Monday, June 26, 2006

 

Does temperature exist at the nanoscale?

Surprisingly, whether temperature exists at small scales depends on what temperature you're talking about, a PRL paper showed (Highlighted by APS Physics Tip Sheet #44). It's a problem of definition. Are things meaningfully defined on nanometer length scales? We need to think about it. Generally speaking, all things defined in macroscopic, continuum or statistical theories need to be examined when it comes to small scales. And measurements are also concerned.
Physicists questioned about temperature. How about stress? Modulus? What are the stresses in, for example, carbon nanotubes and DNAs? Can we, and do we have proper ways to measure them in experiments? How to define the contact area in low dimensional(1-D, 2-D) systems? What do you think?

Tuesday, June 20, 2006

 

Microchip pushed to record operating speeds

This would be awesome if can be turned into commercial products:
http://www.newscientisttech.com/article/dn9368-microchip-pushed-to-record-operating-speeds.html

Monday, June 19, 2006

 

Inorganic Electronics Begin to Flex Their Muscle

http://www.sciencemag.org/cgi/reprint/312/5780/1593.pdf

In near future, mechanical engineer will do this kind of analysis in a mechanics point of view.

 

Researchers Reveal New Insights into the Surface of Silicon Semiconductors

http://www.physorg.com/news69693841.html

Saturday, June 17, 2006

 

MEMS applications using diamond thin films

Interesting!
http://sst.pennnet.com/Articles/Article_Display.cfm?Section=ARTCL&ARTICLE_ID=253400&VERSION_NUM=2&p=5

Wednesday, June 14, 2006

 

NIST Bullet Tests Make Frangibles More Tangible

http://www.nist.gov/public_affairs/techbeat/tb2006_0608.htm#bullet

This link is not related to our research. you can watch pretty interesting movies files (clip1 and clip2). Can we consider it as dynamics fracture?

Tuesday, June 13, 2006

 

DNA and carbon nanotube micromachines

One of recent APS Physics Tips Sheets put two interesting PRL papers together: one reports that DNAs turn rotation into translation, and the other tells carbon nanotubes turn translation into rotation. Click here and scroll down to see the tip.

Saturday, June 10, 2006

 

What is a Quartz Crystal Microbalance - QCM?

This article is about history and basic principles of QCM. QCM is a widely used sensor for measuring small mass and liquid phase properties etc.(Detailed applications are listed in the article.) This article helped me a lot in preparing my presentation in IEEE FCS.

http://www.pharmaceutical-int.com/categories/qcm-technology/what-is-a-quartz-crystal-microbalance-qcm.asp

Friday, June 09, 2006

 

Nanotechnology's Big Question: Safety

Very little is known about the safety risks presented by engineered nanomaterials. But it becomes a more and more important problem for researchers to explore right now:

http://www.washingtonpost.com/wp-dyn/content/article/2005/10/22/AR2005102200995.html

 

Introduction of Flip Chip

Flip chip package is the state of the art technology of microelectronics field due to electrical performance. But the increase of device density on the chip cause mechanical problem which I try to understand and solve. What is flip chip? This web site gives us brief introduction and tutorials. Click here for the introduction of flip chip. If you want to know more information, you can also see full toturials and photos etc.

Saturday, June 03, 2006

 

Plastic Deformation of Freestanding Thin Films

Plastic response of crystalline solids exhibit a strong size dependence on micro- and nano-scales. This is a good article on the experiments and modeling aspects for this issue:

http://www.deas.harvard.edu/vlassak_group/publications/42_fs27.pdf

Friday, June 02, 2006

 

Growing Glowing Nanowires to Light Up the Nanoworld-by NIST

This article is about one of applications of nanowire. Although the content is short, the photo is very interesting. Click here for short article.

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