Mechanized Metrics: From Verse Science to Laboratory Prosody, 1880-1918

Post-print version of the article deposited in accordance with SHERPA RoMEO guidelines. Copyright © 2009, Johns Hopkins University Press. This article first appeared in Configurations: A Journal of Literature, Science and Technology Vol.17(3), pp285-308. Reprinted with permission by The Johns Hopkins University Press.From roughly the 1880s, a methodical verse “science” was beginning to assert itself. Gripped by the thought of articulating an objective, fact-based metrics, poetry scientists brought to bear on the traditional verse line principles of observation and later full-blown experimental practices--not to mention a curious array of instrumentation. By the turn of the century, metrical verse was being subjected to a rigorous measurement regime, which employed techniques and apparatus derived from the new disciplines of experimental physiology and psychology. Proponents of this newly mechanized metrics pitched themselves enthusiastically into the turn-of-the-century prosody fray, believing they could resolve, once and for all, some of the fundamental dilemmas of versification

Importance of charge capture in interphase regions during readout of charge-coupled devices

The current understanding of charge transfer dynamics in charge-coupled devices (CCDs) is that charge is moved so quickly from one phase to the next in a clocking sequence and with a density so low that trapping of charge in the interphase regions is negligible. However, simulation capabilities developed at the Centre for Electronic Imaging, which includes direct input of electron density simulations, have made it possible to investigate this assumption further. As part of the radiation testing campaign of the Euclid CCD273 devices, data have been obtained using the trap pumping method, a method that can be used to identify and characterize single defects within CCDs. Combining these data with simulations, we find that trapping during the transfer of charge among phases is indeed necessary to explain the results of the data analysis. This result could influence not only trap pumping theory and how trap pumping should be performed but also how a radiation-damaged CCD is readout in the most optimal way

Postirradiation behavior of p-channel charge-coupled devices irradiated at 153 K

The displacement damage hardness that can be achieved using p-channel charge-coupled devices (CCD) was originally demonstrated in 1997, and since then a number of other studies have demonstrated an improved tolerance to radiation-induced CTI when compared to n-channel CCDs. A number of recent studies have also shown that the temperature history of the device after the irradiation impacts the performance of the detector, linked to the mobility of defects at different temperatures. This study describes the initial results from an e2v technologies p-channel CCD204 irradiated at 153 K with a 10 MeV equivalent proton fluences of 1.24×109 and 1.24×1011 protons cm-2. The dark current, cosmetic quality and the number of defects identified using trap pumping immediately were monitored after the irradiation for a period of 150 hours with the device held at 153 K and then after different periods of time at room temperature. The device also exhibited a flatband voltage shift of around 30 mV / krad, determined by the reduction in full well capacity

Evolution and impact of defects in a p-channel CCD after cryogenic proton-irradiation

P-channel CCDs have been shown to display improved tolerance to radiation-induced charge transfer inefficiency (CTI) when compared to n-channel CCDs. However, the defect distribution formed during irradiation is expected to be temperature dependent due to the differences in lattice energy caused by a temperature change. This has been tested through defect analysis of two p-channel e2v CCD204 devices, one irradiated at room temperature and one at a cryogenic temperature (153K). Analysis is performed using the method of single trap pumping. The dominant charge trapping defects at these conditions have been identified as the donor level of the silicon divacancy and the carbon interstitial defect. The defect parameters are analysed both immediately post irradiation and following several subsequent room-temperature anneal phases up until a cumulative anneal time of approximately 10 months. We have also simulated charge transfer in an irradiated CCD pixel using the defect distribution from both the room-temperature and cryogenic case, to study how the changes affect imaging performance. The results demonstrate the importance of cryogenic irradiation and annealing studies, with large variations seen in the defect distribution when compared to a device irradiated at room-temperature, which is the current standard procedure for radiation-tolerance testing

Retrieving fin-de-siècle women poets: the transformative myths, fragments and voices of Webster, Blind and Levy

