Academic literature on the topic 'H-mat'
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Journal articles on the topic "H-mat"
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De las Peñas, Ma Louise Antonette N., Agnes D. Garciano, and Debbie B. Verzosa. "Weaving Mat(h)s." Mathematical Intelligencer 36, no. 4 (July 16, 2014): 36–46. http://dx.doi.org/10.1007/s00283-014-9462-4.
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Dronet, Marie-Alice. "�tre vu ���chec et mat(h)��." Le Carnet PSY N�224, no. 3 (2019): 40. http://dx.doi.org/10.3917/lcp.224.0040.
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Huang, Zong-Zhi, Zebin Mao, Jiaxin Cai, and Shelly C. Lu. "Changes in methionine adenosyltransferase during liver regeneration in the rat." American Journal of Physiology-Gastrointestinal and Liver Physiology 275, no. 1 (July 1, 1998): G14—G21. http://dx.doi.org/10.1152/ajpgi.1998.275.1.g14.
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Liver-specific and non-liver-specific methionine adenosyltransferase (MAT) are products of two genes (MAT1A and MAT2A, respectively) that catalyze the formation of S-adenosylmethionine (SAM), the principal methyl donor. We previously showed that MAT2A expression was associated with more rapid cell growth. Here we examined changes in hepatic MAT gene expression and related consequences after two-thirds partial hepatectomy (PH) in rats. The mRNA levels of both MAT forms increased from 3 to 6 h, but the MAT1A level then fell below baseline from 12 to 24 h, whereas the MAT2A level remained elevated up to 4 days after PH. The increase in the MAT2A mRNA level was due to increased gene transcription and mRNA stabilization. The change in the MAT1A mRNA level was posttranscriptional and did not require de novo protein synthesis. Changes in MAT activity were consistent with an increased amount of MAT isozymes. SAM levels, the ratio of SAM to S-adenosylhomocysteine (SAH), and DNA methylation fell from 6 to 24 h, whereas SAH levels increased slightly at 12 and 24 h after PH. Both increased SAM utilization and MAT2A gene expression likely contributed to the fall in SAM.
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Silbergeld, Ellen K. "Biological Monitoring of Exposure to Chemicals: Organic Compounds. Mat H. Ho , H. Kenneth Dillon." Quarterly Review of Biology 63, no. 2 (June 1988): 254–55. http://dx.doi.org/10.1086/415924.
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Burger, Magdalena, Sina Berger, Ines Spangenberg, and Christian Blodau. "Summer fluxes of methane and carbon dioxide from a pond and floating mat in a continental Canadian peatland." Biogeosciences 13, no. 12 (June 30, 2016): 3777–91. http://dx.doi.org/10.5194/bg-13-3777-2016.
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Abstract. Ponds smaller than 10 000 m2 likely account for about one-third of the global lake perimeter. The release of methane (CH4) and carbon dioxide (CO2) from these ponds is often high and significant on the landscape scale. We measured CO2 and CH4 fluxes in a temperate peatland in southern Ontario, Canada, in summer 2014 along a transect from the open water of a small pond (847 m2) towards the surrounding floating mat (5993 m2) and in a peatland reference area. We used a high-frequency closed chamber technique and distinguished between diffusive and ebullitive CH4 fluxes. CH4 fluxes and CH4 bubble frequency increased from a median of 0.14 (0.00 to 0.43) mmol m−2 h−1 and 4 events m−2 h−1 on the open water to a median of 0.80 (0.20 to 14.97) mmol m−2 h−1 and 168 events m−2 h−1 on the floating mat. The mat was a summer hot spot of CH4 emissions. Fluxes were 1 order of magnitude higher than at an adjacent peatland site. During daytime the pond was a net source of CO2 equivalents to the atmosphere amounting to 0.13 (−0.02 to 1.06) g CO2 equivalents m−2 h−1, whereas the adjacent peatland site acted as a sink of −0.78 (−1.54 to 0.29) g CO2 equivalents m−2 h−1. The photosynthetic CO2 uptake on the floating mat did not counterbalance the high CH4 emissions, which turned the floating mat into a strong net source of 0.21 (−0.11 to 2.12) g CO2 equivalents m−2 h−1. This study highlights the large small-scale variability of CH4 fluxes and CH4 bubble frequency at the peatland–pond interface and the importance of the often large ecotone areas surrounding small ponds as a source of greenhouse gases to the atmosphere.
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Ni, Henmei, Yadong Yang, Yixuan Chen, Junxiu Liu, Lijuan Zhang, and Min Wu. "Preparation of a poly(DMAEMA-co-HEMA) self-supporting microfiltration membrane with high anionic permselectivity by electrospinning." e-Polymers 17, no. 2 (March 1, 2017): 149–57. http://dx.doi.org/10.1515/epoly-2016-0207.
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AbstractA cross-linked microfibrous anion exchange membrane with high ion permselectivity and robust mechanical properties was fabricated by electrospinning. Copolymer, poly N,N-dimethylaminoethyl methacrylate (DMAEMA)-co-2-hydroxyethyl methacrylate (HEMA), was selected as the electrospun material. Fourier transform infrared (FTIR) spectroscopy, 1HNMR and scanning electron microscopy (SEM) were employed to characterize the copolymer and microfibrous mat. The electrospinning optimal parameters were determined by orthogonal experiments. Formaldehyde vapor was applied to crosslink the mat. It was observed that the water sorption decreased from 75.7% to 30.4% as the crosslinking time increased from 20 h to 32 h. The robust mat with the high tensile strength of 4.62 MPa and 50% elongation at break was obtained at 24 h. The ion permeability of NO3−, Cl−, SO42− were 94, 91 and 87%.
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Ma, Li-Guo, and Yun Geng. "Determination of the reference genes for qRT-PCR normalization and expression levels of MAT genes under various conditions in Ulocladium." PeerJ 8 (November 23, 2020): e10379. http://dx.doi.org/10.7717/peerj.10379.
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The genus Ulocladium is thought to be strictly asexual. One of the possible reasons for the lack of sexuality in Ulocladium species is the absence of the stimulus of environmental factors. Sexual reproduction in ascomycetes is controlled by a specific region in the genome referred to as mating-type locus (MAT) that consists of two dissimilar DNA sequences in the mating partners, termed MAT1-1 and MAT1-2 idiomorphs. To identify the response of MAT loci to environmental conditions, the mRNA transcription level of MAT1-1-1 and MAT1-2-1 genes was tested using qRT-PCR under different temperatures (−20 °C, −10 °C, 0 °C, 10 °C, 20 °C, 30 °C and 40 °C), culture medias (CM, OA, HAY, PCA, PDA and V8), photoperiods (24 h light, 24 h dark, 12 h light/12 h dark, 10 h light/14 h dark and 8 h light/16 h dark), and CO2 concentrations (0.03%, 0.5%, 1%, 5%, 10%, 15% and 20%). For obtaining reliable results from qRT-PCR, the most stable internal control gene and optimal number of reference genes for normalization were determined under different treatments. The results showed that there is no universal internal control gene that is expressed at a constant level under different experimental treatments. In comparison to various incubation conditions, the relative expression levels of both MAT genes were significantly increased when fungal mycelia were grown on HAY culture media at 0–10 °C with a light/dark cycle, indicating that temperature, culture media, and light might be the key environmental factors for regulating the sexuality in Ulocladium. Moreover, MAT1-1-1 and MAT1-2-1 genes showed similar expression patterns under different treatments, suggesting that the two MAT genes might play an equally important role in the sexual evolutionary process.
