Готові списки джерел за темами / Ba14

Добірка наукової літератури з теми "Ba14"

Автор: Grafiati

Опубліковано: 27 липня 2024

Оновлено: 28 липня 2024

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Статті в журналах з теми "Ba14"

Kareta, Theodore, Vishnu Reddy, Juan A. Sanchez, and Walter M. Harris. "Near-infrared Spectroscopy of the Nucleus of Low-activity Comet P/2016 BA₁₄ during Its 2016 Close Approach." Planetary Science Journal 3, no. 5 (May 1, 2022): 105. http://dx.doi.org/10.3847/psj/ac63cb.

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Abstract The near-Earth comet P/2016 BA14 (PanSTARRS) is a slow-rotating, nearly dormant object, a likely dynamical twin of 252P/LINEAR, and was recently shown to have a mid-infrared spectrum very dissimilar to other comets. Comet BA14 was also recently selected as one of the backup targets for the ESA’s Comet Interceptor, so a clearer understanding of BA14's modern properties would not just improve our understanding of how comets go dormant but could also aid in planning for a potential spacecraft visit. We present observations of BA14 during its 2016 Earth close approach taken with the NASA Infrared Telescope Facility on two dates, both of which are consistent with direct observations of its nucleus. The reflectance spectrum of BA14 is similar to 67P/Churyumov–Gerasimenko, albeit highly phase-reddened. Thermal emission contaminates the reflectance spectrum at longer wavelengths, which we correct with a new Markov Chain Monte Carlo thermal modeling code. The models suggest that BA14's visible geometric albedo is p V = 0.01–0.03, consistent with radar observations; its beaming parameter is typical for NEOs observed in its geometry; and its reflectance spectrum is red and linear throughout the H and K bands. It appears very much like a “normal” comet nucleus despite its mid-infrared oddities. A slow loss of fine grains as the object’s activity diminished might help to reconcile some of the lines of evidence, and we discuss other possibilities. A spacecraft flyby past BA14 could get closer to the nucleus than with a more active target, and we highlight some science questions that could be addressed with a visit to a (nearly) dormant comet.

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Zheng, Jinlong, Siyun Shu, Bin Wang, Xiangyang Tian, Xinmin Bao, Yongming Wu, Zengqiang Zhang, Xiangyang Cao, and Lin Ma. "Encoding and Recognition Processing of Chinese Characters: A Functional Magnetic Resonance Imaging Study." BioMed Research International 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/5983671.

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This study aimed to investigate the conceptual memory processes that underlie encoding and recognition processing of Chinese characters. Healthy participants (n=14) performed a semantic-relatedness paradigm using categorically related logogram pairs from four different categories (fruit, animal, tool, and clothing). During intentional encoding, subjects were instructed to make semantic judgments and select category-correlated features to bind and memorize logogram pairs. During recognition, subjects were asked to recognize the memorized items. The MATLAB software and spatial clustering analysis were used for image data processing. Compared with baseline, encoding mainly activated BA13, with significant effects in BA6/8/9/46/45/47, BA24, BA7/39/40, BA37/20, and BA18/19; meanwhile, recognition mainly activated BA6/8/9/10/13/45/46/47, BA31, BA7/40, and BA18/19. Compared with recognition, encoding activated BA18/19/37/20/36 with a peak activation area in BA18. Compared with encoding, recognition significantly activated BA7, BA31/32, and BA10. In conclusion, distributed networks of discrete cortical regions with distinct roles are active during semantic processing of logograms. The ventral occipitotemporal and inferior frontal regions display increased levels of encoding-related activity. The dorsal medial brain regions, including the superior frontal gyrus and occipitoparietal regions, are associated with recognition-related activity.

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Dalimunthe, Cici Indriani, Radite Tistama, and Elia Wike Wijayanti Wijaya. "UJI BAKTERI ANTAGONIS UNTUK MENGENDALIKAN PENYAKIT MOULDY ROT (Ceratocystis fimbriata) DI LABORATORIUM." Jurnal Agro Estate 5, no. 1 (June 14, 2021): 39–48. http://dx.doi.org/10.47199/jae.v5i1.78.

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Ceratocystis fimbriata menyebabkan penyakit pada bidang sadap tanaman karet (Hevea brasiliensis), yang menyebabkan jamur abu-abu atau busuk pada panel sadap yang mempengaruhi hasil lateks. Tujuan penelitian adalah untuk memperoleh bakteri antagonis yang dapat menghambat pertumbuhan penyakit mouldy rot (Ceratocystis fimbriata) pada skala laboratorium. Penelitian ini menggunakan rancangan acak lengkap non-faktorial yang terdiri dari sepuluh perlakuan dan tiga ulangan. Bakteri Antagonis yang digunakan adalah BA1, BA3, BA4, BA5, BA6, BA7, BA8, BA9, dan BA10. Isolat bakteri diambil dari hasil isolasi kulit yang dipulihkan dan kulit tanaman karet perawan. Hasil penelitian menunjukkan bahwa isolat bakteri yang dapat menghambat pertumbuhan patogen sekitar > 80% adalah BA1, BA4, BA5, BA9, dan BA1. Isolat BA2, BA3, BA6, BA7, dan BA8 dapat menghambat pertumbuhan patogen jamur sekitar 40% hingga <80%. Isolat BA10 memiliki persentase penghambatan tinggi sekitar 92,84%. Pengujian lebih lanjut perlu dilakukan pada skala lapangan untuk menentukan efektivitasnya sebagai kontrol biologis penyakit mouldy rot.

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Ootsubo, Takafumi, Hideyo Kawakita, and Yoshiharu Shinnaka. "Mid-infrared observations of the nucleus of Comet P/2016 BA14 (PANSTARRS)." Icarus 363 (July 2021): 114425. http://dx.doi.org/10.1016/j.icarus.2021.114425.

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Michalewicz, Joseph, Evelyn Hsu, Jeffrey J. Larson, and Allen W. Nicholson. "Physical map and genetic early region of the T7-related coliphage, BA14." Gene 98, no. 1 (February 1991): 89–93. http://dx.doi.org/10.1016/0378-1119(91)90108-n.

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Ábrego, Leyda E., Adriana Delfraro, Danilo Franco, Juan Castillo, Marlene Castillo, Brechla Moreno, Sandra López-Vergès, Juan M. Pascale, and Juan Arbiza. "Genetic variability of human respiratory syncytial virus group B in Panama reveals a novel genotype BA14." Journal of Medical Virology 89, no. 10 (May 23, 2017): 1734–42. http://dx.doi.org/10.1002/jmv.24838.

