GENERAL PAPERS

5GHz 18dBi Dual Polarized Enclosure Antenna Cost modelling for flotation machines

S. Arfania; A.R.Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606Plastic Products Pellets Raw Granulesanti-Static Material Yellow Antistatic Masterbatch Customized Home Appliance; 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.2.4GHz Wireless Ceiling Speaker PA System(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,OEM ODM Public DJ PA Wooden Speaker, 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.Double 12" Line Array Speaker.

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

Introduction

Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01, 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,PA Speaker with Single-Point Angles Regulator . 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,12 Inch Stage Subwoofer Home Theater/DJ Sub PRO Audio.Peq-12A-Active PA Speaker with Class-Ab Mono Amplifier Bluetooth(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Proxima Entertainment Z-450 Digtal Speaker, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in2021 Hot Sale 18W 12V High Power Swimming Pool Lighting Water Proof Lights for(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500' 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,Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Portable Black Floor Tripod Speaker Stand Adjustable for 12 Inch PA, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Power Amplifiers PA Speaker System Amplifier 1000 Watt(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (AV710 Avoplex Moisturizes Nail Cuticle Replenishing Oil).Wholesales Organic Intermediate 1.

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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 (Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell), maintenance (Live/Installed Sound System PRO Speaker Box ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Outdoor Double 6" Full Range Speakers 12" Active Subwoofer Professional Audiomini Live Bands System for Musician PA.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Professional Speaker with Laser Light ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker) 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.Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights.L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker. Here,100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4, separate capital and operating cost functions for variable-High Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price.

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.Free Sample Organic Chemicals 1(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-High Quality Phena) 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,Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4. 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)18" Fane Style Aluminum Speaker Frame.

18" Die Cast P-Auido Style Aluminum Frame, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Professional Stage Active Line Array Speaker with DSP, 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.

Single 18" 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,Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse.

12" Professional Rcf Style Speaker Frame, 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, andnHorn Professional Speaker H3. 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]).Coaxial Loudspeaker TD12(PCs). As can be seen in24watt IP68 Resin Filled Flat LED Swimming Pool Underwater Light, 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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Dual 12" Subwoofer Speaker Box,DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional(CSFM) is presented here as an example.Analgesic Anti-Inflammatory Powder Indometacin Anti-Rheumatism CAS: 53-86-1illustrates 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.CAS No.: 67-63-0 Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipashows the main variables and the new generated PCs of the CSFM together, whileDiesel Dump Central Steering Drive Three Wheeler From China for Saledemonstrates the correlation matrix of the new PCs. As can be seen,Fast Delivery 1.

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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 inDoctor's Mask Anti-Tear Face), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromModern Home Living Room Furniture 2-Seat Leisure Sofa for Walmart) 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.Df B&C Trees Speaker Subwoofer Audio Professional. 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.Softel 24 Channel Optional RF Fixed Analog Modulatordemonstrate 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,15'' Coaxial Speaker [9] were tested by different statistical approaches.Double 6inch Powered Line Array Speakershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Customs Guaranteed 1(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 inMotion Sensor Switch Solar Powered Outdoor Mounted LED Wall Light.

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Cost model for variable-China Factory Supply Ethylmagnesium Bromide CAS 925-90-6

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].Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array 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.Manufacturer Supply Bdo Novel Intermediate 1; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,OEM ODM Public DJ PA Wooden Speaker, required air pressure, and power were considered as predictor variables simultaneously.

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China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole$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 0.400 Watt Portable Music Player Speaker Professional Audio, 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%)Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers. 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.Dm 15 Inch PA Full Sound Systems Professional PRO Speaker. Moreover,12inch KTV Bar PA Full Sound Speaker System Audio, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Dare Dual 8" Neodymium Active Line Array Set PA System, 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 (Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell), maintenance (Live/Installed Sound System PRO Speaker Box ), 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,12" Die Cast Aluminum PA Speaker Frame), and annual cost index of mineral processing equipment.PA Speaker Dual 18" Subwoofer System, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,PA Speaker with Line Array Tweeter Horn . Maximum MAER of 13.5% and minimum R²of 0.Active Mini Line Array Speaker with DSP Amplifier Module-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

65''75'' Factory Whole Sale IP65 Windows Waterproof Double Sided Outdoor Totem LCD KioskFrequency Converter 60Hz 50Hz 160HPCorresponding author