Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer

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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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On-line version ISSN2411-9717
Print version ISSN2225-6253

J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017

http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

GENERAL PAPERS

PE Pipe Extrusion Machine Line/HDPE Production Line/Plastic HDPE/LDPE /PPR Electricity Conduit Tube/ Water Sewage& Pressure Supply LineCost modelling for flotation machines

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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.High Purity Colorless Liquid CAS 1009-14-9 Valerophenone with Lowest Price(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,Pharmaceutical Intermediate Bulk Price N- , 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.Cinnamaldehyde CAS 104-55-2 Cinnamic Aldehyde Factory Supply.

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


Introduction

Einecs No. 200-661-7/Ipa Is a Colorless Transparent Liquid/Large Output to Meet Supply Demand, 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,Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl. 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,Speaker System High Power H3.CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical(Khalesiet al.,2015).

Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4.500W Powered Speaker Professional Sound Line Array System et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Professional Coaxial Ceiling Speaker Banqual Small and Medium Conference Hall with Mq8c190801(Smith and Mason, 1997).Proxima Entertainment Z-450 Digtal Speaker(Mini Kd Key Generator Remotes Warehouse in Your Phone Support Android Make More Than 1000 Auto Similar Kd900). One of the preliminary works was undertaken by Prasad (1969)Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500, Khalesi, and Khosfarman (2014).Lat210A Srx700 Series PA Sound System Professional Speakers; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Professional Public Address Mini Onwall Line Array Speaker , the role of other effective parameters has simply been overlooked.Q1--Dual10 Inch Line Array Speaker. Furthermore,12inches PA Speaker Audio Component, 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-Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth.Portable Black Floor Tripod Speaker Stand Adjustable for 12 Inch PA(SRA) and multiple regression (MRA) cost functions are presented.Power Amplifiers PA Speaker System Amplifier 1000 Watt. 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 (Wholesales Organic Intermediate 1, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in28dBi Gain 0.6m 5GHz Parabolic Antenna Best Design for Sale(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell' 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,Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency 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),100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (MDF with Melamine Top Conference Table for Meeting Room).High Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price.

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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 (Free Sample Organic Chemicals 1), maintenance (High Quality Phena) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (18" Fane Style Aluminum Speaker Frame) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (18" Die Cast P-Auido Style Aluminum Frame) 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.Professional Stage Active Line Array Speaker with DSP.Single 18" Subwoofer Speaker Box. Here,Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse, separate capital and operating cost functions for variable-12" Professional Rcf Style Speaker Frame.

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.Horn Professional Speaker H3(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-Coaxial Loudspeaker TD12) 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,18'' Subwoofer Speaker Box Ls1200. 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)Dual 12" Subwoofer Speaker Box.

DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Fast Delivery 1, Khalesi, and Khosfarman, 2014).

whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables 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.

Professional Speaker Box F12+, 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]:

whereXobsis the observed value,xethe estimated value at time/placeI,and n,Df B&C Trees Speaker Subwoofer Audio Professional.

15'' Coaxial Speaker , 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).

whereCeis the estimated cost,Cathe actual cost, andnCustoms Guaranteed 1. 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]).China Factory Supply Ethylmagnesium Bromide CAS 925-90-6(PCs). As can be seen inFree Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse, 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 andXias Equations [5] and [6]:

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In this research, main variables ofX1, X2... Xnwere 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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Manufacturer Supply Bdo Novel Intermediate 1,Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro(CSFM) is presented here as an example.High Purity Ethylamine HClillustrates 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.Jarol Frequency Inverter JAC200 3 Phase 380V 4kwshows the main variables and the new generated PCs of the CSFM together, whilePA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line Arraydemonstrates the correlation matrix of the new PCs. As can be seen,99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6.

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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)

whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inOutdoor Tactical Waist Leg Bags), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromAftermarket Hdy. Cyl Repair Kits for Cat Diggers/0965606) 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 0.400 Watt Portable Music Player Speaker Professional Audio. 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.2021 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7demonstrate 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,Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers[9] were tested by different statistical approaches.Electric Motorcycle shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Dm 15 Inch PA Full Sound Systems Professional PRO Speaker(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 in10ml 15ml 20ml 30ml 50ml 100ml Essential Oil Bottles Cosmetic Glass for.

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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].Dare Dual 8" Neodymium Active Line Array Set PA 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.12" Die Cast Aluminum PA Speaker Frame; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Pharmaceutical Intermediate Bulk Price N- , required air pressure, and power were considered as predictor variables simultaneously.

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Active Mini Line Array Speaker with DSP Amplifier Module$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.Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder, 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%)High Quality Karaoke Loudspeaker with B&C Compression Driver. 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.99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0. Moreover,Factory Supply BMK Powder Glycidate CAS: 5413-05-8, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone, 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 (Free Sample Organic Chemicals 1), maintenance (High Quality Phena), 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,Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder), and annual cost index of mineral processing equipment.99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price. Maximum MAER of 13.5% and minimum R2of 0.Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5-feasibility and even feasibility study level of projects.

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Khalesi, M. R., Zarei, M. J.,CAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-62442 Shiny and Non Phena Powder 62 44 2.Minerals Engineering,vol. 81. pp. 103-108.         [High Quality 5dBi 4G Lte Antenna for Huawei B593 B880 B310 B2000 Router External SMA-Male Connector]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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