Microwave Radiometry at Frequencies From 500 to 1400 MHz: An Emerging Technology for Earth Observations.

Microwave radiometry has provided valuable spaceborne observations of Earth's geophysical properties for decades. The recent SMOS, Aquarius, and SMAP satellites have demonstrated the value of measurements at 1400 MHz for observing surface soil moisture, sea surface salinity, sea ice thickness, soil freeze/thaw state, and other geophysical variables. However, the information obtained is limited by penetration through the subsurface at 1400 MHz and by a reduced sensitivity to surface salinity in cold or wind-roughened waters. Recent airborne experiments have shown the potential of brightness temperature measurements from 500-1400 MHz to address these limitations by enabling sensing of soil moisture and sea ice thickness to greater depths, sensing of temperature deep within ice sheets, improved sensing of sea salinity in cold waters, and enhanced sensitivity to soil moisture under vegetation canopies. However, the absence of significant spectrum reserved for passive microwave measurements in the 500-1400 MHz band requires both an opportunistic sensing strategy and systems for reducing the impact of radio-frequency interference. Here, we summarize the potential advantages and applications of 500-1400 MHz microwave radiometry for Earth observation and review recent experiments and demonstrations of these concepts. We also describe the remaining questions and challenges to be addressed in advancing to future spaceborne operation of this technology along with recommendations for future research activities.

Design and Implementation of a Competency-Based Family Medicine Clerkship Curriculum.

BACKGROUND AND OBJECTIVES: Competency-based medical education (CBME) has been incorporated into graduate medical education accreditation and is being introduced in undergraduate medical education. Family medicine (FM) faculty at one institution developed a CBME FM clerkship to intentionally maintain the integrity of FM specialty-specific teaching during their institutional CBME curricular revision. METHODS: From the five FM domains (Access to Care, Continuity of Care, Comprehensive Care, Coordination of Care, and Contextual Care), 10 competencies and 23 FM educational activities (EAs) were defined. The set of EAs encompasses the wide scope of care available to FM clerkship students. Students complete four required EAs (preventive care, care transitions, chronic disease management, and acute care) and select four additional EAs matching their interests. EA selection frequency and course evaluations were assessed for the first cohort of learners (N=156; February 2016-July 2017). RESULTS: The most frequently selected EAs were: information coordination, procedures, and care of the family. The least selected were: patient e-communication, end-of-life care, and shared medical decision making. Student perceptions of the experience were strong prior to and after implementation. CONCLUSIONS: Having both required and selective EAs ensures a robust FM experience tailored to students' interests. The FM CBME curriculum allowed comparable clinical experiences despite variations in clinical sites and preceptor scope. Because of its breadth, FM is uniquely suited to address multiple competencies; this demonstrates the educational value of required FM clerkships to institutional leaders interested in implementing CBME curriculum. The CBME framework can provide a structure for more intentional student-clinic assignments based on EAs available at specific sites.

Seeking social support and postpartum depression: A pilot retrospective study of perceived changes.

Postpartum depression prevalence rates reach as high as 25% (Gavin, 2006). Negative effects on mothers and children are well established. Although low social support is an important predictor of perinatal depression (Leahy-Warren, McCarthy, and Corcoran, 2012), the value of peer group support remains equivocal and is examined in this pilot study. OBJECTIVE: Evaluations of interventions that focus on social support in real world settings for women experiencing PPD are lacking. In this pilot study we asked how perceived changes over time in three types of social support (significant other, family, and friends) in participants who sought help and attended postpartum peer support groups related to perceived changes in depression over the same time period. DESIGN: Retrospective design and Internet survey. SETTING: On-line survey referring to in-person participation in peer support groups for postpartum women. PARTICIPANTS: Fifty-seven women who attended postpartum peer support groups. METHODS: We investigated how self-reported changes over time in three types of social support (significant other, family, and friends) relate to perceived changes in depression over the same period. Parametric statistical analyses using SPSS 20.0 included Cronbach's alpha tests, paired sample t-tests and Pearson correlational analyses. FINDINGS: Significant improvement was reported. Pre-post change scores of perceived social support from friends and significant other were significantly correlated to pre-post depression change scores suggesting that social support contributed to a reduction in depression in this sample of postpartum women. IMPLICATIONS FOR PRACTICE: Seeking social support may contribute to a reduction in depression, particularly as it relates to perceived support from friends and significant other. Other variables not measured are discussed.

