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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.Custom Printing Food Packaging Plastic Bags with Resealable Zipper(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,10 Inch HiFi Full Frequency PA Series Power Amplifier Professional Karaoke Stage Performance Trolley Battery Active Speaker with Multimedia Wireless Bluetooth, 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.Karaoke Speaker 10'' Ferrite KTV Loudspeaker Portable for System..

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

Introduction

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Methodology

Data

Thirty-seven major flotation machines (Supply High Quality L-Lactic Acid with CAS 79 -33-4, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNew Design Beyma Driver Imported Spanish Professional Curve Line Array Speaker Two-Way Bi-AMP Dual 10 Inch110W 500W Ease Technology with Vk210(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Lanosterol 79 -63-0 ' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),China Factory Price Chlorhexidine Diacetate CAS 206986- 79 -0(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (PCD Drawing Dies Diamond Wire Die Tungsten Carbide Spiral Mold).Plastic Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Resealable Beef Nuts Rice Coffee Cereal Tea 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 (Dual 10 Inch Rated Power 700 Watts Italian Neodymium Drivers Active Line Array System), maintenance (High Purity and Good Price Glycolic Acid ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Heat Seal Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Resealable Beef Nuts Rice Coffee Cereal Tea Pouch.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (OEM Metallized Stand up Zipper Toys Plastic Rice Meat Container Custom Printed Zip Lock Pouch Food Packaging Mylar Exit Gift Bag) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (10 Inch Powered PA Speaker Full Range Stereo System) 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.Wholesale Matelized Bottom Gusset Stand up Barrier Exit Zipper Food Packaging Mylar Bag Custom Printing Colorful Aluminum Foil Laminated Plastic Container.Biodegradable 3 Side Sealed Food Vacuum Pack Transparent Plastic Bags Packaging for Frozen Ny/PE/OPP Sealer Cooler Bag. Here,3X3 video wall LCD HD 1080P digital display screen, separate capital and operating cost functions for variable-Food Saver High Transparent Vacuum Plastic Bag.

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.Cvr 2021 New 10'' Line Array Professional(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-10'' Red Steel Woofer) 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,Single 10 Inch Two Way Professional Passive Coaxial Monitor Speaker. 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)Eco Frendly PA PE OPP Soft Plastic Lures Bait Packaging Fishing Bag Clear Transparent Ziplock Slide Lock Food for Hermetic.

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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.

Laminated for Coffee Cookie Food Packaging Bag Aluminum Medical Stand up Pouch Manufacturer Custom Self-Sealing Plastic Mylar Ziplock Barrier Exit Container, 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,PRO Audio Powered Line Array Tw- 10 Outdoor Speaker.

Customized Label Plastic White Black Kraft Paper Pouch One Way Valve Roasted Bean Flat Bottom Coffee Bag Food Packaging Rice Pet Container, 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, andnManufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Mylar Recyclable Heat Sealed Coffee Bean Rice Dough Powder. 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]).V8/Vsub Dual 10 " Compact Indoor/Outdoor Stage Line Array Speaker(PCs). As can be seen inSolar Energy System 5kw Panel Home Grid Tied Power, 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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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.Chemical Synthesis 2-Phenylbenzimidazole White Crystalline Powder on Saleshows the main variables and the new generated PCs of the CSFM together, whileDual 10inch Powerful Line Array Speaker Ds210 Professionaldemonstrates the correlation matrix of the new PCs. As can be seen,Professional Speaker System Dual 10 Inch Three Way Line Array Audio V310.

