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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 1 - 200 of 265 Journals sorted by number of followers
Science     Full-text available via subscription   (Followers: 4908)
Scientific American     Full-text available via subscription   (Followers: 493)
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 241)
Journal of the History of Ideas     Full-text available via subscription   (Followers: 163)
Scientific Reports     Open Access   (Followers: 82)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 49)
Science Advances     Free   (Followers: 42)
American Journal of Applied Sciences     Open Access   (Followers: 22)
Journal of Scientometric Research     Open Access   (Followers: 22)
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 19)
Studies in Science Education     Hybrid Journal   (Followers: 18)
Scienze Regionali : Italian Journal of Regional Science     Full-text available via subscription   (Followers: 18)
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
Bioethics Research Notes     Full-text available via subscription   (Followers: 15)
Ghana Studies     Full-text available via subscription   (Followers: 15)
Advanced Science     Open Access   (Followers: 15)
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 14)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 14)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 11)
Configurations     Full-text available via subscription   (Followers: 11)
Kennedy Institute of Ethics Journal     Full-text available via subscription   (Followers: 10)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 10)
Scientific American Mind     Full-text available via subscription   (Followers: 10)
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 9)
Data Curation Profiles Directory     Open Access   (Followers: 9)
Issues in Science & Technology     Free   (Followers: 8)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
Enhancing Learning in the Social Sciences     Open Access   (Followers: 7)
European Scientific Journal     Open Access   (Followers: 7)
Royal Society Open Science     Open Access   (Followers: 7)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 6)
Malawi Journal of Science and Technology     Open Access   (Followers: 6)
Scientific Data     Open Access   (Followers: 6)
Current Research in Geoscience     Open Access   (Followers: 5)
Journal of Analytical Science & Technology     Open Access   (Followers: 5)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
SINET : Ethiopian Journal of Science     Open Access   (Followers: 5)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 5)
Globe, The     Full-text available via subscription   (Followers: 4)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
International Journal of Innovation and Applied Studies     Open Access   (Followers: 4)
Network Science     Hybrid Journal   (Followers: 4)
Journal of Diversity Management     Open Access   (Followers: 4)
Tanzania Journal of Science     Open Access   (Followers: 4)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
The Social Studies     Hybrid Journal   (Followers: 3)
Theoria     Open Access   (Followers: 3)
National Academy Science Letters     Hybrid Journal   (Followers: 3)
Східно-Європейський журнал передових технологій : Eastern-European Journal of Enterprise Technologies     Open Access   (Followers: 3)
South East European University Review (SEEU Review)     Open Access   (Followers: 3)
Nordic Studies in Science Education     Open Access   (Followers: 3)
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
Science & Diplomacy     Free   (Followers: 3)
International Journal of Network Science     Hybrid Journal   (Followers: 3)
South African Journal of Science     Open Access   (Followers: 2)
Journal of Advanced Research     Open Access   (Followers: 2)
Asian Journal of Scientific Research     Open Access   (Followers: 2)
Proceedings of the Linnean Society of New South Wales     Full-text available via subscription   (Followers: 2)
Journal of Natural Sciences Research     Open Access   (Followers: 2)
Nuncius     Hybrid Journal   (Followers: 2)
Digithum     Open Access   (Followers: 2)
Science and Technology     Open Access   (Followers: 2)
Journal of Science and Technology     Open Access   (Followers: 2)
TECNOSCIENZA: Italian Journal of Science & Technology Studies     Open Access   (Followers: 2)
Springer Science Reviews     Hybrid Journal   (Followers: 2)
Journal of Social Science Research     Open Access   (Followers: 2)
Rehabilitation Research, Policy, and Education     Hybrid Journal   (Followers: 2)
New Directions in the Teaching of Physical Sciences     Open Access   (Followers: 2)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
Nordic Journal of Science and Technology     Open Access   (Followers: 2)
Australian Field Ornithology     Full-text available via subscription   (Followers: 1)
Politique et Sociétés     Full-text available via subscription   (Followers: 1)
COSMOS     Hybrid Journal   (Followers: 1)
Journal of Science and Technology Policy Management     Hybrid Journal   (Followers: 1)
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
Ingenieria y Ciencia     Open Access   (Followers: 1)
Investigacion y Ciencia     Open Access   (Followers: 1)
International Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 1)
Frontiers in Science     Open Access   (Followers: 1)
Modern Applied Science     Open Access   (Followers: 1)
OmniScience : A Multi-disciplinary Journal     Full-text available via subscription   (Followers: 1)
