GENERAL PAPERS

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S. Arfania; A.R.Modern Green Velvet Lounge New Style Chester SofaAutomatic Bottle PE Film Shrink Wrapping Packing Machine ; 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.Set Top Box Android 9.0 X96 Mini TV S905W(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,2021 Android TV Box H96 WiFi Set Internet, 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.Android 6.0 Smart TV Box Rk3229 Quad-Core 2GB/8GB Internet Set Top.

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

Introduction

Media Player Android 6.0 2g+16g Internet Smart TV Box, 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,2.4GHz Outdoor Wireless Bridge 300Mbps Tdma High Power 500MW. 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,4800-6500MHz 29dBi MIMO Dish Antenna 28dBi Parabolic.5GHz High Power Outdoor Wireless CPE Ap by Factory Isigal(Khalesiet al.,2015).

Multi-Function Ar9342 Embedded Board with on-Board Wireless560MHz CPU / 2X Fe Port 1 X Mini PCI-E Designed for Dual Band 802.11n.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 Cardet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2021 Fashion Electric Mtorcycle 2000W Motor China(Smith and Mason, 1997).Nordic Latex Cotton Linen Sofa Combination Modern Simple Princess Corner Living Room Small Family Removable Washing(500W/ 800W Brushless Motor Electric Mobility Scooter for Cargo ). One of the preliminary works was undertaken by Prasad (1969)Special Wi-Fi 2.4G/5GWIFI+BLE5.0 WiFi Module IOT HF-LPF100, Khalesi, and Khosfarman (2014).LAN/Wan LED Wsb419 Qualcomm Atheros Ipq4019 Dual Band 802.11AC Mu-MIMO AMD Embedded Motherboard Onboard WiFi System on Module; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Modern Home Living Room Furniture Velvet Sofa Set, the role of other effective parameters has simply been overlooked.New Products Lift Recliner Chair Sofa . Furthermore,High Back Executive Boss Single Office Sofa Swivel Reception Chair, 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-Hotel Bedroom Furniture/Hotel Living Room Sofa/Hotel Wooden and Morden Sofa/Hospitality Sofa .Sectional Stanford Sofa(SRA) and multiple regression (MRA) cost functions are presented.Top Quality Comfortable Furniture Sets Living Room 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 (1200Mbps Wireless WiFi Extender Repeater/Router Dual Band 2.4 & 5GHz Wps Signal Strong Penetrability, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChina Cheap Colour Optional Electric Motorcycle for Adults(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Durable VDSL Modem Router with 2.4G/5.0g Dual WiFi Vdb1421-W2 1ge Wan+4ge+2FXS' 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,Wf7021A 2.4G 600Mbps 5g 1.2gbps Dual Band 4 Antennas WiFi 6 Router

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,X96 Air Amlogic S905X3 64-Bit Android 9.0 Ultra 4K 2g 16g Smart TV Box, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),PVC Synthetic Leather for Sofa Furniture01(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (New Customized LED Auto Sign Car Logo Design for Skoda).Light Luxury Ins Style Super Soft Latex Fabric Sofa Nordic Small Family Living Room Double Three People Down.

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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 (U Shape Chesterfield Sofa), maintenance (Love Seat King Throne Queen Chair for Wedding/Banquet/Hotel/Restaurant/Hall/Event) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,New Products Lift Recliner Chair Sofa .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Modern Style Leather Sofa Top Grain F226) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Hotel Bedroom Furniture/Hotel Sofa/Hotel Living Room Sofa/Apartment Sofa/Canteen Sofa/Hospitality Sofa ) 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.Gainsville Furniture Livingroom Sofa Set Luxury Leather GS9012.Simple Upholstered Copper Nail Vintage Style Velvet Lounge Sofa. Here,Modern Antique Reproduction French Metal Sofa, separate capital and operating cost functions for variable-Hotel Bedroom Furniture/Hotel Furniture/Apartment Living Room Sofa/Hospitality Sofa/Hotel Sofa/Modern Sofa for 5 Star .

