Bibliographies thématiques / Allophagy

Littérature scientifique sur le sujet « Allophagy »

Auteur : Grafiati
Publié le 25 mai 2024

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Articles de revues sur le sujet "Allophagy"

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Al Rawi, Sara, Sophie Louvet-Vallée, Abderazak Djeddi, Martin Sachse, Emmanuel Culetto, Connie Hajjar, Lynn Boyd, Renaud Legouis et Vincent Galy. « Allophagy ». Autophagy 8, no 3 (19 mars 2012) : 421–23. http://dx.doi.org/10.4161/auto.19242.

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Simamora, Jupri, Purba Marpaung et Alida Lubis. « DETERMINATION TYPE OF ALLOPHANE ON ANDISOL IN DOLAT RAKYAT VILLAGE TIGA PANAH DISTRICT, REGENCY OF KARO ». Jurnal Pertanian Tropik 2, no 3 (1 décembre 2015) : 228–38. http://dx.doi.org/10.32734/jpt.v2i3.2916.

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The aim of the research was to determinate the type of Allophane minerals by means of Thermogram and to know the type of Allophane minerals with Allophane–Organic Matter relations. The research was done in Dolat Rakyat villages, District of Tiga Panah Karo Regency, In Soil Fertility Laboratory University of North Sumatera, and College of Chemical Industry (PTKI), Medan in June - October 2014. Soil type is Andisol. The result of the research in Dolat Rakyat Village Tiga Panah District, Regency of Karo Thermogram interpretation showed that type of Allophane minerals Andisol that is Allophane B. Allophane-Organic Matter relations showed that type of Allophane minerals is Allophane B with positive relations between Allophane-Humic Acid; negative relations between Allophane-Fulvic Acid, and Allophane-Humic Acid+Fulvic Acid.
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Airlangga, Tandaditya Ariefandra, Naoto Matsue, Eko Hanudin et Erni Johan. « Phosphate Adsorption Capacity of Allophane from Two Volcanic Mountains in Indonesia ». JOURNAL OF TROPICAL SOILS 25, no 1 (2 janvier 2020) : 39. http://dx.doi.org/10.5400/jts.2020.v25i1.39-46.

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Allophane is known as clay mineral with high capacity of phosphate adsorption via ligand-exchange mechanism. This study aims to compare the phosphate adsorption characteristics by allophane from Mt. Merapi and Mt. Lawu in relation to its chemical and mineralogical properties. The results of X-Ray Flourescence analysis shows that both allophane samples from Merapi and Lawu have low Si/Al ratio, i.e. 1.18 and 1.16, respectively. Infrared spectral characteristics of the allophane materials indicated that the main adsorption bands appeared at the range of 2700-3700 cm-1 (due to stretching vibration of all hydroxyl (OH) groups), 1400 – 1800 cm-1 (vibration of HOH deformation), and 650 - 1200 cm-1 (vibration between the Si-O-Al). Adsorption experiment of phosphate on allophane samples were conducted at initial adsorbate concentration of up to 2.0 mM and at pH 4.0 and 8.0. Phosphate adsorption capacity of allophane shows that both allophane from Merapi and Lawu are categorized as very high in adsorbing phosphate and fit well with the Langmuir adsorption equation. Phosphate adsorption increases with decreasing pH due to the positive charge sites such as Al-OH2+ in the allophane structure increase. Another reason is the negative charge of phosphate gradually decreases from -2 to -1 with decreasing pH, and the repulsive force between the negatively charged Si-O- in the allophane structure and phosphate anions decreases.
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Singleton, PL, M. Mcleod et HJ Percival. « Allophane and halloysite content and soil solution silicon in soils from rhyolitic volcanic material, New Zealand ». Soil Research 27, no 1 (1989) : 67. http://dx.doi.org/10.1071/sr9890067.

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The relationship between Si in soil solution and allophane and halloysite content was studied by using a drainage sequence of three New Zealand soils from rhyolitic volcanic alluvium. Clay mineralogy was compared with soil colour and drainage. Allophane and halloysite contents of two morphologically similar soils from rhyolitic volcanic ash were also studied and possible reasons for differences in mineralogy were determined. Allophane was estimated by acid oxalate and pyrophosphate dissolution. The Al/Si ratio of the allophane was determined and the allophane content of the soil was estimated from the Si extracted in acid-oxalate. Halloysite was estimated by differential thermal analysis of the whole soil. Soil samples were centrifuged with a dense water-immiscible organic liquid to displace the soil solution from between soil particles. The Si in soil solution was then determined by spectrophotometry. Allophane was predominant when Si in soil solution was <10gm-3, and halloysite was predominant when Si in soil solution was >10gm-3. Low Si in soil solution and the presence of allophane was associated with well drained horizons which could be identified by their ochreous colour. High Si in soil solution, the absence of allophane and predominance of halloysite, was associated with poorly drained horizons. These horizons could be identified by their pale colour (chroma <2). In two morphologically similar soils, the change from allophane dominance in one soil to hahoysite dominance in the other soil also corresponded to an increase in Si in soil solution. This was probably the result of slightly slower horizon permeability which increased Si in soil solution to a level favouring halloysite formation.
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Rois, Ibnu, Pranoto Pranoto et Sunarto Sunarto. « APLIKASI ALOFAN DALAM TANAH ANDISOL SEBAGAI ADSORBEN UNTUK MENURUNKAN BAKTERI Coliform LIMBAH CAIR DOMESTIK ». EnviroScienteae 14, no 2 (15 octobre 2018) : 99. http://dx.doi.org/10.20527/es.v14i2.5475.

