gallium nitride on silicon, modeling, basic technological processes

Author affiliations:

1JSC NIITM, Zelenograd, Moscow, Russia
2STC of Microelectronics RAS, St. Petersburg, Russia
3Monolum Ltd., St. Petersburg, Russia
4Soft-Impact Ltd., St. Petersburg, Russia

 
Contacts: Pugachev Dmitriy Yur'evich, dpugachev@niitm.ru
Article received by the editorial office on 06.06.2025

Full text (In Russ./In Eng.) >>

REFERENCES

  1. Bondar D. [Gallium nitride - a premier among new materials for semiconductor microelectronics]. Komponenty i tekhnologii [Components and technologies], 2018, no. 4, pp. 134—137.
    URL: https://kit-e.ru/nitrid-galliya/ (In Russ.).
  2. Guminov N.V., Myo M.T., Romanjuk V.A., Shomakhmadov D.P. [Comparison of GAAS and GAN hemt-characteristics]. Izvestiya vuzov. Ehlektronika [Proceedings of universities. Electronics], 2019, vol. 24, no. 1, pp. 42—50. (In Russ.). URL: https://www.elibrary.ru/item.asp?id=36948530
  3. Padwal P. Global GaN Semiconductor Devices Market Size & Share Report 2030. 2024. URL: https://www.researchgate.net/publication/379543309_Global_GaN_Semiconductor_Devices_ Market_Size_Share_Report_2030
  4. Akchurin R.Kh., Marmalyuk A.A. MOS-gidridnaya ehpitaksiya v tekhnologii materialov fotoniki i ehlektroniki [MOCVD Epitaxy in Photonics and Electronics Materials Technology]. Moscow, TEKHNOSFERA Publ, 2018. 488 p. (In Russ.).
  5. Lundin W.V., Zavarin E.E., Sakharov A.V., Tsatsulnikov A.F., Ustinov V.M. [III-N movpe reactors: present and future]. Nauchnoe Priborostroenie [Scientific Instrumentation], 2017, vol. 27, no. 1, pp. 5—9. DOI: 10.18358/np-27-1-i59 (In Russ.).
  6. Velikovsky L.E., Sim P.E., Demchenko O.I. et al. [Technology of microwave transistors based on InAlN/GaN and AlGaN/GaN heterostructures]. Vserossiiskaya nauchno-tekhnicheskaya konferentsiya
    "Ehlektronika i mikroehlektronika SVCH"     [Proc. VIII All-Russ. Sci-Tech. Conf.: "Microwave electronics and microelectronics"], 2019, pp. 625—628. URL: https://mwelectronics.etu.ru/assets/files/2019/1/06_09.pdf (In Russ.).
  7.   Fedotov S.D., Zavarin E.E., Sakharov A.V., Tsatsulnikov A.F., Sokolov E.M., Statsenko V.N. [GA(AL)N heterostructures on 6-inch ultra-high resistivity silicon epiwafers for microwave and power electronics]. Nanoindustriya [Nanoindustry], 2024, vol. 17, no. S10-1(128), pp. 150—154. URL: https://www.elibrary.ru/item.asp?id=68016112 (In Russ.).
  8. Su J., Armour E., Lee S.M., Arif R., Papasouliotis G.D. Uniform growth of III-nitrides on 200 mm silicon substrates using a single wafer rotating disk MOCVD reactor. Phys. Status Solidi (a), 2016, vol. 213, no. 4, pp. 856—860. DOI: 10.1002/pssa.201532708
  9. Buntov E. [Heterostructures based on gallium nitride (GaN) and OMMIC technologies based on them]. SVCH ehlektronika [Microwave electronics], 2017, no. 3, pp. 48—51. URL: https://microwave-e.ru/materials/geterostruktury-na-osnove-gan/ (In Russ.).
  10. Irvine S., Capper P., editors. Metalorganic Vapor Phase Epitaxy (MOVPE): Growth, Materials Properties, and Applications. E—book. Wiley Series in Materials for Electronic & Optoelectronic Applications, 2019. 584 p. DOI: 10.1002/9781119313021
  11. Di Paolo E. M., editor. SiC Technology: Materials, Manufacturing, Devices and Design for Power Conversion. Springer, 2024. 320 p. DOI: 10.1007/978-3-031-63418-5
 