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.X96 Max Amlogic S905X2 Android8.1 2GB RAM 16GB ROM or 4GB 32GB 64GB 4K Android 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-Modern Home Living Room Furniture 2-Seat Leisure Sofa for Walmart) 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,Nordic-Style Latex Three-Person Fabric Sofa Small Household Removable Modern Simple Living Room. 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)Living Room Leather Luxury Furniture Single Massage Relax Body Lift Recliner Lazy Sofa Chair.

Home Furniture Set Recliner Sofa Single for Hotel Grf24, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (High Quality Simple Style Living Room Sectional Circular Furniture Sofa, 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 Leisure Sofa Chair Living Room Furniture Lift Reclineable Electric Massage, 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,Sofa PVC Leather 2021.

WiFi Miracast Dongle Anycast M2 Linux Based Airplay TV Receiver, 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, andnEnglish Firmware Huawei Hg8346m Optical Network Terminal Gpon ONU Ont 4port Epon 4fe. 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]).Anycast M2 Plus Wireless WiFi Display Dongle Receiver for Mobile Phone Accessories Compatible with Ios/Android/Computer(PCs). As can be seen inFlying Online Fiber Laser Marking Machine with Conveyor Belt, 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.100% Copper Wire St Series Single Phase Generator / Alternator shows the main variables and the new generated PCs of the CSFM together, whileChina Everun Er408t 0.8ton Truck Front Engine Shovel Hydraulic Bucket Small Mini Wheel Loaders for Saledemonstrates the correlation matrix of the new PCs. As can be seen,Anycast M9 Plus WiFi Display Dongle Receiver 1080P HDMI TV Dlna Airplay Miracast Universal for Ios/Mac/Android.

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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 in2021 New Arrival Unshrinking No Irritating Smell Cracking Gel Polish), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromFrequency Converter with SVC and Vf Control 380V 50/60Hz) 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.Chinese Wooden Silver-Leaf Classical Fabric 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.99% Proparacaine Hydrochloride / HCl CAS 5875-06-9demonstrate 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,Enterprise Application and Openvpn WiFi Router 300Mbps 2.4GHz& 5GHz Dual Band[9] were tested by different statistical approaches.Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Hotel Bedroom Furniture/Hotel Furniturecombination Sofa/Hotel Modern Sectional Sofa/Living Room Sofa/Corner Sofa/Upholstery Fabric 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 inCrystals Prom Party Dress Vestidos V-Neck Tulle Evening Dresses Teal Lady Gowns.

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Cost model for variable-Modern Simple Hotel Lobby Discussion Living Room Leisure 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].Sofa Set Fabric Velvet Furniture/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.OEM PVC Home Suede Inflatable Sofa with Footstool; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,2021 Android TV Box H96 WiFi Set Internet, required air pressure, and power were considered as predictor variables simultaneously.

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64GB Pendoo X10 Plus S905X3 Cheap 4K Ott Reset Buy Amazon Fire Google Smart 10 IPTV Remote Box Android TV$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.Living Room Lounge Furniture Sofa Fabric 3 Seater Couch, 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%)Stable Quality 1year Qhdtv HD IPTV Abonnement Reseller Panel Lxtream Code All Europe Italy UK USA Spain France Arabic Morocco Channel. 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.Customization Available Modern Popular Home Furniture Set Living Room Leather Sofa. Moreover,Cafe Bar Table Wrought Iron Home Living Room Dining, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (China Manufacturer Latest European Modern Furniture Genuine Leather 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 (U Shape Chesterfield Sofa), maintenance (Love Seat King Throne Queen Chair for Wedding/Banquet/Hotel/Restaurant/Hall/Event), 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,Simple Design Bedroom Furniture L-Shaped Movable Corner Sofa Set with Table), and annual cost index of mineral processing equipment.New Products Lift Recliner Chair Sofa , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Latest L Shape Genuine Leather /Bonded /PU /Fabric Flat Bedroom Furniture Sofa Bed. Maximum MAER of 13.5% and minimum R²of 0.Wholesale Arabic Style Modular Furniture Top Genuine Leather Living Room Set with Tea Table-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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