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425 results on '"Yang, X. B."'

54. NUMERICAL SIMULATION OF THE OBLIQUE WATER ENTRY OF WEDGES WITH VORTEX SHEDDING.

Author

Yang, X. B. and Xu, G. D.

Subjects
*VORTEX shedding, *HYDRODYNAMICS, *NAVIER-Stokes equations
Abstract

The hydrodynamic problem of the water entry of wedges with oblique velocity has been investigated numerically. The simulations of the interaction of the wedge and initial calm surface are carried out by solving the Reynolds-averaged Navier-Stokes equations (RANS). The overset mesh technique is introduced and the air-water interface is tracked using the method of Volume of Fluid (VOF). The water entries of wedges with various deadrise angles at different oblique velocities are simulated. A noticeable vortex flow and low pressure area on the leeward side of the wedge have been observed. The evolution of vortex and the pressure distribution over the wedge surface are analysed. The local vortex flow affects the local hydrodynamic pressure significantly. [ABSTRACT FROM AUTHOR]

Published
2018
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55. Importance of alkyl chain-length on the self-assembly of new Ni(qdt) 2 complexes and charge transport properties

Author

Yang, X.-B., Zhou, L., Huang, L.-B., Xu, J.-J., Zhou, Y., Han, S.-T., Xu, Z.-X., Lau, V.C.Y., Hon-Wah Lam, M., Wong, W.-Y., and Roy, V.A.L.

Abstract

A series of ionic complexes composed with ([Ni(qdt)2]2−) and alkyl substituted asymmetric viologen derivatives (AV+) as cations have been synthesized and characterized. A slight change in the length of the alkyl chain of AV+ alters the cation–anion packing and leads to different charge transport properties of these complexes. Here, we establish a structure–property relationship of Ni(qdt)2 complexes by structurally modifying the cations.

Published
2013

56. Expression of nitric oxide synthase in the retina of monocular deprivation amblyopia rats.

Author

WANG, Q.-M., ZHAO, X.-Y., WANG, Z., and YANG, X.-B.

Abstract

OBJECTIVE: Amblyopia or lazy eye is a common visual problem affecting children that cannot correct with lenses. Nitric oxide synthase (NOS) is a critical enzyme that regulates the activity of nitric oxide (NO), a key signaling molecule with multiple roles in many tissues. Among its many activities, NOS has been proposed to be required for normal eye development and altered NOS expression can lead to perturbations in eye development and vision. MATERIALS AND METHODS: To examine the potential role of neuronal NOS (nNOS) in vision loss, we generated a model of monocular deprivation amblyopia in rats. After suturing one eye, we examined several parameters of neural activity and nNOS expression in the retina 7, 14 and 28 days later. RESULTS: We found the rapid and progressive loss of neural activity in the retina of sutured eyes compared to non-treated and control eyes. The sutured eyes also showed decreased expression of nNOS at the protein and mRNA levels, indicating a strong correlation between nNOS expression and retina activity. CONCLUSIONS: These data suggest a potential role for nNOS activity in vision loss, opening potential avenues for therapeutic intervention. [ABSTRACT FROM AUTHOR]

Published
2018

60. Models and applications for risk assessment and prediction of Asian soybean rust epidemics

Author

DEL PONTE, E. M., GODOY, C. V., CANTERI, M. G., REIS, E. M., and YANG, X. B.

Subjects
Soybean
Abstract

Asian rust of soybean [Glycine max (L.) Merril] is one of the most important fungal diseases of this crop worldwide. The recent introduction of Phakopsora pachyrhizi Syd. & P. Syd in the Americas represents a major threat to soybean production in the main growing regions, and significant losses have already been reported. P. pachyrhizi is extremely aggressive under favorable weather conditions, causing rapid plant defoliation. Epidemiological studies, under both controlled and natural environmental conditions, have been done for several decades with the aim of elucidating factors that affect the disease cycle as a basis for disease modeling. The recent spread of Asian soybean rust to major production regions in the world has promoted new development, testing and application of mathematical models to assess the risk and predict the disease. These efforts have included the integration of new data, epidemiological knowledge, statistical methods, and advances in computer simulation to develop models and systems with different spatial and temporal scales, objectives and audience. In this review, we present a comprehensive discussion on the models and systems that have been tested to predict and assess the risk of Asian soybean rust. Limitations, uncertainties and challenges for modelers are also discussed. Made available in DSpace on 2011-12-14T00:01:33Z (GMT). No. of bitstreams: 1 27131.pdf: 399137 bytes, checksum: d562db90076361fa906aa29fc89de7c2 (MD5) Previous issue date: 2007-04-04

