Spartan Daily, February 27, 1962

Volume 49, Issue 72https://scholarworks.sjsu.edu/spartandaily/4259/thumbnail.jp

Vacuum field energy and spontaneous emission in anomalously dispersive cavities

Anomalously dispersive cavities, particularly white light cavities, may have larger bandwidth to finesse ratios than their normally dispersive counterparts. Partly for this reason, their use has been proposed for use in LIGO-like gravity wave detectors and in ring-laser gyroscopes. In this paper we analyze the quantum noise associated with anomalously dispersive cavity modes. The vacuum field energy associated with a particular cavity mode is proportional to the cavity-averaged group velocity of that mode. For anomalously dispersive cavities with group index values between 1 and 0, this means that the total vacuum field energy associated with a particular cavity mode must exceed $\hbar \omega/2$. For white light cavities in particular, the group index approaches zero and the vacuum field energy of a particular spatial mode may be significantly enhanced. We predict enhanced spontaneous emission rates into anomalously dispersive cavity modes and broadened laser linewidths when the linewidth of intracavity emitters is broader than the cavity linewidth.Comment: 9 pages, 4 figure

Vacuum field energy and spontaneous emission in anomalously dispersive cavities

Anomalously dispersive cavities, particularly white light cavities, may have larger bandwidth to finesse ratios than their normally dispersive counterparts. Partly for this reason, their use has been proposed for use in LIGO-like gravity wave detectors and in ring-laser gyroscopes. In this paper we analyze the quantum noise associated with anomalously dispersive cavity modes. The vacuum field energy associated with a particular cavity mode is proportional to the cavity-averaged group velocity of that mode. For anomalously dispersive cavities with group index values between 1 and 0, this means that the total vacuum field energy associated with a particular cavity mode must exceed $\hbar \omega/2$. For white light cavities in particular, the group index approaches zero and the vacuum field energy of a particular spatial mode may be significantly enhanced. We predict enhanced spontaneous emission rates into anomalously dispersive cavity modes and broadened laser linewidths when the linewidth of intracavity emitters is broader than the cavity linewidth.Comment: 9 pages, 4 figure

FIRM MANAGEMENT, STRATEGY, RESOURCES, AND PRESENCE ON THE WEB

This paper examines the variables associated with a firm having a site on the World Wide Web and with the site's characteristics. We predict that company leadership and strategy, firm resources and the need to communicate with the public are associated with the presence of Web sites and their characteristics. To test the predictions, we use data from the Business Week 1000 largest firms in the US., two year's of chairmans' annual report letters, and a survey of Web sites. The results show that firm leadership and strategy is the strongest predictor of having a Web site and its characteristics. Firm resources and the need to communicate are also positively associated with Web sites. The presence of a Web site and its evaluation appear to be independent of industry classification. We explore the implications of the results for firm strategy toward the adoption of technological innovations.Information Systems Working Papers Serie

Datalog as a parallel general purpose programming language

The increasing available parallelism of computers demands new programming languages that make parallel programming dramatically easier and less error prone. It is proposed that datalog with negation and timestamps is a suitable basis for a general purpose programming language for sequential, parallel and distributed computers. This paper develops a fully incremental bottom-up interpreter for datalog that supports a wide range of execution strategies, with trade-offs affecting efficiency, parallelism and control of resource usage. Examples show how the language can accept real-time external inputs and outputs, and mimic assignment, all without departing from its pure logical semantics

Causes of Conflict Between Niger Delta Communities (2003 –2014)

The thesis evaluates the causality of inter-community conflict in the Niger Delta, notably in the core states of Bayelsa, Delta and Rivers. In contrast to previous studies, this research uses its own detailed definition and delineation of Niger Delta Communities (NDCs), and the nature of inter-community conflict, to determine the social, economic and political factors that cause conflict between communities in the ND. A further key distinction between this study and previous research on the causality of conflict in the Niger Delta is the use of evidence and data gathered from leaders and residents involved first-hand in the conflict in the region. The study defines NDCs as inherently autonomous entities, since they were politically autonomous prior to colonisation. Non-native means of administration first introduced by European colonisers constrained these community’s autonomy, most recently under the system of Local Government Areas (LGAs). Corruption and mismanagement in local administration has alienated NDCs who mostly no longer trust the LGAs and have fallen back on traditional means of interacting with their neighbours which can involve the use of violent conflict to settle disputes. Hence, at the heart of inter-community conflict in the Niger Delta is the tension between the ‘traditional’ represented by the NDCs’ inherent autonomy and ancient practices and the ‘modern’ represented by the LGAs’ constitutional authority. The current constitutional administrative system in the Niger Delta blurs community autonomy and forces communities to interact in the geographical, political and legal space created by the LGA. The inability of LGA’s to provide adequate social, economic and political ‘goods’ for their citizens creates an environment where interaction between NDCs often involves competition for access to these goods leading to disputes which are often settled using traditional violent means