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A CFD analysis on the effect of ambient conditions on the hygro-thermal stresses distribution in a planar ambient airbreathing PEM fuel cell
Ngày tải lên :
05/09/2013, 14:58
... membrane hydration and avoidance of water flooding in the cathode catalyst layer and /or gas diffusion layer [2] Water management is related with air supply to the cathode and is one of the crucial ... performance but also in eventual rupture of the membrane Thermal management is also essential for the control of the water evaporation or condensation rates [1-3] The need for improved lifetime of ... accounts for both gas and liquid phase in the same computational domain, and thus allows for the implementation of phase change inside the gas diffusion layers The model includes the transport of gaseous...
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The new drawing on the right side of the brain betty edwards
Ngày tải lên :
27/07/2014, 08:02
... masking tape • A small mirror, about 5” x 7”, that could be attached to a wall, or any available wall or door mirror • Something to use as a drawing board a breadboard or a sturdy piece of cardboard, ... than the rather hard surface of the drawing board.) Sit at arm’s length (about to 2½ feet) from a mirror Lean your board up against the wall, resting the bottom of the board on your lap Look at ... eyesight and average eye-hand coordination—with sufficient ability, for example, to thread a needle or catch a baseball Contrary to popular opinion, manual skill is not a primary factor in drawing...
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Báo cáo y học: " Influence of passive leg elevation on the right ventricular functio" doc
Ngày tải lên :
12/08/2014, 19:22
... variation is due to the changes of one or more of the related factors (preload, afterload or contractility) [20,21] Ejection fraction, more than a measurement of ventricular performance, can consequently ... 93 /A- 432H-7.5F; Baxter Edwards Healthcare Laboratories, Santa Ana, CA, USA) positioned before induction under local anaesthesia General anaesthesia was induced with etomidate (0.15 mg/kg), fentanyl (5 ... (Palo Alto, CA, USA) monitor (model 7853 C) and registered on a five-channel Hewlett Packard strip chart recorder, and data recorded by the Explorer computer (Baxter Edwards Healthcare Laboratories)...
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Báo cáo y học: "Impact of attention-deficit/hyperactivity disorder on the patient and family: results from a European survey" ppsx
Ngày tải lên :
13/08/2014, 18:21
... relationships, as assessed by parents A secondary aim of the survey was to investigate the parental assessment of the effect of stimulant medication on the behaviours of their children with ADHD ... validity of the ADHD diagnosis and provide more stringent selection criteria In addition, analyses designed to critically evaluate the impact, on the course and outcome of ADHD, of a range of variables ... thank, Frances Gambling, Medicus International, for her editorial assistance Editorial assistance was funded by Janssen Cilag References CA has been a speaker for Janssen-Cilag and participated...
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Báo cáo sinh học: " Genetic parameters related to environmental variability of weight traits in a selection experiment for weight gain in mice; signs of correlated canalised response" pot
Ngày tải lên :
14/08/2014, 13:22
... proposed the use of a Bayesian approach for canalisation analysis to better manage the model defined by San Cristobal-Gaudy et al [29] This Bayesian approach has previously been used in a mice population ... generations as a consequence of a correlated decrease in the environmental variability However, these changes in the environmental variance depend on the functional relationship between mean and variance ... For each variance, √ a scale parameter (“shrink” factor, R) was computed, which involves variance between and within chains The shrink factor can be interpreted as the factor by which the scale...
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Investigation of thickness and orientation effects on the III v DG UTB FET a simulation approach
Ngày tải lên :
08/11/2015, 17:08
... orthogonalized form of the original true atomic orbitals Secondly, the Löwdin orbitals are the atom-like orbitals The atom-like orbitals preserve the atomic symmetry of the original orbitals from which they ... structure is a single column along the different atomic layers, the Hamiltonian will only consist of the diagonal terms and two first order off-diagonal terms The Hamiltonian is in the following form, ... schematic One parabolic band is drawn at the top of energy barrier for illustration Uscf is the the self-consistent potential at the top of the barrier For a ballistic transistor, the density of...
