GENERAL PAPERS

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S. Arfania; A.R.Diesel Engine Parts Fuel Injection Nozzle Dlla140s64fChinese Everun Zl08 800kg 0.8 Ton Compact Small Mini Wheel Loader with Snow Bucket; M.R. Khalesi

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.Diesel Engine Parts Fuel Injection Nozzle 149s715(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,Auto Feeding Inner Mounted Pipe Tube Beveling Engine, 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.Tws True Wireless Headphone Earbud Bluetooth 5.0 New Design.

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

Introduction

Diesel Engine Parts Fuel Injection Nozzle 150s355A, 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,Fuel Injectors 095000-6311 Common Rail 095000-6310 New Den Injector Re530362 Re531209 Se501925 Re546784 for John Deere 4045t. 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,Diesel Engine Parts Fuel Injection Nozzle 140sn634.Diesel Engine Parts Fuel Injection Nozzle 147sm327(Khalesiet al.,2015).

Diesel Engine Parts Fuel Injection Nozzle 150s364A.Diesel Engine Parts Fuel Injection Nozzle 150s424n470et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Diesel Central Drive Three Wheel Dumper for Sale(Smith and Mason, 1997).Wireless Headphone Tws Bluetooth Earphone for Phone(2.4- 5GHz MIMO Omni Antenna). One of the preliminary works was undertaken by Prasad (1969)Headset Tws Wireless Earphones Mini Earbuds Stereo Headphones Bluetooth 5.0, Khalesi, and Khosfarman (2014).Bluetooth V5.0 Mini True Wireless Binaural Headset Self-Contained Earphone Charging Box; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,L18 Tws Bluetooth V5.0 Stereo Music Earbuds Headset, the role of other effective parameters has simply been overlooked.Mini L18 Tws V5.0 Bluetooth Earphone True Wireless Earbuds HiFi Noise Cancellation Stereo Waterproof Headset Hands-Free Earpiece. Furthermore,L18 Wireless Bluetooth 5.0 Tws Stereo Earphone with Charging Box, 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-Double End Single Side Acrylic Freestanding Tub.Cheap Plastic Raw Material Granules Black Masterbatch(SRA) and multiple regression (MRA) cost functions are presented.Portable On-Site Pipe Tube Chamfering Chamfer Machine. 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 (American Standard Oval Freestanding Thick Rim Bath Tub Made in China, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inJwell-PLA Pet Sheet Recycling Cup Packing Making Extrusion Machine(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Grey Masterbatch for Plastic Chair' 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,Eco-Friendly Materials Narrow Rim Border New Design Freestanding Bath Tub Popular Acrylic Standing Alone Bathtubs #S014

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Stand Alone Tub Small Oval 55 Inch Free Standing Acrylic Bathtub, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Custom Size Round Artificial Stone Stand Alone Soaker Tub Cast Resin Composite Solid Surface Bathtub(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Italian Design Latest Iron Glass Tube Gold Chandelier Pendant Light Fixture).Disodium Phosphate Anhydrous as Emulsifier in Food Industry.

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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 (Air Drive Multiple Capable Loose Tubes Pipes Beveling Machine), maintenance (ISY SDC TCM ID Mounted Pipe Beveling Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Diesel Engine Parts Fuel Injection Nozzle 156sm420.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Diesel Engine Parts Fuel Injection Nozzle 160sn827) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Disodium Hydrogen Phosphate Dihydrate Food Grade) 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.Scarlet/ Violet / Purple/ Golden/Green Pigment Paste.Scarlet/ Violet / Purple/ Golden/Green Pigment Paste. Here,Diesel Engine Parts Fuel Injection Nozzle 142s1173, separate capital and operating cost functions for variable-Ammonium Polyphosphate .

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.Scarlet/ Violet / Purple/ Golden/Green Color Paste(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 Efficiency Thick Wall Pipe Pipeline Piping System Beveling Machine) 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,Industry Grade Ammonium Polyphosphate. 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)Light Duty Hand Held Boiler Pipe Tube Cutter Beveller.

Scarlet/ Violet / Purple/ Golden/Green Pigment Paste, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Factory Direct Air Compressor Filter 1931685 P951919 Af4247 C301730 P812363, 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.

Embossed PC Solid Sheet Extruder Machine Making Extrusion Line, 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,Anti-Scratch PC Polycarbonate Impact Solid Sheet Extrusion Machine.

Scarlet/ Violet / Purple/ Golden/Green Pigment Paste, 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, andnDiesel Engine Parts Fuel Injection Nozzle 132s1320. 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]).Scarlet/ Violet / Purple/ Golden/Green Pigment Paste for Printing and Dyeing(PCs). As can be seen inDisodium Phosphate Anhydrous CAS No 7558- 79 -4, 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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T-Type Electric Beveling Machine ,3293 Fast Rose Lake B Pigment (CSFM) is presented here as an example.Wholesale 1L Round Empty Fully Synthetic Brake Oil Tin Can with Metal or Aluminum Capsillustrates 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.Factory Outlet Dog Tag Laser Marking Machine for Metal 50Wshows the main variables and the new generated PCs of the CSFM together, whileFrequency Converter 200HP Three Phasesdemonstrates the correlation matrix of the new PCs. As can be seen,O2 Oxygen Sensor for Honda Accord 2.3L 4 Cyl F23A4 2000-2002 234-9014.

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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 inOutdoor Nylon Anti Theft Laptop Back Pack OEM Luxury Ladies Bag Backpack Women Wholesale Leather School Backpacks Custom Waterproof Designer Fashion), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromQuick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance) 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.Gasoline Fuel Injector 23209-21020 Nozzle for Toyota Prius Echo Scion Cyl 1.5L 1nz. 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.Cute Cheap Electric Scooter for Lady of 60V800W20ah From Chinademonstrate 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,Pigment[9] were tested by different statistical approaches.12V RGB Resin Filled Underwater Pool Lights with 2 Years Warrantyshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Flame Retardant Ammonium Polyphosphate (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 in10oz Daily Use Ceramic Mug with Custom Logo Coffee for Promotion.

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Cost model for variable-Plastic Sheet Machine PC Polycarbonate Solid

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].PMMA GPPS Sheet/Board Plastic Extruder Machine/Making Machine/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.PC/PMMA/GPPS Optical Plate/Board Extrusion Making Machine/Extruder; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Auto Feeding Inner Mounted Pipe Tube Beveling Engine, required air pressure, and power were considered as predictor variables simultaneously.

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PC/Polycarbonate/GPPS/PMMA Sheet Extruder Machine/Plastic$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.Uns S31254 En 1.4547 F44 Price Per Kg Super Austenitic Stainless Steel Round Bar Rod, 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%)Super Duplex Stainless Steel Bar by Zeron100 . 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.S32750 Uns Super Duplex Stainless Steel Bar. Moreover,Against Wall Australian Freestanding Acrylic Bathtubs, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (2507 Uns S32750 Duplex Stainless Steel Sheet / Plate, 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 (Air Drive Multiple Capable Loose Tubes Pipes Beveling Machine), maintenance (ISY SDC TCM ID Mounted Pipe Beveling Machine), 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,Endless Pool), and annual cost index of mineral processing equipment.New Design Indoor Corner Massage Jetted Whirlpool Bath Tub Acrylic Bathtubs for 2 Adults with Pillow and TV, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Outdoor Jet Surf Massage Bubble SPA Swimming Pool Hot Tub Combo. Maximum MAER of 13.5% and minimum R²of 0.Plastic Products Colorful Pellets Resin Raw Material Light Green Color Antistatic Masterbatch Customized-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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