4,378 research outputs found
A planar calculus for infinite index subfactors
We develop an analog of Jones' planar calculus for II_1-factor bimodules with
arbitrary left and right von Neumann dimension. We generalize to bimodules
Burns' results on rotations and extremality for infinite index subfactors.
These results are obtained without Jones' basic construction and the resulting
Jones projections.Comment: 56 pages, many figure
Weak Riemannian manifolds from finite index subfactors
Let be a finite Jones' index inclusion of II factors, and
denote by their unitary groups. In this paper we study the
homogeneous space , which is a (infinite dimensional) differentiable
manifold, diffeomorphic to the orbit
of the Jones projection of the inclusion. We endow with a
Riemannian metric, by means of the trace on each tangent space. These are
pre-Hilbert spaces (the tangent spaces are not complete), therefore is a weak Riemannian manifold. We show that enjoys certain
properties similar to classic Hilbert-Riemann manifolds. Among them, metric
completeness of the geodesic distance, uniqueness of geodesics of the
Levi-Civita connection as minimal curves, and partial results on the existence
of minimal geodesics. For instance, around each point of ,
there is a ball (of uniform radius ) of
the usual norm of , such that any point in the ball is joined to
by a unique geodesic, which is shorter than any other piecewise smooth curve
lying inside this ball. We also give an intrinsic (algebraic) characterization
of the directions of degeneracy of the submanifold inclusion , where the last set denotes the Grassmann manifold
of the von Neumann algebra generated by and .Comment: 19 page
Isotopic evidence for biogenic molecular hydrogen production in the Atlantic Ocean
Oceans are a net source of molecular hydrogen (H2) to the atmosphere. The production of marine H2 is assumed to be mainly biological by N2 fixation, but photochemical pathways are also discussed. We present measurements of mole fraction and isotopic composition of dissolved and atmospheric H2 from the southern and northern Atlantic between 2008 and 2010. In total almost 400 samples were taken during five cruises along a transect between Punta Arenas (Chile) and Bremerhaven (Germany), as well as at the coast of Mauretania.
The isotopic source signatures of dissolved H2 extracted from surface water are highly deuterium-depleted and correlate negatively with temperature, showing δD values of (−629 ± 54) ‰ for water temperatures at (27 ± 3) °C and (−249 ± 88) ‰ below (19 ± 1) °C. The results for warmer water masses are consistent with biological production of H2. This is the first time that marine H2 excess has been directly attributed to biological production by isotope measurements. However, the isotope values obtained in the colder water masses indicate that beside possible biological production a significant different source should be considered.
The atmospheric measurements show distinct differences between both hemispheres as well as between seasons. Results from the global chemistry transport model TM5 reproduce the measured H2 mole fractions and isotopic composition well. The climatological global oceanic emissions from the GEMS database are in line with our data and previously published flux calculations. The good agreement between measurements and model results demonstrates that both the magnitude and the isotopic signature of the main components of the marine H2 cycle are in general adequately represented in current atmospheric models despite a proposed source different from biological production or a substantial underestimation of nitrogen fixation by several authors
Microbiological Valorisation of Bio-composites Based on Polylactic Acid and Wood Fibres
The use of wood fibres for production of bio-based composites has attracted interest in various application
sectors ranging from packaging to automotive components and in other high value applications. In the course
of the present research activity, several bio-based composites were developed using wood fibres with a
compostable polymeric matrix such as polylactic acid (PLA) and a flexible biodegradable polymer such as
poly(butylene adipate-co-terephthalate) (PBAT). The developed materials were used for the manufacture of
several prototypes for food packaging (trays, boxes for refrigerated or frozen fish, egg box), agricultural
applications (pots and yarns), automotive components (spoiler and seats) as well as containers for cosmetics
and chemicals. Biodegradability and compostability are desired properties, allowing bio-recycling as end of life
scenario, mainly for materials used in food packaging and agricultural applications. Thus, they may be
recycled at the end of their life time service producing compost as a value-added by-product. Composting is
the main option for bio-recycling but also other valuable pathways can be pursued. Because lignocellulose is
one of the components of developed materials, several by-products such as enzymes, reducing sugars,
proteins, amino acids, carbohydrates, organic acids, etc. may be obtained from the bio-composites produced.
Alternatively, the bio-composites can be also used for the production of yeast biomass. This is important as
another recyclability way of the new produced materials. In the present research the bio-composites produced
were investigated as substrates for the production of the methylotrophic yeast Pichia pastoris, a potential
source of single-cell protein (SCP), β-carotene, and Rhodotorula sp. as potential source of food and feed
grade colorant. This is another more valuable alternative to the composting considering also that composting
cannot be used to dispose of large quantities of bio-plastics, and in the future it will become more and more
important to find alternative routes of valorisation for bio-plastics disposal
Fragmentation studies of high energy ions using CR39 nuclear track detectors
We report on the measurements of the total charge changing fragmentation
cross sections in high-energy nucleus-nucleus collisions using Fe, Si and Pb
incident ions. Several stacks of CR39 nuclear track detectors with different
target combinations were exposed at normal incidence to high energy accelerator
beams to integrated densities of about 2000 ions/cm^2. The nuclear track
detector foils were chemically etched, and ion tracks were measured using an
automatic image analyzer system. The cross section determination is based on
the charge identification of beam ions and their fragments and on the
reconstruction of their path through the stacks.Comment: 5 pages, 4 EPS figures. Corrected Eq. 3 and Table 1. Presented at the
10th Inter. Symp. Radiat. Phys., Coimbra, Portugal, 17-22 Sept. 200
Fournier's gangrene: summary of 8 years of clinical experience
Catedra Chirugie nr.1 „N.Anestiadi”, USMF „Nicolae Testemiţanu”, Spitalul „Sf.Arhanghel Mihail”, Chişinau, Republica
Moldova, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: Gangrena Fournier este o fasciită necrozantă care implică zona genitală şi perineul, progresează spre coapse şi
peretele abdominal prin trabeculele fasciale.
