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Online since: May 2022
Authors: Adeyinka Sikiru Yusuff, Lekan Taofeek Popoola, Abel Adekanmi Adeyi, Aloysius Akaangee Pam, Adebayo Tajudeen Ogunyemi, Mellisa Chinazom Uzoukwu, Esther Bernard, Abubakar Hamisu
Experimental data seem good with all tested models, and best with the Redlich-Peterson model.
The linear pseudo-first-order and pseudo-second-order kinetic models were applied for the analysis of kinetic data.
In evaluating the kinetic parameters for metal uptake by AICFB, the two models were tested to analyze the experimental data.
The nonlinear curve fittings of the three models (Fig. 7), and Table 2 revealed that the data could be fitted into all the models well with greater than 0.99.
Equilibrium isotherm data were fitted using Langmuir, Freundlich and Redlich-Peterson (three parameters) models, and data were well described by all.
Online since: July 2005
Authors: Jean Michel Sprauel, H. Michaud, F. Galzy
This constraint, coupled with the requirement of lightening imposed by the reduction of fuel consumption, forces to increase the characteristics of resistance to fatigue of materials, in particular of forged steels [1].
To evaluate and correct all geometrical aberrations a complete modelling of the measurement we therefore developed. 17 ΨΨΨΨ incidences 29,3°< ΨΨΨΨ<+29.3° Inclination 35° Crankpin Fillet with mask Collimating slit // fillet 0.25x3mm 17 ΨΨΨΨ incidences 29,3°< ΨΨΨΨ<+29.3° Inclination 35° Crankpin Fillet with mask Collimating slit // fillet 0.25x3mm Figure 5: X-ray experimental setup A mask O A' Shadowing effect Non irradiated area + reduction of intensity Under estimated stresses Fictive shear stresses Intensity Incidence Error for ψ=30° Shift of the Beam centre at A' X-ray beam for ψ=0° X-ray beam for ψ=30° A mask O A' Shadowing effect Non irradiated area + reduction of intensity Non irradiated area + reduction of intensity Under estimated stresses Fictive shear stresses IntensityIntensity Incidence Error for ψ=30° Shift of the Beam centre at A' X-ray beam for ψ=0° X-ray beam for ψ=30° Figure 6: Modelling of
To solve this problem a theoretical model was developed which permit to correct, as well as possible, the optical aberration existing in the acquired data.
Online since: March 2011
Authors: Karim Inal, Christian Rivero, Renaud Vayrette, Sylvain Blayac
Based on knowledge of microstructure, experimental data are compared to analytical models and the root mechanisms of residual stress generation are discussed.
Maximum crystallite size increases strongly with thickness reduction.
Moreover, the amplitude of the abnormal grain growth increases with the reduction of the film thickness.
All these remarks suggest that for 0.4 µm films, additional mechanisms of stress relaxation occur and enhance with the thickness reduction.
On the other hand, the abnormal grain growth minimizing strain energy and so the development of {100} fiber texture is promoted by film thickness reduction and annealing temperature increase.
Online since: August 2002
Authors: Mohamed Bououdina, Z. Xiao Guo
The use of hydrogen as a temporary alloying element can offer additional benefits to powder-based processing of Ti aluminides, such as enhanced powder refinement and milling efficiency, and reduction of oxygen contamination during milling and sintering.
Ti, TiH2 and Al, were first analysed by XRD and the data was refined using the Rietveld analysis.
The broader diffraction peaks of the free powder with reduction in the intensities may signal the on-set of amorphisation of the powder.
It is assumed that the grain size reduction effects result in Lorentzian peak broadening, whereas peak broadening due to the microstrain effects is Gaussian, as justified theoretically and experimentally [7, 8].
A volume contraction of - 5.8 % was obtained in comparison with pure Ti, which is associated with a reduction in the atomic radius, rAl=1.43 < rTi=1.45 Å and a negative volume of mixing.
Online since: December 2012
Authors: Yusong Pang, Gabriel Lodewijks, Dingena L. Schott
DIN 22101 [4] indicates that reducing the belt speed and thereby maximizing belt loads always lead to a certain reduction of the required electrical drive power.
However, an overall reduction of the required electrical power is expected due to the low belt speed.
Further, the conveyor drive and belt speed can be controlled by the alternation of drive frequency, towards the reduction of required electrical power.
In order to avoid unnecessary and harmful acceleration and deceleration of belt conveyors during extreme load (e.g.peak load), the material loading situation can be represented by analyzing the standardized mean values of measured data.
A., scenario indicates that the material flow is in lower part of range , compared to the scenario, so that the reduction of belt speed is required for maximum loading on the belt.
Online since: November 2012
Authors: Xin Zhang
Based on relevant data, annual consumption of standard coal in wood drying process is 11.55 million tons, this value accounts for 45% of the total energy consumption by timber enterprises in timber production, while the atmosphere environmental pollution caused by emissions produced in drying process can not be ignored, CO2 emission from drying 10000m3 of wood per hour is 1900 m3, SO2 is 45 m3, soot volume is 40kg, also including a number of nitric oxide, and these substances can lead to atmosphere environmental pollution.