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Ali, Siti Atiyah, Tahamina Begum, Faruque Reza, Nor Asyikin Fadzil, and Faiz Mustafar. "sLORETA Source Localisation of Visual Mismatch Negativity in Dyslexic Children During Malay Orthographical Lexicon Stimulations." Malaysian Journal of Medical Sciences 27, no. 5 (October 27, 2020): 36–42. http://dx.doi.org/10.21315/mjms2020.27.5.4.

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Background: While there are studies on visual lexical processing in other languages among dyslexics, no studies were done in the Malay language. The origin of visual lexical processing might be different in the Malay language. We aimed to detect the source localisation of visual mismatch negativity (vMMN) during Malay orthographic lexicon stimulations, employing an event-related potential (ERP) study. Methods: Twelve dyslexic and twelve non-dyslexic children participated in this study. They pushed button ‘1’ when they saw real (meaningful) Malay words and button ‘2’ for pseudowords (meaningless). The source localisation of vMMN was performed in the grand average waveform by applying the standardised low-resolution brain electromagnetic tomography (sLORETA) method using Net Station software. Results: Left occipital (BA17) and left temporal (BA37) lobes were activated during real words in the non-dyslexic and dyslexic children, respectively. During pseudowords, BA18 and BA17 areas of the left occipital lobe were activated in the non-dyslexic and dyslexic children, separately. vMMN sources were found at the left temporal (BA37) and right frontal (BA11) lobes in nondyslexic and dyslexic children, respectively. Conclusion: Right frontal lobe is the decision-making area where vMMN source was found in dyslexic children. We concluded that dyslexic children required the decision-making area to detect Malay real and pseudowords.

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Li, Jian-Yang, Michael S. P. Kelley, Nalin H. Samarasinha, Davide Farnocchia, Max J. Mutchler, Yanqiong Ren, Xiaoping Lu, David J. Tholen, Tim Lister, and Marco Micheli. "The Unusual Apparition of Comet 252P/2000 G1 (LINEAR) and Comparison with Comet P/2016 BA14(PanSTARRS)." Astronomical Journal 154, no. 4 (September 7, 2017): 136. http://dx.doi.org/10.3847/1538-3881/aa86ae.

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Sulyanova, Elena A., Denis N. Karimov, and Boris P. Sobolev. "Displacements in the Cationic Motif of Nonstoichiometric Fluorite Phases Ba1−xRxF2+x as a Result of the Formation of {Ba8[R6F68–69]} Clusters: III. Defect Cluster Structure of the Nonstoichiometric Phase Ba0.69La0.31F2.31 and Its Dependence on Heat Treatment." Crystals 11, no. 4 (April 20, 2021): 447. http://dx.doi.org/10.3390/cryst11040447.

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The defect structure of Ba0.69La0.31F2.31 single crystals in as-grown state and after annealing at 1173 K for 336 h was studied by X-ray diffraction analysis. Both crystals belong to the CaF2 structure type (sp. gr. Fm3¯m). They have vacancies in the main anion motif and interstitial fluorine anions in Wyckoff positions 48i and 4b. Relaxation (static displacement of some main anions to Wyckoff position 32f) is observed in the annealed crystal. It was established that annealing leads to a change in the type of displacement of the main anions in Wyckoff positions 8c from dynamic to static. Displacement of La3+ cations to Wyckoff position 32f is observed in both crystals. A model of the defect structure of Ba0.69La0.31F2.31 is proposed, according to which interstitial fluorine anions and La3+ cations are aggregated into [Ba14−nLanF64+n] clusters with the cuboctahedral anionic core formed by interstitial fluorine anions in Wyckoff positions 48i. Ba2+ cations are located in the cluster in the centers of the faces, and the La3+ cations are shifted by 0.24 Å from the vertices of the cluster along the three-fold axis towards the center of the cluster. The study establishes the relationship between the defect structure of crystals and their structurally sensitive properties, and to develop approaches to their management.

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Green, Benjamin, Katy Sorensen, Mary Phillips, Lisa Green, Rachel Watson, Adrienne McCallum, Sarah Brook, et al. "Complex Enterally Tube-Fed Community Patients Display Stable Tolerance, Improved Compliance and Better Achieve Energy and Protein Targets with a High-Energy, High-Protein Peptide-Based Enteral Tube Feed: Results from a Multi-Centre Pilot Study." Nutrients 12, no. 11 (November 18, 2020): 3538. http://dx.doi.org/10.3390/nu12113538.

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This pilot study evaluated a high-energy, high-protein, peptide-based, (medium-chain triglycerides) MCT-containing enteral tube feed (Nutrison Peptisorb Plus HEHP®, Nutricia Ltd., Trowbridge, BA14 0XQ, UK.) containing 1.5 kcal/mL and 7.5 g protein/100 mL. Fifteen community-based, enterally tube-fed adults (42 (SD 16.3) years) received the intervention feed daily for 28 days, with gastrointestinal tolerance, compliance and nutrient intake assessed at baseline and after the intervention period. Incidence and intensity of constipation (p = 0.496), nausea (p = 1.000), abdominal pain (p = 0.366) and bloating (p = 0.250) remained statistically unchanged, yet the incidence and intensity of diarrhoea improved significantly after receiving the intervention feed (Z = −2.271, p = 0.023). Compliance with the intervention feed was significantly greater compared to the patient’s baseline regimens (99% vs. 87%, p = 0.038). Compared to baseline, use of the intervention feed enabled patients to significantly increase total energy (1676 kcal/day (SD 449) to 1884 kcal/day (SD 537), p = 0.039) and protein intake (73 g/day (SD 17) to 89 g/day (SD 23), p = 0.001), allowing patients to better achieve energy (from 88% to 99%, p = 0.038) and protein (from 101% to 121%, p < 0.001) requirements. This pilot study demonstrates that a high-energy, high-protein, peptide-based, MCT-containing enteral tube feed maintains gastrointestinal tolerance and improves compliance, energy and protein intake in complex, enterally tube-fed, community-based adult patients, though more work is recommended to confirm this.

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Більше джерел

Дисертації з теми "Ba14"

Haynes, Richard. "The safety, tolerability and biochemical efficacy of extended release niacin and laropiprant in a major randomised clinical trial." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:01ba360a-fe6a-4a1a-ba14-48a2dcc3e0dd.

