cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
DLGRAFE-Net: A double loss guided residual attention and feature enhancement network for polyp segmentation
Creators: name: Liu, Jianuo
name: Mu, Juncheng
name: Sun, Haoran
name: Dai, Chenxu
name: Ji, Zhanlin
name: Ganchev, Ivan
Publisher: name: University of Limerick
Year: 2024
Subjects: classificationCode: 40
subject: Engineering

description: Colon polyps represent a common gastrointestinal form. In order to effectively treat and prevent complications arising from colon polyps, colon polypectomy has become a commonly used therapeutic approach. Accurately segmenting polyps from colonoscopy images can provide valuable information for early diagnosis and treatment. Due to challenges posed by illumination and contrast variations, noise and artifacts, as well as variations in polyp size and blurred boundaries in polyp images, the robustness of segmentation algorithms is a significant concern. To address these issues, this paper proposes a Double Loss Guided Residual Attention and Feature Enhancement Network (DLGRAFE-Net) for polyp segmentation. Firstly, a newly designed Semantic and Spatial Information Aggregation (SSIA) module is used to extract and fuse edge information from low-level feature graphs and semantic information from high-level feature graphs, generating local loss-guided training for the segmentation network. Secondly, newly designed Deep Supervision Feature Fusion (DSFF) modules are utilized to fuse local loss feature graphs with multi-level features from the encoder, addressing the negative impact of background imbalance caused by varying polyp sizes. Finally, Efficient Feature Extraction (EFE) decoding modules are used to extract spatial information at different scales, establishing longer-distance spatial channel dependencies to enhance the overall network performance. Extensive experiments conducted on the CVC-ClinicDB and Kvasir-SEG datasets demonstrate that the proposed network out performs all mainstream networks and state-of-the-art networks, exhibiting superior performance and stronger generalization capabilities
Spectroscopic observations of blue stars with infrared excesses in NGC 6611
Creators: name: Bonito, R.
name: Prisinzano, L.
name: Guarcello, M. G.
name: Micela, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The young open cluster NGC 6611 includes among its candidate members a class of peculiar objects with interesting properties: blue stars with infrared IR excesses. These stars show excesses in IR bands, signature of the presence of a circumstellar disk, but optical colors typical of older field stars. In order to confirm their membership to the cluster, it is therefore important to use new spectroscopic observations, together with previous photometric data. We aim at confirming the membership of these objects and at investigating their physical properties to verify whether the observed colors are intrinsic or altered by the presence of the disk or by the accretion processes. We analyze the intermediate resolution spectroscopic data obtained for a subsample of blue stars in NGC 6611 with FLAMES. In particular, we focus on the study of: 1) the profile of the Ha emission line, to select stars with accretion and outflow activity; 2) the Li absorption line, used as a youth indicator; 3) the radial velocity. Using the spectroscopic analysis, it has been possible to investigate the presence of the Li absorption line as well as to discriminate between stars with inert or active disk. In particular, from the analysis of the Ha emission line we were able to infer the activity due to the accretion and outflow processes and the variability of the emission. We also investigated the binarity of the blue stars and their membership to NGC 6611.
description: Accepted for publication in A&A
12 Controle em Foco v3-n5 APLICABILIDADE DA DESCONSIDERACAO DA PERSONALIDADE JURIDICA NO AMBITO DOS TCs.
Creators: name: Ministério Publico de Contas do Estado de Minas Gerais
Publisher: name: Zenodo
Year: 2023

description: O presente artigo tem como objetivo analisar a controversa possibilidade de aplicação da desconsideração da personalidade jurídica na esfera administrativa, sobretudo pelos tribunais de contas. A temática se torna relevante, na medida em que a teoria é amplamente utilizada em outras searas jurídicas e, sendo as cortes de contas órgãos administrativos, no exercício do controle externo, que desempenham importante papel na apuração e apreciação da legalidade dos atos administrativos, bem como na responsabilização dos agentes públicos e privados, surge-se a dúvida se seria compatível a utilização do referido mecanismo com as atribuições dos tribunais de contas. Para o desenvolvimento da pesquisa, faz-se necessário tecer considerações sobre os aspectos gerais da desconsideração, analisar brevemente a discussão doutrinária, com o cotejo dos principais argumentos existentes e analisar o cenário jurisprudencial acerca do tema. Conclui-se, ao final, por admitir a aplicabilidade do instituto, em consonância com a tendência jurisprudencial e doutrinária.
Sparganium simplex Hudson
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: S.simplex Hudson (S.erectum L. em. Wahlenb.) Cat. 334. DieAngabenCollonges,Dorenaz,LeGuercetund EconesindnachGAMSzu bestätigen. 2:Lens (Goudet). - 3:Saas-Fee:FundortdesCat. («petit marais») 1953vernichtet, dagegenArt noch sehr spärlich in den «Bielen» (Hirschmann).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Planar limits of three-dimensional incompressible flows with helical symmetry
Creators: name: Filho, Milton C. Lopes
name: Mazzucato, Anna L.
name: Niu, Dongjuan
name: Lopes, Helena J. Nussenzveig
name: Titi, Edriss S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 5Q35, 65M70

