Early age thermal stress analysis of concrete
Early age thermal stress analysis of concrete
... Early age thermal cracking of concrete The goal of this chapter is to provide brief review of preceding work on early age thermal cracking of concrete and study the importance of early age material ... devised to measure the thermal properties of concrete at early- age This method provides for the continuous measurement of early- age thermal properties of concrete in view of the thermal properties ... case of thermal stress analysis of mass concrete, accurate input of the rate of heat generation due to hydration of concrete is pertinent It is also imperative that time-dependent properties of concrete...
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Early age thermal stress analysis of concrete
... Early age thermal cracking of concrete The goal of this chapter is to provide brief review of preceding work on early age thermal cracking of concrete and study the importance of early age material ... devised to measure the thermal properties of concrete at early- age This method provides for the continuous measurement of early- age thermal properties of concrete in view of the thermal properties ... case of thermal stress analysis of mass concrete, accurate input of the rate of heat generation due to hydration of concrete is pertinent It is also imperative that time-dependent properties of concrete...
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Báo cáo nghiên cứu khoa học: "Application SDOF model to seismic base sliding analysis of concrete gravity dams subjected to earthquake load" pot
... Bureau of Reclamation; Design of gravity dams: Design Manual for Concrete Gravity Dams; Denver, Colorado; 1976 R A MIR and C A TAYLOR An investigation in to base sliding response of rigid gravity dams ... downstream sliding of rigid concrete gravity dams subjected earthquake loads The main menu of DAS program is showed in figure Figure The main menu of DAS program Verification of model As the ... suitable for base sliding analysis of low to medium height gravity dams, around 20-60m height In general, dams of this height have relatively high fundamental frequencies, which tend to be outside...
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Synthesis and stress analysis of germanium nanocrystals embedded in dielectric matrices 1
... 4 .10 : XTEM image of Sample B annealed at 10 00°C in forming gas (10 % H2 + 90% N2) for 15 minutes Figure 4 .11 : XTEM image of Sample C annealed at 800°C in forming gas (10 % H2 + 90% N2) for 15 minutes ... image of Sample A annealed at 800°C in forming gas (10 % H2 + 90% N2) for 15 minutes Figure 4.3: XTEM image of Sample A annealed at 900°C in forming gas (10 % H2 + 90% N2) for 15 minutes The inset ... between 800°C to 10 00°C for 15 minutes in forming gas (10 % H2 + 90% N2) Figure 4.7: Raman spectra of Sample C annealed between 800°C to 10 00°C for 15 minutes in forming gas (10 % H2 + 90% N2)...
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Synthesis and stress analysis of germanium nanocrystals embedded in dielectric matrices 2
... comparison of the growth of Ge nanocrystals in silicon oxide and HfAlO matrices - 1 02 - Chapter 5 .2 Results & Discussions II Ge nanocrystals in HfAlO matrix In order to synthesize the Ge nanocrystals in ... almost insoluble in silicon oxide [20 ,21 ], whereas it has been found that thermal processing of HfO + Ge systems can lead to the formation of hafnium germinate (HfGeOx) [22 ,23 ] The formation of the ... 20 04 [ 12] Q C Zhang, N Wu, L K Bera, and C X Zhu, “Study of Germanium Out-Diffusion in HfO2 Gate Dielectric of MOS Device on Germanium Substrate”, Mater Res Soc Symp Proc., vol 829 , pp 449, 20 04...
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Synthesis and stress analysis of germanium nanocrystals embedded in dielectric matrices 3
... annealed for 15 inset is the typical Raman spectra of as-grown and Ge nanocrystals nanocrystals of annealing minutes The free standing As mentioned in Section 4 .3, Figures 4.8 and 4.11 show that, ... a tensile stress will result in an increase in the lattice spacing and, hence, a decrease in the wavenumber of the vibrational mode In the case of compressive stress, the decrease of the lattice ... annealing time was increased from 15 to 60 minutes As such, the nanocrystals would grow and increase in number as the annealing duration increases, which causes an increase in P shown in Figure 6.5...
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Synthesis and stress analysis of germanium nanocrystals embedded in dielectric matrices 4
... competing factors which will influence the stress state of the nanocrystals in dielectrics, one is the capping effect and the other is temperature-dependent intrinsic tensile strain of SiN film ... atoms and therefore the growth of the nanocrystals In addition, it is interesting to note from the inset of Figure 7.1 (e), unlike the nanocrystals of the RTA sample shown in the inset of Figure ... hence resulting in a build-up and increase in stress On the other hand, a furnace annealing at 800°C for 15 minutes allows the growth of the nanocrystals due to its longer annealing time This...
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Synthesis and stress analysis of germanium nanocrystals embedded in dielectric matrices 5
... discussed in the following sections 8.4 Synthesis of Ge nanocrystals in U-shape groove In order to minimize the shadowing effect and make a relatively conformal film deposition, the KOH etching process ... bottom of the groove (i.e 70.6°) as comparing to the one of the corner of the mesa (i.e 144.7°) This difference in the arriving angle will inevitably cause the shadowing effect and results in the ... enhanced when the annealing temperature exceeds the melting point of Ge (i.e 937°C) By creating the U-shape groove substrate and hence increasing the Si/silicon oxide interfaces, one enables...
