hollow rectangular precast segmental piers
An experimental investigation of heat transfer and fluid flow in a rectangular duct with inclined discrete ribs
... a gap in the inclined rib roughened rectangular duct A schematic diagram of the experimental set up for heat transfer analysis is shown in Figure The wooden rectangular duct has an internal size ... rib-roughened rectangular duct Int Journal of Heat and Mass Transfer1999; 42: 1597-1615 [16] Karwa R, Experimental studies of augmented heat transfer and friction in asymmetrically heated rectangular ... walls and four-heated walls For simulating the conditions of solar air heater, only one wall of the rectangular duct is to be subjected to uniform heat flux (to substitute insolation) while the remaining...
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gas sensors using hierarchical and hollow oxide nanostructures overview
... nanosheets Under this framework, the hollow spheres can be regarded as the assembly of 1-D nanoparticles into the 3-D hollow spherical shape Thus, strictly speaking, the 0-3 hollow spheres should be regarded ... for simplicity, the various hollow and Page of 73 hierarchical structures will be referred according to the nomenclature defined in Figure The 1-3 hollow urchin and 2-3 hollow flower structures ... structures shown in Fig are treated in ip t the section of hollow nanostructures cr Strategy to prepare hollow structures for gas sensors us Hollow oxide structures have a variety of applications...
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gas sensors using hierarchical and hollow oxide nanostructures
... [74] [75] [56] [77] [78] [79,80] [81] [82] [83] ZnO 1-3 Hollow flower 0-3 Hollow 2-3 WO3 Hollow urchin 2-3 Hollow flower 0-3 Hollow 0-3 Hemi-hollowa Sol–gel using crystalline array of PS LbL deposition ... ripening Sputtering on PMMA template 0-3 3-3 Hollow Hollow Solvothermal self-assembly Vesicle template interface route [84] [85] 1-3 Hollow Hollow Hollow Hollow urchin Controlled hydrolysis and heterocoagulation ... time (s) Reference SnO2 In2 O3 ␣-Fe2 O3 Cu2 O/CuO Cu2 O/CuO CuS 0-3 Hollow 0-3 Hollow 1-3 Hollow urchin 0-3 Hollow 0-3 Hollow 0-3 Hollow 100 ppm C2 H5 OH 10–50 ppm CO 200–5000 ppm C2 H5 OH 400 ppm...
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glucose - mediated hydrothermal synthesis and gas sensing characteristics of wo3 hollow microspheres
... nano-porous morphology but a few spheres showed a hollow morphology (arrow and inset in Fig 4(c)) In contrast, most of the spheres showed a hollow morphology due to the rapid heating to HTT (R30-RH ... metal salts and transformed these spheres into metal oxide hollow spheres by the decomposition of the core carbon In the present study, the hollow morphologies were found at the R30-RH powders This ... attributed to their evolution from hollow spheres The further increase of pore volumes in the size range of 5–20 nm by the employment of rapid heating indicates that the hollow morphology of R30-RH...
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synthesis of hollow microspheres constructed with fe2o3 nanorods
... methods of hollow nanostructures in literatures [18–21], and it does not require carbon particles or surfactants In addition, the photocatalytic and magnetic behaviors of ␣-Fe2 O3 nanorodbased hollow ... that the solid microspheres became into the hollow ones from the halfbaked microsphere shown in the top right corner of Fig 3a and that in Fig 3b The hollow spheres were built from a single layer ... nanorod-based hollow microspheres During the annealing process, the ␣-FeOOH was first decomposed to Fe2 O3 and H2 O, the Fe2 O3 nucleated and grew in situ to form ␣-Fe2 O3 nanorod-based hollow microspheres...
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synthesis of single-crystalline hollow b-feooh nanorods via a controlled
... Figure SEM, TEM and HRTEM images of b-FeOOH hollow nanorods prepared as above experiment: (a) SEM image of b-FeOOH hollow nanorods, (b) TEM image of b-FeOOH hollow nanorods, (c) HRTEM image and its ... of structure is lighter than that the edge, confirming the hollow interiors of the nanorods in Figure 2b It can be seen that b-FeOOH hollow nanorods have an average diameter of 20$30 nm and an ... b-FeOOH hollow nanorods with length in the range of 70–110 nm and width in the range of 20–30 nm In particular, a process mechanism has been revealed for synthesis of single-crystalline b-FeOOH hollow...
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Báo cáo "The dependence of the nonlinear absorption coefficient of strong electromagnetic waves caused by electrons confined in rectangular quantum wires on the temperature of the system" doc
... strong EMW in a WQW on the temperature T of the system In our model, we consider a wire of GaAs with rectangular cross section ( Lx × Ly ) and length Lz , embedded in GaAlAs The carriers (electron ... mass of electron (in this paper, we select h =1) Hamiltonian of the electron-phonon system in a rectangular quantum wire in the presence of a r r laser field E (t ) = E0 sin(Ωt ) , can be written ... the nonlinear absorption coefficient of a strong electromagnetic wave by confined electrons in rectangular quantum wires on the temperature T is complex and nonlinear In addition, from the analytic...
