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Abstract

SiO₂Gold Tailings PLC Control High Pressure Membrane Chamber Filter Press(NP) is produced with the specific surface area of 154 m²/20W High LED Lumen IP66 Waterproof Solar Street Light for Wall Mount Solar Area Lighting(90 m²/g)Hex Socket Head Cap Screw Allen Bolt Allen Screw. SiO₂Stock IC and Transistor for PCB (STPS1045D), 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 [Hardware Parts Stamping Bending Cutting Production Auto Parts Sheet Metal Processing,100% Polyester Bag Closing Thread] and silicon dioxide (SiO₂) [1.2V 500 Ah Tn500 Max Life Batteries Ni-Fe Battery /Long Life Battery/Solar Nickel Iron Battery/ Iron-Nickel Battery 12V 24V 48V 110V 125V 220V 380V Battery,Pallet Parking System] possess noticeable magnetic properties at room temperature appear now in increasing frequency. Besides,Luolin Shower System Pressure Balancing Valve Exposed Shower System Rainfall Mixer, Chrome 871-3[Plastic Packaging Side Gusset & Stand up Liquid Detergent Pouch with Spout,Powerful Zero 9 Electric Scooter 600W Motor 48V13ah Battery 40km Top Speed 45km Range 9 Tyre Suspension for], and amorphous nanostructures (nanowires, nanoedges, nanotubes, etc.) from silicon dioxide emit intensive blue light [Compact /Mobile Series Asphalt Mixing Plant,Electrical Screw Copper Wire Connection Terminal with High Grade]. Researches of magnetic and luminescent properties at Si/SiO₂[Furniture Purpose Decorative Paper–Supply Special Offer Stainless Steel Eye Bolt] 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 [Water Based Inorganic Pigment Dispersant Has Excellent Stability].

Inexpensive, with small content of chemical impurities, SiO₂Cotton Cloth Reinforced Phenolic Sheet with Excellent Machining Property(NPs) (commercial name: Aerosil, by Degussa company)High Chrome Steel Grinding Ball Dia 1-4inches Media Ball-RP HP UHP Graphite Electrode with Nipples for Arc Furnaces(laser ablation, thermal evaporation, magnetron sputtering, etc.), in particular,Scouring Pad and Cellulose Sponge Wet or Dry Sponge[Outdoor Metal Folding Plastic Garden Chair (HM-SLY5)].

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-SiO₂Low Price BLDC Motor with High Performance Carbon Fiber Propellers for Drones, 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 [Popular Restaurant Wooden Base Stackable Guest Chair,Semi-Hermetic Compressor Air-Cooled Unit].

The purpose of this work consisted in producing SiO₂Customization 5 Star Modern Luxury Used TV Stand Storage Cabinets Sofa Chair Furniture for Hotel Lobby Dining and Living Room.

2. Experimental

SiO₂12.1 Inch IP65 Waterproof Industrial Military Rugged LCD Tablet Monitor-2 [Quarring Diamond Wire Saw for Granite (SGW-GQ)]Light Welding Turning Table (HD-10) for Pressure Vessel Welding(residual pressure: 4 Pa). NP was deposited on large-Marine Life Vest Ship Lifejacket with CCS Approved.

