Alien Registration- Jordan, Maud (Old Town, Penobscot County)

https://digitalmaine.com/alien_docs/5928/thumbnail.jp

Dark matter and lepton flavour phenomenology in a singlet-doublet scotogenic model

We study the dark matter phenomenology of scotogenic frameworks through a rather illustrative model extending the Standard Model by scalar and fermionic singlets and doublets. Such a setup is phenomenologically attractive since it provides the radiative generation of neutrino masses, while also including viable candidates for cold dark matter. We employ a Markov Chain Monte Carlo algorithm to explore the associated parameter space in view of numerous constraints stemming from the Higgs mass, the neutrino sector, dark matter, and lepton-flavour violating processes. After a general discussion of the results, we focus on the case of fermionic dark matter, which remains rather uncovered in the literature so far. We discuss the associated phenomenology and show that in this particular case a rather specific mass spectrum is expected with fermion masses just above 1 TeV. Our study may serve as a guideline for future collider studies

Alien Registration- Jordan, Maud (Old Town, Penobscot County)

https://digitalmaine.com/alien_docs/5928/thumbnail.jp

Off-rift Axis Channelized Melt and Lithospheric Metasomatism along Mid-ocean Ridges—A Case Study from Iceland on the Limits of Melt Channelling

Magmatism in Iceland is classically explained by the interaction of the mid-Atlantic ridge with the Iceland plume. The growth of Iceland through time is the result of volcanic activity at the rift axis. However, Holocene volcanism (0-11.5 ka) is not restricted to the Rift Zone but also occurs off-axis, specifically in the western Snæfellsnes Volcanic Belt and in the Southern Flank Zone. The rift and off-axis postglacial volcanic zones are separated by a gap of ~60-80 km. While the volcanic activity of the Southern Flank Zone seems correlated with the actual location of the Iceland plume, the plume relation to the Snæfellsnes Volcanic Belt is uncertain. To address the origin and relationships between rift and off-rift magmas, we present new data from two transects perpendicular to the Reykjanes Rift. The lavas in the Snæfellsnes Volcanic Belt are characterized by transitional to alkaline compositions, with elevated incompatible trace element content. In contrast, the Rift Zone volcanic rocks have tholeiitic compositions with trace element signatures slightly more enriched than MORB. Rift and off-rift Iceland lavas are all characterized by positive Ba and Nb anomalies, particularly in alkaline rocks. Tholeiitic and alkaline lavas show distinct differentiation sequences, with the main difference being the delayed crystallisation of plagioclase in the fractionating assemblage of alkaline magmas. We apply these sequences to calculate primary magma compositions, which are then used to constrain melting conditions. Geochemical modelling indicates that Iceland rift and off-rift magmas can be produced from a peridotitic mantle source if lithospheric processes are involved. We demonstrate that recycled crust in the form of pyroxenite is not required to generate Snæfellsnes alkaline lavas. The low solidus temperature and high productivity of pyroxenite favours early and more extensive melting producing primary magmas which are not sufficiently enriched in incompatible trace elements to explain the compositional variation of Snæfellsnes magmas. An alternative mechanism to involve pyroxenite in the source of Snæfellsnes lavas relates to the hybridization of recycled oceanic crust with peridotite, but such reacted pyroxenite requires specific compositions to reproduce the Ba and Nb anomalies. As an alternative, we suggest that Snæfellsnes alkaline lavas are the result of channelized low-degree melts produced on the periphery of the melting column at distances exceeding 65 km from the ridge axis. These melts accumulate and percolate into the lithosphere producing amphibole ± phlogopite-bearing hydrous cumulates. Incongruent melting of these cumulates via re-newed magmatic activity and melt-peridotite reaction can reproduce the alkaline compositions observed in the Snæfellsnes Volcanic Belt, including the Ba and Nb anomalies. Numerical simulations of melt extraction below mid-ocean ridges suggest that low-degree melts produced as far as ~65km from the central ridge axis rise vertically to the base of the lithosphere and are then focussed towards the ridge axis in decompaction channels. We propose that these melts interact with hydrous cumulates previously formed during the development of decompaction channels at the lithosphere-asthenosphere boundary and acquire specific Ba and Nb anomalies. The mixing of these distal enriched melts with more depleted melts extracted from the central part of the melting regime explains the composition of Rift Zone lavas. Alkaline lavas observed in the Southern Flank Zone show numerous analogies with the Snæfellsnes magmas, suggesting that similar lithospheric processes control their chemistry. The high thermal regime in Iceland and thick lithosphere explains the difference between Icelandic tholeiite and typical MORB. Our results highlight the importance of mantle dynamics below mid-ocean ridges and lithospheric interaction to produce off-axis magmatism with enriched alkaline signatures

