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Dissertations / Theses on the topic 'L12 Compounds'
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Jiang, Xia. "Cadmium jump frequencies in L1₂ intermetallic compounds." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Spring2008/x_jiang_042408.pdf.
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Salomaa-Robertson, Terhi. "L2 acquisition of Spanish compounds by native speakers of Finnish." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ57173.pdf.
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Lu, Yeong-Wei. "Sorption of organic compounds on oil shale materials and sorption of selected chemicals on a Western soil." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91135.
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The sorption capacity of a raw shale (Anvil Points), three spent shales, (Antrim, Oxy 6, and Run 16), and a western soil for three organic compounds (2-Hydroxynaphthalene, 1,2,3,4-Tetrahydroquinoline, and 2,3,5-Trimethylphenol) was evaluated by batch and column sorption studies. In addition, the sorption capacity of the western soil for selected inorganic agents (arsenic, cadmium, calcium, potassium, iron, ammonium, fluoride, and sulfate) was also determined.
The results of the study showed that the sorption capacity of oil shales for organic compounds varied with the retorting conditions of spent shales, the characteristics of sorbates, and the number of different sorbates present. The overall sorption capacity of the oil shales and the soil were greatly enhanced in multi-sorbate solutions. On the other hand, mutual inhibition for sorption of individual compounds was evident throughout the study.
The western soil, in general, exhibited a better sorption capacity for organic compounds than Anvil, Oxy 6, and Run 16 shale, yet Antrim shale appeared to be the best sorbent. Sorption of inorganic ions by soil was closely related to the pH of the solution, and was greatly affected by the interactions between ion species in multi-sorbate solutions. The soil had good affinity for arsenic, cadmium and iron, but little sorption capacity for ammonium and sulfate. Desorption of calcium and potassium from the soil was evident.M. Eng.
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Ngan, Alfonso Hing-wan. "The temperature dependence of yield strength in L1 [inferior] 2 compounds." Thesis, University of Birmingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658066.
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Pannier, Andy Joseph. "Reductive transformation of 2,4,6-Trinitrotoluene by Yarrowia lipolytica AN-L15 under conditions of different initial pH of the culture medium or in the presence of ferrihydrite." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/pannier/PannierA0509.pdf.
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Batch and column studies were conducted to examine the difference in the transformation pathways of 2,4,6-trinitrotoluene (TNT) reduction by a hemiascomycetous yeast (Yarrowia lipolytica AN-L15) under conditions of different initial pH of the culture medium or in the presence or absence of ferrihydrite. Using high performance liquid chromatography (HPLC), it was observed that Y. lipolytica AN-L15 was able to transform TNT at three different initial proton concentrations of the culture medium: pH 7.0, pH 6.5, and pH 4.5. In the presence of TNT, Y. lipolytica AN-L15 showed preferential growth (OD₆₀₀) at the lower initial pH of 4.5. The increased growth (OD₆₀₀) resulted in increased reduction of TNT-metabolites in the culture medium with an initial pH of 4.5, as compared to, the culture medium with an initial pH of 6.5 or the culture medium with an initial pH of 7.0. TNT transformation via aromatic ring reduction was the major transformation pathway observed, with the major metabolite being 3-H̄ -TNT. 4-hydroxylaminodinitrotoluene (4-HADNT) was the major metabolite of the nitro-group reduction pathway. In the presence of ferrihydrite at a pH of 7.0, the transformation of TNT by Y. lipolytica AN-L15 showed a change in the transformation pathway. Nitro-group reduction was the major pathway of TNT transformation in the presence of ferrihydrite with 4-HADNT and 2-aminodinitrotoluene (4-ADNT) being the major metabolites formed. The time it took to reduce TNT was longer and the concentrations of TNT-metabolites were lower in the presence of ferrihydrite than in its absence. This may have been due to competition for available electrons between TNT and TNT-metabolites and Fe(III). It is also possible that some of the intermediate products of TNT transformation were oxidized back to TNT-metabolites by Fe(III) resulting in lower concentrations of TNT-metabolites and increased concentrations of Fe(II). This study demonstrates the complexity of the interactions of various environmental parameters, under controlled laboratory conditions, in the transformation of TNT by Y. lipolytica AN-L15.
