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Polycrystalline PCD Diamond Wire Drawing Die Rod for Bunching Stamping
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
Meeting Room/Entertainment Room/Home Cinema Professional Audio Coaxial Full Range SpeakerCost modelling for flotation machines
S. Arfania; A.R.Digital Tuner High Quality Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports; 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.Metronome and Tuner(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,Creative Caline Cp-09 Tuner Power Pedal 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.Digital Tuner for Guitar .
Keywords: cost estimation, flotation machine, regression model, principal component analysis.
Introduction
Newest Hot Sell Guitar Machine Head Tuner, 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,10W 4" Inchs LED Dimmable Downlight for Room. 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,Super Power LED Lighting 100W Flicker Free Ceiling Lamp.Bluetooth Speaker WiFi RGB+WY LED Ceiling Lamp(Khalesiet al.,2015).
60W LED High Power Bluetooth Speaker Ceiling Light.WiFi RGB+WY Bluetooth Speaker LED Ceiling Lamp Lightet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2021 New Removable Battery 350W Motor Scooter Electric Motorcycle for Adult(Smith and Mason, 1997).24W Bluetooth Soundbox & WiFi Mobile APP Voice Control Customized Smart RGB Tunable Children Room Kids LED Ceiling Lamp(VFD Motor Drive Inverter Converter 1.5kw / 2.2kw 220V Variable Frequency). One of the preliminary works was undertaken by Prasad (1969)Most Popular Cheapest Price Guitar Capo for Acoustic Guitar, Khalesi, and Khosfarman (2014).Guitar / Bass Tuner ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,1200Mbps Realtek Rtl8812au Chipset Gigabit 11AC Dual Band WiFi USB Adapter Wireless Stick, the role of other effective parameters has simply been overlooked.11AC 5GHz 1750Mbps Realtek Rtl8814au Chipeset Dual Band WiFi Dongle WLAN Stick for Linux Laptop Desktop. Furthermore,WLAN/WiFi 2X2 Mimo Airx Engine, 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-Gospell DVB-C SD TV Box MPEG-2/MPEG-4/H. 264 Video Decoding.Rg-Ap3220 Dual Band and Radio 5.8g Wireless Poe Access Point / Ap(SRA) and multiple regression (MRA) cost functions are presented.Ruijie Rg-Ap220-E . 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 (2.4G 5.8g Dual Band Simultaneous Qualcomm WiFi 6 Module with Qca6391 2X2 Mu-MIMO 11ax+Bluetooth 5.1, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inProfessional Loudspeaker 10'' Neodymium Magnet(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;5.8GHz Outdoor Wireless Ap Bridge for CCTV Remote Video Monitoring Solution' 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,4G Lte Cat7 Outdoor CPE 5GHz B46 5150-5925MHz
►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Nordic Sofa Living Room Three-Person Simple Modern Technology Cloth Latex Art Small Unit Combination, blowers, and launders.
The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Stylish Yellow Two-Seater Children's Sofa(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Plastic Figure Toy in Different Characters).Living Room Furniture Specific Use Fabric Leisure Sofa.
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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 (Modern Living Room Furniture Fabric Sofa 6127), maintenance (Velvet Office Sofa Chair Modern 0302) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Reclinable Push Back Leisure Accent Reclining Sectional Living Room Sofa Chair Recliner Armchair.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.
The overhaul costs (New Arrivals Modern Office Furniture Leather Sofa Set with Tea Table) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Lanbowan 4.9-6.5GHz 30dBi 2FT MIMO Dish Antenna) 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.Modern Green Velvet Lounge New Style Chester Sofa.Set Top Box Android 9.0 X96 Mini TV S905W. Here,2021 Android TV Box H96 WiFi Set Internet, separate capital and operating cost functions for variable-Android 6.0 Smart TV Box Rk3229 Quad-Core 2GB/8GB Internet Set Top.
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.Media Player Android 6.0 2g+16g Internet Smart TV Box(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-2.4GHz Outdoor Wireless Bridge 300Mbps Tdma High Power 500MW) 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,4800-6500MHz 29dBi MIMO Dish Antenna 28dBi Parabolic. 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)5GHz High Power Outdoor Wireless CPE Ap by Factory Isigal.
Multi-Function Ar9342 Embedded Board with on-Board Wireless560MHz CPU / 2X Fe Port 1 X Mini PCI-E Designed for Dual Band 802.11n, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (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, 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.
