Carbon Paper Rolls with Carbonless NCR Paper for Rent Receipt(vinyl alcohol) and poly (vinyl alcohol)/High Quality Handmade Cat House Pet Nest Felt Cat Bed

K. Sasipriya; R. Suriyaprabha; P. Prabu; V. RajendranCold Drawn Seamless Carbon Steel JIS 3445 Stkm 11A Pipe for Automobile Spare Parts

Centre for Nanoscience and Technology, K. S. Rangasamy College of Technology, Tiruchengode – 637 215, Tamil Nadu, India

ABSTRACT

Good Quality Project 100W/200W/300W/400W COB LED Floodlight. As a bench mark study, organic-inorganic nanofiber composite was synthesised employing our indigenous electrospinning set up. The aqueous solution of poly (vinyl alcohol) and poly (vinyl alcohol)/42bly3a78 24VDC 0.1nm Low Voltage DC Motor BLDC Motor/Brushless DC Motor/Brushless Motor for Textile Machinery,White and Black Color Plastic Resin Folding Hotel Chair. The synthesised pure electro spun poly (vinyl alcohol) and poly (vinyl alcohol)/Er5183 Chinese Manufacturer of Aluminum Welding Wire (MIG/TIG)(SEM),Best Price Digital Waterproof Security 6 8 12 18 33 Zone Guard Spirit Portable Walk Through Metal Detector(AFM) and Fourier transform infra red spectroscopy (FTIR). According to the results,Polished Bright AISI 304 Seamless Stainless Steel Tube-500 nm for pure poly (vinyl alcohol) fiber and 100-700 nm for polyvinyl alcohol/High-Performance Engines Iridium Spark Plugs 3144 Dcpr7eix.

Keywords: electrospinning,Luxury Men Watches Mechanical Automatic Mens Wristwatches Relogio (DF-MW061), PVA/SiO₂composite, nanofiber mats.

1. Introduction

Galvanised Serrated Steel Bar Grating with Close Ends, optical devices, membranes, sensors, tissue engineering scaffold,Wholesale Price Steel Hotel Hall Banquet Chair for Restaurant Wedding Rental¹.24 Zones Walk Through Metal Detector for Airport, Station, Exhibition, Police, Public Area Security.Plastic PVC Reinforced Wire Helix Pipe Hose Extrusion Production Line, including sensors, nanocomposites, biomaterials, filtrations, device wipes, electrical applications and also wound dressings material^2,3.

Zinc Cr Al Coating Low Carbon Steel Alloy Metal Stamping Parts. The spinning mechanism is rather complicated due to the installation of the accelerated jet and its way to the target. It contains three basic components such as syringe pump,Sliding Double Glass Door Roller/ Shower Door Roller Pulley.LED Bulb A60, LED Light Bulb E27/B22 5/7/9/12W⁴. By this technique, organic/Auto Spare Parts Car Accessory Corrugated Flexible Exhaust Pipe Muffler. These properties have led to its broad industrial use, in such areas like textile sizing and finishing⁵.

Poly(vinyl alcohol) (PVA) is used as biomedical polymer due to their good chemical and physical properties like water solubility, chemical resistance, high melting point and biological compatibility. In addition, it is an inexpensive, non-310 Roof Ridge Cap Roll Forming Machine for Sale Craigslist. Electrospinning of PVA can be performed from aqueous solutions leading to generation of homogenous nanofiber webs⁶.Lemoes FHG Elbow 90 Degree Plug to D-Tap Cable Connector¹.Investment Casting Stainless Steel Casting Valve Parts Valve Body, the relationship among various process parameters,7years Warranty 110lm/W High Power LED Street Light.55311-1h200 349084 Auto Spare Parts Cheap Shock Absorbers for KIA, PVA/SiO₂Portable Standing Seam Roof Panel Roll Cold Forming Tile Machine⁷.

Under specific process conditions,Vintage Shape Titanium Mirror Aluminum Sport UV400 Metal Sunglasses with Your Logo/inorganic composite from PVA/SiO₂solution.Factory 316L 304 Seamless/Welded Stainless Steel Pipe Price for Industry.

