Measuring research progress in photovoltaics

The role and some results of the project analysis and integration function in the Flat-plate Solar Array (FSA) Project are presented. Activities included supporting the decision-making process, preparation of plans for project direction, setting goals for project activities, measuring progress within the project, and the development and maintenance of analytical models

Many-body system with a four-parameter family of point interactions in one dimension

We consider a four-parameter family of point interactions in one dimension. This family is a generalization of the usual $\delta$-function potential. We examine a system consisting of many particles of equal masses that are interacting pairwise through such a generalized point interaction. We follow McGuire who obtained exact solutions for the system when the interaction is the $\delta$-function potential. We find exact bound states with the four-parameter family. For the scattering problem, however, we have not been so successful. This is because, as we point out, the condition of no diffraction that is crucial in McGuire's method is not satisfied except when the four-parameter family is essentially reduced to the $\delta$-function potential.Comment: 8 pages, 4 figure

Peripherally Inserted Central Catheters vs Peripheral Cannulas for Delivering Parenteral Nutrition in Neonates

CLINICAL QUESTION: Is parenteral nutrition via peripherally inserted central catheters (PICCs) associated with better delivery of nutrition and growth and fewer adverse events compared with short peripheral cannulas in neonates? BOTTOM LINE: Compared with short peripheral cannulas, parenteral nutrition via PICCs is associated with better nutrient delivery and lower rates of subsequent catheters or cannulas placed and is not associated with increased rates of invasive infection

A Reanalysis of the Occurrence, Size and Composition of Communal Groups of Prairie Voles (Microtus ochrogaster)

In our previous analyses of occurrence, size, and composition of communal groups of prairie voles (Microtus ochrogaster), we treated population density as a categorical variable ( 100/h) and used spring through early autumn and late autumn through winter as seasonal categories. To determine if these broad groupings biased our results, we reanalyzed the data treating density as a continuous variable and using a finer seasonal scale. We also conducted new analyses regarding composition of communal groups (specifically, proportion of adult male residents in relation to season and population density) and compared sex ratios of residents of communal groups, residents of all social groups and non-residents.Ope

Quasi-one-dimensional Bose gases with large scattering length

Bose gases confined in highly-elongated harmonic traps are investigated over a wide range of interaction strengths using quantum Monte Carlo techniques. We find that the properties of a Bose gas under tight transverse confinement are well reproduced by a 1d model Hamiltonian with contact interactions. We point out the existence of a unitary regime, where the properties of the quasi-1d Bose gas become independent of the actual value of the 3d scattering length. In this unitary regime, the energy of the system is well described by a hard rod equation of state. We investigate the stability of quasi-1d Bose gases with positive and negative 3d scattering length.Comment: 5 pages, 3 figure