Scientific Journal of Pure and Applied Sciences     Open Access   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Technologies     Open Access   (Followers: 1)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
National Science Review     Hybrid Journal   (Followers: 1)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Science, Technology and Arts Research Journal     Open Access   (Followers: 1)
Journal of Scientific Research     Open Access   (Followers: 1)
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Epiphany     Open Access   (Followers: 1)
Fontanus     Open Access   (Followers: 1)
Образование и наука     Open Access   (Followers: 1)
THEORIA : An International Journal for Theory, History and Foundations of Science     Full-text available via subscription   (Followers: 1)
Heliyon     Open Access   (Followers: 1)
Revista Theoria     Open Access   (Followers: 1)
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 1)
Revista MundoFesc     Open Access  
Butlletí de la Institució Catalana d'Història Natural     Open Access  
Innovare : Revista de ciencia y tecnología     Open Access  
Revista Científica de la FAREM     Open Access  
Mutis     Open Access  
Ruhuna Journal of Science     Open Access  
Jurnal Teknosains     Open Access  
Revista Logos Ciencia & Tecnología     Open Access  
World Scientific Research     Open Access  
International Letters of Social and Humanistic Sciences     Open Access  
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Research Ideas and Outcomes     Open Access  
Apuntes de Ciencia & Sociedad     Open Access  
Jurnal Udayana Mengabdi     Open Access  
Conference Papers in Science     Open Access  
Jurnal MIPA     Open Access  
Unnes Science Education Journal     Open Access  
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access  
Selforganizology     Open Access  
Portal de la Ciencia     Open Access  
Mètode Science Studies Journal : Annual Review     Open Access  
Karbala International Journal of Modern Science     Open Access  
Revista Catarinense da Ciência Contábil     Open Access  
Reviews in Theoretical Science     Full-text available via subscription  
Temas y Debates     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Universitas (León)     Open Access  
Seminário de Iniciação Científica e Seminário Integrado de Ensino, Pesquisa e Extensão     Open Access  
ScienceRise     Open Access  
Zeitschrift für Didaktik der Naturwissenschaften     Hybrid Journal  
Simbiótica     Open Access  
Open Journal of Applied Sciences     Open Access  
Revista UNIMAR     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
Revista UniVap     Open Access  
Ithaca : Viaggio nella Scienza     Open Access  
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi     Open Access  
Communications in Applied Sciences     Open Access  
Ciencia Amazónica (Iquitos)     Open Access  
Smart Science     Open Access  
Science World Journal     Open Access  
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
International Journal of Engineering, Science and Technology     Open Access  
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Población y Desarrollo - Argonautas y caminantes     Open Access  
Journal of the South Carolina Academy of Science     Open Access  
MethodsX     Open Access  
Journal of Unsolved Questions     Open Access  
Journal of Science of the University of Kelaniya Sri Lanka     Open Access  
Metode & Forskningsdesign     Open Access  
International Archives of Science and Technology     Open Access  
Sciences du jeu     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Cuadernos de Investigación UNED     Open Access  
Interciencia     Open Access  
Ciencia Ergo Sum     Open Access  
Scientific World     Open Access  
Comunicata Scientiae     Open Access  
Uniciencia     Open Access  
SAINSTIS     Open Access  
Diálogos Interdisciplinares     Open Access  
Nepal Journal of Science and Technology     Open Access  
Revista Crítica de Ciências Sociais     Open Access  
Journal of Taibah University for Science     Open Access  
Journal of Integrated Science and Technology     Open Access  
Dhaka University Journal of Science     Open Access  
Karaelmas Science and Engineering Journal     Open Access  
Journal of the National Science Foundation of Sri Lanka     Open Access  
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Journal of the Asiatic Society of Bangladesh, Science     Open Access  
QScience Connect     Open Access  
Einstein (São Paulo)     Open Access  
Revista de la Universidad del Zulia     Open Access  
InterSciencePlace     Open Access  
Trilogía     Open Access  
Bangladesh Journal of Scientific Research     Open Access  
BIBECHANA     Open Access  
The Scientific World Journal     Open Access  
Walailak Journal of Science and Technology     Open Access  
Revista Sociedad y Economía     Open Access  
Revista Cientifica Guillermo de Ockham     Open Access  
Entramado     Open Access  
Universitas Scientiarum     Open Access  
Interface Focus     Full-text available via subscription  
Proceedings of the Royal Society of Queensland, The     Full-text available via subscription  
Chain Reaction     Full-text available via subscription  
UNED Research Journal / Cuadernos de Investigación UNED     Open Access  
Journal of King Saud University - Science     Open Access  
Anales del Instituto de la Patagonia     Open Access  
Transactions of Tianjin University     Full-text available via subscription  
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Tydskrif vir Geesteswetenskappe     Open Access  
TD : The Journal for Transdisciplinary Research in Southern Africa     Open Access  

