1—elastic and thermal properties of mass concrete

... Thermal Stresses and Temperature Control of Mass Concrete Thermal Stresses and Temperature Control of Mass Concrete Zhu Bofang China Institute of Water Resources and Hydropower Research and ... Variation of Temperature and Thermal Stress of Mass Concrete with Time The Variation of Temperature of Mass Concrete with Time Because of the large size, the variation of temperature in a mass concrete ... of thermal stress and temperature control of mass concrete, including two basic theorems of creep of nonhomogeneous concrete structures, the law of variation, and the methods of computation of...

Ngày tải lên: 21/04/2015, 13:38

... MWCNT in case of former and with wt% in case of the latter Electrical Properties Fig SEM images of a raw, b acid modified-MWCNTs and c amide-MWCNTs As in the case of TS, the YM of the amide-MWCNTs/ ... readings of voltage drops at different portions of the sample Result and Discussion FTIR Studies Characterization Fourier Transform Infrared Spectroscopy Functionalization of MWCNTs and conversion of ... duration and prolonged use between 200 and 350 °C without much deterioration in mechanical and other properties Polyimides are produced by the condensation reaction of an aromatic dianhydride and...

Ngày tải lên: 22/06/2014, 01:20

... (2009) 4:420–430 and ‘c’ is the amount (phr) of prevulcanized SBR gel added into the NR latex Characterization of Gelled Latex Samples and Measurements of Various Properties of Gel Filled Rubbers ... increase in the amount of crosslinking tends to level off, as evident from gel content and crosslink density values of SBS2/SBS3 and NS2/NS3 systems This is because of the saturation of sites available ... matrix and SBS gels were mixed with NR at a given concentration, to investigate their effect on the morphology, mechanical, dynamic mechanical and thermal properties of raw SBR and NR Morphology of...

Ngày tải lên: 22/06/2014, 01:20

... (b)] and x= 0.5 [(c) and (d)] and x= 0.6 [(e) and (f)] compounds 106 Figure 3.23: Temperature dependence of ′ and ′′ at f = 100 kHz [(a) and (b)] and f = MHz [(c) and (d)] under 0H ... [(a) and (b)] and x= 0.2 [(c) and (d)] compounds 105 Figure 3.22: Temperature dependence of  and ’’ under zero field for selected frequencies (f = 0.1-5 MHz) for x= 0.4 [(a) and (b)] and x= ... Magnetocaloric effect and magnetothermopower in xLaxSr0.3MnO3 Sm0.7- 196 6.1.2 Electrical, magnetic and magnetothermal properties of La0.7-xPrxCa0.3MnO3 198 6.1.3 Electrical and thermal transport...

Ngày tải lên: 10/09/2015, 09:11

... (a) Volume fraction of polymer (Φ) as a function of no showing fraction of chains in the random conformation(ξ) of 0.5, 0.7 and 0.9 ξ is obtained from quantitative modeling of each UV-vis solution-state ... length of PBTTT repeat unit; Mn,o is the number average molecular weight given by [(no* molar mass of repeat unit) + molar mass of end unit) 30 2.3.2 Determination of chain conformational properties ... 63 Figure 3.5 d-spacings of (100), (200) and (010) as a function of temperature (010) spacing of rrP3HT of 3.76Å is also shown 64 Figure 3.6 Dependence of crystallinity on temperature...

Ngày tải lên: 11/09/2015, 09:57

... Hot Topics in Thermal Analysis and Calorimetry Volume Series Editor: Judit Simon, Budapest University of Technology and Economics, Hungary Thermal Properties of Green Polymers and Biocomposites ... CHARACTERIZATION OF GREEN POLYMERS Thermal Analysis 13 Other Characterization Methods 25 Chapter THERMAL PROPERTIES OF CELLULOSE AND ITS DERIVATIVES Introduction 39 Thermal Properties ... high profile research subjects in academic and industrial fields The authors of this book have continuously made efforts to investigate the properties, especially thermal properties, of green...

Ngày tải lên: 11/08/2014, 06:20

... characteristics of the "Sassi of Matera" and "Trulli of Alberobello" In the South of Italy, the sites of the "Sassi of Matera" (Figure 1a) (classified as humanity world heritage in 1993) and "Trulli of Alberobello" ... consisted of the measurement of thermal conductance of two different typologies of building wall: a wall in blocks of calcarenite sandstone assembled with mortar, typical of the constructions of "Sassi ... Polytechnic of Bari, were performed on some samples of calcarenite sandstone and calcareous stone of Fasano The goal of the laboratory tests was to experimentally find the thermophysical properties of...

