The ultra-wideband pulse

Since the birth of mode-locking the temporal duration of optical pulses has radically diminished. In parallel to this, bandwidths have grown so large that almost entire frequency octaves are present in today’s few-cycle pulses. This thesis investigates the character of ultra-wideband pulses in nonlinear environments. Because of the growth in optical bandwidths, traditional definitions and propagation models break down, requiring newer more accurate numerical techniques. A novel approach capturing the uni-directionality of pulses is presented in the form of Gvariables by combining the electric and magnetic field descriptions. These G-variables have the advantage of both an accurate spectral representation and a reduced computational overhead, making them significantly more efficient than existing direct Maxwell solvers. Such approaches are particularly important where large propagation distances and/or transverse dimensions are concerned. Pseudo-spectral techniques play a key role in the success of these wideband models enabling sub-cycle dynamics to be studied. One such phenomenon is Carrier Wave Shocking (CWS), where the optical carrier undergoes self-steepening in the presence of third-order nonlinearity. This process is carefully studied, focussing on the effect of dispersion and the feasibility of its physical realisation. The process is then generalised to arbitrary nonlinear order, where the quadratic form finds potential applications in High Harmonic Generation (HHG). Shock detection schemes are also developed, and agree with analytical solutions in the dispersionless regime. To fully characterise few-cycle pulses, the absolute Carrier Envelope Phase (CEP) must be known. A novel 0 − f self-referencing scheme relying on wideband interference is investigated. By applying robust frequency domain definitions a proposal is made to convert this scheme into one that determines absolute CEP. The scheme maps the level of spectral interference to absolute CEP using numerical simulations

Introduction: the role and substance of public service operations management

This introductory chapter establishes the need for a book on Public Service Operations Management and then through unpacking the structure and content of the book explore what is meant by Public Service Operations Management

Teamworking under Lean in UK public services: lean teams and team targets in Her Majesty's Revenue & Customs (HMRC)

The authors of The Machine that Changed the World were in no doubt about the importance of teamworking in lean production: ‘in the end’, they say [Womack, J., Jones, D, & Roos, D. (1990). The machine that changed the world. New York: Rawson Associates, p. 99], ‘it is the dynamic work team that emerges as the heart of the lean factory’. It is with this bold statement in mind that we seek to explore and develop our conceptual and practical understanding of how teamworking operates under Lean. We examine these issues in the context of a high-profile case of Lean implementation in the UK public sector, the Pacesetter programme of the UK's tax assessment and collection service, Her Majesty's Revenue & Customs (HMRC). We find that although the teams themselves were ostensibly set up on a lean basis, they were largely unable to operate as such as a result of the pressures they faced to meet their work targets. The operation of the teams thus retained, and was shaped by, characteristics of the pre-existing ‘target-based’ mode of teamworking. This, in turn, suggests particular ways in which we might better understand how Lean interacts with the context or environment into which it is introduced. These findings also to some degree run counter to the overwhelmingly negative account of Lean put forward in other recent studies of HMRC [e.g. Carter, B., Danford, A., Howcroft, D., Richardson, H., Smith, A., & Taylor, P. (2013a). Taxing times: Lean working and the creation of (in)efficiencies in HM Revenue and Customs. Public Administration, 91, 83–97]

Lean towards learning: connecting Lean Thinking and human resource management in UK higher education

From its origins in the automotive industry, Lean Thinking is increasingly being seen as a solution to problems of efficiency and quality in other industries and sectors. In recent years attempts have been made to transfer Lean principles and practice to the higher education sector with indications of mixed consequences and debate over its suitability. This paper contributes to the debate by drawing evidence from thirty-four interviews conducted across two UK universities that have implemented Lean in some of their activities and we pay particular attention to the role of the HR function in facilitating its introduction. The findings suggest there are problems in understanding, communicating and transferring Lean Thinking in the higher education context; that, despite HR systems being vital facets of Lean, HR professionals are excluded from participation; and that as a consequence the depth and breadth of Lean application in the two institutions is very limited

How do they do it? Understanding back office efficiency savings made by English councils

Purpose – The purpose of this paper is to illustrate the back office efficiency savings made by English councils during the 2004 Spending Review (SR04) period in order to consider the relationship between service delivery, audit and inspection and, efficiency programmes in local government. It considers three research questions: the use of secondary data, the relationship between efficiency savings and contextual factors, and the influence of audit and inspection in delivering efficient public services. Design/methodology/approach – Through statistical analysis the paper discusses the secondary analysis of publicly available sets of administrative data about local councils in England. These datasets are the annual efficiency statements (AES) taken from records made by each council. The paper discusses through the analysis of the AES the degree of efficiency savings and service improvements in English councils and whether efficiency savings are influenced by internal or external contextual factors. Findings – The paper illustrates that secondary data is a useful source of data, but finds that although councils have achieved the efficiency savings set there is no relationship with the contextual factors. The paper considers the influence of audit and inspection, suggesting that the focus has been on meeting the target rather than local needs. Originality/value – This paper aims to contribute to the debate regarding the use of performance indicators, audit and inspection and efficiency achievement within local government. The paper starts to explore the implication in the UK where, after a decade of use, the influence of these is reducing dramatically

Lean in healthcare: The unfilled promise?

In an effort to improve operational efficiency, healthcare services around the world have adopted process improvement methodologies from the manufacturing sector, such as Lean Production. In this paper we report on four multi-level case studies of the implementation of Lean in the English NHS. Our results show that this generally involves the application of specific Lean ‘tools’, such as ‘kaizen blitz’ and ‘rapid improvement events’, which tend to produce small-scale and localised productivity gains. Although this suggests that Lean might not currently deliver the efficiency improvements desired in policy, the evolution of Lean in the manufacturing sector also reveals this initial focus on the ‘tool level’. In moving to a more system-wide approach, however, we identify significant contextual differences between healthcare and manufacturing that result in two critical breaches of the assumptions behind Lean. First, the customer and commissioner in the private sector are the one and the same, which is essential in determining ‘customer value’ that drives process improvement activities. Second, healthcare is predominantly designed to be capacity-led, and hence there is limited ability to influence demand or make full use of freed-up resources. What is different about this research is that these breaches can be regarded as not being primarily ‘professional’ in origin but actually more ‘organisational’ and ‘managerial’ and, if not addressed could severely constrain Lean’s impact on healthcare productivity at the systems level

A classification model of the lean barriers and enablers: a case from Brazilian healthcare

Lean is widely known as an approach to improve the process, reducing wastes and adding value to the customer. However, around 70% of the lean projects fail during its journey, this situation is related to barriers and enablers to implement lean projects. Thus, this paper aims to analyse and classify lean barriers and enablers into an organizational model. The methodology is based on systematic literature review as well as a case study. The paper presents a classification model into seven organizational aspects as well as propositions related to patient’s behaviour and the public healthcare system