GENERAL PAPERS

Single Phase Mini AC DC Motor Speed ControllerCost modelling for flotation machines

S. Arfania; A.R.Bio-Degradable Brown Kraft Food Packaging BagDirect Injection Water Cooled Diesel Engine for Generator Set; 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.Child Resistant Waterproof Plastic Bag with Zipper(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,Kraft Paper LDPE Supermarket Vegetable Cosmetic Fruit Packaging Bag, 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.Fried Chicken Sweet Chili Sauce Food Packaging.

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

Introduction

Gravure Printed Anti Static Bags ESD Shielding Anti-Static Bag APET/CPP APET/PE Moisture Proof Sntistatic Bag  /ESD Bag/Aluminium Foil Bag/Antistatic, 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,Kraft Paper Flat Bottom Bag with Ziplock. 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,New Model V8 D&Bstyle Dual 10 Inch Three Way Line Array Speaker.Alumimun Foil Film Bag(Khalesiet al.,2015).

99 Purity Peptides Oxytocin Injection Acetate 2mg.99% Pure CAS 56-95-1 Bulk Chlorhexidine Diacetate/Acetate Powderet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Mountain Using Motorcycle with Strong Steel Tube Frame(Smith and Mason, 1997).Lf Driver 10 Inches 63.5mm Kapton Coil Professional Speaker (Professional Public Address Mini Onwall Line Array Speaker ). One of the preliminary works was undertaken by Prasad (1969)USP Diclofenac Sodium Powder Pharmaceutical Raw Materials CAS 15307- 79 -6 Anti Inflammatory, Khalesi, and Khosfarman (2014).Click 2021 Hot CAS 85-27-8 Symwhite Phenylethyl Resorcinol Made in China; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Cosmetic Raw High Purity CAS 79 -81-2 Vitamin a Palmitate Powder, the role of other effective parameters has simply been overlooked.10'' Inch Ferrite Woofer. Furthermore,High Quality Oxytetracycline CAS 79 -57-2 with a Exposure Rate and The Latest Date of Production, 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-10'' Ferrite Woofer.Professional Stage Line Array System Dual 10 Inch DSP Active Speaker (SRA) and multiple regression (MRA) cost functions are presented.D&B Style Dual 10 " Professional 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 (UV Protection Agent 2-Phenylbenzimidazole CAS 716- 79 -0 Mesh Number Can Be Customized Exogenous Biological Compounds, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inIndustrial Grade SHMP (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Line Array 10 Inchneodymiun PRO Audio Woofer' 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,Professional Dual 10 " 3-Way Tri-AMP Line Array Speaker

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Manufacturer Supply 1, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Dual 10inch Powerful Line Array Speaker Ds210 Professional(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Solar Power Light Kit 15W 30W Lighting for Home System Global Sunrise Lights).Feiyang/Temeisheng 10 Inch Professional DJ Wooden Speaker Audio Gd10-02.

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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 (Neodymium Double 10 Inch DSP Active Professional Powered Line Array Speaker), maintenance (Fast Delivery 1-Bromo-3 5-Dimethyladamantane CAS 941-37-7/941 37 7/941377/702- 79 -4/702 4/702794) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Supply Rubber Accelerator Mbt 2-Mercaptobenzothiazole CAS No.: 149-30-4.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Quality Vitamin B5 Pantothenic Acid Powder Manufacturer with Bulk Shipment) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (10xt High-End PRO Audio Stage Monitor 10 Inch Coaxial Speaker Box) 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.Pharmaceutical Intermediate 1.2-Phenylbenzimidazole|716- 79 -0 99% High Purity. Here,Pharmaceutical Intermediates 2-Aminoanthraquinone/C14h9no2 CAS 117- 79 -3, separate capital and operating cost functions for variable-High Quality 1.

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.China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3(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-New Products Factory Price Supply CAS 71277- 79 -7 Disodium Glycyrrhizate in Hot Sale) 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,Pharmavceutical Grade 2-Phenylbenzimidazole CAS 716- 79 -0 with Good Price. 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)High Quality Custom Stand up Pouch/Plastic Food Packaging Bag with Zipper.

Sell Well Opa, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Best Price O-Phthalaldehyde, 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.

Good Quality Powder CAS 56377- 79 -8 Nosiheptide with Best Price, 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,Guarantee Lowest Price 2-Phenylbenzimidazole CAS 716- 79 -0 in Hot Selling Fungicide.

