277 research outputs found
Sudesna mjerenja γγ-raspada stanja 166Ho nastalih reakcijom (n,γ)
Levels of 166Ho were studied using thermal and average resonance neutron capture and with the (d,p) and (d,3He) reactions. We have devoted a large effort to the measurements of the γγ-coincidence spectra in the broad energy region 50 - 6243 keV. Based on these data and those of earlier studies, the levels are grouped into 23 rotational bands. Among them are 6 new ones. The results are in good agreement with the semiempirical and quasiparticle-phonon model, where Coriolis and residual interactions are taken into account. Details of model interpretation have been presented in a previously published paper.ProuÄavali smo stanja 166Ho nastala termiÄkim i prosjeÄnim rezonantnim uhvatom neutrona, te (d,p) i (d,3He) reakcijama. UloĆŸili smo velik trud u mjerenjima sudesnih γγ-spektara u ĆĄirokom energijskom podruÄju od 50 do 6243 keV. Na osnovi tih i ranijih podataka, stanja su grupirana u 23 rotacijske vrpce. MeÄu njima je i 6 novih. Ishodi su u suglasju s poluempiriÄkim i kvaziÄestiÄno-fononskim modelom, uzimajuÄi u obzir Coriolisovo meÄudjelovanje i rezidualne interakcije. Podrobnosti modelskog tumaÄenja objavljene u u ranijem Älanku
Differential antitumor immunity mediated by NKT cell subsets in vivo
We showed previously that NKT cellâdeficient TCR Jα18(â/â) mice are more susceptible to methylcholanthrene (MCA)-induced sarcomas, and that normal tumor surveillance can be restored by adoptive transfer of WT liver-derived NKT cells. Liver-derived NKT cells were used in these studies because of their relative abundance in this organ, and it was assumed that they were representative of NKT cells from other sites. We compared NKT cells from liver, thymus, and spleen for their ability to mediate rejection of the sarcoma cell line (MCA-1) in vivo, and found that this was a specialized function of liver-derived NKT cells. Furthermore, when CD4(+) and CD4(â) liver-derived NKT cells were administered separately, MCA-1 rejection was mediated primarily by the CD4(â) fraction. Very similar results were achieved using the B16F10 melanoma metastasis model, which requires NKT cell stimulation with α-galactosylceramide. The impaired ability of thymus-derived NKT cells was due, in part, to their production of IL-4, because tumor immunity was clearly enhanced after transfer of IL-4âdeficient thymus-derived NKT cells. This is the first study to demonstrate the existence of functionally distinct NKT cell subsets in vivo and may shed light on the long-appreciated paradox that NKT cells function as immunosuppressive cells in some disease models, whereas they promote cell-mediated immunity in others
Supporting patients experiencing poverty-related mental distress: development and evaluation of a training resource in general practices in eleven regions of England
This is the final version. Available from Elsevier via the DOI in this record.âŻNational Institute for Health Researc
Phase appearance or disappearance in two-phase flows
This paper is devoted to the treatment of specific numerical problems which
appear when phase appearance or disappearance occurs in models of two-phase
flows. Such models have crucial importance in many industrial areas such as
nuclear power plant safety studies. In this paper, two outstanding problems are
identified: first, the loss of hyperbolicity of the system when a phase appears
or disappears and second, the lack of positivity of standard shock capturing
schemes such as the Roe scheme. After an asymptotic study of the model, this
paper proposes accurate and robust numerical methods adapted to the simulation
of phase appearance or disappearance. Polynomial solvers are developed to avoid
the use of eigenvectors which are needed in usual shock capturing schemes, and
a method based on an adaptive numerical diffusion is designed to treat the
positivity problems. An alternate method, based on the use of the hyperbolic
tangent function instead of a polynomial, is also considered. Numerical results
are presented which demonstrate the efficiency of the proposed solutions
ProuÄavanje 194Ir uhvatom termiÄkih neutrona I (d, p) reakcijom
Levels of 194Ir were studied using thermal neutron capture reaction. A pair spectrometer was used to measure the high-energy Îł-ray spectrum from thermal-neutron capture in enriched 193Ir target over the energy range 4640 - 6100 keV. The low-energy Îł-radiation from the reaction was studied with crystal diffraction spectrometers, and conversion electrons were observed with magnetic spectrometers. The high-sensitivity measurements at the Grenoble reactor, evaluated for transition energies up to 500 keV, are compared with lower-sensitivity measurements at the Wuerenlingen and Salaspils reactors. The comparison helped to obtain reliable isotopic identification for a number of 194Ir lines. The multipolarity admixtures for 29 Îł-transitions were determined on the basis of conversion lines from different electron subshells. Prompt and delayed Îł-Îł coincidences were measured using semiconductor and scintillation detectors. The 193Ir(d,p) high-resolution spectra, observed with a magnetic spectrometer, are given. All these data contributed to establishing a detailed level scheme of 194Ir. Additional data and the interpretation of the results in terms of current models will be presented in a forthcoming paper.ProuÄavala su se stanja u 194Ir reakcijama 193Ir(n, Îł) i 193Ir(d, p). Mjerenja uhvata termiÄkih neutrona naÄinjena su uz reaktore u Grenoblu, Wuerenlingenu i Salapsisu. Za mjerenja Îł-zraÄenja visoke energije upotrebljavao se spektrometar parova, a za niske energije difraktometar. Konverzijske elektrone se mjerilo magnetskim spektrometrom. Mjerenja reakcije (d, p) visokog razluÄivanja izvedena su magnetskim spektrometrom. Usporedbe tih mjerenja omoguÄile su pouzdano izotopno prepoznavanje prijelaza u 194 Ir, a spektri konverzijskih elektrona i odreÄivanje multipolnosti prijelaza. Dobiveni su podaci osnova sheme raspada 194Ir
Study of ^194 Ir via thermal neutron capture and (d,p) reactions
Levels of ^194 Ir were studied using thermal neutron capture reaction. A pair spectrometer was used to measure the high-energy gamma-ray spectrum from thermal-neutron capture in enriched ^193 Ir target over the energy range 4640 - 6100 keV. The low-energy gamma-radiation from the reaction was studied with crystal diffraction spectrometers, and conversion electrons were observed with magnetic spectrometers. The high-sensitivity measurements at the Grenoble reactor, evaluated for transition energies up to 500 keV, are compared with lower-sensitivity measurements at the Wuerenlingen and Salaspils reactors. The comparison helped to obtain reliable isotopic identification for a number of ^194 Ir lines. The multipolarity admixtures for 29 gamma-transitions were determined on the basis of conversion lines from different electron subshells. Prompt and delayed gamma-gamma coincidences were measured using semiconductor and scintillation detectors. The ^193 Ir(d,p) high-resolution spectra, observed with a magnetic spectrometer, are given. All these data contributed to establishing a detailed level scheme of ^194 Ir. Additional data and the interpretation of the results in terms of current models will be presented in a forthcoming paper
Associations of T cell activation and inflammatory biomarkers with virological response to darunavir/ritonavir plus raltegravir therapy
One of the goals of antiretroviral therapy (ART) is to attenuate HIV-induced systemic immune activation and inflammation. We determined the dynamics of biomarkers of immune activation, microbial translocation and inflammation during initial ART with a nucleos(t)ide-sparing regimen of darunavir/ritonavir plus raltegravir. We also evaluated associations between these biomarkers and the virological response to the regimen
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