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LED Lens Strip Used for LCD TV Repairing
On-line version ISSN2411-9717
Print version ISSN2225-6253
J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017
http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â
GENERAL PAPERS
Electric Scooter/ Motorcycle/TM-MonyaCost modelling for flotation machines
S. Arfania; A.R.Factory Supply 2-Phenylbenzimidazole CAS 716- 79 -0 with Best PriceDisodium Phosphate Anhydrous; 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.Pharmaceutical Grade Raw Powder 99% Purity Medrogestone 977- 79 -7(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,Supply High Quality L-Lactic Acid with CAS 79 -33-4, 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.Lanosterol 79 -63-0 .
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Seaweed Iodine Factory Price Wholesale 99% with Chemical CAS/ 68333- 79 -9, 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,99% Purity Local Cinchocaine Powder Dibucaine CAS 85- 79 -0 Price. 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 Purity Retinol Palmitate Powder.Hot Sale Dual 10 " Speaker PRO Audio (Khalesiet al.,2015).
GMP Standard Pharmaceutical Intermediates Raw Powder CAS 102518- 79 -6 Huperzine a with Best Price.Qige Factory Kinetin CAS 525- 79 -1 Plant Growth Hormone 6-Furfurylaminopurine 99%et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Nitrogen Fertilizer(Smith and Mason, 1997).China Factory Price Chlorhexidine Diacetate CAS 206986- 79 -0(Pharmaceutical Chemical 1-Hydroxypyrene CAS 5315- 79 -7). One of the preliminary works was undertaken by Prasad (1969)Plastic Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Resealable Beef Nuts Rice Coffee Cereal Tea Pouch, Khalesi, and Khosfarman (2014).Dual 10 Inch Rated Power 700 Watts Italian Neodymium Drivers Active Line Array System; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Purity and Good Price Glycolic Acid , the role of other effective parameters has simply been overlooked.Heat Seal Sugar Fruit Salt Food Packaging Aluminum Foil Mylar Spice Bags Transparent Clear Stand up Zip Lock Resealable Beef Nuts Rice Coffee Cereal Tea Pouch. Furthermore,OEM Metallized Stand up Zipper Toys Plastic Rice Meat Container Custom Printed Zip Lock Pouch Food Packaging Mylar Exit Gift Bag, 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 Inch Powered PA Speaker Full Range Stereo System.Wholesale Matelized Bottom Gusset Stand up Barrier Exit Zipper Food Packaging Mylar Bag Custom Printing Colorful Aluminum Foil Laminated Plastic Container(SRA) and multiple regression (MRA) cost functions are presented.Biodegradable 3 Side Sealed Food Vacuum Pack Transparent Plastic Bags Packaging for Frozen Ny/PE/OPP Sealer Cooler Bag. 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 (3X3 video wall LCD HD 1080P digital display screen, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFactory Wholesale Price Industrial Induction Vacuum Furnace(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Food Saver High Transparent Vacuum Plastic Bag' 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,Waterproof Outdoor Dual 10 " Line Array
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Aluminum Foil Self Sealing Digital Plastic Packaging Bag Glossy Holographic Stand up Clear Front Laser Film Food with Zipper, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Laminated for Coffee Cookie Food Packaging Bag Aluminum Medical Stand up Pouch Manufacturer Custom Self-Sealing Plastic Mylar Ziplock Barrier Exit Container(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Hot Selling Plain Slim Fit Hoodies No Pocket Blank Sweatshirts with Labels Private Label Mens).PRO Audio Powered Line Array Tw- 10 Outdoor Speaker.
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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 (Customized Label Plastic White Black Kraft Paper Pouch One Way Valve Roasted Bean Flat Bottom Coffee Bag Food Packaging Rice Pet Container), maintenance (Manufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Mylar Recyclable Heat Sealed Coffee Bean Rice Dough Powder) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,V8/Vsub Dual 10 " Compact Indoor/Outdoor Stage Line Array Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Morin Professional Audio 10inch Line Array Speaker Tw- 10 & Tw-18 Sub) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Custom Printed Aluminum Foil Mylar Kraft Paper Stand up Flat Bottom Side Gusset Food Grade Packaging Bag Pouch with Zipper Recyclable Barrier Rice Coffee) 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.Manufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Coffee Bean Three-Side Sealed Mylar Chocolate.Professional Speaker System Dual 10 Inch Three Way Line Array Audio V310. Here,Passive RMS 700 Watts Dual 10 Inch Neodymium Line Array Speaker for Outdoor Show, separate capital and operating cost functions for variable-Outdoor Speaker Dual 10 Inch Line Array.
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.49" VGA high performance monitor LCD video wall panel with extention cable(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-LG LD490DUN-TJB2 LCD wall mount video with 2X2 panel) 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,High Quality Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price Acid Glycolic. 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)1.8mm ultra narrow bezel 16: 9 LED TV video wall for home.
wall mount 16: 9 LCD screen video for big project, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (aluminium video wall LCD HD 1080P flat panel display, Khalesi, and Khosfarman, 2014).
whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables 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.
LG LD550DUN-TKB1 video wall system with matrix switcher, 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]:
whereXobsis the observed value,xethe estimated value at time/placeI,and n,Transparent Flat Bottom Box Pouch Stand up Zip Lock Bag Eight Sides Seal Side Gusset Standing Plastic Coffee Bean Three-Side Sealed Packaging.
