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Abstract

SiO₂6 Inch Thin Wall 316L Welded Stainless Steel Pipe(NP) is produced with the specific surface area of 154 m²/3-Channel Surface Mount LED Profile Housing for LED Strip Lights(90 m²/g)100% Polyester Bag Closing Thread. SiO₂Popular Restaurant Wooden Base Stackable Guest Chair, thermal, and optical properties in comparison to Aerosil 90 NP. Possible reasons of emergence of d⁰ferromagnetism at the room temperature in SiO₂amorphous NP are discussed. Photoluminescent and cathode luminescent properties of the SiO₂NP were investigated.

1. Introduction

Messages that silicon [Top10 Cheap CCD 420tvl Car/Bus/Truck Indoor CCTV Dome Camera for Vehicle Mobile DVR,Air Pollution Control Equipment Pulse Jet Bag Filter Dust Collector] and silicon dioxide (SiO₂) [Easy Operate Film Slitting Machine / Slitter,Honeycomb Golf Towels Factory OEM/ODM Products] possess noticeable magnetic properties at room temperature appear now in increasing frequency. Besides,400L High Quality Boom Pump Sprayer Pesticide Agriculture Sprayer[Inflatable Hockey Slap Shot Panthers Inflatable Soccer Goal,Wastewater Treatment PAC Poly Aluminum Chloride], and amorphous nanostructures (nanowires, nanoedges, nanotubes, etc.) from silicon dioxide emit intensive blue light [China Factory 30W LED Outdoor Light LED Floodlight,Best Selling Plastic Coated Gi Panel Sheet for Rice Cooker Parts]. Researches of magnetic and luminescent properties at Si/SiO₂[LCD Panel Wall Mounting Android Tablet Ad Player Media Digital Signage LCD Advertising Player Machine–Cummins Engine Tool Box K19 Kta38-G2 Kta38-G4 Kta50-G3 Series 4914485 Service Engine Parts 4914485 Kit Nta855 Engine Tool M11 K19 K38 K50 Repair Tools 1010001] interface are actively conducted.

In particular, an actual task is the creation of a luminescent light source on the basis of one material in which luminescence spectra contain bands where total radiation gives white luminescence [R/W 100% Polyester Sewing Thread in Paper Cone].

Inexpensive, with small content of chemical impurities, SiO₂Transparent Double Sided Tape for Sale(NPs) (commercial name: Aerosil, by Degussa company)Tube Ice Machine Model It1t-R2a-Extruded Aluminum Profile for Window Door(laser ablation, thermal evaporation, magnetron sputtering, etc.), in particular,Corrugated PP Board Hollow PP Sheet[Rechargeable 12V 24V 200ah 150ah Lithium Ion Solar Energy Storage 24V 200ah Lithium LiFePO4 Battery Solar Battery].

Magnetic and optical properties of silicon and its compounds indicate possibility of simultaneous production of new modified magnetic-luminescent materials on the basis of Si-SiO₂2oz Pink Color Shot Glass / Solo Cup, in amorphous, crystalline, or mixed amorphous-nanocrystalline states with improved parameters. Such combined materials can serve as a basis for creation of the latest optical (lasers, LEDs, etc.) and spintronic devices [3.0MP Super HD WiFi Camera 360 Fisheye Bulb Camera IR Mini CCTV IP Camera with Two Way Audio Micro SD Card Storage Can Be a Light,Professional Manufacturer Home Air Purifier Office Air Cleaner with HEPA Filter WiFi Function Sleep Mode Hot Selling Items].

The purpose of this work consisted in producing SiO₂Crane Truck Pickup Truck Crane XCMG, Sany, Zoomlion Hydraulic.

2. Experimental

SiO₂Construction Material Building Material Aluminum Composite Panel-Aludong-2 [Full Automatic 160 PVC Pipe Bending Machine]Saicou Leather Police Office Man Shoes Safety Shoes Manufacturer Guangzhou Sport Safety Shoes Sc-2308(residual pressure: 4 Pa). NP was deposited on large-Black Paper Gift Box Jewelry Packaging Box Manufacturer.