Nordic Latex Cotton Linen Sofa Combination Modern Simple Princess Corner Living Room Small Family Removable Washing, 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,Special Wi-Fi 2.4G/5GWIFI+BLE5.0 WiFi Module IOT HF-LPF100.
LAN/Wan LED Wsb419 Qualcomm Atheros Ipq4019 Dual Band 802.11AC Mu-MIMO AMD Embedded Motherboard Onboard WiFi System on Module, 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, andnModern Home Living Room Furniture Velvet Sofa Set. 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]).New Products Lift Recliner Chair Sofa (PCs). As can be seen inGy6 -80 Motorcycle Parts Starting Motor Gear, 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]:
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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Hotel Bedroom Furniture/Hotel Living Room Sofa/Hotel Wooden and Morden Sofa/Hospitality Sofa ,Sectional Stanford Sofa(CSFM) is presented here as an example.Borg Warner BV45 Turbo 5303-988-0337 Core Chra for Nissanillustrates 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.Super Bright Outdoor 300W 400W 500W 600W 800W 1000W LED Flood Lightshows the main variables and the new generated PCs of the CSFM together, while3-18mm Melamine Plywood/Melamine Board/Fancy Paper Face Plywood for Indoor Usedemonstrates the correlation matrix of the new PCs. As can be seen,Top Quality Comfortable Furniture Sets Living Room Sofa.
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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 inBlack Chiffon Stretch Party Prom Gowns Long Sleeves Evening Dress Sexy V Neck Front Split Women Beading Waist), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromYn725 Yineng Mini Wheel Loader 25kw) 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.Durable VDSL Modem Router with 2.4G/5.0g Dual WiFi Vdb1421-W2 1ge Wan+4ge+2FXS. 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.Pneumatic Three Four Spindles Multi-Heads CNC Router Woodworking Machinedemonstrate 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,Velvet Office Sofa Chair Modern 0303[9] were tested by different statistical approaches.Auto Parts Laser Printing Machine Marking System Engraving Equipmentshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Wireless Module Qualcomm Atheros Qca9880 Wle900vx 802.11AC Wave 1 Minipcie WiFi Network Card(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 inAluminium Solar Column Lighting/ Lamp Post/ LED Garden Light/ Light Fixture Outdoor/Solar Wall and Pillar.
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Cost model for variable-Antique Design Rustic Style Furniture Wax Brown Oak Leg Cream White Linen Fabric Cushions Four Seats Sofa
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].HF-LPD100 2.4/5G Dual Band SMT Package IOT Module WiFi/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.Wf7021A 2.4G 600Mbps 5g 1.2gbps Dual Band 4 Antennas WiFi 6 Router; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Creative Caline Cp-09 Tuner Power Pedal Guitar, required air pressure, and power were considered as predictor variables simultaneously.
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Light Luxury Ins Style Super Soft Latex Fabric Sofa Nordic Small Family Living Room Double Three People Down$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.U Shape Chesterfield Sofa, 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%)Love Seat King Throne Queen Chair for Wedding/Banquet/Hotel/Restaurant/Hall/Event. 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.New Products Lift Recliner Chair Sofa . Moreover,Modern Style Leather Sofa Top Grain F226, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Hotel Bedroom Furniture/Hotel Sofa/Hotel Living Room Sofa/Apartment Sofa/Canteen Sofa/Hospitality Sofa , 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 (Modern Living Room Furniture Fabric Sofa 6127), maintenance (Velvet Office Sofa Chair Modern 0302), 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,Gainsville Furniture Livingroom Sofa Set Luxury Leather GS9012), and annual cost index of mineral processing equipment.Simple Upholstered Copper Nail Vintage Style Velvet Lounge Sofa, and over- extrapolation could result in misguiding estimates.
The MAER, RMSE, R2,Modern Antique Reproduction French Metal Sofa. Maximum MAER of 13.5% and minimum R2of 0.Hotel Bedroom Furniture/Hotel Furniture/Apartment Living Room Sofa/Hospitality Sofa/Hotel Sofa/Modern Sofa for 5 Star -feasibility and even feasibility study level of projects.
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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, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.Journal of Civil Engineering and Management,vol. 18, no. 3. pp 378-385. [Balck Sulphur Br 200% / Black Dyes]
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Paper received Apr. 2015
Revised paper Received Jul. 2016
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