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Research on allophane has been done as an adsorbent to decrease MPN Coliform in domestic wastewater. The purpose of this study was to look for natural adsorbent materials that can be used to decrease MPN Coliform. Natural allophane was identified from andisol soil by pH analysis of NaF, FTIR, XRD, and SAA. The result of the analysis showed that there was allophane on andisol soil with pH 11,73. The diameter of empty space or alloy pores of 5 nm with a hole/pore size of 0.5 nm. Testing of MPN Coliform is done by method of Most Probable Number (MPN) variety 5: 5: 5. Based on the result of the research, allophane adsorbent can decrease MPN Coliform by 60.9%.
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He, N., T. L. Barr et J. Klinowski. « ESCA and solid-state NMR studies of allophane ». Clay Minerals 30, no 3 (septembre 1995) : 201–9. http://dx.doi.org/10.1180/claymin.1995.030.3.04.

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AbstractThe surface/near-surface chemistry of allophane has been studied by X-ray photoelectron spectroscopy (ESCA) and the bulk material by 27A1 and 29Si solid-state NMR and other techniques. The surface/near-surface Si/Al ratio of allophane is c.1.0, similar to that for kaolinite, zeolite Na-A and sodalite. The core level binding energies for kaolinite and allophane are almost identical, but quite different from those for zeolite Na-A and sodalite, both framework aluminosilicates. The nature and size of these differences is consistent with the differences between the chemistry of sheet and framework silicates. The small variations in the Si(2p) spectra for kaolinite and allophane are discussed in terms of bonding of the tetrahedral units in the two materials.
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Hashizume, H., et B. K. G. Theng. « Adsorption of DL-alanine by allophane : effect of pH and unit particle aggregation ». Clay Minerals 34, no 2 (juin 1999) : 233–38. http://dx.doi.org/10.1180/000985599546190.

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AbstractThe adsorption of DL-alanine at pH 4, 6 and 8 by a soil allophane has been determined. Two sets of experiments were carried out: (1) in which the allophane had been kept in a moist state throughout; and (2) in which the mineral had previously been dried at 50°C. In both instances, the adsorption isotherms showed three distinct regions as the concentration of alanine in solution was increased: (1) an initial, nearly linear, rise at low equilibrium concentrations; (2) a levelling off to a plateau at intermediate concentrations; and (3) a steep linear increase at high concentrations. For comparable concentrations of alanine in solution, adsorption decreased in the order pH 6 > pH 8 > pH 4. Irrespective of pH, however, more alanine was adsorbed by the ‘wet’ allophane than by its ‘dry’ counterpart. These observations are interpreted in terms of the morphology and aggregation of allophane unit particles together with the pH-dependent charge characteristics of allophane and alanine. The results are compared with published data on the adsorption of alanine by montmorillonite.
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Cichota, R., I. Vogeler, N. S. Bolan et B. E. Clothier. « Cation influence on sulfate leaching in allophanic soils ». Soil Research 45, no 1 (2007) : 49. http://dx.doi.org/10.1071/sr06070.

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We have examined the influence of the ionic composition of the soil solution on the movement of sulfate and calcium in 2 New Zealand soils with differing allophane content. For this study, we have carried out a series of miscible displacement experiments using repacked and intact soil columns, in which sulfate was applied in the presence of either calcium or potassium as the accompanying cation. Our results showed that sulfate leaching was significantly retarded in the soil with higher allophane content when applied with calcium. On the other hand, no effects were observed for all studied soils when potassium was used as the accompanying cation. In addition, in soils with high allophane content, calcium also had its retention increased when sulfate was present. The increase in sulfate adsorption was accompanied by corresponding increase in calcium adsorption. These findings evidenced the presence of co-adsorption, or ion-pair adsorption (IPA), in allophane-containing soils. The extent of this adsorption is dependent on the soil pH, the accompanying cation, and the allophane content of the soil.
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Silva-Yumi, Jorge, Roberto Cazorla Martínez, Carlos Medina Serrano et Gabriela Chango Lescano. « Allophane, a natural nanoparticle present in andisols of equatorial Ecuador, properties and applications ». Characterization and Application of Nanomaterials 5, no 1 (17 avril 2022) : 89. http://dx.doi.org/10.24294/can.v5i1.1689.

