Investigation of the grain boundary layer characteristics of donor doped barium titanate ceramics.

SIGLEAvailable from British Library Document Supply Centre- DSC:D79515 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

The conflict between industry hosts and master’s degree students’ expectations on students entering the hospitality industry

This paper reports on a qualitative study that sought to determine Australian industry hosts’ expectations and perceptions of hotel management master’s degree students on their placement in the industry, and the expectations of students when entering industry placement. The empirical dataset for this qualitative study was collected through student and industry focus groups and individual semi-structured interviews with master’s students and managers of hotels in Sydney, Australia. The technique used for analysing the data was progressive comparative analysis, after which a constant comparative methodology was applied. The conclusions outline common themes and issues identified by students and their hosts and highlight a need for educators to better prepare both students and hosts.Keywords: work integrated learning, industry placements, master’s programmes, hospitality, education, hote

Zr-containing 4,4\u27-ODA/PMDA polyimide composites parts I and II

The objective of this research is to improve the atomic oxygen resistance of KaptonTM, a polyimide (PI) made from pyromellitic acid dianhydride (PMDA) and 4,4\u27-oxydianiline (ODA), while retaining or enhancing the desirable properties of the pure polymer. Toward this end, zirconium-containing complexes and polymers were used to make composites and blends. Tetra(acetylacetonato)zirconium(IV), Zr(acac)4, which is commercially available, was identified as the best zirconium-containing complex for enhancing the atomic oxygen resistance of polyimide composites of the 10 complexes screened. Films prepared from the commercially-available polyamic acid (PAA) of PMDA-ODA (DuPont) have good uniformity, flexibility, and tensile strength. A 24-layer 10% (mol) Zr(acac)4/PI composite film showed significant improvement (ca. 20 fold) of atomic oxygen resistance over the pure polyimide. However, 10% (mol) Zr(acac)4 represents an upper concentration limit, above which films undergo cracking upon thermal imidization. In order to increase the Zr complex concentration in PMDA-ODA PI films, while retaining good film properties, [Zr(adsp)2-PMDA]n coordination polymer [bis(4-amino-N,N\u27-disalicylidene-1,2-phenylenediamino)zirconium(IV)-pyromellitic dianhydride] and [Zr(adsp)2-PMDA-ODA-PMDA]n terpolymer were synthesized and blended with commercial PAA, respectively. Several techniques were used to characterize the films made from the polymer containing Zr(acac)4. Plasma studies of films having 2% (mol) incremental concentrations of Zr in the Kapton up to 10% (mol) show that the overall rate of erosion is reduced about 75 percent

Bis{4,4′,6,6′-tetra­chloro-2,2′-[trans-(R,R)-cyclo­hexane-1,2-diylbis(imino­methyl­ene)]diphenolato-κ4 O,N,N′,O′}zirconium(IV)

The title mononuclear complex, [Zr(C20H20Cl4N2O2)2], was obtained by allowing hexane to diffuse into a diethyl ether solution of zirconium(IV) sec-butoxide and the enanti­o­meri­cally pure tetra­dentate ligand N,N′-bis­(3,5-dichloro-2-hy­droxy­benz­yl)-trans-(R,R)-1,2-diamino­cyclo­hexane. The metal centre is eight-coordinate and displays a distorted dodeca­hedral coordination environment with average Zr—O and Zr—N bond lengths of 2.082 (9) and 2.441 (8) Å, respectively. In the crystal structure, complex mol­ecules are linked by inter­molecular C—H⋯Cl hydrogen-bond inter­actions into zigzag chains running parallel to the [101] direction. C—H⋯O and N—H⋯O hydrogen bonds are also present

Bis(μ-2-{bis­[(2-oxidobenzyl­idene)amino]­meth­yl}phenolato)bis­[(tetra­hydro­furan)­samarium(III)] tetra­hydro­furan disolvate

In the centrosymmetric binuclear complex of the title solvate, [Sm2(C21H15N2O3)2(C4H8O)2]·2C4H8O, the SmIII is coordin­ated in a distorted monocapped octa­hedral geometry by four O atoms and two N atoms from two tridentate deprotonated 2-{bis­[(2-oxidobenzyl­idene)amino]­meth­yl}phenolate ligands and an O atom of a tetra­hydro­furan (THF) mol­ecule. The Sm⋯Sm distance in the complex is 3.8057 (4) Å. Parts of the coordinating THF mol­ecule are disordered over two sets of sites in a 0.56 (3):0.44 (3) ratio. The complex and solvent mol­ecules are linked into a three-dimensional structure via C—H⋯O hydrogen-bonding inter­actions

