18,028 research outputs found
Detours on the Road to Maturity: A View of the Legal Conception of Growing up and Letting Go
Presents an historical examination of how law has shaped, constrained, and reflected the social role of youth in America. Part 1 surveys the period 1607-1870, part 2 covers the period 1870-1920, and part 3 views the contemporary scene
Expression of Interest ICES/KIS-3 : Thema 4: Hoogwaardig Ruimtegebruik Speerpunt 6
Hoofddoel van dit speerpunt is om zowel de Nederlandse overheid als het bedrijfsleven uit te rusten met een operationele kennisinfrastructuur die toegesneden is op de relatie tussen (antropogene en natuurlijke) klimaatverandering en meervoudig ruimtegebrui
Observations on drought damage to some native plant species in eucalypt forests and woodlands near Hobart, Tasmania
A large number of shrub and tree species suffered damage in the Ridgeway and University Reserves near Hobart, Tasmania during a prolonged drought. Damage was largely confined to shallow soils and gully margins on dolerite, there being little or no damage on equivalent sites on sedimentary substrata. Intraspecific damage was inversely related to the heights of individuals for particular sites. Relative drought resistance is presented diagrammatically for 24 small shrub species and 17 tall shrub and tree species. Drought damage does not directly limit the distribution of most species observed in this study, although the patterns of relative drought resistance accord well with species distribution in respect to available water
Inverse Scattering and Acousto-Optic Imaging
We propose a tomographic method to reconstruct the optical properties of a
highly-scattering medium from incoherent acousto-optic measurements. The method
is based on the solution to an inverse problem for the diffusion equation and
makes use of the principle of interior control of boundary measurements by an
external wave field.Comment: 10 page
YF-12 cooperative airframe/propulsion control system program, volume 1
Several YF-12C airplane analog control systems were converted to a digital system. Included were the air data computer, autopilot, inlet control system, and autothrottle systems. This conversion was performed to allow assessment of digital technology applications to supersonic cruise aircraft. The digital system was composed of a digital computer and specialized interface unit. A large scale mathematical simulation of the airplane was used for integration testing and software checkout
YF-12 Lockalloy ventral fin program, volume 1
Results are presented of the YF-12 Lockalloy Ventral Fin Program which was carried out by Lockheed Aircraft Corporation - Advanced Development Projects for the joint NASA/USAF YF-12 Project. The primary purpose of the program was to redesign and fabricate the ventral fin of the YF-12 research airplane (to reduce flutter) using Lockalloy, and alloy of beryllium and aluminum, as a major structural material. A secondary purpose, was to make a material characterization study (thermodynamic properties, corrosion; fatigue tests, mechanical properties) of Lockalloy to validate the design of the ventral fin and expand the existing data base on this material. All significant information pertinent to the design and fabrication of the ventral fin is covered. Emphasis throughout is given to Lockalloy fabrication and machining techniques and attendant personnel safety precautions. Costs are also examined. Photographs of tested alloy specimens are shown along with the test equipment used
Health sector decentralization and Indonesia ' s nutrition programs : opportunities and challenges
This policy concept paper is intended to assist the center in navigating the tension between opportunities and challenges as activities are adapted to the decentralized national nutrition policy, and to help guide districts and provinces in the conduct o f locally appropriate nutrition programs. The paper synthesizes the findings of an extensive study undertaken by the World Bank with a summary of the results, while the conclusions are discussed in detail in the four annexes. It begins with a review of the accomplishments and remaining nutrition challenges for Indonesia. It then turns to look at the regional diversity in Indonesia ' s nutrition challenges and asks which type of nutrition programs are most cost-effective. The paper concludes with an assessment of the existing institutional arrangement for nutrition service delivery, and discusses steps Indonesia can take to further improve population nutrition and health. The annexes provide extensive data and analysis to shed light on the opportunities and challenges in the new institutional environment.Health Monitoring & Evaluation,Nutrition,Early Child and Children ' s Health,Population Policies,Rural Development Knowledge & Information Systems
The influence of gas expulsion and initial mass-segregation on the stellar mass-function of globular star clusters
Recently de Marchi, Paresce & Pulone (2007) studied a sample of twenty
globular clusters and found that all clusters with high concentrations have
steep stellar mass-functions while clusters with low concentration have
comparatively shallow mass-functions. No globular clusters were found with a
flat mass-function and high concentration. This seems curious since more
concentrated star clusters are believed to be dynamically more evolved and
should have lost more low-mass stars via evaporation, which would result in a
shallower mass-function in the low-mass part.
We show that this effect can be explained by residual-gas expulsion from
initially mass-segregated star clusters, and is enhanced further through
unresolved binaries. If gas expulsion is the correct mechanism to produce the
observed trend, then observation of these parameters would allow to constrain
cluster starting conditions such as star formation efficiency and the
time-scale of gas expulsion.Comment: accepted for publication in MNRAS, 10 pages, 6 figure
Identification of Hemodynamically Optimal Coronary Stent Designs Based on Vessel Caliber
Coronary stent design influences local patterns of wall shear stress (WSS) that are associated with neointimal growth, restenosis, and the endothelialization of stent struts. The number of circumferentially repeating crowns NC for a given stent de- sign is often modified depending on the target vessel caliber, but the hemodynamic implications of altering NC have not previously been studied. In this investigation, we analyzed the relationship between vessel diameter and the hemodynamically optimal NC using a derivative-free optimization algorithm coupled with computational fluid dynamics. The algorithm computed the optimal vessel diameter, defined as minimizing the area of stent-induced low WSS, for various configurations (i.e., NC) of a generic slotted-tube design and designs that resemble commercially available stents. Stents were modeled in idealized coronary arteries with a vessel diameter that was allowed to vary between 2 and 5 mm. The results indicate that the optimal vessel diameter increases for stent configurations with greater NC, and the designs of current commercial stents incorporate a greater NC than hemodynamically optimal stent designs. This finding suggests that reducing the NC of current stents may improve the hemodynamic environment within stented arteries and reduce the likelihood of excessive neointimal growth and thrombus formation
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