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Free Webinar: Advanced Design of Multistage Centrifugal Compressor

SoftInWay announces a free webinar on advanced approaches to multistage centrifugal compressor design, to be held on Thursday, March 31, 2011, at 10 a.m. and 4 p.m. EST.

Multistage centrifugal compressors are widely used in gas pipeline systems and chemical industry. Defining optimal design parameters is critically important for saving energy at unit operation because these machines have high mass flow rate and significant total capacity.

Use Only the Angular Quantities in Analysis? Three Sample Problems to Consider...

A recent discussion at iMechanica following my last post here [^] leads to this post. The context of that discussion is assumed here.

I present here three sample problems, thought of almost at random, just to see how the suggestions made by Jaydeep in the above post work out.

Are Linear and Angular Momenta Interconvertible?

To the best of my knowledge, the two momentum conservation principles, namely, the conservation of linear- and angular-momentum, operate completely independent of each other. For an isolated object, there is no possibility of conversion of one form of momentum to the other.

Xuanhe Zhao's picture

Faculty Opportunity in Thermal Sciences/Energy Technology, Duke University

Faculty Opportunity in Thermal Sciences/Energy Technology, Department of Mechanical Engineering and Materials Science, Pratt School of Engineering, Duke University

A Different Kind of a Book Involving Electromagnetism and Potential Theory

Unlike other blog-posts of mine, I am not going "own" this particular thread. By that, I mean to say: I am going to only begin this thread and immediately turn it over to you completely. I am not going to watch over whether the discussion here continues to stick to its main theme or not, whether it slides into some minor side issues, whether it deserts the main theme altogether, etc., the way I usually do.

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The Meaning of the Concept of Potential in Mechanics (and in Physics)

If someone knows of books/articles dealing with the meaning of the concept of potential in physics (or concerning the physical bases underlying the energy methods of mechanics) then I would very much appreciate getting to know about these.

jintting's picture

Strain Energy Derivation

Dear Sirs,

I'm trying to derive an strain energy in a small volume 2a x 2b x 2t.

I can derive "The rest terms are ommited" by myself . 

By the way, I can't derive the DT2 term in the 2nd row of the figure.

Please help with reference or tips.


Jin Kim

Taxonomy upgrade extras: 

Mechanism To Increase Energy Efficiency.

View the figure attached. It is about using Cam for increase
energy efficiency. Cam are generally used to open and close valve of IC
Engine. I am going to show you another use. Left side initial position.
Right side final position. Redius of cam continuously decrease.Sliding
weight (MG) applied on Cam. With the help of rope weight(MG*Cos(b)) is
fixed with cam. We consider b as 45. So cos 45=.70. This fixed weight
should be 0.70 MG. Which balance the sliding weight applied on cam in
tengential direction. As sliding weight come down the fixed weight go
up. But the twist is the redius of cam decrease nominal continuously.
So sliding weight come down little bit and fixed weight go up much
more. We consider sliding weight come dowm H2 height and fixed weight

Mike Ciavarella's picture

Schwarzenegger, Obama, and Energy-related position at the White House

July 13, 2008, 7:31 pm

Schwarzenegger Says He Would Accept Obama Appointment

Melanie Trottman reports on the presidential race.

Guests on the Sunday newsmaker shows, including California Gov. Arnold Schwarzenegger and John McCain adviser Carly Fiorina, spotlighted energy and the economy and paid tribute to former White House press secretary Tony Snow.

Xi Chen's picture

Two faculty positions in computational and experimental mechanics at Columbia University

Columbia University
Department of Civil Engineering and Engineering Mechanics

The Department of Civil Engineering and Engineering Mechanics invites applications for TWO tenure-track faculty positions to support a Department initiative in Sustainable Engineering. Qualified individuals are sought with expertise in either:

(1) Computational mechanics - with an emphasis on large-scale computing applied to multi-scale, multi-phase modeling of materials (from nano- to macro-scale), and/or mechanics and materials challenges in energy and/or the environment.

Investing in Alternative Energy

Please note the website and bookings page for the 2nd Investing in Alternative Energy event 1 February 2008, IMechE can be found at:

The official brochure will be available shortly.

Further information

ycs's picture

Faculty Position in the Area of ENERGY at National Taipei University of Technology, Taiwan

The Department of Energy and Refrigerating Air-Conditioning Engineering at National Taipei University of Technology (NTUT) invites applications for one tenure-track faculty position in the area of ENERGY. Ph.D. in engineering is required. The position starts on August 1, 2007. Duties include teaching and research. The due day for application is on March 1, 2007.

Terra Preta Soil Technology

Please look at this low cost alternative CO2 Sequestration system.The integrated energy strategy offered by Terra Preta Soil technology may
provide the only path to sustain our agricultural and fossil fueled power
structure without climate degradation, other than nuclear power.

I feel we should push for this Terra Preta Soils CO2 sequestration strategy as not only a global warming remedy for the first world, but to solve fertilization and transport issues for the third world. This information needs to be shared with all the state programs.
The economics look good, and truly great if we had CO2 cap & trade in place: 
These are processes where you can have your Bio-fuel and fertility too.Terra Preta' soils I feel has great possibilities to revolutionize sustainable agriculture into a major CO2 sequestration strategy.

Virginia Polytechnic Institute & State University Faculty Positions

The Department of Engineering Science and Mechanics (ESM) at Virginia Tech seeks applications for two tenured or tenure-track faculty colleagues. The ideal candidates are expected to interface mechanics with the domain of biology (cellular mechanics, soft tissue biomechanics, macro-molecular biology, biodynamics, biofluids); the domains of nanotechnology or nanobiotechnology (mechanics of self-assembly, nanocomposites, functional nanodevices, biological and biomedical applications); or the domain of energy, with an emphasis on nanoscale and microscale problems or biological principles (fuel cells, renewable energy, energy conversion, clean energy, energy storage). However, intellectual depth is more important than the specific area of specialization, since ESM faculty members are expected to have a broad scholarly interest in engineering with a special emphasis on the fundamental mechanics.


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