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Добірка наукової літератури з теми "CH3I"

Автор: Grafiati
Опубліковано: 25 травня 2024

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Статті в журналах з теми "CH3I"

1

Ji, Xiaoyan, and Jing Xie. "Proton transfer-induced competing product channels of microsolvated Y−(H2O)n + CH3I (Y = F, Cl, Br, I) reactions." Physical Chemistry Chemical Physics 24, no. 12 (2022): 7539–50. http://dx.doi.org/10.1039/d1cp04873b.

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2

Tegtmeier, S., K. Krüger, B. Quack, E. Atlas, D. R. Blake, H. Boenisch, A. Engel, et al. "The contribution of oceanic methyl iodide to stratospheric iodine." Atmospheric Chemistry and Physics 13, no. 23 (December 9, 2013): 11869–86. http://dx.doi.org/10.5194/acp-13-11869-2013.

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Abstract. We investigate the contribution of oceanic methyl iodide (CH3I) to the stratospheric iodine budget. Based on CH3I measurements from three tropical ship campaigns and the Lagrangian transport model FLEXPART, we provide a detailed analysis of CH3I transport from the ocean surface to the cold point in the upper tropical tropopause layer (TTL). While average oceanic emissions differ by less than 50% from campaign to campaign, the measurements show much stronger variations within each campaign. A positive correlation between the oceanic CH3I emissions and the efficiency of CH3I troposphere–stratosphere transport has been identified for some cruise sections. The mechanism of strong horizontal surface winds triggering large emissions on the one hand and being associated with tropical convective systems, such as developing typhoons, on the other hand, could explain the identified correlations. As a result of the simultaneous occurrence of large CH3I emissions and strong vertical uplift, localized maximum mixing ratios of 0.6 ppt CH3I at the cold point have been determined for observed peak emissions during the SHIVA (Stratospheric Ozone: Halogen Impacts in a Varying Atmosphere)-Sonne research vessel campaign in the coastal western Pacific. The other two campaigns give considerably smaller maxima of 0.1 ppt CH3I in the open western Pacific and 0.03 ppt in the coastal eastern Atlantic. In order to assess the representativeness of the large local mixing ratios, we use climatological emission scenarios to derive global upper air estimates of CH3I abundances. The model results are compared with available upper air measurements, including data from the recent ATTREX and HIPPO2 aircraft campaigns. In the eastern Pacific region, the location of the available measurement campaigns in the upper TTL, the comparisons give a good agreement, indicating that around 0.01 to 0.02 ppt of CH3I enter the stratosphere. However, other tropical regions that are subject to stronger convective activity show larger CH3I entrainment, e.g., 0.08 ppt in the western Pacific. Overall our model results give a tropical contribution of 0.04 ppt CH3I to the stratospheric iodine budget. The strong variations in the geographical distribution of CH3I entrainment suggest that currently available upper air measurements are not representative of global estimates and further campaigns will be necessary in order to better understand the CH3I contribution to stratospheric iodine.
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3

Tegtmeier, S., K. Krüger, B. Quack, E. Atlas, D. R. Blake, H. Boenisch, A. Engel, et al. "The contribution of oceanic methyl iodide to stratospheric iodine." Atmospheric Chemistry and Physics Discussions 13, no. 4 (April 30, 2013): 11427–71. http://dx.doi.org/10.5194/acpd-13-11427-2013.

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Анотація:
Abstract. We investigate the contribution of oceanic methyl iodide (CH3I) to the stratospheric iodine budget. Based on CH3I measurements during three tropical ship campaigns and the Lagrangian transport model FLEXPART we provide a detailed analysis of CH3I transport from the ocean surface to the cold point in the upper tropical tropopause layer (TTL). While average oceanic emissions differ by less than 50% from campaign to campaign, the measurements show much stronger variations within each campaign. A positive correlation between the oceanic CH3I emissions and the efficiency of CH3I troposphere–stratosphere transport has been identified for some cruise sections. The mechanism of strong horizontal surface winds triggering large emissions on the one hand and being associated with tropical convective systems, such as developing typhoons, on the other hand, could explain the identified correlations. As a result of the simultaneous occurrence of large CH3I emissions and strong vertical uplift, localized maximum mixing ratios of 0.6 ppt CH3I at the cold point have been determined for observed peak emissions during the SHIVA-Sonne campaign in the coastal West Pacific. The other two campaigns give considerable smaller maxima of 0.1 ppt CH3I for the TransBrom campaign in the open West Pacific and 0.03 ppt for emissions from the coastal East Atlantic during the DRIVE campaign. In order to assess the representativeness of the large local mixing ratios we use climatological emission scenarios to derive global upper air estimates of CH3I abundances. The model results are compared to available upper air measurements including data from the recent ATTREX and HIPPO2 aircraft campaigns. In the East Pacific region, the location of the available measurement campaigns in the upper TTL, the comparisons give a good agreement indicating that around 0.01 to 0.02 ppt of CH3I enter the stratosphere. However, other tropical regions, which are subject to stronger convective activity show larger CH3I entrainment, e.g., 0.08 ppt in the West Pacific. The strong variations in the geographical distribution of CH3I entrainment suggest that currently available upper air measurements are not representative of global estimates and further campaigns will be necessary in order to better understand the CH3I contribution to stratospheric iodine.
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4

Caron, Maurice, Takeshi Kawamata, Luc Ruest, Pierre Soucy та Pierre Deslongchamps. "The addition of electrophiles on ester enolates containing an oxygen in the β-position. A stereoelectronically controlled reaction". Canadian Journal of Chemistry 64, № 9 (1 вересня 1986): 1781–87. http://dx.doi.org/10.1139/v86-293.

