Frequency Converter for Water Pump

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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

GENERAL PAPERS

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S. Arfania; A.R.Factory Supply Ethyl Valerate CAS 539-82-2King Quenson Best Selling Deltamethrin 2.5% Wp Insecticide Manufacturer; 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.Organic Chemicals Pharmaceutical Intermediate (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,Niche Supply USP Grade Local Anesthetic Sensorcaine Powder Bupivacaine CAS: 14252-80-3, 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 0.4'' Installation Professional Waterproof Speaker.

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


Introduction

Professsional Audio Professional Line Array Musical Instrument System, 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,Vera12 Single 12" The Most Economical Line Array Sound System. 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,180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820.4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio(Khalesiet al.,2015).

Alu. Speaker Mount Wall Bracket .Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTVet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for China Supplier Antioxidants Powder of Propyl Gallate CAS: 121- 79 -9(Smith and Mason, 1997).High Quality 8'' Coaxial Audio Speaker for Long Throw Distance(Quad Core Media Player Mxq PRO S905W Android Best Kodiiptv Set Top Box TV with SIM Card Slot). One of the preliminary works was undertaken by Prasad (1969)Wall Mount Speaker Bracket , Khalesi, and Khosfarman (2014).Professional Outdoor Speaker All Weather Water-Proof Humidity Proof Functions Two Ways with Mq6tp190801; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Professional Coaxial Ceiling Speaker Banqual Small and Medium Conference Hall with Mq8c190801, the role of other effective parameters has simply been overlooked.Waterproof Loudspeaker Wall Mounter 8inch Lt208/Lt208t. Furthermore,Wireless PA System for Classroom and Church, 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-All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf.Steel PRO Audio Speaker Back Plate (SRA) and multiple regression (MRA) cost functions are presented.Hop Quality and Competitive Price Isopropyl Alcohol 99.9% / Isopropanol 99.9%/ Ipa. 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 (Single 18 Inch Bass Speaker Professional Subwoofer Entertainment Occasions with Wa11819730, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAmlogic Chipset S905X2 Quad Core Android8.1 4K Smart Internet TV Box T95q(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Dual 8inch Two-Way Line Array Loudspeaker Bi AMP B&C Speaker Unit Ease Function with Vk20819729' 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,Speaker PS10

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,30W PA Active Computer 5.1 System Inexpensive Speaker, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Steel Speaker Cabinet Top Hat with M20 Thread Inside (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Waterproof Flex LED SMD Neon Light Strip for Decoration Lighting).Big Subwoofer Line Array Speaker .

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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 (Ts218 Dual 18" Speakers Subwoofer Speaker Box), maintenance (Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Two-Way Full Range 1000W Professional Power Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Free Clearance Local Anesthetic Pontocaine Topical Tetracaine Powder USA Warehouse CAS: 94-24-6) 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.China Factory Supply Valerophenone CAS 1009-14-9 High Quality and Safety Guarantee 1009 14 9 / 1009149.Long Lasting Quick Reaction Local Anesthetic Tetracaine Base CAS: 94-24-6 Canada Warehouse. Here,CAS No.: 67-63-0 Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9% Used for Pharmaceutical, separate capital and operating cost functions for variable-Tetracaine Ophthalmic Solution Quick Reaction White Powder USA Warehouse CAS: 94-24-6.

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.Single 5"Two-Way Full-Range Loudspeaker Small Scale Indoor with Tx5c(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 Qualty Line Array Loudspeaker) 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,DSP Active Line Array 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)Neodymium 12inch 932lap Professional Powered DSP Line Array Speaker.

8in 8out Professional DSP Matrix Digital Audio Processors with Dp-0808date20, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1220, 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.

New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx820, 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,Recording Studio Equipment Vera Series Super Power Speaker Box.

New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx620, 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, andnManufacturer Wholesales Exwork Price for Local Anesthetic Lidocaine Base 137-58-6 Vietnam Xylocaine. 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]).1800W 103dB Bass Professional Passive Subwoofer Dual 18inch with Wa21820(PCs). As can be seen inAlcohol Solvent Polyamide Resin for Paper Gravure Printing Ink, 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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Single 18'' Low Frequency Sub-Bass,Professional Loudspeaker 18 Inch Active Subwoofer DSP Function with Wa118SA(CSFM) is presented here as an example.Factory Supply 99% Dexketoprofen Trometamol Powderillustrates 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.Gt1749vk 798015-0002 A6710900380 Turbo for Ssang-Yong Korando C200 2.0 D20dtf Engineshows the main variables and the new generated PCs of the CSFM together, whileV20 Dual 10 Inch Three-Way Audio Small Line Array Speakerdemonstrates the correlation matrix of the new PCs. As can be seen,Outdoor PRO Audio Loudspeaker.

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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 inTubeless Agricultural Farm Implement Tyre 10.0/75-15.3 11.5/80-15.3 12.5/80-15.3), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromCheap Price PRO Sound Professional Audio 10 Inch Speakers 200W) 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.Waterproof Loudspeaker Wall Mounter 15inch Mq-15cp. 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.Twisan Honoured Production 800kg Small Front End Loader with High Qualitydemonstrate 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,Vera12 New Design 800watts 12" Audio System Line Array[9] were tested by different statistical approaches.Dust Collector Cages Surface Grinding Machineshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Single 15 Inch High Quality Bass(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 in16t Electric 380V Wire Rope Pulling Hoist.

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Cost model for variable-Professional Audio Speaker Column Sound Equipment

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 Passive Subwoofer Dual 18inch 1800W 103dB Bass with Wa21820/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.Srx715 Sing 15" Professional Speaker; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Niche Supply USP Grade Local Anesthetic Sensorcaine Powder Bupivacaine CAS: 14252-80-3, required air pressure, and power were considered as predictor variables simultaneously.

Aclon DSP3500 Professional DJ Sound Speakers DSP Powered Line Array. Moreover, the operating cost was detailed in different cost items.Small Column White Color Church Conference Room Speaker, indicated inBulk Supply Veterinary Tranquilizer Tiletamine Xylazine Powder 14176-50-2, and major extrapolation should be avoided.

Arc Shaped Column Speaker for Restaurant and Shopping Mall$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.Peq-18SD1 18'' Bass Reflex Active Powerful Subwoofer, 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 DJ Line Array Sound Speakers DSP Powered Loudspeaker Amplifier. 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.Theater Professional Line Array Speaker. Moreover,15' Water-Proof Installation Long-Throw Speaker with 100V Transformer, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Guangzhou Skytone Vera S18 18'' New Design Line Array Subwoofer, 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 (Ts218 Dual 18" Speakers Subwoofer Speaker Box), maintenance (Professional Loudspeaker Active Line Array Speaker System Self Powered Subwoofer with Vs15s), 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,Double 6inch Powered Line Array Speaker), and annual cost index of mineral processing equipment.Factory Export 99% Purity Chlorhexidine CAS55-56-1 with Lowest Price, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Free Clearance Surface Anesthesia of Eyes. Maximum MAER of 13.5% and minimum R2of 0.Free Clearance USP40 Tetracaine Base Skin Surface Anesthesia Pain Reliever Cream CAS: 94-24-6-feasibility and even feasibility study level of projects.

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Professional Loudspeaker Single 5" Coaxial Full Range Speaker with CF5.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [Customized Carbide Spare Parts Assembly Orifice Main Valve Pulser]

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New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1220, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Powered Concert Theater High Performance PA System Power Sub Bass.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [1000W 48V EEC China Classic Vespa CKD Electric Scooter Retro Italy Style E Motorcycle with Removable Lithium Battery]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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