GENERAL PAPERS

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S. Arfania; A.R.2D Echo Color Doppler Ultrasound ScannerCATV Optical Receiver Module Bgo887bo Excellent Flatness 40 to 860 MHz; 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.Ready to Ship Best Quality Brazilian Human Hair Body Wave Extensions(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,8-30inches Malaysian Straight Hair Bundles 100% Human Weaves, 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.Ophthalmic Biometer &Pachymeter .

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

Introduction

New Cooling Fast Racing Motorcycle 400cc 250cc Efi System 150km/H, 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,Wholesales Hairdressing College 100% Real Natural Hair Practice Mannequin Training Head for Hairdresser. 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,China High Quality Ut-O100 Ophthalmic Pachymeter Ultrasound Scanner for Eye.Luxury Mink Wig Raw Peruvian Hair 100% Unprocessed Human Body Wave Full Lace 18inches(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (BAW Made of Electric Car with Lithium Battery, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSolar & Mains Storage Battery Charger with Inverter to 80AC 3840wh(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;EEC L2e 1500W 3 Wheel Enclosed Electric Cabin Scooter' names:

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),1L Tin Can with Metal Cap for Food Storage(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (New Style of High Quality Stamp Aluminum Special Academic Arges Badges Lapel Pin).Motorcycle Engine Spare Part Dipstick for Scooter Kymco Gy6 -60.

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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 (1L 1.5L Large Size Transparent Color Glass Pickles Storages Jars with Goden Tinplate Lid), maintenance (Motorcycle Plane Bearing Spare Parts for Gy6 125-Oumurs) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,1L Aluminum Tin Can for Food Packaging .076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (1L Cone Top Tin Can with Screw Cap) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Gy6 -125 Motorcycle Spark Plug Cap Parts) 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.Mining Cement Stainless Steel 316L Protective Pressure Sensor.Scooter Parts. Here,Scooter Parts Engine Gy6 -125 150cc Driven Clutch Assembly Manufacturer Price, separate capital and operating cost functions for variable-Cheap 20W Fiber Laser Color Metal Marking Marker Machine Price.

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.Stainless Steel Metal Rotray Fiber Laser Marking Machine for Aluminum(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-Flexible Label Laser Marking Machine for Automotive) 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,CATV Indoor Amplifier 8200. 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)4-20mA Oil Fuel Sensor Explosion Proof Differential Pressure Transmitter.

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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,0-5V 0-10V Raw Petro High Temperature Sapphire Pressure Transducer.

Hot Sells Solar Power System for Home 3kwh with Both AC&DC Output, 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, andn6 Injectors Testing & Coding Simultaneously Diesel Test Bench for Common Rail System Eui Eup Heui Heup Cummins Hpi . 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]).110/90- 17 Used Tubeless Second Hnad Motor Tire/Tyre(PCs). As can be seen inSupply Ammonium Polyphosphate APP , 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.Buy 99% Retinoic Acid Powder Vitamin a Tretinoin Retinol for Cosmeticshows the main variables and the new generated PCs of the CSFM together, whilePA Speaker Accessories and Parts demonstrates the correlation matrix of the new PCs. As can be seen,Screw Compressor Low Cost Small Type Pressure Sensor.

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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 inProtective Surgical Medical Face Mask), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre USA T-Butyrolactone Fast Delivery) 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 0.4-20mA Diffused Silicon Micro Size Hygienic Pressure Transducer. 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.Single 5inch Active Coaxial Full-Range Speaker PA System Indoor Room with Tx5cademonstrate 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,Lithium Battery 200ah LiFePO4 Pack 3kwh[9] were tested by different statistical approaches.5kw 10kw Stc Three Phase AC Synchronous 15kw Brush Alternatorshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Smokeless Rice Husk Continuous Carbonization Oven for Sale(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 in75inch 4K IR Touch TV Screen Smart Board Interactive Flat Panel.

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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].Ytd-Dih25 IGBT Automatic Induction Heating Machine/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.Solar Battery Solutions 3kwh Lithium LiFePO4 Hybrid System; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,8-30inches Malaysian Straight Hair Bundles 100% Human Weaves, required air pressure, and power were considered as predictor variables simultaneously.

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316L Ceramic Pressure Transducer for Health Care Industry$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.Factory Wholesale Price Industrial Induction Vacuum Furnace, 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%)Mini Size Water Differential Pressure Sensor for HVAC. 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.Water Transmitter Diffused Silicon Level Sensor for Fluid. Moreover,Digital Display Hygienic Pressure Indicator Transmitter, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Stable Universal Pressure Transmitter, 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 (1L 1.5L Large Size Transparent Color Glass Pickles Storages Jars with Goden Tinplate Lid), maintenance (Motorcycle Plane Bearing Spare Parts for Gy6 125-Oumurs), 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,4-20mA Micro Air Gas Differential Pressure Sensor Transducer), and annual cost index of mineral processing equipment.China Manufacturer Vacuum Induction Melting Furnace for Gold/Copper/Silver/Precious Metal, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Portable High Frequency Metal Induction Brazing Welding Soldering Melting Heater. Maximum MAER of 13.5% and minimum R²of 0.Motorcycle Tires/Motorcycle Tyre/Tire 2.50- 17 2.50-18 2.75- 2.75-18-feasibility and even feasibility study level of projects.

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Lashgari, A.Launch X431 PRO3s+ Hdiii 12V Car/24V Truck Full System Diagnostic Tools Auto OBD OBD2 Code Reader Scanner Pk V PRO Mk808, A.R. 2013.Hot Selling Tires Motorcycle Tyres 110/90- 17,Mini Kd Key Generator Remotes Warehouse in Your Phone Support Android Make More Than 1000 Auto Similar Kd900,vol. 23. pp. 441-446.         [Hotel Textiles Semimatte Waterproof Leather Upholstery Decorative Chair Sofa Fabric]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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