Investigated modes of operation and current characteristics of the device with a dynamic division electrospray flow sprayed liquid and removing the exess of the spray under normal conditions. The existence of three most typical spray patterns: electrospray, field desorption, flow. Demonstrated that the spray mode "field desorption" stability spraying currant and quantity not dependent on the flow of sprayed liquid in the range 50–200 µl/min.

REFERENСES

1. Samokish V.A., Krasnov N.V., Muradymov M.Z. Electrospray ion sourse with a dynamic liquid flow splitter. Rapid Commun. Mass Spectrometry., 2013, no. 27 (8), pp. 904–908. DOI 10.1002/rcm 6524.
2. Dole M., Mack L.L., Hines R.L. et al. Molecular beams of macroions. J. Chem. Physics. 1968, vol. 49, no. 5, pp. 2240–2249.
3. Thermo Scientific. URL: (www.tectronica.com).
4. Shimadzu Corp. URL: (www.Shimadzu.com).
5. Agilent. URL: (www.Agilent.com).

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Institute for Analytical Instrumentation RAS, Saint-Petersburg, RF
Contacts: Krasnov Nikolay Vasilyevich, krasnov@alpha-ms.com

Improvement of design for resonance detection in Mössbauer spectroscopy is proposed. Such improvement not limited with the choice of source-converter pairs and allows us to choose various chemical compounds for resonant converter with a maximum content of resonant isotope. This solution leads to an increase of the spectrum quality, its resolution and significantly reduces analysis time. Experimentally demonstrated the influence of source-converter shift on the form of Mössbauer spectrum.

REFERENСES

1. Belyaev А.А., Irkaev S.M., Panchuck V.V. et al. American Institute of Physics Conference Proceedings, 2008, vol. 1070, pp. 147.

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¹Institute for Analytical Instrumentation of RAS, Saint-Petersburg, RF
²Saint-Petersburg State University,
Contacts: Irkaev Sobir Mulloevich, sobir_irkaev@mail.ru

The current mathematical models of taking into account of influence of geometry factor on signal to background ratio are considered in case of real EDXRF spectrometers. The model of multiple scattering based on electron and photon radiation transport in elements of spectrometer using the Monte Carlo method is proposed. It is shown that taking into account multiple scattering lead to better agreement between experimental and calculated data.

REFERENСES

1. Fernandez J.E., Hubbell J.H., Hanson A.L., Spenser L.V. Polarization effects on multiple scattering gamma transport. Radiation Physics and Chemistry, 1993, vol. 41, no. 4/5, pp. 579–630.

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¹Applied Physics Institute of Irkutsk State University, Irkutsk, RF
²Irkutsk State University of Transport, Irkutsk, RF
Contacts: Gorbunov Michail, romepatrician@rambler.ru

One of the most common polymeric materials used to fabrication the microfluidic chips is polymethylmethacrylate. Although the polymer has the desired physical and chemical properties for many applications in analytical chemistry, medicine, biotechnology, but its hydrophobicity and lack of reactive groups on the surface leads to a modification. The paper presents the results of studies of chemical and physical processing methods to improve the surface wetting and create conditions for the subsequent organization of functional groups.