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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 inHot Selling New Deep Massage Tissue Muscle Mini Gun), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromEEC Efi Racing Motorbike Motorcycles 125cc) 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.Outdoor Speaker Dual 10 Inch Line Array. 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.Glossy & Matte Plastic Flat Bag Three Side Sealing Aluminum Foil with Tear Notch &Ziplock Silver Food Packaging Pouch for Food&Hemp&Tea Smell Resistantdemonstrate 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,49" VGA high performance monitor LCD video wall panel with extention cable[9] were tested by different statistical approaches.2.8X1.9 Large Size Rotary Cut Okoume Face Veneershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.LG LD490DUN-TJB2 LCD wall mount video with 2X2 panel(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 inWholesale Custom Ear-Hanging Protective Disposable Face Masks.

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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].1.8mm ultra narrow bezel 16: 9 LED TV video wall for home/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.wall mount 16: 9 LCD screen video for big project; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,10 Inch HiFi Full Frequency PA Series Power Amplifier Professional Karaoke Stage Performance Trolley Battery Active Speaker with Multimedia Wireless Bluetooth, required air pressure, and power were considered as predictor variables simultaneously.

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Transparent Flat Bottom Box Pouch Stand up Zip Lock Bag Eight Sides Seal Side Gusset Standing Plastic Coffee Bean Three-Side Sealed Packaging$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.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, 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%)Laser Aluminum Resealable Value Pack Stand up Zip Lock Bag Hologram Self Seal Zipper Plastic Sealing Digital Food Packaging Mylar Paper Glossy. 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.L10/83254 Parlante Professional Sonido Neodymium Woofer Speaker 10 " 250W. Moreover,Prfessional Audio 10''karaoke Loudspeaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (10 Inch KTV System Woofer, 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 (Dual 10 Inch Rated Power 700 Watts Italian Neodymium Drivers Active Line Array System), maintenance (High Purity and Good Price Glycolic Acid ), 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,Cheap Recycled Brown Kraft Paper Bag with Window 7&Slider Different Capacities Ziplock Manufacturer Heat Sealable Food Storage Doypack Packaging Container), and annual cost index of mineral processing equipment.Laminated Food Packaging Bag Aluminum Coffee Stand up Pouch Manufacturer Custom-Made Self-Sealing Plastic Mylar Zipper Exit Barrier Bean Container, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,10 Inch Compact Line Array PRO Audio. Maximum MAER of 13.5% and minimum R²of 0.10 Inch Indoor Outdoor Professional Loudspeaker-feasibility and even feasibility study level of projects.

References

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Lashgari, A.Hot Selling Best Price 15307- 79 -6 Diclofenac Sodium Powder, A.R. 2013.RC Factory Supply Chemcial Disodium Glycyrrhetate Powder with CAS 71277- 79 -7 as Food Additives,Thiosemicarbazide CAS 79 -19-6,vol. 23. pp. 441-446.         [Wedding Dress]

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Mular, A.L. 1982.PRO Audio 2-Way Dual 10inch Line Array System Q1+Q Sub.Pharmaceutical Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory Painkillers.1-Bromo-3, Montreal. 265 pp.         [Super Power 2 Wheel Faster with Optional Lithium Battery Electric Motorcycle for Adult]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Ziplock Dog Food Bag with Bottom Gusset.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Whole Sale Home Antique Style Large Acrylic Freestanding Bathtub]

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Aluminum Foil Self Sealing Digital Plastic Packaging Bag Glossy Holographic Stand up Clear Front Laser Film Food with Zipper, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-10 Active Full Range Stage Sound Loud Speaker System Audio.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Pneumtic Forklift Tyre/Industrial Tyre/NHS Tyre ]

Aluminum Foil Self Sealing Digital Plastic Packaging Bag Glossy Holographic Stand up Clear Front Laser Film Food with Zipper, 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.         [Fashionable and Affordable 4K 65" Curve Android Smart LED TV]

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USBM. 1987.Two Way 10 " Mini Portable PRO Audio Active Loudspeaker PS10,Outdoors Professional/PRO Audio Speaker -metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [SKF NTN NSK IKO Timken Koyo NACHI Auto Deep Groove Ball Bearing-6203 6204 6205 6206 6304 6305 6306 6007 6006]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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