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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.Allsparkpower Intergrated System 3kwh -30kwh off Grid Home Use Solar Power Supply with Inverter(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,Snow Mobile Rubber Track Gas Adult Ski Scooter, 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.Factory Price Home Solar Energy System 3kwh with 5 Years Warranty.

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

Introduction

New Design Stretch Mark Removal Beauty Machines, 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,Powerful Snow Ski LED Lights Adult Racing a Snowmobile. 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,Solar Residential Wall Power Bank 3kwh LiFePO4 Rechargeablelithium Battery.Allsparkpower 3kw/4.8kwh 3kwh /5kwh/10kwh/20kwh Storage Capacity Backup Power System Solar Supply for House(Khalesiet al.,2015).

RF Skin Tightening Face Lifting Machine.3kwh off Grid Solar Power Inverter Built-in MPPT Controller Battery Systemet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Biocar Multifunctional 2-Phenylbenzimidazole CAS 716- 79 -0 C13h10n2 with CE Certificate(Smith and Mason, 1997).Hot Selling Face Lifting and Slimming Chin Machine(with Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh Enjoys 2 Years Warranty). One of the preliminary works was undertaken by Prasad (1969)110cc 125cc 150cc 200cc Chain Drive Kids Mini Jeep UTV Car, Khalesi, and Khosfarman (2014).RF Vacuum Face Lifting and Slimming Chin Machine; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Gas Ski Adult PRO Electric Start Snow Scooter, the role of other effective parameters has simply been overlooked.Portable Eiminate Cellulite Jaw Lifting RF Vacuum Apparatus. Furthermore,Skin Whitening Machine / Fractional RF, 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-20MHz RF Wrinkle Removal.Vacuum Shape Velashape Body Slimming SPA Equipment(SRA) and multiple regression (MRA) cost functions are presented.Tetracaine Spinal Anesthesia Pain Relleving Cream USA Warehouse 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 (20MHz Skin Rejuvenation Vacuum RF Lifting Machine, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHot Selling Electric Race Vietnam Motorcycle Tire (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Best Quality 1500cc Amphibious Jet Ski Hot Selling in Europe' 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,Fangpower 400cc 4seat Side by Dune Buggy UTV

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,China Hot Selling 1500cc Amphibious Watercraft, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Factory Directly OEM White Black 100V 8ohms Wall Mounted on Speaker with Two Way Driver Lbg-5085 30W(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Resin Crafts).Diase Professional Speaker Vt-4887 Three Way Dual 8inch Line Array.

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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 (Stage Monitor Professional Speaker Multi-Function Hall Fill Loudspeaker All Occasions 450W with M1220), maintenance (Single 15'' Sub Bass to U Series Full Range Speaker) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Benzyl Benzoate Pharmaceutical Intermediates.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Single 15'' Passive/Active Subwoofer with High Quality Plywood) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Professional Concert Line Array Speaker System Vt4888) 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.Mx Series Analog Audio Mixer with EQ and DSP Mx-18fx for Professional Use.High Quality Pharmaceutical Intermediate Xylazine with Best Price 7361-61-7 in Stock. Here,95dB 150waes Professional Full Range Two-Way Speaker KTV Entertainment Performance Hall with Ks8190902, separate capital and operating cost functions for variable-Dibucaine Hydrochloride CAS 61-12-1 for Pian Relieve Dibucaine/Nupercaine/Percaine/Sovcaine No Side Effect Local Anestheti.

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.Ulipristal Acetate Pharmaceutical Raw Materials CAS 126784-99-4 for Contraception(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 Speaker Home Cinema Dual 6" Full Range Loudspeaker Entertainment CF2620) 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,Wholesales BMK White Powder Quality Certified CAS: 5413-05-8 New Stock. 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)Popular Speaker/ Compact Passive Speaker /PRO Audio with High Quality.

Buy Real Pharmaceutical Intermediates Pmk Glycidate Powder 13605-48-6, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Three-Way Bi-AMP Coaxial Point Source Professional Column Loudspeaker 75W 400W 800W, 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.

Best Chemical Supplier Niche Customs Guaranteed New BMK Powder 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,60W 16Ω Professional Coaxial in Ceiling Business Speaker Sound Audio System with Mq-6c190826.

Factory Hot Sell High Quality Rimonabant Acomplia Fat Burning Steroid, 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, andnDoor to Shipping Guaranteed New BMK Powder CAS: 5413-05-8 UK Warehouse. 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]).OEM White Black 100V 8ohms Wall Mounted on Speaker with Two Way Driver Lbg-5084 20W(PCs). As can be seen inEverun Brand CE Certificated Articulated 0.8 Ton China Shovel Loader, 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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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.320000 Iu CAS127-47-9 Retinyl Vitamin a Acetate/Retinol Acetateshows the main variables and the new generated PCs of the CSFM together, whileMotorcycle Scooter Front Clutch Assembly Compatible with Gy6 -50 Enginesdemonstrates the correlation matrix of the new PCs. As can be seen,High Quality 99% Ethylamine Hydrochloride CAS No 557-66-4 ISO 9001 Certificate.

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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 inWholesale Customizable Wirelss Handheld Quick UV LED Curling Light Nail Polish Dryer), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromChina Electric Tricycle 350W 500W 800W for Adult) 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.Factory Supply Diclofenac Sodium 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.Clinical Equipment Portable Ultrasound Bone Densitometer for Hospitaldemonstrate 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,Factory Supply Intermediates Bulk Stock BMK White Powder Glycidate CAS: 16648-44-5[9] were tested by different statistical approaches.Outdoor Speaker Professional Audio Factoryshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Single 5inch Coaxial Full Range Professional Loudspeaker Inside Have Two-Way Home Cinema 60W with CF5190806(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 inSoya Tacos Food Processing Line.

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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].Dehydrating Agent / CAS No.: 67-63-0 Isopropyl Alcohol Ipa/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.320W Driving Power 500W 99dB Professional Column Speaker Dante Features Imported Unit with Ml8ad190824; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Snow Mobile Rubber Track Gas Adult Ski Scooter, required air pressure, and power were considered as predictor variables simultaneously.

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Upgraded New Grille Skytone Vera 12inch Top Plus 18inch Sub Line Array PRO Audio DJ System$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.High Purity New BMK Powder with Low Price in Stock CAS: 16648-44-5, 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%)Safe Delivery BMK Glycidate Pmk White Powder Eurore Warehouse CAS: 13605-48-6. 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.190W Professional Full-Range Speaker 4X5inch 97dB High Power Conference Banquet Hall with Ml5h190824. Moreover,Professional All Weather Water-Proof Indoor Outdoor 4inch Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Birch Plywood 2-Way Crossover Passive Loudspeaker , 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 (Stage Monitor Professional Speaker Multi-Function Hall Fill Loudspeaker All Occasions 450W with M1220), maintenance (Single 15'' Sub Bass to U Series Full Range Speaker), 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,Srx715 High Quality Neodymium PRO Audio), and annual cost index of mineral processing equipment.Kf760 Line Array System for Outdoor Concert, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,4inch Outdoor Use Full Range for Public System Wall-Mounted Speaker. Maximum MAER of 13.5% and minimum R²of 0.231c Dual 31-Banddigital Graphic Equalizer/Limiter-feasibility and even feasibility study level of projects.

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Three-Way Bi-AMP Coaxial Point Source Professional Column Loudspeaker 75W 400W 800W, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmk.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Adult 150cc 200cc 300cc EPA Approved Three Wheel Mptorcycle Scooter]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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