REFERENСES

1. Alrifaiy A., Lindahl O.A., Ramser K. Polymer-based microfluidic devices for pharmacy, biology and tissue engineering. Polymers, 2012, vol. 4, pp. 1349–1398.
2. Becker H., Gartner C. Polymer microfabrication technologies for microfluidic systems. Analytical and Bio-analytical Chemistry, 2008, vol. 390, no. 1. pp. 89–111.
3. Lee S.-J. J., Sundararajan N. Microfabrication for microfluidics. MA, Norwood, ARTECH House Inc, 2010, 280 p.
4. Ledesma-Aguilar R., Nistal R., Hernandez-Machado A., Pagonabarraga A. Controlled drop emission by wetting properties in driven liquid filaments. Nature Materials, 2011, vol. 10, pp. 367–371.
5. Witters D., Vergauwe N., Vermeir S. et al. Biofunctio-nalization of electrowetting on dielectric digital micro-fluidic chips for miniaturized cell-based applications. Lab Chip, 2011, vol. 11, pp. 2790–2794.
6. Wu D., Zhao B., Dai Z., Qin J., Lin B. Grafting epoxy-modified hydrophilic polymers onto poly (dimethylsi-loxane) microfluidic chip to resist nonspecificprotein adsorption. Lab Chip, 2006, vol. 6, pp. 942–947.
7. Grainger D.W., Greef C.H., Gong P., Lochhead M.J. Current microarray surface chemistries. Methods in Molecular Biology, 2007, vol. 381, pp. 35–57.
8. Carlborg C.F., van der Wijngaart W. Sustained super-hydrophobic friction reduction at high liquid pressures and large flows. Langmuir, 2011, vol. 27, pp. 487–493.
9. Muck A., Svatos A. Chemical modification of polymeric microchip devices. Talanta, 2007, vol. 74, pp. 333–341.
10. Stratakis E., Ranella A., Fotakis C. Biomimetic micro / nanostructured functional surfaces for microfluidic and tissue engineering applications. Biomicrofluidics, 2011, vol. 5, 013411, pp. 31.
11. Kitova S., Minchev M., Danev G. Soft plasma treatment of polymer surfaces. Journal of Optoelectronics and Advanced Materials, 2005, vol. 7, no. 1, pp. 249–252.
12. Brown L., Koerner T., Horton J.H., Oleschuk R.D. Fabrication and characterization of poly (methylmetha-crylate) microfluidic devices bonded using surface modifications and solvents. Lab Chip, 2006, vol. 6, pp. 66–73.
13. Vesel A., Mozetic M. Surface modification and ageing of PMMA polymer by oxygen plasma treatment. Vacuum, 2012, vol. 86, no. 6, pp. 634–637.
14. Chai J., Lu F., Li B., Kwok D. Y. Wettability Interpretation of Oxygen Plasma Modified Poly (methyl methacrylate). Langmuir, 2004, v. 20, no. 25, pp. 10919–10927.
15. Mathur A., Roy S.S., Tweedie M. et al. Characterisation of PMMA microfluidic channels and devices fabricated by hot embossing and sealed by direct bonding. Curr. Appl. Phys., 2009, vol. 9, pp. 1199–1202.
16. Jafari M., Dorranian D. Surface modification of PMMA polymer in the interaction with oxygen-argon RF plasma. Journal of Theoretical and Applied Physics, 2011, v. 5, no. 2, pp. 59–66.
17. Tennico Y.H., Koesdjojo M.T., Kondo S. et al. Surface modification-assisted bonding of polymer-based microfluidic devices. Sensors and Actuators B, 2010, vol. 143, pp. 799–780.
18. Cheng J.-Y., Wei C.-W., Hsu K.-H. Direct-write laser micromachining and universal surface modification of PMMA for device development. Sensors and Actuators B, 2004, vol. 99, no. 1, pp. 186–196.
19. Mathur A., Roy S.S., Tweedie M. et al. Characterisation of PMMA microfluidic channels and devices fabricated by hot embossing and sealed by direct bonding. Curr. Applied Physics, 2009, vol. 9, no. 6, pp. 1199–1202.
20. Yao L., Liu B., Chen T., Liu S., Zuo T. Micro flow-through PCR in a PMMA chip fabricated by KrF excimer laser. Biomed Microdevices, 2005, vol. 7, no. 3, pp. 253–257.
21. Chen Y., Zhang L., Gang C. Fabrication, modification and application of Poly (methyl methacrylate) microfluidic chips. Electrophoresis, 2008, vol. 29, no. 9, pp. 1801–1814.
22. Brown L., Koerner T., Horton J.H., Oleschuk R.D. Fabrication and characterization of poly (methylmetha-crylate) microfluidic devices bonded using surface modifications and solvents. Lab on Chip, 2006, vol. 6, no. 1, pp. 66–73.
23. Israelachvili J.N., Gee M.L. Contact angles on chemically heterogeneous surfaces. Langmuir, 1989, vol. 5, no. 1, pp. 288–289.
24. Peth C., Barkusky F., Mann K. Near-edge x-ray absorption fine structure measurements using a laboratory-scale XUV source. Journal of Physics D: Appl. Physics, 2008, vol. 41, no. 10, 105202.

