SU(3) Flux Tubes in a Model of the stochastic Vacuum

We calculate the squared gluon field strengths of a heavy q-$\rm \bar{q}$-pair in the model of the stochastic vacuum. We observe that with increasing separation a chromoelectric flux tube is built. The properties of the emerging flux tube are investigated.Comment: 14, epsf, HD-THEP-94-3

Confining QCD Strings, Casimir Scaling, and a Euclidean Approach to High-Energy Scattering

We compute the chromo-field distributions of static color-dipoles in the fundamental and adjoint representation of SU(Nc) in the loop-loop correlation model and find Casimir scaling in agreement with recent lattice results. Our model combines perturbative gluon exchange with the non-perturbative stochastic vacuum model which leads to confinement of the color-charges in the dipole via a string of color-fields. We compute the energy stored in the confining string and use low-energy theorems to show consistency with the static quark-antiquark potential. We generalize Meggiolaro's analytic continuation from parton-parton to gauge-invariant dipole-dipole scattering and obtain a Euclidean approach to high-energy scattering that allows us in principle to calculate S-matrix elements directly in lattice simulations of QCD. We apply this approach and compute the S-matrix element for high-energy dipole-dipole scattering with the presented Euclidean loop-loop correlation model. The result confirms the analytic continuation of the gluon field strength correlator used in all earlier applications of the stochastic vacuum model to high-energy scattering.Comment: 65 pages, 13 figures, extended and revised version to be published in Phys. Rev. D (results unchanged, 2 new figures, 1 new table, additional discussions in Sec.2.3 and Sec.5, new appendix on the non-Abelian Stokes theorem, old Appendix A -> Sec.3, several references added

Bulletin of the California Polytechnic School 1933-34

Identification of peptides that can bind to major histocompatibility complex (MHC) molecules is important for anticipation of T-cell epitopes and for the design of epitope-based vaccines. Population coverage of epitope vaccines is, however, compromised by the extreme polymorphism of MHC molecules, which is in fact the basis for their differential peptide binding. Therefore, grouping of MHC molecules into supertypes according to peptide-binding specificity is relevant for optimizing the composition of epitope-based vaccines. Despite the fact that the peptide-binding specificity of MHC molecules is linked to their specific amino acid sequences, it is unclear how amino sequence differences correlate with peptide-binding specificities. In this chapter, we detail a method for defining MHC supertypes based on the analysis and subsequent clustering of their peptide-binding repertoires

Moving Towards Self-Reliance: Living Conditions of Refugee Camps in Lebanon and Opportunities for Development

Refugee camps in Lebanon are harsh, continuously and rapidly deteriorating environments. In addition to poverty, numerous wars and the restrictions of civil rights, refugee camps that were not designed as a long-term settlement were made to accommodate their residents in addition to their descendents for a period that has lasted over 59 years. Since the establishment of the camps in 1948 the Palestinian refugees in Lebanon have fallen victim to multiple wars and as a result most camps have witnessed major destruction of homes and infrastructure, and a few were entirely destroyed. Today, the planning and development of the camps are highly restricted by the local government, building material is banned from entering the camps and horizontal as well as vertical expansion is prohibited by Lebanese law. According to the United Nations Relief and Work Agency (UNRWA) the hundreds of thousands of Palestinian refugees in Lebanon have the highest rate of people living in abject poverty in the Middle East. Meanwhile, the refugee community and the international aid agencies working in the camps are caught in the dilemma of investing in the development of a sustainable environment in a settlement with a temporary purpose and an uncertain future. This thesis explores the problems facing the built-environment in the camps within the political and socio-economic context, and takes the camp of Burj El Barajneh as a case study for deeper investigation. It then suggests three possible solution approaches that address the environmental problems within different future scenarios. The thesis also looks at the feasibility and requirements of an energy generation plant to provide part of the energy needs of the camp of Burj El Barjneh. Finally, a set of conclusions and recommendations are derived that address the refugee community, the international aid agencies and the host country. The significance of this study is to mitigate a possible humanitarian and environmental crisis in the most dire of refugee situations in the Middle East, with the hope that conclusions drawn from this study can be applied to refugee communities elsewhere in the region