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Online since: January 2013
Authors: Emmanuel Iwuoha, Chinwe O. Ikpo, Njagi Njomo, Kenneth I. Ozoemena, Tesfaye Waryo, Rasaq A. Olowu, Milua Masikini, Abd Almonam Baleg, Nazeem Jahed, Priscilla G.L. Baker
FeCo nanoparticles are important soft magnetic materials with a variety of structural [18-20], electronic [21-22], mechanical [23-24], optical [21] and electro-catalytic properties [25].
Rodriguez, Physical and chemical properties of bimetallic surfaces, Surf.
Greneche, Structural properties of Fe50Co50 nanostructured powder prepared by mechanical alloying, J.
Dinhut, Mechanical and magnetic properties of nanocrystalline FeCo alloys produced by mechanical alloying, Nanostruct.
Sourmail, Near equiatomic FeCo alloys: constitution, mechanical and magnetic properties, Prog.
Rodriguez, Physical and chemical properties of bimetallic surfaces, Surf.
Greneche, Structural properties of Fe50Co50 nanostructured powder prepared by mechanical alloying, J.
Dinhut, Mechanical and magnetic properties of nanocrystalline FeCo alloys produced by mechanical alloying, Nanostruct.
Sourmail, Near equiatomic FeCo alloys: constitution, mechanical and magnetic properties, Prog.
Online since: May 2011
Authors: Zhong Min Zhao, Liang Xiang Liu, Long Zhang, Xue Gang Huang, Tao Ma
The results of properties indicate that with increasing mass fraction of B4C+Ti+C in combustion systems, the relative density and fracture toughness of TiB2-TiC composites are all among 97%~99% and 6.5~7.1 MPa·m1/2, respectively, and the Vickers hardness and flexural strength are increased gradually to the maximum values of 28.6GPa and 615MPa, respectively.
The high processing temperatures adversely affect the microstructure due to grain growth and also lead to high production costs.
The dependences of relative density and mechanical properties of TiB2-TiC composite ceramics on the content of (B4C+Ti+C) were shown in Fig. 7, respectively.
In terms of the literature [3], the key factor controlling the densification process of TiB2-TiC is the liquid phase formed in the products.
The hardness of the ceramics is dependent on the elastic modulus of the ceramics at room temperature, whereas the elastic modulus of the ceramics is a function of the elastic properties of the phases and their respective volume fractions [6].
The high processing temperatures adversely affect the microstructure due to grain growth and also lead to high production costs.
The dependences of relative density and mechanical properties of TiB2-TiC composite ceramics on the content of (B4C+Ti+C) were shown in Fig. 7, respectively.
In terms of the literature [3], the key factor controlling the densification process of TiB2-TiC is the liquid phase formed in the products.
The hardness of the ceramics is dependent on the elastic modulus of the ceramics at room temperature, whereas the elastic modulus of the ceramics is a function of the elastic properties of the phases and their respective volume fractions [6].
Online since: May 2020
Authors: Fang Po Li
Once one surface galling failure case presents, dozens or even hundreds of RSTC always galling failure at the same time, which seriously affect drilling operation.
Based on numbers of galling drill pipes testing result, it’s found that chemical composition, mechanical properties, geometrical size and thread parameters of RSTC always met the requirement of API Spec 7-2:2008 and API Spec 5DP:2009 [2] standards.
Considering service environment and operation condition, it was concluded that the mainly related factors with surface galling damage included make-up torque, surface wear, thread compound, rearranging and tensile load.
In order to analyze the influence of these factors on surface galling damage of RSTC, full-scale experiments simulating field service condition were carried out in this paper.
The testing results showed that 60%~80% yield torque couldn’t resulted in serious damage or galling failure under the condition that thread parameters, geometry and material properties of RSTC and thread compound met the requirement of relevant standards.
Based on numbers of galling drill pipes testing result, it’s found that chemical composition, mechanical properties, geometrical size and thread parameters of RSTC always met the requirement of API Spec 7-2:2008 and API Spec 5DP:2009 [2] standards.
Considering service environment and operation condition, it was concluded that the mainly related factors with surface galling damage included make-up torque, surface wear, thread compound, rearranging and tensile load.
In order to analyze the influence of these factors on surface galling damage of RSTC, full-scale experiments simulating field service condition were carried out in this paper.
