A white paper on dusty plasmas

Dusty plasmas is the name given to plasmas heavily laden with charged dust grains which together with the surrounding ions and electrons constitute a kind of plasma regime. This field of study is receiving increased attention because of the observation of dust during recent spacecraft missions to the planets and comets, together with the dawning recognition that the evolution of dusty plasma clouds in space may be quite different from that of nondusty clouds. Recent work in this field is reviewed and recommendations are made on the kind of research that is needed in the immediate future

Method and apparatus for determining satellite orientation utilizing spatial energy sources Patent

Sensing method and device for determining orientation of space vehicle or satellite by using particle trap

Modeling of spacecraft charging

Three types of modeling of spacecraft charging are discussed: statistical models, parametric models, and physical models. Local time dependence of circuit upset for DoD and communication satellites, and electron current to a sphere with an assumed Debye potential distribution are presented. Four regions were involved in spacecraft charging: (1) undisturbed plasma, (2) plasma sheath region, (3) spacecraft surface, and (4) spacecraft equivalent circuit

The physics and chemistry of dusty plasmas: A laboratory and theoretical investigation

Theoretical work on dusty plasmas was conducted in three areas: collective effects in a dusty plasma, the role of dusty plasmas in cometary atmospheres, and the role of dusty plasmas in planetary atmospheres (particularly in the ring systems of the giant planets). Laboratory investigations consisted of studies of dust/plasma interactions and stimulated molecular excitation and infrared emission by charged dust grains. Also included is a list of current publications

Active experiments in modifying spacecraft potential: Results from ATS-5 and ATS-6

The processing of data from onboard spacecraft instruments are described. The modification of spacecraft potentials is reviewed. Analysis of this data yielded the following results: (1) electron emission (E approximately 10 electron-volts) did not perturb the status of a satellite at low potential the absolute value of phi approximately 50 volts by more than 50 volts (the ATS 5 low energy limit), (2) emission of a low energy plasma (E approximatey 10 volts) does not change low potentials (the absolute value of phi approximately 5 volts) by more than a few volts (ATS 6 low energy resolution), (3) when ATS 6 entered eclipse in the presence of a high energy plasma (10 keV), the neutralizer suppressed any rise in the absolute value of phi (within a few volts resolution), (4) when the electron emitter on ATS 5 operated, it served to discharge negative potentials from thousands to hundreds of volts, and (5) when the neutralizer on ATS 6 was operated, it served to discharge kilovolt potentials to below 50 volts. Low altitude (100 - 300 km) experiments with KV electron beams are studied. Differential charging was eliminated by the operation of the main thruster on ATS 6 clamped on the spacecraft at -5 volts

Analysis of differential and active charging phenomena on ATS-5 and ATS-6

Spacecraft charging on the differential charging and artificial particle emission experiments on ATS 5 and ATS 6 were studied. Differential charging of spacecraft surfaces generated large electrostatic barriers to spacecraft generated electrons, from photoemission, secondary emission, and thermal emitters. The electron emitter could partially or totally discharge the satellite, but the mainframe recharged negatively in a few 10's of seconds. The time dependence of the charging behavior was explained by the relatively large capacitance for differential charging in comparison to the small spacecraft to space capacitance. A daylight charging event on ATS 6 was shown to have a charging behavior suggesting the dominance of differential charging on the absolute potential of the mainframe. Ion engine operations and plasma emission experiments on ATS 6 were shown to be an effective means of controlling the spacecraft potential in eclipse and sunlight. Elimination of barrier effects around the detectors and improving the quality of the particle data are discussed

