heat of phase transition mixing chemical bonding
Báo cáo hóa học: " Influences of phase transition and microstructure on dielectric properties of Bi0.5Na0.5Zr1-xTixO3 ceramics" potx
... the purpose of this work is to investigate influences of the occupancy of Ti4+ ions at the B-site of Zr4+ host ions with Zr/Ti ratios of 0.7:0.3, 0.6:0.4, 0.5:0.5, and 0.4:0.6 on phase transition ... The phase transition for the Zr/Ti ratio (0.6:0.4) found in this study was in agreement with the previous report of Yamada et al [6] who mentioned that the approximate phase transition point of ... temperature of 800°C for 15 with a heating/cooling rate of 5°C/min on a covered alumina plate Microstructure of etched materials was observed using a backscattered-electron mode of a scanning...
Ngày tải lên: 20/06/2014, 23:20
báo cáo hóa học:" Influences of phase transition and microstructure on dielectric properties of Bi0.5Na0.5Zr1-xTixO3 ceramics" pptx
... The phase transition for the Zr/Ti ratio (0.6:0.4) found in this study was in agreement with the previous report of Yamada et al [6] who mentioned that the approximate phase transition point of ... temperature of 800°C for 15 with a heating/cooling rate of 5°C/min on a covered alumina plate Microstructure of etched materials was observed using a backscattered-electron mode of a scanning ... isovalent substitution of Ti ion not only reduced the unit cell dimension, but also promoted the phase transition at the composition of Bi0.5Na0.5Zr0.6Ti0.4O3 SEM-BEI images of Bi0.5Na0.5Zr1-xTixO3...
Ngày tải lên: 21/06/2014, 17:20
mass and heat transfer analysis of mass contactors and heat exchangers (cambridge series in chemical engineering)
... Colburn Professor of Chemical Engineering at the University of Delaware Professor Russell is a member of the National Academy of Engineering and a Fellow of the American Institute of Chemical ... recipient of several national honors, including the AIChE Chemical Engineering Practice Award Anne Skaja Robinson is an Associate Professor of Chemical Engineering at the University of Delaware ... We will illustrate this aspect of analysis by examining chemical reactors, heat exchangers, and mass contactors, equipment of particular interest to chemical professionals Determining model behavior...
Ngày tải lên: 02/04/2014, 15:52
Experimental and numerical investigation of heat transferand phase change phenomena during excimer laser interactionwith nickel
... temperature Tc 9[7Tc 9[8Tc Enthalpy of fusion Lsl Thermal conductivity of solid phase "W m−0 K−0# Speci_c heat of solid phase "J kg−0 K−0# Thermal conductivity of liquid phase\ kl 7899 kg m−2 Liquid ... instead of a Gaussian distribution commonly seen for other types of laser[ The size of the laser spot on the target surface is several millimeters\ while the heat di}usion depth is of the order of ... rapid transition from superheated liquid to a mixture of vapor and liquid droplets[ The explosive phase change phenomenon was _rst investigated in detail in the earlier work of pulsed current heating...
Ngày tải lên: 06/05/2014, 08:55
Báo cáo hóa học: " Effects of NiO nanoparticles on the magnetic properties and diffuse phase transition of BZT/NiO composites" potx
... addition, the two phase transition temperatures merged into a single diffuse phase transition at higher NiO contents (Figure 4d) To check the effect of NiO on the degree of the diffuse phase transition, ... Examination of the dielectric spectra showed that the NiO additive promoted a diffuse phase transition, and the two phase transition temperatures, as observed for BZT93, merged into a single phase transition ... Dielectric properties and phase transition Figure shows plots of the relative permittivity and loss tangent as a function of temperature at various NiO concentrations Two phase transition peaks in...
Ngày tải lên: 20/06/2014, 23:20
summary of the doctor thesis studying of the phase transition in linear sigma model
... studies of chiral phase transition in compactified space – time are in first stage so far The aims of thesis - Studying of the phase structure of LSM and LSMq with two different forms of symmetry ... Characteristics of the phase diagram at different value of as at is the same MeV - In chiral limit, chiral phase transition of UQ is always first – order, meanwhile for TQ chiral phase transition ... different value of - In physical world, chiral phase transition for UQ has both first – order and crossover Two kinds of phase transition are sapareted by a CEP For TQ chiral phase transition is...