The testing results showed that 60%~80% yield torque couldn’t resulted in serious damage or galling failure under the condition that thread parameters, geometry and material properties of RSTC and thread compound met the requirement of relevant standards.
Online since: September 2013
Authors: Qiu Ling Chen, Qiu Ping Chen, Hui Wang
Introduction
Due to its unique Magneto-Optical (MO) property, the MO fiber based sensors are very interesting to many applications related to Faraday Effect such as magneto-optical current transformers (MOCT) [1-2] which provides numerous advantages over the conventional transformers, such as contactless, small volume and cost efficient etc.
The fiber used in this study is telluride TZN fiber, thanks to their perfect thermal stability, good optical properties at infrared wavelengths and high magneto-optical property caused by high polarizability of Te4+ ions [9], the TZN fiber is good candidate for MOCT applications.
When the linearly polarized light propagates through the fiber, the birefringence will be induced for mechanical stresses, imperfection of fiber etc.
Careful alignment was carried out to eliminate the alterations in the polarization due to external factors.
During the measurement, there existed many factors which affect the accuracy.
The fiber used in this study is telluride TZN fiber, thanks to their perfect thermal stability, good optical properties at infrared wavelengths and high magneto-optical property caused by high polarizability of Te4+ ions [9], the TZN fiber is good candidate for MOCT applications.
When the linearly polarized light propagates through the fiber, the birefringence will be induced for mechanical stresses, imperfection of fiber etc.
Careful alignment was carried out to eliminate the alterations in the polarization due to external factors.
During the measurement, there existed many factors which affect the accuracy.
Online since: September 2019
Authors: Phuong Nguyen Ngoc, Vo Tuyen, Minh Kha Ho, Thanh Nam Nguyen
The inlet’s geometry is always the core factor that directly affects hydrodynamics and separation efficiency of the cyclone separation types.
Although they have potential applications, the complex phenomenon affecting the separating efficiency have not been studied completely in the past [3, 6-8].
Movafaghian et al [13] researched the effects of geometry, fluid properties and pressure on the hydrodynamics of GLCC with one and two inlets.
This will affect the performance of the separator.
Movafaghian et al, The effects of geometry, fluid properties and pressure on the hydrodynamics of gas-liquid cylindrical cyclone separators, International Journal of Multiphase Flow 26 (2000) 999-1018
Although they have potential applications, the complex phenomenon affecting the separating efficiency have not been studied completely in the past [3, 6-8].
Movafaghian et al [13] researched the effects of geometry, fluid properties and pressure on the hydrodynamics of GLCC with one and two inlets.
This will affect the performance of the separator.
Movafaghian et al, The effects of geometry, fluid properties and pressure on the hydrodynamics of gas-liquid cylindrical cyclone separators, International Journal of Multiphase Flow 26 (2000) 999-1018
Online since: June 2007
Authors: Guo Dong Wang, Zheng Yi Jiang, Xiao Ming Zhang, L.M. Yang, Xianghua Liu
China
2
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong,
Wollongong NSW 2522, Australia
a
zhang_xiaoming@263.net, bjiang@uow.edu.au, cly356@uow.edu.au, dliuxh@mail.neu.edu.cn,
e
wanggd@mail.neu.edu.cn
Keywords: Twin-roll strip casting, Flow, Temperature, Outlet angle, Submerged nozzle depth.
In twin-roll strip casting process, metal flow and temperature distribution in the molten pool directly affect the stability of the process and the quality of products.
But the protective slag cannot keep warm in twin-roll strip casting, the submerged nozzle depth is a very important factor.
Stainless steel was selected as the casting material and the relevant properties of stainless steel were mentioned in reference [16].
In twin-roll strip casting process, metal flow and temperature distribution in the molten pool directly affect the stability of the process and the quality of products.
But the protective slag cannot keep warm in twin-roll strip casting, the submerged nozzle depth is a very important factor.
Stainless steel was selected as the casting material and the relevant properties of stainless steel were mentioned in reference [16].
Online since: August 2008
Authors: Chung Shin Chang, Albert Wen Jeng Hsue, Lih Ren Hwang
The heat partition factors between the tip and chip are
solved by using the inverse heat transfer analysis, which utilizes temperature on the carbide tip's
surface measured by infrared as the input.
Fortunately, the temperature and cutting speed affected on BUE formation are relatively well defined, and can be controlled.