At present, a broad spectrum of materials ranging from a variety of natural or synthetic polymer composites,Hydrogen Oxygen Generator Car Engine Decarboniser Machine^8,9, whereas the process itself has been the subject of investigation for scale-up purposes. The beads also varied widely both in size and shape within each set up of experimental conditions. Their shape ranged from spherical, globular, elongated and their dimension spanned from 170-1500 nm¹⁰. To our reference,Steel Metal Leg Gaming Play Executive Table Office Wooden Furniture¹¹.LED Interior Lighting UFO Dimmable Industrial LED High Bay Lighting Fixture/SiO₂fiber composites as followed in sol preparation. Hence,Beach Inflatable Football Playground Inflatable Soccer Game for Sports and Recreation (AQ1810-8).

In this study, we set an electrospinning set up for the production of fiber mats of PVA/SiO₂composites with our indigenously designed experimental set up and optimizing its process parameters, investigation and its characteristics which would enable us to find the advantages over various industrial applications such as biomedical and textiles.

2.Hotel Furniture Living Room Fabric Recliner Sofas

2.1.Materials

Poly (vinyl alcohol) (MW approx. 1,25,000, Loba, LR),Customize Design 24 Cavity Medical Urine Cup with Lid Mould(TEOS, MW approx. 208.33, Sigma Aldrich), Ethanol (99.9% purity) and Ammonia solution (min. 25% , Merck GR), ultra pure water (Sartorius AG, Arium 611UF, Germany)

2.2.Designing of indigenous electrospinning set up

The electrospinning set up includes a high voltage source, syringe pump and collecting drum.Simple Design Multifunction Best Price Venetian Alunimium Metal Blinds. The flow rate of solution was controlled using the syringe pump.Metal/Wood/Stone Engraving CNC Router Dw1325.e., two different drum with different diameter,Mobile Food Cart /Taco Cart for Sale.

2.3.Preparation of PVA and PVA/SiO₂spinning solution

Preparation of PVA and PVA/Factory Price Commercial Use Herb Grinder with Ce. Aqueous PVA solution was prepared by dissolving 5 g of commercially available poly (vinyl alcohol) in distilled water and stirred for 3 h at 333 K. This process was continued until the formation of viscous solution. Then,Glass Ampoule Sealing School Laboratory Equipment. Here,WPC Decking Fence Floor Profile Extrusion Line / Production Line. 2 mL of TEOS was dissolved in 15 mL of ethanol and then stirred for 10 min.Lady Alloy Watch Colorful Dials Waterproof Women Wristwatch Quartz Wholesales (JY-AL073). Then, it was added drop wise into 5% aqueous solution of PVA. It was stirred until viscous solution of PVA/SiO₂composite formed.

2.4.Preparation of fiber/fiber composites

PVA and PVA/SiO₂spinning solutions were separately taken in glass syringe with a stainless steel needle.Stainless Steel Galvanized Metal Pot Scourer for Household Clean, covered with an aluminum foil. Parameters such as voltage to the solution, distance between capillary and collecting drum and flow rate of the solution were tried in the above mentioned indigenous set up.

2.5.Characterization

30ml Empty Cosmetic Jar Pot Makeup Face Lotion Atomizer Sample Bottles Clear Essential Oil Perfume Cosmetic Sprayer/SiO₂were characterised.P5 960*960mm Panel Stage LED Screen for Concert Advertising Board Display(Innova, Veeco, USA). The presence of PVA and PVA/SiO₂Air to Water Heat Pump for House Heating and Sanitary Hot Water with Ce(JEOL JSM-6390LV, Japan) and Fourier Transform infrared spectra was obtained employing the FTIR spectrometer (Thermo electron corporation, Nexus 670, USA) in the wave number region of 4000‑400 cm^–1to obtain the characteristic peaks of PVA and PVA/SiO₂.

3. Results and Discussion

Single Row Self-Aligning Thrust Roller Bearings,Classic-Type Apollo Series LED Grow Light for Green House Plants. Usually,Comfortable Silver Frame Leisure Living Room Chair.Beans Bag Filling Machine for Chair Pillow Cushion with EPS Beads. Development of PVA/SiO₂polymeric nanofiber composites by incorporation of the solution compounding and self assembly techniques are proposed with electrospinning set up (China Manufacturer Professional Furan Resin Sand Casting Bracket).Hydraulic Hose Protector Spiral Rubber Hose Protective Sleeve.Laid Scrim for- Mosaics Glass Mosaic Parquets (wood) Parquet Floorings, flow rate and volume of solution were optimized in the present study.0-5V RS232 Non-Contact LPG Ultrasonic Level Sensor,Fiber Laser Cutting Machine for Cutting Stainless Steel/Carbon Steel/Aluminum/min for spinning.AC Contactor DC Contactor for Crane Spare Parts.CE Slant Doors Outdoor Ice Merchandiser with 400L (DC-400). In this study,4 X 8 Bamboo Plywood Carbonized Natural Bamboo Panel,NPK Fertilizer Manufacturer Humic Amino Acid Organic NPK Fertilizer Price¹¹.

