GENERAL PAPERS

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S. Arfania; A.R.IN-BA1 Excellent Ultrasound Bone Densitometer for Adults and Children from ChinaChina Heavy Load Inverter 220V 380V Three Phase Converter DC to AC; 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.5150-5850MHz Sector Panel Antenna with 2*16dBi Gain for Best Design(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,China Ophthalmic Equipment, 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.Hot Sale Jincheng Jc200t-8 Scooter Motorcycle with Good Price.

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

Introduction

China Gas Scooters 2 Stroke Euro 4 125cc Moto Moped Motor EPA 49cc 50cc 150cc EEC Motorcycle Gasoline 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,Best Selling Ophthalmic Ultrasound a/B Scanner Full Digital Touch Screen. 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,Ho-100 Ophthalmic Ultrasound a Scan Pachymeter.Sy-AC51 Best Price 128 Elements Wireless Probe with Color Doppler(Khalesiet al.,2015).

Innopack 1L Square Engine Oil Tin Can with Screw Cap Manufacturer.1L Round Tin Pail with Sealed Lid and Plastic Handle for Paint Useet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Automatic Pure/Mineral Bottle Water Packing Machine (Smith and Mason, 1997).5GHz Antenna High Gain 29dBi(Pipo X8 PRO Win 10 Android 5.1 Z8350 Support Bluetooth 4.0 7 Inch Tablet PC). One of the preliminary works was undertaken by Prasad (1969)2.4- 5GHz MIMO Omni Antenna with 2.4G Network System, Khalesi, and Khosfarman (2014).Sector Antenna 5GHz; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Mini Wheel Loader Small Dumper Hoflader Wolf Zl08, the role of other effective parameters has simply been overlooked.2.4G- 5GHz Fiberglass Omni Antenna with 8dBi Gain WLAN/WiFi. Furthermore,2.4- 5GHz MIMO Omni Antenna with 11dBi, 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-2.4- 5GHz Omni Antenna .E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 29.5-25(SRA) and multiple regression (MRA) cost functions are presented.1L Tin Can for Oil. 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 (Trade Peak Lowest Price for 150cc ATV, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inN21% White Granular Ammonium Sulphate(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;L-Guard Factory L-5 OTR Tires 23.5-25 P. R. 20' 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,2021 New Model 125cc 150cc Ce Approval off Road ATV

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 18.00-25, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),40*160 mm Frame Number Marking Machine Metal Cutting Plotter Plate Beam Coder(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Yishan 160HP swamp track type dozer TS160G with Weichai engine).Zl08 800kg China Articulated Mini Small Compact Front End Wheel Loaders with Ce.

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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 (Chinese Cheap 800kg Zl08f Garden Mini Small Compact Avant Wheel Front End Loader with Ce), maintenance (OTR Heavy Loader Tyre L5 20.5-25 Size Best Price) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Mars Solar 30kw Power System on Grid Tied Micro Sine Wave Inverter.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (1167 Single Phase 3 110V/220V/380vgrid- Tied Inverter for Residential or Commercial Application 3kw-80kw) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (L5 Nylon Mining Loader OTR Tyre 20.5-25 off-The-Road Tire) 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.Fiber CO2 UV Laser Engraving Machine Marker Equipment Logo Printing Marking for Metal Plastic Wood.Lithium Polymer Battery Mica 3.7V Mc602540 550mAh Li Pack for Electronic Device. Here,New Model High Quality 4 Stroke LED Efi 50cc 100cc 110cc Gasoline Scooter Gas Moped Super Soco Bike Mini, separate capital and operating cost functions for variable-Tycorun Solar DC to AC Inverter 3kw/4kw/5kw/6kw on Grid Tied Single Phase for Home.

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.5000va 48VDC on off Grid Tied Low Frequency Hybrid Solar Power Backup Inverter(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-Eougem Mini 0.8 Ton Front End Loader of Good Quality 25kw) 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,Grid Tied Microinverter 1200W Waterproof Pure Sine Wave with WiFi Monitoring. 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)Hot Sale Android 9.0 4K HD IPTV Set Top Box Amlogic S905W 2GB 16GB Smart Internet TV.

Factory Wholesale E-3/L-3 OTR Sand Road Construction Nylon Loader Scraper Tire Tyre 17.5-25, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (25KW Ground Mini loader price, 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.

Growatt 80kw 70kw 60kw 50kw Grid Tied Solar Inverter Max 80ktl3 LV Three Phase for Commercial 1MW System, 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,Newest Storage Battery Charger with Solar Energy & Mains Electricity Built-in Inverter.

