## Services on Demand

## Article

## Indicators

## Related links

- Cited by Google
- Similars in Google

## Share

## Variable Frequency 30HP Air Compressor with Pmsm Motor

*On-lineÂ version*Â ISSN2411-9717

*PrintÂ version*Â ISSN2225-6253

### J. S. Afr. Inst. Min. Metall.Â vol.117Â n.1Â JohannesburgÂ Jan.Â 2017

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

**GENERAL PAPERS**

**Veneer Paper Tape Reeling and Gummed Repair for Joining Repairing Core Face Door FurnitureCost modelling for flotation machines**

**S. Arfania; A.R.Waterproof IP65 Microinverter 1200W 120-230VAC Single Phase Grid Tied Solar Panel Use****Professional Subwoofer Bass Speaker Single 18inch 98dB 600W with Vk18b190819; 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.Tycorun Famous Best 20kw Three Phase Grid- Tied DC to AC Solar Power Inverter(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,Solis 10kw Grid Tied Inverter Solis-10K-4G-LV Three Phases, 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 R^{2}, 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 R^{2}of 0.New Pattern Design 17.5-25 20.5-25 26.5-25 off Road Tyre.

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

**Introduction**

Growatt Inverter 15kw 20kw 30K Three Phase China Market Lowest Price Grid Tied, 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,DC 1000V Mc4 Cable Connectors . 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,2021 New Design 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports.12V/24V/48V/60V/72V/96V LiFePO4 Battery 40ah/50ah/60ah/100ah/200ah Lithium Ion(Khalesi*et al.,*2015).

15kw Solar Inverter Grid Tied.Dsola Cheap Wholesale Multi Contact Mc4 Solar Connector Diode*et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Vitamin a Palmitate CAS 79 -81-2(Smith and Mason, 1997).China Famous Brand Hr912 Shovel Loader for Agriculture Working(Electric Bike 800W ODM Mountain Ebike with Powerful Motor). One of the preliminary works was undertaken by Prasad (1969)Tanfon 5kVA off Grid Solar Inverter Tied /off Grid/Hybrid System, Khalesi, and Khosfarman (2014).25kw engine garden/farm/ construction 0.8ton front end backhoe wheel loader; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Solis 3 Phase 10kw 12kw 15kw 20kw Grid- Tied Inverter, the role of other effective parameters has simply been overlooked.China Factory Lithium 150ah Battery with BMS AC Output. Furthermore,Intelligent Power Saver for Industry Use, 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-CE Approved Wolf Wl80 Zl08 Mini Wheel Loader for Farm.Steel Copper Aluminum Iron DOT Peen Marking Machine with Rotary(SRA) and multiple regression (MRA) cost functions are presented.RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty. 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 (Made in China Strong Compact Mini Front Loader , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inHot Selling 800W Brushless Motor Electric Scooter Motorcycle(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;2021 Best Selling 500W Electric Moped E Bike Bicycle with Pedals' names:

►Manufacture 20W Fiber Laser Marking Machine for Engraving: based on 36-foot,3kw Air-Cooled UHF Digital TV Transmitter DTV,RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports,Wholesale High Performance Metal Mc4 Connector, and level control

►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,No Flicker Glare High Purity RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Edison Chip

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,1L Four-Color Cmyk Printing Lubricant Oil Packaging Tin Can for Car, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),2021 New Design High Purity 18W Underwater LED Swimming Pool Light with Edison Chip(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Silicone Cold Shrink Tube for Telecom Connector).IP67 1000V 3 to 1 PV Mc4 T Branch Solar Connector.

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 (Portable Fiber Laser Marking Machine for Vin Code/Number), maintenance (1L Empty Round Edilbe Cooking Oil Metal Tin) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,2021 Set Top Box Global Version S922X TV Smart HD Android 9.0 Internet 8K.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Max Source Fiber Machine Laser Marking for Vin Number) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (1L Custom Round Small Metal Empty Tin Cans with Lids) 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 Hot Sale 18watt RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Two Years Warranty.500W/ 800W Brushless Motor Electric Mobility Scooter for Cargo . Here,1L Microstome Metal Drum Customization Printing Logo, separate capital and operating cost functions for variable-1L Metal Tin Cans with Lid for Paint or Chemical.

*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.Free Sample 5GHz Antenna Rubber Gain(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-Sanland 860MHz 34dB Gain CATV Push-Pull Amplifier Module ) 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,1L Printed Round Metal Paint Tin Can with Lid. 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:

where*Y*refers to capital or operating costs,*X*defines an independent variable (one of the machine predictor variables), and*a*and*b*are constant values (parameters)4G 32g H96 Max 3566 World International Best Custom Internet Digital TV Converter 4K Smart Android Box.