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Visscher, Pieter T., Rachel F. Gritzer, and Edward R. Leadbetter. "Low-Molecular-Weight Sulfonates, a Major Substrate for Sulfate Reducers in Marine Microbial Mats." Applied and Environmental Microbiology 65, no. 8 (August 1, 1999): 3272–78. http://dx.doi.org/10.1128/aem.65.8.3272-3278.1999.
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ABSTRACT Several low-molecular-weight sulfonates were added to microbial mat slurries to investigate their effects on sulfate reduction. Instantaneous production of sulfide occurred after taurine and cysteate were added to all of the microbial mats tested. The rates of production in the presence of taurine and cysteate were 35 and 24 μM HS− h−1 in a stromatolite mat, 38 and 36 μM HS− h−1 in a salt pond mat, and 27 and 18 μM HS− h−1 in a salt marsh mat, respectively. The traditionally used substrates lactate and acetate stimulated the rate of sulfide production 3 to 10 times more than taurine and cysteate stimulated the rate of sulfide production in all mats, but when ethanol, glycolate, and glutamate were added to stromatolite mat slurries, the resulting increases were similar to the increases observed with taurine and cysteate. Isethionate, sulfosuccinate, and sulfobenzoate were tested only with the stromatolite mat slurry, and these compounds had much smaller effects on sulfide production. Addition of molybdate resulted in a greater inhibitory effect on acetate and lactate utilization than on sulfonate use, suggesting that different metabolic pathways were involved. In all of the mats tested taurine and cysteate were present in the pore water at nanomolar to micromolar concentrations. An enrichment culture from the stromatolite mat was obtained on cysteate in a medium lacking sulfate and incubated anaerobically. The rate of cysteate consumption by this enrichment culture was 1.6 pmol cell−1h−1. Compared to the results of slurry studies, this rate suggests that organisms with properties similar to the properties of this enrichment culture are a major constituent of the sulfidogenic population. In addition, taurine was consumed at some of highest dilutions obtained from most-probable-number enrichment cultures obtained from stromatolite samples. Based on our comparison of the sulfide production rates found in various mats, low-molecular-weight sulfonates are important sources of C and S in these ecosystems.
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Wang, Guo-Bo, Xin Zhou, Xian-Feng Ma, and Jun Wu. "Numerical Study on the Seismic Response of Structure with Consideration of the Behavior of Base Mat Uplift." Shock and Vibration 2017 (2017): 1–19. http://dx.doi.org/10.1155/2017/2030462.
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The foundation might be separated from the supporting soil if the earthquake is big enough, which is known as base mat uplift. This paper proposed a simplified calculation model in which spring element is adopted to simulate the interaction between soil and structure. The load-deformation curve (F-D curve) of the spring element can be designated to represent the base mat uplift, in which the pressure can be applied while tensile forces are not allowed. Key factors, such as seismic wave types, seismic wave excitation directions, seismic wave amplitudes, soil shear velocities, structure stiffness, and the ratio of structure height to width (H/B), were considered in the analysis. It is shown that (1) seismic wave type has significant influence on structure response due to different frequency components it contained; (2) the vertical input of seismic wave greatly affected structure response in vertical direction, while it has little impacts in horizontal direction; (3) base mat uplift is easier to take place in soil with higher shear velocity; (4) structure H/B value has complicated influence on base mat uplift. The outcome of this research is assumed to provide some references for the seismic design of the structure due to base mat uplift.
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Geneve, R. L., S. T. Kester, and J. W. Buxton. "Capillary Mats Alter the Water Content in Medium during Mist Propagation of Dendranthema." HortScience 39, no. 3 (June 2004): 584–87. http://dx.doi.org/10.21273/hortsci.39.3.584.
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A capillary mat-mist system was developed to provide near constant media water contents at differing quantities of mist. Media water contents were reduced by increasing the capillary mat height above a constant water table maintained at bench level. Increased tensions from 0 to 10 cm above the water table reduced water content in Oasis, rockwool, and peat-perlite by 35.4%, 27.6%, and 17.4%, respectively. There was no difference in water content for each medium when the mist quantity ranged between 600 and 1800 mL·m-2·h-1, except when the capillary mat was at 9 cm above the water table and mist volume was 300 mL·m-2·h-1. Chrysanthemum cuttings rooted best when water content was highest regardless of media. Using the peat-perlite medium, water content had the greatest impact on rooting when the mist volume was low (600 mL·m-2·h-1). Relative water content of cuttings was lowest during the first 5 days of sticking and both reduced media water content and mist quantity resulted in the lowest internal water status for the cuttings.
Dissertations / Theses on the topic "H-mat"
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Ebeling, Adierson Gilvani. "Caracter?sticas Estruturais da Mat?ria Org?nica em Organossolos H?plicos." Universidade Federal Rural do Rio de Janeiro, 2010. https://tede.ufrrj.br/jspui/handle/jspui/1838.
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Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico, CNPq, Brasil.
The Histosols have a small geographic extension in the Brazilian territory; however, they are intensively used in family agriculture systems and have a great environmental importance. The drainage of Histosols leads to the subsidence process and other changes in the soil organic matter (SOM), with consequences in their characteristics and potential. The nature of humic substances (HSs) is determinant in the alterations of the Histosols. The characterization of the HSs allows the understanding of processes of SOM transformation in the Histosols, and their environmental impact. The objectives of this study were: to characterize Histosols from different environments and land usage intensity; and to evaluate alterations in humic fractions of SOM, by using elemental composition analyses, spectroscopic, thermal degradation, and nuclear magnetic resonance (NMR) techniques. The study was developed in eight Histosols, from the States of Rio de Janeiro, Maranh?o and Paran?, in Brazil. Their chemical properties: total organic carbon (TOC), pH, sum of bases (SB), H+, Al3+, cation exchange capacity (CEC), and V%; and physical properties: bulk density (BD), MR, MM, and OMD, were evaluated. Also, the quantitative fractionating of the HSs: fulvic acid (C-FAF), humic acid (CHAF), and humin (C-HUM), and C-FAH/C-FAF relations, C-EA/C-HUM (C-EA = C-FAF + C-FAH). The humic acids were extracted using the method of the International Humic Substances Society (IHSS), and evaluated by different techniques. The chemical attributes varied with the intensity of burning and agricultural usage. Though, in general, the Histosols presented low natural fertility, and it was related to the humic acid fraction (high ratio CFAH/ C-FAF). Amongst the SOM fractions the HUM predominated, with an average value of 59.98% of total carbon determined by the CHN; followed by the FAH. The C-FAH/C-FAF ratio diminished with the increase of agriculture usage intensity. The results of the TGI (Thermal Gravimetric Index) suggested strong resistance to thermal degradation of majority of the organic horizons. The elemental composition (%C, %H, %N, %O) of the humic acids showed large amplitude of variation between the horizons, but no pattern was observed between the Histosols. The increase of carbon content, the high values of TGI, and the reduction of oxygen content in the humic acids (HA) might explain the high thermal decomposition resistance found in the HA extracted form the Histosols. A correlation between H/C and TGI was observed, where the lower values of H/C were related to the highest resistance of the humic acids to thermal degradation. The spectroscopic and NMR techniques allowed characterizing compounds and groups of substances in the HA, showing the great potential of these tools in studies of HS from Histosols. The multivariate methods allowed a combined analysis of techniques applied in the study, showing a group of labile and recalcitrance materials in the soils. The results, in general, indicated the fragility of the Histosols areas, in terms of agricultural management and the formation environment. Their importance for the environment should be priority in comparison to agricultural usage, mainly due to their relevant part in the aquifers preservation.