description: Helical symmetry is invariance under a one-dimensional group of rigid motions generated by a simultaneous rotation around a fixed axis and translation along the same axis. The key parameter in helical symmetry is the step or pitch, the magnitude of the translation after rotating one full turn around the symmetry axis. In this article we study the limits of three-dimensional helical viscous and inviscid incompressible flows in an infinite circular pipe, with respectively no-slip and no-penetration boundary conditions, as the step approaches infinity. We show that, as the step becomes large, the three-dimensional helical flow approaches a planar flow, which is governed by the so-called two-and-half Navier-Stokes and Euler equations, respectively.
description: 30 pages
Assessing household vulnerability and coping strategies to floods : a comparative study of flooded and non-flooded areas in Bangladesh, 2005
Creators: name: Rayhan, Israt
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Flood
subject: vulnerability
subject: coping strategy
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: [no abstract]
title: Время, пространство, память в мемуарах русских журналистов конца XIX – начала ХХ вв. А.В. Амфитеатрова и В.М. Дорошевича
Creators: name: Rodigina, Natalia
name: Kuzovkina, Tatiana
Publisher: name: AvtobiografiЯ
Year: 2014

description: This article explores the representations of time and space in the autobiographical prose and memoirs by Alexander Amfiteatrov (1862-1938) and Vlas Doroshevich (1865-1922), famous journalists of early twentieth century Russia, members of the intelligentsia and of the generation of the 1880s. The collective memory and individual memory closely intertwined in their memoirs, reflecting the process of the professional and social self-identification of the Russian intelligentsia. We examine the ‘world of journalism’ and the representations of Moscow and Russia in the memoirs of Alexander Amfiteatrov and Vlas Doroshevich, considering their works as a component of the commemoration practice and political culture of the Russian society.
Aspects of solitons in noncommutative field theories : the modified Ward model
Creators: name: Petersen, Stefan
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2006
Subjects: subject: Noncommutative solitons
subject: stability analysis
subject: adiabatic approximation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
title: Андрей Белый: путь к распятию как аспект серийного самосочинения
Creators: name: Levina-Parker, Masha
Publisher: name: AvtobiografiЯ
Year: 2014

description: Andrey Bely: The Journey to the Crucifixion as an Aspect of Serial Autofiction
This article is an attempt to discern links between Bely’s autobiographical disposition and his narrative devices.  My approach is based on applying two transformist theories of autobiography, namely, the American theory of serial autobiography and the French theory of autofiction. The emphasis of the former theory is on the serial mode of self-representation (multiple versions of self-description and of a life-story in a series of texts); the latter one is focused on the mix of autobiographical and fictional elements with writing techniques. In my research these two theories are combined as a single theory of serial autofiction.
Assessing vulnerability to poverty in fishery dependent communities in Cameroon
Creators: name: Witt, Rudolf
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2009
Subjects: subject: Poverty and vulnerability
subject: portfolio theory and diversification
subject: small-scale fisheries
subject: Sub-Saharan Africa
subject: Cameroon
subject: Armut und Vulnerabilität
subject: Portfolio Theorie und Diversifizierung
subject: Kleinfischerei
subject: Afrika südlich der Sahara
subject: Kamerun
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: [no abstract]
Generating a state t-design by diagonal quantum circuits
Creators: name: Nakata, Yoshifumi
name: Koashi, Masato
name: Murao, Mio
Publisher: name: Bristol : IOP Publishing Ltd.
Year: 2014
Subjects: subject: diagonal quantum circuit
subject: state t-design
subject: random states
subject: k-designs
subject: computation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We investigate protocols for generating a state t-design by using a fixed separable initial state and a diagonal-unitary t-design in the computational basis, which is a t-design of an ensemble of diagonal unitary matrices with random phases as their eigenvalues. We first show that a diagonal-unitary t-design generates a O (1/2(N))-approximate state t-design, where N is the number of qubits. We then discuss a way of improving the degree of approximation by exploiting non-diagonal gates after applying a diagonal-unitary t-design. We also show that it is necessary and sufficient to use O (log(2)(t)) -qubit gates with random phases to generate a diagonal-unitary t-design by diagonal quantum circuits, and that each multi-qubit diagonal gate can be replaced by a sequence of multi-qubit controlled-phase-type gates with discrete-valued random phases. Finally, we analyze the number of gates for implementing a diagonal-unitary t-design by non-diagonal two- and one-qubit gates. Our results provide a concrete application of diagonal quantum circuits in quantum informational tasks.
Grand-Canonical Quantized Liquid Density-Functional Theory in a Car-Parrinello Implementation
Creators: name: Walther, Christian F. J.
name: Patchkovskii, Serguei
name: Heine, Thomas
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Quantized Liquid Density-Functional Theory [Phys. Rev. E 2009, 80, 031603], a method developed to assess the adsorption of gas molecules in porous nanomaterials, is reformulated within the grand canonical ensemble. With the grand potential it is possible to compare directly external and internal thermodynamic quantities. In our new implementation, the grand potential is minimized utilizing the Car-Parrinello approach and gives, in particular for low temperature simulations, a significant computational advantage over the original canonical approaches. The method is validated against original QLDFT, and applied to model potentials and graphite slit pores.
description: 19 pages, 5 figures
Aspects of twistor geometry and supersymmetric field theories within superstring theory
Creators: name: Sämann, Christian
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2006
Subjects: subject: Non-anticommunitative field theory
subject: twistor geometry
subject: string theory
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Sparganium angustifolium Michaux
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: S. angustifolium Michaux (S. affine Schnizl.) 3: ObTörbel (Stebler); oberer Riffelsee bei Zermatt, 2750m, steril (Naegeli, Thellung und Braun- Blanquet 1919 und später viele andere; auch im heissen Sommer 1949 nur steril: Sulger); Hobschensee auf dem Simplon (Garns, Frauenfelder, Becherer). - 4: Riederalp (Christ, Marietan); Binntal: Halsensee am Albrunpass (P.). Ssp. Borderei (Focke) - 2: Schwarzsee nordöstlich Eisten im Lötschental (Kilcher); alter Belalpweg (Lüdi).- 4: Riederfurka-Moosfluh (Lüdi).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
title: Large liver abscess caused by ingestion of fishbone
Creators: name: Ferrão Mendes, Vasco
Publisher: name: EURORAD
Year: 2023
Subjects: subject: Abdominal imaging
subject: Abdomen
subject: Liver
subject: CT
subject: Ultrasound
subject: Clinical Cases

