12,517 research outputs found
Modelling chirp as a function of reflectivity in electroabsorption modulated lasers (EML)
No full textWe present a theoretical analysis of the chirp caused by the reflection of light from the Electro-Absorption Modulator (EAM) facet back into the laser. The work is modelled on our Essex Distributed Time Domain Model (eDTDM) (S. P. Higgins and A. J. Vickers, Proc SPIE Phys. and Simulations of Opto-Electron. Devices X11, 5349, 435 (2004) [1]; A. J. Vickers and S. P. Higgins, A new model for complex dynamic laser modelling, IEEE J Quantum Electron., 2005, awaiting publication [2]). A novel method of determining the chirp within the simulation is presented. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA
A new species of Aleurolobus Quaintance et Baker (Homoptera, Aleyrodidae) from Southern Europe.
No full textAleurolobus teucrii n. sp. is described from southern Italy and the Maltese Islands (Central Mediterranean). The species seems to be monophagous on Teucrium fruticans L. A key to the European species of this genus (A. niloticus Priesner et Hosny, A. olivinus (Silvestri), A. wunni (Ryberg) and A. teucrii n. sp.) is provided.peer-reviewe
Mosquito Larvicidal Constituents from Lantana Viburnoides SP Viburnoides Var Kisi (A. rich) Verdc (Verbenaceae).
No full text\ud
\ud
Lantana viburnoides sp viburnoides var kisi is used in Tanzania ethnobotanically to repel mosquitoes as well as in traditional medicine for stomach ache relief. Bioassay-guided fractionation and subtraction bioassays of the dichloromethane extract of the root barks were carried out in order to identify the bioactive components for controlling Anopheles gambiae s.s. mosquito larvae. Twenty late III or early IV instar larvae of An. gambiae s.s. were exposed to various concentrations of the plant extracts, fractions, blends and pure compounds, and were assayed in the laboratory by using the protocol of WHO 1996. Mean mortalities were compared using Dunnett's test (p < 0.05) and lethal concentration calculated by Lackfit Inversel of the SAS programme. The crude extract (LC50 = 7.70 ppm in 72 h) and fractions exhibited different level of mosquito larvicidal activity with subtraction of some fractions resulting in activity enhancement. The active fractions contained furanonaphthaquinones regio-isomers (LC50 = 5.48-5.70 ppm in 72 h) and the lantadene triterpenoid camaric acid (LC50 = 6.19 ppm in 72 h) as active principles while the lupane triterpenoid betulinic acid (LC50 < 10 ppm in 72 h) was obtained from the least active fraction. Crude extracts and some fractions had higher or comparable larvicidal activity to the pure compounds. These results demonstrate that L. viburnoides sp viburnoides var kisi extracts may serve as larvicides for managing various mosquito habitats even in their semi-purified form. The isolated compounds can be used as distinct markers in the active extracts or plant materials belonging to the genus Lantana
The effect of dentin desensitizers on shear bond strengths and vickers surface hardness of self-adhesive resin cement
No full textAim: The aim of study is to evaluate the effects of desensitizing agents on the shear bond strengths (SBS) and Vickers surface hardness (HV) of self-adhesive resin cement. Materials and Methods: One-hundred twenty human molars were sectioned parallel to the occlusal plane, polished and randomly divided into 6 groups: Control (CO); Teethmate (TM); Bifluorid (BF); Gluma (GL); Smartprotect (SP); Bisblock (BB). Self-adhesive cement was applied into cylinder mold (3mm×3mm) (N=10). SBS was measured using a Universal testing machine at a 0.5mm/min. Statistical analysis was performed using one-way ANOVA and Tukey’s test (?=0.05). The tooth surface was examined by scanning electron microscopy (SEM). To evaluate HV, self-adhesive cement was applied into cylinder mold (3mm×100µm) (n=10). HV values at the dentin side of cement were evaluated at four times. A load of 200 g was applied for 15 s, and vertical and horizontal indentation diagonals were measured under microscope. All measurements were converted to the Vickers surface hardness (HV) value by using Vickers hardness formula. Data were analyzed by one-way ANOVA and Tukey’s tests (?=0.05). Results: SP group showed the greatest MPa (4.05±1.34 MPa) followed by BB (2.71±1.39 MPa), CO (2.12±0.76 MPa), GL (1.96±1.23 MPa), TM (1.80±0.66 MPa) and BF (1.30±0.57 MPa). BF group showed the lowest HV (11.34±2.24 HV) followed by SP (14.27±3.65 HV), GL (15.58±1.77 HV), BB (16.06±5.73 HV), CO (18.04±3.05 HV), and TM (19.22±2.10 HV). BF desensitizer showed lowest the MPa and HV value. BF desensitizer shows the lowest SBS desensitizer, but this effect is not statically important (p>.05). Conclusions: SP and BB desensitizers have a positive effect on the SBS of self-adhesive cement. For Vickers surface hardness, BF and SP desensitizers showed statically decrease in surface hardness of resin cement (p,05). Sonuçlar: SP ve BB hassasiyet gidericiler self-adesiv resin simanların makaslama bağlanma dayanıklılığına olumlu etkisi bulunmuştur. Yüzey sertliği açısından değerlendirildiğinde BF ve SP hassasiyet gidericiler resin simanın yüzey sertliğinde istatistiksel olarak azalmaya neden olduğu görülmüştür (p<,05)
