Factors modifying the response of large animals to low-intensity radiation exposure

In assessing the biological response to space radiation, two of the most important modifying factors are dose protraction and dose distribution to the body. Studies are reported in which sheep and swine were used to compare the hematology and lethality response resulting from radiation exposure encountered in a variety of forms, including acute (high dose-rate), chronic (low dose-rate), combinations of acute and chronic, and whether received as a continuous or as fractionated exposure. While sheep and swine are basically similar in response to acute radiation, their sensitivity to chronic irradiation is markedly different. Sheep remain relatively sensitive as the radiation exposure is protracted while swine are more resistant and capable of surviving extremely large doses of chronic irradiation. This response to chronic irradiation correlated well with changes in radiosensitivity and recovery following an acute, sublethal exposure

Will You Miss Me When I Am Gone? The Economic Consequences of Absent Parents

This paper examines the effects of family structure on the economic resources available to children, using family fixed-effects to control for unobservable characteristics of the family. The effects of divorce on the income and consumption of children born to two-parent households, and the effects of marriage on children born into single-parent households are both considered. In the long-run (six or more years after the most recent divorce) family income falls by 40 to 45% after divorce, and food consumption is reduced by 17%. Six or more years after the most recent marriage, income of children born to single parents rises by 50 to 57%, but there is no statistically significant increase in food consumption. These estimates are substantially less than the difference in income implied by cross-sectional comparisons of different family types. When income changes are measured according to time since the parents first divorce, there is substantial recovery in income, virtually all of which is explained by subsequent remarriages. Similarly, when we look at income several years after a parent's first marriage, the gain is 28 to 33%, reflecting the short-lived nature of many of these marriages.

Shock-induced separation of adiabatic turbulent boundary layers in supersonic axially symmetric internal flow

An experimental investigation at Mach 4 of shock-induced turbulent boundary layer separation at the walls of axially symmetric flow passages is discussed, with particular emphasis placed on determining the shock strengths required for incipient separation. The shock waves were produced by interchangeable sting-mounted cones placed on the axes of the flow passages and aligned with the freestream flow. The interactions under study simulate those encountered in axially symmetric engine inlets of supersonic aircraft. Knowledges of the shock strengths required for boundary layer separation in inlets is important since for shocks of somewhat greater strength rather drastic alterations in the inlet flow field may occur

Velocity-dependent energy gaps and dynamics of superfluid neutron stars

We show that suppression of the baryon energy gaps, caused by the relative motion of superfluid and normal liquid components, can substantially influence dynamical properties and evolution of neutron stars. This effect has been previously ignored in the neutron-star literature.Comment: 6 pages, 5 figures, accepted by MNRAS Let

A new solid-state logarithmic radiometer

Combination of temperature-compensated logarithmic amplifiers and p-i-n photodiodes operating in zero-bias mode provides lightweight radiometer for detecting spectral intensities encompassing more than three decades over a range of at least 300 to 800 nanometers at low power levels

Iran, America and Iranian American Community in Firoozeh Jazayeri Dumas\u27 Funny in Farsi

Post 9/11 the United States of America concerns the reconstruction of already demonized identities of Arabs and Middle-eastern cultures. Postcolonial works reside in their rendering a tragic or serious image of Middle Easterners to bring the Western (American) audience into sympathizing with the Middle Eastern ethnicities. Could it be the case that a fundamentally humorous (not derogatory) depiction might contribute to easing such cultural tensions? Firoozeh Jazayeri Dumas\u27 works stand out as critically acclaimed and successful works familiarizing the American audience with the more humane, likeable, sweet and funny aspects of the Iranians and Iranian culture, and the hardships of being an Iranian immigrant and becoming a hybrid individual. This article explores the already-hybridized self and psyche of Firoozeh as an Iranian American. She writes about her mother land and her residence country and comparing the way she has written about them can help readers understand how one can make peace between different parts of her identity

A practical experience with independent verification and validation

One approach to reducing software cost and increasing reliability is the use of an independent verification and validation (IV & V) methodology. The Software Engineering Laboratory (SEL) applied the IV & V methodology to two medium-size flight dynamics software development projects. Then, to measure the effectiveness of the IV & V approach, the SEL compared these two projects with two similar past projects, using measures like productivity, reliability, and maintain ablilty. Results indicated that the use of the IV & V methodology did not help the overall process nor improve the product in these cases