Published
2006

62. A Coordinated Effort to Manage Soybean Rust in North America: A Success Story in Soybean Disease Monitoring

Author

Sikora, E. J., primary, Allen, T. W., additional, Wise, K. A., additional, Bergstrom, G., additional, Bradley, C. A., additional, Bond, J., additional, Brown-Rytlewski, D., additional, Chilvers, M., additional, Damicone, J., additional, DeWolf, E., additional, Dorrance, A., additional, Dufault, N., additional, Esker, P., additional, Faske, T. R., additional, Giesler, L., additional, Goldberg, N., additional, Golod, J., additional, Gómez, I. R. G., additional, Grau, C., additional, Grybauskas, A., additional, Franc, G., additional, Hammerschmidt, R., additional, Hartman, G. L., additional, Henn, R. A., additional, Hershman, D., additional, Hollier, C., additional, Isakeit, T., additional, Isard, S., additional, Jacobsen, B., additional, Jardine, D., additional, Kemerait, R., additional, Koenning, S., additional, Langham, M., additional, Malvick, D., additional, Markell, S., additional, Marois, J. J., additional, Monfort, S., additional, Mueller, D., additional, Mueller, J., additional, Mulrooney, R., additional, Newman, M., additional, Osborne, L., additional, Padgett, G. B., additional, Ruden, B. E., additional, Rupe, J., additional, Schneider, R., additional, Schwartz, H., additional, Shaner, G., additional, Singh, S., additional, Stromberg, E., additional, Sweets, L., additional, Tenuta, A., additional, Vaiciunas, S., additional, Yang, X. B., additional, Young-Kelly, H., additional, and Zidek, J., additional

Published
2014
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78. Soybean Sudden Death Syndrome Species Diversity Within North and South America Revealed by Multilocus Genotyping

Author

O'Donnell, Kerry, primary, Sink, Stacy, additional, Scandiani, María Mercedes, additional, Luque, Alicia, additional, Colletto, Analía, additional, Biasoli, Marisa, additional, Lenzi, Lisandro, additional, Salas, Graciela, additional, González, Victoria, additional, Ploper, Leonardo Daniel, additional, Formento, Norma, additional, Pioli, Rosanna N., additional, Aoki, Takayuki, additional, Yang, X. B., additional, and Sarver, Brice A. J., additional

Published
2010
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98. Comparative Biology and Life Tables of "Candidatus Liberibacter Solanacearum"-Infected and -Free Bactericera Cockerelli (Hemiptera: Triozidae) on Potato and Silverleaf Nightshade.

Author

THINAKARAN, J., YANG, X.-B., MUNYANEZA, J. E., RUSH, C. M., and HENNE, D. C.

Subjects
*LIFE tables, *COMPARATIVE biology, *HEMIPTERA, *PARATRIOZA cockerelli, *POTATO diseases & pests
Abstract

The potato psyllid, Bactericera cockerelli (Sulc), vectors the pathogen "Canclidatus Liberibacter solanacearum" (Lso), causal agent of zebra chip disease of potato. Several cultivated and wild plants are reported to serve as alternate hosts for B. cockerelli and Lso, including silverleaf nightshade (SLN), a wild solanaceous woody perennial weed that occurs throughout Texas. Experiments were conducted in the laboratory to compare performance of Lso-infected and Lso-free B. cockerelli on SLN and potato. Results showed that host plants and Lso-infection significantly influenced the performance of B. cockerelli. Egg incubation and nymphal development of Lso-infected and Lso-free immatures were prolonged on SLN compared with potato indicating a host effect. Generally, Lso-infected B. cockerelli immatures developed faster on both SLN and potato, although significantly more Lso-free nymphs survived than nymphs that harbored the pathogen. Lso-free adults also lived longer and laid more eggs on potato than SLN. According to life table estimates, intrinsic and finite rates of increase of Lso-infected B. cockerelli were not significantly different from Lso-free individuals on potato and SLN. Analysis of the two factors revealed significant interaction effects between host and Lso and that development and reproduction of B. cockerelli is a function of both Lso-infection and host on which it fed. Results of this study suggests that Lso does not have a negative effect in the overall performance of B. cockerelli on both hosts and also demonstrated SLN to be an important alternative host that supports survival of Lsoinfected and Lso-free B. cockerelli populations. [ABSTRACT FROM AUTHOR]

Published
2015
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