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S. Arfania; A.R.Wholesale Peptides Safe Shipping Anti-Aging Mass Building Supplements HMGLCD Digital Signage 21.5 Inch Automatic Induction Hand Sanitizer Billboards; 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.P-Toluenesulfinic Acid Sodium Salt Hydrate (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,Bloom Tech Chemical Reagent Bis , 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.Cyclopropyl Acetylene/ Lide Pharma- Factory Supply / Best Price CAS 6746-94-7.

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

Introduction

CAS: 13463-67-7 Titanium Dioxide Powder, 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,Nutrition Food Grade Dl-Pyroglutamic Acid Pure L-Pyroglutamic. 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,Factory Supply 99% Dexketoprofen Trometamol Powder.10W Wall Mount Speaker with Transformer 8 Ohm 100V Bluetooth (Khalesiet al.,2015).

Karaoke Wireless Portable Bluetooth PA Trolley Speaker Box.Feiyang New Hot Selling Trolley Speaker Fg210-06et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Jwell - High Performance Shoes PEVA Hotmelt TPU Film Production Line(Smith and Mason, 1997).V-Sub 18" PA Audio Cardioid Subwoofer Speaker for Home Theater(46''55''65''75'' High Quality Double Sided LCD Touch Screen Monitor Bus Shelter Advertising Media Player). One of the preliminary works was undertaken by Prasad (1969)PRO Audio PA System Digital Mixer, Khalesi, and Khosfarman (2014).Food Grade L-Arginine with Best Price; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,J8 Dual 12'' Line Array PA Speaker Professional Stage Audio System, the role of other effective parameters has simply been overlooked.10 " 12"15"18" PA Speakers Loudspeaker Cabinet/Enclosure. Furthermore,Wild Bee Venom Extract Melittin 99% Powder for Skin Care, 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-Supply High Quality Glycolic Acid Powder for Skin Whiting CAS 79 -14-1.Retinoic Acid CAS 302- 79 -4 in Stock(SRA) and multiple regression (MRA) cost functions are presented.Plastic Clear White Stand-up Drinking Liquid Spout Food Packaging Bag. 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 (ISO Certified 100% Natural L-Arginine Powder, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inO2 Oxygen Sensor for Honda Accord 2.3L 4 Cyl F23A4 2000-2002 234-9014(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;High Quality Cosmetic Grade Hydroxyacetic Acid Glycolic CAS 79 -14-1' 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,10 Inch Powered Line Array Speaker Active

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Hot Sale Model V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Dual 10 Inch Line Aray Powered Active Sound System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (CC warm white strip 2835 PU glue flexible Lighting LED).60W 10 " Portable HP5 Series Trolley Speaker with 2 UHF Mics.

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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 (Manufacturer Supply 1), maintenance (Dual 10inch PA Audio Line Array Speaker Box System) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dual 10 " 600W Line Array PA Professional Speaker .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (10 " Dia Cast Aluminum Professional Subwoofer Basket) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Food Packaging Vacuum Pouch) 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.Good Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Delivery.L-Arginine 99%. Here,China Factory Price CAS 702- 79 -4 1, separate capital and operating cost functions for variable-CPP High Temperature Vacuum Retort Pouch.

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.Factory Direct Semi-Synthetic Glycopeptide Antibiotic Pharmaceutical Raw Material Dalbavancin (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 Temperature 3 Side Seal Retort Pouch for Corn) 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,R-3-Amino-1-N-Boc-Piperidine. 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)ISO Certified 100% Natural L-Arginine Powder.

Mylar Barrier Exit Waterproof Cr Bag, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Stand-up Ziplock Dried Food Packaging Vacuum Plastic Container, 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 Quality Laminated Food Grade Roll Film, 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,D&B Style Dual 10 Inch Compact Line Array .

Safety Shape Bag /Food Packaging Contact Plastic Container for Resealable, 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, andnCustom Plastic Coffee Flat Bottom Food Packaging with Ziplock Container. 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]).Family Usage Embossed Vacuum Bags for Food(PCs). As can be seen inSolar Battery Solutions 3kwh Lithium LiFePO4 Hybrid System, 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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Snsck Food Bag Fried Flat Bottom Box Pouch with Zipper,Dual 10 " Compact Speaker Line Array (CSFM) is presented here as an example.High Quanlity 1 Phase 3 AC Drive VFD for Pumpillustrates 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.0.18mm Zebra Wooden Veneershows the main variables and the new generated PCs of the CSFM together, whileProxima Entertainment Z-450 Digtal Speakerdemonstrates the correlation matrix of the new PCs. As can be seen,10 " Woofer with 3" Voice Coil.

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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 inLakesea Brand 33X12.5r17lt 4X4 Tyres off Road Mud Mt Extreme Performance 4WD Open Country), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromWhite Ammonium Sulphate NPK Fertilizer) 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.Dual 10 Inch Line Array Speaker for Theater . 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.Body Circumference Reduction RF Vacuum Fast Slimming System Beauty Apparatusdemonstrate 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,Lf Driver 10 Inches 64mm Glass Fiber Coil Professional Speaker [9] were tested by different statistical approaches.Yn725 Yineng Mini Wheel Loader 18.5kw Cabinshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Dual 10 Inch Line Array for Church (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 inFashion 20"22" 24" 28" Hardside ABS PC Travel Trolley Luggage.

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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].10'' Inch Ferrite Woofer/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.V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Bloom Tech Chemical Reagent Bis , required air pressure, and power were considered as predictor variables simultaneously.

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New Tw Audio Vera36 Dual 10 " Line Array Speaker System$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.Professional Line Array Vtx V20 Dual 10 Inch Three Way Speaker, 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%)Dual 10 " Compact Professional Line Array . 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.Custom Kraft Paper Flexible Food Packaging Flat Bottom Bag-100gr. Moreover,Custom Water Proof Child Resistant Food Grade Plastic Aluminum Laminated Stand up Container Bag, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Hot Sale Vacuum Bag Nylon Material for Agricultural Products, 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 (Manufacturer Supply 1), maintenance (Dual 10inch PA Audio Line Array Speaker Box System), 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,Buy 99% Retinoic Acid Powder Vitamin a Tretinoin Retinol for Cosmetic), and annual cost index of mineral processing equipment.Bio-Degradable Brown Kraft Food Packaging Bag, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Child Resistant Waterproof Plastic Bag with Zipper. Maximum MAER of 13.5% and minimum R²of 0.Kraft Paper LDPE Supermarket Vegetable Cosmetic Fruit Packaging Bag-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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