description: Clinical History: An 83-year-old female presented with epigastric pain, nausea, vomiting and a fever of 38.9º C. Physical examination revealed epigastric and left upper quadrant pain on palpation. The laboratorial study showed leucocytosis and a significant increase in C-reactive protein levels.

description: 83 years, female
Automatic text filtering using limited supervision learning for epidemic intelligence
Creators: name: Stewart, Avaré Bonaparte
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Semi-supervised learning
subject: active learning
subject: unsupervised learning
subject: user assessment
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: [no abstract]
Strategic Entrepreneurship in Morocco Navigating Structural Coherence and Diverse Logics in State Led Initiatives and Reconstructions.pdf
Creators: name: zeroual, khalid
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 350203
subject: Financial econometrics

description: Strategic Entrepreneurship in Morocco Navigating Structural Coherence and Diverse Logics in State Led Initiatives and Reconstructions.pdf
Mixing and Transport of Short-Lived and Stable Isotopes and Refractory Grains in Protoplanetary Disks
Creators: name: Boss, Alan P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Analyses of primitive meteorites and cometary samples have shown that the solar nebula must have experienced a phase of large-scale outward transport of small refractory grains as well as homogenization of initially spatially heterogeneous short-lived isotopes. The stable oxygen isotopes, however, were able to remain spatially heterogenous at the $\sim$ 6% level. One promising mechanism for achieving these disparate goals is the mixing and transport associated with a marginally gravitationally unstable (MGU) disk, a likely cause of FU Orionis events in young low-mass stars. Several new sets of MGU models are presented that explore mixing and transport in disks with varied masses (0.016 to 0.13 $M_\odot$) around stars with varied masses (0.1 to 1 $M_\odot$) and varied initial $Q$ stability minima (1.8 to 3.1). The results show that MGU disks are able to rapidly (within $\sim 10^4$ yr) achieve large-scale transport and homogenization of initially spatially heterogeneous distributions of disk grains or gas. In addition, the models show that while single-shot injection heterogeneity is reduced to a relatively low level ($\sim$ 1%), as required for early solar system chronometry, continuous injection of the sort associated with the generation of stable oxygen isotope fractionations by UV photolysis leads to a sustained, relatively high level ($\sim$ 10%) of heterogeneity, in agreement with the oxygen isotope data. These models support the suggestion that the protosun may have experienced at least one FU Orionis-like outburst, which produced several of the signatures left behind in primitive chondrites and comets.
description: 28 pages, 4 tables, 12 figures, in press, ApJ
title: Фрагментация жизни: проза Павла Улитина и смена парадигмы автобиографического письма 1950-1970-х годов
Creators: name: Kukulin, Ilya
Publisher: name: AvtobiografiЯ
Year: 2014

