GENERAL PAPERS

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S. Arfania; A.R.Experienced Supplier with Safe Clearance Fast Delivery BMK Glycidate PmkSpeaker Wall Bracket White/Black ; 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.Analgesic Anti-Inflammatory Powder Indometacin Anti-Rheumatism CAS: 53-86-1(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,Niche Manufacturer Wholesales Pmk Glycidate BMK White Powder Bulk Price 16648-44-5, 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.Hot Sell Isopropyl Alcohol 99.9%.

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

Introduction

Speaker Wall Bracket White/Black , 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,High Security Door Peephole Eyes Viewer DV3828b . 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,Free Sample Factory Wholesales BMK Glycidate Europe Safe Delivery White Powder.Professional Column Speaker Line Array Full Range Loudspeaker Multi-Function L3(Khalesiet al.,2015).

Clear Colorless Liquid Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery.White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmket al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Nylon 12/Nylon Granules/Polyamid 12/Transparent Glasses Frame(Smith and Mason, 1997).Factory Supply BMK White Powder Oil Eurore Warehouse Fast Delivery CAS: 5413-05-8(Kinetin; CAS No: 525- 79 -1; 6-Furfurylaminopurine; 6-Kt). One of the preliminary works was undertaken by Prasad (1969)Methyl 2-Bromovalerate CAS 19129-92-1 with Safety Delivery, Khalesi, and Khosfarman (2014).Factory Price Diethyl 2; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery, the role of other effective parameters has simply been overlooked.Compact Two-Way 4'' 6'' 8'' 100V/16-Ohm Loudspeaker with Multi-Tap Transformer. Furthermore,Factory Supply Dimethyl 2, 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% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre USA T-Butyrolactone Fast Delivery.Overseas Warehouse Fast Delivery Organic Chemicals (SRA) and multiple regression (MRA) cost functions are presented.China Ethyl 2-Bromovalerate Liquid CAS 615-83-8. 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 (Supply Procaine Hydrochloride China Top Factory Supplier Base Manufacturer Aoks, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChina Suppliers Alone Type Wraped Beam Disc Machenism Padlock(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Factory Supply Ethyl Valerate CAS 539-82-2' 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,Vera12 Single 12" The Most Economical Line Array Sound System

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Customized Metal 3D Cat and Mouse Logo Brooch Blank Enamel Badge Lapel Pin).Alu. Speaker Mount Wall Bracket .

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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 (Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTV), maintenance (High Quality 8'' Coaxial Audio Speaker for Long Throw Distance) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Wall Mount Speaker Bracket .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Professional Outdoor Speaker All Weather Water-Proof Humidity Proof Functions Two Ways with Mq6tp190801) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Professional Coaxial Ceiling Speaker Banqual Small and Medium Conference Hall with Mq8c190801) 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.Waterproof Loudspeaker Wall Mounter 8inch Lt208/Lt208t.Wireless PA System for Classroom and Church. Here,All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf, separate capital and operating cost functions for variable-Steel PRO Audio Speaker Back Plate .

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.Hop Quality and Competitive Price Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa(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-Single 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730) 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,Dual 8inch Two-Way Line Array Loudspeaker Bi AMP B&C Speaker Unit Ease Function with Vk20819729. 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)All-Weather Compact 2-Way Coaxial Loudspeaker with 6" Lf.

Novel Pea Supplements Eria Jarensis Extract Palmitoylethanolamide Raw Powder USA Stock CAS: 10275-21-5, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Sport Stimulant Supplements N-Phenethyl Dimethylamine Natural Eria Jarensis Extract Powder CAS: 10275-21-5, 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.

Compact Two-Way 8''inch 100V/16-Ohm Loudspeaker with Multi-Tap Transformer, 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,Speaker PS10.

30W PA Active Computer 5.1 System Inexpensive 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, andnSteel Speaker Cabinet Top Hat with M20 Thread Inside . 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]).Big Subwoofer Line Array Speaker (PCs). As can be seen inFrequency Converter for Water Pump, 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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Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s,Two-Way Full Range 1000W Professional Power Speaker(CSFM) is presented here as an example.VFD Air Compressor Asynchronous Variable Frequency Driveillustrates 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.Dual 10 " Compact Speaker Line Array shows the main variables and the new generated PCs of the CSFM together, whileGt1544sm 733783-5007s Turbo for Volkswagen Fox 1.4L Tdi Engine Bnmdemonstrates the correlation matrix of the new PCs. As can be seen,CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical.

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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 inConcrete Block Making Machine in Dhaka Bangladesh), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromQuad Core Media Player Mxq PRO S905W Android Best Kodiiptv Set Top Box TV with SIM Card Slot) 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 Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149. 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.No Foldable 40-60km Range Per Charge EEC Electric Scooterdemonstrate 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,Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouse[9] were tested by different statistical approaches.Alcohol Solvent Polyamide Resin for Paper Gravure Printing Inkshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical(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 inFactory Price Hot Sell Super Absorbent Adult Diaper Pull up Pant.

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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].Single 5"Two-Way Full-Range Loudspeaker Small Scale Indoor with Tx5c/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.High Qualty Line Array Loudspeaker; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Niche Manufacturer Wholesales Pmk Glycidate BMK White Powder Bulk Price 16648-44-5, required air pressure, and power were considered as predictor variables simultaneously.

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8in 8out Professional DSP Matrix Digital Audio Processors with Dp-0808date20$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.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1220, 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%)New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx820. 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.Recording Studio Equipment Vera Series Super Power Speaker Box. Moreover,New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx620, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Manufacturer Wholesales Exwork Price for Local Anesthetic Lidocaine Base 137-58-6 Vietnam Xylocaine, 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 (Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTV), maintenance (High Quality 8'' Coaxial Audio Speaker for Long Throw Distance), 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,1800W 103dB Bass Professional Passive Subwoofer Dual 18inch with Wa21820), and annual cost index of mineral processing equipment.Line Array Horn of Professional Audio 170L*160W*140h 1" , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Single 18'' Low Frequency Sub-Bass. Maximum MAER of 13.5% and minimum R²of 0.Professional Loudspeaker 18 Inch Active Subwoofer DSP Function with Wa118SA-feasibility and even feasibility study level of projects.

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Mular, A.L. 1982.Small Column White Color Church Conference Room Speaker.Arc Shaped Column Speaker for Restaurant and Shopping Mall.Peq-18SD1 18'' Bass Reflex Active Powerful Subwoofer, Montreal. 265 pp.         [Bulk Supply Veterinary Tranquilizer Tiletamine Xylazine Powder 14176-50-2]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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