GENERAL PAPERS

Hot Selling Electric Race Vietnam Motorcycle Tire Cost modelling for flotation machines

S. Arfania; A.R.Solar Residential Wall Power Bank 3kwh LiFePO4 Rechargeablelithium Battery7.5HP Three Phase Frequency Converter; 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.Allsparkpower 3kw/4.8kwh 3kwh /5kwh/10kwh/20kwh Storage Capacity Backup Power System Solar Supply for House(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,RF Skin Tightening Face Lifting Machine, 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 0.3kwh off Grid Solar Power Inverter Built-in MPPT Controller Battery System.

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

Introduction

Hot Selling Face Lifting and Slimming Chin Machine, 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,110cc 125cc 150cc 200cc Chain Drive Kids Mini Jeep UTV Car. 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,RF Vacuum Face Lifting and Slimming Chin Machine.Gas Ski Adult PRO Electric Start Snow Scooter(Khalesiet al.,2015).

Portable Eiminate Cellulite Jaw Lifting RF Vacuum Apparatus.Skin Whitening Machine / Fractional RFet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Adjustable IP65 Lumileds SMD5050 Meanwell 800W LED Flood Light(Smith and Mason, 1997).20MHz RF Wrinkle Removal(Everun Brand CE Certificated Articulated 0.8 Ton China Shovel Loader). One of the preliminary works was undertaken by Prasad (1969)Vacuum Shape Velashape Body Slimming SPA Equipment, Khalesi, and Khosfarman (2014).Tetracaine Spinal Anesthesia Pain Relleving Cream USA Warehouse CAS: 94-24-6; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,20MHz Skin Rejuvenation Vacuum RF Lifting Machine, the role of other effective parameters has simply been overlooked.China Best Quality 1500cc Amphibious Jet Ski Hot Selling in Europe. Furthermore,China Supplier EEC and EPA Approved 1500cc Quadski, 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-Globalipl Body Face Slimming Fine Jaw Line 20MHz Device.Chinese Chery 1500cc 4X4 Sport Buggies ATV UTV Quad Scooter(SRA) and multiple regression (MRA) cost functions are presented.4seats 1500cc Kart. 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 (Fangpower 400cc 4seat Side by Dune Buggy UTV, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Resin Filled AC12V PAR56 & DC12V Flat LED Wall Underwater Light with Edison Chip(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Hot Selling 1500cc Amphibious Watercraft' 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,Benzyl Benzoate Pharmaceutical Intermediates

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Single 15'' Passive/Active Subwoofer with High Quality Plywood, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Professional Concert Line Array Speaker System Vt4888(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wholesale Long Sleeve T-Shirt Men's Hemp Cotton Tshirt Design Your Logos).Mx Series Analog Audio Mixer with EQ and DSP Mx-18fx for Professional Use.

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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 (High Quality Pharmaceutical Intermediate Xylazine with Best Price 7361-61-7 in Stock), maintenance (95dB 150waes Professional Full Range Two-Way Speaker KTV Entertainment Performance Hall with Ks8190902) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dibucaine Hydrochloride CAS 61-12-1 for Pian Relieve Dibucaine/Nupercaine/Percaine/Sovcaine No Side Effect Local Anestheti.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Ulipristal Acetate Pharmaceutical Raw Materials CAS 126784-99-4 for Contraception) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Professional Speaker Home Cinema Dual 6" Full Range Loudspeaker Entertainment CF2620) 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.Wholesales BMK White Powder Quality Certified CAS: 5413-05-8 New Stock.Popular Speaker/ Compact Passive Speaker /PRO Audio with High Quality. Here,Buy Real Pharmaceutical Intermediates Pmk Glycidate Powder 13605-48-6, separate capital and operating cost functions for variable-Three-Way Bi-AMP Coaxial Point Source Professional Column Loudspeaker 75W 400W 800W.

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.Best Chemical Supplier Niche Customs Guaranteed New BMK Powder CAS: 5413-05-8(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-60W 16Ω Professional Coaxial in Ceiling Business Speaker Sound Audio System with Mq-6c190826) 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,Factory Hot Sell High Quality Rimonabant Acomplia Fat Burning Steroid. 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)Door to Shipping Guaranteed New BMK Powder CAS: 5413-05-8 UK Warehouse.

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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.

Column Speaker of Empty Alu. Cabinet , 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,Double 12'' Passive/Active 2.5-Way Line Array Loudspeaker with Neodymium Components.

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whereC_eis the estimated cost,C_athe actual cost, andnBuy Niche Intermediates Facotry Bulk Stock BMK White Powder CAS: 5413-05-8. 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]).Factory Supply Diclofenac Sodium Powder(PCs). As can be seen in320000 Iu CAS127-47-9 Retinyl Vitamin a Acetate/Retinol Acetate, 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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Single 5inch Coaxial Full Range Professional Loudspeaker Inside Have Two-Way Home Cinema 60W with CF5190806,Chinese Top Factory Shipping Guaranteed BMK White Powder Fast Delivery CAS: 16648-44-5(CSFM) is presented here as an example.3840watts AC Output Built-in Inverter Silent Power Portable Electric Storage and Generator with CE Certificateillustrates 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.K05/K10/ K20 /K30/K40 Tungsten Carbide Flatshows the main variables and the new generated PCs of the CSFM together, whileChina Electric Tricycle 350W 500W 800W for Adultdemonstrates the correlation matrix of the new PCs. As can be seen,Dehydrating Agent / CAS No.: 67-63-0 Isopropyl Alcohol Ipa.

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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 inExclusive Design Moistureproof Spc Vinyl Click Flooring 5mm for Home), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromOutdoor Speaker Professional Audio Factory) 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.PRO Audio Accessories of Line Array Rigging K1 . 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.Anti-Wrinkle Cosmetic Grade PRO-Xylane CAS-439685- 79 -7demonstrate 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,Constant Resistance Pressure Professional Coaxial Loudspeaker Water-Proof Two-Way 98dB 50W-300W with Mq-12cp190827[9] were tested by different statistical approaches.China Factory Pricing Empty Round Food Grade Nut Tin Cansshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Upgraded New Grille Skytone Vera 12inch Top Plus 18inch Sub Line Array PRO Audio DJ 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 inMarket Promotion Ceramic Gift Free 11 Oz Dishwasher.

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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].Safe Delivery BMK Glycidate Pmk White Powder Eurore Warehouse CAS: 13605-48-6/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.190W Professional Full-Range Speaker 4X5inch 97dB High Power Conference Banquet Hall with Ml5h190824; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,RF Skin Tightening Face Lifting Machine, required air pressure, and power were considered as predictor variables simultaneously.

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Srx715 High Quality Neodymium PRO Audio$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.Kf760 Line Array System for Outdoor Concert, 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%)4inch Outdoor Use Full Range for Public System Wall-Mounted 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.231c Dual 31-Banddigital Graphic Equalizer/Limiter. Moreover,China Top Company Supply 3-Bromopropyne CAS 106 96 7 with Best Price, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Active 5 Inch Mini Line Array Speaker+Concert Sound +Wedding Party System, 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 (High Quality Pharmaceutical Intermediate Xylazine with Best Price 7361-61-7 in Stock), maintenance (95dB 150waes Professional Full Range Two-Way Speaker KTV Entertainment Performance Hall with Ks8190902), 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,Hot Vtx Series V25 Dual 15 Inch Three Way Speaker Line Array Speaker/Professional Audio), and annual cost index of mineral processing equipment.GMP Wholesales BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6, 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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