description: This paper is focused on the works of the lesser known Russian avant-guard writer Pavel Ulitin (1918-1986) – perhaps the most radical author of Russian prose of the second half of the 20th century. Ulitin’s hand-made books could be described as collages of photographs, records of Moscow intellectuals’ conversations, autobiographical reflections, and prose poetry; moreover, he included passages in English, German, and French in his texts and used different pseudonyms. His ‘style of hidden plot’ can be found in the experiments of German Dadaism and ‘cut-up technique’ elaborated by William S. Burroughs and Bryon Gysin in the late 50s in Paris. However, Ulitin invented his aesthetic method several years before Burroughs and Gysin, and strived to represent the experience of the Gulag and the failure of utopian projects of the 20th century. He considered any consistent historical and biographical narrative as a form of oblivion of unique personal existence. Thus he seems to be one of the early postmodernists in the European literatures and a predecessor of the experiments of autobiographical writing.
Optical Third-Harmonic Generation in Graphene
Creators: name: Hong, Sung-Young
name: Dadap, Jerry I.
name: Petrone, Nicholas
name: Yeh, Po-Chun
name: Hone, James
name: Osgood, Richard M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report strong third-harmonic generation (THG) in monolayer graphene grown by chemical vapor deposition (CVD) and transferred to an amorphous silica (glass) substrate; the photon energy is in three-photon resonance with the exciton-shifted van Hove singularity at the M-point of graphene. Our polarization- and azimuthal-rotation-dependent measurements confirm the expected symmetry properties for this nonlinear process. Since the third-harmonic signal exceeds that of bulk glass by more than two orders of magnitude, the signal contrast permits background-free scanning of graphene and provides insight into the structural properties of graphene.
description: This paper has been withdrawn by the authors. 20 pages, 5 figures; Posting has been removed due to editorial request
title: Autobiography as Zoegraphy: Dmitrii A. Prigov’s Zhivite v Moskve
Creators: name: Kohl, Philipp
Publisher: name: AvtobiografiЯ
Year: 2014

description: This article discusses Dmitrii Prigov’s autobiographical novel Live in Moscow (Zhivite v Moskve, 2000). Following Giorgio Agamben’s distinction between bios as political life and zoe as biological life, it develops the term ‘zoegraphy’ as a poetological concept. Thus, the article aims to illuminate an aspect hitherto neglected in life-writing studies: autobiographical texts do not only refer to the life of a human subject, but also to non-human forms of life. After outlining a concept of zoegraphical writing, the article points out its narrative and anthropological implications in Prigov’s text.
ניסוי ראשון
Creators: name: Yehya, Karin Haj
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Psychology
subject: FOS: Psychology
subject: Social and Behavioral Sciences

description: זו הרשמה מראש למחקר שלנו במסגרת קורס פסיכולוגיה ניסויית , שלוקחים אותו תוך הלימודים לתואר ראשון בפסיכולוגיה באוניברסיטת תל אביב
Arabic text summarization based on latent semantic analysis to enhance arabic documents clustering
Creators: name: Froud, Hanane
name: Lachkar, Abdelmonaime
name: Ouatik, Said Alaoui
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Retrieval (cs.IR)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Arabic Documents Clustering is an important task for obtaining good results with the traditional Information Retrieval (IR) systems especially with the rapid growth of the number of online documents present in Arabic language. Documents clustering aim to automatically group similar documents in one cluster using different similarity/distance measures. This task is often affected by the documents length, useful information on the documents is often accompanied by a large amount of noise, and therefore it is necessary to eliminate this noise while keeping useful information to boost the performance of Documents clustering. In this paper, we propose to evaluate the impact of text summarization using the Latent Semantic Analysis Model on Arabic Documents Clustering in order to solve problems cited above, using five similarity/distance measures: Euclidean Distance, Cosine Similarity, Jaccard Coefficient, Pearson Correlation Coefficient and Averaged Kullback-Leibler Divergence, for two times: without and with stemming. Our experimental results indicate that our proposed approach effectively solves the problems of noisy information and documents length, and thus significantly improve the clustering performance.
13 Controle em Foco v3-n5 A RELEVÂNCIA DO PLANEJAMENTO NA LEI N. 14.133 - 2021.
Creators: name: Ministério Publico de Contas do Estado de Minas Gerais
Publisher: name: Zenodo
Year: 2023

description: O princípio do planejamento foi colocado em primeiro plano na Lei nº 14.133/2021, trazendo um reforço às ações programadas, de modo a mitigar riscos e evitar compras, obras e contratações de serviços de forma impulsiva. Uma auditoria realizada no Tribunal de Contas da União (TCU) demonstra o quanto a falta de planejamento acarreta em prejuízos econômicos e sociais, com obras paralisadas por todo o país. Os dispositivos que dão ênfase ao planejamento, dentre outros, contidos na Lei nº 14.133/2021, motivam o presente estudo, para que a Administração Pública possa se beneficiar de instrumentos que viabilizem a seleção da proposta mais vantajosa nas licitações e contratações.
title: Опыт детства как преодоление прошлого в современной автобиографической прозе
Creators: name: Balina, Marina
Publisher: name: AvtobiografiЯ
Year: 2014