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The enolate anion derived from spiro ketal methyl esters (1, 3, and 4) reacts with various electrophiles (PhSeBr, Ch3I, O2, I2, (CH3S)2, and (PhS)2) to yield as the major product, the isomer resulting from an equatorial approach of the electrophilic reagent. This stereochemically controlled reaction is discussed in terms of stereoelectronic effects that increase the electron density of the α face of the enolate anion.
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5

Zhang, Jiaxu, Jing Xie, and William L. Hase. "Dynamics of the F– + CH3I → HF + CH2I– Proton Transfer Reaction." Journal of Physical Chemistry A 119, no. 50 (November 2, 2015): 12517–25. http://dx.doi.org/10.1021/acs.jpca.5b08167.

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6

Stemmler, I., M. Rothe, I. Hense, and H. Hepach. "Numerical modelling of methyl iodide in the eastern tropical Atlantic." Biogeosciences 10, no. 6 (June 25, 2013): 4211–25. http://dx.doi.org/10.5194/bg-10-4211-2013.

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Abstract. Methyl iodide (CH3I) is a volatile organic halogen compound that contributes significantly to the transport of iodine from the ocean to the atmosphere, where it plays an important role in tropospheric chemistry. CH3I is naturally produced and occurs in the global ocean. The processes involved in the formation of CH3I, however, are not fully understood. In fact, there is an ongoing debate whether production by phytoplankton or photochemical degradation of organic matter is the main source term. Here, both the biological and photochemical production mechanisms are considered in a biogeochemical module that is coupled to a one-dimensional water column model for the eastern tropical Atlantic. The model is able to reproduce observed subsurface maxima of CH3I concentrations. But, the dominating source process cannot be clearly identified as subsurface maxima can occur due to both direct biological and photochemical production. However, good agreement between the observed and simulated difference between surface and subsurface methyl iodide concentrations is achieved only when direct biological production is taken into account. Production rates for the biological CH3I source that were derived from published laboratory studies are shown to be inappropriate for explaining CH3I concentrations in the eastern tropical Atlantic.
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7

Stemmler, I., M. Rothe, and I. Hense. "Numerical modelling of methyl iodide in the Eastern Tropical Atlantic." Biogeosciences Discussions 10, no. 1 (January 24, 2013): 1111–45. http://dx.doi.org/10.5194/bgd-10-1111-2013.

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Анотація:
Abstract. Methyl iodide (CH3I) is a volatile organic halogen compound that contributes significantly to the transport of iodine from the ocean to the atmosphere, where it plays an important role in tropospheric chemistry. CH3I is naturally produced and occurs in the global ocean. The processes involved in the formation of CH3I, however, are not fully understood. In fact, there is an ongoing debate whether production by phytoplankton or photochemical degradation of organic matter is the main source term. Here, both the biological and photochemical production mechanisms are considered in a biogeochemical module that is coupled to a one-dimensional water column model for the Eastern Tropical Atlantic. The model is able to reproduce observed subsurface maxima of CH3I concentrations. But, the dominating source process cannot be clearly identified as subsurface maxima can occur due to both, direct biological and photochemical production. However, good agreement between the observed and simulated difference between surface and subsurface methyl iodide concentrations is achieved only when direct biological production is taken into account. Published production rates for the biological CH3I source that were derived from laboratory studies are shown to be inappropriate for explaining CH3I concentrations in the Eastern Tropical Atlantic.
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8

Stemmler, I., I. Hense, B. Quack, and E. Maier-Reimer. "Methyl iodide production in the open ocean." Biogeosciences 11, no. 16 (August 22, 2014): 4459–76. http://dx.doi.org/10.5194/bg-11-4459-2014.

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Abstract. Production pathways of the prominent volatile organic halogen compound methyl iodide (CH3I) are not fully understood. Based on observations, production of CH3I via photochemical degradation of organic material or via phytoplankton production has been proposed. Additional insights could not be gained from correlations between observed biological and environmental variables or from biogeochemical modeling to identify unambiguously the source of methyl iodide. In this study, we aim to address this question of source mechanisms with a three-dimensional global ocean general circulation model including biogeochemistry (MPIOM–HAMOCC (MPIOM – Max Planck Institute Ocean Model HAMOCC – HAMburg Ocean Carbon Cycle model)) by carrying out a series of sensitivity experiments. The simulated fields are compared with a newly available global data set. Simulated distribution patterns and emissions of CH3I differ largely for the two different production pathways. The evaluation of our model results with observations shows that, on the global scale, observed surface concentrations of CH3I can be best explained by the photochemical production pathway. Our results further emphasize that correlations between CH3I and abiotic or biotic factors do not necessarily provide meaningful insights concerning the source of origin. Overall, we find a net global annual CH3I air–sea flux that ranges between 70 and 260 Gg yr−1. On the global scale, the ocean acts as a net source of methyl iodide for the atmosphere, though in some regions in boreal winter, fluxes are of the opposite direction (from the atmosphere to the ocean).
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9

Stemmler, I., I. Hense, B. Quack, and E. Maier-Reimer. "Methyl iodide production in the open ocean." Biogeosciences Discussions 10, no. 11 (November 8, 2013): 17549–95. http://dx.doi.org/10.5194/bgd-10-17549-2013.