Material şi metode: Experienţa noastră include opt pacienţi cu gangrena Fournier, trataţi pe parcursul anilor 2006-2014.
Repartizarea după sex a fost: 5 femei şi 3 bărbaţi. În etiologia bolii putem evidenţia calea ano-rectală (2 cazuri), infecţia urogenitală
(3 cazuri) şi infecţia pielii (3 cazuri). Diagnosticul a fost stabilit în baza tabloulului clinic şi examenului ultrasonor. Toţi
pacienţii au beneficiat de debridare chirurgicală radicală imediată, necrozectomii seriate, antibioticoterapia combinată şi terapie
intensivă. Numărul de operaţii seriate a variat de la 4 până la 13.
Rezultate: În urma tratamentului efectuat am obţinut stoparea procesului de necroză la 7 pacienţi. Doi pacienţi au evoluat spre
septicemie cu hemocultură pozitivă. La un pacient sa dezvoltat şocul toxico-infecţios. Analiza bacteriologică din plagă a
determinat: Staphylococcus aureus (2 cazuri), Enterococcus faecium (un caz), Escherichia coli (2 cazuri), floră mixtă (3 cazuri).
Mortalitatea a fost de 37,5%.
Concluzii: Stabilirea precoce a diagnosticului şi debridarea primară imediată urmată de necrozectomii etapizate stau la baza
evoluţiei favorabile a procesului necrotico-septic. Antibioticoterapia efectuată prin asocierea a 3 antibiotice cu diferit spectru de
acţiune împiedică răspândirea procesului putrid şi generalizarea infecţiei. Mortalitatea înaltă în gangrena Fournier este dic tată
de insuccesele terapiei intensive în stările septice avansate cu comorbidităţi severe, în pofida metodelor contemporane de
tratament chirurgical.Introduction: Fournier's gangrene is a necrotizing fasciitis which involves the genitals regions and perineum, spreading to
thighs and abdominal wall through fascial trabeculae.
Material and methods: Our experience includes eight patients with Fournier's gangrene treated during 2006-2014. Distribution
by gender: 5 women and 3 men. In the etiology of the disease we can highlight ano-rectal way (2 cases), urogenital infection (3
cases) and skin infection (3 cases). The diagnosis was based on clinical features and ultrasound exam. All patients underwent
immediate radical surgical debridement, serial necrosectomy, combined antibiotic therapy and intensive care. Number of serial
operations ranged from 4 to 13.
Results: After the provided treatment we were able to stop the process of necrosis in 7 patients. Two patients progressed to
sepsis with positive blood test. Toxico-infectious shock was present in one patient. Bacteriological analysis showed:
Staphylococcus aureus (2 cases), Enterococcus faecium (one case), Escherichia coli (2 cases), and mixed flora (3 cases).
Mortality was 37.5%.
Conclusions: Early diagnosis establishment and immediate primary debridement followed by serial necrosectomy is the base
of the favourable evolution of the necrotic septic process. Antibacterial therapy carried out by the association with 3 different
action spectrum antibiotics prevent the spread of the putrid process and generalized of infection. High mortality in Fournier's
gangrene is a consequence of failures in intensive care in advanced sepsis with severe comorbidities, in spite of the
contemporary methods of the surgical treatment
thermodynamic properties of pb3u11o36
Abstract In order to progress in the development of Lead-cooled Fast Reactors, from the safety point of view it is essential to understand the chemical compatibility between liquid lead and uranium oxide. In the present work, entropy and heat capacity of Pb3U11O36, a possible ternary compound coming from fuel-coolant chemical interaction, were determined for the first time. Entropy at 298.15 K was obtained from low temperature heat capacity measurements using the Physical Property Measurement System (PPMS) in the temperature range 2–300 K, while the high temperature heat capacity has been measured by a drop calorimeter from 373 K to 1200 K. The experimental thermodynamic properties were compared with the values computed by means of DFT-GGA simulations, obtaining a very good agreement
Lectures on BCOV holomorphic anomaly equations
The present article surveys some mathematical aspects of the BCOV holomorphic
anomaly equations introduced by Bershadsky, Cecotti, Ooguri and Vafa. It grew
from a series of lectures the authors gave at the Fields Institute in the
Thematic Program of Calabi-Yau Varieties in the fall of 2013.Comment: reference added, typos correcte
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