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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.Mimo Antenna 5150MHz~5850MHz WiFi Panel(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,5GHz 20dBi Panel WiFi Antenna, 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.Fast Ship 800W 1000W 1200W 60V 72V 20ah Battery Electric Motorcycle From China.

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

Introduction

Hot Sale 2.4/ 5GHz 9dBi Rubber WiFi Antenna, 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,5GHz 12dBi Dual Polarity MIMO Omni Antenna. 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,Electric Motorcycle Fashion Design 800W with Removable Battery.5GHz 18dBi Dual Polarization Panel WLAN Antenna(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Finished Surface HD Truck Wheel 17.5inch Rims Steel, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inProfessional Loudspeaker Line Array PRO Audio(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;250CC Go Kart ' 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,High Quality 18mm Carb Birch Okoumen Plywood

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,1.5kw 220V Frequency Converter Single Phase 380 3, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Carb Approved Birch Plywood(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (32"U Type Back Light TV Samsung 9 LED Bar).Carb E0 Cabinet Grade 18mm Plywood in High Quality.

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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 (1.5kw 220V Frequency Inverter Brands AC Drive for Electric Motor), maintenance (hot selling tractor front end wheel pallet fork loader for argricultural) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Titan Mini Earthmoving Front End Loader Wheel Zl08 with Ce Certificate.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Carb Bleach White Poplar Plywood LVL 12mm 18mm) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Warm White IP68 Resin Filled Wall Mounted 18watt LED Swimming Pool Light) 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.Wolf Loader Wl80 Zl08 Radlader Mini Wheel.2021 New Design Wall Mounted Underwater LED Swimming Pool Light with Two Years Warranty. Here,High Quality Carb Certified Birch Faced Furniture Plywood, separate capital and operating cost functions for variable-UV Birch Plywood with Poplar Core Carb E0 Glue From Factory.

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.17 Inch 18 Aftermarket New Design Aluminum Car Alloy Rim(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-China Wolf Wl80 Articulated Mini Loader) 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,Digital ATSC Receiver Internet TV Set Top Box. 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)Vimode Buy 2021 Newest 48V Electric Motorcycles Made in China 800W.

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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.

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whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,5GHz 19dBi Enclosure WLAN Antenna.

16 17 18 Inch Vossen CV5 Alloy Wheel, 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, andnVFD Air Compressor Asynchronous Variable Frequency Drive. 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]).Tubeless Steel Wheel (PCs). As can be seen inHigh Quality Nootropics Noopept CAS 157115-85-0 Best Price, 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.PVC Pipe Extrusion Machine Line/UPVC Production Line/Plastic PVC/UPVC/CPVC Electricity Conduit Tube/ Water Sewage& Pressure Supply Lineshows the main variables and the new generated PCs of the CSFM together, while2021 New Model 125cc 150cc Ce Approval off Road ATVdemonstrates the correlation matrix of the new PCs. As can be seen,5GHz Antenna High Gain 32dBi.

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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 inFactory Price Dimmable 10W 220V Cool Warm Light LED Lighting Bulb), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromOEM Metallized Stand up Zipper Toys Plastic Rice Meat Container Custom Printed Zip Lock Pouch Food Packaging Mylar Exit Gift Bag) 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 0.32dBi 5GHz WLAN Antenna. 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.Carb P2 AA/Bb Grade Birch/Okoume/Bintangor/Poplar Plywooddemonstrate 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,Brown Black Opaque Chemical Industrial Container 100ml Flip Top Cap Bottle[9] were tested by different statistical approaches.Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Quality Waterproof 18W PAR56 RGB 12V LED Swimmiong Pool Light with Two Years Warranty(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 inCalcatta Polished Surfaces Engineered Quartz Stone. Slab with NSF SGS Certification..

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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].2.5A 0.4kw IP20 Jarol Variable Frequency Drive/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.No Flicker Glare Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Edison Chip; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,5GHz 20dBi Panel WiFi Antenna, required air pressure, and power were considered as predictor variables simultaneously.

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2021 New Design Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Two Years Warranty$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.New Electric Beatiful on Road 800W Scooter E-Motorcycle, 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%)5GHz 15dBi Dual Polarization Enclosure WiFi Antenna. 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.Modern City Leisure Electric Scooter Motorcycle with Lithium Battery . Moreover,White Truck Wheel 17.5X6.00 Steel Rims, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (7.5kw MPPT with High Efficiency Solar Water Pump Controller, 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 (1.5kw 220V Frequency Inverter Brands AC Drive for Electric Motor), maintenance (hot selling tractor front end wheel pallet fork loader for argricultural), 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,Carb P2 AA/Bb Grade Birch/Okoume/Bintangor/Poplar Plywood), and annual cost index of mineral processing equipment.AC Variable Frequency Drive Single Phase, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,17.5X6.75 Heavy Duty Truck Trailer Steel Wheel Rim. Maximum MAER of 13.5% and minimum R²of 0.Triple Phase Variable Frequency Inverter AC Drive-feasibility and even feasibility study level of projects.

References

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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