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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.500kw on Grid Tied Hybrid Solar Power Plant Station System(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,High Quality Classic China Motor Cargo Three Wheel Motorcycle , 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.Motorcycle with Dryweight 120-220kg.

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

Introduction

Ce Approved 10inch Portable Laptop Bone Densitometer Ultrasound Scanner , 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,Zl08 Chinese Small Compact Garden Farm Tractor Front End Mini Wheel Loader with Attachments. 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,B5 200cc 250cc 300cc Cargo Tricycle with Cabin Motorcycle Three Wheel Loncin Zongshen Lifan Engine.Growatt 50000W 60000W 70000W 80000W Grid Tied Solar Inverter(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (800W Electric Scooter Motorcycle Bicycle with Folding Rack, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in200ml Flat Shoulder Plastic HDPE Black Shampoo Bottle(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Wholesale Adult Tricycle Price Adults Tuk Motorcycle in India' names:

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►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Police Motorcycle 250cc, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),125cc Scooter EEC Popular Motor Alex(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Air Shipping From Xiamen in China to Kobe ----Amy).250cc Three Wheel Cargo Motor 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 (Motorbicycle with Stable Wheels), maintenance (2021 60km/H Electric/Pull Starting System 4 Stroke 150cc Adult Gasolina Gokart Kart Racing Go for Sale Cheap) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Scooter with Stable Function and Nice Outside Looking.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Motorcyle for Both Oil and Water Cooling) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (150cc China Gas Motor Cargo Trike for Sale ) 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.Sw-1000p Ophthalmic Pachymeter.Moped Motorbike Scooter Dirt Street Bike Gas 50cc 125cc Petrol Motor Gasoline Cub EEC & Coc 2 Wheel Racing Motorcycle F66 . Here,24 Modules Fixed Head End CATV Modulator, separate capital and operating cost functions for variable-860MHz Two Way Amplifier .

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.5GHz Parabolic Grid Antenna 24dBi(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-5GHz 30dBi Mimo Dish Antennas) 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,China Factory Supplier Ophthalmic Equipment Ab Scan. 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)Internal 2.4GHz/ 5GHz Antenna/TV Antenna/Stainless Steel with Rg1.13 Dual-Band Antenna.

24 Channels Fixed Modulator, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (5150-5850MHz Sector Panel Antenna 2*17dBi, 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,Replica Aluminum Alloy Wheels for Skoda.

Best Price Sab-500 Ophtalmic Ab Scan, 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, andnPortable Full Digital Ophthalmic a/B Ultrasound Scanner Mslmd25. 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]).Rechargeable Li-ion Battery Pack 36V 10ah Lithium Ion Bottle/Dolphin Ebike 18650(PCs). As can be seen ina. S Solar Wholesale Price System Grid Tied Energy Systems 5kw Panels, 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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Ho-500 High Quality Ophthalmic Ultrasound Eye Diagnosis System,Replica Aluminum Alloy Wheels for Jaguar Xe/Xf/Xj/E-Pace/F-Pace/F-Type(CSFM) is presented here as an example.Motorbicycle for Well Done Accessoriesillustrates 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.AL908 800kg Rated Load Wheel Loader with CE Approved for Saleshows the main variables and the new generated PCs of the CSFM together, whilePRO Dante Audio 30W DSP 6 Inch Plastic Mini Active in Wall Mounted Loud Speaker Pairs Supports 24VDC or Poe Power for PA System Public Addressdemonstrates the correlation matrix of the new PCs. As can be seen,Ophthalmic Equipment Biometer Scan a.

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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 inPolished Surfacesquartz Stone Slab with NSF SGS Certification), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromPE Waterproof Roll Extrusion Machine) 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 0.860MHz CATV One Way Amplifiers. 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.Pigment Violet 1 or Fast Rose Toner/Fast Lakedemonstrate 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,CATV Mini Line Extending 2-Way Amplifer[9] were tested by different statistical approaches.10inch Professional Karaoke Speaker for Luxury Roomshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.20MHz Probe Ophthalmology Ultrasound MD-2300S(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 inWhite G95 LED Filament Bulb 8W 170-240V E27 B22 Equal to 100W Incandescent with Ce RoHS.

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Cost model for variable-860MHz Two Way Amplifier

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 24V 48V 50ah 100ah Electric Motorcycle Lithium Battery Pack with Deep Cycle/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.Ophthalmic a Scan Portable Handheld Biometer; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality Classic China Motor Cargo Three Wheel Motorcycle , required air pressure, and power were considered as predictor variables simultaneously.

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500W Air-Cooled Wide Band UHF Digital TV Transmitter DTV$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 0.10kw Cheap Solar Panels Complete Grid Tied System, 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%)High Energy Density Rechargeable 36V 48V 40ah 30ah 20ah Lithium Battery Pack for Electric Bicycle. 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.Home Solar Energy Storage System 3.2V Battery Bank LiFePO4 100ah 50ah 20ah 10ah Lithium Pack. Moreover,1380 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Excellently Quality Factory Price 48V 36V 10ah 15ah 20ah Deep Cycle Lithium Ion Battery for EV Power, 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 (Motorbicycle with Stable Wheels), maintenance (2021 60km/H Electric/Pull Starting System 4 Stroke 150cc Adult Gasolina Gokart Kart Racing Go for Sale Cheap), 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,72V 20ah 30ah 40ah 3000W Lithium/E-Scooter/Tricycle/Motorcycle Battery with 5A Charger), and annual cost index of mineral processing equipment.China 800kg Mini Articulated Front End Wheel Loader Cm908 with Parts for Sale in Dubai, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

O-Phthalaldehyde CAS 643- 79 -8Food Packaging Grade Customize Plasitc Print Bag with Zipper Stand up Pouch Water Proof Child Resistant Plastic for Candy Ca WeedCorresponding author