Development and Assessment of the SMAP Enhanced Passive Soil Moisture Product.

Launched in January 2015, the National Aeronautics and Space Administration (NASA) Soil Moisture Active Passive (SMAP) observatory was designed to provide frequent global mapping of high-resolution soil moisture and freeze-thaw state every two to three days using a radar and a radiometer operating at L-band frequencies. Despite a hardware mishap that rendered the radar inoperable shortly after launch, the radiometer continues to operate nominally, returning more than two years of science data that have helped to improve existing hydrological applications and foster new ones. Beginning in late 2016 the SMAP project launched a suite of new data products with the objective of recovering some high-resolution observation capability loss resulting from the radar malfunction. Among these new data products are the SMAP Enhanced Passive Soil Moisture Product that was released in December 2016, followed by the SMAP/Sentinel-1 Active-Passive Soil Moisture Product in April 2017. This article covers the development and assessment of the SMAP Level 2 Enhanced Passive Soil Moisture Product (L2_SM_P_E). The product distinguishes itself from the current SMAP Level 2 Passive Soil Moisture Product (L2_SM_P) in that the soil moisture retrieval is posted on a 9 km grid instead of a 36 km grid. This is made possible by first applying the Backus-Gilbert optimal interpolation technique to the antenna temperature (TA) data in the original SMAP Level 1B Brightness Temperature Product to take advantage of the overlapped radiometer footprints on orbit. The resulting interpolated TA data then go through various correction/calibration procedures to become the SMAP Level 1C Enhanced Brightness Temperature Product (LiC_TB_E). The LiC_TB_E product, posted on a 9 km grid, is then used as the primary input to the current operational SMAP baseline soil moisture retrieval algorithm to produce L2_SM_P_E as the final output. Images of the new product reveal enhanced visual features that are not apparent in the standard product. Based on in situ data from core validation sites and sparse networks representing different seasons and biomes all over the world, comparisons between L2_SM_P_E and in situ data were performed for the duration of April 1, 2015 - October 30, 2016. It was found that the performance of the enhanced 9 km L2_SM_P_E is equivalent to that of the standard 36 km L2_SM_P, attaining a retrieval uncertainty below 0.040 m3/m3 unbiased root-mean-square error (ubRMSE) and a correlation coefficient above 0.800. This assessment also affirmed that the Single Channel Algorithm using the V-polarized TB channel (SCA-V) delivered the best retrieval performance among the various algorithms implemented for L2_SM_P_E, a result similar to a previous assessment for L2_SM_P.

Combined Radar-Radiometer Surface Soil Moisture and Roughness Estimation.

A robust physics-based combined radar-radiometer, or Active-Passive, surface soil moisture and roughness estimation methodology is presented. Soil moisture and roughness retrieval is performed via optimization, i.e., minimization, of a joint objective function which constrains similar resolution radar and radiometer observations simultaneously. A data-driven and noise-dependent regularization term has also been developed to automatically regularize and balance corresponding radar and radiometer contributions to achieve optimal soil moisture retrievals. It is shown that in order to compensate for measurement and observation noise, as well as forward model inaccuracies, in combined radar-radiometer estimation surface roughness can be considered a free parameter. Extensive Monte-Carlo numerical simulations and assessment using field data have been performed to both evaluate the algorithm's performance and to demonstrate soil moisture estimation. Unbiased root mean squared errors (RMSE) range from 0.18 to 0.03 cm3/cm3 for two different land cover types of corn and soybean. In summary, in the context of soil moisture retrieval, the importance of consistent forward emission and scattering development is discussed and presented.

Surface Soil Moisture Retrieval Using the L-Band Synthetic Aperture Radar Onboard the Soil Moisture Active-Passive Satellite and Evaluation at Core Validation Sites.

