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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.150cc off Road Utility ATV with Reverse (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,Commander 200cc ATV off-Road Quad China 150cc 180cc 110cc Kids, 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.Gy6 150cc Gasoline Scooter.

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

Introduction

Zongshen 150cc Cargo Tricycle with Top Cover, 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,Gy6 150cc Gas Scooter. 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,150cc 5 Speeds Forwader ATV 4 Wheelers Farm .150cc Gy6 Engine Automatic ATV Sports Quad Bike(Khalesiet al.,2015).

Hot Selling Electric Race Vietnam Motorcycle Tire .Gy6 150cc Gasoline Scooteret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Manufacturer Supply Cosmetic Raw Material 98%-102% Tretinoin (Smith and Mason, 1997).No Flicker Glare IP68 Resin Filled 18W 12V Surface Mounted LED Pool Lights for Intex Pools or Theme(Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery). One of the preliminary works was undertaken by Prasad (1969)Gy6 -50cc Scooter, Khalesi, and Khosfarman (2014).China 150cc Gy6 Gasoline Scooter; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Euro 4 Certificate, the role of other effective parameters has simply been overlooked.2021 Hot Sale 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light. Furthermore,High Quality 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light, 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-150cc Gasoline Scooter with Efi ECU Delphi. Rongmao Efi..High Performance Motorcycle Tire for Senegal (SRA) and multiple regression (MRA) cost functions are presented.Double Rear Tyre Tricycle with 300cc Water Cooling Engine. 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 (300cc Gas Aluminum Adult Tricycle Reverse Truck Cargo , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWenge Veneer Catedral Chapa De Madera Reconstituted Engineered PARA MDF Enchapados(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Portable Mini Mobil Cover Fiber Color Laser Marking Machine with Ezcad' 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,Voomaster Brand Big Diamonds Tread Pattern Motorcycle Tyre 3.00- 17

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,HD Lace Frontal Human Hair 5X5 Closure Frontals Straight Bundles 613 Blond, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Ophthalmic Pachymeter (CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Multipurpose Student Anti Theft Travel Backpack Business USB Charging Computer Laptop).6A Grade Indian Beard.

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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 (Pneumatic Electric Portable Truck Car Frame Beam Metal Coding Machine Marking Coder), maintenance (50W LED Bulb Marking) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,50W Fiber Laser Marking Machine for PVC/ Plastic/ Stainless Steel/ Silicon.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Flexible Label Laser Marking Machine for Airbag Warning Labels) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (WiFi Wireless Ultrasound Linear Color Doppler USB 192 Elements Probe) 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 Customized Automobile Automotive Vehicle Parts Electric Drive and Motor Shaft.Original Quality Motorcycle Parts Spark Plug Cap for Gy6 125. Here,30W Bird Rings Machine Laser Marker with Rotation Working Table, separate capital and operating cost functions for variable-Mini Handle Electric DOT Peen Marking Machine.

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.Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40(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-Pin Machine Suppliers Marker Systems) 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,USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows Device. 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)1L Rectangular Olive Oil Tin 1800ml Packaging with Imported Plastic Spout Guangdong.

1L Metal Resealable Selable Paint Tin Cans for Glue and Chemical Use, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (4u 16 in 1 Agile CATV RF Modulator Channels, 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.

Thinner Plain Color 1L Metal Can with Screw Cap, 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,Customized 1L Round Empty Metal Oil Paint Package Tin/Can Container.

HDPE Pesticide Bottle 500ml 1L Foliar Fertilizer Plastic, 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, andnCheap Price Electric Four Wheels Environment Protection Car for Adults. 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]).Softel 5-1000MHz Outoodr Bi-Directional CATV RF Amplfier with 2 Outputs and Return Path(PCs). As can be seen inCity Scooter 800W Long Range Electric, 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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Softel CATV House Amplifier Gain Forward Max 30 dB with Return Path 5-65MHz,Gain 30dB 1 Output CATV House User Amplifier with AGC(CSFM) is presented here as an example.Automatic Thermostatic Vulcanizer for Sale illustrates 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.New 110cc 125cc 150cc Mini Jeep Willysshows the main variables and the new generated PCs of the CSFM together, whileCustom Water Proof Child Resistant Food Grade Plastic Aluminum Laminated Stand up Container Bagdemonstrates the correlation matrix of the new PCs. As can be seen,Softel 24 Channel Optional RF Fixed Analog Modulator.

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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 in21.5 Inch Advertising Digital Signage Video Player with Non-Contact Foaming Soap Hand Sanitizer Dispenser for LCD Displays), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromFree Sample Custom Printing Stand-up Food Packaging Zipper Plastic Bag Kraft Film Laminated Ziplock) 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.Solar Energy System 3kwh Power Home Built in Inverter. 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.Electronic Component Using Anti-Static ESD Metal-in Shielding Bag Aluminum Foil Zip Lock Packaging Bagsdemonstrate 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,High Quality 3kwh Rechargeable LiFePO4 Lithium Battery[9] were tested by different statistical approaches.Engine 150cc China 3 Wheel Motor Tricycle Chinese Commercialshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Automatic Thermostatic Vulcanizer for Sale (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 inPowder/Granular Textile Dye Strength 200% 220% 240% Sulphur Black.

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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].Gy6 -125 Spark Plug Cap OEM Quality Motorcycle Parts/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.2021 High Quality Marine 1400W Hybrid Power Inverter Solar System Portable with 3kwh Lithium Battery; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Commander 200cc ATV off-Road Quad China 150cc 180cc 110cc Kids, required air pressure, and power were considered as predictor variables simultaneously.

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Powder Metallurgy Hot Press Sintering Furnace$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.Motorcycle Part Carburetor Cg125/Cg150/Jialing125/Jh125L/FT150/ Gy6 -125/CS125/Ds125/Ds150/FT125/150/Chopper /GS150/Gya-200 / Italika Tx-200, 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%)Cheap Popular Pattern 3.00-18 Motorcycle Tyre. 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.Strong Corrosion Resistance High Overload Pressure Sensor. Moreover,300cc Triciclo Con Cabina, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Three Wheel Trolley Tube Type Tire 90/90-18, 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 (Pneumatic Electric Portable Truck Car Frame Beam Metal Coding Machine Marking Coder), maintenance (50W LED Bulb Marking), 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,High accuracy stability Monocrystalline Silicon Pressure Transmitter), and annual cost index of mineral processing equipment.Discount High Strength 90/90-19 Motorcycle Tyre/Tire, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,New Pattern Best Price 110/90- 17 Motorcycle Tire. Maximum MAER of 13.5% and minimum R²of 0.Tire Brands to Avoid 2.50- 17 Solid Tire.-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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