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Mini SPA Tub Outdoor Acrylic Glass Enclosed Bathtub
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
Motorbicycle for Well Done AccessoriesCost modelling for flotation machines
S. Arfania; A.R.Vimode Electric Scooter Adult Motorcycle for Adults 800WAL908 800kg Rated Load Wheel Loader with CE Approved for Sale; 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.150cc/200cc/250cc / 300cc Three Wheel Cargo Motorcycle /Tricycle(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,Heavy Duty Tricycle 250cc, 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.Electric Motorcycle Fashion Design 800W with Removable Battery.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
City Scooter 800W Long Range Electric, 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,800W Electric Scooter Motorcycle Bicycle with Folding Rack. 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,Wholesale Adult Tricycle Price Adults Tuk Motorcycle in India.Sporty 500W/ 800W /1000W(Khalesiet al.,2015).
5GHz 10dBi Outdoor WiFi Omni Antenna .Ho-500 Ce Approved High Quality Eye Diagnosis System Ophthalmic Ultrasound Scanneret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for off Grid PV Panel Generator Solar Energy Power System 3kwh for Home/Outdoor Lighting(Smith and Mason, 1997).Market Hot Two Wheel 800W 72V 32ah Electric Scooter/Motorcycle From China(PRO Dante Audio 30W DSP 6 Inch Plastic Mini Active in Wall Mounted Loud Speaker Pairs Supports 24VDC or Poe Power for PA System Public Address). One of the preliminary works was undertaken by Prasad (1969)Vimode 2021 New Trend 800W 1000W 1500W China Adult Electric Motorcycle Sale, Khalesi, and Khosfarman (2014).Police Motorcycle 250cc; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,125cc Scooter EEC Popular Motor Alex, the role of other effective parameters has simply been overlooked.250cc Three Wheel Cargo Motor Tricycle . Furthermore,Motorbicycle with Stable Wheels, 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-2021 60km/H Electric/Pull Starting System 4 Stroke 150cc Adult Gasolina Gokart Kart Racing Go for Sale Cheap.Scooter with Stable Function and Nice Outside Looking(SRA) and multiple regression (MRA) cost functions are presented.Motorcyle for Both Oil and Water Cooling. 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 (150cc China Gas Motor Cargo Trike for Sale , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWater Cooling Diesel Engine with 6-Cylinder for Power Generator(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Sw-1000p Ophthalmic Pachymeter' 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,5GHz 30dBi Mimo Dish Antennas
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,China Factory Supplier Ophthalmic Equipment Ab Scan, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Internal 2.4GHz/ 5GHz Antenna/TV Antenna/Stainless Steel with Rg1.13 Dual-Band Antenna(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Health Food Glass Container/ Packaging/ Bottle).24 Channels Fixed Modulator.
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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 (5150-5850MHz Sector Panel Antenna 2*17dBi), maintenance (12" 13 Inch Aluminum Alloy and Steel Wheel for Minicar) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Replica Aluminum Alloy Wheels for Skoda.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Best Price Sab-500 Ophtalmic Ab Scan) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Portable Full Digital Ophthalmic a/B Ultrasound Scanner Mslmd25) 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.Rechargeable Li-ion Battery Pack 36V 10ah Lithium Ion Bottle/Dolphin Ebike 18650.80kw Grid Tied Solar System for Commercial or Industrial Use. Here,Ho-500 High Quality Ophthalmic Ultrasound Eye Diagnosis System, separate capital and operating cost functions for variable-Replica Aluminum Alloy Wheels for Jaguar Xe/Xf/Xj/E-Pace/F-Pace/F-Type.
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.Ophthalmic Equipment Biometer Scan a(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-0-20dB 75 Ohm CATV Variable Adjustable Attenuator Equalizer) 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,860MHz CATV One Way Amplifiers. 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)CATV Mini Line Extending 2-Way Amplifer.
20MHz Probe Ophthalmology Ultrasound MD-2300S, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (860MHz Two Way Amplifier , 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.
Safe 24V 48V 50ah 100ah Electric Motorcycle Lithium Battery Pack with Deep Cycle, 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,Ophthalmic a Scan Portable Handheld Biometer.
Ebike Battery Pack Li-ion 36V 10ah Lithium for Electric Scooter with Long Cycle Life, 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, andnAllsparkpower Solar 48V 5kw Inverter 10kwh Lithium Ion LiFePO4 Battery Storage for Home Power 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]).500W Air-Cooled Wide Band UHF Digital TV Transmitter DTV(PCs). As can be seen inPE Waterproof Roll Extrusion Machine, 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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High Energy Density Rechargeable 36V 48V 40ah 30ah 20ah Lithium Battery Pack for Electric Bicycle,Home Solar Energy Storage System 3.2V Battery Bank LiFePO4 100ah 50ah 20ah 10ah Lithium Pack(CSFM) is presented here as an example.Pigment Violet 1 or Fast Rose Toner/Fast Lakeillustrates 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.10inch Professional Karaoke Speaker for Luxury Roomshows the main variables and the new generated PCs of the CSFM together, while3 Seats 3000W 4 Wheel Mobility Disabled EEC/Coc Electric Mini Car with Lithium Batterydemonstrates the correlation matrix of the new PCs. As can be seen,1380 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System.
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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 inSupply Inventory 99.7% Min Silver Sulfate CAS 10294-26-5 Thickener), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from3293 Fast Rose Lake B Pigment ) 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 0.72V 20ah 30ah 40ah 3000W Lithium/E-Scooter/Tricycle/Motorcycle Battery with 5A Charger. 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.DC/AC Drive Inverter Solar Pump Converter 1.5kw Motor Green Energydemonstrate 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,China 800kg Mini Articulated Front End Wheel Loader Cm908 with Parts for Sale in Dubai[9] were tested by different statistical approaches.Custom Zip Bag Plastic Stand-up Pouch Sweet Child Proofshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Everun Er08 CE Wheel Loader with Standard Bucket for Sale(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 inNylon IEC IP44 220V Industrial Plug and Socket.
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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].Wholesale Factory 12V 200ah Lithium Ion LiFePO4 Battery 24V/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.Loader; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Heavy Duty Tricycle 250cc, required air pressure, and power were considered as predictor variables simultaneously.
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Closed Motorized China Cargo Tricycle with Box $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.Covered Tricycle Carriage Closed Cargo Box, 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%)Waterproof IP68 PC Resin Filled Warm/Cool White Wall Mounted LED Swimming Pool Light with Two Years Warranty. 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.0.8 Ton Garden Samll Loader 800kg Mini Front End 8 7 6 5 4 3.5 3 2.5 2 1.5 1 Wheel. Moreover,Metal Packing Chemical Round Tin Can, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (1 Liter Cans for Curing Agent, 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 (5150-5850MHz Sector Panel Antenna 2*17dBi), maintenance (12" 13 Inch Aluminum Alloy and Steel Wheel for Minicar), 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,Cone Top 1 Liter Glue Usage Tin Can), and annual cost index of mineral processing equipment.High Quality 1.2ton Loading Compact Loader Hr912 with Snow Bucket, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Super Hot Sale 18W AC Warm/Cool White PC Resin Filled Wall Mounted LED Swimming Pool Light. Maximum MAER of 13.5% and minimum R2of 0.PC Epoxy Resin Filled Wall Mounted 12V AC 18W RGB Pool Light IP68 with Two Years Warranty-feasibility and even feasibility study level of projects.
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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