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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.Professional Speaker with Laser Light (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,XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment 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.Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights.

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

Introduction

L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array 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,100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4. 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,High Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price.Free Sample Organic Chemicals 1(Khalesiet al.,2015).

High Quality Phena.Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Face Veneer Nature Bamboo for Fancy Plywood(Smith and Mason, 1997).18" Fane Style Aluminum Speaker Frame(5GHz 29.5dBi Die Cast Grid Antenna). One of the preliminary works was undertaken by Prasad (1969)18" Die Cast P-Auido Style Aluminum Frame, Khalesi, and Khosfarman (2014).Professional Stage Active Line Array Speaker with DSP; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Single 18" Subwoofer Speaker Box, the role of other effective parameters has simply been overlooked.Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse. Furthermore,12" Professional Rcf Style Speaker Frame, 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-Horn Professional Speaker H3.Coaxial Loudspeaker TD12(SRA) and multiple regression (MRA) cost functions are presented.18'' Subwoofer Speaker Box Ls1200. 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 (Dual 12" Subwoofer Speaker Box, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in2021 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speaker(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Refrigeration Freezer Cold Room with Bizer Condensing Unit).Manufacturer Supply Bdo Novel 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 (Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro), maintenance (99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (400 Watt Portable Music Player Speaker Professional Audio) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers) 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.Dm 15 Inch PA Full Sound Systems Professional PRO Speaker.12inch KTV Bar PA Full Sound Speaker System Audio. Here,Dare Dual 8" Neodymium Active Line Array Set PA System, separate capital and operating cost functions for variable-12" Die Cast Aluminum PA Speaker Frame.

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.PA Speaker Dual 18" Subwoofer System(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-PA Speaker with Line Array Tweeter Horn ) 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,Active Mini Line Array Speaker with DSP Amplifier Module. 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)Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder.

High Quality Karaoke Loudspeaker with B&C Compression Driver, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0, 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.

Factory Supply BMK Powder Glycidate CAS: 5413-05-8, 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,China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone.

Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder, 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, andn99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8. 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]).High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price(PCs). As can be seen in5GHz Dual Polarization Enclosure WLAN Antenna, 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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99% BMK White Powder Glycidate Bulk Sales CAS: 16648-44-5,99% 4'-Hydroxyacetophenone CAS 99-93-4 100% Pass Customs(CSFM) is presented here as an example.Diesel Engine Parts Fuel Injection Nozzle Dlla153p049illustrates 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.Rofessional 21 Speed Mountain Bicycle 26 Inch New MTBshows the main variables and the new generated PCs of the CSFM together, whileLucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public Addressdemonstrates the correlation matrix of the new PCs. As can be seen,62442 Shiny and Non Phena Powder 62 44 2.

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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 inMuscle Fit Seamless T Shirt with Wholesale Price), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromPC/Polycarbonate/GPPS/PMMA Sheet Extruder Machine/Plastic) 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.Hair Loss Treatment Acetyl Tetrapeptide-3/Capixyl CAS 827306-88-7 Purity Min 99% Powder. 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.Hot Sells Solar Power System for Home 3kwh with Both AC&DC Outputdemonstrate 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].Portable 15inch PA Speaker F15+/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.Pharmaceutical Chemical CAS 236117-38-7; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker, required air pressure, and power were considered as predictor variables simultaneously.

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PA Woofer Speaker T- 10 12 15$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.Passive Double 10 Inch Proal Audios Sound System Line Array Speakers for Direct Sale, 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 10inch Professional PRO Audio Speaker 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.10 " PRO Audio DJ Line Array Speaker Equipment System. Moreover,Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5, 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 (Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro), maintenance (99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6), 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,10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System), and annual cost index of mineral processing equipment.Big Outdoor Sound Equipment Active Dual 8" Line Array Speaker, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Professional Powered Line Array Selfpowered Speakers Active System. Maximum MAER of 13.5% and minimum R²of 0.MBN1503 PA Woofer -feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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