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Анотація:
Abstract. Production pathways of the prominent volatile organic halogen compound methyl iodide (CH3I) are not fully understood. Previous model studies suggest either production via photochemical degradation of organic material or rather phytoplankton production. Correlations between biological and environmental variables derived from observations also suggest both production pathways. In this study we aim to address this question of source mechanisms with a global three-dimensional ocean general circulation model including biogeochemistry (MPIOM-HAMOCC) by carrying out a series of sensitivity experiments. Simulated distribution patterns and emissions of CH3I differ largely for the different production pathways. However, the evaluation of our model results with observations from a newly available global data set shows that observed surface concentrations of CH3I can be best explained by the photochemical production pathway. Our results further emphasize that correlations between CH3I and abiotic or biotic factors do not necessarily provide meaningful insights concerning the source of origin. Overall, we find a net global annual CH3I air–sea flux that ranges between 70 and 260 Gg yr−1. Hence, at the global scale the ocean is a net source of methyl iodide for the atmosphere, though in some regions in boreal winter fluxes are of opposite direction (from the atmosphere to the ocean).
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10

Buldyreva, J., A. Dudaryonok, and N. Lavrentieva. "Temperature-dependence parameters for CH3I-O2 and CH3I-air line-broadening coefficients." Journal of Quantitative Spectroscopy and Radiative Transfer 284 (July 2022): 108164. http://dx.doi.org/10.1016/j.jqsrt.2022.108164.

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Дисертації з теми "CH3I"

1

Krueger, Charles Winslow. "Chemical vapor etching of GaAs by CH3I." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/37507.

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2

Houjeij, Hanaa. "Etude expérimentale des réactions de capture/désorption des iodes gazeux (I2, CH3I) sur des aérosols environnementaux." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0172.

