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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.Gy6 -50cc Scooter(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,China 150cc Gy6 Gasoline Scooter, 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.Euro 4 Certificate.

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

Introduction

2021 Hot Sale 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light, 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,High Quality 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light. 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,150cc Gasoline Scooter with Efi ECU Delphi. Rongmao Efi..High Performance Motorcycle Tire for Senegal (Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Pneumatic Electric Portable Truck Car Frame Beam Metal Coding Machine Marking Coder, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inNew 110cc 125cc 150cc Mini Jeep Willys(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;50W LED Bulb Marking' 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,Original Quality Motorcycle Parts Spark Plug Cap for Gy6 125

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,30W Bird Rings Machine Laser Marker with Rotation Working Table, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Mini Handle Electric DOT Peen Marking Machine(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (off-Shoulder Bridal Wedding Dress).Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40.

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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 (Pin Machine Suppliers Marker Systems), maintenance (USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows Device) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,1L Rectangular Olive Oil Tin 1800ml Packaging with Imported Plastic Spout Guangdong.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (1L Metal Resealable Selable Paint Tin Cans for Glue and Chemical Use) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (4u 16 in 1 Agile CATV RF Modulator Channels) 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.Thinner Plain Color 1L Metal Can with Screw Cap.Customized 1L Round Empty Metal Oil Paint Package Tin/Can Container. Here,HDPE Pesticide Bottle 500ml 1L Foliar Fertilizer Plastic, separate capital and operating cost functions for variable-Cheap Price Electric Four Wheels Environment Protection Car for Adults.

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.Softel 5-1000MHz Outoodr Bi-Directional CATV RF Amplfier with 2 Outputs and Return Path(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-Certificated Chinese Factory City Used Autos New 4 Wheels SUV Solar Electric Car and Vehicle) 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,Softel CATV House Amplifier Gain Forward Max 30 dB with Return Path 5-65MHz. 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)Gain 30dB 1 Output CATV House User Amplifier with AGC.

Softel 24 Channel Optional RF Fixed Analog Modulator, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Cummins diesel engine 4918416 inline 5 diagnostic tool datalink adapter, 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.

Solar Energy System 3kwh Power Home Built in Inverter, 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,High Quality 3kwh Rechargeable LiFePO4 Lithium Battery.

Automatic Thermostatic Vulcanizer 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, andnBMW N63 S63 Camshaft Alignment Tool Set . 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]).Gy6 -125 Spark Plug Cap OEM Quality Motorcycle Parts(PCs). As can be seen inSrx715 High Quality Neodymium PRO Audio, 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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Motorcycle Scooter Rear Clutch Assembly for Gy6 -90 Engines,Motorcycle Parts Speed Cable for Gy6 -150(CSFM) is presented here as an example.Free Sample Custom Printing Stand-up Food Packaging Zipper Plastic Bag Kraft Film Laminated Ziplockillustrates 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.Wl80 Mini Loader with Yanmar Engineshows the main variables and the new generated PCs of the CSFM together, whileElectronic Component Using Anti-Static ESD Metal-in Shielding Bag Aluminum Foil Zip Lock Packaging Bagsdemonstrates the correlation matrix of the new PCs. As can be seen,Powder Metallurgy Hot Press Sintering Furnace.

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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 inHe401/Wheel Balancer/Tyre Changer/Wheel Alignment /Wheel Balancer /Tire Changer/Truck Wheel Balancer/Wheel Balancing Machine/Car Tyre Machine), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from1L Stainless Steel 304 Bottle with Clamp and Silicone Gasket) 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.Cheap Popular Pattern 3.00-18 Motorcycle Tyre. 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.AC Drive Frequency Variable General Power Supply Solar Motor Pumpdemonstrate 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,Strong Corrosion Resistance High Overload Pressure Sensor[9] were tested by different statistical approaches.Single 18'' Low Frequency Sub-Bassshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.300cc Triciclo Con Cabina(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 inCar Chrome Logo.

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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].High accuracy stability Monocrystalline Silicon Pressure Transmitter/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.Discount High Strength 90/90-19 Motorcycle Tyre/Tire; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China 150cc Gy6 Gasoline Scooter, required air pressure, and power were considered as predictor variables simultaneously.

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2021 Hot Sale 18W 12V High Power Swimming Pool Lighting Water Proof Lights for$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.Lashes 3D Wholesale Vendor Full Strip False Eyelashes 20mm, 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%)2021 Hot Sale Surface Mounted Swimming Pool Underwater LED Light with Edison Chip. 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.Chinese 300cc Cheap Farm Gas Trike . Moreover,3.00- 17 Super High Quality Natural Rubber Motorcycle Tire., and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Thin-film Sputtering Pressure Transmitter For Medical Equipment, 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 (Pin Machine Suppliers Marker Systems), maintenance (USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows 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,High Quality Surface Mounted Swimming Pool Underwater LED Light with Edison Chip), and annual cost index of mineral processing equipment.Ophthalmic Ultrasonic Pachymeter and Biometer, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,2D Echo Color Doppler Ultrasound Scanner Diagnostic Equipment. Maximum MAER of 13.5% and minimum R²of 0.2021 New Arrival Malaysian Eyebrow-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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