1,151 research outputs found
Some Issues on Ontology Integration
The word integration has been used with different
meanings in the ontology field. This article
aims at clarifying the meaning of the word âintegrationâ
and presenting some of the relevant work
done in integration. We identify three meanings of
ontology âintegrationâ: when building a new ontology
reusing (by assembling, extending, specializing
or adapting) other ontologies already available;
when building an ontology by merging several
ontologies into a single one that unifies all of
them; when building an application using one or
more ontologies. We discuss the different meanings
of âintegrationâ, identify the main characteristics
of the three different processes and proposethree words to distinguish among those meanings:integration, merge and use
OcorrĂȘncia de novos espĂ©cimens de Taeniopteris na Bacia CarbonĂfera do Douro (Estefaniano C inferior) [Gzheliano inferior],NW de Portugal
Contribution and stratigraphic implications discussion of new specimens of Taeniopteris (Taeniopterisjejunata, Taeniopteris bertrandiana and Taeniopteris sp. nov. (two species ?) found in the SĂŁo Pedro da Covaregion (Gondomar), Douro Carboniferous Basin (lower Stephanian C) [lower Gzhelian
Coastal bathymetry estimation using an ensemble of synthetic aperture radar images from Sentinel-1
In this study, coastal bathymetry is estimated with a wave ray-tracing algorithm using wave parameters retrieved from Synthetic Aperture Radar (SAR) images acquired by the Sentinel-1 satellites. The method relies on the long swell waveâs detection by SAR imagery and the waveâs properties adjustment to the underwater topography, which can be mathematically related using the linear dispersion relation. The ray-tracing algorithm tracks the shoaling waves until the wave breaking zone, using the wavelength and wave direction retrieved from the 2D directional spectra applied at consecutive sub-images. Then, by inverting the linear wave dispersion relationship, the depth is calculated based on the mean wavelength obtained for each sub-image and maintaining the wave period retrieved at the first offshore position, which is computed using a mean depth from an independent bathymetric source. The output of the algorithm is a bathymetric model that results from the interpolation of the depth computed at each tracking position to a uniform grid and the results are compared with bathymetric information from the General Bathymetric Chart of the Ocean. The use of a monthly ensemble of SAR images, instead of individual ones, to reproduce the bathymetry near Aveiro, Portugal, resulted in a smoother topography with lower relative errors, suggesting that the final bathymetric model retrieved from SAR should result from a combination of SAR images. The methodology presented here to infer the bathymetry using space-borne SAR imagery can be useful to retrieve the mean bottom topography (especially in remote areas where the traditional hydrographic surveying methods are not performed regularly) and to reproduce new underwater structures, such as banks, reefs or bars, which are important to detect for the safety of navigation.Peer Reviewe
Development of Thabdi milk sweets of Gujarat State, India utilizing Ghee residue as an ingredient
Thabdi an ethnic khoa based milk sweet of Gujarat State, which is famous for its characteristic colour texture and flavour, was prepared using ghee residue as an ingredient in order to provide a way to effectively utilize the by-product. Ghee residue was added in milk at different rates viz. T1 (control), T2 (2%), T3 (4%), T4 (6%), T5 (8%) and T6 (10 %). Addition of ghee residue in milk for making Thabdi was found to significantly (P?0.05) increase the fat, protein and ash content, Free fatty acids (FFA), Thiobarbituric acid (TBA) value and acidity significantly (P?0.05) decreased the hardness of the products. Addition of ghee residue resulted in elimination of the 40 min holding period generally used for making Thabdi. Sample T4 (containing 6 % ghee residue) yielded the most acceptable product in terms of sensory attributes of product. It had a glossy brown colour, soft body, uniform grainy texture and pleasing rich nutty caramel flavour. During storage of sample T4 at cabinet temperature (20±1oC) and room temperature (37 C), the acidity, FFA, HMF (Hydroxymethyl Furfural), TBA and hardness increased significantly (P? 0.05) and sensory scores, moisture, water activity and pH decreased significantly(P? 0.05). It can be concluded that the most acceptable quality Thabdi could be prepared by addition of ghee residue at the rate of 6 % w/w of milk with improved shelf-life of 28 days at 20±1oC and 14 days at 37±1oC as compared to 21 and 12 days for control respectively. Thus, Thabdi sweet prepared with the use of ghee residue as an ingredient will provide a way to effectively utilize the by-product
Infection By The Human Papillomavirus In Teenagers Sexually Active: Clinic And Subclinic Manifestations.
This research studies the association of the cervical condyloma with the intraepithelial neoplasia, during sex activity, pregnancy, diagnose methods, cytology and colposcopy in teenagers. The objective of this research is to study the propaedeutics for the uterine coli condyloma diagnose in a group of teenagers. For this purpose, we have studied 131 teenagers sexually active with ages between 14 and 19 years and presenting histologically confirmed uterine coli condyloma. Association with intraepithelial neoplasia, sexual activity duration, method of diagnose, pregnancy analysis, cytology and colposcopy results and association with vulva and vagina injuries were evaluated. The high association rate with condyloma and intraepithelial neoplasia after a short time of sexual activity and the none presence of macroscopic warts in the genital organs in 80% of cases presenting cervical condyloma, demonstrate that: a more careful investigation with colposcopy and biopsy of the inferior genitals of the women-teenagers sexually active is needed, when presenting modified cervical cytology.113494895
Development of triamcionolone based lipid nanocapsules as platforms for ocular drug delivery
Purpose
Triamcinolone acetonide (TAA) is considered a first-line drug by itself or as a combined treatment of several intraocular diseases such as macular edema, retinal vein thrombosis, uveitis and age-related macular degeneration. The development of TAA dosage forms is limited due to its poor solubility in water and physiologically acceptable solvents. Lipid nanocapsules (LNCs) are biocompatible systems that allow loading both hydrophobic and hydrophilic drugs. LNCs present a versatile composition and application suitable for different routes of administration. The aim of this work was to develop and characterize a novel lipid LNCs formulation containing TAA as drug delivery system.
