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## Fast Build Prefabricated Sentry Box

*On-lineÂ version*Â ISSN2411-9717

*PrintÂ version*Â ISSN2225-6253

### J. S. Afr. Inst. Min. Metall.Â vol.117Â n.1Â JohannesburgÂ Jan.Â 2017

#### http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

**GENERAL PAPERS**

**Centella Asiatica Extract 99% Asiaticoside 16830-15-2Cost modelling for flotation machines**

**S. Arfania; A.R.150cc Motorcycle****Bocinas Prosound 18 Pulgadas PRO Speaker Ruidoso Audio Subwoofer Parlente Hot Sale; 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.5L Vegetable Cooking Oil Custom Tinplate Square Can(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,Hot Sale Coolest China Cheap Electric Motorcycle 500W/ 800W /1000W/2000W 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 R^{2}, 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 R^{2}of 0.Wholesale Plastic Square 1 Liter Fertilizer Bottle.

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

**Introduction**

Accredited Ce E Bike Batteries 36V 48V Ebike Battery 10ah-40ah Lithium, 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,50cc Motorcycle. 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,Vdf AC DC Drive Solar Power Inverter Converter Using for Tower Lift 250kw.Zhenhua Classic Motorcycle Dax 125cc Euro4(Khalesi*et al.,*2015).

Super Cooling Smart Electric Scooter 500W 800W Motorcycle.Wholesale 1L Round Empty Fully Synthetic Brake Oil Tin Can with Metal or Aluminum Caps*et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Titan 4 Wheel Driving 0.8ton Mini Micro Compact Loaders Garden and Farm Using(Smith and Mason, 1997).Scooter / Motorcycle Electric Motor Power 800W 1kw 2kw 3kw(Diesel Engine Parts Fuel Injection Nozzle Dlla152sm043). One of the preliminary works was undertaken by Prasad (1969)5GHz Dual Pol Sector Antenna with Enclosure, Khalesi, and Khosfarman (2014).5GHz 18dBi Dual Polarized Enclosure Antenna ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,2.4/ 5GHz 10dBi Rubber WiFi Antenna, the role of other effective parameters has simply been overlooked.Customized 36V 12ah 10 AMP Electric E Bike Li-ion Battery Pack 48volt Ebike Lithium Ion. Furthermore,5GHz 18dBi Sector WiFi Antenna, 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-125cc Retro Scooter Motorcycle.Handheld Double Heads WiFi Wireless Ultrasound Color Doppler Probe for iPhone/iPad/Android/Ios(SRA) and multiple regression (MRA) cost functions are presented.Hot Selling 800W Brushless Motor Electric Scooter Motorcycle. 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 (Lady's E-Scooter 800W Hot Sale Made in China, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inEEC EPA Extreme Adult RC Snowmobile(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;High Quality Electric Motorbike with 800W Motor' 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,5GHz 29.5dBi Die Cast Grid Antenna

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,No Flicker Glare 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with CE RoHS IP68 Reports, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),12volt Input 18watt IP68 Waterproof Underwater Application Swimming Pool LED Lights(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Beove Baby Disposable Diaper with Shea Butter).5GHz 23dBi Dual Polarized Panel Antenna .

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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 (5GHz 27dBi Enclosure WiFi Antenna), maintenance (TUV Certificate Gried Tied on Grid 20kw Solar PV System) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Quality 18W 12V Resin Filled Flat LED Swimming Pool Underwater Light with Edison Chip.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (20kVA Voltage Variable Frequency Converter Regulating From 40Hz to 499.9Hz 0-520V) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (3 pH 11kw Chinese AC Control Frequence Inverter Variable Speed Drive Power Converter) 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.Water Proof Vet Ultrasound Scanner.Three Phase Vector Frequence Converter with High Performance. Here,Replica Aluminum Alloy Wheels for BMW 1/2/3/4/5/6/7 Series, separate capital and operating cost functions for variable-16"X6.0" 16'x7.0' 16X8.0 16X10 Trailer Steel Rim Wheel.

*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.AC Drive Frequnce Converter Frequence Inverter Manufacturer Supplier(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-14"X5.0"J 14'x5.5'j 14X6.0j 14X7.0j Inch Steel Wheel for Sport Trailer) 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,Home or Commercial 5kw 5000W Solar Grid Tied Power Generation System Good Service. 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:

where*Y*refers to capital or operating costs,*X*defines an independent variable (one of the machine predictor variables), and*a*and*b*are constant values (parameters)Eougem Zl08 0.8 Ton Mini/Small Articulated Hydraulic Mini Front End Loader.

