265 research outputs found
Development of Off-the-shelf Stent Grafts for Juxtarenal Abdominal Aortic Aneurysms
AbstractIntroductionThe use of EVAR for more complex aneurysm anatomy has become more widespread over the past decade. Fenestrated and branched stent grafts for the visceral and iliac segment show promising short- and midterm outcome and these procedures have become routine in many vascular centers. However, at present, such grafts are customized to the individual patient and planning and manufacturing leads to significant treatment delay subjecting the patients to the risk of rupture during the waiting period. The purpose of this report is to describe the first experience in treating juxta/suprarenal aneurysms using the first version of a new fenestrated stent graftMaterial and MethodsA fenestrated device was designed with two renal fenestrations, an SMA fenestration and a scallop for the coeliac artery. The renal arteries were designed with an inner 6Â mm fenestration and an outer 15Â mm diameter creating a dome to allow renal artery catheterization for a range of renal artery distribution. Seven patients with complex visceral artery anatomy were treated with customized stent grafts containing these pivot renal fenestrations.ResultsTechnical success was uniform with 100% target vessel catheterization and 0% 30-day mortality. In one case, the graft was displaced slightly during delivery resulting in a renal artery stent occlusion at 2 months postoperatively.ConclusionsThe development of a modified fenestrated device has shown this to be feasible and it has the potential to reduce the need for extensive preoperative graft customization and establishing a true off the shelf platform for juxta- and suprarenal AAA
Playful, Curious, Creative, Equitable : Exploring Opportunities for AI Technologies with Older Adults
There has recently been much discussion around OpenAI, Generative AI, use of chatbots and the use of other immersive technologies in the mainstream. These developments have much to offer to older adults in terms of playful, accessible and creative ways to engage with technology in everyday life. In this workshop, we are interested in developing a research agenda for HCI research with older adults to explore, enjoy, build new and extend existing interactions with such technologies. What are the possibilities they offer simply for introducing creativity, playfulness, enjoyment and âfunâ for older adults in everyday life? Or are there other goals that older adults want to achieve using them, such as new ways of socially engaging with their grandchildren, developing hobbies and knowledge, or simply making their lives easier? Can these tools empower older adults to explore various interaction modalities to help them achieve their goals? Finally, what are the new ways that these tools can be used to engage with older adults in the research and design of new emerging technologies? In this workshop, we will aim to generate discussion, develop a community and a roadmap for older adultsâ use of technology that is playful, curious, creative and equitable. We will focus on five themes for the role of such technologies: (i) for enabling expression and creativity, (ii) as a catalyst for experience and action, (iii) for enabling reflection and awareness, (iv) for communication and (v) supporting the design process for (re) inventing new products and avenues for use. This workshop will feature co-creation and exploration of research methods and technologies, with panel and multidisciplinary discussions bringing together researchers who are interested in designing for and with older adults. We will explore new technology interactions including AI and immersive technologies within HCI; discussing methods, opportunities, and challenges in using these technologies and leveraging them for ideation, and form a multidisciplinary community for future synergies and collaborations
Near Horizon Analysis of Extremal AdS5 Black Holes
We study the near horizon geometry of extremal black holes in five
dimensional gauged supergravity using Sen's entropy function formalism. Special
attention is paid to the large black hole limit where the near horizon solution
exhibits a universal dependence on the rotation. The physical properties of the
large black hole solution are shown to agree with predictions from fluid
mechanical description of the dual conformal field theory.Comment: 26 pages, 1 figure; v2. clarifications and references adde
Preparation of iron molybdate catalysts for methanol to formaldehyde oxidation based on ammonium molybdoferrate(II) precursor
It was demonstrated that iron molybdate catalysts for methanol oxidation can be prepared
using Fe(II) as a precursor instead of Fe(III). This would allow for reduction of acidity of
preparation solutions as well as elimination of Fe(III) oxide impurities which are detrimental for
the process selectivity. The system containing Fe(II) and Mo(VI) species in aqueous solution was
investigated using UVâVis spectroscopy. It was demonstrated that three types of chemical reactions
occur in the Fe(II)âMo(VI) system: (i) formation of complexes between Fe(II) and molybdate(VI)
ions, (ii) inner sphere oxidation of coordinated Fe(II) by Mo(VI) and (iii) decomposition of the
FeâMo complexes to form scarcely soluble Fe(III) molybdate, Mo(VI) hydrous trioxide and
molybdenum blue. Solid molybdoferrate(II) prepared by interaction of Fe(II) and Mo(VI) in
solution was characterized by EDXA, TGA, DTA and XRD and a scheme of its thermal evolution
proposed. The iron molybdate catalyst prepared from Fe(II) precursor was tested in methanol-toformaldehyde
oxidation in a continuous flow fixed-bed reactor to show similar activity and
selectivity to the conventional catalyst prepared with the use of Fe(III)
Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV
Results are presented from a search for a W' boson using a dataset
corresponding to 5.0 inverse femtobarns of integrated luminosity collected
during 2011 by the CMS experiment at the LHC in pp collisions at sqrt(s)=7 TeV.
