Nature recently favorably reviewed a new self-published book, based on a blog , by a "female physical sciences professor" in the US. While the overarching theme is clearly about being a female in a male-dominated world, the writings on the blog (and in the book) are in many places general and provide lots of good advice and anecdotes about acadmic life. The
Hi all, i am the final semester student in.Struc Mecha.For my final
project i have to model combine sheet pile with FEM. i used ansys for
set up the model. Combination of AZ,HZ n RZ profile were developed
sheet pile. In my modelling i applied frictional contact to define all
the connection between two parts. When i run my calculation, it does
not converged when body get contact. I was applied spring and small
load step in set up.but still does not work too..if anybody have any
Recently, more and more trash ADs appear at imechanica. The users like "ORDER CIALIS ONLINE - US DRUGSTORE FDA" have added the ADs at the comments. Is there any good method for us to prevent such behavior at imechanica? As one of the moderator, may I have the right to directly give such users name to system operator to prevent these trash ADs?
This morning I was looking at the book Mechatronic Reliability by Wei Yang. The forword I wrote for the book brought back memories of days he and I spent in Santa Barbara and Princeton. The text of the forword follows.
Recent events about the financial crisis and generally spread turmoils on Economics and Financial Environments lead me to these conclusions.
Critical Speed: informations, a key issue on finance, reached a critical speed. Maybe this is the "first" critical speed of the system. Speed of informations has reached the same order of magnitude of people's judgement (executives and investors more than others) so there's a sort of over-reaction about actual events.
The number of registered users of iMechanica reached 9000 on 13 October 2008, after two years and one month since the website launch. The total number of posts is 4036, the total number of comments is 8888, and the total web hits is estimated to be more than 30,000,000.
Most of you have heard about the commissioning of the Large Hadron Colider (LHC) by CERN and then the explosion of Helium followed by a postponement of operation until spring next year. One of the worries some people had was that a mini black hole would be created by the collsions. Also, the anthropic principle in one of its forms suggests that every possible universe exists but we see only our universe because it's the one in which intelligent observers exist.
I've mostly had quite helpful responses from iMechanica participants whenever I've asked questions on this forum. However, I've noticed that questions from several posters have gone unanswered. I feel that there are two main reasons for that lack of response:
1) The questioner has not provided an adequate details by which they can be identified. I generally don't like responding to a question posed by someone called xyz1983.
Remember when I spoke of the Easterlin paradox (a key concept in happiness economics postulated by Richard Easterlin in the 1974 paper "Does Economic Growth Improve the Human Lot? Some Empirical Evidence."[1]
It finds that, contrary to expectation, happiness at a national level
I was browsing the discussion page for Stress in Wikipedia when I came upon this interesting comment:
"
Refutation of Cauchy stress
The theory of stress based on Euler & Cauchy is now refuted. The profound incompatibility of this theory with the rest of physics, especially the theory of potentials and the theory of thermodynamics, has been documented in
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.
From thinking about the 'I'd Love to Change the World' discussion, I have concluded that my dilemma stems from the (basically) three career paths from which I can choose.
A teacher that can have a great deal of influence on a select number of other individuals' lives and can take great pride in helping others achieve their potential, and possibly make great contributions to society.
A scientist that can continue to explore the unexplained and hopefully discover something that could contribute to society.
There has been some discussion about the low ratio of replies to reads on iMechanica. While it's nice to think that a lot of people are reading our posts, I wonder how many of those 'reads' are really bots indexing the page. For example, I posted a blog entry last night around 11:00 and nine hours later it says it has been read 45 times. A couple of those can be attributed to me but I'm sure 40 real people have not read the post. Add to this the fact that the post is already showing up in Google.
i'm try to do a dynamic analysis by abaqus and i faced some problems.any help is appreciated.
The structure is a 3 layers plates,a viscoelastic material sandwich between 2 steels.i modeled the 2 steel as sheel 'S8R"and the rubber as contiuum "c3d20r",rubber is not thin. Now i don't know how to set the parameters requried by the Code.I hove some parameters abuout the viscoelastic material.,includeing shear storage modulus G(f)=exp(-2.69292)*f^(0.6937),and loss factor of the material L(f)=exp(0.60503)*f^(-0.08807), Possion ratio=0.49, where f is frequency in Hz.
I joined imechanica almost a year ago and I've been frequently following its interesting discussions, even the most animated ones. I think that a place like this is ideal to foster the exchange of ideas in the scientific community;
Moreover it is fantastic as a simple student like me can interact and easily ask questions to the most important researcher in the field of mechanics.
many researchers in industrial countries think the only problem of third world researchers is money but it is not true. I worked as a researcher for four years in one of this third world countries.
Computational and Theoretical research dont need much money as like as lab dependent research. because freeware and opensource became popular and (the copyright laws are not strict in these countries unfortunately).many experimental works also can be done with available facilities in these universities.
In Singapore, I have seen students who lost their relatives in last earthquake. I am very sorry about this, but I think there should be lessons for us in such disasters. Is'nt any cheap and easy way to reinforce building in the face of earthquakes? I hope such disasters make researchers concentrate on such important topics.
The research funding environment we are all experiencing is extremely frustrating, and has the potential for long-term damage to academics and the nation. You may be interested in reading the letter to the Wall Street Journal by two Nobel Prize winners, David Baltimore and Ahmed Zewail.
Recent comments