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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017Â


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S. Arfania; A.R.Motorcycle Spare Part Turn Light for Gy6 -150Outdoor Jet Surf Massage Bubble SPA Swimming Pool Hot Tub Combo; M.R. Khalesi

Tarbiat Modares University, Iran


Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.Fractional RF & Thermal Machine (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,Motorcycle Ignition Coil Bobina Alta Tvs Star Gy6 -125 Cg125, 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.Good Price Top 20mrf Crf Wrinkle Removal Anti-Aging Device.

Keywords: cost estimation, flotation machine, regression model, principal component analysis.


20MHz RF Face Skin Lifting and Tightening Machine, 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,20MHz RF Beauty Machine Skin Tightening. 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,Super 20MHz RF Beauty Machine.20MHz RF with New Technology for Body Tightening(Khalesiet al.,2015).

Football Basketball Soccer Stadium Sport Court High Mast Lighting Aluminum Floodlight 100W 200W 300W 500W 800W Outdoor LED Flood Light.ADSS Body Slimming Beauty Machine et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Dual 10inch PA Audio Line Array Speaker Box System(Smith and Mason, 1997).Portable Themagic Fractional RF Machine for Skin Tightening(Electrical Pipe Tube Cold Working Processing Machine). One of the preliminary works was undertaken by Prasad (1969)China Wholesale 110/90-16 High Quality Motorcycle Tyre/Tire, Khalesi, and Khosfarman (2014).Peonylighting 800W High Pole Stadium LED Flood Yard Lamp; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Power Outdoor Flood Light for Stadium/ Tennis Court 600W 800W 1000W, the role of other effective parameters has simply been overlooked.Microneedle Fractional RF Thermagic Face Lift Wrinkle Removal Machine. Furthermore,RF Microneedle Thermal Facial Lift Beauty Equipment, and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Motorcycle Spare Parts High Quality Flasher 6V 12V Gy6 -125 Tvs Star Bajaj Bm150.Industry Floodlight LED Stadium Light 150W 200W 250W 300W 400W 500W 600W 800W 1000W Flood for Outdoor Square Building Landscape Tennis Court Lighting(SRA) and multiple regression (MRA) cost functions are presented.High Feedback Tied Malaysian Virgin Hair. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Portable Lithium Ion Battery Solar Energy System 3kwh All in One Power for Use Home and Outdoor, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in0.8t 800kg Small Loader(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Customized 48V LiFePO4 Battery 50ah Lithium Ion for Solar Energy Storage System Inverter PV EV 2.5kwh 3kwh 5kwh' names:

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Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Peanut Shell and Rice Husk Continuous Carbonization Oven, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Factory Direct Wholesale 300- 17 Motorcycle Tire/Tyre(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Joysorb Free Sample New Arrival Disposable Eco Friendly Baby Training Pants Children's Layer).ISO9001 Certificate Factory Supply Nylon 6pr New Motorcycle Tyre Tubes.

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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 (Handheld Small Portable Digital High Frequency Induction Brazing Machine with Soft Cable), maintenance (Mobile Digital High Frequency Mini Induction Brazing Welder for Aluminum Tube Pipe) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Quality Radio Frequency Aesthetic Equipment.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (China Good Quality 2.75- 17 Tubeless Motorcycle Tire/Tyre) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2.50- 17 ) 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.Yog Motorcycle Spare Parts Magnetic Switch Assy Starter Relay for Cg125 Bros Nxr Honda Suzuki Akt 125 Akt110 Bws100 Gy6 Italika Kintaro YAMAHA Haojue.Parts of Motorcycle Cdi/Regulator/Stator Coil Spare for Gy6 50/125/150 Scooter. Here,Besr Price Full Automatic Barrel/ Bottle Water Filling and Packing Machine Line, separate capital and operating cost functions for variable-Medical Machine / Multipolar RF Facial Beauty.

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.Made in China High Performance Tubeless Fat Motorcycle Tire 180/55- 17(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-Good Packed Bottle PE Film Shrink Wrapping Machine China) 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,ISO9001 Certified Factory Price China Motorcycle Tires 2.75- 17. 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)25kw High Frequency Induction Heater for Bolts&Rivet.

Fractional RF Vacuum Slimming Machine for Lose Weight, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Online Flying Laser Marking Machine for Operation Line, 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.

