GENERAL PAPERS

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S. Arfania; A.R.Food Packaging Vacuum PouchFast Delivery High Purity Benzaldehyde 100-52-7; 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.Good Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Delivery(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,L-Arginine 99%, 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 Factory Price CAS 702- 79 -4 1.

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

Introduction

CPP High Temperature Vacuum Retort Pouch, 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,Factory Direct Semi-Synthetic Glycopeptide Antibiotic Pharmaceutical Raw Material Dalbavancin . 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,High Temperature 3 Side Seal Retort Pouch for Corn.R-3-Amino-1-N-Boc-Piperidine(Khalesiet al.,2015).

ISO Certified 100% Natural L-Arginine Powder.Mylar Barrier Exit Waterproof Cr Baget al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Quality Cosmetic Grade Hydroxyacetic Acid Glycolic CAS 79 -14-1(Smith and Mason, 1997).Stand-up Ziplock Dried Food Packaging Vacuum Plastic Container(AC Drive Inverter Low Frequency Power). One of the preliminary works was undertaken by Prasad (1969)High Quality Laminated Food Grade Roll Film, Khalesi, and Khosfarman (2014).D&B Style Dual 10 Inch Compact Line Array ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Safety Shape Bag /Food Packaging Contact Plastic Container for Resealable, the role of other effective parameters has simply been overlooked.Custom Plastic Coffee Flat Bottom Food Packaging with Ziplock Container. Furthermore,Family Usage Embossed Vacuum Bags for Food, 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-Matte Black Food Packaging Stand-up Pouch Aluminum Foil Bag.Snsck Food Bag Fried Flat Bottom Box Pouch with Zipper(SRA) and multiple regression (MRA) cost functions are presented.Dual 10 " Compact Speaker Line Array . 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 (10 " Woofer with 3" Voice Coil, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inKas PRO Top 10inch Line Array Audio Speaker(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Lf Drivers 10 Inches 50-4000 Response Martin Audio Speaker Pw1026-64' 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,10'' Inch Ferrite Woofer

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Q1 Dual 10 " Line Array System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (50kVA/40kw Power Generator Set Diesel Engine Genset).D&B Style Dual 10 " Compact Line Array .

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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 (New Tw Audio Vera36 Dual 10 " Line Array Speaker System), maintenance (Professional Line Array Vtx V20 Dual 10 Inch Three Way Speaker) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dual 10 " Compact Professional Line Array .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Custom Kraft Paper Flexible Food Packaging Flat Bottom Bag-100gr) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Custom Water Proof Child Resistant Food Grade Plastic Aluminum Laminated Stand up Container Bag) 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.Hot Sale Vacuum Bag Nylon Material for Agricultural Products.Buy 99% Retinoic Acid Powder Vitamin a Tretinoin Retinol for Cosmetic. Here,Bio-Degradable Brown Kraft Food Packaging Bag, separate capital and operating cost functions for variable-Child Resistant Waterproof Plastic Bag with Zipper.

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.Kraft Paper LDPE Supermarket Vegetable Cosmetic Fruit Packaging Bag(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-Fried Chicken Sweet Chili Sauce Food Packaging) 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).

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whereYrefers to capital or operating costs,Xdefines an independent variable (one of the machine predictor variables), andaandbare constant values (parameters)Kraft Paper Flat Bottom Bag with Ziplock.

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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.

99 Purity Peptides Oxytocin Injection Acetate 2mg, 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,99% Pure CAS 56-95-1 Bulk Chlorhexidine Diacetate/Acetate Powder.

Lf Driver 10 Inches 63.5mm Kapton Coil Professional 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, andnUSP Diclofenac Sodium Powder Pharmaceutical Raw Materials CAS 15307- 79 -6 Anti Inflammatory. 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]).Click 2021 Hot CAS 85-27-8 Symwhite Phenylethyl Resorcinol Made in China(PCs). As can be seen inOTR G2 Grader Tubeless Tyre 17.5-25, 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 Wholesale Direct Sale Bicycle Folding Mountain Bike 26 Inch Variable Speed Double Shock Absorbershows the main variables and the new generated PCs of the CSFM together, whileHo-500 Ce Approved High Quality Eye Diagnosis System Ophthalmic Ultrasound Scannerdemonstrates the correlation matrix of the new PCs. As can be seen,10'' Ferrite Woofer.

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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 inBath Factory Export Arab Drop in Soaker Tub), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromHot Selling 2ND Generation Ultrasound Bone Densitometer) 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.D&B Style Dual 10 " Professional Speaker 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.Heavy Loader 5wheel Cargo Tricycle with Cabindemonstrate results for the machines modelled in this research.

Multiple regression results

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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].Mylar Custom Printing Barrier Exit Bag/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

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Manufacturer Supply 1$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.Dual 10inch Powerful Line Array Speaker Ds210 Professional, 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%)Feiyang/Temeisheng 10 Inch Professional DJ Wooden Speaker Audio Gd10-02. 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.Neodymium Double 10 Inch DSP Active Professional Powered Line Array Speaker. Moreover,Fast Delivery 1-Bromo-3 5-Dimethyladamantane CAS 941-37-7/941 37 7/941377/702- 79 -4/702 4/702794, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Supply Rubber Accelerator Mbt 2-Mercaptobenzothiazole CAS No.: 149-30-4, 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 (New Tw Audio Vera36 Dual 10 " Line Array Speaker System), maintenance (Professional Line Array Vtx V20 Dual 10 Inch Three Way 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,High Quality Vitamin B5 Pantothenic Acid Powder Manufacturer with Bulk Shipment), and annual cost index of mineral processing equipment.10xt High-End PRO Audio Stage Monitor 10 Inch Coaxial Speaker Box, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Pharmaceutical Intermediate 1. Maximum MAER of 13.5% and minimum R²of 0.2-Phenylbenzimidazole|716- 79 -0 99% High Purity-feasibility and even feasibility study level of projects.

References

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Mular, A.L. 1982.Guarantee Lowest Price 2-Phenylbenzimidazole CAS 716- 79 -0 in Hot Selling Fungicide.Qsn Professional Audio Dual 10 "Power Speaker Xt10.Hot Selling Powder Thiabendazole CAS 148- 79 -8, Montreal. 265 pp.         [Radlader Zl08 Wheel Loader for Sale Mini Articulated]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.High Quality Coffee /Candy/Weed Plastic Container.Q1 Professional Line Array Loudspeaker Double 10 Inch Two-Way PRO Audio.Hot Selling Powder Thiabendazole CAS 148- 79 -8, Montreal. 319 pp.         [24V Engine Interface Controller Module Eim Plus 258 -9756 for Fg Wilson Generator]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Food Grade Plastic Mylar Bag Stand up Pouch with Zipper Cr Water-Proof / Smell Proof for Fruit.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Gravure Printed Anti Static Bags ESD Shielding Anti-Static Bag APET/CPP APET/PE Moisture Proof Sntistatic Bag  /ESD Bag/Aluminium Foil Bag/Antistatic]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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