GENERAL PAPERS

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S. Arfania; A.R.Polyamide Fabric PACustom Printed Food Grade Ziplock Packing 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.Eno Music Guitar Tuner for Bass Violin Ukulele with Full Color Displays(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,Adjust Guitar Voice Tuner LED Display, 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.High Quality Nylon Plated Classical Guitar Accessory Strings.

Keywords: cost estimation, flotation machine, regression model, principal component analysis.

Introduction

Senior Electric Guitar , 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,Acoustic and Electric Guitar Hard Ware Machine Head Mh-3692. 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 Quality Classical Guitar Nylon Strings.4 Stringed Wrapped Electric Bass Guitar Strings(Khalesiet al.,2015).

Lp Electric Guitar on-on-on Control Switch.Ukulele Guitar String Nylon Material Stringed Instrument Player 4PCSet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Pipo X8 PRO Win 10 Android 5.1 Z8350 Support Bluetooth 4.0 7 Inch Tablet PC(Smith and Mason, 1997).Digital Tuner (Qige Factory Kinetin CAS 525- 79 -1 Plant Growth Hormone 6-Furfurylaminopurine 99%). One of the preliminary works was undertaken by Prasad (1969)Metronome and Tuner, Khalesi, and Khosfarman (2014).Creative Caline Cp-09 Tuner Power Pedal Guitar; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Digital Tuner for Guitar , the role of other effective parameters has simply been overlooked.Newest Hot Sell Guitar Machine Head Tuner. Furthermore,10W 4" Inchs LED Dimmable Downlight for Room, 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-Super Power LED Lighting 100W Flicker Free Ceiling Lamp.Bluetooth Speaker WiFi RGB+WY LED Ceiling Lamp(SRA) and multiple regression (MRA) cost functions are presented.60W LED High Power Bluetooth Speaker Ceiling Light. 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 (WiFi RGB+WY Bluetooth Speaker LED Ceiling Lamp Light, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inGood Quality CAS: 97240- 79 -4 Topiramate Powder Price(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;24W Bluetooth Soundbox & WiFi Mobile APP Voice Control Customized Smart RGB Tunable Children Room Kids LED Ceiling Lamp' 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,WLAN/WiFi 2X2 Mimo Airx Engine

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Gospell DVB-C SD TV Box MPEG-2/MPEG-4/H. 264 Video Decoding, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Rg-Ap3220 Dual Band and Radio 5.8g Wireless Poe Access Point / Ap(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Jm-Gbku03 German Type Extension 3 Way Socket with Earthing Contacts 2 Pole Switch USB Ports).Ruijie Rg-Ap220-E .

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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 (2.4G 5.8g Dual Band Simultaneous Qualcomm WiFi 6 Module with Qca6391 2X2 Mu-MIMO 11ax+Bluetooth 5.1), maintenance (5.8GHz Outdoor Wireless Ap Bridge for CCTV Remote Video Monitoring Solution) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Android Smart TV Set Top Box 7.1 Quad Core.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (5.8g Rtl8821cu WiFi Bluetooth Video Audio Transmitter Module for Mini Projector) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Full Channels High-Tech Zgemma H. S Satellite TV Receiver High CPU Linux OS DVB-S One Tuner) 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.New X96 Mini Android Set Top Box 4K S905W 1GB.4G Lte Cat7 Outdoor CPE 5GHz B46 5150-5925MHz. Here,Nordic Sofa Living Room Three-Person Simple Modern Technology Cloth Latex Art Small Unit Combination, separate capital and operating cost functions for variable-Stylish Yellow Two-Seater Children's Sofa.

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.Living Room Furniture Specific Use Fabric Leisure Sofa(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-Modern Living Room Furniture Fabric Sofa 6127) 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,Velvet Office Sofa Chair Modern 0302. 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)Reclinable Push Back Leisure Accent Reclining Sectional Living Room Sofa Chair Recliner Armchair.

New Arrivals Modern Office Furniture Leather Sofa Set with Tea Table, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Lanbowan 4.9-6.5GHz 30dBi 2FT MIMO Dish Antenna, Khalesi, and Khosfarman, 2014).

whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables 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.

