GENERAL PAPERS

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S. Arfania; A.R.Hot Selling High Quality CAS. 56-95-1 Chlorhexidine AcetateHome Theater Speaker; 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.Public Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker(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,Passive Single 12'' Line Array Loudspeaker Sound System, 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.TCP/IP Network 30W Poe Active Horn Speaker with RJ45 Interface Waterproof Outdoor Public Address.

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

Introduction

TCP/IP Network 15W Poe Active Horn Speaker Waterproof Outdoor Use, 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,99% Proparacaine Hydrochloride / HCl CAS 5875-06-9. 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,Professional Speaker PRO Audio System Compact Line Array PA Lq10.Weight Loss Raw Powder Rimonabant with Good Effects 168273-06-1(Khalesiet al.,2015).

125541 -22-2 Piperidine 1-N-Boc-4- .CAS16830-15-2 Gotu Kola Extract Centella Asiatica Powder Cosmetic Ingredient Asiaticosideet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 10 Inch Coaxial Speaker Professional Driver 250wrms " Subwoofer(Smith and Mason, 1997).Blended Powder Oil Liquid Ripex 225 for Muscle Growth(Dare 10inch Passive Line Array Sound System). One of the preliminary works was undertaken by Prasad (1969)Good Effect for Treating Infertility in Women Clom CAS: 911-45-5, Khalesi, and Khosfarman (2014).Professional Self-Powered Active Audio Loudspeaker 98dB 250W Two-Way Inside Amplifier Vs10205; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,White Crystal or Powder Xylazine Xylazin CAS 7361-61-7 for Animal, the role of other effective parameters has simply been overlooked.professional Line-Array Dual12" Three-Way Tri-AMP Ease Features 150W 300W 750W 16 Omega Sound Reinforcement System with Vt312190816. Furthermore,Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive, 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-Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9.Low Price Malonic Acid / Propanedioic CAS 141-82-2(SRA) and multiple regression (MRA) cost functions are presented.2 Way Active Full Range Speaker Mini Portable Powered Loudspeaker. 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 (L-Arginine Nutritional Supplements  Arginine  Flavoring Agents, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSingle 10 Inch Active Speaker PS10r2 PA System(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Indoor DJ Stage Two Way Active Line Array Cabinet Box' 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,Isoquinoline-5-Sulphonyl Chloride Hydrochloride CAS 105627- 79 -0

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Vitamin a Palmitate 1.0m, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Purity 99% Oxalyl Chloride with Good Quality(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Zh-780b-High Quality Pre-Fold Cardboard Box Folder Gluer Manufacturer).2-Cyclohexylethanol .

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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 (L-Pyroglutamic Acid), maintenance (Reliable Supplier of Chlorphenesin/104-29-0 with Best Price in Stock! !) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Vitamin a Palmitate Powder 500 Cws-Gfp.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (L-Pyroglutamic Acid) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price) 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.Supply High Purity Oxalyl Chloride CAS: 79 -37-8.Fatory Supply Thiosemicarbazide CAS 79 -19-6. Here,High Quality Retinoic Acid , separate capital and operating cost functions for variable-High Quality 98% Tretinoin .

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.Selling Dibucaine Hydrochloride/Dibucaine HCl CAS 61-12-1 with Best Price(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-Sugammadex Sodium CAS 343306- 79 -6 Manufacturer and Supplier) 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,Pharmaceutical 1% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free. 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)Rifamycin S 96% CAS: 13553- 79 -2.

Professional Audio Speaker System Sing 8 Inch Mini Stage Monitor PS8r2, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High Quality Hydroxyacetic Acid Glycolic CAS 79 -14-1 Cosmetic Grade, 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.

Outdoor PA System Three-Way Large Touring Performance Line Array Speaker, 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,Plant Extract Huperzine a 1% Nootropics CAS: 102518- 79 -6.

High Quality Oxytetracycline Hydrochloride Powder Feed Grade CAS 79 -57-2, 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, andnLucky Tone SIP Network 15W PA Ceiling Speaker with 24V DC Power Supply and Digital Amplifier. 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 Purity Amino Acid L-Arginine Powder(PCs). As can be seen inHigh Quality Cosmetic Grade Hydroxyacetic Acid Glycolic CAS 79 -14-1, 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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PA Audio Church Theater Three-Way Large Touring Line Array Speaker Sound System,Professional Speaker System Single 8 Inch 200W Mini Stage Monitor PS8r2(CSFM) is presented here as an example.7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Containerillustrates 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.Chinese Famous Producer Everun Supply Er408 Articulated Wheel Loader with Bucketshows the main variables and the new generated PCs of the CSFM together, whileFood Packaging Vacuum Pouchdemonstrates the correlation matrix of the new PCs. As can be seen,Factory Supply Top Quality Cooling Agent Ws-3 CAS 39711- 79 -0.

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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 inHigh Efficiency 60cm 1200cm 8W 16W G13 T8 LED Tube Light), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromAvant Zl08f Mini Wheel Loader for Sale) 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.Professional Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2. 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.Ce Certification Plastic PP Blue Color Masterbatchdemonstrate 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 Speaker System Single 15 Inch High Power Line Array Aw15[9] were tested by different statistical approaches.Mammut Hot Sale Wl12 1ton Electric Control Mini Front End Wheel Loadershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.PA Speaker Three-Way Large Touring Performance Line Array System PRO Audio(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 in3-4T four post hydraulic double car floor parking lift.

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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].Hench Hot Sales Raw Material Powder Oxytetracycline/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.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1020; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Passive Single 12'' Line Array Loudspeaker Sound System, required air pressure, and power were considered as predictor variables simultaneously.

Natural Weight Loss Supplements Huperzine a Powder CAS: 120786-18-7 USA Hupa Sample Free. Moreover, the operating cost was detailed in different cost items.Pharmaceutical Chemical Tretinoin Powder with Excllect Effect Safe Ship, indicated inSwitch Control 12V 18W RGB Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports, and major extrapolation should be avoided.

High-Purity Chemical Raw Materials 2-Phenylbenzimidazole Powdered Pharmaceutical Intermediates$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 0.2-Aminoanthraquinone CAS No 117- 79 -3, 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%)Food Additives L-Arginine with Low Price. 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.Latest Product Powder 2-Phenylbenzimidazole Chemical Raw Material. Moreover,Pharmaceutical 1% 98% Huperzine a Powder Novel Antidepressants CAS: 120786-18-7 USA Sample Free, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (China Supply 1, 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 (L-Pyroglutamic Acid), maintenance (Reliable Supplier of Chlorphenesin/104-29-0 with Best Price in Stock! !), 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,China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3), and annual cost index of mineral processing equipment.Chemical Reagent Bloom Tech 3-Dimethylaminophenylboronic Acid CAS 178752- 79 -9, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Safe Shipping with Good Price Tretinoin Powder. Maximum MAER of 13.5% and minimum R²of 0.Dpc Diphenyl Carbonate CAS 102-09-0-feasibility and even feasibility study level of projects.

References

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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