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Garimella, Narayana. "Multicomponent interdiffusion in austenitic Ni-, Fe-Ni-base alloys and L1₂-Ni₃Al intermetallic for high-temperature applications." Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002521.
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Lence, Nicole Louise. "IMPACT OF GINGER-RELATED COMPOUNDS, ZINGERONE AND CURCUMIN, ON PPARγ ACTIVATION, LIPID ACCUMULATION, AND CELL VIABILITY IN 3T3-L1 FIBROBLASTS." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/theses/1227.
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The prevalence over overweight and obesity has risen dramatically during the past few decades corresponding with a clustering of metabolic pathologies including cardiovascular disease, type 2 diabetes, endometrial, breast, and colon cancers. Obesity is not only implicated as one of the primary causes of these degenerative diseases but also represents a major component of the metabolic syndrome. In obesity, the primary defect leading to these metabolic pathologies appears to be an impairment of adipogenesis resulting in adipocyte hypertrophy and dysfunction. Current pharmacological therapies prescribed for T2DM, such as thiazolidinones (TZDs), improve insulin sensitivity through regulation of adipogenesis. However, utilization of these drugs is often associated with several side effects, including weight gain, liver disease, and bone loss. Thus, there is an important need to identify alternative therapies that can modify these adipogenic regulators without adverse complications. Ginger (Zingiber officinale Roscoe), a member of the Zingiberaceae family, has a long history of use in traditional medicine and as been used for a wide array of ailments such as arthritis, diabetes, nausea, and stroke. Several studies have demonstrated anti-emetic, anti-inflammatory, and anti-carcinogenic properties of ginger. When used at high concentrations (μM), two phytochemcials derived from ginger root curcumin and zingerone, have been shown to promote weight loss and modify adipogenic signaling. However, due to the low bioavailability of curcumin the physiological relevance of these findings remains to be determined. The purpose of this study was to determine the extent to which curcumin and zingerone modify adipogenesis in 3T3-L1 fibroblasts. To determine the effects of the bioactive components in varying concentrations, 3T3-L1 preadipocytes were exposed to either 100pM, 100nM, or 100μM of curcumin or zingerone and tested for cell viability, lipid accumulation, and PPARγ activation. The results of this study suggest that high concentrations of curcumin (100 μM) may be toxic to 3T3-L1 fibroblasts in vitro and significantly inhibit both cell viability and lipid accumulation. The resultant low PPARγ activity may be attributable to cell necrosis rather than dose-dependent inhibition, suggesting need for further research into extreme curcumin supplementation. While results for zingerone did not differ significantly from vehicle, the results of this study provide evidence that further research is needed to ascertain to what extent curcumin and zingerone dose-dependently modify PPARγ and TCF/LEF in 3T3-L1 fibroblasts using lower physiologically relevant doses.
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Ballou, Rafik. "Anisotropies magnétiques du cobalt dans les composés intermétalliques lanthanide-cobalt." Grenoble 1, 1987. http://www.theses.fr/1987GRE10114.
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Analyse phénoménologique des processus d'aimantation des composes YCo5 et GDCo5 mettant en évidence une anisotropie des interactions d'échangé Ln-Co liée à l'anisotropie de polarisation des électrons 5d de l'atome Ln. Etude de l'incidence de l'instabilité du magnétisme de bande 3d sur l'anisotropie magnétique dans les phases Ln2Co7 et LnCo3. Etude de l'anisotropie des systèmes à empilement quasi-unidimensionnel LnCo(1-epsilon ). Analyse de la sélection orbitale induite par les intégrales de transfert
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Omar, Abderrahim. "Contribution à l'étude des propriétés électromagnétitques des couches et multicouches supraconductrices à haute Tc : mesure d'impédance de surface par oscillateur à diode tunnel." Grenoble 1, 1993. http://www.theses.fr/1993GRE10168.
