GENERAL PAPERS

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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.Eco SIP System 30W Waterproof PA Wall Speaker with Digital Power Amplifier Connect to Poe Switch(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,Hot Selling High Quality CAS. 56-95-1 Chlorhexidine Acetate, 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.Public Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker.

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

Introduction

Passive Single 12'' Line Array Loudspeaker Sound System, 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,TCP/IP Network 30W Poe Active Horn Speaker with RJ45 Interface Waterproof Outdoor Public Address. 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,TCP/IP Network 15W Poe Active Horn Speaker Waterproof Outdoor Use.99% Proparacaine Hydrochloride / HCl CAS 5875-06-9(Khalesiet al.,2015).

Professional Speaker PRO Audio System Compact Line Array PA Lq10.Weight Loss Raw Powder Rimonabant with Good Effects 168273-06-1et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Best Price Food Tin Metal Box Clip Lid Candy Can(Smith and Mason, 1997).125541 -22-2 Piperidine 1-N-Boc-4- (Home Theater Speaker). One of the preliminary works was undertaken by Prasad (1969)CAS16830-15-2 Gotu Kola Extract Centella Asiatica Powder Cosmetic Ingredient Asiaticoside, Khalesi, and Khosfarman (2014).Blended Powder Oil Liquid Ripex 225 for Muscle Growth; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Good Effect for Treating Infertility in Women Clom CAS: 911-45-5, the role of other effective parameters has simply been overlooked.Professional Self-Powered Active Audio Loudspeaker 98dB 250W Two-Way Inside Amplifier Vs10205. Furthermore,White Crystal or Powder Xylazine Xylazin CAS 7361-61-7 for Animal, 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-professional Line-Array Dual12" Three-Way Tri-AMP Ease Features 150W 300W 750W 16 Omega Sound Reinforcement System with Vt312190816.Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive(SRA) and multiple regression (MRA) cost functions are presented.Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9. 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 (Low Price Malonic Acid / Propanedioic CAS 141-82-2, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDare 10inch Passive Line Array Sound System(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;2 Way Active Full Range Speaker Mini Portable Powered Loudspeaker' 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,Lucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public Address

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Glycine Methyl Ester Hydrochloride , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Isoquinoline-5-Sulphonyl Chloride Hydrochloride CAS 105627- 79 -0(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (10oz Heart Handle Sublimation Mug).Vitamin a Palmitate 1.0m.

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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 Purity 99% Oxalyl Chloride with Good Quality), maintenance (2-Cyclohexylethanol ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,L-Pyroglutamic Acid.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Reliable Supplier of Chlorphenesin/104-29-0 with Best Price in Stock! !) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Vitamin a Palmitate Powder 500 Cws-Gfp) 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.L-Pyroglutamic Acid.China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price. Here,Supply High Purity Oxalyl Chloride CAS: 79 -37-8, separate capital and operating cost functions for variable-Fatory Supply Thiosemicarbazide CAS 79 -19-6.

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.High Quality Retinoic Acid (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-High Quality 98% Tretinoin ) 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,Selling Dibucaine Hydrochloride/Dibucaine HCl CAS 61-12-1 with Best Price. 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)Sugammadex Sodium CAS 343306- 79 -6 Manufacturer and Supplier.

Pharmaceutical 1% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Rifamycin S 96% CAS: 13553- 79 -2, 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.

Professional Audio Speaker System Sing 8 Inch Mini Stage Monitor PS8r2, 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,High Quality Hydroxyacetic Acid Glycolic CAS 79 -14-1 Cosmetic Grade.

Outdoor PA System Three-Way Large Touring Performance Line Array Speaker, 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, andnPlant Extract Huperzine a 1% Nootropics CAS: 102518- 79 -6. 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]).High Quality Oxytetracycline Hydrochloride Powder Feed Grade CAS 79 -57-2(PCs). As can be seen inPC/PMMA/GPPS Optical Plate/Board Extrusion Making Machine/Extruder, 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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High Purity Amino Acid L-Arginine Powder,Potassium 2(CSFM) is presented here as an example.Wolf Wl80 Mini Dumper Euro 5 Loader for Saleillustrates 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.7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Containershows the main variables and the new generated PCs of the CSFM together, whileChinese Famous Producer Everun Supply Er408 Articulated Wheel Loader with Bucketdemonstrates the correlation matrix of the new PCs. As can be seen,PA Audio Church Theater Three-Way Large Touring Line Array Speaker Sound System.

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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 inRectangular Freestanding Acrylic Bathtub Reinforced by FRP for USA Europe), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromMassage Bathtub) 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.Factory Supply Top Quality Cooling Agent Ws-3 CAS 39711- 79 -0. 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.Diesel Engine Parts Fuel Injection Nozzle Dlla149sm304demonstrate 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,Professional Audio Speaker Active Single 8 Inch Mini Stage Monitor PS8r2[9] were tested by different statistical approaches.Ce Certification Plastic PP Blue Color Masterbatchshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Professional Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2(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 inFashion Wholesale Business Backpack Password-Lock Water-Resistant Outdoor School Teenager Travel Laptop Backpacks Man.

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Cost model for variable-Professional Speaker System Single 15 Inch High Power Line Array Aw15

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].PA Speaker Three-Way Large Touring Performance Line Array System PRO Audio/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.Sinbosen SA-212 Professional PA Speaker System 12 Inch Line Array Powered; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Hot Selling High Quality CAS. 56-95-1 Chlorhexidine Acetate, 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.2-Aminoanthraquinone CAS No 117- 79 -3. Moreover,Food Additives L-Arginine with Low Price, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Latest Product Powder 2-Phenylbenzimidazole Chemical Raw Material, 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 Purity 99% Oxalyl Chloride with Good Quality), maintenance (2-Cyclohexylethanol ), 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,Pharmaceutical 1% 98% Huperzine a Powder Novel Antidepressants CAS: 120786-18-7 USA Sample Free), and annual cost index of mineral processing equipment.China Supply 1, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3. Maximum MAER of 13.5% and minimum R²of 0.Chemical Reagent Bloom Tech 3-Dimethylaminophenylboronic Acid CAS 178752- 79 -9-feasibility and even feasibility study level of projects.

References

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.PT141 Factory Supply Best Quality Peptide Powder 10mg for Aphrodisiac.High-Purity Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol China Factory Direct Sales.99% Purity 1, Montreal. 319 pp.         [Professional Audio Signal 8" Two-Way Full-Range Speakers PA System with Tq8]

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USBM. 1987.40wx2 10 " Portable PS Series Party Speaker,100% CAS 79 -57-2 Oxytetracycline Powder-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [3D Car Wheel Aligner with Automotive Tracking Cameras]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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