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Анотація:
Lors d'un grave accident de centrale nucléaire l'iode gazeux I131, émit principalement sous les formes I2 ou CH3I, peut affecter la santé humaine et l'environnement lors de son rejet dans l'atmosphère. Les modèles de dispersion de l'iode ne tiennent pas compte de la réactivité de l'iode avec les espèces gazeuses ou les aérosols atmosphériques. Cependant, la modification de la spéciation chimique et/ou la forme physique des composés de l’iode n’est pas sans conséquence sur leur dispersion et leurs impacts sanitaires. Dans le cadre de l'amélioration des outils de simulation de la dispersion atmosphérique de l’iode radioactif, ce travail vise à contribuer à l'état actuel des connaissances sur la chimie de l'iode par une approche expérimentale permettant la compréhension des processus d'interaction entre CH3I gazeux, les aérosols et l'eau.L'interaction entre CH3I et l'eau a été étudiée à l'échelle moléculaire par des expériences en matrice cryogénique appuyées par des calculs théoriques. Un excès d'eau en regard de CH3I, a été utilisé pour simuler les conditions atmosphériques. Les dimères et trimères de CH3I sont observés malgré la quantité élevée d'eau ainsi que la formation d’agrégats mixtes de CH3I et de polymères d’eau. Ceci peut s'expliquer par la faible affinité du CH3I pour l'eau. Dans l'atmosphère, CH3I et H2O gazeux formeront probablement des agrégats d'eau et des polymères de CH3I au lieu d'hétéro complexes de type (CH3I)m-(H2O)n. L'interaction entre CH3I et la glace amorphe en tant que modèle de glace atmosphérique a fait l'objet d'une étude préliminaire. L'adsorption de CH3I sur la glace amorphe et sa désorption complète au-delà de 47 K ont été observés.L'étude expérimentale des processus d’interactions entre CH3I et le NaCl sec et humide comme modèle des sels marins a été réalisée en utilisant la Spectroscopie Infrarouge à Transformée de Fourier par Réflexion Diffuse (DRIFTS). Les spectres DRIFTS de la surface de NaCl mettent en évidence CH3I adsorbé sur la surface de NaCl. Les spectres FTIR montrent de nouvelles bandes d’absorption, qui n’ont pas pu être clairement attribuées. Le processus d'adsorption de CH3I sur NaCl est probablement une chimisorption puisqu'aucune désorption n'a été observée. Nous avons démontré que l'adsorption du CH3I n’atteint pas la saturation même après 5 heures d’exposition. Ce processus présente une cinétique d’ordre 1 par rapport à la concentration de CH3I en phase gazeuse. Les coefficients d'absorption sont de l'ordre de 3 × 10-11, avec une énergie globale d'absorption de -39 kJ.mol-1. Ces résultats montrent une faible probabilité de capture des molécules de CH3I par la surface de NaCl. La présence d'eau à la surface de NaCl ne semble pas modifier l'interaction entre CH3I et NaCl, ce qui est cohérent avec sa faible affinité pour l'eau.Les interactions de CH3I avec divers solides inorganiques et organiques comme modèles pour les aérosols atmosphériques ont été étudiées à l’aide d’un réacteur statique couplé à la chromatographie en phase gazeuse permettant de suivre la phase gazeuse. Nous avons montré une faible interaction entre CH3I et les aérosols étudiés indiquant sa faible affinité pour les surfaces des aérosols quelle que soit leur composition. Nous émettons l'hypothèse que la teneur en eau en surface de l'aérosol est un paramètre clé. Ainsi, lorsqu'il est libéré dans l'atmosphère, CH3I interagit très peu avec la surface des aérosols et reste en phase gazeuse. Cependant, bien qu’en faible teneur, CH3I est irréversiblement adsorbé à la surface des sels d’halogénures, ce qui pourrait être pris en compte dans le modèle de dispersion pour en évaluer l’impact
Gaseous iodine I131 mainly under I2 or CH3I forms, when released into the atmosphere during a severe nuclear power plant accident may affect both human health and environment. The atmospheric dispersion models of iodine do not take into account the potential reactivity of iodine with atmospheric gas or particles species. However, the modification of the chemical speciation and/or the physical form of iodine compounds is not without consequences on the transport of iodine in the atmosphere and its health effects. Within the framework of improving the atmospheric dispersion tools of radioactive iodine, this work aims to contribute to the actual state of knowledge of atmospheric iodine chemistry by experimental approaches focusing on understanding the CH3I-aerosols and CH3I-water interaction processes.The interaction between CH3I and water at the molecular scale has been investigated using cryogenic matrix experiments supported by theoretical DFT calculations. A large excess of water regarding CH3I was used in order to mimic atmospheric conditions. Dimers and trimers of CH3I are observed despite the high water amount in the initial mixture together with mixed aggregates between CH3I and water polymers. This may be explained by the low affinity of CH3I with water. This result highlights that, in the atmosphere, gaseous CH3I and H2O will likely form aggregates of water and CH3I polymers instead of (CH3I)m-(H2O)n hetero complexes. Further, the interaction between CH3I and amorphous ice as a model of atmospheric ice have been preliminary investigated. The adsorption of CH3I on amorphous has been observed but with a complete desorption of CH3I above 47 K.Experimental study of interaction processes between gaseous iodine (CH3I) and both dry and wet NaCl as surrogate of sea salt aerosols has been carried out using Diffuse Reflectance Infrared Fourier Transformed Spectroscopy (DRIFTS). The DRIFTS spectra of NaCl surface clearly evidenced adsorbed CH3I on the NaCl surface particles. The FTIR spectra revealed new absorption bands that have been not clearly attributed. The adsorption process of CH3I on NaCl is likely a chemisorption since no desorption was observed. We have demonstrated that the adsorption of CH3I on NaCl did not reach saturation even after 5 hours of continuous flow of CH3I. CH3I capture at the NaCl surface presents a 1st order kinetics relative to its gas phase concentration. The uptake coefficients were determined to be in the order of 3 × 10-11, with a global adsorption energy of about -39 kJ.mol− 1. These results show a low probability of CH3I molecules to be captured by NaCl surface. The presence of water on the surface of NaCl seems to have no effect on the interaction between CH3I and NaCl, which is consistent with the low affinity of CH3I for water.The interactions of CH3I with various inorganic and organic powdered solids as models for atmospheric aerosols have been investigated using static reactor coupled with gas chromatography (GC) allowing the monitoring of the gas phase. We have highlighted a weak interaction between CH3I and inorganic and organic aerosols indicating a low affinity of CH3I whatever the aerosol surface composition. We hypothesis that the water content at the aerosol surface is a key parameter. So that, when released in the atmosphere, CH3I will interact very little with the surface of the aerosols and will stay in the gaseous phase. However, although in low content, a part of CH3I is irreversibly adsorbed on the surface of the halide salts that could be considered in the atmospheric iodine model to estimate potential impact
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3

Troitsyna, Larisa. "Approche semi-classique aux paramètres collisionnels de raies spectrales de CH3I pour applications atmosphériques et planétologiques." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2021. http://www.theses.fr/2021UBFCD061.