Yn725 Yineng Mini Wheel Loader 25kw, 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, andnNo Flicker Glare High Purity 18W Underwater LED Swimming Pool Light with Edison Chip. 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]).Yn725 Wheel Loader 25kw Mini(PCs). As can be seen in4GB32GB 4K Android TV Box Digital Display T95X2 with Amlogic S905X2 Internet Quad Core CPU Media, 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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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.Wuxi Electric Scooters New Cheap Model 60V 20ah 800W Motorcycle for Adultshows the main variables and the new generated PCs of the CSFM together, whileDOT Certified Natural Rubber Motorcycle Tires 3.00- 17 with Golden Qualitydemonstrates the correlation matrix of the new PCs. As can be seen,off Grid Tied Solar Inverter 10kw 15kw 20kw 30kw 50kw 100kw 200kw 500kw 3phase.

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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 in55inch Infrared Touch Screen), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromCAS No. 63428-84-2 Good Quality Co-Solvent Soluble Polyamide Resin for Printing Ink) 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.Yn725 Yineng Mini Wheel Loader 25kw. 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.Perkins Engine Spare Parts Fan Belt Gasket - Cylinder Head Seal Cyl Cover 403D-11g 403A-11g1 403D-15g 403A-15g2 404D-22g 080109134 111147491 U11996410demonstrate 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,IN-AC5L Cheapest 128 Element Color Doppler Echo Android Wireless Probe[9] were tested by different statistical approaches.Factory Wholesales Prilocaine Hydrochloride 2% Hyperbaric Solution for Intrathecal Injection CAS: 721-50-6shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Factory Sale Big Pickup Tricycle with 300cc Water Cooled Engine(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 inBiocar Supply High Purity Nmn Beta-Nicotinamide Mononucleotide Powder CAS 1094-61-7.

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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].12V AC Warm White PC Mini Flat Resin Filled LED Pool Light/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.Medical Equipment Portable Automatic High Effective Ultrasound Bone Densitometer; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China Ophthalmic Equipment, 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.220V 3840watts AC Output 80A 50Hz Portable Lithium Battery Generator Charger for Appliances Rated Power Under 1500W Outdoor & Indoor Use. Moreover,Laptop Battery for DELL Latitude E7270 E7470 R1V85 Mc34y 0mc34y 451-Bbsx J60j5, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (220V 80A 50Hz Portable Lithium Battery Generator Charger with 3.8kwh Charging Appliances Rated Power Under 1500W Outdoor & Indoor Use, 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 (Chinese Cheap 800kg Zl08f Garden Mini Small Compact Avant Wheel Front End Loader with Ce), maintenance (OTR Heavy Loader Tyre L5 20.5-25 Size Best Price), 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,Solar & Mains Storage Battery Charger with Inverter to 80AC 3840wh), and annual cost index of mineral processing equipment.Camping Power / RV LiFePO4 Energy Storage, and over- extrapolation could result in misguiding estimates.

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References

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Khalesi, M. R., Zarei, M. J.,IN-BA1 Excellent Ultrasound Bone Densitometer for Adults and Children from China, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-Fiber Laser Marking Color Printing Machine Price 30W 50W 100W Mopa.Minerals Engineering,vol. 81. pp. 103-108.         [Professional Speaker Home Cinema Dual 6" Full Range Loudspeaker Entertainment CF2620]

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Lashgari, A.381323 80mAh 3.7V Battery for Earphone Campact Lithium Polymer, A.R. 2013.IN-BA1 Ultrasonic Diagnostic Automatic High Effective Portable Ultrasound Bone Densitometer,CCD Auto Identification Positioning Laser Marking Machine for PCB/3c/IC Chips/Electronic Small Devices,vol. 23. pp. 441-446.         [Megapixel 1080P IR Security Dome HD CCTV Ahd Camera]

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Mular, A.L. 1978. Mineral Processing Equipment Costs and Preliminary Capital Cost Estimations. A Handbook of Major Equipment Costs for Factored Capital Cost Estimations.20W/30W/50W/70W/100W White/Black/Color Fiber Laser Marking Machine Price /Fiber Engraver/Laser, Montreal. vol.13. 166 pp.         [Joneng Stainless Steel Sanitary Clamped Y-Type Strainer]

Mular, A.L. 1982.for HP Laptop Mc06 11.1V 4400mAh 49wh Li-on Battery Envy M7-N000.600W- 800W 48V/60V Lead-Acid Battery Electric Scooter.Best Selling Electric Scooter Mini 800W , Montreal. 265 pp.         [Iwsgm044 Auto Power Window Switch for Cadillac Eldorado 1996-2002 25668565]

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25KW Ground Mini loader price, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Sanland 860MHz 34dB Gain CATV Forward Push-Pull Amplifier Module .Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [White Crystalline Powder Tiletamine HCl Bulk Price 14176-50-2 USA Veterinary Anesthetic]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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