1,730,920 research outputs found
Sljedeće mjerenje virtualnog Comptonovog raspršenja u MAMI
Get PDFA new ep → epγ experiment is foreseen at MAMI in order to study the Q2 - dependence of the structure functions PLL − PT T /ǫ and PLT and the generalized polarizabilities αE(Q2 ) and βM(Q2 ) of the proton.Predviđamo novo mjerenje ep → epγ u MAMI radi proučavanja Q2 -ovisnosti strukturnih funkcija PLL − PT T /ǫ i PLT te poopćenih polarizabilnosti αE(Q2 ) i βM(Q2 ) protona
Sljedeće mjerenje virtualnog Comptonovog raspršenja u MAMI
Get PDFA new ep → epγ experiment is foreseen at MAMI in order to study the Q2 - dependence of the structure functions PLL − PT T /ǫ and PLT and the generalized polarizabilities αE(Q2 ) and βM(Q2 ) of the proton.Predviđamo novo mjerenje ep → epγ u MAMI radi proučavanja Q2 -ovisnosti strukturnih funkcija PLL − PT T /ǫ i PLT te poopćenih polarizabilnosti αE(Q2 ) i βM(Q2 ) protona
The MAMI Theory: Meta–Architecture of Mind and Invisibility
Get PDFThe Meta–Architecture of Mind and Invisibility (MAMI Theory) offers a structural account of how invisible cognitive, social, and epistemic events are produced, erased, or retained across education, clinical practice, and AI systems. Rather than treating “invisibility” as an individual trait or diagnostic ambiguity, MAMI conceptualizes it as an architectural phenomenon: a patterned interaction between cognitive timing, institutional schemas, and documentation logics. The theory introduces three core constructs—Structural Exposure Theory (SET), Disability Disjunction Theory (DDT), and the Ethics of the Unspoken—to model how certain forms of knowledge fail to enter institutional recognition pipelines. Empirically informed simulations (100 IEP cases, 50 clinical interactions, and 50 AI log patterns) demonstrate three cross–domain invisibility pathways: (1) temporal collapse (processing gaps and timing mismatches), (2) categorical collapse (classification constraints and schema rigidity), and (3) ethical collapse (failures to register unspoken or non–normative signals). The Invisible Retention Rate (IRR) is proposed as a quantitative metric for evaluating how systems either absorb or erase subtle epistemic cues. An Epistemic Collapse Matrix (ECM) models disjunction types and predicts institutional response patterns. The theory argues that current institutional architectures—educational, clinical, algorithmic—systematically under–recognize forms of cognition and communication that fall outside normative timing, visibility, or documentation pathways. MAMI offers a unified framework for detecting, modeling, and ethically responding to structural invisibility, extending implications for disability studies, AI ethics, cognitive science, and the design of future epistemic infrastructures
The MAMI Theory: Meta–Architecture of Mind and Invisibility
No full textThe Meta–Architecture of Mind and Invisibility (MAMI Theory) offers a structural account of how invisible cognitive, social, and epistemic events are produced, erased, or retained across education, clinical practice, and AI systems. Rather than treating “invisibility” as an individual trait or diagnostic ambiguity, MAMI conceptualizes it as an architectural phenomenon: a patterned interaction between cognitive timing, institutional schemas, and documentation logics. The theory introduces three core constructs—Structural Exposure Theory (SET), Disability Disjunction Theory (DDT), and the Ethics of the Unspoken—to model how certain forms of knowledge fail to enter institutional recognition pipelines. Empirically informed simulations (100 IEP cases, 50 clinical interactions, and 50 AI log patterns) demonstrate three cross–domain invisibility pathways: (1) temporal collapse (processing gaps and timing mismatches), (2) categorical collapse (classification constraints and schema rigidity), and (3) ethical collapse (failures to register unspoken or non–normative signals). The Invisible Retention Rate (IRR) is proposed as a quantitative metric for evaluating how systems either absorb or erase subtle epistemic cues. An Epistemic Collapse Matrix (ECM) models disjunction types and predicts institutional response patterns. The theory argues that current institutional architectures—educational, clinical, algorithmic—systematically under–recognize forms of cognition and communication that fall outside normative timing, visibility, or documentation pathways. MAMI offers a unified framework for detecting, modeling, and ethically responding to structural invisibility, extending implications for disability studies, AI ethics, cognitive science, and the design of future epistemic infrastructures
The MAMI Theory: Meta–Architecture of Mind and Invisibility
No full textMAMI Theory (Meta–Architecture of Mind and Invisibility) is a newly developed theoretical framework that maps the invisible cognitive, structural, and epistemic architectures that govern recognition, misrecognition, and the unspoken dimensions of disability, normalcy, and institutional interaction.
The theory introduces:
A multi-layered architecture of invisibility that explains how subjective experience becomes structurally erased or unrecognized.
A model of misrecognition as structural misalignment, identifying why failures persist even when laws, policies, or supports appear adequate.
A meta-design of “normalcy” as a regulatory system that silently governs what may be spoken, interpreted, or legitimized.
