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S. Arfania; A.R.off Road 200cc Motorcycle for Hot SaleWater Proof Vet Ultrasound Scanner; 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.off Load 150cc Motorcycle with High Speed(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 125cc Moto Efi Euro 4 2t 4t Stroke Motorcycle Motor 49cc 50cc 150cc Moped EPA EEC Gas 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.China Al-Gw6 800W Electric Motorbike with 60V/20ah Battery.

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

Introduction

Linux TV Box International Internet Smart IPTV Zgemma I55, 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,Replica Aluminum Alloy Wheels for BMW. 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,20" Inch Replica Aluminum Alloy Wheels for Astonmartin.2021 Google Certified Internet HDD Full HD 1080P Xangshi U7 S905W 2RAM 8ROM Android Media Player(Khalesiet al.,2015).

Replica Aluminum Alloy Wheels for Volkswagen VW Tiguan Atlas Touareg.Hot Sell Good Quality Best China Manufacturer Factory Price Transvaginal Probe Type Wireless Mini Ultrasound Scanneret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for New Brand Diesel Engine with Four Stroke Multy-Cylinder Used for Generator Set(Smith and Mason, 1997).Gospell End-to-End Solution Digital Video Services Rights Management System Interface STB(Mini Size Water Differential Pressure Sensor for HVAC). One of the preliminary works was undertaken by Prasad (1969)Medical Automatic Ultrasound Bone Densitometer in Low Price, Khalesi, and Khosfarman (2014).Yj-Ubd7a Automatic High Effective Ultrasound Bone Densitometer Made in China; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scanner, the role of other effective parameters has simply been overlooked.IN-A4CPL Portable Wireless WiFi ultrasound color doppler scanner machine. Furthermore,Automatic High Effective Ultrasound Bone Densitometer Made in China, 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-Diesel Central Drive Three Wheel Dumper for Sale.Chinese Product Best Price Microconvex Wireless Mini Ultrasound Scanner(SRA) and multiple regression (MRA) cost functions are presented.Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital. 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 (Apr125 White Motorcycle, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inhot selling small avant articulated tractor wheel loader for garden landscaping(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Apr125 Red 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,350cc Motorcycle with Double-Cylinder & Water-Cooled Engine

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Popular Medical Device Automatic Bone Densitometer, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Diesel Cargo Three Wheel Tricycle for Sale From China(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (22L Large Capacity Multi-Pockets Leak-Proof Picnic Bag for Hiking).Diesel Dump Central Steering Drive Three Wheeler From China for Sale.

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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 (Chinese Diesel Three Wheel Tricycle with Sunshade), maintenance (One and Half Rows Three Wheeler for Sale) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Chinese Wholesale Gas Powered EPA Ce Trike Scooter 300cc.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Adult 800W Power Electric Scooter Suit for Woman) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (800W Electric Motorbike with Front Disc Brake) 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.Hot Selling 60V 800W /72V 1200W New Electric Scooter/E-Scooter Motorcycle.dB002e Hot Sell Electric Motorcycle 800W and Kids 500W with Ce for. Here,350W/500W/ 800W /1000W/1200W Motor Electric Scooter EW-519 Classis Model, separate capital and operating cost functions for variable-800W 60V20ah Lead-Acid Battery Electric Scooter Motorcycle.

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.New Energy Pedal Electric Scooter Max Speed 35km/H 350W 500W 800W Motor Power(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 30dBi Grid Parabolic 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 Dish Parabolic Antenna 29dBi. 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)2.4/ 5GHz Dual Band H-Pol Sector Antenna.

Electric Dirt Bike Zm-Es18 with 500W- 800W Motor, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (5GHz 20dBi Enclosure WLAN Antenna, 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.

5GHz 45deg Dual Pol Sector 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,5GHz 23dBi Enclosure WiFi Antenna.

5GHz Dual Pol Sector Antenna with Enclosure , 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, andn5GHz 34dBi Dish WLAN Antenna. 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]).5GHz 18dBi Dual Polarization Sector WiFi Antenna(PCs). As can be seen inPRO Audio PA System Digital Mixer, 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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Poplar Film Faced Plywood Board with Carb Certificate,18W 12V IP68 Waterproof LED Swimming Pool Lamps(CSFM) is presented here as an example.DSP Active Line Array Speakerillustrates 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.Covered Tricycle Carriage Closed Cargo Boxshows the main variables and the new generated PCs of the CSFM together, whileProfessional Speaker System Single 10 Inch 300W Mini Stage Monitor PS10r2demonstrates the correlation matrix of the new PCs. As can be seen,Hot Sale on-Grid 20kw Grid Tied Solar Power Home System.

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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 inChina Factory Wholesale 2K/ 4K /T2/S2 27 Inch Home System Theatre Television Smart Android Tempered Glass LED TV), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromHot Sale Vacuum Bag Nylon Material for Agricultural Products) 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.High Quality Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports. 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.Gtb1749vk Turbo Cartridge 798128-0004 for 2011- Peugeot Boxerdemonstrate 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,Quality 18mm Carb Birch Okoumen Plywood[9] were tested by different statistical approaches.Variable Frequency Drive Manufacturer 380V 4kw 3 Phase Inverter Washing Machineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Mini Wheel Loader Er08 with Hydrostatic Transmission System for Sale(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 inNew 90LED / M 2835 LED Hard Strip Waterprof High Brightness.

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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].New Condition Large Capacity Mini Truck Dumper/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.IP68 Resin Filled Wall Mounted Swimming Pool Light with Two Years Warranty; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China 125cc Moto Efi Euro 4 2t 4t Stroke Motorcycle Motor 49cc 50cc 150cc Moped EPA EEC Gas Scooter, required air pressure, and power were considered as predictor variables simultaneously.

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150ml Plastic Clear White Bullet Liquid Bottle for Cosmetic Industry$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 0.14" to 22' Inch Replica Aluminum Alloy Wheel for KIA Rims, 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%)Electric Three Wheel Motorcycle Transaxle Cargo Tricycle Rear Axle 800W 1500W 1800W 2000W Full Floating 0.5ton~1.2ton Accessories. 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.300cc Cargo Tricycle of Asia Market. Moreover,Building Material Commercial Plywood with Carb to Europe, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (AL908 800kg Rated Load Wheel Loader with CE Approved for Sale, 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 (Chinese Diesel Three Wheel Tricycle with Sunshade), maintenance (One and Half Rows Three Wheeler for Sale), 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,China Jiaxing Jarol Frequency Inverter 0.75kw/220V New), and annual cost index of mineral processing equipment.Portable Laptop Digital Automatic Ultrasound Bone Densitometer, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Haiqin Brand 0.8ton Mini Loader . Maximum MAER of 13.5% and minimum R²of 0.Jarol Solar Inverter 5.5kw 3 Phase-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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