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Allophane is a natural nanoparticle present in soils of volcanic origin such as andisols, which are distributed around the world in countries with volcanic activity. In Ecuador, andisols constitute 30% of the territory in high and humid areas of the northern highlands. Allophane can be obtained from andisols through physical and chemical processes, or it can be synthesized. This nanomaterial has multiple properties for various applications in different areas. There is a lot of research on these nanoparticles and this type of soils, but they have not been studied yet in Ecuador. In this article, the structural characteristics, properties, formation, isolation, synthesis and uses of allophane are presented, with the finish of generating knowledge and encouraging research on these soils that are the source of the aforementioned nanoparticle. The literature search was performed in Science Direct and Google Scholar databases, and high impact articles related to natural or synthetic allophane research were used. The particular characteristics that allophane has allows it to be used as an environmental remediator, bactericide, anti-inflammatory, flame retardant, enzyme support, but in addition it has been studied in catalysis, photocatalysis and electrocatalysis. Considering the area covered by allophane in the Ecuadorian territory and its availability, it can be used for research based on international studies that have been developed to take advantage of it in the environmental and medical areas.
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Hojamberdiev, Mirabbos, Yuki Makinose, Kenichi Katsumata, Toshihiro Isobe, Nobuhiro Matsushita et Kiyoshi Okada. « Hydrothermal Synthesis and Visible-Light-Driven Photocatalytic Activity of Allophane – Wakefieldite-(Ce) Composite ». Advanced Materials Research 896 (février 2014) : 545–48. http://dx.doi.org/10.4028/www.scientific.net/amr.896.545.

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In this study, highly adsorptive mechanically-mixed and as-synthesized allophane–wakefieldite-(Ce) composites were prepared by mechanical mixing and hydrothermal synthesis, respectively. The results from X-ray diffraction and Raman spectroscopy analyses show that the mechanically-mixed composite has higher crystallinity than the as-synthesized composite. The nanoparticles of wakefieldite-(Ce) were homogenously distributed with allophane in the as-synthesized composite. The specific surface areas of the mechanically-mixed and as-synthesized composites are 164 m2/g and 191 m2/g, respectively. The photocatalytic activity of the samples was evaluated for the degradation of acetaldehyde (AcH) gas under visible light. Both composites demonstrated higher photocatalytic activity than individual wakefieldite-(Ce) and allophane because allophane in the composites played an important role in the adsorption of acetaldehyde gas molecules and the mediation between the gas phase and the wakefieldite-(Ce) surface.
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Thèses sur le sujet "Allophagy"

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Boruta, Luc. « Indicators of allophony and phonemehood ». Paris 7, 2012. http://www.theses.fr/2012PA070089.

