GENERAL PAPERS

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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.China Electric Mobility Scooter Motorcycle with Lights/Electric Bicycle Moped Fast Delivery(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,Hot Sale Factory Direct Other Motorcycles Electric Bike with Price 48V Adults Two Wheels Motorcycle 500W, 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.World IPTV M3u Subscription 1 Year for Arabic Netherlands Malta Austria Bulgaria Romania Egypt Croatia Africa 9600 Channels Smart TV Android Apple.

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

Introduction

Factory Price Wholesale Vespa Electric Scooter Motorcycle Adult, 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,Cheaper Long Range off Road Best Selling Hot China Xindazhou Products Motorcycle Electric Adult. 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,2021 Fashion Electric Mtorcycle 2000W Motor China.Mini Dumper Wolf Wl80 Loader with CE(Khalesiet al.,2015).

Engine Oil Cans 4 Liter Motor Lubricating Tin Can.Yn725 Gyineng Mini Wheel Loaderet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for New Products Lift Recliner Chair Sofa (Smith and Mason, 1997).Solar Pump Frequency Inverter MPPT Fuction 0.75kw(Heat Seal Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Plastic Exit Storage Weed Hemp Cigar Container). One of the preliminary works was undertaken by Prasad (1969)Modern Design Rk3318 Android 4GB RAM 32GB ROM HK1 Cool Free Internet Octa Core 9.0 Set Top TV Box, Khalesi, and Khosfarman (2014).Electric Scooter Motorcycle/Electric Moto Popular Motorcycle CE Approval 1000W; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,AC to Drive 380V Frequency Inverter 4kw, the role of other effective parameters has simply been overlooked.Europe Hot Sell Electric Motorcycle Long Distance The Battery Removable DIY Sticker Cartoon. Furthermore,2021 New Cheap Hot Sale Adults Small Electric 800W Motorcycle with Pedals, 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-China Hot Sale Single Phase Variable Frequency Inverter 1.5kw 220V.Small Fquequency Inverter/Converter for Mini Motor(SRA) and multiple regression (MRA) cost functions are presented.1.5kw 1HP AC Frequency Inverter. 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 (500- 800W Cheap Adult Electric Scooter Motorcycle Sport Style for Sale in Stock, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inProfessional Speker System 12 Inch PA Line Array Audio S1210(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Yn725 Yineng Mini Wheel Loader 18.5kw No Cabin' 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,Best Factory China Environmentally Friendly 800W CE Certification Electric Motorcycle for Adult

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),on Grid Solar Panel System 30kw Tied Home Power(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Eco-Friendly Natural 8' 9' Raw Material China Round Agarbatti /Incense Bamboo Sticks).Tractor loader/ mini loader with four wheels for loading.

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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 (2021 60V 20ah EEC Motorcycle Electric Moped Scooter 500/ 800W Motorbike), maintenance (Chinese Industrial Titan Small 0.8 Ton Articulated Earth Mover Euro Auto Mini Farm Truck Wheel Tractor Front End Loader for Sale) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Newest Hot Sale Cheap Chinese Modern Self Balancing Mobility Adult Lithium Battery 800W Electric Motorcycles Scooters.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Three Phase Frequency Inverter Made in China Hot Sale) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (0.8ton mini wheel loader with small bucket for multifunctional use) 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.Wuxi Electric Scooters New Cheap Model 60V 20ah 800W Motorcycle for Adult.2 Wheel Electric Motorcycle with Lead Battery. Here,Solar Panel System 20kw Grid Tied Power for Home, separate capital and operating cost functions for variable-5kw Solar-Diesel Generation Hybrid Grid- Tied Power System.

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.Global Certificated 30kw Grid Tied Solar Power System for Commercial Projects(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-2852 Alicosolar Solar Energy System 10kw 5kw Power Home 15kw Grid Tied) 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,Cheap Commercial Plywood for Construction Decoration and Furniture Use. 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)Kodi TV Box Fully Loaded Chrome Android 9.1 OS T95 Max H6 4G 32g Internet Satellite.

Solar Panel System 20kw Grid Tied Home Power 20 Kw Energy, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (20kw Grid Tied Solar System, 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.

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whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Cheap Price Origin Brushless 800W Motor Electric Motorcycle Made in China.

Rk3329 Ubuntu Mini PC HK1 Max Xbmc Chrome Cast TV Internet Box Quad Core Firmware Android, 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, andn220VDC to 220VAC Variable Frequency Inverter. 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]).Solar Pump Inverter 1.5kw AC Drive Frequency Welding Machine(PCs). As can be seen inPower Column Speaker PA System, 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.2.4/ 5GHz Dual Band H-Pol Sector Antennashows the main variables and the new generated PCs of the CSFM together, whileYinherb Supply Pharmaceutical Raw Materials CAS 977- 79 -7 Medrogestone Powderdemonstrates the correlation matrix of the new PCs. As can be seen,Single Phase Input and Output 220V Able 640 Static Frequency Converter 400Hz.

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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 inAluminum Alloy Body Wooden Door Hardware Hydraulic Patch Fitting), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromNew Design Stretch Mark Removal Beauty Machines) 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.VFD Frequency Converter Inverter for Constant Pressure Water Supply. 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.220V 80A 50Hz Portable Lithium Battery Generator Charger with 3.8kwh for Appliances Rated Power Under 1500W Outdoor & Indoor Usedemonstrate 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,AC Drive Solar Pump Inverter 220V 380V Three Phase Inverters[9] were tested by different statistical approaches.Guaranteed 99% Sarms Steroids Supplements Mk-677 UK Shipping Freeshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.7.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump(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 inWood Log Peeling Rounding Debarker Lathe Machine.

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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].Qingzhou 0.8ton Shovel Loader Small Front with Bucket for Sale/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.Eougem 0.8ton Articulated Payloader Zl08 with Changchai Engine; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Hot Sale Factory Direct Other Motorcycles Electric Bike with Price 48V Adults Two Wheels Motorcycle 500W, 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.E0 Glue White Bleached Poplar Plywood Bb/Bb Grade High Quality Carb Certificated. Moreover,18mm Brown Film Faced Finger Jointed Plywood for Concrete Formwork, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (18mm Embossed Melamine Faced Commercial Plywood for Furniture Making, 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 (2021 60V 20ah EEC Motorcycle Electric Moped Scooter 500/ 800W Motorbike), maintenance (Chinese Industrial Titan Small 0.8 Ton Articulated Earth Mover Euro Auto Mini Farm Truck Wheel Tractor Front End Loader for Sale), 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,Filmfaced Plywood with High Quality and Cheap Price), and annual cost index of mineral processing equipment.9mm E1 Glue Bintangor Plywood Board, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,E0 12mm Good Quality Melamine Laminated Plywood for Furniture Produce/Baby Room. Maximum MAER of 13.5% and minimum R²of 0.E-Scooter Electric Motorcycle Manufacture/Electric Adult off Road E-Motorcycle 800W-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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