Currently, to achieve reduction in the investment cost and energy consumption, hot water heating method has been added to such steam heating method, and this drying technology, after decades of development and with the increasingly sophistication and maturity, basically can meet wood drying of regular tree species and a variety of sizes, and in order to achieve a better drying result, development of high temperature drying technology is achieved in steam heating technology, so as to meet the drying requirements of soft hardwood and softwood lumber.
Especially since Professor Zhang Biguang at Beijing Forestry University developed High Temperature Dehumidify Dryer of Two Heat Sources for Wood Drying, the energy reduction performance in drying process has become more obvious; in addition, China's demand for fast-growing wood, hardly dried wood and hard broadleaf during industrial wood use course is increasing, and microwave heating technology and high-frequency drying technology have demonstrated small stress and deformation, small temperature gradient, uniform drying and other characteristics, so they show great advantages in the drying process of large-section woods, and the development prospect is also very impressive; the last is combined drying technology, its principle is to integrate a variety of drying technologies, absorb their merits, and make up for their shortcomings.
First, we can use steam heating means in the process of wood preheating to avoid shortcomings of high power consumption and slow heat increase existing in the dehumidification drying warm-up process; in medium drying stage, due to large amount of humidity, we can use dehumidification drying technology to recycle residual heat in the drying chamber, so energy saving can be achieved; in the latter stage of drying technology, due to reduction in the amount of humidity, we can then use steam drying way to effectively achieve the shortening of drying cycle, increase drying rate and increase the temperature of drying chamber.
Promote green drying, and further achieve energy conservation Because China's energy consumption has unreasonable structure and environmental pressure, energy saving and emission reduction will become a very important work in future economic development.
Online since: May 2020
Authors: Jin Hui Xu, Lin Wu, Ying Liu, Jia Ming Liu, Sha Sha Shu, Yu Xiao Yang, Xiang Kang, Ya Hu
As can be seen from the figure, the graphene-supported cerium oxide has obvious absorption peaks at 28.5o, 33.0o, 47.2o, 56.3o, 69.3o, 77.0o and the corresponding crystal planes are (111), (200), ( 220), (311), (400), and (331) respectively.The CeO2 on the graphene surface has the same crystal plane as the pure CeO2 particles, which is in good agreement with the diffraction data of the CeO2 cubic standard spectrum (JCPDS 34-0394),which proves that it has been successfully obtained CeO2 particles loaded on the surface of graphene.
However, the CeO2/rGO composite material in the figure didn’t show the absorption peak of graphene oxide, indicating that graphene oxide was successfully reduced during hydrothermal reduction.
Ma, Study on Microwave Reduction of Graphene Oxide and Its Electrochemical Capacitance Properties, Journal of Tarim University. 29 (2017)118-125
Qu, Research progress in the preparation of graphene by chemical reduction method, Western Leather. 2(2013) 29-33
Ma, Preparation of graphene oxide by electrochemical reduction of graphite oxide, Chem.
Online since: August 2016
Authors: Ahmed Abd El-Moneim, Engy Ghoniem
Another innovative method was reported by Gao et al, they used direct laser reduction and patterning of hydrated GO to fabricate micro-supercapacitors [7].
Fig. 1(a) shows the universal laser printing machine VLS 2.30; Universal Laser Systems, (Scottsdale, USA) that used in the reduction process.
Other, structural characterizations for the LRGO electrode that reported before, demonstrated that the high powered CO2 laser enables a significant reduction of GO supported on flexible PET substrate to high quality of LRGO in spite of minor contribution of the C=O (carboxylic), C-O (epoxy), and C-O (alkoxy) groups [16]–[18].
In order to understand the reason behind the unique performance of the interdigital in – plane supercapacitor I-PS(6), EIS data were collected to quantify their electronic and ionic conductivities, and diffusion.
Cheng, Direct reduction of graphene oxide films into highly conductive and flexible graphene films by hydrohalic acids, Carbon N.
Online since: March 2012
Authors: Hong Liang Xiang, Dong Liu, Jin Chun Fan, Pei Pei Guo
Each experiment was run at least three times, and the data always showed good reproducibility.
The reduction in Eb of specimens after antibacterial treatment suggested the increase of tendency to pitting corrosion sensitization, as shown in table 1.
With the increase of treated temperature, the particle size and/or volume fraction of copper-rich precipitates increase resulted in the reduction of pitting corrosion resistance.
Eventually resulted in the slight reduction of antibacterial effect.
Conclusions (1) The ε-Cu and other copper-rich precipitates led to the reduction of pitting resistance, and revealed a trend of gradual decrease with antibacterial treatment temperature increased.
Online since: August 2014
Authors: Jian Gao, Guang Zhou Liu, Xue Lei Liu, Shu Xu, Xin Liu
MEC’s EcoSilencer® system has been installed aboard on two ships who are owned by Icon Yachts and P&O FERRY company respectively[9,10].the system can achieve a 96% SO2 reduction with a 70-80% reduction in particulates (for sizes larger than 1 micron).
It can achieve a 98% SO2 reduction that exceeds MAPOL’s requirements.
As a exsample, the increased costs is calculated when MDO replaces HFO, according to the statistics data of the European association of classification society[18] , the price of HFO 380(633 USD/ton,3 S%) and MDO(905 USD/ton, 0.5 S%)[19].
As a kind of clean, efficient and cheap energy, LNG is a good choice to replace the traditional marine oil [20] .and LNG ship can achieve not only SOX emission standards, but also 80% NOX reduction.
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