58 results found for physical

During the past century a number of chemical and physical risk factors for human cancers have been identified. Only relatively recently, mainly during the past 30 years, infectious agents have been identified as important human carcinogens. Besides....

Magnetic resonance imaging (MRI) is routinely used in hospitals to image internal structure and blood flow within the human body. Research has shown that it is possible to harness these techniques to study non-biological systems, with many applicatio....

Jonathan Christian discusses what it means to be a material/physical chemist. He shows how a physical chemist characterizes materials using his research into Chromium 3+ polyoxometalates.

Dr. Kroto analyzes the microwave spectrum of NCNCS

Dr. Kroto describes his ABC system for spectroscopy, a systematic method that can be applied to vibrational, rotational, and electronic spectrocopies

This talk is aimed primarily at young children and expresses my enthusiasm and my love for science. Its an attempt at expressing that Science is fun. I talk about some of the experiments done as part of my graduate work. Strategies for achieving guid....

For many problems involving multi-fracturing solids and/or particulate media, the system response is governed by the presence of an additional phase, either gaseous, liquid or both, or by the need to consider other physical phenomena, such as thermal....

Carbon nanotubes, some 1000 times smaller than conventional carbon fibers, have tensile strengths 100x that of steel and conduct electricity like metals. They promise a revolution in structural and electrical engineering.

In his lecture Professor Christian Rene de DuvŽ gives a rough overview on the history of life starting about 3.5 billion years ago with the first cells up to the appearance of the first primates 70 million years ago, and he states that all organisms....

For the discovery of the physics phenomenon of nuclear magnetic resonance (NMR), Felix Bloch and Edward Purcell were awarded the Nobel Prize in Physics in 1952. NMR has then been used in a wide range of fundamental studies in physics, and in the 1960....

Michael Garrett discusses the physical properties of gases and demonstrates how air is liquefied. Liquefied gases are a key resource for survival with an amazing range of applications and there are now few industries which are not in some way depende....

In part one of this three part series, FSU chemist Dr. Gregory Dudley, puts forth the controversy that surrounds microwave chemistry research, he outlines physical theory of microwave chemistry, and discusses the research teams central design hypothe....

Professor Ray Goldstein FRS is the Schlumberger Professor of Complex Physical Systems at the University of Cambridge. Here he describes a biological example of topological inversion, with relevance to engineering problems in human technology.

Some seeds of what to do in the climate/energy controversy are contained in what will be.  In this talk I shall ask everyone to jump over contemporary politics and make a mental journey to a time, several centuries from now, when nobody uses carbon-....

Dan Nocera of MIT gives a review of the world's current power demand and projects it forward to 2030. By using readily available data he shows that providing the increase needed is remarkably difficult given the need to restrict the production of ca....

Prof. C.N.R. Rao was born and brought up in Bangalore, India where he developed his interest in science. He studied for his Ph.D at Purdue University in the US but returned to India to continue his career. He has had numerous visiting positions abroa....

The importance of electron orbital angular momentum in the processes that contribute to resistivity.

Nuclear magnetic resonance (nmr), a powerful technique for determining molecular structure, has totally revolutionised chemistry. From its inception half a century ago, its potential as an analytical tool for identifying compounds was clear, albeit l....

Winner of the Nobel Prize in Chemistry 1992 'for his contributions to the theory of electron transfer reactions in chemical systems'. We ask Marcus to explain how he works and he replies that he draws pictures in order to visualize problems. On relig....

An introduction to acids and bases using simple kitchen equipment and some 'invisible ink'.

Solar power technology and recent research

John Murrell discusses the basic physical principles relating to the gaseous, liquid and solid states with the aid of models and demonstrations. Attention is drawn to phase changes and subtle features involving intermediate phases such as liquid crys....

As a student in the early 1960s, I had the privilege to attend winter seminars organized by my mentor, W. Hoppe, and by M. Perutz, which took place in a small guesthouse in the Bavarian-Austrian Alps. The entire community of a handful of protein cry....

Thin polymer films are doped with electrolytes to produce novel effects.

Abstract: 21st century chemistry is slowly expanding its concepts into the realm of supermolecular phenomena. However, few tools exist for explaining, creating and controlling complex macroscopic structures and dynamics. In this talk, I discuss our....

During the entire 20th century, physical sciences have advanced to such a degree that we can extrapolate how they can be applied, even in a fairly distant future.  Even if we leave open the (likely) possibility of spectacular new discoveries and inv....

Particle physics mainly developed after World War II. It has its roots in the first half of the previous century, when it became clear that all matter is made up from atoms, and the atoms in turn were found to contain a nucleus surrounded by electro....

Particle physics mainly developed after World War II. It has its roots in the first half of the previous century, when it became clear that all matter is made up from atoms, and the atoms in turn were found to contain a nucleus surrounded by electro....