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Online since: April 2016
Authors: Sung Hoon Kim, Jae Kyung Lee
Bunch-type large-sized (100 ~ 200 mm in diameter) Ni grains were used as the catalyst for the formation of the carbon coils.
They also confirmed the formation of the geometrically controlled carbon coils by the gas phase composition cycling on/off modulation numbers [12].
Indeed, we could observe a few numbers of L-CMCs on the surface of the substrate.
They also confirmed the formation of the geometrically controlled carbon coils by the gas phase composition cycling on/off modulation numbers [12].
Indeed, we could observe a few numbers of L-CMCs on the surface of the substrate.
Online since: February 2024
Authors: Ali Altway, Siti Nurkhamidah, Halomoan Halomoan
It means the effect of the number of seeds used on the average crystal size produced has similarities with the results obtained with research study that have been carried out, namely a greater number of seeds used in the crystallization process causes the growth rate crystals become slower.
Then the mother liquor concentration is adjusted so that during the crystallization process, the crystals are not dissolved in the mother liquor and new nuclei (false grains) are not formed.
The third factor is the number of sugar seeds used, which consists of four levels (3 m3, 5 m3, 10 m3, and 15 m3).
Effect of Number of Seeds on Linear Growth Velocity at the Level of Total Molasses 5 m3 This is the same as explained by Bennar et al. (2012), the use of seed volume must be limited because a large seed volume contains a large number of seeds, too many seeds can cause sugar crystal growth to not be optimal to reach the desired size [10].
Effect of Total Molasses on Massecuite Purity at the level of the number of sugar seeds 5 m3 Molasses contains impurities that can cause different crystal shapes.
Then the mother liquor concentration is adjusted so that during the crystallization process, the crystals are not dissolved in the mother liquor and new nuclei (false grains) are not formed.
The third factor is the number of sugar seeds used, which consists of four levels (3 m3, 5 m3, 10 m3, and 15 m3).
Effect of Number of Seeds on Linear Growth Velocity at the Level of Total Molasses 5 m3 This is the same as explained by Bennar et al. (2012), the use of seed volume must be limited because a large seed volume contains a large number of seeds, too many seeds can cause sugar crystal growth to not be optimal to reach the desired size [10].
Effect of Total Molasses on Massecuite Purity at the level of the number of sugar seeds 5 m3 Molasses contains impurities that can cause different crystal shapes.
Online since: May 2012
Authors: Ji Shan Yang
With the implementation of“Grain for Green Project” from 1980s in mountain areas of China, many fast-growing plantations were planted for increasing tree coverage.
Shannon-wiener index is adopted to evaluate the diversity of the herb layer: (2) Where is community diversity; is number of individuals of theth-species; is total number of individuals of all kinds.
The value increases with an increased number of species in a community, and it usually falls between 1.5 and 3.5 and rarely surpasses 4[14].
The general trend of the herb species number is that it decrease under the Acacia mearnsii and Leucaena leucocephala plantations, but increase under the plantations of Eucalyptus spp. and Pinus yunnanensis with the increase of tree age and canopy coverage.
The distribution of herb species under plantations of Pinus yunnanensis become more evenly, and this can be shown by the increase of the Shannon-wiener index, which reaches a relatively high number of 2.6 under the 20 years old ones(Figure 3).
Shannon-wiener index is adopted to evaluate the diversity of the herb layer: (2) Where is community diversity; is number of individuals of theth-species; is total number of individuals of all kinds.
The value increases with an increased number of species in a community, and it usually falls between 1.5 and 3.5 and rarely surpasses 4[14].
The general trend of the herb species number is that it decrease under the Acacia mearnsii and Leucaena leucocephala plantations, but increase under the plantations of Eucalyptus spp. and Pinus yunnanensis with the increase of tree age and canopy coverage.
The distribution of herb species under plantations of Pinus yunnanensis become more evenly, and this can be shown by the increase of the Shannon-wiener index, which reaches a relatively high number of 2.6 under the 20 years old ones(Figure 3).
Online since: December 2014
Authors: Jian Tong Zhang, Dong Feng Li
Researchers had used different methods to model asphalt mixture individual strain components including mechanical elements such as Burger-type and Maxwell-type elements; power law functions of stress, time, and number of load repetitions; and Perzyna’s theory of viscoplasticity.