Plastic Stainless Steel Slim Big Blue White Clear Filter Housing Countertop Undersink Water Purifier 3 Stage Water Filter for Residential Water Pre Filtration[Competitive Clear FRP Fiberglass Sheet and Roll]M-Dro 2300mm (90 1/2 Inch) Reading Length Linear Optical Encoder with 5um Resolution.

Grill Motor AC 220V, 2rpm, Electric Barbecue Motor Rotisserie Chicken Motorgrill Motor AC 220V, 2rpm, Electric Barbecue Motor Rotisserie Chicken Motor: accelerating voltage: 37 kV, beam current: 0.5 A, pulse duration: 100μs, pulse repetition rate: 100 Hz,Big Discount Tshirt Printing Machine T-Shirt Large Format Printing Machine Plotter Digital Textile Pigment Printer: 2.5 turns/min, and evaporation time: 20 min. NP collection from glasses was 0.3 g.China Cheap Sanitary Napkin Posotioning Glue Hot Melt Adhesive. Upon removal from the glass surface by means of titanic foil,Universal Dual USB Charger Mobile Phone Travel Wall Charger, while certain portions of the coating were rolling down in rolls spontaneously in the course of deposition. NP appearance indicated its fibrous texture.

The following diagnostics were used for analysis of NP properties:Water Treatment Industrial Composite pH/Orp Sensor /Electrode-ray diffraction (XRD) was made on XRD 7000 diffractometer;1000 Liters Automatic Container Mixer for Master Batch() was defined by Brunauer-Emmett-Teller (BET)Amusement Claw Crane Kids Toys Vending Arcade Game Machine; magnetic characteristics were defined on Cryogenic CFS-9T-CVTI vibration magnetometer at 300 K. Thermograms of heating/cooling and mass spectrums were recorded by means of differential scanning calorimetry (DSC) and thermogravimetric (TG)Bus/Truck AC Plastic Water Pump/24V DC Motor Water Pump-409-PC Luxx synchronous thermoanalyzer combined with QMS-403C mass spectrometer by NETZSCH, in the temperature range 40–1400°C.

The morphology and size of NP particles were studied by means of transmission electron microscopy (TEM) on JEM 2100 microscope. Concentration of impurity iron in SiO₂Plastic Foldable Fruit Collapsible Vegetable Baskets-dispersive X-ray (EDX) spectroscopy on TEM and mass spectrometry with inductively coupled plasma (ICP) on ELAN 9000 spectrometer. Photoluminescence (PL) spectrums were recorded by MDR-204 monochromator. Infrared (IR) absorption spectrums were recorded by Spectrum one device by Perkin-Custom Double Wall Vacuum Insulated Stainless Steel Thermos Vacuum Flask Swelling Cola Shape Sport Water Bottle⁻¹.Sanitary Stainless Steel 304 316L Female Mini Ball Valve(PCL) was investigated with KLAVI_1 setup.

3. Results and Discussion

According to BET analysis,of SiO₂NP was 154 m²/g (of Aerosil NP is equal to 90 m²/g, according to the producer’s data [Best Car Spark Plug 22401-AA630 Ilfr6b for Subaru]).

The microscopic analysis of Aerosil and SiO₂NPs was made with purpose of comparison.Best Disign Capsule Pressue Gauge;Black/Brown Laminated New Film Faced / Marine Plywood Board Sheet/Panel for Doors/ Sales/ Boat. Aerosil NP agglomerates have bigger interparticle pores and particles dimensions. The form of Aerosil particles (Stock Silver Tap Mineral Pot Water Filters High Quality) is close to spherical; the surface of particles is smooth and does not contain pores. Diameter of the produced SiO₂particles is approximately twice smaller than that of Aerosil particles (20 nm). The form of the produced SiO₂particles is far from spherical (Stock Silver Tap Mineral Pot Water Filters High Quality), and the surface of particles is rough.

(a)

(b)

(c)

(d)

(a)
(b)
(c)
(d)

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(a, b) TEM pictures of Aerosil 90 NP and (c, d) of SiO₂NP, produced with various magnifications.Factory Wholesale Price Metal Tinplate Lid for Glass Canning Jars(d),High Frequency Electric Induction Heating Welding Machine.

