Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: December 2014
Authors: Qiang Li, Tao Ping Chen, Ru He, Shang Yi Qi
Hydrolysis degree is one of the important indexes of polymer quality inspection, it is the important parameter that can effect polymer solution structure, rheological properties and chemical mechanical stability, which is especially important in the application of high temperature and high salt reservoir【3,4】, and it has great reference value to know the polymer form in field and further enhance oil recovery of reservoir after polymer flooding.
HPAM polymers under the condition of high temperature occurred molecular degradation and hydrolytic degradation is the main mechanism of polymer chemical degradation, and it is also the main factor that affects and limits the HPAM polymer application in high temperature and high salinity reservoir, and accurately determining the hydrolysis degree is an important basis for polymer application【5,6】.
Therefore, this article propose to do a system study to the change law of hydrolysis degree of BH heat-resistant polymer, discuss the effect of high temperature hydrolysis on the properties of BH heat-resistant polymer solution, and provides the basis of application of BH heat-resistant polymer for high temperature reservoir.
HPAM polymers under the condition of high temperature occurred molecular degradation and hydrolytic degradation is the main mechanism of polymer chemical degradation, and it is also the main factor that affects and limits the HPAM polymer application in high temperature and high salinity reservoir, and accurately determining the hydrolysis degree is an important basis for polymer application【5,6】.
Therefore, this article propose to do a system study to the change law of hydrolysis degree of BH heat-resistant polymer, discuss the effect of high temperature hydrolysis on the properties of BH heat-resistant polymer solution, and provides the basis of application of BH heat-resistant polymer for high temperature reservoir.
Online since: September 2020
Authors: You Yang, Wei Feng Tang
Nitrogen, as an austenite-forming element instead of Ni, contributes to the improvement of mechanic properties by solid solution strengthening [3, 4].
Degallaix et al. [8] researched the effect of nitrogen additions on the fatigue properties of AISI 316 (0.03-0.25N) and 21Cr-4Mn-9.5Ni-(0.34-0.39N) steels.
In the whole curve, the room temperature fatigue properties of the as-forged alloy are generally higher than that of the solid solution alloy.
The distance between striations varies with the amplitude of stress intensity factor.
Vogt, Fatigue properties of high nitrogen steels.
Degallaix et al. [8] researched the effect of nitrogen additions on the fatigue properties of AISI 316 (0.03-0.25N) and 21Cr-4Mn-9.5Ni-(0.34-0.39N) steels.
In the whole curve, the room temperature fatigue properties of the as-forged alloy are generally higher than that of the solid solution alloy.
The distance between striations varies with the amplitude of stress intensity factor.
Vogt, Fatigue properties of high nitrogen steels.
Online since: October 2016
Authors: Sebastian Mróz, Piotr Szota, Andrzej Stefanik, Teresa Bajor
In recent years, many surface treatment methods have been developed and applied to improve surface properties magnesium and its alloys [2].
The mechanical tests of the joint were performed on a Zwick Z100 testing machine.
Mola, The properties of Mg protected by Al- and Al/Zn-enriched layers containing intermetallic phases, J.
Hanada, Fabrication of pure Al/Mg–Li alloy clad plate and its mechanical properties, J.
Chin, Microstructure and properties of magnesium AZ31B-aluminum 7075 explosively welded composite plate, Mat.
The mechanical tests of the joint were performed on a Zwick Z100 testing machine.
Mola, The properties of Mg protected by Al- and Al/Zn-enriched layers containing intermetallic phases, J.
Hanada, Fabrication of pure Al/Mg–Li alloy clad plate and its mechanical properties, J.
Chin, Microstructure and properties of magnesium AZ31B-aluminum 7075 explosively welded composite plate, Mat.
Online since: May 2022
Authors: S.M.M. Hadavi, Nasim Nayebpashaee
Temperature is one of the most important parameters affecting the stability of nanofluids.
Viscosity is the main factor for momentum transfer between fluid layers.
Based on their study, thermal conductivity is strongly dependent on temperature, particle size, volumetric concentration of particles, particle properties and base fluid properties.
The experiments show that the thermophysical properties of the hybrid nanofluids are strongly affected by the concentration of nanoparticles and temperature, especially at sub-zero temperatures. 2.
Sousa, Hybrid nanofluids preparation, thermal properties, heat transfer and friction factor – A review, Renew.
Viscosity is the main factor for momentum transfer between fluid layers.
Based on their study, thermal conductivity is strongly dependent on temperature, particle size, volumetric concentration of particles, particle properties and base fluid properties.
The experiments show that the thermophysical properties of the hybrid nanofluids are strongly affected by the concentration of nanoparticles and temperature, especially at sub-zero temperatures. 2.