Os Organossolos t?m pequena representatividade geogr?fica no Brasil, entretanto, s?o utilizados intensamente em modelos de agricultura familiar e t?m grande import?ncia ambiental. Por?m, a sua drenagem conduz ao processo de subsid?ncia e outras modifica??es na mat?ria org?nica do solo (MOS), com implica??es nas caracter?sticas dos Organossolos e em sua potencialidade. A natureza das subst?ncias h?micas (SHs) ? determinante nessas altera??es nos Organossolos. A caracteriza??o das SHs permite a compreens?o dos processos de transforma??o da MOS nos Organossolos e seu impacto no ambiente. Os objetivos deste trabalho foram: caracterizar Organossolos em v?rios ambientes e intensidade de uso agr?cola e avaliar altera??es nas fra??es humificadas da MO, atrav?s de t?cnicas de an?lise da composi??o elementar, espectrosc?picas, termodegradativas e de resson?ncia magn?tica nuclear (RMN). Foram estudados oito perfis de solos, nos Estados do Rio de Janeiro, Maranh?o e Paran?. Foram avaliadas as suas propriedades qu?micas: carbono org?nico total (COT), pH, soma de bases (SB), H+, Al3+, CTC e V%; e propriedades f?sicas: densidade do solo (Ds), RM, MM e DMO. Al?m do fracionamento quantitativo das SHs: ?cidos f?lvicos (C-FAF), ?cidos h?micos (C-FAH) e humina (C-HUM), e rela??es C-FAH/C-FAF, C-EA/CHUM (C-EA = C-FAF + C-FAH). Os ?cidos h?micos (AH) foram extra?dos pelo m?todo da Sociedade Internacional de Subst?ncias H?micas (IHSS) e avaliados por distintas t?cnicas. Os atributos qu?micos variaram com o efeito das queimadas e da intensidade de uso agr?cola; por?m, em geral, os Organossolos apresentaram baixa fertilidade natural, a qual, em geral, esteve relacionada ? fra??o ?cido h?mico (maior raz?o C-FAH/C-FAF). Dentre as fra??es da MO, a HUM predominou, com valor m?dio de 59,98% do carbono total determinado pelo CHN, seguida da FAH. A rela??o C-FAH/C-FAF diminuiu a medida que o uso agr?cola ? intensificado. Os dados do ITG (?ndice Termogravim?trico) sugeriram forte resist?ncia ? termodegrada??o para a maioria dos horizontes org?nicos. A composi??o elementar (%C, %H, %N, %O) dos ?cidos h?micos apresentou grande amplitude entre os horizontes, por?m sem padr?o diferenciado entre os Organossolos. O aumento do conte?do de carbono, os altos valores de ITG e a diminui??o do conte?do de oxig?nio nos ?cidos h?micos podem explicar a maior resist?ncia a termodecomposi??o dos AH extra?dos dos Organossolos. Foi observada correla??o entre a raz?o H/C e o ITG, onde os menores valores de H/C estiveram relacionados a maior resist?ncia dos AH ? termodegrada??o. As t?cnicas espectrosc?picas e de RMN permitiram caracterizar compostos e grupamentos nos AH, demonstrando o potencial dessas ferramentas nos estudos de SHs provenientes de Organossolos. Os m?todos de an?lise multivariada permitiram uma avalia??o conjunta das t?cnicas utilizadas, mostrando um grupo de amostras l?beis e recalcitrantes nos solos. Os resultados encontrados, em geral, indicam a fragilidade das ?reas de Organossolos, em fun??o do manejo para agricultura e do seu ambiente de forma??o. A sua import?ncia em termos ambientais deveria ser priorizada em rela??o ao uso agr?cola, principalmente pelo papel relevante na preserva??o de aqu?feros.
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SOUZA, Luiz Gilberto Ambr?sio de. "Caracteriza??o estrutural da mat?ria org?nica do solo, glomalina e subst?ncias h?micas de diferentes ambientes e origens." Universidade Federal Rural do Rio de Janeiro, 2016. https://tede.ufrrj.br/jspui/handle/jspui/1907.
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CNPq
Glomalin is regarded as a hydrophobic, heat-stable and recalcitrant glycoprotein produced by arbuscular mycorrhizal fungi (AMF). Such characteristics possibly result in high amounts of this protein in the soils, as well as a reduced rate of decomposition, and it is considered an important fraction of soil organic matter. Humic Substances (HS) have been recognized for a long time as the organic component most widely distributed on the planet, present both in terrestrial and aquatic environments. They are formed from chemical and biological degradation of residues from plants, animal and microbial activity. Although with some progress on structural aspects of glomalin and humic substances, there are few studies that describe their structural differences using a spectroscopic and chemometric approach. To search for answers for these questions, having as a reference the existing environmental and ecological relationships, this study aimed to confirm the structural relationship (differences and similarities) between the glomalin and humic substances obtained from different sources, through the isolation and purification of soil protein fractions related to glomalin (Glo), and the humic substances (HSs) fractions from different environments and composted materials; characterizing glomalin and humic substances obtained by chemical, physical and spectroscopic techniques (elemental composition, UV-vis, FTIR, 13 C CP-MAS RMN, EMS), and by using chemometric techniques (Unscrambler? X 10.3).
A glomalina ? considerada como uma glicoprote?na hidrof?bica, termoest?vel e recalcitrante produzida pelos Fungos Micorr?zicos Arbusculares (FMA). Tais caracter?sticas possivelmente implicam em altas quantidades desta prote?na nos solos bem como uma reduzida taxa de decomposi??o, sendo considerada como uma importante fra??o da mat?ria org?nica do solo. As Subst?ncias H?micas (SH) t?m sido reconhecidas durante muito tempo como o componente org?nico mais amplamente distribu?do no planeta, presentes tanto em ambientes terrestres quanto aqu?ticos. Elas s?o formadas a partir da degrada??o qu?mica e biol?gica de res?duos de plantas, animais e da atividade microbiana. Embora existam alguns avan?os sobre aspectos estruturais da glomalina e as subst?ncias h?micas, ainda s?o escassos os estudos que descrevem as suas diferen?as estruturais utilizando uma abordagem espectrosc?pica e quimiom?trica. Buscando encontrar respostas a estes questionamentos, assumindo como base de estudo a rela??o ambiental e ecol?gica existente, este estudo tem como objetivo confirmar a rela??o estrutural (diferen?as e semelhan?as) existente entre a glomalina e as substancias h?micas de diferentes origens, atrav?s do isolamento e purifica??o das fra??es da prote?na do solo relacionada ? glomalina (Glo) e as fra??es de subst?ncias h?micas (SHs) de diferentes ambientes e materiais compostados; caracterizando a glomalina e as subst?ncias h?micas obtidas atrav?s de t?cnicas qu?micas, f?sicas e espectrosc?picas (composi??o elementar, UV-vis, FTIR, CP-MAS 13C RMN, MEV) e atrav?s da utiliza??o de t?cnicas quimiom?tricas (Unscrambler? X 10.3).
