A study of the effect of section thickness and strength level on the transition temperature of structural steels

Three steels, in two heat treated conditions, were evaluated to determine the effect of section thickness and strength level on transistion temperature

ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures

Axion-like particles (ALPs) are leading candidates to explain the dark matter in the universe. Their production via the misalignment mechanism has been extensively studied for cosine potentials characteristic of pseudo-Nambu-Goldstone bosons. In this work we investigate ALPs with non-periodic potentials, which allow for large misalignment of the field from the minimum. As a result, the ALP can match the relic density of dark matter in a large part of the parameter space. Such potentials give rise to self-interactions which can trigger an exponential growth of fluctuations in the ALP field via parametric resonance, leading to the fragmentation of the field. We study these effects with both Floquet analysis and lattice simulations. Using the Press-Schechter formalism, we predict the halo mass function and halo spectrum arising from ALP dark matter. These halos can be dense enough to produce observable gravitational effects such as astrometric lensing, diffraction of gravitational wave signals from black hole mergers, photometric microlensing of highly magnified stars, perturbations of stars in the galactic disk or stellar streams. These effects would provide a probe of dark matter even if it does not couple to the Standard Model. They would not be observable for halos predicted for standard cold dark matter and for ALP dark matter in the standard misalignment mechanism. We determine the relevant regions of parameter space in the (ALP mass, decay constant)-plane and compare predictions in different axion fragmentation models.Comment: 50 pages and 22 figures in the main text, and 15 pages and 2 figures in appendices, v2: As published in JCA

Chemical composition of the scent from living flowers of Temnadenia odorifera (Vell.) J. F. Morales (Apocynaceae).

IFF. P5-S3. 8 a 12 de maio

Biologia floral de cinco espécies de Passiflora L. (Passifloraceae) em mata semidecídua

(Floral biology of five species of Passiflora L. (Passifloraceae)in a semideciduous forest). A comparative study of floral biology of five Passiflora species was carried out in the region of Campinas, São Paulo, southeastern Brazil. Passiflora alata, P. amethystina and P. miersii have purple to violet flowers and variegated filamentose corona. Their flowers open early in the morning and last about 12 hours, emit sweet odour, are allogamous and their main pollinators are large bees. Passiflora amethystina and P. miersii have similar floral morphology, differing from P. alata by a row of free filaments on the edge of the operculum. The operculum in P. alata is horizontally curved and denticulate at the margin. These differences in the operculum require a characterist behaviour from bees during their visits. Passiflora suberosa has green-yellowish flowers and a plicate operculum. Its flowers open at dawn and no odour is perceptible. The flowers are self-compatible and their main pollinators are wasps. Passiflora capsularis has white flowers and a plicate operculum. Its flowers are nocturnal, emit sweet odour, are self-compatible and possibly are pollinated by moths. The plicate operculum of these two latter species allows easy access to nectar by the visitors.(Biologia floral de cinco espécies de Passiflora L. (Passifloraceae) em mata semidecídua). O estudo da biologia floral de cinco espécies de Passiflora foi feito em uma mata de planalto em Campinas, São Paulo. Passiflora alata, P. amethystina e P. miersii apresentam flores de cor púrpura a violeta e corona variegada. As flores são diurnas, perfumadas, autoincompatíveis e polinizadas por abelhas de grande porte. Passiflora amethystina e P. miersii diferem de P. alata por apresentarem filamentos livres no opérculo, que em P. alata é horizontal e denticulado. Estas diferenças no opérculo promovem comportamentos característicos das abelhas durante as visitas. Passiflora suberosa possui flores verde-amareladas e opérculo plicado. As flores são diurnas, inodoras, autocompatíveis e polinizadas por vespas. Em P. capsularis as flores são brancas e o opérculo é plicado. As flores são noturnas, perfumadas, autocompatíveis e possivelmente polinizadas por mariposas. O opérculo plicado das duas últimas espécies permite que os visitantes tenham fácil acesso ao néctar.11912

Revisão Taxonômica de Chaetostoma Dc. (Melastomataceae, Microlicieae)

