Vera 12 Loudspeaker Line Array Speaker System

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Fiber Laser Cutting Machine for Metal Cutting-1500W

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

28dBi Gain 0.6m 5GHz Parabolic Antenna Best Design for SaleCost modelling for flotation machines

S. Arfania; A.R.Speaker System High Power H32876 10kw Home Used Solar Power System on Grid Roof; 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.CAS No.: 67-63-0 Colorless Transparent Liquid Isopropyl Alcohol 99.9% Used as Raw Materals in Pharmaceutical(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,Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4, 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 0.500W Powered Speaker Professional Sound Line Array System .

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


Introduction

Proxima Entertainment Z-450 Digtal 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,Professional Stage Bass Sound System 15 Inch Subwoofer Speaker Ls500. 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,Lat210A Srx700 Series PA Sound System Professional Speakers.Professional Public Address Mini Onwall Line Array Speaker (Khalesiet al.,2015).

Q1--Dual10 Inch Line Array Speaker.12inches PA Speaker Audio Componentet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Motorbicycle with Stable Wheels(Smith and Mason, 1997).Peq-8A-Active PA Speaker with Class-Ab Mono Amplifier Portable Bluetooth(Free Sample Veterinary Drugs Xylazine Hydrochloride Powder CAS: 23076-35-9 USA Warehouse). One of the preliminary works was undertaken by Prasad (1969)Portable Black Floor Tripod Speaker Stand Adjustable for 12 Inch PA, Khalesi, and Khosfarman (2014).Power Amplifiers PA Speaker System Amplifier 1000 Watt; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Wholesales Organic Intermediate 1, the role of other effective parameters has simply been overlooked.Audio J812 Loudsspeaker Line Array PA System Speaker Plan Three Way Dual 12 Inches PRO Sell. Furthermore,Live/Installed Sound System PRO Speaker Box , 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-Outdoor Double 6" Full Range Speakers 12" Active Subwoofer Professional Audiomini Live Bands System for Musician PA.Professional Speaker with Laser Light (SRA) and multiple regression (MRA) cost functions are presented.XL-GF15 15-Inch 400W-800W Two-Way Two-Unit Full Frequency Professional Stage Equipment Speaker. 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 (Professional Multifunction Active Stage Speaker Wood Bt with Laser Lights, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inRGB Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency 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,Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,18" Fane Style Aluminum Speaker Frame, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),18" Die Cast P-Auido Style Aluminum Frame(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Men's Fleece Hoodies Print Contrast Fabric Pullover Sweatshirt for Winter).Professional Stage Active Line Array Speaker with DSP.

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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 (Single 18" Subwoofer Speaker Box), maintenance (Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,12" Professional Rcf Style Speaker Frame.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Horn Professional Speaker H3) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Coaxial Loudspeaker TD12) 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.18'' Subwoofer Speaker Box Ls1200.Dual 12" Subwoofer Speaker Box. Here,DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional, separate capital and operating cost functions for variable-Fast Delivery 1.

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.Professional Speaker Box F12+(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-Df B&C Trees Speaker Subwoofer Audio Professional) 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,15'' Coaxial 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)Customs Guaranteed 1.

China Factory Supply Ethylmagnesium Bromide CAS 925-90-6, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Ltk One 12" Woofers and 3" Driver Compact Coaxial Line Array Speaker, 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.

Manufacturer Supply Bdo Novel Intermediate 1, 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,Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro.

99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6, 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, andnChina Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole. 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]).400 Watt Portable Music Player Speaker Professional Audio(PCs). As can be seen inJarol Frequency Inverter JAC200 3 Phase 380V 4kw, 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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Dm 15 Inch PA Full Sound Systems Professional PRO Speaker,12inch KTV Bar PA Full Sound Speaker System Audio(CSFM) is presented here as an example.L18 Tws Bluetooth V5.0 Stereo Music Earbuds Headsetillustrates 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.Custom Printing Food Packaging Plastic Bags with Resealable Zippershows the main variables and the new generated PCs of the CSFM together, whileAftermarket Hdy. Cyl Repair Kits for Cat Diggers/0965606demonstrates the correlation matrix of the new PCs. As can be seen,Dare Dual 8" Neodymium Active Line Array Set PA 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 inLarge Capacity Durable Oxford Custom Logo Thermal Aluminum Foil Tote Handle Cooler Bags Food Delivery Bag), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromElectric Motorcycle ) 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.PA Speaker Dual 18" Subwoofer System. 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.E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 18.00-25demonstrate 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,PA Speaker with Line Array Tweeter Horn [9] were tested by different statistical approaches.Diesel Engine Parts Fuel Injection Nozzle Dlla153p049shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Active Mini Line Array Speaker with DSP Amplifier Module(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 inCustomized 2HD Cameras Autodata Database 3D Wheel Aligner for Auto Shop.

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Cost model for variable-Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder

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].High Quality Karaoke Loudspeaker with B&C Compression Driver/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.99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Ep Grade Antihistamine Cyproheptadine for Dogs Factory Wholesales CAS: 41354-29-4, required air pressure, and power were considered as predictor variables simultaneously.

Factory Supply BMK Powder Glycidate CAS: 5413-05-8. Moreover, the operating cost was detailed in different cost items.China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone, indicated inSt 5kw Single Phase AC Electric Alternator Generator, and major extrapolation should be avoided.

Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder$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 0.99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8, 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 Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price. 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.Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5. Moreover,99% BMK White Powder Glycidate Bulk Sales CAS: 16648-44-5, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (99% 4'-Hydroxyacetophenone CAS 99-93-4 100% Pass Customs, 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 (Single 18" Subwoofer Speaker Box), maintenance (Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse), 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,62442 Shiny and Non Phena Powder 62 44 2), and annual cost index of mineral processing equipment.Quality Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Hair Loss Treatment Acetyl Tetrapeptide-3/Capixyl CAS 827306-88-7 Purity Min 99% Powder. Maximum MAER of 13.5% and minimum R2of 0.100% Passing The Customs Europe Free Shipping BMK Glycidate 16648-44-5-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Tg01 1 Inch Silk Dome TweeterL18 /86138-Good Feedback! Professional 18 Inch PA Speaker 1500W RMS Neodymium SubwooferCorresponding author

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