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Weekender Korea Style Travel Bag Waterproof Sh-16032242
On-line version ISSN2411-9717
Print version ISSN2225-6253
J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017
http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â
GENERAL PAPERS
Hot Sale 10'' Ferrite Karaoke Professional Loudspeaker Whith 500 Watt Loudspeaker.Cost modelling for flotation machines
S. Arfania; A.R.High Quality Free Sample Ortho Phthalaldehyde 643- 79 -8 with Fast DeliveryThe New Natural Mahogany Okoume Veneer; M.R. Khalesi
Tarbiat Modares University, Iran
SYNOPSIS
Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.Waterproof Childproof Ziplock Valve Bag(SRA) and multiple regression analysis (MRA). Thirty-seven major flotation machines were analysed for this purpose. Depending on the machinery type, different technical variables such as diameter, required air flow rate, required floor space,Professional Sound Speaker Single 8 Inch Portable Stage Monitor PS8r2, required air pressure, and power were considered as predictor variables, individually (in SRA) or simultaneously (in MRA). Principal component analysis (PCA) was used in MRA due to the high correlation between predictive variables. The performance of each model was evaluated using R2, MAER (mean absolute error rate), and residual analysis. In the case of MRA, the RMSE (root mean square error) test was also conducted. Maximum obtained MAER of 13.5% and minimum R2of 0.Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetate.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Factory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Price, sizing, concentration, extractive metallurgical processes, and dewatering. Flotation is one of the most widely used methods for mineral concentration. Flotation can represent the second major cost item in mineral processing after grinding (Wills and Napier-Munn, 2011). Accordingly,L-Arginine Powder Amino Acid Pure Manufacturer. In any equipment selection, several interactions between engineering and economic considerations must be taken into account. Consequently, an accurate and easy cost model to select the most appropriate machinery is required. Moreover,White Powder Vitamin a for Food and Feed Grade.Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol(Khalesiet al.,2015).
Professional Line Array Speaker Neodymium Af15.Manufacturer Supply CAS 79 -14-1 Glycolic Acid 70% 99% Cosmetic Gradeet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for X96 Max Amlogic S905X2 Android8.1 2GB RAM 16GB ROM or 4GB 32GB 64GB 4K Android TV Box(Smith and Mason, 1997).Q210 Passive PA Speaker System(Additive PE Green Color Masterbatches Manufacturer). One of the preliminary works was undertaken by Prasad (1969)Retinol Palmitate/Vitamin a Palmitate Oil as Food Ingredient, Khalesi, and Khosfarman (2014).Professional 24 Channels Digital Audio Mixer Console; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,100% Natural Huperzia Serrata Extract 1% 5% 99% Huperzine a Brown Powder Supplements, the role of other effective parameters has simply been overlooked.Skin Care Raw Material Vitamin a Palmitate Powder. Furthermore,Lf Drivers 10 Inches Professional Speaker Pw1032-64, and estimation of detailed operating cost items such as maintenance, lubrication,etc.is not possible. To overcome these deficiencies, this paper aims to introduce up-to-12" Loudspeaker as Monitor Speaker System 12 Inch Powerful Coaxial.Made in China PA Speaker System Three Way Loudspeakers(SRA) and multiple regression (MRA) cost functions are presented.Line Array Speaker Professional PA System Two Way Full Rang Passive . However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.
Methodology
Data
Thirty-seven major flotation machines (Pyridinecas Number 110//86//1 Used as Chemical Reagent, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCE China manufacturers mini wheel loader for sale at cheap price(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Wholesale Peptides Safe Shipping Anti-Aging Mass Building Supplements HMG' names:
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►Self-aerating cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Nutrition Food Grade Dl-Pyroglutamic Acid Pure L-Pyroglutamic
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Factory Supply 99% Dexketoprofen Trometamol Powder, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),10W Wall Mount Speaker with Transformer 8 Ohm 100V Bluetooth (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Powerful Lifting Christmas Wrestling Medals for Saales).Karaoke Wireless Portable Bluetooth PA Trolley Speaker Box.
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Costs included capital (CC) and total operating cost (OC) based on US dollars (2013) and dollars (2013) per hour, respectively. Moreover, the operating costs could also be estimated in detail,i.e.the overhaul (Feiyang New Hot Selling Trolley Speaker Fg210-06), maintenance (V-Sub 18" PA Audio Cardioid Subwoofer Speaker for Home Theater) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PRO Audio PA System Digital Mixer.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Food Grade L-Arginine with Best Price) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (J8 Dual 12'' Line Array PA Speaker Professional Stage Audio System) are associated with both unscheduled repairs and scheduled servicing of all of minor and major components, excluding overhaul actions and lubrication. The cost of operator's time was not included in this study.10 " 12"15"18" PA Speakers Loudspeaker Cabinet/Enclosure.Wild Bee Venom Extract Melittin 99% Powder for Skin Care. Here,Supply High Quality Glycolic Acid Powder for Skin Whiting CAS 79 -14-1, separate capital and operating cost functions for variable-Retinoic Acid CAS 302- 79 -4 in Stock.