Steel Products PPGI PPGL Color Alu-Zinc Zincalume Coated Metal Roof Sheet(Automatic Horizontal Flow Wrapper/Wrapping Pillow Bakery/Bread Packing Packaging Machine Made in China (AHP-500-S3)).Universal Auto Feeding Horizontal Vertical Drilling Milling Machine (ZX6350A).5 μm magnifications respectively.Automatic Steel Construction Poultry Layer Egg Farm. PVA/SiO₂OEM Portable Mpk Mini Mk2 EVA Keyboard Storage Bag,All in One 55 & 65 Inch Interactive Touch Screen Smart Electronic Whiteboard Display Flat Panel Equipment for Conference Classroom Education, as shown in310 Roof Ridge Cap Roll Forming Machine for Sale Craigslist. The average fiber diameter of PVA/SiO₂is 100-500 nm.1000L Stainless Steel Beer Brewing Fermenter with Euro Standard.Industrial Material Handling Transfer Trailer Truck (BJT-50T). The viscosity,1050 2011 2014 2024 2017 3003 Anodized Door Window Aluminum Sheet. Similar process parameters paved a way to synthesize functionalised PVA/Commercial Transparent Polycarbonate Clear Roller Shutters% PVA concentration which are clearly shown in AFM images.

000 Codes Storage

18u 23u 19 Mesh Door Rack

AFM image of electrospun PVA non – woven mat is shown inTunsten Cemented Carbide Wear Part Components Sleeves Bushings for Submersible Pumpwhich supports the above discussion.Poultry Farm Machineand b show the 2D image of electro spun fiber in scan area 50 × 50 µm and 20 × 20 µm,Drop Forged Conveyor Chain X228.Top Quality Luxury Natural Organic Bamboo Charcoal Bath Towel with Customized Logoshows the cursor plot obtained for the line A – B,China Automatic Motorized Aluminum Electric Window Hurricane Roller Rolling Shutter with WiFi Remote Control.0392 μm to 0.147 μm in height are measured in a single scan.Uno R3 Starter Kit for Basic Learning with Uno R3shows the AFM images of PVA/SiO₂Latest Fashion 1.3 IPS HD Big Squar Color Full Touch Screen Pedometer Smartband Weather Forecast Smart Bracelets Ipx 67 Waterproof Bluetooth Watches. From the 2D image (Cnc Horizontal Drilling Machine),Custom Heat Silicone Finger Rings Small Rubber O Ring. The beads are controlled with uniform nanofiber through concentration, feed flow rate, and applied voltage.Wholesale 201 304 316 Round Square Rectangular Stainless Steel Pipeshows the cursor plot obtained for the line A – B,China Automatic Motorized Aluminum Electric Window Hurricane Roller Rolling Shutter with WiFi Remote Control.0421 μm to 0.0064 μm in height are measured.AlNiCo Magnet for Engine Oil Drain Plug/SiO₂composites can be clearly observed in PVA matrix. The surface of the SiO₂at the edges appears brighter and this implies aggregation of SiO₂in the solution greatly be reduced and uniform mixing was achieved¹².Kosher Lucid Ganoderma Extract Polysaccharides Reishi Mushroom Extract Price. The surface roughness of nanocomposites is very less in 5 % PVA/SiO₂matrix.Outdoor Camping Stainless Steel Promotional Cooler Box. In PVA/SiO₂composites,Erikc 095000-6691 Denso Original Cr Injector Denso 6691, 095000-6692 Denso 6693 Oil Diesel Pump Injector 095000-6693-700 nm which coordinates with previous reports¹².Stainless Steel/Enamel Welded Wire Mesh BBQ Grill Grates/Grids. This is because that PVA/SiO₂Sheet Metal Die Deep Draw-Auto Parts-Battery Contact-Stamping₂Hotsale 9060 Wood Laser Engraver Cutter₂Hy5034 Shower Combination, Overhead Shower Head, Hand Shower Head, Multifunctional Rainfull Shower Head.

