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Crop Sharing in the Fishery and Industry Equilibrium

This article presents a model of commercial fishing in a stochastic environment that focuses on the labor-employment contract. In a partial equilibrium context, the authors show that when boat owners and crew members are risk-averse, crop sharing is the optimal contract, and the resultant labor employment level will be greater than with a (suboptimal) wage contract. Industry effects and steady-state resource growth limitations are introduced into a market equilibrium model. In this extended model, market equilibria will also involve sharing contracts. These will result in greater employment, which comes at the expense of reduced resource stocks and higher-than-necessary harvesting costs. The article also examines how industry regulation such as licensing, quotas, and subsidies will differ if the prevailing contract is cropsharing as compared with a wage. Despite the fact that cropsharing contracts are privately optimal in a regulated setting, they may not be socially optimal.wage contracts, crop-sharing contracts, equilibrium, fisheries, Environmental Economics and Policy, Labor and Human Capital, Resource /Energy Economics and Policy,

A Programming Circuit For Self‐Stimulation Of The Brain

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/96750/1/jeab.1961.4-196.pd

Simulation at Dryden Flight Research Facility from 1957 to 1982

The Dryden Flight Research Facility has been a leader in developing simulation as an integral part of flight test research. The history of that effort is reviewed, starting in 1957 and continuing to the present time. The contributions of the major program activities conducted at Dryden during this 25-year period to the development of a simulation philosophy and capability is explained

Atomic oxygen effects on candidate coatings for long-term spacecraft in low earth orbit

Candidate atomic oxygen protective coatings for long-term low Earth orbit (LEO) spacecraft were evaluated using the Los Alamos National Laboratory O-atom exposure facility. The coatings studied include Teflon, Al2O3, SiO2, and SWS-V-10, a silicon material. Preliminary results indicate that sputtered PTFE Teflon (0.1 micrometers) has a fluence lifetime of 10 to the 19th power O-atoms/cm (2), and sputtered silicon dioxide (0.1 micrometers), aluminum oxide (0.1 micrometers), and SWS-V-10, a silicone, (4 micrometers) have fluence lifetimes of 10 to the 20th power to 10 to the 21st power O-atoms/cm (2). There are large variations in fluence lifetime data for these coatings

Synthesis and characterization of Bombesin derivatives with potential applications as nuclear medicine imaging/therapeutic agents [abstract]

Abstract only availableFaculty Mentor: Charles J. Smith, RadiologyThe use of tissue specific radiopharmaceuticals presents great promise for diagnostic and therapeutic applications in a number of human cancers. Gastrin-releasing peptide (GRP) receptors are known to be over-expressed on a variety of malignancies including breast, gastric, colon, pancreatic, prostate, and small-cell lung cancers. Experimental work with bombesin (BBN), an amphibian analogue to mammalian GRP, has demonstrated the ability of BBN to bind, with high affinity and specificity, to the GRP receptor. The use of a bifunctional chelating agent (BFCA) allows biologically active molecules to maintain receptor affinity while at the same time complexing a radionuclide. Spacer groups separating the BFCA and biological vector allow for fine tuning of the pharmacokinetics. Bombesin conjugates effectively complexing radioactive copper (i.e. Cu-64; t1/2=12.7h, Eγ=1345.8keV, Eβ-=578keV, Eβ+=651keV) posses potential as imaging agents for diagnostic positron emission tomography (PET) and therapeutic applications.Recently our research group has focused efforts on developing new BBN derivatives of Triaza (1,4,7-triazacyclononane) or functionalized derivatives of Triaza for complexing of specific radionuclides. Our laboratory has previously reported on a series of new Triaza-BBN conjugates. A derivative of this Triaza ligand system, 1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA), has been synthesized by alkylation of the secondary amines of triaza by α-chloroacetic acid prior to conjugation to the biologically active BBN targeting vector. Bombesin conjugates were derived of the form, NOTA-X-BBN (X = ßAla, GGG, SSS). Synthesis of the unligated BBN [7-14] peptide with spacer group was conducted by Fmoc-protected solid-phase peptide synthesis (SPPS). The bombesin constructs were purified prior to conjugation of the ligand framework by means of reverse phase-high performance liquid chromatography (RP-HPLC). The NOTA ligand was conjugated to the N-terminus of the peptide by means of an activated ester derived from N-hydroxysulfosuccinimide and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide HCl in aqueous solution. The final NOTA-X-BBN derivatives were purified by RP-HPLC and confirmed via electrospray ionization-mass spectrometry (ESI-MS). Further studies to evaluate the ability of the derivatives to complex Cu-64 are underway. Subsequent studies will be conducted to evaluate the in vitro and in vivo characteristics of the radiopharmaceutical

Performance and loads data from an outdoor hover test of a Lynx tail rotor

A Lynx tail rotor was tested in hover at the Outdoor Aerodynamic Research Facility at NASA Ames Research Center. The test objectives were to measure the isolated rotor performance to provide a baseline for subsequent testing, and to operate the rotor throughout the speed and collective envelope before testing in the NFAC 40- by 80-Foot Wind Tunnel. Rotor forces and blade bending moments were measured at ambient wind conditions from zero to 6.23 m/sec. The test envelope was limited to rotor speeds of 1550 to 1850 rpm and minus 13 deg to plus 20 deg of blade collective pitch. The isolated rotor performance and blade loads data are presented