High Effective Automatic Ultrasound Bone Densitometer

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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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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.24watt IP68 Resin Filled Flat LED Swimming Pool Underwater Light(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,The Thinnest Wall Pool Underwater Swimming Light 18 Volts, 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.Rosen 7kw Grid Tied on Solar Panel System.

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


Introduction

11kw Grid Tied Solar Energy System Industrial Power Supply, 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,Customized 18mm Carb Birch Okoumen Plywood. 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 Plywood for The Furniture/Construction.3-18mm Melamine Plywood/Melamine Board/Fancy Paper Face Plywood for Indoor Use(Khalesiet al.,2015).

Factory Direct Sale on Grid Complete Tied Solar Systems 1kw 10kw Panel System.Grid Tied Wind Solar Power Systemet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Three Heads Woodworking Machine Atc CNC Router(Smith and Mason, 1997).Canada IPTV Server Subscription Resellers Panel French Spain USA Turkey Arab Android Box Smart TV Mag M3u IP(Diesel Engine Parts Fuel Injection Nozzle Dlla150p249). One of the preliminary works was undertaken by Prasad (1969)Ash Solid Wood decoration Board, Khalesi, and Khosfarman (2014).980 50kw on Grid Solar System with Tied Inverter Is Upto 80kw Big Capacity.; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,800ml Square Metal Containers, the role of other effective parameters has simply been overlooked.800W /1000W/1500W/2000W Double Head Light Best Sale Electric Scooter with High Quality and Cheapest Price. Furthermore,Hot Sale 800ml Size 1liter Engine Oil Tinplate Tin Can with Metal Pressure Lid, 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-Hot Sale Metal Round Cans for Paint or Chemical Packaging.Everun CE Approved Articulated Er08 0.8 Ton Multifunction Front End Loader with Standard Bucket(SRA) and multiple regression (MRA) cost functions are presented.Wholesale Cmyk Printing 0.5 Liter Chemical Tin Cans. 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 (Un Approved 0.5 Liter Metal Square Paint Empty Tin Cans, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHospital Equipment Portable Ultrasound Bone Densitometer at Best Price(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;5 Liter Tinplate Metal Packing Car Paint Container Engine Oil Tin Can' 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,High Duty Chinese mini loader

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Exclusive Model Electric Scooter 800W 1000W High Torque Matt Black, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),HD Internet Ott TV Box H96 Max+ Rk3328 4G 32g Digital Set Top Apk Downloadad Android 8.1(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Auto Wheel Alignment A9/Tire Changer/Garage Equipment/Automotive Equipment/Wheel Balancer/Auto Maintenance/Wheel Machine Price/Wheel).Yn725 Yineng Mini Wheel Loader 18.5kw Cabin.

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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 (Stable France IPTV Server 1year Subscription French Spain Germany Italy Android TV Box Smart Mag M3u Streaming IP), maintenance (Upgraded Full HD North America Internet ATSC TV Decoder) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Quality Cost-Effective Products12V 18W LED Swimming Pool Light with Edison Chip.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (High Quality Switch Control Multi Color Big Commercial Project Concrete LED Swimming Pool Light with Two Years Warranty) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Mag City Scooter 80km Range Two Wheel Electric Motorcycle) 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.Electric Scooter/ Motorcycle/TM-BQ.Commerical Okoume Plywood for Sale. Here,Go Kart , separate capital and operating cost functions for variable-New Go Kart .

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.Everun 0.8ton Mini Wheel Loader with Euro III Engine(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-New Model AL908 0.8ton Mini Wheel Loader with Wood Grapple 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,Cheap CE 800W Lithium Battery Power Supply and 48V/60V Voltage Electric 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)5HP 50Hz 60Hz 3.7kw 3 Phase VFD Variable Frequency Drive for Motor.

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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.

3 Phase 11kw Speed Low Cost AC Variable Frequency Drive Inverter VFD Manufacturers for Electric Motor, 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]:

whereXobsis the observed value,xethe estimated value at time/placeI,and n,Triple Phase 380V 50Hz 60Hz 7kw AC Variable Frequency Converter.

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whereCeis the estimated cost,Cathe actual cost, andnGrowatt Solar Inverter 17kw 20kw 25kw Grid Tied Three Phase on Power System. 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]).No Flicker Glare 18watt Warm White PC Resin Filled Wall Mounted Swimming Pool Lights with Edison LED Chip(PCs). As can be seen in843 3kw on Grid Solar System for Home Use Growatt 3phase Grid- Tied Inverter Output Voltage, 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.Clinical Equipment Portable Ultrasound Bone Densitometer for Hospitalshows the main variables and the new generated PCs of the CSFM together, while1L Olive Oil Can Cooking Empty Tin Can/Pot Metaldemonstrates the correlation matrix of the new PCs. As can be seen,China Frequency Inverter Drive AC Motor Speed Controller with Great Price.

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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 in1000mm Biscuits Coating Machine Chocolate Enrobing), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromCustomized 1L Round Empty Metal Oil Paint Package Tin/Can Container) 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 0.3000W Grid Tied Solar System for Home Use. 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.Jwell  PP Corrugated Roof Sheet Extrusion Machinedemonstrate 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,Factory-Full Baltic White Birch Plywood From Factory 12mm 15mm[9] were tested by different statistical approaches.Lanosterol 79 -63-0 shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Sapelli Plywood(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 inBest Price 3 Axis 1325 Atc Wood CNC Router Engraving Machine for Furniture Making.

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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].Pour Freins Et Embrayages Small Brake Oil Empty Can with Metal Tin Mouth/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.Race 4 Stroke Gasoline 9HP Reverse Transmission Go Kart; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,The Thinnest Wall Pool Underwater Swimming Light 18 Volts, required air pressure, and power were considered as predictor variables simultaneously.

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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.Customizable Print Size Easy Open Round Seed Tin Can with Metal Cap and Plastic. Moreover,350ml Cmyk Printing Empty Motorbike Engine Flush Shooter Tin Can for Speed Gasoline Additive, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (French Hot Sale Huile D'olive Food Grade Packing Olive Oil Tin Can, 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 (Stable France IPTV Server 1year Subscription French Spain Germany Italy Android TV Box Smart Mag M3u Streaming IP), maintenance (Upgraded Full HD North America Internet ATSC TV Decoder), 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,250ml Round Linseed Perilla Seed Oil Tin Can with 28mm Flip Top Cap), and annual cost index of mineral processing equipment.SGS Food Grade Certification 500ml Tin Containers Olive Oil Can, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Potassium 20.75kw Output Single Phase AC Converter Frequency Inverter VFD PumpCorresponding author

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