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10 " PRO Sound PA Line Array Loudspeaker Audio Speaker SystemCost modelling for flotation machines

S. Arfania; A.R.Latest Product Powder 2-Phenylbenzimidazole Chemical Raw MaterialRF Skin Tightening Face Lifting Machine; 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.Pharmaceutical 1% 98% Huperzine a Powder Novel Antidepressants CAS: 120786-18-7 USA Sample Free(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,China Supply 1, 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.China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3.

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

Introduction

Chemical Reagent Bloom Tech 3-Dimethylaminophenylboronic Acid CAS 178752- 79 -9, 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,Safe Shipping with Good Price Tretinoin Powder. 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,Dpc Diphenyl Carbonate CAS 102-09-0.Bloom Tech Chemical Material Topiramate CAS 97240- 79 -4(Khalesiet al.,2015).

100% Water Soluble Vitamin a Palmitate Powder Retinyl.China Supplier of CAS 702- 79 -4 1et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Dust Collector Machine Wood(Smith and Mason, 1997).Free Sample CAS 32780-32-8 PT141 PT 141 10mg Peptide Raw Lyophilized Powder(Factory Offer Nordic Removable and Washable Livingroom Fabric Sofa). One of the preliminary works was undertaken by Prasad (1969)High Quality Aod-9604 CAS 221231-10-3 Aod 9604 Peptides 2mg for Loss Weight, Khalesi, and Khosfarman (2014).CAS 79 -57-2 Oxytetracycline; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Azd3759 CAS No. 1626387-81-2, the role of other effective parameters has simply been overlooked.Food Additives L-Arginine with Top Quality. Furthermore,Chemical Reagent Bloom Tech Sodium 4-Methylbenzenesulfinate CAS 824- 79 -3, 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-99% Purity 1.PT141 Factory Supply Best Quality Peptide Powder 10mg for Aphrodisiac(SRA) and multiple regression (MRA) cost functions are presented.High-Purity Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol China Factory Direct Sales. 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 (2-Aminoanthraquinone CAS No 117- 79 -3, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Quality Diesel Engine Parts 4 Cyl Pump Rotor Head 096400-0371(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;High Quality Tretinoin 302- 79 -4 with Good Price' 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,Vitamin a Palmitate CAS 79 -81-2

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,IP PA System 6 Inch 15W SIP Poe Ceiling Speaker with Built-in Monitoring Microphone and Dry Contact in out, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Best Price Diclofenac Sodium with High Quality(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Top Level All Sizes Customized Colors Pet Plastic Bottle).40wx2 10 " Portable PS Series Party Speaker.

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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 (100% CAS 79 -57-2 Oxytetracycline Powder), maintenance (New Arrival Mr Series Audio Mixer with DSP Mr-12fx) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Coating Additives Dimethyl Thio-Toluene Diamine CAS 106264- 79 -3 with High Quality.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Powered Speaker System for Home Theater) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Cosmetic Grade L-Arginine with High Quality) 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.320000 Iu CAS127-47-9 Retinyl Vitamin a Acetate/Retinol Acetate.Chinese Factory Special Cosmetic Raw Materials for Wrinkle Removal and Moisturizing High Purity Nano Liposomal Hydroxypropyl Tetrahydropyrantriol. Here,Best Quality Skin Care Pure Tretinoin 302- 79 -4, separate capital and operating cost functions for variable-Factory Direct Sale Dimethyl Gonane 702- 79 -4.

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.Phthalaldehyde CAS 643- 79 -8(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-Chlorhexidine Diacetate CAS No 206986- 79 -0) 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,CAS 79 -14-1 Glycolic Acid 70%. 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)Compact Neodymium Line Array 12inch 400W Passive Speaker PA System.

Professional 10 " Aluminum Speaker Basket, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (New Arrival Mr Series Audio Mixer with DSP Mr-10fx, 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.

Factory Price Powder Mannitol with High Quality, 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,Outdoor Line Array PA System Loudspeaker.

Karaoke Wireless Portable Wooden Bluetooth PA 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, andn12" Line Array Loud Speaker Sound System Professional PA. 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]).15inch Professional Stereo Sound PA PRO Audio DJ Loud Speaker(PCs). As can be seen in1L Tin Can for Oil, 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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Cosmetic Material 99% Purity Tretinoin Powder,High Quality Rasagiline Mesylate API Powder CAS 161735- 79 -1 with Purity! !(CSFM) is presented here as an example.Rompun White Crystalline Xylazine Pure Powder CAS: 23076-35-9 Europe Free Shippingillustrates 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.Wall Amplifier Bluetooth Home Theater Amplifiers Mini with 6'' in Ceiling Speaker Audio Amplificador AMP Bgm Bacground Music Host Wireless Remote Controlshows the main variables and the new generated PCs of the CSFM together, whileStraight Shank Collets C16 C20 C25 C32 Collet Chuck for Power Millingdemonstrates the correlation matrix of the new PCs. As can be seen,Spts.

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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 inFood Glass Container/ Bottle/ Glassware Wholesale), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromHigh Purity 9-Hydroxyfluorene CAS 1689-64-1 with Good Price in Stock) 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 0.2X12 Outdoor Compact Neodymium PRO Audio PA Event Line Array. 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.Active 10 " Line Array with Calss-D Amplifier and Built-in DSPdemonstrate 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,Best Price Medicine Grade Lanosterol Powder[9] were tested by different statistical approaches.Low Power Elevator Inverter 12kw with Controllershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Outdoor Professional Audio Loudspeaker PA Stage Active Line Array(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 inHandheld Portable Keratometry Keratometer.

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Cost model for variable-PRO Dante Audio 30W DSP 6 Inch Plastic Mini Active in Wall Mounted Loud Speaker Pairs Supports 24VDC or Poe Power for PA System Public Address

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].Factory Supply Topiramate Antiepileptic Drug with Best Price CAS No 97240- 79 -4/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.Cosmetic Grade L-Arginine with Best Price; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China Supply 1, required air pressure, and power were considered as predictor variables simultaneously.

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Waterproof Childproof Ziplock Valve Bag$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.Professional Sound Speaker Single 8 Inch Portable Stage Monitor PS8r2, 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%)Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetate. 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.Factory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Price. Moreover,L-Arginine Powder Amino Acid Pure Manufacturer, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (White Powder Vitamin a for Food and Feed Grade, 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 (100% CAS 79 -57-2 Oxytetracycline Powder), maintenance (New Arrival Mr Series Audio Mixer with DSP Mr-12fx), 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,Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol), and annual cost index of mineral processing equipment.Professional Line Array Speaker Neodymium Af15, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Manufacturer Supply CAS 79 -14-1 Glycolic Acid 70% 99% Cosmetic Grade. Maximum MAER of 13.5% and minimum R²of 0.Q210 Passive PA Speaker System-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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