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ENVIRONMENTAL AND AESTHETIC IMPACTS OF SMALL DOCKS AND PIERS pot
... over time in the vicinity of pile-supported piers Noble (1978) assessed the impacts of 20 piers all situated within the Southern California Bight These piers ranged from 625–2,500 feet in length ... facilities under consideration here All of the piers studied had pile spacing greater that times the diameter of the piles Noble found that these piers “had a negligible effect” on sedimentation ... benefits of the increase in private, residential docks and piers, • which coastal uses the public values and how residential docks and piers relate to those uses, and • the human use patterns for...
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The Legend of Sleepy Hollow potx
... settlers, this sequestered glen has long been known by the name of SLEEPY HOLLOW, and its rustic lads are called the Sleepy Hollow Boys throughout all the neighboring country A drowsy, dreamy influence ... firesides, by the name of the Headless Horseman of Sleepy Hollow It is remarkable that the visionary propensity I have The Legend of Sleepy Hollow mentioned is not confined to the native inhabitants ... gradually arose between him and the preceptor of Sleepy Hollow Brom, who had a degree of rough chivalry in his nature, 20 The Legend of Sleepy Hollow would fain have carried matters to open warfare...
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AIA specification for precast concrete section 34102
... erection in the precast concrete contract should be governed by local practices See PCI’s website www.pci.org for current PCI-Qualified Erectors A precast concrete erector Qualified by the Precast/ Prestressed ... satisfactory and precast concrete units comply with requirements, clean and dampen core holes and solidly fill with precast concrete mix that has no coarse aggregate, and finish to match adjacent precast ... Section “Architectural Precast Concrete.” Division Section “Cast-in-Place Concrete” for placing connection anchors in concrete and structural topping Division Section Precast Post-Tensioned...
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controlled synthesis and gas sensing properties of hollow sea urchin like
... sensing properties of hollow sea urchin-like ␣-Fe2 O3 nanostructures and ␣-Fe2 O3 nanocubes have not been studied until now In this paper, we report on controlled synthesis of hollow sea urchin-like ... the products were almost maintained Interestingly, the solid microspheres became into the hollow ones The hollow sea urchin-like nanostructures with a diameter of about m are built from a single ... diameter of about 120 nm, self-wrapping to form hollow interior (inset of Fig 3d) TEM is employed to study the structural characteristics of the hollow sea urchin-like ␣-Fe2 O3 nanostructures...
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gas sensors using hierarchical and hollow oxide nanostructures overview2
... [74] [75] [56] [77] [78] [79,80] [81] [82] [83] ZnO 1-3 Hollow flower 0-3 Hollow 2-3 WO3 Hollow urchin 2-3 Hollow flower 0-3 Hollow 0-3 Hemi-hollowa Sol–gel using crystalline array of PS LbL deposition ... ripening Sputtering on PMMA template 0-3 3-3 Hollow Hollow Solvothermal self-assembly Vesicle template interface route [84] [85] 1-3 Hollow Hollow Hollow Hollow urchin Controlled hydrolysis and heterocoagulation ... time (s) Reference SnO2 In2 O3 ␣-Fe2 O3 Cu2 O/CuO Cu2 O/CuO CuS 0-3 Hollow 0-3 Hollow 1-3 Hollow urchin 0-3 Hollow 0-3 Hollow 0-3 Hollow 100 ppm C2 H5 OH 10–50 ppm CO 200–5000 ppm C2 H5 OH 400 ppm...
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acetone sensing characteristics of zno hollow spheres prepared by
... ZnO hollow spheres after calcinations, (c) and (d) high magnification images of ZnO hollow spheres Zinc precursor Acknowledgment Glucose Calcination Hydrothermal Urea treatment Zinc nitrate ZnO hollow ... transition from loosely adsorbed zinc ions to a dense zinc oxide network in the hollow spheres The formation mechanism of ZnO hollow spheres is discussed, as shown in Fig Firstly, the formation of the ... free carrier concentration When the ZnO hollow spheres were exposed to air, oxygen molecules are firstly adsorbed on the inner and outer surface of ZnO hollow spheres and capture free electrons...
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hollow, porous, and yttrium functionalized zno nanospheres with enhanced
... which are susceptible to be dissolved, thereby producing the hollow nanospheres To shed more light on the formation mechanism of hollow, porous nanospheres, we conduct a series of time-dependent ... the hollowing effect (Fig 5(g) and (h)), and the numerous nanorods with pores on surfaces are assembled to nanospheres (Fig 5(h)) due to the dissolution and recrystallization (Fig 5(i)) The hollow ... to produce the rod-like ZnO in the shell of hollow nanospheres Meanwhile, the rotation and migration of particles induce pores, which results in the hollow and porous morphology consequently suppresses...
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Báo cáo sinh học: "Radio wave propagation in curved rectangular tunnels at 5.8 GHz for metro applications, simulations and measurements" pot
... curved rectangular tunnel Figure Comparison of measurement and simulation results in curved rectangular tunnel Figure CDF of simulation results compared to theoretical distributions in a curved rectangular ... model As presented in [16] in the case of a straight rectangular tunnel, we observe in Figure that longitudinal attenuation in the curved rectangular tunnel follows a 2-slope model until a distance ... that these results are similar to those obtained in the case of rectangular tunnels Similar studies have been conducted in the case of rectangular straight tunnels and have shown that Weibull distribution...
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