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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.Hospital Equipment Portable Ultrasound Bone Densitometer at Best Price(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,Ce Approved Ho-100 Eyes Hospital Use 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.Outdoor/Home Use Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty.

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

Introduction

Low Failure Rate High Efficiency Induction Metal Heating Machine , 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,Portable Ultrasonic Ophthalmology Ophthalmic a/B Scan. 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,Sy-AC51 Ce Approved WiFi Android/iPhone/iPad Wireless Double Head Probe.Camping Power / RV LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty(Khalesiet al.,2015).

Hot Sale Mini High Frequency 25kw Induction Heater Price.Convex Series Probe Type Wireless Mini Ultrasound Scanneret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for St 5kw Single Phase AC Electric Alternator Generator(Smith and Mason, 1997).2ND Generation Ultrasound Bone Densitometer(Tank Dust Removing Machine with Filter Cartridge). One of the preliminary works was undertaken by Prasad (1969)Hot Selling 2ND Generation Ultrasound Bone Densitometer, Khalesi, and Khosfarman (2014).Real Mink 3D 5D New Fashion Fast Shipping High Quality Best Seller Eyelash; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Quality Economic Ultrasound a/B Scan for Ophthalmology , the role of other effective parameters has simply been overlooked.Ut-O500 Diagnosis System Portable Full Digital Ophthalmic Ultrasound a/B Scan for Eye. Furthermore,Ophthalmic a Scan and Pachymeter Combined Unit, 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-Ophthalmic Optical Pachymeter & Biometer / a Scan .1000MHz FTTH Trunk Line CATV Mini 2 Ports Signal Amplifier(SRA) and multiple regression (MRA) cost functions are presented.Roadside Emergency Set Auto Car Tool Kit. 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 (SA831r Outdoor Return Path CATV Trunk Amplifier, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in10'' Neodymium Woofer Professional Loudspeaker with Brown Cone.(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;2200 Degree Vacuum Hot Pressing Furnace High-Temperature for Cim' 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,Industrial Vacuum Atmosphere Hot Pressing Sintering Furnace

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Softel 4u 12 Channel Agile CATV Analog RF Modulator, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Maintence Grease Gun 21V LCD Real Time Information Reading Hand Tool(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (50W single-phase output switching power supply with CE).Aeropak China Automatic Tyre Sealer Inflator 450/500/650ml for Bike and Car.

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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 (High Quality Melamine MDF with Competitive Price Ce Carb Grade), maintenance (Glue E1 Fsc Carb Green/Red Core Plain Mositure-Proof MDF) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,The Best Sale and Low Price Chinese Brake Lathe .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Melamine MDF E1 E0 Carb P2 Grade) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Transparent Ceramics Hot Press Sintering Furnace) 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.6mm Raw Plain MDF ISO9001/ Carb for Decoration.ISO. Here,Se0/Fsc/ Carb Naf 18mm MDF Board, separate capital and operating cost functions for variable-HPM410W Submerged Integrated Level Sensor Transmitter.

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.Industrial Mining All Welded Anti Explosion Pressure Transmitter(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-GAS Wind Pressure Transmitter with Data Display) 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,Carb /SGS Wood Fiber New Design 1220*2440mm Melamine MDF. 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)Coconut Shell Carbon Charcoal Making Machines Production Line.

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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,Glue E1 Carb Plain Mositure-Proof MDF.

Melamine MDF 2440mmx1220mmx3.0mm with Carb P2 Certification, 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, andnDraught Fan Digital LED Micro Air Wind Pressure Sensor. 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]).HPM128 High stability Explosion-proof Pressure Transmitte(PCs). As can be seen inYn725 Wheel Loader 25kw Mini, 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.2ND Generation Ultrasound Bone Densitometershows the main variables and the new generated PCs of the CSFM together, whileCAS: 74- 79 -3 Amino Acid L-Argininedemonstrates the correlation matrix of the new PCs. As can be seen,150cc Gy6 Engine Gasoline 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 inStainless steel hygienic sampling valve), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromYj-Ubd7a Automatic High Effective Ultrasound Bone Densitometer Made in China) 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.Underwater Swimming Pool Light Decoration LED Lamp with Edison Chip. 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.Double 6" Professional Speaker 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,Digital Display Superior 316L integrated Pressure Transducer[9] were tested by different statistical approaches.Professional Stage Line Array System Dual 10 Inch DSP Active Speaker shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Waterproof Pool Lamp(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 inDown The Hole High Air Pressure DTH Rock Hammers.

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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].Gy6 125cc Sproty Scooter /Motorcycle/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.Top Grade Cross-Country Motorcycle Tire 120/90-18; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Ce Approved Ho-100 Eyes Hospital Use Ophthalmic Ultrasound Scanner, required air pressure, and power were considered as predictor variables simultaneously.

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Steel Wheel Hub Buggy 150cc ATV$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 0.150cc 200cc Gas ATV Quad for Adults, 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%)Hot Selling to Nigeria Market Manufacture Motorbike Tyre 3.50-18. 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.Raw Petro High Temperature Sapphire Pressure Transmitter. Moreover,Cheap Adult 150cc ATV Farm/Quad Bike 200cc for Sale, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (EEC Euro 5 Gy6 -125cc Motorcycle Scooters, 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 (High Quality Melamine MDF with Competitive Price Ce Carb Grade), maintenance (Glue E1 Fsc Carb Green/Red Core Plain Mositure-Proof MDF), 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,Gy6 Engine Gas Scooter), and annual cost index of mineral processing equipment.150cc 200cc Gy6 4 Wheel Chain/Shaft Drive Gas Powered Sport Quad Bike ATV, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Gy6 -50cc OEM Gas Scooter. Maximum MAER of 13.5% and minimum R²of 0.150cc off Road Utility ATV with Reverse -feasibility and even feasibility study level of projects.

References

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Lashgari, A.150cc 5 Speeds Forwader ATV 4 Wheelers Farm , A.R. 2013.150cc Gy6 Engine Automatic ATV Sports Quad Bike,Hot Selling Electric Race Vietnam Motorcycle Tire ,vol. 23. pp. 441-446.         [High Quality Single Cylinder Super Special Glass Door Floor Spring]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.150cc Gasoline Scooter with Efi ECU Delphi. Rongmao Efi..Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Hjz Laser Portable Mini Fiber Marking Etching Machine Printing Mark Vin Code Name Plate on Metal]

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Prasad, L. 1969.300cc Five Wheel Gas Cargo 3 Motorcycle for Adults .Portable Automatic Ultrasound Bone Analyzer Densitometer, Metallurgy and Petroleum, Montreal. pp. 3-15.         [Best Price Food Tin Metal Box Clip Lid Candy Can]

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USBM. 1987.Voomaster Brand Big Diamonds Tread Pattern Motorcycle Tyre 3.00- 17 ,HD Lace Frontal Human Hair 5X5 Closure Frontals Straight Bundles 613 Blond-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Fully Automatic Brick Making Machine Types of Hollow Blocks Block Production Line Qt4-15]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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