Ngày tải lên: 05/09/2013, 14:58

... mRNA and also of its own transcript For this reason, the level of mRNA for the wildtype form of MCPIP and the level of mRNA for IL-1b (Fig 5A, lane 3) were lower in comparison to the level of mRNA ... clarify the dynamics and features of this protein Role of MCPIP in regulation of the endogenous IL-1b transcript level After identification of a PIN domain in the MCPIP by use of bioinformatics, ... lanes 2,3 and 4, lower band) The levels of mutant and wild-type MCPIP mRNAs were higher when these vectors were co-transfected with a vector overexpressing IL-1b (Fig 5, lanes and 4, upper bands)...

Ngày tải lên: 18/02/2014, 14:20

... the metal particles, (ii) formation of liquid droplet of metal and Si/SiOx and (iii) the precipitation in the form of solid nanowires after super-saturation of liquid metal–Si/SiOx droplet at ... of crystalline Si core and amorphous SiO2 outer shell structure as confirmed by HRTEM image and SAED pattern On the other hand, the formation of crystalline Si–SiO2 core-shell nanowires first and ... agglomerated clusters consisting of high density of nanowires The magnified view of a single cluster is depicted in the inset of Fig 2(d) These observations suggest that growth of nanowires in the present...

Ngày tải lên: 16/03/2014, 15:18

... in terms of the projection of energy band in bulk Si and confinement effect: the confinement decreases the energy of HO states and increases the energy of the LU states, but the magnitude of the ... is 1.5 Â 10À3 e/Å3 The wave functions of p- and p*-like bands on Si(1 1)-(2 Â 1) surfaces are also shown on the inset of (a) and (b), respectively p*-like bands on {1 1} facets, respectively This ... energy of nanowire in the supercell, lSi (lH) is the chemical potential of an Si (H) atom, nSi (nH) is the number of Si (H) atoms, and ez is the zero-point energy of Si–H vibrations The value of...

Ngày tải lên: 16/03/2014, 15:37

... ultrasonication time effects on sediment and the thermal conductivity of the carbon nanotubeethylene glycol nanofluids and found that thermal conductivity of the nanofluids increased with sonication ... B and n are constants, and t is the sonication time The data in Figures 13 and 14 were fit to curves of the forms given by (Equations and 2) The values of the constants and the coefficients of ... Ultrasonication effects on thermal and rheological properties of carbon nanotube suspensions Binglu Ruan*1,2 and Anthony M Jacobi1 Mechanical Science and Engineering, University of Illinois, Urbana,...

Ngày tải lên: 21/06/2014, 17:20

... Hot Topics in Thermal Analysis and Calorimetry Volume Series Editor: Judit Simon, Budapest University of Technology and Economics, Hungary Thermal Properties of Green Polymers and Biocomposites ... CHARACTERIZATION OF GREEN POLYMERS Thermal Analysis 13 Other Characterization Methods 25 Chapter THERMAL PROPERTIES OF CELLULOSE AND ITS DERIVATIVES Introduction 39 Thermal Properties ... high profile research subjects in academic and industrial fields The authors of this book have continuously made efforts to investigate the properties, especially thermal properties, of green...

Ngày tải lên: 27/06/2014, 15:20

... CTBN and the EP, and to investigate the thermal, mechanical, and morphological properties of the modified EP EXPERIMENTAL 2.1 Materials The clear epoxy 331, with an epoxide equivalent weight of ... effect of CTBN content on the glass transition temperatures (Tg) of the EP Properties of Modified Epoxy Resin 3.3 Tensile Properties Table shows the effect of CTBN content on the tensile properties ... flexural strength and modulus of modified EPs A similar trend was found in the case of the tensile properties; the flexural strength and modulus of modified EPs are lower than those of the unmodified...

Ngày tải lên: 07/08/2014, 14:20

... Conformation of thermal analysis apparatuses 1.1 Thermogravimetry (TG) 1.1.1 TG-differential thermal analysis (DTA) Thermogravimetry is the branch of thermal analysis which examines the mass change of ... equipments Sample mass is obtained using a weighing balance In order to obtain reliable data, the number of the specimens should be more than three and significant figures of size and those of mass should ... (Japanese) Liu, Z and Hatakeyama, T eds 1994, Handbook of Thermal Analysis, Beijing, Chemical Industry Press (Chinese) Hatakeyama, T and Quinn, F X., 1994, Thermal Analysis Fundamentals and Applications...

