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S. Arfania; A.R.Triple Phase Variable Frequency Inverter AC DriveAlone Standing Advertising Digital Signage Touchscreen Interactive Kiosk; 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.White Steel Wheel for Truck 17.5X6.00(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,Carb Grade 18mm Commercial Plywood, 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.Highlighted LED Electric Motorcycle with 60V 800W Power System.

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

Introduction

AC 3 Phase 380V Compact Vectorial Inverter Frequency 220V, 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 Speed Full Size Adult 800W Z1000 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,AC Drives Frequency Inverter for Dyeing Machine.1220*2440*18mm Birch Plywood with Carb P2 Standard Quality(Khalesiet al.,2015).

Solar Pump Frequency Inverter MPPT Fuction 15kw Made in China.China Wholesales Wheel Loader HR912 with Pallet Forkset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2852 Alicosolar Solar Energy System 10kw 5kw Power Home 15kw Grid Tied(Smith and Mason, 1997).AC Frequency Speed Controller 7.5kw VFD Drives(Automobile Paint Can 5L Square Tin with Metal Cap for Ink Oil). One of the preliminary works was undertaken by Prasad (1969)Carb P2 Bleached White Poplar Plywood for Furniture, Khalesi, and Khosfarman (2014).Professional Mini Wheel Loader for Sale with Low Price; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,New Model Chinese Small Loader Front End Wheel for Sale, the role of other effective parameters has simply been overlooked.Mimo Antenna 13dBi CPE. Furthermore,1220X2440X9mm Carb P2 Glue Bleached Poplar Plywood for Furniture, and estimation of detailed operating cost items such as maintenance, lubrication,etc.is not possible. To overcome these deficiencies, this paper aims to introduce up-to-5GHz 25dBi Dual Pol Enclosure Antenna.Bleached Poplar/Birch Carb Plywood(SRA) and multiple regression (MRA) cost functions are presented.Weifang Cp Cloud Pillar Brand Ce Approved Zl08 Multi-Function Mini Wheel Loader with Cheap Price. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.

Methodology

Data

Thirty-seven major flotation machines (Newest Kids Pedal Electric Drift Crazy Kart Go, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inEffects Night Club Bluetooth Powered Speaker Pofessional PA Line Array(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Zl08 Mini Small Garden Farm Tractors Compact Front End Wheel Loader' 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,Whole Sale Hammerhead 150cc Go Kart with Parts

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Earthmoving Equipments Mini Wheelloader Wl80 Loader Radlader, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),10MHz Linear Vascular/Anesthesia Portable Wireless Ultrasound Scanner(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (SAE5140/ SCR440 /1.7035/40CR Forged Alloy Tool Round Bar).Advanced 7.5MHz/10MHz Superficial Organ Use Wireless Linear Ultrasound Probe.

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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 (WiFi Probe Type 2 in 1 Double Head Wireless Mini Color Doppler Ultrasound), maintenance (Weifang Cp Cloud Pillar Ce Approved 800kg Multi-Function Mini Loader with Quick Hitch/Electric Joystick/Floating Function for Germany/Norway/Finland) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Aj-Bmd500 New Generation Ultrasound Bone Densitometer.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (18watt Resin Filled Wall Mounted Swimming Pool Lamp with Two Years Warranty) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (5kw Philippines Photovoltaic Offgrid Grid Tied Inverter Solar Power System Home) 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.Solar Power System 8kw Grid Tied Solution.CE China manufacturers mini wheel loader for sale at cheap price. Here,Wolf Agricultural Machinery Construction Small Front End Wheel Loader with Euro5 and Tier4 Engine, separate capital and operating cost functions for variable-China Portable Medical Ophthalmic a/B Ultrasound Scanner Pachymeter with B Probe for Eyes.

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.6000W 200V-240V AC Single Phase on Gird/ Grid- Tied Solar Power Energy System(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-Ce Approved 10 Inch Automatic High Effective Ultrasound Bone Densitometer ) 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 10dBi Wideband Omni WLAN 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)Jy125t-36c 125cc Scooter with Cdi and Efi.

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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.

5GHz 23dBi Enclosure WLAN Antenna, 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,16" Inch Steel Wheel for Toyota Prado Land Cruiser.

off Road 200cc Motorcycle for Hot 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, andnoff Load 150cc Motorcycle with High Speed. 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]).China 125cc Moto Efi Euro 4 2t 4t Stroke Motorcycle Motor 49cc 50cc 150cc Moped EPA EEC Gas Scooter(PCs). As can be seen in1389 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System, 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.Flexible Label Laser Marking Machine for Airbag Warning Labelsshows the main variables and the new generated PCs of the CSFM together, whileCute Street Electric Scooter with LED Light 60V800W20ahdemonstrates the correlation matrix of the new PCs. As can be seen,20" Inch Replica Aluminum Alloy Wheels for Astonmartin.

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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 inColor IR Dome CCD Camera), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from0.8t Multifunctional Hydraulic Wheel Loader for Farm) 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.Replica Aluminum Alloy Wheels for Volkswagen VW Tiguan Atlas Touareg. 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.Ammonium Sulphate N21% Powder+Crystal+Granular Steel+Caprodemonstrate 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,Hot Sell Good Quality Best China Manufacturer Factory Price Transvaginal Probe Type Wireless Mini Ultrasound Scanner[9] were tested by different statistical approaches.Outdoor Line Array PA System Loudspeakershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Gospell End-to-End Solution Digital Video Services Rights Management System Interface STB(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 inagrochemical Chlorpyrifos 45� 30% EW 30%CS.

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Cost model for variable-Medical Automatic Ultrasound Bone Densitometer in Low Price

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].Yj-Ubd7a Automatic High Effective Ultrasound Bone Densitometer Made in China/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.Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scanner; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Carb Grade 18mm Commercial Plywood, required air pressure, and power were considered as predictor variables simultaneously.

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Diesel Central Drive Three Wheel Dumper for Sale$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.Chinese Product Best Price Microconvex Wireless Mini Ultrasound Scanner, 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%)Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital. 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.Apr125 White Motorcycle. Moreover,Apr125 Red Motorcycle, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Apr125-2 White Motorcycle, 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 (WiFi Probe Type 2 in 1 Double Head Wireless Mini Color Doppler Ultrasound), maintenance (Weifang Cp Cloud Pillar Ce Approved 800kg Multi-Function Mini Loader with Quick Hitch/Electric Joystick/Floating Function for Germany/Norway/Finland), 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,Underwater Swimming Pool Light Decoration LED Lamp), and annual cost index of mineral processing equipment.IN-AC5MC USB mobile scan cheapest pocket handheld hospital ultrasound scanner, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Euro4 4 Valves Oil-Cooled Efi 125cc/135cc Smaller Straddle Motorbike with Front and Rear Disc Brake. Maximum MAER of 13.5% and minimum R²of 0.350cc Motorcycle with Double-Cylinder & Water-Cooled Engine -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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