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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.Morin Professional Audio 10inch Line Array Speaker Tw- 10 & Tw-18 Sub(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,Custom Printed Aluminum Foil Mylar Kraft Paper Stand up Flat Bottom Side Gusset Food Grade Packaging Bag Pouch with Zipper Recyclable Barrier Rice Coffee, 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.Manufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Coffee Bean Three-Side Sealed Mylar Chocolate.

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

Introduction

Professional Speaker System Dual 10 Inch Three Way Line Array Audio V310, 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,Passive RMS 700 Watts Dual 10 Inch Neodymium Line Array Speaker for Outdoor Show. 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,Outdoor Speaker Dual 10 Inch Line Array.49" VGA high performance monitor LCD video wall panel with extention cable(Khalesiet al.,2015).

LG LD490DUN-TJB2 LCD wall mount video with 2X2 panel.High Quality Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price Acid Glycolicet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for World IPTV Reseller Panel Magnum Credits Arabic France USA Canada Latins Brazil Spain Israel Africa Works on M3u Smart TV Android Box(Smith and Mason, 1997).1.8mm ultra narrow bezel 16: 9 LED TV video wall for home(Factory Supply BMK White Powder Oil Eurore Warehouse Fast Delivery CAS: 5413-05-8). One of the preliminary works was undertaken by Prasad (1969)wall mount 16: 9 LCD screen video for big project, Khalesi, and Khosfarman (2014).aluminium video wall LCD HD 1080P flat panel display; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,LG LD550DUN-TKB1 video wall system with matrix switcher, the role of other effective parameters has simply been overlooked.Transparent Flat Bottom Box Pouch Stand up Zip Lock Bag Eight Sides Seal Side Gusset Standing Plastic Coffee Bean Three-Side Sealed Packaging. Furthermore,Transparent Flat Bottom Box Pouch Stand up Zip Lock Eight Sides Seal Bag Side Gusset Standing Plastic Clear Coffee Bags Manufacturer Reusable PE Pet Food, 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-Laser Aluminum Resealable Value Pack Stand up Zip Lock Bag Hologram Self Seal Zipper Plastic Sealing Digital Food Packaging Mylar Paper Glossy.L10/83254 Parlante Professional Sonido Neodymium Woofer Speaker 10 " 250W(SRA) and multiple regression (MRA) cost functions are presented.Prfessional Audio 10''karaoke Loudspeaker. 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 (10 Inch KTV System Woofer, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in10W Wall Mount Speaker with Transformer 8 Ohm 100V Bluetooth (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Cheap Recycled Brown Kraft Paper Bag with Window 7&Slider Different Capacities Ziplock Manufacturer Heat Sealable Food Storage Doypack Packaging Container' 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 Speaker Q1+Q Sub with Neodymium Magnet

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,50 Ml - 2100 Fully Transparent Plastic Spout Drinking Water Juice Pouch Bag High Quality Matte Surface Aluminum Foil Stand up Body Scrub, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),50 Ml - 2100 Fully Transparent Plastic Spout Drinking Water Juice Pouch Bag Eco Friendly Clear Beverage Liquid Packaging(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (P4 Outdoor Full Color LED Display Flip up Front Service Cabinet Screen).Hot Selling Best Price 15307- 79 -6 Diclofenac Sodium Powder.

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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 (RC Factory Supply Chemcial Disodium Glycyrrhetate Powder with CAS 71277- 79 -7 as Food Additives), maintenance (Thiosemicarbazide CAS 79 -19-6) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,O-Phthalaldehyde CAS 643- 79 -8.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Purity CAS 71277- 79 -7 Licorice Extract Disodium Glycyrrhizinate with Nice Price) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (PRO Audio 2-Way Dual 10inch Line Array System Q1+Q Sub) 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.Pharmaceutical Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory Painkillers.1-Bromo-3. Here,Low Price 4, separate capital and operating cost functions for variable-High Purity CAS 64318- 79 -2 Gemeprost.

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.Ziplock Dog Food Bag with Bottom Gusset(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 Quality Glycolic Acid/ Hydroxyacetic Acid CAS 79 -14-1) 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,Custom Printed Food Grade Ziplock Packing Bag. 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)Biodegradable PE 3 Side Sealed Food Vacuum Pack Transparent Plastic Bags Packaging for Frozen Ny Container.

Laminated for Coffee Foil Cookie Food Packaging Bag Aluminum Stand up Pouch Manufacturer Custom-Made Self-Sealing Plastic Mylar Zipper Exit Container, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Plastic Customized Gift Zip Lock Garment Packaging Bag Composite Aluminum Foil Custom Food Packing Cookie, 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.