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Анотація:
La molécule d'iodure de méthyle CH3I est devenue récemment l'objet d'études spectroscopiques intenses en raison de son rôle dans la diminution de la couche d'ozone et de son danger pour la santé humaine au cas d'une émission accidentelle dans l’atmosphère. La bande fondamentale nu6 apparaît particulièrement adaptée à la détection atmosphérique de CH3I, car elle tombe dans la fenêtre de transparence à 11mu m. Cependant, les paramètres spectroscopiques actuellement disponibles pour CH3I perturbé par les principales espèces atmosphériques sont limités à quelques mesures extrêmement rares à température ambiante et manquent dans les bases de données spectroscopiques. Pour compléter / remplacer les données expérimentales manquantes, dans le cadre du Projet de Recherche International franco-russe SAMIA, les coefficients d'élargissement de raies pour les paires atmosphériques clés CH3I-CH3I, CH3I-N2, CH3I-O2, CH3I-air sont calculés de manière semi classique, avec l'utilisation du formalisme de Robert-Bonamy amélioré par des trajectoires exactes, dans de larges gammes de nombres quantiques rotationnels typiquement demandés par les bases de données (0 < J < 70, K < 20) et pour les six sous-branches RP, PP, RQ PQ, RR, PR de la bande nu6 ; leur dépendance vibrationnelle ainsi que les dépendances de sous-branche et en température (avec la loi exponentielle traditionnelle et la nouvelle loi "double-power" ) sont également abordées. Des arguments sont donnés pour justifier ce choix de la méthode facilement praticable face à ses modifications avancées mais moins en accord avec les mesures. Des comparaisons sont faites avec les mesures disponibles et des résultats semi empiriques alternatifs, indiquant l'importance du modèle de potentiel d'interaction, en particulier de sa partie isotrope pilotant les trajectoires, pour une description réaliste des largeurs de raies collisionnelles
Methyl iodide molecule CH3I has come recently into focus of intense spectroscopic studies due to its role in the ozone layer depletion and its danger for human health in case of an accidental release in the atmosphere. For its atmospheric detection particularly suitable is the nu6 fundamental, which falls into the transparency window at 11 mu m. However, currently available spectroscopic line-shape parameters for CH3I perturbed by main atmospheric species are limited to some extremely scarce measurements at ambient temperature and are missing in spectroscopic databases. To supplement/replace the missing experimental data, in the frame of the French-Russian International Research Project SAMIA, room-temperature (296 K) line-broadening coefficients for the key atmospheric pairs CH3I-CH3I, CH3I-N2, CH3I-O2,CH3I-air are calculated semi-classically, with the use of the Robert-Bonamy formalism improved by exact trajectories, in wide ranges of rotational quantum numbers typically requested by databases (0 < J < 70, K < 20) and for all six sub-branches RP, PP, RQ PQ, RR, PR of the nu6 band; their vibrational dependence as well as sub-branch dependence and temperature dependence (with the traditional power and recently suggested double-power laws) are also addressed. Arguments are given to support this choice of the easily practicable method contrary to its advanced but less agreeing with measurements modifications. Comparisons are made with available measurements and alternative semi-empirical results, indicating the importance of the interaction potential model, in particular of its isotropic part governing the trajectories, for a realistic description of collisional line-widths
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4

Winkoun, Dominique. "Étude par coïncidences photoion-photoion de la formation et la dissociation d'ions moléculaires doublement chargés." Paris 11, 1986. http://www.theses.fr/1986PA112163.

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La méthode PIPICO (photoion-photoion coïncidences) par l’utilisation conjointe du rayonnement synchrotron pour la formation d’ions moléculaires et des techniques de coïncidences ion-ion pour l’analyse des paramètres de la dissociation a permis de déterminer les énergies des états électroniques dissociatifs (ou rapidement prédissociés) d’ions moléculaires doublement chargés, et de mesurer les sections efficaces partielles de formation de ces états. L’identification des différentes voies de fragmentation de ces espèces doublement chargées et la mesure de l’énergie cinétique des fragments a permis d’autre part de réaliser des études d’état à état de la fragmentation de petites espèces polyatomiques (CH₄++, CO₂++, NH₃++, CH₃l++) au cours desquelles on détermine les états électroniques des ions parents et ceux des ions fragments. Dans le cas de CH₃l++, on a de plus étudié la fragmentation des ions doublement chargés produits par excitation résonnante d’un électron interne (4d) de l’atome d’iode. Une partie de cette thèse est consacrée au calcul (SCP) avec interaction de configuration des énergies des états électroniques d’ions doublement chargés
The PIPICO method (photoion-photoion coincidences) by use of synchrotron radiation for molecular ions formation and ion-ion coincidences techniques for the analysis of dissociation parameters allowed the determination of dissociative (or rapidly predissociated) electronic states of doubly charged molecular ions, and measurement of their formation cross sections. State to state studies of the fragmentation of small polyatomic species (CH₄++, CO₂++, NH₃++, CH₃l++). In which both the Initial state of the parent ion and the final states of the fragments are determined, were performed by measuring the kinetic energy of the fragments. Ln the case of CH₃l++ we also studied the fragmentation of doubly charged species following the resonant excitation of 4d inner shell electron of iodine. A part of this thesis is devoted to the SCF calculation with configuration interaction of the electronic energies of doubly charged species
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5

李兆燊 and Shiu-san Lee. "Pu Sung-ling's social criticism as reflected in 'Liao-chai chi-i'." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1986. http://hub.hku.hk/bib/B31230647.

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6

Choi, Pyuck-Pa. "Untersuchungen zur Korngrenzensegregation in nanokristallinen Al-Cu- und Co-P-Legierungen mittels 3d-Atomsondentomographie." Doctoral thesis, [S.l.] : [s.n.], 2003. http://webdoc.sub.gwdg.de/diss/2003/choi/choi.pdf.

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7

Chai, Jianfang. "Synthesis, structure and reactivity of manganese complexes supported by carbon or nitrogen donor ligands." Doctoral thesis, [S.l. : s.n.], 2004. http://webdoc.sub.gwdg.de/diss/2004/chai/chai.pdf.