Understanding infant eating behaviour – Lessons learned from observation

Observations of human infants during feeding presents a rich source of data to identify the ways in which hunger, appetite and satiety are communicated in early life. Infants signal appetite through their interest or disinterest in food using a series of communication cues from rapid and transient facial expressions to subtle or potent gestures and bodily movements through to vocalisations and eventually speech. Even in the first days of life facial expressions in response to basic tastes are clearly demonstrated and shared between human infants, other primates and the rat. These sensory typical reactions are said to have biological significance since the positive affective response to sweet taste secures a safe and useful source of energy whilst an aversive response to bitter may protect against toxicity. However, beyond these shared responses to basic tastes, the human infant has a sophisticated communication system to demonstrate readiness to eat, avid or waning appetite and satiety. Video capture and behavioural coding of infant communication and caregiver responses during meals reveal the dynamic nature of mealtime interactions. Responsiveness to infant cues is influenced by maternal characteristics and mode of feeding. Breastfeeding facilitates communication by enhancing maternal responsiveness and increasing the frequency of engagement and disengagement cues of the infant. This demonstrates the bi-directionality and interdependence of infant communication during a feed, namely that more responsive feeding for example, through breastfeeding, is associated with more proficient communication by the infant. Overall, observational methods have revealed the complex ways in which infants signal energy needs to their caregivers, and in turn these same methods have captured on film the ways in which carers recognise and react to these signals as part of responsive feeding. Potential applications of these methods includes developing interventions to facilitate infant self-regulation through responsive feeding

Paper Session II-B - The Advanced Camera for the Hubble Space Telescope

The Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) will have a high throughput, wide field, optical and I-band camera (WFC), a critically sampled high resolution camera (HRC), and a high throughput, moderate field of view far ultraviolet, solar-blind camera (SBC). The key characteristics of the ACS are listed in Table 1. The throughputs include the geometrical, scattering, and reflectivity losses from the HST optical telescope assembly (Burrows, HST OTA Handbook). Two figures are listed for the ACS efficiencies. The first is the efficiency using the quantum efficiency (QE) of the Scientific Imaging Technologies (SITe) 2K x 4K WFC CCDs and the SITe HRC 1K ´ 1K CCDs selected for the first build of the flight cameras. The second and higher efficiencies are those achieved with SITe CCDs processed and anti-reflection coated at Steward Observatory by Dr. Michael Lesser. We plan to use these better CCDs for the second build of the flight cameras

Weapons Design Analysis Using 1-Meter Terrain Resolution Battlefield Simulators

Fall 2000 Simulation Interoperability Workshop, Paper Number 118.Simulation Interoperability Standards Organization (SISO) SIW Conference PaperSimulation of battlefield systems in operational scenarios require the calculation of concealment, cover, and detectability to properly evaluate their performance and effectiveness on the battlefield. In the past so called “high resolution” simulations such as Janus and the Combined Arms and Support Task Force Evaluation Model (CASTFOREM) typically performed such calculations using geometric line-of-sight (GLOS) on 25-meter terrain resolution and model micro-terrain effects statistically. Results provided by such simulations do not account for the individual soldier’s ability to take advantage of local cover and concealment in an individual engagement while carrying out tactical missions. New 1-meter terrain analysis tools developed by personnel at the Naval Postgraduate School(NPS), the U.S. Army Training and Doctrine Command (TRADOC), and independent contractors have allowed substantial improvement in our ability to simulate individual engagements and assess the effects of micro terrain features on tactical mission success. This paper introduces the architecture and fast ray-tracing algorithms capable of calculating realistic 1-meter terrain perspective views in real-time on PC based platforms. We then describe how this algorithm is extended to perform view-based line-of-sight calculations (VLOS) and replace the old GLOS approach. This new technique calculates a small perspective view for each simulation player pair of interest. The perspective view is then analyzed. Partial player visibility, sensor location, major obscurant, and background contrast information are now all available and can be used to perform deterministically modeled detections and engagement effectiveness calculations. We conclude the paper with case studies conducted to analyze the effectiveness of various system designs utilizing the 1-meter terrain tools now available. We describe the ability to select routes, modify tactics, and analyze engagement opportunities when accounting for high-resolution terrain features. Sample analysis results are presented to show the effects of design alternatives on mission performance