Pneumatic Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coding

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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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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.Benzocaine CAS 94-09-7 Tetracaine HCl Lidocaine Sell 136-47-0(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,Melamine Molding Powder for Making Tableware Dishware China, 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.Professional Self-Powered Active Bass Speaker Subwoofer Single 18inch PA Audio System 800W Vs18s20.

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


Introduction

8X4" Active Column PA Speaker, 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,Chinese Lidocaine Hydrochloride CAS 73-78-9 HCl. 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,Professional Speaker with Hanging Hardware Parts Horizontal .PA Power DJ Audio Speaker(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (PA Speaker Parts of T24 12 Inch , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inExternal Rubber Antenna for Huawei Modem B315 B593 Mf283 4G Lte with SMA Male Router(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;PA Speaker with Horn Parts 210L*62W*105h 1"X2 ' 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,Single 15 Inch PA Full Sound Systems Professional PRO Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Cheap Price PA Speaker of Line Array Rigging 8 Inch (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wholesale Custom Personalized Religious Catholic Kids Replica Champions League Sport Engraved Martial Hard Enamel Christmas Medal for Souvenir Gifts).Professional Self-Powered Subwoofer DSP Function Indoor Outdoor PA System Bass Speaker with Vk10SA19729.

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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 (PA Speaker Horn for Stage 180L*180W*106h 1" ), maintenance (6inch Bar PA Full Sound Speaker System Audio Muslims) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,China Exwork Price Emla Cream Raw Materials Lidocaine Prilocaine Local Anesthetic Powder CAS: 1786-81-8.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (99% Amide Type Lidocaine Prilocaine Cream USP 2.5% Local Anesthetic Raw Powder CAS: 1786-81-8) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Aluminium Back Plate for PA Speaker ) 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.Full Range Portable Multi-Fuction Speaker Box .Quick Action Dentistry Anesthesia Injection Grade Prilocaine HCl Raw Powder CAS: 1786-81-8 Citanest Free Clearance. Here,Lidocaine Hydrochloride CAS 73-78-9 HCl, separate capital and operating cost functions for variable-PA Speaker Parts .

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.Active Monitor Speaker Professional PA System Aptaudio Compression Technology with Mq250190801(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-Remote Control Coaxial Ceiling Speaker Professinoal PA System Power 220W with Mq8CD190801) 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,Line Array PA Speaker System Stage 12inch Monitor 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)Wholesale Price Professional PA PRO Audio Sound System Loudspeaker.

Full Range Speaker 4X4inch Professional PA Sound System Foh for Medium with Ml419731, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Music PA Speaker Double 12 Inch Full Range, 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.

PA Column Speaker Empty Alu. Cabinet 4.5" , 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,PRO Audio Speaker 12 Inch Sub PA Passive Speakers.

PA Speaker Steel Back Plate , 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, andnProfessional Speaker Power Line-Array Actives Stage Loudspeaker PA System with Vs12. 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]).Line Array with Aluminum Rigging Parts for PA Speaker (PCs). As can be seen inScarlet/ Violet / Purple/ Golden/Green Color Paste, 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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20dB Gain DJ Mixing Console with MP3 Input ,PA System LED Light Trolley Tws Woofer Speaker Party Audio(CSFM) is presented here as an example.Urea Fertilizer/ Ammonium Sulfate with Steel Gradeillustrates 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.Industrial Mining All Welded Anti Explosion Pressure Transmittershows the main variables and the new generated PCs of the CSFM together, while900watt Amplifier Moudel Borad Chinese Class -Ddemonstrates the correlation matrix of the new PCs. As can be seen,Dual 12 Inch Fiver Drivers Passive/Active Line Array PRO Audio 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)

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 inOphthalmic Fkr-710 Auto Refractometer Keratometer 9" Colorful Touch Screen), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromPS10 High Power 10 Inch Monitor PA Speaker for Live Performance) 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.High Quality Professional OEM / ODM Manufacturer PA Systems 8" Speakers. 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.Outdoor Dual 10 " Three Way Line Array Professional Audio Speaker Systemdemonstrate 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,K2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets [9] were tested by different statistical approaches.5f-Pcn CAS No. 1445579- 79 -2 in Stockshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.12 Inch Karaoke Bar KTV Speaker Professional PA Passive Stage(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 inStrip Light with 120 LEDs 24V Color Blue.

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Cost model for variable-Proxima Entertainment S-320 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].Karaoke Voice Reduction Professional Audio Converter Proaudio /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.Sp215 Sound Prince Style Speaker Acoustic; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Melamine Molding Powder for Making Tableware Dishware China, required air pressure, and power were considered as predictor variables simultaneously.

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Best Sale Bulk Price1$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.Passive Full Range 2-Way Speaker Line Array for Outdoor, 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%)Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse. 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.High Power Horn Speaker H3. Moreover,Horn Speaker L-Acoustics Kudo Line Array+ PA System Array Box, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Levamisole Hydrochloride CAS 16595-80-5 in Stock, 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 (PA Speaker Horn for Stage 180L*180W*106h 1" ), maintenance (6inch Bar PA Full Sound Speaker System Audio Muslims), 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,Fast Shipping to Australia Quality 1.4 Butanediol Bdo 110-63-4), and annual cost index of mineral processing equipment.Wireless Professional Rechargeable Portable DJ Karaoke Sound Box Trolley Bluetooth PA Speaker with ED-606, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,2.4GHz Wireless Ceiling Speaker PA System. Maximum MAER of 13.5% and minimum R2of 0.OEM ODM Public DJ PA Wooden Speaker-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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