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.Chassis/Dolphin/Powerful Speaker for Stadium(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,Line Array with Accessories for PRO 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.Wholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery.

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

Introduction

Kara Line Array Speakers Double 8 Inch Concert, 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,Top Quality Isopropyl Alcohol . 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,Disco Sound+ PA System Speaker.99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre Fast Delivery(Khalesiet al.,2015).

High Quality Chloramphenicol CAS 56-75-7 China Factory Supplier.High Quality 99% CAS 16595-80-5 Levamisole Hydrochlorideet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Adhesion Polyurethane PU Resin for Printing Ink(Smith and Mason, 1997).N- (Double End Single Side Acrylic Freestanding Tub). One of the preliminary works was undertaken by Prasad (1969)Kara Double 8 Inch Liner Speaker System Professional Audio Equipment, Khalesi, and Khosfarman (2014).Raw Material Anti Epilepsy Topiramate Powder with Best Price; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Dual 12 Inch Powered Line Array Active Sound System W-210bp, the role of other effective parameters has simply been overlooked.High Quality CAS 16595-80-5 Levamisole Hydrochloride/ HCl. Furthermore,Levamisole Hydrochloride/ HCl Powder CAS 16595-80-5, 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-Pain Relleving Patch Topical Lidocaine Spray137-58-6 UK Warehouse Free Sample.Kas DJ Speaker Dual Line Array 18 Inch Subwoofer(SRA) and multiple regression (MRA) cost functions are presented.Mini Speaker Line Array Wedding Decoraions DJ Mixer. 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 (8 Ohm PRO Audio DJ Mixer Live Sound System, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inProfessional Line Array Speaker Neodymium Af15(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Professional Stage Line Array System Dual 15'' Self-Powered Speaker' 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,Levamisole HCl / Hydrochloride Anthelmintic Agent Raw CAS 16595-80-5

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Price, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Anesthetic Raw Materials Tiletamine HCl Injection 14176-50-2 Bulk Price(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (1000W 1500 Watts Metal Tube Pipe Fiber Laser Cutting Machine for Kitchen Equipment).High Quality Nootropics Noopept CAS 157115-85-0 Best Price.

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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 Manufacturer Supply High Purity Food Grade Lactic Acid CAS 50-21-5), maintenance (2021 Hot-Sale Lt12 Dual 12" Concert Line Array System) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Line Array of Parts for PRO Audio Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Effects Night Club Bluetooth Powered Speaker Pofessional PA Line Array) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (High Reliability DSP Active Professional Line Array 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.Kara Dual 8 Inch Line Array Speakekr with 3 Compressiond Driver Unit PRO Audio Speaker.Professional Audio Line Array Speaker Neodymium Crossover System. Here,Line Array System with Parts for PRO Audio Speaker , separate capital and operating cost functions for variable-Dual 12 Inch Top Passive Line Array Speaker and Single 18 Sub 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.Power Amplifier Module Board + Made in China 400 Watt AMP(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-Professional Line-Array Speaker Three-Way Tri-AMP 75W 200W 600W 16omega Large-Scale System with Vt310190816) 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,Tp01 Piezo Electric Dome Tweeter. 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)Line Array of Parts for PRO Audio Speaker .

Line Array with Accessories for PRO Audio , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Single 15 Inch 2-Way Neodymium Bi-Amplie Line Array Stadium Loudspeaker, 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.

Bulk Supply Veterinary Tranquilizer Tiletamine Xylazine Powder 14176-50-2, 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,Tg01 1 Inch Silk Dome Tweeter.

Professional Speaker Compective PRO Audio , 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, andnDouble 12inch Active Coaxial 29kg Line Array Speaker System. 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]).Free Shipping 99% Tranquilizer Powder Tiletamine HCl 14176-50-2 NMDA Receptor(PCs). As can be seen in350ml Brake Fluid Glue Tin Bottle, 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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Levamisole HCl Anthelmintic Agent Hydrochloride Raw CAS 16595-80-5,Safe Delivery Anesthesia Injection Tiletamine Xylazine Pure Powder 14176-50-2(CSFM) is presented here as an example.D&B Q1 Style Dual 10 Inch Professional Speaker 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.3ru 24 in 1 CATV Fixed Channel Modulator shows the main variables and the new generated PCs of the CSFM together, whileHome Application on Grid Tied Solar Power System 3kwdemonstrates the correlation matrix of the new PCs. As can be seen,High Quality Chemical Pharmaceutical Intermediate Xylazine Hydrochloride CAS 23076-35-9.

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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 in2021 Wholesale Balboa System Acrylic Outdoor Whirlpool SPA Hot Tub), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from45cm Offset Satellite TV Antenna with 200 Hour UV Test) 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.Professional Loudspeaker Line Array PRO Audio. 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.High Purity and Good Price Glycolic Acid demonstrate 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,Live Music Sound Line Array System for Acoustic and Electronic Performance[9] were tested by different statistical approaches.Yn725g Yineng Mini Wheel Loader 18.5kw No Cabinshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.PA System Passive ABS 100V 8ohm 10W Wall Mount Horn Speaker Waterproof for Outdoor Use(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 inIndoor Rental High Resolution Wedding Advertising Stage LED Display Screen.

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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].Mercado Brasil 99.85% Lidocaina HCl Sem Problemas Aduaneiros/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.100% Passing Customs Local Anesthetic Drugs Procaine for Pain Release; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Line Array with Accessories for PRO Audio, required air pressure, and power were considered as predictor variables simultaneously.

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Supply 99% Purity Anesthetic Procaine Base HCl CAS: 51-05-8$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.Gamma-Aminobutyric Acid GABA CAS: 56-12-2 with Best Price, 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%)Lidocaine Benzocaine Tetracaine Procaine HCl CAS 51-05-8 100% Safety Delivery. 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.Hot Sale Professional Loudspeaker PRO Audio . Moreover,Free Sample Bulk Stock Procaine South America Warehouse CAS: 51-05-8, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Quality with Good Price Oxytetracycline HCl Powder, 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 Manufacturer Supply High Purity Food Grade Lactic Acid CAS 50-21-5), maintenance (2021 Hot-Sale Lt12 Dual 12" Concert Line Array System), 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,Chinese Factory for Vitamin a Palmitate 0.25miu Powder), and annual cost index of mineral processing equipment.Chinese Top Local Anesthetic Exporter Bulk Sales Procaine CAS: 51-05-8, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Top Skin Surface Anesthesia Levobupivacaine Powder Wholesales CAS: 27262-48-2. Maximum MAER of 13.5% and minimum R²of 0.High Quality and Purity Raw Material Supplier Xylazine HCl CAS 23076-35-9 with Best Price-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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