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Maione, Alberto. "Variational convergences for functionals and differential operators depending on vector fields." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/283145.
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In this Ph.D. thesis we discuss results concerning variational convergences for functionals and differential operators on Lipschitz continuous vector fields. The convergences taken into account are gamma-convergence (for functionals) and H-convergence (for differential operators).
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Barral, Uidemar Morais. "Efeito de fontes e doses de ?cidos h?micos na produ??o do feij?o (Phaseolus vulgaris L.)." UFVJM, 2015. http://acervo.ufvjm.edu.br/jspui/handle/1/805.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes)
A mat?ria org?nica (MOS) do solo consiste de uma mistura de compostos em v?rios est?gios de decomposi??o, resultante da degrada??o biol?gica de res?duos de plantas e animais, e da atividade de microrganismos, denominados subst?ncias h?micas (SHs). Essas subst?ncias fracionadas em ?cidos f?lvicos (AF), ?cidos h?micos (AH) e humina (H), de acordo com sua solubilidade em meio ?cido ou b?sico. Os AH t?m sido usados como fertilizantes aplicados diretamente no solo ou via foliar, principalmente por influenciarem o metabolismo das plantas. Objetivou-se com este trabalho avaliar em feijoeiro (Phaseolus vulgaris L.), a influ?ncia de fontes e doses diferentes de AH, na produ??o, crescimento radicular e absor??o de nutrientes e biodisponibilidade de nutrientes no solo. O experimento foi conduzido utilizando o delineamento em blocos casualizados com 15 tratamentos, sendo estes as fontes de AH (turfa - 1, composto - 2 e produto comercial - 3) e as doses de AH (0, 2, 8, 16 e 32 kg ha-1), com quatro repeti??es. Foram avaliadas: altura das plantas (cm), di?metro do caule (cm), teor de clorofila (?g cm-2) e teor de macro e micronutrientes nas folhas no florescimento do feijoeiro e ao fim do experimento, peso de sementes (g), massa seca da parte a?rea e de ra?zes (g), n?mero de vagem por planta e de sementes por vagem e no solo: pH em ?gua e teores de mat?ria org?nica, P, K, Ca, Mg, Al e H+Al. A aplica??o de AH reduziu o crescimento e produ??o de gr?o, com aumento das doses em cada fonte, seguindo a ordem fonte 3 > fonte 1 > fonte 2. Os teores de P, K, Cu, Fe, Mn e Zn nas folhas foram influenciados pelas doses de todas as fontes de AH. Houve redu??o para maioria dos nutrientes quantificados nas folhas com aumento das doses de AH. Os teores de P e K se elevaram no solo, com a aplica??o de AH. Para condi??es testadas, n?o se recomenda utiliza??o de AH para cultura do feijoeiro.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2015.
ABSTRACT The soil organic matter (SOM) consists of a mixture of compounds in many decomposition stages, the result of biological degradation of residues of plants and animals, and microorganisms activity, called humic substances (HS). These substances are fractionated into fulvic acids (FA), humic acids (HA) and humin (H), according to their solubility in acidic or basic medium. HA have been used as fertilizers directly applied to the soil or via foliar, mainly because they influence plants metabolism. The main goal of this study was evaluating, in bean plant (Phaseolus vulgaris L.), the influence of sources and different doses of HA in production, root growth, nutrients absorption and bioavailability of nutrients in the soil. The experiment was conducted using randomized block design with 15 treatments, which are the sources of HA (peat ? 1, compound ? 2 and commercial product ? 3) and doses of HA (0, 2, 8, 16 e 32 kg ha-1), with four repetitions. Evaluations were made on: plants height (cm), stem diameter (cm), chlorophyll content (?g cm-2) and content of macro and micronutrients in the leaves in the flowering stages and in the end of the experiment, seeds weight (g), dry matter of the aerial part and roots (g), number of pods per plant and seeds per pod, and in the soil: pH in water and contents of organic matter, P, K, Ca, Mg, Al and H+Al. Application of HA reduced bean growth and production, with increase of doses in each source, following order: source 3 > source 1 > source 2. Contents of P, K, Cu, Fe, Mn and Zn in the leaves were influenced by the doses of all HA sources. Most of the nutrients quantified in the leaves were reduced with increasing HA doses. Contents of P and K were increased in the soil with application of HA. For tested conditions, the use of HA for bean culture is not recommended.
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Fontana, Ademir. "Fracionamento da mat?ria org?nica e caracteriza??o dos ?cidos h?micos e sua utiliza??o no Sistema Brasileiro de Classifica??o de Solos." Universidade Federal Rural do Rio de Janeiro, 2009. https://tede.ufrrj.br/jspui/handle/tede/317.
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Previous issue date: 2009-04-03Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
The importance of soil organic matter in pedology and especially soil classification studies can be substantiated by the use of attributes such as organic carbon content, degree of organic matter decomposition from the fibers content. Recent studies in Brazil with humic substances report establishment of standards that could be used to differentiate soil horizons (diagnostic attributes), soil horizon classification and the relationship with properties that connote soil fertility. This study had as objectives: to characterize humic substances and humic acids of different diagnostic soil horizons of Brazilian soils; b) to propose the utilization of attributes related to humic substances in the characterization of the lower hierarchical levels (family and series) of the Brazilian System of Soil Classification (SiBCS). The soil material utilized material from 169 diagnostic horizons or epipedons, identified as: 13 O histic, 30 H histic, 42 A mollic, 39 A umbric, and 45 B spodic horizons. In these horizons there were evaluated the chemical properties: TOC, pH, H+, SB (sum of bases), CEC and V% (base saturation); physical properties: sand, silt and clay contents; quantitative fractionating of humic substances: fulvic acid fraction (C-FAF), humic acid fraction (C-HAF) and humin (C-HUM), C-HAF/C-FAF, C-AE/C-HUM, and C-AE/COT ratio (C-AE = C-FAF + C-HAF), and the %FAF, %HAF, %HUM and %AE. In the purified humic acid (HA) spectroscopic analyses were performed on visible and infrared regions, elemental composition and termogravimetric analyses; in addition to that the alkaline extract (AE) was analyzed by spectroscopy on visible region. The quantitative fractionating of humic substances showed differential distribution between the types of diagnostic soils horizons, highlighting the O and H histic horizons, where the predominance of humin showed average around 53% and 39%, respectively, and followed by humic acids. Also, for the H histic horizon there were high values of the C-HAF/C-FAF ratio (average of 5.6). On the mollic epipedon it was observed predominance of humin with average around 71%, and low values of C-AE/C-HUM ratio (average of 0.2), and on the umbric epipedon humin predominance averaging 47%, followed by humic acids. On the spodic horizon there was predominance of fulvic and humic acids with average around 30% and 44%, respectively. On this horizon, the values of the C-HAF/C-FAF ratio were high, with average around 9.9 (most of them higher than 1.0), and the C-AE/C-HUM ratio averaged 16.5 (majority higher than 2.0). The evaluation of variables related to visible and infrared spectroscopic, elemental composition and termogravimetric of HA, and visible region for AE, showed similar characteristics and absence of a pattern independent ly of soils genesis. According to the distribution of humic substances the following differential characteristics were proposed to the SiBCS: Stable Organic Matter (surface mineral horizons) C-AE/C-HUM = 0.5, Iluvial Organic Matter (subsurface mineral horizons) - C-AE/C-HUM = 2.0, and Leaching Potential (system or soil) - C-HAF/C-FAF and C-AE/C-HUM = 1.0. Also, the establishment of classes according to humic substances was efficient to identify distinct groups based on their chemical properties. This result validates the proposal of using these variables to classify these horizons on the family and series levels, and contribute to structure the SiBCS in the lower hierarchical levels (5th and 6th).
