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Online since: May 2020
Authors: Volodymyr Bochka, Artem Sova, Oleksandr Hryshyn, Alisa Dvoiehlazova, Lina Kieush
The inequality of the change in the capillary impregnation height for each composition of the blend can be explained by the number of factors, namely, the instability of the surface properties of the materials within the composite, the change in the effective radius of the capillary, and others.
The influence of the mineralogical composition of bonds on the sinter strength properties with different basicity.
The influence of fine particles of binding materials on the strength properties of hardening backfill.
The study of the mechanical properties of the main components of iron ore sinter.
Effect of adding limestone on the metallurgical properties of iron ore pellets.
The influence of the mineralogical composition of bonds on the sinter strength properties with different basicity.
The influence of fine particles of binding materials on the strength properties of hardening backfill.
The study of the mechanical properties of the main components of iron ore sinter.
Effect of adding limestone on the metallurgical properties of iron ore pellets.
Online since: November 2005
Authors: Akira Todoroki, Takaomi Inada
Cure monitoring of composite
structures is crucial for quality control and improvement of mechanical properties of structures.
Most use change of dielectric properties to estimate viscosity change of epoxy resin.
For example, the dissipation factor of dielectric properties is often used to measure resin viscosity and to determine the gel point [1-3].
Kim et al. compared dissipation factors from dielectric properties with the degree of cure from differential scanning calorimetry (DSC) data; they derived the relationship between the dissipation factor and the degree of cure [4].
However, conventional cure monitoring methods using sensors may reduce mechanical properties of the structure owing to embedded sensors.
Most use change of dielectric properties to estimate viscosity change of epoxy resin.
For example, the dissipation factor of dielectric properties is often used to measure resin viscosity and to determine the gel point [1-3].
Kim et al. compared dissipation factors from dielectric properties with the degree of cure from differential scanning calorimetry (DSC) data; they derived the relationship between the dissipation factor and the degree of cure [4].
However, conventional cure monitoring methods using sensors may reduce mechanical properties of the structure owing to embedded sensors.
Online since: September 2016
Authors: I.Y. Potoroko, A.A. Ruskina
This article assesses factors that affect merchandising and consumer performance of semi-prepared potato products and also deals with the issues of developing technologies and comprehensive assessment of the quality of the latter.
Polyphenol oxidase activity causes melanins buildup – these dark colored substances impair the outer look and other properties of the products [6].
Apart from oxidative enzymes, the potatoes darkening process is affected by respiration of the tubers.
Mechanical and other types of damage increase this rate.
As variable factors the power of ultrasonic influence (W) and time of influence (min.) have been chosen.
Polyphenol oxidase activity causes melanins buildup – these dark colored substances impair the outer look and other properties of the products [6].
Apart from oxidative enzymes, the potatoes darkening process is affected by respiration of the tubers.
Mechanical and other types of damage increase this rate.
As variable factors the power of ultrasonic influence (W) and time of influence (min.) have been chosen.
Online since: February 2013
Authors: Wei Wei, Yi Li, Mao De Li
The heat will not only deteriorate its components (electrodes, current collector, separator film etc.) resulting in its capacity fading and life shrinking, but also affect vehicle performance and cycle life of HEV in the automotive field.
In this article, the author analyzes battery heat generation and its influence factors, establishes heat transfer model and carries out numerical computation based on experimental data of battery properties.
Physical Property Parameters Battery internal resistance will not be a constant during charging or discharging when its internal temperature and capacity vary.
In the process of solving the thermal model, specific heat affects the accuracy of experimental results.
Analysis of the reason may be the other properties of the batteries would also change with temperature and SOC.
In this article, the author analyzes battery heat generation and its influence factors, establishes heat transfer model and carries out numerical computation based on experimental data of battery properties.
Physical Property Parameters Battery internal resistance will not be a constant during charging or discharging when its internal temperature and capacity vary.
In the process of solving the thermal model, specific heat affects the accuracy of experimental results.
Analysis of the reason may be the other properties of the batteries would also change with temperature and SOC.
Online since: January 2009
Authors: Chao Yin Nie, Xiao Kui Liu, Hisashi Watanabe
These two shortcomings have affected its actual application as
tribological coatings in the above fields.
Moreover, the relationships between lubricating properties on the condition of ambient air and engine oil and the microstructure, the morphologies, as well as interface characteristics of the coatings were analyzed respectively. 2.
