Exploring intraspecific life history patterns in sharks

Marine ecosystems compose the major source (85%) of world fisheries production (Garcia and Newton, 1997). Although only a few fish species tend to dominate fishery catches (Jennings et al., 2001), a large diversity of fishes representing varied taxonomic levels, ecological guilds, and life histories is commonly taken. Recently, 66% of global marine resources were determined to be either fully, heavily, or over-exploited (Botsford et al., 1997). Considering the current state of many fisheries, the large diversity of species taken globally, and the general lack of resources to adequately assess many stocks, it has become important to develop shortcuts that may provide methods fisheries scientists can use to determine which stocks are in danger of overexploitation and which recovery plans are appropriate when biological data are limited (Stobutzki et al., 2001)

Health Insurance in Nonstandard Jobs and Small Firms: Differences for Parents by Race and Ethnicity

Focuses on the higher rates of small-firm and nonstandard employment and of uninsurance regardless of job type among Latino/Hispanic and African-American parents. Considers healthcare reform provisions' effects on their insurance costs and coverage rates

Generalized Newton-Raphson trajectory optimization-generator 1

Computer program constructs a sequence of optimal solutions to dynamically-approximate linear equations. Specification of the number and type of subarcs in the optimal solution allows simultaneous satisfaction of all switching criteria

A Look At The Merchant Marine Act Of 1920: Is It Time For The U.S. To Change Course?

Due to recent changes in global shipping, we investigate the Merchant Marine Act of 1920 – also known as the Jones Act. When constructed, our governing body decided that the Act was necessary for the country’s naval defenses and for proper growth of foreign and domestic commerce. The plan was for the fleet to be owned and operated privately by citizens of the United States. However, in today’s economic conditions some are wondering if the Jones Act is a liability to foreign commerce. In our work, we explore the advantages of naval defense and shipbuilding as well as the disadvantages on commerce and U.S. transportation infrastructure. To conclude, we offer opinions for policy changes to create a more level playing field for the U.S. to compete in global logistics

Flexible Resource Allocation: A Comparison Of Linear Diophantine Analysis And Integer Programming

To help production managers cope with an ever changing and complex business environment, we investigate a flexible methodology for solving integer resource allocation problems. Solutions obtained to an example problem using the Linear Diophantine Equation (LDE) methodology presented are compared to solutions produced using Integer Programming. Tradeoffs are examined and discussed, and suggestions are made for managers facing resource decisions similar to the example studied

Effects of radiation on charge-coupled devices

The effects of 1 MeV electron irradiation upon the performance of two phase, polysilicon aluminum gate CCDs are reported. Both n- and p-surface channel and n-buried channel devices are investigated using 64- and 128-stage line arrays. Characteristics measured as a function of radiation dose include: Transfer inefficiency, threshold voltage, field effect mobility, interface state density, full well signal level and dark current. Surface channel devices are found to degrade considerably at less than 10 to the 5th power rads (Si) due to the large increase in fast interface state density caused by radiation. Buried channel devices maintain efficient operation to the highest dose levels used

Pair distribution functions calculated from interatomic potential models using the General Utility Lattice Program.

A new module has been developed for the widely used General Utility Lattice\ud Program (GULP). The phonon-based theory developed by Chung & Thorpe\ud [Phys. Rev. B (1999), 59, 4807–4812] to calculate pair distribution function\ud (PDF) peak widths has been utilized to give a selection of commonly used\ud correlation functions. A numerical library of neutron scattering information is\ud now available within GULP, and is used to produce results that can be\ud compared with neutron scattering experimental data. The influence of different\ud phonon modes on the PDF can be assessed by excluding modes above or below\ud a cut-off frequency. Results are presented for sample crystallographic systems,\ud MgO, SrTiO3 and -cristobalite, as well as CaxSr1xTiO3 at x = 0.5, which makes\ud use of the capability to handle partial occupancies to compare different Ca/Sr\ud ordering arrangements with a disordered model in which every Ca/Sr site has\ud 50% occupancy of both species