The W' boson is modeled as a heavy W boson, but different scenarios for the
couplings to fermions are considered, involving both left-handed and
right-handed chiral projections of the fermions, as well as an arbitrary
mixture of the two. The search is performed in the decay channel W' to t b,
leading to a final state signature with a single lepton (e, mu), missing
transverse energy, and jets, at least one of which is tagged as a b-jet. A W'
boson that couples to fermions with the same coupling constant as the W, but to
the right-handed rather than left-handed chiral projections, is excluded for
masses below 1.85 TeV at the 95% confidence level. For the first time using LHC
data, constraints on the W' gauge coupling for a set of left- and right-handed
coupling combinations have been placed. These results represent a significant
improvement over previously published limits.Comment: Submitted to Physics Letters B. Replaced with version publishe
Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV
A search for a Higgs boson decaying into two photons is described. The
analysis is performed using a dataset recorded by the CMS experiment at the LHC
from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an
integrated luminosity of 4.8 inverse femtobarns. Limits are set on the cross
section of the standard model Higgs boson decaying to two photons. The expected
exclusion limit at 95% confidence level is between 1.4 and 2.4 times the
standard model cross section in the mass range between 110 and 150 GeV. The
analysis of the data excludes, at 95% confidence level, the standard model
Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The
largest excess of events above the expected standard model background is
observed for a Higgs boson mass hypothesis of 124 GeV with a local significance
of 3.1 sigma. The global significance of observing an excess with a local
significance greater than 3.1 sigma anywhere in the search range 110-150 GeV is
estimated to be 1.8 sigma. More data are required to ascertain the origin of
this excess.Comment: Submitted to Physics Letters
Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV
The Lambda(b) differential production cross section and the cross section
ratio anti-Lambda(b)/Lambda(b) are measured as functions of transverse momentum
pt(Lambda(b)) and rapidity abs(y(Lambda(b))) in pp collisions at sqrt(s) = 7
TeV using data collected by the CMS experiment at the LHC. The measurements are
based on Lambda(b) decays reconstructed in the exclusive final state J/Psi
Lambda, with the subsequent decays J/Psi to an opposite-sign muon pair and
Lambda to proton pion, using a data sample corresponding to an integrated
luminosity of 1.9 inverse femtobarns. The product of the cross section times
the branching ratio for Lambda(b) to J/Psi Lambda versus pt(Lambda(b)) falls
faster than that of b mesons. The measured value of the cross section times the
branching ratio for pt(Lambda(b)) > 10 GeV and abs(y(Lambda(b))) < 2.0 is 1.06
+/- 0.06 +/- 0.12 nb, and the integrated cross section ratio for
anti-Lambda(b)/Lambda(b) is 1.02 +/- 0.07 +/- 0.09, where the uncertainties are
statistical and systematic, respectively.Comment: Submitted to Physics Letters
Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at sqrt(s) = 7 TeV
A search is presented for physics beyond the standard model (BSM) in final
states with a pair of opposite-sign isolated leptons accompanied by jets and
missing transverse energy. The search uses LHC data recorded at a
center-of-mass energy sqrt(s) = 7 TeV with the CMS detector, corresponding to
an integrated luminosity of approximately 5 inverse femtobarns. Two
complementary search strategies are employed. The first probes models with a
specific dilepton production mechanism that leads to a characteristic kinematic
edge in the dilepton mass distribution. The second strategy probes models of
dilepton production with heavy, colored objects that decay to final states
including invisible particles, leading to very large hadronic activity and
missing transverse energy. No evidence for an event yield in excess of the
standard model expectations is found. Upper limits on the BSM contributions to
the signal regions are deduced from the results, which are used to exclude a
region of the parameter space of the constrained minimal supersymmetric
extension of the standard model. Additional information related to detector
efficiencies and response is provided to allow testing specific models of BSM
physics not considered in this paper.Comment: Replaced with published version. Added journal reference and DO
Measurement of isolated photon production in pp and PbPb collisions at sqrt(sNN) = 2.76 TeV
Isolated photon production is measured in proton-proton and lead-lead
collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the
pseudorapidity range |eta|<1.44 and transverse energies ET between 20 and 80
GeV with the CMS detector at the LHC. The measured ET spectra are found to be
in good agreement with next-to-leading-order perturbative QCD predictions. The
ratio of PbPb to pp isolated photon ET-differential yields, scaled by the
number of incoherent nucleon-nucleon collisions, is consistent with unity for
all PbPb reaction centralities.Comment: Submitted to Physics Letters
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