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Professional Vertical Industrial Underwater Borehole Pipe Video Inspection Camera

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

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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.Commander 200cc ATV off-Road Quad China 150cc 180cc 110cc Kids(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,Gy6 150cc Gasoline Scooter, 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.Zongshen 150cc Cargo Tricycle with Top Cover.

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


Introduction

Gy6 150cc Gas Scooter, 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,150cc 5 Speeds Forwader ATV 4 Wheelers Farm . 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 Gy6 Engine Automatic ATV Sports Quad Bike.Hot Selling Electric Race Vietnam Motorcycle Tire (Khalesiet al.,2015).

Gy6 150cc Gasoline Scooter.No Flicker Glare IP68 Resin Filled 18W 12V Surface Mounted LED Pool Lights for Intex Pools or Themeet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Waterproof Floor Standing Alone Outdoor Digital Signage(Smith and Mason, 1997).Gy6 -50cc Scooter(High Quality Cheap 200cc and 150cc Farm Utility ATV). One of the preliminary works was undertaken by Prasad (1969)China 150cc Gy6 Gasoline Scooter, Khalesi, and Khosfarman (2014).Euro 4 Certificate; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,2021 Hot Sale 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light, the role of other effective parameters has simply been overlooked.High Quality 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light. Furthermore,150cc Gasoline Scooter with Efi ECU Delphi. Rongmao Efi., 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-High Performance Motorcycle Tire for Senegal .Double Rear Tyre Tricycle with 300cc Water Cooling Engine(SRA) and multiple regression (MRA) cost functions are presented.300cc Gas Aluminum Adult Tricycle Reverse Truck Cargo . 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 (Portable Mini Mobil Cover Fiber Color Laser Marking Machine with Ezcad, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inBi-Directional Transmission Distribution Amplifier SA822(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;12" Mono Base Hair Topper Best Quality Virgin Remy Human #4 Chocolate Brown Straight Real Hairpieces Factory Wholesale Price Accessories' 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,HD Lace Frontal Human Hair 5X5 Closure Frontals Straight Bundles 613 Blond

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Ophthalmic Pachymeter , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),6A Grade Indian Beard(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Cee IEC 16A IP67 3 Poles Male and Female Industrial Socket).Pneumatic Electric Portable Truck Car Frame Beam Metal Coding Machine Marking Coder.

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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 (50W LED Bulb Marking), maintenance (50W Fiber Laser Marking Machine for PVC/ Plastic/ Stainless Steel/ Silicon) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Flexible Label Laser Marking Machine for Airbag Warning Labels.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (WiFi Wireless Ultrasound Linear Color Doppler USB 192 Elements Probe) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Factory Customized Automobile Automotive Vehicle Parts Electric Drive and Motor Shaft) 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.Original Quality Motorcycle Parts Spark Plug Cap for Gy6 125.30W Bird Rings Machine Laser Marker with Rotation Working Table. Here,Mini Handle Electric DOT Peen Marking Machine, separate capital and operating cost functions for variable-Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40.

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.Pin Machine Suppliers Marker Systems(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-USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows Device) 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,1L Rectangular Olive Oil Tin 1800ml Packaging with Imported Plastic Spout Guangdong. 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 Metal Resealable Selable Paint Tin Cans for Glue and Chemical Use.

4u 16 in 1 Agile CATV RF Modulator Channels, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Thinner Plain Color 1L Metal Can with Screw Cap, 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.

Customized 1L Round Empty Metal Oil Paint Package Tin/Can Container, 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,HDPE Pesticide Bottle 500ml 1L Foliar Fertilizer Plastic.

Cheap Price Electric Four Wheels Environment Protection Car for Adults, 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, andnSoftel 5-1000MHz Outoodr Bi-Directional CATV RF Amplfier with 2 Outputs and Return Path. 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]).Certificated Chinese Factory City Used Autos New 4 Wheels SUV Solar Electric Car and Vehicle(PCs). As can be seen in8in 8out Professional DSP Matrix Digital Audio Processors with Dp-0808date20, 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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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.White Crystal Steel Grade Ammonium Sulphate with N20.5%shows the main variables and the new generated PCs of the CSFM together, whileMini electric truck/ express vehicle/ Express vehiclesdemonstrates the correlation matrix of the new PCs. As can be seen,Cummins diesel engine 4918416 inline 5 diagnostic tool datalink adapter.

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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 inFactory Price Desktop Plasma CNC Cutting Machine 3015 Size for 20mm 30mm Stainless Steel Carbon Metal), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromMotorcycle Plane Bearing Spare Parts for Gy6 125-Oumurs) 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 3kwh Rechargeable LiFePO4 Lithium Battery. 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.Living Room Lounge Furniture Sofa Fabric 3 Seater Couchdemonstrate 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,Automatic Thermostatic Vulcanizer for Sale [9] were tested by different statistical approaches.Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.BMW N63 S63 Camshaft Alignment Tool Set (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 inYishan 160HP swamp crawler dozer TS160G with single scarifier.

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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].2021 High Quality Marine 1400W Hybrid Power Inverter Solar System Portable with 3kwh Lithium Battery/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.Motorcycle Scooter Rear Clutch Assembly for Gy6 -90 Engines; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Gy6 150cc Gasoline Scooter, required air pressure, and power were considered as predictor variables simultaneously.

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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.300cc Triciclo Con Cabina. Moreover,Three Wheel Trolley Tube Type Tire 90/90-18, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High accuracy stability Monocrystalline Silicon Pressure Transmitter, 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 (50W LED Bulb Marking), maintenance (50W Fiber Laser Marking Machine for PVC/ Plastic/ Stainless Steel/ Silicon), 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,Discount High Strength 90/90-19 Motorcycle Tyre/Tire), and annual cost index of mineral processing equipment.New Pattern Best Price 110/90- 17 Motorcycle Tire, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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