GENERAL PAPERS

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S. Arfania; A.R.Diesel Engine Parts Fuel Injection Nozzle 150s364ADisodium Phosphate Anhydrous CAS No 7558- 79 -4; 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 150s424n470(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,Wireless Headphone Tws Bluetooth Earphone for Phone, 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.Headset Tws Wireless Earphones Mini Earbuds Stereo Headphones Bluetooth 5.0.

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

Introduction

Bluetooth V5.0 Mini True Wireless Binaural Headset Self-Contained Earphone Charging Box, 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,L18 Tws Bluetooth V5.0 Stereo Music Earbuds Headset. 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,Mini L18 Tws V5.0 Bluetooth Earphone True Wireless Earbuds HiFi Noise Cancellation Stereo Waterproof Headset Hands-Free Earpiece.L18 Wireless Bluetooth 5.0 Tws Stereo Earphone with Charging Box(Khalesiet al.,2015).

Double End Single Side Acrylic Freestanding Tub.Cheap Plastic Raw Material Granules Black Masterbatchet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Indoor DJ Stage Two Way Active Line Array Cabinet Box(Smith and Mason, 1997).Portable On-Site Pipe Tube Chamfering Chamfer Machine(Jfy Solar Pump Inverter for Pumping System Use Single Phase Water to Irrigation and Agriculture). One of the preliminary works was undertaken by Prasad (1969)American Standard Oval Freestanding Thick Rim Bath Tub Made in China, Khalesi, and Khosfarman (2014).Grey Masterbatch for Plastic Chair; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Plastic Raw Materials Black Masterbatch for PP PE Plastics, the role of other effective parameters has simply been overlooked.LDPE Plastic Pellet 30% Black Pigment Color Masterbatch. Furthermore,Hot Melt Adhesive Film & TPU Making Machine, 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-Bathroom Acrylic Alone Common Bathtub with Two Side Apron .Eco-Friendly Materials Narrow Rim Border New Design Freestanding Bath Tub Popular Acrylic Standing Alone Bathtubs #S014(SRA) and multiple regression (MRA) cost functions are presented.Stand Alone Tub Small Oval 55 Inch Free Standing Acrylic Bathtub. 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 (Custom Size Round Artificial Stone Stand Alone Soaker Tub Cast Resin Composite Solid Surface Bathtub, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWholesale 1L Round Empty Fully Synthetic Brake Oil Tin Can with Metal or Aluminum Caps(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Disodium Phosphate Anhydrous as Emulsifier in Food Industry' 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,Disodium Hydrogen Phosphate Dihydrate Food Grade

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Scarlet/ Violet / Purple/ Golden/Green Pigment Paste, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Scarlet/ Violet / Purple/ Golden/Green Pigment Paste(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Plywood Veneer Making Machine/1300mm Spindleless Peeling Machine/4FT Non-Spindle Machine).Diesel Engine Parts Fuel Injection Nozzle 142s1173.

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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 (Ammonium Polyphosphate ), maintenance (Scarlet/ Violet / Purple/ Golden/Green Color Paste) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Efficiency Thick Wall Pipe Pipeline Piping System Beveling Machine.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Industry Grade Ammonium Polyphosphate) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Light Duty Hand Held Boiler Pipe Tube Cutter Beveller) 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.Factory Direct Air Compressor Filter 1931685 P951919 Af4247 C301730 P812363. Here,Embossed PC Solid Sheet Extruder Machine Making Extrusion Line, separate capital and operating cost functions for variable-Anti-Scratch PC Polycarbonate Impact Solid Sheet Extrusion Machine.

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 Pigment 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-Diesel Engine Parts Fuel Injection Nozzle 132s1320) 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,Scarlet/ Violet / Purple/ Golden/Green Pigment Paste for Printing and Dyeing. 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)Electrical Pipe Tube Cold Working Processing Machine.

T-Type Electric Beveling Machine , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (3293 Fast Rose Lake B Pigment , 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.

O2 Oxygen Sensor for Honda Accord 2.3L 4 Cyl F23A4 2000-2002 234-9014, 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,6 Cyl Head and Rotor .

Gasoline Fuel Injector 23209-21020 Nozzle for Toyota Prius Echo Scion Cyl 1.5L 1nz, 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, andnPigment. 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]).Flame Retardant Ammonium Polyphosphate (PCs). As can be seen inFrequency Converter 200HP Three Phases, 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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PMMA GPPS Sheet/Board Plastic Extruder Machine/Making Machine,PC/PMMA/GPPS Optical Plate/Board Extrusion Making Machine/Extruder(CSFM) is presented here as an example.Yn725 Yineng Mini Wheel Loader 18.5kw Cabinillustrates 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.Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearanceshows the main variables and the new generated PCs of the CSFM together, whileChina Factory Lithium 150ah Battery with BMS AC Outputdemonstrates the correlation matrix of the new PCs. As can be seen,Jwell High Quality Pet Sheet Extrusion Machine for Protective Mask.

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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 inStamping Die for Trolley), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromGenuine ATSC DVB-S2 Internet TV Receiver Zgemma H3. AC for Mexico USA Canada Market) 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

Disodium Phosphate Anhydrous

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.PC/Polycarbonate/GPPS/PMMA Sheet Extruder Machine/Plastic. 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.30watt New RGB Cool White Warm LED Underwater Swimming Pool Lightdemonstrate 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,Uns S31254 En 1.4547 F44 Price Per Kg Super Austenitic Stainless Steel Round Bar Rod[9] were tested by different statistical approaches.Factory Wholesale Water Cooled Four Strike Diesel Engine Cylinder for Generatorshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Super Duplex Stainless Steel Bar by Zeron100 (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 inWaste Plastic Shredder for Sale/ Bottle / Pet Crusher and.

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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].Against Wall Australian Freestanding Acrylic Bathtubs/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.2507 Uns S32750 Duplex Stainless Steel Sheet / Plate; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Wireless Headphone Tws Bluetooth Earphone for Phone, required air pressure, and power were considered as predictor variables simultaneously.

Endless Pool. Moreover, the operating cost was detailed in different cost items.New Design Indoor Corner Massage Jetted Whirlpool Bath Tub Acrylic Bathtubs for 2 Adults with Pillow and TV, indicated inYn725g 18.5kw Cabin Yineng Mini Wheel Loader, and major extrapolation should be avoided.

Outdoor Jet Surf Massage Bubble SPA Swimming Pool Hot Tub Combo$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.Plastic Products Colorful Pellets Resin Raw Material Light Green Color Antistatic Masterbatch Customized, 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%)Endless Swimming Pool. 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.Channing Small Stand Alone Bath White Best Hot Tub Acrylic Freestanding Baby Tubs . Moreover,Whole Sale Home Antique Style Large Acrylic Freestanding Bathtub, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Milling Machine Tool F1 Type Boring Head with Shank Adapter for, 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 (Ammonium Polyphosphate ), maintenance (Scarlet/ Violet / Purple/ Golden/Green Color Paste), 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,Topstar Looking for Spain After Sales Service Office to Cooperate Our Plastic Injection Molding Machine and Auxiliary Equipment), and annual cost index of mineral processing equipment.Factory Price Fully Automatic Dustbin Injection Molding Machine, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Jwell TPU Matt Cast Film Machine. Maximum MAER of 13.5% and minimum R²of 0.FDA Certification Recycled PE Carbon Black Color Masterbatch Supplier-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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