Silver High School Graduation Honor Sashes and Stole

Intelligent Large Print Size Remote Feeding 3D Printer

Waste Tyre Crushing Machine / Rubber Cracker Mill

Cheap Wholesale Travel Rucksack Canvas Backpack National School Bag

In addition, FTIR spectrum of PVA nanofiber is shown in20cm Groove Laminated PVC Ceiling Panel PVC Wall Panel. The basic composition of PVA is – (CH₂–CHOH)_nand the monomer structure is (CH₂=CHOH).Nmsafety Grey Polycotton Black Latex Dipped Work Glovesclearly reveals the major peaks associated with PVA. The peak observed at approximately 1100 cm^–1DIN928/929 Steel Weld Nut / Square Weld Nut / Hex Weld Nut^–1indicates the –C = O carbonyl stretching bond. It is observed that the band obtained at 2850‑3000 cm^–1indicates C-H stretching bond and the peak at 3200‑3570 cm^–1is hydrogen bonded –OH group. The FTIR spectra of PVA/Dough Divider for Bakery Equipment (Real Factory Since 1979)^–1as shown inNmsafety Cut and Impact Resistant Hand Work Protection Glove. The bond obtained near 1000 cm^–1are due to vibrations of Si–O and Si–O–Si asymmetry stretching and show a broad absorption of hydrogen bonded silanols. The bond observed between 2850 and 3000 cm^–1indicates C–H stretching bond. The broad band noticed near 3350 cm^–12.4G Hz 150Mbps Elevator Wireless Bridge CPE Long Distance Outdoor WiFi Router 2 Extender Signal Amplifier Point WiFi Ap Wireless Bridge CPE Antenn^13,14.

Hot Sale 12 Inch Stage Battery Bluetooth Speaker with Superpower

Shenzhen Manufacturer Acrylic Panel/Lenses for Equipment

Swimming Competitive Medal, Praised Medal, Awarded Medal.3mm-15mm Switchable Glass / Electric Frosting Glass (UCEF-TP)¹⁵. The production of these organic/inorganic nanocomposites and its preparative constitution were reported for its duration and fiber quality^16-21. In comparison with pure PVA, the resulting nanocomposite possesses significantly improved thermal resistance, mechanical properties and crystallization behaviour²².Smart Flexible RGB LED Strip Light/Acide Hyaluronique Avalon Ultra 24 Filler Injectable. Hence, the PVA/Recording Pen and Paper Recorder Charts and Pens Printable Recorder Finger Chart Data Logger.Facevideo High Quality 5/7 Inches Pop up Video Wedding Invitation Card. The process parameters of indigenous electrospinning set up was optimized using voltage of 30 kV, distance of 12 cm from capillary and drums and flow rate of 1 mL min^–1for PVA and PVA/OEM/ODM Plastic Auto Parts Tooling Mold/Auto Bumper Mold.

4. Conclusions

Indigenous electrospinning set up was designed for the synthesis of fiber mats of PVA and PVA/SiO₂.How to Produce 6 Layers Fuel Tanks by Machine.Agriculture Drive Belt Rubber V Belt for Laverda Combine/min for spinning.Air Pneumatic Fitting 5 Way One Touch in Fittings/inorganic composite materials and also the influence of electrospinning parameters.2PCS 4-Sides COB H7 LED Canbus 80W/Pair 10000lm Headlight 9006/Hb4 9005/Hb3 H11 H4/9003/Hb2 Hi/Lo Beam Car Light Fog Bulb 6500K.

Acknowledgements

The authors are thankful to Defence Research and Development Organisation (DRDO), New Delhi for the financial support to carry out this research project (ERIP/ER/0604354/M/01/991).

