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Factory Directly Amlogic S905W Quad Core HD 4K Android 7.1 T95 S2 Wireless TV Box T95s2
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
Professional Audio Kara Line ArrayCost modelling for flotation machines
S. Arfania; A.R.Levamisole Hydrochloride/ HCl Powder CAS 16595-80-5portable Fiber Laser Marker Machine for Eyeglasses Case Accessories; 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.Pain Relleving Patch Topical Lidocaine Spray137-58-6 UK Warehouse Free Sample(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,Kas DJ Speaker Dual Line Array 18 Inch Subwoofer, 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.Mini Speaker Line Array Wedding Decoraions DJ Mixer.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
8 Ohm PRO Audio DJ Mixer Live Sound System, 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,Professional Stage Line Array System Dual 15'' Self-Powered 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,High Purity Valerophenone 1-Phenylpentan-1-One CAS 1009-14-9.Topiramate(Khalesiet al.,2015).
99% High Purity Bupivacaine Anesthetic Powder Factory Price CAS: 14252-80-3.Pain Killer 99% Purity Bupivacaine Hydrochloride/Bupivacaine HCl CAS 14252-80-3et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 150cc Automatic Racing Sports Exclusive Design ATV (Smith and Mason, 1997).Levamisole HCl / Hydrochloride Anthelmintic Agent Raw CAS 16595-80-5(Shower Enclosure/ Cabin/ Glass Sliding Door for Bathroom: Quadrant Enclosure AS3912T-90). One of the preliminary works was undertaken by Prasad (1969)Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Price, Khalesi, and Khosfarman (2014).Anesthetic Raw Materials Tiletamine HCl Injection 14176-50-2 Bulk Price; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Quality Nootropics Noopept CAS 157115-85-0 Best Price, the role of other effective parameters has simply been overlooked.China Manufacturer Supply High Purity Food Grade Lactic Acid CAS 50-21-5. Furthermore,2021 Hot-Sale Lt12 Dual 12" Concert Line Array System, 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-Line Array of Parts for PRO Audio Speaker.Effects Night Club Bluetooth Powered Speaker Pofessional PA Line Array(SRA) and multiple regression (MRA) cost functions are presented.High Reliability DSP Active Professional Line Array Speaker . 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 (Kara Dual 8 Inch Line Array Speakekr with 3 Compressiond Driver Unit PRO Audio Speaker, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inBMK New Arrival High Quality Glycidic Acid CAS 16648-44-5(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Professional Audio Line Array Speaker Neodymium Crossover System' 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,Tp01 Piezo Electric Dome Tweeter
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Line Array of Parts for PRO Audio Speaker , 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 Accessories for PRO Audio (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Acrylic Nail Polish Display Stand Customized Bottle Holder).Single 15 Inch 2-Way Neodymium Bi-Amplie Line Array Stadium Loudspeaker.
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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 (Bulk Supply Veterinary Tranquilizer Tiletamine Xylazine Powder 14176-50-2), maintenance (Tg01 1 Inch Silk Dome Tweeter) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Professional Speaker Compective PRO Audio .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Double 12inch Active Coaxial 29kg Line Array Speaker System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Free Shipping 99% Tranquilizer Powder Tiletamine HCl 14176-50-2 NMDA Receptor) 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.Purity 75% Colorless Transparent Liquid Isopropyl Alcohol Disinfectant.Levamisole HCl Anthelmintic Agent Hydrochloride Raw CAS 16595-80-5. Here,Safe Delivery Anesthesia Injection Tiletamine Xylazine Pure Powder 14176-50-2, separate capital and operating cost functions for variable-High Quality Chemical Pharmaceutical Intermediate Xylazine Hydrochloride CAS 23076-35-9.
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.2-Carboxybenzaldehyde/Phthalaldehydic Acid CAS 119-67-5(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-Professional Loudspeaker Line Array PRO Audio) 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,Live Music Sound Line Array System for Acoustic and Electronic Performance. 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)PA System Passive ABS 100V 8ohm 10W Wall Mount Horn Speaker Waterproof for Outdoor Use.
900watt Amplifier Moudel Borad Chinese Class -D, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Mercado Brasil 99.85% Lidocaina HCl Sem Problemas Aduaneiros, 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.
100% Passing Customs Local Anesthetic Drugs Procaine for Pain Release, 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,Factory Supply Best Price Fusidine/ Fusidic Acid Powder CAS: 6990-06-3.
