709 research outputs found
The XV-15 tilt rotor research aircraft
The design characteristics of the XV-15 Tilt rotor research aircraft are presented. Particular attention is given to the following: control system; conversion system; and propulsion system. Flight test results are also reported
CO2OK: CO2 – optimierte Großküchen in Hessen - Bilanzierung und Optimierung -
Ziel des Projektes war es mit Bezug auf die allgemeinen Klimaschutzziele des Landes Hessen Grundlagen für den bisher wenig beachteten Markt der Außer-Haus-Verpflegung (AHV) zu erheben. Dafür sollte eine Treibhausgas (THG) -Bilanzierung in ausgewählten Großküchen durchgeführt werden. Basierend auf den Ergebnissen wurden Optimierungsfelder erarbeitet und aufgezeigt. Zur Gewinnung der entsprechenden Grundlagen wurden sowohl standortbezogene Bilanzierungen als auch die Berechnungen von Einzelmenüs angestrebt. Die Ergebnisse der Bilanzierung sowie die aufgezeigten Optimierungsfelder bzw. THG-Einsparpotenziale, könnten als Basis dienen für die Ausarbeitung von vertiefenden Klimaschutzzielen im Bereich der AHV im hessischen Klimaschutzplan 2025
Y-12 Site Sustainability Plan
This plan addresses: Greenhouse Gas Reduction and Comprehensive Greenhouse Gas Inventory; Buildings, ESPC Initiative Schedule, and Regional and Local Planning; Fleet Management; Water Use Efficiency and Management; Pollution Prevention and Waste Reduction; Sustainable Acquisition; Electronic Stewardship and Data Centers; Renewable Energy; Climate Change; and Budget and Funding
Investigation of the chemical vicinity of crystal defects in ion-irradiated Mg and AZ31 with coincident Doppler broadening spectroscopy
Crystal defects in magnesium and magnesium based alloys like AZ31 are of
major importance for the understanding of their macroscopic properties. We have
investigated defects and their chemical surrounding in Mg and AZ31 on an atomic
scale with Doppler broadening spectroscopy of the positron annihilation
radiation. In these Doppler spectra the chemical information and the defect
contribution have to be thoroughly separated. For this reason samples of
annealed Mg were irradiated with Mg-ions in order to create exclusively
defects. In addition Al- and Zn-ion irradiation on Mg-samples was performed in
order to create samples with defects and impurity atoms. The ion irradiated
area on the samples was investigated with laterally and depth resolved positron
Doppler broadening spectroscopy (DBS) and compared with preceding
SRIM-simulations of the vacancy distribution, which are in excellent agreement.
The investigation of the chemical vicinity of crystal defects in AZ31 was
performed with coincident Doppler broadening spectroscopy (CDBS) by comparing
Mg-ion irradiated AZ31 with Mg-ion irradiated Mg. No formation of
solute-vacancy complexes was found due to the ion irradiation, despite the high
defect mobility.Comment: Submitted to Physical Review B on March 20 20076. Revised version
submitted on September 28 2007. Accepted on October 19 200
Social Determinants of Long Lasting Insecticidal Hammock-Use Among the Ra-Glai Ethnic Minority in Vietnam: Implications for Forest Malaria Control
BACKGROUND: Long-lasting insecticidal hammocks (LLIHs) are being evaluated as an additional malaria prevention tool in settings where standard control strategies have a limited impact. This is the case among the Ra-glai ethnic minority communities of Ninh Thuan, one of the forested and mountainous provinces of Central Vietnam where malaria morbidity persist due to the sylvatic nature of the main malaria vector An. dirus and the dependence of the population on the forest for subsistence - as is the case for many impoverished ethnic minorities in Southeast Asia. METHODS: A social science study was carried out ancillary to a community-based cluster randomized trial on the effectiveness of LLIHs to control forest malaria. The social science research strategy consisted of a mixed methods study triangulating qualitative data from focused ethnography and quantitative data collected during a malariometric cross-sectional survey on a random sample of 2,045 study participants. RESULTS: To meet work requirements during the labor intensive malaria transmission and rainy season, Ra-glai slash and burn farmers combine living in government supported villages along the road with a second home at their fields located in the forest. LLIH use was evaluated in both locations. During daytime, LLIH use at village level was reported by 69.3% of all respondents, and in forest fields this was 73.2%. In the evening, 54.1% used the LLIHs in the villages, while at the fields this was 20.7%. At night, LLIH use was minimal, regardless of the location (village 4.4%; forest 6.4%). DISCUSSION: Despite the free distribution of insecticide-treated nets (ITNs) and LLIHs, around half the local population remains largely unprotected when sleeping in their forest plot huts. In order to tackle forest malaria more effectively, control policies should explicitly target forest fields where ethnic minority farmers are more vulnerable to malaria
Electronic structure of LaBr3 from quasi-particle self-consistent GW calculations
Rare-earth based scintillators in general and lanthanum bromide (LaBr_3) in
particular represent a challenging class of materials due to pronounced
spin-orbit coupling and subtle interactions between d and f states that cannot
be reproduced by standard density functional theory (DFT). Here a detailed
investigation of the electronic band structure of LaBr_3 using the
quasi-particle self-consistent GW (QPscGW) method is presented. This
parameter-free approach is shown to yield an excellent description of the
electronic structure of LaBr_3. Specifically it is able to reproduce the band
gap, the correct level ordering and spacing of the 4f and 5d states, as well as
the spin-orbit splitting of La-derived states. The QPscGW results are
subsequently used to benchmark several computationally less demanding
techniques including DFT+U, hybrid exchange-correlation functionals, and the
G_0W_0 method. Spin-orbit coupling is included self-consistently at each QPscGW
iteration and maximally localized Wannier functions are used to interpolate
quasi-particle energies. The QPscGW results provide an excellent starting point
for investigating the electronic structure of excited states, charge
self-trapping, and activator ions in LaBr_3 and related materials.Comment: 8 pages, 7 figure
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