description: In the 1990s and 2000s, autobiographic life-writing became the territory of intense negotiations between private and historical experiences. Debates about Soviet history supported by the opening of the State archives and resulting in the accessibility of public as well as personal documents, triggered a process of re-conceptualization of private experience into a historical event. Private memory became the territory for the creation of identity that was in close contact with the collective living experience of a generation but was never dominated by it. Two narrative planes, the private and the public that were previously separated, merged together in the unity of one’s life. In this new context, recollections of childhood became increasingly important by giving the reader an opportunity to experience various, often contradictory, dimensions of the author’s self. Two autobiographical recollections of childhood, Pavel Sanaev’s Bury Me Behind the Baseboard, 1996, and Alexander Chudakov’s A Gloom is Cast Upon the Ancient Steps, 2000/2011 are analyzed in the article.
The structure and kinematics of dense gas in NGC 2068
Creators: name: Walker-Smith, S. L.
name: Richer, J. S.
name: Buckle, J. V.
name: Smith, R. J.
name: Greaves, J. S.
name: Bonnell, I. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have carried out a survey of the NGC 2068 region in the Orion B molecular cloud using HARP on the JCMT, in the 13CO and C18O (J = 3-2) and H13CO+ (J = 4-3) lines. We used 13CO to map the outflows in the region, and matched them with previously defined SCUBA cores. We decomposed the C18O and H13CO+ into Gaussian clumps, finding 26 and 8 clumps respectively. The average deconvolved radii of these clumps is 6200 +/- 2000 AU and 3600 +/- 900 AU for C18O and H13CO+ respectively. We have also calculated virial and gas masses for these clumps, and hence determined how bound they are. We find that the C18O clumps are more bound than the H13CO+ clumps (average gas mass to virial mass ratio of 4.9 compared to 1.4). We measure clump internal velocity dispersions of 0.28 +/- 0.02 kms-1 and 0.27 +/- 0.04 kms-1 for C18O and H13CO+ respectively, although the H13CO+ values are heavily weighted by a majority of the clumps being protostellar, and hence having intrinsically greater linewidths. We suggest that the starless clumps correspond to local turbulence minima, and we find that our clumps are consistent with formation by gravoturbulent fragmentation. We also calculate inter-clump velocity dispersions of 0.39 +/- 0.05 kms-1 and 0.28 +/- 0.08 kms-1 for C18O and H13CO+ respectively. The velocity dispersions (both internal and external) for our clumps match results from numerical simulations of decaying turbulence in a molecular cloud. However, there is still insufficient evidence to conclusively determine the type of turbulence and timescale of star formation, due to the small size of our sample.
description: 15 pages, 12 figures. Accepted by MNRAS
Influence of the deposition conditions on the field emission properties of patterned nitrogenated carbon nanotube films
Creators: name: Bonard, Jean-Marc
name: Kurt, Ralph
name: Klinke, Christian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The electron field emission of patterned films of nitrogenated carbon nanotubes is shown to be decisively influenced by the deposition conditions. The growth was carried out by decomposing methane in a nitrogen/ammonia atmosphere using hot filament chemical vapor deposition (CVD). The diameter of the produced tubes depended critically on the distance between substrate and filament, and the field emission properties applied fields needed for electron emission, field amplification factor) could be directly correlated to the film morphology. This demonstrates the possibility of tuning the field emission properties of such film emitters. For arrays of nanotubes thinner than 50 nm, the onset of field emission was observed at about 4 V/um, and a current density of 10 mA/cm2 was obtained for an applied field of 7.2 V/um.
description: 5 pages, 4 figures
The safety and regulatory challenges associated with the geological disposal of higher activity radioactive waste in the United Arab Emirates
Creators: name: Alnuaimi, Abdulla Hashem Saeed Altaghi
Publisher: name: Imperial College London
Year: 2022

description: This thesis explores the nuclear and radiological safety issues associated with the geological disposal of Higher Activity Radioactive Wastes (HAWs) in the United Arab Emirates (UAE), by identifying key safety and technical challenges associated with geological disposal and making suggestions on how some challenges can be overcome to satisfy requirements set by UAE legislative and regulatory bodies. This thesis addresses the importance of having an HAW inventory management system, the characteristics of radioactive waste, interim storage methodologies, the identification of geological environments suitable to host a Geological Disposal Facility (GDF), the UAE’s geological settings, the performance of engineered barrier systems, radiological risk assessments to future generations, the legal and nuclear regulatory system in the UAE relating to radioactive waste management and siting of a GDF and the organisational requirements for the development of a UAE GDF delivering entity. The general outcome from the work performed in this Ph.D. project was that the development of a successful radioactive waste disposal program in the UAE is feasible, and computational modelling was used to indicate that the risk to the environment and future generations from the disposal of HAWs in the UAE are expected to be below set regulatory thresholds. By reviewing international practices in the field of long-term radioactive waste management, it is proposed that the UAE would benefit from implementing a mindset of “the sooner the better” in developing their long-term strategies and management plans to avoid any of the current bottlenecks faced by organisations attempting to deliver such a program. The research presented in this thesis will be of use to the current UAE nuclear energy program and can be seen as forming the preliminary foundations for a HAW disposal program in the UAE.
Toward lead recovery from lead waste acid batteries by deep eutectic solvents
Creators: name: Hasdin, Ornapsorn
Publisher: name: Imperial College London
Year: 2021