A import?ncia da mat?ria org?nica do solo nos estudos de pedologia e em especial na classifica??o de solos pode ser constatada pela utiliza??o de atributos como os teores de carbono org?nico e grau de decomposi??o da mat?ria org?nica a partir do teor de fibras. Alguns trabalhos desenvolvidos recentemente no Brasil com subst?ncias h?micas em solos buscaram estabelecer padr?es que poderiam ser utilizados na separa??o de horizontes (atributo diagn?stico), classifica??o dos horizontes ou mesmo rela??es com propriedades ed?ficas que conotam fertilidade dos solos. Este trabalho teve como objetivos: caracterizar diferentes horizontes diagn?sticos de solos por meio das subst?ncias h?micas e dos ?cidos h?micos; e propor o uso de atributos relacionados ?s subst?ncias h?micas na categoriza??o dos n?veis hier?rquicos inferiores (fam?lia e s?rie) do SiBCS. Foram utilizados materiais de solo de 169 horizontes diagn?sticos, sendo: 13 O h?stico, 30 H h?stico, 42 chernoz?mico, 39 A h?mico, 45 B esp?dico. Foram avaliadas as propriedades qu?micas: COT, pH, SB, H+, Al3+, CTC e V%; propriedades f?sicas: areia, silte e argila; fracionamento quantitativo das subst?ncias h?micas: fra??o ?cidos f?lvicos (C-FAF), fra??o ?cidos h?micos (C-FAH) e fra??o humina (C-HUM), rela??es C-FAH/C-FAF, C-EA/C-HUM e C-EA/COT (C-EA = C-FAF + C-FAH) e a %FAF, %FAH, %HUM, % EA. Em ?cidos h?micos (AH) purificados foram realizadas an?lises espectrosc?picas na regi?o do vis?vel e infravermelho, composi??o elementar e termogravim?trica; al?m de, no extrato alcalino (EA) an?lise espectrosc?pica na regi?o do vis?vel. O fracionamento quantitativo das subst?ncias h?micas apresentou distribui??es diferenciadas entre os tipos de horizontes diagn?sticos de solos, destacando-se no O h?stico e H h?stico o predom?nio da humina com m?dia de 53% e 39%, respectivamente, seguido dos ?cidos h?micos e ainda para o ?ltimo, altos valores da rela??o C-FAH/C-FAF (m?dia de 5,6). No A chernoz?mico observou-se o predom?nio absoluto da humina com m?dia de 71% e baixos valores da rela??o C-EA/C-HUM (m?dia de 0,2) enquanto no A h?mico houve predom?nio da humina (m?dia de 47%), seguida dos ?cidos h?micos. No B esp?dico o predom?nio dos ?cidos f?lvicos e h?micos com m?dia de 30% e 44%, respectivamente, e altos valores da rela??o C-FAH/C-FAF com m?dia de 9,9 (maioria superiores 1,0) e C-EA/C-HUM com m?dia de 16,5 (maioria superiores 2,0). Pela avalia??o das vari?veis relacionadas ? espectroscopia do vis?vel e infravermelho, composi??o elementar e termogravimetria dos AH, e na regi?o do vis?vel para o EA, observou-se caracter?sticas semelhantes e aus?ncia de padr?o diferencial independente da g?nese dos solos. Com base na distribui??o das subst?ncias h?micas foram feitas as seguintes propostas de caracter?sticas diferenciais no SiBCS: Mat?ria Org?nica Est?vel (horizontes minerais superficiais) - C-EA/C-HUM = 0,5, Mat?ria Org?nica Iluvial (horizontes minerais subsuperficiais) - C-EA/C-HUM = 2,0 e, Potencial de Lixivia??o (sistema ou solo) - C-FAH/C-FAF e C-EA/C-HUM = 1,0. O estabelecimento de classes com os valores das subst?ncias h?micas tamb?m foi eficiente para individualizar grupos pela compara??o das propriedades qu?micas, o que valida a proposta de utiliza??o dessas vari?veis para a classifica??o desses horizontes nos n?veis de fam?lia ou s?rie e podem contribuir para a estrutura??o do SiBCS nos n?veis hier?rquicos inferiores (5? e 6?).
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Freire, Rafaela Dias de Arag?o. "Efeito de subst?ncias h?micas extra?das da mat?ria org?nica de turfeiras e de composto org?nico de res?duos da ind?stria t?xtil na reten??o de ?gua." UFVJM, 2013. http://acervo.ufvjm.edu.br:8080/jspui/handle/1/490.
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A mat?ria org?nica do solo (MOS) relaciona-se intimamente com a capacidade de reten??o de ?gua pelo solo. As turfeiras e os compostos org?nicos s?o materiais ricos em MOS. O objetivo do trabalho foi quantificar a capacidade de reten??o de ?gua da humina (H) e dos ?cidos h?micos (AH) da mat?ria org?nica (MO) de turfeiras e de composto org?nico proveniente de res?duos da ind?stria t?xtil, puros e em mistura com areia. O fracionamento dos materiais seguiu uma adapta??o da metodologia da Internacional Humic Substances Society. Obtiveram-se os substratos advindos das seguintes propor??es de subst?ncias h?micas (SH), provenientes de turfeira e de composto, e areia (fina e m?dia): 0 % SH e 100 % de areia fina (AF) e m?dia (AM); 100 % SH e 0 % de areia AF ou AM; 75 % SH e 25 % AF ou AM; 50 % SH e 50 % AF ou AM; 25 % SH e 75 % AF ou AM. Com o aux?lio do extrator de Richards foram determinados os teores de ?gua retida nas tens?es de 0 (CMRA), 10, 100, 300, 500, 700 kPa, para todos os substratos. Foi feita a an?lise de vari?ncia. N?o se observou diferen?as estat?sticas entre substratos com 100 % de AF e AM. Analisando-se as diferen?as de reten??o de ?gua dos substratos com 100% de AH e da H, e as diferen?as de origem (composto e turfeira), encontrou-se as maiores reten??es para os substratos com AH e para os substratos com SH provenientes de turfeira. A humina ? a SH que predomina amplamente no composto de res?duos de industria t?xtil e de turfeira. A maior reten??o de ?gua, na CMRA e nas tens?es 10, 100, 300, 500 e 700 kPa, foi obtida pelo substrato com 100% de AH em rela??o aos substratos com 100% de H. Os substratos com diferentes propor??es de AH e areia apresentaram reten??o de ?gua semelhante aos substratos com diferentes propor??es de H e areia. O substrato que obteve as maiores reten??es de ?gua foi 75 % de SH e 25 % de AF. Os AH e a H apresentam hidrofilia e tem potencial para a fabrica??o do hidrorretentor org?nico sustent?vel. Pela modelagem de reten??o de ?gua, a perda de ?gua pelos substratos ? base de H ? bem mais evidente na CMRA. Para os substratos ? base de AH a perda de ?gua com o aumento da press?o aplicada se torna mais evidente nas propor??es de 75 % de SH e principalmente, na CMRA.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Ci?ncia Florestal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013.