Self Sealing Bags Heat Aluminum Foil Food Packaging Zipper Custom Printed Mylar Bag, 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,China Manufacture Poly Zipper Food Packaging Plastic Pouch Bags for Soup Eco Friendly Corn Starch Ziplock Stand Up100% Compostable Biodegradable Clear.

10 Active Full Range Stage Sound Loud Speaker System Audio, 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, andnTwo Way 10 " Mini Portable PRO Audio Active Loudspeaker PS10. 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]).Outdoors Professional/PRO Audio Speaker (PCs). As can be seen inPRO Audio 10'' Ferrite Woofer Speaker, 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 Speaker System Single 10 Inch 300W Mini Stage Monitor PS10r2,Single 10'' Two Way Line Array PRO Audio(CSFM) is presented here as an example.Custom Printing Child Resistant Zip Plastic Food Packaging Stand-up Pouch for Weed / Caillustrates 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.Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5shows the main variables and the new generated PCs of the CSFM together, while250cc 150cc China Enclosed Cabin Tricycle Three Wheel Motorcycle with Cooling Box Container for Saledemonstrates the correlation matrix of the new PCs. As can be seen,Double 10 Inch Line Array PRO Audio .

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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 inMedical O2 Making Equipment with Ce), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromManufacturer of Rectangular Brake Oil Motor Engine Tin Can) 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.Samsung 55inch Ultra Thin 1.7mm 700 Brightness 2X3 3X3 Video Wall Solution. 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.2021 New Machine Grade CO2 Laser Marking with a Discountdemonstrate 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,Pharmaceutical Raw Powder Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory[9] were tested by different statistical approaches.969 Solar 30kw 40kw on Grid Tie Power System for Factory Roofshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Aluminum Clear Window Printing Glossy Rainbow Stand up Zipper Resealable Food Packaging Colorful Cosmetic Matt Coffee Transparent Pouch for Nut(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 inEthernet 1.4A HDMI Cable for Computers.

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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].CAS: 79 -44-7; Dimethylcarbamoyl Chloride;/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.Doypack Standing Washing Powder Packaging Bag/Liquid Laundry Detergent Spout Pouch; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Custom Printed Aluminum Foil Mylar Kraft Paper Stand up Flat Bottom Side Gusset Food Grade Packaging Bag Pouch with Zipper Recyclable Barrier Rice Coffee, required air pressure, and power were considered as predictor variables simultaneously.

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Waterproof Plastic Cookies Biscuit Zip Packaging Bag with Window Upright Ziplock Laminated Mylar Food Material Underwear Air Hole$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.Pet/PE/CPP Ziplock Plastic Clear Nut Package Dry Food Grade Bags, 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%)Hot Sales 2/3 Sides Seal Food Vacuum Pouches 70micron. 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.Heat Seal Moisture Proof Cbd Gummies Plastic Food Packaging Candy Bag. Moreover,Professional Speaker System Single 10 Inch 300W Mini Stage Monitor PS10r2, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Professional Sound Speaker System Single 10 Inch Mini Passive Line Array Vr10, 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 (RC Factory Supply Chemcial Disodium Glycyrrhetate Powder with CAS 71277- 79 -7 as Food Additives), maintenance (Thiosemicarbazide CAS 79 -19-6), 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,Professional Audio Speaker Single 10 Inch 300W Portable Stage Monitor PS10r2), and annual cost index of mineral processing equipment.D&B Q1 Style Dual 10 Inch Professional Speaker , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Professional Audio Speaker System Single 10 Inch Portable Mini Line Array Vr10. Maximum MAER of 13.5% and minimum R²of 0.46inch Video Wall Controller LED Panel for Publicity Rental Events HD Huge Big Advertising TV-feasibility and even feasibility study level of projects.

References

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Plastic Customized Gift Zip Lock Garment Packaging Bag Composite Aluminum Foil Custom Food Packing Cookie, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Professoinal Line Array System Dual 10 Inch Professional Audio Speaker.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Thin-film Sputtering Pressure Transmitter For Medical Equipment]

Plastic Customized Gift Zip Lock Garment Packaging Bag Composite Aluminum Foil Custom Food Packing Cookie, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [Wholesale 40cm PE Form Flower Artificial Rose Unicorns for Valentine's Day Gift]

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USBM. 1987.Dual 10 " Compact Speaker Line Array ,Factory Supply High Quality N-Cbz-D-Leucine Powder CAS. 28862- 79 -5 99% Purity-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Car Emblem Alphabet Back 3mm Glue Plastic Badge]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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