Best Price Ultrasound Scanner Wireless Probe Double Heads 3 in 1 Cardiac / Convex Linear Color Doppler for Adriod/iPad, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Ultrasonic a B Scan Ophthalmic Eye Ultrasound Scanner with Low Price, Khalesi, and Khosfarman, 2014).

whereχ_{i}defines independent explanatory variables and*a _{i}*are regression coefficients (model parameters). As was mentioned, independency of

*x*variables 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.

_{i}Ce Approved Medical Portable Bone Densitometer Ultrasound Machine , R^{2}, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R^{2}is 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]:

where*X _{obs}*is the observed value,

*x*the estimated value at time/place

_{e}*I,*and n,Vitreous Hemorrhage .

500kw on Grid Tied Hybrid Solar Power Plant Station System, analysis of residuals, tests of MAER values and evaluation of R^{2}were 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).

where*C _{e}*is the estimated cost,

*C*the actual cost, and

_{a}*n*High Quality Classic China Motor Cargo Three Wheel Motorcycle . 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]).Motorcycle with Dryweight 120-220kg(PCs). As can be seen inManufacturer Wholesale Good Quality Empty 1lt Metal Paint Glue Tin Cans with Lever Flat Pry Lid, neither*X _{1}*nor

*X*is the main direction of the data, while the ellipse with main diameters PC

_{2}_{1}and PC

_{2}matches 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 and

*X*as Equations [5] and [6]:

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In this research, main variables of*X _{1}, X_{2}*.

*.. X*were 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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Zl08 Chinese Small Compact Garden Farm Tractor Front End Mini Wheel Loader with Attachments,B5 200cc 250cc 300cc Cargo Tricycle with Cabin Motorcycle Three Wheel Loncin Zongshen Lifan Engine(CSFM) is presented here as an example.Professional Line Array System Single 10 Inch Neodymium Vr10illustrates the high correlation between predictor variables for the CSFM.

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 Cat Food Bagsshows the main variables and the new generated PCs of the CSFM together, whileFactory Wholesales Painkiller Solutions Free Sample Novocaine CAS: 51-05-8 Canada Procaine Promotiondemonstrates the correlation matrix of the new PCs. As can be seen,Growatt 50000W 60000W 70000W 80000W Grid Tied Solar Inverter.

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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)

where*X _{i}*are main technical variables (like power or required air),

*a*are calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inGood Design Pellet Ring Die for Pelletizer), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromFuso Truck & Bus Turbo Td04 49377-03041 Me201258 for 4m40 Engine Mitsubishi Pajero) 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.

**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.ACTIVE AL908 0.8 ton Mini Wheel Loader with Wood Gripper and Pallet Fork. The R^{2}is about 0.94 for both cases,*i.e.*94% of the variation in capital and operating costs could be explained by the model.Wireless PA System for Classroom and Churchdemonstrate 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,Sp-1000ap Ophthalmic a Scan and Pachymeter[9] were tested by different statistical approaches.Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptiveshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Adult 150cc 200cc 300cc EPA Approved Three Wheel Mptorcycle Scooter(a1, a_{2}, a_{3}) and new intercept (a_{0}) 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 inCCD Wheel Alignment with CE.

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*Cost model for variable-300cc Road Legal Ault Street Gas Three Wheel Scooter*

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].China Supplier Ophthalmic Equipment Ultrasound Ab Scan/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.Vimode Electric Scooter Adult Motorcycle for Adults 800W; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Hot Sale Coolest China Cheap Electric Motorcycle 500W/ 800W /1000W/2000W Scooter, required air pressure, and power were considered as predictor variables simultaneously.

150cc/200cc/250cc / 300cc Three Wheel Cargo Motorcycle /Tricycle. Moreover, the operating cost was detailed in different cost items.Heavy Duty Tricycle 250cc, indicated in5L Vegetable Cooking Oil Custom Tinplate Square Can, and major extrapolation should be avoided.

Electric Motorcycle Fashion Design 800W with Removable Battery$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.City Scooter 800W Long Range Electric, 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 R^{2}values 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%)800W Electric Scooter Motorcycle Bicycle with Folding Rack. 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.Wholesale Adult Tricycle Price Adults Tuk Motorcycle in India. Moreover,Sporty 500W/ 800W /1000W, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (5GHz 10dBi Outdoor WiFi Omni Antenna , 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 (5GHz 27dBi Enclosure WiFi Antenna), maintenance (TUV Certificate Gried Tied on Grid 20kw Solar PV System), 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,Ho-500 Ce Approved High Quality Eye Diagnosis System Ophthalmic Ultrasound Scanner), and annual cost index of mineral processing equipment.Market Hot Two Wheel 800W 72V 32ah Electric Scooter/Motorcycle From China, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},Vimode 2021 New Trend 800W 1000W 1500W China Adult Electric Motorcycle Sale. Maximum MAER of 13.5% and minimum R^{2}of 0.Police Motorcycle 250cc-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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