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.180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820(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,4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio, 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.Alu. Speaker Mount Wall Bracket .

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

Introduction

Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTV, 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 Quality 8'' Coaxial Audio Speaker for Long Throw Distance. 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,Wall Mount Speaker Bracket .Professional Outdoor Speaker All Weather Water-Proof Humidity Proof Functions Two Ways with Mq6tp190801(Khalesiet al.,2015).

Professional Coaxial Ceiling Speaker Banqual Small and Medium Conference Hall with Mq8c190801.Waterproof Loudspeaker Wall Mounter 8inch Lt208/Lt208tet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Nicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lights(Smith and Mason, 1997).Wireless PA System for Classroom and Church(Titan Brand 0.8 Ton Farm Garden Use Mini Smalll Wheel Loader for Sale). One of the preliminary works was undertaken by Prasad (1969)All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf, Khalesi, and Khosfarman (2014).Steel PRO Audio Speaker Back Plate ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Hop Quality and Competitive Price Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa, the role of other effective parameters has simply been overlooked.Single 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730. Furthermore,Dual 8inch Two-Way Line Array Loudspeaker Bi AMP B&C Speaker Unit Ease Function with Vk20819729, 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-All-Weather Compact 2-Way Coaxial Loudspeaker with 6" Lf.Novel Pea Supplements Eria Jarensis Extract Palmitoylethanolamide Raw Powder USA Stock CAS: 10275-21-5(SRA) and multiple regression (MRA) cost functions are presented.Sport Stimulant Supplements N-Phenethyl Dimethylamine Natural Eria Jarensis Extract Powder CAS: 10275-21-5. 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 (Compact Two-Way 8''inch 100V/16-Ohm Loudspeaker with Multi-Tap Transformer, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNitrogen Fertilizer N21% Min Ammonium Sulphate White Granular(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Speaker PS10' 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,Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Two-Way Full Range 1000W Professional Power Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Automatic Plywood Production Line).Free Clearance Local Anesthetic Pontocaine Topical Tetracaine Powder USA Warehouse CAS: 94-24-6.

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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 (China Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149), maintenance (Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouse) 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 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Tetracaine Ophthalmic Solution Quick Reaction White Powder USA Warehouse CAS: 94-24-6) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Single 5"Two-Way Full-Range Loudspeaker Small Scale Indoor with Tx5c) 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.High Qualty Line Array Loudspeaker.DSP Active Line Array Speaker. Here,Neodymium 12inch 932lap Professional Powered DSP Line Array Speaker, separate capital and operating cost functions for variable-8in 8out Professional DSP Matrix Digital Audio Processors with Dp-0808date20.

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.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1220(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-New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx820) 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,Recording Studio Equipment Vera Series Super Power Speaker Box. 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)New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx620.

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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.

Line Array Horn of Professional Audio 170L*160W*140h 1" , 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,Single 18'' Low Frequency Sub-Bass.

Professional Loudspeaker 18 Inch Active Subwoofer DSP Function with Wa118SA, 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, andnOutdoor PRO Audio 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]).Doule 8'' Mini Line Arry Loudspeaker(PCs). As can be seen inNew Driver Beyma Professional Speaker Line Array PA System Single 18" Sub Bass Subwoofer with Wa218PRO, 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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Vera12 New Design 800watts 12" Audio System Line Array,Single 15 Inch High Quality Bass(CSFM) is presented here as an example.Motorcyle for Both Oil and Water Coolingillustrates 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.Hot Sale 60V 800W Brushless Motor Two Wheel Electric Motorcycleshows the main variables and the new generated PCs of the CSFM together, whileChina Factory Supply Good Quality Polyamide Resin PAdemonstrates the correlation matrix of the new PCs. As can be seen,Professional Audio Speaker Column Sound Equipment.

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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 inMainframe and Large Motor), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromPerkins Genuine Cyl Cylinder Head Cover Assy 4142X402 for Industrial Diesel Engines) 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.Srx715 Sing 15" Professional Speaker. 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.CAS No.: 63428-84-2 Polyamide Resindemonstrate 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,Aclon DSP3500 Professional DJ Sound Speakers DSP Powered Line Array[9] were tested by different statistical approaches.Hot Sale 10kw 10000W off Grid Solar Power System Home Useshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Small Column White Color Church Conference Room Speaker(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 in0-10V and 1-10V attenuation power supply from 100V to 130V AC constant voltage input 24V 150W 6.25A thin LED controller.

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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].Peq-18SD1 18'' Bass Reflex Active Powerful Subwoofer/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 DJ Line Array Sound Speakers DSP Powered Loudspeaker Amplifier; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio, required air pressure, and power were considered as predictor variables simultaneously.

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Guangzhou Skytone Vera S18 18'' New Design Line Array Subwoofer$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.Double 6inch Powered Line Array 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%)Factory Export 99% Purity Chlorhexidine CAS55-56-1 with Lowest Price. 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.Free Clearance Surface Anesthesia of Eyes. Moreover,Free Clearance USP40 Tetracaine Base Skin Surface Anesthesia Pain Reliever Cream CAS: 94-24-6, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Purity 9-Hydroxyfluorene CAS 1689-64-1 with Good Price in Stock, 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 (China Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149), maintenance (Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouse), 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,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), and annual cost index of mineral processing equipment.Vrx932 Horn Line Array Professional Manufacturer, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Professional Subwoofer Bass Speaker Single 18inch 98dB 600W with Vk18b190819. Maximum MAER of 13.5% and minimum R²of 0.Srx715 Single 15" Speaker Cabinet PRO Audio System-feasibility and even feasibility study level of projects.

References

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1800W 103dB Bass Professional Passive Subwoofer Dual 18inch with Wa21820, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Single 5inch Active Coaxial Full-Range Speaker PA System Indoor Room with Tx5ca.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [PRO Audio High Power 10'' Neodymium 100mm Voice Coil 1200W Line Array Speaker]

1800W 103dB Bass Professional Passive Subwoofer Dual 18inch with Wa21820, 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.         [Outdoor Custom Skate Carry Laptop Sports Bag Skateboard Backpack]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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