GENERAL PAPERS

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S. Arfania; A.R.Professional Body Contouring Cellulite Removal RF Vacuum Roller Velashape 3 Slimming MachineSolvent Violet 10b 9; 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.20W 30W Handheld Vin Number Metal Logo Laser Marking Machine(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,Velashape Slimming Cellulite Removal Body Sculpting Fat 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.Popular 3kwh Hot Saling Li-ion Battery Supplier.

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

Introduction

CE Approved Vacuum Cavitation Roller RF Velashape 3 Slimming 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,EEC EPA Extreme Adult RC 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,Skin Renew Thermal RF & Fractional 2 in 1 Machine.Home Use RF Velashape Machine(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (110cc 125cc 150cc 200cc Chain Drive Kids Mini Jeep UTV Car, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPolyamide Resin(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;RF Vacuum Face Lifting and Slimming Chin Machine' 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,Vacuum Shape Velashape Body Slimming SPA Equipment

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Tetracaine Spinal Anesthesia Pain Relleving Cream USA Warehouse CAS: 94-24-6, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),20MHz Skin Rejuvenation Vacuum RF Lifting Machine(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Red Black Grille Badge Plastic Trunk Front Decal Emblem).China Best Quality 1500cc Amphibious Jet Ski Hot Selling in Europe.

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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 Supplier EEC and EPA Approved 1500cc Quadski), maintenance (Globalipl Body Face Slimming Fine Jaw Line 20MHz Device) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Chinese Chery 1500cc 4X4 Sport Buggies ATV UTV Quad Scooter.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (4seats 1500cc Kart) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Fangpower 400cc 4seat Side by Dune Buggy UTV) 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.China Hot Selling 1500cc Amphibious Watercraft.Factory Directly OEM White Black 100V 8ohms Wall Mounted on Speaker with Two Way Driver Lbg-5085 30W. Here,Diase Professional Speaker Vt-4887 Three Way Dual 8inch Line Array, separate capital and operating cost functions for variable-Stage Monitor Professional Speaker Multi-Function Hall Fill Loudspeaker All Occasions 450W with M1220.

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.Single 15'' Sub Bass to U Series Full Range Speaker(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-Benzyl Benzoate Pharmaceutical Intermediates) 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,Single 15'' Passive/Active Subwoofer with High Quality Plywood. 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)Professional Concert Line Array Speaker System Vt4888.

Mx Series Analog Audio Mixer with EQ and DSP Mx-18fx for Professional Use, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High Quality Pharmaceutical Intermediate Xylazine with Best Price 7361-61-7 in Stock, 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.

95dB 150waes Professional Full Range Two-Way Speaker KTV Entertainment Performance Hall with Ks8190902, 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,Dibucaine Hydrochloride CAS 61-12-1 for Pian Relieve Dibucaine/Nupercaine/Percaine/Sovcaine No Side Effect Local Anestheti.

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whereC_eis the estimated cost,C_athe actual cost, andnProfessional Speaker Home Cinema Dual 6" Full Range Loudspeaker Entertainment CF2620. 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]).Wholesales BMK White Powder Quality Certified CAS: 5413-05-8 New Stock(PCs). As can be seen inLight Source Be Glued IP68 LED Underwater for Swimming Pool with Two Years Warranty, 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.7.5HP Three Phase Frequency Convertershows the main variables and the new generated PCs of the CSFM together, whileEverun Brand CE Certificated Articulated 0.8 Ton China Shovel Loaderdemonstrates the correlation matrix of the new PCs. As can be seen,Best Chemical Supplier Niche Customs Guaranteed New BMK Powder CAS: 5413-05-8.

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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 inIndoor Rental High Resolution Wedding Advertising Stage LED Display Screen), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from320000 Iu CAS127-47-9 Retinyl Vitamin a Acetate/Retinol Acetate) 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 Hot Sell High Quality Rimonabant Acomplia Fat Burning Steroid. 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.3840watts AC Output Built-in Inverter Silent Power Portable Electric Storage and Generator with CE Certificatedemonstrate 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,Door to Shipping Guaranteed New BMK Powder CAS: 5413-05-8 UK Warehouse[9] were tested by different statistical approaches.K05/K10/ K20 /K30/K40 Tungsten Carbide Flatshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.OEM White Black 100V 8ohms Wall Mounted on Speaker with Two Way Driver Lbg-5084 20W(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 inYingjiao Wholesale Custom 100 240V Power Supply 12V 1.5A 15V 1.2A 24V 800mA DC Adapter.

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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].Column Speaker of Empty Alu. Cabinet /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.Double 12'' Passive/Active 2.5-Way Line Array Loudspeaker with Neodymium Components; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Velashape Slimming Cellulite Removal Body Sculpting Fat Machine, required air pressure, and power were considered as predictor variables simultaneously.

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Factory Supply Diclofenac Sodium Powder$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.Factory Supply Intermediates Bulk Stock BMK White Powder Glycidate 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%)Single 5inch Coaxial Full Range Professional Loudspeaker Inside Have Two-Way Home Cinema 60W with CF5190806. 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.Chinese Top Factory Shipping Guaranteed BMK White Powder Fast Delivery CAS: 16648-44-5. Moreover,Dehydrating Agent / CAS No.: 67-63-0 Isopropyl Alcohol Ipa, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (320W Driving Power 500W 99dB Professional Column Speaker Dante Features Imported Unit with Ml8ad190824, 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 Supplier EEC and EPA Approved 1500cc Quadski), maintenance (Globalipl Body Face Slimming Fine Jaw Line 20MHz Device), 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,PRO Audio Accessories of Line Array Rigging K1 ), and annual cost index of mineral processing equipment.Constant Resistance Pressure Professional Coaxial Loudspeaker Water-Proof Two-Way 98dB 50W-300W with Mq-12cp190827, and over- extrapolation could result in misguiding estimates.

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References

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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