velocity conditions for gas flows
Tài liệu Welders Handbook For Gas Shielded Arc Welding, Oxy Fuel Cutting & Plasma Cutting pptx
... Suitable for manual, automated and robotic welding argon Use for sheet and plate up to 9mm thick Suitable for pulse techniques 28 WwW.oto-hui.com THE RIGHT GAS Gases for TIG welding Shielding gas ... The efficiency of the gas shield is critically dependent on the design of the nozzle tungsten electrode uniform laminar gas flow Gases for TIG welding Pure argon Suitable for all metals Alumaxx ... preferred for the welding of steels containing 5% Cr Always seek technical advice before recommending a gas for these steels Benefits of Ferromaxx less spatter smooth surface stable arc gives uniform...
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Báo cáo khoa học: Measuring enzyme activities under standardized in vivo-like conditions for systems biology pdf
... optimal conditions for the enzyme under study Thus, different conditions are used for different enzymes with respect to buffers, ionic strength, etc [6–8] As a first step, the Standards for Reporting ... Discussion In order to support coordinated efforts to standardize experimental conditions for systems biology, we have formulated an assay medium for kinetic measurements that closely resembles ... only one, and so are the cultivation conditions that we have used here The same strain and conditions have been used for other standardization efforts, e.g for transcriptome analysis [12] Thus,...
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Báo cáo " Classification and assessment of bioclimatic conditions for tourism, health resort and some weather therapies in Vietnam " pdf
... assessment of bioclimatic conditions for two ultimate purposes: (i) for the development of tourism, excursion and sea vacation activities in lowland areas; and (ii) for health resort and some ... useful information about: (i) the numbers and distribution of days per year with good weather conditions for the above purposes; (ii) classification of appropriate level of bioclimatic conditions ... best places for human health in general and for tourism, excursion and sea vacation in particular Results and discussions The results of classification and assessment of bioclimatic conditions...
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Đề tài " Stability of mixing and rapid mixing for hyperbolic flows " pot
... decay rates for mixing basic sets could be arbitrarily slow On the other hand, exponential mixing is proved for the aforementioned restricted classes of Anosov flows and also for certain uniformly ... μ ⊕ λ is in real Jordan normal form (1 × blocks for real eigenvalues, × blocks for complex eigenvalues) Let xH = (A, 0) ∈ Es be the transverse homoclinic point for p Let xH = (0, B) ∈ Eu be the ... zero for all f ∈ C r (Σ1 ) sufficiently C -close to f0 By Lemma 4.2(3), EN (Ψ, f ) is bounded away from zero, uniformly in N , for all C r pairs (Ψ, f ) sufficiently C -close to (Ψ0 , f0 ) Therefore...
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Synthesis and characterization of semiconducting nanowires for gas sensing
... 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 ... obtained for an operating temperature of 400 ◦ C for both the samples Optical characterization Photoluminescence (PL) spectroscopy was performed over a wide temperature and wavelength range for the ... solid-state gas sensors with superior performance-NANOS4” STREP project no 001528 “Nanostructured semiconductors for chemical sensing” PRIN project 2004 “Quasi mono dimensional nanosensors for label...
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aluminum-doped tio2 nano-powders for gas sensors
... 600–900 ◦ C [19] Since ionic radii for Al and Ti are close to each other (0.074 nm for Ti4+ and 0.0675 nm for Al3+ ) [20], Al can occupy a regular cation position, forming a substitutional solid ... meters, and for all of these tests, the total gas flow rate was fixed at 150 cm3 min−1 Air, pure nitrogen and CO gases were allowed to mix during their passage to the test setup Before electrical ... area for all calcination temperatures; however, a drop at wt.% Al is also seen The highest surface area of 25 m2 /g is observed for the pure TiO2 powders calcined at 700 ◦ C for h TEM images for...
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comparative study of nanocrystalline sno2 materials for gas sensor application
... to form printable ink The ink was deposited on sensor microheater platform, dried for 15 at 150 ◦ C and annealed at 700 ◦ C for 15 to reach the stabilization of the material The sensor platforms ... of propane in synthetic air at 50% RH The gas concentrations and gas humidification were prepared with gas mixing system Environics 4000 at 20 ◦ C Before the measurements all sensors were stabilized ... 10 exposition to pure carrier gas (synthetic air, 50% RH) The sensor signal was defined as a ratio Rair /Rgas , where Rgas is the sensing layer resistance in target gas atmosphere and Rair is the...
