function—the design of the pathway of systemic venous return to the pulmonary arteries
Optimal design of PEM fuel cells to generate maximum power: A CFD study
Ngày tải lên :
05/09/2013, 14:58
... inside the cell and the Mises stresses in the membrane will decrease The effect of membrane thickness on the fuel cell performance is mostly on the resistance of the proton transport across the ... shows the distribution of the temperature inside the MEA during the cell operating at base case condition In general, the temperature at the cathode side is higher than at the anode side, due to the ... performance to investigate the in situ total displacement and degree of the deformation of the polymer membrane of PEM fuel cells The model is shown to be able to understand the many interacting, complex...
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considerations for design of concrete structures subjected to fatigue loading
Ngày tải lên :
24/10/2014, 15:46
... characteristics of a button head are influenced by the wire cutoff method, the type of heading equipment, the geometric characteristics of the head, the properties of the seating block, and the type of wire ... significant The criteria for the fatigue life of the pavement is the appearance of the first structural crack in the slab The basic tool of the designer using this method is a set of flexural design ... limitations and variations in the pattern This applies to the height of the deformations, the slopes on the walls of the deformations, and also to the fillets at the base of the deformations An analytical...
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The design of mat foundations
Ngày tải lên :
16/10/2012, 10:43
... below the active soil zone Expansive soils are most prevalent on the Atlantic and Gulf coastal plain and in some areas of the central and western United States Photograph of the construction of the ... Details of a mat foundation, serving as the slab of a one-story basement Compensated mat foundations If zero settlement is desired, the excavated soil weight will be equal to the weight of the building, ... 112.5 psf The average pressure increase in the clay layer is, ∆qavg = (qtop + 4qmiddle + qbottom ) Using Boussinesq’s modified curves for L/B ≠ (on the next slide), 1) At the top of the clay layer,...
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Tài liệu The Design of Rolling Bearing Mountings P2 ppt
Ngày tải lên :
25/12/2013, 05:17
... table Therefore, the rigidity of the thrust bearings is especially important To increase the rigidity, the thrust bearings are preloaded to 40 kN by Belleville spring washers at the upper end of the ... of js5 .The bearing seats for the outer rings are machined to G6 The spring preload remains effective in all operating conditions as the expansion of the rotating parts due to the effects of heat ... reason the brief texts concentrate on the rolling bearing aspects of the applications The operation of the machine allows conclusions to be drawn about the operating conditions which dictate the...
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Tài liệu The Design of Rolling Bearing Mountings P1 pptx
Ngày tải lên :
25/12/2013, 05:17
... is made up of the weight of the rotor and the two variable top and bottom fan impellers as well as the thrust of these fan impellers They are supported by the upper thrust bearing The radial ... representing the motor torque versus the driving time The cubic mean of the motor torque and an average speed, which is also determined from the operating graph, form the basis for the rolling ... value of 1.5 In addition, the rotor weight, the unilateral magnetic pull and the unbalanced load have to be taken into account As the Drive end 3: Three-phase current standard motor The 2ZR design...
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Tài liệu The Design Of Manufacturing Systems P2 docx
Ngày tải lên :
19/01/2014, 18:20
... suggested that the tolerance modeler should not only store the tolerances but should be capable of storing the meaning of the tolerances in the data structure The guidelines for developing a tolerance ... Mechanism to capture the design intent for its use in managing the propagation of design changes Based on the discussion so far it is clear that neither the design by features approach nor the automatic ... discontinuous They suggested the use of topological spaces to represent both design and manufacturing However, many possible choices of topology could exist and the issue as to whether topology can...
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Tài liệu The Design Of Manufacturing Systems P1 pptx
Ngày tải lên :
19/01/2014, 18:20
... in the various markets and the operating costs of processes, the problem is then to decide the operating level of each process and amount of each chemical in the list to be purchased and sold to ... restricted to a prescribed level Instead of restricting the dispersion of the solution vectors, the approach to restrict the dispersion of the random recourse costs can also be considered Because the ... prescribed tolerance, then set NPVЈ ϭ NPV and repeat steps and Otherwise, start the branch and bound procedure or any other algorithm to find the optimum to the current formulation The advantage of this...
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Tài liệu The Design of Rolling Bearing Mountings P1 docx
Ngày tải lên :
23/01/2014, 04:20
... is made up of the weight of the rotor and the two variable top and bottom fan impellers as well as the thrust of these fan impellers They are supported by the upper thrust bearing The radial ... representing the motor torque versus the driving time The cubic mean of the motor torque and an average speed, which is also determined from the operating graph, form the basis for the rolling ... value of 1.5 In addition, the rotor weight, the unilateral magnetic pull and the unbalanced load have to be taken into account As the Drive end 3: Three-phase current standard motor The 2ZR design...
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Tài liệu The Design of Rolling Bearing Mountings P2 pdf
Ngày tải lên :
23/01/2014, 04:20
... in the rolling gap In order to still achieve the thickness tolerances of the sheets in the micrometer range, the deflection is compensated for by inclining of rolls and and by counterbending of ... grinding the bearing inner rings and the roll body to finished size in one setting at a roll surface temperature of 220 °C .The inner rings and the roll body can be ground together due to the fact ... through the rolls, heating the O.D.s, depending on the material, to up to 220 °C (rigid PVC), which ensures a good processibility of the material Rolls 1, and are subjected to deflection under the...