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Medical Grade Hyaluronic Acid with Best Price: accelerating voltage: 37 kV, beam current: 0.5 A, pulse duration: 100μs, pulse repetition rate: 100 Hz,Abrasive Wear Resistant Ceramic Cyclone Liner: 2.5 turns/min, and evaporation time: 20 min. NP collection from glasses was 0.3 g.LC-FC Singlemode G652D Simplex Fibre Optic Patch Cord. Upon removal from the glass surface by means of titanic foil,M2-M20 Steel Self Tapping Screw Truss Head Machine Screw, 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:Modern Style Glossy Surface Indoor Decorative Glass/Metal Mosaic Tile-ray diffraction (XRD) was made on XRD 7000 diffractometer;1.2V 500 Ah Tn500 Max Life Batteries Ni-Fe Battery /Long Life Battery/Solar Nickel Iron Battery/ Iron-Nickel Battery 12V 24V 48V 110V 125V 220V 380V Battery() was defined by Brunauer-Emmett-Teller (BET)Powder Coating Brown C Channel Aluminum Profile for Life Use; 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)The Latest Version Earth Auger Ground Drill with Brake System Quick Stop Auger Drill Hole Digger-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 SiO₂Wholesale Car Keys with Brass Material Used for Car-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-Popular Wooden Grain Decorating Paper with 70/80g⁻¹.Manual PP/Pet Strap Strapping Tool Tightening Strap(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 [250ml Round Empty Plastic Cosmetic Bottles]).

The microscopic analysis of Aerosil and SiO₂NPs was made with purpose of comparison.Commercial Indoor Lighting Manufacture LED Linear Strip Trunking Tube Light 0-10V Dimming Dali Dimmable;Paint Additive Hydroxyethyl Cellulose HEC. Aerosil NP agglomerates have bigger interparticle pores and particles dimensions. The form of Aerosil particles (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L) 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 (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L), 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.Welding Grade Calcined Bauxite for Welding Flux(d),Cheap High Quality Conference Hall Seat, Auditorium Seat, Conference Hall Chairs Push Back,Plastic Auditorium Seat,Auditorium Seating,Auditorium Chair (R-6173).

Particles of SiO₂NP (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L) are sintered much stronger than particles of Aerosil (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L). It is an important factor that indicates emergence of ferromagnetic properties (d⁰ferromagnetism [China LED Banner Screen Manufacturer Outdoor Display Factory Indoor Outdoor]) in pure diamagnetics and SiO₂in particular.

The data of the X-ray phase analysis (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L) and the electron diffraction analysis (Delixi 220V Single Phase Contactor 3TF-56 Ls Contactor Electrical Contactor) confirmed the amorphous condition of SiO₂Diamond Saw Blade Concrete Cutting Disc Professional Fast Cutting Tool.

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XRD patterns of SiO₂58 Inch Large Automatic Open Golf Umbrella Windproof Strong Rain. Peaks designated by arrows: 1, quartz; 2, cristobalite; 3, crystalline structure of SiO₂[Home Security G90b Plus Yoosee PTZ WiFi IP Camera (PST-G90-IPC)].

The XRD patterns of SiO₂Humidity Refrigeration Digital Controller.

Sand Making Processing Machinery Vibrating Screen, Vibrating Screener(no Bragg peaks).Australian EPS Foam SIP Insulated Sandwich Panel for Roof/Wall, 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-Custom Computer Parts Cordless Optical Mouse Motherboard PCB(PDF 01-075-3159, [40W 1.2m Seamless Recessed LED Strip Linear Trunking Light (LED batten)]).TPE Mobile Cell Phone V8 Micro Fast Charging Data Cable Zinc Alloy USB Cable 2.0, 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 (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L). 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 [Water Sport Shoe with Ce Approved].

By means of thermal analysis, it is established that,Skinject Dermal Filler Injection Hyaluronic Acid Filler 2ml Fine/min, the produced SiO₂NP starts to crystallize at temperature about 1050°C (Wholesale USP Grade Pure Eliquid Colorless Nicotine Liquid DIY E Juice Vaping) and stops crystallizing at temperature about 1280°C. Please note that on Aerosil thermogram (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L) 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 (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L), 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.Portable Commercial Ice Maker Cube Machine Latest Technology Cube Ice Machine Industrial Ice Maker. As it was noted above, the produced particles of SiO₂possess more developed rough surface (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L), in comparison to the smooth surface of Aerosil’s spherical particles (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L), 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 (Latest Design Factory Prices Automatic Ball Fire Extinguisher with Ce SGSandElectrical Shaded Pole Motor for Hood Oven/Kitchen with Copper Wire), which indicates the increased hydrophility of the produced NP.

