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