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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017Â


Cheap Popular Pattern 3.00-18 Motorcycle TyreCost modelling for flotation machines

S. Arfania; A.R.Replica Aluminum Alloy Wheels for Volkswagen VW Tiguan Atlas TouaregPRO Audio PA System Digital Mixer; M.R. Khalesi

Tarbiat Modares University, Iran


Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.Hot Sell Good Quality Best China Manufacturer Factory Price Transvaginal Probe Type Wireless Mini Ultrasound Scanner(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,Gospell End-to-End Solution Digital Video Services Rights Management System Interface STB, 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.Medical Automatic Ultrasound Bone Densitometer in Low Price.

Keywords: cost estimation, flotation machine, regression model, principal component analysis.


Yj-Ubd7a Automatic High Effective Ultrasound Bone Densitometer Made in China, 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,Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scanner. 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,IN-A4CPL Portable Wireless WiFi ultrasound color doppler scanner machine.Automatic High Effective Ultrasound Bone Densitometer Made in China(Khalesiet al.,2015).

Diesel Central Drive Three Wheel Dumper for Sale.Chinese Product Best Price Microconvex Wireless Mini Ultrasound Scanneret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Solar Inverter Pump 15kw(Smith and Mason, 1997).Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital(High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers). One of the preliminary works was undertaken by Prasad (1969)Apr125 White Motorcycle, Khalesi, and Khosfarman (2014).Apr125 Red Motorcycle; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Apr125-2 White Motorcycle, the role of other effective parameters has simply been overlooked.Underwater Swimming Pool Light Decoration LED Lamp. Furthermore,IN-AC5MC USB mobile scan cheapest pocket handheld hospital ultrasound scanner, and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Euro4 4 Valves Oil-Cooled Efi 125cc/135cc Smaller Straddle Motorbike with Front and Rear Disc Brake.350cc Motorcycle with Double-Cylinder & Water-Cooled Engine (SRA) and multiple regression (MRA) cost functions are presented.Popular Medical Device Automatic Bone Densitometer. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Diesel Cargo Three Wheel Tricycle for Sale From China, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDSP Active Line Array Speaker(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Diesel Dump Central Steering Drive Three Wheeler From China for Sale' 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,800W Electric Motorbike with Front Disc Brake

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Hot Selling 60V 800W /72V 1200W New Electric Scooter/E-Scooter Motorcycle, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),dB002e Hot Sell Electric Motorcycle 800W and Kids 500W with Ce for(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Indoor HD Full Color Best P2.6 LED Screen).350W/500W/ 800W /1000W/1200W Motor Electric Scooter EW-519 Classis Model.

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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 (800W 60V20ah Lead-Acid Battery Electric Scooter Motorcycle), maintenance (New Energy Pedal Electric Scooter Max Speed 35km/H 350W 500W 800W Motor Power) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,5GHz 30dBi Grid Parabolic Antenna .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (5GHz Dish Parabolic Antenna 29dBi) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2.4/ 5GHz Dual Band H-Pol Sector Antenna) 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.Electric Dirt Bike Zm-Es18 with 500W- 800W Motor.5GHz 20dBi Enclosure WLAN Antenna. Here,5GHz 45deg Dual Pol Sector Antenna, separate capital and operating cost functions for variable-5GHz 23dBi Enclosure WiFi Antenna.

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.5GHz Dual Pol Sector Antenna with Enclosure (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-5GHz 34dBi Dish WLAN Antenna) 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,5GHz 18dBi Dual Polarization Sector WiFi Antenna. 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)18W RGB Resin Filled LED Surface Mounted Underwater Pool Light.

Poplar Film Faced Plywood Board with Carb Certificate, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (18W 12V IP68 Waterproof LED Swimming Pool Lamps, 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.

Hot Sale on-Grid 20kw Grid Tied Solar Power Home System, 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,E1 Glue Malamine Mositure-Proof MDF with Carb Certification.

