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Professional Factory Manufacturing Mini Portable Medical Oxygen Concentrator

On-line version ISSN2411-9717
Print version ISSN2225-6253

J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017

http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

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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.Hot Sale 2.4/ 5GHz 9dBi Rubber WiFi Antenna(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,5GHz 12dBi Dual Polarity MIMO Omni Antenna, 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.Electric Motorcycle Fashion Design 800W with Removable Battery.

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


Introduction

5GHz 18dBi Dual Polarization Panel WLAN Antenna, 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,Guangzhou Manufacturer Empty Anti Bacterial Diesel Additive Can for Fuel Cleaner. 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,Hot Sale Special Cooking Coconut Oil Tin Can Milk Tank Beverage Cans.Buy Food Grade Metal Material Empty Cans for 0.5-2.5L(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Retro Electric Motorcycle Scooter , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inGood Quality Empty Metal Tin Paint Glue Cans(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Carb Approved Birch Plywood' 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,Carb E0 Cabinet Grade 18mm Plywood in High Quality

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,1.5kw 220V Frequency Inverter Brands AC Drive for Electric Motor, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),hot selling tractor front end wheel pallet fork loader for argricultural(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Elegance Series Grey Artificial Engineered Quartz Stone Kitchen-Top).Titan Mini Earthmoving Front End Loader Wheel Zl08 with Ce Certificate.

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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 (Carb Bleach White Poplar Plywood LVL 12mm 18mm), maintenance (Warm White IP68 Resin Filled Wall Mounted 18watt LED Swimming Pool Light) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Wolf Loader Wl80 Zl08 Radlader Mini Wheel.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (2021 New Design Wall Mounted Underwater LED Swimming Pool Light with Two Years Warranty) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (High Quality Carb Certified Birch Faced Furniture Plywood) 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.UV Birch Plywood with Poplar Core Carb E0 Glue From Factory.17 Inch 18 Aftermarket New Design Aluminum Car Alloy Rim. Here,China Wolf Wl80 Articulated Mini Loader, separate capital and operating cost functions for variable-Digital ATSC Receiver Internet TV Set Top Box.

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.Vimode Buy 2021 Newest 48V Electric Motorcycles Made in China 800W(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-High Quality Aluminum Alloy Wheels Rims) 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,Truck Rim Steel Polished 17.5 Inch Wheel. 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)Sunpal 150kw Solar Grid Tied System Low Price.

5GHz 19dBi Enclosure WLAN Antenna, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (16 17 18 Inch Vossen CV5 Alloy Wheel, Khalesi, and Khosfarman, 2014).

whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables 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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whereXobsis the observed value,xethe estimated value at time/placeI,and n,Tubeless Steel Wheel .

Home Application on Grid Tied Solar Power System 3kw, 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).

whereCeis the estimated cost,Cathe actual cost, andnHome Use Cheap Solar Panel System 10kw Grid Tied Kit. 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]).2021 Hot Sale Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports(PCs). As can be seen inPlastic PE PP HDPE PPR Pipe Making Machine Extrusion Production Line, 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 andXias Equations [5] and [6]:

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In this research, main variables ofX1, X2... Xnwere 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.Yn725g 18.5kw Cabin Yineng Mini Wheel Loadershows the main variables and the new generated PCs of the CSFM together, whileCrovell Supply Raw Material CAS 104-29-0 Chlorphenesin for Cosmeticdemonstrates the correlation matrix of the new PCs. As can be seen,Brown Black Opaque Chemical Industrial Container 100ml Flip Top Cap Bottle.

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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)

whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inChristmas Metal Wine Charm), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromFactory 18L Wholesale Large Square Aluminium Tin Can with Screw Top Lid) 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.Nicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lights. 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.Hot Sale Am 20 "Mountain Bike with 21 Speedsdemonstrate 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,2.5A 0.4kw IP20 Jarol Variable Frequency Drive[9] were tested by different statistical approaches.2021 Hot Selling Good Performance Transparent PA12 Granules / Ployamide 12 for Commercial Installationshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.No Flicker Glare Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Edison Chip(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 inCustom Anime Toys Action Figure Dragon Ball.

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Cost model for variable-High Quality Underwater Swimming Pool Light Decoration LED Lamp

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].17 Inch Machined Aftermarket Alloy Wheel /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.2021 New Design Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Two Years Warranty; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,5GHz 12dBi Dual Polarity MIMO Omni Antenna, required air pressure, and power were considered as predictor variables simultaneously.

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Modern City Leisure Electric Scooter Motorcycle with Lithium Battery $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.White Truck Wheel 17.5X6.00 Steel Rims, 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%)7.5kw MPPT with High Efficiency Solar Water Pump Controller. 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.Carb P2 AA/Bb Grade Birch/Okoume/Bintangor/Poplar Plywood. Moreover,AC Variable Frequency Drive Single Phase, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (17.5X6.75 Heavy Duty Truck Trailer Steel Wheel Rim, 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 (Carb Bleach White Poplar Plywood LVL 12mm 18mm), maintenance (Warm White IP68 Resin Filled Wall Mounted 18watt LED Swimming Pool Light), 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,Triple Phase Variable Frequency Inverter AC Drive), and annual cost index of mineral processing equipment.White Steel Wheel for Truck 17.5X6.00, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Carb Grade 18mm Commercial Plywood. Maximum MAER of 13.5% and minimum R2of 0.Highlighted LED Electric Motorcycle with 60V 800W Power System-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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