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Bien que nous ne distinguions qu'un nombre fini et restreint de catégories de sons (les phonèmes d'une langue donnée), les sons des messages que nous recevons ne sont jamais identiques. Etant donnée l'ubiquité des processus allophoniques à travers les langues et le fait que chaque langue dispose de son propre inventaire phonémique, quels types d'indices les nourrissons, par exemple anglophones, pourraient-ils exploiter pour découvrir que [siŋki ] et [θiŋki ] (sinking vs. Thinking) ne peuvent pas dénoter la même action ? Le travail présenté dans cette thèse prolonge les travaux initiés par Peperkamp et al. (2006) concernant la définition de mesures de dissimilarité phone à phone indiquant quels phones sont des réalisations d'un même phonème. Nous montrons que résoudre la tâche proposée par Peperkamp et al. (2006) concernant la définition de mesures de dissimilarité phone à phone indiquant quels phones sont des réalisations d'un même phonème. Nous montrons que résoudre la tâche proposée par Peperkamp et al. (2006) concernant la définition de mesures de dissimilarité phone à phone indiquant quels phones sont des réalisations d'un même phonème. Nous montrons que résoudre la tâche proposée par Peperkamp et al. N'apporte pas une réponse complète au problème de l'acquisition des phonèmes, principalement parce que des limitations empiriques et formelles résultent de sa formulation phone à phone. Nous proposons une reformulation du problème comme un problème d'apprentissage automatique non-supervisé par partitionnement reposant sur le positionnement multidimensionnel des données. Les résultats de diverses expériences d'apprentissage supervisé et non-supervisé indiquent systématiquement que de bons indicateurs d'allophonie ne sont pas nécessairement de bons indicateurs de phonémicité. Dans l'ensemble, les résultats computationnels présentés dans ce travail suggèrent qu'allophonie et phonémicité ne peuvent être découvertes à partir d'informations acoustique, temporelle, distributionnelle ou lexicale que si, en moyenne, les phonèmes présentent peu de variabilité
Although we are only able to distinguish between a finite, small number of sound categories -a given language's phonemes- no two sounds are actually identical in the messages we receive. Given the pervasiveness of sound-altering processes across languages -and the fact that every language relies on its own set of phonemes- what kind of cues may, for example, English-learning infants rely on to learn that [siŋki ] and [θiŋki ] (i. E. Sinking thinking) can not refer to the same action ? The work presented in this dissertation builds upon the line of computational studies initiated by Peperkamp et al; (2006), wherein research efforts have been concentrated on the definition of sound-to-sound dissimilarity measures indicating which sounds are realizations of the same phoneme. We show that solving Peperkamp et al. 's task does not yield a full answer to the problem of the discovery of phonemes, as formal and empirical limitations arise from its pairwise formulation. We proceed to circumvent these limitations, reducing the task of the acquisition of phonemes to a partitioning-clustering problem and using multidimensional scaling to allow for the use of individual phones as the elementary objects. The results of various classification and clustering experiments consistently indicate that effective indicators of allophony are not necessarily effective indicators of phonemehood. Altogether, the computational results we discuss suggest that allophony and phonemehood can only be discovered from acoustic, temporal, distributionall, or lexical indicators at low allophonic complexities, i. E. When -on average- phonemes do not have many allophones in the quantized representation of the input
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Hagerup, Asger. « A Phonological Analysis of Vowel Allophony in West Greenlandic ». Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for språk- og kommunikasjonsstudier, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12625.

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A typological peculiarity that West Greenlandic and other Inuit languages exhibit is that they have very few underlying segments. This is especially true for the vowels, of which there are only three. However, the allophonic variation of these three vowels is considerable. In this thesis I investigate the different vowel qualities arising through allophonic variation in West Greenlandic, and propose phonological patterns that are subsequently analysed in the framework of Optimality Theory. The analysis will show that the allophonic variation the vowels exhibit can be explained by the place of articulation of the consonants surrounding the vowel. In addition to this I will compare the phonological structures of Element Phonology with other thories of representation.
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Noguchi, Masaki. « Acquisition of allophony from speech input by adult learners ». Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58108.

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Sound systems are a basic building block of any human language. An integral part of the acquisition of sound systems is the learning of allophony. In sound systems, some segments are used as allophones, or contextually-conditioned variants of a single phoneme, and learners need to figure out whether given segments are different phonemes or allophones. There is a growing interest in the question of how allophony is learned from speech input (e.g., Seidl and Cristia, 2012). This dissertation investigates the mechanisms behind the learning of allophony. Whether given segments are different phonemes or allophones of a single phoneme is partly determined by the contextual distribution of the segments. When segments occur in overlapping contexts and their occurrences are not predictable from the contexts, they are likely to be different phonemes. When segments occur in mutually exclusive contexts, and their occurrences are predictable from the contexts (i.e., they are in complementary distribution), the segments are likely to be allophones. This dissertation starts with the hypothesis that allophony can be learned from the complementary distribution of segments in input. With data collected in a series of laboratory experiments with adult English speakers, I make the following claims. First, adults can learn allophony from the complementary distribution of segments in input. The results of Experiment 1 showed that participants learned to treat two segments as something like allophones when they were exposed to input in which the segments were in complementary distribution. Second, the learning of allophony is constrained by the phonetic naturalness of the patterns of complementary distribution. The results of Experiment 2 showed that the learning of allophony happened only when participants were exposed to input in which relevant segments occurred in phonetically natural complementary contexts. Third, the learning of allophony involves the learning of the context-dependent perception of relevant segments. The results of Experiment 3 showed that, through exposure to input, participants’ perception of the relevant segments became more dependent on context such that they perceived the segments as being more similar to each other when they heard the segments in phonetically natural complementary contexts.
Arts, Faculty of
Linguistics, Department of
Graduate
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Hall, Kathleen Currie. « A Probabilistic Model of Phonological Relationships from Contrast to Allophony ». The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250228987.

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Bauer, McNeill John. « Multivariate Analysis of Factors Regulating the Formation of Synthetic Allophane and Imogolite Nanoparticles ». Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93330.

