Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: December 2022
Authors: Mutia Reza, Adela Clara Synthia, Dwi Aprilia Kartikasari, Abdul Halim, Inggit Kresna Maharsih, Lusi Ernawati
The equilibrium adsorption data were fitted to the linear equation of Langmuir model (Eq. 4) and Freundlich model (Eq. 5) which are respectively expressed as follows:[37]
Ceqe=1qmKL+Ceqm (4)
lnln qe =lnln KF +1nlnln Ce (5)
where Ce is the equilibrium concentration of adsorbate (mg/L), qe is the amount of adsorbate adsorbed (mg/g), KL is the Langmuir adsorption constant (L/mg), qm is the maximum amount of adsorbate per unit weight of adsorbent (mg/g), KF is the Freundlich adsorption constant (mg/g (L/mg)1/n), n is a dimensionless constant that represents the adsorption intensity related to the surface heterogeneity.
3.
These data indicate that activating agents developed an additional porosity, especially microporosity, in the carbon studied.
The capacity adsorption of BB and EY followed second order kinetics and the equilibrium data of adsorption was in good agreement with Freundlich's isotherm, for each activating agents are H3PO4, NaCl and KOH respectively.
Bouallagui, Reduction of adsorbed dyes content in the discharged sludge coming from an industrial textile wastewater treatment plant using aerobic activated sludge process, J.
Data Collect. 28 (2020). https://doi.org/10.1016/j.cdc.2020.100426
These data indicate that activating agents developed an additional porosity, especially microporosity, in the carbon studied.
The capacity adsorption of BB and EY followed second order kinetics and the equilibrium data of adsorption was in good agreement with Freundlich's isotherm, for each activating agents are H3PO4, NaCl and KOH respectively.
Bouallagui, Reduction of adsorbed dyes content in the discharged sludge coming from an industrial textile wastewater treatment plant using aerobic activated sludge process, J.
Data Collect. 28 (2020). https://doi.org/10.1016/j.cdc.2020.100426
Online since: March 2011
Authors: Michael Uhrmacher
In [4] it was demonstrated with the help of a large data-set that the simulation of experimental EFGs in most cases already has converged, when the adding of ion-charges stops at 50 Angstroms distance.
The data have been recorded at a measuring temperature of 973 K.
The red line in the perturbation function is the fit to the data, the red line in the Fourier spectrum is the Fourier-transform of this fit-function.
But also the stoichiometry may change in a phase transition, as it happens during oxidation- or reduction-reactions.
The data show 111In/111Cd-probes in Ag2O [20].
The data have been recorded at a measuring temperature of 973 K.
The red line in the perturbation function is the fit to the data, the red line in the Fourier spectrum is the Fourier-transform of this fit-function.
But also the stoichiometry may change in a phase transition, as it happens during oxidation- or reduction-reactions.
The data show 111In/111Cd-probes in Ag2O [20].
Online since: July 2015
Authors: Sergiy V. Divinski
A direct comparison of the two data sets is not possible since the different
tracer atoms (Au in Ref. [39] and Ni in Ref. [40]) were used and the measurements were performed
in different regimes of interface diffusion.
In our recent work [24] we have argued that it is the diffusion coefficient of relaxed high-angle GBs, as they are present in well-annealed high purity polycrystalline Ni, which has to be used in order to obtain the data that fit to the experimental observations of the relaxation times of ECAP-processed UFG Ni.
It was shown that rolling to 80% and 90% of total reduction of Ni at room temperature does not induce deformationmodified state of GBs similar to that in observed in ECAP-processed Ni.
Since recrystallization is accompanied by GB recovery, GB diffusion coefficients on the level of those measured in annealed coarse-grained polycrystals were expected, in obvious contradiction to the experimental data.
A recent compilation of the published data on the diffusional GB width in polycrystalline materials is given in Ref. [56].
In our recent work [24] we have argued that it is the diffusion coefficient of relaxed high-angle GBs, as they are present in well-annealed high purity polycrystalline Ni, which has to be used in order to obtain the data that fit to the experimental observations of the relaxation times of ECAP-processed UFG Ni.
It was shown that rolling to 80% and 90% of total reduction of Ni at room temperature does not induce deformationmodified state of GBs similar to that in observed in ECAP-processed Ni.
Since recrystallization is accompanied by GB recovery, GB diffusion coefficients on the level of those measured in annealed coarse-grained polycrystals were expected, in obvious contradiction to the experimental data.
A recent compilation of the published data on the diffusional GB width in polycrystalline materials is given in Ref. [56].