Sousa, Hybrid nanofluids preparation, thermal properties, heat transfer and friction factor – A review, Renew.
Online since: September 2012
Authors: Sylvia Gebhardt, Andreas Schönecker, Dörthe Ernst, Bernhard Bramlage, Markus Flössel
PZT thick film material properties are also influenced by the choice of electrode material.
For comparison of material properties single PZT plates of the same material have been characterized as reference samples.
Dielectric properties as well as polarization status are much lower than that of the single PZT components.
First, mechanical clamping of PZT disc by the surrounding LTCC material may cause changes of low signal and high signal properties of LPM.
The clamping of the mirror is a crucial factor since it affects strongly deformation and resonance frequency of the system.
For comparison of material properties single PZT plates of the same material have been characterized as reference samples.
Dielectric properties as well as polarization status are much lower than that of the single PZT components.
First, mechanical clamping of PZT disc by the surrounding LTCC material may cause changes of low signal and high signal properties of LPM.
The clamping of the mirror is a crucial factor since it affects strongly deformation and resonance frequency of the system.
Online since: August 2006
Authors: S. Kakunai, H. Hayashihara, T. Sakamoto, H. Matsuda
Matsuda4
1
Department of Mechanical and System Engineering, University of Hyogo, 2167 Shosha, Himeji,
Hyogo, Japan, kakunai@eng.u-hyogo.ac.jp
2
Toshiba R&D Center, Toshiba Corp, Komukai Toshiba-cho, Saiwai-ku, Kawasaki,
Kanagawa, Japan, hiromichi.hayashihara@toshiba.co.jp
3
Department of Mechanical and System Engineering, University of Hyogo, 2167 Shosha, Himeji,
Hyogo, Japan, sakamoto@eng.u-hyogo.ac.jp
4 Department of Material Science and Chemistry, University of Hyogo, 2167 Shosha, Himeji, Hyogo,
Japan, matsuda@eng.u-hyogo.ac.jp
Keywords: Television Holography, Internal Stress, In-situ Measurement, Electroless Cu Plating
Solution, Cantilever Beam.
However, the internal stress generated in the plated film during deposition becomes an important factor for the detachment of the thin film from the substrate.
It was found that the internal stress changed greatly in the early stages of the plating and the additive greatly affected the initial internal stress.
The angle between the reference light and object light affects the measurement accuracy because the resolution of the CCD camera is far lower than that of a conventional holographic plate.
The properties of the substrate material are shown in Table 1.
However, the internal stress generated in the plated film during deposition becomes an important factor for the detachment of the thin film from the substrate.
It was found that the internal stress changed greatly in the early stages of the plating and the additive greatly affected the initial internal stress.
The angle between the reference light and object light affects the measurement accuracy because the resolution of the CCD camera is far lower than that of a conventional holographic plate.
The properties of the substrate material are shown in Table 1.
Online since: May 2004
Authors: Z. Ikonić, J. Radovanović, D. Indjin, V. Milanović
It relies on applying the tools of supersymmetric quantum
mechanical (SUSYQM) transform, followed by coordinate transform method and includes the
effects of large internal electrostatic fields characteristic of nitride heterostructures.
These fields originate from piezoelectric and spontaneous polarization and have a very significant influence on electronic and optical properties of the structure.
Clearly, both nonlinear effects exist only in asymmetric structures (where generally 012 � or 031 �µ ) and their intensities are proportional to factors 12 2 12 )0( µ=� and 312312 )2( µµµ=� .
Evidently, SUSYQM transform produces Hamiltonians with constant effective mass and variable potential, because the variation of parameter � affects only the potential while leaving the mass intact.
In III-N compounds there exists a strong internal electric field originating from piezoelectric and spontaneous polarization [13-15], which can be as large as few MV/cm and has a considerable influence on electronic and optical properties of the structure.
These fields originate from piezoelectric and spontaneous polarization and have a very significant influence on electronic and optical properties of the structure.
Clearly, both nonlinear effects exist only in asymmetric structures (where generally 012 � or 031 �µ ) and their intensities are proportional to factors 12 2 12 )0( µ=� and 312312 )2( µµµ=� .
Evidently, SUSYQM transform produces Hamiltonians with constant effective mass and variable potential, because the variation of parameter � affects only the potential while leaving the mass intact.
In III-N compounds there exists a strong internal electric field originating from piezoelectric and spontaneous polarization [13-15], which can be as large as few MV/cm and has a considerable influence on electronic and optical properties of the structure.