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Chuah, Chai Wen. "Key derivation function based on stream ciphers." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/71025/1/Chai%20Wen_Chuah_Thesis.pdf.

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A key derivation function (KDF) is a function that transforms secret non-uniformly random source material together with some public strings into one or more cryptographic keys. These cryptographic keys are used with a cryptographic algorithm for protecting electronic data during both transmission over insecure channels and storage. In this thesis, we propose a new method for constructing a generic stream cipher based key derivation function. We show that our proposed key derivation function based on stream ciphers is secure if the under-lying stream cipher is secure. We simulate instances of this stream cipher based key derivation function using three eStream nalist: Trivium, Sosemanuk and Rabbit. The simulation results show these stream cipher based key derivation functions offer efficiency advantages over the more commonly used key derivation functions based on block ciphers and hash functions.
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9

Bossoutrot, Valérie. "Etudes cinétiques expérimentales et théoriques des réactions des intermédiaires CH3, CH3O, CH3SO avec NO2 en relation avec l'oxydation atmosphérique du sulfure de diméthyle (DMS)." Orléans, 2000. http://www.theses.fr/2000ORLE2030.

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Ce travail a consisté d'une part en une étude expérimentale et théorique de la réaction entre CH3SO et NO2 et de la décomposition thermique de CH3SO2, et d'autre part une étude expérimentale des réactions entre CH3 et CH3O et NO2. L'étude des réactions des intermédiaires soufrés visait à mieux connaître le mécanisme d'oxydation atmosphérique du DMS et à en préciser en particulier le rendement en SO2 dont dépend l'impact climatique du DMS. L'étude des réactions de CH3 et CH3O avec NO2 avait pour but de fournir des données nécessaires à la simulation des systèmes réactionnels utilisés pour l'étude des radicaux soufrés. Les constantes de vitesse des réactions entre CH3, CH3O et NO2 ont été déterminées par la méthode de photolyse laser pulsée couplée à la fluorescence induite par laser (FIL) des radicaux CH3O. Cette même méthode ainsi que celle du réacteur à écoulement couplé à l'analyse par spectrométrie de masse et par FIL (suivi de CH3O et SO2) ont été utilisées pour l'étude de la réaction CH3SO+NO2 et de la décomposition thermique de CH3SO2. L'étude théorique de ces réactions a été effectuée au laboratoire au moyen des méthodes de chimie quantique et RRKM. Notre étude des réactions de CH3 et CH3O avec NO2 a permis la détermination des valeurs limites basse pression et haute pression des constantes de vitesse. Ces résultats contribuent ainsi à décrire précisément la dépendance en pression de ces constantes de vitesse. Les constantes de vitesse de réaction CH3SO + NO2 et de la décomposition thermique de CH3SO2 à température ambiante ont été déterminées. La décomposition spontanée de l'intermédiaire CH3SO2 a été mis en évidence expérimentalement et confirmés par calculs (ab initio et RRKM). Ce travail conduit à proposer la décomposition spontanée de CH3SO2 comme nouvelle source de SO2 dans l'oxydation atmosphérique du DMS. De tels résultats supportent ainsi l'hypothèse CLAW sur le rôle régulateur potentiel du DMS dans le climat.
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10

Lissner, Patricia Ann. "Chi-thinking." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7687.

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Анотація:
Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: English Language and Literature. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Книги з теми "CH3I"

1

Kuang, Ni. Chui chi. Taibei Shi: Feng yun shi dai chu ban you xian gong si, 1993.

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Lian, Qing. Chui fu mi chi. Xianggang: Xing he chu ban she, 1998.

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Shang-hai shu hua chʻu pan she., ред. Tung Chʻi-chʻang hua chi. Shang-hai: Shang-hai shu hua chʻu pan she, 1989.

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Wang Tseng-chʻi chʻüan chi. Pei-ching: Pei-ching shih fan ta hsüeh chʻu pan she, 1998.

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1912-, Nakao Ryōichi, ред. Chʻi chi "niao liao fa". Tʻai-pei shih: Kuo chi tsʻun wen kʻu shu tien, 1993.

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Tine, Robert. Ti liu kan chui chi ling. Taibei: Bu er, 1992.

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7

Zhongguo yu qi quan ji bian ji wei yuan hui, ред. Chung-kuo yü chʻi chʻüan chi. Shih-chia-chuang shih: Ho-pei mei shu chʻu pan she, 1991.

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Chung-kuo tʻung chi chai yao, 1985. [Peking]: Chung-kuo tʻung chi chʻu pan she, 1985.

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9

Chung-kuo chʻing tʻung chʻi chüan chi pien chi wei yüan hui., ред. Chung-kuo chʻing tʻung chʻi chʻüan chi. Pei-ching: Wen wu chʻu pan she, 1993.

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10

Ch'oe Ch'i-wŏn_P'ungnyu T'ansaeng (2014 Yesul ŭi Chŏndang Sŏye Pangmulgwan Chŏndang). Ch'oe Ch'i-wŏn_p'ungnyu t'ansaeng: Choe Chi-won : pungnyu. Sŏul T'ŭkpyŏlsi: Yesul ŭi Chŏndang, 2014.