This paper evaluates the retrieval of soil moisture in the top 5-cm layer at 3-km spatial resolution using L-band dual-copolarized Soil Moisture Active-Passive (SMAP) synthetic aperture radar (SAR) data that mapped the globe every three days from mid-April to early July, 2015. Surface soil moisture retrievals using radar observations have been challenging in the past due to complicating factors of surface roughness and vegetation scattering. Here, physically based forward models of radar scattering for individual vegetation types are inverted using a time-series approach to retrieve soil moisture while correcting for the effects of static roughness and dynamic vegetation. Compared with the past studies in homogeneous field scales, this paper performs a stringent test with the satellite data in the presence of terrain slope, subpixel heterogeneity, and vegetation growth. The retrieval process also addresses any deficiencies in the forward model by removing any time-averaged bias between model and observations and by adjusting the strength of vegetation contributions. The retrievals are assessed at 14 core validation sites representing a wide range of global soil and vegetation conditions over grass, pasture, shrub, woody savanna, corn, wheat, and soybean fields. The predictions of the forward models used agree with SMAP measurements to within 0.5 dB unbiased-root-mean-square error (ubRMSE) and -0.05 dB (bias) for both copolarizations. Soil moisture retrievals have an accuracy of 0.052 m3/m3 ubRMSE, -0.015 m3/m3 bias, and a correlation of 0.50, compared to in situ measurements, thus meeting the accuracy target of 0.06 m3/m3 ubRMSE. The successful retrieval demonstrates the feasibility of a physically based time series retrieval with L-band SAR data for characterizing soil moisture over diverse conditions of soil moisture, surface roughness, and vegetation.

SMAP L-Band Microwave Radiometer: Instrument Design and First Year on Orbit.

The Soil Moisture Active-Passive (SMAP) L-band microwave radiometer is a conical scanning instrument designed to measure soil moisture with 4% volumetric accuracy at 40-km spatial resolution. SMAP is NASA's first Earth Systematic Mission developed in response to its first Earth science decadal survey. Here, the design is reviewed and the results of its first year on orbit are presented. Unique features of the radiometer include a large 6-m rotating reflector, fully polarimetric radiometer receiver with internal calibration, and radio-frequency interference detection and filtering hardware. The radiometer electronics are thermally controlled to achieve good radiometric stability. Analyses of on-orbit results indicate that the electrical and thermal characteristics of the electronics and internal calibration sources are very stable and promote excellent gain stability. Radiometer NEDT < 1 K for 17-ms samples. The gain spectrum exhibits low noise at frequencies >1 MHz and 1/f noise rising at longer time scales fully captured by the internal calibration scheme. Results from sky observations and global swath imagery of all four Stokes antenna temperatures indicate that the instrument is operating as expected.

Medical student exposure to components of the patient-centered medical home during required ambulatory clerkship rotations: implications for education.

PURPOSE: To determine the extent to which third-year medical students are exposed to elements of the patient-centered medical home (PCMH) during required family medicine (FM) clerkships and how this exposure varies among a sample of medical schools. METHOD: In 2008, the authors conducted a cross-sectional survey of 104 ambulatory teaching practices that host required third-year FM clerkship students from nine U.S. medical schools. Descriptive statistics characterized learning settings and the status of PCMH features, and generalized linear mixed models examined variation among medical schools (as the 104 clinics were nested within nine medical schools). RESULTS: Participating schools captured data on 104 eligible clerkship sites (44%). These practices were primarily community-based, single-specialty clinics (n = 48; 46%), and more than half (n = 55; 53%) were part of integrated health systems. Electronic health records (EHRs) were in place in 60 (58%), and no significant difference existed in EHR use according to medical school, despite up to a 10-fold variation from school to school in other PCMH features. Among sites with EHRs, 8 (14%) did not allow access to medical students. Preceptor attitudes about how practice transformation and new information technology are affecting the quality of medical education differ widely from site to site. CONCLUSIONS: Primary care transformation toward the PCMH is already well under way in a national sample of FM teaching sites, and this transformation is having important effects on medical student education.