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Niacin has been in clinical use for over 50 years and was the first drug shown in a randomized trial to improve outcomes after MI, but substantial uncertainty remains about its efficacy and safety in the context of current standard medical therapy. This thesis explores the biochemical efficacy, tolerability and safety of extended release (ER) niacin/laropiprant in the large, randomized HPS2-THRIVE trial. Laropiprant is a prostaglandin D₂ receptor (DP1) antagonist which reduces the main adverse effect of niacin, namely “flushing” (an unpleasant cutaneous vasodilation) that makes a large trial of niacin practicable. ER niacin/laropiprant increases high density lipoprotein cholesterol (HDL-C) and apolipoprotein A1, and reduces low density lipoprotein cholesterol (LDL-C), apolipoprotein B, triglycerides and lipoprotein (a), consistent with previous studies of ER niacin. The reasons for stopping ER niacin/laropiprant reflected the known adverse effect profile of ER niacin, although unlike previous trials flushing was not the most frequent reason for stopping. Skin (pruritus and rash), gastrointestinal (nausea, pain and diarrhoea) and diabetes-related (hyperglycaemia) adverse events were the most common reasons for stopping ER niacin/laropiprant during 3.9 years’ follow-up. The analyses presented here identified three major previously unknown hazards of ER niacin. ER niacin/laropiprant increased the risk of statin-related myopathy almost five-fold, and this effect was greater among participants in China than Europe. ER niacin/laropiprant also increased the risk of bleeding (intracranial, gastrointestinal and other sites) and infection. Compared to placebo there was an absolute excess of 3.1% of serious adverse events (excluding cancer and major vascular events [MVEs]) among participants assigned ER niacin/laropiprant. ER niacin/laropiprant did not significantly reduce MVEs. These findings suggest that the use of niacin to reduce vascular risk should now be reconsidered.

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Lemoine, Marie-Pierre. "Coopération hommes-machines dans les procédés complexes : Modèles techniques et cognitifs pour le contrôle de trafic aérien." Valenciennes, 1998. https://ged.uphf.fr/nuxeo/site/esupversions/0821b192-7376-49d6-ba14-abc99ab0917a.

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La coopération est un point de rencontre de nombreuses disciplines. L'automatique décrit la coopération homme-machine au travers des outils d'assistance qu'elle est capable de développer. Les sciences humaines l'étudient au travers du comportement en milieu collectif. Cette thèse s'inscrit dans ce courant pluridisciplinaire et propose des critères et des moyens pour concevoir des systèmes d'aide qui répondent aux exigences tant humaines qu'industrielles. La répartition dynamique de taches entre un opérateur humain et un système d'aide, est une forme de coopération qui permet de couvrir une vaste plage de l'activité de supervision et de contrôle de procédés complexes. Ce mémoire en donne un exemple puisque la recherche s'applique au contrôle de trafic aérien. Compte tenu du foisonnement de définitions de la coopération, notre recherche tente de recentrer les points de vue éparses et propose une synthèse en fonction des notions de savoir-faire et de savoir-coopérer. La description des agents coopératifs en fonction de ces notions facilite la recherche des lacunes dans l'organisation des agents, ainsi que dans les tâches qui leur sont affectées. Une méthodologie d'évaluation est notamment présentée. Elle s'appuie sur un modèle cognitif de l'opérateur humain, et des critères de performance pondérés par des critères sur la qualité de la coopération. L'une des solutions proposées a l'issue des expérimentations est la conception d'un espace de travail commun. En plus d'une interface homme-machine, il est muni de modules intelligents qui facilitent ou automatisent l'identification des plans des agents coopératifs. Le système d'aide dispose alors de données précises et objectives pour piloter le répartiteur et l'allocateur de tâches. Un exemple d'espace de travail commun est présenté, il répond a l'augmentation du trafic aérien en apportant un soutien actif à la coopération entre les contrôleurs aériens, les pilotes, et les systèmes d'aide.

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Casellas-Français, Magali. "Mise en oeuvre, modélisation, optimisation et contrôle d'un procédé discontinu séquentiel (SBR) : application au traitement du carbone, de l'azote, du phosphore et des matières en suspension d'eaux résiduaires urbaines." Limoges, 2002. https://aurore.unilim.fr/theses/nxfile/default/c7b8b1be-7f59-4700-ba14-86cff384c513/blobholder:0/2002LIMO0035.pdf.

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L’optimisation du traitement des eaux urbaines nécessite la mise en place de procédés fiables et un contrôle rigoureux du fonctionnement. Dans ce cadre, le procédé discontinu séquentiel SBR (sequencing Batch reactor) consistant en la succession de phases de réaction, de décantation et de purge au cours du temps est étudié. A cette fin, une méthodologie de développement fondée sur l’exploitation de résultats de simulations mathématiques, d’expérimentations en laboratoire, d’extrapolation à pleine échelle, et de protocoles de contrôle simples mais robustes est présentée. Le simulateur de procédé de traitement de l’eau ( « Benchmark ») associe un modèle de traitement des eaux (ASM n°1 de HENZE et coll. , 1986) et un modèle de décantation (TACKACS et coll. , 1991). L’association de ces deux modèles permet de simuler le fonctionnement d’un système d’épuration à boues activées. Une étude bibliographique exhaustive a permis de dégager des scénarios de fonctionnement d’un SBR susceptibles d’aboutir au traitement du carbone, de l’azote, du phosphore et des MES contenus dans une eau usée urbaine. Les différents cycles sont testés afin de dégager deux procédures : un cycles long et un cycle court. L’utilisation du Benchmark, suite à une mise en place critique de procédures d’identification des variables d’entrée des modèles, est étendue à l’élaboration de différentes stratégies d’amélioration de l’élimination de l’azote. Cette étude, couplée à une étude expérimentale de la déphosphatation, a abouti à la définition d’un cycle de 24 heures, améliorant les cinétiques de dénitrification et mettant en exergue les problèmes liés à la variation temporelle de la charge d’entrée. Afin d’y remédier, une méthode de contrôle et de fiabilisation du fonctionnement, fondée sur l’utilisation conjointe de trois capteurs : pH, potentiel rédox, oxygène dissous, est présentée et mise en oeuvre à l’échelle semi-industrielle
Wastewater treatment optimization requires the installation of reliable processes and a control of operating conditions. In this context, discontinuous processes like SBR, working on the principle of alternating reaction, settling and purge phases is investigated. A development process methodology based on the use of mathematical simulations, lab scale experiments, full scale extrapolation and simple but robust control strategies is reported. The Benchmark of wastewater treatment associates a wastewater treatment model (ASM n°1 ofHENZE et al. , 1986) and a settling conditions model (TACKACS et al. , 1991). Combining both models allows for the simulation of an activated sludge process operation. An exhaustive bibliographic study could highlight different scenarios of SBR operations able to achieve carbon, nitrogen, phosphorus and total suspended solids removal. Different time delays were investigated in order to identify two particular operating conditions : short cycles and long cycles. The use of the Benchmark associated with a critical identification of incoming variables of the model, was extended to the development of strategies for nitrogen removal improvement. This study, combined with an experimental study of phosphorus removal allowed to define a 24 hours cycle, improving denitrification rates but also highlighting problems related to temporal variations of incoming load. In order to solve this problem, a special procedure , based on the use of three sensors : pH, ORP, dissolved oxygen, was investigated and full scale commissioned, in order to control with accuracy operating conditions

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Santelli, Claudio. "Accelerating multi-dimensional magnetic resonance imaging of blood flow and turbulence in the cardiovascular system." Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/accelerating-multidimensional-magnetic-resonance-imaging-of-blood-flow-and-turbulence-in-the-cardiovascular-system(8a415f79-2e07-48fd-ba14-13eab607da22).html.

