GENERAL PAPERS

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S. Arfania; A.R.Chassis/Dolphin/Powerful Speaker for StadiumFlame Retardant Ammonium Polyphosphate ; 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.Line Array with Accessories for PRO Audio(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,Wholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery, 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.Kara Line Array Speakers Double 8 Inch Concert.

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

Introduction

Top Quality Isopropyl Alcohol , 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,Disco Sound+ PA System Speaker. 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,99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre Fast Delivery.High Quality Chloramphenicol CAS 56-75-7 China Factory Supplier(Khalesiet al.,2015).

High Quality 99% CAS 16595-80-5 Levamisole Hydrochloride.N- et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Carb P2 Plywood/EPA Plywood /Okoume(Smith and Mason, 1997).Kara Double 8 Inch Liner Speaker System Professional Audio Equipment(Vrx932 Horn Line Array Professional Manufacturer). One of the preliminary works was undertaken by Prasad (1969)Raw Material Anti Epilepsy Topiramate Powder with Best Price, Khalesi, and Khosfarman (2014).Dual 12 Inch Powered Line Array Active Sound System W-210bp; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Quality CAS 16595-80-5 Levamisole Hydrochloride/ HCl, the role of other effective parameters has simply been overlooked.Levamisole Hydrochloride/ HCl Powder CAS 16595-80-5. Furthermore,Pain Relleving Patch Topical Lidocaine Spray137-58-6 UK Warehouse Free Sample, 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-Kas DJ Speaker Dual Line Array 18 Inch Subwoofer.Mini Speaker Line Array Wedding Decoraions DJ Mixer(SRA) and multiple regression (MRA) cost functions are presented.8 Ohm PRO Audio DJ Mixer Live Sound System. 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 (Professional Stage Line Array System Dual 15'' Self-Powered Speaker, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWireless Headphone Tws Bluetooth Earphone for Phone(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;High Purity Valerophenone 1-Phenylpentan-1-One CAS 1009-14-9' 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,Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Price

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Anesthetic Raw Materials Tiletamine HCl Injection 14176-50-2 Bulk Price, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),High Quality Nootropics Noopept CAS 157115-85-0 Best Price(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Retail Easy Clean Moistureproof Loose Lay PVC Vinyl Flooring 3.5mm).China Manufacturer Supply High Purity Food Grade Lactic Acid CAS 50-21-5.

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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 (2021 Hot-Sale Lt12 Dual 12" Concert Line Array System), maintenance (Line Array of Parts for PRO Audio Speaker) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Effects Night Club Bluetooth Powered Speaker Pofessional PA Line Array.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Reliability DSP Active Professional Line Array Speaker ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Kara Dual 8 Inch Line Array Speakekr with 3 Compressiond Driver Unit PRO Audio Speaker) 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.Professional Audio Line Array Speaker Neodymium Crossover System.Line Array System with Parts for PRO Audio Speaker . Here,Dual 12 Inch Top Passive Line Array Speaker and Single 18 Sub System, separate capital and operating cost functions for variable-Power Amplifier Module Board + Made in China 400 Watt AMP.

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.Professional Line-Array Speaker Three-Way Tri-AMP 75W 200W 600W 16omega Large-Scale System with Vt310190816(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-Tp01 Piezo Electric Dome Tweeter) 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,Line Array of Parts for PRO Audio Speaker . 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)Line Array with Accessories for PRO Audio .

Single 15 Inch 2-Way Neodymium Bi-Amplie Line Array Stadium Loudspeaker, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Bulk Supply Veterinary Tranquilizer Tiletamine Xylazine Powder 14176-50-2, 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.

Tg01 1 Inch Silk Dome Tweeter, 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,Professional Speaker Compective PRO Audio .

