các thông số quan tâm khi sử dụng transistor
guide to the design, selection, and application of screw feeders
Ngày tải lên :
01/04/2014, 11:52
... ranging from ship unloaders and highcapacity conveyors, to dispensing devices that meter small quantities of powder Use is also made of this form of equipment in innumerable process applications, ... handling duties, as with grain and flour handling The urge to save manual labour and deal with higher quantities of material prompted wider uses and many misapplications However, as an understanding ... ‘Sadistic’ Aggressive to surroundings Sensitive to size, shape, appearance, purity Alarmed by unquantifiable concerns Plagued with constraints or quality considerations Obsessed by regulations,...
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chemical process equipment selection and design - revised second edition
Ngày tải lên :
02/04/2014, 16:24
... pressures, levels, flows, densities (b) Abnormal quantities of raw materials, intermediates, and utilities (supply, handling, and availability) (c) Abnormal quantities and types of effluents and emissions ... choice Voltage Flow rate Flow quantity Flow ratio User’s choice Hand Current Power Time Level User’s choice User’s choice User’s choice Pressure, vacuum Pressure Quantity Radiation Speed, frequency ... equipment appear in some books, of which a selection is as follows: Figure 1.3 Notation of flow quantities in a reactor (1) and distillation column (2) A(k) designates the amount of component...
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Báo cáo hóa học: " The Influences of Cell Type and ZnO Nanoparticle Size on Immune Cell Cytotoxicity and Cytokine Induction" pptx
Ngày tải lên :
22/06/2014, 00:20
... of absolute cell numbers, and flow cytometry was used to evaluate changes in PI staining and to quantify cell death NPs were excluded from the analysis based on the absence of fluorescence signal ... the modification of cellular biomolecules [28] Recently, several types of nanomaterials including quantum dots and metal-oxide NPs have been shown to induce intracellular generation of ROS [13, ... treated with varying concentrations of 8-nm ZnO NPs for 38 h, and cell-free supernatants were used to quantify cytokine levels using an ELISA For IL-12 production, cell samples were first pretreated...
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Volume 20 - Materials Selection and Design Part 1 potx
Ngày tải lên :
10/08/2014, 13:20
... historically a part of the design and material selection process, because they not relate to the quantifiable properties (e.g., strength or toughness) or attributes (e.g., wear or corrosion resistance) ... are numerous options for product design and materials selection, and frequently they cannot be quantified This precludes the use of mathematical optimization routines and shifts the emphasis ... that must be considered during the conceptual stage of design While many of these factors are not quantifiable, they affect the ultimate cost and ability of the design to satisfy customer expectations...
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Volume 20 - Materials Selection and Design Part 2 ppsx
Ngày tải lên :
10/08/2014, 13:20
... a component, can be expected to fall To establish this uncertainty in quantitative terms, it is necessary to identify and quantify all of the factors that contribute to that uncertainty If the ... input quantities, xi, and regression parameters, Ai, as follows: y = A0 + A1f1(x) + A2f2(x) (Eq 4) In this expression, the predicted result, y, is the dependent variable, while the defined quantity, ... they are insignificant or at least controllable from an engineering perspective Many engineering quantities are continuous random variables, although some others are discrete, such as the possible...
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Volume 20 - Materials Selection and Design Part 4 docx
Ngày tải lên :
10/08/2014, 13:20
... and quantified in simple configurations where a second source of data (e.g., experimental measurements) is available It is more difficult in engineering applications of CFD to isolate and to quantify ... strain sensor element to a nonuniform strain field Of course, within a single transistor, or sometimes between adjacent transistors, the full threedimensional flow of current carriers must be analyzed, ... follow Experimental measurements, on the other hand, traditionally have been limited to global quantities or to values of flow variables at a small number of points in space and/or time Thus...
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Volume 20 - Materials Selection and Design Part 5 ppsx
Ngày tải lên :
10/08/2014, 13:20
... impact on the sustainability of the environment and the existence of an ability to establish a quantitative value for that impact within traditional economic grounds Examples of unit effects ... Each unit effect is reduced to a monetary value, normalized for risk/exposure and for material quantity Thereafter, the net impact of each increment in unit effect is the same, regardless of ... the natural vibration frequencies of a component made of it, are proportional to (E/ )1/2; the quantity (E/ )1/2 itself is the velocity of longitudinal waves in a thin rod of the material Contours...
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Volume 20 - Materials Selection and Design Part 6 doc
Ngày tải lên :
10/08/2014, 13:20
... determined processing procedures 1800 to 1880: Development of process mechanization and production quantities (especially in the ferrous industry) and improved compositional control 1880 to 1950: ... restricted to narrow composition ranges (e.g., pure silicon and stoichiometric Si3N4) However, small quantities of "dopants" may be added to, for example, pure silicon, as they are in the semiconductor ... all crystalline solids, but the extent to which they exist varies among the material classes The quantity of dislocations (the dislocation density) can be expressed in terms of their number per...
