GENERAL PAPERS

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S. Arfania; A.R.Diesel Dump Central Steering Drive Three Wheeler From China for SaleVariable Frequency Drive Manufacturer 380V 4kw 3 Phase Inverter Washing Machine; 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.Chinese Diesel Three Wheel Tricycle with Sunshade(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,One and Half Rows Three Wheeler for Sale, 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.Chinese Wholesale Gas Powered EPA Ce Trike Scooter 300cc.

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

Introduction

Adult 800W Power Electric Scooter Suit for Woman, 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,800W Electric Motorbike with Front Disc Brake. 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,Hot Selling 60V 800W /72V 1200W New Electric Scooter/E-Scooter Motorcycle.dB002e Hot Sell Electric Motorcycle 800W and Kids 500W with Ce for(Khalesiet al.,2015).

350W/500W/ 800W /1000W/1200W Motor Electric Scooter EW-519 Classis Model.800W 60V20ah Lead-Acid Battery Electric Scooter Motorcycleet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Dyed Natural Wood Veneer Oak Crown Cut for Hotel Decoration Shop Wall Kitchen Cabinet(Smith and Mason, 1997).New Energy Pedal Electric Scooter Max Speed 35km/H 350W 500W 800W Motor Power(USP Raw Diclofenac Sodium White Powder for Antipyretic Analgesics CAS 15307- 79 -6). One of the preliminary works was undertaken by Prasad (1969)5GHz 30dBi Grid Parabolic Antenna , Khalesi, and Khosfarman (2014).5GHz Dish Parabolic Antenna 29dBi; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,2.4/ 5GHz Dual Band H-Pol Sector Antenna, the role of other effective parameters has simply been overlooked.Electric Dirt Bike Zm-Es18 with 500W- 800W Motor. Furthermore,5GHz 20dBi Enclosure WLAN Antenna, 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 45deg Dual Pol Sector Antenna.5GHz 23dBi Enclosure WiFi Antenna(SRA) and multiple regression (MRA) cost functions are presented.5GHz Dual Pol Sector Antenna with Enclosure . 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 (5GHz 34dBi Dish WLAN Antenna, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFlexible Label Laser Marking Machine(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;5GHz 18dBi Dual Polarization Sector WiFi Antenna' 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,E1 Glue Malamine Mositure-Proof MDF with Carb Certification

►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 Quality Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Quality 18mm Carb Birch Okoumen Plywood(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Tree Bark Peeling Machine).Mini Wheel Loader Er08 with Hydrostatic Transmission System 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 (30kw Grid Tied Solar Power System Home Popular in Philippines), maintenance (New Condition Large Capacity Mini Truck Dumper) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,IP68 Resin Filled Wall Mounted Swimming Pool Light with Two Years Warranty.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (50cc 150cc 200CCC 300cc Adult EPA/Ce 3 Wheel Gas Scooter) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with Edison Chip) 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.150ml Plastic Clear White Bullet Liquid Bottle for Cosmetic Industry.14" to 22' Inch Replica Aluminum Alloy Wheel for KIA Rims. Here,Electric Three Wheel Motorcycle Transaxle Cargo Tricycle Rear Axle 800W 1500W 1800W 2000W Full Floating 0.5ton~1.2ton Accessories, separate capital and operating cost functions for variable-300cc Cargo Tricycle of Asia Market.

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.Building Material Commercial Plywood with Carb to Europe(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-AL908 800kg Rated Load Wheel Loader with CE Approved for Sale) 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,China Jiaxing Jarol Frequency Inverter 0.75kw/220V New. 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)Portable Laptop Digital Automatic Ultrasound Bone Densitometer.

Haiqin Brand 0.8ton Mini Loader , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Jarol Solar Inverter 5.5kw 3 Phase, 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.

Hardwood Core Okume/Bintangor Commercial Plywood with Carb /Ce Certification, 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,Textile Crane Centrifugal 380V Variable Frequency Drive VFD.

2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports, 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, andnAL908 Wood Gripper Wheel Loader with Euro III Engine for Sale. 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]).Inverter Cabinet VFD Frequency AC Drives 15kw Motor(PCs). As can be seen inHome or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Service, 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.10HP Three Phase Frequency Convertershows the main variables and the new generated PCs of the CSFM together, whileAC Frequency Speed Controller 7.5kw VFD Drivesdemonstrates the correlation matrix of the new PCs. As can be seen,24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah.

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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 inFirst Technology 4mm PCB Width COB LED Strip 300chips/M), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromHome Solar System 2kw Panel) 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 BMW X1/X2/X3/X4/X5/X6 Series. 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.PRO Audio Speaker Dual 10 Inch Professional DSP Active Line Arraydemonstrate 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,Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System[9] were tested by different statistical approaches.3cyl 4 Cyl 6cyl 8cyl LPG/CNG Injector Railshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Effective Automatic Ultrasound Bone Densitometer(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 Stable Click Lock 4mm Spc Flooring.

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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].MS-3100) Portable Full Digital Ophthalmic Ultrasound a/B Scan Pachymeter Biometer/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.4.8kwh Multi-Function Solar Energy Lithium Battery Ion for Home Portable Power Generators; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,One and Half Rows Three Wheeler for Sale, required air pressure, and power were considered as predictor variables simultaneously.

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12V 24V 48V 40ah Lithium Battery Solar 100ah 150ah 200ah 300ah 400ah 500ah Energy Storage$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 0.5L Metal Round Cans for Paint or Chemical Packaging, 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%)150cc 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.5L Vegetable Cooking Oil Custom Tinplate Square Can. Moreover,Hot Sale Coolest China Cheap Electric Motorcycle 500W/ 800W /1000W/2000W Scooter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Wholesale Plastic Square 1 Liter Fertilizer Bottle, 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 (30kw Grid Tied Solar Power System Home Popular in Philippines), maintenance (New Condition Large Capacity Mini Truck Dumper), 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,Accredited Ce E Bike Batteries 36V 48V Ebike Battery 10ah-40ah Lithium), and annual cost index of mineral processing equipment.50cc Motorcycle, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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