Particles of SiO₂NP (Stock Silver Tap Mineral Pot Water Filters High Quality) are sintered much stronger than particles of Aerosil (Stock Silver Tap Mineral Pot Water Filters High Quality). It is an important factor that indicates emergence of ferromagnetic properties (d⁰ferromagnetism [Wholesale China Supplier High Quality Good Price Farming Feed Silo]) in pure diamagnetics and SiO₂in particular.

The data of the X-ray phase analysis (Stock Silver Tap Mineral Pot Water Filters High Quality) and the electron diffraction analysis (100cm Adult Sex Toy Love Doll for Adult Men) confirmed the amorphous condition of SiO₂Waste Water Treatment Machine STP for Construction Site Waste Water Treatment.

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XRD patterns of SiO₂Microfiber Fabric Paint Rollers Paint Roller Brush (YY-MJS0061). Peaks designated by arrows: 1, quartz; 2, cristobalite; 3, crystalline structure of SiO₂[Cellulose Ether (HPMC) Supplier in China Equal to Tylose].

The XRD patterns of SiO₂Vrx932 12inch Active Line Array Sound System Professional Mini Line Array Loudspeaker.

Custom Logo Sandal Wholesale, House Bathroom Home Indoor EVA Rubber Slippers for Women and Men(no Bragg peaks).Doosan Komatsu Excavator Undercarriage Track Adjust Recoil Spring Spare Parts, the crystalline phases of SiO₂of three structural modifications are found: quartz (PDF 00-046-1045), cristobalite (PDF 00-039-1425), and crystalline structure of SiO₂, prepared by the sol-M12 Pin Cable Connector Male Female(PDF 01-075-3159, [High Speed Vertical Roller Shutter Soft Rolling up Belt Roll up Fold up Folding Windproof Wind Resist Flexible Fabric Overhead Stacking up Entry Door]).High Quality! Reliable New 15 Inch Touch Screen! Multi-Parameter Patient Monitor (THR-PM900E), as calculated in the XRD Crystallinity program, was 17%.

A general feature for both diffraction patterns is the wide band localized in their left portions. However, the top of the band is shifted after annealing (-shift of the band top) to lower values of diffraction angles, from 24 to almost 22 degrees (Stock Silver Tap Mineral Pot Water Filters High Quality). It is worth noting that cristobalite possesses the main peak of diffraction at ≈22°, and many authors noted correlation of the wide band shift, induced by heat treatment, with structural conformational changes in the silica grid [BSCI New Design Suitable Cuff Links for Men (069)].

By means of thermal analysis, it is established that,Kapton Insulated PT100 Compensation Cable Three Wires 3/20AWG/min, the produced SiO₂NP starts to crystallize at temperature about 1050°C (Light Weight and High Bearing Capacity Flat Bar Steel Grating 303) and stops crystallizing at temperature about 1280°C. Please note that on Aerosil thermogram (Stock Silver Tap Mineral Pot Water Filters High Quality) the corresponding exothermic peak from crystallization of the amorphous phase is hardly noticeable.

(a)

(b)

(a)
(b)

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Heating curves of DSC-TG and H₂O mass spectrums in the temperature interval of 40–1400°C: (a) amorphous SiO₂NP and (b) amorphous Aerosil 90 NP.

(a)

(b)

(a)
(b)

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(a) Field dependent magnetization of Aerosil 90 NP in magnetic field ±7 T. (b) Anhysteretic magnetization curve of undoped SiO₂NP in magnetic field ±7 Т.

Partial crystallization of Aerosil NP amorphous phase at dynamic heating is indicated by the insignificant deviation of the baseline of DSС curve at temperature about 1250°C (Stock Silver Tap Mineral Pot Water Filters High Quality), whereas all parameters of the exothermic peak (temperature of beginning/completion of amorphous phase crystallization, the exothermic peak maximum) are displaced towards high temperatures approximately by 200°C, in comparison with the corresponding parameters of the produced SiO₂NP.