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Imogolite and allophane are nanosized aluminosilicates with high value in industrial and technological applications, however it remains unclear what factors control their formation and abundance in nature and in the lab. This work investigated the complex system of physical and chemical conditions that influence the formation of these nanominerals. Samples were synthesized and analyzed by powder x-ray diffraction, in situ and ex situ small angle x-ray scattering, and high-resolution transmission electron microscopy. Multivariate regression analysis combined with linear combination fitting of pXRD patterns was used to model the influence of different synthesis conditions including concentration, hydrolysis ratio and rate, and Al:Si elemental ratio on the particle size of the initial precipitate and on the phase abundances of the final products. The developed models described how increasing Al:Si ratio, particle size, and hydrolysis ratio increased the proportion of imogolite produced, while increasing the concentration of starting reagents decreased the final proportion. The model confidences were >99%, and explained 86 to 98% of the data variance. It was determined from the models that hydrolysis ratio was the strongest control on the final phase composition. The models also were able to consistently predict experimentally derived results from other studies. These results demonstrated the ability to use this approach to understand complex geochemical systems with competing influences, as well as provided insight into the formation of imogolite and allophane.
Master of Science
Allophane and imogolite are nanosized aluminosilicate minerals and strongly control the physical and chemical behavior of soil. They hold promise for use in technological applications. In nature, allophane and imogolite are often observed together in varying proportions. Similarly, laboratory synthesis by various methods usually does not result in pure phases. These observations suggest they form at the same time, at a wide range of solution chemical conditions. It remains unclear what factors determine how and when these phases form in solution, which limits our understanding of their occurrence in nature and the laboratory. The objective of this study is to understand and explain what solution chemical and physical conditions control the formation of synthetic imogolite and allophane. We did this by utilizing a unique approach where we systematically varied starting conditions of formation of these particles, and then used analytic and statistical methods to develop a model that describes the relationship between each of the starting conditions – concentration, size, pH, atomic ratios, and hydrolysis ratios, and how those affect the phase abundance of the particles.
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Stevenson, Sophia Diana. « The Strength of Segmental Contrasts : A Study on Laurentian French ». Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32179.

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The dichotomy of contrastive and allophonic phonological relationships has a long-standing tradition in phonology, but there is a growing body of research (see Hall, 2013, for a review) that points to phonological relationships that fall between contrastive and allophonic. The criteria most commonly used to define phonological relationships or resolve cases of ambiguous phonological relationships – namely (a) predictability of distribution, and (b) lexical distinction – are not always able to account for observed sound patterns. The main goal of this dissertation is to identify and apply quantitative measures (relative frequency and minimal pair counts) to the traditional criteria in order to better account for cases of intermediate phonological relationships or, in other words, to account for different strengths and degrees of contrast. Twenty native speakers of Laurentian French (LF) participated in Experiment 1, an AX discrimination task, and Experiment 2, a four-interval AX (4IAX) task, which tested the broader relationships of allophony and contrast. It was hypothesized, based on previous experiments (Boomershine et al., 2008; Dupoux et al., 1997; Ettlinger & Johnson, 2009; Johnson & Babel, 2010; Kazanina et al., 2006; Peperkamp et al., 2003; Pruitt et al., 2006), that phones in an allophonic relationship would be more difficult to perceive than phones in a contrastive relationship. Results confirmed previous findings, with longer reaction times for allophonic pairs as compared to contrastive pairs in the AX task (p<.001), as well as in the 4IAX task (p = .004). For Experiments 3, 4 and 5, thirty native speakers of LF participated in an AX, a 4IAX and a similarity rating task. Measures of functional load, frequency and acoustic similarity were applied to pairs of phones in allophonic and phonemic relationships in order to quantify the degree of contrast between pairs. If a gradient view of contrast was supported, it was hypothesized that High Contrast vowels [a-ɔ] would yield higher accuracy, faster reaction times and lower similarity ratings; Low Contrast vowels [y-ʏ] would yield lower accuracy, slower reaction times and higher similarity ratings; and Mid Contrast vowels [o-ʊ] would yield results that fell between the two extremes. If, on the other hand, a strict binary interpretation of contrast was supported, High Contrast vowels and Mid Contrast vowels should yield similar results since these vowels are considered to be in a phonemic relationship, with higher accuracy, faster reaction times and lower similarity ratings, while Low Contrast vowels [y-ʏ], in an allophonic relationship, should yield lower accuracy, slower reaction times and higher similarity ratings. The results from Experiments 3 (AX) and 4 (4IAX) show that the High Contrast pairs yielded significantly higher accuracy scores and faster reaction times than both Mid and Low Contrast pairs (Experiment 3: p<.001 for both High vs. Mid and High vs. Low comparisons; Experiment 4: p = .039 for High vs. Mid, p = .055 for High vs. Low comparisons). However, no significant differences were found between Mid and Low Contrast pairs in these two experiments. The results from Experiment 5 matched gradient predictions, showing significant differences between High, Mid and Low conditions, with similarity being judged highest for Low pairs, lowest for High pairs, and ratings for Mid pairs falling exactly between the other two levels (p<.001 for all comparisons). While results do not perfectly match gradient predictions, the findings provide evidence counter to a strict binary interpretation of contrast since traditionally phonemic pairs (High [a-ɔ] and Mid [o-ʊ]) were significantly different from one another in all experiments. The lack of difference between Mid and Low Contrast pairs could be due to the measures of functional load and frequency for Mid pairs being closer to those of Low pairs, and thus did not reflect a level of contrast that was equidistant between High and Low Contrast. Nevertheless, taken together with the results from Experiment 5, the results appear to support a gradient view of phonological relationships rather than a strictly dichotomous view. Quantitative measures therefore show promise in accounting for cases of intermediate phonological relationships.
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Kolka-Jonsson, Pall Valdimar. « CarbBirch (Kolbjörk) : Carbon sequestration and soil development under mountain birch (Betula pubescens) in rehabilitated areas in southern Iceland ». The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1302113068.