The genus Chaetostoma can be distinguished within the Microlicieae by the combination of the following diagnostic features: keeled, imbricate and pungent leaves lacking glandular punctation; a crown of appressed basally adnate hairs around the outward apex of the hypanthium; tetrasporangiate anthers; mature capsule longer than the hypanthium and reniform seeds with reticulate testa cells. Eleven species are recognized: Chaetostoma albiflorum, C. cupressinum, C. fastigiatum, C. flavum, C. glaziovii, C. inerme, C. armatum, C. riedelianum, C. selagineum, C. scoparium, C. stenocladon. All species of Chaetostoma are subshrubs or rarely shrubs. These species are restricted to a particular vegetational formation, “campo rupestre”, “campo de altitude” and “campo cerrado”, in the Brazilian states of Bahia, Goiás, Mato Grosso, Minas Gerais, São Paulo, Rio de Janeiro and Paraná (Brazil). Chaetostoma armatum has the broadest geographic distribution and the greatest morphological variation. O gênero Chaetostoma apresenta o seguinte conjunto de características diagnósticas: folhas carenadas a subcarenadas, imbricadas, pungentes; coroa de tricomas no ápice externo do hipanto; anteras tetrasporangiadas; ausência de pontuações glandulares; cápsula madura excedendo o comprimento do hipanto e semente reniforme com testa reticulada. Onze espécies são reconhecidas: Chaetostoma albiflorum, C. cupressinum, C. fastigiatum, C. flavum, C. glaziovii, C. inerme, C. armatum, C. riedelianum, C. selagineum, C. scoparium, C. stenocladon. As espécies de Chaetostoma são subarbustos ou raramente arbustos, endêmicas ou restritas a determinadas áreas de campo rupestre, campo de altitude ou campo cerrado nos estados da Bahia, Goiás, Mato Grosso, Minas Gerais, São Paulo, Rio de Janeiro e Paraná (Brasil). Chaetostoma armatum é a espécie que tem a maior distribuição geográfica e a maior variação morfológica

Fluorescence of Naphthol AS-MX is Readily Detectable in Dioxane Mixtures

Numerous enzymes have been demonstrated to be active in non-aqueous solutions, yet the utility of phosphatases under such conditions has been difficult to determine. Here, we demonstrate the ability to fluorescently detect naphthol AS‑MX in high percentages 1,4-dioxane with a fluorescence differential compared with naphthol AS‑MX phosphate. While intensities and maximum fluorescence wavelengths changed depending on solvent conditions, these results demonstrate this system’s potential for testing phosphatase activity in high amounts of dioxane

Melastomataceae da serra de São José, Minas Gerais

Apresenta-se uma lista das espécies da família Melastomataceae na Serra de São José, localizada em grande parte nos municípios de Tiradentes e Prados, no sudeste do estado de Minas Gerais, Brasil. As coletas foram realizadas principalmente em Campo rupestre e Cerrado. A listagem dos gêneros e espécies ocorrentes na Serra de São José foi comparada com as listagens de Melastomataceae de algumas floras rupestres publicadas para Minas Gerais, Bahia e Escudo das Guianas. Foram encontrados 17 gêneros e 57 espécies de Melastomataceae, uma riqueza considerável para uma área de apenas 30 km². Foram registrados os gêneros Miconia (15 espécies), Tibouchina (9), Leandra (8), Microlicia (7), Trembleya (3), Cambessedesia (2), Chaetostoma (2), Rhynchanthera (2), Acisanthera, Clidemia, Comolia, Lavoisiera, Macairea, Marcetia, Ossaea, Siphanthera e Svitramia (uma espécie de cada). Leandra australis (Cham.) Cogn., espécie do sul do Brasil,é reportada pela primeira vez para o estado de Minas Gerais; também foi registrada uma nova espécie de Cambessedesia

Environmental sustainability in basic research:a perspective from HECAP+

The climate crisis and the degradation of the world's ecosystems require humanity to take immediate action. The international scientific community has a responsibility to limit the negative environmental impacts of basic research. The HECAP+ communities (High Energy Physics, Cosmology, Astroparticle Physics, and Hadron and Nuclear Physics) make use of common and similar experimental infrastructure, such as accelerators and observatories, and rely similarly on the processing of big data. Our communities therefore face similar challenges to improving the sustainability of our research. This document aims to reflect on the environmental impacts of our work practices and research infrastructure, to highlight best practice, to make recommendations for positive changes, and to identify the opportunities and challenges that such changes present for wider aspects of social responsibility

Environmental sustainability in basic research: a perspective from HECAP+

The climate crisis and the degradation of the world's ecosystems require humanity to take immediate action. The international scientific community has a responsibility to limit the negative environmental impacts of basic research. The HECAP+ communities (High Energy Physics, Cosmology, Astroparticle Physics, and Hadron and Nuclear Physics) make use of common and similar experimental infrastructure, such as accelerators and observatories, and rely similarly on the processing of big data. Our communities therefore face similar challenges to improving the sustainability of our research. This document aims to reflect on the environmental impacts of our work practices and research infrastructure, to highlight best practice, to make recommendations for positive changes, and to identify the opportunities and challenges that such changes present for wider aspects of social responsibility.Comment: 158 pages, 21 figures; comments welcome. Revisions included in Version 2.0 are detailed on page 3 of the pdf. If you would like to endorse this document please visit: https://sustainable-hecap-plus.github.io/. An HTML version of this document is available at: https://sustainable-hecap-plus.github.io