Residual strain in free-standing CdTe nanowires overgrown with HgTe

We investigate the crystal properties of CdTe nanowires overgrown with HgTe. Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) confirm, that the growth results in a high ensemble uniformity and that the individual heterostructures are single-crystalline, respectively. We use high-resolution X-ray diffraction (HRXRD) to investigate strain, caused by the small lattice mismatch between the two materials. We find that both CdTe and HgTe show changes in lattice constant compared to the respective bulk lattice constants. The measurements reveal a complex strain pattern with signatures of both uniaxial and shear strains present in the overgrown nanowires

Drugs, Depression, and Dating Violence: Partnering With Schools to Collect and Use Data on Adolescent Risky Behaviors

In 2005, the MetroWest Health Foundation launched a 10-year initiative to conduct the federal Centers for Disease Control and Prevention’s Youth Risk Behavior Survey biennially with every high school and middle school student in the foundation’s 25-town region. The survey asks students about substance use, violence, sexual behaviors, mental health, and nutrition. In the first year of the initiative, about two-thirds of public high schools and half of the middle schools in the region participated. By 2012, every public high school and middle school participated. Encompassing some 40,000 students, the survey is considered to be one of largest, if not the largest, regional census of risky behavior among youth in the country. Schools and communities use the data to change school and law enforcement policies, implement new curriculum, educate parents, expand time for school wellness programs, and secure federal grants. The foundation has used the data to measure the impact of its substance abuse and antibullying initiatives as well as to develop new funding programs, such as adolescent mental health. The foundation\u27s research partner, Education Development Center, was asked to share the data with New York City, which used the data to demonstrate that increasing the minimum age to purchase tobacco is associated with reduced rates of tobacco use among youth

The Backgrounds Data Center

The Strategic Defense Initiative Organization has created data centers for midcourse, plumes, and backgrounds phenomenologies. The Backgrounds Data Center (BDC) has been designated as the prime archive for data collected by SDIO programs. The BDC maintains a Summary Catalog that contains 'metadata,' that is, information about data, such as when the data were obtained, what the spectral range of the data is, and what region of the Earth or sky was observed. Queries to this catalog result in a listing of all data sets (from all experiments in the Summary Catalog) that satisfy the specified criteria. Thus, the user can identify different experiments that made similar observations and order them from the BDC for analysis. On-site users can use the Science Analysis Facility (SAFE for this purpose. For some programs, the BDC maintains a Program Catalog, which can classify data in as many ways as desired (rather than just by position, time, and spectral range as in the Summary Catalog). For example, data sets could be tagged with such diverse parameters as solar illumination angle, signal level, or the value of a particular spectral ratio, as long as these quantities can be read from the digital record or calculated from it by the ingest program. All unclassified catalogs and unclassified data will be remotely accessible