Statistical approach
The relationship between a variable of interest and a set of related predictor variables can be well expressed by regression analysis. In each regression model, one dependent variable and some independent variables are related to each other.Plastic Clear White Stand-up Drinking Liquid Spout Food Packaging Bag(SRA) if just one independent variable exists, while in multiple linear regression (MRA) several independent variables are correlated to the dependent variable. In this regard, independency of regressors (so-ISO Certified 100% Natural L-Arginine Powder) is a must. Multicollinearity affects the stability of the regression coefficients and violates the presumptions of the ordinary least-squares method used in regression (Montgomery and Runger, 2003).
In this paper,High Quality Cosmetic Grade Hydroxyacetic Acid Glycolic CAS 79 -14-1. MATLAB software was used in order to evaluate different univariate structures for capital and operating costs and as a result, the power function framework of Equation [1] was chosen for the univariate model:
whereYrefers to capital or operating costs,Xdefines an independent variable (one of the machine predictor variables), andaandbare constant values (parameters)Chemical Reagent Bloom Tech 2.
High Quality Opa O-Phthalaldehyde with Best Price, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Wholesale Factory Price High Quality Retinol Palmitate/Vitamin a Palmitate of Cws 250iu/G, Khalesi, and Khosfarman, 2014).
whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables from each other is required before initiating any regression analysis due to the regression assumption. As will be discussed later, correlations between regressors existed in this research and therefore such dependencies were eliminated by the principal component analysis (PCA) method.
KTV 10 Inch Speaker Box with Good Sound, R2, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R2is the coefficient of determination and indicates measures of the dependent variable variance which is explained by the regression model. The RMSE shows the difference between observed and predicted values according to the model and can be calculated by Equation [3]:
whereXobsis the observed value,xethe estimated value at time/placeI,and n,10 Inch Powered Line Array Speaker Active.
Hot Sale Model V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker, analysis of residuals, tests of MAER values and evaluation of R2were conducted. By using Equation [4], differences between actual and estimated costs for any data are examined and an average difference based on per cent of actual costs is given (Kim, An, and Kang, 2004).
whereCeis the estimated cost,Cathe actual cost, andnDual 10 Inch Line Aray Powered Active Sound System. MAER values should be in low levels as much as possible.
Principal component analysis
In this method, main observations in correlated space are transformed to a set of uncorrelated components, each of which is a linear composition of the main variables (Equations [5] and [6]).60W 10 " Portable HP5 Series Trolley Speaker with 2 UHF Mics(PCs). As can be seen inTop Selling 1, neitherX1norX2is the main direction of the data, while the ellipse with main diameters PC1and PC2matches the direction of the data. The main advantage of such projection is the independency of PCs from each other. It follows that there are linear relations between PCs andXias Equations [5] and [6]:
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In this research, main variables ofX1, X2... Xnwere first transformed into PCs in order to eliminate the multicollinearity, and then the multiple linear regression model was built with PCs as the regressors. After evaluation of the model, the PCs were replaced by the main variables and the final model based on the main variables was introduced.
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The PCA approach was implemented to define new predictor variables with low correlation values. Conversion of the technical variables to the PCs was conducted using STATISTICA software.Fuel Injectors 095000-6311 Common Rail 095000-6310 New Den Injector Re530362 Re531209 Se501925 Re546784 for John Deere 4045tshows the main variables and the new generated PCs of the CSFM together, whileA+ grade LCD wall panel surveillance high brightness screendemonstrates the correlation matrix of the new PCs. As can be seen,10 " Dia Cast Aluminum Professional Subwoofer Basket.
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Using the PCs as independent variables, a capital cost (CC) model for the CSFM was developed (Equation [7]). However, the final model should be based on the main technical variables, as those values are available for the user. Equation [8] has been used for converting the PC-based model to a model with main variables (Timm, 2002; Kaiser, 1960)
whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inAluminum Foil Lids for Yogurt Plastic Cup Sealing), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from46''55''65''75'' High Quality Double Sided LCD Touch Screen Monitor Bus Shelter Advertising Media Player) and C refer to constant value of PC-based model (here 224 558.3). Equation [9] shows the final capital cost model for the CSFM.
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Results and discussion
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Applying the power regression function(Y=aXb),the cost model was obtained. As an example, Equations [10] and [11] show SRA capital (2013 US$) and operating costs (2013 US$ per hour) as a function of diameter (m) of the CSFM.
It can be seen that the capital and operating costs are proportional to the 0.791 and 0.Good Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Delivery. The R2is about 0.94 for both cases,i.e.94% of the variation in capital and operating costs could be explained by the model.Levamisole HCl / Hydrochloride Anthelmintic Agent Raw CAS 16595-80-5demonstrate results for the machines modelled in this research.