Specially, aggregate shape and angularity were found to be amongst the most important parameters that affect asphalt performance, as they have a strong influence on the way grains make contact and interlock.
In this model the asphalt mixture specimen is reconstructed with a given number of aggregates coated with asphalt cement.
The number of viscoelastic elements for a given specimen depends on the number of asphalt-coated aggregate contacts.
The DSC can be implemented in two and three dimensional finite-element procedures, which provide unique and novel approaches for pavement engineering and allow static, repetitive, and dynamic loads including elastic, plastic, creep, microcracking leading to fracture and failure [30, 31]. 3 Summary and Conclusion In this study, many microstructure-based computational methods, which had done by a number of researchers, for predicting micromechanical behavior of asphalt mixtures are presented.
Specially, aggregate shape and angularity were found to be amongst the most important parameters that affect asphalt performance, as they have a strong influence on the way grains make contact and interlock.
In this model the asphalt mixture specimen is reconstructed with a given number of aggregates coated with asphalt cement.
The number of viscoelastic elements for a given specimen depends on the number of asphalt-coated aggregate contacts.
The DSC can be implemented in two and three dimensional finite-element procedures, which provide unique and novel approaches for pavement engineering and allow static, repetitive, and dynamic loads including elastic, plastic, creep, microcracking leading to fracture and failure [30, 31]. 3 Summary and Conclusion In this study, many microstructure-based computational methods, which had done by a number of researchers, for predicting micromechanical behavior of asphalt mixtures are presented.
Online since: May 2016
Authors: Shuji Sakaguchi
ISO has more than 200 technical committees, and they are numbered in the order of the establishment.
The latest number of TC is TC296.
The total number of publication is 81.
Figure 1 shows the number of published ISO standards from TC206 by year.
monolithic ceramics at elevated temperatures ISO 18558: Test method for determining elastic modulus and bending strength of ceramic tube and rings ISO 18756: Determination of fracture toughness of monolithic ceramics at room temperature by the surface crack in flexure (SCF) method ISO 20501: Weibull statistics for strength data ISO 20808: Determination of friction and wear characteristics of monolithic ceramics by ball-on-disk method ISO 22214: Test method for cyclic bending fatigue of monolithic ceramics at room temperature ISO 22215: Test method for tensile creep of monolithic ceramics ISO 23146: Test methods for determination of fracture toughness of monolithic ceramics – Single edge vee-notch beam (SEVNB) method ISO 24370: Test method for fracture toughness of monolithic ceramics at room temperature by chevron notched beam (CNB) method WG7: Monolithic ceramics/ Physical and thermal properties (7 items) ISO 13383-1: Microstructural characterisation - Part 1: Determination of Grain
The latest number of TC is TC296.
The total number of publication is 81.
Figure 1 shows the number of published ISO standards from TC206 by year.
monolithic ceramics at elevated temperatures ISO 18558: Test method for determining elastic modulus and bending strength of ceramic tube and rings ISO 18756: Determination of fracture toughness of monolithic ceramics at room temperature by the surface crack in flexure (SCF) method ISO 20501: Weibull statistics for strength data ISO 20808: Determination of friction and wear characteristics of monolithic ceramics by ball-on-disk method ISO 22214: Test method for cyclic bending fatigue of monolithic ceramics at room temperature ISO 22215: Test method for tensile creep of monolithic ceramics ISO 23146: Test methods for determination of fracture toughness of monolithic ceramics – Single edge vee-notch beam (SEVNB) method ISO 24370: Test method for fracture toughness of monolithic ceramics at room temperature by chevron notched beam (CNB) method WG7: Monolithic ceramics/ Physical and thermal properties (7 items) ISO 13383-1: Microstructural characterisation - Part 1: Determination of Grain
Online since: April 2019
Authors: Shahrom Mahmud, Naser Mahmoud Ahmed, Dauda Abubakar
The wet oxidation sample of NiO nanoparticle forms a grains diameter of about 25 – 34 nm with no pores (Fig 4a).
[AOH2+], [AOH] and AO- are the numbers of these sites per surface area.
