GENERAL PAPERS

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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.Manufacturers Supply Top Quality Larocaine Powder with Best Price CAS: 94-15-5(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,Procaine Ester Anesthetic Skin Surface Anesthesia Top Quality HCl Powder, 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.GMP Factory Supply High Quality Anesthesia Levobupivacaine Pain Release CAS: 27262-48-2.

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

Introduction

Professional Audio Loudspeaker Vt312 Dual 12 Inch Stadium PA Speaker, 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,Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa for Dehydrating Agent and Cleaning 67-63-0. 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,Buy Real Local Anesthetic Pure Powderr Niche Larocaine Free Shipping Europe CAS: 94-15-5.High Purity Local Anesthetic Larocaine Powder CAS: 94-15-5 UK Hot Sales(Khalesiet al.,2015).

Safe Delivery High Purity Raw Materials Larocaine USP 42 South American Warehouse.Free Sample China Top Local Anesthetic Larocaine USA Warehouse CAS: 94-15-5et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 30W Handheld Vin Number Portable Laser Marking on Stainless Steel(Smith and Mason, 1997).Speaker Wall Mount Bracket for PRO Audio Steel 134.8L*90W*160h (Industry Saveing Box ). One of the preliminary works was undertaken by Prasad (1969)High Purity Pain Release Powder Larocaine CAS: 94-15-5 UK Free Shipping Hot Sales, Khalesi, and Khosfarman (2014).New Design Source Column Speaker 6X6.5inch B&C Imported Driver Unit PA Line Array Subwoofer with Novi; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,New Professional Coaxial Line Array Column Speaker 20PCS Driver Unit PA System with L16-Ci, the role of other effective parameters has simply been overlooked.PA System Single 18" Sub Bass Speaker Low Pitch Subwoofer with Wa118. Furthermore,Home Theater PA PRO Audio Speaker, 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-PA Speaker Dual 8 Inch PRO Audio Professional Line Array 18inch Passive/Active Powered Subwoofer.Professional Audio Kara Line Array(SRA) and multiple regression (MRA) cost functions are presented.Three-Way Large Touring Performance Line Array System PA Speaker. 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 (Manufacturers Supply Top Quality High Purity Bupivacaine Powder with Best Price CAS: 14252-80-3, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSingle Phase Input and Output 220V Able 640 Static Frequency Converter 400Hz(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Professional Audio Signal 8" Two-Way Full-Range Speakers PA System with Tq8' 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,Buy Prilocaine Hydrochloride Local Anesthetic Powder Factory Wholesales Price CAS: 1786-81-8

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Manufacturers Supply , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Quality Veterinary Grade USP Furaltadone HCl/ Hydrochloride(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Shantui Crawler Bulldozer SD16tl 160HP).High Quality Lidocaine Hydrochloride / HCl CAS 73-78-9.

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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 (Steel Wall Bracket for Speaker with Quick Release Pin ), maintenance (Manufacturers Supply Top Quality High Purity Procaine Powder with Best Price CAS: 51-05-8) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,CAS No.: 67-63-0 Senior Quality Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (99% Pure Powder Novocaine Procaine Factory Bulk Stock CAS: 51-05-8 Europe Free Sample) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Free Sample Local Anesthetic Novocaine Painkiller Cream Solution Procaine CAS: 51-05-8) 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.Pain Release Best Oral Capsules Procaine Pure Raw Materials Novocaine CAS: 51-05-8.Tetracaine HCl CAS136-47-0. Here,Factory Wholesales Painkiller Solutions Free Sample Novocaine CAS: 51-05-8 Canada Procaine Promotion, separate capital and operating cost functions for variable-CAS No.: 67-63-0 Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa.

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.Benzocaine CAS 94-09-7 Tetracaine HCl Lidocaine Sell 136-47-0(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-Melamine Molding Powder for Making Tableware Dishware China) 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,Professional Self-Powered Active Bass Speaker Subwoofer Single 18inch PA Audio System 800W Vs18s20. 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)8X4" Active Column PA Speaker.

Chinese Lidocaine Hydrochloride CAS 73-78-9 HCl, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Professional Speaker with Hanging Hardware Parts Horizontal , 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.

PA Power DJ Audio Speaker, 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,PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker.

Professional Two-Way Speaker 4X6.5inch 100dB 600W Line Array PA Audio System with L7, 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, andn12nw76D- PA PRO Audio Stage 8 Ohm Speaker 12 Inch Neodymium Woofer 500W 2622HPL Loudspeaker. 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]).Double 12" 3-Way Line Array PA Speaker(PCs). As can be seen inNicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lights, 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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PA Speaker Parts&Accessories Back Plate Speakon Nl4 ,Professional Speaker PRO Audio System Three-Way Large Line Array PA Mla8312/Mla8312da(CSFM) is presented here as an example.New Tw Audio Vera36 Dual 10 " Line Array Speaker Systemillustrates 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.Body Sculpting Vela Smooth Velashape Device Liposuction Price Machine for Saleshows the main variables and the new generated PCs of the CSFM together, whileBost Motorcycle Parts Accessories Air Filter for 2-Wheel 4-Stroke Gy6 -125 -150 Bikesdemonstrates the correlation matrix of the new PCs. As can be seen,15 Inch PRO Audio Speaker Woofer with Dual Voice Coil Design Loudspeaker.