Dark matter and lepton flavour phenomenology in a singlet-doublet scotogenic model

International audienceWe study the dark matter phenomenology of scotogenic frameworks through a rather illustrative model extending the Standard Model by scalar and fermionic singlets and doublets. Such a setup is phenomenologically attractive since it provides the radiative generation of neutrino masses, while also including viable candidates for cold dark matter. We employ a Markov Chain Monte Carlo algorithm to explore the associated parameter space in view of numerous constraints stemming from the Higgs mass, the neutrino sector, dark matter, and lepton-flavour violating processes. After a general discussion of the results, we focus on the case of fermionic dark matter, which remains rather uncovered in the literature so far. We discuss the associated phenomenology and show that in this particular case a rather specific mass spectrum is expected with fermion masses just above 1 TeV. Our study may serve as a guideline for future collider studies

Induction of heme oxygenase-1 in factor VIII–deficient mice reduces the immune response to therapeutic factor VIII

International audienc

Permafrost Expedition in Alsaka: Autumn 2023 and Winter 2024

What are the consequences of permafrost thaw for carbon fluxes as a function of seasonal changes in (i) biogeochemical processes, (ii) mineral-organic carbon interactions, (iii) ecosystem functioning and (iv) atmospheric conditions. This is what the Permafrost Team of UCLouvain is investigating through field-based research at Eight Mile Lake in Alaska, USA, crossing geochemistry with collaborations in geophysics, geomatics & climatology.

Exploring the value and acceptability of peer support in the process of improving adherence to HIV antiretroviral drugs in Tanzania, Dar-es-Salaam

Challenge: A way to understand and instruct on best practices for delivering and accepting HIV drug treatments in Africa. This transdisciplinary team focused on the problem of continuously rising levels of HIV drug resistance in Africa that as a result can lead to increased rates of mortality and morbidity. The main source of the HIV drug resistance problem is believed to be insufficient adherence to therapy. The challenge submitter suggested to explore whether improving the relationship between patient and health-care provider would be the next best step to improve adherence. However, after gathering knowledge from different sources, it was found that the burden on local doctors was already very high and would only increase in the coming years. A better relationship with the patient would be an extra burden on the time of health personnel. Instead, the team researched the feasibility of implementing peer support groups in Dar Es Salaam, Tanzania, as a possible way to increase patient adherence. With the creation of a questionnaire, a first step was taken in researching the value and acceptability of peer support groups in combating problems with adherence in regions where time constraints on skilled health workers limit possible interventions

Exploring the value and acceptability of peer support in the process of improving adherence to HIV antiretroviral drugs in Tanzania, Dar-es-Salaam

Challenge: A way to understand and instruct on best practices for delivering and accepting HIV drug treatments in Africa. This transdisciplinary team focused on the problem of continuously rising levels of HIV drug resistance in Africa that as a result can lead to increased rates of mortality and morbidity. The main source of the HIV drug resistance problem is believed to be insuf cient adherence to therapy. The challenge submitter suggested to explore whether improving the relationship between patient and health-care provider would be the next best step to improve adherence. However, after gathering knowledge from different sources, it was found that the burden on local doctors was already very high and would only increase in the coming years. A better relationship with the patient would be an extra burden on the time of health personnel. Instead, the team researched the feasibility of implementing peer support groups in Dar Es Salaam, Tanzania, as a possible way to increase patient adherence. With the creation of a questionnaire, a rst step was taken in researching the value and acceptability of peer support groups in combating problems with adherence in regions where time constraints on skilled health workers limit possible interventions.status: Published onlin