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Outdoor Easy Pop up Folding Advertising Display Tent with Water Proof Fabric
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
No Flicker Glare Pool LED Light Wnderwater Waterproof RGB Wall Mounted Swimming Lamp with Two Years WarrantyCost modelling for flotation machines
S. Arfania; A.R.WiFi RGB+WY Bluetooth Speaker LED Ceiling Lamp LightAluminum Foil Plastic Standing-up Food Packaging Three Side Sealing Container Candy &Chip Mylar Bag; 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.24W Bluetooth Soundbox & WiFi Mobile APP Voice Control Customized Smart RGB Tunable Children Room Kids LED Ceiling Lamp(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,Most Popular Cheapest Price Guitar Capo for Acoustic Guitar, 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.Guitar / Bass Tuner .
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
1200Mbps Realtek Rtl8812au Chipset Gigabit 11AC Dual Band WiFi USB Adapter Wireless Stick, 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,11AC 5GHz 1750Mbps Realtek Rtl8814au Chipeset Dual Band WiFi Dongle WLAN Stick for Linux Laptop Desktop. 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,WLAN/WiFi 2X2 Mimo Airx Engine.Gospell DVB-C SD TV Box MPEG-2/MPEG-4/H. 264 Video Decoding(Khalesiet al.,2015).
Rg-Ap3220 Dual Band and Radio 5.8g Wireless Poe Access Point / Ap.Ruijie Rg-Ap220-E et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Barrier Vacuum Bag& Packaging Films for Food Pakcing(Smith and Mason, 1997).2.4G 5.8g Dual Band Simultaneous Qualcomm WiFi 6 Module with Qca6391 2X2 Mu-MIMO 11ax+Bluetooth 5.1(10'' Ferrite Woofer). One of the preliminary works was undertaken by Prasad (1969)5.8GHz Outdoor Wireless Ap Bridge for CCTV Remote Video Monitoring Solution, Khalesi, and Khosfarman (2014).Android Smart TV Set Top Box 7.1 Quad Core; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,5.8g Rtl8821cu WiFi Bluetooth Video Audio Transmitter Module for Mini Projector, the role of other effective parameters has simply been overlooked.Full Channels High-Tech Zgemma H. S Satellite TV Receiver High CPU Linux OS DVB-S One Tuner. Furthermore,New X96 Mini Android Set Top Box 4K S905W 1GB, 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-4G Lte Cat7 Outdoor CPE 5GHz B46 5150-5925MHz.Nordic Sofa Living Room Three-Person Simple Modern Technology Cloth Latex Art Small Unit Combination(SRA) and multiple regression (MRA) cost functions are presented.Stylish Yellow Two-Seater Children's Sofa. 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 (Living Room Furniture Specific Use Fabric Leisure Sofa, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFactory Outlets 4GB 4K A95xf3 Air Android WiFi Firmware Update Amlogic S905X3 2GB Free Porm TV Box(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Modern Living Room Furniture Fabric Sofa 6127' 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,Modern Green Velvet Lounge New Style Chester Sofa
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Set Top Box Android 9.0 X96 Mini TV S905W, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),2021 Android TV Box H96 WiFi Set Internet(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Muscle Fit Seamless T Shirt with Wholesale Price).Android 6.0 Smart TV Box Rk3229 Quad-Core 2GB/8GB Internet Set Top.
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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 (Media Player Android 6.0 2g+16g Internet Smart TV Box), maintenance (2.4GHz Outdoor Wireless Bridge 300Mbps Tdma High Power 500MW) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,4800-6500MHz 29dBi MIMO Dish Antenna 28dBi Parabolic.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (5GHz High Power Outdoor Wireless CPE Ap by Factory Isigal) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Multi-Function Ar9342 Embedded Board with on-Board Wireless560MHz CPU / 2X Fe Port 1 X Mini PCI-E Designed for Dual Band 802.11n) 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.5.180- 5.825 GHz Qualcomm Atheros Qca9994 Wle1216V5-20 I-Temp 5.8GHz 44 Mu-MIMO 802.11AC Wave 2 80+80MHz Mini WiFi Module Card.Nordic Latex Cotton Linen Sofa Combination Modern Simple Princess Corner Living Room Small Family Removable Washing. Here,Special Wi-Fi 2.4G/5GWIFI+BLE5.0 WiFi Module IOT HF-LPF100, separate capital and operating cost functions for variable-LAN/Wan LED Wsb419 Qualcomm Atheros Ipq4019 Dual Band 802.11AC Mu-MIMO AMD Embedded Motherboard Onboard WiFi System on Module.
