Phase protection system for ac power lines

The system described provides protection for phase sensitive loads from being or remaining connected to ac power lines whenever a phase reversal occurs. It comprises a solid state phase detection circuit, a dc power relay circuit, an ac-to-dc converter for energizing the relay circuit, and a bistable four terminal transducer coupled between the phase detection circuit and the power relay circuit, for controlling both circuits

Thermally induced electroconvection

Thermally induced electroconvection by using thermal gradient and dc electric field on poorly conducting flui

Identity principles in the digital age: a closer view

Identity and its management is now an integral part of web-based services and applications. It is also a live political issue that has captured the interest of organisations, businesses and society generally. As identity management systems assume functionally equivalent roles, their significance for privacy cannot be underestimated. The Centre for Democracy and Technology has recently released a draft version of what it regards as key privacy principles for identity management in the digital age. This paper will provide an overview of the key benchmarks identified by the CDT. The focus of this paper is to explore how best the Data Protection legislation can be said to provide a framework which best maintains a proper balance between 'identity' conscious technology and an individual's expectation of privacy to personal and sensitive data. The central argument will be that increased compliance with the key principles is not only appropriate for a distributed privacy environment but will go some way towards creating a space for various stakeholders to reach consensus applicable to existing and new information communication technologies. The conclusion is that securing compliance with the legislation will prove to be the biggest governance challenge. Standard setting and norms will go some way to ease the need for centralised regulatory oversight

All or nothing: this is the question? The application of article 3(2) Data Protection Directive 95/46/EC to the Internet

The Data Protection Directive 95/46/EC (hereinafter the “Directive”) was passed in 1995 to harmonise the national data protection laws within the European Community with the aim of protecting the fundamental rights and freedoms of individuals including their privacy as set out under Art. 1 of the Data Protection Directive. The rules governing the processing of personal data are deemed to be inapplicable in the two instances outlined by Art.3(2). Processing of personal data taking place as part of activities falling outside of Community law are excluded from the DPD. The Directive is also deemed to be inapplicable if the processing of personal data is undertaken by a natural person in the course of a purely personal or household activity. It is the second part of Art. 3(2), which is examined in more detail. The ruling by the European Court of Justice in Lindqvist provides us with a fresh opportunity to re-examine whether the policy justifications for the exclusion under Art 3(2) continue to remain relevant in the light of widespread use of new technologies such as blogs, podcasts and web pages for processing and distributing information. Greater clarity regarding the implication of new communication technologies for DPD policy is necessary if the laws on data protection are to evolve in a coherent and principled manner

Effect of cloud on UVA and exposure to humans

The daily autumn and winter UVA exposures and 6-minute UVA irradiance data for a Southern Hemisphere, subtropical site (Toowoomba, Australia, 27.6 S, 151.9 E) are presented. This data is used to quantify the effect of cloud on UVA using an integrated sky-camera and radiation system. Additionally, an estimate of the effect of enhanced UVA exposure on humans is made. The measurement system consisted of broadband visible-infrared and UVA sensors together with a sun tracking, wide-angle video camera. The mean daily June exposure was found to be 409 kJm-2. Under the constraints of the uncertainty of both the UVA measurement system and clear-sky model, one case of enhanced UVA irradiance was found. Three cases of cloud enhancement of daily UVA exposure, approaching clear-sky levels, were also determined using a calculated clear-sky envelope. It was also determined that for a fulltime outdoor worker, the additional UVA exposure could approach approximately that of one third of a full winter's day. For indoor workers with an outside lunch break of noon to 1 pm, the additional UVA exposure was on average 6.9 kJm-2 over three cloud enhanced days. To the authors' knowledge this is the first paper to present some evidence of cloud enhanced UVA human exposure