Polarized antiquark flavor asymmetry: Pauli blocking vs. the pion cloud

The flavor asymmetry of the unpolarized antiquark distributions in the proton, dbar(x) - ubar(x) > 0, can qualitatively be explained either by Pauli blocking by the valence quarks, or as an effect of the pion cloud of the nucleon. In contrast, predictions for the polarized asymmetry Delta_ubar(x) - Delta_dbar(x) based on rho meson contributions disagree even in sign with the Pauli blocking picture. We show that in the meson cloud picture a large positive Delta_ubar(x) - Delta_dbar(x) is obtained from pi-N - sigma-N interference-type contributions, as suggested by chiral symmetry. This effect restores the equivalence of the 'quark' and 'meson' descriptions also in the polarized case.Comment: 4 pages, revtex, 3 eps figure

Research and development in CdS photovoltaic film cells Third quarterly progress report, 1 Dec. 1962 - 28 Feb. 1963

Large cadmium sulfide thin film photovoltaic cell

A foam model highlights the differences of the macro- and microrheology of respiratory horse mucus

Native horse mucus is characterized with micro- and macrorheology and compared to hydroxyethylcellulose (HEC) gel as a model. Both systems show comparable viscoelastic properties on the microscale and for the HEC the macrorheology is in good agreement with the microrheology. For the mucus, the viscoelastic moduli on the macroscale are several orders of magnitude larger than on the microscale. Large amplitude oscillatory shear experiments show that the mucus responds nonlinearly at much smaller deformations than HEC. This behavior fosters the assumption that the mucus has a foam like structure on the microscale compared to the typical mesh like structure of the HEC, a model that is supported by cryogenic-scanning-electron-microscopy (CSEM) images. These images allow also to determine the relative amount of volume that is occupied by the pores and the scaffold. Consequently, we can estimate the elastic modulus of the scaffold. We conclude that this particular foam like microstructure should be considered as a key factor for the transport of particulate matter which plays a central role in mucus function with respect to particle penetration. The mesh properties composed of very different components are responsible for macroscopic and microscopic behavior being part of particles fate after landing.Comment: Accepted for publication in the Journal of the Mechanical Behavior of Biomedical Material

Development of cadmium sulfide photovoltaic film cells Final report

Controlled carrier concentrations and improved cell conversion efficiencies in cadmium sulfide photovoltaic film cel

Research and development in cds photovoltaic film cells third quarterly report, nov. 19, 1964 - feb. 19, 1965

Cadmium sulfide photovoltaic film cell

Research and development in CdS photovoltaic cells Third quarterly report, 29 Dec. 1965 - 29 Mar. 1966

Barrier formation studies of copper sulfide and cadmium sulfide in photovoltaic cell

Research and development in cds photovoltaic film cells final report

Fabrication of lightweight, flexible, high efficiency, low cost, thin film, cadmium sulfide solar cells to operate for long periods in space without appreciable degradatio

Impacts of mandatory GE food labeling: a quasi-natural experiment

In July 2016, Vermont became the first U.S. state to require mandatory labeling of foods containing genetically engineered (GE) ingredients. The introduction of the Vermont law serves as a quasi-natural experiment on the economic effects of mandatory GE labeling. We investigate the market response in the U.S. sugar market. Almost all beet sugar is GE, while cane sugar is GE-free. Prior to 2016, cane and beet sugar were regarded as homogenous. However, in mid 2016, refined cane sugar began selling at a premium over refined beet sugar. We find the mandatory labeling initiative generated about a 13% price discount for beet sugar and a premium of about 1% for cane. Food manufacturers’ concerns over mandatory labeling caused them to switch inputs. This resulted in a redistribution of welfare in the U.S. sugar industry