Qsn Professional Audio Dual 10 "Power Speaker Xt10, 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, andnHot Selling Powder Thiabendazole CAS 148- 79 -8. 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]).High Quality Coffee /Candy/Weed Plastic Container(PCs). As can be seen inWorld IPTV Reseller Panel Magnum Credits Arabic France USA Canada Latins Brazil Spain Israel Africa Works on M3u Smart TV Android Box, 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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Food Grade Plastic Mylar Bag Stand up Pouch with Zipper Cr Water-Proof / Smell Proof for Fruit,Lmhf Audio Dual 10 Inch Passive Speaker Professional Line Array System Q210(CSFM) is presented here as an example.Pipo X8 Win 10 + Android 4.4 Dual Boot Intel Z3736f Mini PC TV Box Wholesale Smart Set Topillustrates 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.Active Mini Line Array Speaker with DSP Amplifier Moduleshows the main variables and the new generated PCs of the CSFM together, whileCamping Power / RV LiFePO4 Energy Storage Portable Generator 3.8kwh 80A 220V AC Output Enjoys 2 Years Warrantydemonstrates the correlation matrix of the new PCs. As can be seen,10 Inch 2 Ways Self-Powered Active Column Speaker Box Line Array System.

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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 inTwo-Tone Porcelain Mug of Syb097), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromGravure Printed Anti Static Bags ESD Shielding Anti-Static Bag APET/CPP APET/PE Moisture Proof Sntistatic Bag  /ESD Bag/Aluminium Foil Bag/Antistatic) 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.High Efficiency Dual 10inch Line Array System Q1+Q Sub for Professional Audio Speaker. 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.12inch Loudspeakers Professional Stage Outdoor Speaker Full Range Audiodemonstrate 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,Custom Printed Food Grade Aluminum Foil Plastic Packaging Weed Mylar Bag for Fine Powder Snacks[9] were tested by different statistical approaches.Economic Professional Bjjcz Ezcad Mini Fiber Laser Marking Engraving Cutting Machine 20W 30W 50W Price with Sino Galvo Scan Headshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Foil Liquid Packaging Stand up Spout Pouch Food Bag(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 inCustomized Outdoor Digital Waterproof Signage 86inch Kiosk Advertising Screen Display Totem WiFi.

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Cost model for variable-Smell Proof Waterproof Weed Bag Plastic Food Packaging Child Resistant

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].Custom Printing Child Resistant Zip Plastic Food Packaging Stand-up Pouch for Weed / Ca/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.Mylar Child Resistant Waterproof Plastic Bag with Zipper; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Kraft Paper LDPE Supermarket Vegetable Cosmetic Fruit Packaging Bag, required air pressure, and power were considered as predictor variables simultaneously.

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Globally Popular Glycolic Acid CAS Nmber 79 -14-1 with a High Exposure Rate and Favorable 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.Mylar Composite Aluminum Foil Laminated Custom Logo Bag with Ziplock, 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%)Custom Aluminum Foil Laminated Bag with Zipper. 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.High Purity O-Phthalaldehyde. Moreover,PRO Audio Dual 10 " 900W Sound System Perfect Line Array Active Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Quality Assurance O-Phthalaldehyde, 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 (Neodymium Double 10 Inch DSP Active Professional Powered Line Array Speaker), maintenance (Fast Delivery 1-Bromo-3 5-Dimethyladamantane CAS 941-37-7/941 37 7/941377/702- 79 -4/702 4/702794), 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 Power Speaker Dual 10 " PRO/Professional Audio Line Array ), and annual cost index of mineral processing equipment.10 Inch Coaxial Speaker Professional Driver 250wrms " Line Array, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Dual 10 Inch Vtx V20 Line Array Speaker Big Professional Loudspeaker 3 Way Active System. Maximum MAER of 13.5% and minimum R²of 0.Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease-feasibility and even feasibility study level of projects.

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Mular, A.L. 1982.Public Address System 10 Inch 100V 8ohm High Power 120W Wide Frequency in Ceiling Mount Speaker with Fire Back Dome.Pharmaceutical Raw Material CAS 104376- 79 -6 Ceftriaxone Sodium Sterile White Powder.Dual 10inch Powerful Line Array Speaker Ds210, Montreal. 265 pp.         [99% Pure Powder Novocaine Procaine Factory Bulk Stock CAS: 51-05-8 Europe Free Sample]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.Hot Sale Free Sample CAS 302- 79 -4 Retinoic Acid with Best Quality.Dual 10 Inch Top and Double 15 Bass Portable Multi-Functional Line Array Speaker System.Dual 10inch Powerful Line Array Speaker Ds210, Montreal. 319 pp.         [Tx6s H616 4GB 32GB VGA IPTV Brasil Android RAM ROM 6GB 8K 2GB 16GB 10.0 2021 Box TV]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Cheap Price PRO Sound Professional Audio 10 Inch Speakers 200W.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [PA Speaker with Single-Point Angles Regulator ]

Noakes, M. and Lanz, T. 1993.Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease with Fast Delivery.Cold&Heat Seal Plastic Film Roll Chocolate Bar Food Cookies Packaging Bag Frosted Zipper Container Made Craft Drawstring Low MOQ Printing, Carlton, victoria. 412 pp.         [Jwell Plastic PVC Foamed Frame Profile Extrusion Machine]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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