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Disturbed hemodynamic conditions are often related to pathologies of the cardiovascular system. Phase‐contrast Magnetic Resonance Imaging (MRI) provides a non‐invasive technique for the assessment of time‐resolved blood velocity vector fields within arbitrary imaging volumes. Besides velocity vector field information, parameters related to turbulence can be calculated with advanced multi‐point velocity encoding schemes. However, long scan times are currently the main barrier for the acceptance of the method in a clinical setting. The following work presents data‐driven MRI reconstruction algorithms for undersampled measurements with the focus on accurate flow quantification and visualization. An extension of an auto‐calibrated parallel imaging reconstruction framework for arbitrary kspace trajectories is proposed. The exploitation of temporal correlations as present in timeresolved data demonstrates further advances of scan time reduction when assessing mean velocity and turbulent kinetic energy. While most prior knowledge imposed in advanced MR image reconstruction is designed to work on magnitude images or assumes smooth background phase behavior, dedicated provisions are required for image reconstruction of phase‐contrast MRI data. To this end, it is proposed to incorporate the divergence‐free condition of blood flow into a separate magnitude and phase reconstruction framework for improving the accuracy of image reconstruction of blood velocity vector fields. To address respiratory motion artifacts, retrospective non‐rigid respiratory motion correction incorporated into an iterative parallel imaging reconstruction algorithm is proposed. Furthermore, optimized k‐t sampling patterns are derived for combined parallel imaging‐ and compressed sensing‐based scan acceleration. Finally, the dynamic parallel imaging technique is applied to study blood flow and turbulence patterns in a relevant patient population with congenital heart disease.

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Rodrigues, João Elias Figueiredo Soares. "Ordenamento e propriedades dielétricas em microondas dos sistemas (Ba1-xSrx)3CaNb2O9 e (Ba1-yLay)3Ca1+yNb2-yO9." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-15092017-081825/.

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Materiais dielétricos para operação em microondas constituem um ponto importante para usos em sistemas de comunicação móvel/via satélite, incluindo sistemas de monitoramento terrestres, internet/telefonia para celulares, internet das coisas, além do interesse militar para elaboração de radares. Avanços importantes nesse setor tecnológico só foram outorgados, graças ao emprego ostensivo de ressoadores dielétricos (RDs). Esses dispositivos constituem cerâmicas óxidas com baixa perda dielétrica em microondas, com demanda para sua miniaturização. O sistema deverá possuir alta constante dielétrica nesse intervalo e o dispositivo deve ser termicamente estável, ou seja, suas propriedades dielétricas não se alterarão com a temperatura. A busca por materiais de alto desempenho resultou na descoberta das perovskitas ordenadas 1:1 e 1:2, com estequiometria A2BBO6 e A3BB2O9, respectivamente. Tais sistemas ordenam o sítio B, da perovskita ABO3, gerando o empilhamento dos planos cristalinos com B e B, intercalados e na direção [1 1 1]c. Os resultados da literatura mostram que o ordenamento possui papel fundamental na obtenção de ressoadores de baixa perda dielétrica. Ademais, poucos estudos reportam as propriedades dos sistemas contendo os cátions Ca e Nb, no sítio B. Portanto, essa tese dedicou-se à investigação das propriedades dielétricas do sistema Ba3CaNb2O9 e, posteriormente, a modificação desse com a substituição dos cátions Ba2+ por Sr2+ e La3+. As amostras foram preparadas pelo método de reação do estado sólido e, posteriormente, caracterizadas pela difração de raios X, espalhamento Raman, espectroscopia de impedância e desempenho em microondas, além de técnicas complementares como análise térmica, densidade por imersão e microscopia eletrônica de varredura. Os resultados demonstraram a coexistência dos domínios 1:1 e 1:2 no sistema Ba3CaNb2O9, sendo possível manipulá-los mediante condições da sinterização. Microestruturalmente, esses domínios são regiões no cristalito com diferentes ordens catiônicas e, assim, com propriedades cristalográficas e vibracionais diferentes. Pela impedância, notou-se que o ressoador Ba3CaNb2O9 tende a conduzir mais quando possui uma tendência para o domínio 1:1. Tal resultado foi confirmado em microondas, onde a redução da perda dielétrica foi correlacionada à diminuição do domínio 1:1 na estrutura cristalina dos ressoadores. Na solução sólida com Sr2+, uma transição da fase trigonal D3d3 para monoclínica C2h3 foi detectada nos pós-calcinados, sendo oriunda das inclinações octaédricas do sistema de Glazer a0b-b-. As cerâmicas desse sistema foram sinterizadas a 1500 °C por 26 h, cujo resultado ilustrou uma tendência à ordem 1:1 para x ≥ 0,30. No sistema com La3+, observou-se, além da coexistência, os monodomínios 1:1 e 1:2. O sistema com monodomínios 1:1, BaLaCaNbO6 (y = 0,50), evidenciou uma distorção monoclínica intrínseca. Esta distorção foi associada às inclinações octaédricas do sistema de Glazer a0b-b-, reduzindo a simetria da fase cúbica Oh5 para monoclínica C2h3. Por fim, o desempenho como ressoador dielétrico dos sistemas BaLaCaNbO6 e Ba3CaNb2O9 foi avaliado. O primeiro sistema mostrou os seguintes valores: permissividade relativa εg ∼ 26, Qu × fR ∼ 10.506 GHz e coeficiente τf ∼ -55 ppm.K-1. O segundo sistema revelou os dados: permissividade εg ∼ 43, Qu × fR ∼ 15.752 GHz e o coeficiente τf ∼ 278 ppm.K-1.
Dielectric materials for microwave applications play an important role in mobile and satellite communication systems, including terrestrial monitoring, internet/mobile devices, internet of things, as well as the military uses as the radar developments. Advances in this technological field were only possible due to the ostensive use of dielectric resonators (DRs). These devices constitute oxide ceramics with a low dielectric loss in microwave frequency. The system must have high dielectric constant and such a device must be thermally stable. The search for highperformance materials granted the discovery of 1:1 and 1:2 ordered perovskites, with general formula A2BBO6 and A3BB2O9, respectively. These systems depict the B-site ordering of ABO3 perovskite, inducing the crystalline planes stacking in the [1 1 1]c direction. The literature results showed that the ordering plays an essential role in the low loss ceramics. Moreover, few studies reported the features of the systems containing the Ca and Nb cations at the B-site. Therefore, our work drives the dielectric properties of the Ba3CaNb2O9 system and, then, the modification induced by Ba2+ substitution by Sr2+ and La3+. The samples were prepared by the conventional solid-state reaction method and probed by X-ray diffraction, Raman scattering, impedance spectroscopy and microwave performance, as well as other techniques such as thermal analysis, density measurement, and electron microscopy. Our findings elucidated the coexistence of 1:1 and 1:2 domains in Ba3CaNb2O9 ceramics, being possible to manipulate them by sintering conditions. Such an ordered domain denotes regions in the crystallites with different cationic order and with different crystallographic and vibrational behavior. By the impedance spectroscopy, it was observed that Ba3CaNb2O9 ceramics tend to conduct more when they present a tendency towards the 1:1 domains. The earlier result was also confirmed in microwave frequency, in which the dielectric loss decreasing was correlated to the decrease of the 1:1 domain in the crystal structure. In the strontium solid solution, a transition from the D3d3 trigonal phase to the C2h3 monoclinic one was noted in powder samples, being derived from octahedral tilting (a0b-b- Glazer system). In the lanthanum system, besides the coexistence, the monodomains 1:1 and 1:2 were observed. Otherwise, the 1:1 monodomain system, BaLaCaNbO6 (y = 0.50), exhibited an intrinsic monoclinic distortion. This distortion was ascribed to the octahedral tilting (a0b-b- Glazer system), lowering the crystal symmetry from Oh5 cubic phase to the C2h3 monoclinic phase. The dielectric resonator performances of the BaLaCaNbO6 and Ba3CaNb2O9 systems were evaluated. The first system showed the following values: permittivity εg ∼ 26, Qu × fR ∼ 10.506 GHz and coefficient τf ∼ -55 ppm.K-1. The second system exhibited the data: permittivity εg ∼ 43, Qu × fR ∼ 15.752 GHz and coefficient τf ∼ 278 ppm.K-1.

