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.Levamisole HCl / Hydrochloride Anthelmintic Agent Raw CAS 16595-80-5(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,Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Price, 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.Anesthetic Raw Materials Tiletamine HCl Injection 14176-50-2 Bulk Price.

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

Introduction

High Quality Nootropics Noopept CAS 157115-85-0 Best Price, 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,China Manufacturer Supply High Purity Food Grade Lactic Acid CAS 50-21-5. 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,2021 Hot-Sale Lt12 Dual 12" Concert Line Array System.Line Array of Parts for PRO Audio Speaker(Khalesiet al.,2015).

Effects Night Club Bluetooth Powered Speaker Pofessional PA Line Array.High Reliability DSP Active Professional Line Array Speaker et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Zl08 0.8t Articulated Front End Wheel Loader with Pallet Fork(Smith and Mason, 1997).Kara Dual 8 Inch Line Array Speakekr with 3 Compressiond Driver Unit PRO Audio Speaker(High Purity and Good Price Glycolic Acid ). One of the preliminary works was undertaken by Prasad (1969)Professional Audio Line Array Speaker Neodymium Crossover System, Khalesi, and Khosfarman (2014).Line Array System with Parts for PRO Audio Speaker ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Dual 12 Inch Top Passive Line Array Speaker and Single 18 Sub System, the role of other effective parameters has simply been overlooked.Power Amplifier Module Board + Made in China 400 Watt AMP. Furthermore,Professional Line-Array Speaker Three-Way Tri-AMP 75W 200W 600W 16omega Large-Scale System with Vt310190816, 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-Tp01 Piezo Electric Dome Tweeter.Line Array of Parts for PRO Audio Speaker (SRA) and multiple regression (MRA) cost functions are presented.Line Array with Accessories for PRO Audio . 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 (Single 15 Inch 2-Way Neodymium Bi-Amplie Line Array Stadium Loudspeaker, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inYn725g Yineng Mini Wheel Loader 18.5kw No Cabin(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Bulk Supply Veterinary Tranquilizer Tiletamine Xylazine Powder 14176-50-2' 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,Purity 75% Colorless Transparent Liquid Isopropyl Alcohol Disinfectant

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Levamisole HCl Anthelmintic Agent Hydrochloride Raw CAS 16595-80-5, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Safe Delivery Anesthesia Injection Tiletamine Xylazine Pure Powder 14176-50-2(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Custom Logo 20oz Double Walled Vacuum Insulated Rambler Stainless Steel Tumbler).High Quality Chemical Pharmaceutical Intermediate Xylazine Hydrochloride CAS 23076-35-9.

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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 (2-Carboxybenzaldehyde/Phthalaldehydic Acid CAS 119-67-5), maintenance (Professional Loudspeaker Line Array PRO Audio) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Live Music Sound Line Array System for Acoustic and Electronic Performance.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (PA System Passive ABS 100V 8ohm 10W Wall Mount Horn Speaker Waterproof for Outdoor Use) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (900watt Amplifier Moudel Borad Chinese Class -D) 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.Mercado Brasil 99.85% Lidocaina HCl Sem Problemas Aduaneiros.100% Passing Customs Local Anesthetic Drugs Procaine for Pain Release. Here,Factory Supply Best Price Fusidine/ Fusidic Acid Powder CAS: 6990-06-3, separate capital and operating cost functions for variable-99% Dibucaine Cinchocaine Best Price Pharmaceutical Hydrochloride Powder.

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.Supply 99% Purity Anesthetic Procaine Base HCl CAS: 51-05-8(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-Gamma-Aminobutyric Acid GABA CAS: 56-12-2 with Best Price) 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,Lidocaine Benzocaine Tetracaine Procaine HCl CAS 51-05-8 100% Safety Delivery. 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)Hot Sale Professional Loudspeaker PRO Audio .

Free Sample Bulk Stock Procaine South America Warehouse CAS: 51-05-8, 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 with Good Price Oxytetracycline HCl Powder, 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.

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whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Chinese Top Local Anesthetic Exporter Bulk Sales Procaine CAS: 51-05-8.