Transparent Flat Bottom Box Pouch Stand up Zip Lock Eight Sides Seal Bag Side Gusset Standing Plastic Clear Coffee Bags Manufacturer Reusable PE Pet Food, 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).
whereCeis the estimated cost,Cathe actual cost, andnLaser Aluminum Resealable Value Pack Stand up Zip Lock Bag Hologram Self Seal Zipper Plastic Sealing Digital Food Packaging Mylar Paper Glossy. 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]).L10/83254 Parlante Professional Sonido Neodymium Woofer Speaker 10 " 250W(PCs). As can be seen inAgricultural Machine Small Wheel Loader Mini780 with CE Certificate, 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 andXias Equations [5] and [6]:
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In this research, main variables ofX1, X2... Xnwere 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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10 Inch KTV System Woofer,Cheap Recycled Brown Kraft Paper Bag with Window 7&Slider Different Capacities Ziplock Manufacturer Heat Sealable Food Storage Doypack Packaging Container(CSFM) is presented here as an example.High Quality 99% L-Pyroglutamic Acid illustrates 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.3kwh LiFePO4 Battery with 5 Years Warrantyshows the main variables and the new generated PCs of the CSFM together, while12kw Grid Tied Solar Systemdemonstrates the correlation matrix of the new PCs. As can be seen,Laminated Food Packaging Bag Aluminum Coffee Stand up Pouch Manufacturer Custom-Made Self-Sealing Plastic Mylar Zipper Exit Barrier Bean Container.
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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)
whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated in14.4W DC12V 1200mA 60LEDs/Meter 5m/Roll LED Soft Strip/Light Bar for Advertising Signs Stage Decorations Entertainment Places with Ce&Rosh CB Certificate), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from150cc 200cc Gas ATV Quad for Adults) 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.
aluminium video wall LCD HD 1080P flat panel display
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 0.10 Inch Indoor Outdoor Professional Loudspeaker. 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.Solar Combiner Box DC 550V System with Mc4 Connectordemonstrate 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,99% Assay High Purity Miriplatin Pharmaceutical Chemical Powder with 141977- 79 -9[9] were tested by different statistical approaches.Outdoor Double 6" Full Range Speakers 12" Active Subwoofer Professional Audiomini Live Bands System for Musician PAshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Double 10inch Line Array Speaker Q1+Q Sub with Neodymium Magnet(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 in1000ml Transparent Dairy Milk Bottle with Custom Logo Printing.
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Cost model for variable-50 Ml - 2100 Fully Transparent Plastic Spout Drinking Water Juice Pouch Bag High Quality Matte Surface Aluminum Foil Stand up Body Scrub
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].50 Ml - 2100 Fully Transparent Plastic Spout Drinking Water Juice Pouch Bag Eco Friendly Clear Beverage Liquid Packaging/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.Hot Selling Best Price 15307- 79 -6 Diclofenac Sodium Powder; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Supply High Quality L-Lactic Acid with CAS 79 -33-4, required air pressure, and power were considered as predictor variables simultaneously.
RC Factory Supply Chemcial Disodium Glycyrrhetate Powder with CAS 71277- 79 -7 as Food Additives. Moreover, the operating cost was detailed in different cost items.Thiosemicarbazide CAS 79 -19-6, indicated inFactory Product 4K Android TV Box Mxq PRO Rk3229 7.1 1GB 8GB, and major extrapolation should be avoided.
O-Phthalaldehyde CAS 643- 79 -8$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.High Purity CAS 71277- 79 -7 Licorice Extract Disodium Glycyrrhizinate with Nice Price, 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%)PRO Audio 2-Way Dual 10inch Line Array System Q1+Q Sub. 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.Pharmaceutical Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory Painkillers. Moreover,1-Bromo-3, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Low Price 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 (Customized Label Plastic White Black Kraft Paper Pouch One Way Valve Roasted Bean Flat Bottom Coffee Bag Food Packaging Rice Pet Container), maintenance (Manufacturer Reusable Ziplock PE Pet Food Stand up Packaging Pouch Bag Flat Bottom Mylar Recyclable Heat Sealed Coffee Bean Rice Dough Powder), 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 Purity CAS 64318- 79 -2 Gemeprost), and annual cost index of mineral processing equipment.Ziplock Dog Food Bag with Bottom Gusset, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,High Quality Glycolic Acid/ Hydroxyacetic Acid CAS 79 -14-1. Maximum MAER of 13.5% and minimum R2of 0.Custom Printed Food Grade Ziplock Packing Bag-feasibility and even feasibility study level of projects.
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Lashgari, A.China Manufacture Poly Zipper Food Packaging Plastic Pouch Bags for Soup Eco Friendly Corn Starch Ziplock Stand Up100% Compostable Biodegradable Clear, A.R. 2013.10 Active Full Range Stage Sound Loud Speaker System Audio,Two Way 10 " Mini Portable PRO Audio Active Loudspeaker PS10,vol. 23. pp. 441-446. [South Africa/ Spain /Sri Lanka /St. Lucia Vincent /Sudan /Suriname /Swaziland /Sweden /Switzerland Shipping Service by Airfreight / Air Cargo From China]
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aluminium video wall LCD HD 1080P flat panel display, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Pet/PE/CPP Ziplock Plastic Clear Nut Package Dry Food Grade Bags.Tunnelling and Underground Space Technology,vol. 27. pp.133-141. [Double 10'' Compact Line Array]
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Smith, A.E. and Mason, A.K. 1997. Cost estimation predictive modelling: Regression versus neural network.The Engineering Economist,vol. 42, no. 2. pp. 137-161. [High Quality Gentisic Acid CAS No.: 490- 79 -9 with Fast Delivery]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
High-Purity Chemical Raw Materials 2-Phenylbenzimidazole Powdered Pharmaceutical IntermediatesCarb Approved Birch PlywoodCorresponding author