GENERAL PAPERS

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S. Arfania; A.R.Outdoor Professional Audio Loudspeaker PA Stage Active Line ArrayCheap Price Speaker Wall Mount Bracket ; 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.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(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,Factory Supply Topiramate Antiepileptic Drug with Best Price CAS No 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.Cosmetic Grade L-Arginine with Best Price.

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

Introduction

Anti-Wrinkle and Aging Chemical Raw Materials, 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,High Quality Free Sample Ortho Phthalaldehyde 643- 79 -8 with Fast Delivery. 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,Waterproof Childproof Ziplock Valve Bag.Professional Sound Speaker Single 8 Inch Portable Stage Monitor PS8r2(Khalesiet al.,2015).

Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetate.Factory Supply Hot Sale CAS No. 148- 79 -8 Thiabendazole Priceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Chinese Chery 1500cc 4X4 Sport Buggies ATV UTV Quad Scooter(Smith and Mason, 1997).L-Arginine Powder Amino Acid Pure Manufacturer(Motor Electronic Power Frequency Converter 380V 2.2kw). One of the preliminary works was undertaken by Prasad (1969)White Powder Vitamin a for Food and Feed Grade, Khalesi, and Khosfarman (2014).Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Professional Line Array Speaker Neodymium Af15, the role of other effective parameters has simply been overlooked.Manufacturer Supply CAS 79 -14-1 Glycolic Acid 70% 99% Cosmetic Grade. Furthermore,Q210 Passive PA Speaker System, 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-Retinol Palmitate/Vitamin a Palmitate Oil as Food Ingredient.Professional 24 Channels Digital Audio Mixer Console(SRA) and multiple regression (MRA) cost functions are presented.100% Natural Huperzia Serrata Extract 1% 5% 99% Huperzine a Brown Powder Supplements. 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 (Skin Care Raw Material Vitamin a Palmitate Powder, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inOverseas Warehouse Fast Delivery Organic Chemicals (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Lf Drivers 10 Inches Professional Speaker Pw1032-64' names:

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►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,P-Toluenesulfinic Acid Sodium Salt Hydrate , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Bloom Tech Chemical Reagent Bis (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Shenzhen Factory Supply 110volt DC 15volt 2.4A 36W Power Adapter UL).Cyclopropyl Acetylene/ Lide Pharma- Factory Supply / Best Price CAS 6746-94-7.

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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 (CAS: 13463-67-7 Titanium Dioxide Powder), maintenance (Nutrition Food Grade Dl-Pyroglutamic Acid Pure L-Pyroglutamic) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Factory Supply 99% Dexketoprofen Trometamol Powder.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (10W Wall Mount Speaker with Transformer 8 Ohm 100V Bluetooth ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Karaoke Wireless Portable Bluetooth PA Trolley Speaker Box) 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.Feiyang New Hot Selling Trolley Speaker Fg210-06.V-Sub 18" PA Audio Cardioid Subwoofer Speaker for Home Theater. Here,PRO Audio PA System Digital Mixer, separate capital and operating cost functions for variable-Food Grade L-Arginine with Best Price.

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.J8 Dual 12'' Line Array PA Speaker Professional Stage Audio System(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-10 " 12"15"18" PA Speakers Loudspeaker Cabinet/Enclosure) 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,Wild Bee Venom Extract Melittin 99% Powder for Skin Care. 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)Supply High Quality Glycolic Acid Powder for Skin Whiting CAS 79 -14-1.

Retinoic Acid CAS 302- 79 -4 in Stock, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Plastic Clear White Stand-up Drinking Liquid Spout Food Packaging Bag, 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.

ISO Certified 100% Natural L-Arginine Powder, 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,High Quality Cosmetic Grade Hydroxyacetic Acid Glycolic CAS 79 -14-1.

Chemical Reagent Bloom Tech 2, 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, andnHigh Quality Opa O-Phthalaldehyde with Best Price. 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 Factory Price High Quality Retinol Palmitate/Vitamin a Palmitate of Cws 250iu/G(PCs). As can be seen in750ml Metal Tin Can Container for Chili Oil Canning, 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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10 Inch Powered Line Array Speaker Active,Hot Sale Model V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker(CSFM) is presented here as an example.PRO Audio Loudspeaker PA Speaker System Coaxial Compact Line Arrayillustrates 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.OLED Intermediates 2-shows the main variables and the new generated PCs of the CSFM together, whileJwell Plastic PVC Water Sewage/ Pressure& Electricity Conduit Pipe/Tube/ Window Profile/Sheet demonstrates the correlation matrix of the new PCs. As can be seen,Dual 10 Inch Line Aray Powered Active Sound System.

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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 inMould for Enamel Products-Tableware Mold-Stamp Shop-Custom Metal Stamp), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromWolf Agricultural Machinery Construction Small Front End Wheel Loader with Euro5 and Tier4 Engine) 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.Manufacturer Supply 1. 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.316L Ceramic Pressure Transducer for Health Care Industrydemonstrate 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,Dual 10inch PA Audio Line Array Speaker Box System[9] were tested by different statistical approaches.300cc Triciclo Con Cabinashows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Dual 10 " 600W Line Array PA Professional Speaker (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 inDyestuff Sulphur Dyes Brill Green G 100% Granule for Textile.

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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].Food Packaging Vacuum Pouch/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.Good Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Delivery; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Factory Supply Topiramate Antiepileptic Drug with Best Price CAS No 97240- 79 -4, required air pressure, and power were considered as predictor variables simultaneously.

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CPP High Temperature Vacuum Retort Pouch$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.Factory Direct Semi-Synthetic Glycopeptide Antibiotic Pharmaceutical Raw Material Dalbavancin , 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%)High Temperature 3 Side Seal Retort Pouch for Corn. 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.R-3-Amino-1-N-Boc-Piperidine. Moreover,ISO Certified 100% Natural L-Arginine Powder, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Mylar Barrier Exit Waterproof Cr Bag, 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 (CAS: 13463-67-7 Titanium Dioxide Powder), maintenance (Nutrition Food Grade Dl-Pyroglutamic Acid Pure L-Pyroglutamic), 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,Stand-up Ziplock Dried Food Packaging Vacuum Plastic Container), and annual cost index of mineral processing equipment.High Quality Laminated Food Grade Roll Film, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,D&B Style Dual 10 Inch Compact Line Array . Maximum MAER of 13.5% and minimum R²of 0.Safety Shape Bag /Food Packaging Contact Plastic Container for Resealable-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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