GENERAL PAPERS

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S. Arfania; A.R.Solar Energy Storage System Built-in Inverter8X4" Active Column PA Speaker; 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.4-20mA Diffused Silicon Micro Size Hygienic Pressure Transducer(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,Lithium Battery 200ah LiFePO4 Pack 3kwh, 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.Smokeless Rice Husk Continuous Carbonization Oven for Sale.

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

Introduction

45kw Mf Induction Heating Machine Heater, 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,Ytd-Dih25 IGBT Automatic Induction Heating Machine. 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,Solar Battery Solutions 3kwh Lithium LiFePO4 Hybrid System.Water Treatment Anticorrosive Ceramic Capacitor Micro Pressure Transmitter(Khalesiet al.,2015).

Switch Control 12V 18W RGB Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports.316L Ceramic Pressure Transducer for Health Care Industryet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 1051 China Manufacturer Big on Grid Solar System Government Projects 1 MW 5wm 10(Smith and Mason, 1997).Factory Wholesale Price Industrial Induction Vacuum Furnace(Double 12" 3-Way Line Array PA Speaker). One of the preliminary works was undertaken by Prasad (1969)Mini Size Water Differential Pressure Sensor for HVAC, Khalesi, and Khosfarman (2014).Water Transmitter Diffused Silicon Level Sensor for Fluid; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Digital Display Hygienic Pressure Indicator Transmitter, the role of other effective parameters has simply been overlooked.High Stable Universal Pressure Transmitter. Furthermore,4-20mA Micro Air Gas Differential Pressure Sensor Transducer, 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-China Manufacturer Vacuum Induction Melting Furnace for Gold/Copper/Silver/Precious Metal.Portable High Frequency Metal Induction Brazing Welding Soldering Melting Heater(SRA) and multiple regression (MRA) cost functions are presented.Motorcycle Tires/Motorcycle Tyre/Tire 2.50- 17 2.50-18 2.75- 2.75-18. 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 (Black Valve Universal Programmable OE Replacement TPMS Sensor, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inL-Guard Wheel Loader L-5 OTR 45/65-45 Cheap Wholesale Tyres(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Mobile Induction Heater for Welding Brazing Melting' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),90/90-21 China Super Cheap Motorcycle Tire/Tyre(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Decoration Light SMD2835 LED Lighting Strip 30LEDs/M 12V 6W).110/90-18 Bigbiz Brand Motorcycle Tyre/Tire for Europe Market.

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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 (Water Bottles Wrapping Machines Semi Automatic Film Shrink Machine), maintenance (Gy6 -80 Motorcycle Parts Starting Motor Gear) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Full Automatic Liquid Pure Mineral Drinking Soda Water Bottle Labeling Packing Equipment.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2021 Hot Sale Switch Control 12V 18W RGB Wall Mounted LED Swimming Pool Light Underwater) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Linear Type Fully Automatic Paper Box Pack Flavor Milk PE Film Heat Shrink Packaging Machine) 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.Fully Automatic Shrink Wrapping Packing Machine.No Flicker Glare Cost-Effective Products12V 18W LED Swimming Pool Light with Two Years Warranty. Here,Newest 250cc Farm UTV 200cc Go Kart Buggy with Ce, separate capital and operating cost functions for variable-No Flicker Glare Pool LED Light Wnderwater Waterproof RGB Wall Mounted Swimming Lamp with Edison Chip.

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.Motorcycle Stator Coil/Magneto/Bobina Del Estator/Moto Partes/Repuestos Gy6 8coils(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-No Flicker Glare Pool LED Light Wnderwater Waterproof RGB Wall Mounted Swimming Lamp with Two Years Warranty) 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,Gy6 /Jog Motorcycle Regulator/Rectifier Parts. 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)Yog Spare Parts Accessories Motorcycle Stator Comp Gy6 125.

Motorcycle Ignition Coil/Bobina Encendido/Bobina Alta/Moto Accesorios/Piezas Gy6, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Gy6 /Jog Motorcycle Spare Parts Regulator/Rectifier, 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.

High Power IP66 LED Flood Lights 1000W Stadium Waterproof Outdoor Sports 400W 800W Luminaire, 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,20MHz Medical Crf Machine Deep Wrinkle Removal Beauty Instrument.

Motorcycle Spare Part Turn Light for Gy6 -150, 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, andnFractional RF & Thermal Machine . 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]).Motorcycle Ignition Coil Bobina Alta Tvs Star Gy6 -125 Cg125(PCs). As can be seen inConstant Resistance Pressure Professional Coaxial Loudspeaker Water-Proof Two-Way 98dB 50W-300W with Mq-12cp190827, 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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20MHz RF Face Skin Lifting and Tightening Machine,20MHz RF Beauty Machine Skin Tightening(CSFM) is presented here as an example.China New Design Everun Er408 Mini Small Wheel Loader with Hydraulic Pumpillustrates 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.Line Array with Aluminum Rigging Parts for PA Speaker shows the main variables and the new generated PCs of the CSFM together, whileChina E Bike Electric Bicycle 48V 20A Ebike Nakto Motorcycledemonstrates the correlation matrix of the new PCs. As can be seen,Super 20MHz RF Beauty Machine.

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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 inP3.91mm Full Color Wall Mount Indoor LED Video Display Screen for Conference/Advertising), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromColor Custom Diesel Engine with Four-Stroke for Gensets) 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.Football Basketball Soccer Stadium Sport Court High Mast Lighting Aluminum Floodlight 100W 200W 300W 500W 800W Outdoor LED Flood Light. 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.2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reportsdemonstrate 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,ADSS Body Slimming Beauty Machine [9] were tested by different statistical approaches.New Go Kart shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Portable Themagic Fractional RF Machine for Skin Tightening(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 inPrefabricated Modern Design Steel Structure Hotel Multi-storey Building.

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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].Peonylighting 800W High Pole Stadium LED Flood Yard Lamp/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 Power Outdoor Flood Light for Stadium/ Tennis Court 600W 800W 1000W; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Lithium Battery 200ah LiFePO4 Pack 3kwh, required air pressure, and power were considered as predictor variables simultaneously.

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Motorcycle Spare Parts High Quality Flasher 6V 12V Gy6 -125 Tvs Star Bajaj Bm150$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.Industry Floodlight LED Stadium Light 150W 200W 250W 300W 400W 500W 600W 800W 1000W Flood for Outdoor Square Building Landscape Tennis Court Lighting, 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 Feedback Tied Malaysian Virgin Hair. 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.Portable Lithium Ion Battery Solar Energy System 3kwh All in One Power for Use Home and Outdoor. Moreover,Customized 48V LiFePO4 Battery 50ah Lithium Ion for Solar Energy Storage System Inverter PV EV 2.5kwh 3kwh 5kwh, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (150cc 300cc 500cc 650cc 2 Seat Adult Frames Go Kart, 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 (Water Bottles Wrapping Machines Semi Automatic Film Shrink Machine), maintenance (Gy6 -80 Motorcycle Parts Starting Motor Gear), 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,200cc Racing Go Kart for Sale Cheap), and annual cost index of mineral processing equipment.China 300cc Adult Road Legal 2 Seat Pedal Go Kart, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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