Sreejith et al. [16] showed the wide difference in thermal properties of the fiber and matrix material and also the relatively poor thermal conductivity of composites make it rather difficult to adopt any of the unconventional technique for machining the polymeric composites.
Table 2 shows some of the physical and mechanical properties of GFRP prior to carrying out the cutting experiments.
This model can be extended to on-line control domain in addition to the factors of time and thermal effect.
Fortunately, the temperature and cutting speed affected on BUE formation are relatively well defined, and can be controlled.
Sreejith et al. [16] showed the wide difference in thermal properties of the fiber and matrix material and also the relatively poor thermal conductivity of composites make it rather difficult to adopt any of the unconventional technique for machining the polymeric composites.
Table 2 shows some of the physical and mechanical properties of GFRP prior to carrying out the cutting experiments.
This model can be extended to on-line control domain in addition to the factors of time and thermal effect.
Online since: July 2015
Authors: Z. Turgut, H. Kosai, A. Sheets, T. Bixel, A. Wheatley, P. Abdulkin, B. Knappett, M. Matusiewicz, Gregory Kozlowski, David Jefferson, V. Chaudhary, J. Kasperczyk, M. Makowska-Janusik
Due to the unique size and different physical, chemical, thermal and mechanical properties magnetic nanoparticles are widely used as agents for drug delivery to target tissues, tissue repair, cell labelling, magnetic resonance imaging, and tumor hyperthermia [2].
This is a quantum mechanical exchange interaction.
Surface Effects The magnetic properties will change when the bulk size material is reduced to nanometer scale.
The temperature probe used should have a high degree of precision, accuracy and almost instantaneous response without affecting the medium whose temperature is being measured.
Koch, “Magnetic Nanoparticles: Properties and Potential Applications”, Pure Appl.
This is a quantum mechanical exchange interaction.
Surface Effects The magnetic properties will change when the bulk size material is reduced to nanometer scale.
The temperature probe used should have a high degree of precision, accuracy and almost instantaneous response without affecting the medium whose temperature is being measured.
Koch, “Magnetic Nanoparticles: Properties and Potential Applications”, Pure Appl.
Online since: October 2004
Authors: Xia Ting Feng, An Nan Jiang, Jian Liu, Zong Liang Ru
Feedback Analyses of Initial Ground Stress Field and Rock Mechanics Parameters
Initial stress field and rock mechanics parameters directly affect the stress distribution, deformation
evolution of the surrounding rock masses after excavation, and they are the important factors that
must be considered in the design and optimization of support systems.
Generally, there are many uncertain factors before excavation, so the real-time feedback of the results to the next construction steps is very necessary.
The comparison of the numerical results and the in-situ monitor data demonstrated that the group of high physical properties agrees with the realistic rock mass parameters, which is shown in Table 1.The comparison between resulted from numerical modeling and in-situ monitoring accumulative displacements of some cross-sections at the third construction step is shown in Table 2.
Mechanical parameters of surrounding rock mass resulted from the feedback analyses Density Deformation Poisson's Friction Cohesion Tensile Strata (kN/m 3 ) Modulus(GPa) ratio Angle (°) (MPa) Strength(MPa) P1q4 26 20.0 0.25 45 1.2 1.5 P1q3 26 8.0 0.35 38 0.8 1.0 P1q2 26 20.0 0.25 45 1.2 1.5 P1q1 26 8.0 0.35 38 0.8 1.0 P1ma 20 0.8 0.40 30 0.4 0.7 C2h 26 18.0 0.28 52 1.2 1.5 Concrete 25 26.0 0.167 45 1.5 2.0 Table 2 The comparison between resulted from numerical modeling and in situ monitoring accumulative displacements of some cross-sections at the third construction step((((Unit::::mm)))) No.1Set No.2 Set No.3 Set No.4 Set Monitoring data of settlement displacements of arc top -2.0 -2.2 -2.9 -4.5 Numerical result of settlement displacements of arc top -2.435 -2.583 -2.762 -3.575 Monitoring data of convergent displacements of arc shoulder -3.0 -2.1 -3.0 -4.1 Numerical result of convergent displacements of arc shoulder -2.269 -1.846 -1.9 -5.19
The high physical properties adopted by the numerical model also agree with the factual rock mass.
Generally, there are many uncertain factors before excavation, so the real-time feedback of the results to the next construction steps is very necessary.
