Spontaneous Transport Barriers Quench Turbulent Resistivity in 2D MHD

This Letter identifies the physical mechanism for the quench of turbulent resistivity in 2D MHD. Without an imposed, ordered magnetic field, a multi-scale, blob-and-barrier structure of magnetic potential forms spontaneously. Magnetic energy is concentrated in thin, linear barriers, located at the interstices between blobs. The barriers quench the transport and kinematic decay of magnetic energy. The local transport bifurcation underlying barrier formation is linked to the inverse cascade of $\langle A^2\rangle$ and negative resistivity, which induce local bistability. For small scale forcing, spontaneous layering of the magnetic potential occurs, with barriers located at the interstices between layers. This structure is effectively a magnetic staircase

Stabilization, pointing and command control of a balloon-borne 1-meter telescope

A 1-meter balloon-borne telescope has been constructed and flown to observe far-infrared radiation from celestial sources. The attitude control systems must perform to the diffraction limit of the telescope for stabilization and have positioning capability for source acquisition. These and associated systems are discussed in detail, as is the command control of the payload as a whole

Interview with John and Marcia Diamond by Mike Hastings

Biographical NoteJohn Nathan Diamond was born on November 12, 1954, in Bangor, Maine. His father, Nathan Diamond, was a musician and a teacher, and his mother, Eleanor Diamond, was active in the community and in local politics. John followed politics with his parents, who were registered Republicans until 1978 when they changed their party affiliation and became Democrats. As a teenager, John volunteered for Elmer Violette and Bill Hathaway in 1972. After graduating from Bangor High School, he attended the University of Maine, graduating in 1977. He became involved in the Carter and Muskie campaigns of 1976. He worked for the Lewiston Sun-Journal after college, covering local politics, and then took a job running Jim Henderson’s primary campaign of 1978. He worked for Bill Hathaway in the general election that year and then took a job as a staffer in the Maine state House majority office. In 1980, he was elected to a House seat representing Bangor, and in 1982 he was reelected unopposed. Not having to campaign much for himself, he worked for Mitchell’s 1982 campaign. He met Marcia in 1985 and they were married September 13, 1986. They have two children and live in Bangor, Maine, where John worked for the University of Maine system as executive director of external affairs at the time of this interview. Marcia LaRochelle Diamond was born on June 8, 1962, in Bath, Maine, to Mary Sullivan LaRochelle and Neil LaRochelle. Marcia was the fourth of six children. Her father was a principal in the Bath school system, and he ran a family business called LaRochelle and Sons Market Gardens. Her mother encouraged her to get involved in politics in order to broaden her experience beyond being a teacher, which was the career that Marcia aspired to achieve. Marcia attended the University of Maine, Farmington, graduating early in order to intern in Mitchell’s office in Washington D.C. She began in the press office, and when the term of her internship was over she was hired as assistant press secretary. After a few years, she moved back to Maine to provide Senator Mitchell’s office with a press presence at home. After marrying John and finding that Mitchell’s seat was safe for the 1988 campaign, Marcia retired from her political career and pursued teaching. She began teaching sixth grade at East Corinth School and became involved in the Odyssey of the Mind program. After a hiatus rearing her children, she returned to teaching at St. Mary’s Catholic School, which merged with St. John’s Catholic School in 2000 to become All Saints Catholic School, where Marcia served as principal at the time of this interview. SummaryInterview includes discussions of: growing up in Maine; the 1972 election; the University of Maine; the 1976 election; John’s running for the legislature in 1980; the Penobscot County Democrats; taking John’s seventy-five year old grandmother to see President Carter during his visit to Bangor in 1980; Bangor in the 1960s and 1970s; Marcia’s connection with Gayle Cory; Marcia’s internship in Mitchell’s Senate office in Washington, D.C. and subsequent work in Mitchell’s press office; Marcia’s decision to return to Maine; how John and Marcia met, their first date, and John’s proposal; how John got involved in Mitchell’s 1982 campaign; the field operation in 1982; how Mitchell developed his public persona; forecasting that nuclear and environmental issues would become crucial issues in the 1980s; the campaign strategy of following up on phone calls with letters about issues relevant to the phone conversation; the Fourth of July Parade in Bangor as a turning point in the 1982 campaign; election night, 1982; Marcia’s involvement with Odyssey of the Mind; John’s and Marcia’s small business; Marcia’s career in education; John’s work with Maine Public Broadcasting; how Marcia learned from Gayle Cory to never take “no” for an answer; and the forgotten luggage story

Analysis of water-soluble vitamins in biopharma raw materials by electrophoresis micro-chips with contactless conductivity detection

Detailed information concerning the composition of the raw materials employed in the production of biologics is important for the efficient control and optimization of bioprocesses. The analytical methods used in these applications must be simple and fast as well as be easily transferable from one site to another. In that context, microchip‐based electrophoresis represents a promising tool for application in the analysis of raw materials in biologics. Using electrophoresis micro‐chips, analysis times can be reduced to seconds and high separation efficiencies can be achieved using extremely low volume samples, minimal reagent consumption and waste generation, low cost/disposability, portability and ease of mass‐production [1]. Additionally the use of Capacitively Coupled Contactless Conductivity Detection (C4D) offers a rather simple and yet sensitive method for detection of ionic species. Recently, C4D has gained much popularity as on‐chip detection in electrophoresis micro‐chips [2]. The main reason for this is that there is no physical contact of the detection electrodes with the electrolyte solution. Therefore, the integration of this detection mode within the analytical system is rather simple. Furthermore, the background noise is significantly reduced leading to lower detection limits than the conventional contact conductivity detection. Vitamins are present at very low concentrations in biopharma raw materials and are usually determined using HPLC and CE methods [3]. Electrophoresis micro‐chips are a very good alternative to these techniques due to the shorter analysis time and yet very good resolution, among others. In this paper, we present the application of electrophoresis micro‐chips with C4D detection to the analysis of water‐soluble vitamins in raw materials used for the production of biologics in bioreactors. For that purpose, hybrid PDMS/glass chips were fabricated by using standard photolithographic techniques (Figure 1). The chip structure contains an extremely long channel of 101 mm (50 x 50 μm width x depth). Figure 2 shows the setup used for vitamins detection

A Survey of Native Bees and Their Floral Use in Portland\u27s Urban Orchards

Native bees are all around us, yet very few surveys have been performed on which bees reside in Portland, Oregon. For this honors thesis, native bees collected from two urban orchards and one botanical garden located in eastern Portland in 2018 and 2019 were identified to genus or to species, and their floral use recorded. This data will become part of the ongoing native bee survey being performed by Susan Masta\u27s laboratory and the Museum of Natural History at Portland State University. The bees that were most commonly collected included Ceratina spp. (n = 42), Andrena spp. (n = 34), Halictus spp. (n = 29), and Bombus spp. (n = 21). Observations made during these collections suggest that a diversity of floral resources, but especially ornamental plants within Asteraceae, Rosaceae, and Boraginaceae (notably genera Erigeron, Symphyotrichum, Fragaria, and Pentaglottis) may support a wide diversity of native bees in an urban or suburban orchard setting over the greatest proportion of native bee flight seasons