GENERAL PAPERS

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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.Adult Electric Motorcycle with Lithium Battery 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,Good Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery, 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.Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycle.

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

Introduction

Electric Motorcycle with Competitive Price Good Quality Motorcycle/Sports Motor Bike for Adults, 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,Solar Inverter Pump Inverters 5.5kw. 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,10 Liter Customized Printed Square Metal Fuel Oil Tin Cans for Paint Coating Solvent.350ml Brake Fluid Glue Tin Bottle(Khalesiet al.,2015).

9L Tight Head Tin Can with Tap for Oilve Oil Ink and Paint.Pipo X9s Latest Dual Boot Mini PC 2GB 32GB Wins 10+Android 5.1 TV Box 4K Full HDet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 0.8 Ton Mini Front Loader Wl80 Shovel for Garden/Farm(Smith and Mason, 1997).6000W Inverter Grid Tied Home Solar Energy System Without Battery(Engine Interface Model Eim 630-465 630-466 630-088 Olympian Massey Module Replace Fg Wilson Speed Controller 258 -9753 -9755 12V 24V). One of the preliminary works was undertaken by Prasad (1969)Solar Pump Inverter DC/ AC Supplier, Khalesi, and Khosfarman (2014).DC/AC Frequency Inverter Solar Pump Power 400-600V Input 1.5kw; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Frequnce Converter AC Drive 380V 11kw, the role of other effective parameters has simply been overlooked.Solar Inverter Pump 15kw. Furthermore,China Manufacturer 5000W Grid Tied Home Solar Energy System Low Cost, 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-TUV Ce Europe Popular 6000W Grid Tied Home Solar System.High Quality X96 Max Android 9.0 Smart 4K Set Top Set-Top 4GB 64GB Firmware Ott TV Box(SRA) and multiple regression (MRA) cost functions are presented.Yn725g Yineng Mini Front End Loader. 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 (China Everun Er408 Small Loader Compact with Pallet Forks, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAuto Engine Diesel Parts Fuel Injector Common Rail Nozzle Dlla162p2266(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Yn725g 18.5 Kw/2' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Everun Brand CE Certificated Articulated 0.8 Ton China Shovel Loader(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Bluetooth Truck Bed LED Light Strip Headlight Tube Strobe Lights).PNG Easy Install 12kw 15kw Grid Tied System with Home Delivery Service.

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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 Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 250kw), maintenance (Yangtze Solar Power Grid Tied System Home 5kw 5K) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hot Sale and Competitive Price Electric Motorcycle Scooter for Daily.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (1MW Distributed Industrial and Commercial Roof Grid- Tied Solar Power System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (AC Fan Frequency Inverter VFD Vector Control 3pH 30kw) 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.3 Liter High Quality Customized Square Printed Tin Cans for Oil/Paint.Metal Tin with Steel Handle for Paint. Here,Innopack 500ml Round Conveyor Belt Glue Tin Can with Caps, separate capital and operating cost functions for variable-Manufacturer Wholesale Good Quality Empty 1lt Metal Paint Glue Tin Cans with Lever Flat Pry Lid.

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.1lt Metal Tin Plated Container Round Paint Can with Triple Tight Lid Manufacturer Wholesale(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-China Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 45kw) 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,AC Fan Frequency Inverter VFD Vector Control 3pH 18kw. 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)Inverter Cabinet VFD Multifuctional Frequency Inverters 55kw.

AC Fan Frequency Inverter VFD 3pH 15kw, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (AC Fan Frequency Inverter 3pH 7.5kw, 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.

Inverter Cabinet VFD Frequency, 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,Inverter Cabinet VFD Frequency AC Drive 55kw.

Yn725g 18.5kw Cabin Yineng Mini Wheel 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, andnYn725g 18.5kw No Cabin Yineng Mini Wheel Loader. 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]).Grid Tied 5kw Residencial Solar Energy System Home Power 5000W Panel(PCs). As can be seen inChina 800kg Mini Articulated Front End Wheel Loader Cm908 with Parts for Sale in Dubai, 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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Yn725g Yineng Mini Wheel Loader,Roof Mounting Solar System 10kw off Grid Tied Power(CSFM) is presented here as an example.Motor Tricycle Three Wheel Cargo Trike for Saleillustrates 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 Popular Model 60V 800W Electric Motorcycle for India Marketshows the main variables and the new generated PCs of the CSFM together, while2021 Popular Great Large 5.95 Meter Swimming Pool Laswim Bathtub Hot Tub SPAdemonstrates the correlation matrix of the new PCs. As can be seen,Screw Top Metal Tin Can.

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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 inAbnormity Glazed Porcelain Mug of Syb031), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromChina Single Phase Variable Frequency Inverter 1.5kw) 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.Best Selling! 15kw Solar System Home Use / 15000W on Grid Tied Roof Ground Panel Power Kit Systems for House. 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.32oz Metallic Glue Tin Can_1liter with Screw Cap and Brushdemonstrate 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,Yn725g 18.5kw Cabin Yineng Mini Wheel Loader[9] were tested by different statistical approaches.High Efficiency SIM Card Fiber Laser Marking Machineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader(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 Baby Knitted Pullover with Cotton Acrylic for School Garments.

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Cost model for variable-Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin

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].5L Rectangle Metal Aluminium Chemical Paint Oil Easy Open Tin Can/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.Yn725 Gyineng Mini Wheel Loader 18.5kw Non -Cabin; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Good Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery, required air pressure, and power were considered as predictor variables simultaneously.

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Full HD Media Player Minix Neo N42c-4 N4200 4G 32g Internet Games Online Play Racing Windows 10 Smart Set Top Box Support Google Apk Install$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 0.6000W Single Phase Inverter Grid Tied Home Solar System, 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%)Complete Set 15kw Grid Tied Solar Power System. 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.China Cheap Colour Optional Electric Motorcycle for Adults. Moreover,Good Quality 2-Wheel Electric Motorcycle 500-1000W Scooter in Stock, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Yn725 Yineng Mini Wheel Loader 18.5kw No Cabin, 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 Vector Control AC Drives / Frequency Inverter Manufacturer 3pH 250kw), maintenance (Yangtze Solar Power Grid Tied System Home 5kw 5K), 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,China Electric Mobility Scooter Motorcycle with Lights/Electric Bicycle Moped Fast Delivery), and annual cost index of mineral processing equipment.Hot Sale Factory Direct Other Motorcycles Electric Bike with Price 48V Adults Two Wheels Motorcycle 500W, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,World IPTV M3u Subscription 1 Year for Arabic Netherlands Malta Austria Bulgaria Romania Egypt Croatia Africa 9600 Channels Smart TV Android Apple. Maximum MAER of 13.5% and minimum R²of 0.Factory Price Wholesale Vespa Electric Scooter Motorcycle Adult-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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