Online since: October 2014
Authors: Cheng Tung Chong, Simone Hochgreb
Spray Characteristics of an Internal-mix Airblast Atomizer
Cheng Tung Chong1,a*, Simone Hochgreb2,b
1 Faculty of Mechanical Engineering, Universiti Teknologi Malaysia 81310 Skudai, Johor, Malaysia.
2 Department of Engineering, University of Cambridge, Trumpington Street, CB2 1PZ Cambridge, UK
actchong@mail.fkm.utm.my, bsimone.hochgreb@eng.cam.ac.uk
Keywords: airblast, twin-fluid, atomizer, non-reacting spray, PDA
Abstract.
The effect of geometry [7] and liquid properties [8-11] on the spray qualities of airblast atomizers have been studied to elucidate the primary factors involved in atomization.
Gullberg and Marklund [19] reported that fuel and geometrical properties are among the parameters that can affect spray characteristics, in a spray study using an external twin-fluid atomizer with pyrolysis oil.
Despite improved understanding of the breakup of a liquid jet by a high-speed turbulent gas jet, there is little experimental data suitable for validation regarding the spatial distribution of droplet size and velocity within the spray as a function of spray geometry and fuel properties.
The properties of the diesel fuel is reported in [1].
The effect of geometry [7] and liquid properties [8-11] on the spray qualities of airblast atomizers have been studied to elucidate the primary factors involved in atomization.
Gullberg and Marklund [19] reported that fuel and geometrical properties are among the parameters that can affect spray characteristics, in a spray study using an external twin-fluid atomizer with pyrolysis oil.
Despite improved understanding of the breakup of a liquid jet by a high-speed turbulent gas jet, there is little experimental data suitable for validation regarding the spatial distribution of droplet size and velocity within the spray as a function of spray geometry and fuel properties.
The properties of the diesel fuel is reported in [1].
Online since: May 2009
Authors: Kanhaiya Lal Yadav
Yadav
Smart Materials Research Laboratory
Department of Physics, Indian Institute of Technology Roorkee,
Roorkee-247667, India
Email: klyadav35@yahoo.com
Keywords: Ceramics, nanocomposites, X-ray diffraction, dielectric properties, magnetic
properties
Abstract.
The physical properties of a material that are formed from two or more singlephase compounds are determined by the properties of the constituents as well as by the interaction between them.
Magnetic properties Fig. 8 shows magnetization vs. magnetic field (M-H) hysteresis loops for the composition x = 0.2 of CFBF composite annealed at different temperatures.
This indicates that coercivity not only depend on crystallite size but some other factors also affect the coercivity, otherwise coercivity would not have decreased on further increase in annealing temperature.
Magnetoelectric properties The variation of αE=dE/dH with HBias at various magnetic frequencies is shown in Fig. 15 and Fig. 16 for CFBF and NCFBF nanocomposites, respectively.
The physical properties of a material that are formed from two or more singlephase compounds are determined by the properties of the constituents as well as by the interaction between them.
Magnetic properties Fig. 8 shows magnetization vs. magnetic field (M-H) hysteresis loops for the composition x = 0.2 of CFBF composite annealed at different temperatures.
This indicates that coercivity not only depend on crystallite size but some other factors also affect the coercivity, otherwise coercivity would not have decreased on further increase in annealing temperature.
Magnetoelectric properties The variation of αE=dE/dH with HBias at various magnetic frequencies is shown in Fig. 15 and Fig. 16 for CFBF and NCFBF nanocomposites, respectively.
Online since: February 2016
Authors: Y.V. Gomeniuk, Valeriya N. Kudina, Vladimir Lysenko, Nikolay Garbar, Yevgenij Ye. Melnichuk, Yurii N. Kozyrev, Sergey Kondratenko
Besides states of the Ge NCs, the interface levels between SiOx/Si and Ge/SiOx, with x ≤ 2, play a crucial role in transport properties of Ge-NC/SiOx/Si heterostructures.
The band formation was ascribed to the presence of Ge NCs on silicon oxide surface affecting the energy structure in lateral and transversal direction.
Saf’yanov, Photoluminescence and transport properties of multilayer InAs/GaAs structures with quantum dots, Semiconductors, 33 (1999), 318-322
Efros, Electronic Properties of Doped Semiconductors (Springer, Berlin, 1984)
Stern, Electronic properties of two-dimensional systems, Rev.
The band formation was ascribed to the presence of Ge NCs on silicon oxide surface affecting the energy structure in lateral and transversal direction.
Saf’yanov, Photoluminescence and transport properties of multilayer InAs/GaAs structures with quantum dots, Semiconductors, 33 (1999), 318-322
Efros, Electronic Properties of Doped Semiconductors (Springer, Berlin, 1984)
Stern, Electronic properties of two-dimensional systems, Rev.