This research group is created with an intention of making an interaction among the research scholars, professors, scientists, engineers & technologists working in the field of Engineering, so that today’s novel ideas can become reality of tomorrow and these all can be implemented in a more constructive manner for the welfare of whole mankind

• Faiz M. Mahdi

  The effect of Sedimentation during vacuum filtration?

  I am trying to measured the exact material permeability of different conditions including size, concentration and shape of particles. i have problem with sedimentation during filtration that effectI am trying to measured the exact material permeability of different conditions including size, concentration and shape of particles. i have problem with sedimentation during filtration that effect cake concentration and resistance and then the final solid permeability results. is there any one understand this behavior and know a good way to count it in the calculation. Regards Faiz

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    Paulo Sergio Scalize replied

    My English is not the best to explain the methodology. Search in the Standard Methods, testing the resistance to filtration.

    3 days ago
• Artem Sychev

  Is there a difference between making air flow by evacuating it and by pumping it?

  I'm currently working on a test rig that will simulate the flow of air through a cylinder of an internal combustion engine during the intake process. I have a prototype that utilizes a vacuum vesselI'm currently working on a test rig that will simulate the flow of air through a cylinder of an internal combustion engine during the intake process. I have a prototype that utilizes a vacuum vessel to imitate the pressure drop caused by piston movement. However, I'm not sure if the character of the flow will change if we pump the air into the cylinder instead. In both cases the air enters the cylinder through the inlet valve and leaves through a perforated plate at the bottom. So, the question is - can suction be replaced with pumping without the change in flow pattern? The question arose because the pumping variant is much easier to set up.

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    Murilo Luciano Filho replied

    My view is that pull work will be not exactly real specially facing atmospheric pressure. Pushing, or positive pressure, is much more near to combustion piston behavior. The behavior of air inMy view is that pull work will be not exactly real specially facing atmospheric pressure. Pushing, or positive pressure, is much more near to combustion piston behavior. The behavior of air in negative system is completely different from +'s.

    3 days ago
• Prachi Jhanwar

  What is the best suited material for fabrication of ohmic contact switches?

  The major cause of the failure of ohmic contact switches is the contact material ,so what material should be preferred for this purpose.

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    Himadri Pandey replied

    Well, I would say it depends upon your application. If you're working on low power requirements, switching, sensing or actuation, medical technology, etc., I'd refer you to opt for Au/Ni micro-pads,Well, I would say it depends upon your application. If you're working on low power requirements, switching, sensing or actuation, medical technology, etc., I'd refer you to opt for Au/Ni micro-pads, as we do in case of MEMS micro switches, specially when the usage involves RF applications or blood environment (corrosive) applications. If you're having high power applications, then I'd recommend you to opt for High Quality Silicon Carbide based switches. I hope this helps.

    4 days ago
• Himanshu Chandarana

  How to calculate the power for a stone crusher which parameter to fix can't get it please follow the link if anyone has answer

  Power required for other diametrical calculations

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    Mukesh Dabhi replied

    It is required to know about the strength of the stone to be crushed and accordingly size of the original stone as well as crushed stone affect the power requirement. There is an equation for sizeIt is required to know about the strength of the stone to be crushed and accordingly size of the original stone as well as crushed stone affect the power requirement. There is an equation for size reduction. E = K × ΔS where E = energy required for size reduction, K = specific surface coefficient, and ΔS = newly created surface area. The energy, E, and specific surface coefficient, K, have a high dependence on physical properties of the materials to be ground and the operational parameters of the crusherl. The physical properties include hardness and weight. The crusher operational parameters are feed rate, crusher size and surface corrugations, grinding action, gap, and speed.

    5 days ago
• Rohith Kumar P

  For a thermocouple, what should be the temperature gradient to generate a voltage of about 5 to 6 volts?

  ...

