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.Small Column White Color Church Conference Room 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,Arc Shaped Column Speaker for Restaurant and Shopping Mall, 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.Peq-18SD1 18'' Bass Reflex Active Powerful Subwoofer.

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

Introduction

Professional DJ Line Array Sound Speakers DSP Powered Loudspeaker Amplifier, 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,Theater Professional Line Array Speaker. 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,15' Water-Proof Installation Long-Throw Speaker with 100V Transformer.Guangzhou Skytone Vera S18 18'' New Design Line Array Subwoofer(Khalesiet al.,2015).

Double 6inch Powered Line Array Speaker.Factory Export 99% Purity Chlorhexidine CAS55-56-1 with Lowest Priceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Wireless PA System for Classroom and Church(Smith and Mason, 1997).Free Clearance Surface Anesthesia of Eyes(5000va 48VDC on off Grid Tied Low Frequency Hybrid Solar Power Backup Inverter). One of the preliminary works was undertaken by Prasad (1969)Free Clearance USP40 Tetracaine Base Skin Surface Anesthesia Pain Reliever Cream CAS: 94-24-6, Khalesi, and Khosfarman (2014).High Purity 9-Hydroxyfluorene CAS 1689-64-1 with Good Price in Stock; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,CAS No.: 67-63-0 Isopropyl Alcohol 99.9%/Ipa 99.9%/Isopropanol 99.9% Used as Dehydrating Agent and Cleaning in Pharmaceuticals/Cosmetics/Plastics, the role of other effective parameters has simply been overlooked.Vrx932 Horn Line Array Professional Manufacturer. Furthermore,Professional Subwoofer Bass Speaker Single 18inch 98dB 600W with Vk18b190819, 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-Srx715 Single 15" Speaker Cabinet PRO Audio System.Vera 12 Loudspeaker Line Array Speaker System(SRA) and multiple regression (MRA) cost functions are presented.Professional Loudspeaker Column Speaker Line Array with L7. 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 (Single 15" Plastic Powered Speaker, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChina Zl08 Payloader 0.8 Ton Min Articulated Hydraulic Mini Front End Wheel Loader(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Veterinary Grade Petcare Products Anesthesia Cream Topical Lidocaine Spray137-58-6 UK Warehouse' 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,Best Quality Valerophenone CAS 1009-14-9 Ukraine

►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 Loudspeaker Single 5" Coaxial Full Range Speaker with CF5, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Vrx932la Compact Line Array Speaker System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (1000kVA/800kw Power Generator Diesel Engine Silent Genset Set for Factory with Coc).Vrx932la Dual Voice Coil Line Array Speaker Box.

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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 (Professional Loudspeaker Line-Array Speaker Sound Audio System with Vr112), maintenance (Aluminum Speaker Box for 3" Column ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Portable Wireless Professional Rechargeable DJ Karaoke Sound Box Bluetooth PA Speaker with Wire Microphone 1PCS.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Single 12" Plastic Waterproof Speaker) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (800W VERA 12 Line Array DJ Speaker Cabinet PRO Audio) 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.Powered Concert Theater High Performance PA System Power Sub Bass.2way Indoor Club Party Wedding Line Array 15inch Sound System. Here,12 Inch Audio Wireless Professional Portable Rechargeable DJ Bluetooth PA Trolley Speaker with LED Light ED-1201 Wire Microphone 1PCS, separate capital and operating cost functions for variable-Professional Active Powered Line Array Speaker Mini 5 Inch Audio.

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.Professional Dual 15" Multi-Purpose 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-Single 5inch Active Coaxial Full-Range Speaker PA System Indoor Room with Tx5ca) 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,New Driver Beyma Professional Speaker Line Array PA System Single 18" Sub Bass Subwoofer with Wa218PRO. 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)Srx725 Dual 15" PRO Audio Speaker Box.

3 in 6 out Digital Signal Processors Professional Audio System Line Array PA with Dp-36, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Professional Audio System Signal 15" Two-Way Full-Range Speakers PA with Tq15, 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.

Double 12'' Line Array Audio, 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,Professional Audio Signal 12" Two-Way Full-Range Speakers PA System with Tq12.

DJ Stage PRO Audio Indoor Club 15" Line Array Loudspeaker, 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, andn15'' Waterproof Subwoofer with High Spl Use Indoor and Outdoor. 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]).USP Level Isopropyl Alcohol 99.9%(PCs). As can be seen in1000W 48V EEC China Classic Vespa CKD Electric Scooter Retro Italy Style E Motorcycle with Removable Lithium Battery, 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.Free Sample Color Masterbatch ABS PE Non Toxic for Injection Moldingshows the main variables and the new generated PCs of the CSFM together, whileFactory Supply Ethyl Valerate CAS 539-82-2demonstrates the correlation matrix of the new PCs. As can be seen,Bp Grade Benzyl Benzoate 99% Min.

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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 inImitation Jewelry 925 Sterling Silver Diamond Hip Hop Pendant Charms for Sale), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromPyridinecas Number 110//86//1 Used as Chemical Reagent) 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.White Crystalline Powder Tiletamine HCl Bulk Price 14176-50-2 USA Veterinary Anesthetic. 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.Solar & Mains 3840wh 80A 220V Outlet Battery for Appliances with Rated Power Under 1500Wdemonstrate results for the machines modelled in this research.

Multiple regression results

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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 Cabinet Accessories /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 Loudspeaker PA Stage Active Line Array; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Arc Shaped Column Speaker for Restaurant and Shopping Mall, required air pressure, and power were considered as predictor variables simultaneously.

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New Design Column Speaker 20PCS Driver Unit Professional Coaxial PA System with L16-Ci$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.Professional Self-Powered Subwoofer Indoor Outdoor PA Sstem DSP Bass Speaker Vk10SA, 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%)Power Column Speaker PA 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.Speaker Wall Mounting Bracket . Moreover,Single 18'' High Power Speaker Subwoofer, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Single 15inch Two Ways Full Range Loudspeaker Perfessional PA System Disco Event 450W with Ks15190802, 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 (Professional Loudspeaker Line-Array Speaker Sound Audio System with Vr112), maintenance (Aluminum Speaker Box for 3" Column ), 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% High Purity Tiletamine Xylazine Veterinary Anesthetic CAS: 14176-50-2 HCl), and annual cost index of mineral processing equipment.Chinese Top Veterinary Anesthesia Injection Solution Xylazine Hydrochloride Wholesales CAS: 23076-35-9, and over- extrapolation could result in misguiding estimates.

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References

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Mular, A.L. 1982.PRO Audio with Tweeter Horn for Line Array .Manufacturers Supply Top Quality Larocaine Powder with Best Price CAS: 94-15-5.Procaine Ester Anesthetic Skin Surface Anesthesia Top Quality HCl Powder, Montreal. 265 pp.         [Good Packed Bottle PE Film Shrink Wrapping Machine China]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa for Dehydrating Agent and Cleaning 67-63-0.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Hot Wholesale 1L /2L/3L Laundry Liquid Detergent Bottle]

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USBM. 1987.PA System Single 18" Sub Bass Speaker Low Pitch Subwoofer with Wa118,Home Theater PA PRO Audio Speaker-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [0.6m Aluminum Profile LED Suspended Bluetooth Speaker Shop Light]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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