منابع مشابه
Estimating terminal half life by non-compartmental methods with some data below the limit of quantification
In pharmacokinetic studies it occurs more or less frequently that some measurements are reported to be below the limit of quantification. These data are usually discarded in estimating the terminal half-life by non-compartmental methods. We modify this approach to allow for incorporating data below the quantification limit into the analysis. This is achieved by using maximum likelihood methods ...
متن کاملThe half-life of 87Rb.
The half-life of 87Rb was measured by a liquid scintillation method according to the efficiency tracing method. The measuring sample of rubidium chloride was dissolved in a scintillation cocktail of Insta-gel, and the rubidium was determined by gravimetry as tetraphenylborate. The result was (5.56 +/- 0.025) x 10(10) years.
متن کاملHalf-Life Learning Curves in the Defense Acquisition Life Cycle
Learning curves are useful for assessing performance improvement due to the positive impact of learning. In recent years, the deleterious effects of forgetting have also been recognized. Workers experience forgetting or decline in performance over time. Consequently, contemporary learning curves have attempted to incorporate forgetting components into learning curves. An area of increasing inte...
متن کاملShortened platelet half-life in multiple myeloma.
Various defects in platelet function have been reported as being associated with multiple myeloma. In 30 myeloma patients and 15 healthy controls, we investigated platelet survival using in vitro labeling of autologous platelets with 111indium-oxine and measuring the in vivo kinetics of the radioisotope. Significantly shortened platelet half-life in patients averaged 73 hours, while platelet ha...
متن کاملThe half - life of 76 As
In the course of making high-accuracy measurements of arsenic, we found that the most recently published and compiled half-life of 76As did not agree with our data as well as the earlier accepted value. To redetermine this parameter, 76As sources were measured on four Ge gamma detector systems, and an exponential function was fitted to the decay data by two different nonlinear least-squares met...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review C
سال: 2003
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.68.054309