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Nous avons concu et realise un systeme de mesure d'impedance de surface z#s de films minces conducteurs ou supraconducteurs par couplage electromagnetique de ces films a un oscillateur a diode tunnel. La mesure de la resistance de films metalliques (or et aluminium) par cette technique inductive (sans contact) nous a permis, en comparant aux mesures directes (4 fils), de valider cette methode. Nous avons ensuite etudie la reponse electromagnetique de films supraconducteurs d'yba#2cu#3o#7 et de multicouches yba#2cu#3o#7/la#2##xsr#xcuo#4. Cette etude a mis en evidence le caractere granulaire de ces materiaux reflete par des valeurs trop elevees de la profondeur de penetration () et la presence d'une resistance residuelle dans la phase supraconductrice. Le comportement de en fonction de la temperature indique que le couplage intergranulaire serait de type sis dans le cas de films et sns dans le cas des multicouches etudiees. Cette difference devrait avoir son origine dans les procedes et conditions de fabrication de ces echantillons
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Schwerdtfeger, Michael. "Elaboration et caractérisation de multicouches supraconductrices YBaCuO/LaSrCuO." Grenoble 1, 1993. http://www.theses.fr/1993GRE10179.
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Ce travail est consacre a l'elaboration et a la caracterisation structurale et electrique de multicouches supraconductrices de type yba#2cu#3o#7#-#/la#2#-#xsr#xcuo#4 (ybco/lasrcuo). Deux dopages differents en strontium ont ete choisis afin de separer les couches d'ybco soit par des couches semi-isolantes de la#2cuo#4 (lco) pour x=0, soit par des couches metalliques de la#1#,#8#5sr#0#,#1#5cuo#4 (lsco) pour x=0,15. Le principal objectif de ce travail est donc d'etudier comment l'intercalation de couches de lasrcuo, de nature et d'epaisseur differentes, affecte la dimensionnalite et l'anisotropie de ces systemes. Les echantillons sont elabores par photo-ablation avec un laser excimere d'une longueur d'onde de 248 nm (krf). Une etude prealable, portant sur les proprietes structurales et electriques de couches minces d'ybco, de lco et de lsco, a permis de constituer une base de reference pour l'etude du comportement des multicouches. Les proprietes structurales et morphologiques ont ete analysees par diffraction de rayons x, par rbs et par microscopie electronique. En particulier les figures de poles x ont revele la rotation des axes a et b des couches de lco de 45 par rapport aux axes des substrats de srtio#3. L'etude de la magnetoresistance et des fluctuations de conductance des couches d'ybco a montre que ce compose est moderement anisotrope et qu'il ne presente pas un comportement purement bidimensionnel. La derniere partie de ce memoire est consacree a l'etude des proprietes des multicouches. Ainsi, la diffraction de rayons x a permis de constater la bonne qualite epitaxiale des echantillons, avec une rotation de 45 des axes a et b des couches de lco par rapport aux axes des substrats et des couches d'ybco. Cette etude a egalement revele la presence probable de contraintes aux interfaces entre les couches d'ybco et les couches de lasrcuo. A partir de l'analyse de la transition resistive, des fluctuations de conductance et de la magnetoresistance, il a ete montre que le decouplage des couches d'ybco par des couches de lasrcuo d'epaisseur croissante resulte en un abaissement de la temperature critique, la suppression du passage d'un regime bidimensionnel a un regime tridimensionnel et une anisotropie accrue
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Vamsi, Koruprolu Venkata. "Planar Fault Energies in L12 Compounds." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4254.
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High temperature metallic structural materials, such as Ni-base superalloys owe their strength to a two-phase microstructure consisting of an fcc matrix strengthened by intermetallic A3B type precipitates. The performance of these alloys derives from the exceptional high temperature strength of the L12-ordered A3B precipitate, which in turn is strongly influenced by planar faults created when the precipitate is sheared. In this context, the broad goal of this work is to understand the role of composition on planar fault energies in A3B compounds with L12 structure. Towards this aim, electronic structure calculations using density functional theory (DFT) was used to evaluate fault energies through direct simulations of faults and though indirect means involving analytical models. In the first part of the thesis, the effect of composition on the planar fault energies, elastic anisotropy, deformation modes and yield strength anomaly were explored in five pseudo-binaries (Ni, Co)3(Al,X) compositions of γ' (L12), where X = Ti, Ta, W, Ni. It was observed fault energies and deformation modes are sensitive to composition. The results are in good agreement with literature and can provide explanations for the deformation behaviour of both (Ni)3(Al, X) and Co3(Al,W). Though the results are encouraging, the above DFT calculations of fault energies are time-consuming, highlighting the need for high throughput models. In the second part of the thesis, such a model was developed to estimate these energies in well-known and novel A3B compositions. The new model treats the planar fault as a diffuse interface and allows estimation of fault energy in terms of energy of geometrically close packed structures with the same A3B composition and a bonding environment akin to that of the fault. The proposed model was used to predict energies of different superlattice faults in over 40 A3B compounds. The model was found to be highly accurate even without use of fitting parameters and has a fifteen-fold computational advantage over direct simulation. The model was extended to novel A3B compounds based on Pt3X, Rh3X and Ir3X where data is presently lacking. Despite the efficiency of the model, it had limitations in predicting fault energies in non-binary compositions. To account for this, in the last section of this thesis, a novel quasi-chemical model incorporating the far-field composition effects, was developed. The model was validated for several pseudo-binary systems and it was found that be more accurate than the diffuse interface model. The two models were then extended to predict fault energies in binary L12-ordered A3B compounds at high temperatures, complex multicomponent L12-ordered A3B compounds, and binary D019-ordered A3B compounds.
