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Custom Cheap Metal Enamel Alphabet Safety Hollow Brooch Lapel Pin Badge with Your Logo
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
150cc/200cc/250cc / 300cc Three Wheel Cargo Motorcycle /TricycleCost modelling for flotation machines
S. Arfania; A.R.Professional Two-Way Speaker 4X6.5inch 100dB 600W Line Array PA Audio System with L7Professional Digital Audio Line Array System Dual 10 Inch Active; 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.12nw76D- PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker(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,Double 12" 3-Way Line Array PA Speaker, 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.Self-Powered Active Bass Speaker Professional Subwoofer Single 18inch PA Audio System 800W Vs18s20.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
PA Speaker Parts&Accessories Back Plate Speakon Nl4 , 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,Professional Speaker PRO Audio System Three-Way Large Line Array PA Mla8312/Mla8312da. 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,15 Inch PRO Audio Speaker Woofer with Dual Voice Coil Design Loudspeaker.Factory Wholesales Prilocaine Hydrochloride 2% Hyperbaric Solution for Intrathecal Injection CAS: 721-50-6(Khalesiet al.,2015).
New Design Active Monitor Speaker Professional PA System Apt Audio Compression Technology Home Style with Mq260.CAS No.: 67-63-0 Isopropyl Alcohol et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Efficicency Roof Mounting Grid Tied Home Solar Energy System(Smith and Mason, 1997).PA Speaker Parts of T24 12 Inch (High Speed CKD SKD Pedals Disc Brake Electric Motorcycle Scooter for Olderly or Adult). One of the preliminary works was undertaken by Prasad (1969)PA Speaker with Horn Parts 210L*62W*105h 1"X2 , Khalesi, and Khosfarman (2014).PA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Array; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% / Isopropanol, the role of other effective parameters has simply been overlooked.Food Grade L Selenomethionine Powder/L-Selenomethionine. Furthermore,120W 12" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics, 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-Powersoft Professional Line Array Active Subwoofer Column System DSP PRO Audio Speaker PA Ml15SA.Single 15 Inch PA Full Sound Systems Professional PRO Speaker(SRA) and multiple regression (MRA) cost functions are presented.Cheap Price PA Speaker of Line Array Rigging 8 Inch . 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 (Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNew Generation Engine Er08 Wheel Loader with CE/Bucket for Sale(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;PA Speaker Horn for Stage 180L*180W*106h 1" ' 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,Full Range Portable Multi-Fuction Speaker Box
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Lidocaine Hydrochloride CAS 73-78-9 HCl(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (China Supplier Finished Customized Tungsten Carbide Extrusion Die).PA Speaker Parts .
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 (Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801), maintenance (Remote Control Coaxial Ceiling Speaker Professinoal PA System Power 220W with Mq8CD190801) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Line Array PA Speaker System Stage 12inch Monitor PRO Audio.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Wholesale Price Professional PA PRO Audio Sound System Loudspeaker) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Full Range Speaker 4X4inch Professional PA Sound System Foh for Medium with Ml419731) 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.Music PA Speaker Double 12 Inch Full Range.PA Column Speaker Empty Alu. Cabinet 4.5" . Here,PRO Audio Speaker 12 Inch Sub PA Passive Speakers, separate capital and operating cost functions for variable-PA Speaker Steel Back Plate .
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.Professional Speaker Power Line-Array Actives Stage Loudspeaker PA System with Vs12(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-Line Array with Aluminum Rigging Parts for PA Speaker ) 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,Outdoor Big Power Karaoke Trolley Loud PA Speaker. 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)20dB Gain DJ Mixing Console with MP3 Input .
PA System LED Light Trolley Tws Woofer Speaker Party Audio, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System, 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.
50W 8" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics, 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,High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers.
K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets , 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, andn12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage. 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]).Proxima Entertainment S-320 Speaker(PCs). As can be seen inFactory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Price, 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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Sp215 Sound Prince Style Speaker Acoustic,China GMP Factory Supply Ester Anesthetic Prilocaine Base Raw Powder USA Warehouse CAS: 721-50-6(CSFM) is presented here as an example.Manufacturers Supply Top Quality Larocaine Powder with Best Price CAS: 94-15-5illustrates the high correlation between predictor variables for the CSFM.
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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.3840watts AC Output Built-in Inverter 80A Silent Power Portable Electric Storage and Generator with CE Certificateshows the main variables and the new generated PCs of the CSFM together, whileNutrition Enhancer Hot Selling High Quality N-Glycyl-L-Tyrosine Powder CAS 658- 79 -7 White with Reasonable Price and Fast Deliverydemonstrates the correlation matrix of the new PCs. As can be seen,Cheap 500W Professional Audio Speakers Dual 15 Inch Speaker .
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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 inClear 150ml Flint Glass Bottle Ketchup with Cap), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSolar Pump Inverter 1.5kw AC Drive Frequency Welding Machine) 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.Passive Full Range 2-Way Speaker Line Array for Outdoor. 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.Hot Selling A5X Max Rk3328 4GB 32GB Android TV Box 4K Full HD Quad Core Smart for Internet Set Topdemonstrate 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,Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse[9] were tested by different statistical approaches.2ND Generation Ultrasound Bone Densitometershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Power Horn Speaker H3(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 inLawn Mower Cable Boundary for Worx Gardena Robomow Ambrogio Automower.
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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].Levamisole Hydrochloride CAS 16595-80-5 in Stock/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.Fast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Double 12" 3-Way Line Array PA Speaker, required air pressure, and power were considered as predictor variables simultaneously.
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OEM ODM Public DJ PA Wooden Speaker$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.Double 12" Line Array Speaker, 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%)Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01. 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.PA Speaker with Single-Point Angles Regulator . Moreover,12 Inch Stage Subwoofer Home Theater/DJ Sub PRO Audio, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Peq-12A-Active PA Speaker with Class-Ab Mono Amplifier Bluetooth, 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 (Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801), maintenance (Remote Control Coaxial Ceiling Speaker Professinoal PA System Power 220W with Mq8CD190801), 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,Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2), and annual cost index of mineral processing equipment.CAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,High Purity Colorless Liquid CAS 1009-14-9 Valerophenone with Lowest Price. Maximum MAER of 13.5% and minimum R2of 0.Pharmaceutical Intermediate Bulk Price N- -feasibility and even feasibility study level of projects.
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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