[en] Lattice parameter, particle size, and thermal expansion results obtained from high-temperature synchrotron transmission X-ray diffraction are reported for magnetostructual NiAs-type MnBi nanorods embedded in a Bi matrix. The structural data are consistent with elevated-temperature magnetic measurements that indicate a first-order nanorod Curie transition at 520 K, significantly depressed from the bulk MnBi Curie temperature of 633 K. The data suggest that the unit cell volume dependence of the magnetic behavior - also known as the volume exchange striction - of the MnBi compound is the determining factor underlying this phenomenon. The results imply that materials with magnetostructural transitions of technological interest may be altered by strain effects to tailor the interatomic distances towards the critical transition values.

[en] We study the ILC phenomenology of Kaluza-Klein (KK) modes along two universal extra dimensions compactified on the chiral square. We compute production cross sections of various (1, 0) particles at the ILC with (s)^1/2 = 1 TeV, focusing on decays of KK-leptons and the KK partner of the hypercharge gauge boson down to the 'spinless photon', which is the lightest KK particle. We contrast this model to one universal extra dimension with KK-photon (spin-1) and supersymmetry with neutralino (spin-1/2) or gravitino (spin-3/2) dark matter. We also investigate the discovery potential for (1, 1) KK bosons as s-channel resonances

[en] Singapore’s heavy reliance on imports to meet her peoples’ food requirements means the country is especially susceptible to food safety and food fraud related incidents. With food fraud concerns increasing globally due to the involvement of organised crime syndicates, systems that can independently assure the traceability of food along the supply chain in addition to current paper based approaches is becoming increasingly important. The setting up of a scientific traceability programme in Singapore using stable isotope and trace element concentration (SITE) measurements was demonstrated using dairy milk as an example matrix. 296 dairy milk samples from ten countries of origin were analysed over a period of two years. Differences in their isotope signatures and elemental content were found to be suitable to be used to differentiate them based on their country of production. (author)

[en] In the 4^th fiscal year, the performance of the system developed in previous year have been stablilized. An automatic mixer system to mix the liquid radioactive waste with the liquid scintillator was designed and manufactured to make continuous monitoring possible. Mechanical systems for the automatic transfer, injection of radioactive samples, and for sealing sample bottle and its attachment on detector system have been designed and developed for completely integrated system, The experimental has been performed for the radioactive analysis by using the system. The measured data are transferred to central computer, which controls the monitoring system, through the RS-232 communication protocol. A software for host personal computer was developed for the control and analysis of the integrated system

[en] This paper seeks to demonstrate that many of the existing mass-measurement variables proposed for hadron colliders (m_T, m_eff, m_T2, missing p-vector_T, h_T, √(s-circumflex)_min, etc.) are far more closely related to each other than is widely appreciated, and indeed can all be viewed as a common mass-bound specialized for a variety of purposes. A consequence of this is that one may understand better the strengths and weaknesses of each variable, and the circumstances in which each can be used to best effect. In order to achieve this, we find it necessary first to revisit the seemingly empty and infertile wilderness populated by the subscript 'T' (as in 'pe_T') in order to remind ourselves what this process of transversification actually means. We note that, far from being simple, transversification can mean quite different things to different people. Those readers who manage to battle through the barrage of transverse notation distinguishing 'T' from 'v' or or from 'o', and 'early projection' from 'late projection', will find their efforts rewarded towards the end of the paper with (i) a better understanding of how collider mass variables fit together, (ii) an appreciation of how these variables could be generalized to search for things more complicated than supersymmetry, (iii) will depart with an aversion to thoughtless or naieve use of the so-called 'transverse methods' of any of the popular computer Lorentz-vector libraries, and (iv) will take care in their subsequent papers to be explicit about which of the 61 identified variants of the 'transverse mass' they are employing.

[en] We have investigated atomic arrangements and their electronic properties of the well-ordered thallium overlayer structures formed on the Si(111)-7x7 surface. As for other trivalent atoms, Tl is found to form a well-defined √(3)x√(3) surface, indicating the absence of a so-called 'inert pair effect' considered only for Tl. Another well ordered 1x1 surface at 1.0 monolayer appears to be semiconducting in our angle-resolved photoemission spectra dominated by a unique dispersive surface band near the Fermi level. Our theoretical calculations using density-functional theory show that Tl adatoms occupy the T₄ sites and saturate all the dangling bonds of surface Si atoms to make the surface semiconducting with a band gap of 0.34 eV. The filled surface band observed has been well reproduced in our band calculations

[en] This study details the distribution and trends of doses of occupational radiation among diagnostic radiation workers by using the national dose registry between 1996 and 2006 by the Korea Food and Drug Administration. Dose measurements were collected quarterly by the use of thermoluminescent dosemeter personal monitors. A total of 61 732 workers were monitored, including 18 376 radiologic technologists (30%), 13 762 physicians (22%), 9858 dentists (16%) and 6114 dental hygienists (9.9%). The average annual effective doses of all monitored workers decreased from 1.75 to 0.80 mSv over the study period. Among all diagnostic radiation workers, radiologic technologists received both the highest effective and collective doses. Male radiologic technologists aged 30-49 y composed the majority of workers receiving more than 5 mSv in a quarter. More intensive monitoring of occupational radiation exposure and investigation into its health effects on diagnostic radiation workers are required in South Korea. (authors)