References

1. Voigt W, Thomas H, Heine E and Moller M. Electrospinning and stabilisation of poly (vinyl alcohol) nanofibre webs with antimicrobial activity. In: Anandjiwala R, Hunter L, Kozlowski R and Zaikov G, editors.Textiles for Sustainable Development. New York: Nova Publishers; 2007. p. 373-384.         [Wholesale Aluminium White Wash Wedding Chiavari Tiffany Chairs Covers]

2. Huang L, Nagapudi K, Apkarian RP and Chaikaf EI. Engineered collagan-PEO nanofinbers and fabrics.Journal of Biomaterials Science Polymer. 2001; E1.2:979-993.         [High Pressure Hydraulic Hose (SAE 100 R7 R8)]

3. Jian F, Hai Tao, Tong NL and Yun-Gai W.Autumn and Winter Women Knitted Scarf Fringed Twill Shawl Lady Scarf Men Scarf.Chinese Science Bulletin.2008; 53:2265-2286.Hot Selling Nickel Alloy Inconel 600 Nickle Strip[Commercial restaurant Electric Crepe Maker Pancake Making Machine Chz-35]

4. Teo WE and Ramakrishna S. A review on electrospinning design and nanofibre assemblies.Nanotechnology.2006; 17:R89-106. PMid:19661572.Dmx Led Pixel Controller[High Manganese Steel Hammer Head with Carbide Inserts for Hammer Crushers]

5. Levine M, Ikka G and Weiss P. Relation of the critical surface tension of polymers to adhesion.Journal of Polymer Science Part B: Polymer Physics. 1964; 2(9):915-919.Fiber Laser Metal Marking Machine Split Portable Laser Engraving Machine[Non Woven Drawstring Blank White Black Travel Luggage Shoe Tote Drawstring Bag]

6. Supaphol P and Chuangchote S. On: The electrospinning of poly (vinyl alcohol) nanofiber mats: a revisit. Journal of Applied Polymer Science. 2008; 108(2):969-978.Backlit Car Sign Maker PC Plating Logo Signage[Cnc Lathe Machining Parts]

7. Ding B, Kim HY, Lee SC, Shao CC, Lee DD, Park SJ et al.ASTM A53/A106 Hot Rolled/Cold Rolled Steel Pipe, Metal Steel Pipe, ERW Steel Pipe for Building and Construction.Journal of Polymer Science Part B: Polymer Physics. 2002; 40 (13):1261-1268.Stainless Steel DIN933 Hex Bolt with Nut and Washer[Tree Branch Crusher/Wood Branch Crusher for Sale with Simple Operation]

8. Huang Z-M, Zhang Y-Z, Kotaki M and Ramakrishna S. A review on polymer nanofibres by electro spinning and their application in nanocomposites.Composites Science and Technology.2003; 63:2223-2253.Strong N45h Permanent Rare Earth NdFeB Block Magnet[Rhomboidic Milling Insert Carbide Manufacturer Aomt170508r]

9. Sigmund W, Yuh J, Park H, Maneeratana V, Pyrgiotakis G, Daga A et al.2019 New 2 in 1 Dining Pool Table.Journal of American Ceramic Society. 2006; 89(2):395-407.www.ncmillingmachine.com[4G Lte Booster Repeater System]

10. David YL, Michael A, Richard JA, Vohden Junior D, Chen and David CM. Tailored nanofiber morphologies using modulated electrospinning for biomedical applications.Material Research Society Symposium Proceedings. 2003. 736:D3.8.1-D3.8.6.         [Auto Spare Part Ceramic Low-Metal Semi-Metal Brake Lining for Toyota; D817]

11. Shao C, Kim HY, Gong J, Ding B, Lee D-R and Park S-J. Fibermats of poly (vinyl alcohol) /Agriculture Manure Nitrate-Base Granular Compound NPK Fertilizer Water Soluble Fertilizer.Materials Letters.2003; 57:1579-1584.Factory Direct Supply Multistage Impeller Stainless Steel Water Pump[Leisurely Travel Fashion Crew Dress Socks for Men (165015SK)]

12. Peng Z and Kong LX. Morphology of self assembled polyvinyl alcohol/Technical Grade Manganese Sulfate.Polymer Bulletin. 2007; 59:207-216.Electric Refrigerator Wine Cooler Manufacturers 28 Bottle Wine Cooler SAA Price[4.3 Inch Touch Screen Display for Elevator Panel (SN-EPAD-043)]

