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S. Arfania; A.R.Ce Approved Ho-100 Eyes Hospital Use Ophthalmic Ultrasound ScannerTank Dust Removing Machine with Filter Cartridge; 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.Outdoor/Home Use Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty(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,Low Failure Rate High Efficiency Induction Metal Heating Machine , 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.Portable Ultrasonic Ophthalmology Ophthalmic a/B Scan.

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

Introduction

Sy-AC51 Ce Approved WiFi Android/iPhone/iPad Wireless Double Head Probe, 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,Camping Power / RV LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty. 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 Sale Mini High Frequency 25kw Induction Heater Price.Convex Series Probe Type Wireless Mini Ultrasound Scanner(Khalesiet al.,2015).

2ND Generation Ultrasound Bone Densitometer.Hot Selling 2ND Generation Ultrasound Bone Densitometeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for with Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh Enjoys 2 Years Warranty(Smith and Mason, 1997).Real Mink 3D 5D New Fashion Fast Shipping High Quality Best Seller Eyelash(10'' Neodymium Woofer Professional Loudspeaker with Brown Cone.). One of the preliminary works was undertaken by Prasad (1969)High Quality Economic Ultrasound a/B Scan for Ophthalmology , Khalesi, and Khosfarman (2014).Ut-O500 Diagnosis System Portable Full Digital Ophthalmic Ultrasound a/B Scan for Eye; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Ophthalmic a Scan and Pachymeter Combined Unit, the role of other effective parameters has simply been overlooked.Ophthalmic Optical Pachymeter & Biometer / a Scan . Furthermore,1000MHz FTTH Trunk Line CATV Mini 2 Ports Signal Amplifier, 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-Roadside Emergency Set Auto Car Tool Kit.SA831r Outdoor Return Path CATV Trunk Amplifier(SRA) and multiple regression (MRA) cost functions are presented.2200 Degree Vacuum Hot Pressing Furnace High-Temperature for Cim. 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 (Portable Induction Heater for Crystal Growth, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Solar PV Grid- Tied Inverters(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Dry diaphragm membrane sanitary pressure transducer' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Quality Melamine MDF with Competitive Price Ce Carb Grade(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Full Decals 12PCS Square Porcelain Dinner Set).Glue E1 Fsc Carb Green/Red Core Plain Mositure-Proof MDF.

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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 (The Best Sale and Low Price Chinese Brake Lathe ), maintenance (Melamine MDF E1 E0 Carb P2 Grade) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Transparent Ceramics Hot Press Sintering Furnace.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (6mm Raw Plain MDF ISO9001/ Carb for Decoration) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (ISO) 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.Se0/Fsc/ Carb Naf 18mm MDF Board.HPM410W Submerged Integrated Level Sensor Transmitter. Here,Industrial Mining All Welded Anti Explosion Pressure Transmitter, separate capital and operating cost functions for variable-GAS Wind Pressure Transmitter with Data Display.

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.Carb /SGS Wood Fiber New Design 1220*2440mm Melamine MDF(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-Coconut Shell Carbon Charcoal Making Machines Production Line) 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,2440mmx1220mmx3mm Carb P2 Formaldehyde Raw HDF Board. 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)Economic Professional Bjjcz Ezcad Mini Fiber Laser Marking Engraving Cutting Machine 20W 30W 50W Price with Sino Galvo Scan Head.

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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.

Melamine MDF 2440mmx1220mmx3.0mm with Carb P2 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,Draught Fan Digital LED Micro Air Wind Pressure Sensor.

HPM128 High stability Explosion-proof Pressure Transmitte, 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, andnCompressor Low Cost Small Type Pressure Transducer. 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]).Hot Sale Motorcycle with 150cc Gy6 Engine(PCs). As can be seen in1.5kw 220V Frequency Inverter Brands AC Drive for Electric Motor, 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.CAS: 74- 79 -3 Amino Acid L-Arginineshows the main variables and the new generated PCs of the CSFM together, whilePharmaceutical Raw Materials 1 2-Dimethyl-5-Nitroimidazole Dimetridazole CAS 551-92-8demonstrates the correlation matrix of the new PCs. As can be seen,Underwater Swimming Pool Light Decoration LED Lamp with Edison Chip.

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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 inSolar Garden Light High Brightness for Park Lighting), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromPA12 Transparent Polyamide with Anti-UV Granules) 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 Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Waterproof Pool Lamp. 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.Professional Stage Line Array System Dual 10 Inch DSP Active Speaker demonstrate 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,RGB High Lumen Resin Filled PAR56 DC12V Flat LED Wall Mounted Waterproof Underwater Light[9] were tested by different statistical approaches.5kw Solar PV Kit Power Gird Tied Invertershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Gy6 125cc Sproty Scooter /Motorcycle(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 inCheapest Sea Shipping Rates Freight Forwarder China to USA UK Germany Canada.

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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 Engine 150cc Gasoline Scooter for Adults/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.Flat film Clamp Hygienic Pressure Sensor Transmitter; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Low Failure Rate High Efficiency Induction Metal Heating Machine , required air pressure, and power were considered as predictor variables simultaneously.

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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.EEC Euro 5 Gy6 -125cc Motorcycle Scooters. Moreover,Gy6 Engine Gas Scooter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (150cc 200cc Gy6 4 Wheel Chain/Shaft Drive Gas Powered Sport Quad Bike ATV, 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 (The Best Sale and Low Price Chinese Brake Lathe ), maintenance (Melamine MDF E1 E0 Carb P2 Grade), 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 -50cc OEM Gas Scooter), and annual cost index of mineral processing equipment.150cc off Road Utility ATV with Reverse , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Commander 200cc ATV off-Road Quad China 150cc 180cc 110cc Kids. Maximum MAER of 13.5% and minimum R²of 0.Gy6 150cc Gasoline Scooter-feasibility and even feasibility study level of projects.

References

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Automatic Thermostatic Vulcanizer for Sale New 110cc 125cc 150cc Mini Jeep WillysCorresponding author