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GS-a 12mm CATV Fixed RF AttenuatorCost modelling for flotation machines

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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.IP68 Glass 12V PAR56 LED Underwater Swimming Pool Light for Fountain(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,IP68 8W-35W Surface Mounted Multi-Color LED Underwater Swimming Light, 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.Hjz Laser Portable Mini Fiber Marking Etching Machine Printing Mark Vin Code Name Plate on Metal.

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

Introduction

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Methodology

Data

Thirty-seven major flotation machines (CE Approved Vacuum Cavitation Roller RF Velashape 3 Slimming Machine, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in2021 Cheap 60V 350W Cool Adult Electric Bike / Bicycle Motorcycle with Pedal(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;EEC EPA Extreme Adult RC Snowmobile' 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,Snow Mobile Rubber Track Gas Adult Ski Scooter

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Factory Price Home Solar Energy System 3kwh with 5 Years Warranty, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),New Design Stretch Mark Removal Beauty Machines(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Flexible COB WHITE LED Strip Lights IP65 Waterproof dimmable light lights with remote RF for party cabinet room).Powerful Snow Ski LED Lights Adult Racing a Snowmobile.

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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 (Solar Residential Wall Power Bank 3kwh LiFePO4 Rechargeablelithium Battery), maintenance (Allsparkpower 3kw/4.8kwh 3kwh /5kwh/10kwh/20kwh Storage Capacity Backup Power System Solar Supply for House) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,RF Skin Tightening Face Lifting Machine.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (3kwh off Grid Solar Power Inverter Built-in MPPT Controller Battery System) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Hot Selling Face Lifting and Slimming Chin Machine) 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.110cc 125cc 150cc 200cc Chain Drive Kids Mini Jeep UTV Car.RF Vacuum Face Lifting and Slimming Chin Machine. Here,Gas Ski Adult PRO Electric Start Snow Scooter, separate capital and operating cost functions for variable-Portable Eiminate Cellulite Jaw Lifting RF Vacuum Apparatus.

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.Skin Whitening Machine / Fractional RF(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-20MHz RF Wrinkle Removal) 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,Vacuum Shape Velashape Body Slimming SPA Equipment. 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)Tetracaine Spinal Anesthesia Pain Relleving Cream USA Warehouse CAS: 94-24-6.

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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,Globalipl Body Face Slimming Fine Jaw Line 20MHz Device.

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whereC_eis the estimated cost,C_athe actual cost, andn4seats 1500cc Kart. 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]).Fangpower 400cc 4seat Side by Dune Buggy UTV(PCs). As can be seen inPLA Color Masterbatch for 3D Printing, 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.Cosmetic Pearlescent Pigments Chameleon Color Travel T8867n Multicolor Metal Effectshows the main variables and the new generated PCs of the CSFM together, while20MHz Probe Ophthalmology Ultrasound MD-2300Sdemonstrates the correlation matrix of the new PCs. As can be seen,Stage Monitor Professional Speaker Multi-Function Hall Fill Loudspeaker All Occasions 450W with M1220.

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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 inFactory Stainless Steel Unbreakable Metal Drinking Beer Glasses Wine Tumblers), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromFrequency Converter) 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.Benzyl Benzoate Pharmaceutical Intermediates. 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.High Quality Procainamide Hydrochloride 614-39-1demonstrate 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,Single 15'' Passive/Active Subwoofer with High Quality Plywood[9] were tested by different statistical approaches.10 Inch Coaxial Speaker Professional Driver 250wrms " Subwoofershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Professional Concert Line Array Speaker System Vt4888(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 inBlack & White ~ 10mm Diameter 3m Brand Small Adhesive Hook and Loop Coins Dots.

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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].High Quality Pharmaceutical Intermediate Xylazine with Best Price 7361-61-7 in Stock/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.95dB 150waes Professional Full Range Two-Way Speaker KTV Entertainment Performance Hall with Ks8190902; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,IP68 8W-35W Surface Mounted Multi-Color LED Underwater Swimming Light, 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.Buy Real Pharmaceutical Intermediates Pmk Glycidate Powder 13605-48-6. Moreover,Three-Way Bi-AMP Coaxial Point Source Professional Column Loudspeaker 75W 400W 800W, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Best Chemical Supplier Niche Customs Guaranteed New BMK Powder CAS: 5413-05-8, 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 (Solar Residential Wall Power Bank 3kwh LiFePO4 Rechargeablelithium Battery), maintenance (Allsparkpower 3kw/4.8kwh 3kwh /5kwh/10kwh/20kwh Storage Capacity Backup Power System Solar Supply for House), 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,60W 16Ω Professional Coaxial in Ceiling Business Speaker Sound Audio System with Mq-6c190826), and annual cost index of mineral processing equipment.Factory Hot Sell High Quality Rimonabant Acomplia Fat Burning Steroid, and over- extrapolation could result in misguiding estimates.

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Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [Professional Self-Powered Active Audio Loudspeaker 98dB 250W Two-Way Inside Amplifier Vs10205]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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