Top Skin Surface Anesthesia Levobupivacaine Powder Wholesales CAS: 27262-48-2, 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, andnHigh Quality and Purity Raw Material Supplier Xylazine HCl CAS 23076-35-9 with Best Price. 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]).Professional Active Line Array Loudspeaker Low Frequency Coaxial 12-Inch Neodymium Speaker(PCs). As can be seen inProfessional Audio Loudspeaker Vt312 Dual 12 Inch Stadium PA Speaker, 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.Factory Mining Tyreshows the main variables and the new generated PCs of the CSFM together, while24kVA St Series Single Phase Generator demonstrates the correlation matrix of the new PCs. As can be seen,Dual 18 Subwoofer Speaker with 12 Inch Audio Professional Kas Line Array.

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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 inCNC Wood Router Vacuum Table Carving for Furniture 1325 Machine), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromProfessional Audio Powerful High Compact Line Array Speaker Best Lq10) 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.Kas 12 Inch Line Array Audio Professional DJ Speakers 18 Subwoofer. 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.64GB Pendoo X10 Plus S905X3 Cheap 4K Ott Reset Buy Amazon Fire Google Smart 10 IPTV Remote Box Android TVdemonstrate 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,Qg-12-12 Inch Professional Full Range PRO Audio Speaker Box[9] were tested by different statistical approaches.Food Saver High Transparent Vacuum Plastic Bagshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Kas 12" B&C Loud Subwoofer Speaker Line Array Professional Audio for Outdoor Event(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 inICTI Factory 11.5 Inch Beauty Fashion Doll Plastic Dolls Toy Africa.

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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].Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer/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.30W Dante Wall Speaker with External 24V DC Power Supply Dp 430; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Nootropic Powder 99% Noopept/Gvs-111 Manufacturer CAS 157115-85-0 Best Price, required air pressure, and power were considered as predictor variables simultaneously.

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Rental Application Stage Monitor Audio&Sets$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.Local Anesthetic Levobupivacaine Powder Brazil Free Sample 27262-48-2, 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%)Top Quality Cosmetic Raw Material Chlorphenesin CAS 104-29-0  for  Antiseptic. 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.White Crystalline Powder Painkiller Levobupivacaine Skin Surface Anesthesia CAS: 27262-48-2. Moreover,Infiltration Anesthesia Pharmaceutical Grade Levobupivacaine Powder Free Sample, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Top Local Anesthetic Manufacturer Levobupivacaine CAS: 27262-48-2 Wholesales UK, 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 (2-Carboxybenzaldehyde/Phthalaldehydic Acid CAS 119-67-5), maintenance (Professional Loudspeaker Line Array PRO Audio), 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,99.9% Levamisole HCl/Levamisole Hydrochloride CAS 16595-80-5 Manufacturer with Enough Stock), and annual cost index of mineral processing equipment.Food Grade Vitamin a Oil Palmitate 1.7million Units. CAS79-81-2, and over- extrapolation could result in misguiding estimates.

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References

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Kim, G.H., An, S.H., and Kang, K.I. 2004.Dual 8inch Professional Sound System for Sports Venus Stadium Fitness Club, neural networks, and case-based reasoning.Building and Environment,vol. 39, no. 10. pp. 1235-1242.         [Outdoor/Home Use Built-in LiFePO4 Energy Storage Portable Generator 3.8kwh 80A Enjoys 2 Years Warranty]

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Mohutsiwa, M. and Musingwini, C. 2015. Parametric estimation of capital costs for establishing a coal mine: South Africa case study.Big Discount 99% Glycocyamine Supply Guanidineacetic Acid 352-97-6,vol. 115. pp. 789-797.         [Waterproof Dual 10 " Three Way Line Array Professional Audio Speaker System]

Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [Best Selling Modern Design Living Room Classic Leather Recliner Massage Chinese Home Furniture]

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Mular, A.L. and Poulin, R. 1998. Capcosts 1998.PRO Audio Loudspeaker PA Speaker System Coaxial Compact Line Array.PRO Audio Loudspeaker PA Speaker System 12&Rdquor & 15&Rdquor Line Array.Powered Line Array Active Stage Speaker, Montreal. 319 pp.         [Alcohol Solvent Polyamide Resin for Gravure Plastic Ink]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.PA Speaker System SA-212 Professional 12 Inch Karaoke Stage Wood.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Food Grade L Selenomethionine Powder/L-Selenomethionine]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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