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1.
After repetitive potential cycling employing a high positive potential limit (>700 mV wrt Hg/HgO/ KOH) three anodic and one cathodic peak can be observed using aβ-Ni(OH)2 starting material. Anodic peaks found at 425, 470 and 555 mV in 5 mol dm?3 KOH shift to less positive potentials as the alkali concentration is increased appearing at 365, 410 and 455 mV respectively in 12.5 mol dm?3 KOH. Four anodic processes involving various pairs of coexisting phases within both theβ andα-/γ-phase system can be identified as summarized below in order of increasing positive potential: Peak A $$\begin{gathered} Peak A{\text{ }}U_\alpha ^A \to {\text{ }}V_\gamma ^A \hfill \\ Peak B{\text{ }}U_\beta ^B \to {\text{ }}V_\beta ^B \hfill \\ {\text{ }}\mathop C\limits^ + {\text{ }}U_\alpha ^C \to {\text{ }}V_\gamma ^C \hfill \\ Peak E{\text{ }}V_\beta ^B \to {\text{ }}V_\gamma ^E \hfill \\ \end{gathered} $$ Observed shifts in anodic and cathodic peak potentials are consistent with the known influence of alkali and water activity on the reversible potentials for the above processes. 相似文献
2.
Cheating is rampant in current gameplay on the Internet. However, it isn't as well understood as we might expect. The authors summarize the various known methods of cheating and define a taxonomy of online game cheating with respect to the underlying vulnerability, consequence, and cheating principal. This taxonomy provides a systematic introduction to the characteristics of cheats in online games and how they can arise. Although cheating in online games is largely due to various security failures, the four traditional aspects of security—confidentiality, integrity, availability, and authenticity—are insufficient to explain it. Instead, fairness becomes a vital additional aspect, and its enforcement provides a convincing perspective for understanding security techniques' role in developing and operating online games. 相似文献
3.
Rebecca Randell Stephanie Wilson Peter Woodward 《Computer Supported Cooperative Work (CSCW)》2011,20(1-2):37-59
Workplace studies have made a major contribution to the field of CSCW, drawing attention to subtle practices that enable effective collaboration. However, workplace studies typically focus on a single setting, making it difficult to assess the generalisability of the findings. Through a multi-site workplace study, we explore a specific collaborative process, that of the handover which occurs when a patient is transferred from one hospital or ward to another. The study demonstrates that the term ??handover?? captures a variety of collaborative practices that vary in both their form and content, reflecting aspects of the setting in which they occur. Multi-site workplace studies are shown to be essential for CSCW, not only generating findings that have relevance beyond a single setting but also focusing attention on aspects of work practice that may otherwise go unnoticed. 相似文献
4.
As part of the Bristol Wearable Computing Initiative, we are exploring location-sensing systems suitable for use with wearable
computing. In this paper we present our findings, and in particular a wearable application — the ‘Shopping Jacket’ — which
relies on a minimal infrastructure to be effective. We use two positioning devices, ‘pingers’ and GPS. The pinger is used
to signal the presence of a shop, and to indicate the type of shop and its website. The GPS is used to disambiguate which
branch of a high street chain is being passed. The wearable uses this information to determine whether the wearer needs to
be alerted that they are passing an interesting shop, or to direct the wearer around a shopping mall. The Shopping Jacket
integrates a wearable CardPC, GPS and pinger receivers, a near-field radio link, hand-held display, GSM data telephone and
a speech interface into a conventional sports blazer. 相似文献
5.
In this paper we describe continuing work being carried out as part of the Bristol Wearable Computing Initiative. We are
interested in the use of context sensors to improve the usefulness of wearable computers. A CyberJacket incorporating a Tourist Guide application has been built, and we have experimented with location and movement sensing devices
to improve its performance. In particular, we have researched processing techniques for data from accelerometers which enable
the wearable computer to determine the user’s activity. We have experimented with, and review, techniques already employed
by others; and then propose new methods for analysing the data delivered by these devices. We try to minimise the number of
devices needed, and use a single X-Y accelerometer device. Using our techniques we have adapted our CyberJacket and Tourist
Guide to include a multimedia presentation which gives the user information using different media depending on the user’s
activity as well as location. 相似文献
6.
The 12th International Symposium on Wearable Computing (ISWC) was held in Pittsburgh in September 2008. It is one of the longest-running conferences focusing on aspects of pervasive and mobile computing. With over 60 submissions, the program committee selected eight long papers, seven short papers, and nine posters for the conference (a 26 percent acceptance rate for long papers). Sessions, which were presented over two days, covered location mapping, mobile phones and human interfaces, activity recognition, activity support, and power and system integration. 相似文献
7.
A formal model of atomicity in asynchronous systems 总被引:1,自引:0,他引:1
Summary We propose a generalisation of occurrence graphs as a formal model of computational structure. The model is used to define the atomic occurrence of a program, to characterise interference freeness between programs, and to model error recovery in a decentralised system. 相似文献
8.
This paper develops a taxonomy of qualitative spatial relations for pairs of regions, which are all logically defined from two primitive (but axiomatized) notions. The first primitive is the notion of two regions being connected, which allows eight jointly exhaustive and pairwise disjoint relations to be defined. The second primitive is the convex hull of a region which allows many more relations to be defined. We also consider the development of the useful notions of composition tables for the defined relations and networks specifying continuous transitions between pairs of regions. We conclude by discussing what kind of criteria to apply when deciding how fine grained a taxonomy to create. 相似文献
9.
10.
Nutrition labelling of food impacts not only on consumers and the food industry, but on international trade as well. When requirements for food label information are similar among countries, trade is facilitated. Comparisons between recent nutrition labelling regulations issued by the USA and the international guidelines formulated by Codex Alimentarius identify not only challenges to international harmonization that require focused efforts, but also opportunities for increasing international agreement on nutrition labelling. Factors to be considered are the continued benefits of a generalized Codex guideline as well as technical issues including analytical methods, nutrients to be declared, bases for declaration, and reference values. 相似文献