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Ophthalmic Equipment Biometer Scan aCost 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.Lf Driver 10 Inches 63.5mm Kapton Coil Professional Speaker (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,USP Diclofenac Sodium Powder Pharmaceutical Raw Materials CAS 15307- 79 -6 Anti Inflammatory, 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.Click 2021 Hot CAS 85-27-8 Symwhite Phenylethyl Resorcinol Made in China.

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

Introduction

Cosmetic Raw High Purity CAS 79 -81-2 Vitamin a Palmitate Powder, 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,10'' Inch Ferrite Woofer. 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 Oxytetracycline CAS 79 -57-2 with a Exposure Rate and The Latest Date of Production.10'' Ferrite Woofer(Khalesiet al.,2015).

Professional Stage Line Array System Dual 10 Inch DSP Active Speaker .D&B Style Dual 10 " Professional Speaker Line Array et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Hotel Bedroom Furniture/Hotel Furniture/Apartment Living Room Sofa/Hospitality Sofa/Hotel Sofa/Modern Sofa for 5 Star (Smith and Mason, 1997).UV Protection Agent 2-Phenylbenzimidazole CAS 716- 79 -0 Mesh Number Can Be Customized Exogenous Biological Compounds(Active 5 Inch Mini Line Array Speaker+Concert Sound +Wedding Party System). One of the preliminary works was undertaken by Prasad (1969)Line Array 10 Inchneodymiun PRO Audio Woofer, Khalesi, and Khosfarman (2014).Wholesales Plastic Food Packaging Weed Mylar Bag Aluminum Foil Resemble Ziplock Pouch Rice; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Mylar Custom Printing Barrier Exit Bag, the role of other effective parameters has simply been overlooked.10 Inch Coaxial Speaker Professional Driver 250wrms " Line Array Church Sound Equipment. Furthermore,10 Inch Coaxial Speaker Professional Driver 250wrms Line Array, 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-Professional Dual 10 " 3-Way Tri-AMP Line Array Speaker.Manufacturer Supply 1(SRA) and multiple regression (MRA) cost functions are presented.Dual 10inch Powerful Line Array Speaker Ds210 Professional. 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 (Feiyang/Temeisheng 10 Inch Professional DJ Wooden Speaker Audio Gd10-02, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inN(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Neodymium Double 10 Inch DSP Active Professional Powered Line Array Speaker' 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,Pharmaceutical Intermediate 1

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,2-Phenylbenzimidazole|716- 79 -0 99% High Purity, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Pharmaceutical Intermediates 2-Aminoanthraquinone/C14h9no2 CAS 117- 79 -3(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Antibacterial Hand Sanitizers 75% Alcohol).High Quality 1.

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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 (China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3), maintenance (New Products Factory Price Supply CAS 71277- 79 -7 Disodium Glycyrrhizate in Hot Sale) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Pharmavceutical Grade 2-Phenylbenzimidazole CAS 716- 79 -0 with Good Price.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Quality Custom Stand up Pouch/Plastic Food Packaging Bag with Zipper) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Sell Well Opa) 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.Best Price O-Phthalaldehyde.Good Quality Powder CAS 56377- 79 -8 Nosiheptide with Best Price. Here,Guarantee Lowest Price 2-Phenylbenzimidazole CAS 716- 79 -0 in Hot Selling Fungicide, separate capital and operating cost functions for variable-Qsn Professional Audio Dual 10 "Power Speaker Xt10.

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.Hot Selling Powder Thiabendazole CAS 148- 79 -8(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-High Quality Coffee /Candy/Weed Plastic Container) 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,Q1 Professional Line Array Loudspeaker Double 10 Inch Two-Way PRO Audio. 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)Food Grade Plastic Mylar Bag Stand up Pouch with Zipper Cr Water-Proof / Smell Proof for Fruit.

Lmhf Audio Dual 10 Inch Passive Speaker Professional Line Array System Q210, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (10 Inch 2 Ways Self-Powered Active Column Speaker Box Line Array System, 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.

Two-Way Passive Line Array , 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 Efficiency Dual 10inch Line Array System Q1+Q Sub for Professional Audio Speaker.

Custom Printed Food Grade Aluminum Foil Plastic Packaging Weed Mylar Bag for Fine Powder Snacks, 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, andnFoil Liquid Packaging Stand up Spout Pouch Food Bag. 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]).Smell Proof Waterproof Weed Bag Plastic Food Packaging Child Resistant(PCs). As can be seen inAC Drive Solar Pump Inverter 220V 380V Three Phase Inverters, 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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Mylar Child Resistant Waterproof Plastic Bag with Zipper,Plastic Pouch Custom Water Proof Weed Packaging Food Pack Stand up Bag(CSFM) is presented here as an example.Professional Line Array System Dual 10 Inch 3 Way Passiveillustrates 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.Powder Compound Fertilizer Ammonium Sulphate with Nitrogen 21%shows the main variables and the new generated PCs of the CSFM together, whileClosed Motorized China Cargo Tricycle with Box demonstrates the correlation matrix of the new PCs. As can be seen,Mylar Custom Printed Plastic Weed Bag Stand up Pouch with Zipper.

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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 inIATF 16949 Certifications Vulcanized Rubber Flaming Parts for Car), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromLDPE Plastic Pellet 30% Black Pigment Color Masterbatch) 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.Mylar Composite Aluminum Foil Laminated Custom Logo Bag with Ziplock. 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.Professional All Weather Water-Proof Outdoor Speaker Humidity Proof Two Ways Mq6tp190801demonstrate 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,Custom Aluminum Foil Laminated Bag with Zipper[9] were tested by different statistical approaches.Small Cheap Quadrant Simple Fiberglass Hinge Shower Enclosure shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Purity O-Phthalaldehyde(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 in2021 New Product Door Closer Aluminum High Quality Fire-Proof HD-165.

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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].Quality Assurance O-Phthalaldehyde/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 Power Speaker Dual 10 " PRO/Professional Audio Line Array ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,USP Diclofenac Sodium Powder Pharmaceutical Raw Materials CAS 15307- 79 -6 Anti Inflammatory, required air pressure, and power were considered as predictor variables simultaneously.

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Vitamin a Acid/ Tretinoin CAS: 302- 79 -4 for Skin Disease$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.Hrk Provide Topiramate Powder Price CAS 97240- 79 -4, 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%)Speaker 2way Double 10inch Full Range High Power Neodymium Speakers Line Array . 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.China 10 " DJ Indoor/Outdoor Audio Sound System Line Array Speakers . Moreover,Dual 10 " Professional Home Sound Mini Concert Karaoke Party System Mobile Trolley Battery Active Stereo Audio Speaker with DJ Light+Remote Control+Bt, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (China Hot Sale Professional Speaker Dual 10 Inch Line Array, 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 (China Best Price Sell 99% USP Grade Chemicals Supplements L-Arginine Raw Powder CAS: 74- 79 -3), maintenance (New Products Factory Price Supply CAS 71277- 79 -7 Disodium Glycyrrhizate in Hot Sale), 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,10 " Plywood Professional DSP Active Speaker ), and annual cost index of mineral processing equipment.Top Quality CAS 643- 79 -8 O-Phthalaldehyde, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,High Quality Chemical Product 4- . Maximum MAER of 13.5% and minimum R²of 0.Bluetooth Speaker Indoor Outdoor Party Sound 10 Inch Active Arrray System-feasibility and even feasibility study level of projects.

References

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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