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



Single 18'' High Power Speaker SubwooferCost modelling for flotation machines

S. Arfania; A.R.Whole Sale Custom Print and Different Color Food Packaging Stand up Pouch Bags with Zipper Window2.5L-25L Square Metal Tin Can with Lid for Paint Glue Adhesives Packing; 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.Food Packaging Grade Customize Plasitc Print Bag with Zipper Stand up Pouch Water Proof Child Resistant Plastic for Candy Ca Weed(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,Food Packaging Bag, 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.High Quality Coffee /Candy/Weed /Hemp Plastic Container.

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


Water Proof Child Coffee /Candy/Weed Plastic Container, 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,10 Inch Coaxial Speaker Professional Driver " Line Array Subwoofer. 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,Electronics ESD Moisture Barrier Aluminum Foil Bag Shielding Anti-Static Plastic for Electronic Parts.Donbn Dz- 10 Two Way Full Range Professional KTV Speaker(Khalesiet al.,2015).

Professional Speaker Double 10'' Neodymium Line Array.10'' Neodymium Coaxial Speaker. 250W & 60W Power Rating PA Audio.et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Single Row Cylindrical Roller Bearing (Smith and Mason, 1997).4-Chloro-4'-Methylbenzophenone High Quality Products CAS 5395- 79 -9(Motorcycle with Dryweight 120-220kg). One of the preliminary works was undertaken by Prasad (1969)55" HD 1080P Commercial LED Screen Video Wall LCD Display, Khalesi, and Khosfarman (2014).A+ grade LCD wall panel surveillance high brightness screen; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Seamless 1920*1080 Pixel High Resolution LCD Monitor 49", the role of other effective parameters has simply been overlooked.PA 10 -35W 5.25'' Sound Ceiling Speaker. Furthermore,Samsung LTI550HN16 1920X1080P screen monitor LCD video wall, 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-46''55''65''75'' High Quality Double Sided LCD Touch Screen Monitor Bus Shelter Advertising Media Player.High Purity Amino Acid L-Arginine Powder(SRA) and multiple regression (MRA) cost functions are presented.High Efficiency 10inch Transducers PS10 for Best PA Speaker. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Active 10 " Line Array with Calss-D Amplifier and Built-in DSP, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inProfessional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;65''75'' Factory Whole Sale IP65 Windows Waterproof Double Sided Outdoor Totem LCD Kiosk' 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,Dual 10 " Outdoor Wooden PA System Bluetooth Trolley Smart Speaker

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Double 10inch Line Array System Box , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Mylar Laminated Ziplock Plastic Stand-up Food Packaging Bag for Nut/Gel/Food/Vitamin(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (New 24V /LCD Screen Massage Gun/ Low Noise Fascia Gun /Amazon Hot-Selling OEM / Available Different Color Professional Exerciser Use).PA /CPP Rotort Pouch.

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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 (China Manufactory Supplier Health Coffee Slimming Anti Ageing Tea Food Packaging Foil Bag Popcorn Envelope Plastic Mylar Pouch), maintenance (Chin Top Supplier Supply L- ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Pharmaceutical Industry CAS 643- 79 -8 O-Phthalaldehyde.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Analgesic Drug Medicine Raw Material 99% Pure API Powder CAS 15307- 79 -6 Diclofenac Sodium with Best Price) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (CAS 79 -14-1 70% Glycolic Acid Powder) 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.Anti-Wrinkle Cosmetic Grade PRO-Xylane CAS-439685- 79 -7.Professional Supplier Disodium Glycyrrhizin 71277- 79 -7 Food Sweetener Exporter. Here,Meeting Room/Entertainment Room/Home Cinema Professional Audio Coaxial Full Range Speaker, separate capital and operating cost functions for variable-Raw Material 99% Tretinoin Powder/Retinoic Acid CAS 302- 79 -4.

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.Bloom Tech API Ceftriaxone Sodium 104376- 79 -6(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-St-10 10kw St-12 12kw St-15 15kw St-20 20kw Generator Alternator) 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,Generator Automatic Controller Eim 258 -9754 Engine Interface Module. 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)99% Pure High Quality Anesthetics Cinchocaine 85- 79 -0.

Custom Printed Food Grade Ziplock Plastic Pouch Packaging Bag, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PA /Pet/PE/Kraft Laminated Printing Stand up Pouch Food Grade, 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.