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¹Institute for Analytical Instrumentation of RAS, Saint-Petersburg
²University ITMO
³Saint-Petersburg Academic University — Nanotechnology Research and Education Center RAS
Contacts: Evstrapov Anatoly Alexandrovich, an_evs@mail.ru

Presented are experimental results of investigation of gas flow velocity influence on the sensitive layer resistance of the resistive semiconductor sensor under condition of heater thermo stabilization and sensor design when heater and sensitive layer are on the opposite sides of the dielectric substrate. It is shown, that change in sensor sensitive layer resistance caused by flow velocity changes under condition of constant heater temperature repeats the character of temperature dependence of sensor sensitive layer resistance in a constant flow. Influence of the observed dependences for the results of the ozone concentration measurements is discussed.

REFERENСES

1. Korotchenko G., Cho B.K. Instability of metal oxide-based conductometric gas sensors and approaches to stability improvement (short survey). Sensors and Actuators B, 2011, vol. 156, pp. 527–538.
2. Giberti A., Benetti M, Carotta M.C. et al. Heat exchange and temperature calculation in thick-film semiconductor gas sensor systems. Sensors and Actuators B, 2008, vol. 130, pp. 277–280.
3. Isaienko O., Maksymovych N., Yatsimirsky V. Determination of the sensitive layer temperature of the adsorption-semiconductor gas sensor. Sensors and Actuators B, 2005, vol. 108, pp. 134–142.
4. Calestani D., Zha M., Mosca R. et al. Growth of ZnO tetrapods for nanostructure-based gas sensors. Sensors and Actuators B, 2010, vol. 144, no. 2, pp. 472–478.
5. Korotcenkov G., Cho B.K. Ozone measuring: What can limit application of SnO2-based conductometric gas sensors? Sensors and Actuators B, 2012, vol. 161, pp. 28–44.

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¹Karpov Institute of Physical Chemistry, Moscow, RF
²Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, RF
Contacts: Obvintseva Ludmila Alexeevna, obvint@yandex.ru

The researches, which have been carried by authors, are concerned with study of single-frequency mode of operation of diode lasers generating at the wavelengths of 635 and 655 nm. In our experiments we have studied spectral characteristics of these lasers (presence of single-longitudinal-mode, inter-mode interval, range of temperature tuning of frequency of laser radiation, measurements of drift of average value of frequency in time).

REFERENСES

1. ThorLabs. URL: (http://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=7).
2. Wieman C.E., Hollberg L. Using diode lasers for atomic physics. Rev. Sci. Instr., 1991, vol. 62, no. 1, pp. 1–20.
3. Fox R.W., Hollberg L., Zibrov A.S. Semiconductor diode laser. Atomic, Molecular, and Optical Physics: Electromagnetic Radiation, Academic Press, San Diego, 1997, vol. 29C, Eds. Dunning F.B. and Hulet R.G. pp. 77–102.
4. DL-100 Series — Tunable Diode Lasers. URL: (http://www.toptica.com/products/research_grade_diode_lasers/tunable_diode_lasers/tunable_diode_lasers_370_nm_1770_nm_dl_100.html).
5. URL: (http://www.nevatec.ru/LR/index.htm).

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Saint-Petersburg Polytechnic University, RF
Contacts: Parfenov Vladimir Alexandrovich, ppparfen@mail.ru; Dvorzov Denic Valerievich, otenki@mail.ru

Linear ion trap excitation contour with round rods is studied by the numerical method in dependence of geometrical parameter γ = r / r₀, where r is the rod radius, r₀ is a radius of the inscribed circular between rod tips. The quadrupole resonance parametric excitation of the ion oscillations by three methods: (a) auxiliary RF voltage, (b) amplitude and (c) frequency (phase) modulation of the applied RF voltage have been studied. It was obtained that irrespective of the above methods the peak shape is symmetrical and has a slow peak tails for ratio r / r₀ = 1.12–1.13 thus the resolution determined at half peak height is the same as for pure quadrupole field.

