The entrainment rate for a row of turbulent jets

Entrainment rates for a row of isothermal circular air jets issuing into a quiescent environment are found by integrating velocity distributions measured by a linearized hot-wire anemometer. Jet spacing to jet diameter ratios of 2.5, 5, 10, and 20 are studied at jet Reynold's numbers ranging from 5110 to 12070. Velocity distributions are determined at regular downstream intervals at axial distances equal to 16.4 to 164 jet diameters from the jet source. The entrainment rates for the four spacing configurations vary monotonically with increasing spacing/diameter between the limiting case of the slot jet entrainment rate (where the jet spacing to diameter ratio is zero) and the circular jet entrainment rate (in which the spacing to diameter ratio is infinity)

Standardization and application of microsatellite markers for variety identification in tomato and wheat

The present study is part of a EU project that aims to demonstrate the technical viability of STMS markers for variety identification. As examples two important European crop species, tomato and wheat were chosen. Initially, about 30-40 STMS markers were used to identify a set of 20 good markers per crop and to standardise the methodology and the interpretation of the results in different laboratories. Several systems were used for the detection of STMS polymorphisms. The selected STMS markers are being tested on 500 varieties of each species and databases are being constructed. The first comparisons of data generated by the different laboratories revealed a high degree of agreement. The causes of discrepancies between duplicate samples analysed in different laboratories and precautions to prevent them, are discussed

Interface-driven ferromagnetism within the quantum wells of a rare earth titanate superlattice

Here we present polarized neutron reflectometry measurements exploring thin film heterostructures comprised of a strongly correlated Mott state, GdTiO$_3$, embedded with SrTiO$_3$ quantum wells. Our results reveal that the net ferromagnetism inherent to the Mott GdTiO$_3$ matrix propagates into the nominally nonmagnetic SrTiO$_3$ quantum wells and tracks the magnetic order parameter of the host Mott insulating matrix. Beyond a well thickness of 5 SrO layers, the magnetic moment within the wells is dramatically suppressed, suggesting that quenched well magnetism comprises the likely origin of quantum critical magnetotransport in this thin film architecture. Our data demonstrate that the interplay between proximate exchange fields and polarity induced carrier densities can stabilize extended magnetic states within SrTiO$_3$ quantum wells.Comment: 5 pages, 4 figure

Demand for cooking fuels in a developing country. To what extent do taste and preferences matter?

Overreliance on biomass energy, such as firewood and charcoal, for cooking in developing countries has contributed to high rates of deforestation and resulted in substantial indoor pollution which has negatively impacted the health of many individuals. However, the effectiveness of public policies aimed at encouraging households to switch to cleaner fuels, such as liquefied petroleum gas (LPG) and kerosene, hinges on the extent to which they are mentally committed to specific fuels. Using data on four cooking fuels (charcoal, firewood, LPG, and kerosene) from the Ghana living standards survey, we found strong evidence that the most preferred fuel is LPG, followed by charcoal, with kerosene the least preferred. In addition, with the exception of kerosene that has price-elastic demand, the price elasticities of demand for the fuel types examined are inelastic. This finding suggests the so-called fuel-ladder is not robust.Demand for fuel Taste and preferences Ghana

Height Discrimination in Employment

This Article looks critically at heightism, i.e., prejudice or discrimination against a person on the basis of his or her height. Although much scholarship has focused on other forms of trait-based discrimination—most notably weight and appearance discrimination, both of which indirectly involve height as a component—little has focused on “pure” height discrimination. Nevertheless, within the past five years courts, scholars, and legislatures have increasingly tackled these non-traditional forms of discrimination. As such, this Article endeavors to fill the gap in the existing scholarship. This Article specifically focuses on heightism in the workplace, with an emphasis on prejudice against short people because of the unique disadvantages they face vis-à-vis their taller counterparts. It examines the ways that existing federal antidiscrimination laws—namely Title VII of the Civil Rights Act of 1964 and the Americans with Disabilities Act of 1990—do and do not protect against height-based prejudice in the workplace. Moreover, after briefly examining state and local remedies for height discrimination, including state antidiscrimination laws, this Article considers but ultimately rejects enacting a federal law that would flatly prohibit all height-based employment decisions. Although a comprehensive prohibition would be easiest to administer, such a prohibition would prove both gratuitous and unwise. Instead, this Article recommends modest changes to federal regulations and increased state and local enforcement