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Nogueira, Içamira Costa. "Fotoluminescência dos compostos (Ba1-xSrx)MoO4 sintetizados com diferentes solventes." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/715.

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Universidade Federal de Sao Carlos
The molybdates with scheelite-type tetragonal structure is a family of inorganic materials that has received considerable attention since the discovery of their luminescent properties, with emission in the visible spectral region. In this work, barium strontium molybdate crystals, (Ba1-xSrx)MoO4, with the compositions (x = 0, 0.25, 0.50, 0.75 and 1) were synthesized by co-precipitation method (drop by drop) in the presence of various solvents (water, 1,4-butanediol and diethylene glycol butyl ether) . The crystals obtained were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, M- Raman spectroscopy (M- Raman) and Fourier transform infrared (FT -IR) spectroscopy. The shape and size of the crystals were observed by means of field emission scanning electron microscopy (FE -SEM). The optical properties were investigated by ultraviolet-visible (UV Vis) absorption spectroscopy and photoluminescence (PL) measurements. The XRD patterns, M- Raman and FT- IR spectra showed that all crystals are monophasic with a scheelite-type tetragonal structure, belonging to the space group I41/a. The lattice parameters and atomic positions obtained by Rietveld refinement were employed to molding [BaO8], [SrO8] and [MoO4] clusters into the tetragonal lattice. The microscopy images showed that (Ba1-xSrx)MoO4 crystals with different concentrations (x) and synthesized with different solvents showed changes in size (micro and nanocrystals) and the shape (octahedron, flowers, balls and rods) crystals. Photoluminescent emission at room temperature in different regions of maximum intensity was assigned to different densities of intermediate electron levels (deep and shallow) located within the band gap as a consequence of the degree of order-disorder structural in the crystal lattice and defects on the surface of crystals. Finally, we discussed possible mechanisms to explain the behavior photoluminescent.
Os molibdatos com estrutura tetragonal tipo scheelita é uma família de materiais inorgânicos que tem recebido considerável atenção desde a descoberta de suas propriedades luminescentes, com emissões na região espectral do visível. Neste trabalho, cristais de molibdatos de bário e estrôncio, (Ba1-xSrx)MoO4, com as composições (x = 0; 0,25; 0,50; 0,75 e 1) foram sintetizados pelo método de co-precipitação (gota a gota) na presença de diversos solventes (água, 1,4-Butanodiol e dietilenoglicol butil éter). Os cristais obtidos foram estruturalmente caracterizados por difração de raios X (DRX), refinamento de Rietveld, espectroscopia M-Raman (M-Raman) e espectroscopia no infravermelho com transformada de Fourier (FT-IV). A forma e tamanho dos cristais foram observados por intermédio da microscopia eletrônica de varredura por emissão de campo (FE-SEM). As propriedades ópticas foram investigadas por espectroscopia de absorção no ultravioleta e visível (UV-Vis) e medidas de fotoluminescência (FL). Os padrões de DRX, os espectros de M-Raman e FT-IV mostraram que todos os cristais são monofásicos com estrutura tetragonal tipo scheelita, pertencentes ao grupo espacial I41/a. Os parâmetros de rede e posições atômicas obtidos pelo Refinamento de Rietveld foram empregados para modelar os clusters [BaO8], [SrO8] e [MoO4] dentro da rede cristalina tetragonal. As imagens de microscopia indicaram que os cristais de (Ba1-xSrx)MoO4 com diferentes concentrações (x) e sintetizados com diferentes solventes apresentou modificações no tamanho (micro e nanocristais) e na forma (octaedros, flores, bastões e esferas) dos cristais. As emissões fotoluminescentes a temperatura ambiente em diferentes regiões de intensidade máxima, foi atribuída a diferentes densidades de níveis eletrônicos intermediários (rasos e profundos) localizados dentro do band gap, como consequência do grau de ordem-desordem estrutural na rede cristalina e defeitos nas superfícies dos cristais. Finalmente, foram discutidos possíveis mecanismos para explicar o comportamento fotoluminescente.

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Carey, Joseph Vincent. "New bisphosphine ligands for asymmetric catalysis." Thesis, University of Oxford, 1991. http://ora.ox.ac.uk/objects/uuid:c1261e8d-baf4-476a-8954-f943588e1579.