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mixed sno2 tio2 included with carbon nanotubes for gas-sensing application
... 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, ... Rotary Pump 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 ... result in a remarkable improvement of the hybrid CNTs/SnO2–TiO2 gas- sensor performance The improvement of the SnO2–TiO2 gas- sensor performance by including SWCNTs has not been well understood so...
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nanosize hexagonal tungsten oxide for gas sensing applications
... carried out in the gas flow bench set-up at SUNY, Stony Brook.12 The gases used in the sensing setup were UHP nitrogen (Praxair), UHP oxygen (Praxair), 1000 ppm ammonia in nitrogen (BOC gases) Concentration ... rates The gases were controlled through 1479 MKS Mass flow controllers whose channels were connected to a Type 247-MKS 4-channel readout which is calibrated to read the flow rate of the gases directly ... read the flow rate of the gases directly in sccm The combined flow rate of the gases was maintained at 1000 sccm The gas mixture is passed through a tube furnace (Lindberg/Blue), which Fig XRD patterns...
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novel hybrid materials for gas sensing applications made
... using a gas- tight chromatographic syringe Specifically, these concentrations were: 100, 200, 500 and 1000 ppb for NO2 ; 10 and 50 ppm for CO; 2, and 10 ppm for NH3 and 50 and 150 ppm for C6 H6 ... p-type at 1/250 wt% For the measurements performed at 250 ◦ C, the response time to 100 ppb and to 500 ppb of NO2 was around both for the hybrid materials based on WO3 and for the pure WO3 sensors ... Carbon nanotube sensors for gas and organic vapor detection, Nano Lett (2003) 929–933 [4] Y Lu, C Partridge, M Meyyappan, J Li, A carbon nanotube sensor array for sensitive gas discrimination using...
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MDEA Proven Technology for Gas Treating Systems ppt
... 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 ... that the plant produces on-spec gas over the anticipated range of process conditions For natural -gas plants, two sets of specifications apply For “pipeline quality” gas, the maximum H2S content ... anticipated process conditions quick- tivity which can be built into a gas- treating plant is the sweet -gas ly and cheaply, and to design the most efficient plant for the specification For the design...
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Đề tài " Robust transitive singular sets for 3-flows are partially hyperbolic attractors or repellers " ppt
... characterized as the hyperbolic ones Sufficient conditions for structural stability were proved by Robbin [36] (for r ≥ 2), de Melo [6] and Robinson [38] (for r = 1) Their necessity was reduced to ... is T0 > such that for any x ∈ ΛX (U ), s DXT0 /Ex < s Proof For each x ∈ ΛX (U ) there is tx such that DXtx /Ex < 1/3 Hence, for each x there is a neighborhood B(x) such that for all y ∈ B(x) ... Wloc (σY ) = ∅, for all Y near X; δ ˆ (3) Σs ∩ W ss (σY ) = ∅ for all Y near X; δ ˆs (4) For all Y near X and all y ∈ ΛY (U ) ∩ Wloc (σY ) there is t such that Yt (y) ∈ Σs ; δ (5) For all y ∈ ΛY...
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Báo cáo khoa học: Optimization of conditions for the glycosyltransferase activity of penicillin-binding protein 1a from Thermotoga maritima ppt
... platform of the Partnership for Structural Biology and the Institut de Biologie Structurale in Grenoble (PSB ⁄ IBS), for their expertise with the fluorimeter References Screening of conditions for ... Tm-1a* sequence Initial purification attempts were performed in the presence of 1% of the zwitterionic Chaps detergent, as performed previously for the isolated GTase domain [38] This allowed solubilization ... does not aggregate, led us to select CYMAL-4 for purification and storage of Tm-1a* Screening of reaction conditions of Tm-1a* in a multiwell plate format Fig Purification of CYMAL-4-solubilized...
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báo cáo hóa học: "Overground walking speed changes when subjected to body weight support conditions for nonimpaired and post stroke individuals" docx
... there were significant changes from the 0% BWS condition for each level of body weight support for velocity, cadence and average step lengths for each group Significance was evaluated at P < 0.05 ... maximum percent increase in velocity and maximum percent decrease in velocity for both subject groups by detecting the maximum values at any of the body weight support conditions (10%-40% 1.2 A ... subjects post stroke Subjects were encouraged to walk as they normally would at a comfortable pace for every trial For both subject groups, the first experimental trial consisted of walking 15 m unaided...