Ngày tải lên: 09/07/2014, 08:17
báo cáo khoa học: " Cold- and light-induced changes in the transcriptome of wheat leading to phase transition from vegetative to reproductive growth" pot
... induced phase transition, their profiles of abundance would suggests that TaAGL33 is a repressor of flowering and TaAGL42 a promoter The complete lack on response of both genes in the spring wheat, ... Dubcovsky J: Positional cloning of the wheat vernalization gene VRN1 Proceedings of the National Academy of Sciences of the United States of America 2003, 100:6263-6268 Page 13 of 14 (page number not ... those of Trevaskis et al [22] then, rather than with results that indicate a direct role for VRN2 in vernalisation Recent discussions of the genetic control of phase transition in barley and wheat...
Ngày tải lên: 12/08/2014, 03:20
Thz spectroscopy study of metal insulator phase transition on vanadium dioxide
... 7.1.1 Ultrafast photoinduced phase transition behaviors in VO2 120 7.1.2 Effect of oxygen stoichiometry on phase transition in VO2 121 7.1.3 Size effects on phase transition behaviors in single ... the mechanism of MIT The results about depressed phase transition temperature show an intriguing possibility of designing different room-temperature phase transition device x LIST OF TABLES Table ... VO2 nanobelt with width of m as a function of increasing temperature (b) The phase transition temperatures of several VO2 nanobelts on heating process as a function of the nanobelts width The...
Ngày tải lên: 10/09/2015, 09:27
FIRST ORDER PHASE TRANSITION AND MAGNETIC PROPERTIES OF EPITAXIAL FERH THIN FILMS
... initially heated from 25 to 130oC and subsequently cooled back to 25oC Width of hysteresis (THysteresis), width of transition (T), and transition onset temperature (THeating) of out -of- plane ... Width Width of Transition Onset temperature of transition 70 60 50 40 30 20 10 49 50 51 52 53 Rh content (at%) Figure 3.7 Width of hysteresis (THysteresis), width of transition (T), and transition ... ferromagnetic transition, could be recovered through high temperature post-annealing which undergoes three distinct phases of transformation The first phase consisted of a rapid disappearance of FCC phase...
Ngày tải lên: 02/10/2015, 17:15
Encapsulation of phase change materials for heat storage
... = total amount of heat storage/release (J) m = mass of heat storage material (g) cp = specific heat capacity of heat storage material (J kg-1 °K-1) Tm = melting temperature of heat storage material ... directly into the heating area (Hasnain, 1998) Latent heat storage The term “latent heat storage” can be generally described as the storage of heat in the form of latent heat of fusion, vaporization ... Temperature profiles during heat storage stage 93 Figure 4.32: temperature profiles during heat release stage 93 Figure 4.33: Heat storage with time during heat storage stage 95 Figure 4.34: Heat release...
Ngày tải lên: 05/10/2015, 21:22
FIRST ORDER PHASE TRANSITION AND MAGNETIC PROPERTIES OF EPITAXIAL FERH THIN FILMS
... initially heated from 25 to 130oC and subsequently cooled back to 25oC Width of hysteresis (THysteresis), width of transition (T), and transition onset temperature (THeating) of out -of- plane ... Width Width of Transition Onset temperature of transition 70 60 50 40 30 20 10 49 50 51 52 53 Rh content (at%) Figure 3.7 Width of hysteresis (THysteresis), width of transition (T), and transition ... ferromagnetic transition, could be recovered through high temperature post-annealing which undergoes three distinct phases of transformation The first phase consisted of a rapid disappearance of FCC phase...
Ngày tải lên: 06/10/2015, 21:06
ON a PHASE TRANSITION OF NUCLEAR MATTER IN THE NAMBU JONA LASINIO MODEL
... degree of freedom of ANM The equation of state of ANM given in (12) is our principal result The DBA was used to compute numerically the density dependence of NSE and other physical quantities of ... the result of Ref.[14] ON A PHASE TRANSITION OF NUCLEAR MATTER IN 123 • The symmetry pressure Psym = ρ0 L/3 = 4.34 107 MeV4 = 0.0286 fm−4 which is very useful for structure studies of nuclei ... are the propagators of nucleon, sigma, omega and rho mesons, respectively; σ, ω and ρ are expectation values of the sigma, omega and rho fields in the ON A PHASE TRANSITION OF NUCLEAR MATTER IN...
Ngày tải lên: 30/10/2015, 19:50
INFLUENCE OF SIZE EFFECTS ON STRUCTURAL PHASE TRANSITION AND DOMAIN STRUCTURE OF FERROELECTRIC NANO SIZED BATIO3 RODS
... transformation of cubic to tetragonal phase in the wire type A1 and type A2 The phase transition occurs more easily in the wire of type A For example, even just 4U length of A2 type wires has tetragonal phase ... = 1.01 is limited to a tetragonal phase Through pictures, we can see that the larger the size of BaO surface is, the faster the phase transition is, the phase transition can observe more clearly ... tetragonal phase, we introduce characteristic ratio c/a [4, 5] If ratio c/a ≥ 1.01, we have tetragonal phase in the material The phase transition from cubic to tetragonal phase is gradual transition, ...