Methods
LNCs were prepared in triplicate using an optimized phase inversion-based method described by Heurtault et al., 2002. Due to the poor solubility of TAA in the oily phase of the original formulation, two co-surfactants (captexÂź 500p -Glyceryl triacetate and oleic acid) in three proportions (20, 30 and 50%) were tested. The average particle size (APS), polydispersity index (PI), zeta potential (ZP) and entrapment efficacy (EE) were measured.
Results
Acceptable results were obtained with a 20% of both co-surfactants. LNCs with captexŸ 500p leads to about (40±1) nm size nanoparticles with a narrow size distribution (PI less than 0.2), a negative ZP (-1.2±0.7) mV and EE (85.8±0.8) % while LNCs with oleic acid showed an APS of (35.9± 0.6) nm and a PI below 0.1 with a negative ZP (-3.6±0.6) mV and EE (87±2) %. Moreover, both systems were stable for two months.
Conclusions
LNCs allow encapsulation of TAA and their properties remain constant over long periods of time. Thus, LNCs are promising systems than may be a potential strategy to improve efficacy and decrease side effects of this drug so used in the treatment of intraocular diseases
Impacts of climate changes on risk zoning for cowpea in the Amazonian tropical conditions
The climate risk zoning was carried out for cowpea cultivated in northeastern Amazonia, ParĂĄ state, Brazil. SystĂšme dâAnalyse
RĂ©gionale des Risques Agroclimatologiques (SARRA) crop model was used and calibrated from data obtained in field experiments
conducted between 2013 and 2016 in Castanhal, state of ParĂĄ. Low climate risk areas were defined as those with water requirement
satisfaction index (WRSI) greater than or equal to 0.5 during flowering and early grain development and less than 20 mm of total rainfall
during grain maturation and harvest for at least 80% of the simulated sowings of the crop. Simulations of the current and future climate
conditions were carried out with the regional climate modelling system version 4 (RegCM4) nested with the HadGEM2 global circulation
model with RCP 4.5 IPCC-AR4 scenario. The results show that climate changes are likely to reduce the duration of the optimal period for
sowing cowpea in the mentioned regioninfo:eu-repo/semantics/publishedVersio
Experimental feasibility of measuring the gravitational redshift of light using dispersion in optical fibers
This paper describes a new class of experiments that use dispersion in
optical fibers to convert the gravitational frequency shift of light into a
measurable phase shift or time delay. Two conceptual models are explored. In
the first model, long counter-propagating pulses are used in a vertical fiber
optic Sagnac interferometer. The second model uses optical solitons in
vertically separated fiber optic storage rings. We discuss the feasibility of
using such an instrument to make a high precision measurement of the
gravitational frequency shift of light.Comment: 11 pages, 12 figure
Primeira ocorrĂȘncia da ordem Caloneurodea no CarbonĂfero de Portugal: Lusitaneura covensis nov. gen., nov. sp.
Lusitaneura covensis gen. nov., sp. nov. The authors present the description of the first
Portuguese representative of the Palaeozoic insect order Caloneurodea from the Carboniferous of the
Douro Basin (NW of Portugal
Insights into corrosion behaviour of uncoated Mg alloys for biomedical applications in different aqueous media
MgCa and MgGd series of alloys are often reported as promising candidates for biomedical
applications. In the present study, cytotoxicity and corrosion behavior of Mg1Ca and
Mg10Gd alloys in different electrolytes (NaCl, PBS, MEM) have been investigated in order to
make a direct comparison and understand the mechanisms behind their performance.
Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were
employed to analyze corrosion processes depending on media composition, whereas X-Ray
diffraction (XRD) and scanning electron microscopy (SEM) were used to evaluate crystalline
structure, phase composition and surface morphology of the corroded substrates after
immersion in the different electrolytes. Moreover, cytotoxicity of the Mg alloys was
assessed using the WST-1 reduction and lactate dehydrogenase (LDH) release assays in
L929 mouse fibroblasts. The electrochemical results showed that Mg1Ca has a lower
degradation rate when compared to Mg10Gd, due to the lower microgalvanic effects and
the presence of Ca as an alloying element. Furthermore, the corrosion activity is reduced in
MEM, for both alloys, when compared to NaCl and PBS. The cytotoxicity assays revealed
that Mg10Gd was cytotoxic in all the conditions tested, while the toxicity of Mg1Ca was
low. Overall, these findings show that Mg1Ca alloy presents a higher corrosion resistance
and biocompatibility and is a promising material to be used in biomedical implants.This work was financed by Portugal 2020 through European
Regional Development Fund (ERDF) in the frame of Operational
Competitiveness and Internationalization Programme (POCI),
in the scope of the project MAGICOAT POCI-01-0145-FEDER016597/PTDC/CTM-BIO/2170/2014 and in the scope of the project CICECO - Aveiro Institute of Materials, UIDB/50011/2020 &
UIDP/50011/2020, financed by national funds through
the Portuguese Foundation for Science and Technology/
MCTES. Furthermore, thanks are due to Portuguese Foundation
for Science and Technology/MCTES for the financial support
through national funds to EPI Unit (UIDB/04750/2020).info:eu-repo/semantics/publishedVersio
- âŠ