4,300 research outputs found
Down to Earth: A Practical Guide for Mine Action and Development Interventions
The purpose of this guide is to provide practical guidance for both mine action and development practitioners that wish to empower mine-affected populations to overcome poverty and participate more equally on socio-economic and political grounds in society.
This guide is intended for use by both mine action and development stakeholders that are interested in applying a development approach to complement existing mine action interventions
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Designing Waste Creating Space: A Critical Examination Into Waste Reduction Through Building Techniques, Architectural Design, and Systems
Can we design waste? This is a question I seek to answer through the research of design and systems. Waste is an ever evolving and growing issue in our world today. Buildings and the spaces we inhabit contribute to the vast destruction and increasing detriment to our natural world. There are many “remedies” in the construction industry that attempt to regulate building waste and inspire sustainability, but are merely ruses for a much deeper rooted problem than sustaining the way we live. Sustainability is not enough, it simply means we are doing less bad while still perpetuating the problem of waste. Design, architecture, and construction must go beyond this to eradicate the issue; producing “less” waste is not a solution, but a redefining of the essence in which we live is a mandate.
This thesis seeks to explore the conundrum of waste through the lens of design. This thesis will study systems as a tool for waste remediation and regeneration. It will explore and scrutinize both building systems such as HVAC and energy efficiency as well as space making systems, scenario based, environmental, sociological, and economical systems, all which have an important and integral impact on design, our environment, and the human population.
To answer the question, can we design waste, we must redefine our lives and the systems that propel us habitually in the ways we make, produce, work, eat, and live. Moving away from systems of simplicity to those of diversity and complexity. To do this we must re-examine new and existing systems from socioeconomic to the natural cycles of rain water and evaporation. We must re-define the way we live, on all levels, from how we live and what we use to what we actually need to survive happily and harmoniously with ourselves and our planet. The key – Design
Binaries among Ap and Am stars
The results of long-term surveys of radial velocities of cool Ap and Am stars
are presented. There are two samples, one of about 100 Ap stars and the other
of 86 Am stars. Both have been observed with the CORAVEL scanner from
Observatoire de Haute-Provence (CNRS), France.
The conspicuous lack of short-period binaries among cool Ap stars seems
confirmed, although this may be the result of an observational bias; one system
has a period as short as 1.6 days. A dozen new orbits could be determined,
including that of one SB2 system. Considering the mass functions of 68 binaries
from the literature and from our work, we conclude that the distribution of the
mass ratios is the same for the Bp-Ap stars than for normal G dwarfs.
Among the Am stars, we found 52 binaries, i.e. 60%; an orbit could be
computed for 29 of them. Among these 29, there are 7 SB2 systems, one triple
and one quadruple system. The 21 stars with an apparently constant radial
velocity may show up later as long-period binaries with a high eccentricity.
The mass functions of the SB1 systems are compatible with cool main-sequence
companions, also suggested by ongoing spectral observations.Comment: 5 pages, 2 figures, to appear in: Proc. of the 26th workshop of the
European Working Group on CP stars, Contrib. Astr. Obs. Skalnate Pleso Vol.
27, No
Spatial Multiplexing of QPSK Signals with a Single Radio: Antenna Design and Over-the-Air Experiments
The paper describes the implementation and performance analysis of the first
fully-operational beam-space MIMO antenna for the spatial multiplexing of two
QPSK streams. The antenna is composed of a planar three-port radiator with two
varactor diodes terminating the passive ports. Pattern reconfiguration is used
to encode the MIMO information onto orthogonal virtual basis patterns in the
far-field. A measurement campaign was conducted to compare the performance of
the beam-space MIMO system with a conventional 2-by-?2 MIMO system under
realistic propagation conditions. Propagation measurements were conducted for
both systems and the mutual information and symbol error rates were estimated
from Monte-Carlo simulations over the measured channel matrices. The results
show the beam-space MIMO system and the conventional MIMO system exhibit
similar finite-constellation capacity and error performance in NLOS scenarios
when there is sufficient scattering in the channel. In comparison, in LOS
channels, the capacity performance is observed to depend on the relative
polarization of the receiving antennas.Comment: 31 pages, 23 figure
Searching for solar-like oscillations in the delta Scuti star rho Puppis
Despite the shallow convective envelopes of delta Scuti pulsators, solar-like
oscillations are theoretically predicted to be excited in those stars as well.
To search for such stochastic oscillations we organised a spectroscopic
multi-site campaign for the bright, metal-rich delta Sct star rho Puppis. We
obtained a total of 2763 high-resolution spectra using four telescopes. We
discuss the reduction and analysis with the iodine cell technique, developed
for searching for low-amplitude radial velocity variations, in the presence of
high-amplitude variability. Furthermore, we have determined the angular
diameter of rho Puppis to be 1.68 \pm 0.03 mas, translating into a radius of
3.52 \pm 0.07Rsun. Using this value, the frequency of maximum power of possible
solar-like oscillations, is expected at ~43 \pm 2 c/d (498 \pm 23 muHz). The
dominant delta Scuti-type pulsation mode of rho Puppis is known to be the
radial fundamental mode which allows us to determine the mean density of the
star, and therefore an expected large frequency separation of 2.73 c/d (31.6
muHz). We conclude that 1) the radial velocity amplitudes of the delta Scuti
pulsations are different for different spectral lines; 2) we can exclude
solar-like oscillations to be present in rho Puppis with an amplitude per
radial mode larger than 0.5 m/s.Comment: 14 pages, 12 figure, accepted for MNRA
Velocity Curve Analysis of the Spectroscopic Binary Stars V373 Cas, V2388 Oph, V401 Cyg, GM Dra, V523 Cas, AB And, and HD 141929 by Artificial Neural Networks
We used an Artificial Neural Network (ANN) to derive the orbital parameters
of spectroscopic binary stars. Using measured radial velocity data of seven
double-lined spectroscopic binary systems V373 Cas, V2388 Oph, V401 Cyg, GM
Dra, V523 Cas, AB And, and HD 141929, we found corresponding orbital and
spectroscopic elements. Our numerical results are in good agreement with those
obtained by others using more traditional methods.Comment: 13 pages, 8 figures, 14 Table
Analysis of complex singularities in high-Reynolds-number Navier-Stokes solutions
Numerical solutions of the laminar Prandtl boundary-layer and Navier-Stokes
equations are considered for the case of the two-dimensional uniform flow past
an impulsively-started circular cylinder. We show how Prandtl's solution
develops a finite time separation singularity. On the other hand Navier-Stokes
solution is characterized by the presence of two kinds of viscous-inviscid
interactions that can be detected by the analysis of the enstrophy and of the
pressure gradient on the wall. Moreover we apply the complex singularity
tracking method to Prandtl and Navier-Stokes solutions and analyze the previous
interactions from a different perspective
Brief of Amici Curiae 65 Professors of Law, Business, Economics, and Sports Management in Support of Respondents
The Alston plaintiffs are college athletes who successfully challenged the NCAA\u27s amateurism rules, convincing the lower courts that the rules should be modestly relaxed to limit their effect on competition for athletic talent. Nearly 60 professors of law, business, and economics from around the country joined the brief
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