description: Lead acid batteries (LABs) can deliver high power, offer robustness, and ease to produce with low maintenance cost. Due to this fact LABS are still the mainstream of the energy storage over other alternative choices. These days, the amount of waste lead acid batteries (WLABs) has undeniably increased due to the expansion of the automotive sector. End-of-life lead disposal has become the major concern. The significant number of WLABs have drawn attention and the challenge is how to recycling the waste properly and efficiently since conventional recycle routes both consume massive energy and release strong acid waste. This thesis addresses the problem by using a greener approach which has been proposed recently. Deep eutectic solvents (DESs) can eliminate the high heat applied, toxic lead soot and concentrated acid. They serve as media for metal extraction and deposition with properties of high solubility of metal salts and wider electropotential window over the aqueous solution. With the aim to recycle WLABs, the fundamental properties and electrochemical behaviour of choline chloride-based DESs of varying HBD composition and their reaction with different lead salts (PbO, PbCO3, PbO2, and PbCl2) were carried out. Thereafter, reline became the solution of choice for lead electrodeposition due to its wide operating range and high solubility for metal. Various parameters that would effect on physicochemical properties and electrochemical behaviour were studied, aiming to optimise the performance. It was found that deposited lead is dependent to mass transport, speciation, applied potential and double layer structure. Furthermore, water doping was exploited to enhance the physicochemical behaviour. 20 wt% H2O reline both with and without PbO powder were studied. The impacts of this aqueous modulation have been investigated; viscosity, conductivity, electropotential window (EPW) and lead solubility as a function of temperature.
Disorder-assisted melting and the glass transition in amorphous solids
Creators: name: Zaccone, Alessio
name: Terentjev, Eugene M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The mechanical response of solids depends on temperature because the way atoms and molecules respond collectively to deformation is affected at various levels by thermal motion. This is a fundamental problem of solid state science and plays a crucial role in metallurgy, aerospace engineering, energy. In glasses the vanishing of rigidity upon increasing temperature is the reverse process of the glass transition. It remains poorly understood due to the disorder leading to nontrivial (nonaffine) components in the atomic displacements. Our theory explains the basic mechanism of the melting transition of amorphous (disordered) solids in terms of the lattice energy lost to this nonaffine motion, compared to which thermal vibrations turn out to play only a negligible role. It predicts the square-root vanishing of the shear modulus $G\sim\sqrt{T_{c}-T}$ at criticality observed in the most recent numerical simulation study. The theory is also in good agreement with classic data on melting of amorphous polymers (for which no alternative theory can be found in the literature) and offers new opportunities in materials science.
Basic studies for sterile filtration processing of therapeutic protein formulations
Creators: name: Haindl, Susanne Maria Hilda
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: Proteinfiltration
subject: Prozessfiltration
subject: Filterfouling
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: The sterilization of protein formulations by filtration was investigated. The influence of process conditions (e.g. temperature) on filter fouling, protein adsorption and scale-up of the filtration process are examined.
Resonant five-body recombination in an ultracold gas of bosonic atoms
Creators: name: Zenesini, Alessandro
name: Huang, Bo
name: Berninger, Martin
name: Besler, Stefan
name: Naegerl, Hanns-Christoph
name: Ferlaino, Francesca
name: Grimm, Rudolf
name: Greene, Chris H.
name: Stecher, Javier Von
Publisher: name: Bristol : IOP Publishing Ltd.
Year: 2013
Subjects: subject: large scattering length
subject: 4-body system
subject: body systems
subject: states
subject: universality
subject: limit
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We combine theory and experiment to investigate five-body recombination in an ultracold gas of atomic cesium at negative scattering length. A refined theoretical model, in combination with extensive laboratory tunability of the interatomic interactions, enables the five-body resonant recombination rate to be calculated and measured. The position of the new observed recombination feature agrees with a recent theoretical prediction and supports the prediction of a family of universal cluster states at negative a that are tied to an Efimov trimer.
Some formulas for the number of gluings
Creators: name: Pastor, A. V.
name: Rodionova, O. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In this paper the number of ways to glue a surface of genus $g$ has been investigated. We've proven formulas for the number of gluings sphere from three polygons and from two bicolored polygons. Moreover, we've given a new proofs on the formulas for the number of gluings sphere and torus from two polygons.
Pharmacological mobilisation of mesenchymal stem/ stromal cells (MSCs) for cardiac repair
Creators: name: Todorova, Veneta Boyanova
Publisher: name: Imperial College London
Year: 2022

