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Closed Type of Fiber Laser Cutting Machine for Metal Working-Ipg-1000W

On-line version ISSN2411-9717
Print version ISSN2225-6253

J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017

http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

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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.Chinese Factory for Vitamin a Palmitate 0.25miu Powder(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,Chinese Top Local Anesthetic Exporter Bulk Sales Procaine CAS: 51-05-8, 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.Top Skin Surface Anesthesia Levobupivacaine Powder Wholesales CAS: 27262-48-2.

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


Introduction

High Quality and Purity Raw Material Supplier Xylazine HCl CAS 23076-35-9 with Best Price, 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,Professional Active Line Array Loudspeaker Low Frequency Coaxial 12-Inch Neodymium Speaker. 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,Q1+Q Sub Sound & Light Installation High Performance in Concert Event.Professional PRO Audio DJ Mixer DSP Powered Full Range Line Array Speaker(Khalesiet al.,2015).

Powerful PRO Audio 2 Way Full Range DSP Powered Line Array Speaker.Dual 18 Subwoofer Speaker with 12 Inch Audio Professional Kas Line Arrayet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 1-Bromo-3(Smith and Mason, 1997).Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer(Motorcycle Ignition Coil/Bobina Encendido/Bobina Alta/Moto Accesorios/Piezas Gy6). One of the preliminary works was undertaken by Prasad (1969)Kas 12 Inch Line Array Audio Professional DJ Speakers 18 Subwoofer, Khalesi, and Khosfarman (2014).Qg-12-12 Inch Professional Full Range PRO Audio Speaker Box; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Kas 12" B&C Loud Subwoofer Speaker Line Array Professional Audio for Outdoor Event, the role of other effective parameters has simply been overlooked.High Power Two-Way Full Range PRO Audio Speaker Box System. Furthermore,Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer, 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-30W Dante Wall Speaker with External 24V DC Power Supply Dp 430.Kas 12 3 Way Sound System Line Array PRO Speakers with Subwoofer(SRA) and multiple regression (MRA) cost functions are presented.Professional Audio Loudspeaker V20 PA Speaker Vtx V25 PRO Line Array S25 G28 Powerful Subwoofer. 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 (Rental Application Stage Monitor Audio&Sets, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFactory Manufacture E307D Bucket Cyl Kit Seal(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Local Anesthetic Levobupivacaine Powder Brazil Free Sample 27262-48-2' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Rimonabant Powder Weight Loss Factory Direct Supply(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Jb-C Series Semi-Automatic Impact Tester Metallurgy with Fully Enclosed Protective).Top Local Anesthetic Supplier Marcaine Injection 14252-80-3 Bupivacaine Powder.

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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 (High Quality Procainamide Hydrochloride 614-39-1), maintenance (Pharmaceutical Grade Anesthetic Powder Bupivacaine Brazil Warehouse CAS: 14252-80-3) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PA Horn Loaded Speaker Professional Loudspeaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Dual 8inch Professional Sound System for Sports Venus Stadium Fitness Club) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Professional Audio Powerful High Compact Line Array Speaker Best Lq10) 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.GMP Factory Supply Procaine Powder CAS: 51-05-8 Novocaine Free Shipping.Top Quality Benzocaine / HCl CAS 23239-88-5. Here,Big Discount 99% Glycocyamine Supply Guanidineacetic Acid 352-97-6, separate capital and operating cost functions for variable-Guaranteed 99% Sarms Steroids Supplements Mk-677 UK Shipping Free.

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.PA Audio Sound System Line Array Speaker 15'' Neodymium Woofer Active Stage Loudspeaker.(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-Mixer Power Amplifier with USB) 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,Powered Line Array Active Stage Speaker. 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)PRO Audio Loudspeaker PA Speaker System Coaxial Compact Line Array.

PRO Audio Loudspeaker PA Speaker System 12&Rdquor & 15&Rdquor Line Array, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PA Speaker System SA-212 Professional 12 Inch Karaoke Stage Wood, Khalesi, and Khosfarman, 2014).

whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables 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.

Karaoke Speaker System Chinese KTV High Output Compact Box, 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]:

whereXobsis the observed value,xethe estimated value at time/placeI,and n,Coaxial Speaker TD10.

Professional Sound System Effects for Equipment Hire , 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).

whereCeis the estimated cost,Cathe actual cost, andnPA System 30W Waterproof Plastic Driver Unit for Horn Speaker with Stainless Steel Screw Outdoor Use. 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]).Outdoor Show Audio Lt12 Passive Line Array Speaker System(PCs). As can be seen in2021 Big Promotion Product Adult 1200W Electric Bike Motorcycle Without Pedals, 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 andXias Equations [5] and [6]:

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In this research, main variables ofX1, X2... Xnwere 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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Outdoor Speaker Professional Audio Factory,Active Speaker with LED Display 15"500W Full Range Bluetooth H-15p(CSFM) is presented here as an example.Water Pump Variable Frequency Drive Vector VFD Inverter Elevator Motor Priceillustrates 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.PP Corrugated Roofing Sheet Extrusion Machineshows the main variables and the new generated PCs of the CSFM together, whileChina Hot Sale Banana Ripening Ethephon 90%Tc with Wholesale Pricedemonstrates the correlation matrix of the new PCs. As can be seen,Safe Delivery CAS 49851-31-2 / 2-Bromovalerophenone Yellow Liquid and 1009-14-9.

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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)

whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inAutomatic 3D Furniture Sculpture Wood Carving CNC Router Machine), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from0.15mm Okoume Wood Face Veneer Rotary Cutting for Sell) 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 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7. 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.2021 Hot Selling Cheapelectric Mini Dirt Bike Lithium Battery Powered 500/ 800W Fat Mountain Electricdemonstrate 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,Raw Material Benzocaine Powder CAS 94-09-7 Pain Killer Factory[9] were tested by different statistical approaches.PA12 Injection / Extrusion Molding Polyamide 12 Nylon Granulesshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.80%-90% Lactic Acid CAS 598-82-3 L-Lactic(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 in350kVA/280kw Power Generator Set Diesel Engine Genset for Hospital.

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Cost model for variable-PRO Audio PA Speaker

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].Top Quality Tretinoin Powder  Retinoic Acid for Skin Care/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.TCP/IP Network Poe 15W Active Wall Mount Speaker Waterproof; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Chinese Top Local Anesthetic Exporter Bulk Sales Procaine CAS: 51-05-8, required air pressure, and power were considered as predictor variables simultaneously.

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Brazilian Spanish Market 99%Pure Lidocaine HCl Drugs USP36$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.Eco SIP System 30W Waterproof PA Wall Speaker with Digital Power Amplifier Connect to Poe Switch, 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%)Hot Selling High Quality CAS. 56-95-1 Chlorhexidine Acetate. 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.Public Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker. Moreover,Passive Single 12'' Line Array Loudspeaker Sound System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (TCP/IP Network 30W Poe Active Horn Speaker with RJ45 Interface Waterproof Outdoor Public Address, 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 (High Quality Procainamide Hydrochloride 614-39-1), maintenance (Pharmaceutical Grade Anesthetic Powder Bupivacaine Brazil Warehouse CAS: 14252-80-3), 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,TCP/IP Network 15W Poe Active Horn Speaker Waterproof Outdoor Use), and annual cost index of mineral processing equipment.99% Proparacaine Hydrochloride / HCl CAS 5875-06-9, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Professional Speaker PRO Audio System Compact Line Array PA Lq10. Maximum MAER of 13.5% and minimum R2of 0.Weight Loss Raw Powder Rimonabant with Good Effects 168273-06-1-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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