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Campos, Jos? Ricardo da Rocha. "Caracteriza??o, mapeamento, volume de ?gua e estoque de carbono da turfeira da ?rea de prote??o ambiental Pau-de-Fruta em Diamantina ? MG." reponame:Repositório Institucional da UFVJM, 2009. http://acervo.ufvjm.edu.br:8080/jspui/handle/1/551.
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A turfeira ? formada pelo ac?mulo em sucess?o de restos vegetais, em locais que apresentam condi??es que inibem a atividade de microrganismos decompositores, como excesso de umidade, baixo pH, escassez de oxig?nio e temperaturas amenas. Em Diamantina, esse pedoambiente ? encontrado na ?rea de Prote??o Ambiental - APA Pau-de-Fruta, situada a 6 km da sede do munic?pio, a uma altitude m?dia de 1366 m. A APA est? inserida na Serra do Espinha?o Meridional, sua litologia ? predominantemente quartz?tica e a vegeta??o ? t?pica de campo rupestre, com pequenas ilhas de cerrado denominadas cap?es, que se adaptaram ao ambiente hidrom?rfico. O ambiente ? oligotr?fico e apresenta elevados teores de Al3+ e valores de satura??o por alum?nio. As turfeiras formadas nessa ?rea apresentam verticalmente uma estrutura bem definida, sendo que as camadas mais superficiais foram classificadas, de acordo com seu est?gio de decomposi??o, como f?bricas, as intermedi?rias como h?micas e as camadas mais profundas, como s?pricas. A turfeira, por ser um ambiente de ac?mulo de mat?ria org?nica em condi??es de baixa atividade de O2, favorece a forma??o e a manuten??o de subst?ncias h?micas, sobretudo as fra??es menos sol?veis, de forma que o teor de humina ? maior que os teores de ?cidos h?micos que, por sua vez, s?o maiores que o teor de ?cidos f?lvicos. A turfeira, devido ao seu comportamento tipo esponja, apresenta grande import?ncia na din?mica da ?gua nessa regi?o, de forma que, nos per?odos chuvosos, ela armazena ?gua em seus poros e a libera de forma gradativa com o passar do tempo. A turfeira da APA Pau-de-Fruta ocupa 81,75 ha, armazena cerca de 629.782 m3 de ?gua e estoca em torno de 33.129 toneladas de carbono. Dessa forma, a turfeira da APA Pau-de-Fruta representa um consider?vel reservat?rio natural de ?gua, bem como o importante ambiente de sequestro de carbono e ? fundamental para o abastecimento de ?gua da cidade de Diamantina.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2009.
ABSTRACT The Peat Bog is formed by the accumulation in succession of crop residues in places with conditions that inhibit the activity of microbial decomposers, such as excessive moisture, low pH, lack of oxygen and mild temperatures. In Diamantina, this is found in the Environmental Protection Area - EPA Pau-de-Fruta, situated 6 km from the headquarters of the city, at an average altitude of 1,366 m. The EPA is inserted in the Serra do Espinha?o Meridional, its lithology is predominantly quartz and its vegetation is typical of rocky field, with small islands of ?cerrado? (vegetation of the Brazilian interior) called ?cap?es?, which are adapted to the hydromorphic environment. The environment is oligotrophic and offers high levels of Al3+ and the values of saturation by aluminum. The bogs formed in this area have a vertically well-defined structure and, according to their stage of decomposition, the more superficial layers were classified as ?f?bricas?, the intermediate layers as ?h?micas?, and the deeper layers as ?s?pricas?. The bog, being an environment of accumulation of organic material under conditions of low activity of O2, promotes the formation and maintenance of wet substances, especially the less soluble fractions, so that the content of humin is greater than the levels of humic acids which in turn are greater than the content of fulvic acids. The bog, because of its behavior type sponge, has great importance in the dynamics of water in this region, so that in rainy periods it stores water in its pores and releases it gradually over the time. The bog of the EAP Pau-de-Fruta occupies 81.75 ha, stores about 629,782 m3 of water and stocks around 33,129 tonnes of carbon. Thus, the bog of of the EAP Pau-de-Fruta is a considerable natural reservoir of water, and an important environment of carbon sequestration and it is essential for the supply of water for the city of Diamantina.
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Harris, Scott H. ""The Great Unappreciated Man": A Political Profile of Alexander H H Stuart of Virginia." W&M ScholarWorks, 1988. https://scholarworks.wm.edu/etd/1539625475.
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Rocha, Anne Kelly Freire da. "Caracteriza??o espacial de reservat?rios do semi?rido em fun??o da qualidade da ?gua atrav?s do uso de componentes principais." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16010.
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Previous issue date: 2014-03-11A regi?o semi?rida sofre escassez h?drica. A fim de regularizar a disponibilidade h?drica nos per?odos de estiagem, s?o constru?das barragens. No entanto, a qualidade da ?gua armazenada tem sofrido os efeitos do descarte irregular de res?duos no meio ambiente e das atividades antr?picas exercidas nas bacias hidrogr?ficas. A degrada??o h?drica pode ser constatada a partir do monitoramento dos par?metros de qualidade da ?gua. Estes dados podem ser analisados atrav?s de m?todos estat?sticos tais como a An?lise de Componentes Principais e a an?lise de agrupamento, que seleciona indiv?duos com caracter?sticas semelhantes. O objetivo deste trabalho ? realizar oagrupamento dos reservat?rios do Rio Grande do Norte, com base nos par?metros de qualidade da ?gua, para a identifica??o de grupos homog?neos de reservat?rios em termos de fontes de polui??o. Ser?o objeto desse estudo as bacias Piranhas-A?u, Apodi-Mossor?, Trair?, Potengi e Cear?-Mirim. Os par?metros merc?rio, chumbo, cromo, f?sforo total, nitrog?nio total e zinco contribu?ram para a forma??o da primeira componente principal, que pode indicar polui??o por metais pesados; s?lidos totais, DBO, OD e cobre, para a segunda componente, que pode ser indicativo de polui??o por mat?ria org?nica e atividades antr?picas; e clorofila a , c?dmio e n?quel, para a terceira componente, que pode indicar eutrofiza??o e polui??o por metais pesados. De posse das componentes principais se procedeu o agrupamento dos reservat?rios, formando-se quatro grupos distintos. Os grupos 1 e 2 s?o constitu?dos por reservat?rios da Bacia Piranhas-A?u, que apresentou maiores valores de metais pesados. O grupo 3, constitu?do por reservat?rios das bacias Cear?-Mirim, Potengi e Trair?, apresentou maiores valores de DBO e s?lidostotais e o grupo 4 ? formado por reservat?rios da Bacia Apodi-Mossor?. Nas Bacias do Trar? e Piranhas-A?u deve ser coibido o lan?amento desordenado de efluentes e fontes de polui??o difusas, e implantado um sistema de coleta de esgoto para minimizar a polui??o por mat?ria org?nica
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Iwano, Masahiro. "Characteristics of gastric MALT lymphoma resistant to eradication of H. pylori." Kyoto University, 2008. http://hdl.handle.net/2433/124330.