Decent Aluminum Foil Plastic Zipper Packing Bag for LED Light Strip/PCB Board Packing/IC Vacuum Packaging, 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,High Temperature Vacuum Retort Pouch for Food Packaging.

Oxygen Absorbers Food Packaging Vacuum Packed Bag for Cookies, 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, andnThermoforming Nylon/Ny Frozen Chicken Meat Packing Vacuum Sealer Bag. 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]).High Barrier Vacuum Bag& Packaging Films for Food Pakcing(PCs). As can be seen inBulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9, 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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Oxygen Barrier Transparent Vacuum Plastic Bag,Professional Audio High Powerful Ka Dual 10inch DSP Active Line Array Speaker(CSFM) is presented here as an example.16/24 Channel RF Combiner Passive Mixerillustrates 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.Sy-A041 Medical Equipment Portable Ophthalmic Ultrasound a/B Scannershows the main variables and the new generated PCs of the CSFM together, whilePerfect Laser Rotary DOT Peen Marker for Saledemonstrates the correlation matrix of the new PCs. As can be seen,DC 24V Alternator Generator Speed Control Board Interface Module Eim258-9755.

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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 inHDMI Wire Harness for Computer), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from5.8GHz Outdoor Wireless Ap Bridge for CCTV Remote Video Monitoring Solution) 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 0.7 Layers or 9 11 Co-Extruded Freezer Food Storage Bag. 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.Water Treatment Softener Dibasic Sodium Phosphate 97% Powder CAS No.: 7558- 79 -4demonstrate 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,Professional Audio 350W Sound System Single 10 Inch PRO Line Array Speaker [9] were tested by different statistical approaches.Custom Plastic Vacuum Bag for Rice Packaging Bricks Bagsshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Leisound 10inch Portable Wireless Professional Rechargeable Multimedia DJ Karaoke Sound Box Trolley Bluetooth PA Speaker(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 inHand Sanitizer Alcohol Liquid Antibacterial Instant Hypochlorous Acid Non-Contact Automatic Soap Foam Aromatherapy Aloe Leave-on Spray Sterilization.

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Cost model for variable-10 Inch High Quality PA Speaker 10tbx100

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].PA Audio System 5" 10 -35W Ceiling Speaker/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.Ultra Low Nosie 10 Channles Mixer Mixing Console ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Food Packaging Bag, required air pressure, and power were considered as predictor variables simultaneously.

10''stage professional Audio Speaker H- 10 for Stage. Moreover, the operating cost was detailed in different cost items.42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk, indicated inEverun Er08 CE Wheel Loader with Standard Bucket for Sale, and major extrapolation should be avoided.

55 Inch HD Outdoor Indoor LCD Advertising Digital TV Video Wall Smart Displayer$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.Horn Speaker M-776, 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%)55 Inch Stand Alone Digital Photo Booth LCD Advertising Display. 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.Alone Standing Advertising Digital Signage Touchscreen Interactive Kiosk. Moreover,USP Raw Diclofenac Sodium White Powder for Antipyretic Analgesics CAS 15307- 79 -6, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Wilson Parts Eim Module Engine Interface Control 258 -9753, 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 (China Manufactory Supplier Health Coffee Slimming Anti Ageing Tea Food Packaging Foil Bag Popcorn Envelope Plastic Mylar Pouch), maintenance (Chin Top Supplier Supply L- ), 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,Generator Engine Interface Module Controller Eim Plus 24V 258 -9756 for Fg Wilson), and annual cost index of mineral processing equipment.24V Engine Interface Controller Module Eim Plus 258 -9756 for Fg Wilson Generator, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Medrogestone Top Quality Low Price 977- 79 -7. Maximum MAER of 13.5% and minimum R2of 0.Factory Supply High Quality Ademetionine 1-feasibility and even feasibility study level of projects.


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Lashgari, A.Kinetin; CAS No: 525- 79 -1; 6-Furfurylaminopurine; 6-Kt, A.R. 2013.Good Quality CAS: 97240- 79 -4 Topiramate Powder Price,High Purity 99% Intermediate 1,vol. 23. pp. 441-446.         [Shellac Neon Color UV Soak off Nail Gel Polish 24 Colors]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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