Online since: July 2021
Authors: Muhsin Jaber Jweeg, S.H. Bakhy, S.E. Sadiq
Material of core and face
Dimension of specimen (mm)
Thickness of face sheet (mm)
Height of core height (mm)
Height of specimen(mm)
1
Al
300 x 300
0.5
10
11
2
Al
300 x 300
0.5
15
16
3
Al
300 x 300
0.5
20
21
4
Al
300 x 300
0.5
25
26
Experimental setup
In this test, an instrumented hammer, ADXL335 accelerometer, data acquisition Ni-6009 and PC are used.
LABVIEW software and SIGVIEW program are installed in PC to capture and save data of model analysis [51].
The signals from the accelerometer and the hammer are transferred to a PC by data acquisition NI-6009 interfaced with LABVIWE software.
Response Surface Method Based on the fact that design parameters play an important role in determent of the vibration characteristic of honeycomb sandwich structure, response surface method (RSM) was employed to study the influence of the design parameters on natural frequency and damping ratio, obtaining optimal parameter and develop a mathematical model based on numerical data.
The increasing of face thickness from (0.3 to 1) mm leads to increase in the natural frequency 39.34 % but causes a reduction of damping ratio by about 26 % for specific value of core height and cell angle equal to 10 mm and 200 respectively. 4.
LABVIEW software and SIGVIEW program are installed in PC to capture and save data of model analysis [51].
The signals from the accelerometer and the hammer are transferred to a PC by data acquisition NI-6009 interfaced with LABVIWE software.
Response Surface Method Based on the fact that design parameters play an important role in determent of the vibration characteristic of honeycomb sandwich structure, response surface method (RSM) was employed to study the influence of the design parameters on natural frequency and damping ratio, obtaining optimal parameter and develop a mathematical model based on numerical data.
The increasing of face thickness from (0.3 to 1) mm leads to increase in the natural frequency 39.34 % but causes a reduction of damping ratio by about 26 % for specific value of core height and cell angle equal to 10 mm and 200 respectively. 4.
Online since: November 2017
Authors: Baseem Khan, Pawan Singh
In 1971, the Ethiopian National Meteorological Services Agency (NMSA) started to collect the wind data from 39 different locations.
On the basis of the collected wind data from the existing wind measurement stations, two important points are concluded [11]: · There is considerable potential of wind energy generation in Ethiopia · Due to different topographies in Ethiopia, the generation of wind energy varies considerably for different locations.
There has been an incredible reduction in the cost of solar PV modules.
There are different advantages of DERs over centralized grid system, such as power loss reduction, scaled design and appropriateness to use renewable resources.
ICTs play a significant role in the success of DERs as they help in distant announcement of maintenance, recuperation, effortless data analysis and smart metering.
On the basis of the collected wind data from the existing wind measurement stations, two important points are concluded [11]: · There is considerable potential of wind energy generation in Ethiopia · Due to different topographies in Ethiopia, the generation of wind energy varies considerably for different locations.
There has been an incredible reduction in the cost of solar PV modules.
There are different advantages of DERs over centralized grid system, such as power loss reduction, scaled design and appropriateness to use renewable resources.
ICTs play a significant role in the success of DERs as they help in distant announcement of maintenance, recuperation, effortless data analysis and smart metering.
Online since: December 2012
Authors: Ming Xing Zhang, Qiang Wang
Experimental data show that the efficiency of these dynamic parameters may be raised if we take care of some effects (boundary layer along the nozzle walls and a local high-pressure region) that occur when the gas-powder mixture moves in the supersonic nozzle and when the jet impinges on the substrate.
However, the velocity reduction within the elliptical flow is relatively small, at a maximum of roughly 20 m/s.
Fig. 8 CFD data, showing contours of density, for the bow shock at different standoff distances when using the helium nozzle at 2.0 MPa and 20 °C. [32] Pattison et al [32] studied the behavior of bow shock by using computational fluid dynamics (CFD), particle image velocimetry and schlieren imaging.
Gartner et al [25] consider mechanical and thermal influences, and a comparatively modified simple expression for the critical velocity for bonding (in a system of identical particle and substrate materials) could be supplied (in SI units), giving a good estimate for favorable spray conditions: (12) Respective data concerns tensile strength (σTS), density (ρ), specific heat (cp) and melting temperature (Tm).
The high velocities attained in converging-diverging, De Laval type nozzles of recent HVOF designs allowed a further reduction of particle temperatures.
However, the velocity reduction within the elliptical flow is relatively small, at a maximum of roughly 20 m/s.
Fig. 8 CFD data, showing contours of density, for the bow shock at different standoff distances when using the helium nozzle at 2.0 MPa and 20 °C. [32] Pattison et al [32] studied the behavior of bow shock by using computational fluid dynamics (CFD), particle image velocimetry and schlieren imaging.
Gartner et al [25] consider mechanical and thermal influences, and a comparatively modified simple expression for the critical velocity for bonding (in a system of identical particle and substrate materials) could be supplied (in SI units), giving a good estimate for favorable spray conditions: (12) Respective data concerns tensile strength (σTS), density (ρ), specific heat (cp) and melting temperature (Tm).