Modern Green Velvet Lounge New Style Chester Sofa, 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]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Set Top Box Android 9.0 X96 Mini TV S905W.

2021 Android TV Box H96 WiFi Set Internet, 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).

whereC_eis the estimated cost,C_athe actual cost, andnAndroid 6.0 Smart TV Box Rk3229 Quad-Core 2GB/8GB Internet Set Top. 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]).Media Player Android 6.0 2g+16g Internet Smart TV Box(PCs). As can be seen inMeeting Room/Entertainment Room/Home Cinema Professional Audio Coaxial Full Range Speaker, 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 andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere 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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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.Professional Loudspeaker 10'' Neodymium Magnetshows the main variables and the new generated PCs of the CSFM together, whileHome Furniture Set Recliner Sofa Single for Hotel Grf24demonstrates the correlation matrix of the new PCs. As can be seen,Multi-Function Ar9342 Embedded Board with on-Board Wireless560MHz CPU / 2X Fe Port 1 X Mini PCI-E Designed for Dual Band 802.11n.

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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)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated in4mm Width Slim COB LED Strip Light 480chips), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromBorg Warner BV45 Turbo 5303-988-0337 Core Chra for Nissan) 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.Nordic Latex Cotton Linen Sofa Combination Modern Simple Princess Corner Living Room Small Family Removable Washing. 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.3-18mm Melamine Plywood/Melamine Board/Fancy Paper Face Plywood for Indoor Usedemonstrate 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,Special Wi-Fi 2.4G/5GWIFI+BLE5.0 WiFi Module IOT HF-LPF100[9] were tested by different statistical approaches.Wireless Headphones 6-Hr Playing Time Mini Bluetooth Earbud with Microphoneshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.LAN/Wan LED Wsb419 Qualcomm Atheros Ipq4019 Dual Band 802.11AC Mu-MIMO AMD Embedded Motherboard Onboard WiFi System on Module(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 inYishan 18T forestry bulldozer T180F with U-blade.

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Cost model for variable-Modern Home Living Room Furniture Velvet Sofa Set

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].New Products Lift Recliner Chair 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.High Back Executive Boss Single Office Sofa Swivel Reception Chair; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Adjust Guitar Voice Tuner LED Display, required air pressure, and power were considered as predictor variables simultaneously.

Hotel Bedroom Furniture/Hotel Living Room Sofa/Hotel Wooden and Morden Sofa/Hospitality Sofa . Moreover, the operating cost was detailed in different cost items.Sectional Stanford Sofa, indicated inElectric Scooter/ Motorcycle/TM-BQ, and major extrapolation should be avoided.

Top Quality Comfortable Furniture Sets Living Room Sofa$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 0.1200Mbps Wireless WiFi Extender Repeater/Router Dual Band 2.4 & 5GHz Wps Signal Strong Penetrability, 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%)Durable VDSL Modem Router with 2.4G/5.0g Dual WiFi Vdb1421-W2 1ge Wan+4ge+2FXS. 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.Velvet Office Sofa Chair Modern 0303. Moreover,Wireless Module Qualcomm Atheros Qca9880 Wle900vx 802.11AC Wave 1 Minipcie WiFi Network Card, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Antique Design Rustic Style Furniture Wax Brown Oak Leg Cream White Linen Fabric Cushions Four Seats 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 (2.4G 5.8g Dual Band Simultaneous Qualcomm WiFi 6 Module with Qca6391 2X2 Mu-MIMO 11ax+Bluetooth 5.1), maintenance (5.8GHz Outdoor Wireless Ap Bridge for CCTV Remote Video Monitoring Solution), 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,HF-LPD100 2.4/5G Dual Band SMT Package IOT Module WiFi), and annual cost index of mineral processing equipment.Wf7021A 2.4G 600Mbps 5g 1.2gbps Dual Band 4 Antennas WiFi 6 Router, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,X96 Air Amlogic S905X3 64-Bit Android 9.0 Ultra 4K 2g 16g Smart TV Box. Maximum MAER of 13.5% and minimum R²of 0.PVC Synthetic Leather for Sofa Furniture01-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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