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The Influences of Budgetary System in a Selection of Large Chinese companies in the Industry of Electronic Household Appliances
Ngày tải lên :
10/12/2016, 13:48
... in organization theory, this theoretical framework treats individuals as rational ones who can make decisions based on reasonable analysis Also, the profit maximization is the overall goal of the ... organizational objectives and they give hints to the theoretical foundation of the responsibility accounting In general, these theories share the assumption that organizations are rational entities ... the view of industrial society and regard ‘technological and organizational rationalization’ as the ‘cognitive driving force of modernization’ would take economic rationality as an explanation...
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The text doesn’t stop at the end of the page (or does it) an exploration of how the novel form responds to digital interactivity through the cross sited novel ‘once in a lifetime
Ngày tải lên :
04/12/2015, 14:00
... question of how longform narrative in particular will fare as a result As a storyteller writing a novel set in a contemporary context, I became aware of the possible use-value of social media, in the ... someone please get these shagging bastard doors off my head!” That’s hard That’s all hard But not the actual break-up, that’s easy It’s the day after the break-up that’s hard, and the next day and ... GeorgienHeathcliff, or Georgienheath, or Heathngeorgie or Fuckfacencockhead, or – and then the phone rang and rang and rang and rang and rang I took this incessant ringing as a sign, not that...
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An investigation into the style of the english language used in advertising slogans issued by some world - famous airlines
Ngày tải lên :
07/11/2012, 14:54
... Shuttle! Air Canada Defy obstacles Air Canada Canada World class, worldwide Air France France Air France One of the best places on earth AIR INDIA India New Zealand your place in the sky Being there ... our power to any addition or subtraction Going beyond expectations - Malaysia Airlines Cathay Pacific The heart of Asia – Cathay Pacific Airways Use of questions Questions help to arouse the curiosity ... on the radio, or dazzling on the TV On the other hand, they still need the information to guide their purchasing Therefore, to attract the consumers’ attention is the most important task for an...
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reducing the degree or intensity of, or eliminating, pollution
Ngày tải lên :
24/04/2013, 14:40
... considered to have air quality as good as or better than the national ambient air quality standards as defined in the Clean Air Act An area may be an attainment area for one pollutant and a non-attainment ... ng Asbestos Assessment: In the asbestos-in-schools program, the evaluation of the physical condition and potential for damage of all friable asbestos containing materials and thermal insulation ... or fog The dry forms are acidic gases or particulates Acid Mine Drainage: Drainage of water from areas that have been mined for coal or other mineral ores The water has a low pH because of...
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Tài liệu Minimization or Maximization of Functions part 1 pptx
Ngày tải lên :
15/12/2013, 04:15
... than those using only the function, but not always enough so as to compensate for the additional calculations of derivatives We can easily construct examples favoring one approach or favoring the ... that also require evaluations of the derivative of that function In the multidimensional case, this derivative is the gradient, a vector quantity Algorithms using the derivative are somewhat more ... Practical Optimization (New York: Academic Press) Acton, F.S 1970, Numerical Methods That Work; 1990, corrected edition (Washington: Mathematical Association of America), Chapter 17 Jacobs, D .A. H (ed.)...
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Tài liệu Minimization or Maximization of Functions part 2 docx
Ngày tải lên :
15/12/2013, 04:15
... that you are able to bracket the minimum in the first place We consider this initial bracketing to be an essential part of any one-dimensional minimization There are some one-dimensional algorithms ... hark back to the ancient Pythagoreans This optimal method of function minimization, the analog of the bisection method for finding zeros, is thus called the golden section search, summarized as ... routines of this chapter will often call for a user-supplied argument tol, and return with an abscissa whose fractional precision is about ±tol (bracketing interval of fractional size about 2×tol)...
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Tài liệu Minimization or Maximization of Functions part 3 pdf
Ngày tải lên :
15/12/2013, 04:15
... (the best abscissa) at the midpoint of a and b, and therefore fractionally accurate to ±tol Indulge us a final reminder that tol should generally be no smaller than the square root of your machine’s ... ITMAX is the maximum allowed number of iterations; CGOLD is the golden ratio; ZEPS is a small number that protects against trying to achieve fractional accuracy for a minimum that happens to ... distance tol from a point already evaluated (or from a known bracketing point) The reason is that, as we saw in equation (10.1.2), there is simply no information content in doing so: the function...
