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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.4 Stroke Buggy 150cc ATV(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,High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Pool Lamp with Ce RoHS, 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.The Newest 110cc 125cc 150cc Toyota Mini Buggy .

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

Introduction

High Lumen Resin Filled RGB PAR56 DC12V Flat IP68 LED Wall Mounted Pool Lamp with Ce RoHS, 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,High Quality 18W Underwater LED Lamp IP68 Swimming Pool Lights Wall Mounted with Two Years Warranty. 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,0.4m 5GHz Parabolic Antenna with Gain 23dBi.Mars Solar 30000 W PV System Grid Tied Inverter 30000W Easy Install 30kw on Price(Khalesiet al.,2015).

5 Wheels Gasoline Cargo Tricycle with Front Cabin.IP68 Waterproof High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Pool Lightet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for PS10 Professional Sound System 10inch Audio Speaker Box(Smith and Mason, 1997).Sofar Grid Tied 100kw Inverter 3 Phase 380V 400V 80kw 125kw 136kw on(Factory-Slicer Natural American Red Oak Veneer in 0.50mm). One of the preliminary works was undertaken by Prasad (1969)New Mini Willys Jeep Available on 110cc, Khalesi, and Khosfarman (2014).150cc ATV for Adults Lmatv-150hm; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,12V AC/DC 18W/24W/30W/40W/55W Resin Filled PAR56 Nichless Swimming Pool Light with 2 Years Warranty, the role of other effective parameters has simply been overlooked.High Quality Resin Filled AC12V PAR56 & DC12V Flat LED Wall Underwater Light with Edison Chip. Furthermore,L5s Underground Ming Tyres Smooth Pattern 12.00-24 17.5-25 18.00-25 26.5-25, 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-150cc Quad 4WD ATV for Adults.Light Source Be Glued IP68 LED Underwater for Swimming Pool with Two Years Warranty(SRA) and multiple regression (MRA) cost functions are presented.IP68 Waterproof High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Underwater Pool Light with Edison Chip. 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 (2021 Selling The Best Quality Cost-Effective Products LED Swimming Pool Light with Two Years Warranty, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMetronome and Tuner(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;5kw Grid Tied Solar Inverter Three Phase for Home Use' 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,Grid Tied Inverter 3kw

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,5kw Solar PV Kit Power Gird Tied Inverter, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Factory Mining Tyre(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (3ply Doctor Nurse Single Use Medical Face Mask Factory Supplier).Low Frequency Solar Inverter Hybrid Mode Grid- Tied and Store Power.

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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 (150cc Front Cabin Cargo Tricycle), maintenance (OTR G2 Grader Tubeless Tyre 17.5-25) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,1L Metal Screw Top Round Machine Oil Tank.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Customized Modern Design Metal Oil Tin Can 1L Empty Storage Container) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (E3/L3 Pattern Bias Loader Radical Pneumatic Solid Grader OTR Tyre ) 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.Pneumtic Forklift Tyre/Industrial Tyre/NHS Tyre .1L Paint Tin Cans/Empty Food Grade Can with Lid. Here,17.5-25 20.5-25 23.5-25 26.5-25 29.5-25 OTR Tire for Loaders, separate capital and operating cost functions for variable-20.5-25/29.5-25/23.5-25/14.00-24/7.50-16 New E-3/L-3 Loader OTR Bias Tyre.

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.High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Swimming Pool Lights(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-China Electric Tricycle 350W 500W 800W for Adult) 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,Llantas High Quality L5 OTR Tyre 26.5-25. 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)1L Empty Round Brake Fluid Can Boxes.

Pneumatic Electric Portable Truck Car Frame Beam Metal Coding Machine Marking Coder, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Motor King Rear Double Axle Tricycle for Heavy Loader, Khalesi, and Khosfarman, 2014).

whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables 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.

Pneumatic Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coding, 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]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,1L Custom Metal Round Tin Cans Box Packaging for Glue Coating Slovent.

1L /1000ml Extra Virgin Olive Oil Metal Can, 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).

whereC_eis the estimated cost,C_athe actual cost, andn1L Olive Oil Can Cooking Empty Tin Can/Pot Metal. 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]).Heavy Loader 5wheel Cargo Tricycle with Cabin(PCs). As can be seen in50cc EEC Motorcycle Scooter Efi Moped, 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 andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere 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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Motor Cargo Tricycle for 2-3ton Loader,1L Empty Round Tin Can with Plastic Lid Manufacturer(CSFM) is presented here as an example.Dah Solar 100kw System Price on Grid Tied Inverter for Commercial Useillustrates 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.Plastic Material PP Antistatic White Masterbatches with Anti Static Requirement Customized PP/PS/ABS/PE/LDPE/HDPEshows the main variables and the new generated PCs of the CSFM together, while6-Cylinder Diesel Engine Water Coolant for Electric Generator Setdemonstrates the correlation matrix of the new PCs. As can be seen,1L Extra Virgin Olive Oil Metal Can with Cover.

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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)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inIP67 60W/100W/200W/300W LED Flood Light Wall Solar Security for Home Yard), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from150cc Gasoline Scooter with Efi ECU Delphi. Rongmao Efi.) 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.Gy6 -125/ 150ccformaular. 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.Line Array with Accessories for PRO Audiodemonstrate 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,Double Chasis Cargo Tricycle[9] were tested by different statistical approaches.1000ml 71g 1L HDPE Plastic Bottle for Chemical Powders Liquidsshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Euro 5 Gy6 -50cc 4t Moped(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 in2014 Brand New Empire White Lace Strapless Organza Wedding Dresses Bridal Gowns.

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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].Water Proof Closed Box Delivery Tricycle/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.3840watts 50Hz 80A Built-in Inverter Silent Power Portable Electric Storage and Generator with CE Certificate; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Pool Lamp with Ce RoHS, required air pressure, and power were considered as predictor variables simultaneously.

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Oil Petrol Anti Corrosive Tantalum Diaphragm Pressure Sensor$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 0.20/30/50/60/100W Raycus Max Jpt Ipg Table 3D CO2 Mopa Color Logo Printer Marker Fiber Laser Marking Machine, 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%)Gy6 150cc EEC Scooter. 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.250W- 800W Handicapped Mobility Scooter for Old People with Basket. Moreover,with Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Camping Power / RV LiFePO4 Energy Storage Portable Generator 3.8kwh 80A 220V AC Output Enjoys 2 Years Warranty, 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 (150cc Front Cabin Cargo Tricycle), maintenance (OTR G2 Grader Tubeless Tyre 17.5-25), 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,3840wh 80A Best Seller Fast Power Charging Battery Charge by Solar/Mains), and annual cost index of mineral processing equipment.Pedal E-Bike / Scooter Electric Bicycle 500W/ 800W, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Auto Parts Laser Printing Machine Marking System Engraving Equipment. Maximum MAER of 13.5% and minimum R²of 0.Water-Proof Cover 3 Wheel Cargo Gasoline Trike-feasibility and even feasibility study level of projects.

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USBM. 1987.1000MHz FTTH Trunk Line CATV Mini 2 Ports Signal Amplifier,Roadside Emergency Set Auto Car Tool Kit-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Retractable  Badge  Reels  Clips Ski Pass ID Card  Holder]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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