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Made in China Disposable Overnight Adult Pants Diapers
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
Hot Sale Factory Direct Easy Open Tin Can for Food CanneryCost modelling for flotation machines
S. Arfania; A.R.Chinese Cheap 1000W 2 Wheel Mobility Scooter Electrical Moped Motorcycle for AdultTricycle with Wagon 3 Wheel Motorcycle Box; 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.350-1000W Pedal Assist Electric Scooter Parts 10 Inch Mobility Tricycles Motorcycles Chinese for Adults(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,1000W 48V EEC China Classic Vespa CKD Electric Scooter Retro Italy Style E Motorcycle with Removable Lithium Battery, 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 0.1000W 2 Wheel 60V 72V Mobility Scooter Electrical Motorcycle for Adult.
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Chinese Best Cheap Electric Scooter Korea Hot Sell 48V Thailand Motorcycle with Pedal, 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 Smart Electric Scooter 60V800W Power Motor with USB. 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,Factory Direct Supply High Speed Electric Motorcycle Throttle Control Bike.Cheap Street Electric Scooter Motorcycle with Bit Protect Frame 60V800W(Khalesiet al.,2015).
China Tl08 Mini Wheel Loader with Low Price for Sale.Er08 Farm Mini Loader with Standard Bucket for Saleet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Allsparkpower Intergrated System 3kwh -30kwh off Grid Home Use Solar Power Supply with Inverter(Smith and Mason, 1997).Yn725 Yineng Mini Wheel Loader 18.5kw(Gogo Electric Moped Scooter Opg-Em022 Motor Power 800W 60V20ah Chaowei Tianneng Battery). One of the preliminary works was undertaken by Prasad (1969)Ce Approved Mini Loader with Road Sweeper, Khalesi, and Khosfarman (2014).2386 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Easy Installation Good Quality Factory Supply Grid Tied 10kw 12kw 15kw on Solar System for Commercial and Industrial Use, the role of other effective parameters has simply been overlooked.Mars Solar 5kw on Grid Home Power System 5000W 5kVA 5000 Watts Energy Systems 10kw Tied. Furthermore,60V/72V 1200W Electric Scooter with Tianneng Battery, 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-Best Price Solar Energy Systems Home Panel System 15kw 20kw on Grid.Customization Energy Solution 1kw 2kw 3kw 5kw 10kw 15kw 20kw 25kw 50kw on Grid/Grid Tied Solar Panel Power System(SRA) and multiple regression (MRA) cost functions are presented.Metal Cans 0.925 Liter Tin Barrel for Packaging Container. 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 (Frequency Inverter Pump AC Drive Price, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHigh Impact Strength and Low Water Absorption Resin 610(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Frequency Inverter VFD AC Drive' 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,0.5L Tin Can with Dry Cover
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Food Grade Container 1 Liter Square Olive Oil Latest Design Metal Tin Cans, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),AC Frequency Converter 50Hz 60Hz Drive Inverter(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (3 Layers 6 Pans Stainless Steel Electric Deck Oven).Good Quality Electric Bike & Two-Wheel Dual Motor Foldable China Motorcycle for Adult.
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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 (Food Grade 3 Liter Square Olive Oil Tin Can with Handle and Cap), maintenance (Cheap Power Motor Big Protect Frame Electric Scooter Motorcycle 60V800W) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,850 Alicosolar 5kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (Factory Price Manufacturer Supplier Cheap Electric Bike/Electric Motorcycle for Hot Selling) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Cheap Smart Lady's Electric Scooter 60V800W) 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 Selling Electric City Bike New Scooter E-Scooter Motorcycle as Children's Gifts.Lady Scooter Motorcycle 2.5 16 Tire Custom Bike. Here,0.8 Ton Mini/Small Tractor Front End Wheel Loader with Hydraulic Forklift, separate capital and operating cost functions for variable-Yn725 Yineng Mini Wheel Loader 18.5kw.