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Tài liệu Minimization or Maximization of Functions part 4 ppt
Ngày tải lên :
15/12/2013, 04:15
... however: All of the algorithms after this section will make explicit use of a one-dimensional minimization algorithm as a part of their computational strategy This section implements an entirely ... making flamboyant use of derivative information in one-dimensional minimization But we have met too many functions whose computed “derivatives” don’t integrate up to the function value and don’t accurately ... 1-800-872-7423 (North America only) ,or send email to trade@cup.cam.ac.uk (outside North America) In principle, we might simply search for a zero of the derivative, ignoring the function value information,...
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Tài liệu Minimization or Maximization of Functions part 5 docx
Ngày tải lên :
15/12/2013, 04:15
... from the high point, (b) a reflection and expansion away from the high point, (c) a contraction along one dimension from the high point, or (d) a contraction along all dimensions towards the low ... If any point of a nondegenerate simplex is taken as the origin, then the N other points define vector directions that span the N -dimensional vector space In one-dimensional minimization, it was ... for a step in the downhill simplex method The simplex at the beginning of the step, here a tetrahedron, is shown, top The simplex at the end of the step can be any one of (a) a reflection away...
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Tài liệu Minimization or Maximization of Functions part 6 pptx
Ngày tải lên :
15/12/2013, 04:15
... which must slalom down the length of a valley floor that twists one way and another (and another, and another, – there are N dimensions!) Along the long direction, a quadratically convergent method ... that the calculation of each component of the gradient takes about as long as evaluating the function itself In that case there will be of order N equivalent function evaluations both with and ... is the function value at an “extrapolated” point somewhat further along the proposed new direction Also define ∆f to be the magnitude of the largest decrease along one particular direction of the...
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An investigation into the effects of brainstorming and giving a text as model on phan dinh phung high school student's attitude and writing ability
Ngày tải lên :
18/12/2013, 10:08
... view on the use of brainstorming Table 8: The reasons of approval of the application of brainstorming in the future Table 9: The reasons for disapproval of application of brainstorming in the ... ideas in a variety of ways 10 Having a range of vocabulary As can be seen from the diagram above, ideas and a range of vocabulary are always demonstrated by writers If writers have poor ideas and ... the effects of giving a text as a model Chart 8: The control groups views on the use on the use of giving a text as a model Tables 10: The reasons for the approval the application of giving a...
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Tài liệu Minimization or Maximization of Functions part 7 pptx
Ngày tải lên :
24/12/2013, 12:16
... such a matrix A sequence of directions hi is constructed, using only line minimizations, evaluations of the gradient vector, and an auxiliary vector to store the latest in the sequence of g’s The ... (North America only) ,or send email to trade@cup.cam.ac.uk (outside North America) The vectors satisfy the orthogonality and conjugacy conditions 10.6 Conjugate Gradient Methods in Multidimensions ... lines, and traverses a straight line until a local minimum is reached, where the traverse is parallel to the local contour lines A common beginner’s error is to assume that any reasonable way of...
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Tài liệu Minimization or Maximization of Functions part 8 ppt
Ngày tải lên :
24/12/2013, 12:16
... decrease the function; we may move too far for the quadratic approximation to be valid All we are guaranteed is that initially f decreases as we move in the Newton direction Once again we can use ... we imagine that our arbitrary function f(x) can be locally approximated by the quadratic form of equation (10.6.1) We don’t, however, have any information about the values of the quadratic form’s ... http://www.nr.com or call 1-800-872-7423 (North America only) ,or send email to trade@cup.cam.ac.uk (outside North America) and updates the information that is accumulated Instead of requiring intermediate storage...
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Tài liệu Minimization or Maximization of Functions part 9 pdf
Ngày tải lên :
24/12/2013, 12:16
... by a series of exchanges In each exchange, a right- hand variable and a left-hand variable change places At each stage we maintain a problem in restricted normal form that is equivalent to the original ... thus far Fundamental Theorem of Linear Optimization Imagine that we start with a full N -dimensional space of candidate vectors Then (in mind’s eye, at least) we carve away the regions that are ... it The variables thus chosen are called left-hand variables or basic variables, and there are exactly M (= m3 ) of them The remaining N − M variables are called right- hand variables or nonbasic...
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