Exploiting parallelism is a key to building high-performance database systems. Several approaches to building database systems that support both inter-and intra-query parallelism have been proposed. These approaches can be broadly classiied as either Shared Nothing (SN) or Shared Everything (SE). Although the SN approach is highly scalable, it requires complex data partitioning and tuning to ac...

In this article, passivated Pb-Sn and Pb-Sb alloys with different compositions were studied by X-ray photoelectron spectroscopy (XPS). The passive films were found to have a double-layer structure. Both Sn and Sb were found to play an important role during the growth of passive film, which resulted in different compositions of passive filJ;l1s. The Pb oxides, Pb sulfate, SnlSb oxides, and Pb-Sn...

Reward and novelty are potent learning signals that critically rely on dopaminergic midbrain responses. Recent findings suggest that although reward and novelty are likely to interact, both functions may be subserved by distinct neuronal clusters. We used high-resolution functional magnetic resonance imaging (fMRI) to isolate neural responses to reward and novelty within the human substantia ni...

Reaction of a zirconium imido and a hydrazinediido complex with bis(trimethylsilyl)sulfur diimide yielded the corresponding formal [2+2] cycloaddition products, the trisimidosulfito complex and the hydrazidobis(imido)sulfito complex containing an unprecedented SN(2)(N-N) unit.

RESUMEN Physical models of Type Ia supernovae (SN Ia) that do not depend on secondary calibrators have indicated that the Hubble Constant must be ∼ 65 km s −1 Mpc −1 for well over a decade with the range of uncertainty shrinking with the sophistication of the models. This estimate is in good agreement with those based on HST observations of Cepheid variables and with purely empirical methods ba...

In the title complex, [Fe(C(5)H(5)){Sn(C(2)H(5))(3)}(C(5)H(5)N)(CO)], the Fe atom is coordinated by carbonyl, pyridine, triethyl-stannyl and cyclo-penta-dienyl ligands in a typical three-legged piano-stool configuration. The Fe-Sn and Fe-N bond distances are 2.5455 (13) and 1.984 (6) Å, respectively.

The mol-ecular structure of the title compound, [Sn(2)(C(10)H(13))(4)(C(14)H(20))Cl(2)], is a binuclear centrosymmetric complex, in which the Sn atoms are four-coordinated by three C atoms and one Cl atom in a distorted tetra-hedral geometry.

The dopaminergic system is involved in reward encoding and reinforcement learning. Dopaminergic neurons from this system in the substantia nigra/ventral tegmental area complex (SN/VTA) fire in response to unexpected reinforcing cues. The goal of this study was to investigate whether individuals can gain voluntary control of SN/VTA activity, thereby potentially enhancing dopamine release to targ...

Metastatic breast cancer requires systemic treatment. We have developed a systemic gene therapy approach for breast cancer, consisting of a nonviral gene delivery system (SN) and a proapoptotic gene, bik. The transfection efficiency of SN carrying a reporter gene was 5-10 times higher than the common nonviral agents Fugene-6 and Lipofectamine in the presence of serum. The SN-bik gene complex in...

Exploiting parallelism has become the key to building high-performance database systems. Several approaches to building database systems that support both inter-and intra-query parallelism have been proposed. These approaches can be broadly classiied as either Shared Nothing (SN) or Shared Everything (SE). Although the SN approach is highly scalable, it requires complex data partitioning and tu...