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Частини книг з теми "CH3I"

1

Demaison, J. "34 CH3I Iodomethane." In Symmetric Top Molecules, 88–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-47532-3_36.

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Holze, Rudolf. "Ionic conductivities of CH3I." In Electrochemistry, 102. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_85.

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3

Kumar, M., and R. Gupta. "Magnetic anisotropy data of CH3I." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 342. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_274.

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Kumar, M., and R. Gupta. "Diamagnetic bulk susceptibility data of CH3I." In Diamagnetic Susceptibility of Organic Compounds, Oils, Paraffins and Polyethylenes, 141. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-45860-9_46.

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5

Kalinowski, H. O., M. Kumar, V. Gupta, and R. Gupta. "Nuclear magnetic resonance data of CH3I." In Chemical Shifts and Coupling Constants for Carbon-13, 77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-45285-0_41.

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6

Kalinowski, H. O., M. Kumar, V. Gupta, and R. Gupta. "Nuclear magnetic resonance data of CH3I." In Chemical Shifts and Coupling Constants for Carbon-13, 78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-45285-0_42.

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7

Schmutterer, H., and R. P. Singh. "Effects on Viruses and Organisms: Sections 3.9.3 - 3.10." In The Neem Tree, 326–66. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527603980.ch3i.

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8

Gunderov, D. V., A. G. Popov, N. N. Schegoleva, V. V. Stolyarov, and A. R. Yavary. "Phase Transformation in Crystalline and Amorphous Rapidly Quenched Nd-Fe-B Alloys under SPD." In Nanomaterials by Severe Plastic Deformation, 165–69. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527602461.ch3i.

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9

Kennedy, Seamus, Brian Herron, Pablo Hernández-Jáuregui, Gordon Allan, John Kirk, and Jorge Moreno-López. "Neuropathology of Porcine Rubulavirus Infection." In Trends in Emerging Viral Infections of Swine, 87–90. Ames, Iowa, USA: Iowa State Press, 2008. http://dx.doi.org/10.1002/9780470376812.ch3i.

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10

Wichterle, I., J. Linek, Z. Wagner, J. C. Fontaine, K. Sosnkowska-Kehiaian, and H. V. Kehiaian. "Vapor-Liquid Equilibrium of the Mixture CH3I + C4H10O (LB3865, EVLM 1111)." In Binary Liquid Systems of Nonelectrolytes. Part 2, 3094–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-70745-5_1129.

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Тези доповідей конференцій з теми "CH3I"

1

Martins Freitas, F. F., B. J. Costa Cabral, and F. M. S. Silva Fernandes. "Dynamics of liquid CH3I." In The first European conference on computational chemistry (E.C.C.C.1). AIP, 1995. http://dx.doi.org/10.1063/1.47711.

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Ishii, Tasuku, Daisuke Akiyama, Akira Kirishima, Nobuaki Sato, and Tadashi Narabayashi. "Sorption of Radioactive Methyl Iodide by Silver Doped Zeolite for Filtered Venting System." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60819.

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Filtered containment venting system (FCVS) is an emergency response system for severe accident. FCVS reduces the pressure in reactor vessel and removes radioactive iodine and cesium. Recently, silver doped zeolite (AgX) has been attracting attentions since it is believed to remove over 99.99% of CH3I in the ventilation gas. However, the reliable data of AgX for CH3I sorption under expected severe accident conditions are still limited. Therefore, the sorption behavior of CH3I on AgX was investigated under several expected conditions. In this study, the CH3I labeled by 125I tracer was synthesized by isotope exchange reaction, and it was devoted for sorption experiment on AgX. Sorption experiment using stable CH3I was also conducted by the same procedure. From results of the sorption experiment, over 99.9% of 2.28g of CH3I were sorbed by 10g of AgX. After the sorption experiment, AgX samples were analyzed by powder X-ray diffraction (XRD) and SEM–EDX. These results indicated the distribution of Ag agreed with that of I in micro area of AgX. For the evaluation of apparent sorption capacity of AgX, breaking through experiment was carried out. The apparent sorption capacity of AgX for CH3I was determined as 0.25g / g (AgX) at 24°C. The breaking through experiment was also carried out for the evaluation of CH3I flux and humidity effects in the vent gas. The effect of temperature on the sorption capacity was also studied. When the flux of CH3I supply was increased from 1.09 × 10−4 to 2.33 × 10−4g/cm2s, apparent sorption capacity was unchanged (= 0.21g / g (AgX)). Besides, the apparent sorption capacity was unchanged in the humidity range of ∼0 % H2O to 0.01 % H2O, while it decreased to 0.19 g / g (AgX) at 3% H2O. When sorption temperature increased to 170 °C, the apparent sorption capacity also increased to 0.69 g / g (AgX).
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Han, J. C., Y. F. Gua, S. J. Su, J. F. Chen, Y. F. Ji, and S. H. Liu. "The mechanism for multiphoton ionization and fragmentation of CH3I." In AIP Conference Proceedings Volume 146. AIP, 1986. http://dx.doi.org/10.1063/1.35894.

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4

Al-Basheer, Watheq. "Nonlinear photoionization of supersonically expanded molecular pulses of iodomethane (CH3I)." In Nonlinear Optics and Applications XII, edited by Anatoly V. Zayats, Mario Bertolotti, and Alexei M. Zheltikov. SPIE, 2021. http://dx.doi.org/10.1117/12.2589033.

