Projective toric varieties as fine moduli spaces of quiver representations

This paper proves that every projective toric variety is the fine moduli space for stable representations of an appropriate bound quiver. To accomplish this, we study the quiver $Q$ with relations $R$ corresponding to the finite-dimensional algebra $\bigl(\bigoplus_{i=0}^{r} L_i \bigr)$ where $\mathcal{L} := (\mathscr{O}_X,L_1, ...c, L_r)$ is a list of line bundles on a projective toric variety $X$. The quiver $Q$ defines a smooth projective toric variety, called the multilinear series $|\mathcal{L}|$, and a map $X \to |\mathcal{L}|$. We provide necessary and sufficient conditions for the induced map to be a closed embedding. As a consequence, we obtain a new geometric quotient construction of projective toric varieties. Under slightly stronger hypotheses on $\mathcal{L}$, the closed embedding identifies $X$ with the fine moduli space of stable representations for the bound quiver $(Q,R)$.Comment: revised version: improved exposition, corrected typos and other minor change

The Monetary Transmission Mechanism in The United Kingdom: Pass-Through & Policy Ru

A number of recent papers have used policy simulations from small empirical macro models to assess the efficacy of inflation-forecast targeting. The macro models used to undertake the simulations differ significantly with the assumed degree of openness, an important factor for the analysis. However, the open economy models typically approach the pass-through from exchange rate to import prices and ultimately retail prices in a stylized manner, assuming full and instantaneous pass-through. This paper modifies the open economy macro model presented in Batini and Haldane (1999) to accommodate a variety of pass-through representations, considering time and state-(cycle)-dependent pass-through rules. While the model’s dynamics are affected, the main result of Batini and Haldane – that targeting an inflation forecast dominates targeting current inflation – is robust to the assumed rate of pass-through.

World Bank lending for education research, 1982-89

As a follow up to the earlier review of research in education projects, this study inventories research in education projects, 1982 to 1989, and traces the completion status of studies that were incomplete before 1982. Data were collected on research volume, cost and the conditions under which research components yield accessible and useful information. This paper describes the strategy employed to identify the research components and studies. It presents findings with respect to: (i) the volume of studies and compares these results with the earlier study; (ii) the type of studies reported; and (iii) the budgeted cost of the studies. It also examines preconditions of study completion, using data from Staff Appraisal Reports (SARs) and interviews with selected Project Officers. The final section discusses the findings and draws conclusions.Teaching and Learning,Health Monitoring&Evaluation,ICT Policy and Strategies,Agricultural Knowledge&Information Systems,Poverty Monitoring&Analysis

New Zealand information on the Internet: the Power to Find the Knowledge

In a world of apparently ubiquitous information, does knowledge still equal power? Whatever the answer to this question, we will not have power unless we can retrieve our knowledge. Despite the advances of the last decades, issues remain in finding information on the Web relating to Aotearoa. These include: the efficiency with which the global search engines index the NZ web space, searching for macronised words, the quality of Wikipedia information about NZ, and the availability of open access NZ research

Benchmarking Google Scholar with the New Zealand PBRF Research Assessment Exercise

Google Scholar was used to generate citation counts to the web-based research output of New Zealand Universities. Total citations and hits from Google Scholar correlated with the research output as measured by the official New Zealand Performance-Based Research Fund (PBRF) exercise. The article discusses the use of Google Scholar as a cybermetric tool and methodology issues in obtaining citation counts for institutions. Google Scholar is compared with other tools that provide web citation data: Web of Science, SCOPUS, and the Wolverhampton Cybermetric Crawler

Webometric Evaluation of Institutional Repositories

This research project investigated (a) whether there is a relationship between the Web Impact Factor (WIF) of an institutional repository, and conventional measures of research quality of the institution; and (b) whether a relatively new search engine, Blekko (http://blekko.com/) was a viable tool for webometric investigation. Blekko was used to count links made to the institutional repositories of Australasian universities. The WIF was calculated as the number of inlinks to the repository, divided by the number of documents at the repository. At the time of the research, Blekko's coverage of many of the institutional repositories was inconsistent, so only a subset of the repositories was used in the analysis, and the results are inconclusive. However there appeared to be a small correlation between the WIF of a repository and the QS World Ranking; and for Australian institutions, the WIF of a repository and the institution's ERA score

Issues in "Blogmetrics" - Case Studies Using BlogPulse to Observe Trends in Weblogs

Weblogs ("blogs") have emerged as a significant communication medium. The BlogPulse Trend Search tool was used for a number of case studies, examining trends in the use of terms in blogs. The paper discusses methodology issues in searching blogs, concluding that blogs can indicate new trends in popular culture, language, and science. However interpretation of trends requires careful examination of the postings, to ensure that an apparent trend is not due to problems in terminology, spam, trivial references to the concepts, etc. In particular, there seems to be no easy way to link postings to particular countries

Internet Search Tactics

Purpose Bates' Information Search Tactics have been influential in the practice and teaching of online searching since they were published in 1979. This article is about using information search tactics to search the Internet, and presents a set of tactics useful in the practice and teaching of Internet searching. Design/methodology/approach Tactics used on the Internet were gathered from the literature, websites, and the author's experience of Internet searching. These were compared with the Information Search Tactics, and refined into a set of Internet Search Tactics. Findings The article presents 34 Internet Search Tactics: 18 of the original Bates tactics, interpreted in the context of the Internet, and 16 new tactics. While many of the information search tactics are relevant, effective Internet searching requires recognition of the role of relevancy ranking and full text searching in search engines. The uncontrolled nature of the Internet means that evaluation of information resources is an integral part of Internet searching, so a group of evaluation tactics have been proposed. Practical implications The tactics provide a framework for teaching effective Internet searching. Originality/value Bates' information search tactics do not appear to have been applied as a whole to searching the Internet. The proposed tactics will be useful for librarians and researchers who need to carry out effective searching on the Internet, and for information literacy education. Research into information seeking and search interfaces will be informed by the tactics