9,157 research outputs found
Rotating 5D-Kaluza-Klein Space-Times from Invariant Transformations
Using invariant transformations of the five-dimensional Kaluza-Klein (KK)
field equations, we find a series of formulae to derive axial symmetric
stationary exact solutions of the KK theory starting from static ones. The
procedure presented in this work allows to derive new exact solutions up to
very simple integrations. Among other results, we find exact rotating solutions
containing magnetic monopoles, dipoles, quadripoles, etc., coupled to scalar
and to gravitational multipole fields.Comment: 24 pages, latex, no figures. To appear in Gen. Rel. Grav., 32,
(2000), in pres
Oscillatons revisited
In this paper, we study some interesting properties of a spherically
symmetric oscillating soliton star made of a real time-dependent scalar field
which is called an oscillaton. The known final configuration of an oscillaton
consists of a stationary stage in which the scalar field and the metric
coefficients oscillate in time if the scalar potential is quadratic. The
differential equations that arise in the simplest approximation, that of
coherent scalar oscillations, are presented for a quadratic scalar potential.
This allows us to take a closer look at the interesting properties of these
oscillating objects. The leading terms of the solutions considering a quartic
and a cosh scalar potentials are worked in the so called stationary limit
procedure. This procedure reveals the form in which oscillatons and boson stars
may be related and useful information about oscillatons is obtained from the
known results of boson stars. Oscillatons could compete with boson stars as
interesting astrophysical objects, since they would be predicted by scalar
field dark matter models.Comment: 10 pages REVTeX, 10 eps figures. Updated files to match version
published in Classical and Quantum Gravit
Majocchi’s Granuloma by Trichophytum rubrum in a kidney transplant patient - A case report
Introduction: Trichophytum rubrum is a filamentous fungus, with worldwide distribution, that usually causes
superficial infections of skin and nails, namely tinea pedis, tinea corporis, tinea cruris and onychomycosis.
Rarely, severe dermatophytosis can occur, presenting as deep dermatophytosis, Majocchi’s Granuloma or
extensive dermatophytosis.
Objectives and Methods: Case report of Majocchi’s Granuloma in a kidney transplant patient.
Results: A case of a 55-year-old woman who underwent a kidney transplant 7 months before, under
immunosuppressive therapy with tacrolimus and mycophenolate mofetil. She attended a Dermatology
consultation to clarify skin lesions that appeared 6 months earlier. The skin exam revealed hard and painful
plaque lesions on both legs, with an ulcer on the left leg lesion, violaceous papular lesions on the dorsum of
the left foot and toes and a hard consistency nodule on the left leg. Some of the toe nails presented dystrophy
or onycholysis. The patient denied any previous trauma or contact with plants or soil.
Biopsies of lesions of the left leg and foot dorsum where sent for histology and mycological culture and toe
nails for mycological culture. The histological examinations showed, in the reticular dermis and reaching the
hypodermis, suppurative granulomas with multinucleated giant cells and areas of necrosis. PAS (Periodic Acid-
Schiff) and GMS (Grocott’s Methenamine Silver) staining revealed multiple spores and septate hypha within the
granulomas but not in the stratum corneum. No remnants of hair follicles where found.
Culture of skin biopsies were positive for Tricophytum rubrum but nails´ culture was negative.
Identification was further confirmed by sequencing of ITS region of ribosomal DNA (GenBank accession
number MK967277).
Oral Itraconazole 100mg bid and topic Sertoconazole where initiated. The patient was observed one month
after and reported general malaise, tiredness, exertional dyspnea, whitish stools and increased abdominal
volume. The physician chose to discontinue itraconazole and initiate oral terbinafine 250mg id. After two
months on oral terbinafine, there was regression of the legs´ and left foot lesions with ulcer healing and
disappearance of the left leg nodule.
Conclusion: Diagnosis of deeper dermatophytosis is difficult, in part because there is no specific clinical
presentation and, in many cases, it is even polymorphic. However, especially in patients with
immunodeficiency, this hypothesis should be weighed. Confirmation is achieved by finding hyphae compatible
with dermatophytes in the dermis and a positive culture for a dermatophyte.
Treatment should include systemic antifungal agents, to which topical medication may be associated. Multiple
therapeutic regimens have been proposed, but randomized trials or large case series are lacking. Antifungal
therapy should be continued until the lesions are completely resolved. Surgical treatment has been reported as
an option for highly localized lesions.info:eu-repo/semantics/publishedVersio
The use of ultrasonography in the perioperative management of penetrating chest trauma with indwelling blade
We report on the anaesthetic and postoperative analgesic management of a patient presenting with a single penetrating thoracic injury, with radiological confirmation of a foreign object still present in the thorax. The patient underwent an emergency right posterolateral thoracotomy. We discuss the use of ultrasound for the insertion of a paravertebral catheter for perioperative analgesic management, and its efficacy in the emergency setting. Furthermore, we discuss the use of perioperative focus assessed transthoracic echocardiography, which had a positive impact on our management, although the case highlights the need for further large multi-centre trials.Keywords: focus assessed transthoracic echocardiography (FATE), paraverterbral block, penetrating thoracic injury, thoracotomy, ultrasound-guided regional anaesthesi
Interação genótipo-ambiente em bovinos: revisão de estudos no Brasil.
bitstream/item/31742/1/Doc-365.pdfVersão eletrônica disponÃvel em papel
Test Case 4: dual band transmit-array
In this report a numerical solution for the dual band transmit-array challegenge proposed for the WORKSHOP EM-ISAE 2018 (test case nº 4) is presented. The numerical results are compared with the measurements of the corresponding prototype (see Figure 1). More details about the design and fabrication processes of the dual band TA can be found in [1]. To perform the corresponding full-wave simulations was quite challenging, mainly due to the large volume occupied by the antenna (comprising the feed and lens) and the fine subwavelength details of the unit cells that populate the TA. In fact, we did not had at that time sufficient memory to perform the full-wave simulation of the complete antenna (feed+lens). In this workshop we detailed the developed approach used to conduct the full-wave analysis of the TA within our available computational resources.info:eu-repo/semantics/acceptedVersio
Asymmetric band diagrams in photonic crystals with a spontaneous nonreciprocal response
We study the propagation of electromagnetic waves in layered photonic crystals formed by materials with a spontaneous nonreciprocal response, such as Tellegen (axion) media or topological insulators. Surprisingly, it is proven that stratified Tellegen photonic crystals that break simultaneously the space inversion and time-reversal symmetries have always symmetric dispersion diagrams. Interestingly, we show that by combining chiral and nonreciprocal materials the photonic band diagrams can exhibit a spectral asymmetry such that omega(k) not equal omega(-k). Furthermore, it is demonstrated that in some conditions two juxtaposed Tellegen medium layers have an electromagnetic response analogous to that of a biased ferrite slab.info:eu-repo/semantics/publishedVersio
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