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J. K. Brooks Kazuyuki Saitô JD Maitland Wright 《Rendiconti del Circolo Matematico di Palermo》2003,52(1):5-14
LetA be aC*-algebra with second dualA″. Let (φ
n)(n=1,...) be a sequence in the dual ofA such that limφ
n(a) exists for eacha εA. In general, this does not imply that limφ
n(x) exists for eachx εA″. But if limφ
n(p) exists whenever p is the range projection of a positive self-adjoint element of the unit ball ofA, then it is shown that limφ
n(x) does exist for eachx inA″. This is a non-commutative generalisation of a celebrated theorem of Dieudonné. A new proof of Dieudonné’s theorem, for
positive measures, is given here. The proof of the main result makes use of Dieudonné’s original theorem. 相似文献
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Nuevo-Ordóñez Y Montes-Bayón M Blanco-González E Paz-Aparicio J Raimundez JD Tejerina JM Peña MA Sanz-Medel A 《Analytical and bioanalytical chemistry》2011,401(9):2747-2754
Increased concentrations of circulating metal-degradation products derived from the use of Ti orthopaedic implants may have
deleterious biological effects over the long term. Therefore, there is an increasing need to establish the basal level of
Ti in the serum of the population (exposed and non-exposed) with appropriate highly sensitive techniques and strategies. With
this aim, we have developed a quantitative strategy for the determination of total Ti concentration in human serum samples
by isotope dilution analysis using a double-focussing inductively coupled plasma mass spectrometer. Minimizing sample handling
and therefore contamination issues, we obtained detection limits of about 0.05 μg L−1 Ti working at medium resolution (m/Δm 4000). Such extremely good sensitivity permitted us to establish the range of Ti concentration
in serum of 40 control individuals (mean 0.26 μg L−1) and also to compare it with the level in exposed patients with different Ti metal implants. On the other hand, Ti transport
“in vivo” studies have been enabled by online coupling of liquid chromatography (anion-exchange) separation and double-focussing
inductively coupled plasma mass spectrometry for sensitive detection of Ti. The development of a postcolumn isotope dilution
strategy permitted quantitative characterization of the Ti-transporting biomolecules in human serum. The results for unspiked
serum revealed that 99.8% of the Ti present in this fluid is bound to the protein transferrin, with column recoveries greater
than 95%. 相似文献
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The eigen frequencies of radial pulsations of neutron stars are calculated in a strong magnetic field. At low densities we
use the magnetic BPS equation of state (EOS) similar to that obtained by Lai and Shapiro while at high densities the EOS obtained
from the relativistic nuclear mean field theory is taken and extended to include strong magnetic field. It is found that magnetized
neutron stars support higher maximum mass whereas the effect of magnetic field on radial stability for observed neutron star
masses is minimal. 相似文献
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临界电流密度Jc是影响高温超导体在强电领域应用的一个重要参数,在实际应用中,特别在外加磁场下,临界电流密度与超导材料的磁通钉扎性质密切相关.因此,磁通钉扎一直是高温超导体研究中的一个重要领域.由于高温超导体磁通钉扎力密度Fp的标度律存在,本文根据D.Dew-Hughes总结的钉扎力函数,主要存在两种主要作用类型(正常相和△K).我们将D.Dew-HugBes给出的钉扎力密度Fp标度函数改进为一个简化的具有物理意义的函数表达式.结合文献中已有的实验数据,我们对YBcO进行了计算机模拟,确定了它的磁通钉扎类型,模拟的研究结果与实际情况比较吻合. 相似文献
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