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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.High Power Horn Speaker H3(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,Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box, 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.Levamisole Hydrochloride CAS 16595-80-5 in Stock.

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

Introduction

Fast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4, 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,Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606. 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,2.4GHz Wireless Ceiling Speaker PA System.OEM ODM Public DJ PA Wooden Speaker(Khalesiet al.,2015).

Double 12" Line Array Speaker.Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2021 Selling The Best Quality Cost-Effective Products LED Swimming Pool Light with Edison Chip(Smith and Mason, 1997).PA Speaker with Single-Point Angles Regulator (Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer). One of the preliminary works was undertaken by Prasad (1969)12 Inch Stage Subwoofer Home Theater/DJ Sub PRO Audio, Khalesi, and Khosfarman (2014).Peq-12A-Active PA Speaker with Class-Ab Mono Amplifier Bluetooth; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2, the role of other effective parameters has simply been overlooked.CAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%. Furthermore,High Purity Colorless Liquid CAS 1009-14-9 Valerophenone with Lowest Price, 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-Pharmaceutical Intermediate Bulk Price N- .Cinnamaldehyde CAS 104-55-2 Cinnamic Aldehyde Factory Supply(SRA) and multiple regression (MRA) cost functions are presented.Einecs No. 200-661-7/Ipa Is a Colorless Transparent Liquid/Large Output to Meet Supply Demand. 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 (Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFactory Supply Tretinoin / Retinoic Acid Vitamin a CAS 302- 79 -4(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Speaker System High Power H3' 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,Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Lat210A Srx700 Series PA Sound System Professional Speakers, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Professional Public Address Mini Onwall Line Array Speaker (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Tumbler Stainless Steel Travel Camping Wine Coffee Mug with Handle).Q1--Dual10 Inch Line Array Speaker.

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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 (12inches PA Speaker Audio Component), maintenance (Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Portable Black Floor Tripod Speaker Stand Adjustable for 12 Inch PA.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Power Amplifiers PA Speaker System Amplifier 1000 Watt) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Wholesales Organic Intermediate 1) 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.Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell.Live/Installed Sound System PRO Speaker Box . Here,Outdoor Double 6" Full Range Speakers 12" Active Subwoofer Professional Audiomini Live Bands System for Musician PA, separate capital and operating cost functions for variable-Professional Speaker with Laser Light .

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.XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker(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-Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights) 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,L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array 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)100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4.

High Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Free Sample Organic Chemicals 1, 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 Quality Phena, 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,Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4.

18" Fane Style Aluminum Speaker Frame, 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, andn18" Die Cast P-Auido Style Aluminum Frame. 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]).Professional Stage Active Line Array Speaker with DSP(PCs). As can be seen inVera 12 Loudspeaker Line Array Speaker System, 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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Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse,12" Professional Rcf Style Speaker Frame(CSFM) is presented here as an example.PE Pipe Extrusion Machine Line/HDPE Production Line/Plastic HDPE/LDPE /PPR Electricity Conduit Tube/ Water Sewage& Pressure Supply Lineillustrates 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.Mc4y Solar Connectorshows the main variables and the new generated PCs of the CSFM together, whileMini Kd Key Generator Remotes Warehouse in Your Phone Support Android Make More Than 1000 Auto Similar Kd900demonstrates the correlation matrix of the new PCs. As can be seen,Horn Professional Speaker H3.

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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 inWhite Color Acrylic Classical Bathtub with Four Claw Feet), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromFree Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse) 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 0.18'' Subwoofer Speaker Box Ls1200. 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.High Purity Ethylamine HCldemonstrate 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,Dual 12" Subwoofer Speaker Box[9] were tested by different statistical approaches.Jarol Frequency Inverter JAC200 3 Phase 380V 4kwshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional(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 inHigh Precision Woodworking Machine 1325 Wood Carving CNC Router.

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Cost model for variable-Fast Delivery 1

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].Professional Speaker Box F12+/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.Df B&C Trees Speaker Subwoofer Audio Professional; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box, required air pressure, and power were considered as predictor variables simultaneously.

15'' Coaxial Speaker . Moreover, the operating cost was detailed in different cost items.Customs Guaranteed 1, indicated inCustom Printing Food Packaging Plastic Bags with Resealable Zipper, and major extrapolation should be avoided.

China Factory Supply Ethylmagnesium Bromide CAS 925-90-6$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.Ltk One 12" Woofers and 3" Driver Compact Coaxial 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%)Manufacturer Supply Bdo Novel Intermediate 1. 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.Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro. Moreover,99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole, 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 (12inches PA Speaker Audio Component), maintenance (Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth), 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,400 Watt Portable Music Player Speaker Professional Audio), and annual cost index of mineral processing equipment.Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Dm 15 Inch PA Full Sound Systems Professional PRO Speaker. Maximum MAER of 13.5% and minimum R²of 0.12inch KTV Bar PA Full Sound Speaker System Audio-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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