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Rofessional 21 Speed Mountain Bicycle 26 Inch New MTBCost modelling for flotation machines

S. Arfania; A.R.Horn Professional Speaker H3Lucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public Address; 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.Coaxial Loudspeaker TD12(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,18'' Subwoofer Speaker Box Ls1200, 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.Dual 12" Subwoofer Speaker Box.

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

Introduction

DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional, 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,Fast Delivery 1. 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,Professional Speaker Box F12+.Df B&C Trees Speaker Subwoofer Audio Professional(Khalesiet al.,2015).

15'' Coaxial Speaker .Customs Guaranteed 1et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Peptide Cosmetics CAS 155149- 79 -4 Capixyl(Smith and Mason, 1997).China Factory Supply Ethylmagnesium Bromide CAS 925-90-6(St 5kw Single Phase AC Electric Alternator Generator). One of the preliminary works was undertaken by Prasad (1969)Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speaker, Khalesi, and Khosfarman (2014).Manufacturer Supply Bdo Novel Intermediate 1; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro, the role of other effective parameters has simply been overlooked.99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6. Furthermore,China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole, 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-400 Watt Portable Music Player Speaker Professional Audio.Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers(SRA) and multiple regression (MRA) cost functions are presented.Dm 15 Inch PA Full Sound Systems Professional PRO Speaker. 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 (12inch KTV Bar PA Full Sound Speaker System Audio, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality 5dBi 4G Lte Antenna for Huawei B593 B880 B310 B2000 Router External SMA-Male Connector(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Dare Dual 8" Neodymium Active Line Array Set PA System' 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,Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,High Quality Karaoke Loudspeaker with B&C Compression Driver, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Unique Aroma Luxurious Long Lasting Oriental Arabic Perfume Oils Concentrated Fragrance Pure).Factory Supply BMK Powder Glycidate CAS: 5413-05-8.

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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 Factory Supply CAS 99-93-4 4-Hydroxyacetophenone), maintenance (Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5) 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.99% BMK White Powder Glycidate Bulk Sales CAS: 16648-44-5.99% 4'-Hydroxyacetophenone CAS 99-93-4 100% Pass Customs. Here,62442 Shiny and Non Phena Powder 62 44 2, separate capital and operating cost functions for variable-Quality Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate.

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.Hair Loss Treatment Acetyl Tetrapeptide-3/Capixyl CAS 827306-88-7 Purity Min 99% Powder(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-100% Passing The Customs Europe Free Shipping BMK Glycidate 16648-44-5) 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,Trolley Large Audio Loudspeaker Box Professional Stage Active PA Speaker. 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)BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6.

Portable 15inch PA Speaker F15+, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Pharmaceutical Chemical CAS 236117-38-7, 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.

Speaker 12 Inch SA-212 Professional Sound Box Portable Passive, 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,Speaker Tcx- 10.

PA Woofer Speaker T- 10 12 15, 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, andnPassive Double 10 Inch Proal Audios Sound System Line Array Speakers for Direct Sale. 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]).Dual 10inch Professional PRO Audio Speaker System(PCs). As can be seen inPharmaceutical 1% 98% Huperzine a Powder Novel Antidepressants CAS: 120786-18-7 USA Sample Free, 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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Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder,Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5(CSFM) is presented here as an example.Full HD Media Player Minix Neo N42c-4 N4200 4G 32g Internet Games Online Play Racing Windows 10 Smart Set Top Box Support Google Apk Installillustrates 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.New Arrival 4K Smart S905X2 TV Box 4+64GB X96 Minishows the main variables and the new generated PCs of the CSFM together, while1220X2440X9mm Carb P2 Glue Bleached Poplar Plywood for Furnituredemonstrates the correlation matrix of the new PCs. As can be seen,10 " PRO Sound PA Line Array Loudspeaker 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 inin Stock China Facemask 3 Ply Earloop Doctor Disposable Medical Face Mask), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from1500W Electric Motorcycle) 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 Powered Line Array Selfpowered Speakers Active System. 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.Sanland 860MHz 34dB Gain CATV Push-Pull Amplifier Module 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,MBN1503 PA Woofer [9] were tested by different statistical approaches.High Security Door Peephole Eyes Viewer DV3828b shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Best Quality BMK Glycidate Raw Materials Fororganic Intermediates Bulk Price(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 inStainless Steel Fiber Laser Cutting Machine for 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].Light and Durable Mixing Console Mg124cx Audio Mixer/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.Chassis/Dolphin/Powerful Speaker for Stadium; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,18'' Subwoofer Speaker Box Ls1200, required air pressure, and power were considered as predictor variables simultaneously.

Line Array with Accessories for PRO Audio. Moreover, the operating cost was detailed in different cost items.Wholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery, indicated inZl08 800kg China Articulated Mini Small Compact Front End Wheel Loaders with Ce, and major extrapolation should be avoided.

Kara Line Array Speakers Double 8 Inch Concert$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.Top Quality Isopropyl Alcohol , 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%)Disco Sound+ PA System Speaker. 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.99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre Fast Delivery. Moreover,High Quality Chloramphenicol CAS 56-75-7 China Factory Supplier, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Quality 99% CAS 16595-80-5 Levamisole Hydrochloride, 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 Factory Supply CAS 99-93-4 4-Hydroxyacetophenone), maintenance (Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder), 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,N- ), and annual cost index of mineral processing equipment.Kara Double 8 Inch Liner Speaker System Professional Audio Equipment, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Raw Material Anti Epilepsy Topiramate Powder with Best Price. Maximum MAER of 13.5% and minimum R²of 0.Dual 12 Inch Powered Line Array Active Sound System W-210bp-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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