Geometric, aerodynamic, and kinematic characteristics of two twin keel parawings during deployment

Flight test data on geometric, aerodynamic, and kinematic characteristics of two twin keel parawings during deploymen

A Laboratory Experiment Involving Paper-Chromatography and Statistics

This article suggests a paper chromatographic separation of the dyes in commercial black inks, which has been designed for completion in one 3-hour laboratory period with the use of equipment and solvents found in practically all laboratories. The experiment gives very satisfactory results, and allows the student to become familiar with the general field of paper chromatography and some of the factors which affect Rf values of constituents of mixtures. It also may be used to demonstrate the use of simple statistical tests, if desired

Determination of Copper in Lead and Lead Base Alloys

This work was undertaken in an effort to develop a rapid method for the determination of copper in the range of 0.01 to 0.06% in lead alloys and in the range of 0.001 to 0.005% in lead. A visual and a photometric method are suggested, based on the color developed by copper in concentrated hydrochloric acid. Iron interferes with the determination, but this interference is reduced by use of an aluminum file in the visual method, and is corrected for in the photometric method by determination of the Lron as the thiocyanate. The visual method is very rapid, is accurate to plus or minus 0.1% in the range 0.01-0.06%, and is suggested as a control method for alloys. The photometric procedure is accurate to better than 0.006% in the range of 0.01 to 0.05% and 0.0005% in the range 0.001 to 0.005%, and is suggested as a routine or control method

Too Agile? - DevOps Software Development Challenges in a Military Environment

Agile and DevOps software development processes now represent proven, commonly accepted models in commercial industry. For DoD military environments however, empowering teams of software developers and end user operators to build, test and release solutions without direct oversight and management of leadership is a brand new experience. In 2017, a DoD software acquisitions revolution occurred when approval was granted to scrap the former ineffective, cost prohibitive process and initiate the agile DevOps model. After one year since its introduction, this paper may represent the very first look at how well this nontraditional process is working out in a military command and control (C2) environment. More specifically, the study attempts to answer concerns by an USAF air operations center (AOC) headquarters that the process may not be delivering value to end user operators

Analytical comparison of transient and steady state visual evoked cortical potentials

To better describe the linear-dynamic properties of the human visual-cortical response system, transient and steady state Visual Evoked Response Potentials (VERP) were observed. The stimulus presentation device provided both the evoking stimulus (flickering or pulsing lights) and a video task display. The steady state stimulus was modulated by a complex, ten frequency, sum-of-sines, wave. The transient VERP was the time-locked average of the EEG to a series of narrow light pulses (pulse width of 10 msec). The Fourier transform of the averaged pulses had properties that approximate band limited white noise, i.e., a flat spectrum over the frequency region spanned by the 10 summed sines. The Fourier transform of both the steady state and the transient evoked potentials resulted in transfer that are equivalent and therefore comparable. To investigate the effects of task loading on evoked potentials, a grammatical reasoning task was provided. Results support the relevancy of continued application of a systems engineering approach for describing neurosensory functioning

Parenting the Premature Infant: Potential Iatrogenesis from the Neonatal Intensive Care Experience

(1) Developmental outcomes of premature infants are associated with the quality of the home environment and the level of parenting skills the family possesses. Successful development of the parenting role may be negatively influenced by the Neonatal Intensive Care Unit (NICU) environment and nursing practices. Identification of interventions that promote the development of parenting skills in the NICU can potentially improve developmental outcomes for premature infants.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73814/1/j.1524-475X.1996.00046.x.pd

Ammi visnaga (L.) Lam. (Apiaceae), a new taxon in Croatian flora

During floristic research into the island of Bra~ (Dalmatia, Croatia) in 2010, Ammi visnaga (L.) Lam. (Apiaceae), a new neophyte for Croatia was found in several localities and natural habitats. At the altitude of 380–460 m above sea level, mostly in habitats disturbed by humans, the located populations were composed of numerous and vital specimens in blooms and with fruits. The gradual and successful integration of this species into the natural vegetation was noticed, particularly in grasslands of the association Brachypodio retuso-Trifolietum stellati Horvati} 1958 and macchia of the association Fraxino orno-Quercetum ilicis Horvati} (1956) 1958

Connecting children’s worlds: Creating a multilingual syncretic curriculum through partnership between complementary and mainstream schools

Children from minority-language backgrounds have multiple sites of learning: home, community, mainstream school, and in some cases complementary school where they study their mother tongue after school or at weekends. However, due to the institutional constraints of an education system based on monolingual principles, mainstream teachers are often unaware of the contribution that complementary classes make to children’s learning, or unsure of how to draw on their pupils’ linguistic knowledge in the curriculum. Children’s multilingual identities and their other worlds of learning therefore remain invisible in mainstream school. This paper describes an action research study with teachers from complementary and mainstream schools in East London, in which they jointly planned lessons around topics that were then taught in both settings. The complementary teachers brought a holistic perspective based in the linguistic and cultural knowledge of their communities, which enabled these resources to be brought into mainstream learning, thus creating a syncretic curriculum that led to an increase in agency of children and their families as well as teachers themselves. We argue that collaboration between complementary and mainstream teacher colleagues can play a crucial role in constructing a space for multilingual learning in a monolingualizing society

Design, Commissioning and Performance of the PIBETA Detector at PSI

We describe the design, construction and performance of the PIBETA detector built for the precise measurement of the branching ratio of pion beta decay, pi+ -> pi0 e+ nu, at the Paul Scherrer Institute. The central part of the detector is a 240-module spherical pure CsI calorimeter covering 3*pi sr solid angle. The calorimeter is supplemented with an active collimator/beam degrader system, an active segmented plastic target, a pair of low-mass cylindrical wire chambers and a 20-element cylindrical plastic scintillator hodoscope. The whole detector system is housed inside a temperature-controlled lead brick enclosure which in turn is lined with cosmic muon plastic veto counters. Commissioning and calibration data were taken during two three-month beam periods in 1999/2000 with pi+ stopping rates between 1.3*E3 pi+/s and 1.3*E6 pi+/s. We examine the timing, energy and angular detector resolution for photons, positrons and protons in the energy range of 5-150 MeV, as well as the response of the detector to cosmic muons. We illustrate the detector signatures for the assorted rare pion and muon decays and their associated backgrounds.Comment: 117 pages, 48 Postscript figures, 5 tables, Elsevier LaTeX, submitted to Nucl. Instrum. Meth.

Modification of cell wall polysaccharide guides cell division in <i>Streptococcus mutans</i>

In ovoid-shaped, Gram-positive bacteria, MapZ guides FtsZ-ring positioning at cell equators. The cell wall of the ovococcus Streptococcus mutans contains peptidoglycan decorated with serotype c carbohydrates (SCCs). In the present study, we identify the major cell separation autolysin AtlA as an SCC-binding protein. AtlA binding to SCC is attenuated by the glycerol phosphate (GroP) modification. Using fluorescently labeled AtlA constructs, we mapped SCC distribution on the streptococcal surface, revealing enrichment of GroP-deficient immature SCCs at the cell poles and equators. The immature SCCs co-localize with MapZ at the equatorial rings throughout the cell cycle. In GroP-deficient mutants, AtlA is mislocalized, resulting in dysregulated cellular autolysis. These mutants display morphological abnormalities associated with MapZ mislocalization, leading to FtsZ-ring misplacement. Altogether, our data support a model in which maturation of a cell wall polysaccharide provides the molecular cues for the recruitment of cell division machinery, ensuring proper daughter cell separation and FtsZ-ring positioning. [Figure not available: see fulltext.