The comparison of the numerical results and the in-situ monitor data demonstrated that the group of high physical properties agrees with the realistic rock mass parameters, which is shown in Table 1.The comparison between resulted from numerical modeling and in-situ monitoring accumulative displacements of some cross-sections at the third construction step is shown in Table 2.
Mechanical parameters of surrounding rock mass resulted from the feedback analyses Density Deformation Poisson's Friction Cohesion Tensile Strata (kN/m 3 ) Modulus(GPa) ratio Angle (°) (MPa) Strength(MPa) P1q4 26 20.0 0.25 45 1.2 1.5 P1q3 26 8.0 0.35 38 0.8 1.0 P1q2 26 20.0 0.25 45 1.2 1.5 P1q1 26 8.0 0.35 38 0.8 1.0 P1ma 20 0.8 0.40 30 0.4 0.7 C2h 26 18.0 0.28 52 1.2 1.5 Concrete 25 26.0 0.167 45 1.5 2.0 Table 2 The comparison between resulted from numerical modeling and in situ monitoring accumulative displacements of some cross-sections at the third construction step((((Unit::::mm)))) No.1Set No.2 Set No.3 Set No.4 Set Monitoring data of settlement displacements of arc top -2.0 -2.2 -2.9 -4.5 Numerical result of settlement displacements of arc top -2.435 -2.583 -2.762 -3.575 Monitoring data of convergent displacements of arc shoulder -3.0 -2.1 -3.0 -4.1 Numerical result of convergent displacements of arc shoulder -2.269 -1.846 -1.9 -5.19
The high physical properties adopted by the numerical model also agree with the factual rock mass.
Online since: July 2021
Authors: Margaret A. Gradova, Oleg V. Gradov, Andrey Ivanovich Sergeev, Irina A. Maklakova, Yu.K. Naganovskiy
Thus, a transition to the phase level providing formation of colloidal systems with the given properties, engineering of both standard and synthetic genetic code carriers, becomes essentially a kind of material nanoprocessing.
The same factors which allow to control individual NA molecules (electron beam, laser radiation, thermal effect in thermal cycling) can be also used as the tools for material processing.
For the above purposes, it is necessary to perform the following measurements: a) design a system for the synthesis of nucleic acids with any specific properties and new bases introduced into the molecular structure of the biopolymers; b) thermogravymetric analysis of the extrusion processes or high-temperature processing, up to coking of the nucleic acids; c) examination of the original granulated sample surface and identification of partial anisotropy in it in order to predict its role in further sample processing; d) study of the charging of nucleic acid samples, as well as their derivatives, which affects their behavior under an electron / ion beam, as well as the manifestation of semiconductor or dielectric properties (the latter has also been shown for organo-inorganic DNA-containing coordination structures [147-150], which were expected to be used as an element base for new hybrid electronics); e) NMR control of water content, which will affect the quality of products, as well
Williams, Predicting mechanical property plateau in laser polymer powder bed fusion additive manufacturing via the critical coalescence ratio, Materials and Design (2021) 109474
Kadayifcilar, Electrical and intrface properties of Au/DNA/n-Si organic-on-inorganic structures, Microelectronic Engineering 86(11) (2009) 2305-2311
The same factors which allow to control individual NA molecules (electron beam, laser radiation, thermal effect in thermal cycling) can be also used as the tools for material processing.
For the above purposes, it is necessary to perform the following measurements: a) design a system for the synthesis of nucleic acids with any specific properties and new bases introduced into the molecular structure of the biopolymers; b) thermogravymetric analysis of the extrusion processes or high-temperature processing, up to coking of the nucleic acids; c) examination of the original granulated sample surface and identification of partial anisotropy in it in order to predict its role in further sample processing; d) study of the charging of nucleic acid samples, as well as their derivatives, which affects their behavior under an electron / ion beam, as well as the manifestation of semiconductor or dielectric properties (the latter has also been shown for organo-inorganic DNA-containing coordination structures [147-150], which were expected to be used as an element base for new hybrid electronics); e) NMR control of water content, which will affect the quality of products, as well
Williams, Predicting mechanical property plateau in laser polymer powder bed fusion additive manufacturing via the critical coalescence ratio, Materials and Design (2021) 109474
Kadayifcilar, Electrical and intrface properties of Au/DNA/n-Si organic-on-inorganic structures, Microelectronic Engineering 86(11) (2009) 2305-2311