Implantação de indicadores de performance em uma indústria metalúgica: uma contribuição à gestão de resultados
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.A Pesquisa aborda a questão da geração, comunicação e utilização interna de indicadores de performance nas indústrias. Pesquisa a eficácia dos indicadores hoje disponíveis aos gerentes, como ferramentas capazes de responder às perguntas feitas no dia a dia da operação e nas necessidades de decisões. Verifica se há possibilidade de se criar de forma sistemática e adequada esse indicadores, após a escolha de um método para solução de problemas complexos, a SSM (Soft Sistem Metodology). Utiliza como fio condutor para as análises, fundamentações teóricas sobre modernas técnicas necessárias aos sistemas de informações gerenciais, modelagens sobre métodos racionais para solução de problemas complexos e pesquisa de campo sobre o estado da arte no uso de indicadores, aplicada aos alunos das últimas séries dos cursos de Administração de Empresas, Economia e Ciências Contábeis nos câmpi de Joinville e São Bento do Sul, da Universidade da Região de Joinville - UNIVILLE, pressupondo-os conhecedores dos sistemas informacionais nas empresas em que atuam, e focalizadamente, entrevistas realizadas com aplicação de questionário, aos gerentes de uma metalúrgica em Joinville. Os resultados obtidos mostraram como os usuários percebem os indicadores colocados à sua disposição e as carências que atribuiram aos sistemas de informação. Com base na análise das necessidades e dos possíveis modelos, disponíveis para suprirem as necessidades, pôde-se demostrar através de um processo racional, que envolveu gerentes de diversas áreas de uma metalúrgica, a geração e os benefícios em elaborar um indicador de performance eficaz, utilizando o método de aprendizagem/descoberta/ação denominado SSM (Soft Sistem Metodology)
Thermotoga lettingae sp. nov., a novel thermophilic, methanol-degrading bacterium isolated from a thermophilic anaerobic reactor
No full textA novel, anaerobic, non-spore-forming, mobile, Gram-negative, thermophilic bacterium, strain TMO(T), was isolated from a thermophilic sulfate-reducing bioreactor operated at 65 degrees C with methanol as the sole substrate. The G C content of the DNA of strain TMO(T) was 39.2 molÐThe optimum pH, NaCl concentration, and temperature for growth were 7.0, 1.0°and 65 degrees C, respectively. Strain TMO(T) was able to degrade methanol to CO(2) and H(2) in syntrophic culture with Methanothermobacter thermautotrophicus DeltaH or Thermodesulfovibrio yellowstonii. Thiosulfate, elemental sulfur, Fe(III) and anthraquinone-2,6-disulfonate were able to serve as electron acceptors during methanol degradation. In the presence of thiosulfate or elemental sulfur, methanol was converted to CO(2) and partly to alanine. In pure culture, strain TMO(T) was also able to ferment methanol to acetate, CO(2) and H(2). However, this degradation occurred slower than in syntrophic cultures or in the presence of electron acceptors. Yeast extract was required for growth. Besides growing on methanol, strain TMO(T) grew by fermentation on a variety of carbohydrates including monomeric and oligomeric sugars, starch and xylan. Acetate, alanine, CO(2), H(2), and traces of ethanol, lactate and alpha-aminobutyrate were produced during glucose fermentation. Comparison of 16S rDNA genes revealed that strain TMO(T) is related to Thermotoga subterranea (98€and Thermotoga elfii (98Ž The type strain is TMO(T) (=DSM 14385(T)=ATCC BAA-301(T)). On the basis of the fact that these organisms differ physiologically from strain TMO(T), it is proposed that strain TMO(T) be classified as a new species, within the genus Thermotoga, as Thermotoga lettingae
Data Science Education: The Signal Processing Perspective [SP Education]
No full textIn the last decade, the signal processing (SP) community has witnessed a paradigm shift from model-based to data-driven methods. Machine learning (ML) - more specifically, deep learning - methodologies are nowadays widely used in all SP fields, e.g., audio, speech, image, video, multimedia, and multimodal/multisensor processing, to name a few. Many data-driven methods also incorporate domain knowledge to improve problem modeling, especially when computational burden, training data scarceness, and memory size are important constraints.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Signal Processing System
Screening of biodiesel production from waste tuna oil (Thunnus sp.), seaweed Kappaphycus alvarezii and Gracilaria sp.
