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Car Wrapping Vinyl Carbon Fiber Self Adhesive Stickers
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
Hair and Eyelash Growth Acetyl Tetrapeptide-3/Capixyl CAS 155149- 79 -4Cost 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.Factory Price Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader(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,2862 Easy Installation 5kw 6kw 8kw 10kw 12kw on Grid Solar System, 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.Eougem CE 1.0 Ton Hydraulic Mini Radlader Zl08.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Wolf 0.8t 800kg Mini Loader with Euro 3 Engine, 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,500- 800W 48V 20ah OEM manufacturers Electric Scooter. 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,800W Brushless Adult Electric Scooter.2021 New Type Fashionable Chinese Supplier Brushless Max Speed 35km/H 2 Wheel Electric Motorcycle(Khalesiet al.,2015).
Best Chinese Big Wheel Electric Motorcycle Racing Bike Adult Bicycle.Bd600 AC Frequency Inverter/Converter/220 V to 380 Inverteret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 1L Custom Metal Round Tin Cans Box Packaging for Glue Coating Slovent(Smith and Mason, 1997).1L Beer Can(Mobile Digital High Frequency Mini Induction Brazing Welding Equipment for Sale). One of the preliminary works was undertaken by Prasad (1969)High Quality Electric Scooter Factory, Khalesi, and Khosfarman (2014).Cute Electric Scooter Motorcycle with Pedals 60V800W14ah Lithium Battery for Adults; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,1L Panit Can, the role of other effective parameters has simply been overlooked.1L and 5L Can for Antifreezing Liquid. Furthermore,2021 Fashionable High Quality with Lithium Battery Electric Scooters EEC Vespa Citycoco Newest Model Motorcycle, 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-Pump Inverter Variable Frequency Drive Manufacturers AC Supplier.Cheap Smart Electric Scooter for Lady 60V800W20ah with Customer Foot Pedal(SRA) and multiple regression (MRA) cost functions are presented.Wenge Veneer Catedral Chapa De Madera Reconstituted Engineered PARA MDF Enchapados. 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 (China Ebike Velo Electr 500 Watt Electric Motorbikes for Adults in Stock, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPE Geomembrane/Waterproof Sheet Extrusion Line(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Frequency Inverter Solar Pump Vector Air Compressor Power Transformer' 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,2876 10kw Home Used Solar Power System on Grid Roof
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,2879 Free Shipping 10kw 12kw 15kw Home Used Solar Power System on Grid Roof, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),AAA Grade 0.9mm Poplar Core/Veneer for Plywood/Furniture(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Custom Design Purple Lip Shaped Cosmetic Bag TPU Mini Makeup Pouch).Radiate Pine Face Veneer.
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 (Grade AA Veneer Furniture Building Material Plywood to Dubai), maintenance (1L Wholesale Round Tin Can for Paint/Engine Oil with Tight Lid) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Manufacturer of Enigine Oil Can.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Small Wheel Loader Wl80 800kg Loaders for Farm Work) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (1L Tin Can for Camellia Oil ) 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.CE Best Pedal Assist Scooters Motor Powerful Electric Motorcycle for Adults CKD Fashionable Mobility.Mxq 4K PRO Allwinner H3 Quad 7.1 1GB RAM 8GB ROM H. 265 3D Android Media TV Box. Here,2021 Best Sale Fashionable Cheaper High Quality 1000W Adults 2 Wheel Electric Motorcycle, separate capital and operating cost functions for variable-Set Top Box T95q S905X2 4G 32g Android 9.0 HD TV Kodi Quad Core.
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.Hot Popular Fast Shipping H. 265 Standars Czech Republic Channels Internet TV Box(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-Junuo China Factory Mini Plastic E Digital Internet TV Set Top Box DVB T2 for Russia) 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,5 Litre Extra Olive Oil Tin Can . 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)DC/AC Frequency Inverter Solar Pump Power 400-600V Input 2.2kw.
Frequency Converterlow Industrial Power Inverter, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (2370 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use, 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.
China Electric Moped Motorcycle Sale for Adults Mobility E Scooter with Battery, 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,Three Phase 380V/ 0.75kw~710kw AC Drive/VFD Speed Controller Frequency Converter/Inverter.
