Harmonic operation of a free-electron laser

Harmonic operation of a free-electron-laser amplifier is studied. The key issue investigated here is suppression of the fundamental. For a tapered amplifier with the right choice of parameters, it is found that the presence of the harmonic mode greatly reduces the growth rate of the fundamental. A limit on the reflection coefficient of the fundamental mode that will ensure stable operation is derived. The relative merits of tripling the frequency by operating at the third harmonic versus decreasing the wiggler period by a factor of 3 are discussed

Analytical studies of in-reactor tests of a nuclear light bulb unit cell

Analytical studies of in-reactor tests of nuclear light bulb unit cell using Pewee, nuclear furnace, and high flux isotope reactor

Analytical design and performance studies of the nuclear light bulb engine

Analytical studies were conducted to investigate in detail the heat balance characteristics of the nuclear light bulb engine. Distributions of energy deposition to all engine components from the fission process, conduction and convection, and thermal radiation were considered. Where uncertainties in basic data or heat transfer characteristics were encountered, ranges of heat loads were calculated and reference values were selected. The influence of these heat loads on engine performance, space radiator requirements, and cooling sequence and cooling circuit designs was determined. The analyses resulted in revisions to the previously reported reference engine characteristics, principally in the heat loads to some engine components and in the cooling sequence. These revisions were incorporated in the engine dynamics digital computer simulation program. No significant changes occurred in the dynamic response of the engine to perturbations in fuel injection rate, reactivity or exhaust nozzle area

Observation of the rare decay B+ -> K+π0π0 and measurement of the quasi-two-body contributions B+ -> K*(892)+π0, B+ -> f0(980)K+, and B+ -> χc0K+

We report an analysis of charmless hadronic decays of charged B mesons to the final state K(+) pi(0)pi(0), using a data sample of (470.9 +/- 2.8) x 10(6) B (B) over bar events collected with the BABAR detector at the Y(4S) resonance. We observe an excess of signal events, with a significance above 10 standard deviations including systematic uncertainties, and measure the branching fraction and CP asymmetry to be B(B(+) -> K(+) pi(0)pi(0)) = (16.2 +/- 1.2 +/- 1.5) x 10(-6) and A(CP)(B(+) -> K(+) pi(0)pi(0)) = -0.06 +/- 0.06 +/- 0.04, where the uncertainties are statistical and systematic, respectively. Additionally, we study the contributions of the B(+) -> K*(892)(+) pi(0), B(+) -> f(0)(980)K(+), and B(+) -> chi(c0)K(+) quasi-two-body decays. We report the world's best measurements of the branching fraction and CP asymmetry of the B(+) -> K(+) pi(0)pi(0) and B(+) -> K(+)(892)(+) pi(0) channels

Analytical studies of nuclear light bulb engine radiant heat transfer and performance characteristics

Analytical model of nuclear light bulb engine radiant heat transfer and engine performance, dynamics and control, heat loads and shutdown characteristic

Studies of nuclear light bulb start-up conditions and engine dynamics

Deep Space Network for two-way communications with unmanned spacecraft at planetary distances - Vol.

Nuclear studies of the nuclear light bulb rocket engine

Uranium 233 critical mass requirements, neutron kinetic behavior, and neutron and gamma ray heating rates for nuclear light bulb rocket engin

Nuclear criticality studies of specific nuclear light bulb and open-cycle gaseous nuclear rocket engines

U-233 critical mass requirements for two specific vortex stabilized nuclear light bulb and open cycle gaseous nuclear rocket engine

Analytical study of hydrogen turbopump cycles for advanced nuclear rockets Progress report, Sep. 15, 1964 - Sep. 15, 1965

Hydrogen turbopump cycles for obtaining high engine inlet pressures in advanced nuclear rockets, and data on gaseous nuclear reactors and heavy gas containmen

Collaborative auto-hermeneutics: Methodological openings and possibilities for studying information experience

As the conceptual interests and cultural import of information science continue to expand, it is important for the field to be open to information-related phenomena that are not captured by extant frameworks. In recent years, there is increasing theoretical interest in alternate ways of knowing and becoming informed, such as collaborative information behaviours (Foster 2010), serendipitous information discovery (Toms 2000; Erdelez et al, 2016) information as instinct (Spink 2010), and knowing in practice (Savolainen 2009). Information experience is another area of conceptual interest, which is defined as the way in which people experience or derive meaning when they engage with information within their everyday lives (Bruce et al., 2014). To be open in this way requires us to embrace new methodologies, particularly those that are exploratory. We take inspiration from Robert Stebbins’ serious-leisure perspective (SLP); this perspective provides a common ground for researchers – not unlike other serious leisure pursuers – who pursue a career volunteer activity that captivates participants with its complexity and many challenges and embodies unique qualities such as earnestness, sincerity, importance, and carefulness, with profound, long-lasting, and substantial skill, knowledge, or experience which provides them with common grounds for conversing and building togetherness (Stebbins 2001). The social inclusion developed from participating in leisure activities attracts cultural richness, notably for its shared goals, problems, values, experiences, and costs and rewards (Stebbins 2011). We hope that information science can experience a similar opening and renewal through this approach within our own exploratory research. As one such exploratory methodology, Gorichanaz (2017) proposed auto-hermeneutics for the study of information experience. In our full paper proposed for this conference (Latham, Narayan, & Gorichanaz, 2017), we utilise auto-hermeneutics in a novel way: as collaboration. In this roundtable discussion, we discuss methodological issues and challenges of conducting collaborative auto-hermeneutics. We connect it to the idea of intrinsic motivation, or participation in an activity for its inherent satisfactions. Although, in one sense, intrinsic motivation exists within individuals, in another sense intrinsic motivation exists in the relation between individuals and activities (Ryan & Deci 2001). Because intrinsic motivation exists in the nexus between a person and a task, it is often defined in terms of the task being interesting or the satisfactions a person gains from intrinsically motivated task engagement (Ryan & Deci 2001). We propose the use of practice theory (Gherardi 2009) to build upon the concepts of serious leisure and intrinsic motivation in the study of information experience as a creative experience