Based on the reasons discussed above, the microhardness of Ti-DLC coating depends mainly on two factors.
The interacting of the two factors lead to the variation tendency of the microhardness in the present study, that is when Ti concentration is lower than 3at.%, When Ti concentration is lower than 3at.%, the first factor plays a major role, the coating hardness decreases significantly。
In terms of the adhesion strength, the internal stress is a main influencing factor.
Moreover, the relationships between lubricating properties on the condition of ambient air and engine oil and the microstructure, the morphologies, as well as interface characteristics of the coatings were analyzed respectively. 2.
Based on the reasons discussed above, the microhardness of Ti-DLC coating depends mainly on two factors.
The interacting of the two factors lead to the variation tendency of the microhardness in the present study, that is when Ti concentration is lower than 3at.%, When Ti concentration is lower than 3at.%, the first factor plays a major role, the coating hardness decreases significantly。
In terms of the adhesion strength, the internal stress is a main influencing factor.
Online since: June 2016
Authors: W.M. Paiva Barbosa de Lima, V.S. Silva, A.G. Barbosa de Lima, João M.P.Q. Delgado
Drying process can be affected by internal and external conditions of the process which affect moisture migration and heat transfer mechanisms into the material.
Mathematical Modeling To model the drying process of clay solids with arbitrary shape, the following considerations were adopted: (a) The ceramic solid is homogeneous and isotropic; (b) The distribution of moisture and temperature inside the solid are uniform during the process; (c) Thermo-physical properties are constant during the transient process; (d) The drying phenomenon occurs by heat and mass diffusion within the solid and mass and heat convection and evaporation, at the surface thereof.
The area/volume relationships of material is a factor that offers big influence in the drying process.
e) The surperficial area of the product that is exposed to drying and volume of the solid are important factors in drying.
Dissertation (Masters in Mechanical Engineering), Federal University of Santa Catarina, Santa Catarina, 2004.
Mathematical Modeling To model the drying process of clay solids with arbitrary shape, the following considerations were adopted: (a) The ceramic solid is homogeneous and isotropic; (b) The distribution of moisture and temperature inside the solid are uniform during the process; (c) Thermo-physical properties are constant during the transient process; (d) The drying phenomenon occurs by heat and mass diffusion within the solid and mass and heat convection and evaporation, at the surface thereof.
The area/volume relationships of material is a factor that offers big influence in the drying process.
e) The surperficial area of the product that is exposed to drying and volume of the solid are important factors in drying.
Dissertation (Masters in Mechanical Engineering), Federal University of Santa Catarina, Santa Catarina, 2004.
Online since: June 2012
Authors: Xue Ming Yang, Dong Ci Chen
In this regard, the formation of carbon nanotube junctions which has amazing electronic properties are a key issue and is still not fully understood.
These techniques proposed include electron beam irradiation or ion irradiation, mechanical manipulation with atomic force microscope, nanotube soldering, chemical functionalization, and heat welding.
Despite the progress made thus far, both the mechanics of the bond formation of the junction and the dominant factors in the heating-welding process have not been well studied yet.
There are many factors that affect the bond formation of the junction during the heating welding process, including the elevated temperature, wall-to-wall distance of the two crossed SWCNTs, chirality of the two crossed SWCNTs and the annealing time.
Defects distribution will also affect the heat welding process of the SWCNTs.
These techniques proposed include electron beam irradiation or ion irradiation, mechanical manipulation with atomic force microscope, nanotube soldering, chemical functionalization, and heat welding.
Despite the progress made thus far, both the mechanics of the bond formation of the junction and the dominant factors in the heating-welding process have not been well studied yet.
There are many factors that affect the bond formation of the junction during the heating welding process, including the elevated temperature, wall-to-wall distance of the two crossed SWCNTs, chirality of the two crossed SWCNTs and the annealing time.
Defects distribution will also affect the heat welding process of the SWCNTs.