description: The healthcare burden of heart failure increases every year, and new therapies are in great demand. Mesenchymal stem/ stromal cell (MSC) transplantation is under investigation as a cell therapy for cardiac repair. Despite encouraging preclinical results, so far only modest effects on heart function were shown by clinical trials investigating this approach. It was suggested that the extensive culture expansion prior to transplantation is hindering the homing and reparative abilities of MSCs. To address this issue, I propose the use of a pharmacological approach to harness the therapeutic potential of MSCs. I hypothesised that increasing MSC mobilisation after MI using drugs could improve cardiac repair. To investigate this, I first showed that endogenous MSCs mobilise into the circulation on day 5 after myocardial infarction (MI) in the rat. This mobilisation was further increased using a combination of two FDA approved drugs: a 5-day pre-treatment using mirabegron (β3-adrenergic receptor agonist), followed by a single dose of AMD3100 (CXCR4 antagonist) (MA). Given in the first 5 days after MI, this therapy resulted in improved global heart function at 5 weeks post injury as shown by our blinded cardiac MRI analysis: increased left ventricular ejection fraction and cardiac output, and decreased end systolic volume. Histological analysis revealed that the MA treated rats had decreased cardiac interstitial fibrosis and increased vascularisation in the border zone of the infarct. Plasma levels of IL-6, TNF-α, and anti-cardiac troponin I autoantibodies were decreased in the MA treated group at 5 weeks post MI. In vitro experiments showed that conditioned media from blood derived MSCs can support angiogenesis in the context of endothelial tube formation and wound healing assays, and that IL-6 and TNF-α decrease the force of contraction in a myocardial slice model. Based on these findings, I propose a novel pharmacological cell therapy for cardiac repair.
Roche volume filling of star clusters in the Milky Way
Creators: name: Ernst, A.
name: Just, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We examine the ratios $r_h/r_J$ of projected half-mass and Jacobi radius as well as $r_t/r_J$ of tidal and Jacobi radius for open and globular clusters in the Milky Way using data of both observations and simulations. We applied an improved calculation of $r_J$ for eccentric orbits of globular clusters. A sample of 236 open clusters of Piskunov et al. within the nearest kiloparsec around the Sun has been used. For the Milky Way globular clusters, data are taken from the Harris catalogue. We particularly use the subsample of 38 Milky Way globular clusters for which orbits have been integrated by Dinescu et al. We aim to quantify the differences between open and globular clusters and to understand, why they form two intrinsically distinct populations. We find under certain assumptions, or, in other words, in certain approximations, (i) that globular clusters are presently Roche volume underfilling and (ii) with at least $3σ$ confidence that the ratio $r_h/r_J$ of half-mass and Jacobi radius is $3 - 5$ times larger at present for an average open cluster in our sample than for an average globular cluster in our sample and (iii) that a significant fraction of globular clusters may be Roche volume overfilling at pericentre with $r_t > r_J$. Another aim of this paper is to throw light on the underlying theoretical reason for the existence of the van den Bergh correlation between half-mass and galactocentric radius.
description: 8 pages, 5+1 figures, accepted by MNRAS
14 Controle em Foco v3-n5 ESTRUTURA DE PRONUNCIAMENTOS PROFISSIONAIS DA INTOSAI E NAO COISAS.
Creators: name: Ministério Publico de Contas do Estado de Minas Gerais
Publisher: name: Zenodo
Year: 2023

description: O objeto da presente investigação é detalhar o novo esquema dos pronunciamentos profissionais da Intosai, introduzidos no portal eletrônico da entidade em 23 de setembro de 2019, eliminando a sistematização por níveis e decidindo pela catalogação em Princípios, Normas e Guias. O artigo aprofunda a discussão sobre o P-50, que trata das Instituições Superiores de Controle com competência jurisdicional, e entre as conclusões infere que o modelo é mais efetivo que as controladorias porque a presença do Juiz e do Ministério Público de Contas qualifica a decisão e incrementa o Estado Democrático de Direito, em razão da independência funcional e imparcialidade das decisões, contribuindo para a essencialidade da atividade de controle externo e perenidade das instituições que a executam. Apoiados no conceito de coisas e não-coisas de Byung-Chul Han, enfatizam a necessidade de os produtos gerados no âmbito dos órgãos de controle externo terem vínculo com a sociedade. Finalmente, os autores alertam que os auditores e julgadores devem estar preparados para uma nova atividade intelectual do controle externo: aferidores das políticas públicas.
Microscopic Theory of Polariton Lasing via Vibronically Assisted Scattering
Creators: name: Mazza, Leonardo
name: Kéna-Cohen, Stéphane
name: Michetti, Paolo
name: La Rocca, Giuseppe C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Polariton lasing has recently been observed in strongly coupled crystalline anthracene microcavities. A simple model is developed describing the onset of the non-linear threshold based on a master equation including the relevant relaxation processes and employing realistic material parameters. The mechanism governing the build-up of the polariton population - namely bosonic stimulated scattering from the exciton reservoir via a vibronically assisted process - is characterized and its efficiency calculated on the basis of a microscopic theory. The role of polariton-polariton bimolecular quenching is identified and temperature dependent effects are discussed.
description: 7 pages main text plus 3 appendices. 10 figures
title: Musorgskij e i ricordi di infanzia: Tracce liriche e musicali in Detskaja
Creators: name: Artoni, Daniele
Publisher: name: AvtobiografiЯ
Year: 2014