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Guidelines For Gas Metal Arc Welding (GMAW)_1 doc
... instructions in Maintenance Section before touching any parts FUMES AND GASES can be hazardous Welding produces fumes and gases Breathing these fumes and gases can be hazardous to your health ... in some cases, cancer (California Health & Safety Code Section 25249.5 et seq.) For Gasoline Engines: Y Engine exhaust contains chemicals known to the State of California to cause cancer, birth ... only, NOT running gear, gas cylinders, or any other accessories D Use equipment of adequate capacity to lift and support unit D If using lift forks to move unit, be sure forks are long enough to...
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Báo cáo hóa học: " Generalized conditions for starlikeness and convexity of certain analytic functions" doc
... generalized conditions for functions f(z) to be in the classes S ∗ or K Generalized conditions for starlikeness We begin with the statement and the proof of generalized conditions for starlikeness ... Some starlikeness conditions for analytic function Rev Roum Math Pures Appl 33, 117–124 (1988) Nunokawa, M, Owa, S, Polatoglu, Y, Caglar, M, Duman, EY: Some sufficient conditions for starlikeness ... Therefore, we put eiθ1 a2 = √ , eiθ2 a3 = √ , a4 = eiθ3 √ 72 Consequently, we see that the function eiθ1 eiθ2 eiθ3 f (z) = z + √ z2 + √ z3 + √ z4 72 is in the class S ∗ Generalized conditions for...
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Báo cáo hóa học: " Solvability of boundary value problems with Riemann-Stieltjes Δ-integral conditions for second-order dynamic equations on time scales at resonance" pptx
... follows, for the particular case g(t) = t we obtain the Riemann sums for delta integral We note that for a general g the image g(I) is not necessarily an interval in the classical sense, even for ... (s, x (s))| s Let ε > satisfy T[T(r1 + ε) + (r2 + ε)] < For such ε, there is δ > so that for i = 1, 2, |gi (t, x)| < (ri + ε)|x|, uniformly for t ∈ [0, T]T and |x| > δ Let 1,0 = {t : t ∈ [0, T]Ì ... Carathéodory conditions with respect to L [0, T]Ì , where L [0, T]Ì denotes that all Lebesgue Δ-integrable functions on [0, T]Ì , if the following conditions are satisfied: (i) for each (x1,...
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báo cáo hóa học: " Convergence and weaker control conditions for hybrid iterative algorithms" doc
... control conditions (C2), (C1)’, and (C5)’ hold for {ln} and {an}, η − ε, ∀n ≥ n0 for some integer n0 ≥ 0, and k2 (C5) ‘: < g ≤ lim infn®∞ an lim supn®∞ an < for some g Î (0, 1) (C1)’: < λn ≤ For ... sequence {yn} and {F(xn)} Therefore, we have lnF(xn) ® for some g > 0, we have
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báo cáo hóa học: " On ε-optimality conditions for multiobjective fractional optimization problems" pptx
... ε-efficient solutions for (MFP) and obtain εoptimality theorems for such solutions of (MFP) under weakened constraint qualifications Furthermore, we prove ε-optimality theorems for the solutions ... (¯ ) x − εi , for all i = 1, , p, gi (x) gi (¯ ) x fj (x) x fj (¯ ) < − εj , for some j ∈ {1, , p} gj (x) gj (¯ ) x When ε = 0, then the ε-efficiency becomes the efficiency for (MFP) (see ... JC: ε-Pareto optimality for nondifferentiable multiobjective programming via penalty function J Math Anal Appl 198(1), 248–261 (1996) Loridan, P: Necessary conditions for ε-optimality Optimality...
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báo cáo hóa học: " Nonlocal conditions for differential inclusions in the space of functions of bounded variations" ppt
... investigation of systems subjected to nonlocal conditions started with [9] for partial differential equations and [10] for Sturm-Liouville problems For more recent work we refer the interested ... property ℓ by ℘ℓ(X) For instance, A Î ℘c ℓ(X) means A closed in X, when ℓ = b we have the bounded subsets of X, ℓ = cv for convex subsets, ℓ = cp for compact subsets and ℓ = cp, cv for compact and ... valued if ℜ(z) is convex (closed) for each z Î X: ℜ has compact values if ℜ(z) Î ℘cv(Y) for every z Î X; ℜ is bounded on bounded sets if ℜ(A) = ∪zÎAℜ(z) is bounded in Y for all A Î ℘b(X) (i.e supzÎA{sup{|y|Y;...
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