Online since: February 2013
Authors: Li Ning Wu, Yong Tao Shen, Jian Hua Zhang, Zong Qi Liu, Jie Ji, Meng Si Tan
Short-term Wind Speed Forecasting Based on Time Series-State Transition Method
Jie Ji 1, a, Yongtao Shen 2, b, Mengsi Tan 3, c, Lining Wu4, Jianhua Zhang5, Zongqi Liu6
1, 2, 3, 5, 6Transmission and Distribution System Research Institute, 4School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, China
aglossary@126.com, bsyt19880927@163.com, ctanmengsi1990@163.com
Keywords: wind speed forecasting; error; time series; state transition; time series-state transition
Abstract: Wind speed forecasting is of great significance to the improvement of grid stability and the reduction of operating cost.
Reference [1] utilizes Persistence Method to predict wind speed, whereas the accuracy is relatively low; reference [2] uses Kalman Filtering Method, which is on the assumption that the statistical properties of noises are the same.
Simultaneously, the state transition model can achieve the division of any single data types, without considering its affecting factors.
Among large numbers of history wind speed data which is influenced by various factors, there are also some abnormal data.
Reference [1] utilizes Persistence Method to predict wind speed, whereas the accuracy is relatively low; reference [2] uses Kalman Filtering Method, which is on the assumption that the statistical properties of noises are the same.
Simultaneously, the state transition model can achieve the division of any single data types, without considering its affecting factors.
Among large numbers of history wind speed data which is influenced by various factors, there are also some abnormal data.
Online since: August 2013
Authors: Aminuddin Saat, Mohsin M. Sies, Ahmed G. Dairobi, Ali Abuelnuor Abdeen Abuelnuor, Mazlan Abdul Wahid, Seyed Ehsan Hosseini, M. Kabashi Elbasheer, H.A. Mohammed, A.N. Darus
All these factors lead to lower NOX emission [23].
Wahid, Abuelnuor, A.A.A, High temperature air combustion: Sustainable technology to low NOX formation, International Review of Mechanical Engineering, vol.
Khalil, Assessment of numerical computation of flow-properties in an axi-symmetric reversed flow furnace, Applied Mathematical Modelling, vol. 3, pp. 25-31, 1979
Blasiak, Numerical simulation of properties of a LPG flame with high-temperature air, International journal of thermal sciences, vol. 44, pp. 973-985, Oct 2005
Yang, Magnus M¨ortberg and Wlodzimierz Blmaasiak, Influences of flame configurations on flame properties and NO emissions in combustion with high-temperature air, Scandinavian Journal of Metallurgy, vol. 34, pp. 7-15, Feb 2005
Wahid, Abuelnuor, A.A.A, High temperature air combustion: Sustainable technology to low NOX formation, International Review of Mechanical Engineering, vol.
Khalil, Assessment of numerical computation of flow-properties in an axi-symmetric reversed flow furnace, Applied Mathematical Modelling, vol. 3, pp. 25-31, 1979
Blasiak, Numerical simulation of properties of a LPG flame with high-temperature air, International journal of thermal sciences, vol. 44, pp. 973-985, Oct 2005
Yang, Magnus M¨ortberg and Wlodzimierz Blmaasiak, Influences of flame configurations on flame properties and NO emissions in combustion with high-temperature air, Scandinavian Journal of Metallurgy, vol. 34, pp. 7-15, Feb 2005
Online since: August 2019
Authors: Pavla Rovnaníková, Patrik Bayer, Martin Vyšvařil
The aim of this study is to compare some physico-mechanical and microstructural properties of lava sand mortars with reference mortars with pure quartz sand.
Any detailed study of the properties of lime mortar with lightweight volcanic aggregate has not been published yet.
The use of lava sand resulted in slightly improved mechanical properties of the mortars despite the higher amount of mixing water required for the same fresh mortar consistency.
Summary This paper has focused on the effect of lava sand on the mechanical properties, microstructure and frost resistance of lime mortars.
Improving the properties of mortars using lava sand is a good prerequisite for its use in practice; increased porosity of mortars is a positive factor for high ability to salt accumulation from masonry and enhanced water permeability in mortars.
Any detailed study of the properties of lime mortar with lightweight volcanic aggregate has not been published yet.
The use of lava sand resulted in slightly improved mechanical properties of the mortars despite the higher amount of mixing water required for the same fresh mortar consistency.
Summary This paper has focused on the effect of lava sand on the mechanical properties, microstructure and frost resistance of lime mortars.
Improving the properties of mortars using lava sand is a good prerequisite for its use in practice; increased porosity of mortars is a positive factor for high ability to salt accumulation from masonry and enhanced water permeability in mortars.