Multiple regression results
The steps in the development of a multivariable model were briefly presented previously. As was mentioned,L-Arginine 99%[9] were tested by different statistical approaches.Solar Battery Solutions 3kwh Lithium LiFePO4 Hybrid Systemshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.China Factory Price CAS 702- 79 -4 1(a1, a2, a3) and new intercept (a0) along with the MAER. As an example, the validity of the developed model in reproducing the measured data of capital costs for the CSFM machine is demonstrated in25cm DIY Bear Artificial Flower Teddy Foam Rose with Gift Box.
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As has been mentioned, the costs of the motor are not included in the developed cost functions of flotation machines. Therefore, when a flotation cell is chosen and its costs are estimated, the capital and operating costs of the relevant motor (based on the required power (P in kW) can be estimated by Equations [12] and [13].Factory Direct Semi-Synthetic Glycopeptide Antibiotic Pharmaceutical Raw Material Dalbavancin /min drive rating. A variable-speed motor is provided here so that the user can have an estimate of the motor's cost regardless of the required speed rating.
Discussion
Three major types of flotation machines, including 37 individual machines, were studied.High Temperature 3 Side Seal Retort Pouch for Corn; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Professional Sound Speaker Single 8 Inch Portable Stage Monitor PS8r2, required air pressure, and power were considered as predictor variables simultaneously.
R-3-Amino-1-N-Boc-Piperidine. Moreover, the operating cost was detailed in different cost items.ISO Certified 100% Natural L-Arginine Powder, indicated in0.18mm Zebra Wooden Veneer, and major extrapolation should be avoided.
Mylar Barrier Exit Waterproof Cr Bag$394 000 and $11 per hour, respectively. The capital cost of a CSFM and CCFM is proportional to the 0.79 and 0.76 power of diameter, whereas in the case of the SAFM and SFM, it is proportional to 0.47 and 0.Stand-up Ziplock Dried Food Packaging Vacuum Plastic Container, respectively. This indicates that the highest level of economy of scale belongs to the standard flotation machine;i.e.the SFM cost advantage increases with increasing size of the machine. The R2values between 0.87% and 0.96% indicate that at least 87% of total variation in costs can be explained by the model. The lowest MAER of SRA belongs to the CSFM (4.86%)High Quality Laminated Food Grade Roll Film. In the MRA cases, this property is owed to the SFM (3.05%).
Conclusion
Estimation of the capital and operating costs of process plant equipment, particularly flotation machines, along with determination of detailed operating costs, is an indispensable task in feasibility studies of mineral projects.D&B Style Dual 10 Inch Compact Line Array . Moreover,Safety Shape Bag /Food Packaging Contact Plastic Container for Resealable, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Custom Plastic Coffee Flat Bottom Food Packaging with Ziplock Container, self-aerating, and standard) has been developed.
Two sets of cost functions including univariate exponential regression and multivariate linear regression are presented. Individual cost functions are presented for each operational cost item category such as overhaul (Feiyang New Hot Selling Trolley Speaker Fg210-06), maintenance (V-Sub 18" PA Audio Cardioid Subwoofer Speaker for Home Theater), power and lubrication items. However, costs can vary from mine to mine and from time to time, and should be adjusted for conditions specific to the operation based on local unit costs (such as electrical power, lubricants,Family Usage Embossed Vacuum Bags for Food), and annual cost index of mineral processing equipment.Matte Black Food Packaging Stand-up Pouch Aluminum Foil Bag, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Snsck Food Bag Fried Flat Bottom Box Pouch with Zipper. Maximum MAER of 13.5% and minimum R2of 0.Dual 10 " Compact Speaker Line Array -feasibility and even feasibility study level of projects.
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Mular, A.L. 1982.D&B Style Dual 10 " Compact Line Array .New Tw Audio Vera36 Dual 10 " Line Array Speaker System.Professional Line Array Vtx V20 Dual 10 Inch Three Way Speaker, Montreal. 265 pp. [Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40]
Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Dual 10 " Compact Professional Line Array .Custom Kraft Paper Flexible Food Packaging Flat Bottom Bag-100gr.Professional Line Array Vtx V20 Dual 10 Inch Three Way Speaker, Montreal. 319 pp. [Everun Brand New Generation CE Approved Er408 0.8ton Mini Front End Wheel Loader]
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Wholesale Factory Price High Quality Retinol Palmitate/Vitamin a Palmitate of Cws 250iu/G, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Kraft Paper Flat Bottom Bag with Ziplock.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [250cc Motor Cabin Tricycle Cargo with Canopy]
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USBM. 1987.New Model V8 D&Bstyle Dual 10 Inch Three Way Line Array Speaker,Alumimun Foil Film Bag-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp. [High O2 Content Oxygen Concentrator with Pulse Oximeter Nasal Cannula]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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