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    Byron Wooldridge replied

    A firm called ThermoElectron used to manufacture power systems for remote gas pipeline instrumentation applications that made power sources for those metering stations that burned a little bit of gasA firm called ThermoElectron used to manufacture power systems for remote gas pipeline instrumentation applications that made power sources for those metering stations that burned a little bit of gas and generated power to run the instruments using thermocouples. You might check the Internet to see if they are still in business. They may be able to answer your questions.

    6 days ago
• Rezvan Barzegar

  Software cost estimation

  Is there anyone who could recommend a book for the topic "software cost estimation"?

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    Mel Jennings replied

    Cost = ((prototype time+ time to deliver ) * # of team members) * average hourly cost (not salary) Or 1 line of code cost $100 (USD) None of these are a perfect estimator deadlines and dates workCost = ((prototype time+ time to deliver ) * # of team members) * average hourly cost (not salary) Or 1 line of code cost $100 (USD) None of these are a perfect estimator deadlines and dates work better JMO 37 years of development experience.

    10 days ago
• Avik Kumar Saha

  What is the relation between response time & damping in SMART transmitters?

  Response time of SMART trasmitter = dead time + time constant. Please refer to the link

  http://www2.emersonprocess.com/siteadmincenter/PM%20Rosemount%20Documents/00813-0100-4001.pdf
• Adrian Danilo Arpi

  The HART (Hardware Access in Real-Time) Toolbox can be used to generate Scicos-blocks for hardware that have a C/C++ interface. The blocks can be used under Linux for soft and hard real time tasksThe HART (Hardware Access in Real-Time) Toolbox can be used to generate Scicos-blocks for hardware that have a C/C++ interface. The blocks can be used under Linux for soft and hard real time tasks (RTAI). Blocks are provided for DAQ (COMEDI)

  http://hart.sourceforge.net

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    Diego Cabrera replied

    For hard real time task is absolutely necessary generate a low level code in C language and execute without scicos within kernel rtai. Is not possible execute hard rt task in enviroment of scicosFor hard real time task is absolutely necessary generate a low level code in C language and execute without scicos within kernel rtai. Is not possible execute hard rt task in enviroment of scicos but soft rt task is possible. The stable version to rtai of Ubuntu is 10.04.

    24 days ago
• Noha Salem

  New from Google: Focused Research Grants

  Especially for Middle East and North Africa researchers For more information, please visit: http://research.google.com/university/relations/focused_research_awards.html and for other questionsEspecially for Middle East and North Africa researchers For more information, please visit: http://research.google.com/university/relations/focused_research_awards.html and for other questions on applying, please contact me directly Noha Salem Google University Relations Manager Middle East & North Africa

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    Bilal Bahaa replied

    Dear NOha, I searched and I could not find any application form? Would you please elaborate more about this post!

    27 days ago
• Elango Mani

  Comment and give suggestion on Flywheel energy storage for lab experiment

  There are two scenarios we are considering: The first is power the AC motor through mains and then feed the regeneative current back into the building mains (grid-tie system with 230 or 440 V mains).There are two scenarios we are considering: The first is power the AC motor through mains and then feed the regeneative current back into the building mains (grid-tie system with 230 or 440 V mains). The second is to use an intermediary battery bank to provide power for the motor controller, and then feed the regenerative energy back into the battery bank (possibly using a grid-tie inverter to go into 230 or 440V mains). We need to be able to remotely control and receive data from your device through our own proprietary software. The user should be able to drive the motor at specified speeds/torques and also to command a regen operation to take energy from the motor and put it back into an electrical form.

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    Narendra Nath replied

    Contact DR. Y.K. Vijay, Head, Instrumentation & Development Centre, University of Rajasthan, Jaipur -302004, India and or use Mobile Telephone link 9461302757 in India. He has developed differentContact DR. Y.K. Vijay, Head, Instrumentation & Development Centre, University of Rajasthan, Jaipur -302004, India and or use Mobile Telephone link 9461302757 in India. He has developed different kinds of Fly wheel machines

    29 days ago
• Mrs. Sarika Patil

  Can anybody help me in simulating Multilevel inverter for minimization of Harmonics?

