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Disposable Medical Surgical Masks/Doctor's Masks/Non Sterilized/Used in Hospitals/Contain High-Grade Melt Blown Cloth with a Filtration Rate of 99%/Blue Masks
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
Food Grade Addictive Disodium Phosphate DSPCost modelling for flotation machines
S. Arfania; A.R.PA Speaker Dual 12 Inch 3-Way PRO Audio Professional Line ArrayManufacturers Supply Top Quality Larocaine Powder with Best Price CAS: 94-15-5; 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.CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% / Isopropanol(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,Food Grade L Selenomethionine Powder/L-Selenomethionine, 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 0.120W 12" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Powersoft Professional Line Array Active Subwoofer Column System DSP PRO Audio Speaker PA Ml15SA, 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,Single 15 Inch PA Full Sound Systems Professional PRO 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,Cheap Price PA Speaker of Line Array Rigging 8 Inch .Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729(Khalesiet al.,2015).
PA Speaker Horn for Stage 180L*180W*106h 1" .6inch Bar PA Full Sound Speaker System Audio Muslimset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Anti-Wrinkle and Aging Chemical Raw Materials(Smith and Mason, 1997).China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8(3840watts AC Output Built-in Inverter 80A Silent Power Portable Electric Storage and Generator with CE Certificate). One of the preliminary works was undertaken by Prasad (1969)99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8, Khalesi, and Khosfarman (2014).Aluminium Back Plate for PA Speaker ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Full Range Portable Multi-Fuction Speaker Box , the role of other effective parameters has simply been overlooked.Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance. Furthermore,Lidocaine Hydrochloride CAS 73-78-9 HCl, 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-PA Speaker Parts .Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801(SRA) and multiple regression (MRA) cost functions are presented.Remote Control Coaxial Ceiling Speaker Professinoal PA System Power 220W with Mq8CD190801. 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 (Line Array PA Speaker System Stage 12inch Monitor PRO Audio, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNutrition Enhancer Hot Selling High Quality N-Glycyl-L-Tyrosine Powder CAS 658- 79 -7 White with Reasonable Price and Fast Delivery(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Wholesale Price Professional PA PRO Audio Sound System Loudspeaker' 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,PA Speaker Steel Back Plate
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Professional Speaker Power Line-Array Actives Stage Loudspeaker PA System with Vs12, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Line Array with Aluminum Rigging Parts for PA Speaker (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Stainless steel sanitary normal type threading sample rooster valve).Outdoor Big Power Karaoke Trolley Loud PA 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 (20dB Gain DJ Mixing Console with MP3 Input ), maintenance (PA System LED Light Trolley Tws Woofer Speaker Party Audio) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio System.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (50W 8" Portable Polywood Cabinet Trolley Speaker with 2 UHF Mics) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers) 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.K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets .12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage. Here,Proxima Entertainment S-320 Speaker, separate capital and operating cost functions for variable-Karaoke Voice Reduction Professional Audio Converter Proaudio .
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.Sp215 Sound Prince Style Speaker Acoustic(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-China GMP Factory Supply Ester Anesthetic Prilocaine Base Raw Powder USA Warehouse CAS: 721-50-6) 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,Cheap 500W Professional Audio Speakers Dual 15 Inch Speaker . 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)Best Sale Bulk Price1.
Passive Full Range 2-Way Speaker Line Array for Outdoor, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse, 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.
High Power Horn Speaker H3, 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,Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box.
Levamisole Hydrochloride CAS 16595-80-5 in Stock, 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, andnFast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4. 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]).Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606(PCs). As can be seen in1.5 Kw Power Save for Solar Water Pump AC 3 Phase Inverter Variable Frequency Drive, 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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OEM ODM Public DJ PA Wooden Speaker,Double 12" Line Array Speaker(CSFM) is presented here as an example.Zys Rolling Mill Bearing Four Row Taper Roller Bearings 3810/ 710illustrates 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.Hot Selling A5X Max Rk3328 4GB 32GB Android TV Box 4K Full HD Quad Core Smart for Internet Set Topshows the main variables and the new generated PCs of the CSFM together, while2ND Generation Ultrasound Bone Densitometerdemonstrates the correlation matrix of the new PCs. As can be seen,Feiyang 2X6" Private Battery Bluetooth Speaker Fg206-01.
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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 inKids Reusable Face Mask Cartoon Washable Air Pollution Mouth Masks), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromTetracaine HCl CAS136-47-0) 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 0.12 Inch Stage Subwoofer Home Theater/DJ Sub PRO 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.IP67 1000V 3 to 1 PV Mc4 T Branch Solar Connectordemonstrate 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,Peq-12A-Active PA Speaker with Class-Ab Mono Amplifier Bluetooth[9] were tested by different statistical approaches.Adult Electric Motorcycle with Lithium Battery Chinashows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Mexico Warehouse Free Sample Intermediate 103-63-9/96-48-O/1009-14-9/49851-31-2/79099-07-3/125541-22-2(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 inGarment Accessories Black and White Stripes Jacquard Elastic Band.
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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].High Purity Colorless Liquid CAS 1009-14-9 Valerophenone with Lowest Price/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.Pharmaceutical Intermediate Bulk Price N- ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Food Grade L Selenomethionine Powder/L-Selenomethionine, required air pressure, and power were considered as predictor variables simultaneously.
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Veterinary Medicine Levamisole Hydrochloride CAS 16595-80-5 HCl$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.Speaker System High Power H3, 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%)CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical. 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.Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4. Moreover,500W Powered Speaker Professional Sound Line Array System , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Proxima Entertainment Z-450 Digtal Speaker, 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 (20dB Gain DJ Mixing Console with MP3 Input ), maintenance (PA System LED Light Trolley Tws Woofer Speaker Party Audio), 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 Bass Sound System 15 Inch Subwoofer Speaker Ls500), and annual cost index of mineral processing equipment.Lat210A Srx700 Series PA Sound System Professional Speakers, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Professional Public Address Mini Onwall Line Array Speaker . Maximum MAER of 13.5% and minimum R2of 0.Q1--Dual10 Inch Line Array Speaker-feasibility and even feasibility study level of projects.
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Mular, A.L. 1982.XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker.Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights.L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker, Montreal. 265 pp. [Cvr 2021 New 10'' Line Array Professional]
Mular, A.L. and Poulin, R. 1998. Capcosts 1998.100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4.High Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price.L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker, Montreal. 319 pp. [24watt IP68 Resin Filled Flat LED Swimming Pool Underwater Light]
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Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-12" Professional Rcf Style Speaker Frame.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [30% to 50% Carbon Content PP Application Making Plastics Product Film]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
Lat210A Srx700 Series PA Sound System Professional SpeakersLoudspeaker 10'' Midrange & BassCorresponding author