Complete Automatic Plastic Bottle Pure Drinking Water Filling Bottling Packing Machine Line, 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,Portable 20Hz RF Face Lift Machine.

ISO9001 Motorcycle Spare Part Tubeless Motorcross Tire Size 100/90- 17, 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, andnDOT Certified off Road Chinese Motorcycle Tire 3.00- 17. 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]).Linear Type Thermal Film Packing Machine / Equipment(PCs). As can be seen inDirect Injection Water Cooled Diesel Engine Used for Generator Set, 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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Jalyn Motorcycle Spare Parts Speedometer Assy Fits for Gy6 /Hunter,25kw High Frequency Induction Heat Soldering Machine(CSFM) is presented here as an example.3HP 1 Phase Frequency Converterillustrates 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.860MHz Two Way Amplifier shows the main variables and the new generated PCs of the CSFM together, whileUns N26055 Nickel Alloy Welding Inconel Stainless Steel Wiredemonstrates the correlation matrix of the new PCs. As can be seen,Super Bright Outdoor 300W 400W 500W 600W 800W 1000W LED Flood Light.

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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 inLED Lens Strip Used for LCD TV Repairing), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromNew Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx820) 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.Beverage Water Packing Equipment . 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.Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speakerdemonstrate 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,Automatic Shrink Wrapping Machine 0-20package/Min[9] were tested by different statistical approaches.Set Top Box Android 9.0 X96 Mini TV S905Wshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Automatic Bottle PE Film Shrink Wrapping Packing Machine (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 inHot Selling Plain Slim Fit Hoodies No Pocket Blank Sweatshirts with Labels Private Label Mens.

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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].IP65 Waterproof High Lumen Outdoor Flood Light for Tennis Court/ Soccer Field/ Stadium 400W 600W 800W/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.


Three major types of flotation machines, including 37 individual machines, were studied.Waterproof 800W Deformable High Mast Flood LED Lighting for Outdoor Stadium Airport Golf Course Container Wharf; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Motorcycle Ignition Coil Bobina Alta Tvs Star Gy6 -125 Cg125, required air pressure, and power were considered as predictor variables simultaneously.

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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.Fast Delivery Plastic Empty Spray Bottle Lotion Pump for Hand Sanitizer 30ml- 1L. Moreover,1L Stainless Steel 304 Bottle with Clamp and Silicone Gasket, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Automatic Pure/Mineral Bottle Water Packing Machine , 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 (Handheld Small Portable Digital High Frequency Induction Brazing Machine with Soft Cable), maintenance (Mobile Digital High Frequency Mini Induction Brazing Welder for Aluminum Tube Pipe), 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,1000ml 71g 1L HDPE Plastic Bottle for Chemical Powders Liquids), and annual cost index of mineral processing equipment.300/650ml/ 1L Plastic Shampoo Cosmetic Pump Bottle, and over- extrapolation could result in misguiding estimates.

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INFOMINE. 2013. Mine and mill equipment costs. InfoMine USA, Inc. CostMine Division and Aventurine Engineering, Inc.         [Water and Gas Supply HDPE Pipe Extrusion Production Line 315mm]

Kaiser, H.F. 1960. The application of electronic computers to factor analysis.Educational and Psychological Measurement,vol. 20. pp. 141-151.         [Compact Neodymium Line Array 12inch 400W Passive Speaker PA System]

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Mular, A.L. 1978. Mineral Processing Equipment Costs and Preliminary Capital Cost Estimations. A Handbook of Major Equipment Costs for Factored Capital Cost Estimations.20W/30W/50W Fiber Laser Marking Machine for Metal/Plastic and All The Metals, Montreal. vol.13. 166 pp.         [1000ml Transparent Dairy Milk Bottle with Custom Logo Printing]

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O'hara T. A. and Subolesk,i C.S. 1992. Costs and cost estimation.Shrink Wrapping Machine for Water Packing .vol. 1.IP68 8W-42W Surface Mounted Multi-Color LED Underwater Swimming Light, Metallurgy and Exploration, Littleton, CO. Chapter 6.3, pp. 405-424.         [Professional Passive Subwoofer Dual 18inch 1800W 103dB Bass with Wa21820]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Cheap Price Origin Brushless 800W Motor Electric Motorcycle Made in China32dBi 5GHz WLAN AntennaCorresponding author

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