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Bulletin de la Société Royale des Sciences de Liège
Journal Prestige (SJR): 0.109
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0037-9565 - ISSN (Online) 1783-5720
Published by Université de Liège Homepage  [9 journals]
  • Changements sédimentologiques dans les hautes terrasses de la Meuse à
           l’amont immédiat de Liège (Belgique)

    • Abstract: À l’amont immédiat de Liège, l’étude sédimentologique d’une succession de hautes terrasses de la Meuse a conduit à confirmer des étapes de l’évolution du bassin. Les plus hautes terrasses ont été développées par la Meuse qui prenait sa source sur le flanc nord du Massif de Rocroi (Meuse de Dinant). Le cailloutis de plateau (Fontaine à 200 m) plus fin que tous les suivants est rapporté au rivage de la mer chattienne en régression. Au cours de l’incision jusqu’à 170 m, la rivière a surtout remanié le cailloutis sublittoral précité en y ajoutant des éléments un peu plus grossiers. Le cailloutis de la terrasse suivante (Chokier-Haut à 165 m) est fondamentalement différent ; il comporte une composante nouvelle originaire des massifs de roches métamorphiques de Haute Belgique qui devrait répondre à la capture de la Semois. Immediately upstream of Liège, the sedimentological study of a succession of high terraces of the Meuse has led to confirm stages in the evolution of the basin. The highest terraces were developed by the Meuse which had its source on the northern flank of the Massif de Rocroi. The plateau gravel (Fontaine at 200 m) finer than all the following is linked to the shore of the Chattian sea in regression. During the incision to 170 m, the river mainly reworked the aforementioned sublittoral gravel by adding slightly coarser elements. The gravel on the next terrace (Chokier-Haut at 165 m) is fundamentally different; it includes a new component originating from the metamorphic rock massifs of High Belgium which should respond to the capture of the Semois.
      PubDate: Mon, 20 Nov 2023 00:00:00 +010
  • La caféine, une ressource naturelle renouvelable pour la synthèse de
           catalyseurs biosourcés

    • Abstract: Les catalyseurs interviennent dans de nombreux aspects de notre vie quotidienne mais leur véritable nature reste méconnue de la majorité du grand public. Cet article vise à expliquer ce que sont réellement les catalyseurs et à présenter certaines de leurs applications pratiques. Traditionnellement, les catalyseurs sont principalement issus de l'industrie pétrolière. Cet article met en lumière les principes de la chimie verte qui prônent l'utilisation de ressources respectueuses de l'environnement et leur application au domaine de la catalyse. Nous nous concentrons ici sur une partie des recherches menées au sein du Laboratoire de Catalyse de l'Université de Liège focalisées sur l'utilisation de la caféine comme matière première renouvelable pour la synthèse de catalyseurs biosourcés. Catalysts are involved in many aspects of our daily life, but their true nature remains unknown to the majority of the general public. This article aims to explain what catalysts really are and to present some of their practical applications. Traditionally, catalysts have mainly come from the petroleum industry. This article highlights the principles of green chemistry, which advocates the use of environmentally-friendly resources and their application to the field of catalysis. We focus here on part of the research carried out in the Laboratory of Catalysis at the University of Liège dealing with the use of caffeine as a renewable raw material for the synthesis of biobased catalysts.
      PubDate: Sat, 11 Nov 2023 00:00:00 +010
  • À l’écoute des profondeurs des récifs coralliens de Polynésie : le
           décryptage du whoot