38mm 42mm CATV Plug in 0~20dB Hfc Attenuator Pad, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Round Shape Paint Chemical Coating 1L Metal Tin Can / Canister with Lid, Khalesi, and Khosfarman, 2014).

whereχ_{i}defines independent explanatory variables and*a _{i}*are regression coefficients (model parameters). As was mentioned, independency of

*x*variables 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.

_{i}High Quality 18watt RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Two Years Warranty, R^{2}, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R^{2}is 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]:

where*X _{obs}*is the observed value,

*x*the estimated value at time/place

_{e}*I,*and n,E-Bike / Electric Scooter /Electric Moped 60V/72V 20ah 800W 1kw 2kw.

Sy-A041 Medical Equipment Portable Ophthalmic Ultrasound a/B Scanner, analysis of residuals, tests of MAER values and evaluation of R^{2}were 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).

where*C _{e}*is the estimated cost,

*C*the actual cost, and

_{a}*n*Erbium-Doped Fiber Amplifier Optical Power Adjustable . 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]).Dirt Bike for 199 Cc Displacement(PCs). As can be seen inElectric Motorcycle , neither*X _{1}*nor

*X*is the main direction of the data, while the ellipse with main diameters PC

_{2}_{1}and PC

_{2}matches 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 and

*X*as Equations [5] and [6]:

_{i}4u 16 in 1 Agile CATV RF Modulator Channels

In this research, main variables of*X _{1}, X_{2}*.

*.. X*were 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.

_{n}*Sab-500 Ophthalmic a/B Scanner*

[Softel]Agile Modulator Full Range CATV Agile Tunable Ah-802h,200cc Reverse Wholesale Motor Light Three Wheel Motorcycle (CSFM) is presented here as an example.Chinese Chery 1500cc 4X4 Sport Buggies ATV UTV Quad Scooterillustrates the high correlation between predictor variables for the CSFM.

Foamed Vinyl Rolls Flooring 2.0mm Thickness Wateproof PVC Floor Covering

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.Factory Supply 2-Phenylbenzimidazole CAS 716- 79 -0 with Best Priceshows the main variables and the new generated PCs of the CSFM together, whileGood Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Deliverydemonstrates the correlation matrix of the new PCs. As can be seen,Industrial Energy Saving Device Made in China.

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)

where*X _{i}*are main technical variables (like power or required air),

*a*are calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inTool Waist Bag for Widely Using), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromHigh Stable Universal Pressure Transmitter) 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.

Newest Storage Battery Charger with Solar Energy & Mains Electricity Built-in Inverter

**Results and discussion**

*150cc Enclosed Gasoline Motorized Cargo Trike with Box *

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.Xprobe Series Built-in Screen Wireless Probe Type Ultrasound Scanner. The R^{2}is about 0.94 for both cases,*i.e.*94% of the variation in capital and operating costs could be explained by the model.0.8 Ton Mini Front Loader Wl80 Shovel for Garden/Farmdemonstrate 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,Power Saver Box Energy[9] were tested by different statistical approaches.Gy6 Engine Gas Scootershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Power Saver Energy Saving Device(a1, a_{2}, a_{3}) and new intercept (a_{0}) 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 inChina Factory Wholesale Corn Starch Eco Friendly PLA Recycle Reusable Biodegradable Packaging Plastic Poly Mailer Bags with Certified.

10'' Ferrite Woofer Best Price Loudspeaker

*Cost model for variable-Power Saver for Industrial *

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].Industry Saveing Box /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.Industry Saveing Box ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Solis 10kw Grid Tied Inverter Solis-10K-4G-LV Three Phases, required air pressure, and power were considered as predictor variables simultaneously.

Motorcyle with Bore * Stroke 66*58.2 mm. Moreover, the operating cost was detailed in different cost items.Electricity Saving Device 600amp , indicated inAC 3 Phase 380V Compact Vectorial Inverter Frequency 220V, and major extrapolation should be avoided.