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5

MISAIZU, FUMINORI, ARI FURUYA, HIRONORI TSUNOYAMA, and KOICHI OHNO. "EXCITED STATE CHARGE TRANSFER AND DISSOCIATION OF Mg+-CH3I COMPLEX." In Clusters and Nano-Assemblies - Physical and Biological Systems. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701879_0012.

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6

Дударёнок, А. С., Н. Н. Лаврентьева, Н. Н. Филиппов та Ж. В. Булдырева. "ТЕМПЕРАТУРНАЯ ЗАВИСИМОСТЬ КОЭФФИЦИЕНТОВ УШИРЕНИЯ ЛИНИЙ CH3I ДАВЛЕНИЕМ АЗОТА И КИСЛОРОДА". У XXVIII Международный симпозиум «Оптика атмосферы и океана. Физика атмосферы». Crossref, 2022. http://dx.doi.org/10.56820/oaopa.2022.70.57.002.

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7

Vechgama, Wasin, and Kampanart Silva. "Study of Fission Product Behavior in Containment Vessel Using Modified ART Mod 2: Update of Cesium and Iodine Compound Models." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82069.

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From the Fukushima accident, Thailand has studied fission product behavior in containment vessel using ART Mod 2 code. Cesium iodide (CsI), cesium hydroxide (CsOH) and iodine (I2) behaviors are studied using modified ART Mod 2 code. However, there are other compounds which are not included in the codes especially cesium and iodine compounds such as from Phébus FPT3 experiment including cesium molybdate (Cs2MoO4), cesium telluride (Cs2Te), methyl iodide (CH3I) and iodine pentoxide (I2O5). The paper objective is to add the four compounds in the codes in order to enlarge the coverage of the code in evaluation fission product behavior in the containment vessel. Physical parameters and models of the four compounds are updated in the codes. It is found that deposition phenomena of Cs2MoO4, Cs2Te CH3I and I2O5 are close to the experiment in case of no chemical reaction.
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Huff, Anna, Ken Leopold, and CJ Smith. "MICROWAVE SPECTRUM OF THE A INTERNAL ROTOR STATE OF Ar-CH3I." In 73rd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.rk04.

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9

Reininger, R., and A. Al-Omari. "Field ionization of high Rydberg states of CH3I in liquid argon." In Proceedings of the 12th International conference on spectral line shapes. AIP, 1995. http://dx.doi.org/10.1063/1.47471.

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SUGITA, A., M. MASHINO, M. KAWASAKI, and Y. MATSUMI. "EFFECT OF IR LASER PULSE ON THE UV PHOTODISSOCIATION OF CH3I AND OCS." In Proceedings of the US-Japan Workshop. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812791948_0011.

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Звіти організацій з теми "CH3I"

1

Nenoff, Tina Maria, Mark A. Rodriguez, N. Soelberg, and Karena Chapman. Determine Mechanism of CH3I Capture in AgZ. Office of Scientific and Technical Information (OSTI), August 2014. http://dx.doi.org/10.2172/1155022.

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Nenoff, Tina Maria, Curtis D. Mowry, and Patrick Vane Brady. CH3I Loading and Sintering Effects on AgI-MOR GCM Durability. Office of Scientific and Technical Information (OSTI), July 2014. http://dx.doi.org/10.2172/1155023.

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R. T. Jubin, N. R. Soelberg, D. M. Strachan, T. M. Nenoff, and B. B. Spencer. Joint Test Plan to Identify the Gaseous By-Products of CH3I Loading on AgZ. Office of Scientific and Technical Information (OSTI), December 2012. http://dx.doi.org/10.2172/1073784.

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4

Jubin, Robert Thomas, Barry B. Spencer, Nick Soelberg, and Denis M. Strachan. Milestone report - M4FT-16OR03010723 - Joint Test Plan to Identify the Gaseous By-Products of CH3I Loading on AgZ. Office of Scientific and Technical Information (OSTI), June 2016. http://dx.doi.org/10.2172/1424494.

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5

Bruffey, S. H., and R. T. Jubin. Complete Phase I Tests As Described in the Multi-lab Test Plan for the Evaluation of CH3I Adsorption on AgZ. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1160273.

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6

Jaboln, Sara. Chai Life. Ames: Iowa State University, Digital Repository, 2014. http://dx.doi.org/10.31274/itaa_proceedings-180814-978.

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7

von Balthasar, Hans Urs. Chi è un laico? Saint John Publications, 2022. http://dx.doi.org/10.56154/u8.

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8

Raman, Roger, and Thomas R. Jarboe. CHI Research. Final Technical Report. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1469681.

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9

McMillan, B. K. Chi-Squared Distribution Parameter Approximation. Fort Belvoir, VA: Defense Technical Information Center, July 1988. http://dx.doi.org/10.21236/ada198927.

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10

Bakewell, Margaret, and Patricia Wittkopp. Basic Probability and Chi-Squared Tests. Genetics Society of America Peer-Reviewed Education Portal (GSA PREP), November 2013. http://dx.doi.org/10.1534/gsaprep.2013.005.

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