    • Abstract: Les paysages acoustiques englobent des sons d’origine biologique, anthropique et géophysiques. Le monitoring par acoustique passive des écosystèmes marins utilise ces sons pour obtenir des informations sur ces environnements. Les récifs coralliens tropicaux profonds, également connus sous le nom de mésophotiques, sont des habitats peu explorés qui abritent une grande diversité d'espèces de poissons. Les poissons récifaux émettent une variété de sons, dont certains restent encore peu compris. Dans le cadre de cette étude, des enregistrements acoustiques ont été réalisés dans les récifs coralliens mésophotiques de Polynésie française. L'objectif était de caractériser le cycle jour/nuit d’un son particulier préalablement découvert, appelé whoot. L'expédition « Under The Pole III » a offert l’opportunité de collecter des données à l'aide d’enregistreurs acoustiques couplés à des hydrophones, positionnés à différentes profondeurs (−60 m et −120 m) à Bora-Bora, Mangareva, Moorea, Rangiroa, Raroia et Tikehau. Les enregistrements ont ensuite été analysés afin de détecter et de caractériser le cycle jour/nuit du son whoot. Des différences entre les deux profondeurs étudiées et entre les différentes îles étudiées ont été mises en évidence. En général, ce son était principalement présent en début et en fin de nuit, mettant ainsi en évidence son caractère nocturne acoustique chez l’espèce produisant les whoots. Ce résultat devrait contribuer à l’identification de l’espèce de poisson responsable de ce son caractéristique de la scène musicale sous-marine profonde polynésienne, et aider à une meilleure compréhension des populations de poissons des récifs coralliens mésophotiques par l’acoustique passive. Soundscapes include sounds of biological, anthropogenic, and geophysical origin. Passive acoustic monitoring of marine ecosystems utilizes these sounds to gather information about these environments. Deep tropical coral reefs, also known as mesophotic reefs, are understudied habitats that harbor a high diversity of fish species. Reef fish produce a variety of sounds, some of which remain poorly understood. In this study, acoustic recordings were conducted in the mesophotic coral reefs of French Polynesia. The objective was to characterize the diel cycle of a specific previously discovered sound, known as the whoot. The "Under The Pole III" expedition provided the opportunity to collect data using acoustic recorders coupled with hydrophones, positioned at different depths (−60 m and −120 m) in Bora-Bora, Mangareva, Moorea, Rangiroa, Raroia, and Tikehau. The recordings were subsequently analyzed to detect and characterize the day/night cycle of the whoot sound. Differences between the two studied depths and among the different islands were identified. Generally, this sound was predominantly present during the early and late night, highlighting its nocturnal acoustic nature among the species producing the whoot. This result should contribute to the identification of the fish species responsible for this characteristic sound in the deep Polynesian underwater music scene and help improve the understanding of fish populations in mesophotic coral reefs through passive acoustics.
      PubDate: Sat, 11 Nov 2023 00:00:00 +010
  • Minéralogie de la Formation d'Ottré au Thier del Preu et au Thier du
           Mont à Grand-Sart (Lierneux, Belgique), et comparaison avec les autres
           gisements régionaux

