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| 2. |
- Miguez-Burbano, M. J., et al.
(författare)
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Continued high risk behaviors in HIV infected drug abusers
- 2002
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Ingår i: Journal of Addictive Diseases. - 1055-0887 .- 1545-0848. ; 21:4, s. 67-80
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Tidskriftsartikel (refereegranskat)abstract
- To characterize current risk behaviors of HIV drug abusers in the highly active antiretroviral therapy (HAART) era, socio-demographic, medical and behavioral information were obtained and immune measurements determined. High-risk sexual practices were prevalent. Participants diagnosed before 1995 were 6 times more likely to have unprotected sex with HIV+ partners (p = 0.05) and 11 times more likely to use contaminated needles (p = 0.05) than participants with later diagnosis. Consistent condom use was reported by only 7% of the cohort. Many (43%) of the participants reported multiple HIV+ and HIV- concurrent partners. Most (65%), particularly women (OR = 3, p = 0.02), did so for drugs or money. Despite detectable viral loads, 36% reported unprotected anal sex. Antiretroviral-treated men, compared to non-treated, tended to have unprotected anal sex (OR = 2, p = 0.07). The continued high-risk behaviors of HIV drug users, particularly those diagnosed before 1995 and/or on antiretroviral therapy, indicates an urgent need for new public health strategies.
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| 4. |
- Andreyev, A. N., et al.
(författare)
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New microsecond isomers in Bi-189,Bi-190
- 2001
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Ingår i: European Physical Journal A. - : Springer Science and Business Media LLC. - 1434-6001 .- 1434-601X. ; 10:2, s. 129-133
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Tidskriftsartikel (refereegranskat)abstract
- New microsecond isomers in the neutron-deficient isotopes Bi-189g,Bi-190 have been identified after in-flight separation by the velocity filter SHIP. The evaporation residues were identified on the basis of delayed recoil-gamma /X-ray, recoil-gamma /X-ray-alpha and excitation function measurements. The systematics of the [pi 1i(13/2)]13/2(+) excited states in the odd-mass Bi nuclei is discussed.
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| 5. |
- Andreyev, A. N., et al.
(författare)
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Shape-changing particle decays of Bi-185 and structure of the lightest odd-mass Bi isotopes
- 2004
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 69:5, s. 054308-
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Tidskriftsartikel (refereegranskat)abstract
- Proton and alpha decay of the proton-rich nuclide Bi-185 has been restudied in more detail in the complete fusion reaction Nb-93(Mo-95, 3n)Bi-185 at the velocity filter SHIP. The observed decay pattern of Bi-185 and of the heavier odd-mass isotopes Bi-187,Bi-189,Bi-191,Bi-193 are interpreted based on potential-energy surface calculations. It is shown that the experimental systematics of the particle decays and of the excited states in these nuclei (where known) can be explained by the prolate-oblate shape co-existence at low excitation energy. The observed state in Bi-185 is proposed to be of prolate nature, which is in contrast with the previously proposed oblate interpretation.
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| 6. |
- Andreyev, A. N., et al.
(författare)
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The discovery of a prolate-oblate-spherical shape triple of spin 0(+) states in the atomic nucleus Pb-186
- 2001
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Ingår i: Nuclear Physics A. - : Elsevier BV. - 0375-9474 .- 1873-1554. ; 682, s. 482C-486C
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Tidskriftsartikel (refereegranskat)abstract
- Two excited J(pi)=0(+) states in Pb-186 populated in the a-decay of Po-190 have been identified through alpha -particle/conversion electron coincidences in an experiment at the velocity filter SHIP. The parent Po-190 nuclei have been produced in the Nd-142(Cr-52,4n)Po-190 complete fusion reaction, alpha -particle energies and branching ratios have been measured and hindrance factors were deduced. The observed states have been interpreted as the band heads of the known prolate and (yet unobserved) oblate rotational bands in Pb-186.
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| 8. |
- Birgisson, Björn, et al.
(författare)
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Performance-based fracture criterion for evaluation of moisture susceptibility in hot-mix asphalt
- 2004
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Ingår i: Transportation Research Record. - 0361-1981 .- 2169-4052. ; :1891, s. 55-61
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Tidskriftsartikel (refereegranskat)abstract
- The laboratory testing procedures currently available for testing hot-mix asphalt moisture susceptibility all evaluate the effects of moisture damage in the laboratory by measuring the relative change of a single parameter before and after conditioning (i.e., tensile strength ratio, resilient modulus ratio). The use of a single parameter to evaluate moisture damage must be questioned. Instead, a single unified framework that accounts for changes in key mixture properties is needed to evaluate the effects of moisture damage in mixtures effectively. The use of a new performance-based fracture parameter, the energy ratio (ER), for quantifying the effects of moisture damage on the fracture resistance of mixtures is evaluated here. ER is used to determine the effects of moisture damage on changes in the fracture resistance of six granite mixtures prepared with and without the use of an antistripping additive. The granite aggregate used is a known stripping aggregate. In addition, one limestone mixture with a known high resistance to stripping was used. The results indicate that not only is the ER capable of detecting the effects of moisture damage on the fracture resistance of mixtures, it is also shown to detect the presence of antistripping agents in mixtures. Results indicate that the ER may form the basis of a promising combined performance-based fracture criterion for evaluating the effects of moisture damage in mixtures as well as the overall resistance to fracture.
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| 9. |
- Birgisson, Björn, et al.
(författare)
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The Need for Inducing Shear Instability to Obtain Relevant Parameters for HMA Rut-Resistance
- 2004
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Ingår i: 2004 JOURNAL OF THE ASSOCIATION OF ASPHALT PAVING TECHNOLOGISTS. - : Association of Asphalt Paving Technologists. ; , s. 23-52
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Konferensbidrag (refereegranskat)abstract
- Instability rutting is a major distress mode in hot mix asphalt pavements, which occurs when the structural properties of the compacted mix cannot resist near surface critical stress conditions caused by traffic loads. The critical stress conditions for rutting instability include high near surface shear stresses and low confinement. On the mixture level, instability rutting is manifested in a rearrangement of the aggregate structure. This paper illustrates that it may be necessary to induce instability in mixtures to determine parameters that are relevant to mixture rut resistance. The Superpave(TM) gyratory compactor with shear measurements and the option of changing the compaction angle during compaction was used in this study. Mixtures were compacted to a density that is consistent with the air voids of field pavements immediately after construction, namely 7 percent (+/- 0.5) percent air voids. The subsequent application of high shear stresses by increasing the gyratory angle from 1.25 degrees to 2.5 degrees results in the rearrangement of the aggregate structure during which parameters can be measured that define clear differences in mixtures. Based on the testing of 31 mixtures with different void structure and aggregate characteristics, three distinctive responses were observed: a) brittle response, b) plastic response, under which once the mixtures loose strength due to rearrangement they never regain another stable rearrangement, and c) optimal response, which is bracketed by the plastic and brittle types of responses. Key parameters were identified that are relevant to the rut-resistance of mixtures. Using these new parameters, a framework for the evaluation of mixture rutting potential is developed. Based on a comparison of predicted rutting potential to APA rut depth measurements, as well as a statistical analysis of results, the validity of the proposed framework is established. The results show that the proposed framework has may have the potential for becoming an index test for evaluating the rutting potential of mixtures. Based on the findings of this paper, the proposed approach for evaluating mixture rut-potential should be studied further and validated for an even larger variety of asphalt mixtures.
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