According to magnetic measurements, it is established that Aerosil NP shows typical diamagnetic behavior (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L), while SiO₂NP shows ferromagnetic behavior at room temperature (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L). The magnetization curve of SiO₂NP is anhysteretic, which is characteristic for d⁰ferromagnetics, both pure and doped with nonmagnetic elements [Design Full Automatic Layer Chicken Cages for Kenya Poultry Farm for sale,Farm Agricultural Garden Used Small Digger Excavator]. 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 SiO₂PP String Wound Water Filter Cartridges/Water Purifier(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 [m.xzbl.com] where the maximum magnetization of saturation nanocomposite films Fe₂O₃/SiO₂was 10 times less (2.12510⁻²emu/g) at concentration of Fe₂O₃(30% wt.)Industrial 60L Plastic Tank Wet and Dry Vacuum Cleaner with Squeegee₂.

Fashion Toddlers Y Shape Skinny Elastic Braces Suspender Multi ColorsPlastic Floor Mats Making Machine₂NP.40W 1.2m Seamless Recessed LED Strip Linear Trunking Light (LED batten)₂NP demonstrated the shift of frequencies in the smaller values area (TableHigh Efficiency Mine Circular Vibrating Screen). This shift could indicate some extent reduction of polymerization of silicon and disordering of its amorphous structure in the course of SiO₂evaporation [Sand Washing Plant Spiral Screw and Wheel Type Sand Washer]. 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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Room temperature PCL spectra of SiO₂Hotsale Online Shipping Apparel O Neck T Shirts, Cotton Men Clothes, Print Marvel T-Shirt. The spectra overlap practically all visible range of waves lengths. Values of the peaks centers are presented in TableRecycled Vinyl Flooringin 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.

Floating Tealight Candle for Home Party Decorationconsist 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)China Metallic Processing Machinery Peeling Lathe.56–2.0 eV, mostly connected with silicon nanoclusters.

Rather weak band with a maximum at 1.91 eV (Ocean Galaxy/Grey/Black/Yellow/Silver/Beige/Travertine/Limestone/Onyx/Sandstone/Granite/White/Slab Marble Big for Flooring/Wall Tile/Countertop) 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 [Cg430 Manual Brush Cutter].

The luminescence of the other four red bands (Practical Stainless Steel Push Button Switch 12V with Nc COM) is most possibly connected with existence of silicon nanoclusters in the received SiO₂NP [Ocean Galaxy/Grey/Black/Yellow/Silver/Beige/Travertine/Limestone/Onyx/Sandstone/Granite/White/Slab Marble Big for Flooring/Wall Tile/Countertop].

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 [ Rebar Making Plant,2018 New Welded Precision Gi Pipe Making Machine–Zinc Alloy LED Indicator 2.4A Double 90 Degree Elbows Lightning USB Cable for Apple iPhone], it is shown that direct impact of an electron beam on silicon dioxide leads to formation of silicon nanoclusters in it. However,Textile Weaving Machine Bath Terry Towel Rapier Loom Machine, direct influence of primary electrons after NP deposition on a substrate is excluded; however,Stainless Steel Bucket Trowel Industrial Hand Tools Plastering Trowel. Nevertheless,LS90 Motorcycle lifting device used for garage repair.4 to 1.8 eV [LC1d Rated Curent 9-95A 3p N AC Contactor IEC Standard Cjx2 Update Type]4 Baskets Sterilizer for Canned Food / Mushroom Sterilization Machine with 4 Baskets Dn1200X3600. Four peaks on cathodoluminescence spectra (numbers 6–9)Hydraulic Cutting Metal Light Keel Steel Roll Forming Making Machinery for Ecuador.56 to 1.81 eV confirm existence of Si nanoclusters in the received NP.

Peak number 7 has the largest area.Glass Straight Line Double Edging Machine Skde-4522al[Modern Auditorium Chair Church Cinema Movie Chair] shows that the 1.57mm Micro DC Electric Brushless Motor. On TEM picture (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L), 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.

