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... nickel alloys. See page 29 for choosing the right gas. pencil torch swivel head torch pencil torch swivel head torch torch body ceramic nozzle gas lens tungsten electrode gas gas uniform laminar gas flow WwW.oto-hui.com 11 TIG ... penetration. Suitable for manual, automated and robotic welding. argon Use for sheet and plate up to 9mm thick. Suitable for pulse techniques. WwW.oto-hui.com 27 THE RIGHT GAS Gases for MIG/MAG welding Notes: ... mixture can be used for the shielding gas. The plasma arc process is also used for cutting. See page 44. plasma gas work piece tungsten electrode arc plasma jet shielding gas direction of weld keyhole...

Ngày tải lên: 25/02/2014, 10:20

... thesis on nanostructured metal oxides for gas sensing applications. His main activity regards synthesis and elec- trical characterization of metal oxides for gas sensing applications. Presently, he ... nano-devices for gas sensing. Acknowledgements Financial support from European Union and MIUR is gratefully acknowledged: “Nanostructured solid-state gas sen- sors with superior performance-NANOS4” ... is raised above the limit of decomposition for the oxide (from 600 ◦ C for zinc oxide to 1500 ◦ C for indium oxide) [16]. A controlled flow of inert gas (usually argon) is maintained during decomposition...

Ngày tải lên: 16/03/2014, 15:25

... oxides are the most widely used ceram- ics for gas sensor applications. A change in their electrical conductivity due to the presence of a target gas is used for sensing measurement. Among different ... (TiO 2 )-based gas sensors show good sensitivity and stability in adverse environments and have the potential to become the material of choice for high tem- perature gas sensors [2,3].TiO 2 forms three ... 600–900 ◦ C [19]. Since ionic radii for Al and Ti are close to each other (0.074 nm for Ti 4+ and 0.0675 nm for Al 3+ ) [20], Al can occupy a regular cation position, forming a substitutional solid...

Ngày tải lên: 19/03/2014, 16:47

... ethyl cellulose in terpineol to form printable ink. The ink was deposited on sensor microheater platform, dried for 15 min at 150 ◦ C and annealed at 700 ◦ C for 15 min to reach the stabilization of ... % of propane in synthetic air at 50% RH. The gas concentrations and gas humidification were prepared with gas mixing system Envi- ronics 4000 at 20 ◦ C. Before the measurements all sensors were stabilized ... exposition to pure carrier gas (synthetic air, 50% RH). The sensor signal was defined as a ratio R air /R gas , where R gas is the sensing layer resistance in target gas atmosphere and R air is...

Ngày tải lên: 19/03/2014, 16:47

... candidate of gas- sensing applications [15–17]. For the gas- sensing materials, there are various approaches using CNTs as the solution such as CNTs for dispersion, CNTs for composite, CNTs for filling, ... 258–263260 provide excellent gas absorption properties. These extreme absorption properties make CNTs advantageous for use in many areas of applications. For example, the gas absorption of CNTs at room ... a remarkable improvement of the hybrid CNTs/SnO 2 –- TiO 2 gas- sensor performance. The improvement of the SnO 2 –TiO 2 gas- sensor performance by including SWCNTs has not been well understood so...

Ngày tải lên: 20/03/2014, 13:04

... most used materials in electro-, photo- and gaso-chromic applications. Lately, tungsten oxides have been commonly applied as sensing layers for hazardous gas detection as well. In this work, a soft ... the authors’ group 1–3 led to the hypothesis that the ability for selec- tive detection of a particular gaseous analyte in the presence of interfering gas mixtures (i.e. sensor selectivity) is largely determined ... the gas and provide easy mechanisms for accommodating the off- stoichiometric metal: O ratio. The layered structure tungsten oxide dihydrate (H 2 WO 4 ·H 2 O) and the open structure hexag- onal form...

Ngày tải lên: 20/03/2014, 13:05

... using a gas- tight chromatographic syringe. Specifically, these concentrations were: 100, 200, 500 and 1000 ppb for NO 2 ; 10 and 50 ppm for CO; 2, 5 and 10 ppm for NH 3 and 50 and 150 ppm for C 6 H 6 . ... interesting as active materials for gas sensors is given by their huge surface area that can be exposed to gases [5]. Experimental reports have shown that upon exposure to toxic gases such as NO 2 ,NH 3 , ... p-type at 1/250 wt%. For the measurements performed at 250 ◦ C, the response time to 100 ppb and to 500 ppb of NO 2 was around 2 min both for the hybrid materials based on WO 3 and for the pure WO 3 sensors. It...

Ngày tải lên: 20/03/2014, 13:05

... comprehensive technical information on MDEA for gas sweetening on the pages that follow including selectivity, MDEA gas plant design, and analytical procedures for gas scrubbing solutions. This ... developed for high efficiency CO 2 removal in natural gas, synthetic gas and sponge iron applications. It is formulated to minimize or eliminate foaming and corrosion in amine units. MDEA-LF™ — A formulated ... MDEA. ■ DESIGNING FOR SELECTIVITY■ OTHER EQUIPMENT Table 1 Design Factors in MDEA Plants Inlet Gas Conditions Outlet Gas Requirements Inlet Temperature Natural Gas Plants: Acid Gas Partial Pressure...

Ngày tải lên: 28/03/2014, 20:20

... instructions in Maintenance Section before touching any parts. Welding produces fumes and gases. Breathing these fumes and gases can be hazardous to your health. FUMES AND GASES can be hazardous. D Keep ... Wire Feeder 9 Gas Hose 10 Shielding Gas Cylinder Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com Processes MIG (GMAW) Welding 154 557 A 2007−02 Guidelines For Gas Metal Arc Welding ... hands after handling. For Gasoline Engines: Y Engine exhaust contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For Diesel Engines: Y...

Ngày tải lên: 20/06/2014, 17:20

Ngày tải lên: 27/06/2014, 17:20

Ngày tải lên: 25/12/2013, 10:37

Ngày tải lên: 25/12/2013, 10:37

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Ngày tải lên: 25/12/2013, 10:38

Ngày tải lên: 25/12/2013, 10:41

Ngày tải lên: 25/12/2013, 10:41

Ngày tải lên: 25/12/2013, 10:41

Ngày tải lên: 25/12/2013, 10:42

Ngày tải lên: 25/12/2013, 10:42

... developed for mould making subject to alterations For all applications where lift movements are required parallel to mould opening, it is possible to use gas springs. The FIBRO Mould Line gas spring ... 65 75 85 95 105 115 125 145 170 *on request Dimensions for Spring Plungers 3479. Spring forces and stroke frequencies Temperatur-depending force increased Operating temperature- interval ( °C) Max. ... developed for mould making, is characterised by its high force, its small size, a long service life of at least 1,000,000 strokes and a constant operating temperature of 120°C. Of course, the FML gas...

Ngày tải lên: 22/01/2014, 02:20