24,200 research outputs found
Fabrication techniques for organic electrolyte battery
Experiments in fabrication and testing of silver chloride electrodes for use in organic electrolyte batteries are discussed. Electrodes were fabricated by pelletizing, sintering, hot press binding, and paste binding silver chloride on expanded metal grids of nickel or silver. Each technique was investigated by statistically designed factorial experiment
Electrical and infrared properties of thin niobium microbolometers near T(sub c)
Niobium microbolometers approximately 1 micron wide x 2 micron long x 10 nm thick have been integrated at the feeds of equiangular spiral antennas made of 200 nm thick Nb. The device's current-voltage characteristics and infrared responsivity as a function of DC bias voltage were measured over a range of temperature spanning approximately plus or minus 2 percent around T(sub c). The greatest voltage responsivity occurs well below T(sub c), in a regime where the I-V curve is significantly hysteretic due to self-heating and resembles the I-V curve of a superconducting microbridge
Bulletin No.1: Drug Policy - Mapping structures and enhancing processes
We understand very little about how research informs policy and how to improve that process, especially in highly politicised areas such as illicit drugs. One aim of DPMP is to significantly increase production of the highest quality evidence, which takes complexities and dynamic interactions into account. For this evidence to impact on Australian policy, we need to better understand how policy is made; the kinds of research that are most valued; and how research is best inserted into policy processes. Lack of appreciation of how policies are made is a major barrier to providing good decision support resources and processes.
While we do not subscribe to a naïve view that research should be the only, or even the most important, factor in policy making, we are keen to see research assume its proper role and, within that, to be maximally effective. Surprisingly, there has been relatively little examination of what ‘evidence-informed’ policy is, in drugs, public health, criminal justice or more broadly. There has also been very limited research to shine a light on the collective experience of policy making in an attempt to learn from that experience, so that we may pursue it more wisely in the future
The Influence of Formulation, Buffering, pH and Divalent Cations on the Activity of Endothall on Hydrilla.
Endothall has been used as an aquatic herbicide for more
than 40 years and provides very effective weed control of
many weeds. Early research regarding the mechanism-of-action
of endothall contradicts the symptomology normally associated
with the product. Recent studies suggest endothall
is a respiratory toxin but the mechanism-of-action remains
unknown. To further elucidate the activity of endothall, several
endothall formulations were evaluated for their effects
on ion leakage, oxygen consumption and photosynthetic oxygen
evolution from hydrilla shoot tips. The influence of pH,
buffering and divalent cations was also evaluated. (PDF contains 6 pages.
Whole-mount techniques to evaluate subepithelial cellular populations in the adult mouse intestine
Bosenova and three-body loss in a Rb-85 Bose-Einstein condensate
Collapsing Bose-Einstein condensates are rich and complex quantum systems for
which quantitative explanation by simple models has proved elusive. We present
new experimental data on the collapse of high density Rb-85 condensates with
attractive interactions and find quantitative agreement with the predictions of
the Gross-Pitaevskii equation. The collapse data and measurements of the decay
of atoms from our condensates allow us to put new limits on the value of the
Rb-85 three-body loss coefficient K_3 at small positive and negative scattering
lengths.Comment: 6 pages, 5 figure
Agent-Based Modeling and its Tradeoffs: An Introduction & Examples
Agent-based modeling is a computational dynamic modeling technique that may
be less familiar to some readers. Agent-based modeling seeks to understand the
behaviour of complex systems by situating agents in an environment and studying
the emergent outcomes of agent-agent and agent-environment interactions. In
comparison with compartmental models, agent-based models offer simpler, more
scalable and flexible representation of heterogeneity, the ability to capture
dynamic and static network and spatial context, and the ability to consider
history of individuals within the model. In contrast, compartmental models
offer faster development time with less programming required, lower
computational requirements that do not scale with population, and the option
for concise mathematical formulation with ordinary, delay or stochastic
differential equations supporting derivation of properties of the system
behaviour. In this chapter, basic characteristics of agent-based models are
introduced, advantages and disadvantages of agent-based models, as compared
with compartmental models, are discussed, and two example agent-based
infectious disease models are reviewed
Helmholtz solitons in optical materials with a dual power-law refractive index
A nonlinear Helmholtz equation is proposed for modelling scalar optical beams in uniform planar waveguides whose refractive index exhibits a purely-focusing dual powerlaw
dependence on the electric field amplitude. Two families of exact analytical solitons, describing forward- and backward-propagating beams, are derived. These solutions are
physically and mathematically distinct from those recently discovered for related nonlinearities. The geometry of the new solitons is examined, conservation laws are reported,
and classic paraxial predictions are recovered in a simultaneous multiple limit. Conventional semi-analytical techniques assist in studying the stability of these nonparaxial solitons, whose propagation properties are investigated through extensive simulations
Z(2)-Singlino Dark Matter in a Portal-Like Extension of the Minimal Supersymmetric Standard Model.
We propose a Z2-stabilized singlino () as a dark matter candidate in extended and R-parity violating versions of the supersymmetric standard model. interacts with visible matter via a heavy messenger field S, which results in a supersymmetric version of the Higgs portal interaction. The relic abundance of can account for cold dark matter if the messenger mass satisfies GeV. Our model can be implemented in many realistic supersymmetric models such as the next-to-minimal supersymmetric (SUSY) standard model and nearly minimal SUSY standard model
- …