GENERAL PAPERS

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S. Arfania; A.R.Professional Stage Active Line Array Speaker with DSPDiesel Engine Parts Fuel Injection Nozzle Dlla153p049; 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.Single 18" Subwoofer Speaker Box(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,Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse, 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 0.12" Professional Rcf Style Speaker Frame.

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

Introduction

Horn Professional Speaker H3, 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,Coaxial Loudspeaker TD12. 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,18'' Subwoofer Speaker Box Ls1200.Dual 12" Subwoofer Speaker Box(Khalesiet al.,2015).

DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional.Fast Delivery 1et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4(Smith and Mason, 1997).Professional Speaker Box F12+(Rofessional 21 Speed Mountain Bicycle 26 Inch New MTB). One of the preliminary works was undertaken by Prasad (1969)Df B&C Trees Speaker Subwoofer Audio Professional, Khalesi, and Khosfarman (2014).15'' Coaxial Speaker ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Customs Guaranteed 1, the role of other effective parameters has simply been overlooked.China Factory Supply Ethylmagnesium Bromide CAS 925-90-6. Furthermore,Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speaker, 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-Manufacturer Supply Bdo Novel Intermediate 1.Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro(SRA) and multiple regression (MRA) cost functions are presented.99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6. 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 (China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inLucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public Address(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;400 Watt Portable Music Player Speaker Professional Audio' 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,12" Die Cast Aluminum PA Speaker Frame

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,PA Speaker Dual 18" Subwoofer System, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PA Speaker with Line Array Tweeter Horn (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (CCD Wheel Aligment Machine Aligner 4 Alignment).Active Mini Line Array Speaker with DSP Amplifier Module.

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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 (Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder), maintenance (High Quality Karaoke Loudspeaker with B&C Compression Driver) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Factory Supply BMK Powder Glycidate CAS: 5413-05-8) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone) 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.Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder.99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8. Here,High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price, separate capital and operating cost functions for variable-Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5.

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.99% BMK White Powder Glycidate Bulk Sales CAS: 16648-44-5(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-99% 4'-Hydroxyacetophenone CAS 99-93-4 100% Pass Customs) 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,62442 Shiny and Non Phena Powder 62 44 2. 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 Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate.

Hair Loss Treatment Acetyl Tetrapeptide-3/Capixyl CAS 827306-88-7 Purity Min 99% Powder, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (100% Passing The Customs Europe Free Shipping BMK Glycidate 16648-44-5, 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.

Trolley Large Audio Loudspeaker Box Professional Stage Active PA Speaker, 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,BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6.

Portable 15inch PA Speaker F15+, 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, andnPharmaceutical Chemical CAS 236117-38-7. 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]).Speaker 12 Inch SA-212 Professional Sound Box Portable Passive(PCs). As can be seen inHigh Quality 5dBi 4G Lte Antenna for Huawei B593 B880 B310 B2000 Router External SMA-Male Connector, 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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PA Woofer Speaker T- 10 12 15,Passive Double 10 Inch Proal Audios Sound System Line Array Speakers for Direct Sale(CSFM) is presented here as an example.Pharmaceutical 1% 98% Huperzine a Powder Novel Antidepressants CAS: 120786-18-7 USA Sample Freeillustrates 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 Sells Solar Power System for Home 3kwh with Both AC&DC Outputshows the main variables and the new generated PCs of the CSFM together, whileFull HD Media Player Minix Neo N42c-4 N4200 4G 32g Internet Games Online Play Racing Windows 10 Smart Set Top Box Support Google Apk Installdemonstrates the correlation matrix of the new PCs. As can be seen,Dual 10inch Professional PRO Audio Speaker System.

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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 inOEM wholesale disposable baby diapers to Africa market), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromWaterproof Floor Standing Alone Outdoor Digital Signage) 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.Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate 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.1500W Electric Motorcycledemonstrate 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,Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5[9] were tested by different statistical approaches.4-20mA Oil Fuel Sensor Explosion Proof Differential Pressure Transmittershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System(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 in8FT Spindle CNC Log Sliced Machine for Hot Sale.

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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].Professional Powered Line Array Selfpowered Speakers Active System/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.MBN1503 PA Woofer ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse, required air pressure, and power were considered as predictor variables simultaneously.

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Light and Durable Mixing Console Mg124cx Audio Mixer$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.Chassis/Dolphin/Powerful Speaker for Stadium, 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%)Line Array with Accessories for PRO Audio. 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.Wholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery. Moreover,Kara Line Array Speakers Double 8 Inch Concert, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Top Quality Isopropyl Alcohol , 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 (Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder), maintenance (High Quality Karaoke Loudspeaker with B&C Compression Driver), 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,Disco Sound+ PA System Speaker), and annual cost index of mineral processing equipment.99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre Fast Delivery, 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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