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S. Arfania; A.R.Medical Automatic Ultrasound Bone Densitometer in Low PriceGas Ski Adult PRO Electric Start Snow Scooter; 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.Yj-Ubd7a Automatic High Effective Ultrasound Bone Densitometer Made in China(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,Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scanner, 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.IN-A4CPL Portable Wireless WiFi ultrasound color doppler scanner machine.

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

Introduction

Automatic High Effective Ultrasound Bone Densitometer Made in China, 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,Diesel Central Drive Three Wheel Dumper for Sale. 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,Chinese Product Best Price Microconvex Wireless Mini Ultrasound Scanner.Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital(Khalesiet al.,2015).

Apr125 White Motorcycle.Apr125 Red Motorcycleet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Square Engine Oil Can Metal Paint Tin Container with Plastic Lid(Smith and Mason, 1997).Apr125-2 White Motorcycle(KTV Single 8" Full Range Audio&Sets). One of the preliminary works was undertaken by Prasad (1969)Underwater Swimming Pool Light Decoration LED Lamp, Khalesi, and Khosfarman (2014).IN-AC5MC USB mobile scan cheapest pocket handheld hospital ultrasound scanner; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Euro4 4 Valves Oil-Cooled Efi 125cc/135cc Smaller Straddle Motorbike with Front and Rear Disc Brake, the role of other effective parameters has simply been overlooked.350cc Motorcycle with Double-Cylinder & Water-Cooled Engine . Furthermore,Popular Medical Device Automatic Bone Densitometer, 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 Cargo Three Wheel Tricycle for Sale From China.Diesel Dump Central Steering Drive Three Wheeler From China for Sale(SRA) and multiple regression (MRA) cost functions are presented.Chinese Diesel Three Wheel Tricycle with Sunshade. 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 (One and Half Rows Three Wheeler for Sale, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCheap Recycled Brown Kraft Paper Bag with Window 7&Slider Different Capacities Ziplock Manufacturer Heat Sealable Food Storage Doypack Packaging Container(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Chinese Wholesale Gas Powered EPA Ce Trike Scooter 300cc' 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,350W/500W/ 800W /1000W/1200W Motor Electric Scooter EW-519 Classis Model

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,800W 60V20ah Lead-Acid Battery Electric Scooter Motorcycle, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),New Energy Pedal Electric Scooter Max Speed 35km/H 350W 500W 800W Motor Power(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Single Wall Paper Cup with Customized Logo).5GHz 30dBi Grid Parabolic Antenna .

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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 (5GHz Dish Parabolic Antenna 29dBi), maintenance (2.4/ 5GHz Dual Band H-Pol Sector Antenna) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Electric Dirt Bike Zm-Es18 with 500W- 800W Motor.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (5GHz 20dBi Enclosure WLAN Antenna) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (5GHz 45deg Dual Pol Sector Antenna) 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 23dBi Enclosure WiFi Antenna.5GHz Dual Pol Sector Antenna with Enclosure . Here,5GHz 34dBi Dish WLAN Antenna, separate capital and operating cost functions for variable-5GHz 18dBi Dual Polarization Sector WiFi Antenna.

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.18W RGB Resin Filled LED Surface Mounted Underwater Pool Light(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-Poplar Film Faced Plywood Board with Carb Certificate) 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,18W 12V IP68 Waterproof LED Swimming Pool Lamps. 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)Hot Sale on-Grid 20kw Grid Tied Solar Power Home 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.

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whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Mini Wheel Loader Er08 with Hydrostatic Transmission System for Sale.

30kw Grid Tied Solar Power System Home Popular in Philippines, 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, andnNew Condition Large Capacity Mini Truck Dumper. 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]).IP68 Resin Filled Wall Mounted Swimming Pool Light with Two Years Warranty(PCs). As can be seen in2021 New 350W Electric Moped Motorcycle/Electric Pedal Moped/Best Motorcycle for Adults, 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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2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with Edison Chip,150ml Plastic Clear White Bullet Liquid Bottle for Cosmetic Industry(CSFM) is presented here as an example.99% Glycolic Acid Powder CAS 79 -14-1illustrates 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.High Power Horn Speaker H3shows the main variables and the new generated PCs of the CSFM together, whileModern Furnituredemonstrates the correlation matrix of the new PCs. As can be seen,14" to 22' Inch Replica Aluminum Alloy Wheel for KIA Rims.

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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 in2021 The Best Copeland Scroll Zf33K4e-Twd- 551 Compressor for Chiller), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromRosen 8kw Grid Tied on Solar Panel System) 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 0.300cc Cargo Tricycle of Asia Market. 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.1250X2500mm Rotary Cut Okoume Veneer Cheap Pricesdemonstrate 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,Building Material Commercial Plywood with Carb to Europe[9] were tested by different statistical approaches.N21% Nitrogen Fertilizer Ammonium Sulphate Factory Priceshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.AL908 800kg Rated Load Wheel Loader with CE Approved 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 in14mm 10PCS/Set Acrylic Colorful D6 Dice.

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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].Portable Laptop Digital Automatic Ultrasound Bone Densitometer/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.Haiqin Brand 0.8ton Mini Loader ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scanner, required air pressure, and power were considered as predictor variables simultaneously.

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Textile Crane Centrifugal 380V Variable Frequency Drive VFD$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 0.2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports, 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%)AL908 Wood Gripper Wheel Loader with Euro III Engine for Sale. 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.Inverter Cabinet VFD Frequency AC Drives 15kw Motor. Moreover,2021 New Design Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater 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 (12V RGB Resin Filled Underwater Pool Lights with 2 Years Warranty, 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 (5GHz Dish Parabolic Antenna 29dBi), maintenance (2.4/ 5GHz Dual Band H-Pol Sector Antenna), 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,loader with excavator grapple wheel mini for sale good quality), and annual cost index of mineral processing equipment.24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,2ND Generation Ultrasound Bone Densitometer. Maximum MAER of 13.5% and minimum R²of 0.Replica Aluminum Alloy Wheels for BMW X1/X2/X3/X4/X5/X6 Series-feasibility and even feasibility study level of projects.

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High Quality Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-2.4/ 5GHz 10dBi Rubber WiFi Antenna.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [1L Custom Metal Round Tin Cans Box Packaging for Glue Coating Slovent]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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