10,801 research outputs found
Missing Women and Bare Branches: Gender Balance and Conflict
The emerging subfield of âsecurity demographicsâ examines the linkages between population dynamics and the security trajectories of nation-states. For the last 5 to 10 years, researchers have examined the security aspects of such topics as the demographic transition, the sub-replacement birth rates of developed economies, the proportion of young men as compared to older men in the population, the effects of legal and illegal immigration, and the effects of pandemics such as AIDS and drug-resistant tuberculosis.
This paper aims to add the variable of gender balance to the discussion: are societies with an abnormal ratio between men and women less secure
TMD evolution and the Higgs transverse momentum distribution
The effect of the linear polarization of gluons on the transverse momentum
distribution in Higgs production is studied within the framework of TMD
factorization. For this purpose we consider the TMD evolution for general
colorless scalar boson production, from the lower mass -even scalar
quarkonium states and to the Higgs mass scale. In the
absence of an intrinsic nonperturbative linearly polarized gluon distribution
the results correspond to the CSS formalism, indicating a rather rapid decrease
with increasing energy scale. At the Higgs mass scale the contribution from
linearly polarized gluons is in this case found to be on the percent level,
somewhat larger than an earlier finding in the literature. At the lower mass
scale of quarkonium states and we find contributions at
the 15-70% level, albeit with considerable uncertainty. In the presence of an
intrinsic linear gluon polarization, percent level effects are also found at
the Higgs mass scale, but with a considerably slower evolution. Although these
results were obtained using a model for the TMDs that are approximately
Gaussian at small transverse momenta and have the correct perturbative power
law fall off at large transverse momenta, it illustrates well the differences
that can exist between results obtained from a TMD formalism as compared to a
CSS formalism. The behavior of the TMDs at small can affect the results
for all transverse momenta of the produced boson, even for a particle as heavy
as the Higgs. The TMD evolution from to may be used to
constrain the nonperturbative contributions and improve on the prediction of
the effect at the Higgs mass scale.Comment: 12 pages, 5 figures, minor additions, matches version accepted for
publication in Nuclear Physics
The development of a resource-efficient photovoltaic system
This paper presents the measures taken in the demonstration of the photovoltaic case study developed within the European project âTowards zero waste in industrial networksâ (Zerowin), integrating the D4R (Design for recycling, repair, refurbishment and reuse) criteria at both system and industrial network level. The demonstration is divided into three phases. The first phase concerns the development of a D4R photovoltaic concept, the second phase focused on the development of a specific component of photovoltaic systems and the third phase was the demonstration of the D4R design in two complete photovoltaic systems (grid-connected and stand-alone). This paper includes a description of the installed photovoltaic systems, including a brief summary at component level of the lithium ion battery system and the D4R power conditioning system developed for the pilot installations. Additionally, industrial symbioses within the network associated with the photovoltaic systems and the production model for the network are described
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