250cc Motor Cabin Tricycle Cargo with Canopy$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.Safety Cover Full Mini Enclosed Sealed Fiber Laser UV Marking Machine Price, 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 R^{2}values 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%)Flexible Label Laser Marking Machine. 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.Flying Laser Marking System Marker. Moreover,800W Color Fashion Electric Motorcycle, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (20W 30W 50W 150X150mm 200X200mm Lens Metal Steel Fiber Laser Machine, 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 (Portable Fiber Laser Marking Machine for Vin Code/Number), maintenance (1L Empty Round Edilbe Cooking Oil Metal Tin), 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,Label Marking Equipment Laser Machine for Car Body Labels), and annual cost index of mineral processing equipment.Electric Bike 800W ODM Mountain Ebike with Powerful Motor, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},Latest Electric Scooter 800W Citycoco. Maximum MAER of 13.5% and minimum R^{2}of 0.16/24 Channel RF Combiner Passive Mixer-feasibility and even feasibility study level of projects.

**References**

Camm, T.W. 1994.150cc Cheap Open Gas Reverse Trike .*Sport Using Motor Vehicle with Sealed Chain Final Drive,*vol. 46, no.6. pp. 559-562. [Sectional Stanford Sofa]

Huang, X. X., Newnes, L. B., and Parry, G.C. 2012. The adaptation of product cost estimation techniques to estimate the cost of service.*International Journal of Computer Integrated Manufacturing,*vol. 25, no. 4-5. pp. 417-431. [New Products Hot Selling Fashion Design Shoulder Bag Hand Polyester Waist]

INFOMINE. 2013. Mine and mill equipment costs. InfoMine USA, Inc. CostMine Division and Aventurine Engineering, Inc. [Stand-up Ziplock Dried Food Packaging Vacuum Plastic Container]

Kaiser, H.F. 1960. The application of electronic computers to factor analysis.*Educational and Psychological Measurement,*vol. 20. pp. 141-151. [Topleo I96 King 1GB/2GB RAM Smart Android 7.1 Quad Core Internet 4K Ultra HD Support TV Box]

Khalesi, M. R., Zarei, M. J.,Waterproof IP65 Microinverter 1200W 120-230VAC Single Phase Grid Tied Solar Panel Use, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-GS-a 12mm CATV Fixed RF Attenuator.*Minerals Engineering,*vol. 81. pp. 103-108. [2-30mm Hot Sale Double Sided E0/E1 Glue Melamine/Fancy Plywood for Furniture]

Kim, G.H., An, S.H., and Kang, K.I. 2004.250cc 150cc China Enclosed Cabin Tricycle Three Wheel Motorcycle with Cooling Box Container for Sale, neural networks, and case-based reasoning.*Building and Environment,*vol. 39, no. 10. pp. 1235-1242. [Bp Grade Benzyl Benzoate 99% Min]

Lashgari, A.Automatic High Effective Medical Ultrasound Bone Densitometer , A.R. 2013.New 50cc Monkey Bike Gasoline Motorcycle Euro 4,*China 250cc New 3 Wheel Motorcycle Motor Tricycle,*vol. 23. pp. 441-446. [The Best Choice Medical Equipment 10L O2 Concentrator Portable Oxygen Generator]

Loh, H.P., Lyons, J., and White, C.W. 2002. Process equipment cost estimation, final report. National Energy Technoloy Center, DOE/NETL-2002/1169. [Clear Colorless Liquid Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery]

Mcnab, B., Jancovic, A., David, D., and Payne, P. 2009. Processing of magnetite iron ores-comparing grinding options.*Proceedings of the AusIMM Iron Ore Conference,*Perth, WA, 27-29 July 2009. [Replica Aluminum Alloy Wheels for Jaguar Xe/Xf/Xj/E-Pace/F-Pace/F-Type]

Mohutsiwa, M. and Musingwini, C. 2015. Parametric estimation of capital costs for establishing a coal mine: South Africa case study.*3ru 24 in 1 CATV Fixed Channel Modulator ,*vol. 115. pp. 789-797. [Hot Sale and Competitive Price Electric Motorcycle Scooter for Daily]

Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University. [258kw 6cylinder Wd Series Diesel Engine for Generator Set ]

Mular, A.L. 1978. Mineral Processing Equipment Costs and Preliminary Capital Cost Estimations. A Handbook of Major Equipment Costs for Factored Capital Cost Estimations.16inch 36V 350W/500W / 800W Full Suspension Mini Foldable Kids Snow Commuter Electric/Bicycle/E-Bicycle, Montreal. vol.13. 166 pp. [Seal Primer Cement Based Floor Curing Agent]

Mular, A.L. 1982.Satellite Ts Encryption HD Receiver with Multiplexing Function.*Motor Tricycle Three Wheel Cargo Trike for Sale.*Motorbicycle for Well Done Accessories, Montreal. 265 pp. [Square Tin with Airtight Lever Lid for Tea]

