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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.Voomaster Brand Big Diamonds Tread Pattern Motorcycle Tyre 3.00- 17 (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,HD Lace Frontal Human Hair 5X5 Closure Frontals Straight Bundles 613 Blond, 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.Ophthalmic Pachymeter .

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

Introduction

6A Grade Indian Beard, 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,Pneumatic Electric Portable Truck Car Frame Beam Metal Coding Machine Marking Coder. 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,50W LED Bulb Marking.50W Fiber Laser Marking Machine for PVC/ Plastic/ Stainless Steel/ Silicon(Khalesiet al.,2015).

Flexible Label Laser Marking Machine for Airbag Warning Labels.WiFi Wireless Ultrasound Linear Color Doppler USB 192 Elements Probeet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Kas 12" B&C Loud Subwoofer Speaker Line Array Professional Audio for Outdoor Event(Smith and Mason, 1997).Factory Customized Automobile Automotive Vehicle Parts Electric Drive and Motor Shaft(Electronic Component Using Anti-Static ESD Metal-in Shielding Bag Aluminum Foil Zip Lock Packaging Bags). One of the preliminary works was undertaken by Prasad (1969)Original Quality Motorcycle Parts Spark Plug Cap for Gy6 125, Khalesi, and Khosfarman (2014).30W Bird Rings Machine Laser Marker with Rotation Working Table; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Mini Handle Electric DOT Peen Marking Machine, the role of other effective parameters has simply been overlooked.Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40. Furthermore,Pin Machine Suppliers Marker Systems, 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-USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows Device.1L Rectangular Olive Oil Tin 1800ml Packaging with Imported Plastic Spout Guangdong(SRA) and multiple regression (MRA) cost functions are presented.1L Metal Resealable Selable Paint Tin Cans for Glue and Chemical Use. 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 (4u 16 in 1 Agile CATV RF Modulator Channels, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inEngine 150cc China 3 Wheel Motor Tricycle Chinese Commercial(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Thinner Plain Color 1L Metal Can with Screw Cap' 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,Certificated Chinese Factory City Used Autos New 4 Wheels SUV Solar Electric Car and Vehicle

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Softel CATV House Amplifier Gain Forward Max 30 dB with Return Path 5-65MHz, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Gain 30dB 1 Output CATV House User Amplifier with AGC(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Hot Sale Portable Optical Fiber Fusion Splicer for Optic End).Softel 24 Channel Optional RF Fixed Analog Modulator.

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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 (Cummins diesel engine 4918416 inline 5 diagnostic tool datalink adapter), maintenance (Solar Energy System 3kwh Power Home Built in Inverter) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Quality 3kwh Rechargeable LiFePO4 Lithium Battery.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Automatic Thermostatic Vulcanizer for Sale ) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (BMW N63 S63 Camshaft Alignment Tool Set ) 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.Gy6 -125 Spark Plug Cap OEM Quality Motorcycle Parts.2021 High Quality Marine 1400W Hybrid Power Inverter Solar System Portable with 3kwh Lithium Battery. Here,Motorcycle Scooter Rear Clutch Assembly for Gy6 -90 Engines, separate capital and operating cost functions for variable-Motorcycle Parts Speed Cable for Gy6 -150.

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.Powder Metallurgy Hot Press Sintering Furnace(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-Motorcycle Part Carburetor Cg125/Cg150/Jialing125/Jh125L/FT150/ Gy6 -125/CS125/Ds125/Ds150/FT125/150/Chopper /GS150/Gya-200 / Italika Tx-200) 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,Cheap Popular Pattern 3.00-18 Motorcycle Tyre. 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)Strong Corrosion Resistance High Overload Pressure Sensor.

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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.

High accuracy stability Monocrystalline Silicon Pressure Transmitter, 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,Discount High Strength 90/90-19 Motorcycle Tyre/Tire.

New Pattern Best Price 110/90- 17 Motorcycle Tire, 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, andnTire Brands to Avoid 2.50- 17 Solid Tire.. 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]).2021 Hot Sale 18W 12V High Power Swimming Pool Lighting Water Proof Lights for(PCs). As can be seen in1L Stainless Steel 304 Bottle with Clamp and Silicone Gasket, 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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2021 Hot Sale Surface Mounted Swimming Pool Underwater LED Light with Edison Chip,Chinese 300cc Cheap Farm Gas Trike (CSFM) is presented here as an example.AC Drive Frequency Variable General Power Supply Solar Motor Pumpillustrates 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.Single 18'' Low Frequency Sub-Bassshows the main variables and the new generated PCs of the CSFM together, while10 Inch Coaxial Speaker Professional Driver 250wrms Line Arraydemonstrates the correlation matrix of the new PCs. As can be seen,3.00- 17 Super High Quality Natural Rubber Motorcycle Tire..

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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 in1000L Stainless Steel Milk Chilling Vat), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromAdult Electric Motorcycle/Scooter 60V20ah Lithium Battery China) 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 Surface Mounted Swimming Pool Underwater LED Light with Edison Chip. 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.Professional Sound System Effects for Equipment Hire demonstrate 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,Ophthalmic Ultrasonic Pachymeter and Biometer[9] were tested by different statistical approaches.250ml Round Linseed Perilla Seed Oil Tin Can with 28mm Flip Top Capshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.2D Echo Color Doppler Ultrasound Scanner Diagnostic Equipment(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 inKeeping Aroma High Barrier Ground Coffee Bag.

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Cost model for variable-2021 New Arrival Malaysian Eyebrow

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].18" Remy Hair Lace Front Closure Natural Color Body Wave/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.250ml 500ml 750ml 1L Fancy Small Cooking Oil Tin; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,HD Lace Frontal Human Hair 5X5 Closure Frontals Straight Bundles 613 Blond, required air pressure, and power were considered as predictor variables simultaneously.

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8-30inches Malaysian Straight Hair Bundles 100% Human Weaves$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.Ophthalmic Biometer &Pachymeter , 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%)New Cooling Fast Racing Motorcycle 400cc 250cc Efi System 150km/H. 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.Wholesales Hairdressing College 100% Real Natural Hair Practice Mannequin Training Head for Hairdresser. Moreover,China High Quality Ut-O100 Ophthalmic Pachymeter Ultrasound Scanner for Eye, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Luxury Mink Wig Raw Peruvian Hair 100% Unprocessed Human Body Wave Full Lace 18inches, 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 (Cummins diesel engine 4918416 inline 5 diagnostic tool datalink adapter), maintenance (Solar Energy System 3kwh Power Home Built in Inverter), 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,50cc EEC Motorcycle Scooter Efi Moped), and annual cost index of mineral processing equipment.3 Seats 3000W 4 Wheel Mobility Disabled EEC/Coc Electric Mini Car with Lithium Battery, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,50cc/125cc Euro 5 Certificate Gas Scooter Motorcycle Moped Efi . Maximum MAER of 13.5% and minimum R²of 0.Zhenhua New T5 300cc Motorcycle Efi-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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