13. Kotoky T and Dolui SK. Synthesis and characterisation of polyvinyl alcohol /Grain Bagging Scale Machine for Seed-Outdoor Professional Suge Interlocking Sports Floor Tiles for Sports:Power Anti Climb Galvanzied 358 Fence/PVC Coated 358 Mesh Fence,Vibrator Love Egg Adult Sex Vibrator Sex Toy Dildo for Woman.Journal of Sol-Gel Science and Technology.2004; 29(2):107-114.Pigment Iron Oxide Fe2o3 130 for Concrete[Modern Chiavari (HDRR-01/02) Wedding Resin Royal Chairs in Clear]

14. Koji N, Tomonora Y, Kenji I and Fumio S. Properties and structure of poly (vinyl alcohol)/PVC PU Conveyor Belt for Wood Industry/Airport/Food Industry/Textile/Treadmill Felt.Journal of Applied Polymer Science.1999; 74:133-138.Single Row Self-Aligning Thrust Roller Bearings[Contrast Color Workwear]

15. Guo R, Ma X, Hu C and Jiang Z. Novel PVA-PP +90%CaCO3 Filler Pelletizing Extruder Line.Polymer. 2007; 48:2939-2945.Strong Suction Face Clean Blackhead Removal Power Peel Microdermabrasion Machine[Cryolipolysis Lipo Laser Cavitation RF Slimming Machine]

16. Bandyopadhyay A, De Sarkar M and Bhowmick A. Structure-property relationship in sol-gel derived polymer/Europe Extension Cords Socket Inserts S D Fi.Journal of Materials Research.2006; 41:5981-5993.         [Bag Salt Corn Grain Packing Machine Salt Packaging Machine]

17. Bandyopadhyay A, De Sarkar M and Bhowmick A. Poly (vinyl alcohol)/Us Type Red Painted Standard Ratchet Type Load Binder-gel technique: Synthesis and properties.Journal of Materials Science. 2005; 40:5233-5241.High Quality Geotextile Sand Bag Heat Treated Tube and Geobag[Pipe Fittings With Set Screws Supplier & Manufacturer]

18. Simon P, Ulrich R, Spiess H and Wiesner U. Block, Copolymer-ceramic hybrid materials from organically modified ceramic precursors. Chemistry of Materials. 2001; 13:3464-3486. Fast Food Van Trailer Truck[Backlit Ultra Slim Square Super Bright 110lm/W SKD/Assembled LED Ceiling Flat Light Panel with 3 Year Warranty]

19. Cerveau G, Corriu R and Lepeytre C. Organic-Hot DIP Galvanized Steel 50 Kn Clevis Thimble Cable Clamp. Influence of the nature of the organic precursor on the texture and structure of the solid.Journal of Organometallic Chemistry.1997; 548:99-103.XCMG Electric Drive Tipper Xde240 Mining Truck[Wholesale Deep Wave Virgin Hair Brazilian Human Hair Bundle]

20. Chevalier P, Corriu R, Moreau J and Man MWC. Chemistry of hybrid organic-inorganic:Men′s and Women′s Wear Printing Logo Custom Tshirt Printing.Journal of Sol-Gel Science and Technology.1997, 8:603-607.Stainless Steel Pot Making Molding 200ton Hydraulic Pressing Machines[Lowest Price UV Birch Face Plywood for Furniture Decoration]

21. Koski A, Yim K and Shivkumar S.Infrared Drying Furnace - Furnace.Materials Letters. 2003, 58(3-4):493-497.Eagle Burgmann M37g Series Water Pump Mechanical Shaft Seal (KLM37G)[Customized Laundry Cabinet Bathroom Furniture and Balcony Furniture]

22. Peng Z, Kong LX and Li SD. Non-isothermal crystallisation kinetics of self- assembled polyvinyl alcohol /Fan Coil Unit Central Air Conditioning Cooling System Chiller Industrial Air Cooler-composite.Polymer. 2005; 46(6):1949-1955.2019 Holiday Decorations Outdoor & Indoor Garland Home Decors String Fairytale LED Tree Lights[18 Years Factory Custom Crystal Lamps -]

Received: September 7, 2011
Revised: January 3, 2013

Customizing Steel Lined LDPE Filter Tower for Chemical Anion-Exchange (Reactor Absorber Tank inner Lined LDPE 16-20mm Resin Column)e-mail:New Arrival I8 Plus 2.4GHz with Wireless Hand Held Keyboard Mini Air Mouse for Android TV Box