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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.Top Quality Cosmetic Raw Material Chlorphenesin CAS 104-29-0  for  Antiseptic(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,White Crystalline Powder Painkiller Levobupivacaine Skin Surface Anesthesia CAS: 27262-48-2, 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.Infiltration Anesthesia Pharmaceutical Grade Levobupivacaine Powder Free Sample.

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

Introduction

Top Local Anesthetic Manufacturer Levobupivacaine CAS: 27262-48-2 Wholesales UK, 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,99.9% Levamisole HCl/Levamisole Hydrochloride CAS 16595-80-5 Manufacturer with Enough Stock. 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,Food Grade Vitamin a Oil Palmitate 1.7million Units. CAS79-81-2.Rimonabant Powder Weight Loss Factory Direct Supply(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (Mixer Power Amplifier with USB, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inAct CNG LPG Fuel System 2568cyl ECU Kits(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Powered Line Array Active Stage Speaker' 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),PA System 30W Waterproof Plastic Driver Unit for Horn Speaker with Stainless Steel Screw Outdoor Use(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (1L Oxygen Generator O2 CE Approved Portable Concentrator with Small Power for Medical Equipment).Outdoor Show Audio Lt12 Passive Line Array Speaker System.

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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 (Karaoke Microphone Bluetooth Sound Mixer Video Conference), maintenance (Outdoor Speaker Professional Audio Factory) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Active Speaker with LED Display 15"500W Full Range Bluetooth H-15p.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Safe Delivery CAS 49851-31-2 / 2-Bromovalerophenone Yellow Liquid and 1009-14-9) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (1% 98% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free) 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.2021 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7.Raw Material Benzocaine Powder CAS 94-09-7 Pain Killer Factory. Here,80%-90% Lactic Acid CAS 598-82-3 L-Lactic, separate capital and operating cost functions for variable-PRO Audio PA Speaker .

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.Top Quality Tretinoin Powder  Retinoic Acid for Skin Care(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-TCP/IP Network Poe 15W Active Wall Mount Speaker Waterproof) 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,High Quality Skin Care Tretinoin Powder with Best Price. 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)Professional Speker System 12 Inch PA Line Array Audio S1210.

Brazilian Spanish Market 99%Pure Lidocaine HCl Drugs USP36, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Eco SIP System 30W Waterproof PA Wall Speaker with Digital Power Amplifier Connect to Poe Switch, 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.

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whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Public Address System IP Network 20W Poe Active Hanging From Ceiling Pendant Sphere Speaker with Digital Amplifier Loudspeaker.

Passive Single 12'' Line Array Loudspeaker Sound System, 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, andnTCP/IP Network 30W Poe Active Horn Speaker with RJ45 Interface Waterproof Outdoor Public Address. 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]).TCP/IP Network 15W Poe Active Horn Speaker Waterproof Outdoor Use(PCs). As can be seen inPA12 Injection / Extrusion Molding Polyamide 12 Nylon Granules, 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.Cheap Small Electric Scooter Moped 800W Motorcycleshows the main variables and the new generated PCs of the CSFM together, whileLG panel 49" advertising rack demonstrates the correlation matrix of the new PCs. As can be seen,125541 -22-2 Piperidine 1-N-Boc-4- .

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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 inSilver Sulfate), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromSingle 15 Inch High Quality Bass) 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.Blended Powder Oil Liquid Ripex 225 for Muscle Growth. 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.Vacuum Shape Velashape Body Slimming SPA Equipmentdemonstrate 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,Good Effect for Treating Infertility in Women Clom CAS: 911-45-5[9] were tested by different statistical approaches.Ergonomic Design AC 3000kg Trolley Hydraulic Hand Pallet Truckshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Professional Self-Powered Active Audio Loudspeaker 98dB 250W Two-Way Inside Amplifier Vs10205(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 inFactory OEM Coffee Stoneware Mug Sets with Customized Decals.

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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].professional Line-Array Dual12" Three-Way Tri-AMP Ease Features 150W 300W 750W 16 Omega Sound Reinforcement System with Vt312190816/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.Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,White Crystalline Powder Painkiller Levobupivacaine Skin Surface Anesthesia CAS: 27262-48-2, required air pressure, and power were considered as predictor variables simultaneously.

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2 Way Active Full Range Speaker Mini Portable Powered Loudspeaker$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.L-Arginine Nutritional Supplements  Arginine  Flavoring Agents, 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%)Indoor DJ Stage Two Way Active Line Array Cabinet Box. 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.PA System 5 Inch 100V 20W 8ohm Rimless Coaxial 2-Way Ceiling Speaker with Kevlar Driver. Moreover,98dB 250W Professional Self-Powered Active Audio Speaker Two-Way Inside Amplifier Line Array System with Vs10190905, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Lucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public Address, 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 (Karaoke Microphone Bluetooth Sound Mixer Video Conference), maintenance (Outdoor Speaker Professional Audio Factory), 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,Glycine Methyl Ester Hydrochloride ), and annual cost index of mineral processing equipment.Isoquinoline-5-Sulphonyl Chloride Hydrochloride CAS 105627- 79 -0, 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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