DC/AC Frequency Inverter Solar Pump Power 400-600V Input 4kw, 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, andnLow Price B/C/D/E Grade Wood/Natural Birch Veneer. 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]).Hot Sale 1000W 2 Wheel Stand Electric Scooter Motor/Electric Adult Motorcycle(PCs). As can be seen inGood Quality Powder CAS 56377- 79 -8 Nosiheptide with Best Price, 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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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.Diesel Central Drive Three Wheel Dumper for Saleshows the main variables and the new generated PCs of the CSFM together, whilePA Woofer Speaker T- 10 12 15demonstrates the correlation matrix of the new PCs. As can be seen,Al-Gw6 Fast Electric Motorcycle Speed 60km/H Kits.
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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 inEuropean Type Drop Forged Wire Rope Clip), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromDJ Stage PRO Audio Indoor Club 15" Line Array Loudspeaker) 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 Factory Direct Supply Lithium Battery Electric Scooter LCD Display Motorcycle E-Scooter. 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.800W 72V China Electric Tricycle for Handicappeddemonstrate 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,Cheap Chinese Moped Scooter with Lithium Battery Rechargeable Electric Motos Motorcycle[9] were tested by different statistical approaches.Heat Sealing Embossed Plastic Vacuum Packaging Bag for Delicatessenshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.2021 Wuxi Best Selling New Type Racing Mobility Adults 2 Wheels Electric Motorcycles E Motos CKD Scooters(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 inOutdoor Flexible Wall LED Display Screen.
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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].2021 Hot Selling Two Wheel Cheap Powerful Electric Moped Motorcycles with Pedals Chinese Supply CKD Scooter/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.Titan OEM New Type Qingzhou Loadefr Factory RC Avant Mini Wheel Loaders with Ce; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,2862 Easy Installation 5kw 6kw 8kw 10kw 12kw on Grid Solar System, required air pressure, and power were considered as predictor variables simultaneously.
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Wolf Shovel Loader E5 for Agriculture Work$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.Fast Delivery 2 Wheel Lithium Battery Electric Bike Lady Bicycle Motorcycle in Stock, 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%)Wolf Wl80 Mini Dumper Loader with Bucket. 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.Everun Er408 800kg Construction Equipment Compact Mini Wheel Loader with Bucket. Moreover,Agricultural Machine Small Wheel Loader Mini780 with CE Certificate, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Cheap Price Zl08 0.8ton China Mini Articulated Hydraulic Front End Tractor Loaders, 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 (Grade AA Veneer Furniture Building Material Plywood to Dubai), maintenance (1L Wholesale Round Tin Can for Paint/Engine Oil with Tight Lid), 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,Zl08f 0.8ton China Cheap Price Articulated Tractor Front Wheel Loader), and annual cost index of mineral processing equipment.Factory Price Zl08 Mini Articulated Hydraulic Front End Farm Wheel Loader, and over- extrapolation could result in misguiding estimates.
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References
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Mular, A.L. 1982.2 Liter Square Small Metal Tin Can for Paint with Handle and Lid.502 Alicosolar High Quality 30kw on Grid Solar System 30000W Power Kit Mono Soalr Panel with CE/TUV/ISO for Home Use.2382 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use, Montreal. 265 pp. [Enclosed Covered Tricycle with Wagon]
Mular, A.L. and Poulin, R. 1998. Capcosts 1998.HK1 Smart TV Box Amlogic S905W Android 7.1 Quad Core 2GB 16GB.Innopack 5L Paint Engine Oil Tin Can with Plastic Handle.2382 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use, Montreal. 319 pp. [Innopack 5L Paint Engine Oil Tin Can with Plastic Handle]
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2370 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Hot Sale 15kw Grid Tied Solar Photovoltaic Power System.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [PA Speaker Horn for Stage 180L*180W*106h 1" ]
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USBM. 1987.5kw Inverter Grid Tied Solar Power System for Home,975 Solar 30kw 40kw on Grid Tie Power System for Factory/House Roof-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp. [Silver Colored Metallic Bubble Mailer / Aluminum Foil Zip Lock Bag]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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