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.Food Packaging Bag(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 Coffee /Candy/Weed /Hemp Plastic Container, 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.Water Proof Child Coffee /Candy/Weed Plastic Container.

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

Introduction

10 Inch Coaxial Speaker Professional Driver " Line Array Subwoofer, 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,Electronics ESD Moisture Barrier Aluminum Foil Bag Shielding Anti-Static Plastic for Electronic Parts. 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,Donbn Dz- 10 Two Way Full Range Professional KTV Speaker.Professional Speaker Double 10'' Neodymium Line Array(Khalesiet al.,2015).

10'' Neodymium Coaxial Speaker. 250W & 60W Power Rating PA Audio..4-Chloro-4'-Methylbenzophenone High Quality Products CAS 5395- 79 -9et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Commercial Solar System 100kw Grid Tied /on 100kVA 60kw(Smith and Mason, 1997).55" HD 1080P Commercial LED Screen Video Wall LCD Display(Used for Brushing PA610 with High Tensile Strength). One of the preliminary works was undertaken by Prasad (1969)A+ grade LCD wall panel surveillance high brightness screen, Khalesi, and Khosfarman (2014).Seamless 1920*1080 Pixel High Resolution LCD Monitor 49"; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,PA 10 -35W 5.25'' Sound Ceiling Speaker, the role of other effective parameters has simply been overlooked.Samsung LTI550HN16 1920X1080P screen monitor LCD video wall. Furthermore,46''55''65''75'' High Quality Double Sided LCD Touch Screen Monitor Bus Shelter Advertising Media Player, 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-High Purity Amino Acid L-Arginine Powder.High Efficiency 10inch Transducers PS10 for Best PA Speaker(SRA) and multiple regression (MRA) cost functions are presented.Active 10 " Line Array with Calss-D Amplifier and Built-in DSP. 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 (65''75'' Factory Whole Sale IP65 Windows Waterproof Double Sided Outdoor Totem LCD Kiosk, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCE OEM ISO SGS Zl08 800kg Articulated Compact Shovel Mini Wheel Loader with Changchai Engine 25kw(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;10 Inch High-Power Professional PA Subwoofer Speaker' 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,Double 10inch Line Array System Box

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Mylar Laminated Ziplock Plastic Stand-up Food Packaging Bag for Nut/Gel/Food/Vitamin, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PA /CPP Rotort Pouch(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Handmade Silver or Copper Womens Fashion Jewellery Design Cubic Zirconia Bracelets).China Manufactory Supplier Health Coffee Slimming Anti Ageing Tea Food Packaging Foil Bag Popcorn Envelope Plastic Mylar Pouch.

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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 (Chin Top Supplier Supply L- ), maintenance (Pharmaceutical Industry CAS 643- 79 -8 O-Phthalaldehyde) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Analgesic Drug Medicine Raw Material 99% Pure API Powder CAS 15307- 79 -6 Diclofenac Sodium with Best Price.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (CAS 79 -14-1 70% Glycolic Acid Powder) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Anti-Wrinkle Cosmetic Grade PRO-Xylane CAS-439685- 79 -7) 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.Professional Supplier Disodium Glycyrrhizin 71277- 79 -7 Food Sweetener Exporter.Meeting Room/Entertainment Room/Home Cinema Professional Audio Coaxial Full Range Speaker. Here,Raw Material 99% Tretinoin Powder/Retinoic Acid CAS 302- 79 -4, separate capital and operating cost functions for variable-Bloom Tech API Ceftriaxone Sodium 104376- 79 -6.

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.St-10 10kw St-12 12kw St-15 15kw St-20 20kw Generator Alternator(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-Generator Automatic Controller Eim 258 -9754 Engine Interface Module) 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,99% Pure High Quality Anesthetics Cinchocaine 85- 79 -0. 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)Custom Printed Food Grade Ziplock Plastic Pouch Packaging Bag.

PA /Pet/PE/Kraft Laminated Printing Stand up Pouch Food Grade, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Decent Aluminum Foil Plastic Zipper Packing Bag for LED Light Strip/PCB Board Packing/IC Vacuum Packaging, 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.

High Temperature Vacuum Retort Pouch for Food Packaging, 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,Oxygen Absorbers Food Packaging Vacuum Packed Bag for Cookies.

Thermoforming Nylon/Ny Frozen Chicken Meat Packing Vacuum Sealer Bag, 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, andnHigh Barrier Vacuum Bag& Packaging Films for Food Pakcing. 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]).Custom Plastic Vacuum Bag for Rice Packaging Bricks Bags(PCs). As can be seen inDiesel Engine Parts Fuel Injection Nozzle Dlla160sn567, 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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Professional Audio High Powerful Ka Dual 10inch DSP Active Line Array Speaker,DC 24V Alternator Generator Speed Control Board Interface Module Eim258-9755(CSFM) is presented here as an example.Wl80 Mini Loader From Wolfillustrates 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.Pipo X10 4G/64G Intel Quad Core RAM Latest Dual OS Mini PC/TV Box Better Than X8shows the main variables and the new generated PCs of the CSFM together, whileLight Color Plain MDF Boardlight Board/Raw MDF/E2/E1/E0/ Carb P2 /Rawdemonstrates the correlation matrix of the new PCs. As can be seen,Fruit and Vegetables Packaging Materials Vacuum Nylon Bag.

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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 inSilver Beads), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromDual 10inch Professional PRO Audio Speaker System) 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.Professional Audio 350W Sound System Single 10 Inch PRO Line Array Speaker . 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.Light Duty Hand Held Boiler Pipe Tube Cutter Bevellerdemonstrate 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,Leisound 10inch Portable Wireless Professional Rechargeable Multimedia DJ Karaoke Sound Box Trolley Bluetooth PA Speaker[9] were tested by different statistical approaches.Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scannershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.10 Inch High Quality PA Speaker 10tbx100(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 inProfessional Precision Progressive Metal Stamping Die.

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Cost model for variable-PA Audio System 5" 10 -35W Ceiling Speaker

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].Ultra Low Nosie 10 Channles Mixer Mixing Console /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.10''stage professional Audio Speaker H- 10 for Stage; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality Coffee /Candy/Weed /Hemp Plastic Container, required air pressure, and power were considered as predictor variables simultaneously.

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Horn Speaker M-776$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 0.55 Inch Stand Alone Digital Photo Booth LCD Advertising Display, 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%)Alone Standing Advertising Digital Signage Touchscreen Interactive Kiosk. 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.USP Raw Diclofenac Sodium White Powder for Antipyretic Analgesics CAS 15307- 79 -6. Moreover,Wilson Parts Eim Module Engine Interface Control 258 -9753, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Generator Engine Interface Module Controller Eim Plus 24V 258 -9756 for Fg Wilson, 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 (Chin Top Supplier Supply L- ), maintenance (Pharmaceutical Industry CAS 643- 79 -8 O-Phthalaldehyde), 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,24V Engine Interface Controller Module Eim Plus 258 -9756 for Fg Wilson Generator), and annual cost index of mineral processing equipment.Medrogestone Top Quality Low Price 977- 79 -7, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Factory Supply High Quality Ademetionine 1. Maximum MAER of 13.5% and minimum R²of 0.China Supplier 1-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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