No full textBiodiesel has several advantages over solar. Compared to solar, biodiesel has more eco-friendly characteristic
and produces lower greenhouse gas emissions. Biodiesel that is made from animal fats can be produced from fish oil,
while other alternative sources from vegetable oils are seaweed Kappaphycus alvarezii and Gracilaria sp. Waste tuna oil
(Thunnus sp.) in Indonesia is commonly a side product of tuna canning industries known as tuna precook oil; on the other
hand, seaweed Gracilaria sp. and Kappaphycus alvarezii are commonly found in Indonesia’s seas. Seaweed waste that
was used in the present study was 100 kg and in wet condition, and the waste oil was 10 liter. The seaweed was extracted
with soxhletation method that used n-hexane as the solvent. To produce biodiesel, trans esterification was performed on
the seaweed oil that was obtained from the soxhletation process and waste tuna oil. Biodiesel manufactured from
seaweed K. alvarezii obtained the best score in flash point, freezing point, and viscosity test. However, according to level
of manufacturing efficiency, biodiesel from waste tuna oil is more efficient and relatively easier compared to biodiesel
from waste K. alvarezii and Gracilaria sp
Patagorhynchus Chimento & Agnolín & Manabe & Tsuihiji & Rich & Vickers-Rich & Novas 2023, gen. nov.
No full textPatagorhynchus gen. nov. (monotypic genus) Etymology. Patago, from Patagonia, and rhynchus, nose. Diagnosis. Patagorhynchus differs from basal monotremaformes (including Steropodon) in having a dilambdodont crown morphology and a labial cingulid;12 dilambdodont disposition of cusps and crests on molar crown is shared with Teinolophos and ornithorhynchids; Patagorhynchus and ornithorhynchids differ from the basal monotremaformes Teinolophos in having notably low and mesiodistally expanded teeth with the anterior lobe (equivalent to trigonid) positioned lower than the posterior one (equivalent to talonid), in having talonid composed of two (rather than one) transverse lophids, and lacking a labial cingulid. The anterior cingulid of Patagorhynchus is wider than that in Teinolophos but narrower than that in Obdurodon. Patagorhynchus shares with the toothed monotremes Obdurodon and Monotrematum both lingual and buccal extremes of the V-shaped lobe (equivalent to trigonid) with one buccal and two lingual cusps, with the first being more elevated than the latter two, and a complete mid-valley. Patagorhynchus bears two roots on m2 (as also probably in Monotrematum) and differs from Obdurodon and Ornithorhynchus, in which more than 5 roots are present. The lobes of Patagorhynchus and Obdurodon show hypsodonty, in contrast with the much more brachyodont molariforms of Monotrematum. Patagorhynchus exhibits the following features that are lacking in other monotremes, and may be considered autapomorphic among monotremes: mid-valley labially diverges (i.e., the length of the labial edge of this valley represents two times its lingual length) and anterior cingulid labially narrow and does not reach the labial margin of the protoconid. Type and the only species. Patagorhynchus pascuali sp. nov. (Figs. 1, 2a and Supplementary Fig. 3).Published as part of Chimento, Nicolás R., Agnolín, Federico L., Manabe, Makoto, Tsuihiji, Takanobu, Rich, Thomas H., Vickers-Rich, Patricia & Novas, Fernando E., 2023, First monotreme from the Late Cretaceous of South America, pp. 1-6 in Communications Biology (146) (146) 6 on page 2, DOI: 10.1038/s42003-023-04498-7, http://zenodo.org/record/766499
Fig. 6. (a) Streptomyces sp. strain AF1 (left, Author collection) and (b) Streptomyces rochei strain AB1 (right, compared to [24])
No full textStreptomyces sp. strain AF1 (left, Author collection) and (b) Streptomyces rochei strain AB1 (right, compared to [24]
- …