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Maurice, Galway, ed. Gach uige mar a h-ábhar. (Baile Ui Thaidhg): Oidhreacht, Cumann Taighde agus Forbartha, 1994.
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Falkof, Lucille. John H. Johnson, "the man from Ebony". Ada, Okla: Garrett Educational Corp., 1992.
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Burke, Joseph C. William H. Miner: The man and the myth. Minneapolis, MN: Langdon Street Press, 2009.
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William H. Miner: The man and the myth. Minneapolis, MN: Langdon Street Press, 2009.
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Wyckoff, Edwin Brit. Sign language man: Thomas H. Gallaudet and his incredible work. Berkeley Heights, NJ: Enslow Elementary, 2010.
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This man & others: The personal memoirs of Samuel H. Zorian. London: Mihran & Azniv Essefian Charitable Trust, 1996.
Find full textBook chapters on the topic "H-mat"
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Paniagua-Zambrana, Narel Y., and Rainer W. Bussmann. "Dictyocaryum lamarckianum (Mart.) H. Wendl." In Ethnobotany of Mountain Regions, 1–17. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-77093-2_99-1.
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Luo, Juan, Junli Zha, Yi Xiao, and Renfa Li. "H-Mac: A Hybrid MAC Protocol for VANET." In Communications in Computer and Information Science, 346–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36252-1_32.
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Paniagua-Zambrana, Narel Y., and Rainer W. Bussmann. "Dictyocaryum lamarckianum (Mart.) H. Wendl. Arecaceae." In Ethnobotany of Mountain Regions, 715–32. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28933-1_99.
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Lindner, Oliver. "Wells, H. G.: The Invisible Man." In Kindlers Literatur Lexikon (KLL), 1–2. Stuttgart: J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_17340-1.
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Barcelo, Racquel C., and Jonathan M. Barcelo. "Calamus manillensis (Mart.) H. Wendl. Arecaceae." In Ethnobotany of Mountain Regions, 1–5. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-14116-5_7-1.
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Barcelo, Racquel C., and Jonathan M. Barcelo. "Calamus manillensis (Mart.) H. Wendl. Arecaceae." In Ethnobotany of Mountain Regions, 219–23. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-38389-3_7.
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Kiberd, Declan. "D. H. Lawrence: The New Man as Prophet." In Men and Feminism in Modern Literature, 136–67. London: Palgrave Macmillan UK, 1985. http://dx.doi.org/10.1007/978-1-349-17940-4_6.
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Fleischmann, Ewan, Christian Forler, and Stefan Lucks. "${\Gamma\mbox{-MAC}\lbrack H,P\rbrack}$ - A New Universal MAC Scheme." In Research in Cryptology, 83–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34159-5_6.
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Jotterand, Fabrice. "H. Tristram Engelhardt, Jr.: The Man Behind the Scholar." In At the Foundations of Bioethics and Biopolitics: Critical Essays on the Thought of H. Tristram Engelhardt, Jr., 263–64. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18965-9_21.
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Borden, Weston Thatcher. "H. C. Longuet-Higgins: The Man and His Science." In ACS Symposium Series, 155–95. Washington, DC: American Chemical Society, 2013. http://dx.doi.org/10.1021/bk-2013-1122.ch006.
Full textConference papers on the topic "H-mat"
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Wadhwa, Hemlata, Balaji Krishnamoorthy, and Krish P. Thiagarajan. "Variation of Heave Added Mass and Damping Near Seabed." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20456.
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During installation of subsea structures such as mud mats, the tension in crane wires can experience spikes when the structure is near the seabed. It is hypothesized that such spikes may be caused by the structure undergoing resonant oscillations, which in turn may be due to changes in added mass and damping near the seabed. Such motions can cause hardship for operators as they interfere with precise positioning during installation. With increasing exploration and production in deep and remote fields, the size and weight of subsea equipments are continuously increasing. Installation operations such as lifting and lowering, positioning of the object require good knowledge of the hydrodynamic coefficients. Following on ideas used in Norwegian offshore, the mud mat is modeled as a circular disk. Experiments are conducted on an oscillating solid disk of diameter and thickness 200 mm and 2 mm respectively. The heave oscillations are forced by a programmable actuator, at amplitudes varying from 1–56 mm and frequencies from 1.0–1.8 Hz. The elevation ‘h’ of the disk from the mean seabed is varied from 0.2–2 times the disk radius. The forces on the disk are measured using a submersible high-sensitivity load cell. The motions of the disk are restricted to axial (heave) direction, and are measured with a displacement transducer. The measured forces and displacement are analyzed using a Fourier Transform algorithm to separate the added mass and damping effects. The authors have found similar trends in the hydrodynamic behavior of a disk approaching the seabed to what was found when the disk approached the free surface in Wadhwa & Thiagarajan [1]. The added mass and damping coefficients were found to increase with increasing KC, as well as with increasing proximity to the seabed. Another noticeable feature of the experiments was the cavity formation underneath the oscillating structure. The width of the cavity was about 3–4 times the radius of the disk and depth was about one third/fourth of the radius of the disk. The size of the cavity and the increase in hydrodynamic forces near the seabed suggest the importance of knowledge of hydrodynamic behavior near the seabed.
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Barreiro, Jose A., John S. Knowles, Carl R. Johnson, Iain D. Gordon, and Lene K. Gjerde. "Successful Application of a Reinforced Composite Mat Pill Technology for Lost Circulation Control in the Norwegian Continental Shelf." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204062-ms.