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The success of homogeneous asymmetric catalysis has been attributed to the structure and stereochemistry of the coordinated ligand(s). The most effective ligands are C₂-symmetrical bisphosphines containing either a rigid chiral backbone linking two PPh₂ units or a bisphosphine, DIPAMP containing two chiral phosphine units linked by an achiral backbone. The synthesis of P-chiral ligands of this type has been severely hindered by the lack of a general synthetic route allowing the incorporation of phosphorus chirality without the need for separation of diastereomeric precursors or resolution of intermediate enantiomers. The objective of this work was to develop a general synthetic route to homochiral bulky arylphosphines with substantial flexibility in the groups at phosphorus and extend the approach to new P-chiral bisphosphines. In one approach, diastereomerically pure (2R, 4S, 5R)-2,5-diphenyl-3,4-dimethyl-1,3,2-oxazaphospholidine was prepared directly from PhPCl₂ using l-ephedrine as a chiral auxiliary. Stereospecific oxidation using Bu^tOOH gave the corresponding P-oxide which was shown to have R-stereochemistry at phosphorus by single-crystal X-ray diffraction studies. The compound reacted regiospecifically with ortho-anisylmagnesium bromide to afford the product formed by P-O bond cleavage with >96% d.e. and with retention of configuration at phosphorus as demonstrated by single-crystal X-ray diffraction studies. The l-ephedrine residue was replaced by O-methyl under acid-catalysis with inversion of configuration and with >95% e.e., the reaction was monitored by ¹H n.m.r. spectroscopy which gave t_1/2 of ca. 30 min. Attempts to incorporate para-fluorophenol using similar conditions led to the isolation of the pyrophosphinate in low yield. The OMe residue in the methyl (ortho-anisyl)phenylphosphinate was readily displaced by aliphatic Grignard reagents giving the corresponding phosphine oxides with inversion of configuration and with >95% e.e. Displacement of methoxy using aryl magnesium bromides showed similar enantioselectivity but in lower chemical yield, however the corresponding arylmagnesium chlorides were more efficient. In a second approach, diastereomerically pure (2R, 4S, 5R)-2-chloro-3,4-dimethyl-5-phenyl-1,3,2-oxazaphospholidine was prepared from PCl₃ and l-ephedrine. The compound underwent diastereoselective P-C1 cleavage with aryl Grignard and aryllithium reagents with net retention of configuration at phosphorus and with 90% d.e. Oxidation of the ortho-anisyl derivative afforded (2R, 4S, 5R)-2-(ortho-anisyl)-3,4-dimethyl-5-phenyl-1,3,2-oxazaphospholidine-2-oxide which was subsequently reacted with a range of bulky aryl Grignard reagents to afford the corresponding biarylphosphinamides with retention of configuration at phosphorus. Subsequent acid-catalysed methanolysis and displacement of the methoxy residue with PhMgCl afforded a range of bulky arylphosphine oxides with defined configuration at phosphorus with >95% e.e. as determined by ¹H n.m.r. methods. (S)-ortho-anisyl (meta-anisyl)phenylphosphine oxide underwent regiospecific ortho-lithiation on the meta-anisyl ring which on quenching with D₂O afforded the corresponding 2-deuteride in 80% yield. The 2-iodo analogue was also prepared although in low chemical purity and is a key precursor to new axially dissymmetric bisphosphines containing chiral phosphorus centres. Other approaches to P-chiral ferrocenyl ligands and biaryl ligands are also described and modifications for further development are implicated. An X-ray crystallographic study of six aryl-oxazaphospholidines is also presented and demonstrates the influence of the substituents at phosphorus in determining the conformation of the 1,3,2-oxazaphospholidine ring. A comparison with solution ¹H n.m.r. data showed, in some cases, good correlation between the P-O-C-H dihedral angle and the corresponding solid state torsion angle.

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Tzeng, Shih-jung. "From Hōnto Jin to Bensheng Ren : the origin and development of Taiwanese national consciousness : based on the examination of two diaries (1920-1955)." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:d095ffe8-3cdc-44ad-ba15-6b31d16d7464.

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This thesis represents a new attempt to use numerous volumes of mostly unpublished diaries, viewed as private forms of ego documents, as the main source for examining identity-centered issues. Using the private diaries of two Taiwanese intellectuals, Chen Wangcheng and Wu Xinrong, I have examined how Taiwanese national consciousness emerged and was reconstructed under the Japanese and Chinese Nationalist rule between 1920 and 1955. The examined cases suggest that a sense of Taiwanese national consciousness was created in the 1920s via an empirical construction, on the one hand, through the working of the politico-social networks, and via an abstract construction through the spread of print-capitalism on the other. Nevertheless, between 1937 and 1945, this multi-dimensional Taiwanese national consciousness was primarily reconstructed by the war development and mobilization, which were also reinforced by war propaganda, such as the discourse of the (greater) East Asian new order, rather than by the Kōminka cultural and religious policies. In other words, the sense of cohesion between the Taiwanese and Japanese was intensified, mainly because they shared a common fate in the cumulative process of warfare. In general, the islanders maintained a double identity as 'Taiwanese/Japanese', with the former being visibly tilted towards the latter during the war. In the early postwar period, the reconstructed Taiwanese national consciousness underwent a further reconstruction caused by the regime change from Japan to China in 1945 and the 2.28 Incident in 1947. The Taiwanese experienced a new imagination of Chinese national consciousness during the regime change, which was later challenged by the misrule of the Nationalist Chinese government and led to the emergence of the bensheng ren (native Taiwanese) consciousness. In nature, the increasing ethnic confrontation between the bensheng ren and waisheng ren (mainlanders), which centered around the conception of 'modernity vs. nationality', mainly resulted from their opposing 'Japanese experiences' and finally led to the outbreak of the 2.28 Incident, which in reverse provided a political focus to materialize the bensheng ren (vs. waisheng ren) identity from outside. In addition, the emerging international Cold War environment enabled the creation of a de facto independent state based on Taiwan-size governance, which internationally had an evident impact on shaping and reshaping the bensheng ren identity.

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Humphreys, Adam Richard Copeland. "Kenneth Waltz and the limits of explanatory theory in international relations." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:d21f41ff-ba18-453f-ba70-ecb7bf8ec3db.

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Kenneth Waltz's seminal work Theory of international politics (1979) conceptualizes international relations as a complex system in which the structure of the system and the interacting units (sovereign states) that comprise it are mutually affecting. Nevertheless, Waltz seeks to develop a nomothetic theory in which the structure of the international political system is isolated as an independent variable, state behaviour being the dependent variable. Waltz's explanatory strategy is therefore characterized by a deep tension: he treats structure as an independent variable whilst also arguing that structure and units are mutually affecting. Consequently, his systemic theory only generates partial explanations: it indicates how structure affects behaviour, but not how structure interacts with other variables to produce specific behavioural outcomes. This thesis draws on Waltz's theoretical writings, on Waltz's applications of his theory to empirical subjects in international relations (superpower relations during the Cold War, Soviet socialization into international society, and NATO's role after the Cold War), and on a wide range of theoretical literature. It explores the implications of the tension in Waltz's approach for explanatory theory in International Relations. It shows that Waltz's theory cannot ground many of his substantive arguments, that realists who attempt to improve Waltz's theory misunderstand the problems Waltz encounters, and that constructivists are unable to offer causal generalizations about complex systems. It concludes that explanatory theory in International Relations is currently poorly equipped to address complex systems in which structure and units are mutually affecting.

