8,277 research outputs found
OS diversity for intrusion tolerance: Myth or reality?
One of the key benefits of using intrusion-tolerant systems is the possibility of ensuring correct behavior in the presence of attacks and intrusions. These security gains are directly dependent on the components exhibiting failure diversity. To what extent failure diversity is observed in practical deployment depends on how diverse are the components that constitute the system. In this paper we present a study with operating systems (OS) vulnerability data from the NIST National Vulnerability Database. We have analyzed the vulnerabilities of 11 different OSes over a period of roughly 15 years, to check how many of these vulnerabilities occur in more than one OS. We found this number to be low for several combinations of OSes. Hence, our analysis provides a strong indication that building a system with diverse OSes may be a useful technique to improve its intrusion tolerance capabilities
Maxwell-Chern-Simons vortices in a CPT-odd Lorentz-violating Higgs Electrodynamics
We have studied BPS vortices in a CPT-odd and Lorentz-violating
Maxwell-Chern-Simons-Higgs (MCSH) electrodynamics attained from the dimensional
reduction of the Carroll-Field-Jackiw-Higgs model. The Lorentz-violating
parameter induces a pronounced behavior at origin (for the magnetic/electric
fields and energy density) which is absent in the MCSH vortices. For some
combination of the Lorentz-violating coefficients there always exist a
sufficiently large winding number such that for all
the magnetic field flips its signal, yielding two well defined regions with
opposite magnetic flux. However, the total magnetic flux remains quantized and
proportional to the winding number.Comment: Revtex style, 8 page
A 3-form Gauge Potential in 5D in connection with a Possible Dark Sector of 4D-Electrodynamics
We here propose a 5-dimensional {\bf Abelian gauge} model based on the mixing
between a potential and an Abelian 3-form field by means of a
topological mass term. An extended covariant derivative is introduced to
minimally couple a Dirac field to the potential, while this same
covariant derivative non-minimally couples the 3-form field to the charged
fermion. A number of properties are discussed in 5D; in particular, the
appearance of a topological fermionic current. A 4-dimensional reduced version
of the model is investigated and, { \bf in addition to the electric- and
magnetic-sort of fields,} there emerges an extra set of electric- and
magnetic-like fields which contribute a negative pressure and may be identified
as a possible fraction of dark energy. The role of the topological fermionic
current is also contemplated upon dimensional reduction from 5D to 4D. Other
issues we present in 4 space-time dimensions are the emergence {\bf of a
pseudo-scalar massive particle,} an extra massive neutral gauge boson,{\bf
which we interpret as a kind of paraphoton}, and the calculation of spin- and
velocity-dependent interparticle potentials associated to the exchange of the
intermediate bosonic fields of the model.Comment: -- 30 pages -- L. P. R. Ospedal appears as a new co-author;
modifications by inclusion of the gravitational sector and the attainment of
a spin- and velocity-dependent potential as an application have been worked
out in this Revised Versio
Bibliografia de tecnologia do látex e da borracha de seringueira.
Levantamento bibliografico relativo a borracha natural e latex da seringueira, composto de 1174 referencias nacionais e internacionais, colocado a disposicao de todos os interessados.bitstream/item/210615/1/Bibliografia-de-tecnologia-do-latex-completo.pd
Electrospinning : processing technique for tissue engineering scaffolding
Electrospinning has attracted tremendous interest in the research community as a simple and
versatile technique to produce synthetic polymeric ultrafine fibres with diameters ranging from a
few micrometres to tens of nanometres. Recently, some natural origin polymers have also been
successfully electrospun. Owing to their very small diameter, polymeric nanofibres exhibit
unusual properties such as high specific surface area, flexibility in surface functionalities and
superior mechanical properties. In addition, electrospun non-woven meshes could physically
mimic the extracellular matrix structure of native tissues. These remarkable properties render
electrospun nanofibres useful for many applications, particularly those related to the field of
biomedical engineering. The first part of this review is intended to provide a fundamental survey
of the electrospinning process (apparatus, governing parameters) and of recent improvements of
the technique, including associated structural modifications of polymeric nanofibre meshes. The
prospective tissue engineering/biomedical applications of electrospun polymeric nanofibres are
then reviewed, namely, wound dressings, medical prostheses, drug delivery systems, DNA
release and tissue engineering scaffolds. The essential properties of scaffolds in terms of the
structural features of electrospun nanofibre meshes are discussed. Finally, the future
perspectives for applications of electrospun nanofibres, particularly in the field of tissue
engineering, are considered
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