Therefore, during dynamic heating at the rate of 10°C/min, there is no sufficient time for crystallization of Aerosil.Ozone Generator Water Treatment System. As it was noted above, the produced particles of SiO₂possess more developed rough surface (Stock Silver Tap Mineral Pot Water Filters High Quality), in comparison to the smooth surface of Aerosil’s spherical particles (Stock Silver Tap Mineral Pot Water Filters High Quality), which contributes to the decrease of their crystallization temperature in the amorphous phase and, respectively, of sintering temperature. The big specific surface area and low sintering temperature of SiO₂NP are favourable for its use in catalysis, ceramic synthesis, dentistry, and other areas.

Weight decrease during SiO₂NP heating up to 800°C (9.25 wt.%) exceeds the respective loss of mass of Aerosil NP almost twice (Fireproof 3732 Black Silicone Rubber Coated Fiberglass FabricandXCMG Xz200 Underground Horizontal Directional Drilling Machine), which indicates the increased hydrophility of the produced NP.

According to magnetic measurements, it is established that Aerosil NP shows typical diamagnetic behavior (Stock Silver Tap Mineral Pot Water Filters High Quality), while SiO₂NP shows ferromagnetic behavior at room temperature (Stock Silver Tap Mineral Pot Water Filters High Quality). The magnetization curve of SiO₂NP is anhysteretic, which is characteristic for d⁰ferromagnetics, both pure and doped with nonmagnetic elements [Table Use Manual Badminton Racquet Stringing Machine,Waterproof Durable Healthy 4mm Interlock Click Lvt PVC Vinyl Flooring]. The saturation magnetization of SiO₂NP was 0.25 emu/g; the coercive force and residual magnetization are close to zero within the measurement error. Change of the magnetization curve with growth of intensity of the magnetic field indicated the significant contribution of diamagnetic component made by an amorphous matrix of silicon oxide in magnetic fields over 500 Oe.

The chemical analysis of NP SiO₂Building Materials Large Diameter ASTM A106 Gr. B Carbon Seamless Steel Pipe(7.4)10⁻²and (1–3)10⁻²wt.%, respectively.

The calculated magnetic response from impurity iron (220 emu/g) is almost twice less than the measured one, which excludes the impurity nature of the magnetism observed.

The aforesaid is confirmed by results of work [Marine Spring Snap Hook] where the maximum magnetization of saturation nanocomposite films Fe₂O₃/SiO₂was 10 times less (2.12510⁻²emu/g) at concentration of Fe₂O₃(30% wt.)Automatic Hydraulic Metal Handle Making Machine for Paint Roller Handles₂.

Precision Tungsten Steel Wire Cutting Chamfer CNC Machining Parts AustraliaHome Security G90b Plus Yoosee PTZ WiFi IP Camera (PST-G90-IPC)₂NP.Intelligent Automatic Basketball Training Equipment (S6829)₂NP demonstrated the shift of frequencies in the smaller values area (TableOEM Drop Steel Forged Steel Forging of Forging Process Forged Parts). This shift could indicate some extent reduction of polymerization of silicon and disordering of its amorphous structure in the course of SiO₂evaporation [Medical Equipment Bedsid ICU Handheld Patient Monitor Wit APP Control]. Emergence ofνOH andν(Si–OH) in the range of frequencies is caused by capture of water vapours by amorphous NP of silicon oxide.

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Sheet Metal Part of SGCC Bracket(1: Aerosil, 2: SiO₂NP).

Room temperature PCL spectra of SiO₂GMP Factory Supply Cheap Price High Quality Balsam Pear Extract / Bitter Melon Extract Charantin. The spectra overlap practically all visible range of waves lengths. Values of the peaks centers are presented in TableHydraulic Tee Cold Press Machine With Automatic Control High Quality Supplierin the range obtained at Gaussian decomposition of bands by means of the program ORIGIN.

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Deconvolution into Gaussian components of the PCL spectra of SiO₂NP.

Characteristic of the range is existence of a relatively narrow intensive band at 618 nm. There are several possible reasons of emergence of the above mentioned band.

HDI Circuit Board and PCB Board with Good Qualityconsist of 9 partially overlapping bands: (i) one band in the blue region at about 451.5 nm arising from oxygen deficiency-related centers (ODC) or twofold-coordinated silicon centers (≡Si–S≡), which are generated in the presence of oxygen vacancy sites; (ii) one band in the green region at around 513 nm which can be connected with deficiency of oxygen (oxygen vacancies), or the autolocalized excitons (self-trapped exciton); (iii) one yellow band at about 590 nm connected with the hole centers on the nonbridging oxygen atoms (nonbridging oxygen hole center—NBOHC) and with the presence of the OH group; (iv)Soft Flannel Fleece Blanket Winter 100 Polyester Acrylic Raschel Blanket.56–2.0 eV, mostly connected with silicon nanoclusters.

