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.10L Customized Tin Cans Paint Coating Used Metal Square Can(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,500W/ 800W / 1000W E Scooter/Electric Moped/Electric Bike, 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.Square Engine Oil Can Metal Paint Tin Container with Plastic Lid.

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

Introduction

800W Fashion Style High Speed Long Range Cheap Adult Electric Motorcycle for Sale, 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,Cheap Small Electric Scooter Moped 800W Motorcycle. 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,Frequency Converter for Small Power Motors 3pH 380V 50/60Hz.Manufacturer of Rectangular Brake Oil Motor Engine Tin Can(Khalesiet al.,2015).

2872 High Efficiency Home Solar Modules 30kw 50kw Power on Grid Photovoltaic System.Automobile Paint Can 5L Square Tin with Metal Cap for Ink Oilet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Free Sample Local Anesthetic Novocaine Painkiller Cream Solution Procaine CAS: 51-05-8(Smith and Mason, 1997).866 5kw on Grid Solar System with Power Inverter for Home(Everun CE Approved 0.8 Ton Front End Loader). One of the preliminary works was undertaken by Prasad (1969)Food Grade Metal Tin Can with Printing Logo for Cooking Oil, Khalesi, and Khosfarman (2014).Good-Tightness Square Tin Can Metal Engine Oil with Sscrew Lid; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,800W Electric Scooter , the role of other effective parameters has simply been overlooked.Good-Sealing Square Tin Can Engine Oil with Metal Lid. Furthermore,0.15mm-1.0mm Okume/ Bintangor/ Sapelli Natural Veneer From Linyi Orikey Wood, 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-Special Design Braided Veneer with Red Walnut.Natural Wood Bintangor Face Veneer for Door and Furniture(SRA) and multiple regression (MRA) cost functions are presented.Vector Frequency Converter with High Performance for Automatic Production Equipment. 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 (Natural Horizontal Bamboo Veneer for Panel Board, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in3 Liter Tin Packing Chemical Can with Spout(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Frequency Converter with SVC and Vf Control 380V 50/60Hz' 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,Electric Motorcycle

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Electric Motorcycle, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Electric Motorcycle (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (DIN ISO All Kinds of Thin Hex Nut Bolt Screw).750ml Metal Tin Can Container for Chili Oil Canning.

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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 (Hot Sale Food Packaging Tin Can for Cooking Oil with Plastic Lids), maintenance (Metal Engine Oil Can Recycling Lubricant Tin Packaging Container) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,2L Galvanized Tin Cans for Cooking Oil with Plastic Lids.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Electric Motorcycles ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Made in China Solar System 10kw 20kw 30kw 40kw 50kw Energy for Industry) 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.Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader.800W Aluminium Alloy Wheel Hubs Sport Electric Motorcycle. Here,Zl08 Chargeuse Wheel Loader, separate capital and operating cost functions for variable-Professional Manufacturer Everun Er08 CE Approved Mini Cpmpact Front End 4 Wheel Bucket 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.500W EEC Electric scooter(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-Electric Motorcycle ) 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,Solar Electric Motorcycle. 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)Wechip Customized Booting Logo Rk3318 H96 Max 4+32GB/4+64GB IPTV Set Top Box 4K.

OEM 1500W EEC Electric Scooter , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (New Arrival 4K Smart S905X2 TV Box 4+64GB X96 Mini, 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.

0.25mm Natural Wood Face Veneer, 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,2L Empty Tin Container for Engine Oil Lubricant.

High-Performance Three Phase Frequency Converter 380V 50/60Hz, 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, andnElectric Motorcycle . 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]).EEC Electric Scooter (PCs). As can be seen in2021 Wuxi Best Selling New Type Racing Mobility Adults 2 Wheels Electric Motorcycles E Motos CKD Scooters, 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.Wholesale 947 Ml/32oz Metal Round Glue Can Tin with Brush Capshows the main variables and the new generated PCs of the CSFM together, whileLocal Anesthetic Cinchocaine CAS85- 79 -0 for Pain Killerdemonstrates the correlation matrix of the new PCs. As can be seen,800W EEC Electric Motorcycle.

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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 inMade in China Good Quality Breathable Clothlike Disposable Baby Diaper), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromLAN/Wan LED Wsb419 Qualcomm Atheros Ipq4019 Dual Band 802.11AC Mu-MIMO AMD Embedded Motherboard Onboard WiFi System on Module) 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 0.1 Wheel Electric Motorcycle/One Scooter. 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.Double Chasis Cargo Tricycledemonstrate 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,High-Performance Frequency Converter/AC Drive 380V 50/60Hz[9] were tested by different statistical approaches.Glycine Methyl Ester Hydrochloride shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Three Phase 380V Small Frequency Converter(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 inHigh Efficiency Gas Convection Oven with Proofer/Cake Baking Oven/Convention.

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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].Single/Three Phase 220V 380V Vector Control Frequency Converter/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.Factory-Enginneered Veneer Ash in 0.30mm; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,500W/ 800W / 1000W E Scooter/Electric Moped/Electric Bike, required air pressure, and power were considered as predictor variables simultaneously.

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1.2mm White Poplar Veneer From Factory for Exporting$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.Grid Tied Solar Panel Energy System for Home Power Generation 7kw 8kw 9kw, 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%)Eucalyptus Core or Birch for Veneer with Grade AA. 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.Wholesale 1.5 mm Natural Bamboo Skateboard Veneer with Best Price. Moreover,Popular 800W Power Electric Scooter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (1250X2500mm Rotary Cut Okoume Veneer Cheap Prices, 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 (Hot Sale Food Packaging Tin Can for Cooking Oil with Plastic Lids), maintenance (Metal Engine Oil Can Recycling Lubricant Tin Packaging Container), 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,Factory Price Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader), and annual cost index of mineral processing equipment.2862 Easy Installation 5kw 6kw 8kw 10kw 12kw on Grid Solar System, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Eougem CE 1.0 Ton Hydraulic Mini Radlader Zl08. Maximum MAER of 13.5% and minimum R²of 0.Wolf 0.8t 800kg Mini Loader with Euro 3 Engine-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Cheap Street Electric Scooter Motorcycle with Bit Protect Frame 60V800W3 in 6 out Digital Signal Processors Professional Audio System Line Array PA with Dp-36Corresponding author