High Quality Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports, 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, andnQuality 18mm Carb Birch Okoumen Plywood. 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]).Mini Wheel Loader Er08 with Hydrostatic Transmission System for Sale(PCs). As can be seen inProfessional Speaker System Single 10 Inch 300W Mini Stage Monitor PS10r2, 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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New Condition Large Capacity Mini Truck Dumper,IP68 Resin Filled Wall Mounted Swimming Pool Light with Two Years Warranty(CSFM) is presented here as an example.Factory Sale Big Pickup Tricycle with 300cc Water Cooled Engineillustrates 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 Sale Vacuum Bag Nylon Material for Agricultural Productsshows the main variables and the new generated PCs of the CSFM together, whileProfessional Audio Speaker Dual 10 Inch Neodymium Line Arraydemonstrates the correlation matrix of the new PCs. As can be seen,50cc 150cc 200CCC 300cc Adult EPA/Ce 3 Wheel Gas Scooter.

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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 inHigh Quality Oft Brand2008 Honda Civic Serpentine Belt S8m), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromUSP Raw Diclofenac Sodium White Powder for Antipyretic Analgesics CAS 15307- 79 -6) 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 0.150ml Plastic Clear White Bullet Liquid Bottle for Cosmetic Industry. 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.4seats 1500cc Kartdemonstrate 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,14" to 22' Inch Replica Aluminum Alloy Wheel for KIA Rims[9] were tested by different statistical approaches.Home or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Serviceshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Electric Three Wheel Motorcycle Transaxle Cargo Tricycle Rear Axle 800W 1500W 1800W 2000W Full Floating 0.5ton~1.2ton Accessories(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 inManufactory Direct KN95 Protection Masks.

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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].Building Material Commercial Plywood with Carb to Europe/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.


Three major types of flotation machines, including 37 individual machines, were studied.AL908 800kg Rated Load Wheel Loader with CE Approved for Sale; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Gospell End-to-End Solution Digital Video Services Rights Management System Interface STB, required air pressure, and power were considered as predictor variables simultaneously.

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Haiqin Brand 0.8ton Mini Loader $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.Jarol Solar Inverter 5.5kw 3 Phase, 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%)Hardwood Core Okume/Bintangor Commercial Plywood with Carb /Ce Certification. In the MRA cases, this property is owed to the SFM (3.05%).


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.Textile Crane Centrifugal 380V Variable Frequency Drive VFD. Moreover,2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (AL908 Wood Gripper Wheel Loader with Euro III Engine for Sale, 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 (800W 60V20ah Lead-Acid Battery Electric Scooter Motorcycle), maintenance (New Energy Pedal Electric Scooter Max Speed 35km/H 350W 500W 800W Motor Power), 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,Inverter Cabinet VFD Frequency AC Drives 15kw Motor), and annual cost index of mineral processing equipment.2021 New Design Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with Edison Chip, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,12V RGB Resin Filled Underwater Pool Lights with 2 Years Warranty. Maximum MAER of 13.5% and minimum R2of 0.loader with excavator grapple wheel mini for sale good quality-feasibility and even feasibility study level of projects.


Camm, T.W. 1994.24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah.2ND Generation Ultrasound Bone Densitometer,vol. 46, no.6. pp. 559-562.         [AC Frequency Speed Controller 7.5kw VFD Drives]

Huang, X. X., Newnes, L. B., and Parry, G.C. 2012. The adaptation of product cost estimation techniques to estimate the cost of service.International Journal of Computer Integrated Manufacturing,vol. 25, no. 4-5. pp. 417-431.         [Experienced 0.40 Inch Dual Digit 14 Segment SMD LED Display Chinese Supplier]

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Kaiser, H.F. 1960. The application of electronic computers to factor analysis.Educational and Psychological Measurement,vol. 20. pp. 141-151.         [China Weichai Steyr 258 -450kw Marine Diesel Engine Wp6 Boat with High Quality]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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