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Hotel Bedroom Furniture/Hotel Sofa/Hotel Living Room Sofa/Apartment Sofa/Canteen Sofa/Hospitality Sofa Cost modelling for flotation machines

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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.Dpc Diphenyl Carbonate CAS 102-09-0(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,Bloom Tech Chemical Material Topiramate CAS 97240- 79 -4, 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 0.100% Water Soluble Vitamin a Palmitate Powder Retinyl.

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

Introduction

China Supplier of CAS 702- 79 -4 1, 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,Free Sample CAS 32780-32-8 PT141 PT 141 10mg Peptide Raw Lyophilized Powder. 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 Aod-9604 CAS 221231-10-3 Aod 9604 Peptides 2mg for Loss Weight.CAS 79 -57-2 Oxytetracycline(Khalesiet al.,2015).

Azd3759 CAS No. 1626387-81-2.Food Additives L-Arginine with Top Qualityet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Hot Selling Electric Race Vietnam Motorcycle Tire (Smith and Mason, 1997).Chemical Reagent Bloom Tech Sodium 4-Methylbenzenesulfinate CAS 824- 79 -3(Two-Way Single 10 " Professional Waterproof Speaker). One of the preliminary works was undertaken by Prasad (1969)99% Purity 1, Khalesi, and Khosfarman (2014).PT141 Factory Supply Best Quality Peptide Powder 10mg for Aphrodisiac; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High-Purity Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol China Factory Direct Sales, the role of other effective parameters has simply been overlooked.2-Aminoanthraquinone CAS No 117- 79 -3. Furthermore,High Quality Tretinoin 302- 79 -4 with Good Price, 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-3-Amino-4-Pyrazolecarboxamide Hemisulfate Salt CAS No 27511- 79 -1.Free Sample Ortho Phthalaldehyde 643- 79 -8 with Fast Delivery Manufacture in China(SRA) and multiple regression (MRA) cost functions are presented.High Fidelity Professional Line Array Speaker . 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 (N, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inThree Wheel Trolley Tube Type Tire 90/90-18(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Vitamin a Palmitate CAS 79 -81-2' 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,New Arrival Mr Series Audio Mixer with DSP Mr-12fx

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Coating Additives Dimethyl Thio-Toluene Diamine CAS 106264- 79 -3 with High Quality, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Powered Speaker System for Home Theater(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Plastic Chrome Plating Car Emblem ABS Badge).Cosmetic Grade L-Arginine with High Quality.

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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 (320000 Iu CAS127-47-9 Retinyl Vitamin a Acetate/Retinol Acetate), maintenance (Chinese Factory Special Cosmetic Raw Materials for Wrinkle Removal and Moisturizing High Purity Nano Liposomal Hydroxypropyl Tetrahydropyrantriol) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Best Quality Skin Care Pure Tretinoin 302- 79 -4.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Factory Direct Sale Dimethyl Gonane 702- 79 -4) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Phthalaldehyde CAS 643- 79 -8) 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.Chlorhexidine Diacetate CAS No 206986- 79 -0.CAS 79 -14-1 Glycolic Acid 70%. Here,Compact Neodymium Line Array 12inch 400W Passive Speaker PA System, separate capital and operating cost functions for variable-Professional 10 " Aluminum Speaker Basket.

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.New Arrival Mr Series Audio Mixer with DSP Mr-10fx(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-Factory Price Powder Mannitol with High Quality) 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,Outdoor Line Array PA System Loudspeaker. 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)Karaoke Wireless Portable Wooden Bluetooth PA Speaker.

12" Line Array Loud Speaker Sound System Professional PA, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (15inch Professional Stereo Sound PA PRO Audio DJ Loud Speaker, 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.

Professional Line Array PA System S1210 Sound, 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,Cosmetic Material 99% Purity Tretinoin Powder.

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whereC_eis the estimated cost,C_athe actual cost, andnSpts. 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]).High Power DJ Sound Equipment System Line Array PA Speaker(PCs). As can be seen inSingle 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730, 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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Best Price Medicine Grade Lanosterol Powder,Outdoor Professional Audio Loudspeaker PA Stage Active Line Array(CSFM) is presented here as an example.90/90-21 China Super Cheap Motorcycle Tire/Tyreillustrates 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.12V AC/DC 18W/24W/30W/40W/55W Resin Filled PAR56 Nichless Swimming Pool Light with 2 Years Warrantyshows the main variables and the new generated PCs of the CSFM together, whileHigh Temperature 3 Side Seal Retort Pouch for Corndemonstrates the correlation matrix of the new PCs. As can be seen,PRO Dante Audio 30W DSP 6 Inch Plastic Mini Active in Wall Mounted Loud Speaker Pairs Supports 24VDC or Poe Power for PA System Public Address.

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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 inAccept Customization Mini Perfume with Good Price), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromLevamisole HCl Anthelmintic Agent Hydrochloride Raw CAS 16595-80-5) 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.Cosmetic Grade L-Arginine with Best Price. 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.Factory-Engineer White Oak Veneer in 0.25mmdemonstrate 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,Anti-Wrinkle and Aging Chemical Raw Materials[9] were tested by different statistical approaches.Active Compact Column PA Speaker Powered Loudspeaker Point Sourceshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Quality Free Sample Ortho Phthalaldehyde 643- 79 -8 with Fast Delivery(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 inUsed Swamp Track Dozer Cat D5n.

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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].Professional Sound Speaker Single 8 Inch Portable Stage Monitor PS8r2/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.Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetate; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Bloom Tech Chemical Material Topiramate CAS 97240- 79 -4, required air pressure, and power were considered as predictor variables simultaneously.

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White Powder Vitamin a for Food and Feed Grade$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.Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol, 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%)Professional Line Array Speaker Neodymium Af15. 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.Manufacturer Supply CAS 79 -14-1 Glycolic Acid 70% 99% Cosmetic Grade. Moreover,Q210 Passive PA Speaker System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Retinol Palmitate/Vitamin a Palmitate Oil as Food Ingredient, 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 (320000 Iu CAS127-47-9 Retinyl Vitamin a Acetate/Retinol Acetate), maintenance (Chinese Factory Special Cosmetic Raw Materials for Wrinkle Removal and Moisturizing High Purity Nano Liposomal Hydroxypropyl Tetrahydropyrantriol), 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,Professional 24 Channels Digital Audio Mixer Console), and annual cost index of mineral processing equipment.100% Natural Huperzia Serrata Extract 1% 5% 99% Huperzine a Brown Powder Supplements, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Skin Care Raw Material Vitamin a Palmitate Powder. Maximum MAER of 13.5% and minimum R²of 0.Lf Drivers 10 Inches Professional Speaker Pw1032-64-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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