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Tài liệu The Theory of the Design of Experiments doc
Ngày tải lên :
25/01/2014, 08:20
... sufficiently dominant to justify continued use of the phrase the theory of evolution.” But this dominance prevails only because we continue to put too much store in a gene-centric view of the evolutionary ... among other things, to explain the existence of large amounts of so-called junk DNA, but some of this DNA now appears to have a biological function Many biologists may argue that the modern synthesis the ... more frequently than “theory of evolution” in the scientific literature Why does the phrase “theory of evolution” appear nearly 16 times as frequently as “theory of ecology” in the scientific literature...
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Tài liệu The Design Of Manufacturing Systems P2 pptx
Ngày tải lên :
25/01/2014, 13:20
... suggested that the tolerance modeler should not only store the tolerances but should be capable of storing the meaning of the tolerances in the data structure The guidelines for developing a tolerance ... Mechanism to capture the design intent for its use in managing the propagation of design changes Based on the discussion so far it is clear that neither the design by features approach nor the automatic ... discontinuous They suggested the use of topological spaces to represent both design and manufacturing However, many possible choices of topology could exist and the issue as to whether topology can...
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Tài liệu The Design Of Manufacturing Systems P1 docx
Ngày tải lên :
25/01/2014, 13:20
... in the various markets and the operating costs of processes, the problem is then to decide the operating level of each process and amount of each chemical in the list to be purchased and sold to ... restricted to a prescribed level Instead of restricting the dispersion of the solution vectors, the approach to restrict the dispersion of the random recourse costs can also be considered Because the ... prescribed tolerance, then set NPVЈ ϭ NPV and repeat steps and Otherwise, start the branch and bound procedure or any other algorithm to find the optimum to the current formulation The advantage of this...
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Chapter 15 introduction to the design of electric machinery
Ngày tải lên :
16/02/2014, 18:55
... by the tooth at radius rsi, θtb the angle spanned by the tooth at radius rsb, wtb the width of the tooth base, dtb the depth of the tooth base, dtte the depth of the tooth tip edge, and dttc the ... between the tooth Thus wstR = rstθ st (15.2-31) The width of slot between the base of the tips is taken as the average of the distance of the chord length of the inner corners of the tooth tips at the ... that the reciprocal of wsiR is set to the average of the reciprocals of the chord lengths between inner corners of slot at the top of the slot (under the tooth tip) and the outer corners of the...
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Tài liệu The Design of Prestressed Concrete Bridges ppt
Ngày tải lên :
18/02/2014, 18:20
... order to reduce the thrust of the roof, it is made of lightweight concrete, of which the density reduces towards the crown Also, the underside of the roof is relieved by caissons, which fulfil the ... applies to the design of members and details of a bridge as well as to the structure as a whole The detailed shape of the towers for the two-level Ah Kai Sha cable-stayed bridge designed by Benaim to ... decided to omit the cross-beams, and to provide the necessary stability by designing the towers as vertical cantilevers, built into the pile caps 18 The nature of design Support for the deck, in the...
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Tài liệu Global Change and the Function and Distribution of Wetlands ppt
Ngày tải lên :
18/02/2014, 20:20
... Despite the migration of the solar equator (the latitude where the sun’s rays hit the Earth perpendicular to the surface) between 23.5°N and 23.5°S latitudes over the course of the year, there ... capacity to store the amount of carbohydrates needed to survive a minimum of three months of complete winter darkness, nor to produce the carbohydrates they would have required via photosynthesis ... stratospheric clouds to warm the Arctic, but also on the composition and quality of the organic matter (leaves) to support methanogenic bacteria The annual turnover of leaf biomass of the bottomland...
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Tài liệu SCRIBE: The design of a large-scale event notification infrastructure? doc
Ngày tải lên :
19/02/2014, 18:20
... forwarders for topic ½½¼¼ The subscription of node ¼½½½ causes the other two nodes along the route to become forwarders for the topic, and causes them to add the preceding node in the route to their children ... and stores the credentials in the topics set This Scribe node becomes the rendez-vous point for the topic The topicId is the hash of the topic’s textual name concatenated with its creator’s ... numerically closest to topicId The Scribe deliver method adds the topic to the list of topics it already knows about (line of Figure 3) It also checks the credentials to ensure that the topic can be...
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Tài liệu Novel Design of an Integrated Pulp Mill Biorefinery for the Production of Biofuels for Transportation pot
Ngày tải lên :
26/02/2014, 14:20
... using the exhaust gasses of the recovery boiler to further reduce the mixture to the 80% solids concentration The energy consumed by the evaporators is around 4.4 GJ/ton of pulp [14] Canadian Office ... Steam is used at the beginning of the process to soften the incoming wood chips Next, the same process as the refiner pulping is completed to produce the pulp Compared to the other mechanical ... in the collection of inorganic sulfur in the bottom of the reactor During that process a mixture of 12 sodium sulfide and sodium carbonate forms at the bottom of the typical recovery boiler The...
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Báo cáo khoa học: Protein transport in organelles: The composition, function and regulation of the Tic complex in chloroplast protein import pptx
Ngày tải lên :
07/03/2014, 03:20
... because the demand of the chloroplast is ‘sensed’ inside the organelle, the IEM is closest to the origin of the signal, and thus regulation at the Tic complex could be one of the fastest ways to react ... Hsp93 The motor activity of this AAA+ ATPase probably accounts for most of the ATP requirement of the import reaction, exerting the pulling force on the incoming precursor The SPP is thought to ... characterization of the single domains provided valuable insight into the possible functional role of Tic40: the Sti1-like region of Tic40 was shown to be functionally equivalent to the Sti1 domain of human...
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