GENERAL PAPERS

Perkins Genuine Cyl Cylinder Head Cover Assy 4142X402 for Industrial Diesel EnginesCost modelling for flotation machines

S. Arfania; A.R.Ts218 Dual 18" Speakers Subwoofer Speaker BoxChina Qingzhou Titan Zl08f 0.8ton Mini Small Garden Tractor Front End Wheel Loader; 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.Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s(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,Two-Way Full Range 1000W Professional Power Speaker, 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.CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical.

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

Introduction

Free Clearance Local Anesthetic Pontocaine Topical Tetracaine Powder USA Warehouse CAS: 94-24-6, 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,China Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149. 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,Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouse.CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical(Khalesiet al.,2015).

Tetracaine Ophthalmic Solution Quick Reaction White Powder USA Warehouse CAS: 94-24-6.Single 5"Two-Way Full-Range Loudspeaker Small Scale Indoor with Tx5cet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for New Racing Motorcycle(Smith and Mason, 1997).High Qualty Line Array Loudspeaker(CAS No.: 63428-84-2 Polyamide Resin). One of the preliminary works was undertaken by Prasad (1969)DSP Active Line Array Speaker, Khalesi, and Khosfarman (2014).Neodymium 12inch 932lap Professional Powered DSP Line Array Speaker; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,8in 8out Professional DSP Matrix Digital Audio Processors with Dp-0808date20, the role of other effective parameters has simply been overlooked.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1220. Furthermore,New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx820, 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-Recording Studio Equipment Vera Series Super Power Speaker Box.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx620(SRA) and multiple regression (MRA) cost functions are presented.Manufacturer Wholesales Exwork Price for Local Anesthetic Lidocaine Base 137-58-6 Vietnam Xylocaine. 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 (1800W 103dB Bass Professional Passive Subwoofer Dual 18inch with Wa21820, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHot Sale 10kw 10000W off Grid Solar Power System Home Use(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Line Array Horn of Professional Audio 170L*160W*140h 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,Waterproof Loudspeaker Wall Mounter 15inch Mq-15cp

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Vera12 New Design 800watts 12" Audio System Line Array, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Single 15 Inch High Quality Bass(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Elegant Ladies Casual Handbag).Professional Audio Speaker Column Sound Equipment.

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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 (Professional Passive Subwoofer Dual 18inch 1800W 103dB Bass with Wa21820), maintenance (Srx715 Sing 15" Professional Speaker) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Aclon DSP3500 Professional DJ Sound Speakers DSP Powered Line Array.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Small Column White Color Church Conference Room Speaker) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Arc Shaped Column Speaker for Restaurant and Shopping Mall) 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.Peq-18SD1 18'' Bass Reflex Active Powerful Subwoofer.Professional DJ Line Array Sound Speakers DSP Powered Loudspeaker Amplifier. Here,Theater Professional Line Array Speaker, separate capital and operating cost functions for variable-15' Water-Proof Installation Long-Throw Speaker with 100V Transformer.

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.Guangzhou Skytone Vera S18 18'' New Design Line Array Subwoofer(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-Double 6inch Powered Line Array Speaker) 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,Factory Export 99% Purity Chlorhexidine CAS55-56-1 with Lowest Price. 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)Free Clearance Surface Anesthesia of Eyes.

Free Clearance USP40 Tetracaine Base Skin Surface Anesthesia Pain Reliever Cream CAS: 94-24-6, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High Purity 9-Hydroxyfluorene CAS 1689-64-1 with Good Price in Stock, 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.

CAS No.: 67-63-0 Isopropyl Alcohol 99.9%/Ipa 99.9%/Isopropanol 99.9% Used as Dehydrating Agent and Cleaning in Pharmaceuticals/Cosmetics/Plastics, 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,Vrx932 Horn Line Array Professional Manufacturer.

Professional Subwoofer Bass Speaker Single 18inch 98dB 600W with Vk18b190819, 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, andnSrx715 Single 15" Speaker Cabinet PRO Audio System. 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]).Vera 12 Loudspeaker Line Array Speaker System(PCs). As can be seen inEmpty Gal Metal Round Tin Can 118ml 4oz Bundi PVC Pipe Glue Bottle with Brush, 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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Single 15" Plastic Powered Speaker,Veterinary Grade Petcare Products Anesthesia Cream Topical Lidocaine Spray137-58-6 UK Warehouse(CSFM) is presented here as an example.Top Grade Cross-Country Motorcycle Tire 120/90-18illustrates 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.Sunpal 150kw Solar Grid Tied System Low Priceshows the main variables and the new generated PCs of the CSFM together, whileIP65 Waterproof High Lumen Outdoor Flood Light for Tennis Court/ Soccer Field/ Stadium 400W 600W 800Wdemonstrates the correlation matrix of the new PCs. As can be seen,Double 6" Professional Speaker Line Array.

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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 inHigh Precision Metal Bench Hobby Lathe), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromOEM/ODM T95 Allwinner H616 Android 10.0 6K 4GB 32GB Box 4K Remote Control Smart TV) 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.Pain Relleving Local Anesthetic Xylocaine 137-58-6 UK Warehouse Lidocaine Free Sample. 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.Supply High Quality Glycolic Acid Powder for Skin Whiting CAS 79 -14-1demonstrate results for the machines modelled in this research.

Multiple regression results

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Cost model for variable-Professional Loudspeaker Single 5" Coaxial Full Range Speaker with CF5

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].Vrx932la Compact Line Array Speaker System/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.Vrx932la Dual Voice Coil Line Array Speaker Box; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Two-Way Full Range 1000W Professional Power Speaker, required air pressure, and power were considered as predictor variables simultaneously.

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Portable Wireless Professional Rechargeable DJ Karaoke Sound Box Bluetooth PA Speaker with Wire Microphone 1PCS$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.Single 12" Plastic Waterproof 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%)800W VERA 12 Line Array DJ Speaker Cabinet PRO Audio. 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.Powered Concert Theater High Performance PA System Power Sub Bass. Moreover,2way Indoor Club Party Wedding Line Array 15inch Sound System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (12 Inch Audio Wireless Professional Portable Rechargeable DJ Bluetooth PA Trolley Speaker with LED Light ED-1201 Wire Microphone 1PCS, 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 (Professional Passive Subwoofer Dual 18inch 1800W 103dB Bass with Wa21820), maintenance (Srx715 Sing 15" Professional Speaker), 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 Active Powered Line Array Speaker Mini 5 Inch Audio), and annual cost index of mineral processing equipment.Professional Dual 15" Multi-Purpose Speaker, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Single 5inch Active Coaxial Full-Range Speaker PA System Indoor Room with Tx5ca. Maximum MAER of 13.5% and minimum R²of 0.New Driver Beyma Professional Speaker Line Array PA System Single 18" Sub Bass Subwoofer with Wa218PRO-feasibility and even feasibility study level of projects.

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Mule Deer Tranquilizer First Choice Tiletamine HCl Injection Free Sample 14176-50-2.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Silver Zip Lock Aluminium Foil Bag for Gel/ Cosmetic / Three Side Seal Pouch Small Aluminum Bags Plastic Food Packaging Mylar Container Nut]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Bloom Tech Chemical Reagent Self-Powered Active Bass Speaker Professional Subwoofer Single 18inch PA Audio System 800W Vs18s20Corresponding author