E. N. Rakutko1, S. A. Rakutko1, G. V. Medvedev2, S. V. Gulin2

DEVELOPMENT AND LABORATORY TESTING
OF A LED PHYTO-IRRADIATOR

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 82—94
EDN: BIRFGE
 

The issue of energy saving in optical electrotechnologies is important for modern LED-based phyto-irradiators, which have now definitely found their niche in indoor plant lighting. Such devices have several specific features that need to be considered when designing and analysing them. The phyto-irradiator developed is primarily intended for experimental studies on the energy and environmental aspects of indoor plant lighting. It may be also used in the private sector and in small greenhouses for the irradiation of both seedlings and long-stemmed plants. The aim of the study was to design a simple device that could regulate the radiation spectrum accurately enough for practical applications and that could be switched on automatically according to the time of day and the level of natural light. The phyto-irradiator uses a new design principle. Multi-spectral LEDs are evenly distributed over the heat-dissipating surface and combined into separate electrical groups that are switched to achieve the required light quality of the radiation flux. Experimental data was obtained by measuring spectral, photometric, electrical and thermal characteristics of the device. The results confirmed the effectiveness of the developed phyto-irradiator. It combines the accuracy of light quality control with energy efficiency.
 

Keywords: indoor plant lighting, energy saving, phyto-irradiator, LED, energy consumption

Author affiliations:

1Institute for Engineering and Environmental Problems in Agricultural Production (IEEP) —
branch of Federal Scientific Agroengineering Center VIM, Saint Petersburg, Russia
2Saint Petersburg State Agrarian University, Saint Petersburg, Russia

 
Contacts: Rakutko Sergei Anatolievich, sergej1964@yandex.ru
Article received by the editorial office on 12.05.2025

Full text (In Russ./In Eng.) >>

REFERENCES

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L. A. Altynbaev1, P. S. Pleshakov1, N. A. Filatov1, A. S. Bukatin1, 2

MICROFLUIDIC ORGAN-ON-A-CHIP DEVICE WITH POROUS
MEMBRANE FOR LONG-TERM CELL CULTIVATION

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 95—106
EDN: FOBLZP
 

Currently, microfluidic organ-on-a-chip devices are considered as an alternative for drug testing in preclinical studies. They can simulate the structure and functions of individual human organs and organ systems, such as lungs, liver, kidneys, intestines, etc. for screening various substances. One of the key elements of organ-on-a-chip devices is a flexible porous membrane. Cell growth on such membranes allows studying the cellular response to mechanical and chemical stimuli. In this research, we developed a method for fabricating microfluidic organ-on-a-chip devices containing a flexible suspended porous membrane made of polydimethylsiloxane (PDMS) with the addition of multi-walled carbon nanotubes, which increase the mechanical strength of the membrane and do not affect its optical properties. The use of carbon nanotubes made it possible to increase the surface area of the obtained membranes and reduce their rupture during production. For cell growth in the organ-on-a-chip devices, a passive change of the nutrient medium was used. It was based on periodic changes in the tilt angle of the device located on an oscillating platform. This approach allowed growing cells of model cell lines for more than 7 days with a viability of more than 95%. The results obtained indicate good biocompatibility of the used material and its applicability for the fabrication of flexible porous membranes in organ-on-a-chip devices.
 

Keywords: microfluidics, microfluidic device, microfluidic chip, organ-on-a-chip, tissue engineering, drug testing, polydimethylsiloxane, porous membrane

Author affiliations:

1Alferov University, St. Petersburg, Russia
Institute for Analytical Instrumentation of RAS, Saint Petersburg, Russia

 
Contacts: Bukatin Anton Sergeevich, antbuk.fiztek@gmail.com
Article received by the editorial office on 12.05.2025

Full text (In Russ./In Eng.) >>

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N. A. Filatov1, D. V. Pankratov1, A. A. Tiushkevich1, P. S. Pleshakov1, A. S. Bukatin1, 2

