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Sign 1325 1530 CNC Router Wood/Metal Engraving Machine
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
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S. Arfania; A.R.5GHz 20dBi Panel WiFi AntennaInverter Cabinet VFD Frequency AC Drives 15kw Motor; 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.Fast Ship 800W 1000W 1200W 60V 72V 20ah Battery Electric Motorcycle From China(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,Hot Sale 2.4/ 5GHz 9dBi Rubber WiFi Antenna, 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 0.5GHz 12dBi Dual Polarity MIMO Omni Antenna.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Electric Motorcycle Fashion Design 800W with Removable Battery, 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,5GHz 18dBi Dual Polarization Panel WLAN Antenna. 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,Guangzhou Manufacturer Empty Anti Bacterial Diesel Additive Can for Fuel Cleaner.Hot Sale Special Cooking Coconut Oil Tin Can Milk Tank Beverage Cans(Khalesiet al.,2015).
Buy Food Grade Metal Material Empty Cans for 0.5-2.5L.Hot Sale 301 401 Easy Opening Seal Can Round Empty Tin with Metal Capset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 139g Stand up Pouch Bag with Clear Window Paper for Coffee Bean Kraft Rice(Smith and Mason, 1997).1 Gallon Metal Can Clear Car Paint Square Empty Engine Oil Tin Cans Latas(Professional Loudspeaker Line Array PRO Audio). One of the preliminary works was undertaken by Prasad (1969)10X5.5'' Best Light 110mm off Road Steel ATV Wheel Rim, Khalesi, and Khosfarman (2014).Central Hole 68mm 10X5.5'' Mild Steel ATV Wheel Rim; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Alloy Wheels , the role of other effective parameters has simply been overlooked.Silver Truck Wheel Rims Steel 17.5 Inch. Furthermore,15-20 Inch Quality Auto Alloy Wheels 4*4 Wheel for Trailer, 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-High Efficiency Waterproof Grid Tied PV Inverter 230V DC to AC.Finished Surface HD Truck Wheel 17.5inch Rims Steel(SRA) and multiple regression (MRA) cost functions are presented.250CC Go Kart . 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 (18mm Carb Birch Okoumen Plywood, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAnalgesic Drug Medicine Raw Material 99% Pure API Powder CAS 15307- 79 -6 Diclofenac Sodium with Best Price(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Retro Electric Motorcycle Scooter ' 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,Carb Approved Birch Plywood
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Carb E0 Cabinet Grade 18mm Plywood in High Quality, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),1.5kw 220V Frequency Inverter Brands AC Drive for Electric Motor(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Custom Logo Cheapest Price Disposable Paper Cups for Cold and Hot Drink).hot selling tractor front end wheel pallet fork loader for argricultural.
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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 (Titan Mini Earthmoving Front End Loader Wheel Zl08 with Ce Certificate), maintenance (Carb Bleach White Poplar Plywood LVL 12mm 18mm) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Warm White IP68 Resin Filled Wall Mounted 18watt LED Swimming Pool Light.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Wolf Loader Wl80 Zl08 Radlader Mini Wheel) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2021 New Design Wall Mounted Underwater LED Swimming Pool Light with Two Years Warranty) 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.High Quality Carb Certified Birch Faced Furniture Plywood.UV Birch Plywood with Poplar Core Carb E0 Glue From Factory. Here,17 Inch 18 Aftermarket New Design Aluminum Car Alloy Rim, separate capital and operating cost functions for variable-China Wolf Wl80 Articulated Mini Loader.
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.Digital ATSC Receiver Internet TV Set Top 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-Vimode Buy 2021 Newest 48V Electric Motorcycles Made in China 800W) 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,High Quality Aluminum Alloy Wheels Rims. 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)Truck Rim Steel Polished 17.5 Inch Wheel.
Sunpal 150kw Solar Grid Tied System Low Price, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (5GHz 19dBi Enclosure WLAN Antenna, 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.
16 17 18 Inch Vossen CV5 Alloy Wheel, 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,VFD Air Compressor Asynchronous Variable Frequency Drive.
Tubeless Steel Wheel , 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, andnHome Application on Grid Tied Solar Power System 3kw. 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]).Home Use Cheap Solar Panel System 10kw Grid Tied Kit(PCs). As can be seen inGy6 150cc EEC Scooter, 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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5GHz Antenna High Gain 32dBi,5GHz Dual Polarization Enclosure WLAN Antenna(CSFM) is presented here as an example.PVC Pipe Extrusion Machine Line/UPVC Production Line/Plastic PVC/UPVC/CPVC Electricity Conduit Tube/ Water Sewage& Pressure Supply Lineillustrates 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.2021 New Model 125cc 150cc Ce Approval off Road ATVshows the main variables and the new generated PCs of the CSFM together, while800kg China Articulated Mini Small Compact Front End Wheel Loadersdemonstrates the correlation matrix of the new PCs. As can be seen,32dBi 5GHz WLAN Antenna.
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 inManufacturer of producers high-quality), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromBathtubs Supplier Freestanding White Bathtub Stand Alone Malaysia Canada) 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.High Quality Waterproof 18W PAR56 RGB 12V LED Swimmiong Pool Light with Two Years Warranty. 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.Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycledemonstrate 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,Nicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lights[9] were tested by different statistical approaches.Electric Scooter with Anti-Theft Motor Lock shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.2.5A 0.4kw IP20 Jarol Variable Frequency Drive(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 inFashion Clothing Men's Knitted Sweater with V-Shaped Intarsia and Reversible Zipper.
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Cost model for variable-No Flicker Glare Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Edison Chip
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 Quality Underwater Swimming Pool Light Decoration LED Lamp/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.17 Inch Machined Aftermarket Alloy Wheel ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Hot Sale 2.4/ 5GHz 9dBi Rubber WiFi Antenna, required air pressure, and power were considered as predictor variables simultaneously.
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5GHz 15dBi Dual Polarization Enclosure WiFi Antenna$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.Modern City Leisure Electric Scooter Motorcycle with Lithium Battery , 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%)White Truck Wheel 17.5X6.00 Steel Rims. 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.7.5kw MPPT with High Efficiency Solar Water Pump Controller. Moreover,Carb P2 AA/Bb Grade Birch/Okoume/Bintangor/Poplar Plywood, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (AC Variable Frequency Drive Single Phase, 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 (Titan Mini Earthmoving Front End Loader Wheel Zl08 with Ce Certificate), maintenance (Carb Bleach White Poplar Plywood LVL 12mm 18mm), 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,17.5X6.75 Heavy Duty Truck Trailer Steel Wheel Rim), and annual cost index of mineral processing equipment.Triple Phase Variable Frequency Inverter AC Drive, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,White Steel Wheel for Truck 17.5X6.00. Maximum MAER of 13.5% and minimum R2of 0.Carb Grade 18mm Commercial Plywood-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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