An Unusual Type of Sterility in a Bull

A purebred 22-month-old Shorthorn bull was admitted to Stange Memorial Clinic on Oct. 4, 1950. The history indicated that the animal had normal sexual desire but was unable to protrude his penis

Think Piece: Action Competence through Ethno-Geography

Climate change is due to the accelerated greenhouse effect caused by modern Western ways of living, in which factors like the burning of fossil fuels for energy and the high consumption of beef are perceived to be an essential part of living, but which emit increasing levels of greenhouse gases (e.g. carbon dioxide [CO2] and methane) into the atmosphere. Greenhouse gases prevent long-wave radiation from escaping the Earth’s atmosphere, thus causing a rise in the global temperature. People living in different places around the world may or may not experience the various consequences of this temperature rise in their daily lives. Depending on where one lives, these consequences might range from extended droughts to an increased number and intensity of storms, precipitation and flooding. This two-sided problem, people’s modern way of living influencing the global climate and their living conditions in turn being highly influenced by climate changes, is exemplary for the subject of Geography, which is about humans’ interaction with nature (Physical Geography)

Study of a heat rejection system using capillary pumping

Results of an analytical study investigating the application of capillary pumping to the heat rejection loop of an advanced Rankine cycle power conversion system are presented. The feasibility of the concept of capillary pumping as an alternate to electromagnetic pumping is analytically demonstrated. Capillary pumping is shown to provide a potential for weight and electrical power saving and reliability through the use of redundant systems. A screen wick pump design with arterial feed lines was analytically developed. Advantages of this design are high thermodynamic and hydrodynamic efficiency, which provide a lightweight easily packaged system. Operational problems were identified which must be solved for successful application of capillary pumping. The most important are the development of start up and shutdown procedures, and development of a means of keeping noncondensibles from the system and of earth-bound testing procedures

Phase B: Final definition and preliminary design study for the initial Atmospheric Cloud Physics Laboratory (ACPL): A spacelab mission payload. Final review (DR-MA-03)

Systems design for an initial atmospheric cloud physics laboratory to study microphysical processes in zero gravity is presented. Included are descriptions of the fluid, thermal, mechanical, control and data, and electrical distribution interfaces with Spacelab. Schedule and cost analysis are discussed

Final definition and preliminary design study for the initial Atmospheric Cloud Physics Laboratory (ACPL). Phase B: A Spacelab mission payload

Engineering analyses and trades necessary to identify a preferred laboratory concept which will meet the science requirements were conducted. Results are summarized

Phase B: Final definition and preliminary design study for the initial Atmospheric Cloud Physics Laboratory (ACPL): A Spacelab mission payload

A program outline is presented. Emphasis is placed on the definition and preliminary design of the laboratory to provide a firm basis for subsequent hardware development, production, and operation

A generalization of Clausen's identity

The paper aims to generalize Clausen's identity to the square of any Gauss hypergeometric function. Accordingly, solutions of the related 3rd order linear differential equation are found in terms of certain bivariate series that can reduce to 3F2 series similar to those in Clausen's identity. The general contiguous variation of Clausen's identity is found. The related Chaundy's identity is generalized without any restriction on the parameters of Gauss hypergeometric function. The special case of dihedral Gauss hypergeometric functions is underscored

Dynamical Effects from Asteroid Belts for Planetary Systems

The orbital evolution and stability of planetary systems with interaction from the belts is studied using the standard phase-plane analysis. In addition to the fixed point which corresponds to the Keplerian orbit, there are other fixed points around the inner and outer edges of the belt. Our results show that for the planets, the probability to move stably around the inner edge is larger than the one to move around the outer edge. It is also interesting that there is a limit cycle of semi-attractor for a particular case. Applying our results to the Solar System, we find that our results could provide a natural mechanism to do the orbit rearrangement for the larger Kuiper Belt Objects and thus successfully explain the absence of these objects beyond 50 AU.Comment: accepted by International Journal of Bifurcation and Chaos in Aug. 2003, AAS Latex, 27 pages with 6 color figure

Conditional quantum-state transformation at a beam splitter

Using conditional measurement on a beam splitter, we study the transformation of the quantum state of the signal mode within the concept of two-port non-unitary transformation. Allowing for arbitrary quantum states of both the input reference mode and the output reference mode on which the measurement is performed, we show that the non-unitary transformation operator can be given as an $s$-ordered operator product, where the value of $s$ is entirely determined by the absolute value of the beam splitter reflectance (or transmittance). The formalism generalizes previously obtained results that can be recovered by simple specification of the non-unitary transformation operator. As an application, we consider the generation of Schr\"odinger-cat-like states. An extension to mixed states and imperfect detection is outlined.Comment: 7 Postscript figures, using Late