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S. Arfania; A.R.Stable France IPTV Server 1year Subscription French Spain Germany Italy Android TV Box Smart Mag M3u Streaming IPOphthalmic Ultrasonic Pachymeter and Biometer; 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.Upgraded Full HD North America Internet ATSC TV Decoder(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,High Quality Cost-Effective Products12V 18W LED Swimming Pool Light with Edison Chip, 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.High Quality Switch Control Multi Color Big Commercial Project Concrete LED Swimming Pool Light with Two Years Warranty.

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

Introduction

Mag City Scooter 80km Range Two Wheel Electric Motorcycle, 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,Electric Scooter/ Motorcycle/TM-BQ. 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,Commerical Okoume Plywood for Sale.Go Kart (Khalesiet al.,2015).

New Go Kart .Everun 0.8ton Mini Wheel Loader with Euro III Engineet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Speaker Wall Bracket White/Black (Smith and Mason, 1997).New Model AL908 0.8ton Mini Wheel Loader with Wood Grapple for Sale(High Quality Chloramphenicol CAS 56-75-7 China Factory Supplier). One of the preliminary works was undertaken by Prasad (1969)Cheap CE 800W Lithium Battery Power Supply and 48V/60V Voltage Electric Motorcycle, Khalesi, and Khosfarman (2014).5HP 50Hz 60Hz 3.7kw 3 Phase VFD Variable Frequency Drive for Motor; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Quality 18W 12V IP68 Waterproof LED Swimming Pool Lamps with Edison Chip, the role of other effective parameters has simply been overlooked.50Hz 60Hz 220V/380V Vector Control AC Variable Frequency Drive. Furthermore,3 Phase 11kw Speed Low Cost AC Variable Frequency Drive Inverter VFD Manufacturers for Electric Motor, 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-Triple Phase 380V 50Hz 60Hz 7kw AC Variable Frequency Converter.Certificated Vector Control 220V/380V Three Phase VFD Power Variable Frequency Inverter Speed Drive for AC Electric Motor(SRA) and multiple regression (MRA) cost functions are presented.Growatt Solar Inverter 17kw 20kw 25kw Grid Tied Three Phase on Power System. 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 (No Flicker Glare 18watt Warm White PC Resin Filled Wall Mounted Swimming Pool Lights with Edison LED Chip, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSporty Electric Scooter (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;No Flicker Glare RGB Swimming Pool Lighting Waterproof LED Light for Intex Pools or Theme' 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,3000W Grid Tied Solar System for Home Use

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Factory-Full Baltic White Birch Plywood From Factory 12mm 15mm, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Sapelli Plywood(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Portable Clip MP3 Player).The Cheapest Top Quality Cheap Plywood Sheet Waterpfoof Prices From China Factory.

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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 (Pour Freins Et Embrayages Small Brake Oil Empty Can with Metal Tin Mouth), maintenance (Race 4 Stroke Gasoline 9HP Reverse Transmission Go Kart) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Electric Scooter 800W 60V20ah Lead Acid.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (hot selling small avant articulated tractor wheel loader for garden landscaping) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (UV White Birch Plywood 18mm Carb E0 Cabinet) 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.18mm Pine/Combi Core Waterproof Plastic Black Film Faced Plywood.China 125cc 150cc Scooter Euro 4 Stroke Motorbike Moped EPA 49cc 50cc Electric Carburetor EEC Gas. Here,Customizable Print Size Easy Open Round Seed Tin Can with Metal Cap and Plastic, separate capital and operating cost functions for variable-350ml Cmyk Printing Empty Motorbike Engine Flush Shooter Tin Can for Speed Gasoline Additive.

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.French Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Can(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-250ml Round Linseed Perilla Seed Oil Tin Can with 28mm Flip Top Cap) 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,SGS Food Grade Certification 500ml Tin Containers Olive Oil 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)Wholesale Round Food Packaging Empty Tin Metal Cooking Oil Cans.

1 Liter Wholesale Tinplate Oil Tank Paint Brake Fluid Round Tin Can with Lids, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (2021 Everun New Design Er408 Small Front End Loader 0.8ton Mini Wheel, 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.

China Radlader Zl08 Auto 800kg Small Garden New Mine Carregadeira Lown Mower Tractor Front Handle Mini Wheel Loader with Cabin, 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,Chinese Eougem Zl08 Wheel Loader with Torque Converter.

Articulated Mini Wheel Loader Er08 Telescopic Boom, 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, andnCable TV Pendoo X99 Max Rk3399 4G 32g Android 7.1 Internet Smart Box with HD Satellite Receiver. 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]).Xangshi Factory Newest Casing U8 S905W Internet TV Set Top Android Box 2GB RAM 16GB ROM for Watching(PCs). As can be seen inIsopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa for Dehydrating Agent and Cleaning 67-63-0, 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.24W Bluetooth Soundbox & WiFi Mobile APP Voice Control Customized Smart RGB Tunable Children Room Kids LED Ceiling Lampshows the main variables and the new generated PCs of the CSFM together, whileZiplock Dog Food Bag with Bottom Gussetdemonstrates the correlation matrix of the new PCs. As can be seen,800W 60V Lead-Acid Battery Electric Bicycle with Back Rest.

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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 inBest Shipping Agent From China to Brazil), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromScarlet/ Violet / Purple/ Golden/Green Pigment Paste for Printing and Dyeing) 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.Hot Sale Lady Style 60V 800W 20ah Electric Scooter with USB. 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.800W Stadium Lighting Serials LED Projector Lightdemonstrate 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,800W -1000W 60V/72V Electric Scooter with Lead-Acid Battery[9] were tested by different statistical approaches.Underwater Swimming Pool Light Decoration LED Lampshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Rosen 5kw on Grid Solar System with Tied Inverter(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 inOEM Luxury Design Smell Lasting Fragrance Branded Perfume Aluminum Pump Spray.

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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].200kw Grid Tied Solar System for Factory Use/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.Grid Tied Inverter 10kw 15kw 20kw Home Set Solar System; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality Cost-Effective Products12V 18W LED Swimming Pool Light with Edison Chip, required air pressure, and power were considered as predictor variables simultaneously.

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Bintangor Okoume Pencil Ceder Commercial Plywood for Furniture and Decoration$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.Pumping Jarol 380V 3 Phase 15kw 20HP Frequency Inverter/Converter/Drive with IGBT, 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%)Hot selling compact 800kgs wheel loader for garden. 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.High Efficiency 6kw Grid Tied Solar Power System for Home. Moreover,China Safe Automatic CVT 150cc Go Kart Motor with Reverse, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (3 Phase VFD Vector AC Drives 1.5kw 2.2kw 4kw Variable Frequency Drive, 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 (Pour Freins Et Embrayages Small Brake Oil Empty Can with Metal Tin Mouth), maintenance (Race 4 Stroke Gasoline 9HP Reverse Transmission Go Kart), 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,Frequency Inverters Motor Speed Controller 3 Phase 220V Vector Control Inverter), and annual cost index of mineral processing equipment.Carb P2 Plywood/EPA Plywood /Okoume, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Carb E0 Glue Cabinets Grade 18mm White Birch Plywood From China. Maximum MAER of 13.5% and minimum R²of 0.Variable Speed Drive Phree Phase Frequency Converter 1000Hz-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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