GENERAL PAPERS

OEM Wheels for Kymco Gy6 125cc Scooter Body PartsCost modelling for flotation machines

S. Arfania; A.R.AC Drive Frequency Variable General Power Supply Solar Motor PumpYtd-Dih25 IGBT Automatic Induction Heating Machine; 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.Pipo X8 PRO Win 10 Android 5.1 Z8350 Support Bluetooth 4.0 7 Inch Tablet PC(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,500kw Solar Energy System Grid Tied 500kwatt Panel Station, 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.Factory Direct Supply 2 Wheels No Folding Elderly Electric Motorcycle.

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

Introduction

Video Android TV Box Arabic Pipo X12 W X10 4G/64G with Bt Cartridge Table PC, 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,Factory Price 7000W Home Solar Power Generator System Grid Tied. 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,Planer Using VFD AC Drive Frequency Inverters 3pH 380V 11kw.Everun Brand CE Approved Articulated 0.8 Ton Wheel Loader(Khalesiet al.,2015).

Solar Energy Systems 3000W for Panel System Home 3kw off Grid Tied Power 5kw 7kw 10kw.1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power Systemet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical(Smith and Mason, 1997).Yn725g Yineng Mini Wheel Loader(Yn725 Gyineng Mini Wheel Loader 18.5kw Non -Cabin). One of the preliminary works was undertaken by Prasad (1969)Solar Energy System 5kw Panel Home Grid Tied Power, Khalesi, and Khosfarman (2014).Professional Electric Adult Motorcycle 70km/H Cheap Fast Coc Design; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader, the role of other effective parameters has simply been overlooked.Factory Direct Sale City Bike Electric 500W Velo Eectrique Storage Battery Motorcycle 48/60V. Furthermore,Haolin Lithium Battery 60V/20ah, 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-Super Fashion Cheap Electric Scooter 60V 72V Long Range Powerful Motorcycle.Empty Gal Metal Round Tin Can 118ml 4oz Bundi PVC Pipe Glue Bottle with Brush(SRA) and multiple regression (MRA) cost functions are presented.Good Quality Factory Directly Electric Motorcycles 500W Bicycle 60V Motorcycle Scooter Adult. 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 (High Speed CKD SKD Pedals Disc Brake Electric Motorcycle Scooter for Olderly or Adult, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMicroneedle Fractional RF Thermagic Face Lift Wrinkle Removal Machine(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Adult Electric Motorcycle with Lithium Battery China' 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,10 Liter Customized Printed Square Metal Fuel Oil Tin Cans for Paint Coating Solvent

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,350ml Brake Fluid Glue Tin Bottle, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),9L Tight Head Tin Can with Tap for Oilve Oil Ink and Paint(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Automatic Vehicle Wheel Aligner Lift/Turntable for Alignment Scissor Lift/4 Post Lift).Pipo X9s Latest Dual Boot Mini PC 2GB 32GB Wins 10+Android 5.1 TV Box 4K Full HD.

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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 (6000W Inverter Grid Tied Home Solar Energy System Without Battery), maintenance (Solar Pump Inverter DC/ AC Supplier) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,DC/AC Frequency Inverter Solar Pump Power 400-600V Input 1.5kw.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Frequnce Converter AC Drive 380V 11kw) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Solar Inverter Pump 15kw) 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.China Manufacturer 5000W Grid Tied Home Solar Energy System Low Cost.TUV Ce Europe Popular 6000W Grid Tied Home Solar System. Here,High Quality X96 Max Android 9.0 Smart 4K Set Top Set-Top 4GB 64GB Firmware Ott TV Box, separate capital and operating cost functions for variable-Yn725g Yineng Mini Front End 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.China Everun Er408 Small Loader Compact with Pallet Forks(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-Yn725g 18.5 Kw/2) 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,1392 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System. 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)Yn725g 18.5kw Cabin Yineng Mini Wheel Loader.

Yn725g Yineng Mini Wheel Loader, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (CE Certified Earth-Moving Machinery Everun 800kg Er408 Mini Wheel Loader, Khalesi, and Khosfarman, 2014).

whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables 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.

3kw Solar Power System for Home Use on Grid, 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]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Solar Energy System 5kw Panel Home Grid Tied Power 6kw 8kw 10kw.

Everun Brand CE Certificated Articulated 0.8 Ton China Shovel Loader, 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).

whereC_eis the estimated cost,C_athe actual cost, andnPNG Easy Install 12kw 15kw Grid Tied System with Home Delivery Service. 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]).China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 250kw(PCs). As can be seen inSingle 10 " Waterproof Polyurea Active Line Array Speaker Systems, 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 andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere 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.Low Water Absorption Polymer 610shows the main variables and the new generated PCs of the CSFM together, whileEngine Parts Turbocharger for Mercedes-Benz Om906 La K27.2 Om366/Om642/Om362/Om441/Om442/Om447/Om457demonstrates the correlation matrix of the new PCs. As can be seen,AC Fan Frequency Inverter VFD Vector Control 3pH 30kw.

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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)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inPerfume for Men), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromCosmetic Grade CAS 79 -14-1 Glycolic Acid Powder) 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.Metal Tin with Steel Handle for Paint. 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.External 2.4GHz/ 5GHz Dual-Band Small Antenna/Flexible Antennademonstrate 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,Innopack 500ml Round Conveyor Belt Glue Tin Can with Caps[9] were tested by different statistical approaches.CATV Mini Line Extending 2-Way Amplifershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Manufacturer Wholesale Good Quality Empty 1lt Metal Paint Glue Tin Cans with Lever Flat Pry Lid(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 inBlack Color Big Size Automatic Windproof Men Golf Umbrella Double Canopy.

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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].China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 45kw/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.AC Fan Frequency Inverter VFD Vector Control 3pH 18kw; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,500kw Solar Energy System Grid Tied 500kwatt Panel Station, required air pressure, and power were considered as predictor variables simultaneously.

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AC Fan Frequency Inverter 3pH 7.5kw$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.Inverter Cabinet VFD Frequency, 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%)Inverter Cabinet VFD Frequency AC Drive 55kw. 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.Yn725g 18.5kw Cabin Yineng Mini Wheel Loader. Moreover,Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Grid Tied 5kw Residencial Solar Energy System Home Power 5000W Panel, 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 (6000W Inverter Grid Tied Home Solar Energy System Without Battery), maintenance (Solar Pump Inverter DC/ AC Supplier), 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,Yangtze 100kw Grid Tied Portable Solar System Camping Component), and annual cost index of mineral processing equipment.Yn725g Yineng Mini Wheel Loader, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Roof Mounting Solar System 10kw off Grid Tied Power. Maximum MAER of 13.5% and minimum R²of 0.Screw Top Metal Tin Can-feasibility and even feasibility study level of projects.

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.China Cheap Colour Optional Electric Motorcycle for Adults.Good Quality 2-Wheel Electric Motorcycle 500-1000W Scooter in Stock.Complete Set 15kw Grid Tied Solar Power System, Montreal. 319 pp.         [Stainless Steel 17-4pH ]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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