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61.
Katie M. Yocham Crystal Scott Kiyo Fujimoto Raquel Brown Emily Tanasse Julia T. Oxford Trevor J. Lujan David Estrada 《Advanced Engineering Materials》2018,20(9)
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Consistent, spatially and temporally complete reflectance time series are required for reliable terrestrial monitoring. The Moderate Resolution Imaging Spectroradiometer (MODIS), like other polar-orbiting wide field of view satellite sensors, can provide global observations on a nearly daily basis, but the sparseness of valid observations due to cloud, residual atmospheric effects, and sensor anomalies, may result in gaps in the derived reflectance time series. This paper presents an approach for the generation of temporally complete daily MODIS 500 m nadir view BRDF-adjusted reflectance (NBAR) time series. The research is illustrated and assessed quantitatively using two years of cloud and snow screened, daily MODIS Terra and Aqua reflectance data at four sites in Africa, and demonstrated for phenology monitoring using NBAR derived NDVI time series. The components of the approach include: 1) an outlier detection algorithm to remove residual anomalous daily observations undetected in the upstream processing, 2) the dynamic generation of NBAR time series on a daily basis when seven or more observations are available for a day under consideration over a 16-day period, and 3) the means to gap fill the NBAR time series where less than 7 observations are available. The MODIS Ross-Thick/Li-Sparse-Reciprocal BRDF model is used with a rolling approach whereby a 16-day BRDF inversion window is moved on a daily overlapping basis to provide more reliable outlier detection and daily NBAR. NBAR gap filling in periods of missing observations is investigated using static land cover specific archetype BRDF parameters and using BRDF parameters defined adaptively from the temporally closest 16-day periods with 7 or more observations. Scaling factor estimators using ordinary least squares (OLS) and median-based robust least squares regression are investigated, and the robust method is demonstrated to provide on average temporally more coherent gap filled NBAR values. For regions with persistent clouds, the utility of the adaptive NBAR gap filling method is demonstrated to be severely limited due to the decreased likelihood that the surface BRDF at each gap can be described reliably. The reliability of the NBAR gap filling methodology is evaluated statistically using a cross-validation approach. For the small number of study site considered, the adaptive method is shown to provide more accurate results than the archetype method when there are more than an average of ~ 4-5 observations per 16-day window, or when a gap day is on average less than about 30 days from a 16-day period with 7 or more observations. The resulting gap free daily NBAR time series and derived daily NBAR NDVI generated by the approach is shown to capture phenological variations in a coherent temporally consistent manner, suggesting that it is a fruitful avenue for future research and validation. 相似文献
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Stress-related growth following a variety of highly stressful experiences is receiving increased attention. However, one area that has not yet been addressed is the growth that therapists may experience in their own personal life through encounters with trauma and personal struggles and how this growth might carry forward to the work that they do with their clients in the practice of psychotherapy. In the present article, the authors describe stress-related growth and use it as a framework to examine the stressful experience and ultimate growth of a therapist dealing with a family member's emotional crises. Three areas of her growth as a therapist are examined: strengthened understanding of the therapeutic process from the client's viewpoint, additional strategies for approaching the change process, and increased empathy for parents and clients. The article concludes with recommendations for therapists experiencing personal struggles. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
66.
Miranda Antoinette Halsell; Griffin Crystal S.; Jenkins Tiffany A. 《Canadian Metallurgical Quarterly》2007,22(3):473
Reviews the book, Stategies for building multicultural competence in mental health and educational settings edited by M. G. Constantine and D. W. Sue (2005). Strategies for Building Multicultural Competence in Mental Health and Educational Settings is an excellent resource designed for mental health professionals who may lack knowledge and expertise in working with diverse clients. It provides hands-on strategies and suggestions in a variety of contexts, using the Multicultural Guidelines as a framework. This book is strongly recommended for clinicians working with culturally diverse populations. The Surgeon General's report Mental Health: Culture, Race and Ethnicity (U.S. Department of Health & Human Services, 2001) clearly demonstrates the disparity in the mental health care of racial and ethnic minorities as compared with Whites. This book is useful not only to novices exploring diversity but also to those who are already cross-culturally competent. The authors successfully apply the APA Multicultural Guidelines in clinical practice and educational, training, and organizational settings while providing specific strategies for clinicians. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
67.
This study has used the strategy of gene replacement to characterize the contribution of the adenovirus (Ad) capsid protein hexon to serotype definition. By replacing the Ad type 5 (Ad5) hexon gene with sequences from Ad2, we have changed the type specificity of the chimeric virus. The type-determining epitopes are primarily associated with loop 1 of hexon and, to a much lesser degree, with loop 2. In spite of the serotype distinctiveness of the chimeric hexon viruses, epitope similarity between the vectors resulted in a low level of cross-reactive neutralizing antibody, which in combination with activated cellular and innate arms of the immune system is sufficient to suppress gene transduction following readministration in vivo. 相似文献
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Measuring scenic quality at the urban fringe 总被引:1,自引:0,他引:1
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The relationships between two-photon absorption (TPA) effect and excited state intramolecular charge transfer (ICT) of p-substituted stilbene-type pyridinium salts have been investigated. Two-photon absorption cross section (δTPA) for all the compounds has been determined by open aperture Z-scanning technique, while two-photon pumped (TPP) up-converted lasing efficiencies (η) and optical limiting behavior have been measured by two-channel energy-meter, pumped by a mode locked Nd: YAG ps laser. Streak camera was used to record two-photon induced fluorescence and the fluorescence lifetimes. The experimental and calculated results have shown that the excited state larger in-tra-molecular charge transfer, in the excited state characterized by the charge density difference between the ground state ( S0) and the first excited state ( S1), has contributed to enhancing TPA cross section and may result in better optical limiting effect. And high TPP up-converted lasing efficiency is related to not only the δTP 相似文献
70.
David J. Lamberto Ben Cohen Julie Marencic Crystal Miranda Rositza Petrova Luis Sierra 《Chemical engineering science》2011,66(17):3868
Two distinct laboratory methods have been developed to assess the propensity of active pharmaceutical ingredients to undergo particle breakage during agitated drying operations. In the first method, mechanical stress is applied to particles by mechanical agitation of powders compressed under an applied normal force. For the second, particles experience stresses as they are carried within a pressurized gas stream. These methods are simple, relatively compound-sparing, and are used to rank materials according to a quantitative breakage classification scale as hard, medium, or easy to break. Based on the results obtained using these methods at laboratory scale, recommendations and precautions for processing at larger scale are made. In this paper, these methods are described in detail, and the results, obtained for several pharmaceutical compounds, are presented. 相似文献