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Creton, Benoît. « Étude par dynamique moléculaire du comportement d'aluminosilicates tubulaires hydratés : structure et dynamique du sytème eau-imogolite ». Lille 1, 2006. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2006/50376-2006-Creton.pdf.

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La structure et la dynamique des molécules d'eau confinées dans des aluminosilicates de formes tubulaire (imogolite) et sphérique (allophane) ont été étudiées à l'échelle microscopique par la méthode de la dynamique moléculaire. Pour ce faire, des modèles structuraux de ces aluminosilicates ainsi que des modèles d'interactions ont été développés. La simulation de la dynamique vibrationnelle de l'imogolite fournit des résultats en accord avec ceux expérimentaux. Ainsi, certaines bandes des spectres infrarouge et Raman ont pu être attribuées. Les spectres Raman calculés pour ces structures montrent une bande située aux basses fréquences dont la position varie en fonction du diamètre du nanotube. Cette bande est attribuée à la vibration de respiration radiale de la structure. Les résultats des simulations sur les systèmes eau/imogolite montrent des caractères hydrophile et hydrophobe respectivement pour les surfaces interne et externe de l'imogolite. Par conséquent, les molécules d'eau proches de ces surfaces ont des comportements différents. Alors que les molécules d'eau entre les nanotubes se comportent de façon similaire aux molécules d'eau dans l'eau liquide, les caractéristiques structurales et dynamiques des molécules à l'intérieur de l'imogolite sont fortement influencées par la surface Bien que la composition chimique de la surface interne de l'imogolite et de l'allophane soit similaire, une plus grande mobilité des molécules d'eau est constatée dans le cas de la structure sphérique traduisant des interactions eau/surface plus faibles que pour le système eau/imogolite
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Maillet, Perrine. « Structure et croissance de nanotubes de Ge-imogolite simple et double-paroi ». Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00584846.

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Les Imogolites (OH)3Al2O3Si(OH) sont des minéraux naturels découverts en 1962 dans des sols volcaniques japonais qui présentent une structure analogue à celle des nanotubes de carbone. Leur synthèse, décrite depuis 1977, permet l'obtention de tubes bien calibrés et monodisperses. La récente mise en évidence de la possibilité de synthétiser des analogues au germanium en grande quantité en a fait un matériau de choix dans le cadre de mon sujet de thèse visant à préparer des matériaux mésoporeux à base de nanoparticules anisotropes. Lors de la caractérisation de ces imogolites par diffusion de rayons X aux petits angles (SAXS) et microscopie électronique en transmission (MET) et à force atomique (AFM), nous avons montré que ces analogues d'Imogolite sont bien des nanotubes, mais qu'ils existent sous deux formes : des tubes à paroi unique mais également des tubes à paroi double jamais observés à ce jour. La concentration importante utilisée pour cette synthèse a également permis de mieux définir l'espèce précurseur de ces nanotubes appelée proto-imogolite et mal connue jusqu'ici. Après une identification du paramètre déterminant la formation de l'une ou l'autre des structures, nous avons étudié en détail le mécanisme et la cinétique de croissance de ces imogolites. Enfin, des premiers tests sur l'organisation de ces nanotubes en forte concentration ou au sein de microgouttes permettent d'observer leur tendance à s'organiser, propriété prometteuse pour le développement futur d'applications.
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Pinheiro, Isadora Massad Giani. « Aspectos fonológicos do português do sul de Goiás ». Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/5829.