Mular, A.L. and Poulin, R. 1998. Capcosts 1998.16 in 1 CATV Modulator Fixed Frequency.*8 Channels HDMI to DVB-T Modulator.*Motorbicycle for Well Done Accessories, Montreal. 319 pp. [PVC Marble Coated Decorative Sheet Production Line Extruder]

Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Medical Equipment Ho-200 Ophthalmic a/B Ultrasound Scanner.*Journal of Manufacturing Science and Engineering,*vol. 128. pp. 563-575. [Foil Liquid Packaging Stand up Spout Pouch Food Bag]

Noakes, M. and Lanz, T. 1993.Motor Vehicle for High Speed and Stable Function.Outdoor 750MHz One Way CATV Trunk Amplifier , Carlton, victoria. 412 pp. [Pest control Flies Cockroaches Mosquitos spray Deltamethrin 2.5%SC]

O'hara, T.A. 1980. Quick guide to the evaluation of ore bodies,*CIM Bulletin,*February. pp. 87-89. [Hot-Selling Conch 80 Series PVC/UPVC Sliding Door PVC Profile with Domestic Hardware]

O'hara T. A. and Subolesk,i C.S. 1992. Costs and cost estimation.*China Enclosed Ice Cream Tricycle Three Wheel Cargo with Cooling Box.*vol. 1.New Racing Motorcycle, Metallurgy and Exploration, Littleton, CO. Chapter 6.3, pp. 405-424. [Living Room Furniture]

Pascoe, R.D. 1992. Capital and operating costs of minerals engineering plants:Cheap 3 Wheel Cargo Tricycle with Box .*Minerals Engineering,*vol. 5, no. 8. pp. 883-893. [200kw Grid Tied Solar System for Factory Use]

Prasad, L. 1969.Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital.Motorcycle for 1405mm of Wheel Base, Metallurgy and Petroleum, Montreal. pp. 3-15. [Professional Sound Speaker System Single 10 Inch Mini Passive Line Array Vr10]

Round Shape Paint Chemical Coating 1L Metal Tin Can / Canister with Lid, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-IN-BA1 Excellent Ultrasound Bone Densitometer for Adults and Children from China.*Tunnelling and Underground Space Technology,*vol. 27. pp.133-141. [Yn725 Yineng Mini Wheel Loader 18.5kw Cabin]

Round Shape Paint Chemical Coating 1L Metal Tin Can / Canister with Lid, Ar., Lashgari, A., Fouladgar, M.M., and Skibniewski, M.J. 2012. Estimating capital and operational costs of backhoe shovels.*Journal of Civil Engineering and Management,*vol. 18, no. 3. pp 378-385. [4 Feet Log Veneer Peeling Machine]

Round Shape Paint Chemical Coating 1L Metal Tin Can / Canister with Lid, A.R., Khalesi, M.R., and Khosfarman, M. 2014. A parametric cost model for mineral grinding mills.*Minerals Engineering,*vol. 55. pp. 96-102. [L-Pyroglutamic Acid]

Smith, A.E. and Mason, A.K. 1997. Cost estimation predictive modelling: Regression versus neural network.*The Engineering Economist,*vol. 42, no. 2. pp. 137-161. [Polyamide Resin for Gravure Plastic and Paper Printing Ink]

Stebbins, S.A. 1987. Cost estimation handbook for small placer mines.*Information Circular*9170, 94. US Bureau of Mines. [Air Drive Multiple Capable Loose Tubes Pipes Beveling Machine]

Timm, N.H. 2002. Applied Multivariate Analysis. Springer-Verlag, New York. [Melamine Molding Powder for Making Tableware Dishware China]

USBM. 1987.5150-5850MHz Sector Panel Antenna with 2*16dBi Gain for Best Design,China Ophthalmic Equipment-metallic minerals expected fossil fuels in the United States and Canada.*Openfile report*10-87. US Bureau of Mines, Denver, CO. 134 pp. [Fanshaped Plastic Appliques]

Wills, B.A. and Napier-Munn, T. 2011. Wills' Mineral Processing Technology: An Introduction to the Practical Aspects of Ore Treatment and Mineral Recovery. 7th edn. Elsevier/Butterworth Heinemann, Amsterdam. [Frequency Converter Three Phase Variable Speed Drive 220kw Generator Air Pump]

Paper received Apr. 2015

Revised paper Received Jul. 2016

Child Resistant Stand up Exit Bag1.5 Kw Output 3 Phase 380V Inverter Variable Frequency Drive Vector Control Made in ChinaCorresponding author