Ngày tải lên: 30/10/2015, 20:53
ON a PHASE TRANSITION OF BOSE GAS
... particular, phase transitions of the system ON A PHASE TRANSITION OF BOSE GAS 67 To proceed further it is interesting to consider the high temperature regime, T /µ Introducing the effective chemical ... ON A PHASE TRANSITION OF BOSE GAS 63 local minimum of the potential It fulfills λ φ = 0, −µφ0 + (2) yielding (for φ = 0) µ φ20 = (3) λ Now let us focus on the calculation of effective ... providing the evolution of Vβ [φ0 , T ] with respect to φ0 2.0 M1 10 11eV 1.5 1.0 0.5 0.0 100 200 300 400 T nK Fig The T dependence of M1∗ 500 600 ON A PHASE TRANSITION OF BOSE GAS 69 1.4 1.2...
Ngày tải lên: 30/10/2015, 20:54
THE SURROUNDED ATOM THEORY OF ORDER DISORDER PHASE TRANSITION IN BINARY ALLOYS
... ORDER-DISORDER PHASE TRANSITION 133 where pαα (pαα ) is the possibility of an α atom (unlike α- atom) being nearest neighbour of a given αatom Let Vα (j) be the potential energy of an αatom having ... that the lattice of alloy on perfectly ordered state is devided into two sublattices of labels a and b Then the number of A atoms on a sites NAa is equal to NA and the number of B atoms on b sites ... means the fraction of A atoms in the a sublattices and Cα (α = A,B)is the fraction of αatoms in the crystal In this way η = for the ordered phase and η = for the disordered phase Concerning the...
Ngày tải lên: 31/10/2015, 10:44
Gián án Chapter 9 Chemical Bonding I:Lewis Theory
... addition of more of the system energy Chemistry, Julia Burdge, 2nd e., McGraw Hill Bonding • a chemical bond forms when the potential energy of the bonded atoms is less than the potential energy of ... of the metal is larger than the electron affinity of the nonmetal, therefore the formation of ionic molecules is endothermic Na(s) + ½Cl2(g) → NaCl(s) ∆H°f = +147 kJ/mol • However, the heat of ... Bonding Theories • explain how and why atoms attach together • explain why some combinations of atoms are stable and others are not why is water H2O, not HO or H5O • one of the simplest bonding...
Ngày tải lên: 28/11/2013, 01:11
Tài liệu Chapter 10 Chemical Bonding II
... • properties of molecular substances depend on the structure of the molecule • the structure includes many factors, including: the skeletal arrangement of the atoms the kind of bonding between ... McGraw Hill 27 Effect of Lone Pairs The bonding electrons are shared by two atoms, nonbonding electrons are localized on the central atom, so area of charge is removed from so some of the negative ... like bonding electron groups • relative sizes of repulsive force interactions is: Lone Pair – Lone Pair > Lone Pair – Bonding Pair > Bonding Pair – Bonding Pair • this effects the bond angles,...
Ngày tải lên: 28/11/2013, 01:11
Chemical bonding and molecular geometry( liên két hóa học và hình học phân tử)
... otherwise, without the prior permission of Oxford University Press Library of Congress Cataloging-in-Publication Data Gillespie, Ronald J (Ronald James) Chemical bonding and molecular geometry from ... The VESPR model Bottom left: Contour map of the electron density Bottom right: Contour map of L Printing (last digit): I Printed in the United States of America on acid-free paper ... 0-19-510495-1 (cloth) I Chemical bonds-History Molecules-Models I Popelier, P.L.A II Title III Series QD461.G5372001 541.224-dc21 00-025404 Cover Illustration: Representations of the SCl z molecule...
Ngày tải lên: 07/02/2014, 22:00
Chemical bonding and molecular geometry( liên kết hóa học và hình học phân tử)
... otherwise, without the prior permission of Oxford University Press Library of Congress Cataloging-in-Publication Data Gillespie, Ronald J (Ronald James) Chemical bonding and molecular geometry from ... The VESPR model Bottom left: Contour map of the electron density Bottom right: Contour map of L Printing (last digit): I Printed in the United States of America on acid-free paper ... 0-19-510495-1 (cloth) I Chemical bonds-History Molecules-Models I Popelier, P.L.A II Title III Series QD461.G5372001 541.224-dc21 00-025404 Cover Illustration: Representations of the SCl z molecule...
Ngày tải lên: 07/02/2014, 22:44