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Ridlehoover, Nathan. "The Sermon's Prayer : an examination of the intended purpose of the Matthean model prayer." Thesis, University of Bristol, 2018. http://hdl.handle.net/1983/76b3396f-6879-4c5d-ba54-c303e9bd2088.

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The Lord’s Prayer and Sermon on the Mount continue to be some of the most studied passages in the field of New Testament studies. Yet, the full import of these two passages has been missed, particularly as they are found together in Matthew’s Gospel. In Matthew’s Gospel, the Lord’s Prayer is in the centre of the Sermon on the Mount. The centrality of the Lord’s Prayer has been noted by commentators, but without clearly defining this centrality and without establishing the centrality’s intended purpose. In the following thesis, we set about the task of defining the Prayer’s centrality and showing how this centrality affects our reading of the Sermon on the Mount and subsequently, the Lord’s Prayer. To this end, we will argue that the Lord’s Prayer is structurally, lexically, and thematically central to the Sermon on the Mount and the means through which the disciple of Jesus is empowered to live out the kingdom righteousness defined by the Sermon on the Mount. In turn, the Sermon on the Mount clarifies what the answer to the petitions of the Lord’s Prayer might look like in the life of the disciple of Jesus.

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Hassan, Zainul Abidin. The normal state of Ba1-xKxBiO3 and the extended Hubbard model. [s.l.]: typescript, 1992.

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Museum of East Asian Art (Bath, England). Inaugural exhibition: 3 April 1993, Circus Lodge, 12 Bennett Street, Bath BA1 2QL England. [Bath, England]: The Museum, 1993.

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Jossey-Bass Handbook of Nonprofit Leadership and Management. Wiley & Sons, Incorporated, John, 2024.

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The Jossey-Bass Handbook of Nonprofit Leadership and Management. 3rd ed. San Francisco: Jossey-Bass, 2010.

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Jossey-Bass Handbook of Nonprofit Leadership and Management. Wiley & Sons, Incorporated, John, 2016.

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Jossey-Bass Handbook of Nonprofit Leadership and Management. Wiley & Sons, Incorporated, John, 2024.

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Jossey-Bass Handbook of Nonprofit Leadership and Management. Wiley & Sons, Incorporated, John, 2016.

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Jossey-Bass Handbook of Nonprofit Leadership and Management. Wiley & Sons, Limited, John, 2024.

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The Bar4 Spread. Mimosa Publishing, 2005.

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Beletra Almanako 44 (BA44 - Literaturo en Esperanto). Mondial, 2022.

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Частини книг з теми "Ba14"

Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk, et al. "Ba11(Ti0.11Nb0.89)9O33." In Landolt-Börnstein - Group III Condensed Matter, 55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_11.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk, et al. "Ba11(Nb0.25W0.5Re0.25)7O32." In Landolt-Börnstein - Group III Condensed Matter, 443. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_362.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, I. Savysyuk, and R. Zaremba. "Ba1-xRbxFe2As2." In Structure Types. Part 10: Space Groups (140) I4/mcm – (136) P42/mnm, 225. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19662-1_165.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, and I. Savysyuk. "Ba4(BaxPt1-x)Pt2O9." In Structure Types. Part 8: Space Groups (156) P3m1 – (148) R-3, 554. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-70892-6_336.

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Iyo, Akira, Atsuo Yamada, Yukio Oiji, Akihiko Takahashi, Akira Inoue, Hiroshi Watanabe, Hiromoto Uwe, Tunetaro Sakudo, and Keizo Murata. "Preparation, Pressure Effect, and Structural Phase Transition in Ba1−xKxBiO3 and Ba1−xRbxBiO3." In Advances in Superconductivity III, 113–16. Tokyo: Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68141-0_22.

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Suzuki, Seiji, Tetsuya Yamamoto, Hiroshi Suzuki, Kenichi Kawaguchi, Kazuhiko Takahashi, and Yorinobu Yoshisato. "Ba1-xKxBiO3/SrTiO3:Nb Oxide Heterojunctions." In Advances in Superconductivity IX, 1299–302. Tokyo: Springer Japan, 1997. http://dx.doi.org/10.1007/978-4-431-68473-2_152.

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Degani, M. H., Wei Jin, Rajiv K. Kalia, Priya Vashishta, and C. K. Loong. "Superconductivity in Ba1-XKxBiO3 Cubic Oxides." In Condensed Matter Theories, 253–68. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3352-8_24.

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Suzuki, Seiji, Tetsuya Yamamoto, Hiroshi Suzuki, Kenichi Kawaguchi, Kazuhiko Takahashi, and Yorinobu Yoshisato. "Ba1-xKxBiO3 Artificial Grain Boundary Junctions." In Advances in Superconductivity VIII, 1109–12. Tokyo: Springer Japan, 1996. http://dx.doi.org/10.1007/978-4-431-66871-8_250.

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Kamino, Maruo, Masahiro Iyori, Kazuhiko Takahashi, Yorinobu Yoshisato, and Shoichi Nakano. "Fabrication of Au/MgO/Ba1-xKxBiO3 Tunnel-Type Junctions Using the PMQ-Processed Ba1-xKxBiO3 Substrate." In Advances in Superconductivity IV, 903–6. Tokyo: Springer Japan, 1992. http://dx.doi.org/10.1007/978-4-431-68195-3_197.

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Muntasar, Abdualhafeed, and Georges Dénès. "The Ba1-xSnxCl1+yF1-y Solid Solution." In Mössbauer Spectroscopy in Materials Science, 39–48. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4548-0_4.

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Тези доповідей конференцій з теми "Ba14"

Anschau, Andréia, Andréia Anschau, Rebeca Becker Miranda, and Eliza Taborda Afonso. "AVALIAÇÃO DE RESISTÊNCIA A METAIS PESADOS PELA BACTÉRIA BACILLUS AERIUS BA04." In II Congresso Brasileiro de Biotecnologia On-line. Revista Multidisciplinar de Educação e Meio Ambiente, 2022. http://dx.doi.org/10.51189/conbiotec/13.

