Laser optical disk position encoder with active heads

An angular position encoder that minimizes the effects of eccentricity and other misalignments between the disk and the read stations by employing heads with beam steering optics that actively track the disk in directions along the disk radius and normal to its surface is discussed. The device adapts features prevalent in optical disk technology to the application of angular position sensing

Telemetering and telecommunications research

The research center activities during the reporting period have been focused in three areas: (1) developing the necessary equipment and test procedures to support the testing of 8PSK-TCM through TDRSS from the WSGT; (2) extending the theoretical decoder work to higher speeds with a design goal of 600MBPS at 2 bits/Hz; and (3) completing the initial phase of the CPFSK Multi-H research and determining what subsets (if any) of these coding schemes are useful in the TDRSS environment. The equipment for the WSGT TCM testing has been completed and is functioning in the lab at NMSU. Measured results to date indicate that the uncoded system with the modified HRD and NMSU symbol sync operates at 1 to 1.5 dB from theory when processing encoded 8PSK. The NMSU pragmatic decoder when combined with these units produces approximately 2.9 dB of coding gain at 10(exp -5) BER. Our study of CPFSK with Multi-H coding has reached a critical stage. The principal conclusions reached in this activity are: (1) no scheme using Multi-H alone investigated by us or found in the literature produces power/bandwidth trades that are as good as TCM with filtered 8PSK; (2) when Multi-H is combined with convolutional coding, one can obtain better coding gain than with Multi-H alone but still no better power/bandwidth performance than TCM and these gains are available only with complex receivers; (3) the only advantage we can find for the CPFSK schemes over filtered MPSK with TCM is that they are constant envelope (however, constant envelope is of no benefit in a multiple access channel and of questionable benefit in a single access channel since driving the TWT to saturation in this situation is generally acceptable); and (4) based upon these results the center's research program will focus on concluding the existing CPFSK studies

Remember the future? The Communist Manifesto as historical and cultural form.

With the disappearance of the horizon of proletarian revolution, and the retreat to the spirit world of the famous 'spectre' of communism, the text has undergone a profound transformation. In short, the Manifesto appears to have been transformed from an eschatological tour de force, in which the end of capitalism was assured ('What the bourgeoisie...produces, above all, is its own gravediggers'), into what Marshall Berman has notoriously described as a 'lyrical celebration of bourgeois works': a celebration, more specifically, of the revolutionary temporality of capitalism; a capitalism which - without a fundamental countervailing force - appears now as open-ended. From the standpoint of the philosophy of history, communism as the eschatological absolute has given way to the 'bad infinity' of capitalism - 'the affirmation as negation of the finite' - capitalism without end, amen. Or at least, so it would seem. But does the rest of the Manifesto belong unambiguously to a shape of life grown old? Or is there another sense in which it is still a 'living' text, after the fall of historical communism? Is there, perhaps, new life in it today? What lives in the Communist Manifesto? In particular - and this is the question I shall address here - what is the temporal character of its address to us, citizen-subjects of Western capitalist democracies? How does it inscribe us into historical time, today

Aesthetic autonomy and the crisis of theory: Greenberg, Adorno and the problem of postmodernism in the visual arts

If aesthetic theory has substance only to the extent to which it reflects the historical development of its subject, it is, I think, fair to say that there is at present no satisfactory contemporary aesthetic of the visual arts. Both the sheer formal diversity of the art of the last twenty years and certain of the unifying tendencies which it has none the less come to display, have so undermined the basic presuppositions and parameters of judgement of the aesthetics of modernism as to throw into doubt, not merely the continuing validity of this aesthetic as an historically specific manifestation of the aesthetic theory of modernity, but the very idea of 'aesthetics' itself as an independent or autonomous theoretical sphere. Aesthetic theory, it is increasingly suggested, at least in the form in which it existed from the Enlightenment up until its culmination in the high modernist formalism of the 1950s and early 1960s, is at an end. Current aesthetic theory registers its contemporaneity through its crisis

Infinite exchange: the social ontology of the photographic image.