Based on the well-known theory of site binding, the binding sites number residing on the sensing membrane could result to surface potential voltage changes between the electrolyte and the sensing layer interface which depend on pH at point of zero charge (pHpzc).
Based on the site binding model mentioned above, the surface potential voltage of NiO thin film between the sensing layer and the electrolytic pH solution interface can be expressed as [14]; . ψ=2.303kTqββ+1(pHpzc-pH) (8) where pHpzc= -log10(KAKB)12 is the pH value at the zero charge point of the sensing membrane, β=2q2NS(KBKA)12kTCDL is the sensitivity parameter, which depend on the density of surface hydroxyl groups and reflects the chemical sensitivity of the gate insulator, NS is the total number of surface sites per unit area, and KA and KB are acid and base equilibrium constants, respectively.
The sensitivity of dry oxidation based NiO membrane (54 mV/pH) was found to be relatively higher than that of wet oxidation based NiO membrane (48 mV/pH) due to the high crystallinity and surface to volume ratio properties of dry oxidation based NiO Nanostructured thin films, which provided higher number of sites and increased the number of exchangeable ions with the [H+] available in the electrolyte.
[AOH2+], [AOH] and AO- are the numbers of these sites per surface area.
Based on the well-known theory of site binding, the binding sites number residing on the sensing membrane could result to surface potential voltage changes between the electrolyte and the sensing layer interface which depend on pH at point of zero charge (pHpzc).
Based on the site binding model mentioned above, the surface potential voltage of NiO thin film between the sensing layer and the electrolytic pH solution interface can be expressed as [14]; . ψ=2.303kTqββ+1(pHpzc-pH) (8) where pHpzc= -log10(KAKB)12 is the pH value at the zero charge point of the sensing membrane, β=2q2NS(KBKA)12kTCDL is the sensitivity parameter, which depend on the density of surface hydroxyl groups and reflects the chemical sensitivity of the gate insulator, NS is the total number of surface sites per unit area, and KA and KB are acid and base equilibrium constants, respectively.
The sensitivity of dry oxidation based NiO membrane (54 mV/pH) was found to be relatively higher than that of wet oxidation based NiO membrane (48 mV/pH) due to the high crystallinity and surface to volume ratio properties of dry oxidation based NiO Nanostructured thin films, which provided higher number of sites and increased the number of exchangeable ions with the [H+] available in the electrolyte.
Online since: December 2024
Authors: Oksana Melnikova, Valentina Iurchenko, Natalia Teliura
Suction of sewage liquid in a number of studies was excluded by hanging concrete samples in nets on the arch.
We have identified a number of water insoluble, but extractable into solution by organic solvents (lipid-like) compounds, in the products of microbiological corrosion of concrete (Fig. 2).
The formation of phospholipids and the role of this metabolite in adsorption of bacterial cells on mineral grains, dissolution of sulfur and protection of bacteria from toxicants were reported in studies of T.ferroxidans [21].
Among the organic substances formed by microbiocenoses on the arch part of collectors: phospholipids, as well as phthalic acid esters, alkanes (paraffins) with the number of carbon atoms in the molecule up to C36, alcohols, aromatic compounds. 4.
Methods for determination of acid number (ISO 660:1996, NEQ).
We have identified a number of water insoluble, but extractable into solution by organic solvents (lipid-like) compounds, in the products of microbiological corrosion of concrete (Fig. 2).
The formation of phospholipids and the role of this metabolite in adsorption of bacterial cells on mineral grains, dissolution of sulfur and protection of bacteria from toxicants were reported in studies of T.ferroxidans [21].
Among the organic substances formed by microbiocenoses on the arch part of collectors: phospholipids, as well as phthalic acid esters, alkanes (paraffins) with the number of carbon atoms in the molecule up to C36, alcohols, aromatic compounds. 4.
Methods for determination of acid number (ISO 660:1996, NEQ).
Online since: February 2014
Authors: Ding Guo Huang, Xing Wu Hou, Hang Zheng Li, Hai Feng Chen, Xuan Peng
China has a long history of coal mining; there are a large number of discarded mines owing to resource extinct so far.
Namely, after overlying roof rock stratum caving itself directly, broken rock layers fill up the gob and gradually close-grained with the basic roof slowly sinking, thereby forming a bottom to up caving zone, fractured zone and bending zone.
