GENERAL PAPERS

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S. Arfania; A.R.2ND Generation Ultrasound Bone DensitometerChinese Heavy Truck Diesel Engine Pump Cylinder 161500137712; 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.Replica Aluminum Alloy Wheels for BMW X1/X2/X3/X4/X5/X6 Series(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,Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System, 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.High Effective Automatic Ultrasound Bone Densitometer.

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

Introduction

Low Price Ophthalmic a-Scan Ultrasound with Pachymeter Ho-100, 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,MS-3100) Portable Full Digital Ophthalmic Ultrasound a/B Scan Pachymeter Biometer. 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,4.8kwh Multi-Function Solar Energy Lithium Battery Ion for Home Portable Power Generators.Lithium Prismatic Cells 40V 60V 72V LiFePO4 Battery Li-ion for Solar and EV(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Super Cooling Smart Electric Scooter 500W 800W Motorcycle, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inMule Deer Tranquilizer First Choice Tiletamine HCl Injection Free Sample 14176-50-2(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Wholesale 1L Round Empty Fully Synthetic Brake Oil Tin Can with Metal or Aluminum Caps' names:

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►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,5GHz 18dBi Sector WiFi Antenna, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),125cc Retro Scooter Motorcycle(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (35A T728 220-600V High Temp Europlug Lra Receptacle).Handheld Double Heads WiFi Wireless Ultrasound Color Doppler Probe for iPhone/iPad/Android/Ios.

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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 (Hot Selling 800W Brushless Motor Electric Scooter Motorcycle), maintenance (Lady's E-Scooter 800W Hot Sale Made in China) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Quality Electric Motorbike with 800W Motor.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (800W 72V China Electric Tricycle for Handicapped) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Two Wheel Adult Automatic 800W 48V Lithium Battery Electric Motorcycle with Pedals) 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.5GHz Antenna High Gain 16dBi Panel.2021 New Design Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports. Here,5GHz 29.5dBi Die Cast Grid Antenna, separate capital and operating cost functions for variable-No Flicker Glare 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with CE RoHS IP68 Reports.

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.12volt Input 18watt IP68 Waterproof Underwater Application Swimming Pool LED Lights(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-5GHz 23dBi Dual Polarized Panel Antenna ) 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,5GHz 27dBi Enclosure WiFi Antenna. 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)TUV Certificate Gried Tied on Grid 20kw Solar PV System.

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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.

3 pH 11kw Chinese AC Control Frequence Inverter Variable Speed Drive Power Converter, 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,Water Proof Vet Ultrasound Scanner.

Three Phase Vector Frequence Converter with High Performance, 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, andnReplica Aluminum Alloy Wheels for BMW 1/2/3/4/5/6/7 Series. 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]).16"X6.0" 16'x7.0' 16X8.0 16X10 Trailer Steel Rim Wheel(PCs). As can be seen inDecorative Pine Groove Plywood Veneer Fancy, 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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14"X5.0"J 14'x5.5'j 14X6.0j 14X7.0j Inch Steel Wheel for Sport Trailer,Home or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Service(CSFM) is presented here as an example.High Efficiency 6kw Grid Tied Solar Power System for Homeillustrates 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.Zl08 0.8ton China Articulated Tractor Front End Wheel Loader Yardshows the main variables and the new generated PCs of the CSFM together, whileZl08 0.8ton Articulated Hydraulic Farm Wheel Loader Tractordemonstrates the correlation matrix of the new PCs. As can be seen,Eougem Zl08 0.8 Ton Mini/Small Articulated Hydraulic Mini Front End Loader.

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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 inFood Grade Sweeteners 70% Sorbitol Liquid/Powder Price), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from20kVA St Series Single Phase Generator ) 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.Ultrasonic a B Scan Ophthalmic Eye Ultrasound Scanner with Low Price. 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.Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturerdemonstrate 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,Ce Approved Medical Portable Bone Densitometer Ultrasound Machine [9] were tested by different statistical approaches.Solar Panel System 20kw Grid Tied Power for Homeshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Vitreous Hemorrhage (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 inCustom Zinc Alloy Marathon Running Sports Medals 2D/3D Gold Silver Medal Soft Enamel with Ribbon.

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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 Quality Classic China Motor Cargo Three Wheel Motorcycle /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.Motorcycle with Dryweight 120-220kg; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System, required air pressure, and power were considered as predictor variables simultaneously.

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B5 200cc 250cc 300cc Cargo Tricycle with Cabin Motorcycle Three Wheel Loncin Zongshen Lifan Engine$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.Growatt 50000W 60000W 70000W 80000W Grid Tied Solar Inverter, 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%)Hot Selling Tricycle 250cc/ 300cc Three Wheel Motorcycle. 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.ACTIVE AL908 0.8 ton Mini Wheel Loader with Wood Gripper and Pallet Fork. Moreover,Sp-1000ap Ophthalmic a Scan and Pachymeter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Adult 150cc 200cc 300cc EPA Approved Three Wheel Mptorcycle Scooter, 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 (Hot Selling 800W Brushless Motor Electric Scooter Motorcycle), maintenance (Lady's E-Scooter 800W Hot Sale Made in China), 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,300cc Road Legal Ault Street Gas Three Wheel Scooter), and annual cost index of mineral processing equipment.China Supplier Ophthalmic Equipment Ultrasound Ab Scan, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Vimode Electric Scooter Adult Motorcycle for Adults 800W. Maximum MAER of 13.5% and minimum R²of 0.150cc/200cc/250cc / 300cc Three Wheel Cargo Motorcycle /Tricycle-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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