27-02-2017   -   Nuclear

Sun 27 Feb 2017. New laser spectroscopy technique to understand atomic and nuclear structure of newly discovered radioactive atoms. The heavy actinide element actinium (Ac) was produced in a series of experiments using the particle accelerator at Louvain-la-Neuve, Belgium. The quickly decaying atoms of this element were captured in a gas chamber filled with Ar, sucked into a supersonic jet, and spotlighted with laser beams. By doing so, the outer electron in a different orbit is brought. A second laser beam then shoots the electron away. This ionizes the atom, meaning that it becomes positively charged and is now easy to manipulate and detect. The colour of the laser light is like a fingerprint of the atomic structure of the element and the structure of its nucleus. More

  30-01-2017   -   Physics

Mon 30 Jan 2017. Researchers have, for the first time, measured the lifetime of an excited state in the nucleus of an unstable element. This is a major step toward a nuclear clock that could keep even better time than today's best atomic timekeepers. Atomic clocks, the most precise chronometers we now have, are based on precise knowledge of the frequency of specific transitions between defined energy levels in the electron shells of certain atoms. Theoretical studies suggest that nuclear clocks that make use of analogous changes in the energy states of atomic nuclei could provide even more accurate frequency standards for timekeeping purposes. Research focused on the first experimental detection of a specific energy transition in the nucleus of a particular unstable isotope of the element thorium (Th-229), the only nucleus known to have the properties required for the development of a practical nuclear clock. More

  22-12-2016   -   Nuclear

Thu 22 Dec 2016. New technique for measuring radiation damage on the fly, thus continuously assess aging of materials in a high-radiation environment, such as nuclear reactor vessel, in real-time. The analytical method potentially allowing for continuous monitoring of these materials without the need to remove them from their radiation environment. This could greatly speed up the testing process and reduce the preventive replacement of materials that are in fact safe and usable. More

  04-12-2016   -   Chemistry

Sun 4 Dec 2016. The International Union of Pure and Applied Chemistry (IUPAC) has approved the name and symbols for four newly discovered elements: nihonium (Nh), moscovium (Mc), tennessine (Ts), and oganesson (Og), respectively for element 113, 115, 117, and 118. The exploration of new elements continues, and scientists are searching for elements beyond the seventh row of the periodic table. More

  13-11-2016   -   Energy

Sun 13 Nov 2017. An international team of scientists suggests that the world must ramp up energy production by nuclear power if we are to succeed in warding off the worst effects of greenhouse gas emissions on climate change. The team suggests that beginning in 2020 we could achieve an annual electricity output of 20 TW without needing to develop carbon dioxide trapping and storage technology for the tens of billions of tons of emissions that would otherwise drive global warming to catastrophic levels. Recent research suggests that it should be physically and economically plausible to multiply by a factor of fifty the production of nuclear energy by 2100, leading to a complete elimination of fossil fuels wherein 60% of electricity demand is met through nuclear and the remainder through sustainable technology. More

  09-11-2016   -   Nuclear

Wed 9 Nov 2016. Scientists propose technique to immobilize radioactive waste for millions of years by keeping it in glass. Researchers have searched ways to immobilize waste, particularly iodine-129, which has a half-life of 15.7 million years and can disperse rapidly in air and water, making it crucial for its safe storage and disposal in underground geological formations. The research may eventually lead to ways to safely dispose highly radioactive spent nuclear fuel, which is currently being stored at commercial nuclear power plants. More

  05-10-2016   -   Chemistry

Wed 5 Oct 2016. The Nobel Prize in Chemistry 2016 was awarded jointly to Jean-Pierre Sauvage, University of Strasbourg, France, Sir J. Fraser Stoddart, Northwestern University, USA and Bernard L. Feringa, University of Groningen, the Netherlands, "for the design and synthesis of molecular machines" More

  04-10-2016   -   Physics

Tue 4 Oct 2016. The Nobel Prize in Physics 2016 was divided, one half awarded to David J. Thouless, University of Washington, USA, the other half jointly to F. Duncan M. Haldane, Princeton University, USA and J. Michael Kosterlitz, Brown University, USA "for theoretical discoveries of topological phase transitions and topological phases of matter". More

  03-10-2016   -   Medicine

Mon 3 Oct 2016. The Nobel Prize in Physiology or Medicine 2016 was awarded to Japan's Yoshinori Ohsumi, Tokyo Institute of Technology, "for his discoveries of mechanisms for autophagy". More

  19-09-2016   -   Medicine

Mon 19 Sep 2016. New cyclotron used for fundamental and applied research in radiopharmaceutical chemistry. A new particle accelerator is further enhancing the research landscape. It will be used to generate isotopes with a short half-life, which are important for fundamental research but are also required for the medical imaging technique known as positron emission tomography (PET). As it is able to accelerate protons to an energy of 9.6 MeV, the cyclotron can be used to generate the two radioactive elements F-18 and C-11. These will be mainly employed for chemical and pharmaceutical research purposes but are also required for the PET medical diagnostic imaging technique. F-18 and C-11 have short half-lives of just 2 h and 20 min, respectively, which makes it necessary to generate them near the location at which they are to be used to ensure that they are available in sufficient quantities. More

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
 التالي