    • Abstract: Les deux collines du Thier del Preu et du Thier du Mont, situées au nord du village de Grand-Sart (Lierneux), abritent un gisement de coticule dont la minéralogie est peu connue. Un échantillonnage exhaustif durant plus d'une vingtaine d'années a permis d'y recenser une quarantaine d'espèces minérales, dont certaines très rares comme l’éosphorite et la kolbeckite. La minéralogie de cette zone s'avère donc tout aussi intéressante que celle du premier gisement de coticule où se trouvent les localités minéralogiques bien connues de Bihain, Regné et Ottré. Cet article met également en évidence la complexité et la diversité minéralogique de chacun des trois membres de la Formation d'Ottré à Grand-Sart, et une comparaison est faite avec celle observée dans les autres localités proches où affleurent les mêmes formations géologiques. The Thier del Preu and Thier du Mont hills, located to the north of the village of Grand-Sart (Lierneux), host a coticule deposit which is still exploited today. The mineralogy of this area is not well documented, but during last decades, investigations carried out in the region have made it possible to identify more than 40 mineral species, including rare minerals such as eosphorite and kolbeckite. This paper also shows the complexity and the mineralogical variation of each of the three members of the Ottré Formation at Grand-Sart, and develops a comparison with the mineralogy observed in other typical localities of the region.
      PubDate: Sat, 28 Oct 2023 00:00:00 +020
  • Diversity of hard tick (Acari: Ixodidae) infesting small ruminants in some
           breeding farms in Tizi-Ouzou area (Northern Algeria)

    • Abstract: Ticks are hematophagous arthropods and obligate ectoparasites with a cosmopolitan distribution. They are of great medical and veterinary importance. Studying the composition of the tick fauna is a crucial step in establishing vector control programs. In this context, an inventory of hard ticks infesting small ruminants in the Tizi-Ouzou area was carried out over a one-year period, from December 2020 to November 2021. Using the direct collection technique on the host animal, a total of 663 animals examined, 170 were infested and a total of 1318 adult tick’s specimens were collected in four sampling sites. The result shows a tick diversity comprising six different species. The most abundant species was Rhipicephalus bursa (68.66%), followed by Rhipicephalus sanguineus (29.74%) and Ixodes ricinus (1.36%). Other species were less abundant, each representing only 0,08% of the total abundance. The highest specific richness was recorded in the Ain El Hammam site located at high altitude. A positive correlation was observed between the farms’ altitude and the tick diversity. The result of FCA analysis showed that distribution of ticks is related to altitude and habitat of tick’s species. Les tiques dures sont des arthropodes hématophages et des ectoparasites obligatoires d’une répartition cosmopolite. Elles ont une grande importance d’intérêt médical et vétérinaire. L'étude de la composition de la faune des tiques est une étape cruciale pour établir des programmes de lutte antivectorielle. Dans ce contexte, un inventaire des tiques dures infestant les petits ruminants dans la région de Tizi-Ouzou a été réalisé sur une période d’une année, allant du mois de décembre 2020 au mois de novembre 2021. D’un total de 663 animaux examinés, 170 ont été infestés et un nombre de 1318 spécimens de tiques adultes a été collecté dans quatre sites échantillonnés, en utilisant la technique de la collecte directe sur hôte animal. Le résultat obtenu exprime une richesse de six espèces de tiques. L’espèce la plus abondante a été Rhipicephalus bursa (68,66%), suivie de Rhipicephalus sanguineus (29,74%) et Ixodes ricinus (1,36%). Les autres espèces ont été moins abondantes, elles présentent chacune une abondance de 0,08% de l’abondance totale. La richesse spécifique la plus élevée a été enregistrée dans le site d'Ain El Hammam, situé à haute altitude. Une corrélation positive a été observée entre l'altitude des fermes et la diversité des tiques. Le résultat de l'analyse AFC a montré que la distribution des tiques est liée à l'altitude et à l'habitat des espèces de tiques.
      PubDate: Mon, 23 Oct 2023 00:00:00 +020
  • Le séisme de Mila du 07/08/2020 (Nord-Est algérien) : essai
           d’interprétation de l’activité sismique et des effets induits au
           niveau de la colline d’El Kherba

