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S. Arfania; A.R.Professional Speaker with Laser Light Lat210A Srx700 Series PA Sound System Professional Speakers; 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.XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker(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 Multifunction Active Stage Speaker Wood Bt with Laser Lights, 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.L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker.

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

Introduction

100% Safe Arriving Australia GB-B L 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,High Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price. 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,Free Sample Organic Chemicals 1.High Quality Phena(Khalesiet al.,2015).

Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4.18" Fane Style Aluminum Speaker Frameet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Dsola Customized High Heat Resistance 2 Pins Mc4 Solar Connector(Smith and Mason, 1997).18" Die Cast P-Auido Style Aluminum Frame(Loudspeaker 10'' Midrange & Bass). One of the preliminary works was undertaken by Prasad (1969)Professional Stage Active Line Array Speaker with DSP, Khalesi, and Khosfarman (2014).Single 18" Subwoofer Speaker Box; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse, the role of other effective parameters has simply been overlooked.12" Professional Rcf Style Speaker Frame. Furthermore,Horn Professional Speaker H3, 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-Coaxial Loudspeaker TD12.18'' Subwoofer Speaker Box Ls1200(SRA) and multiple regression (MRA) cost functions are presented.Dual 12" Subwoofer Speaker Box. 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 (DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Toughness and Tensile Strength Resin 610(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Fast Delivery 1' 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,China Factory Supply Ethylmagnesium Bromide CAS 925-90-6

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Manufacturer Supply Bdo Novel Intermediate 1(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Dahua Supply 15ml Glass Perfume Bottles Wholesale).Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro.

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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% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6), maintenance (China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,400 Watt Portable Music Player Speaker Professional Audio.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Dm 15 Inch PA Full Sound Systems Professional PRO Speaker) 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.12inch KTV Bar PA Full Sound Speaker System Audio.Dare Dual 8" Neodymium Active Line Array Set PA System. Here,12" Die Cast Aluminum PA Speaker Frame, separate capital and operating cost functions for variable-PA Speaker Dual 18" Subwoofer System.

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.PA Speaker with Line Array Tweeter Horn (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-Active Mini Line Array Speaker with DSP Amplifier Module) 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,Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder. 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)High Quality Karaoke Loudspeaker with B&C Compression Driver.

99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Factory Supply BMK Powder Glycidate CAS: 5413-05-8, 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.

China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone, 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,Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder.

99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8, 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, andnHigh Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price. 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]).Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5(PCs). As can be seen in50 to 60 Hz Frequency Converter, 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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99% 4'-Hydroxyacetophenone CAS 99-93-4 100% Pass Customs,62442 Shiny and Non Phena Powder 62 44 2(CSFM) is presented here as an example.Diesel Engine Parts Fuel Injection Nozzle 140s6655illustrates 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.PE Dog Food Pouch with Holeshows the main variables and the new generated PCs of the CSFM together, whileChinese Suppliers Okoume Wood Face Veneer for Malaysiademonstrates the correlation matrix of the new PCs. As can be seen,Quality Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate.

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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 inVafuntea Papaya Hip Lift Oil), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from3kwh LiFePO4 Battery System Energy Power) 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 0.100% Passing The Customs Europe Free Shipping BMK Glycidate 16648-44-5. 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.Hot Sale Professional Loudspeaker PRO Audio demonstrate 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,Trolley Large Audio Loudspeaker Box Professional Stage Active PA Speaker[9] were tested by different statistical approaches.99% High Purity Tiletamine Xylazine Veterinary Anesthetic CAS: 14176-50-2 HClshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6(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 inBakery Machine High Efficiency Combination Freely Commercial Rotary Convection Oven.

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Cost model for variable-Portable 15inch PA Speaker F15+

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].Pharmaceutical Chemical CAS 236117-38-7/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.Speaker 12 Inch SA-212 Professional Sound Box Portable Passive; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights, required air pressure, and power were considered as predictor variables simultaneously.

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Passive Double 10 Inch Proal Audios Sound System Line Array Speakers for Direct Sale$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.Dual 10inch Professional PRO Audio Speaker System, 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%)10 " PRO Audio DJ Line Array Speaker Equipment System. 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.Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder. Moreover,Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System, 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% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6), maintenance (China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole), 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,Big Outdoor Sound Equipment Active Dual 8" Line Array Speaker), and annual cost index of mineral processing equipment.Professional Powered Line Array Selfpowered Speakers Active System, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,MBN1503 PA Woofer . Maximum MAER of 13.5% and minimum R²of 0.Best Quality BMK Glycidate Raw Materials Fororganic Intermediates Bulk Price-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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