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S. Arfania; A.R.Hot Selling Electric Race Vietnam Motorcycle Tire City Scooter 800W Long Range Electric; 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.Gy6 150cc Gasoline 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,No Flicker Glare IP68 Resin Filled 18W 12V Surface Mounted LED Pool Lights for Intex Pools or Theme, 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.Gy6 -50cc Scooter.

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

Introduction

China 150cc Gy6 Gasoline Scooter, 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,Euro 4 Certificate. 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,2021 Hot Sale 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light.High Quality 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Ophthalmic Pachymeter , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAutomatic Thermostatic Vulcanizer for Sale (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;6A Grade Indian Beard' 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,WiFi Wireless Ultrasound Linear Color Doppler USB 192 Elements Probe

►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 Customized Automobile Automotive Vehicle Parts Electric Drive and Motor Shaft, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Original Quality Motorcycle Parts Spark Plug Cap for Gy6 125(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Shiny Polyester American Tulle Mesh Fabric).30W Bird Rings Machine Laser Marker with Rotation Working Table.

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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 (Mini Handle Electric DOT Peen Marking Machine), maintenance (Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Pin Machine Suppliers Marker Systems.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows Device) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (1L Rectangular Olive Oil Tin 1800ml Packaging with Imported Plastic Spout Guangdong) 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 Metal Resealable Selable Paint Tin Cans for Glue and Chemical Use.4u 16 in 1 Agile CATV RF Modulator Channels. Here,Thinner Plain Color 1L Metal Can with Screw Cap, separate capital and operating cost functions for variable-Customized 1L Round Empty Metal Oil Paint Package Tin/Can Container.

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.HDPE Pesticide Bottle 500ml 1L Foliar Fertilizer Plastic(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-Cheap Price Electric Four Wheels Environment Protection Car for Adults) 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 5-1000MHz Outoodr Bi-Directional CATV RF Amplfier with 2 Outputs and Return Path. 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)Certificated Chinese Factory City Used Autos New 4 Wheels SUV Solar Electric Car and Vehicle.

Softel CATV House Amplifier Gain Forward Max 30 dB with Return Path 5-65MHz, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Gain 30dB 1 Output CATV House User Amplifier with AGC, 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.

Softel 24 Channel Optional RF Fixed Analog Modulator, 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,Cummins diesel engine 4918416 inline 5 diagnostic tool datalink adapter.

Solar Energy System 3kwh Power Home Built in Inverter, 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, andnHigh Quality 3kwh Rechargeable LiFePO4 Lithium Battery. 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]).Automatic Thermostatic Vulcanizer for Sale (PCs). As can be seen inCustom Water Proof Child Resistant Food Grade Plastic Aluminum Laminated Stand up Container Bag, 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.Free Sample Custom Printing Stand-up Food Packaging Zipper Plastic Bag Kraft Film Laminated Ziplockshows the main variables and the new generated PCs of the CSFM together, whileWl80 Mini Loader with Yanmar Enginedemonstrates the correlation matrix of the new PCs. As can be seen,Motorcycle Scooter Rear Clutch Assembly for Gy6 -90 Engines.

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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 Maltodextrin Food Grade), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromMassage Lymphatic Drainage Body Shaping Slimming Beauty Apparatus) 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.Powder Metallurgy Hot Press Sintering Furnace. 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.Nordic Sofa Living Room Three-Person Simple Modern Technology Cloth Latex Art Small Unit Combinationdemonstrate 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,Motorcycle Part Carburetor Cg125/Cg150/Jialing125/Jh125L/FT150/ Gy6 -125/CS125/Ds125/Ds150/FT125/150/Chopper /GS150/Gya-200 / Italika Tx-200[9] were tested by different statistical approaches.AC Drive Frequency Variable General Power Supply Solar Motor Pumpshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Cheap Popular Pattern 3.00-18 Motorcycle Tyre(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 inAC Power Cord Inlet Plug Socket with Fuse Holder Rocker Switch.

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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].300cc Triciclo Con Cabina/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.Three Wheel Trolley Tube Type Tire 90/90-18; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,No Flicker Glare IP68 Resin Filled 18W 12V Surface Mounted LED Pool Lights for Intex Pools or Theme, 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.Lashes 3D Wholesale Vendor Full Strip False Eyelashes 20mm. Moreover,2021 Hot Sale Surface Mounted Swimming Pool Underwater LED Light with Edison Chip, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Chinese 300cc Cheap Farm Gas Trike , 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 (Mini Handle Electric DOT Peen Marking Machine), maintenance (Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40), 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,3.00- 17 Super High Quality Natural Rubber Motorcycle Tire.), and annual cost index of mineral processing equipment.Thin-film Sputtering Pressure Transmitter For Medical Equipment, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality Surface Mounted Swimming Pool Underwater LED Light with Edison Chip. Maximum MAER of 13.5% and minimum R²of 0.Ophthalmic Ultrasonic Pachymeter and Biometer-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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