In addition, a large number of abandoned underground laneways and chambers retain considerable volume.
For abandoned mine storing CO2, there are large numbers of geological exploration work in the process of mines exploration and production, and accumulate rich geological data.
(3)The relatively closed of each field can form a number of independent storage areas in a mining area, which is beneficial for the flexible management of CO2 storage and reduces the risk of large-scale sequestration
Namely, after overlying roof rock stratum caving itself directly, broken rock layers fill up the gob and gradually close-grained with the basic roof slowly sinking, thereby forming a bottom to up caving zone, fractured zone and bending zone.
In addition, a large number of abandoned underground laneways and chambers retain considerable volume.
For abandoned mine storing CO2, there are large numbers of geological exploration work in the process of mines exploration and production, and accumulate rich geological data.
(3)The relatively closed of each field can form a number of independent storage areas in a mining area, which is beneficial for the flexible management of CO2 storage and reduces the risk of large-scale sequestration
Online since: October 2018
Authors: Alexander D. Razmyshlyaev, Elena V. Lavrova, Marina V. Ahieieva
Such magnetic characteristics of the indicated bodies as B(H) and m(H) depend on the chemical composition of alloys based on iron, microstructure and grain sizes and they are not linear.
A magnetizing winding with a number of turns W1 and a measuring winding with a number of turns W2 were wound on the researched sample, which had the form of a torus.
Windings W1 and W2 are made of copper insulated wire with a diameter of 0.3...0.5 mm, the number of turns was W1 = 150…350; W2 = 75.
If we take a torus with an average diameter dav with a slot of width b (Fig. 3a) and place a winding uniformly on it with the total number of turns W and flow through it a constant current I, then the magnetic permeability in the slot is equal to B.
The windings were reeled (uniformly) from copper insulated wires 1.2 mm in diameter with a number of turns W = 50.
A magnetizing winding with a number of turns W1 and a measuring winding with a number of turns W2 were wound on the researched sample, which had the form of a torus.
Windings W1 and W2 are made of copper insulated wire with a diameter of 0.3...0.5 mm, the number of turns was W1 = 150…350; W2 = 75.
If we take a torus with an average diameter dav with a slot of width b (Fig. 3a) and place a winding uniformly on it with the total number of turns W and flow through it a constant current I, then the magnetic permeability in the slot is equal to B.
The windings were reeled (uniformly) from copper insulated wires 1.2 mm in diameter with a number of turns W = 50.
Online since: January 2012
Authors: Hui Ping Ren, Zhong Hui Hou, Dong Liang Zhao, Yang Huan Zhang, Bao Wei Li, Zai Guang Pang
It is very evident that the as-cast alloys exhibit a typical dendrite structure, and the substitution incurs the notable refinement of the grains of the as-cast alloys.
The evolution of the Rn values of the as-spun (25 m/s) alloys with the cycle number is described in Fig. 4.
The activation capability was characterized by the number of charge-discharge required for attaining the greatest discharge capacity through a charge-discharge cycle at a constant current density.
Fig. 6 presents the cycle number dependence of the discharge capacities of the as-spun (25 m/s) alloys.
It is Fig. 6 Evolution of the discharge capacity of the as-spun (25 m/s) alloys with the cycle number: (a) M=Cu, (b) M=Co Fig. 7 Evolution of the maximum discharge capacity of the as-spun (25 m/s) alloys with M content evident that the HRD values of the as-spun (25 m/s) alloys visibly grow with rising M (M=Cu, Co) content.
The evolution of the Rn values of the as-spun (25 m/s) alloys with the cycle number is described in Fig. 4.
The activation capability was characterized by the number of charge-discharge required for attaining the greatest discharge capacity through a charge-discharge cycle at a constant current density.
Fig. 6 presents the cycle number dependence of the discharge capacities of the as-spun (25 m/s) alloys.
It is Fig. 6 Evolution of the discharge capacity of the as-spun (25 m/s) alloys with the cycle number: (a) M=Cu, (b) M=Co Fig. 7 Evolution of the maximum discharge capacity of the as-spun (25 m/s) alloys with M content evident that the HRD values of the as-spun (25 m/s) alloys visibly grow with rising M (M=Cu, Co) content.