    • Abstract: La vulnérabilité du site de la ville de Mila aux mouvements de masse est une contrainte majeure devant son développement urbain. Son héritage morphologique explique largement sa dynamique actuelle. Les grandes coulées quaternaires, issues du démantèlement du flanc nord de Marechau, ont dévié l’oued Mila vers l’ouest pour s’enfoncer sous forme d’arc de cercle et dégager la colline d’El Kherba. La massivité de cette dernière a permis l’installation d’une série de ravins (paléo-vallons) parallèles, inégalement creusés. Faute de soutirage efficace, ces derniers ont été comblés. La surface de contact entre la roche en place et le matériau de comblement est restée une semelle de glissement potentielle. Aussi, la fréquence et l’intensité des séismes (probablement en partie induits) sont loin d’être négligeables. En effet, après l’envahissement du site par une urbanisation rapide et massive, les effets induits des derniers séismes ont été probablement amplifiés d’où les dégâts observés. The vulnerability of the site of the city of Mila to mass movements is a major constraint to its urban development. Its morphological heritage largely explains its current dynamics. The large Quaternary flows, resulting from the dismantling of the northern flank of Marechau, have deviated the wadi Mila westwards to sink in the form of an arc and clear the hill of El Kherba. The massiveness of the latter allowed the development of a series of parallel gullies (paleo valleys), unevenly dug. Due to the lack of effective extraction, these gullies were filled in by erosion waste material. The contact surface between the bedrock and the fill material remained a potential failure surface. The frequency and intensity of the (probably partly induced) earthquakes are far from negligible. Indeed, after the invasion of the site by a rapid and massive urbanization, the induced effects of the last earthquakes were probably amplified, hence the damage observed.
      PubDate: Thu, 21 Sep 2023 00:00:00 +020
  • Sociolinguistic Aspects of the Speech Act of Greeting in Persian and

    • Abstract: This paper has been DELETED
      PubDate: Thu, 27 Jul 2023 00:00:00 +020
  • The holoparasitic Orobanchaceae of Tlemcen region (north-western Algeria):
           diversity, distribution and host range

    • Abstract: The knowledge of the holoparasitic Orobanchaceae of Tlemcen region is updated through surveys based on eleven years of fieldwork, analysis and revision of bibliographic information and consultation of the main Herbaria related to the studied area. The detailed distribution in geographical units of the 20 taxa, belonging to the four genera: Boulardia, Cistanche, Orobanche and Phelipanche have been provided, together with habitat description and host plants. We also highlight the presence of taxa with marked chorological interest, rarely cited on the territory, such as O. alba, O. gracilis, O. hederae, P. portoilicitana and P. reuteriana. Note that the species: Cistanche violacea, Orobanche calendulae, Orobanche caryophyllacea, Orobanche reticulata, and Phelipanche cernuahave not been found in the Tlemcen area so far, so we will consider them as conflicting species to be searched.
      PubDate: Sun, 25 Jun 2023 00:00:00 +020
  • The SALT survey of chemically-peculiar hot subdwarfs

    • Abstract: The Southern African Large Telescope (SALT) has surveyed a sample of 300 chemically-peculiar hot subdwarfs with a view to explore evolutionary pathways and connections between a large variety of stars. Observations have been obtained for the entire sample at intermediate resolution to provide classifications and atmosphere parameters, and a smaller sample at high resolution to permit detailed chemical abundance analyses. The first has provided a substantial sample of extremely helium-rich sdO stars, but has also led to significant discoveries of hot white dwarfs, pre-white dwarfs, heavy-metal subdwarfs and extreme helium stars. This paper provides an overview of the current status of the project.
      PubDate: Thu, 25 May 2023 00:00:00 +020
  • The origin of subdwarf B stars

    • Abstract: The origin of subdwarf B stars (sdBs) is unclear. Different formation channels are proposed including: close-binary evolution, helium-mixing on the red giant branch and the hot flasher scenario. Circumstantial evidence exists that sdBs can result from single star evolution in high metallicity populations. We investigate this possibility by using membership in the thin, thick disk and halo populations as a metallicity indicator. Radial velocity measurements were com-bined with Gaia proper motions to calculate space motions in the Galaxy. Galactic orbits and population memberships were derived. Preliminary results indicate more sdBs are members of the thin disk (86 sdBs) than of thick disk and halo (28 sdBs). Apparently single sdBs are found among all three populations. We look into the temperature distributions of the different types and discuss implication for formation scenarios.
      PubDate: Tue, 23 May 2023 00:00:00 +020
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