Abuse, neglect, and exploitation: considerations in aging with lifelong disabilities.

Persons with lifelong disabilities are newcomers to later life. Many are relatively high functioning, engaged, and happy members of their communities. Some are, and have been, victims of abuse, neglect, and exploitation. This article reviews factors that contribute to the current incomplete picture of the victimization of these older adults, reports the state of existing data on prevalence and treatments, and suggests initiatives to strengthen continued community living and improve both prevention and identification strategies.

L band brightness temperature observations over a corn canopy during the entire growth cycle.

During a field campaign covering the 2002 corn growing season, a dual polarized tower mounted L-band (1.4 GHz) radiometer (LRAD) provided brightness temperature (T(B)) measurements at preset intervals, incidence and azimuth angles. These radiometer measurements were supported by an extensive characterization of land surface variables including soil moisture, soil temperature, vegetation biomass, and surface roughness. In the period May 22 to August 30, ten days of radiometer and ground measurements are available for a corn canopy with a vegetation water content (W) range of 0.0 to 4.3 kg m(-2). Using this data set, the effects of corn vegetation on surface emissions are investigated by means of a semi-empirical radiative transfer model. Additionally, the impact of roughness on the surface emission is quantified using T(B) measurements over bare soil conditions. Subsequently, the estimated roughness parameters, ground measurements and horizontally (H)-polarized T(B) are employed to invert the H-polarized transmissivity (γ(h)) for the monitored corn growing season.

Aging in community nutrition, diet therapy, and nutrition and aging textbooks.

Using content analysis, this study evaluated the aging content and context in 11 nutrition sub-specialty textbooks: community nutrition (n = 3), diet therapy (n = 4), and nutrition and aging (n = 4). Pages with paragraphs on aging were identified in community nutrition and diet therapy textbooks, and 10% random samples of pages were evaluated in nutrition and aging textbooks. Paragraphs were assigned to one of four categories: gerontology, nutrition as primary, nutrition as secondary, or tertiary prevention. A total of 310 pages was qualitatively analyzed using NUD*IST 5 software and quantitatively with percentages. Only 7% of community nutrition and 2% of diet therapy pages were devoted to aging. There was little integration of aging beyond the chapters on aging. Community nutrition had the most gerontology (30%) and primary prevention (43%) content. Diet therapy and nutrition and aging had more secondary prevention (33% and 42%, respectively) and tertiary prevention (27% each) content. Some important databases and studies were absent. Of the 1,239 ageism words, 10% were positive, 53% neutral, and 36% negative. Photographs were generally positive. Women, but not minorities, reflected current older adult demographics. Future textbook editions should address aging more comprehensively and positively to better prepare dietitians for the job market. Recommendations for authors, course instructors, and publishers are given.

Adjustments and adaptations to indoor and outdoor environments: Continuity and change in young adult rhesus monkeys.

Optimal environments for captive primates are assumed to be those which simulate certain ecological features and elicit a wide range of species-typical behavior patterns. Outdoor environments are often thought to be more suitable than indoor environments in that they provide more space and potentially higher levels of stimulation. The purpose of this study was to compare the long-term behavioral responses of several groups of animals that had been reared identically during the first two years of life and then exposed to different environments. Two groups were moved into separate "enriched" indoor pens while one group was moved to an outdoor area covering approximately 5 acres. The monkeys were observed during the first year of life and again in these different environments between the ages of 6 and 10. Although behaviorally similar during the first year of life, monkeys developed different response patterns to indoor and outdoor environments. Contrary to commonly held views, indoor monkeys were not more aggressive, nor did they show higher levels of stereotypical behavior. Instead, indoor monkeys exhibited higher levels of grooming, sexual posturing, tactile/oral exploration, and passive visual behavior than their outdoor counterparts. These differences are consistent with the reconciliation model of de Waal. Individual monkeys also showed remarkable stability in certain traits over the 5-year period. © 1992 Wiley-Liss, Inc.