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## Infrared LED 940nm for Human Sense Application

*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**

**Spiral Reversible Replacement Solid Tungsten Carbide Round or Square Indexable Woodturning Cutters Inserts for Wood TurningCost modelling for flotation machines**

**S. Arfania; A.R.OEM 1500W EEC Electric Scooter ****42 Inch Alone Standing Interactive LCD Touch Screen Information Kiosk; 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.New Arrival 4K Smart S905X2 TV Box 4+64GB X96 Mini(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,0.25mm Natural Wood Face Veneer, 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 0.2L Empty Tin Container for Engine Oil Lubricant.

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

**Introduction**

High-Performance Three Phase Frequency Converter 380V 50/60Hz, 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,Electric 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,EEC Electric Scooter .800w /1100w EEC Electric Scooter (Khalesi*et al.,*2015).

Factory Produce Natural Face Veneer Size 1220X1830X0.25mm.Electric Motorcycle/Scooter/Bike *et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Customization Available Modern Popular Home Furniture Set Living Room Leather Sofa(Smith and Mason, 1997).800W EEC Electric Motorcycle(Factory Direct Sale on Grid Complete Tied Solar Systems 1kw 10kw Panel System). One of the preliminary works was undertaken by Prasad (1969)No Foldable 40-60km Range Per Charge EEC Electric Scooter, Khalesi, and Khosfarman (2014).1 Wheel Electric Motorcycle/One Scooter; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High-Performance Frequency Converter/AC Drive 380V 50/60Hz, the role of other effective parameters has simply been overlooked.Three Phase 380V Small Frequency Converter. Furthermore,Hot Sale High Performance Vector Frequency Converter 380V 45/55kw, 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-Single/Three Phase 220V 380V Vector Control Frequency Converter.Factory-Enginneered Veneer Ash in 0.30mm(SRA) and multiple regression (MRA) cost functions are presented.Small Frequency Inverter 380V 50/60Hz. 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 (China Single Phase Variable Frequency Inverter 1.5kw, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAlloy Wheels (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;1.2mm White Poplar Veneer From Factory for Exporting' 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,1250X2500mm Rotary Cut Okoume Veneer Cheap Prices

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Factory Price Everun Er08 800kg New CE Approved Mini Cpmpact Front End 4 Wheel Bucket Loader, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),2862 Easy Installation 5kw 6kw 8kw 10kw 12kw on Grid Solar System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Quality G80 Forged Wide Opening Iron Eye Sling Pipe Hook).Eougem CE 1.0 Ton Hydraulic Mini Radlader Zl08.

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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 (Wolf 0.8t 800kg Mini Loader with Euro 3 Engine), maintenance (500- 800W 48V 20ah OEM manufacturers Electric Scooter) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,800W Brushless Adult Electric Scooter.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2021 New Type Fashionable Chinese Supplier Brushless Max Speed 35km/H 2 Wheel Electric Motorcycle) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Best Chinese Big Wheel Electric Motorcycle Racing Bike Adult Bicycle) 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.Bd600 AC Frequency Inverter/Converter/220 V to 380 Inverter.1L Beer Can. Here,High Quality Electric Scooter Factory, separate capital and operating cost functions for variable-Cute Electric Scooter Motorcycle with Pedals 60V800W14ah Lithium Battery for Adults.

*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.1L Panit Can(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-1L and 5L Can for Antifreezing Liquid) 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,2021 Fashionable High Quality with Lithium Battery Electric Scooters EEC Vespa Citycoco Newest Model Motorcycle. 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)Pump Inverter Variable Frequency Drive Manufacturers AC Supplier.

Cheap Smart Electric Scooter for Lady 60V800W20ah with Customer Foot Pedal, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Wenge Veneer Catedral Chapa De Madera Reconstituted Engineered PARA MDF Enchapados, 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}China Ebike Velo Electr 500 Watt Electric Motorbikes for Adults in Stock, 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,Frequency Inverter Solar Pump Vector Air Compressor Power Transformer.

Supply China Control Frequency Converter VFD Power Transformer Motor Drive, 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*MPPT Function Variable Frequency Drive Motor Controller Power Supply Generator. 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]).0.75kw-11kw Three Phase 380V Frequency Inverter VFD(PCs). As can be seen inOEM PVC Home Suede Inflatable Sofa with Footstool, 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.