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Volume 20 - Materials Selection and Design Part 7 potx
Ngày tải lên :
10/08/2014, 13:20
... the interiors of elongated cast grain boundaries In heat-treated products containing a sufficient quantity of dispersoids the unrecrystallized structure of hot-worked-plate forgings and extrusions ... Zn-4Al shows an initial shrinkage that decreases with time The effect of copper in this alloy was quantified in a laboratory experiment where after the initial shrinkage after casting, exposure...
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Volume 20 - Materials Selection and Design Part 10 pptx
Ngày tải lên :
10/08/2014, 13:20
... susceptibility, as indicated by the three theoretical relationships shown in Fig 42, thereby highlighting the quantitative value of maintaining water-purity control Fig 42 Observed and predicted sensitivity ... systems In summary, therefore, it is apparent that the crack-prediction algorithms are able to quantitatively explain the changes in crack-propagation rates for type 304/316 stainless steel in ... softening processes occur during creep, and despite the fact that numerous studies have attempted to quantify Eq 2, it is in fact incorrect As pointed out by McCartney (Ref 6), Eq implies that an equation...
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Volume 20 - Materials Selection and Design Part 11 potx
Ngày tải lên :
10/08/2014, 13:20
... elsewhere (Ref 64, 65) A quantitative assessment has yet to be conducted because the material constants have not been suitably characterized for a specific material The quantitative assessment ... ij jk ki, and G = G ( 1, 2, 3), where I1 = aii, J2 = ( )aijaij, J3 = ( ) aijajkaki These scalar quantities are elements of what is known in invariant theory as an integrity basis for the functions ... Selection and Processing" in this Volume) Considerations such as flow and cycle time should be quantitatively included in the design and material-selection process Simple yet extremely useful...
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Volume 20 - Materials Selection and Design Part 12 pdf
Ngày tải lên :
10/08/2014, 13:20
... of the role of surface-active elements are known, the numerical calculations provide a basis for quantitative assessment of their role in the development of weld-pool geometry Fig 15 Calculated ... documented in the aircraft industry, where a typical rate of improvement might be 20% between doubled quantities This establishes an 80% learning function, that is, = 0.80 Because this example is fabricated ... production runs and considerable periods of time, the improvement is a fixed percentage between doubled quantities That is, if there is a 20% improvement between the tenth and twentieth unit, there will...
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Volume 20 - Materials Selection and Design Part 13 potx
Ngày tải lên :
10/08/2014, 13:20
... cited in this section Heat Treating, Vol 4, ASM Handbook, ASM International, 1991 J.S Kirkaldi, Quantitative Prediction of Transformation Hardening in Steels, Heat Treating, Vol 4, ASM Handbook, ... models can be used for point-by-point comparison (with experiments) and to view distributions of quantities such as residual stresses or phases throughout the part Based on the transient response ... International, 1992, p 251-258 Heat Treating, Vol 4, ASM Handbook, ASM International, 1991 J.S Kirkaldi, Quantitative Prediction of Transformation Hardening in Steels, Heat Treating, Vol 4, ASM Handbook,...
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Materials Selection and Design (2010) Part 2 ppt
Ngày tải lên :
11/08/2014, 14:20
... for deciding the quantitative goals in room Room is benchmarking by customers (market research), as well as strategic goal setting Room is benchmarking by technical tests Then the quantitative goals ... the output Room contains the names of the specifications for the new product Room contains the quantified goals for the new product For example, for a car, one column would specify the horsepower, ... specifications (to examine conflicts or synergy); 7, weighting of importance of each characteristics; 8, quantitative goals for new product The other rooms in the house of quality are to help the PDT to...
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Materials Selection and Design (2010) Part 1 docx
Ngày tải lên :
11/08/2014, 14:20
... historically a part of the design and material selection process, because they not relate to the quantifiable properties (e.g., strength or toughness) or attributes (e.g., wear or corrosion resistance) ... are numerous options for product design and materials selection, and frequently they cannot be quantified This precludes the use of mathematical optimization routines and shifts the emphasis ... that must be considered during the conceptual stage of design While many of these factors are not quantifiable, they affect the ultimate cost and ability of the design to satisfy customer expectations...
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Materials Selection and Design (2010) Part 3 ppsx
Ngày tải lên :
11/08/2014, 14:20
... overall environmental consequences of industrial activities and to provide decision makers with a quantitative assessment of the environmental consequences of an activity Such an assessment permits ... and resources, as well as generated wastes) associated with a particular product or process are quantitatively inventoried, the environmental impacts of those burdens are assessed, and opportunities ... inventory (LCI) It is in this stage that the various inputs and outputs (energy, wastes, resources) are quantified for each phase of the life cycle As depicted in Fig 3, systems boundaries are defined...
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