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Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
This work presents the description of some phonological aspects in the southern region of Goiás State, in the cities of Orizona, Pires do Rio, Ipameri, Catalão, Três Ranchos, Corumbaíba, Buriti Alegre, Caldas Novas, Mineiros, Rio Verde, Jataí, Itumbiara, Cachoeira Dourada, Quirinópolis, São Simão, Edéia, Paraúna and Vianópolis. The analysis resulted from the answers given in the ALINGO (Linguistic Atlas of Goiás). For pedagogical reasons, these aspects were separated regarding the vowels, the syllables and the consonants. The observations performed about the vowels were related to the phonological possibilities for the phoneme /o/ in pretonic position, which analyzed the different productions of words like “armpit” (sovaco), “ankle” (tornozelo), “sob” (soluço) and “dew” (orvalho). The issue concerning the syllables approaches the nasalization and the oralization of the syllable “-gem” in the end of the words. In this analysis, it was used the realization of “rain drought” (estiagem), “swill” (lavagem) and “pod” (vagem). The chapter about the consonants addressed the oscillation between the employment of /g/ and /k/ in the word “corncob” (sabugo) in the south of Goiás speech. As theoretical fundamentals of the hypothesis worked in each phenomenon, it were used, mainly, the Historical Grammar and the Descriptive Linguistics. To introduce these descriptive chapters presented and explained the concepts of vowel sounds, syllable and consonantal sounds in order to facilitate the comprehension of occurred phenomena. Before the descriptive analysis, in the first chapter, there is a historical background of studies related to the sounds, which presents the development of the main theories in this scope, including the ones used as theoretical basis.
Este trabalho apresenta a descrição de alguns aspectos fonológicos na região sul do estado de Goiás, nas cidade de Orizona, Pires do Rio, Ipameri, Catalão, Três Ranchos, Corumbaíba, Buriti Alegre, Caldas Novas, Mineiros, Rio Verde, Jataí, Itumbiara, Cachoeira Dourada, Quirinópolis, São Simão, Edéia, Paraúna e Vianópolis. As análises partiram de respostas dadas ao questionário do ALINGO – Atlas linguístico de Goiás. Por questões didáticas esses aspectos foram separados quanto às vogais, às sílabas e às consoantes. As observações realizadas sobre as vogais se relacionaram às possibilidades fonológicas para o fonema /o/ em posição pré-tônica, que analisou as diferentes produções das palavras “sovaco”, “tornozelo”, “soluço” e “orvalho”. A questão referente às sílabas aborda a nasalização e a oralização da sílaba “-gem” em final de palavras. Para essa análise foram utilizadas as realizações de “estiagem”, “lavagem” e “vagem” O capítulo a respeito das consoantes tratou da oscilação entre o emprego de /g/ e /k/ na palavra “sabugo” no falar do sul de Goiás. Como fundamentação teórica das hipóteses trabalhadas em cada um dos fenômenos utilizaram-se, principalmente, aspectos da Gramática Histórica e da Linguística descritiva. Para introduzir esses capítulos descritivos, foram apresentados e explanados os conceitos dos sons vocálicos, das sílabas e dos sons consonantais, a fim de facilitar a compreensão dos fenômenos ocorridos. Antes das análises descritivas, no primeiro capítulo, há um percurso histórico dos estudos referentes aos sons, que apresenta o desenvolvimento das principais teorias desse âmbito, inclusive das que foram utilizadas como aporte teórico.
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Livres sur le sujet "Allophagy"

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Choi, John D. Phonetic underspecification and target-interpolation : An acoustic study of Marshallese vowel allophony. Los Angeles, CA : UCLA Dept. of Linguistics, 1992.

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Su, Chunming. Surface charge characteristics and thermodynamic stability of imogolite and allophane. 1992.

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Chapitres de livres sur le sujet "Allophagy"

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Hangay, George, Severiano F. Gayubo, Marjorie A. Hoy, Marta Goula, Allen Sanborn, Wendell L. Morrill, Gerd GÄde et al. « Allophagic Speciation ». Dans Encyclopedia of Entomology, 134. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_160.

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Gordon, Paul G., Ludwig F. Audrieth et P. Lensi. « Allophanyl Hydrazide ». Dans Inorganic Syntheses, 48–51. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132364.ch13.

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Koji, Wada. « Allophane and Imogolite ». Dans SSSA Book Series, 1051–87. Madison, WI, USA : Soil Science Society of America, 2018. http://dx.doi.org/10.2136/sssabookser1.2ed.c21.

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Harsh, James, Jon Chorover et Egide Nizeyimana. « Allophane and Imogolite ». Dans Soil Mineralogy with Environmental Applications, 291–322. Madison, WI, USA : Soil Science Society of America, 2018. http://dx.doi.org/10.2136/sssabookser7.c9.

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Wells, J. C. « Syllabification and Allophony ». Dans Practical English Phonetics and Phonology, 274–83. Fourth edition. | New York, NY : Routledge, [2019] | Series : Routledge English language introductions : Routledge, 2019. http://dx.doi.org/10.4324/9780429490392-27.

