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S. Arfania; A.R.Best Selling Ophthalmic Ultrasound a/B Scanner Full Digital Touch Screen125cc Scooter EEC Popular Motor Alex; 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.Ho-100 Ophthalmic Ultrasound a Scan Pachymeter(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,Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler, 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.Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer.

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

Introduction

1L Round Tin Pail with Sealed Lid and Plastic Handle for Paint Use, 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 Antenna High Gain 29dBi. 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,2.4- 5GHz MIMO Omni Antenna with 2.4G Network System.Sector Antenna 5GHz(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Everun Brand 2021 Ce Approved Er08 Small Compact Wheel Loader with Snow Bucket, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDC 1000V Mc4 Cable Connectors (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;2021 New Model 125cc 150cc Ce Approval off Road ATV' 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,OTR Heavy Loader Tyre L5 20.5-25 Size Best Price

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Mars Solar 30kw Power System on Grid Tied Micro Sine Wave Inverter, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),1167 Single Phase 3 110V/220V/380vgrid- Tied Inverter for Residential or Commercial Application 3kw-80kw(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (One Person Soaking Bathtub for Denmark Markets).L5 Nylon Mining Loader OTR Tyre 20.5-25 off-The-Road Tire.

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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 (Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood), maintenance (Lithium Polymer Battery Mica 3.7V Mc602540 550mAh Li Pack for Electronic Device) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,New Model High Quality 4 Stroke LED Efi 50cc 100cc 110cc Gasoline Scooter Gas Moped Super Soco Bike Mini.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Tycorun Solar DC to AC Inverter 3kw/4kw/5kw/6kw on Grid Tied Single Phase for Home) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (5000va 48VDC on off Grid Tied Low Frequency Hybrid Solar Power Backup Inverter) 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.Eougem Mini 0.8 Ton Front End Loader of Good Quality 25kw.Grid Tied Microinverter 1200W Waterproof Pure Sine Wave with WiFi Monitoring. Here,Hot Sale Android 9.0 4K HD IPTV Set Top Box Amlogic S905W 2GB 16GB Smart Internet TV, separate capital and operating cost functions for variable-Factory Wholesale E-3/L-3 OTR Sand Road Construction Nylon Loader Scraper Tire Tyre 17.5-25.

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.25KW Ground Mini loader price(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-Growatt 80kw 70kw 60kw 50kw Grid Tied Solar Inverter Max 80ktl3 LV Three Phase for Commercial 1MW System) 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,Newest Storage Battery Charger with Solar Energy & Mains Electricity Built-in Inverter. 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)Yn725 Yineng Mini Wheel Loader 25kw.

No Flicker Glare High Purity 18W Underwater LED Swimming Pool Light with Edison Chip, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Yn725 Wheel Loader 25kw 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.

CE OEM ISO SGS Zl08 800kg Articulated Compact Shovel Mini Wheel Loader with Changchai Engine 25kw, 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,2.4- 5GHz MIMO Omni Antenna.

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whereC_eis the estimated cost,C_athe actual cost, andnoff Grid Tied Solar Inverter 10kw 15kw 20kw 30kw 50kw 100kw 200kw 500kw 3phase. 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]).12V DC/AC 18W/24/30W/40W/55W Resin Filled PAR56 Wall Mounted Swimming Pool Light with 2 Years Warranty(PCs). As can be seen inPA System Single 18" Sub Bass Speaker Low Pitch Subwoofer with Wa118, 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.100% CAS 79 -57-2 Oxytetracycline Powdershows the main variables and the new generated PCs of the CSFM together, whileWolf Wl80 Mini Radlader Hoflader with Forks in Farmdemonstrates the correlation matrix of the new PCs. As can be seen,AC12V RGB Mini PC Resin Filled Wall Mounted LED Swimming Pool Light.

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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 in100ml 30ml 50ml White Color as Plastic Airless Acrylic Bottle for Cosmetics Packaging), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from4.5kwp 7.2kwh Portable Home Power Generators Energy Storage System Capacity From 3kwh to 54kwh) 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.Medical Equipment Portable Automatic High Effective Ultrasound Bone Densitometer. 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.SP-KS410) Customized Fabric Softwood Frame Sofademonstrate 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,No Flicker Glare 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with Edison Chip[9] were tested by different statistical approaches.in Line Multy-Cylinder Diesel Engine for Power Generator Setshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.220V 80A 50Hz Portable Lithium Battery Generator Charger with 3.8kwh for Appliances Rated Power Under 1500W Outdoor & Indoor Use(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 in2000W/3000W Pipes Plates Fiber Laser Cutting Machine.

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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].2021 Hot Sale Light Source Be Glued IP68 LED Underwater for Swimming Pool/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.4GB32GB 4K Android TV Box Digital Display T95X2 with Amlogic S905X2 Internet Quad Core CPU Media; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler, required air pressure, and power were considered as predictor variables simultaneously.

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220V 80A 50Hz Portable Lithium Battery Generator Charger with 3.8kwh Charging Appliances Rated Power Under 1500W Outdoor & Indoor Use$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.Solar & Mains Storage Battery Charger with Inverter to 80AC 3840wh, 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%)Camping Power / RV LiFePO4 Energy Storage. 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.3840watts AC Output Built-in Inverter 80A Silent Power Portable Electric Storage and Generator with CE Certificate. Moreover,Flying Online Fiber Laser Marking Machine with Conveyor Belt, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (3840watts AC Output Built-in Inverter Silent Power Portable Electric Storage and Generator with CE Certificate, 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 (Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood), maintenance (Lithium Polymer Battery Mica 3.7V Mc602540 550mAh Li Pack for Electronic Device), 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,Camping Power / RV LiFePO4 Energy Storage Portable Generator 3840wh 80A 220V Enjoys 2 Years Warranty), and annual cost index of mineral processing equipment.Fiber Laser Marking Color Printing Machine Price 30W 50W 100W Mopa, and over- extrapolation could result in misguiding estimates.

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Yn725 Wheel Loader 25kw Mini, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-2021 Best Sale 150cc Adults 4 Wheeler Petrol Power Racing Quad.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [HPM410W Submerged Integrated Level Sensor Transmitter]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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