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排序方式: 共有196条查询结果,搜索用时 15 毫秒
1.
Shute H.A. Wilton D.T. McKirdy D.Mc.A. Mapps D.J. 《IEEE transactions on magnetics》2004,40(5):3402-3406
We have used a series of singular expansion functions to represent the potential across the gap of a shielded pole head in the presence of a highly permeable underlayer. This method of analysis reduces the size of the system of equations to be solved for the series coefficients to the number of coefficients that will be used. Just two series terms suffice to evaluate the magnetic potential to within 1% of the pole potential at any point on the air-bearing surface for a large range of head dimensions. Here, we express the surface field spectrum analytically. Including just two series terms provides an excellent estimate. 相似文献
2.
Bonto-Kane Maria Vicente A. Chin Alvin Mc Carthy Sheila Srikulwong Mayuree Timmins Paul J. 《Pervasive Computing, IEEE》2007,6(4)
Pervasive computing is as much about the user as it is about the technology. So, the Fifth International Conference on Pervasive Computing emphasized desirability rather than just feasibility. Featured themes included user benefits, human-computer interaction, group and social interactions, context awareness, finding and positioning people and objects, and personal privacy. 相似文献
3.
4.
Joan?CahillEmail author Nick?Mc?Donald Captain?Gabriel?Losa 《Cognition, Technology & Work》2011,13(1):43-66
A safe flight starts with effective performance of the pre-flight flight planning and briefing task. However, several problems
related to the execution of this task can be identified. Potentially, the introduction of an improved flight plan provides
an opportunity to improve the quality and availability of information provided to Flight Crew, thereby enhancing the quality
of crew briefings. The proposed risk-based, intelligent flight plan is designed from the perspective of the current operational
concept (e.g. fixed routes and ATC managerial role for separation), and associated airline Flight Planning and Dispatch functions.
In this case, the focus is sharing information across specific airline stakeholders (e.g. Flight Operations Management and
Safety functions) and Maintenance, to support a safe and efficient flight operation. Overall, the introduction of this new
flight plan will result in the definition of new operational and organisational processes, along with a new way of performing
the pre-flight, planning and briefing task. It is anticipated that this will impact positively on the operational and safety
outcome of the flight. 相似文献
5.
Simulation motion of Virtual Reality (VR) objects and humans has experienced important developments in the last decade. However,
realistic virtual human animation generation remains a major challenge, even if applications are numerous, from VR games to
medical training. This paper proposes different methods for animating virtual humans, including blending simultaneous animations
of various temporal relations with multiple animation channels, minimal visemes for lip synchronisation, and space sites of
virtual human and 3D object models for object grasping and manipulation. We present our work in our natural language visualisation
(animation) system, CONFUCIUS, and describe how the proposed approaches are employed in CONFUCIUS’ animation engine. 相似文献
6.
S. L. Price H. L. Hettich S. Sen M. C. Currie D. R. Rhiger E. O. Mc Lean 《Journal of Electronic Materials》1998,27(6):564-572
With the goal of maximizing the yield of infrared focal plane arrays (IRFPAs), Santa Barbara Research Center’s (SBRC) Infrared
Materials Producibility Program (IRMP) has focused on assessing and improving the quality, yield, and throughput of CdZnTe
substrates. A baseline detector lot was fabricated to identify the critical drivers of IRFPA yield coming from the substrates
and to evaluate the quality and yield of the current vendor base for CdZnTe substrates. Substrate induced defects and impurities
that can potentially affect device performance and operability were carefully mapped out in detail on 44 × 67 mm2 size substrates, received from IRMP substrate vendors as well as SBRC. This paper will report on the correlations found between
this substrate characterization data base and the IRFPA level defect distributions. Key results from these correlation studies
are: (1) extended defects found on the substrates with the Nakagawa etch correlated well with responsivity reduction in the
final IRFPA; (2) cross-hatch patterns that were evident in the responsivity map correlated well with similar features seen
by x-ray topography on LPE double layers; and (3) a possible correlation of device performance (leakage current at 78K) with
copper and lithium impurities in the substrate. Recent initiatives toward improving the quality and yield of the substrate
growth process have focused on improving purity in the pre-growth charge preparation, modification of growth parameters to
reduce defects and scaling up of the vertical Bridgman growth process from its current 67 mm diameter boule size to 92 mm
diameter boules. Promising initial results from the large diameter boule growth process will be shown. The 92 mm diameter
CdZnTe boule (6 kg charge) shows two predominant single crystal grains encompassing 75% of boule volume. Defect characterization
of boules grown under baseline and modified conditions is discussed. 相似文献
7.
Mc Henry KT Ankala SV Ghosh AK Fenteany G 《Chembiochem : a European journal of chemical biology》2002,3(11):1105-1111
We have developed a high-throughput assay for screening chemical libraries for compounds that affect cell sheet migration during wound closure in epithelial cell monolayers. By using this assay, we have discovered a new inhibitor of cell sheet migration. This compound (UIC-1005) is a 3,4-disubstituted oxazolidinone that bears an electrophilic alpha,beta-unsaturated N-acyl group required for activity. UIC-1005 also inhibits growth in an epithelial cell proliferation assay. The molecule does not display general toxicity at concentrations at which it potently inhibits cell sheet migration and growth. Unlike certain 3,5-disubstituted oxazolidinones, it exhibits no antibacterial activity. UIC-1005 therefore represents a new class of bioactive oxazolidinone derivative that may prove useful as a probe for signaling pathways leading to cell motility. 相似文献
8.
A large scale model analysis, using embedded strain gauges, of the strain distribution in the cement mantle surrounding a femoral prosthesis is underway. In order to predict, and so avoid, positions of locally high strain gradients in this model, a finite element and experimental analysis of a similar problem was undertaken. For this purpose, a loose fitting rectangular steel insert inside a surrounding rectangular epoxy sheath was used to model an extreme case of the torsional and bending components of hip joint load. The axial component of joint load was modelled using an axisymmetric finite element model of a tapered shaft. The finite element results were used to determine suitable positions for embedding gauges in the experimental model. Results showed that the finite element analysis failed to adequately model the close sliding fit between the steel insert and epoxy. Altering the experimental model to artificially replicate the finite element contact conditions produced good correlation in bending, with experimental strains agreeing with simple bending theory to within 6%. Satisfactory correlation under torsional loading was not obtained, but strain magnitudes were low. Predicted positions for embedding gauges give conservative results, lessening the possibility of strain gradient induced error in the large scale model test of the cement mantle and prosthesis. 相似文献
9.
W. J. Mc Creary 《JOM Journal of the Minerals, Metals and Materials Society》1958,10(9):615-617
Calcium metal of high purity, important in the massive preparation of high purity uranium, has been made by fractional distillation process. Calcium so prepared has less than 1 ppm Mg and is better than 99.95 pct pure. 相似文献
10.
R. Bonifacio B. Mc Neil A. C. J. Paes L. de Salvo R. M. O. Galvão 《Journal of Infrared, Millimeter and Terahertz Waves》2007,28(9):699-704
The basic physics, results of 3–D simulations, and relevant parameters for the design of a far infrared FEL, which operates in the SASE superradiant short bunch regime, are presented. It is shown that a quite interesting device can be easily developed, with rather new features, producing coherent laser pulses with ~10 psec duration and around 7 MW peak power. 相似文献