Modeling the long-term durability of concrete barriers in the context of low-activity waste storage

The paper investigates the long-term durability of concrete barriers in contact with a cementitious wasteform designed to immobilize low-activity nuclear waste. The high-pH pore solution of the wasteform contains high concentration level of sulfate, nitrate, nitrite and alkalis. The multilayer concrete/wasteform system was modeled using a multiionic reactive transport model accounting for coupling between species, dissolution/ precipitation reactions, and feedback effect. One of the primary objectives was to investigate the risk associated with the presence of sulfate in the wasteform on the durability of concrete. Simulation results showed that formation of expansive phases, such as gypsum and ettringite, into the concrete barrier was not extensive. Based on those results, it was not possible to conclude that concrete would be severely damaged, even after 5,000 years. Lab work was performed to provide data to validate the modeling results. Paste samples were immersed in sulfate contact solutions and analyzed to measure the impact of the aggressive environment on the material. The results obtained so far tend to confirm the numerical simulations

Tratamento de infecções crônicas recidivantes do aparelho respiratório: estudo comparativo da eficácia da imunoterapia inespecífica através do imunoadjuvante P40 e da vacinoterapia.

O tratamento de infecções crônicas recidivantes (I.C.R.) encontra muitas dificuldades. No presente estudo, o uso do imunoadjuvante P40, quer isolado, quer associado a vacinoterapia no tratamento de I.C.R., demonstrou ser muito eficaz, ao passo que a vacinoterapia isoladamente não o foi. Foi aventada a hipótese de que a imunidade mediada por células pode desempenhar papel importante no contrôle das I.C.R., uma vez que a melhora clínica dos pacientes foi acompanhada de positivação de testes cutâneos anteriormente negativos, testes estes realizados quer com o agente infeccioso específico, quer com antígeno inespecífico de refôrço.The treatment of relapsing chronic infections (RCI) encounters many difficulties. In the present study, the use of the immuno adjuvant P40 either alone or in association with vaccinotherapy for the treatment of RCI turned out to be very effective, whereas vaccinotherapy alone was not. It is hypothesized that cell-mediated immunity may play a major role in controlling RCI, since the clinical improvement of the patients kept up with the positivation of previously negative skin tests carried out with either the specific infecting agent or with recall-anti gens

Treatment of relapsing chronic infections of the respiratory tract: a comparative study of the effectiveness of non specific immunotherapy with the immunoadjuvant p40 and of vaccinotherapy

The treatment of relapsing chronic infections (RCI) encounters many difficulties. In the present study, the use of the immuno adjuvant P40 either alone or in association with vaccinotherapy for the treatment of RCI turned out to be very effective, whereas vaccinotherapy alone was not. It is hypothesized that cell-mediated immunity may play a major role in controlling RCI, since the clinical improvement of the patients kept up with the positivation of previously negative skin tests carried out with either the specific infecting agent or with recall-anti gens

Treatment of relapsing chronic infections of the respiratory tract: a comparative study of the effectiveness of non specific immunotherapy with the immunoadjuvant p40 and of vaccinotherapy Tratamento de infecções crônicas recidivantes do aparelho respiratório: estudo comparativo da eficácia da imunoterapia inespecífica através do imunoadjuvante P40 e da vacinoterapia.

The treatment of relapsing chronic infections (RCI) encounters many difficulties. In the present study, the use of the immuno adjuvant P40 either alone or in association with vaccinotherapy for the treatment of RCI turned out to be very effective, whereas vaccinotherapy alone was not. It is hypothesized that cell-mediated immunity may play a major role in controlling RCI, since the clinical improvement of the patients kept up with the positivation of previously negative skin tests carried out with either the specific infecting agent or with recall-anti gens.O tratamento de infecções crônicas recidivantes (I.C.R.) encontra muitas dificuldades. No presente estudo, o uso do imunoadjuvante P40, quer isolado, quer associado a vacinoterapia no tratamento de I.C.R., demonstrou ser muito eficaz, ao passo que a vacinoterapia isoladamente não o foi. Foi aventada a hipótese de que a imunidade mediada por células pode desempenhar papel importante no contrôle das I.C.R., uma vez que a melhora clínica dos pacientes foi acompanhada de positivação de testes cutâneos anteriormente negativos, testes estes realizados quer com o agente infeccioso específico, quer com antígeno inespecífico de refôrço