GENERAL PAPERS

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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.Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital(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,Apr125 White Motorcycle, 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.Apr125 Red Motorcycle.

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

Introduction

Apr125-2 White Motorcycle, 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,Underwater Swimming Pool Light Decoration LED Lamp. 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,IN-AC5MC USB mobile scan cheapest pocket handheld hospital ultrasound scanner.Euro4 4 Valves Oil-Cooled Efi 125cc/135cc Smaller Straddle Motorbike with Front and Rear Disc Brake(Khalesiet al.,2015).

350cc Motorcycle with Double-Cylinder & Water-Cooled Engine .Popular Medical Device Automatic Bone Densitometeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Gym Rubber Flooring Floor Mat Roll(Smith and Mason, 1997).Diesel Cargo Three Wheel Tricycle for Sale From China(2021 New 350W Electric Moped Motorcycle/Electric Pedal Moped/Best Motorcycle for Adults). One of the preliminary works was undertaken by Prasad (1969)Diesel Dump Central Steering Drive Three Wheeler From China for Sale, Khalesi, and Khosfarman (2014).Chinese Diesel Three Wheel Tricycle with Sunshade; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,One and Half Rows Three Wheeler for Sale, the role of other effective parameters has simply been overlooked.Chinese Wholesale Gas Powered EPA Ce Trike Scooter 300cc. Furthermore,Adult 800W Power Electric Scooter Suit for Woman, 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-800W Electric Motorbike with Front Disc Brake.Hot Selling 60V 800W /72V 1200W New Electric Scooter/E-Scooter Motorcycle(SRA) and multiple regression (MRA) cost functions are presented.dB002e Hot Sell Electric Motorcycle 800W and Kids 500W with Ce for. 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 (350W/500W/ 800W /1000W/1200W Motor Electric Scooter EW-519 Classis Model, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented in1.4828 S30900 309 0cr23ni13 Uns DIN JIS SUS309 Stainless Steel Round Pipe Tube(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;800W 60V20ah Lead-Acid Battery Electric Scooter Motorcycle' 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,Electric Dirt Bike Zm-Es18 with 500W- 800W Motor

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,5GHz 20dBi Enclosure WLAN Antenna, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),5GHz 45deg Dual Pol Sector Antenna(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (1 Liter Clear Colored Frosted or Decal Logo Glass Bottle with Stopper Beverage Mineral Water Juice Milk Bottles 500ml 300ml 550ml).5GHz 23dBi Enclosure WiFi 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 Dual Pol Sector Antenna with Enclosure ), maintenance (5GHz 34dBi Dish WLAN Antenna) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,5GHz 18dBi Dual Polarization Sector WiFi Antenna.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (18W RGB Resin Filled LED Surface Mounted Underwater Pool Light) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Poplar Film Faced Plywood Board with Carb Certificate) 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.18W 12V IP68 Waterproof LED Swimming Pool Lamps.Hot Sale on-Grid 20kw Grid Tied Solar Power Home System. Here,E1 Glue Malamine Mositure-Proof MDF with Carb Certification, separate capital and operating cost functions for variable-High Quality Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports.

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.Quality 18mm Carb Birch Okoumen Plywood(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-Mini Wheel Loader Er08 with Hydrostatic Transmission System for Sale) 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,30kw Grid Tied Solar Power System Home Popular in Philippines. 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)New Condition Large Capacity Mini Truck Dumper.

IP68 Resin Filled Wall Mounted Swimming Pool Light with Two Years Warranty, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (50cc 150cc 200CCC 300cc Adult EPA/Ce 3 Wheel Gas Scooter, 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.

2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with Edison Chip, 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,150ml Plastic Clear White Bullet Liquid Bottle for Cosmetic Industry.

14" to 22' Inch Replica Aluminum Alloy Wheel for KIA Rims, 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, andnElectric Three Wheel Motorcycle Transaxle Cargo Tricycle Rear Axle 800W 1500W 1800W 2000W Full Floating 0.5ton~1.2ton Accessories. 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]).300cc Cargo Tricycle of Asia Market(PCs). As can be seen inHigh Power Horn Speaker H3, 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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AL908 800kg Rated Load Wheel Loader with CE Approved for Sale,China Jiaxing Jarol Frequency Inverter 0.75kw/220V New(CSFM) is presented here as an example.China Supplier Ammonium Sulphate Compound Fertilizerillustrates the high correlation between predictor variables for the CSFM.

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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.Supply Rubber Accelerator Mbt 2-Mercaptobenzothiazole CAS No.: 149-30-4shows the main variables and the new generated PCs of the CSFM together, whileRosen 8kw Grid Tied on Solar Panel Systemdemonstrates the correlation matrix of the new PCs. As can be seen,Portable Laptop Digital Automatic Ultrasound Bone Densitometer.

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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 inCustomized Sinotruk HOWO Truck Cabs Heavy Cab), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromN21% Nitrogen Fertilizer Ammonium Sulphate Factory Price) 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.Jarol Solar Inverter 5.5kw 3 Phase. 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.Motorcycle Engine Spare Part Dipstick for Scooter Kymco Gy6 -60demonstrate 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,Hardwood Core Okume/Bintangor Commercial Plywood with Carb /Ce Certification[9] were tested by different statistical approaches.Frequency Drive Converter Solar Pump Invertershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Textile Crane Centrifugal 380V Variable Frequency Drive VFD(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 inChildren Outdoor Travel Student 15.6" Notebook Tablet Sleeve Business Computer School Bag Laptop Backpack.

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Cost model for variable-2021 Hot Sale Switch Control 12V 18W Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports

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].AL908 Wood Gripper Wheel Loader with Euro III Engine for Sale/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.Inverter Cabinet VFD Frequency AC Drives 15kw Motor; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Apr125 White Motorcycle, required air pressure, and power were considered as predictor variables simultaneously.

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loader with excavator grapple wheel mini for sale good quality$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 0.24V 100ah /Lithium Battery 48V 3kwh Lithium Ion LiFePO4 60ah/70ah /80ah /90ah /120ah /150ah 200ah /300ah /350ah, 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%)2ND Generation Ultrasound Bone Densitometer. 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.Replica Aluminum Alloy Wheels for BMW X1/X2/X3/X4/X5/X6 Series. Moreover,Wholesale Factory Lithium Ion Battery 12kwh 48V 100ah 250ah 300ah for Home Energy Storage System, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Effective Automatic Ultrasound Bone Densitometer, 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 Dual Pol Sector Antenna with Enclosure ), maintenance (5GHz 34dBi Dish WLAN Antenna), 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,Low Price Ophthalmic a-Scan Ultrasound with Pachymeter Ho-100), and annual cost index of mineral processing equipment.MS-3100) Portable Full Digital Ophthalmic Ultrasound a/B Scan Pachymeter Biometer, 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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