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S. Arfania; A.R.Living Room FurnitureExcellent Mechanical High Transparency Transparent Nylon PA12 for Glasses; 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.Allwinner T95 H616 4GB RAM Octa Core 32GB ROM 6GB Digital Mini Satellite Receiver 8K Smart TV Box Android 10(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,Cheapest Set Top Box Mxq PRO Rk3229 Android 7.1 Quad Core 1GB 8GB TV, 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.Nordic Leather Sofa Modern Simple Three Seats.

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

Introduction

Best Selling Modern Design Living Room Classic Leather Recliner Massage Chinese Home Furniture, 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,Wholesale Folding Bed Space Saving Furniture Sofa Modern Recliner. 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,Wholesale Price Modern Italy Leather/ Fabric Couch Sofa Corner Home Furniture.2021 New Modern Design Living Room Leather Sofa(Khalesiet al.,2015).

Tx6s H616 4GB 32GB VGA IPTV Brasil Android RAM ROM 6GB 8K 2GB 16GB 10.0 2021 Box TV.2021 Modern Design Leather Chesterfield Home Furniture Leisure Sectional Sofaet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports(Smith and Mason, 1997).High Quality European Style Modern Furniture(Gurjan Veneer Keruing). One of the preliminary works was undertaken by Prasad (1969)2021 Wholesale Foshan Chinese Real Leather Living Room Sofa Modern Furniture , Khalesi, and Khosfarman (2014).VFD Ultra-Low-Noise Delixi 55kw 720va Variable Frequence Inverter; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Modern Home Furniture Living Room Leather Fabric Electric Massage Lounge Leisure Recliner Sofa, the role of other effective parameters has simply been overlooked.7.5kw VFD Drives/ Frequence Inverter/Converter/ AC Drive Enc. Furthermore,Wholesale Folding Bed   Recliner Sofa Beds Fabric, 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-Modern Furniture.Foshan Factory Wholesale High Quality Living Room Leather Sofa(SRA) and multiple regression (MRA) cost functions are presented.Tx6s H616 32GB ROM Recorder Android 4GB RAM Stick Set Top 2021 SIM Card Ott WiFi Andriod Smart TV Box. 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 (Motor Electronic Power Frequency Converter 380V 2.2kw, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inBluetooth 5.0 Headset Mini Tws True Wireless Earbuds Stereo Bass in-Ear Earphone(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Pipo X8 Mini PC Smart TV Box' 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,Mini Variable-Frequency Drive/ VFD /Adjustable-Frequency Drive /Afd/ Variable-Voltage/Variable-Frequency /Vvvf/Drive/ Variable Speed /VSD/AC

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Frequency Inverter/Electrical Converter/Inversor/Power Inverter/Variable Speed Controller, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),50 to 60 Hz Frequency Converter(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Stainless Steel Food Grade Clamp Manual Diaphragm Valve).AC Variable Vector Frequency Inverter.

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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 (Chinese Supplier of Variable Frequency Drive/AC/DC Motor Speed Controller), maintenance (AC Drive Solar Charge Controller 3 pH Inverter Welding Machine Elevator Motor Price) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,AC Drive Frequnce Converter 5.5kw Pump Use .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (0.8 Ton Mini Wheel Loader with Lowest Price) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (VFD AC Drive) 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.Automatic Motor Speed Controller Variable AC Drive 1/3 Phase 1.5 Kw 220 V/380 V.Water Pump Frequency Inverter. Here,Small Variable-Frequency Drive , separate capital and operating cost functions for variable-VFD Motor Drive Inverter Converter 1.5kw / 2.2kw 220V Variable Frequency.

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.VFD AC 380V 1.5kw Three Phase Inverter Frequency Converter Variable Drive(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-Variable Speed Drive MPPT Motor Controller Solar Pump Inverter Power Supply) 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,Compact Mini Farm Loader 800kg Wheel for Sale. 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)Frequency China Vector Control AC Drive Power Supply Inverter Solar Converter.

0.8ton Zl08f Small 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 (Loading Machine, 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.

Mini Radlader with Ce for Germany and Sweden Market, 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,China Compact Payloader Zl08 Mini Front End Wheel Loader with Ce.

Farm Equipment 800kg Small Loader Payloader for Sale, 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, andnThree Phase AC Variable Speed Frequency Converter Fan Motor Pump Controller. 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]).0.8t Multifunctional Hydraulic Wheel Loader for Farm(PCs). As can be seen inHigh Quality 99% Ethylamine Hydrochloride CAS No 557-66-4 ISO 9001 Certificate, 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.PA Resin for Gravure Plastic and Paper Printing Inkshows the main variables and the new generated PCs of the CSFM together, whileCrovell Factory Supply High Quality CAS 79 -57-2 Oxytetracyclinedemonstrates the correlation matrix of the new PCs. As can be seen,Avant Zl08f Mini Wheel Loader for Sale.

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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 inRoman Roof Tile Making Machine Eagle Steel Concrete), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromManufacturer Supply 1) 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.Frequency Converter 0.5 HP. 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.PMMA GPPS Sheet/Board Plastic Extruder Machine/Making Machinedemonstrate 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,125HP Elevator Inverter Price Electronics 220V 240V Three Phase Pump[9] were tested by different statistical approaches.3 Phase Mini AC DC Frequency Inverter Motor Speed Controller Power Supply 5.5kw-110kwshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Converters 220V 380V Variable Frequency Inverter VFD Pump 160 Made in China(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 inBest Distributor Factory Exports Saso Ce UL 5W E27 Bulb Energy Saving LED Lighting Made in China for Office.

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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].Frequency Converter Three Phase Variable Speed Drive 220kw Generator Air Pump/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 Manufacturer 3 pH Compressor Solar Pump Inverter VFD Voltage Converter; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Cheapest Set Top Box Mxq PRO Rk3229 Android 7.1 Quad Core 1GB 8GB TV, required air pressure, and power were considered as predictor variables simultaneously.

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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.Mini Loader/Small Wheel Loader Zl08 with CE. Moreover,China Original Mini Bucket 0.8ton Wheel Loader Yz908 Construction Equipment, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Small Wheel Loader Zl08 CE, 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 (Chinese Supplier of Variable Frequency Drive/AC/DC Motor Speed Controller), maintenance (AC Drive Solar Charge Controller 3 pH Inverter Welding Machine Elevator Motor Price), 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,Mini Small Hot Sale in Europe Wheel Loader for), and annual cost index of mineral processing equipment.Supper Mini Wheel Loader Hzm908 Zl08f 0.8ton Compat Small Backhoe, 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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