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Wu, Ming-Shian, and 吳明憲. "Structure and properties of (La2-xSrx)MO4 (M = Mn, Co) compounds." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/58436412768088077281.
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碩士淡江大學
化學學系
91
Polycrystalline samples of (La2-xSrx)MO4 (M = Mn, Co) with 1.10 ≤ x ≤ 1.40 for Mn and 0.60 ≤ x ≤ 1.20 for Co were synthesized. All of the single phase materials have K2NiF4 structure with tetragonal symmetry and a space group of I4/mmm. Increasing x, a-axis increases and the c-axis decreases for the Mn-series; On the other hand, a-axis decreases and the shortest c-axis is observed for x = 0.90 of the Co-series samples.Among them, (La0.6Sr1.4)MnO4, has the largest magnetoresistance ratio ([ρ(H) - ρ(0)]/ ρ(0)), which reaches to 78.4﹪at 48 K. For samples with x ³ 1.00, spin glass state exists at low temperature and a hump observed from the susceptibility(χ) measurement , that is probably caused by the interactions of several magnetic phases. It is not possible to obtain single phase materials with 0.60 ≤ x ≤ 1.00 for the Mn containing samples within the heat treated temperature range at 1000 - 1600 ْC. Impurities were easily observed under SEM and X-ray diffraction patterns. Increasing the heating period and decreasing the temperature, the amount of ABO3 phase increases. In order to obtain single phase materials, it probably needs to raise the temperature to higher than 1600 ْC and heats the sample a short period (< 1 h) may be batter.
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Vikram, Amit. "Citrus Bioactive Compounds: Isolation, Characterization and Modulation of Bacterial Intercellular Communication and Pathogenicity." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9519.
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The secondary metabolites of citrus such as limonoids and flavonoids constitute an important part of human diet. The present work was undertaken to elucidate the effect of citrus limonoids and flavonoids on the bacterial cell-cell signaling in Vibrio harveyi, Escherichia coli O157:H7 and Salmonella Typhimurium LT2. The first experiment was focused on purification of limonoids from grapefruit and sour orange seeds. The limonoids were extracted using organic solvents and purified by chromatographic techniques. A total of ten limonoids (7 aglycones and 3 glucosides) were purified.
Currently, simultaneous measurement of aglycones and glucosides of limonoids is not available. To address this limitation, an analytical method using high performance liquid chromatography was developed with the capability of measuring both aglycones and glucosides in a single run. Furthermore, its applicability in the fruit and juice samples was demonstrated.
The third study investigated the V. harveyi cell-cell signaling inhibitory potential of purified limonoids. Isolimonic acid, ichangin, obacunone and nomilin were showed potent inhibitory activity. Furthermore, isolimonic acid and ichangin inhibit the signal transduction pathway by up-regulating the response regulator luxO. Isolimonic acid was also found to be a potent inhibitor of Escherichia coli O157:H7 cell-cell signaling in the fourth study. The results demonstrated that isolimonic acid inhibits the autoinducer/epinephrine mediated cell-cell signaling, biofilm and virulence in QseBC and QseA dependent fashion. Further investigations using limonin analogues, in the fifth study, demonstrated that the analogue limonin-7-methoxime inhibited the E. coli biofilm in type 1 pili and antigen 43 dependent-fashion, by preventing the binding of the adhesins to plastic surfaces. Another limonoid, obacunone was demonstrated to attenuate the Salmonella virulence by repressing Salmonella Pathogenicity Island 1 (SPI-1) in EnvZ/OmpR dependent mecahnism.