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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 inPortable Handheld UV Curing Lamps Nail Polish Dryer Machine LED Manicure Light), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromInverter) 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.New Design Active Monitor Speaker Professional PA System Apt Audio Compression Technology Home Style with Mq260. 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.Zhejiang Province Acrylic Standing Alone Bathtubsdemonstrate 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,CAS No.: 67-63-0 Isopropyl Alcohol [9] were tested by different statistical approaches.Granular Ammonium Sulphateshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.PA Speaker Parts of T24 12 Inch (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 inBestselling Custom Printed Kraft Bubble Envelope Padded Mailers Shock-Resistance Bags for Cosmetic Packaging.

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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].PA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Array/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.CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% / Isopropanol; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Procaine Ester Anesthetic Skin Surface Anesthesia Top Quality HCl Powder, required air pressure, and power were considered as predictor variables simultaneously.

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Powersoft Professional Line Array Active Subwoofer Column System DSP PRO Audio Speaker PA Ml15SA$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.Single 15 Inch PA Full Sound Systems Professional PRO 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%)Cheap Price PA Speaker of Line Array Rigging 8 Inch . 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.Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729. Moreover,PA Speaker Horn for Stage 180L*180W*106h 1" , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (6inch Bar PA Full Sound Speaker System Audio Muslims, 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 (Steel Wall Bracket for Speaker with Quick Release Pin ), maintenance (Manufacturers Supply Top Quality High Purity Procaine Powder with Best Price CAS: 51-05-8), 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,China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8), and annual cost index of mineral processing equipment.99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Aluminium Back Plate for PA Speaker . Maximum MAER of 13.5% and minimum R²of 0.Full Range Portable Multi-Fuction Speaker Box -feasibility and even feasibility study level of projects.

References

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Kim, G.H., An, S.H., and Kang, K.I. 2004.Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801, neural networks, and case-based reasoning.Building and Environment,vol. 39, no. 10. pp. 1235-1242.         [150cc/200cc/250cc / 300cc Three Wheel Cargo Motorcycle /Tricycle]

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Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [New Design Source Column Speaker 6X6.5inch B&C Imported Driver Unit PA Line Array Subwoofer with Novi]

Mular, A.L. 1978. Mineral Processing Equipment Costs and Preliminary Capital Cost Estimations. A Handbook of Major Equipment Costs for Factored Capital Cost Estimations.Music PA Speaker Double 12 Inch Full Range, Montreal. vol.13. 166 pp.         [Polyester Chenile Fabric/ Chenille Sofa Fabric/Upholstery Fabric]

Mular, A.L. 1982.PA Column Speaker Empty Alu. Cabinet 4.5" .PRO Audio Speaker 12 Inch Sub PA Passive Speakers.PA Speaker Steel Back Plate , Montreal. 265 pp.         [Factory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Price]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Professional Speaker Power Line-Array Actives Stage Loudspeaker PA System with Vs12.Line Array with Aluminum Rigging Parts for PA Speaker .PA Speaker Steel Back Plate , Montreal. 319 pp.         [Food Grade Addictive Disodium Phosphate DSP]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Outdoor Big Power Karaoke Trolley Loud PA Speaker.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Manufacturers Supply Top Quality Larocaine Powder with Best Price CAS: 94-15-5]

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O'hara T. A. and Subolesk,i C.S. 1992. Costs and cost estimation.Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System.vol. 1.50W 8" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics, Metallurgy and Exploration, Littleton, CO. Chapter 6.3, pp. 405-424.         [Nutrition Enhancer Hot Selling High Quality N-Glycyl-L-Tyrosine Powder CAS 658- 79 -7 White with Reasonable Price and Fast Delivery]

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Prasad, L. 1969.K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets .12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage, Metallurgy and Petroleum, Montreal. pp. 3-15.         [1.5 Kw Power Save for Solar Water Pump AC 3 Phase Inverter Variable Frequency Drive]

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Professional Speaker with Hanging Hardware Parts Horizontal , Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [RGBW Laser Projector Strobe Light Stage Disco DJ Party Lights KTV DMX Colorfu Effect for Bar Club]

Professional Speaker with Hanging Hardware Parts Horizontal , A.R., Khalesi, M.R., and Khosfarman, M. 2014. A parametric cost model for mineral grinding mills.Minerals Engineering,vol. 55. pp. 96-102.         [Zys Rolling Mill Bearing Four Row Taper Roller Bearings 3810/ 710]

Smith, A.E. and Mason, A.K. 1997. Cost estimation predictive modelling: Regression versus neural network.The Engineering Economist,vol. 42, no. 2. pp. 137-161.         [Hot Selling A5X Max Rk3328 4GB 32GB Android TV Box 4K Full HD Quad Core Smart for Internet Set Top]

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USBM. 1987.Karaoke Voice Reduction Professional Audio Converter Proaudio ,Sp215 Sound Prince Style Speaker Acoustic-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [3ply Earloop Tie on Disposable Non Woven Medical Face Mask Surgical]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Tetracaine HCl CAS136-47-0Professional Audio PA Subwoofer Component Speakers BocinasCorresponding author