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.Hot Selling Powder Thiabendazole CAS 148- 79 -8(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,High Quality Coffee /Candy/Weed Plastic Container, 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.Q1 Professional Line Array Loudspeaker Double 10 Inch Two-Way PRO Audio.

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

Introduction

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Methodology

Data

Thirty-seven major flotation machines (High Purity O-Phthalaldehyde, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inin Line Direct Injection Diesel Engine Used for Generator Set(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;PRO Audio Dual 10 " 900W Sound System Perfect Line Array Active Speaker' names:

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►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Hrk Provide Topiramate Powder Price CAS 97240- 79 -4, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Speaker 2way Double 10inch Full Range High Power Neodymium Speakers Line Array (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Digital High Voltage Vacuum Switch Degree Tester).China 10 " DJ Indoor/Outdoor Audio Sound System Line Array Speakers .

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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 (Dual 10 " Professional Home Sound Mini Concert Karaoke Party System Mobile Trolley Battery Active Stereo Audio Speaker with DJ Light+Remote Control+Bt), maintenance (China Hot Sale Professional Speaker Dual 10 Inch Line Array) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,10 " Plywood Professional DSP Active Speaker .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Top Quality CAS 643- 79 -8 O-Phthalaldehyde) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (High Quality Chemical Product 4- ) 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.Bluetooth Speaker Indoor Outdoor Party Sound 10 Inch Active Arrray System.Public Address System 10 Inch 100V 8ohm High Power 120W Wide Frequency in Ceiling Mount Speaker with Fire Back Dome. Here,Pharmaceutical Raw Material CAS 104376- 79 -6 Ceftriaxone Sodium Sterile White Powder, separate capital and operating cost functions for variable-Dual 10inch Powerful Line Array Speaker Ds210.

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.Hot Sale Free Sample CAS 302- 79 -4 Retinoic Acid with Best Quality(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-Dual 10 Inch Top and Double 15 Bass Portable Multi-Functional Line Array Speaker System) 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,Cheap Price PRO Sound Professional Audio 10 Inch Speakers 200W. 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)Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease with Fast Delivery.

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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.

10 Inch Coaxial Speaker Professional Driver 250wrms " Subwoofer, 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,Aicrowe L- .

Diase PRO Audio Dual 10inch Professional Line Array 700W, 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, andnPS10 High Power 10 Inch Monitor PA Speaker for Live Performance. 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]).Mylar Food Grade Moisture Proof Tea Foil Lined Packaging Stand up Bag Thin Kraft Paper Bags for Packing Coffee Snack Pouches(PCs). As can be seen in99% Pure Powder Novocaine Procaine Factory Bulk Stock CAS: 51-05-8 Europe Free Sample, 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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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.Jwell Plastic PVC Foamed Frame Profile Extrusion Machineshows the main variables and the new generated PCs of the CSFM together, whileWater Pumping AC Variable Frequency Drive Solar Pump Inverter for Submersibledemonstrates the correlation matrix of the new PCs. As can be seen,10AA50-1 RMS 200 Watts 10 Inch Full Range Woofer with.

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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 inSea Shipping Service From China to Bruxelles by DAP), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromAntique Design Rustic Style Furniture Wax Brown Oak Leg Cream White Linen Fabric Cushions Four Seats Sofa) 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.Plastic Laminated Bio Black White Craft Zipper Yemek Paketleme Paper Kraft Packaging Ziplock Bags for Coffee Food. 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.Ex200-1/2/3/4/5 Arm Cyl Oil Seal Kit for Hitachidemonstrate 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,Food Grade Lactic Acid 79 -33-4[9] were tested by different statistical approaches.Health Raw Material Dibasic Sodium Phosphate CAS No.: 7558- 79 -4 with High Qualityshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Wholesale Top Quality Retinoic Acid/Retinoic Acid Powder/Tretinoin Powder/Vitamin a CAS 302- 79 -4(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 inVafuntea Papaya Hip Lift Oil.

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Cost model for variable-10 " Inch Speaker System PRO Audio Entertainment Speakers

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].10 -50W 6.5 Inch PA Sound Ceiling Speaker/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.Professional Audio Speaker Double 10 Inch Line Array ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality Coffee /Candy/Weed Plastic Container, required air pressure, and power were considered as predictor variables simultaneously.

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Dual 10 Inch 600W High-End Stage Line Array PRO Audio$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.Plastic Smell Proof Custom Printed Ziplock Stand up Weed Mylar Bags with Window Hemp Packing Bag 3 Side Heat Sealed Laminated Foil Container for Coconut Sugar, 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%)Child Resistant Stand up Exit Bag. 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.Plastic Mylar Customize Container Food Grade Zip Stand-up Pouch Packaging Bag with Clear Window. Moreover,Single 10 Inches Passive/Active Full-Range Professional Loudspeaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Custom Zip Bag Plastic Stand-up Pouch Sweet Child Proof, 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 (Dual 10 " Professional Home Sound Mini Concert Karaoke Party System Mobile Trolley Battery Active Stereo Audio Speaker with DJ Light+Remote Control+Bt), maintenance (China Hot Sale Professional Speaker Dual 10 Inch Line Array), 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,Combo Speaker Professional Loudspeaker /Doule 10'' Line Array System), and annual cost index of mineral processing equipment.PRO Audio Speaker Dual 10 Inch Professional DSP Active Line Array, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,10 " Professional Stage Performance Audio PA Trolley Wireless Bluetooth Active Speaker. Maximum MAER of 13.5% and minimum R²of 0.Single 10 Inch 2 Way Mini Portable Line Array Speaker-feasibility and even feasibility study level of projects.

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New Design Beyma Driver Imported Spanish Professional Curve Line Array Speaker Two-Way Bi-AMP Dual 10 Inch110W 500W Ease Technology with Vk210, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Professional Loudspeaker 10'' PRO Audio Speaker Passive Line Array System.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [8 Channels HDMI to DVB-T Modulator]

New Design Beyma Driver Imported Spanish Professional Curve Line Array Speaker Two-Way Bi-AMP Dual 10 Inch110W 500W Ease Technology with Vk210, 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.         [Lrs-75-12 75W 12VDC 6.5A Thin]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Mini Wireless Stereo Tws 5.0 Music Earphone L18Frequency Converterlow Industrial Power InverterCorresponding author