Halley's spin state determined

Since VEGA and GIOTTO flybys of comet Halley, there was a rising controversy about the nature of the spin state of its nucleus. The problem was resolved by M. J. S. Belton et al., who found a spin state that simultaneously satisfies the VEGA and GIOTTO imaging data and a wide range of ground-based data. The total spin is not fixed in the nucleus but is inclined to the total angular momentum vector at an average angle of 21.4 deg and precesses around it with an average period of 3.69 days

Io's atmosphere detected by ground-based microwave spectroscopy

Io's corona and extended atmosphere, i.e., the plasma torus and neutral Na and K clouds, were the subject of intensive ground-based studies. E. Lellouch et al. not only detected but also fully resolved the profiles of two pure rotational lines of SO2. The lines were found in emission showing that early theoretical predictions for a thermally inverted atmospheric structure were correct

Low cost missions to explore the diversity of near Earth objects

We propose a series of low-cost flyby missions to perform a reconnaissance of near-Earth cometary nuclei and asteroids. The primary scientific goal is to study the physical and chemical diversity in these objects. The mission concept is based on the Pegasus launch vehicle. Mission costs, inclusive of launch, development, mission operations, and analysis are expected to be near $50 M per mission. Launch opportunities occur in all years. The benefits of this reconnaissance to society are stressed

Experimental study of a generic high-speed civil transport

An experimental study of generic high-speed civil transport was conducted in the NASA Langley 8-ft Transonic Pressure Tunnel. The data base was obtained for the purpose of assessing the accuracy of various levels of computational analysis. Two models differing only in wingtip geometry were tested with and without flow-through nacelles. The baseline model has a curved or crescent wingtip shape, while the second model has a more conventional straight wingtip shape. The study was conducted at Mach numbers from 0.30 to 1.19. Force data were obtained on both the straight wingtip model and the curved wingtip model. Only the curved wingtip model was instrumented for measuring pressures. Selected longitudinal, lateral, and directional data are presented for both models. Selected pressure distributions for the curved wingtip model are also presented

International workshop on Time-Variable Phenomena in the Jovian System

Many of the scientifically interesting phenomena that occur in the Jovian system are strongly time variable. Some are episodic (e.g., Io volcanism); some are periodic (wave transport in Jupiters atmosphere); and some are exceedingly complex (magnetosphere - Io - Torus-Auroral interactions) and possibly unstable. To investigate this class of phenomena utilizing Voyager data and, in the future, Galileo results, a coherent program of ground based and earth-orbital observations, and of theory that spans the time between the missions, is required. To stimulate and help define the basis of such a scientific program researchers organized an International Workshop on the subject with the intent of publishing the proceedings which would represent the state of knowledge in 1987

Access to Mental Healthcare and Help-seeking Behaviors among African American Women with Depressive Symptoms in a Community-based Primary Healthcare Center

Mental illness is a significant contributor to the global burden of disease. As public health practitioners, we must generate more than sufficient knowledge about mental health and illness in order to identify risk factors, increase awareness, improve treatment, eliminate the overall disparity associated with mental illness, and improve access to care to all affected, including those disproportionally affected by mental illness. Over time, there has been an overall lack of sufficient research studies on depression among African American women. As research in this area grows, it is critical to examine the underlying causative factors that are correlated with this disease and this population in order to provide better treatment options and a global understanding. This project will examine and analyze data obtained from the study assessment as it relates to psychosocial factors as reported by the study participants and generate a conclusion based on these findings. Additionally, this project will look to determine the help‐seeking behaviors of these women with access to a primary care physician and/or clinic. Overall, findings from this thesis project will provide an understanding of the specific psychosocial variables affecting African American women with depression and depressive symptoms, as well as provide an understanding of the help‐seeking behaviors of African American women, and contribute to the improvement of research in mental health in the United States

Fish seed production in ricefields: participatory training and extension manual

Seed (aquaculture), Rice field aquaculture, Rice fields, Manuals Oreochromis niloticus

Galileo-related ground-based observations of the Jovian System

The scientific objectives are to make millimeter observations of SO2 and other neutral molecules in Io's atmosphere and to conduct a program of observational and interpretive studies of the Jovian system in connection with the Galileo mission

Reduction and analysis of photometric data on Comet Halley

The discovery that periodic variations in the brightness of Comet Halley were characterized by two unrelated frequencies implies that the nucleus is in a complex state of rotation. It either nutates as a result of the random addition of small torque perturbations accumulated over many perihelion passages, or the jet activity torques are so strong that it precesses wildly at each perihelion passage. To diagnose the state of nuclear rotation, researchers began a program to acquire photometric time series of the comet as it recedes from the sun. The intention is to observe the decay of the comet's atmosphere and then, when it is unemcumbered by the light of the coma, follow the light variation of the nucleus itself. The latter will be compared with preperihelion time series and the orientation of the nucleus at the time of Vega and Giotto flybys and an accurate rotational ephemeris constructed. Halley was observed on 38 nights during 1987 and approximately 21 nights in 1988. The comet moved from 5 AU to 8.5 AU during this time. The brightness of the coma was found to rapidly decrease in 1988 as the coma and cometary activity collapses. The magnitude in April 1988 was 19 mag (visual) and it is predicted that the nucleus itself will be the major contributor to the brightness in the 1988 and 1989 season