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Introdução: A contaminação do meio ambiente por metais pesados começou com o avanço e crescimento das atividades industriais, em função do descarte incorreto de resíduos de indústrias químicas, metalúrgicas e da agricultura, juntamente com a falta de tratamentos adequados de efluentes gerados pelas mesmas. Os metais pesados podem causar danos à saúde animal e humana devido ao acúmulo destes na água e no solo. A biorremediação por microrganismos vem se tornando uma ferramenta de grande potencial para a descontaminação dos ambientes contendo metais pesados. Objetivo: O objetivo deste estudo foi analisar a resistência da bactéria Bacillus Aerius BA04 frente a metais pesados. Material e métodos: Foram feitos nove cultivos em meio sólido usando a técnica de placa inclinada com meio Mueller Hinton acrescido de concentrações crescentes (até as concentrações máximas requeridas pela resolução 430/2011 do CONAMA) dos seguintes sais de metais pesados: acetato de chumbo II, sulfato de ferro II, sulfato de alumínio, sulfato de mercúrio, sulfato de zinco, sulfato de cobre, cloreto de cobalto e nitrato de cobalto. Os cultivos foram feitos em duplicate e conduzidos a 35 °C durante 7 dias. Resultados: A bactéria B. Aerius BA04 cresceu de forma homogênea na superfície de todas as placas com exceção do meio contendo sulfato de mercúrio no qual foi observada inibição do crescimento bacteriano, mesmo na região de baixa concentração do metal pesado. Conclusão: O estudo revelou que a bactéria B. Aerius BA04 apresenta resistência a altas concentrações dos metais tóxicos testados, caracterizando potencial para biorremediação de ambientes contaminados com diversos metais pesados, reduzindo a toxicidade desses metais.

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Gaur, N. K., Rasna Thakur, and Rajesh K. Thakur. "Thermodynamic properties of Ba1-xLaxCoO3." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946101.

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Ewbank, M. D., Pochi Yeh, R. R. Neurgaonkar, M. Khoshnevisan, and Jack Feinberg. "Stimulated light scattering in photorefractive crystals." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.mee2.

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Scattered light from a single laser beam incident on a photorefractive crystal is amplified in certain directions by two-wave mixing, producing beam fanning. A subset of the multitude of photorefractive-index gratings responsible for beam fanning is phase matched for conical diffraction. These cones of light appear with the same polarization as the incident beam and fanned light in Sr x Ba1 −x Nb2O6 and with the opposite polarization in BaTiO3. Measurement of the cone angle can provide accurate values of the birefringence of the crystal as a function of wavelength. Also, the intensity distribution of the stimulated light scattering reveals the optimal orientation and spacing of the photorefractive gratings for beam coupling, as will be shown for a cerium-doped sample of Sr x Ba1− x Nb2O6 with x = 0.75. Additionally, intense stimulated scattering, reflected back toward the incident beam by the crystal surfaces, can serve as the pumping beams for four-wave mixing to generate a self-pumped phase-conjugate replica of the incident beam in both BaTiO3 and Sr x Ba1− x Nb2O6.

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Aimei, Yu, and Li Qiang. "Study on Thermal Control Behavior by Using BaTiO3-Based PTC Materials With Room Temperature Curie Point." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-4014.

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Abstract Thermal management has become an important issue to be solved in the miniaturization and weight reduction of electronic equipment, especially in the aerospace field. The doped BaTiO3, as a self-regulating heating material, exhibits an attractive application perspective on the thermal control of electrical devices, resulting from its positive temperature coefficient (PTC) property. However, the Curie temperature of most of the doped BaTiO3 material at present is much higher than the operating temperature of the electrical equipment. On this basis, this paper focuses on the controlling of the Curie temperature and thermal control performance of the BaTiO3-based heating component. The polycrystalline Ba1-xSrxTiO3 was synthesized by solid solution reaction. The Curie temperature is tuned by the content of the strontium element, simultaneously the elements Y and Mn are doped to reduce the room temperature resistivity and improve the PTC effect. The X-ray diffraction demonstrates that the bulk phase of the Ba1-xSrxTiO3 generates in the presintering process, while the crystallization of composition has completed during the sintering. Importantly, the Curie temperature of doped Ba1-xSrxTiO3 for x = 0.3 with average particle size of 4.86 μm has shifted to around 38°C, beyond that exhibiting a 2.8-orders magnitude of PTCR jump. Results of the thermal control experiment show that, in contrast to the ordinary resistor heater, the heating element based on the BaTiO3 PTC material can achieve lower equilibrium temperature without any auxiliary control methods. Compared to the traditional thermal control system composed by the ordinary resistor, sensor and controller, the novel thermal control system based on PTC heating unit possesses simple structure, lightweight and excellent reliability.

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Ali, Asif, Sakshi Bansal, B. H. Reddy, and Ravi Shankar Singh. "Valence band study of Ba1-xSrxRuO3(x = 0,0.2)." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016609.

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Vazquez, Rene A., M. D. Ewbank, R. R. Neurgaonkar, and W. K. Cory. "Photorefractive properties of doped strontium barium niobate." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wl38.

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Photorefractive strontium barium niobate (Sr x Ba1- x Nb2O6 or SBN) is an attractive material for photorefractive applications because of its large r33 electrooptic coefficient. One attractive feature of the tungsten bronze structure of SBN is the large number of vacant lattice sites which can be occupied by dopants to provide a high density of photorefractive charge carriers.

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Yasukawa, K., M. Tanaka, and Y. Azuma. "Local structure analysis of Ca in Ba1-xCaxTiO3 ceramics." In 2008 17th IEEE International Symposium on the Applications of Ferroelectrics (ISAF). IEEE, 2008. http://dx.doi.org/10.1109/isaf.2008.4693885.

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Zakaria, Nur Shahirah, Rozana Aina Maulat Osman, and Mohd Sobri Idris. "The structural analysis of Ba1-xErxTiO3 (0≤ x ≤0.02)." In PROCEEDINGS OF 8TH INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS ENGINEERING & TECHNOLOGY (ICAMET 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0051865.

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Mollah, S., P. Mandal, T. Sk, S. Haldar, and Ajay Kumar Ghosh. "On the low temperature conduction mechanism of Ba1-xKxBiO3." In 3RD INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001179.

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Eremenko, Victor, Sergiy Feodosyev, Igor Gospodarev, Vladimir Ibulaev, R. William McCallum, Mikhailo Shvedun, and Valentyna Sirenko. "Negative Expansion Of Eu(Ba1−xLax)2Cu3O7−d Compounds." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2354798.

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Olver, Kimberley A. Fabrication of Barium Strontium Titanate (Ba1-xSrxTiO3) Films Used for Bio-inspired Infrared Detector Arrays. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada569361.

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