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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.Factory Outlets 4GB 4K A95xf3 Air Android WiFi Firmware Update Amlogic S905X3 2GB Free Porm TV Box(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,New Product T95 Max+ S905X3 World 9.0 6K 4G Lte Download User Manual for Max 4K Smart Android Box 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.Food Grade 280ml Empty Tin Can for Camellia Oil.

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

Introduction

800W Fashion Power Motorcycle Cheap Electric, 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,Rectangular Glue Tin Can Empty Clear Paint. 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,Metal Tinplate Container Engine Oil Can with Screw Cap.Square Tin Paint Packaging Can Lubricant Oil Containers(Khalesiet al.,2015).

800W Electric Scooter/Motorcycle with LED Light.Citycoco Electric Motorcycle E6 Cheap OEM E Bikeet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Engine Controller Model Eim Basic 258 -9756(Smith and Mason, 1997).800W Deft Fresh Type Drum Brake Brushless Motor Electric Motorcycle(Wholesales Plastic Food Packaging Weed Mylar Bag Aluminum Foil Resemble Ziplock Pouch Rice). One of the preliminary works was undertaken by Prasad (1969)Euro5, Khalesi, and Khosfarman (2014).Retro Scooters; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,2856 3kVA/5kVA/8kVA/10kVA/12kVA Solar on-Grid Power System for Home/Office/Farm/Hotel, the role of other effective parameters has simply been overlooked.HK1 S905W 2g 16g 7.1 Android TV Box of New Product Set Top with Low Price Kd Player 17.0. Furthermore,Popular 800W Strong Power Electric Scooter Bike/ Classic Vespa Scooter/Electric Motorcycle, 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-72V20ah Battery 800W Motor 60km Distance Range Electric Motorcycle.800W Power and 60kms Range Per Charge Cheap Electric Motorcycle/Escooter(SRA) and multiple regression (MRA) cost functions are presented.Frequency Converter Special for Driving Asynchronous Motors 380V 50/60Hz. 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 (Multi Birch Veneer Plywood Manufacturer, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in12V AC Warm White PC Mini Flat Resin Filled LED Pool Light(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Empty Round Tin Can Paint Package Container' 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,China Titanhi Zl08 800kg Compact Agricultural 0.8t Micro Pay Loader 4WD

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Compact structure mini loader/wheel loader/ with 0.8ton bucket for building construction, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),CE Approved Wolf 0.8ton Bulldozer Mini Loader with Bucket(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Brooch).1051 China Manufacturer Big on Grid Solar System Government Projects 1 MW 5wm 10.

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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 (800W Sine Wave Water-Proof Controller Electric Scooter/Electric Motorcycle), maintenance (Metal Tin Can Engine Oil Empty Tinplate Container) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Rosen 35kw Grid Tied on Solar System to Global Market.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (800W High Speed Electric Scooter/Bike) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (800W 60V20ah Brushless Electric Motorcycles) 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.10L Customized Tin Cans Paint Coating Used Metal Square Can.500W/ 800W / 1000W E Scooter/Electric Moped/Electric Bike. Here,Square Engine Oil Can Metal Paint Tin Container with Plastic Lid, separate capital and operating cost functions for variable-800W Fashion Style High Speed Long Range Cheap Adult Electric Motorcycle for Sale.

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.Cheap Small Electric Scooter Moped 800W Motorcycle(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-Frequency Converter for Small Power Motors 3pH 380V 50/60Hz) 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,Manufacturer of Rectangular Brake Oil Motor Engine Tin Can. 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)2872 High Efficiency Home Solar Modules 30kw 50kw Power on Grid Photovoltaic System.

Automobile Paint Can 5L Square Tin with Metal Cap for Ink Oil, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (866 5kw on Grid Solar System with Power Inverter for Home, 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.

Food Grade Metal Tin Can with Printing Logo for Cooking Oil, 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,Good-Tightness Square Tin Can Metal Engine Oil with Sscrew Lid.

800W Electric Scooter , 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, andnGood-Sealing Square Tin Can Engine Oil with Metal Lid. 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]).0.15mm-1.0mm Okume/ Bintangor/ Sapelli Natural Veneer From Linyi Orikey Wood(PCs). As can be seen inWholesales Hairdressing College 100% Real Natural Hair Practice Mannequin Training Head for Hairdresser, 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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Natural Wood Bintangor Face Veneer for Door and Furniture,Vector Frequency Converter with High Performance for Automatic Production Equipment(CSFM) is presented here as an example.Hot Sell 800W Delivery City Electric Scooter for Take-out Businessillustrates 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.Single 10 Inches Passive/Active Full-Range Professional Loudspeakershows the main variables and the new generated PCs of the CSFM together, whileInsecticide Deltamethrin 2.5% Ecdemonstrates the correlation matrix of the new PCs. As can be seen,Natural Horizontal Bamboo Veneer for Panel Board.

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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 inBiggest Forwarder for Belgium Shipment), 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.Electric Motorcycle . 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.Mx Series Analog Audio Mixer with EQ and DSP Mx-18fx for Professional Usedemonstrate 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 Three Phase 380V 50/60Hz[9] were tested by different statistical approaches.Customized Windows or Android Sunlight Readable Waterproof All Weather HDMI Touchscreen Monitor Ad LCD Display Digital Signage Kioskshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.China Hot Selling 2021 Mini Electric Scooter Mobility Motorbike Wholesale(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 in2021 New 100% Natural Eucalyptus Essential Oil 10ml Massage Aromatherapy.

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Cost model for variable-Electric Motorcycle

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].Electric Motorcycle /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.Electric Motorcycle; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,New Product T95 Max+ S905X3 World 9.0 6K 4G Lte Download User Manual for Max 4K Smart Android Box TV, required air pressure, and power were considered as predictor variables simultaneously.

Electric Motorcycle . Moreover, the operating cost was detailed in different cost items.750ml Metal Tin Can Container for Chili Oil Canning, indicated inGrid Tied 30kw Solar PV System for Shingle Roof, and major extrapolation should be avoided.

Hot Sale Food Packaging Tin Can for Cooking Oil with Plastic Lids$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.Metal Engine Oil Can Recycling Lubricant Tin Packaging Container, 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%)2L Galvanized Tin Cans for Cooking Oil with Plastic Lids. 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.Electric Motorcycles . Moreover,Made in China Solar System 10kw 20kw 30kw 40kw 50kw Energy for Industry, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader, 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 (800W Sine Wave Water-Proof Controller Electric Scooter/Electric Motorcycle), maintenance (Metal Tin Can Engine Oil Empty Tinplate 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,800W Aluminium Alloy Wheel Hubs Sport Electric Motorcycle), and annual cost index of mineral processing equipment.Zl08 Chargeuse Wheel Loader, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Professional Manufacturer Everun Er08 CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader. Maximum MAER of 13.5% and minimum R²of 0.500W EEC Electric scooter-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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