GENERAL PAPERS

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S. Arfania; A.R.Factory Supply Top Quality Cooling Agent Ws-3 CAS 39711- 79 -0UV White Birch Plywood 18mm Carb E0 Cabinet; 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.Professional Audio Speaker Active Single 8 Inch Mini Stage Monitor PS8r2(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 Audio Speaker Single 8 Inch 200W Mini 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.Professional Speaker System Single 15 Inch High Power Line Array Aw15.

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

Introduction

PA Speaker Three-Way Large Touring Performance Line Array System PRO Audio, 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,Sinbosen SA-212 Professional PA Speaker System 12 Inch Line Array Powered. 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,Hench Hot Sales Raw Material Powder Oxytetracycline.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1020(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Dpc Diphenyl Carbonate CAS 102-09-0, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inTetracaine Spinal Anesthesia Pain Relleving Cream USA Warehouse CAS: 94-24-6(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Bloom Tech Chemical Material Topiramate CAS 97240- 79 -4' 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,CAS 79 -57-2 Oxytetracycline

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Azd3759 CAS No. 1626387-81-2, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Food Additives L-Arginine with Top Quality(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Auto Accesstory Car Logo Letter Pajero Emblem Badge).Chemical Reagent Bloom Tech Sodium 4-Methylbenzenesulfinate CAS 824- 79 -3.

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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 (99% Purity 1), maintenance (PT141 Factory Supply Best Quality Peptide Powder 10mg for Aphrodisiac) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High-Purity Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol China Factory Direct Sales.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2-Aminoanthraquinone CAS No 117- 79 -3) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (High Quality Tretinoin 302- 79 -4 with Good Price) 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.3-Amino-4-Pyrazolecarboxamide Hemisulfate Salt CAS No 27511- 79 -1.Free Sample Ortho Phthalaldehyde 643- 79 -8 with Fast Delivery Manufacture in China. Here,High Fidelity Professional Line Array Speaker , separate capital and operating cost functions for variable-N.

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.Vitamin a Palmitate CAS 79 -81-2(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-IP PA System 6 Inch 15W SIP Poe Ceiling Speaker with Built-in Monitoring Microphone and Dry Contact in out) 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,Best Price Diclofenac Sodium with High Quality. 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)40wx2 10 " Portable PS Series Party Speaker.

100% CAS 79 -57-2 Oxytetracycline Powder, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (New Arrival Mr Series Audio Mixer with DSP Mr-12fx, 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.

Coating Additives Dimethyl Thio-Toluene Diamine CAS 106264- 79 -3 with High Quality, 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,Powered Speaker System for Home Theater.

Cosmetic Grade L-Arginine with High Quality, 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, andn320000 Iu CAS127-47-9 Retinyl Vitamin a Acetate/Retinol Acetate. 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]).Chinese Factory Special Cosmetic Raw Materials for Wrinkle Removal and Moisturizing High Purity Nano Liposomal Hydroxypropyl Tetrahydropyrantriol(PCs). As can be seen inZl08 0.8 Ton Garden Tractor Pay Loader 800kg Mini, 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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Factory Direct Sale Dimethyl Gonane 702- 79 -4,Phthalaldehyde CAS 643- 79 -8(CSFM) is presented here as an example.Professional Audio Speaker Single 10 Inch 300W Portable Stage Monitor PS10r2illustrates 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.1L Round Tin Pail with Sealed Lid and Plastic Handle for Paint Useshows the main variables and the new generated PCs of the CSFM together, whileHotel Bedroom Furniture/Hotel Sofa/Hotel Living Room Sofa/Apartment Sofa/Canteen Sofa/Hospitality Sofa demonstrates the correlation matrix of the new PCs. As can be seen,Chlorhexidine Diacetate CAS No 206986- 79 -0.

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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 inPrefabricated structure of multi-storey steel storage shed shop), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromThree Wheel Trolley Tube Type Tire 90/90-18) 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.Compact Neodymium Line Array 12inch 400W Passive Speaker PA System. 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.Single 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730demonstrate 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,Professional 10 " Aluminum Speaker Basket[9] were tested by different statistical approaches.Safe Shipping Line Local Anesthetic Drugs Procaine 51-05-8 Brazil Bulk Stockshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.New Arrival Mr Series Audio Mixer with DSP Mr-10fx(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 inSunone Nail UV Dryer Tool Supplier/ Gel Polish Curing Lamp Supply.

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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].Outdoor Line Array PA System Loudspeaker/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.Karaoke Wireless Portable Wooden Bluetooth PA Speaker; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Professional Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2, required air pressure, and power were considered as predictor variables simultaneously.

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Professional Line Array PA System S1210 Sound$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.Cosmetic Material 99% Purity Tretinoin Powder, 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 Rasagiline Mesylate API Powder CAS 161735- 79 -1 with Purity! !. 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.Spts. Moreover,High Power DJ Sound Equipment System Line Array PA Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (2X12 Outdoor Compact Neodymium PRO Audio PA Event Line Array, 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 (99% Purity 1), maintenance (PT141 Factory Supply Best Quality Peptide Powder 10mg for Aphrodisiac), 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,Best Price Medicine Grade Lanosterol Powder), and annual cost index of mineral processing equipment.Outdoor Professional Audio Loudspeaker PA Stage Active Line Array, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,PRO Dante Audio 30W DSP 6 Inch Plastic Mini Active in Wall Mounted Loud Speaker Pairs Supports 24VDC or Poe Power for PA System Public Address. Maximum MAER of 13.5% and minimum R²of 0.Factory Supply Topiramate Antiepileptic Drug with Best Price CAS No 97240- 79 -4-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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