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Báo cáo nghiên cứu khoa học: "Analysis of Early-age cracking in restrained ring specimens of high performance concrete using finite element method" pdf
... the two rings are constantly in contact and as the concrete ring dies, strain gages monitor the steel ring strain In the finite element analysis the strain information was used as input using the ... the ring specimens using ANSYS software were modeled by cubic threedimensional as shown in Fig The elements of steel ring and concrete ring are continuous at nodes because the inner surface of concrete ... strength of concrete (f’ t) The ring specimens The FEM of the ring test was performed using the software of ANSYS The dimensions of the ring setup and the boundary conditions are shown in Fig The ring...
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Early age deformation characteristics of high performance concrete
... and type of coarse aggregate on the autogenous shrinkage and drying shrinkage of high- performance concrete, and to establish a relationship between the autogenous and total shrinkage of concrete ... on the drying shrinkage of concrete, and Swayze (1960) showed that higher shrinkage of cement paste does not necessarily 16 Chapter Literature Review mean higher shrinkage of concrete made with ... understanding of the deformation behavior of high- performance concrete The causes and mechanisms of the autogenous shrinkage have been proposed (Tazawa, 1998) Factors affecting the autogenous shrinkage...
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Early age deformation characteristics of high performance concrete
... and type of coarse aggregate on the autogenous shrinkage and drying shrinkage of high- performance concrete, and to establish a relationship between the autogenous and total shrinkage of concrete ... on the drying shrinkage of concrete, and Swayze (1960) showed that higher shrinkage of cement paste does not necessarily 16 Chapter Literature Review mean higher shrinkage of concrete made with ... understanding of the deformation behavior of high- performance concrete The causes and mechanisms of the autogenous shrinkage have been proposed (Tazawa, 1998) Factors affecting the autogenous shrinkage...
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Báo cáo y học: " Transcriptome analysis of murine thymocytes reveals age-associated changes in thymic gene expression"
... immunoglobulin chains were also found to be significantly increased in aged thymocytes Understanding the changes in gene expression in thymocytes with age may hold the key in determining thymocyte fate ... the increased levels of many of these genes identified in the array analysis Moreover, Western blot analysis of thymocyte lysates also confirmed that IgM increases with age (Figure 3) Flow cytometry ... antibody-producing cells in the thymus, even with advancing age Western blot analysis of IgM quantities demonstrated levels of IgM heavy chain in the thymocytes of 24-month-old mice as high as in...
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Numerical analysis of externally prestressed concrete beams part 2
... surface of cross section -118- 900 21 50 21 50 27 5 D2 D1 1700 25 0 P 325 P 1800 1700 100 520 0 Beam s A1 and A2 21 50 21 50 900 27 5 P D2 D1 1700 1800 375 325 P 1700 520 0 Beam s B1 21 50 21 50 900 27 5 D1 D2 ... e2θ ; * v1 = v1 ; * v2 = v2 ; θ 1* = θ ; * 2 = 2 ; where e1 and e2 are the eccentricities of cable at the deviators and 2, respectively -114- (6.7) u2*,v2*,θ 2* Cable v1 u1 e2 v2 θ 2* 2 u2 ... responses of beams A1-B1 120 Applied load [kN] 100 80 60 40 Beam A2 20 Calc Exp Calc Exp 0.08 0.1 Beam B2 -0. 02 0. 02 0.04 0.06 0. 12 Displacement [m] b) Load-displacement responses of beams A2-B2 Fig.6.14...
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Numerical analysis of externally prestressed concrete beams part 1
... [K 11 ] 1 ({ΔF1 } + {R1 } − [K 21 ]{ΔU }) (2.22) {ΔF2 } = [K 22 ]{ΔU } + [K12 ]{ΔU } − {R2 } (2.23) K 12 ⎤ K 22 ⎥ ⎦ ⎧ ΔU ⎫ ⎬ ⎨ ⎩ΔU ⎭ (1) ⎧ ΔF ⎫ ⎧ R ⎫ = ⎨ 1 +⎨ 1 ⎩ΔF2 ⎭ ⎩ R2 ⎭ ⎡ K 11 ⎢K ⎣ 21 Solving ... (3 .18 a) 12 K 6K 12 K 6K ⎤ ⎡ ⎢0; − L3 ; − L2 ; 0; L3 ; − L2 ⎥ ⎣ ⎦ 12 K 1+ L2 (3 .18 b) ⎡ 12 ⎛ 12 K ⎞ 6 12 ⎛ 12 K ⎞ ⎤ 0; − + x; ⎜ − − ⎟ + x; 0; − x; ⎜ − ⎟ + x⎥ ⎢ L⎠ L ⎦ 12 K L L L L ⎝ L ⎝ L L ⎠ L 1+ ... element of matrix [Kc] can be defined as below equations: M N K c 11 = ∑∑ j =1 k =1 K c12 = M N ∑∑ M N L2 i b jk E jk j =1 k =1 K c13 = ∑∑ b jk E jk TsL4 i b jk E jk j =1 k =1 TsLi (q k +1 − q k...
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Tài liệu TRANSIENT and STEADY STATE THERMAL ANALYSIS OF HEATSINK Pro/ENGINEER and Pro/MECHANICA Wildfire doc
... “ Temperature Distribution of Heat Sink” Under Design Study and Analysis, make sure that Transient_ Analysis is selected Note that Transient_ Analysis is the name of analysis previously given Click ... option, and click OK -> Done 27 Create a Steady State Thermal Analysis From Analysis pull-down menu, select Mechanica Analyses/Studies From File pull down menu, select New Steady State Thermal ... Transient Thermal Analysis Create a transient thermal analysis with Single-Pass Adaptive convergence method For some runs, the Quick Check convergence method may be used to get a quick reading of the...
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