The high velocities attained in converging-diverging, De Laval type nozzles of recent HVOF designs allowed a further reduction of particle temperatures.
Online since: March 2021
Authors: Tamba Jamiru, Oluwagbenga Adesina, Emmanuel Olorundaisi, Olanrewaju Seun Adesina, Rotimi Sadiku, Olugbenga Ogunbiyi
This leads to a significant reduction in the number of production stages and increased material yield by producing a near-net-shape product [5].
The relative density was measured 8 times to ensure data accuracy and the average was taken as the actual relative density value.
The data obtained was further simplified by using X’pert High Score Plus software.
Furthermore, the test was repeated eight times to ensure data accuracy whilst the arithmetic mean of the eight successive indentations was taken as the actual hardness value.
The pores were further quantified, and the data obtained was discussed with respect to the relative density, microhardness and predicted yield strength properties for the sintered alloys in section 3.7.
The relative density was measured 8 times to ensure data accuracy and the average was taken as the actual relative density value.
The data obtained was further simplified by using X’pert High Score Plus software.
Furthermore, the test was repeated eight times to ensure data accuracy whilst the arithmetic mean of the eight successive indentations was taken as the actual hardness value.
The pores were further quantified, and the data obtained was discussed with respect to the relative density, microhardness and predicted yield strength properties for the sintered alloys in section 3.7.
Online since: December 2024
Authors: Minyahil Tanashu, Amare Kassaw, Seifu Admasu, Noam Ezra, Teng Long, Lara Allen, Elizabeth M. Tennyson, Sam Stranks, Tassew Tadiwos, Tefera Terefe
Introduction
Renewable power generation costs, particularly from solar and wind, have decreased significantly over the past 13-15 years, making them cost-competitive with fossil fuels in many regions, and a reduction of 89 % to $0.04/kWh was observed in the global average cost of electricity generated by solar PV [1].
Description of the Study Area The study was conducted in the Ethiopian Amhara region, at the town of Dangishta as shown in the Fig. 1a and the climate data of the site is depicted in Fig. 1b, with yearly average energy of 2334.3 kWh/m2.
Location of Dangisehta (a) and Climate Data (b).
From the local market a KF200P-24 solar PV panel with a maximum power output of 200 W, maximum power voltage (Vmp) of 36.9 V, and maximum power current (Imp) of 5.42 A has been used for testing the system at atilt angle of 12o of southeast orientation based on the site data.
Draft manuscript preparation, data collection, analysis and interpretation of results: Minyahil Tanashu; and other authors reviewed and edited the final version of the manuscript.
Description of the Study Area The study was conducted in the Ethiopian Amhara region, at the town of Dangishta as shown in the Fig. 1a and the climate data of the site is depicted in Fig. 1b, with yearly average energy of 2334.3 kWh/m2.
Location of Dangisehta (a) and Climate Data (b).
From the local market a KF200P-24 solar PV panel with a maximum power output of 200 W, maximum power voltage (Vmp) of 36.9 V, and maximum power current (Imp) of 5.42 A has been used for testing the system at atilt angle of 12o of southeast orientation based on the site data.
Draft manuscript preparation, data collection, analysis and interpretation of results: Minyahil Tanashu; and other authors reviewed and edited the final version of the manuscript.
Online since: March 2008
Authors: Robert J. Falster, Vladimir V. Voronkov
The precipitation of oxygen in
silicon wafers without MDZ control is a very complex mixture of effects mixing together both the
10
12
1013
10
6
10
7
10
8
10
9
1010
1011
Measurement
Fit using Data between 108 and 1010
cm-3
[OPD] ≈ ([Pt] / 2.19 1010)
3.838
Oxygen Precipitation Density (cm
-3
)
Vacancy Concentration (cm
-3
)
Figure 2: Oxygen precipitate densities produced following test heat-treatments (800 °C,
4 hours + 1000C 16 hours) as a function of wafer vacancy concentration.
This can then be further broken down using data from vacancy profile analysis.
With an essential reduction in CIs, the bulk vacancy concentration can increase significantly.
Other important features of the data are the very strong dependence of the rate of increase of the density of observable particles on the final saturated density and on the oxygen concentration.
The unknown parameters of this dependence can be deduced from the available data on the platelet production (obtained by TEM) as well as on the onset of gettering.
This can then be further broken down using data from vacancy profile analysis.
With an essential reduction in CIs, the bulk vacancy concentration can increase significantly.
Other important features of the data are the very strong dependence of the rate of increase of the density of observable particles on the final saturated density and on the oxygen concentration.
The unknown parameters of this dependence can be deduced from the available data on the platelet production (obtained by TEM) as well as on the onset of gettering.