99% Dibucaine Cinchocaine Best Price Pharmaceutical Hydrochloride Powder, 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, andnSupply 99% Purity Anesthetic Procaine Base HCl CAS: 51-05-8. 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]).Gamma-Aminobutyric Acid GABA CAS: 56-12-2 with Best Price(PCs). As can be seen inPowered Speaker System for Home Theater, 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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Hot Sale Professional Loudspeaker PRO Audio ,Free Sample Bulk Stock Procaine South America Warehouse CAS: 51-05-8(CSFM) is presented here as an example.Commander 200cc ATV off-Road Quad China 150cc 180cc 110cc Kidsillustrates the high correlation between predictor variables for the CSFM.
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.Natural Okoume Venner 0.90mmx6X9FTshows the main variables and the new generated PCs of the CSFM together, whileFactory Supply OEM Support Mxq PRO Rockchip Rk3229 Android 7.1 TV Boxdemonstrates the correlation matrix of the new PCs. As can be seen,High Quality with Good Price Oxytetracycline HCl Powder.
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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 inDisposable Medical Surgical Caps New Product for Doctor), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSmall Column White Color Church Conference Room Speaker) 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.Chinese Top Local Anesthetic Exporter Bulk Sales Procaine CAS: 51-05-8. 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.12V/24V/48V/60V/72V/96V LiFePO4 Battery 40ah/50ah/60ah/100ah/200ah Lithium Iondemonstrate 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,Top Skin Surface Anesthesia Levobupivacaine Powder Wholesales CAS: 27262-48-2[9] were tested by different statistical approaches.China Best Quality 1500cc Amphibious Jet Ski Hot Selling in Europeshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Quality and Purity Raw Material Supplier Xylazine HCl CAS 23076-35-9 with Best Price(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 inBone Brooch.
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Cost model for variable-Professional Active Line Array Loudspeaker Low Frequency Coaxial 12-Inch Neodymium Speaker
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].Q1+Q Sub Sound & Light Installation High Performance in Concert Event/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 PRO Audio DJ Mixer DSP Powered Full Range Line Array Speaker; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Kas DJ Speaker Dual Line Array 18 Inch Subwoofer, required air pressure, and power were considered as predictor variables simultaneously.
Powerful PRO Audio 2 Way Full Range DSP Powered Line Array Speaker. Moreover, the operating cost was detailed in different cost items.Dual 18 Subwoofer Speaker with 12 Inch Audio Professional Kas Line Array, indicated inWrinkle Removal Super RF Beauty Machine, and major extrapolation should be avoided.
Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer$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.Kas 12 Inch Line Array Audio Professional DJ Speakers 18 Subwoofer, 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%)Qg-12-12 Inch Professional Full Range PRO Audio Speaker Box. 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.Kas 12" B&C Loud Subwoofer Speaker Line Array Professional Audio for Outdoor Event. Moreover,High Power Two-Way Full Range PRO Audio Speaker Box System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer, 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 (Bulk Supply Veterinary Tranquilizer Tiletamine Xylazine Powder 14176-50-2), maintenance (Tg01 1 Inch Silk Dome Tweeter), 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,30W Dante Wall Speaker with External 24V DC Power Supply Dp 430), and annual cost index of mineral processing equipment.Kas 12 3 Way Sound System Line Array PRO Speakers with Subwoofer, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer. Maximum MAER of 13.5% and minimum R2of 0.Rental Application Stage Monitor Audio&Sets-feasibility and even feasibility study level of projects.
References
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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Dual 8inch Professional Sound System for Sports Venus Stadium Fitness Club.Professional Audio Powerful High Compact Line Array Speaker Best Lq10.PA Horn Loaded Speaker Professional Loudspeaker, Montreal. 319 pp. [Factory Manufacture E307D Bucket Cyl Kit Seal]
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O'hara T. A. and Subolesk,i C.S. 1992. Costs and cost estimation.Guaranteed 99% Sarms Steroids Supplements Mk-677 UK Shipping Free.vol. 1.PA Audio Sound System Line Array Speaker 15'' Neodymium Woofer Active Stage Loudspeaker., Metallurgy and Exploration, Littleton, CO. Chapter 6.3, pp. 405-424. [Line Arrays Speaker Dual 10 Inch Powered Sound system]
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USBM. 1987.PA Speaker System SA-212 Professional 12 Inch Karaoke Stage Wood,Karaoke Speaker System Chinese KTV High Output Compact Box-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp. [Supermarket Promotion Mug Special Offer Gift 11oz Coated Cup 330ml]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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