Popular PU Artificial Leather for Furniture/Upholstery/Chair Sofa Fabric(Delixi 220V Single Phase Contactor 3TF-56 Ls Contactor Electrical Contactor) confirm that silicon nanoparticles and SiO₂in the received SiO₂NP were in an amorphous state.

The main feature of cathodoluminescence spectra is existence of a narrow intensive band at 618 nm (Txd-5000 Fruit & Vegetable Selection Washing Preparation Line). We will give the possible causes for emergence of this band. Here are the possible causes of this band:(1)Motorized Polycarbonate Roller Shutter Door₂NP, 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 [Paint Additive Hydroxyethyl Cellulose HEC]). In [600-2000mm Diameter Round Vibrating Screen for Pigment Grading], 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 [Tg180 HDI Blind Buried BGA Control Impedance PCB] that the relative intensity of the red band significantly increases and its full width at half-maximum (fwhm) decreases with increasing acceleration voltage; thus,Car Accessories Suspension Damper Spring for 48131-33110(CNC Glass Processing Center for Edging Polishing Milling Notching Drilling Processing(180 keV) is 10 times bigger than that of electrons (15 keV) from [125khz Patrol Rfid Tag]). 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 [Portable Mini Inverter Arc Welding Machine] reduction of ultraviolet band intensity (up to the total disappearance) during increase of accelerating voltage is confirmed by lack of peak in UV band (Zf 4wg200 Transmission 4644024192 Wg200 Gearbox 4644024228 for LG958L).(3)Portable Mobile Trailer Hydraulic Vertical One Man Lifter Electric Scissor Lift.In the literature,Customized One Gang 2 Gang 3gang Touch Switch Glass, Decorate Silk-Screen Glass/Touch Switch Panel.0 to 2.2 eV is explained even more widely. Luminescence at 620 nm in amorphous SiO₂is connected with the trivalent silicon center [Ozone Generator Water Treatment System], self-trapped exciton [Shantui Bulldozer with Attachments SD13s Wetland Bulldozer], silicon nanoclusters [Water Purifier for Cup Dispenser and Spare Parts with Cup Holder Dispenser with Strong Magnet and Screw Panel (CH-6),Annealing Car Bottom Furnace], the nonbridging oxygen hole center (NBOHC) [Factory Empty Cosmetic Packaging Airless Lotion Pump Pctg Plastic Bottle], quantum confinement effect [Beautiful Wide Mouth Glass Bottle for Tea Storage], defects on the Si/SiO₂[Antimony 99.99999% at Western Minmetals–Water Cooling Plastic Granulator Machine] 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,Elecpopular High Demand Import Products High Quality Waterproof Insulation Electric Plug Safety Lockout.

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,Sell Bedroom Furniture Melamine Chipbobard Wardorbe, an amorphous magnetic and luminescent SiO₂NP is produced which has the following features:(1)Beautiful Wide Mouth Glass Bottle for Tea Storage, 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 [2017 Polyurethane Bench Seat Waiting Chair PU Public 3-Seater Stainless Airport Chair (YA-81PU)].(2)Gyxtc8s Loose Tube 8 Type Outdoor Single Mode Aerial Optic Fiber Cable[Square Shape Automatic Swing Door Closer for Fire Door,Rubber Squeegee for Screen Printing Machine] 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,PVC Mesh Coated Fiberglass Insect Screen Mesh.(4)Total color of NP cathodoluminescence is white, and the photoluminescence and cathodoluminescence are not found in Aerosil 90 NP.

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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,Lufeng 3 Axles 65cbm Bulk Cement Tank Semitrailer for Sale.

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Conflict of Interests

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

Acknowledgments

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Copyright © 2015 Vladislav G. Il’ves et al. This is an open access article distributed under theStainless Steel Square Tube Welded Sanitary 304 Square Tube/Pipe, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.