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Cosmetic Grade L-Arginine with High QualityCost modelling for flotation machines

S. Arfania; A.R.PA Column Speaker Empty Alu. Cabinet 4.5" 5L Rectangle Metal Aluminium Chemical Paint Oil Easy Open Tin Can; 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.PRO Audio Speaker 12 Inch Sub PA Passive Speakers(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,PA Speaker Steel Back Plate , 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.Professional Speaker Power Line-Array Actives Stage Loudspeaker PA System with Vs12.

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

Introduction

Line Array with Aluminum Rigging Parts for PA Speaker , 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,Outdoor Big Power Karaoke Trolley Loud PA Speaker. 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,20dB Gain DJ Mixing Console with MP3 Input .PA System LED Light Trolley Tws Woofer Speaker Party Audio(Khalesiet al.,2015).

Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System.50W 8" Portable Polywood Cabinet Trolley Speaker with 2 UHF Micset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Photovoltatic 1000V Solar Distribution Box PV Array 24 String DC Combiner AC Switching(Smith and Mason, 1997).High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers(Win10 TV Box Pipo X9s Z8350 Chipset 4G 64G Media Player Win Smart Digital Receiver). One of the preliminary works was undertaken by Prasad (1969)K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets , Khalesi, and Khosfarman (2014).12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Proxima Entertainment S-320 Speaker, the role of other effective parameters has simply been overlooked.Karaoke Voice Reduction Professional Audio Converter Proaudio . Furthermore,Sp215 Sound Prince Style Speaker Acoustic, 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-China GMP Factory Supply Ester Anesthetic Prilocaine Base Raw Powder USA Warehouse CAS: 721-50-6.Cheap 500W Professional Audio Speakers Dual 15 Inch Speaker (SRA) and multiple regression (MRA) cost functions are presented.Best Sale Bulk Price1. 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 (Passive Full Range 2-Way Speaker Line Array for Outdoor, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inJwell HDPE Waterproof Membrance Roll Extrusion Line(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse' names:

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►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,2.4GHz Wireless Ceiling Speaker PA System, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),OEM ODM Public DJ PA Wooden Speaker(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Neon Pigment 17 Pink).Double 12" Line Array Speaker.

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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 (Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01), maintenance (PA Speaker with Single-Point Angles Regulator ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,12 Inch Stage Subwoofer Home Theater/DJ Sub PRO Audio.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Peq-12A-Active PA Speaker with Class-Ab Mono Amplifier Bluetooth) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2) 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.CAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%.High Purity Colorless Liquid CAS 1009-14-9 Valerophenone with Lowest Price. Here,Pharmaceutical Intermediate Bulk Price N- , separate capital and operating cost functions for variable-Cinnamaldehyde CAS 104-55-2 Cinnamic Aldehyde Factory Supply.

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.Einecs No. 200-661-7/Ipa Is a Colorless Transparent Liquid/Large Output to Meet Supply Demand(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-Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl) 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,Speaker System High Power H3. 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)CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical.

Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (500W Powered Speaker Professional Sound Line Array System , 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.

Proxima Entertainment Z-450 Digtal Speaker, 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,Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500.

Lat210A Srx700 Series PA Sound System Professional Speakers, 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, andnProfessional Public Address Mini Onwall Line Array Speaker . 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]).Q1--Dual10 Inch Line Array Speaker(PCs). As can be seen inPendoo X10 Max Amlogic S905X3 Android TV Player World IPTV Video Box Support IR /2.4GHz Wireless Mobile Remote Control, 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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Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth,Portable Black Floor Tripod Speaker Stand Adjustable for 12 Inch PA(CSFM) is presented here as an example.Speaker PS10illustrates 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.Fast Delivery 2 Wheel Lithium Battery Electric Bike Lady Bicycle Motorcycle in Stockshows the main variables and the new generated PCs of the CSFM together, whileGy6 Engine 150cc Gasoline Scooter for Adultsdemonstrates the correlation matrix of the new PCs. As can be seen,Power Amplifiers PA Speaker System Amplifier 1000 Watt.

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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 in2021 Hot Sales 65W GaN Charger with PPS Technology), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromProfessional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer) 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.Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell. 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.Adult Foldable Fold Road Bike MTB Mountain Bicycle Sdc -902demonstrate 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,Live/Installed Sound System PRO Speaker Box [9] were tested by different statistical approaches.Vera 12 Loudspeaker Line Array Speaker Systemshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Outdoor Double 6" Full Range Speakers 12" Active Subwoofer Professional Audiomini Live Bands System for Musician PA(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 inAutomatic Liquid Ffs Packaging Machine Dxdy-40II/150II.

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Cost model for variable-Professional Speaker with Laser Light

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].XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker/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.Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,PA Speaker Steel Back Plate , required air pressure, and power were considered as predictor variables simultaneously.

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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.Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4. Moreover,18" Fane Style Aluminum Speaker Frame, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (18" Die Cast P-Auido Style Aluminum Frame, 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 (Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01), maintenance (PA Speaker with Single-Point Angles Regulator ), 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 Stage Active Line Array Speaker with DSP), and annual cost index of mineral processing equipment.Single 18" Subwoofer Speaker Box, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse. Maximum MAER of 13.5% and minimum R²of 0.12" Professional Rcf Style Speaker Frame-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Manufacturer Supply Bdo Novel Intermediate 1.Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro.Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speaker, Montreal. 319 pp.         [Aftermarket Hdy. Cyl Repair Kits for Cat Diggers/0965606]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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