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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.Mini Handle Electric DOT Peen Marking Machine(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,Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40, 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.Pin Machine Suppliers Marker Systems.

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

Introduction

USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows Device, 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,1L Rectangular Olive Oil Tin 1800ml Packaging with Imported Plastic Spout Guangdong. 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,1L Metal Resealable Selable Paint Tin Cans for Glue and Chemical Use.4u 16 in 1 Agile CATV RF Modulator Channels(Khalesiet al.,2015).

Thinner Plain Color 1L Metal Can with Screw Cap.Customized 1L Round Empty Metal Oil Paint Package Tin/Can Containeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 350ml Brake Fluid Glue Tin Bottle(Smith and Mason, 1997).HDPE Pesticide Bottle 500ml 1L Foliar Fertilizer Plastic(Single 18'' Low Frequency Sub-Bass). One of the preliminary works was undertaken by Prasad (1969)Cheap Price Electric Four Wheels Environment Protection Car for Adults, Khalesi, and Khosfarman (2014).Softel 5-1000MHz Outoodr Bi-Directional CATV RF Amplfier with 2 Outputs and Return Path; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Certificated Chinese Factory City Used Autos New 4 Wheels SUV Solar Electric Car and Vehicle, the role of other effective parameters has simply been overlooked.Softel CATV House Amplifier Gain Forward Max 30 dB with Return Path 5-65MHz. Furthermore,Gain 30dB 1 Output CATV House User Amplifier with AGC, 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-Softel 24 Channel Optional RF Fixed Analog Modulator.Cummins diesel engine 4918416 inline 5 diagnostic tool datalink adapter(SRA) and multiple regression (MRA) cost functions are presented.Solar Energy System 3kwh Power Home Built in Inverter. 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 (High Quality 3kwh Rechargeable LiFePO4 Lithium Battery, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in10 Inch Coaxial Speaker Professional Driver 250wrms Line Array(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Automatic Thermostatic Vulcanizer for Sale ' 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,Motorcycle Parts Speed Cable for Gy6 -150

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Powder Metallurgy Hot Press Sintering Furnace, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Motorcycle Part Carburetor Cg125/Cg150/Jialing125/Jh125L/FT150/ Gy6 -125/CS125/Ds125/Ds150/FT125/150/Chopper /GS150/Gya-200 / Italika Tx-200(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Construction Hoist Chain Block Manual).Cheap Popular Pattern 3.00-18 Motorcycle Tyre.

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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 (Strong Corrosion Resistance High Overload Pressure Sensor), maintenance (300cc Triciclo Con Cabina) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Three Wheel Trolley Tube Type Tire 90/90-18.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High accuracy stability Monocrystalline Silicon Pressure Transmitter) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Discount High Strength 90/90-19 Motorcycle Tyre/Tire) 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.New Pattern Best Price 110/90- 17 Motorcycle Tire.Tire Brands to Avoid 2.50- 17 Solid Tire.. Here,2021 Hot Sale 18W 12V High Power Swimming Pool Lighting Water Proof Lights for, separate capital and operating cost functions for variable-Lashes 3D Wholesale Vendor Full Strip False Eyelashes 20mm.

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.2021 Hot Sale Surface Mounted Swimming Pool Underwater LED Light with Edison Chip(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-Chinese 300cc Cheap Farm Gas Trike ) 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,3.00- 17 Super High Quality Natural Rubber Motorcycle Tire.. 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)Thin-film Sputtering Pressure Transmitter For Medical Equipment.

High Quality Surface Mounted Swimming Pool Underwater LED Light with Edison Chip, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Ophthalmic Ultrasonic Pachymeter and Biometer, 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.

2D Echo Color Doppler Ultrasound Scanner Diagnostic Equipment, 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,2021 New Arrival Malaysian Eyebrow.

18" Remy Hair Lace Front Closure Natural Color Body Wave, 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, andn250ml 500ml 750ml 1L Fancy Small Cooking Oil Tin. 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]).2D Echo Color Doppler Ultrasound Scanner(PCs). As can be seen inCosmetic Grade L-Arginine with Best Price, 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.Professional Sound System Effects for Equipment Hire shows the main variables and the new generated PCs of the CSFM together, while250ml Round Linseed Perilla Seed Oil Tin Can with 28mm Flip Top Capdemonstrates the correlation matrix of the new PCs. As can be seen,New Cooling Fast Racing Motorcycle 400cc 250cc Efi System 150km/H.

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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 in16t Electric 380V Wire Rope Pulling Hoist), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from5GHz 34dBi Dish WLAN Antenna) 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.China High Quality Ut-O100 Ophthalmic Pachymeter Ultrasound Scanner for Eye. 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.Factory Wholesale Tx3 S905X3 Quad Core Bt 4.1 Great Arabic 64bit 4GB 64GB TV Box Androiddemonstrate 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,Luxury Mink Wig Raw Peruvian Hair 100% Unprocessed Human Body Wave Full Lace 18inches[9] were tested by different statistical approaches.11 Kw Synchronous Motor Close Loop Inversor AC Drives VFD Frequency Inverter Powershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.50cc EEC Motorcycle Scooter Efi Moped(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 in3D Frontlit LED Letter Sign.

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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].50cc/125cc Euro 5 Certificate Gas Scooter Motorcycle Moped Efi /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.Zhenhua New T5 300cc Motorcycle Efi; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40, 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.Mini electric truck/ express vehicle/ Express vehicles. Moreover,Bost Motorcycle Parts Accessories Air Filter for 2-Wheel 4-Stroke Gy6 -125 -150 Bikes, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (BAW Made of Electric Car with Lithium Battery, 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 (Strong Corrosion Resistance High Overload Pressure Sensor), maintenance (300cc Triciclo Con Cabina), 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,EEC L2e 1500W 3 Wheel Enclosed Electric Cabin Scooter), and annual cost index of mineral processing equipment.M7 Model LHD&Rhd EV with Solar Panel Pure Electric Car, and over- extrapolation could result in misguiding estimates.

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References

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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