REFERENСES

1. Dawson P.H. Quadrupole mass spectrometry and its applications. Ed.: P.H. Dawson. Woodbury, AIP Press, 1995, 129 p.
2. Dayton I.E., Shoemaker F.C., Mozley R.F. The measurement of two-dimensional fields. Part II: Study of a quadrupole magnet. Rev. Sci. Instr., 1952, vol. 25, p. 485–490.
3. Denison D.R. Operating parameters of a quadrupole in a grounded cylindrical housing. J. Vac. Sci. Technol., 1971, vol. 8, p. 266–269.
4. Lee-Whiting G.E., Yamazaki L. Semianalytical calculations for circular quadrupoles. Nucl. Instrum. Methods, 1971, vol. 94, p. 319–324.
5. Reuben A.J., Radchik A.V., Smith G.B., Vagov A.V. Exact fields in multi-electrode ion optics. Rapid Commun. Mass Spectrom., 1994, vol. 8, p. 939–941.
6. Reuben A.J., Smith G.B., Moses P. et al. Ion trajectories in exactly determined quadrupole fields. Int. J. Mass Spectrom. Ion. Proc., 1996, vol. 153, p. 43–59.
7. Schulte J., Shevchenko P.V., Radchik A.V. Nonlinear field effects in quadrupole mass filters. Rev. Sci. In-strum., 1999, vol. 70, no. 9, p. 3566–3571.
8. Gibson J.R., Taylor S. Numerical investigation of the effect of electrode size on the behavior of quadrupole mass filters. Rapid Commun. Mass Spectrom., 2001, vol. 15, p. 1960–1964.
9. Douglas D.J., Konenkov N.V. Influence of the 6th and 10th spatial harmonics on the peak shape of a quadrupole mass filter with round rods. Rapid Commun. Mass Spectrom., 2002, vol. 16, p. 1425–1431.
10. Douglas D.J., Konenkov N.V. Mass resolution of linear quadrupole ion traps with round rods. Rapid Commun. Mass Spectrom., 2014, in press.
11. Konenkov N.V., Cousins L.M., Baranov V.I. et al. Quadrupole mass filter operation with auxiliary quadrupole excitation: Theory and experiment. Int. J. Mass Spectrom., 2001, vol. 208, p. 17–27.
12. Konenkov N.V., Douglas D.J., Sudakov M.Yu. Matrix methods for the calculation of the stability diagrams in quadrupole mass spectrometry. J. Am. Soc. Mass Spectrom., 2002, vol. 13, no. 6, p. 597–613.
13. Konenkov N.V., Korolkov A.N., Makhmudov M.N. Upper stability island of the quadrupole mass filter with amplitude modulation of the applied voltages. J. Am. Soc. Mass Spectrom., 2005, vol. 16, p. 379–387.
14. Luo C., Jiang D., Ding C.-F., Konenkov N.V. Mass peak shape improvement of a quadrupole mass filter when operating with a rectangular wave power supply. Rapid Commun. Mass Spectrom., 2009, vol. 23, no. 17, p. 2793–2801.
15. Zhao X., Ryjkov V.L., Schuessler H.A. Parametric excitations of trapped ions in a linear rf ion trap. Physical Review A, 2002, vol. 66, 063414, p. 1–7.
16. Gershman D.J., Block B.P., Rubin M. et al. Higher order parametric excitation modes for spaceborne quadrupole mass spectrometers. Rev. Sci. Instrum., 2011, 125109, p. 1–15.
17. Konenkov A.N., Douglas D.J., Konenkov N.V. Spatial harmonics of linear multipoles with round electrodes. Int. J. Mass Spectrom., 2010, vol. 289, p. 144–149.
18. Douglas D.J., Konenkov N.V. Mass selectivity of dipolar resonant excitation in a linear quadrupole ion trap. Rapid Commun. Mass Spectrom., 2014, vol. 28, p. 430–439.
19. Douglas D.J., Polyakov A. and Konenkov N.V. Quadrupolar ion excitation for radiofrequency-only mass filter operation. Eur. J. Mass Spectrom., 2014, vol. 20, p. 207–214.
20. Konenkov N.V., Londry F., Ding C.-F., Douglas D.J. Linear quadrupoles with added hexapole fields. J. Am. Soc. Mass Spectrom., 2005, vol. 17, p. 1063–1073.
21. Ding C.-F., Konenkov N.V., Douglas D.J. Quadrupole mass filters with octopole fields. Rapid Commun. Mass Spectrom., 2003, vol. 17, p. 2495–2502.
22. Prog. Mathematica. URL: (http://www.wolfram.com).
23. Prog. Simion. URL: (http://www.simion.com).