PROTECTIVE FILTERS AGAINST DUST AND DIRT PARTICLES
FOR DROPLET MICROFLUIDICS APPLICATIONS

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 107—118
EDN: LTVQNP
 

Currently, droplet microfluidics technologies are actively studied and implemented to solve various biological problems: screening of new drugs, molecular diagnostics, chemical synthesis, etc. However, most of the proposed devices are suitable only for laboratory use due to problems with reliability and reproducibility of results. One of the key problems arising when using microfluidic chips is clogging and blocking of microchannels with dust and dirt particles. Various designs of filter elements placed near the input interfaces of the microfluidic chip are proposed in the literature. However, many of them are not suitable for working with microdroplets of aqueous emulsions, since the filter structure can lead to disruptions of the original emulsion (separation or merging of droplets). In this paper, we studied 17 filter designs integrated into microfluidic chips that retain dust microparticles and pass water-in-oil emulsion microdroplets through themselves. The study determined the efficiency of filtration of microparticles from a model solution of dust in water and fluorocarbon oil. The overall range of dust microparticle filtration efficiency was within 88—99% for all the studied filter designs. The best 4 designs with a filtration efficiency of over 98% were used to study the transport of water-in-oil emulsion microdroplets. Based on the study results, the optimal design of the filter element was determined that retains dust microparticles with an efficiency of 99% and increases the variation coefficient of the diameter of monodisperse water-in-oil emulsion microdroplets by no more than 2 times from 6% to 12%.
 

Keywords: microfluidic chip; PDMS glass chips; filters; merging of droplets; separating of droplets

Author affiliations:

1Alferov Saint Petersburg National Research Academic University of the RAS, Saint Petersburg, Russia
2Institute for Analytical Instrumentation of RAS, Saint Petersburg, Russia

 
Contacts: Filatov Nikita Alekseevich, nikita.filatov@inbox.ru
Article received by the editorial office on 12.05.2025

Full text (In Russ./In Eng.) >>

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A. A. Gavrishev1, D. L. Osipov2

APPLICATION OF NONLINEAR DYNAMICS METHODS
FOR ANALYZING THE PROPERTIES OF SIGNALS FORMED
ON THE BASIS OF TERNARY SEQUENCES

"Nauchnoe Priborostroenie", 2025, vol. 35, no. 3, pp. 119—128
EDN: TLJTPG
 

It is shown that complex signals based on pseudorandom sequences (PRS) are currently being actively used in various fields of activity. It is indicated that many well-known binary PRS, for example, Barker codes, m-sequences, etc., have various disadvantages that make it difficult to use them in practice. Therefore, it seems reasonable to explore ways to complicate the structure of a signal not by increasing the number of characters in its period, but by increasing the number of values that a numeric sequence can take. One of the most obvious and least computationally expensive approaches to complicate the signal structure is the use of ternary sequences (TS). It is noted that, despite the availability of a large number of works on this topic, some issues are not fully disclosed, for example, the secrecy and reliability of such signals when used in data transmission systems. It is proposed to use nonlinear dynamics methods (BDS-statistics, Hurst exponent, peak factor) to evaluate the secrecy and reliability of signals generated on the basis of TS. Based on the conducted research, it has been confirmed that signals generated on the basis of TS are detected using nonlinear dynamics methods, in particular, using BDS-statistics. At the same time, using the Hurst exponent, such signals are not detected, since they are classified as close to white noise. It is noted that all signals generated on the basis of TS have a good peak factor. It is noted that most of the studied signals formed on the basis of TS are close to the signals formed on the basis of classical binary PRS. Based on this, they can be recommended for use in hidden data transmission systems — although they can be detected, however, disclosure of their structure will present certain difficulties, since they have the characteristics of classical binary PRS.
 

Keywords: ternary sequences, data transmission systems, secrecy, reliability, nonlinear dynamics

Author affiliations:

1MSLU, Moscow, Russia
2NCFU, Stavropol, Russia

 
Contacts: Gavrishev Aleksej Andreevich, alexxx.2008@inbox.ru
Article received by the editorial office on 19.05.2025

Full text (In Russ./In Eng.) >>

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