Ngày tải lên: 11/08/2014, 06:20

... structure of natural cellulose and the structure of water vary as a Thermal Properties of Cellulose and Its Derivatives 65 function of Wc, Cp water and Cp cellulose changes as a function of Wc Accordingly, ... Tg (∆Cp) and molecular mass of NaCMC (DS = 1.4) [24] Definition of ∆Cp (see Figure 2.10) Thermal Properties of Cellulose and Its Derivatives 49 Figure 3-14 shows heat capacity curves of sodium ... Figure 2-20) of the OH band at 3360 cm-1 and OD band at 2530 cm-1 were calculated using the band of 2900 cm-1 (CH and CH2 stretching) as an internal standard Using an internal standard, differences...

Ngày tải lên: 11/08/2014, 06:20

... representative curves of relative baseline optical density of OH stretching band of various types of lignin as a function of temperature The relative optical density of OH stretching band starts to decrease ... 5-6) and intermolecular distance (Figure 5-7) and heat capacity increase at glass transition 2.1.2 Effect of molecular mass Molecular mass and molecular mass distribution (Mw,/ Mn, where Mw is mass ... sample mass = ca mg, N2 flow rate = 10 ml min-1 Lignin 181 Figure 5-10 Relationship between Tg and molecular mass of fractionated dioxane lignin (DL) 2.1.3 Effect of thermal history Temperature of...

Ngày tải lên: 11/08/2014, 06:20

... observed between Tg and Tm of KLPCL and those of ALPCL 100 H /Jg -1 80 60 40 20 -20 10 20 30 -1 CL/OH Ratio / mol mol Figure 6-39 Change of ∆H's of Tcc and Tm with CL/OH ratio in AL- and KLPCL KLPCL, ... schematic chemical structure of LigPCL is shown in Figure 6-34 2.2 Thermal properties Figures 6-35 and 6-36 show part of the stacked magnified DSC heating curves of ALPCL and KLPCL with various CL/OH ... the thermal degradation of PCL with lower values of CL/OH ratios may be affected by thermal degradation of the lignin core structure in KLPCL derivatives Figure 6-41 shows the change of Td and...

Ngày tải lên: 11/08/2014, 06:20

... number of moles of isocyanate groups per gram of MDI, WMDI the weight of MDI, MLig the number of moles of hydroxyl groups per gram of lignin, WLig the weight of lignin, MPEG the number of moles of ... of MLP, DTd2 corresponds to the thermal degradation of PEP and DTd3 corresponds to the thermal degradation of PPG As shown in Figure 7-26, the presence of three kinds of DTd is clearly seen and ... KLTPU and KLPPU Figures 7-44 (B) and 7-44 (C) show the change of σ10, σy and E with KL contents of KLDPU, KLTPU and KLPPU The values of σ10, σy and E of KLDPU, KLTPU and KLPPU decrease with increasing...

Ngày tải lên: 11/08/2014, 06:20

... lignosulfonate (LS) and molasses (ML) are described Preparation of geocomposites which are prepared by the reaction of PU-based geostabilizers in sand and the mechanical and thermal properties of the above ... amount of water was excluded from the sand using a corking hand gun In this stage, the mass of sand increases ca 16 %, (4) the surface of the sand is flattened, (5) a pre-determined amount of PEG ... formed on the surface of the sand and the mass of PU is negligible for ρ of composites When compression strength (σ) of KLPPU, LSPPU and MLPPU is plotted against content of lignin or molasses...

Ngày tải lên: 11/08/2014, 06:20

... Conductivity of Metals? • Drude model: Sea of electrons – all electrons are bound to ion atom cores except valence electrons – ignore cores – electron gas Schematic model of a crystal of sodium ... R=V/I; σ=E/j=neµ) Ohms/square ⇒ Note, if L=W, then R= ρ /t independent of magnitude of L and W Useful for working with films of thickness, t R R R 3.225 © H.L Tuller-2001 17 How to Make Resistance ... from electric force on electron! 3.225 © E.A Fitzgerald-1999 Equation of Motion - Impact of Collisions Assume: • probability of collision in time dt = dt/τ • time varying field F(t) v(t+dt) = (1-...

Ngày tải lên: 11/08/2014, 14:20