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¹Ryazan State University, Ryazan, RF
²Institute for Analytical Instrumentation of RAS, Saint-Petersburg, RF
Contacts: Konenkov Nikolay Vital'evich, n.konenkov@rsu.edu.ru

The problem of numerical simulation of the trajectories of charged particles as applied to the pulsed electric fields, is considered. Typical numerical recipes imply that the right hand side function of the differential equations is smooth and can be differentiated up to necessary order; however, when applied to the functions with sharp jumps these recipes can result to serious inaccuracies of the calculations. The paper considers the true inaccuracy artifacts which exists for the pulsed functions (pulsed electric fields) when some "smooth" numerical recipes are used for trajectory integration. It also considers some simple modifications of the standard tracing algorithms which enable to eliminate these artifact effects.

REFERENСES

1. Hawkes P.W., Kasper E. Principles of electron optics. London, 1989.
2. Yavor M.I. Optics of charged particle analyzers. Ser. Advances of Imaging and Electron Physics, Amsterdam, Elsevier, 2009, vol. 157.
3. Kutta M.W. Beitrag zur näherungsweisen integration totaler differentialgleichungen. Zeitschrift für Mathematik und Physik, 1901, vol. 46, рp. 435–453.
4. Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P. Numerical recipes: the art of scientific computing. Third edition. Cambridge University Press, 2007, 1235 р. URL: (http://www.nr.com).

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¹Institute for Analytical Instrumentation of RAS, Saint-Petersburg
²A.F. Ioffe Physico-Technical Institute of RAS, Saint-Petersburg
³Saint-Petersburg State Polytechnical University
Contacts: Berdnikov Alexander Sergeevich, asberd@yandex.ru

Questions of the approximate accounting of multiple dispersion in the conditions of influence of borders of a wave guide are considered. The problem is solved in relation to the spherical radiator which is in a half-space at flat border. Expressions for direct, and also the field once disseminated by a radiator caused by existence of waves reflected from border are presented. The problem is solved in zero approach by means of received before the equipment following from that fact that amplitude of dispersion satisfies to Helmholtz's equation on variables of location of the lens.

REFERENСES

1. Gaunaurd J.C., Huang H. Acoustic scattering by a spherical body a plane boundary. J. Acoust. Soc. Am., 1994, vol. 96, no. 4, pp. 2526–2536.
2. Gaunaurd J.C., Huang H., Strifors H.C. Acoustic scattering by a pair of spheres. J. Acoust. Soc. Am., 1995, vol. 96, no. 1, pp. 495–507.
3. Colton D., Kress R. Inverse acoustic and electromagnetic scattering theory. Springer, 1998. 334 p.

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Institute for Analytical Instrumentation of RAS, Saint-Petersburg, RF
Contacts: Sharfarets Boris Pinkusovich, sharb@mail.ru

In work on the example of the elementary liquid layer with flat borders the general rather simple approximate algorithm of calculation of the field formed by dispersion of primary field radiated by a third-party source on inclusion and dispersion on inclusion of a secondary field after its single reflection from borders of a wave guide is offered. The secondary field is understood as the field of dispersion caused by falling on inclusion of primary field. The task is considered for inclusion in the form of any spherically a symmetric body, however this assumption is easily generalized on any inclusion. The solution of this task was possible thanks to the algorithm of stay of total amplitude of dispersion received earlier by the author when falling on inclusion of a wave of a difficult form. The algorithm can be used in layered and non-uniform wave guides on condition of uniformity of the layer containing inclusion. The problem is easily solved and when the radiator and inclusion are combined.

REFERENСES

1. Hackman R.H., Sammelmann G.S. Acoustic scattering in an inhomogeneous waveguide: Theory. J. Acoust. Soc. Am., 1986, vol. 80, no. 5, pp. 1447–1458.
2. Sammelmann G.S., Hackman R.H. Acoustic scattering in a homogeneous waveguide: Theory. J. Acoust. Soc. Am., 1987, vol. 82, no. 1, pp. 324–336.
3. Hackman R.H., Sammelmann G.S. Multiple-scattering analysis for a target in an oceanic waveguide. J. Acoust. Soc. Am., 1988, vol. 84, no. 5, pp. 1813–1825.
4. Gaunaurd J.C., Huang H. Acoustic scattering by a Spherical body a plane boundary. J. Acoust. Soc. Am., 1994, vol. 96, no. 4, pp. 2526–2536.
5. Gaunaurd J.C., Huang H., Strifors H.C. Acoustic scat-tering by a pair of spheres. J. Acoust. Soc. Am., 1995, vol. 96, no. 1, pp. 495–507.
6. Colton D., Kress R. Inverse acoustic and electromag-netic scattering theory. Springer, 1998, 334 p.

