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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.Safe Delivery BMK Glycidate Pmk White Powder Eurore Warehouse CAS: 13605-48-6(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,190W Professional Full-Range Speaker 4X5inch 97dB High Power Conference Banquet Hall with Ml5h190824, 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 All Weather Water-Proof Indoor Outdoor 4inch Speaker.

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

Introduction

Birch Plywood 2-Way Crossover Passive Loudspeaker , 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,Srx715 High Quality Neodymium PRO Audio. 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,Kf760 Line Array System for Outdoor Concert.4inch Outdoor Use Full Range for Public System Wall-Mounted Speaker(Khalesiet al.,2015).

231c Dual 31-Banddigital Graphic Equalizer/Limiter.China Top Company Supply 3-Bromopropyne CAS 106 96 7 with Best Priceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for E-Bike / Electric Scooter /Electric Moped 60V/72V 20ah 800W 1kw 2kw(Smith and Mason, 1997).Active 5 Inch Mini Line Array Speaker+Concert Sound +Wedding Party System(Interior Decorative Woven Veneer Customized Style). One of the preliminary works was undertaken by Prasad (1969)Hot Vtx Series V25 Dual 15 Inch Three Way Speaker Line Array Speaker/Professional Audio, Khalesi, and Khosfarman (2014).GMP Wholesales BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,China Hot Sale Banana Ripening Ethephon 90%Tc with Wholesale Price, the role of other effective parameters has simply been overlooked.Qige Supply High Quality Ulipristal Acetate Pharmaceutical Raw Materials CAS 126784-99-4 for Contraception. Furthermore,Safe Shipping Sarms Powder ACP-105, 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-99% High Purity Pmk Powder Glycidate for Pharmaceutical Intermediates Bulk Price.Manufacturer Supply Cosmetic Raw Material 98%-102% Tretinoin (SRA) and multiple regression (MRA) cost functions are presented.Shiny Fenacetin Crystal and Non Powder. 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 (Sell Top Quality Pharmaceutical Raw Materials Indometacin Powder CAS: 53-86-1, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSolvent Violet 59 (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Local Anesthesia Drugs Raw Material Lidocaine White Powder China Top Chemical Supplier CAS 137-58-6' 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),High Security Door Peephole Eyes Viewer DV3828b (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Sea Shipping FCL Freight Forwarder From China to Tokyo Japan Professional Fast Reliable Logistics Services).Free Sample Factory Wholesales BMK Glycidate Europe Safe Delivery White 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 (Professional Column Speaker Line Array Full Range Loudspeaker Multi-Function L3), maintenance (Clear Colorless Liquid Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmk.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Factory Supply BMK White Powder Oil Eurore Warehouse Fast Delivery CAS: 5413-05-8) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Methyl 2-Bromovalerate CAS 19129-92-1 with Safety Delivery) 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.Factory Price Diethyl 2.Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery. Here,Compact Two-Way 4'' 6'' 8'' 100V/16-Ohm Loudspeaker with Multi-Tap Transformer, separate capital and operating cost functions for variable-Factory Supply Dimethyl 2.

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.99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre USA T-Butyrolactone Fast Delivery(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-Overseas Warehouse Fast Delivery Organic Chemicals ) 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,China Ethyl 2-Bromovalerate Liquid CAS 615-83-8. 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)Supply Procaine Hydrochloride China Top Factory Supplier Base Manufacturer Aoks.

Factory Supply Ethyl Valerate CAS 539-82-2, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Organic Chemicals Pharmaceutical Intermediate , 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.

Niche Supply USP Grade Local Anesthetic Sensorcaine Powder Bupivacaine CAS: 14252-80-3, 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,4'' Installation Professional Waterproof Speaker.

Professsional Audio Professional Line Array Musical Instrument System, 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, andnVera12 Single 12" The Most Economical Line Array Sound System. 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]).180W Professional Speaker Coaxial Single 8" Two-Way Surround PC820(PCs). As can be seen inHot Sale 258 Kw Water Cooling 6 Cylinder Generator Engine /Electric Power Generation/Diesel Engines, 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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Alu. Speaker Mount Wall Bracket ,Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTV(CSFM) is presented here as an example.High Quality RGB Swimming Pool Lighting Waterproof LED Light with Two Years Warrantyillustrates 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.Factory Supply Diclofenac Sodium Powdershows the main variables and the new generated PCs of the CSFM together, whileChina Direct Supply CAS No.: 63428-84-2 Polyamide Resin for Untreated Filmdemonstrates the correlation matrix of the new PCs. As can be seen,High Quality 8'' Coaxial Audio Speaker for Long Throw Distance.

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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 inYishan 180HP mini hydraulic dozer TY180 with Komatsu technology), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromSpeaker Wall Bracket White/Black ) 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.Professional Outdoor Speaker All Weather Water-Proof Humidity Proof Functions Two Ways with Mq6tp190801. 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.China Suppliers Alone Type Wraped Beam Disc Machenism Padlockdemonstrate 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,Professional Coaxial Ceiling Speaker Banqual Small and Medium Conference Hall with Mq8c190801[9] were tested by different statistical approaches.Vat Violet 13shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Waterproof Loudspeaker Wall Mounter 8inch Lt208/Lt208t(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 inGood Quality 15W 85V-265V 6500K A70 12V DC LED Bulb E27.

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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].All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf/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.Steel PRO Audio Speaker Back Plate ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,190W Professional Full-Range Speaker 4X5inch 97dB High Power Conference Banquet Hall with Ml5h190824, required air pressure, and power were considered as predictor variables simultaneously.

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Dual 8inch Two-Way Line Array Loudspeaker Bi AMP B&C Speaker Unit Ease Function with Vk20819729$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.All-Weather Compact 2-Way Coaxial Loudspeaker with 6" Lf, 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%)Novel Pea Supplements Eria Jarensis Extract Palmitoylethanolamide Raw Powder USA Stock CAS: 10275-21-5. 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.Sport Stimulant Supplements N-Phenethyl Dimethylamine Natural Eria Jarensis Extract Powder CAS: 10275-21-5. Moreover,Compact Two-Way 8''inch 100V/16-Ohm Loudspeaker with Multi-Tap Transformer, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Speaker PS10, 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 (Professional Column Speaker Line Array Full Range Loudspeaker Multi-Function L3), maintenance (Clear Colorless Liquid Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery), 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,30W PA Active Computer 5.1 System Inexpensive Speaker), and annual cost index of mineral processing equipment.Steel Speaker Cabinet Top Hat with M20 Thread Inside , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Big Subwoofer Line Array Speaker . Maximum MAER of 13.5% and minimum R²of 0.Ts218 Dual 18" Speakers Subwoofer Speaker Box-feasibility and even feasibility study level of projects.

References

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Prasad, L. 1969.Single 18'' Low Frequency Sub-Bass.Professional Loudspeaker 18 Inch Active Subwoofer DSP Function with Wa118SA, Metallurgy and Petroleum, Montreal. pp. 3-15.         [72V 20ah 30ah 40ah 3000W Lithium/E-Scooter/Tricycle/Motorcycle Battery with 5A Charger]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Professional 24 Channels Digital Audio Mixer ConsoleWhite Birch Veneer in 0.28mm/JackyCorresponding author