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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.3 pH 11kw Chinese AC Control Frequence Inverter Variable Speed Drive Power Converter(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,Water Proof Vet Ultrasound Scanner, 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.Three Phase Vector Frequence Converter with High Performance.

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

Introduction

Replica Aluminum Alloy Wheels for BMW 1/2/3/4/5/6/7 Series, 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,16"X6.0" 16'x7.0' 16X8.0 16X10 Trailer Steel Rim Wheel. 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,AC Drive Frequnce Converter Frequence Inverter Manufacturer Supplier.14"X5.0"J 14'x5.5'j 14X6.0j 14X7.0j Inch Steel Wheel for Sport Trailer(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (B5 200cc 250cc 300cc Cargo Tricycle with Cabin Motorcycle Three Wheel Loncin Zongshen Lifan Engine, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMobile Induction Heater for Welding Brazing Melting(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Growatt 50000W 60000W 70000W 80000W Grid Tied Solar Inverter' 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,300cc Road Legal Ault Street Gas Three Wheel Scooter

►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 Supplier Ophthalmic Equipment Ultrasound Ab Scan, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Vimode Electric Scooter Adult Motorcycle for Adults 800W(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (High Quality Cacl2 Calcium Chloride Anhydrous for Snow Melting Agent).150cc/200cc/250cc / 300cc Three Wheel Cargo Motorcycle /Tricycle.

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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 (Heavy Duty Tricycle 250cc), maintenance (Electric Motorcycle Fashion Design 800W with Removable Battery) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,City Scooter 800W Long Range Electric.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (800W Electric Scooter Motorcycle Bicycle with Folding Rack) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Wholesale Adult Tricycle Price Adults Tuk Motorcycle in India) 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.Sporty 500W/ 800W /1000W.5GHz 10dBi Outdoor WiFi Omni Antenna . Here,Ho-500 Ce Approved High Quality Eye Diagnosis System Ophthalmic Ultrasound Scanner, separate capital and operating cost functions for variable-Market Hot Two Wheel 800W 72V 32ah Electric Scooter/Motorcycle From China.

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.Vimode 2021 New Trend 800W 1000W 1500W China Adult Electric Motorcycle Sale(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-Police Motorcycle 250cc) 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,125cc Scooter EEC Popular Motor Alex. 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)250cc Three Wheel Cargo Motor Tricycle .

Motorbicycle with Stable Wheels, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (2021 60km/H Electric/Pull Starting System 4 Stroke 150cc Adult Gasolina Gokart Kart Racing Go for Sale Cheap, 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.

Scooter with Stable Function and Nice Outside Looking, 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,Motorcyle for Both Oil and Water Cooling.

150cc China Gas Motor Cargo Trike for Sale , 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, andnSw-1000p Ophthalmic Pachymeter. 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]).Moped Motorbike Scooter Dirt Street Bike Gas 50cc 125cc Petrol Motor Gasoline Cub EEC & Coc 2 Wheel Racing Motorcycle F66 (PCs). As can be seen inHot Sale 800ml Size 1liter Engine Oil Tinplate Tin Can with Metal Pressure Lid, 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.Gabon Okoume Veneer a B C D Grade From Factory to Indiashows the main variables and the new generated PCs of the CSFM together, whilePolyamide Resin with Benzene Soluble for Printing Inksdemonstrates the correlation matrix of the new PCs. As can be seen,5GHz 30dBi Mimo Dish Antennas.

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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 inBeautiful Colors Simple Crystal Head Muslim Hijab Pins as Brooch Pin), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromCarb E0 Glue Cabinets Grade 18mm White Birch Plywood From China) 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.Internal 2.4GHz/ 5GHz Antenna/TV Antenna/Stainless Steel with Rg1.13 Dual-Band Antenna. 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.Pharma Intermediate Dibenzylideneacetone CAS 35225- 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,24 Channels Fixed Modulator[9] were tested by different statistical approaches.Best Price O-Phthalaldehydeshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.5150-5850MHz Sector Panel Antenna 2*17dBi(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 inAgrochemicals Weedicide Clodinafop-Propargyl 95% Tc with factory price.

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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].Replica Aluminum Alloy Wheels for Skoda/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.Best Price Sab-500 Ophtalmic Ab Scan; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Water Proof Vet Ultrasound Scanner, required air pressure, and power were considered as predictor variables simultaneously.

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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.Ophthalmic Equipment Biometer Scan a. Moreover,0-20dB 75 Ohm CATV Variable Adjustable Attenuator Equalizer, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (860MHz CATV One Way Amplifiers, 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 (Heavy Duty Tricycle 250cc), maintenance (Electric Motorcycle Fashion Design 800W with Removable Battery), 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,CATV Mini Line Extending 2-Way Amplifer), and annual cost index of mineral processing equipment.20MHz Probe Ophthalmology Ultrasound MD-2300S, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,860MHz Two Way Amplifier . Maximum MAER of 13.5% and minimum R²of 0.Safe 24V 48V 50ah 100ah Electric Motorcycle Lithium Battery Pack with Deep Cycle-feasibility and even feasibility study level of projects.

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Mular, A.L. 1982.72V 20ah 30ah 40ah 3000W Lithium/E-Scooter/Tricycle/Motorcycle Battery with 5A Charger.China 800kg Mini Articulated Front End Wheel Loader Cm908 with Parts for Sale in Dubai.Everun Er08 CE Wheel Loader with Standard Bucket for Sale, Montreal. 265 pp.         [94% Sodium Tripolyphosphate STPP CAS No: 7758- 79 -4]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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