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Dahlgren, R. A. « Quantification of Allophane and Imogolite ». Dans Quantitative Methods in Soil Mineralogy, 430–51. Madison, WI, USA : Soil Science Society of America, 2015. http://dx.doi.org/10.2136/1994.quantitativemethods.c14.

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Hiradate, S., et K. Inoue. « Interactions of Mugineic Acid with Allophane, Imogolite, Montmorillonite and Gibbsite ». Dans Effect of Mineral-Organic-Microorganism Interactions on Soil and Freshwater Environments, 89–96. Boston, MA : Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4683-2_9.

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Auer, Michael. « Allophony ». Dans Thresholds, Encounters, 109–26. SUNY Press, 2023. http://dx.doi.org/10.1515/9781438494395-007.

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« allophane clay ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 37. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_11392.

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« opal-allophane ». Dans Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 933. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_150464.

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Actes de conférences sur le sujet "Allophagy"

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Tunega, Daniel, Maria Rechberger, Vivian Remlinger, Katharina Lenhardt, Thilo Rennert, Harald Rennhofer, Max Willinger, Franz Zehetner et Martin Gerzabek. « Glyphosate adsorption on allophane and halloysite ». Dans Goldschmidt2023. France : European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.20148.

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Glocker, Kevin, Aaricia Herygers et Munir Georges. « Allophant : Cross-lingual Phoneme Recognition with Articulatory Attributes ». Dans INTERSPEECH 2023. ISCA : ISCA, 2023. http://dx.doi.org/10.21437/interspeech.2023-772.

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Sang, Hongji, Zhengcheng Gu, Zheng Cui, Ruoxue Zou et Yan Wu. « Preparation and Properties of Ceramic Solidified Product Containing Cs and Sr ». Dans 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-92765.

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Abstract 137Cs and 90Sr in high level liquid waste, with high radioactivity, large heat-generating and relatively long half-life. In order to solve the problem of final disposal of 137Cs and 90Sr, natural mineral allophane was chosen as the base materials to synthesize the silicate ceramic solidified products with cold pressing/sintering method. The microstructure, phase composition and surface element distribution of the solidified products were analyzed. The solidification mechanism of the solidified products was also discussed. The surface of the solidified products appeared melting phenomenon after sintering, and the structure was more compact. CsAlSiO4, Sr2Al2SiO7 and SrAl2Si2O8, which can stably solidify Cs and Sr, were formed in the solidified products. The content of allophane in the solidified product has an important influence on the immobilization ratio of Cs and Sr. And at the sintering condition of 1 h duration time at 1200 °C, the immobilization ratios of Cs and Sr can reach 100 %. By increasing the content of cured substrate, the surface characteristics and crystallization properties of the solidified product can be improved, and the volume reduction effect was more obvious.
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Ha, Kieu Phuong, Martine Grice et Marc Brunelle. « Tonal allophony in Vietnamese : Evidence from task-oriented dialogues ». Dans 7th International Conference on Speech Prosody 2014. ISCA : ISCA, 2014. http://dx.doi.org/10.21437/speechprosody.2014-148.

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Matsuura, Yoko, Fumitoshi Iyoda, Shuhei Hayashi, Shuichi Arakawa, Masami Okamoto et Hidetomo Hayashi. « DNA adsorption characteristics of hollow spherical allophane nano-particles ». Dans PROCEEDINGS OF PPS-29 : The 29th International Conference of the Polymer Processing Society - Conference Papers. American Institute of Physics, 2014. http://dx.doi.org/10.1063/1.4873773.

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Jeute, Thomas J., Leslie L. Baker, Janice L. Bishop, Elizabeth B. Rampe et Zaenal Abidin. « CHARACTERIZING NANOPHASE MATERIALS ON MARS : SPECTROSCOPIC STUDIES OF ALLOPHANE AND IMOGOLITE ». Dans GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-303855.

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Pranoto, Santika Kunti Prabawani et Nurul Fatimah. « Optimation of allophane clay and sugar palm fiber waste as Fe adsorbent ». Dans THE 3RD INTERNATIONAL SEMINAR ON CHEMISTRY : Green Chemistry and its Role for Sustainability. Author(s), 2018. http://dx.doi.org/10.1063/1.5082444.

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Redmon, Charles. « Effects of positional allophony on the acoustic classification of posterior obstruents in Assamese ». Dans 172nd Meeting of the Acoustical Society of America. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000635.

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Dharmawan, Christian Adi, Cari, Pranoto et Prabang Setyono. « Effectiveness of combined activated allophane and effective microorganisms attached bioball to reduce phenol concentration in water ». Dans THE 3RD INTERNATIONAL SEMINAR ON CHEMISTRY : Green Chemistry and its Role for Sustainability. Author(s), 2018. http://dx.doi.org/10.1063/1.5082449.

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