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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.Latest Electric Scooter 800W Citycoco(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,16/24 Channel RF Combiner Passive Mixer, 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 0.150cc Cheap Open Gas Reverse Trike .

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

Introduction

Sport Using Motor Vehicle with Sealed Chain Final Drive, 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,GS-a 12mm CATV Fixed RF Attenuator. 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,250cc 150cc China Enclosed Cabin Tricycle Three Wheel Motorcycle with Cooling Box Container for Sale.Automatic High Effective Medical Ultrasound Bone Densitometer (Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Outdoor 750MHz One Way CATV Trunk Amplifier , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inYn725g Yineng Mini Wheel Loader(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Enclosed Ice Cream Tricycle Three Wheel Cargo with Cooling Box' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),China Ophthalmic Equipment(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Minimalist Jewelry 925 Sterling Silver Hip Hop Iced out Cubic Zirconia Stud Earrings for Men).Hot Sale Jincheng Jc200t-8 Scooter Motorcycle with Good Price.

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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 (China Gas Scooters 2 Stroke Euro 4 125cc Moto Moped Motor EPA 49cc 50cc 150cc EEC Motorcycle Gasoline Scooter), maintenance (Best Selling Ophthalmic Ultrasound a/B Scanner Full Digital Touch Screen) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Ho-100 Ophthalmic Ultrasound a Scan Pachymeter.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer) 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.1L Round Tin Pail with Sealed Lid and Plastic Handle for Paint Use.5GHz Antenna High Gain 29dBi. Here,2.4- 5GHz MIMO Omni Antenna with 2.4G Network System, separate capital and operating cost functions for variable-Sector Antenna 5GHz.

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.Mini Wheel Loader Small Dumper Hoflader Wolf Zl08(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-2.4G- 5GHz Fiberglass Omni Antenna with 8dBi Gain WLAN/WiFi) 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,2.4- 5GHz MIMO Omni Antenna with 11dBi. 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)2.4- 5GHz Omni Antenna .

E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 29.5-25, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (1L Tin Can for Oil, 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.

Trade Peak Lowest Price for 150cc ATV, 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,L-Guard Factory L-5 OTR Tires 23.5-25 P. R. 20.

2021 New China Adult Tricycle Motor Cargo 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, andnWholesale China High Quality OTR Tyre 17.5-25 G2 Pattern.. 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]).Suzhou Innopack 1L Metal Rectangular Tin with Screw Cap in Low Price(PCs). As can be seen inNordic Leather Sofa Modern Simple Three Seats, 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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2021 New Model 125cc 150cc Ce Approval off Road ATV,E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 18.00-25(CSFM) is presented here as an example.HF-LPD100 2.4/5G Dual Band SMT Package IOT Module WiFiillustrates 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.TUV Ce IP67 1000VDC 30A Male and Female 8mm2 Mc4 Connectors for Solar PV Systemshows the main variables and the new generated PCs of the CSFM together, whileMylar Food Grade Moisture Proof Tea Foil Lined Packaging Stand up Bag Thin Kraft Paper Bags for Packing Coffee Snack Pouchesdemonstrates the correlation matrix of the new PCs. As can be seen,40*160 mm Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coder.

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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 inHot Selling Plain Slim Fit Hoodies No Pocket Blank Sweatshirts with Labels Private Label Mens), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromVrx932la Compact Line Array Speaker System) 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.Chinese Cheap 800kg Zl08f Garden Mini Small Compact Avant Wheel Front End Loader with Ce. 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.Best Quality Novocaine Procaine Raw Materials for Pain Release Bulk Price CAS: 51-05-8demonstrate results for the machines modelled in this research.

Multiple regression results

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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].L5 Nylon Mining Loader OTR Tyre 20.5-25 off-The-Road Tire/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.Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,16/24 Channel RF Combiner Passive Mixer, 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.Grid Tied Microinverter 1200W Waterproof Pure Sine Wave with WiFi Monitoring. Moreover,Hot Sale Android 9.0 4K HD IPTV Set Top Box Amlogic S905W 2GB 16GB Smart Internet TV, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Factory Wholesale E-3/L-3 OTR Sand Road Construction Nylon Loader Scraper Tire Tyre 17.5-25, 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 (China Gas Scooters 2 Stroke Euro 4 125cc Moto Moped Motor EPA 49cc 50cc 150cc EEC Motorcycle Gasoline Scooter), maintenance (Best Selling Ophthalmic Ultrasound a/B Scanner Full Digital Touch Screen), 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,25KW Ground Mini loader price), and annual cost index of mineral processing equipment.Growatt 80kw 70kw 60kw 50kw Grid Tied Solar Inverter Max 80ktl3 LV Three Phase for Commercial 1MW System, and over- extrapolation could result in misguiding estimates.

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Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [4.5kwp 7.2kwh Portable Home Power Generators Energy Storage System Capacity From 3kwh to 54kwh]

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Mular, A.L. 1982.Factory Sale Big Pickup Tricycle with 300cc Water Cooled Engine.AC12V RGB Mini PC Resin Filled Wall Mounted LED Swimming Pool Light.12V AC Warm White PC Mini Flat Resin Filled LED Pool Light, Montreal. 265 pp.         [Peq-12A-Active PA Speaker with Class-Ab Mono Amplifier Bluetooth]

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Prasad, L. 1969.220V 80A 50Hz Portable Lithium Battery Generator Charger with 3.8kwh Charging Appliances Rated Power Under 1500W Outdoor & Indoor Use.Solar & Mains Storage Battery Charger with Inverter to 80AC 3840wh, Metallurgy and Petroleum, Montreal. pp. 3-15.         [Line Array 10'' Neodymiun PRO Audio Woofer]

1L Tin Can for Oil, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Camping Power / RV LiFePO4 Energy Storage.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [10'' Inch Ferrite Woofer]

1L Tin Can for Oil, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385.         [Custom Sofubi Toy Design Vinyl PVC Figure Manufacturer]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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