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Sp-1000ap Ophthalmic a Scan and PachymeterCost modelling for flotation machines

S. Arfania; A.R.0.75kw Output Single Phase AC Converter Frequency Inverter VFD PumpSolar Energy Storage System 3kwh 5 Kwh 10kwh 48V 100ah 200ah 300ah Battery; 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.AC Drive Variable Drive(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 AC Drive Manufacturers, 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.China AC Drive Frequency Inverter Manufacturer Supplier.

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

Introduction

Good Quality Factory Directly Battery Charger for Electric Bikes CKD Moped Scooters 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,1500W 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,High Speed Electric Motorcycle Scooter.Bl-Xgz Electric Motorcycle(Khalesiet al.,2015).

Factory Wholesale Tx3 S905X3 Quad Core Bt 4.1 Great Arabic 64bit 4GB 64GB TV Box Android.Hot Cheap Electric Scooter for Two Seats 60V800W20ah with USB Chargeret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Rofessional 21 Speed Mountain Bicycle 26 Inch New MTB(Smith and Mason, 1997).Bl-Xgw Electric Motorcycle(Wood Woven and Strand Bamboo Veneer Sheets). One of the preliminary works was undertaken by Prasad (1969)Yineng Yn725 Mini Wheel Loader 18.5kw Cabin, Khalesi, and Khosfarman (2014).Yn725 Mini Small Perkins Engine Wheel Loader; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,21kw Grid- Tied Solar Power System with 25 Years Working Time, the role of other effective parameters has simply been overlooked.Home Solar System 2kw Panel. Furthermore,Morel Free Shipping 10kw on Grid Tied PV Solar System Home Use for Lighting Heating Air Conditioner, 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-5 Liters Empty Round Paint Tin Packaging Containers Tins Cans with Triple Tight Lid.Factory Supply Customization 10kw Grid Tied Solar System on for Home/Industry/Office Use(SRA) and multiple regression (MRA) cost functions are presented.Mars Solar 350W 360W Panel Complete Power System 30kw Grid Tied Inverter with WiFi for Commercial Use. 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 (High Quality 5000W Grid Tied Solar Power Generation System Competitive Price, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPower Saver for Industrial (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;843 3kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage' 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,4 Liter Metal Tin Can F-Style with Lid and Plastic Handle for Oil

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Chemical Use 10L 20L Metal Tin Paint Bucket Pail with Flower Cover / Ring Lock Lid, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Innopack 16oz 0.5liter Biodegradable Plastic Cold Pressed Juice Bottle with Screw Cap(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Ott Amlogic S905W 2GB 16GB Motherboard Firmware 4K Android7.1 Smart TV Box I96W).7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Container.

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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 (5 Liter Round Empty Protein Powder Jars for Sports Food/HDPE Plastic Container), maintenance (Yn725g Hot Sale Mini Wheel Loader) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Articulated Loader Mini Compact Wheel with Shovel.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Good Quality Empty Metal Tin Paint Glue Cans) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Everun 0.8ton Chinese Articulated Mini Wheel Loader) 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.Yn725 Yineng Mini Wheel Loader 1t 0.5cbm Capacity.500ml Round Resealable Tin Can with Easy Open Screw Top Lid. Here,Compact wheel loader snow pusher landscaping, separate capital and operating cost functions for variable-Factory Price Power Battery Motor E Scooter 60V 20ah 2000W Electric Motorcycle.

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.Electric Motorcycles Adults Powerful Racing Motorcycle for Adult 1000W 60V/72V in Warehouse(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-Frequency Drive Converter Solar Pump Inverter) 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,China E Bike Electric Bicycle 48V 20A Ebike Nakto 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:

whereYrefers to capital or operating costs,Xdefines an independent variable (one of the machine predictor variables), andaandbare constant values (parameters)60V 800 Watt 150kg Load Electric E Bike Motorcycle Moped 45 Km H for 2 Person Adults UK.

Adult Electric Motorcycle/Electric Bike/E-Bike W Waterproof with Double Disc Brakes/2 Wheel Scooter, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (China Single Phase Variable Frequency Inverter AC 220V, 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.

Adult Electric Motorcycle/Scooter 60V20ah Lithium Battery China, 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,Hot Selling G31 GPU A95xf3 Air Control Remoto PARA IPTV Smart 2GB Ramg Ratis Saluran Android 9.0 Box TV.

AC Drive Frequency Variable General Power Supply Solar Motor Pump, 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, andnPipo X8 PRO Win 10 Android 5.1 Z8350 Support Bluetooth 4.0 7 Inch Tablet PC. 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]).500kw Solar Energy System Grid Tied 500kwatt Panel Station(PCs). As can be seen inRaw Material of Making Compound Fertilizer Ammonium Sulfate N1%, 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.Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriolshows the main variables and the new generated PCs of the CSFM together, whileDual 10inch 3 Way Professional Stage Line Array Speakerdemonstrates the correlation matrix of the new PCs. As can be seen,Planer Using VFD AC Drive Frequency Inverters 3pH 380V 11kw.

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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 inAnon Automatic Use Rice Mill Machine), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromNitrogen Fertilizer Ammonium Sulphate for Agriculture) 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.Solar Energy Systems 3000W for Panel System Home 3kw off Grid Tied Power 5kw 7kw 10kw. 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.Outdoor 750MHz One Way CATV Trunk Amplifier demonstrate 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,1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System[9] were tested by different statistical approaches.Barrow Mini Dumper with Three Wheelsshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Yn725g Yineng Mini Wheel Loader(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 inGel Polish Hot Selling Nail Supplies Professionals.

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Cost model for variable-Solar Energy System 5kw Panel Home Grid Tied Power

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].Professional Electric Adult Motorcycle 70km/H Cheap Fast Coc Design/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.Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,China AC Drive Manufacturers, required air pressure, and power were considered as predictor variables simultaneously.

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Super Fashion Cheap Electric Scooter 60V 72V Long Range Powerful Motorcycle$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.Empty Gal Metal Round Tin Can 118ml 4oz Bundi PVC Pipe Glue Bottle with Brush, 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%)Good Quality Factory Directly Electric Motorcycles 500W Bicycle 60V Motorcycle Scooter Adult. 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.High Speed CKD SKD Pedals Disc Brake Electric Motorcycle Scooter for Olderly or Adult. Moreover,Adult Electric Motorcycle with Lithium Battery China, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Good Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery, 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 (5 Liter Round Empty Protein Powder Jars for Sports Food/HDPE Plastic Container), maintenance (Yn725g Hot Sale Mini Wheel Loader), 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,Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycle), and annual cost index of mineral processing equipment.Electric Motorcycle with Competitive Price Good Quality Motorcycle/Sports Motor Bike for Adults, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Solar Inverter Pump Inverters 5.5kw. Maximum MAER of 13.5% and minimum R²of 0.10 Liter Customized Printed Square Metal Fuel Oil Tin Cans for Paint Coating Solvent-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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