  Optimization of angle for 5th & 7th Harmonicselimination using Newton Raphson Method / Partical swarm method/ Bee Algorithm/ Genetic Algorithm

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    Yahya Naderi replied

    I think it's possible to eliminate or reduce THD of multilevel inverters with a little knowledge of programming and deriving the Fourier Transform of the Voltage or current (the one you need ) andI think it's possible to eliminate or reduce THD of multilevel inverters with a little knowledge of programming and deriving the Fourier Transform of the Voltage or current (the one you need ) and then controlling the switching strategy by the means of various PWM methods. wish you good luck

    Apr 28, 2012
• Jonathan Allen

  Why not use wound-field motors and generators to overcome rare elements shortage?

  There is a big ruckus now about the shortage of rare earth elements for the permanent magnet fields in motors and generators. At least in the case of large ones, why does the industry rejectThere is a big ruckus now about the shortage of rare earth elements for the permanent magnet fields in motors and generators. At least in the case of large ones, why does the industry reject wound-field designs? They are a mature and proven technology. While the field windings do use a small amount of power, they allow for additional control by adjusting the field current.

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    Robert Colombo replied

    The problem with Tesla motors is constant burn-out due to the poor management of complex harmonics from the combination of VFDs and electronic accelerator control. We are currently working on aThe problem with Tesla motors is constant burn-out due to the poor management of complex harmonics from the combination of VFDs and electronic accelerator control. We are currently working on a solution we use in industry to fix electric drive vehicles

    Apr 27, 2012
• Thomas Frumkin

  What incentives can be easily created to encourage thoughtful energy conservation and interest in renewable energy?

  I believe there are many things each person can do to save energy. These include turning lights off in rooms that are not being used, hanging clothes outside to dry, learning how to cook instead ofI believe there are many things each person can do to save energy. These include turning lights off in rooms that are not being used, hanging clothes outside to dry, learning how to cook instead of using petroleum to go to wasteful restaurants, using blankets in winter, waiting longer to turn on air conditioning, I could go on for a long time. What I'm trying to find out are what sort of incentives can be offered to encourage people to become more energy conscious. The goals for the incentives need to be able to be easily reached, and easily distributed.

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    Thomas Frumkin replied

    Thank you very much! This is very helpful. Others be advised not to the include the parenthesis. It will give you a dead link.

    Apr 26, 2012
• Yong Kuen Ho

  Data extraction tool

  Does anybody know any good software for extracting data from figures and plots?

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    Yong Kuen Ho replied

    Thank you guys... was looking for one that I do not have to use the internet..

    Apr 24, 2012
• Aviti Mushi

  PI controller tuning without Ziegler-Nichols methods

  Hello, I need help of how to do PI controller tuning for a first order system without resorting to the measurements of the plant as in Nichols-Ziegler methods or the use of MATLAB graphs. I amHello, I need help of how to do PI controller tuning for a first order system without resorting to the measurements of the plant as in Nichols-Ziegler methods or the use of MATLAB graphs. I am modelling a permanent magnet motor drive and have a problem with trial and error methods which some of my colleagues are suggesting to me. I want to compute the Ki and Kp from the motor parameters such as R and L. I saw one video about doing this using root locus, but I tried it several times and I get a poor/slow settling time. Any help please!!

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    Aviti Mushi replied

    Romero, it worked. The method you suggested and the other methods like Internal model control, and pole placement by designing the damping ratio. It was a well deserving contribution from you whichRomero, it worked. The method you suggested and the other methods like Internal model control, and pole placement by designing the damping ratio. It was a well deserving contribution from you which got me started in getting it easily done for the first order systems. I think for higher orders, I can as well use the same with small modifications to handle the added poles. Thank you.

    Apr 24, 2012