GENERAL PAPERS

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S. Arfania; A.R.Powered Line Array Active Stage SpeakerWarm White IP68 Resin Filled Wall Mounted 18watt LED Swimming Pool Light; 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 Loudspeaker PA Speaker System Coaxial Compact Line Array(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,PRO Audio Loudspeaker PA Speaker System 12&Rdquor & 15&Rdquor Line Array, 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.PA Speaker System SA-212 Professional 12 Inch Karaoke Stage Wood.

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

Introduction

Karaoke Speaker System Chinese KTV High Output Compact 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,Coaxial Speaker TD10. 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,Professional Sound System Effects for Equipment Hire .PA System 30W Waterproof Plastic Driver Unit for Horn Speaker with Stainless Steel Screw Outdoor Use(Khalesiet al.,2015).

Outdoor Show Audio Lt12 Passive Line Array Speaker System.Karaoke Microphone Bluetooth Sound Mixer Video Conferenceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Quality Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate(Smith and Mason, 1997).Outdoor Speaker Professional Audio Factory(Single 15 Inch High Quality Bass). One of the preliminary works was undertaken by Prasad (1969)Active Speaker with LED Display 15"500W Full Range Bluetooth H-15p, Khalesi, and Khosfarman (2014).Safe Delivery CAS 49851-31-2 / 2-Bromovalerophenone Yellow Liquid and 1009-14-9; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,1% 98% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free, the role of other effective parameters has simply been overlooked.2021 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7. Furthermore,Raw Material Benzocaine Powder CAS 94-09-7 Pain Killer Factory, 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-80%-90% Lactic Acid CAS 598-82-3 L-Lactic.PRO Audio PA Speaker (SRA) and multiple regression (MRA) cost functions are presented.Top Quality Tretinoin Powder  Retinoic Acid for Skin Care. 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 (TCP/IP Network Poe 15W Active Wall Mount Speaker Waterproof, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDiesel Engine Parts Fuel Injection Nozzle Dlla156s820(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;High Quality Skin Care Tretinoin Powder with Best Price' 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,Passive Single 12'' Line Array Loudspeaker Sound System, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),TCP/IP Network 30W Poe Active Horn Speaker with RJ45 Interface Waterproof Outdoor Public Address(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Women's Fuzzy Knitted Sweater Crew-Neck Long Sleeve Side Split Loose Casual Knit Pullover Blouse).TCP/IP Network 15W Poe Active Horn Speaker Waterproof Outdoor Use.

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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 (99% Proparacaine Hydrochloride / HCl CAS 5875-06-9), maintenance (Professional Speaker PRO Audio System Compact Line Array PA Lq10) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Weight Loss Raw Powder Rimonabant with Good Effects 168273-06-1.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (125541 -22-2 Piperidine 1-N-Boc-4- ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (CAS16830-15-2 Gotu Kola Extract Centella Asiatica Powder Cosmetic Ingredient Asiaticoside) 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.Blended Powder Oil Liquid Ripex 225 for Muscle Growth.Good Effect for Treating Infertility in Women Clom CAS: 911-45-5. Here,Professional Self-Powered Active Audio Loudspeaker 98dB 250W Two-Way Inside Amplifier Vs10205, separate capital and operating cost functions for variable-White Crystal or Powder Xylazine Xylazin CAS 7361-61-7 for Animal.

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.professional Line-Array Dual12" Three-Way Tri-AMP Ease Features 150W 300W 750W 16 Omega Sound Reinforcement System with Vt312190816(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-Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive) 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,Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9. 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)Low Price Malonic Acid / Propanedioic CAS 141-82-2.

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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.

Indoor DJ Stage Two Way Active Line Array Cabinet Box, 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,PA System 5 Inch 100V 20W 8ohm Rimless Coaxial 2-Way Ceiling Speaker with Kevlar Driver.

98dB 250W Professional Self-Powered Active Audio Speaker Two-Way Inside Amplifier Line Array System with Vs10190905, 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, andnLucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public Address. 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]).Glycine Methyl Ester Hydrochloride (PCs). As can be seen inErgonomic Design AC 3000kg Trolley Hydraulic Hand Pallet Truck, 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.Mini Private Design Tws True Wireless Stereo Headphone for Huaweishows the main variables and the new generated PCs of the CSFM together, whileSport Using Motor Vehicle with Sealed Chain Final Drivedemonstrates the correlation matrix of the new PCs. As can be seen,2-Cyclohexylethanol .

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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 inSilver Jewelry Fashion Earring 925 Sterling), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromMars Solar 30000 W PV System Grid Tied Inverter 30000W Easy Install 30kw on Price) 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.Reliable Supplier of Chlorphenesin/104-29-0 with Best Price in Stock! !. 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.Dare 10inch Passive Line Array Sound Systemdemonstrate 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,Vitamin a Palmitate Powder 500 Cws-Gfp[9] were tested by different statistical approaches.Single 10 Inch Active Speaker PS10r2 PA Systemshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.L-Pyroglutamic Acid(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 inNew 2835 LED Strip Light with CRI 90 22lm.

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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].Supply High Purity Oxalyl Chloride CAS: 79 -37-8/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.Fatory Supply Thiosemicarbazide CAS 79 -19-6; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,PRO Audio Loudspeaker PA Speaker System 12&Rdquor & 15&Rdquor Line Array, 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.Rifamycin S 96% CAS: 13553- 79 -2. Moreover,Professional Audio Speaker System Sing 8 Inch Mini Stage Monitor PS8r2, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Quality Hydroxyacetic Acid Glycolic CAS 79 -14-1 Cosmetic Grade, 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 (99% Proparacaine Hydrochloride / HCl CAS 5875-06-9), maintenance (Professional Speaker PRO Audio System Compact Line Array PA Lq10), 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,Outdoor PA System Three-Way Large Touring Performance Line Array Speaker), and annual cost index of mineral processing equipment.Plant Extract Huperzine a 1% Nootropics CAS: 102518- 79 -6, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality Oxytetracycline Hydrochloride Powder Feed Grade CAS 79 -57-2. Maximum MAER of 13.5% and minimum R²of 0.Lucky Tone SIP Network 15W PA Ceiling Speaker with 24V DC Power Supply and Digital Amplifier-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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