Claim your online scholarly presence: ORCiD

Presented as a Small Group/Roundtable Discussion at 2020 IUSM Education Day.Claiming, maintaining, and tracking research output is crucial to a researcher’s continued visibility and impact. Tracking scholarly output and cultivating information about a researcher's work is made possible with online scholarly profile tools. As the most widely accepted unique identifier for authors, ORCiD IDs are increasingly required for: paper submissions to journals, grant submissions, and various NIH research training and career development awards. Attendees participated in hands on activities to set up profiles, and discover more information about tracking their impact going forward, and utilize existing connections between different scholarly profile tools. Learning objectives: • List reasons why maintaining scholarly profiles is important to researchers • Describe the benefits of several scholarly profile tools • Set up and/or update your scholarly profile(s

Anomalously high potentials observed on ISEE

Data from two electric field experiments and from the plasma composition experiment on ISEE-1 are used to show that the spacecraft charged to close to -70 V in sunlight at 0700 UT on March 17, 1978. Data from the electron spectrometer experiment show that there was a potential barrier of -10 to -20 V about the spacecraft during this event. The potential barrier was effective in turning back emitted photoelectrons to the spacecraft. The stringent electrostatic cleanliness specifications imposed on ISEE make the presence of differential charging unlikely. Modeling of this event is required to determine if the barrier was produced by the presence of space charge

Carving My Own Bench by the Road: Examining the Seats of Power for Black Women Educators Through Playwriting

In my dissertation inquiry, I explore the seats of power held by Black women educators in secondary education public schools in Georgia. Theoretically building upon such works as Black feminist thought (Hill Collins, 2000, e.g., hooks, 1981;), womanism (Walker, 2004; Phillips, 2006), critical race theory (Bell, 1992; Delgado, 1989), and engaged pedagogy (hooks, 1994), I create a play explore the oppression experienced by Black women educators who empower themselves for the benefit of students, in some cases abdicate their power, and in a few instances use their power to oppress others (Freire, 1970). The play is crafted based upon government legislations, public meeting notes, newspaper articles, textbooks and other artifacts. I also use reflective notes, daily conversations, journal entries, and other artifacts to fictionalize the counterstories of the Black women educators in public schools. I challenge the metanarrative of “failing public schools” filled with “ineffective” teachers. Playwriting enables me to answer August Wilson’s call for: honesty, purpose, and Black aesthetics (Bryer & Hartig, 2006) in all playwrights. Nine meanings have emerged from my dissertation inquiry: (1) Black feminist thought empowers Black women educators and is beneficial for all students. (2) “White supremacist capitalist patriarchy” (hooks, 1981) suppresses both students and teachers and provokes Black women educators into acts of liberation and protest. (3) Black mothering in the classroom represents both power and weakness for Black women educators. (4) Black women educators, who “talk back,” (hooks b. , 1989) battle White resistance and White fatigue that leads to Black exhaustion. (5) Self-definition (Hill Collins, 2000) and self-actualization (hooks, 1994) empower Black women educators to transgress all form of oppressions to engage in pedagogical praxis (Freire, 1970). (6) The assault on public schools (Watkins, 2011) deskills (Apple, 1982) teachers and disempowers Black women educators. (7) The school to prison pipeline is changing drastically into the school prison complex, where schools become prisons and students become parolees. (8) Oppositional knowledge (Hill Collins, 2000) and Afrofuturism (Dery, 1993) empower Black women educators to reexamine a complicated past, create a better present and invent brighter future for all. (9) I transgress traditional research inquiries to create a play to tell “hidden” and “silenced narratives” of Black women educators by engaging in personal~passionate~participatory inquiry for social justice (He & Phillion, 2008)

Impact ionization study

The impact ionization phenomenon which was observed on certain spacecraft was studied. The phenomenon occurs when a neutral atom, molecule, or ion strikes a surface with sufficient kinetic energy that either the incident neutral or atoms on the surface are ionized, with subsequent escape of ions and/or electrons. The released ions and electrons can interfere with measurements on the spacecraft by confusing interpretation of the data. On the other hand, there is the possibility that the effect could be developed into a diagnostic tool for investigating neutral atmospheric species or for studying physical processes on spacecraft surfaces