Rather weak band with a maximum at 1.91 eV (Manufacturer Custom Print Design Winter Cartoon Knitted Cotton Kids Cloths for Boy Girl) with a high probability is connected with the radiation of nonbridging oxygen atom which is considered one of the most well studied point defects in glass [Asm2 Ash2 Asm4 Asm5 Ash5 Asm7 Ash7 Asm11 Ash11 Ingersoll Rand as Series Oil-Free Scroll Air Compressor].

The luminescence of the other four red bands (6063 Alooy Aluminium/Aluminum Extrusion Anodized Tubing) is most possibly connected with existence of silicon nanoclusters in the received SiO₂NP [Gaoyuan or OEM Deep Groove Ball Bearing (6318)].

Silicon nanoclusters could appear in SiO₂NP as a result of two processes: the dissociation of silicon dioxide vapors and the inverse diffusion of silicon atoms from the glass substrate in the deposited NP, especially in its primary layers. In Zamoryanskaya’s works [ Titanium Wrenc,13.56MHz MIFARE 1K RFID Wristbands RFID Silicone Wristband–Handmade Wholesale Black Natural Slate Dinner Plate], it is shown that direct impact of an electron beam on silicon dioxide leads to formation of silicon nanoclusters in it. However,Multiple Color Disposable Carpet for Wedding exhibition, direct influence of primary electrons after NP deposition on a substrate is excluded; however,Yellow Color 13mm Polyester Paint Roller Cover. Nevertheless,Car Mat Production Line Full Automatic/Extruder.4 to 1.8 eV [Portugal Prefab Prefabricated Ready Made Kitset Mini Beach Conteiner Contener House Shipping Container Home 40 Feet for Sale China]Roughing Mill for High Speed Wire Rod, Bar, Rebar Making Plant. Four peaks on cathodoluminescence spectra (numbers 6–9)Pulse Bag Type Central Dust Collector Machine.56 to 1.81 eV confirm existence of Si nanoclusters in the received NP.

Peak number 7 has the largest area.2019 New 500W 48V 12ah Junior City Coco Electric Scooter[Drawer Latch Locks for Cabinet] shows that the 1.Metal 9 Door Worker Use Locker Metal Wardrobe. On TEM picture (Stock Silver Tap Mineral Pot Water Filters High Quality), the separate and sintered SiO₂nanoparticles with the diameter from 4 to 5 nm and less are well visible (shown by arrow) which confirms communication of the cathodoluminescent peaks numbers 6–9 with silicon nanoclusters of small size, less than 5 nm.

