GENERAL PAPERS

Ophthalmic Pachymeter Cost modelling for flotation machines

S. Arfania; A.R.Dual 6inch Loudspeaker for Coffee Room Restaurant Conference SpeakersSwimming SPA Pool Hot Tub Combo; 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.Dm 15 Inch PA Full Sound Systems Professional PRO 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,12inch KTV Bar PA Full Sound Speaker System 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.Dare Dual 8" Neodymium Active Line Array Set PA System.

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

Introduction

12" Die Cast Aluminum PA Speaker Frame, 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 Dual 18" Subwoofer System. 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,PA Speaker with Line Array Tweeter Horn .Active Mini Line Array Speaker with DSP Amplifier Module(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (62442 Shiny and Non Phena Powder 62 44 2, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inModern Home Hotel Lesuire Corner Single Fabric Living Room Sofa(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Quality Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate' 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,Portable 15inch PA Speaker F15+

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Pharmaceutical Chemical CAS 236117-38-7, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Speaker 12 Inch SA-212 Professional Sound Box Portable Passive(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Free Standing 2 Person Jetted Bathtub).Speaker Tcx- 10.

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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 (PA Woofer Speaker T- 10 12 15), maintenance (Passive Double 10 Inch Proal Audios Sound System Line Array Speakers for Direct Sale) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dual 10inch Professional PRO Audio Speaker System.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (10 " PRO Audio DJ Line Array Speaker Equipment System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder) 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.Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5.10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System. Here,Big Outdoor Sound Equipment Active Dual 8" Line Array Speaker, separate capital and operating cost functions for variable-Professional Powered Line Array Selfpowered Speakers Active System.

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.MBN1503 PA Woofer (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-Best Quality BMK Glycidate Raw Materials Fororganic Intermediates Bulk Price) 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,Self Powered Generator Double 8 Inch Outdoor Sound Indoor Line Array. 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)Light and Durable Mixing Console Mg124cx Audio Mixer.

Chassis/Dolphin/Powerful Speaker for Stadium, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Line Array with Accessories for PRO Audio, 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.

Wholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery, 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,Kara Line Array Speakers Double 8 Inch Concert.

Top Quality Isopropyl Alcohol , 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, andnDisco Sound+ PA System Speaker. 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]).99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre Fast Delivery(PCs). As can be seen inSuper Design Mini Earpieces Headset Wireless Earphones for Huawei, 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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High Quality 99% CAS 16595-80-5 Levamisole Hydrochloride,N- (CSFM) is presented here as an example.150cc Automatic Racing Sports Exclusive Design ATV illustrates 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.Gy6 150cc Gas Scootershows the main variables and the new generated PCs of the CSFM together, while65''75'' Factory Whole Sale IP65 Windows Waterproof Double Sided Outdoor Totem LCD Kioskdemonstrates the correlation matrix of the new PCs. As can be seen,Kara Double 8 Inch Liner Speaker System Professional Audio 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 in280mm Night with Thin Soft Blue Core Instant Suction Sanitary Napkin), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from55 Inch Outdoor Double-Side LCD Display Self Service Airport Kiosk Touch Screen Multimedia Information) 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.Dual 12 Inch Powered Line Array Active Sound System W-210bp. 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.Pharmaceutical High Purity Peptides Powder CAS No. 113- 79 -1 Argipressin Acetatedemonstrate 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,High Quality CAS 16595-80-5 Levamisole Hydrochloride/ HCl[9] were tested by different statistical approaches.off Grid 20kw Solar System 20 Kw Panel Kitshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Levamisole Hydrochloride/ HCl Powder CAS 16595-80-5(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 inLow Voltage Safety LED Neon Sign.

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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].Kas DJ Speaker Dual Line Array 18 Inch 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.Mini Speaker Line Array Wedding Decoraions DJ Mixer; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,12inch KTV Bar PA Full Sound Speaker System Audio, required air pressure, and power were considered as predictor variables simultaneously.

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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.Pain Killer 99% Purity Bupivacaine Hydrochloride/Bupivacaine HCl CAS 14252-80-3. Moreover,Levamisole HCl / Hydrochloride Anthelmintic Agent Raw CAS 16595-80-5, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Price, 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 (PA Woofer Speaker T- 10 12 15), maintenance (Passive Double 10 Inch Proal Audios Sound System Line Array Speakers for Direct Sale), 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,Anesthetic Raw Materials Tiletamine HCl Injection 14176-50-2 Bulk Price), and annual cost index of mineral processing equipment.High Quality Nootropics Noopept CAS 157115-85-0 Best Price, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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