The concept of structural triggers—individuals whose presence involuntarily exposes institutional asymmetries and epistemic blind spots.
A classification of invisible epistemic structures, integrating cognitive, ethical, and sociocultural layers into a unified schema.
MAMI Theory aims to reveal why certain lives, voices, and forms of knowledge remain systematically unarticulated or “unwritable” within existing academic, medical, and legal frameworks. It offers a meta-structural approach that complements, extends, and challenges contemporary disability studies, epistemology, cognitive theory, and AI ethics.
This manuscript presents the full theoretical architecture, its internal logic, its mechanisms of epistemic collapse, and its implications for education, diagnosis, institutional design, and the ethics of the unspoken
Photoproduction of pion pairs off nucleons
Get PDFIn the absence of a solution for Quantum Chromodynamics (QCD) in the low energy regime, so called effective models are being used to describe the nucleon and
its excited states. These models include the basic symmetries from QCD, but on the other hand, compared to quarks and gluons, use higher lying degrees of freedom.
Experimental contributions are mandatory to validate these models and fix free parameters. Today still most of the world-data in this field was obtained by
meson-induced excitation of the nucleon. Even though numerous excited states of the nucleon could be identified, the number of model predicted states is much
higher. This is known as the missing resonance problem. One explanation could be that some excited states just couple weakly to pion-N (kaon-N) and hence the
excitation via photons was proposed to further test the model predictions.
During the last 15 years, much experimental effort was made at various photoproduction facilities like MAMI, ELSA, JLab or ESRF and a large number of states
could be confirmed, but the missing resonance problem could not be solved. Higher lying resonances (M > 1.6 GeV) decay preferably via sequential decays with
many meson final states, and especially double pion decay channels are assumed to dominate in this region. The reactions investigated in this work, namely
g+p(n)->pion^0+pion^0+p(n), g+n(p)->pion^0+pion^0+n(p), g+p->pion^0+pion^0+p, g+p(n)->pion^++pion^0+n(n), g+n(p)->pion^-+pion^0+p(p), g+p->pion^++pion^0+n
thus form the primary source of information on photocouplings of higher lying resonances.
This work explores neutral and mixed-charge double pion production channels up to invariant masses of the final state center-of-mass system of about 1.9 GeV
and presents unpolarized as well as single-polarized observables. All results have high precision, are compared to different model predictions, and will
considerably constrain future model analyses in the field of double pion photoproduction and beyond.
The data of this work were taken at MAMI in four different experiments with liquid hydrogen and deuterium targets in 2007 and 2009 and include over 600 hours
of beam time. A longitudinally polarized electron beam was used to produce circularly polarized bremsstrahlung photons with energies up 1.4 GeV. The reaction
products, charged pions, photons and nucleons, were detected in the combined calorimeter consisting of Crystal Ball and TAPS.
Total and differential cross sections, invariant mass distributions of N-pion and pion-pion and beam helicity asymmetries were computed in the fully reconstructed
final state center-of-mass system. Effects from Fermi motion in the deuteron target could be reliably defolded leading to a good agreement between free and
quasifree proton data, and thus the neutron results can be interpreted as a good approximation of free neutron data.
Beam-helicity asymmetries for g+n(p)->pion^0+pion^0+n(p) and g+n(p)->pion^-+pion^0+p(p) have been measured for the first time and published together with the
results from the proton data. Especially for the mixed-charge results, the available model calculations fail to reproduce the data, and for the neutral channel
data, an unexpected similarity for proton and neutron results was observed.
Total and differential cross sections as well as invariant mass distributions of N-pion and pion-pion for g+n(p)->pion^-+pion^0+p(p) have also been measured for
the first time and previous results for g+p(n)->pion^++pion^0+n(n) could be reproduced and extended into the third resonance region
Mami Tucker Husband
No full textAudio recording of Mami Tocker (Mami Toka) being interviewed; discussion is primarily about her relationship with her husband
Neutron and synchrotron radiation for science and technology symposium
No full textCo-organisation d'un Symposium international dans le cadre du réseau européen MaMi - magnetics and microhydrodynamics Innovative Training Network ITN Horizon H2020 MAMI : Symposium Neutron & Synchrotron Radiation for Science & Technology. Conférence CEA du 13/12/2021 au 14/12/202
Ridha Mami. Entrevista realizada por Vicente E. Montes
No full textEntrevista realizada en la Universidad de Oviedo vinculada al proyecto “Desde las dos orillas. La literatura francesa y las literaturas africanas en el siglo XXI”Ridha Mami es un poeta tunecino, docente e investigador en la Universidad de Manouba (Túnez). Es especialista en literatura aljamiado-morisca. Entre sus obras destacan los poemarios Lunas de primavera (2011), Lunas de otoño (2013), Mis lunas (2015) y antologías poéticas de autores tunecinos, como Antología de poesía tunecina contemporánea(2019). También ha publicado un gran número de artículos científicos.Aplicaciones on-line para el curso “Desde las dos orillas. La literatura francesa y las literaturas africanas en el siglo XXI” (PINN-18-A/O-65
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