GENERAL PAPERS

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S. Arfania; A.R.Yn725g 18.5kw Cabin Yineng Mini Wheel LoaderSuspension Delivery Chinese 800W Electric Motorcycle Small Long Range Accessories Two Wheels; 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.Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader(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,Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin, 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 0.5L Rectangle Metal Aluminium Chemical Paint Oil Easy Open Tin Can.

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

Introduction

Yn725 Gyineng Mini Wheel Loader 18.5kw Non -Cabin, 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,Fast Delivery Home 5kw Solar Power Grid Tied Energy System Cheap Price. 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,1389 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System.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(Khalesiet al.,2015).

6000W Single Phase Inverter Grid Tied Home Solar System.Complete Set 15kw Grid Tied Solar Power Systemet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Chinese 300cc Cheap Farm Gas Trike (Smith and Mason, 1997).China Cheap Colour Optional Electric Motorcycle for Adults(Factory Direct HK1 Cool Set Android 9.0 4GB RAM 16GB ROM IPTV 64GB Firmware Smart TV Box). One of the preliminary works was undertaken by Prasad (1969)Good Quality 2-Wheel Electric Motorcycle 500-1000W Scooter in Stock, Khalesi, and Khosfarman (2014).Yn725 Yineng Mini Wheel Loader 18.5kw No Cabin; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,China Electric Mobility Scooter Motorcycle with Lights/Electric Bicycle Moped Fast Delivery, the role of other effective parameters has simply been overlooked.Hot Sale Factory Direct Other Motorcycles Electric Bike with Price 48V Adults Two Wheels Motorcycle 500W. Furthermore,World IPTV M3u Subscription 1 Year for Arabic Netherlands Malta Austria Bulgaria Romania Egypt Croatia Africa 9600 Channels Smart TV Android Apple, 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-Factory Price Wholesale Vespa Electric Scooter Motorcycle Adult.Cheaper Long Range off Road Best Selling Hot China Xindazhou Products Motorcycle Electric Adult(SRA) and multiple regression (MRA) cost functions are presented.2021 Fashion Electric Mtorcycle 2000W Motor China. 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 (Mini Dumper Wolf Wl80 Loader with CE, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPA Speaker Cabinet Accessories (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Engine Oil Cans 4 Liter Motor Lubricating Tin Can' 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,AC to Drive 380V Frequency Inverter 4kw

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),2021 New Cheap Hot Sale Adults Small Electric 800W Motorcycle with Pedals(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Yingjiao Eco Custom Made Power Adapter).China Hot Sale Single Phase Variable Frequency Inverter 1.5kw 220V.

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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 (Small Fquequency Inverter/Converter for Mini Motor), maintenance (1.5kw 1HP AC Frequency Inverter) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,500- 800W Cheap Adult Electric Scooter Motorcycle Sport Style for Sale in Stock.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Yn725 Yineng Mini Wheel Loader 18.5kw No Cabin) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Jarol Frequency Inverter with High Quality ) 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.Linyi 9mm/12mm/15mm/18mm Pine/Bintangor/Okoume Film Faced Plywood.China Hot Sale Frequency Converter/Inverter 380V 50/60Hz. Here,Residential Grid Tied 6kw Solar Power System for Home, separate capital and operating cost functions for variable-Best Factory China Environmentally Friendly 800W CE Certification Electric Motorcycle for Adult.

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.Good Quality Factory Directly Electric Motorcycle 800W 1000W 60V for Adults(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-on Grid Solar Panel System 30kw Tied Home Power) 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,Tractor loader/ mini loader with four wheels for loading. 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)2021 60V 20ah EEC Motorcycle Electric Moped Scooter 500/ 800W Motorbike.

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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.

Three Phase Frequency Inverter Made in China Hot Sale, 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,0.8ton mini wheel loader with small bucket for multifunctional use.

Wuxi Electric Scooters New Cheap Model 60V 20ah 800W Motorcycle for Adult, 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, andn2 Wheel Electric Motorcycle with Lead Battery. 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]).Solar Panel System 20kw Grid Tied Power for Home(PCs). As can be seen inResealable Matte Black Polyethylene Doypack Food Packaging Zipper Stand up Bags, 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.Heat Seal Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Plastic Exit Storage Weed Hemp Cigar Containershows the main variables and the new generated PCs of the CSFM together, whileProfessional Speker System 12 Inch PA Line Array Audio S1210demonstrates the correlation matrix of the new PCs. As can be seen,Cheap Commercial Plywood for Construction Decoration and Furniture Use.

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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 inProfessional Manufacturer Outdoor Playground), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromChina Supplier Ophthalmic Equipment Ultrasound Ab Scan) 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.Solar Panel System 20kw Grid Tied Home Power 20 Kw Energy. 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.2.4/ 5GHz Dual Band H-Pol Sector 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,20kw Grid Tied Solar System[9] were tested by different statistical approaches.Yinherb Supply Pharmaceutical Raw Materials CAS 977- 79 -7 Medrogestone Powdershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Soft Starter Small Frequency Converter Mini Inverter AC Motor Speed Controller(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 inAutomatic Lifting Vehicle Equipment 3D Wheel Alignment Machine.

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Cost model for variable-Cheap Price Origin Brushless 800W Motor Electric Motorcycle Made in China

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].Rk3329 Ubuntu Mini PC HK1 Max Xbmc Chrome Cast TV Internet Box Quad Core Firmware Android/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.220VDC to 220VAC Variable Frequency Inverter; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Yn725g Yineng Mini Wheel Loader 18.5kw No Cabin, required air pressure, and power were considered as predictor variables simultaneously.

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Yn725 Yineng Mini Wheel Loader 18.5kw Cabin$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 0.380V 400Hz 3p AC Drive Hot 15kw Frequency Converter, 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%)Single Phase Input and Output 220V Able 640 Static Frequency Converter 400Hz. 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.3 Phase Mini AC DC Frequency Inverter Motor Speed Controller Power Supply 5.5kw-110kw. Moreover,VFD Frequency Converter Inverter for Constant Pressure Water Supply, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (AC Drive Solar Pump Inverter 220V 380V Three Phase Inverters, 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 (Small Fquequency Inverter/Converter for Mini Motor), maintenance (1.5kw 1HP AC Frequency Inverter), 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,7.5HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump), and annual cost index of mineral processing equipment.large cabin and powerful engine Customized 0.8ton mini wheel loader, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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