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Online since: February 2009
Authors: O.O. Ojo
C = Acetic acid concentrations (moles/litre) X= Acetic acid adsorbed (moles) M X = Acetic acid adsorbed per unit weight of carbon (moles/gram) b = slope of a plot of C / ΣX/M against C N = Avogadro's number Introduction Activated carbons are now extensively used in water and waste water treatment process.
Their adsorptive capacities depend on the grain size [7].
Two grain sizes, 0.300 and 0.212mm are obtained from each sample and their adsorptive capacities were determined.
At a given temperature, there is a definite relationship between number of molecules adsorbed upon a surface and the pressure (if a gas) or the concentration (if a solution) which may be represented by an equation or graphically by a curve called adsorption isotherm.
Online since: June 2011
Authors: Hye Jin Lee, Jung Han Song, K.D. Park, Geun An Lee, H.W. Lee
Specification Description S/W DEFORM-3D Rolling speed 245mm/sec Shear friction factor(m) 0.9 Material AISI 410(SUS) Number of mesh / size 90000 / 0.03mm Analysis scope Cold Thread Rolling Thread Rolling Simulation Flat die thread rolling simulation consists of two parts.
Since the grain size effect of micro level is not considered in this work, mesh size effect using refined meshes is testified above all.
When the limited mesh size is set to 0.02mm with the elements number of 150,000, it is difficult to investigate parameter effects on deformed thread shape because the elapsed simulation time is over one month in a PC with single CPU at a rough estimate.
Vriesen, Investigation of work hardening of flat-rolled helical-involute gears through grain-flow analysis, FE-modeling, and strain signature, Int.
Online since: July 2006
Authors: Yan Wang, X.J. Zhou, De Jin Hu
They have been devised and applied successfully in precision surface grinding. [1,2] Traditional single diamond dresser wears out very quickly and the worn-out dresser cannot produce sufficient protrusion of the cutting grain edges[3-5].
The model number of diamond wheel used for truing and dressing is 1A1/T2 200×6×20×4 MBD3 120/140 M75.
The model number of diamond wheel is 1A1/T2 200×6×20×4 MBD3 120/140 M75.
The metal bond among diamond grains is removed.
Online since: August 2006
Authors: Roman Nowak, Erja Turunen, Jari Keskinen, Simo Pekka Hannula, Teppo Fält, Pertti Lintunen, Tom E. Gustafsson, Tommi Varis
Thermal spraying is a very complex process including a number of variables.
Powder Material code Manufacturer and method Grain size [µm] Crystal size Al-1110 ref-Al2O3 Praxair, fused and crushed 5-22 conven-ti onal Boehmite n-Al2O3 VTT, agglomerated and sintered 2-22 nano as "First order map" and "Second order map" [6].
Commercial Praxair Al-1110HP Al2O3 powder was used as a reference material having grain size in the micron range.
The hardness of the coatings was measured in Vickers hardness numbers at a load of 2.9 N.
Online since: October 2018
Authors: Dong Hui Yang, Si Yu Wei, Lei Wang, Chang Wei Yao
Under external loads, cracks always emerge with partly random location, numbers and degrees, making it difficult to be aware of the exact condition about materials in real time.
The total number of atoms is 5388988 and time step is set to be 0.005 ps.
Under high temperature, the diffusion capacity of atoms enhances, and atomic vacancies, grain boundary slip, internal atomic activities and distance increase.
In conventional metals at macro scale, high strain rate can result in superplasticity due to internal change of grains.
Online since: January 2018
Authors: Dominik Gazdič, Marcela Fridrichová, Karel Dvořák
On the other hand, high temperature accelerated the initial phase of the hydration process, but negatively affected the resulting mechanical parameters Introduction In the field of construction, there is a growing number of building activities in recent years.
This effect had two maximums at 750 °C and 780 °C, which corresponds to the decomposition of fine-grained and then coarse-grained calcium carbonate.