Double 12inch Active Coaxial 29kg Line Array Speaker System, 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, andnFree Shipping 99% Tranquilizer Powder Tiletamine HCl 14176-50-2 NMDA Receptor. 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]).Purity 75% Colorless Transparent Liquid Isopropyl Alcohol Disinfectant(PCs). As can be seen inDyed Natural Wood Veneer Oak Crown Cut for Hotel Decoration Shop Wall Kitchen Cabinet, 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.portable Fiber Laser Marker Machine for Eyeglasses Case Accessoriesshows the main variables and the new generated PCs of the CSFM together, whileShower Enclosure/ Cabin/ Glass Sliding Door for Bathroom: Quadrant Enclosure AS3912T-90demonstrates the correlation matrix of the new PCs. As can be seen,2-Carboxybenzaldehyde/Phthalaldehydic Acid CAS 119-67-5.

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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 inStandalone Access Control / RFID Keypad Reader Waterproof), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromPowered Speaker System for Home Theater) 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.Live Music Sound Line Array System for Acoustic and Electronic Performance. 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.Commander 200cc ATV off-Road Quad China 150cc 180cc 110cc Kidsdemonstrate 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,PA System Passive ABS 100V 8ohm 10W Wall Mount Horn Speaker Waterproof for Outdoor Use[9] were tested by different statistical approaches.Natural Okoume Venner 0.90mmx6X9FTshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.900watt Amplifier Moudel Borad Chinese Class -D(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 inModern Customized Shape Rectangular Acrylic Freestanding Bathtubs.

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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].100% Passing Customs Local Anesthetic Drugs Procaine for Pain Release/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.Factory Supply Best Price Fusidine/ Fusidic Acid Powder CAS: 6990-06-3; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Wholesales Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery, required air pressure, and power were considered as predictor variables simultaneously.

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Gamma-Aminobutyric Acid GABA CAS: 56-12-2 with Best Price$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.Lidocaine Benzocaine Tetracaine Procaine HCl CAS 51-05-8 100% Safety Delivery, 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%)Hot Sale Professional Loudspeaker PRO Audio . 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.Free Sample Bulk Stock Procaine South America Warehouse CAS: 51-05-8. Moreover,High Quality with Good Price Oxytetracycline HCl Powder, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Chinese Factory for Vitamin a Palmitate 0.25miu Powder, 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 (2021 Hot-Sale Lt12 Dual 12" Concert Line Array System), maintenance (Line Array of Parts for PRO Audio Speaker), 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 Top Local Anesthetic Exporter Bulk Sales Procaine CAS: 51-05-8), and annual cost index of mineral processing equipment.Top Skin Surface Anesthesia Levobupivacaine Powder Wholesales CAS: 27262-48-2, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality and Purity Raw Material Supplier Xylazine HCl CAS 23076-35-9 with Best Price. Maximum MAER of 13.5% and minimum R²of 0.Professional Active Line Array Loudspeaker Low Frequency Coaxial 12-Inch Neodymium Speaker-feasibility and even feasibility study level of projects.

References

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Mular, A.L. 1982.Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer.30W Dante Wall Speaker with External 24V DC Power Supply Dp 430.Kas 12 3 Way Sound System Line Array PRO Speakers with Subwoofer, Montreal. 265 pp.         [2021 Most Hot Selling Electric Mope E-Motorcycle 500W- 800W]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer.Rental Application Stage Monitor Audio&Sets.Kas 12 3 Way Sound System Line Array PRO Speakers with Subwoofer, Montreal. 319 pp.         [1L Beer Can]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Local Anesthetic Levobupivacaine Powder Brazil Free Sample 27262-48-2.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Plastic Purple Color Masterbatch]

Noakes, M. and Lanz, T. 1993.Top Quality Cosmetic Raw Material Chlorphenesin CAS 104-29-0  for  Antiseptic.White Crystalline Powder Painkiller Levobupivacaine Skin Surface Anesthesia CAS: 27262-48-2, Carlton, victoria. 412 pp.         [Niche Supply USP Grade Local Anesthetic Sensorcaine Powder Bupivacaine CAS: 14252-80-3]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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