A novel approach for quality control system using sensor fusion of infrared and visual image processing for laser sealing of food containers

This paper presents a new mechatronic approach of using infrared thermography combined with image processing for the quality control of a laser sealing process for food containers. The suggested approach uses an on-line infrared system to assess the heat distribution within the container seal in order to guarantee the integrity of the process. Visual image processing is then used for quality assurance to guarantee optimum sealing. The results described in this paper show examples of the capability of the condition monitoring system to detect faults in the sealing process. The results found indicate that the suggested approach could form an effective quality control and assurance system

Electronic states and optical properties of PbSe nanorods and nanowires

A theory of the electronic structure and excitonic absorption spectra of PbS and PbSe nanowires and nanorods in the framework of a four-band effective mass model is presented. Calculations conducted for PbSe show that dielectric contrast dramatically strengthens the exciton binding in narrow nanowires and nanorods. However, the self-interaction energies of the electron and hole nearly cancel the Coulomb binding, and as a result the optical absorption spectra are practically unaffected by the strong dielectric contrast between PbSe and the surrounding medium. Measurements of the size-dependent absorption spectra of colloidal PbSe nanorods are also presented. Using room-temperature energy-band parameters extracted from the optical spectra of spherical PbSe nanocrystals, the theory provides good quantitative agreement with the measured spectra.Comment: 35 pages, 12 figure

Zeta potential in oil-water-carbonate systems and its impact on oil recovery during controlled salinity water-flooding

Jackson was funded by the TOTAL Chairs Programme at Imperial College London, and Vinogradov through the TOTAL Laboratory for Reservoir Physics at Imperial College London.Peer reviewedPublisher PD

Unpacking cyberterrorism discourse: Specificity, status, and scale in news media constructions of threat

This article explores original empirical findings from a research project investigating representations of cyberterrorism in the international news media. Drawing on a sample of 535 items published by 31 outlets between 2008 and 2013, it focuses on four questions. First, how individuated a presence is cyberterrorism given within news media coverage? Second, how significant a threat is cyberterrorism deemed to pose? Third, how is the identity of ‘cyberterrorists’ portrayed? And, fourth, who or what is identified as the referent – that which is threatened – within this coverage? The article argues that constructions of specificity, status and scale play an important, yet hitherto under-explored, role within articulations of concern about the threat posed by cyberterrorism. Moreover, unpacking news coverage of cyberterrorism in this way leads to a more variegated picture than that of the vague and hyperbolic media discourse often identified by critics. The article concludes by pointing to several promising future research agendas to build on this work

Source partitioning using stable isotopes: coping with too much variation.

Final published version of the article deposited in accordance with SHERPA RoMEO guidelinesStable isotope analysis is increasingly being utilised across broad areas of ecology and biology. Key to much of this work is the use of mixing models to estimate the proportion of sources contributing to a mixture such as in diet estimation

Quadrupole collective modes in trapped finite-temperature Bose-Einstein condensates

Finite temperature simulations are used to study quadrupole excitations of a trapped Bose-Einstein condensate. We focus specifically on the m=0 mode, where a long-standing theoretical problem has been to account for an anomalous variation of the mode frequency with temperature. We explain this behavior in terms of the excitation of two separate modes, corresponding to coupled motion of the condensate and thermal cloud. The relative amplitudes of the modes depends sensitively on the temperature and on the frequency of the harmonic drive used to excite them. Good agreement with experiment is found for appropriate drive frequencies.Comment: 4 pages, 3 figure

Bose-Einstein condensates with attractive interactions on a ring

Considering an effectively attractive quasi-one-dimensional Bose-Einstein condensate of atoms confined in a toroidal trap, we find that the system undergoes a phase transition from a uniform to a localized state, as the magnitude of the coupling constant increases. Both the mean-field approximation, as well as a diagonalization scheme are used to attack the problem.Comment: 4 pages, 4 ps figures, RevTex, typographic errors correcte