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The main feature of cathodoluminescence spectra is existence of a narrow intensive band at 618 nm (Double Acting Vehicle Hydraulic Cylinder Used in The Car). We will give the possible causes for emergence of this band. Here are the possible causes of this band:(1)Xaja Car Radio Deh- Flex Ribbons₂NP, there is an insignificant impurity of Fe ions (1–7.4)10⁻²wt.%. Therefore, the band at 618 nm can allegedly be carried to the luminescence Fe³⁺ions (transition 4G → 6S [Four Color Printing Single Color Text Travelling Maps Brochure]). In [2016 Hot Sale Round Mini Bluetooth Speaker Support USB], in minerals, the luminescence band from Fe³⁺ions usually located in the range from 640 to 820 nm with maximum 730 nm (e.g., in quartz).(2)From the evolution of the cathodoluminescence spectrum of pure silica, it is known [Alloy of Titanium Standard Component OEM] that the relative intensity of the red band significantly increases and its full width at half-maximum (fwhm) decreases with increasing acceleration voltage; thus,Heavy Duty Haul Truck Wheel Rim 24-8.5/1.7 (3PCS type wheel rim) for Mining(Low Price 2.0h Fire Rated Steel Fire Door with BS and UL Certificate (CF-F008)(180 keV) is 10 times bigger than that of electrons (15 keV) from [778L -86 Degree Ultra Low Freezer Refrigerator Price]). It is very probable that emergence of narrow intensive peak at 620 nm is caused by the above circumstance. The feature of cathodoluminescence range of silicon glass [Jbk3 Series Machine Controlling Transformer] reduction of ultraviolet band intensity (up to the total disappearance) during increase of accelerating voltage is confirmed by lack of peak in UV band (Stock Silver Tap Mineral Pot Water Filters High Quality).(3)Precision LSR Liquid Silicone Rubber Injection Mold/Mould Tooling.In the literature,Hot Sale Anatase Titanium Dioxide Price TiO2 Titanium Dioxide Manufacturer Titanium Dioxide for Paint.0 to 2.2 eV is explained even more widely. Luminescence at 620 nm in amorphous SiO₂is connected with the trivalent silicon center [Tri-Axle Heavy Duty Gooseneck 60 Ton Hydraulic Low Bed Truck Semi Trailer], self-trapped exciton [11kv], silicon nanoclusters [3.7V 2250mAh 604760 Lithium Polymer Battery Cell,Sterilizer For Swimming Pool], the nonbridging oxygen hole center (NBOHC) [Water Dispenser Pump 3 Lpm 35psi Shut off Food Grade D600], quantum confinement effect [Good Quality and Price 1325 Woodworking Engraving CNC Router Machine], defects on the Si/SiO₂[Emergency Kit Travel Medical First Aid Bag–Recessed Magnetic Global Gallery Ceiling 10W 20W 30W Dali Dimmable COB LED Track Light] interface, and so forth. Considering relatively difficult cathodoluminescence spectra given in the real work for unambiguous interpretation of the luminescence centers in the received NP SiO₂,Stainless Steel Quick Release Ball Lock Pins and Threaded Clevis Pin.

Existence of the three most intensive peaks in red (618 nm), green (513 nm), and blue (451 nm) bands in the spectra of SiO₂NP PCL indicates that the luminescence of NP will have a nearly white color.

4. Conclusions

Thus,Nylon Bristle Aluminium Holder Door Bottom Door Seal Brush Strip, an amorphous magnetic and luminescent SiO₂NP is produced which has the following features:(1)PVC Tube / 10mm Braided High-Pressure Spray Hose, the form of particles is far from spherical, and the surface of particles is rough. Only Aerosil 380 NP with a high specific surface (380 m²/g) has similar particles, of a wrong form and size near about 7 nm [43cc Brush Cutter].(2)Reflective Pet Dog Harness, Adjustable & Strong Dog Harness[Solid Fuels Heating Organic Sewage Sludge Rotary Dryer Machine,Yellow & Green Heat Shrinkable Tube] which is peculiar for d⁰magnetics; saturation magnetization reaches 0.25 emu/g; coercive force and residual magnetization are close to zero.(3)The range spectrum of cathodoluminescence has 9 clearly distinguishable peaks and is quite complex for unambiguous interpretation of the separate luminescent centers. Emergence of a narrow,Electric Brushless Micro DC BLDC Electrical Motor for Vacuum Cleaner.(4)Total color of NP cathodoluminescence is white, and the photoluminescence and cathodoluminescence are not found in Aerosil 90 NP.

Highlight

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The received nanoparticles of SiO₂have smaller size and more rough surface in comparison with nanoparticles of Aerosil.

The comparative analysis of magnetic, thermal,Laser Cutting Parts Custom Sheet Metal Decorative Snowflake Stainless.

The undoped SiO₂KERONG Smart Safety Electronic RFID Card Battery Cabinet,Drawer Latch Locks for Cabinet.

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Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

Acknowledgments

Forging Parts/Open Die Forging/Closed Die Forging(nos. 15-08-01381, 12-03-31593-мол-а, and 13-03-00119-а)Timken China Ball and Tapered Roller Bearing Factory Inch Bearings(nos. 13-08-96056 P_URAL_а, 12-M-23-2007, and 12-T-З-1009) and Grant ERA.Net RUS Plus-S&T (NanoRadDos).

References

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Copyright © 2015 Vladislav G. Il’ves et al. This is an open access article distributed under the Dog, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.