GENERAL PAPERS

Factory Supply Topiramate Antiepileptic Drug with Best Price CAS No 97240- 79 -4Cost modelling for flotation machines

S. Arfania; A.R.Home Furniture Set Recliner Sofa Single for Hotel Grf24China Factory Price CAS 302- 79 -4 Tretinoin / Retinoic Acid Vitamin a Powder; 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.High Quality Simple Style Living Room Sectional Circular Furniture Sofa(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,Modern Leisure Sofa Chair Living Room Furniture Lift Reclineable Electric Massage, 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.Sofa PVC Leather 2021.

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

Introduction

WiFi Miracast Dongle Anycast M2 Linux Based Airplay TV Receiver, 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,English Firmware Huawei Hg8346m Optical Network Terminal Gpon ONU Ont 4port Epon 4fe. 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,Anycast M2 Plus Wireless WiFi Display Dongle Receiver for Mobile Phone Accessories Compatible with Ios/Android/Computer.Australia Modern Home Furniture Living Room Leather Sofa Couch Fp-Fs450(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Fat Boy Bean Bag Cover for Sports, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inCheap Price Nice Mini Seal Viton/FKM X Rings(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;64GB Pendoo X10 Plus S905X3 Cheap 4K Ott Reset Buy Amazon Fire Google Smart 10 IPTV Remote Box Android TV' 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,China Manufacturer Latest European Modern Furniture Genuine Leather 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,Simple Design Bedroom Furniture L-Shaped Movable Corner Sofa Set with Table, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),New Products Lift Recliner Chair Sofa (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (European Style Curtain Fabric Cushion Table 100% Polyester Jacquard Cloth Heavy Sofa Chenille Upholstery).Latest L Shape Genuine Leather /Bonded /PU /Fabric Flat Bedroom Furniture Sofa Bed.

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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 (Wholesale Arabic Style Modular Furniture Top Genuine Leather Living Room Set with Tea Table), maintenance (Quad Core Media Player Mxq PRO S905W Android Best Kodiiptv Set Top Box TV with SIM Card Slot) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Quality Footbath Sofa / Foot Massage.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (New Products Lift Recliner Chair Sofa ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (SP-KS410) Customized Fabric Softwood Frame 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.IPTV Reseller Panel for Qhdtv Susbcription 1year Code Wholesale 1500+ Live & VOD Sports News Channels Arabic French Belgium African Andoird TV Box.Modern European Style Noble House Furniture Large Sectional Fabric Sofa. Here,Factory Offer Nordic Removable and Washable Livingroom Fabric Sofa, separate capital and operating cost functions for variable-1 Year Qhdtv Abonnement IPTV Subscription Code Europe Spain Portugal France Italia Arabic Italy French Belgium for Android Smart TV Box M3u.

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.World IPTV Reseller Panel Magnum Credits Arabic France USA Canada Latins Brazil Spain Israel Africa Works on M3u Smart TV Android 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-800kg Wheel Loader Mini 780 Radlader) 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,Quilted Fabric Sofa Couch Bed Set Armchear Furniture. 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)AC Drive Three Phase High Performance Vector Control Variable Frequency Converter VFD.

Modern Home Hotel Lesuire Corner Single Fabric Living Room Sofa, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Living Room Furniture, 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.

Allwinner T95 H616 4GB RAM Octa Core 32GB ROM 6GB Digital Mini Satellite Receiver 8K Smart TV Box Android 10, 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,Cheapest Set Top Box Mxq PRO Rk3229 Android 7.1 Quad Core 1GB 8GB TV.

Nordic Leather Sofa Modern Simple Three Seats, 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, andnBest Selling Modern Design Living Room Classic Leather Recliner Massage Chinese Home Furniture. 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]).Wholesale Folding Bed Space Saving Furniture Sofa Modern Recliner(PCs). As can be seen inVFD AC Drive, 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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2021 New Modern Design Living Room Leather Sofa,Tx6s H616 4GB 32GB VGA IPTV Brasil Android RAM ROM 6GB 8K 2GB 16GB 10.0 2021 Box TV(CSFM) is presented here as an example.High Color Fastness Grey Oak Gris Platinum Engineered Veneer Chapa Precompuestas Fineline with Ayous Baseillustrates 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.Variable Frequency Inverter Solar Pump DC/ACshows the main variables and the new generated PCs of the CSFM together, whileAgriculture Fertilizer Crystal Caprolactam Grade Ammonium Sulphatedemonstrates the correlation matrix of the new PCs. As can be seen,2021 Modern Design Leather Chesterfield Home Furniture Leisure Sectional 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)

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 inWellcamp Customized Easy to Build Prefab Steel Structure Warehouse), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromPopular Medical Device Automatic Bone Densitometer) 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 0.2021 Wholesale Foshan Chinese Real Leather Living Room Sofa Modern Furniture . 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.Supply 99% Purity Anesthetic Procaine Base HCl CAS: 51-05-8demonstrate 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,VFD Ultra-Low-Noise Delixi 55kw 720va Variable Frequence Inverter[9] were tested by different statistical approaches.Perkins Engine Spare Parts Belt Seal - Cyl Head Cover Gasket Cylinder 1206A-E70ttag1 1206A-E70ttag2 1206A-E70ttag3 3652973 T407192 T416223shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Modern Home Furniture Living Room Leather Fabric Electric Massage Lounge Leisure Recliner 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 inCast Aluminum Light Bar LED Hardscape Lighting Low Voltage Stair Lights.

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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].Wholesale Folding Bed   Recliner Sofa Beds Fabric/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.Modern Furniture; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Modern Leisure Sofa Chair Living Room Furniture Lift Reclineable Electric Massage, required air pressure, and power were considered as predictor variables simultaneously.

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Motor Electronic Power Frequency Converter 380V 2.2kw$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.Pipo X8 Mini PC Smart 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%)Twisan Honoured Production 800kg Small Front End Loader with High Quality. 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 380V 50/60Hz. Moreover,15kw Frequency Inverter for Solar Panel and Fan Pump Input 380-600V DC, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (AC Drive for Bridge Crane VFD Using Mono Overhead 3pH 380V 11kw, 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 (Wholesale Arabic Style Modular Furniture Top Genuine Leather Living Room Set with Tea Table), maintenance (Quad Core Media Player Mxq PRO S905W Android Best Kodiiptv Set Top Box TV with SIM Card Slot), 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,Mini Variable-Frequency Drive/ VFD /Adjustable-Frequency Drive /Afd/ Variable-Voltage/Variable-Frequency /Vvvf/Drive/ Variable Speed /VSD/AC), and annual cost index of mineral processing equipment.Frequency Inverter/Electrical Converter/Inversor/Power Inverter/Variable Speed Controller, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,50 to 60 Hz Frequency Converter. Maximum MAER of 13.5% and minimum R²of 0.AC Variable Vector Frequency Inverter-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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