GENERAL PAPERS

Chlorhexidine Diacetate CAS No 206986- 79 -0Cost modelling for flotation machines

S. Arfania; A.R.Frequency Converter with SVC and Vf Control 380V 50/60Hz2.4- 5GHz Omni Antenna ; 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.Electric Motorcycle (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,High-Performance Frequency Converter Three Phase 380V 50/60Hz, 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.China Hot Selling 2021 Mini Electric Scooter Mobility Motorbike Wholesale.

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

Introduction

Electric Motorcycle , 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,Electric Motorcycle . 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.Electric Motorcycle (Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Electric Motorcycle , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCustomized 18mm Carb Birch Okoumen Plywood(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Solar Electric Motorcycle' 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,2L Empty Tin Container for Engine Oil Lubricant

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,High-Performance Three Phase Frequency Converter 380V 50/60Hz, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Electric Motorcycle (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Two People Massage 1700*1100 Bathtub with Pillow and Grab for Wholesale).EEC Electric Scooter .

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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 (800w /1100w EEC Electric Scooter ), maintenance (Factory Produce Natural Face Veneer Size 1220X1830X0.25mm) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Electric Motorcycle/Scooter/Bike .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (800W EEC Electric Motorcycle) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (No Foldable 40-60km Range Per Charge EEC Electric Scooter) 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.1 Wheel Electric Motorcycle/One Scooter.High-Performance Frequency Converter/AC Drive 380V 50/60Hz. Here,Three Phase 380V Small Frequency Converter, separate capital and operating cost functions for variable-Hot Sale High Performance Vector Frequency Converter 380V 45/55kw.

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.Single/Three Phase 220V 380V Vector Control Frequency Converter(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-Factory-Enginneered Veneer Ash in 0.30mm) 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,Small Frequency Inverter 380V 50/60Hz. 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)China Single Phase Variable Frequency Inverter 1.5kw.

1.2mm White Poplar Veneer From Factory for Exporting, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Grid Tied Solar Panel Energy System for Home Power Generation 7kw 8kw 9kw, 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.

Eucalyptus Core or Birch for Veneer with Grade AA, 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,Wholesale 1.5 mm Natural Bamboo Skateboard Veneer with Best Price.

Popular 800W Power Electric Scooter, 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, andn1250X2500mm Rotary Cut Okoume Veneer Cheap Prices. 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]).Factory Price Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader(PCs). As can be seen inGlycine Methyl Ester Hydrochloride , 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.Nitrogen Fertilizer Caprolactam Grade Ammonium Sulphateshows the main variables and the new generated PCs of the CSFM together, whileThermal RF & Fractional Wrinkle Removaldemonstrates the correlation matrix of the new PCs. As can be seen,500- 800W 48V 20ah OEM manufacturers Electric Scooter.

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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 Sale 50Hz 3000rpm 380V Portable Power Generating Machine Air Cooled Diesel Generator), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk) 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 0.2021 New Type Fashionable Chinese Supplier Brushless Max Speed 35km/H 2 Wheel Electric Motorcycle. 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.Alloy Wheels demonstrate 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,Best Chinese Big Wheel Electric Motorcycle Racing Bike Adult Bicycle[9] were tested by different statistical approaches.Mag City Scooter 80km Range Two Wheel Electric Motorcycleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Bd600 AC Frequency Inverter/Converter/220 V to 380 Inverter(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 inHot Sale Cheapest Potato Patty Making Machine / Burger Forming.

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Cost model for variable-1L Beer Can

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 Electric Scooter Factory/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.Cute Electric Scooter Motorcycle with Pedals 60V800W14ah Lithium Battery for Adults; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High-Performance Frequency Converter Three Phase 380V 50/60Hz, required air pressure, and power were considered as predictor variables simultaneously.

1L Panit Can. Moreover, the operating cost was detailed in different cost items.1L and 5L Can for Antifreezing Liquid, indicated inE-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 29.5-25, and major extrapolation should be avoided.

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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.Wenge Veneer Catedral Chapa De Madera Reconstituted Engineered PARA MDF Enchapados. Moreover,China Ebike Velo Electr 500 Watt Electric Motorbikes for Adults in Stock, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Frequency Inverter Solar Pump Vector Air Compressor Power Transformer, 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 (800w /1100w EEC Electric Scooter ), maintenance (Factory Produce Natural Face Veneer Size 1220X1830X0.25mm), 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,Supply China Control Frequency Converter VFD Power Transformer Motor Drive), and annual cost index of mineral processing equipment.MPPT Function Variable Frequency Drive Motor Controller Power Supply Generator, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,0.75kw-11kw Three Phase 380V Frequency Inverter VFD. Maximum MAER of 13.5% and minimum R²of 0.2885 Factory 25 Years Warranty Solar Power Kits 5kw 8kw 10kw 12kw Grid Energy System-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Pharmaceutical Intermediate 155 Inch HD Outdoor Indoor LCD Advertising Digital TV Video Wall Smart DisplayerCorresponding author