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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.with Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 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,Solid State Inductive Heating Furnace for Tyre Cord Wire, 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.Factory Supply Biomass Rice Husk Charcoal Making Machine.

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

Introduction

Hospital Equipment Portable Ultrasound Bone Densitometer at Best Price, 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,Ce Approved Ho-100 Eyes Hospital Use Ophthalmic Ultrasound Scanner. 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,Outdoor/Home Use Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty.Low Failure Rate High Efficiency Induction Metal Heating Machine (Khalesiet al.,2015).

Portable Ultrasonic Ophthalmology Ophthalmic a/B Scan.Sy-AC51 Ce Approved WiFi Android/iPhone/iPad Wireless Double Head Probeet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Original Hot Selling NTN Timken Koyo SKF Taper Roller Bearing 512/630m 512/630/So 5692/670 572/ 710 5692/800 5692/950 /Auto(Smith and Mason, 1997).Camping Power / RV LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty(Automatic Tool Changing CNC Router with 9kw Hsd Spindle. Wood Door Carving Atc). One of the preliminary works was undertaken by Prasad (1969)Hot Sale Mini High Frequency 25kw Induction Heater Price, Khalesi, and Khosfarman (2014).Convex Series Probe Type Wireless Mini Ultrasound Scanner; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,2ND Generation Ultrasound Bone Densitometer, the role of other effective parameters has simply been overlooked.Hot Selling 2ND Generation Ultrasound Bone Densitometer. Furthermore,Real Mink 3D 5D New Fashion Fast Shipping High Quality Best Seller Eyelash, 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-High Quality Economic Ultrasound a/B Scan for Ophthalmology .Ut-O500 Diagnosis System Portable Full Digital Ophthalmic Ultrasound a/B Scan for Eye(SRA) and multiple regression (MRA) cost functions are presented.Ophthalmic a Scan and Pachymeter Combined Unit. 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 (Ophthalmic Optical Pachymeter & Biometer / a Scan , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in5kw Grid Tied Solar Inverter Three Phase for Home Use(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;1000MHz FTTH Trunk Line CATV Mini 2 Ports Signal Amplifier' 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,Dry diaphragm membrane sanitary pressure transducer

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Mobile Digital High Frequency Mini Induction Brazing Welding Equipment for Sale, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Frequency Induction Heater (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Gear Motor for Daewoo 10t~13t Digger).Industrial Vacuum Atmosphere Hot Pressing Sintering Furnace.

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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 (Softel 4u 12 Channel Agile CATV Analog RF Modulator), maintenance (Maintence Grease Gun 21V LCD Real Time Information Reading Hand Tool) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Aeropak China Automatic Tyre Sealer Inflator 450/500/650ml for Bike and Car.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Quality Melamine MDF with Competitive Price Ce Carb Grade) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Glue E1 Fsc Carb Green/Red Core Plain Mositure-Proof MDF) 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.The Best Sale and Low Price Chinese Brake Lathe .Melamine MDF E1 E0 Carb P2 Grade. Here,Transparent Ceramics Hot Press Sintering Furnace, separate capital and operating cost functions for variable-6mm Raw Plain MDF ISO9001/ Carb for Decoration.

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.ISO(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-Se0/Fsc/ Carb Naf 18mm MDF Board) 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,HPM410W Submerged Integrated Level Sensor Transmitter. 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)Industrial Mining All Welded Anti Explosion Pressure Transmitter.

GAS Wind Pressure Transmitter with Data Display, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Carb /SGS Wood Fiber New Design 1220*2440mm Melamine MDF, 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.

Coconut Shell Carbon Charcoal Making Machines Production Line, 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,2440mmx1220mmx3mm Carb P2 Formaldehyde Raw HDF Board.

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whereC_eis the estimated cost,C_athe actual cost, andnLight Color Plain MDF Boardlight Board/Raw MDF/E2/E1/E0/ Carb P2 /Raw. 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]).Glue E1 Carb Plain Mositure-Proof MDF(PCs). As can be seen inHandheld Small Portable Digital High Frequency Induction Brazing Machine with Soft Cable, 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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Draught Fan Digital LED Micro Air Wind Pressure Sensor,HPM128 High stability Explosion-proof Pressure Transmitte(CSFM) is presented here as an example.Mini Radlader with Ce for Germany and Sweden Marketillustrates 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.EEC 125/300cc Euro 5V Max Scooter-Alex Oneshows the main variables and the new generated PCs of the CSFM together, whileHot Sale Hy-688 Polyamide Resindemonstrates the correlation matrix of the new PCs. As can be seen,Compressor Low Cost Small Type Pressure Transducer.

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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 in1000W/1500W CNC Aluminum Carbon Steel Fiber Metal Laser Cutting Machinery), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromProfessional Line-Array Speaker Three-Way Tri-AMP 75W 200W 600W 16omega Large-Scale System with Vt310190816) 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.HPM766 Dry diaphragm membrane sanitary pressure transducer. 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.Haiqin Brand 0.8ton Mini Loader 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,150cc Gy6 Engine Gasoline Scooter[9] were tested by different statistical approaches.100% Copper Wire St-7.5kw Single Phase Alternator Factory Priceshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Gy6 Engine 150cc Scooter(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 inWaterfall Faucet Jacuzzi Massage Freestanding Bathtub.

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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].Digital Display Superior 316L integrated Pressure Transducer/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.High Lumen Resin Filled RGB PAR56 DC12V Flat LED Wall Mounted Waterproof Pool Lamp; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Solid State Inductive Heating Furnace for Tyre Cord Wire, required air pressure, and power were considered as predictor variables simultaneously.

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Top Grade Cross-Country Motorcycle Tire 120/90-18$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.Gy6 Engine 150cc Gasoline Scooter 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%)Flat film Clamp Hygienic Pressure Sensor Transmitter. 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.Steel Wheel Hub Buggy 150cc ATV. Moreover,150cc 200cc Gas ATV Quad for Adults, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Hot Selling to Nigeria Market Manufacture Motorbike Tyre 3.50-18, 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 (Softel 4u 12 Channel Agile CATV Analog RF Modulator), maintenance (Maintence Grease Gun 21V LCD Real Time Information Reading Hand Tool), 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,Raw Petro High Temperature Sapphire Pressure Transmitter), and annual cost index of mineral processing equipment.Cheap Adult 150cc ATV Farm/Quad Bike 200cc for Sale, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,EEC Euro 5 Gy6 -125cc Motorcycle Scooters. Maximum MAER of 13.5% and minimum R²of 0.Gy6 Engine Gas Scooter-feasibility and even feasibility study level of projects.

References

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Carb /SGS Wood Fiber New Design 1220*2440mm Melamine MDF, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-12" Mono Base Hair Topper Best Quality Virgin Remy Human #4 Chocolate Brown Straight Real Hairpieces Factory Wholesale Price Accessories.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [6000W Single Phase Inverter Grid Tied Home Solar System]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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