description: This essay aims at finding autobiographical traces of Modest Musorgsky’s childhood in his composition Detskaia – The Nursery (1873). Musorgsky is the author of both the music and the lyrics. He structured the piece from a child’s point of view, which is characterised by incoherence and behavioural gaps. This total immersion in the child’s world is further enhanced by the structure of the music, which is free from the western tenets and rich in rhythm variations and dissonant harmonies. Letters, biographies and autobiographical sketches are precious sources for finding connections between the child’s world and Musorgsky’s vision of childhood, based on his own.
External reinforced concrete beam-column joints subjected to monotonic loading
Creators: name: Algassem, Omar
Publisher: name: Imperial College London
Year: 2022

description: This thesis describes an investigation into the response of external reinforced concrete beam-column joints under monotonic loading. The shear force in joints is of concern since it is much higher than that in the adjacent members. The joint shear force is limited by either joint shear failure or flexural failure in the adjoining beam or column. The objectives of the research were both experimental and computational. The main experimental objectives were to study the influence of beam reinforcement detailing, column axial load and joint stirrups on joint shear strength and the mechanisms of joint shear resistance. The computational objectives were to develop a nonlinear finite element modelling procedure for external beam-column joints and to assess previously developed strut and tie (STM) and empirical design methods. To study these parameters, the author carried out a series of tests in the Heavy Structures Laboratory at Imperial College London. Twelve external beam-column joint specimens were tested in three series of four specimens. Series 1 investigated the effect of beam reinforcement anchorage type and bend radius. Series 2 studied the effect of varying the number of joint stirrups and column axial load. Series 3 studied the provision of intermediate column bars as well as the presence and absence of joint stirrups. The shear transfer mechanisms studied in this thesis comprise aggregate interlock, joint shear reinforcement, tension in the bend of the beam reinforcement at its intersection with the critical shear crack and flexural compression. Digital image correlation was used to determine the opening and sliding displacements of the critical shear crack within the joint of each specimen. These displacements were used to assess the contributions of aggregate interlock and joint stirrups to joint shear resistance. Detailed comparisons are presented between the predictions of the developed nonlinear finite element model and the author’s test results. This assessment includes comparisons of measured and predicted load displacement responses and reinforcement strains. The predictions of various strut and tie models and empirical equations proposed by previous researchers are assessed using a large experimental database and conclusions drawn.
Motif Patterns and Coverings of Points with Unit Disks, Part I
Creators: name: Alm, Jeremy F.
name: Hommowun, Nicholas
name: Manary, Elizabeth
name: Schneider, Aaron
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05D99

description: We consider a modification of Winkler's "dots and coins" problem, where we constrain the dots to lie on a square lattice in the plane. We construct packings of "coins" (closed unit disks) using motif patterns.
description: 10 pages, 11 figures
Direct methane to methanol transformation over zeolites - kinetic evaluation and process simulation
Creators: name: Tzouganatos, Ioannis-Dionysios
Publisher: name: Imperial College London
Year: 2022

description: The direct methane to methanol transformation has been a topic of intensive research for many decades. The challenging activation of methane along with the potent overoxidation of methanol at high temperatures renders the development of an efficient catalyst and an industrial process particularly challenging. This thesis aims to extend the understanding of the direct methane to methanol (DMTM) transformation over copper-exchanged mordenite and to suggest an industrially viable process inspired by the findings. A series of experiments led to the development of a laboratorial process over a 3% wt. copper Mordenite catalyst (CuMOR), which maximises the methanol (CH3OH) yield. The suggested step-wise process involves three subsequent steps, specifically a catalyst activation step, a CH4 pre-adsorption step and a reaction and CH3OH desorption at 200oC. A kinetic study of the reaction was carried out. Kinetic equations were derived based on experimental and literature data about the reaction. A model with an added associative CH4 desorption term provided the best fit to the experimental data, while having direct physical meaning. The apparent activation energy of the process was calculated with help of an Arrhenius plot. An industrial application of the process was conceptualised and modelled. A technoeconomic evaluation of the project revealed that under current catalyst performance, the process could never achieve profitability. A comparison of different case scenarios for the performance of the catalyst led to the conclusion that a 40-fold more efficient catalyst is the ideal target for future research with 2.5 years of payback time. Finally, the role of the eight membered rings (8MR) of zeolites in the DMTM was investigated. 4 zeolitic frameworks (Gismondine, Phillipsite, Merlinoite and Edingtonite) containing 4MR and 8MR were synthesised and tested in the reaction. Only the Edingtonite (EDI) framework was able to produce 4.6μmol of CH3OH per gram of catalyst throughout the duration of the experiment, while conclusions were reached regarding the effect of the Si/Al ratio and the zeolite topology on the DMTM.