35,916 research outputs found
Bragg-induced orbital angular-momentum mixing in paraxial high-finesse cavities
Numerical calculation of vector electromagnetic modes of plano-concave
microcavities reveals that the polarization-dependent reflectivity of a flat
Bragg mirror can lead to unexpected cavity field distributions for nominally
paraxial modes. Even in a rotationally symmetric resonator, certain pairs of
orbital angular momenta are necessarily mixed in an excitation-independent way
to form doublets. A characteristic mixing angle is identified, which even in
the paraxial limit can be designed to have large values. This correction to
Gaussian theory is zeroth-order in deviations from paraxiality. We discuss the
resulting nonuniform polarization fields. Observation will require small
cavities with sufficiently high Q. Possible applications are proposed.Comment: Corrected typos in Fig. 2 and text. Added Journal Ref. For
higher-quality figures, see
http://darkwing.uoregon.edu/~noeckel/papers.php#xref3
Taming the cloud: Safety, certification and compliance for software services - Keynote at the Workshop on Engineering Service-Oriented Applications (WESOA) 2011
The maturity of IT processes, such as software development, can be and is often certified. Current trends in the IT industry suggest that software systems in the future will be very different from their counterparts today, with an increasing adoption of the Service-Oriented Architecture (SOA) design pattern and the deployment of Software-as-a-Service (SaaS) on Cloud infrastructures. In this talk we discuss some issues surrounding engineering Software Services for Cloud infrastructures and highlight the need for enhanced control, service-level agreement and compliance mechanisms for Software Services. Cloud Infrastructures and Service Mash-ups
Advanced service monitoring configurations with SLA decomposition and selection
Service Level Agreements (SLAs) for Software Services aim to clearly identify the service level commitments established between service requesters and providers. The commitments that are agreed however can be expressed in complex notations through a combination of expressions that need to evaluated and monitored efficiently. The dynamic allocation of the responsibility for monitoring SLAs (and often different parts within them) to different monitoring components is necessary as both SLAs and the components available for monitoring them may change dynamically during the operation of a service based system. In this paper we discuss an approach to supporting this dynamic configuration, and in particular, how SLAs expressed in higher-level notations can be efficiently decomposed and appropriate monitoring components dynamically allocated for each part of the agreements. The approach is illustrated with mechanical support in the form of a configuration service which can be incorporated into SLA-based service monitoring infrastructures
Computer enhancement through interpretive techniques Semiannual status report
Digital computer enhancement by use of technique of interpretation rather than compilation of higher ordered language
INTERREGIONAL COMPETITIVE IMPACT OF URBAN INFLUENCED FARMLAND PRICES
The paper's hypothesis is that the farmers using land with urban influenced prices are at a competitive disadvantage because their land input cost exceeds its calitialized earning power while land prices for other farmers are based on earning ability. This hypothesis was investigated by comparing rates of return to land in Massachusetts and two non-urban dairy regions in Wisconsin. Both areas have low rates of return compared to contemporary market interest rates with Massachusetts rates somewhat below those in Wisconsin. When additional factors are considered, the hypothesis is weakly supported, at best.Land Economics/Use,
Development of inorganic non-flammable spacecraft potting, encapsulating, and conformal coating compounds Final report
Development of inorganic nonflammable potting, encapsulating, and coating compounds for spacecraf
Basic requirements of fuel-injection nozzles for quiescent combustion chambers
This report presents test results obtained during an investigation of the performance of a single-cylinder, high-speed, compression-ignition test engine when using multiple-orifice fuel-injection valve nozzles in which the number and the direction of the orifices were varied independently
Spatial and polarization structure in micro-dome resonators: effects of a Bragg mirror
Micro-domes based on a combination of metallic and dielectric multilayer
mirrors are studied using a fully vectorial numerical basis-expansion method
that accurately accounts for the effects of an arbitrary Bragg stack and can
efficiently cover a large range of dome shapes and sizes. Results are examined
from three different viewpoints: (i) the ray-optics limit, (ii) the (semi-)
confocal limit for which exact wave solutions are known, and (iii) the paraxial
approximation using vectorial Gaussian beams.Comment: For higher-quality figures, see
http://darkwing.uoregon.edu/~noeckel/papers.php#xref2
- …