_{n}*2885 Factory 25 Years Warranty Solar Power Kits 5kw 8kw 10kw 12kw Grid Energy System*

2876 10kw Home Used Solar Power System on Grid Roof,2879 Free Shipping 10kw 12kw 15kw Home Used Solar Power System on Grid Roof(CSFM) is presented here as an example.E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 29.5-25illustrates 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.Solar DC Junction Box Medium 4 Bar 3 Diodes 250W~300W with Mc4 Plugs and Cable Panelshows the main variables and the new generated PCs of the CSFM together, whileCosmetic Pearlescent Pigments Chameleon Color Travel T8207n Multicolor Metal Effect Gold Green Bluedemonstrates the correlation matrix of the new PCs. As can be seen,AAA Grade 0.9mm Poplar Core/Veneer for Plywood/Furniture.

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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 inCe Protective Surgical Medical Face Mask), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found from2021 High Quality Marine 1400W Hybrid Power Inverter Solar System Portable with 3kwh Lithium Battery) 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.Grade AA Veneer Furniture Building Material Plywood to Dubai. 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.12" Line Array Loud Speaker Sound System Professional PAdemonstrate 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,1L Wholesale Round Tin Can for Paint/Engine Oil with Tight Lid[9] were tested by different statistical approaches.26 Inch Mountain Bike From China Bicycleshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Manufacturer of Enigine Oil Can(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 in220V 230V 60Hz 50000 BTU Air Cooled Split Conditioner.

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*Cost model for variable-Small Wheel Loader Wl80 800kg Loaders for Farm Work*

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].1L Tin Can for Camellia Oil /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.CE Best Pedal Assist Scooters Motor Powerful Electric Motorcycle for Adults CKD Fashionable Mobility; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,0.25mm Natural Wood Face Veneer, required air pressure, and power were considered as predictor variables simultaneously.

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Set Top Box T95q S905X2 4G 32g Android 9.0 HD TV Kodi Quad Core$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.Hot Popular Fast Shipping H. 265 Standars Czech Republic Channels Internet TV Box, 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%)Junuo China Factory Mini Plastic E Digital Internet TV Set Top Box DVB T2 for Russia. 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.5 Litre Extra Olive Oil Tin Can . Moreover,DC/AC Frequency Inverter Solar Pump Power 400-600V Input 2.2kw, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Frequency Converterlow Industrial Power Inverter, 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 (Wolf 0.8t 800kg Mini Loader with Euro 3 Engine), maintenance (500- 800W 48V 20ah OEM manufacturers Electric Scooter), 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,2370 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use), and annual cost index of mineral processing equipment.China Electric Moped Motorcycle Sale for Adults Mobility E Scooter with Battery, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},Three Phase 380V/ 0.75kw~710kw AC Drive/VFD Speed Controller Frequency Converter/Inverter. Maximum MAER of 13.5% and minimum R^{2}of 0.DC/AC Frequency Inverter Solar Pump Power 400-600V Input 4kw-feasibility and even feasibility study level of projects.

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Mular, A.L. 1982.2021 Wuxi Best Selling New Type Racing Mobility Adults 2 Wheels Electric Motorcycles E Motos CKD Scooters.*Grid Tied Solar Energy System 5kw 10kw 20kw 50kw 100kw 200kw 300kw 500kw.*2021 Hot Selling Two Wheel Cheap Powerful Electric Moped Motorcycles with Pedals Chinese Supply CKD Scooter, Montreal. 265 pp. [aluminium LCD wall panel surveillance flat display]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Titan Mini Loader 800kg New Front End Radloader with Spare Parts Best Shipping Agent Service.*Journal of Manufacturing Science and Engineering,*vol. 128. pp. 563-575. [Pharmaceutical Intermediate 1]

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Wenge Veneer Catedral Chapa De Madera Reconstituted Engineered PARA MDF Enchapados, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Factory Price Zl08 Mini Articulated Hydraulic Front End Farm Wheel Loader.*Tunnelling and Underground Space Technology,*vol. 27. pp.133-141. [Ce ISO SGS Certification Wd Series Full Automatic Linear Type PE Plastic Film Stretch Shrink Wrapping Machine Packaging]

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Smith, A.E. and Mason, A.K. 1997. Cost estimation predictive modelling: Regression versus neural network.*The Engineering Economist,*vol. 42, no. 2. pp. 137-161. [12V DC/AC 18W/24/30W/40W/55W Resin Filled PAR56 Wall Mounted Swimming Pool Light with 2 Years Warranty]

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USBM. 1987.Factory Supply OEM Support Mxq PRO Rockchip Rk3229 Android 7.1 TV Box,Natural Okoume Venner 0.90mmx6X9FT-metallic minerals expected fossil fuels in the United States and Canada.*Openfile report*10-87. US Bureau of Mines, Denver, CO. 134 pp. [Four Lens Home Party light laser show projector]

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Paper received Apr. 2015

Revised paper Received Jul. 2016

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