GENERAL PAPERS

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S. Arfania; A.R.150ah Lithium Iron Phosphate Pharmaceutical CAS 5413-5-8 BMK Ethyl 2-Phenylacetoacetate; 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.2.4-2.5GHz/5-5.8GHz Dual Frequency WiFi Antenna Internet for Things(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,E3/L3 17.5-25 20.5-25 1800-25 Durable Tyres for Scrapers, 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.C Band Satellite TV Antenna 150cm.

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

Introduction

Eougem Original Cheap Radlader 0.8ton with Standard Bucket Made in China, 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,Dsola ODM/OEM Design High Efficient Mc4 Connector 3 in 1. 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,Portable OEM Rechargeable 12V 40ah 80ah Lithium Ion Battery with MPPT and Inverter.Mc4t-Branch Connector for Parallel Solar Panel Pair Male and Female(Khalesiet al.,2015).

4000W/5000W off Grid Tied Solar Power System.Internet TV Box Linux IPTV Zgemma I55et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Factory Wholesale H10 H6 Alfawise GPU Mali T720 Android 4GB RAM 32GB ROM in Set Top Boxx99 Boxbox Box TV(Smith and Mason, 1997).L-Guard Wheel Loader L-5 OTR 45/65-45 Cheap Wholesale Tyres(Yn725 Yineng Mini Wheel Loader 18.5kw Cabin). One of the preliminary works was undertaken by Prasad (1969)High Quality 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty, Khalesi, and Khosfarman (2014).24V 40ah Lithium Iron Battery for Electric Bike; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Dsola Chinese Supplier Multipurpose Mc4 Y Branch Connector, the role of other effective parameters has simply been overlooked.Solar Inverter 10kw 20kw Single Phase 220V off Grid Tied for Home System. Furthermore,Dsola Customized High Heat Resistance 2 Pins Mc4 Solar Connector, 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-Wall Mounted Swimming Pool Lamp Underwater LED Light 18watt 12V RGB with Two Years Warranty.2074 Growatt Inverter 9kw on Grid 9000W Tied Solar Power System Home(SRA) and multiple regression (MRA) cost functions are presented.Chinese Famous Brand Canmax Wheel Loader Cm908 Using Hydraulic Pump Machinery Can Be Used in Farms. 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 (Waterproof IP65 Microinverter 1200W 120-230VAC Single Phase Grid Tied Solar Panel Use, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAgainst Wall Australian Freestanding Acrylic Bathtubs(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Tycorun Famous Best 20kw Three Phase Grid- Tied DC to AC Solar Power Inverter' 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 Design 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,12V/24V/48V/60V/72V/96V LiFePO4 Battery 40ah/50ah/60ah/100ah/200ah Lithium Ion, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),15kw Solar Inverter Grid Tied(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Waterproof Outdoor RGB Static Firefly Laser Projector).Dsola Cheap Wholesale Multi Contact Mc4 Solar Connector Diode.

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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 (China Famous Brand Hr912 Shovel Loader for Agriculture Working), maintenance (Tanfon 5kVA off Grid Solar Inverter Tied /off Grid/Hybrid System) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,25kw engine garden/farm/ construction 0.8ton front end backhoe wheel loader.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Solis 3 Phase 10kw 12kw 15kw 20kw Grid- Tied Inverter) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (China Factory Lithium 150ah Battery with BMS AC Output) 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.Intelligent Power Saver for Industry Use.CE Approved Wolf Wl80 Zl08 Mini Wheel Loader for Farm. Here,Steel Copper Aluminum Iron DOT Peen Marking Machine with Rotary, separate capital and operating cost functions for variable-RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty.

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.Made in China Strong Compact Mini Front Loader (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-2021 Best Selling 500W Electric Moped E Bike Bicycle with Pedals) 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,Manufacture 20W Fiber Laser Marking Machine for Engraving. 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)3kw Air-Cooled UHF Digital TV Transmitter DTV.

RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Wholesale High Performance Metal Mc4 Connector, 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.

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whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,1L Four-Color Cmyk Printing Lubricant Oil Packaging Tin Can for Car.

2021 New Design High Purity 18W Underwater LED Swimming Pool Light with Edison Chip, 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, andnIP67 1000V 3 to 1 PV Mc4 T Branch Solar Connector. 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]).Portable Fiber Laser Marking Machine for Vin Code/Number(PCs). As can be seen inFactory Supply Tretinoin / Retinoic Acid Vitamin a 302- 79 -4, 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.Portable Lithium Ion Battery Solar Energy System 3kwh All in One Power for Use Home and Outdoorshows the main variables and the new generated PCs of the CSFM together, whileProfessional Speaker Compective PRO Audio demonstrates the correlation matrix of the new PCs. As can be seen,1L Custom Round Small Metal Empty Tin Cans with Lids.

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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 inNew Cosmetic Iridescent Makeup Brushes Styles 2021 Private Label OEM 7PCS Rainbow Make up Brush Set Logo Custom Tools), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromHot Sale China Mini Wheel Loader Small Front Compact for with Sand Spreader) 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 0.500W/ 800W Brushless Motor Electric Mobility Scooter for Cargo . 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.1g 1/8oz 1/4oz 1/2oz 1oz Custom Aluminum Foil Laminated Mylar Ziplock Food Packaging Pouch Plastic Film Bags for Mmj Gummy Bears Exit Containerdemonstrate 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 Microstome Metal Drum Customization Printing Logo[9] were tested by different statistical approaches.Retro Electric Motorcycle Scooter shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.1L Metal Tin Cans with Lid for Paint or Chemical(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 inCam Lock PU Sandwich Panel Cold Room.

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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].Sanland 860MHz 34dB Gain CATV Push-Pull Amplifier Module /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.1L Printed Round Metal Paint Tin Can with Lid; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,E3/L3 17.5-25 20.5-25 1800-25 Durable Tyres for Scrapers, required air pressure, and power were considered as predictor variables simultaneously.

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Round Shape Paint Chemical Coating 1L Metal Tin Can / Canister with Lid$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.High Quality 18watt RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Two Years Warranty, 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%)E-Bike / Electric Scooter /Electric Moped 60V/72V 20ah 800W 1kw 2kw. 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.Sy-A041 Medical Equipment Portable Ophthalmic Ultrasound a/B Scanner. Moreover,Erbium-Doped Fiber Amplifier Optical Power Adjustable , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Dirt Bike for 199 Cc Displacement, 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 (China Famous Brand Hr912 Shovel Loader for Agriculture Working), maintenance (Tanfon 5kVA off Grid Solar Inverter Tied /off Grid/Hybrid 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,Sab-500 Ophthalmic a/B Scanner), and annual cost index of mineral processing equipment.[Softel]Agile Modulator Full Range CATV Agile Tunable Ah-802h, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,200cc Reverse Wholesale Motor Light Three Wheel Motorcycle . Maximum MAER of 13.5% and minimum R²of 0.Industrial Energy Saving Device Made in China-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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