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.Wheel Loader Mini Wolf Wl80 with Forks(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-Zl08 0.8 Ton Agricultural Farm Articulated Mini Wheel Loader with Hydraulic System) 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,Wolf Wl80 Mini Radlader Hoflader with Forks in Farm. 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 Color Fastness Grey Oak Gris Platinum Engineered Veneer Chapa Precompuestas Fineline with Ayous Base.
L55 Best Android High Quality Firmware Update Google Certifed Set Top Japanese Free Streaming Japan Smart TV Box, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Cheap Electric Scooter 500W Pedal Bicycle 25km/H for Export, 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.
Big 4000W 70V Electric Scooter, 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,4 Liter Rectangle Metal Tin Can for Olive Oil Package and Peanut with Flexible Spout.
18L Square Metal Tin Cans with Handle and Lid for Oil, 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, andnGlue Tin Can with Plastic Lid / Square Metal Paint Sizes. 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]).Home or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Service(PCs). As can be seen inFiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood, 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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Good Quality Empty 1 Litre Metal Tin Paint Cans with Handle for Sale,Pinergy Grid Tied Solar Panel System 6kw Energy 110V Single Phase(CSFM) is presented here as an example.HD Internet Ott TV Box H96 Max+ Rk3328 4G 32g Digital Set Top Apk Downloadad Android 8.1illustrates 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.Uns 2205 S32750 Hot/Cold Rolled Bright Polished Corrosion Roofing Constructions Industry Decorate Stock Ba 2b Hl 8K Stainless Steel Ss Sheets/Plates/Coilsshows the main variables and the new generated PCs of the CSFM together, whileDouble 12inch Active Coaxial 29kg Line Array Speaker Systemdemonstrates the correlation matrix of the new PCs. As can be seen,off Grid 5kw 10kw Solar Power 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)
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 in5years Warranty Light Control Solar Integrated Garden), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromProfessional Line Array Speaker Single 10 Inch Full Range System) 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 0.2013 Popular Electric Motorcycle 90km with Pedal CE . 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.Chinese Best Cheap Electric Scooter Korea Hot Sell 48V Thailand Motorcycle with Pedaldemonstrate 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,Chinese Zl08f Wheel Loader 0.8ton Mini with Quick Hitch for Sale[9] were tested by different statistical approaches.ISO9001 Certificate Factory Supply Nylon 6pr New Motorcycle Tyre Tubesshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Wolf Loader Wl80 Radlader Without Cabin(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 inT Die Head for Wire Drawing Machine PP/PE Plastic Modular.
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Cost model for variable-Yn725g Approved Hot Sale Mini Wheel Loader Yn725
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].Er08 New CE Approved Small Shovel Loader/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.Everun Brand New Generation CE Approved Er408 0.8ton Mini Front End Wheel Loader; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,1000W 48V EEC China Classic Vespa CKD Electric Scooter Retro Italy Style E Motorcycle with Removable Lithium Battery, required air pressure, and power were considered as predictor variables simultaneously.
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Low Frequency Inverter AC Drive$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.Frequency Inverter Converter 50Hz 60Hz, 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%)Single Phase Mini AC DC Motor Speed Controller. 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.Frequency Inverter Pump AC Drive Price. Moreover,Jarol Frequency Inverter JAC200 3 Phase 380V 4kw, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Inverter, 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 (Food Grade 3 Liter Square Olive Oil Tin Can with Handle and Cap), maintenance (Cheap Power Motor Big Protect Frame Electric Scooter Motorcycle 60V800W), 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,AC Drive Inverter Low Frequency Power), and annual cost index of mineral processing equipment.0.75kw Output Single Phase AC Converter Frequency Inverter VFD Pump, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,AC Drive Variable Drive. Maximum MAER of 13.5% and minimum R2of 0.China AC Drive Manufacturers-feasibility and even feasibility study level of projects.
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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