Acknowledgements This work was financially supported by project number GA 17-24954S “The Conditions of Thermodynamic Stability and Transformation of AFt Phases” and project No.
Online since: July 2014
Authors: R. Deepak Joel Johnson, G. Ugrasen
Introduction: The efficiency of grinding depends on the number of effective cutting edge on the grinding wheel.
Although mechanical dressing is an effective approach, it can also cause deep cracks and damage which may loosen grains causing the number of cutting edge to get reduced.
As the pulse duration increases the temperature also increases and it shows some damages on the grains when pulse duration increases.
Online since: September 2014
Authors: Hu Xiao
The mechanization of field operations and scientific planting, raising and marketing, has been realized with the implementing of ‘infrastructure construction of grain fields’, ‘demonstration project of high and new technology integration innovation for high yield rice’, ‘innovation project technology of food preservation’ and other modern agriculture construction of the projects.
Table 1 Domestic third-part certificates of Shanghai WANSHIFA products in 2012 Type Certificate number Certificate organization Certificated product Quantity (tons) Oganic product OP-3008-931-117 OFDC Product Certification Center Rice 2300 Organic food OF-3102-931-117 OFDC Product Certification Center Japonica rice 3502.8 Green food LB-03-0904091334A China Green Food Development Center Rice 22000   Source: Data from China Food and Agricultural Products Certification Information System, China Green Food Development Center, OFDC Product Certification Center, and Shanghai WANSHIFA Company published information.
The ‘hukou’ records which is traceable from planting, harvesting, delivery to the entire sales process of a grain of rice, is the debut appearance of ‘identity card’ for organic food.
As long as landing the homepage of Shanghai WANSHIFA (www.wanshifa.net ), logging into the organic rice archives query system and entering a 6 digit number, you can trace back the ‘previous and present life’ of the rice.
Online since: June 2022
Authors: Ilare Bordeasu, Lavinia Madalina Micu, Cornelia Laura Salcianu, Anton Hadar, Dumitru Viorel Bazavan, Daniela Alexa, Corneliu Eusebiu Podoleanu, Gabriel Mălaimare, Nicuşor Alin Sîrbu, Cristan Ghera, Sebastian Titus Duma, Liviu Daniel Pîrvulescu
Table 3 HV0.5 hardness Measurements number C 700/R 250 C 700/R 500 Ratio 148,8 146,1 Increase over the delivered state [%] @ 50 @ 48 The increase of hardness, shows the beneficial effect of the applied volumetric thermal heat treatments, which will be seen, below, in the degree of degradation, respectively in the value of the parameters for evaluating the resistance to cavitation. 3.
The degraded surface (fig.3b) by cavitation has cracks, caverns and gaps created by the expulsion of grains.
The SEM image of the eroded surface (fig. 3d) highlights the formation of irregularly shaped micro craters following the expulsion of precipitated secondary phase particles from the supersaturated solid solution β and the coalescence of the network of cracks developed mainly in the area between the grain boundaries. 4.
Rusen, Hybrid System that Integrates the Lost Energy Recovery on the Water-Water Heat Pump Exhaust Circuit, IOP Conference Series: Materials Science and Engineering, 4th World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium, WMCAUS 2019, Prague, 17 - 21 June 2019, Volume 603, Issue 418 September 2019, Article number 042002
Online since: June 2008
Authors: D.C. Foley, R.E. Barber, J.T. Im, B. Onipede, K.T. Hartwig
This results in excessive surface strain, which can reduce the number of ECAE passes a bar can undergo before shear localization or fracture.
Reduced Exit Channel Area Extrusion is a modified square bar ECAE method explored by the authors as a technique for obtaining further grain refinement and texture in a low number of passes [4].
Im: Grain Refinement and Texture Development of Cast Bi90Sb10 Alloy Via Severe Plastic Deformation, Texas A & M University, College Station, TX (2007) p. 67-68
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