Multiple-orifice throttle valve

Multiple-orifice throttle valve is not subject to cold welding in a vacuum environment and is compatible with strong oxidizing fluid. The valve is of all metal construction using simple components that do not slide or rotate and excludes static or dynamic seals

Multiple orifice throttle valve Patent

Throttle valve for regulating fluid flow volum

Poking fun at the surface: exploring touch-point overloading on the multi-touch tabletop with child users

In this paper a collaborative game for children is used to explore touch-point overloading on a multi-touch tabletop. Understanding the occurrence of new interactional limitations, such as the situation of touch-point overloading in a multi-touch interface, is highly relevant for interaction designers working with emerging technologies. The game was designed for the Microsoft Surface 1.0 and during gameplay the number of simultaneous touch-points required gradually increases to beyond the physical capacity of the users. Studies were carried out involving a total of 42 children (from 2 different age groups) playing in groups of between 5-7 and all interactions were logged. From quantitative analysis of the interactions occurring during the game and observations made we explore the impact of overloading and identify other salient findings. This paper also highlights the need for empirical evaluation of the physical and cognitive limitations of interaction with emerging technologies

Smart objects as building blocks for the internet of things

The combination of the Internet and emerging technologies such as nearfield communications, real-time localization, and embedded sensors lets us transform everyday objects into smart objects that can understand and react to their environment. Such objects are building blocks for the Internet of Things and enable novel computing applications. As a step toward design and architectural principles for smart objects, the authors introduce a hierarchy of architectures with increasing levels of real-world awareness and interactivity. In particular, they describe activity-, policy-, and process-aware smart objects and demonstrate how the respective architectural abstractions support increasingly complex application

In advance of a broken attestant, or where is art’s critical subject?

Two concurrent understandings of criticality in art assign it as a potential property of artworks themselves, or bemoan it as lacking in art’s audiences. This division can be traced to its roots in the Romantic conception of criticality, in which the critical procedure completes an unfinished work. This act of completion, and an accompanying conception of transformatory potential, is generally held to occur in the presence of a primary audience: an idea that is undermined by recent attributions of critical force to non-present secondary audiences. This article traces these orientations of thought as they structure recent approaches to practice, then offers an example of a mode of practice that refuses to attribute any critical or transformatory capacity to either its original material effects or a primary audience. Any critical or transformatory force is played out as the work propagates and adjusts itself in its afterlife

An examination of regge cut models in high energy scattering processes

A phenomenolgical analysis of t-m body scattering data with particular emphasis on the phase and energy dependence overegged cut corrections is presented. After a brief summary of the Regge philosophy and approach, we survey the experimental data in chapter two. We note that all hadronic processes, as distinct from photoproduction appear to exhibit strong Regge shrinkage at large |t|. In chapter three, we motivate the eikonal model approach and show how it is used to calculate cuts in π N charge exchange and in photoproduction. Most of the phase problems encountered in the naive absorption models can be overcome, provided we use the true elastic amplitude (which we represent as a sum of P + P’ poles) to generate the absorptive corrections. We conclude this chapter by discussing how the shrinkage of the eikonal model cuts is inconsistent with the α(_eff)’s of chapter two for hadronic processes. We digress a little in chapter four to examine the important role played by t-channel unitarity and show how it can solve some of the problems outlined in the previous chapter by peaking the cut discontinuity at the position of the pole. Finally, we propose a new scheme for calculating Regge cuts and in the last chapter construct a specific model for π N CEX and π º photoproduction. A detailed examination of the cut discountinuity provides a possible explanation for the different energy dependence of these ostensibly similar processes. In conclusion, we discuss the implications of our model for the traditional (Michigan and Argonne) approaches to Regge cut phenomenology and suggest some areas which may provide interesting tests of the model

Constructing the Cool Wall: A Tool to Explore Teen Meanings of Cool

This paper describes the development and exploration of a tool designed to assist in investigating ‘cool’ as it applies to the design of interactive products for teenagers. The method involved the derivation of theoretical understandings of cool from literature that resulted in identification of seven core categories for cool, which were mapped to a hierarchy. The hierarchy includes having of cool things, the doing of cool activities and the being of cool. This paper focuses on a tool, the Cool Wall, developed to explore one specific facet of the hierarchy; exploring shared understanding of having cool things. The paper describes the development and construction of the tool, using a heavily participatory approach, and the results and analysis of a study carried out over 2 days in a school in the UK. The results of the study both provide clear insights into cool things and enable a refined understanding of cool in this context. Two additional studies are then used to identify potential shortcomings in the Cool Wall methodology. In the first study participants were able to populate a paper cool wall with anything they chose, this revealed two potential new categories of images and that the current set of images covered the majority of key themes. In the second study teenagers interpretations of the meaning of the images included in the Cool Wall were explored, this showed that the majority of meanings were as expected and a small number of unexpected interpretations provided some valuable insights

Pushing the Boat Out: A study of spatial organisation and harbour spaces in the early Swahili ports of the Zanzibar Archipelago, 550-1100 CE

The aim of this thesis is to identify maritime activity and patterns of spatial organisation through archaeological survey at first millennium coastal settlements in the Zanzibar Archipelago, in order to explore the nature of proto-Swahili harbours and evaluate the role of maritime activity as a component of proto-Swahili settlement in the region. Despite frequent scholarly reference to the maritime cultural identity of the Swahili there has been little consideration of the maritime archaeology of first millennium East African coastal settlements. Although intertidal zones associated with later sites have been surveyed, no investigation has ever been conducted into the nature of proto-Swahili harbours. The work presents an inductive investigation of proto-Swahili harbours between the sixth and eleventh centuries in the Zanzibar Archipelago, based on observations of industrial and maritime activity in open areas along the shorelines of Swahili ports. This thesis focuses on the geophysical survey, GIS analysis, and evaluation of the maritime areas of three contemporary sites; Unguja Ukuu (c. 600-1100 CE) and Fukuchani (c. 550-800 CE) on Zanzibar, and Tumbe (c. 600-950 CE) on Pemba. The analysis demonstrates the existence of communal harbourfront activity areas hosting iron-working, crafting, and trade, and a previously unknown shoreline mosque. The comparison of the three sites indicates a pattern of maritime activity and settlement organisation in the Zanzibar Archipelago based on knowledgeable exploitation of the maritime cultural landscape. It is argued that the proto-Swahili coastal settlements of the Zanzibar Archipelago were deliberately located on beaches with shallow, sheltered harbours and convenient land-sea access in order to exploit the near-shore coastscape. Maritime activity therefore appears to have been an important component of proto-Swahili settlement from the earliest phases of permanent occupation, whilst the construction of shoreline mosques in the ninth century reflects the development of a syncretic maritime-Islamic coastal Swahili identity

Supporting the Mobile In-situ Authoring of Locative Media in Rural Places: Design and Expert Evaluation of the SMAT app

Providing users with carefully authored Locative media experiences (which can be consumed via their GPS equipped smartphones or tablets) has significant potential for fostering a strong engagement with their current surroundings. However, the availability of mobile tools to support the authoring of locative media experiences in-situ, and by non-technical users, remains scarce. In this article we present the design and field-trial expert evaluation of a mobile app developed under the SHARC project (Investigating Technology Support for the Shared Curation of Local History in a Rural Community). The app is named SMAT (SHARC Mobile Authoring Tool) and supports the authoring of Locative Media experiences with a focus on the creation of POIs (Points of Interest) and associated geo-fences which trigger the pushed delivery of media items such as photos, audio clips, etc. One important requirement of SMAT is the ability to support authoring in places where connectivity is intermittent or unavailable, e.g. many rural areas