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Institute for Analytical Instrumentation of RAS, Saint-Petersburg, RF
Contacts: Sharfarets Boris Pinkusovich, sharb@mail.ru

The genetic signals simulation for assessment of digital signal processing efficiency was carried out. The possibilities of different methods of baseline correction, filtering and increasing resolution in genetic analyses were considered.

REFERENСES

1. URL: (http://www.iai.rssi.ru/en/catalog.php).
2. URL: (http://matlab.exponenta.ru/ml/book2/chapter8/diff.php).

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Institute for Analytical Instrumentation of RAS, Saint-Petersburg, RF
Contacts: Manoylov Vladimir Vladimirovich, manoilov_vv@mail.ru; Belov Yuriy Vasil'evich, bel3838@mail.ru

Currently Kyropoulos method (GOI) is the most widely applied for industrial production of single sapphire crystals of optoelectronic quality. The method consists in the fact that growth of the crystal is carried out directly in the melt by gradual temperature decrease. Generally, process control is based on reducing the heating power according to a predetermined function of time which is chosen empirically on the grounds of quality of crystals obtained in preceding processes. In recent years, weight sensors have been used to control the process of crystal growing by Kyropoulos method. The main advantage of the crystallization process control using dynamic weighing is the ability to measure continuously and stabilize the crystallization mass rate using a feedback system. However, implementation this system requires the development of high-precision dynamic weighing apparatus, as well as algorithms for automatic feedback control. In this paper we consider the design features and algorithms for automatic control applied for NIKA-M60 crystal growth machine. These features allow realizing automatic control crystallization process with feedback via the heater power and the pulling rate of the crystal.

REFERENСES

1. URL: (http://www.apeks-sapphire.com/Rus/equipment_ru.html).
2. Bardsley W., Green G.W., Holliday C.H., Hurle D.T.J. Automatic control of Czochralski crystal growth. J. of Crystal Growth, 1972, vol. 16, pp. 277–279.
3. URL: (http://www.rsatu.ru/arch/aref_lobacevich_kl.pdf).
4. Singh G., Ghosh B., Deshpande R.Y. On the shape of crystals grown by Kyropoulos technique. Kristall und Technik, 1981, vol. 16, pp. 1239–1245.

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¹Federal State Institution of Science Institute of Solid State Physics, RAS (ISSP), Chernogolovka, RF
²The Federal State Unitary Enterprise Experimental Factory of Scientific Engineering with the Special Design Bureau of the RAS (EZAN), Chernogolovka, RF
Contacts: Francev Dmitry Nikolaevich, far-far@mail.ru

Currently, the major manufacturers of mobile communication devices (smartphones, tablets) started to use sapphire as a protective material for a screen. Strength and high hardness of sapphire significantly improve consumer quality of smartphones, and is just necessary for devices required for a special purpose. The mass use and substitution of traditional chemically toughened glass with sapphire so far limited due to its high cost of production and mechanical processing. Ezan develops and delivers high-performance industrial equipment and technology for production of shaped sapphire crystals. The equipment and technology has advantages it terms of cost and productivity over the well-established techniques used for commercial production of protective screens for mobile devises

REFERENСES

1. URL: (http://lugansk.all.biz/oborudovanie-dlya-vyrashchivaniya-profilnyh-g1551388#.U8URa_l_t8E).
2. URL: (http://omega-crystals.com/ru/product/Spektr_DM-4.html).
3. A durable and scratch-free screen cover material for next-generation mobile and touch screen devices. URL: (www.gtat.com/7a480e6e-3b40.../download.htm).

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¹Federal State Institution of Science Institute of Solid State Physics, RAS (ISSP), Chernogolovka, RF
²The Federal State Unitary Enterprise Experimental Factory of Scientific Engineering with the Special Design Bureau of the RAS (EZAN), Chernogolovka, RF
Contacts: Yudin Mikhail Viktorovich, mikhail-yu@inbox.ru