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.Modern Home Living Room Furniture Velvet Sofa Set(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 Lift Recliner Chair Sofa ) 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 Back Executive Boss Single Office Sofa Swivel Reception Chair. 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)Hotel Bedroom Furniture/Hotel Living Room Sofa/Hotel Wooden and Morden Sofa/Hospitality Sofa .
Sectional Stanford Sofa, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Top Quality Comfortable Furniture Sets Living Room Sofa, 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.
1200Mbps Wireless WiFi Extender Repeater/Router Dual Band 2.4 & 5GHz Wps Signal Strong Penetrability, 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,Durable VDSL Modem Router with 2.4G/5.0g Dual WiFi Vdb1421-W2 1ge Wan+4ge+2FXS.
Velvet Office Sofa Chair Modern 0303, 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, andnWireless Module Qualcomm Atheros Qca9880 Wle900vx 802.11AC Wave 1 Minipcie WiFi Network Card. 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]).Antique Design Rustic Style Furniture Wax Brown Oak Leg Cream White Linen Fabric Cushions Four Seats Sofa(PCs). As can be seen inCompressor Low Cost Small Type Pressure Transducer, 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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Wf7021A 2.4G 600Mbps 5g 1.2gbps Dual Band 4 Antennas WiFi 6 Router,X96 Air Amlogic S905X3 64-Bit Android 9.0 Ultra 4K 2g 16g Smart TV Box(CSFM) is presented here as an example.PVC Synthetic Leather for Sofa Furniture01illustrates 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.Zl08f Mini/Small Farm Garden Compact Tractor Wheel Loader with Best Priceshows the main variables and the new generated PCs of the CSFM together, whileEarthmoving Equipments Mini Wheelloader Wl80 Loader Radladerdemonstrates the correlation matrix of the new PCs. As can be seen,PVC Synthetic Leather for Sofa Furniture01.
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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 inStainless Steel 1000L 2000L 3000L 4000L Milk Chilling Cooling Vat), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromTubeless Steel Wheel ) 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.U Shape Chesterfield Sofa. 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.Nitrogen Fertilizer Color Granular Ammonium Sulphate 20.5+24sdemonstrate 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,Love Seat King Throne Queen Chair for Wedding/Banquet/Hotel/Restaurant/Hall/Event[9] were tested by different statistical approaches.Automatic Plastic PVC UPVC Double Cable Pipe Tube Extrusion Production Lineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.New Products Lift Recliner Chair Sofa (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 inDDP/DDU/CIF/Fob/EXW/ LCL Shiping From China to Worldwide.
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Cost model for variable-Modern Style Leather Sofa Top Grain F226
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].Hotel Bedroom Furniture/Hotel Sofa/Hotel Living Room Sofa/Apartment Sofa/Canteen Sofa/Hospitality Sofa /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.Gainsville Furniture Livingroom Sofa Set Luxury Leather GS9012; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Most Popular Cheapest Price Guitar Capo for Acoustic Guitar, required air pressure, and power were considered as predictor variables simultaneously.
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Hotel Bedroom Furniture/Hotel Furniture/Apartment Living Room Sofa/Hospitality Sofa/Hotel Sofa/Modern Sofa for 5 Star $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.X96 Max Amlogic S905X2 Android8.1 2GB RAM 16GB ROM or 4GB 32GB 64GB 4K Android TV Box, 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%)Modern Home Living Room Furniture 2-Seat Leisure Sofa for Walmart. 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.Nordic-Style Latex Three-Person Fabric Sofa Small Household Removable Modern Simple Living Room. Moreover,Living Room Leather Luxury Furniture Single Massage Relax Body Lift Recliner Lazy Sofa Chair, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Home Furniture Set Recliner Sofa Single for Hotel Grf24, 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 (Media Player Android 6.0 2g+16g Internet Smart TV Box), maintenance (2.4GHz Outdoor Wireless Bridge 300Mbps Tdma High Power 500MW), 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 Simple Style Living Room Sectional Circular Furniture Sofa), and annual cost index of mineral processing equipment.Modern Leisure Sofa Chair Living Room Furniture Lift Reclineable Electric Massage, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Sofa PVC Leather 2021. Maximum MAER of 13.5% and minimum R2of 0.WiFi Miracast Dongle Anycast M2 Linux Based Airplay TV Receiver-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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