Development of Bayesian analysis program for extraction of polarisation observables at CLAS

At the mass scale of a proton, the strong force is not well understood. Various quark models exist, but it is important to determine which quark model(s) are most accurate. Experimentally, finding resonances predicted by some models and not others would give valuable insight into this fundamental interaction. Several labs around the world use photoproduction experiments to find these missing resonances. The aim of this work is to develop a robust Bayesian data analysis program for extracting polarisation observables from pseudoscalar meson photoproduction experiments using CLAS at Jefferson Lab. This method, known as nested sampling, has been compared to traditional methods and has incorporated data parallelisation and GPU programming. It involves an event-by-event likelihood function, which has no associated loss of information from histogram binning, and results can be easily constrained to the physical region. One of the most important advantages of the nested sampling approach is that data from different experiments can be combined and analysed simultaneously. Results on both simulated and previously analysed experimental data for the K+Λ channel will be discussed

Spectrophotometry of Michigan-Tololo quasars

Emission-line quasar characteristics are confirmed for 80% of the objects observed, including at least four new quasars with spectral features indicative of supernova-like outflow. Approximately 73% of the redshifts predicted from the discovery plates are found accurate with a mean error in z of 0.03, and a large range of z (from about 0.1 to 3.16) is represented in the sample. The observed redshift distribution for quasars is marginally consistent with a constant co-moving quasar density above z approximately 2.0. The shape of the redshift distribution may be used as an isotropy probe with a cosmic time resolution of a few times one-hundred million years in the early universe; therefore, continued surveys of this sort are important even if accurate magnitudes are not determined

Feasibility of active feedback control of rotordynamic instability

Some of the considerations involved in the use of feedback control as a means of eliminating or alleviating rotordynamic instability are discussed. A simple model of a mass on a flexible shaft is used to illustrate the application of feedback control concepts

Effect of damper on overall and blade-element performance of a compressor rotor having a tip speed of 1151 feet per second and an aspect ratio of 3.6

The overall and blade-element performance of two configurations of a moderately high aspect ratio transonic compressor rotor are presented. The subject rotor has conventional blade dampers. The performance is compared with a rotor utilizing dual wire friction dampers. At design speed the subject achieved a pressure ratio of 1.52 and efficiency of 0.89 at a near design weight flow of 72.1 pounds per second. The rotor with wire dampers gave consistently higher pressure ratios at each speed, but efficiencies for the two rotors were about the same. Stall margin for the subject rotor was 20.4 percent, but for the wire damped rotor only 4.0 percent

A study of oxidation kinetics of nickel metal in flowing air and oxygen-nitrogen mixtures

Oxidation kinetics of nickel sheet in flowing air and gas mixture

The content of whistleblowing procedures: a critical review of recent official guidelines

There is an increasing recognition of the need to provide ways for people to raise concerns about suspected wrongdoing by promoting internal policies and procedures which offer proper safeguards to actual and potential whistleblowers. Many organisations in both the public and private sectors now have such measures and these display a wide variety of operating modalities: in-house or outsourced, anonymous/confidential/identified, multi or single tiered, specified or open subject matter, etc. As a result of this development, a number of guidelines and policy documents have been produced by authoritative bodies. This article reviews the following five documents from a management perspective, the first two deal with the principles upon which legislation might be based and the others describing good management practice: the Council of Europe Resolution 1729 (COER); Transparency International ‘Recommended Principles for Whistleblowing Legislation’ (TI); European Union Article 29 Data Protection Working Party Opinion (EUWP); International Chamber of Commerce ‘Guidelines on Whistleblowing’ (ICC); and the British Standards Institute ‘Whistleblowing arrangements Code of Practice 2008 (BSI)

Trade unions and the whistleblowing process in the UK: an opportunity for strategic expansion?

Historically, whistleblowing research has predominantly focused on psychological and organisational conditions of raising concerns about alleged wrongdoing. Today, however, policy makers increasingly start to look at institutional frameworks for protecting whistleblowers and responding to their concerns. This article focuses on the latter by exploring the roles that trade unions might adopt in order to improve responsiveness in the whistleblowing process. Research has consistently demonstrated that the two main reasons that deter people from reporting perceived wrongdoing are fear of retaliation and a belief that the wrongdoing is unlikely to be rectified. In this article we argue that trade unions have an important part to play in dealing with both these inhibiting factors but this requires them to be appropriately engaged in the whistleblowing process and willing to take a more proactive approach to negotiations. We use Vandekerckhove’s 3-tiered whistleblowing model and Kaine’s model of union voice level to structure our speculative analysis of the various ways in which trade unions can interact with whistleblowers and organisations they raise concerns about alleged wrongdoing in, as well as agents at a regulatory level. Our articulation of specific roles trade unions can play in the whistleblowing process uses examples from the UK as to how these trade union roles are currently linked to and embedded in employment law and whistleblowing regulation