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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.Police Motorcycle 250cc(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,125cc Scooter EEC Popular Motor Alex, 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 0.250cc Three Wheel Cargo Motor Tricycle .

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

Introduction

Motorbicycle with Stable Wheels, 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,2021 60km/H Electric/Pull Starting System 4 Stroke 150cc Adult Gasolina Gokart Kart Racing Go for Sale Cheap. 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,Scooter with Stable Function and Nice Outside Looking.Motorcyle for Both Oil and Water Cooling(Khalesiet al.,2015).

150cc China Gas Motor Cargo Trike for Sale .Sw-1000p Ophthalmic Pachymeteret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for aluminium video wall LCD HD 1080P flat panel display(Smith and Mason, 1997).Moped Motorbike Scooter Dirt Street Bike Gas 50cc 125cc Petrol Motor Gasoline Cub EEC & Coc 2 Wheel Racing Motorcycle F66 (Pain Relleving Patch Topical Lidocaine Spray137-58-6 UK Warehouse Free Sample). One of the preliminary works was undertaken by Prasad (1969)24 Modules Fixed Head End CATV Modulator, Khalesi, and Khosfarman (2014).860MHz Two Way Amplifier ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,5GHz Parabolic Grid Antenna 24dBi, the role of other effective parameters has simply been overlooked.5GHz 30dBi Mimo Dish Antennas. Furthermore,China Factory Supplier Ophthalmic Equipment Ab Scan, 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-Internal 2.4GHz/ 5GHz Antenna/TV Antenna/Stainless Steel with Rg1.13 Dual-Band Antenna.24 Channels Fixed Modulator(SRA) and multiple regression (MRA) cost functions are presented.5150-5850MHz Sector Panel Antenna 2*17dBi. 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 (12" 13 Inch Aluminum Alloy and Steel Wheel for Minicar, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Rasagiline Mesylate API Powder CAS 161735- 79 -1 with Purity! !(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Replica Aluminum Alloy Wheels for Skoda' 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,Ho-500 High Quality Ophthalmic Ultrasound Eye Diagnosis System

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Ophthalmic Equipment Biometer Scan a(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Factory Price 75% Ethyl Alcohol Waterless Hand Sanitizer Antibacterial Gel Wash with Ce&FDA 50ml/100ml /500ml/1L).0-20dB 75 Ohm CATV Variable Adjustable Attenuator Equalizer.

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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 (860MHz CATV One Way Amplifiers), maintenance (CATV Mini Line Extending 2-Way Amplifer) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,20MHz Probe Ophthalmology Ultrasound MD-2300S.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (860MHz Two Way Amplifier ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Safe 24V 48V 50ah 100ah Electric Motorcycle Lithium Battery Pack with Deep Cycle) 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.Ophthalmic a Scan Portable Handheld Biometer.Ebike Battery Pack Li-ion 36V 10ah Lithium for Electric Scooter with Long Cycle Life. Here,Allsparkpower Solar 48V 5kw Inverter 10kwh Lithium Ion LiFePO4 Battery Storage for Home Power System, separate capital and operating cost functions for variable-500W Air-Cooled Wide Band UHF Digital TV Transmitter DTV.

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.10kw Cheap Solar Panels Complete Grid Tied System(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-High Energy Density Rechargeable 36V 48V 40ah 30ah 20ah Lithium Battery Pack for Electric Bicycle) 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,Home Solar Energy Storage System 3.2V Battery Bank LiFePO4 100ah 50ah 20ah 10ah Lithium Pack. 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)1380 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System.

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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.

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whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Everun Er08 CE Wheel Loader with Standard Bucket for Sale.

China Cpm Zl08 Mini Wheel Loaders with Price List 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, andnWholesale Factory 12V 200ah Lithium Ion LiFePO4 Battery 24V. 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]).Loader(PCs). As can be seen inPortable Full Digital Ophthalmic a/B Ultrasound Scanner Mslmd25, 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.1L Metal Screw Top Round Machine Oil Tankshows the main variables and the new generated PCs of the CSFM together, while94% Sodium Tripolyphosphate STPP CAS No: 7758- 79 -4demonstrates the correlation matrix of the new PCs. As can be seen,Covered Tricycle Carriage Closed Cargo Box.

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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 in3 Years Warranty All-in-One Integrated LED Solar Street Light), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromInnopack Food Grade Metal Tin Can for Edible Cooking Oil in Low Price) 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 0.0.8 Ton Garden Samll Loader 800kg Mini Front End 8 7 6 5 4 3.5 3 2.5 2 1.5 1 Wheel. 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.Sofa Set Fabric Velvet Furnituredemonstrate 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,Metal Packing Chemical Round Tin Can[9] were tested by different statistical approaches.Long Using Life Shuttering Plywood with Logo for Constructionshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.1 Liter Cans for Curing Agent(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 inHot air of different quality through non-woven hydrophiles for the manufacture diapers / sanitary napkins.

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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].High Quality 1.2ton Loading Compact Loader Hr912 with Snow Bucket/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.Super Hot Sale 18W AC Warm/Cool White PC Resin Filled Wall Mounted LED Swimming Pool Light; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,125cc Scooter EEC Popular Motor Alex, 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.Manufacturer Promotional Square Metal Tin Can for Tea Coffee Packing. Moreover,Motor Auto Hydraulic Open Three Wheel Motorcycle for Sale, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Hot PC Resin Filled 18W AC RGB Wall Mounted LED Underwater Light with Two Years Warranty, 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 (860MHz CATV One Way Amplifiers), maintenance (CATV Mini Line Extending 2-Way Amplifer), 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,20watt Mopa Laser Marking Machine for Anodized Aluminum Black), and annual cost index of mineral processing equipment.Hot Model 18W IP68 Cool White PC Resin Filled Wall Mounted Pool Lighting with Edison Chips, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,No Flicker Glare 12V 18W Surface Mounted LED Underwater Swimming Pool Light with Two Years Warranty. Maximum MAER of 13.5% and minimum R²of 0.2021 New E Bike Best Mini Electric for Adults-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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