Theories of protection powerful enough to resolve security questions of computer systems are considered. Mo single theory of protection is adequate for proving whether the security afforded by an arbitrary protection system suffices to safeguard data from unauthorized access. When theories of protection are restricted' to computer systems which are bounded in size, adequate theories exist, but ...

Individuals attribute more psychological (e.g., forget) than biological (e.g., eat) or physical (e.g., be touched) properties to supernatural beings (Shtulman, 2008). It is unclear how those domains each contribute to an overall conception of a supernatural being (e.g., God). Undergraduate students (N = 341) responded to nine questions representing the three domains or factors (psychological, b...

We present a direct measurement of the parity-violating parameter Ab by analyzing the left-right forward-backward asymmetry of b quarks in e+ e– + 2° + b;. The SLD experiment observes hadronic decays of 2° bosons produced at resonance in collisions of longitudinally polarized. . elect rons and unpolarized positrons at the SLC. Heavy flavor decays of the 2° are identified by taking advantage of ...

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OBJECTIVE To analyze the differences in placental perfusion in pregnancies following oocyte donation compared to spontaneous pregnancies. PARTICIPANTS AND METHODS A total of 33 patients who became pregnant after oocyte donation are studied and compared to 42 spontaneously pregnant participants. A 3-dimensional Power Doppler is used to obtain 3 placental volumes. Of each volume, 3 portions are...

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1. The acid-base status of the blood of the toad Bufo viridis was studied during adaptation to high salinity and in tap water containing amiloride. 2. Both salt adaptation and immersion for 2-3 days in 5 x io" M amiloride in tap water resulted in a decrease in blood pH (from 7720 ± 0-026 in tap water to 7-4561 0-051 in 500 mOsm NaCl-adapted toads; mean ± S.E.), and a simultaneous decrease in th...

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