The seventh study showed that naringenin, among the flavonoids, was the most potent inhibitor of V. harveyi and E. coli O157:H7 cell-cell signaling. Furthermore, naringenin was found to repress the (SPI-1) in PstS-HilD dependent fashion in the eighth study. In conclusion, the current project identified several limonoids and flavonoids with cell-cell signaling inhibitory property in three bacterial species.
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Chang, Chia-wei, and 張家偉. "A Study of the Lexical Transfer in L2 Japanese Compound Words by Taiwanese Learners." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/12688334648244967957.
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碩士玄奘大學
應用外語學系碩士班
101
The purpose of this study is to investigate whether Chinese as first language learners (CFL) would transfer their lexical knowledge to second language (L2), Japanese while they read various meanings of Japanese compounds words. CFL have advantages over non Chinese background L2 Japanese learners when they learn Japanese compound words because majority of these words are identical with Chinese –Japanese cognates. That is, CFL can understand the meanings of such L2 words based on their L1 prior knowledge. However, the facts that not all Japanese compound words are perfect cognates is potentially a pitfall for CFL (Kato, 2000; Miura, 1983). Thus a question arises whether CFL can distinguish false cognates from those of perfect cognates. A lexical judgment task is employed to investigate whether CFL can transfer L1 semantic to four different types of compound words. The results indicate that, CFL had little difficulty to judge the meanings of positive cognates (good cognates) compound words, however include non-cognates and totally deceptive cognates confused the participants. Keyword: positive transfer, negative transfer,
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Liu, Ya-Ting, and 劉雅婷. "Biodistribution and pharmacokinetic study of new synthetic anti-tumor compounds, PK-L1, and its solid lipid nanoparticle formulation in mice." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/86064966491573323447.
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碩士高雄醫學大學
臨床藥學研究所碩士班
95
Abstract PK-L1（1-[4-(Furo[2,3-b]quinolin-4-ylamino)phenyl]ethanone） is a novel compound with anti-tumor activity. It was demonstrated that have direct disruption of tubulin polymerization followed by apoptosis in human prostate cancer PC-3 cell line. In the human cancer cell line, PK-L1 （a mean GI50 value of 0.025 ?嵱）also exhibited potent and board cytotoxicity. Through cancer chemotherapeutic agents are often administrated systemically in high concentration. Unfortunately, this system-wide application often has serious side effects. Base on this reason, specific-targeting tissue is an important for chemotherapy. In this study, we used high performance liquid chromatography to determine the drug content in blood and tissues of health ICR mice. A C18 250 mm×4mm column was used for the separation of analyte with a mobile phase consisting of 40% acetonitrile and 60% pH 3.0 of sodium 1-pentansulfonate solution at a flow rate of 1.0 mL/min. PK-L1 was detected by electrochemical detector at 1.0 V and 20 nA. Linear range of calibration curves was 10~2000 ng/mL, and the limit of detection (LOD) was 6 ng/mL. In order to targeting effect, the SLN formula containing Trimyristin、Gelucire 53/10、phosphatydylcholine，stearylamine and poloxamer188 was developed in this study. The biodistribution of PK-L1 in mice after single intravenous injection with PK-L1 solution and SLN formulation of 8.4 mg/kg were investigated. The tissue level of SLN formulation was higher than of the solution dosage form in lung, liver and spleen.
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Castro, Ana Mafalda Santos. "IN VITRO SCREENING ASSAY USING THE MURINE PRE-ADIPOCYTE CELL LINE 3T3-L1 TO STUDY ANTI-OBESOGENIC ACTIVITIES OF CYANOBACTERIAL COMPOUNDS." Master's thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/87330.
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Castro, Ana Mafalda Santos. "IN VITRO SCREENING ASSAY USING THE MURINE PRE-ADIPOCYTE CELL LINE 3T3-L1 TO STUDY ANTI-OBESOGENIC ACTIVITIES OF CYANOBACTERIAL COMPOUNDS." Dissertação, 2015. https://repositorio-aberto.up.pt/handle/10216/87330.
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