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Abstract An operator in the Norwegian continental shelf (NCS) required sufficient zonal isolation around a casing shoe to accommodate subsequent targeted injection operations. Located in the Ivar Aasen field, and classified as critical, the well had a 9 ⅝-in. casing shoe set in the depleted Skagerrak 2 reservoir. The lost circulation risk was high during cementing because the Hugin formation, located above the reservoir, contained 40 m [~ 131.2 ft] of highly porous and permeable sandstone. During previous operations in the field, lost circulation was observed before and during the casing running and cementing operations. After unsuccessful attempts to cure the losses with various lost circulation materials, a new solution was proposed to target the specific lost circulation problem by combining two types of reinforced composite mat pill (RCMP) technology. Specifically, the first type of RCMP technology was engineered for use in the viscous preflush spacer, and the second was applied to the cement slurry itself. Working in synergy, the RCMP systems mitigated the risk of incomplete zonal isolation. With no losses observed upon reaching total depth (TD) for the 12 ¼-in. hole, the 9 ⅝-in. casing was run with a reamer shoe and 15 rigid centralizers. Between 2700 and 2728 m [~ 8,858 and 8,950 ft] measured depth (MD), the rig observed constant drag of 30 to 40 MT whilst working the casing down, and circulation was completely lost before partial returns were eventually observed. The rig continued to work the string down to the planned landing depth at 3897 m [~ 12,785 ft] MD. Precementing circulation ensued with staged pump rates increasing at 100-L/min [~ 0.6-bbl/min] intervals up to 1400 L/min [~ 8.8 bbl/min], which induced losses at a rate of 6.5 m3/hour [~ 40 bbl/hour]). Subsequently, the flow rate was reduced to 1300 L/min [~ 8.1 bbl/min], and the annular volume was circulated 2.6 times with full returns. Attempts to reduce equivalent circulating density (ECD) ahead of the cementing operation were implemented at 1300 L/min [~ 8.1 bbl/min] using a low-density, low-rheology oil-based drilling fluid pill. However, a significant loss rate of 18.0 m3/hour [~113 bbl/hour] was observed. The flow rate was reduced to 950 L/min [~ 6.0 bbl/min], and partial circulation was recovered. After the spacer and cement had reached the annulus, full returns were immediately observed and continued until the top plug was successfully bumped. Acoustic logging determined that the operation had achieved the primary job objective of establishing the required length of hydraulically isolating cement in the annulus. Lost circulation is a costly problem that can be difficult to solve, even with the wide variety of technologies available (Vidick, B., Yearwood, J. A., and Perthuis, H. 1988. How To Solve Lost Circulation Problems. SPE-17811-MS). This case study demonstrates a successful solution. The operator will be able to incorporate lessons learned and best practices into future operations, and these lessons and practices will be useful to other operators with similar circumstances.
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Berizzi, F., M. Martorella, A. Capria, R. Paladini, and D. Calugi. "H/α polarimetric features for man-made target classification." In 2008 IEEE Radar Conference (RADAR). IEEE, 2008. http://dx.doi.org/10.1109/radar.2008.4721003.
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Muhammad, Faraz Khan, Zahid Mohammed Karajagi, Surya Pallapothu, Hafez Mohamed, Pierre Klem, and Umar Arshad. "Engineered Reinforced Composite Mat Pills to Effectively Combat Losses While Drilling in Qatar." In IADC/SPE Asia Pacific Drilling Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/201030-ms.
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Abstract Drilling into fractures and fissures in carbonate reservoirs with lateral pore pressure variations is a major challenge. Accurately predicting and managing fracture initiation and fracture closure pressure is not practically feasible in naturally fractured carbonate rocks. Local fracture closure pressure (FCP, minimum in situ stress) around fractures are much lower than the mean value of FCP for the area, as observed in the Al Shaheen field. Drilling operators are experiencing massive lost circulation resulting in potential formation damage; and cost overruns. To address these lost circulation instances, modern lost circulation pills must be implemented. Drilling through the natural fractures within parts of the Shuaiba limestone reservoir usually results in significant drilling fluid losses, up to 50 m3/h. Lateral pore pressure variation causes dynamic inflow conditions within the wellbore, which make plugging fractures difficult. In addressing these lost circulation challenges, various approaches were previously used, notably reducing the hydrostatic pressure of fluids column, utilizing lighter weight drilling fluids, reducing the penetration of fluids into fractures with the use of various lost circulation materials, and the use of thixotropic cement slurries and lightweight high-solids-content cement slurries. Conventional lost circulation treatments provided very limited success under these conditions. An engineered composite fiber-based lost circulation pill with an innovative blend of fibers and sized solids to bridge and plug thief zones has been developed to address these lost circulation challenges. This pill was designed to be pumped through either a dummy bottomhole assembly (BHA) or through bypass circulation ports above the BHA with total flow area of 1.571 in2. These pills have been successfully used to mitigate losses while drilling as well as to achieve an incremental equivalent static density up to 144 kg/m3 to drill and cement the section. An impermeable grid created by this system was able to withstand the additional pressures. As a result, all the wells treated with these pills in the field were successfully drilled and cemented. After establishing the field specific guidelines over 2 years, continuous success was replicated in other wells for all the operator's rigs in Qatar.
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Rastgoftar, Hossein, and Suhada Jayasuriya. "Preserving Stability Under Communication Delays in Multi Agent Systems." In ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-3812.
Full textAbstract:
The effect of time delays on the stability of a recently proposed continuum approach for controlling a multi agent system (MAS) evolving in n-D under a special local inter-agent communication protocol is considered. There a homogenous map determined by n+1 leaders is learned by the follower agents each communicating with n+1 adjacent agents. In this work both position and velocity information of adjacent agents are used for local control of follower agents whereas in previous work [1, 2] only position information of adjacent agents was used. Stability of the proposed method under a time delay h is studied using the cluster treatment of characteristic roots (CTCR) [3]. It is shown that the stability of MAS evolution can be preserved when (i) the velocity of any follower agent is updated using both position and velocity of its adjacent agents at time (t-h); and (ii) the communication matrix has real eigenvalues. In addition, it is shown that when there is no communication delay, deviations from a selected homogenous map during transients may be minimized by updating only the position of a follower using both position and velocity of its adjacent agents.
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Kalaivaani, P. T., and A. Rajeswari. "An analysis of H-MAC, HSMAC and H-MAC based AOMDV for wireless sensor networks to achieve energy efficiency using spatial correlation concept." In 2015 2nd International Conference on Electronics and Communication Systems (ICECS). IEEE, 2015. http://dx.doi.org/10.1109/ecs.2015.7125021.
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Teng, Hao, Baohua Zhao, and Aizeng Cao. "Chaos Quantum Genetic Algorithm Based on Hénon Map." In 2010 International Conference on Intelligent Computation Technology and Automation (ICICTA). IEEE, 2010. http://dx.doi.org/10.1109/icicta.2010.810.
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French, Rowland, Thomas Pennington, Roy Cook, and Tammy Cleys. "Borehole GPR to Detect and Map Deviated H‐Pile Foundations." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2012. Environment and Engineering Geophysical Society, 2012. http://dx.doi.org/10.4133/1.4721780.
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Kauffman, Kyle, and John Raquet. "Navigation via H-field signature map correlation and INS integration." In 2014 IEEE Radar Conference (RadarCon). IEEE, 2014. http://dx.doi.org/10.1109/radar.2014.6875817.
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Yan, Chen, Cui Wu, and Fengjuan Chen. "Rank One Chaos in Periodically-Kicked Hénon Map." In 2011 Fourth International Workshop on Chaos-Fractals Theories and Applications (IWCFTA). IEEE, 2011. http://dx.doi.org/10.1109/iwcfta.2011.94.
Full textReports on the topic "H-mat"
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Aeromagnetic total field map, 64D/4g,h, Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120517.
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Aeromagnetic total field map, 74A/1g,h, Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120523.
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Aeromagnetic total field map, 64C/12g,h, Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120530.
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Aeromagnetic total field map, 64B/6g,h, Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120536.
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Aeromagnetic total field map, 64B/5g,h, Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120550.
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Aeromagnetic vertical gradient map, Saskatchewan [64D/4g,h]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120557.
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Aeromagnetic vertical gradient map, Saskatchewan [74A/1g,h]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120562.
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Aeromagnetic vertical gradient map, Manitoba [64B/6g,h]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120574.
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Aeromagnetic vertical gradient map, Manitoba [64B/5g,h]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120579.
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Aeromagnetic vertical gradient map, Manitoba [64C/12g,h]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120581.
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