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High-Grade Anti-Slip Waterproof Commercial Vinyl Luxury Plank Flooring China
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
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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.Tricycle with Wagon 3 Wheel Motorcycle Box(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,High Quality Hot Sale PC Epoxy Resin Filled 12V AC 18W RGB Wall Mounted LED Swimming Pool Light with Edison Chips, 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.Manufacturer Promotional Square Metal Tin Can for Tea Coffee Packing.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Motor Auto Hydraulic Open Three Wheel Motorcycle for Sale, 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,Hot PC Resin Filled 18W AC RGB Wall Mounted LED Underwater Light with Two Years Warranty. 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,20watt Mopa Laser Marking Machine for Anodized Aluminum Black.Hot Model 18W IP68 Cool White PC Resin Filled Wall Mounted Pool Lighting with Edison Chips(Khalesiet al.,2015).
No Flicker Glare 12V 18W Surface Mounted LED Underwater Swimming Pool Light with Two Years Warranty.2021 New E Bike Best Mini Electric for Adultset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Natural Okoume Venner 0.90mmx6X9FT(Smith and Mason, 1997).Power Saver Device (Cone Top 1 Liter Glue Usage Tin Can). One of the preliminary works was undertaken by Prasad (1969)1liter Empty Paint Tin Can with Lids Factory, Khalesi, and Khosfarman (2014).No Flicker Glare 12V 18W Surface Mounted LED Underwater Swimming Pool Light with CE RoHS IP68 Reports; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,60V800W Electric Scooter with Highlight Rear Box, the role of other effective parameters has simply been overlooked.Empty Canister White Metal Round Packaging Cans Box Tea Tins. Furthermore,2021 Best Selling Dual Battery Pedal Assisted Electric Scooter Bicycle, 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-No Flicker Glare 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with Edison Chip.Hot Selling X96 Mini Amlogic S905W 1GB 8GB TV Box Android 7.0 4K Full HD Quad Core Smart for Internet(SRA) and multiple regression (MRA) cost functions are presented.Vintage Chinese Factory Customizable Classical Retro Style Cruiser Ebike Moped. 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 (Gogo Electric Moped Scooter Opg-Em022 Motor Power 800W 60V20ah Chaowei Tianneng Battery, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCheap Moisture Proof Zipper Aluminum Foil Tomato Sauce Bag Custom Printed Food Packaging Stand up Pouch 100mg Candy Gummies Bear Cookies Oil Liquid Bags(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;20'' 36V 500W Folding Electric Bike 35km/H with 12ah Lithium Battery' 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,Color Marking 20W Fiber Laser Machine Price for Metal
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Covered Tricycle Passenger Enclosed Cabin 3 Wheel Motorcycle, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Engine 150cc China 3 Wheel Motor Tricycle Chinese Commercial(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Surface Mounted Straight Linear Light Bright LED T5 Tube 18W 1.5m 4000K Nature White 90lm/W).High Quality Cheap Classic Light Mini Reverse Three Wheel Motorcycle .
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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 (Mountain Using Motorcycle with Strong Steel Tube Frame), maintenance (10W 20W 30W portable Fiber Laser Marking Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,CATV 860MHz One Way Amplifier.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (CATV Optical Receiver Module Bgo887bo Excellent Flatness 40 to 860 MHz) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (CATV Amplifier Module Bgy887 24V 22.6db Excellent Return Loss Properties) 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.High Efficiency SIM Card Fiber Laser Marking Machine.2021 New Machine Grade CO2 Laser Marking with a Discount. Here,20W Fiber Laser Color Marking Machine for Colorful on Stainless Steel, separate capital and operating cost functions for variable-Mopa Fiber Laser Marking Machine for Black Printing.
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.20W Table Fiber Laser Marking Machine for Metal Stainless Steel(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-Portable Handheld Metal Plastic DOT Peen Marking Machine) 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,5150-5850MHz Sector Panel Antenna with Gain 13dBi. 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)Dirt Bike for Sport Using with Large Power Engine.
Electricity Saver Device , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (3 Phase 50 - 60Hz Intelligent Power Saver, 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.
High Efficient Industrial Electric Motor Power Saver, 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,EEC 125/300cc Euro 5V Max Scooter-Alex One.
Electricity Power Reducer , 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, andnNylon OTR Bias Tyre/Tire Manufacture E3/L3 15.5-25 17.5-25 20.5-25. 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]).Electrical Saver Box (PCs). As can be seen inKara Double 8 Inch Liner Speaker System Professional Audio Equipment, 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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15.5-25 17.5-25 20.5-25 23.5-25 OTR Tire,Growatt 2kw on Grid Inverter 2000W Tied for Solar Power System Home(CSFM) is presented here as an example.IP68 35W 12V PAR56 LED Underwater Lamp Swimming Pool Lightillustrates 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.GMP Factory Supply Procaine Powder CAS: 51-05-8 Novocaine Free Shippingshows the main variables and the new generated PCs of the CSFM together, whileToughness High Engineering Plastics 610 for Auto Partsdemonstrates the correlation matrix of the new PCs. As can be seen,Motorbike for 320cc with Police Cruiser Using Dry Weight 180kg.
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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 inTop CE Quality Rice Mill Machine Manufacturer for Series Milling Plant), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromProfessional Loudspeaker 18 Inch Active Subwoofer DSP Function with Wa118SA) 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.Three Wheel Motor Tricycle Rickshaw Rear Axle. 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.IP68 8W-35W Surface Mounted Green Color LED Underwater Swimming Lightdemonstrate 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,Gas Powered Adult Tricycle Motor Farm[9] were tested by different statistical approaches.2021 Fashionable High Quality with Lithium Battery Electric Scooters EEC Vespa Citycoco Newest Model Motorcycleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Motorcar for Both Civilc and Police Using with 320cc Displacement(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 inZh-780b Automatic Paper Box Machine Price.
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Cost model for variable-Police Using of Motorcycle for Cruiser with Displacement 320cc
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].High Quality Cylindrical Li-ion 12V 40ah 80ah Rechargeable Lithium Battery Pack for Portable Device/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.7kwh Multi-Function Solar Energy Lithium Battery Ion for Home; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality Hot Sale PC Epoxy Resin Filled 12V AC 18W RGB Wall Mounted LED Swimming Pool Light with Edison Chips, required air pressure, and power were considered as predictor variables simultaneously.
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5.8g Omni Antenna/Dual Frequency Antenna 2.4G 5.8g/2400-2500MHz Omi$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 0.45cm Offset Satellite Dish TV Antennas, 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%)150ah Lithium Iron Phosphate . 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.2.4-2.5GHz/5-5.8GHz Dual Frequency WiFi Antenna Internet for Things. Moreover,E3/L3 17.5-25 20.5-25 1800-25 Durable Tyres for Scrapers, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (C Band Satellite TV Antenna 150cm, 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 (Mountain Using Motorcycle with Strong Steel Tube Frame), maintenance (10W 20W 30W portable Fiber Laser Marking Machine), 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,Eougem Original Cheap Radlader 0.8ton with Standard Bucket Made in China), and annual cost index of mineral processing equipment.Dsola ODM/OEM Design High Efficient Mc4 Connector 3 in 1, and over- extrapolation could result in misguiding estimates.
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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