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S. Arfania; A.R.12 Inch Stage Subwoofer Home Theater/DJ Sub PRO AudioCvr 2021 New 10'' Line Array Professional; 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.Peq-12A-Active PA Speaker with Class-Ab Mono Amplifier Bluetooth(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,Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2, 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.CAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%.

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

Introduction

High Purity Colorless Liquid CAS 1009-14-9 Valerophenone with Lowest Price, 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,Pharmaceutical Intermediate Bulk Price N- . 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,Cinnamaldehyde CAS 104-55-2 Cinnamic Aldehyde Factory Supply.Einecs No. 200-661-7/Ipa Is a Colorless Transparent Liquid/Large Output to Meet Supply Demand(Khalesiet al.,2015).

Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl.Speaker System High Power H3et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price(Smith and Mason, 1997).CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical(24watt IP68 Resin Filled Flat LED Swimming Pool Underwater Light). One of the preliminary works was undertaken by Prasad (1969)Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4, Khalesi, and Khosfarman (2014).500W Powered Speaker Professional Sound Line Array System ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Proxima Entertainment Z-450 Digtal Speaker, the role of other effective parameters has simply been overlooked.Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500. Furthermore,Lat210A Srx700 Series PA Sound System Professional Speakers, 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-Professional Public Address Mini Onwall Line Array Speaker .Q1--Dual10 Inch Line Array Speaker(SRA) and multiple regression (MRA) cost functions are presented.12inches PA Speaker Audio Component. 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 (Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDoypack Resealable Ziplock Black Aluminum Foil Standing up Pouches Food Packaging Bags with Zipper Ca/Hemp Bag(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Portable Black Floor Tripod Speaker Stand Adjustable for 12 Inch PA' 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,Outdoor Double 6" Full Range Speakers 12" Active Subwoofer Professional Audiomini Live Bands System for Musician PA

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Professional Speaker with Laser Light , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Nylon IEC IP44 220V Industrial Plug and Socket).Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights.

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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 (L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker), maintenance (100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Free Sample Organic Chemicals 1) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (High Quality Phena) 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.Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4.18" Fane Style Aluminum Speaker Frame. Here,18" Die Cast P-Auido Style Aluminum Frame, separate capital and operating cost functions for variable-Professional Stage Active Line Array Speaker with DSP.

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.Single 18" Subwoofer Speaker Box(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-Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse) 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,12" Professional Rcf Style Speaker Frame. 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)Horn Professional Speaker H3.

Coaxial Loudspeaker TD12, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (18'' Subwoofer Speaker Box Ls1200, 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.

Dual 12" Subwoofer Speaker Box, 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,DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional.

Fast Delivery 1, 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, andnProfessional Speaker Box F12+. 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]).Df B&C Trees Speaker Subwoofer Audio Professional(PCs). As can be seen inCAS No.: 67-63-0 Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa, 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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Customs Guaranteed 1,China Factory Supply Ethylmagnesium Bromide CAS 925-90-6(CSFM) is presented here as an example.Factory Price Agricultrue Fertilizer with Caprolactam Gradeillustrates 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.30% to 50% Carbon Content PP Application Making Plastics Product Filmshows the main variables and the new generated PCs of the CSFM together, whileModern Home Living Room Furniture 2-Seat Leisure Sofa for Walmartdemonstrates the correlation matrix of the new PCs. As can be seen,Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speaker.

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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 in50 Inch Curved TV 4K Smart Television), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromDouble 6inch Powered Line Array Speaker) 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.Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro. 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.Lat210A Srx700 Series PA Sound System Professional Speakersdemonstrate 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,99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6[9] were tested by different statistical approaches.Loudspeaker 10'' Midrange & Bassshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole(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 in12 Inflatable Dinosaur Costume.

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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].Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers/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.Dm 15 Inch PA Full Sound Systems Professional PRO Speaker; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2, required air pressure, and power were considered as predictor variables simultaneously.

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12" Die Cast Aluminum PA Speaker Frame$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.PA Speaker Dual 18" Subwoofer 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%)PA Speaker with Line Array Tweeter Horn . 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.Active Mini Line Array Speaker with DSP Amplifier Module. Moreover,Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Quality Karaoke Loudspeaker with B&C Compression Driver, 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 (L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker), maintenance (100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4), 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,99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0), and annual cost index of mineral processing equipment.Factory Supply BMK Powder Glycidate CAS: 5413-05-8, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone. Maximum MAER of 13.5% and minimum R²of 0.Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder-feasibility and even feasibility study level of projects.

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Mular, A.L. 1982.Trolley Large Audio Loudspeaker Box Professional Stage Active PA Speaker.BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6.Portable 15inch PA Speaker F15+, Montreal. 265 pp.         [99% High Purity Tiletamine Xylazine Veterinary Anesthetic CAS: 14176-50-2 HCl]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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