This paper approaches the problem of the ontology of the photographic image ‘post-digitalization’ historically, via a conception of photography as the historical totality of photographic forms. It argues, first, that photography is not best understood as a particular art or medium, but rather in terms of the form of the image it produces; second, that the photographic image is the main social form of the digital image (the current historically dominant form of the image in general); and third, that there is no fundamental ontological distinction regarding indexicality between photographically generated digital images and those of chemically based photography. ‘The anxiety about the real’ produced by digital imagery has its origins elsewhere, in the ontological peculiarities of the social form of value in societies based on relations of exchange. Distinguishing between the ‘event of capture’ and the ‘event of visualization’, it is argued that it is in its potential for an infinite multiplication of visualizations that the distinctiveness of the digital image lies. In the digital image, the infinite possibilities for social exchange generated by the abstraction of value from use finds an equivalent visual form

Phosphorylation of survivin at threonine 34 inhibits its mitotic function and enhances its cytoprotective activity

Survivin is an essential chromosomal passenger protein required for mitotic progression. It is also an inhibitor of apoptosis and can prevent caspase-mediated cell death. In addition, survivin levels are elevated in cancer cells where its presence correlates with increased resistance to chemo- and radio-therapy, which makes it an attractive target for novel anti-cancer strategies. Interestingly, survivin is phosphorylated by the mitotic kinase, cdk1, and a non-phosphorylatable form, survivin(T34A), cannot inhibit apoptosis. Here we rigorously test the ability of survivin(T34A) and its corresponding phosphomimetic, survivin(T34E), to promote cell viability through survivin's dual roles. The effects of these mutations are diametrically opposed: survivin(T34A) accelerates cell proliferation and promotes apoptosis, whereas survivin(T34E) retards growth and promotes survival. Thus the phosphorylation status of survivin at T34 is pivotal to a cell's decision to live or die

The innovative capacity of voluntary organisations and the provision of public services: A longitudinal approach

The prior history of voluntary and community organisations (VCOs) as pioneers of public services during the late nineteenth and early twentieth century has lead to reification of the innovativeness of these organisations. Is this reification justified – are VCOs inherently innovative, or is innovation contingent on other factors? This paper reports on a longitudinal study of this capacity conducted over 1994 – 2006. This study finds that the innovative capacity of VCOs is in fact not an inherent capacity but rather is contingent upon the public policy framework that privileges innovation above other activity of VCOs. The implications of this for theory, policy and practice are considered

The Computer Science Ontology: A Large-Scale Taxonomy of Research Areas

Ontologies of research areas are important tools for characterising, exploring, and analysing the research landscape. Some fields of research are comprehensively described by large-scale taxonomies, e.g., MeSH in Biology and PhySH in Physics. Conversely, current Computer Science taxonomies are coarse-grained and tend to evolve slowly. For instance, the ACM classification scheme contains only about 2K research topics and the last version dates back to 2012. In this paper, we introduce the Computer Science Ontology (CSO), a large-scale, automatically generated ontology of research areas, which includes about 26K topics and 226K semantic relationships. It was created by applying the Klink-2 algorithm on a very large dataset of 16M scientific articles. CSO presents two main advantages over the alternatives: i) it includes a very large number of topics that do not appear in other classifications, and ii) it can be updated automatically by running Klink-2 on recent corpora of publications. CSO powers several tools adopted by the editorial team at Springer Nature and has been used to enable a variety of solutions, such as classifying research publications, detecting research communities, and predicting research trends. To facilitate the uptake of CSO we have developed the CSO Portal, a web application that enables users to download, explore, and provide granular feedback on CSO at different levels. Users can use the portal to rate topics and relationships, suggest missing relationships, and visualise sections of the ontology. The portal will support the publication of and access to regular new releases of CSO, with the aim of providing a comprehensive resource to the various communities engaged with scholarly data