The critical recuperation of late nineteenth-century women poets, most still waiting in the margins of the literary canon, has owed significantly to the renovated interest and study of the poetical works of Augusta Webster, Mathilde Blind and Amy Levy (1860-90) by the postmodern reader. One of the reasons for this ‘salvage’ may be that they represent and embody the profound and extraordinary changes encompassing the British fin-de-siècle, in which the transition from the Victorians to the Moderns implied the transformation or reconfiguration of certain myths or (hi)stories and the critical re-use or ‘recycling’ of major literary forms. If, for Webster and Blind, involvement in radical politics (namely, feminism and socialism) certainly implied a stance as outsiders, Blind and Levy were even more set apart by their foreignness, with Levy’s different religion and sexuality increasing the distance even further. With recourse to close reading and cultural critique, this paper will analyse how these three women poets re-use fragments (‘verbal ruins’) of national and international history, as well as classic myth, in order to question and transform the images and representations of man and woman in their respective connections with the world. It will demonstrate that while Webster’s poetry (Dramatic Studies of 1866 and Portraits of 1870) is firmly grounded on social demands and the exploration and dramatization of the nature of female experience, Blind’s epic and dramatic verse (The Ascent of Man of 1889 and Dramas in Miniature of 1891) creates new myths of human destiny, reclaiming the Poet’s role as the singer of the age’s scientific deeds, and Levy’s lyrics (Xantippe of 1881 and A Minor Poet of 1884) signal the New Woman poet’s role as victim of the pressures of emancipation. With the support of critics as Isobel Armstrong, Helen Groth and Angela Leighton, the paper will furthermore discuss the way in which these poets explore the selves that women inherit and create and the languages that re-define them, often through the expansive, public forms of dramatic and narrative verse; through these hybrid and fragmentary forms, Webster, Blind and Levy literally give voice to unspeakable feelings and situations, in which the anomalous and marginal are made central.info:eu-repo/semantics/acceptedVersio

Post-transcriptional regulation of satellite cell quiescence by TTP-mediated mRNA decay.

Skeletal muscle satellite cells in their niche are quiescent and upon muscle injury, exit quiescence, proliferate to repair muscle tissue, and self-renew to replenish the satellite cell population. To understand the mechanisms involved in maintaining satellite cell quiescence, we identified gene transcripts that were differentially expressed during satellite cell activation following muscle injury. Transcripts encoding RNA binding proteins were among the most significantly changed and included the mRNA decay factor Tristetraprolin. Tristetraprolin promotes the decay of MyoD mRNA, which encodes a transcriptional regulator of myogenic commitment, via binding to the MyoD mRNA 3' untranslated region. Upon satellite cell activation, p38α/β MAPK phosphorylates MAPKAP2 and inactivates Tristetraprolin, stabilizing MyoD mRNA. Satellite cell specific knockdown of Tristetraprolin precociously activates satellite cells in vivo, enabling MyoD accumulation, differentiation and cell fusion into myofibers. Regulation of mRNAs by Tristetraprolin appears to function as one of several critical post-transcriptional regulatory mechanisms controlling satellite cell homeostasis

Comparing simulations and test data of a radiation damaged charge-coupled device for the Euclid mission

The visible imager instrument on board the Euclid mission is a weak-lensing experiment that depends on very precise shape measurements of distant galaxies obtained by a large charge-coupled device (CCD) array. Due to the harsh radiative environment outside the Earth’s atmosphere, it is anticipated that the CCDs over the mission lifetime will be degraded to an extent that these measurements will be possible only through the correction of radiation damage effects. We have therefore created a Monte Carlo model that simulates the physical processes taking place when transferring signals through a radiation-damaged CCD. The software is based on Shockley–Read–Hall theory and is made to mimic the physical properties in the CCD as closely as possible. The code runs on a single electrode level and takes the three-dimensional trap position, potential structure of the pixel, and multilevel clocking into account. A key element of the model is that it also takes device specific simulations of electron density as a direct input, thereby avoiding making any analytical assumptions about the size and density of the charge cloud. This paper illustrates how test data and simulated data can be compared in order to further our understanding of the positions and properties of the individual radiation-induced traps

Determination of <i>in situ</i> trap properties in CCDs using a "single-trap pumping" technique

The science goals of space missions from the Hubble Space Telescope through to Gaia and Euclid require ultraprecise positional, photometric, and shape measurement information. However, in the radiation environment of the space telescopes, damage to the focal plane detectors through high-energy protons leads to the creation of traps, a loss of charge transfer efficiency, and a consequent deterioration in measurement accuracy. An understanding of the traps produced and their properties in the CCD during operation is essential to allow optimization of the devices and suitable modeling to correct the effect of the damage through the postprocessing of images. The technique of “pumping single traps” has allowed the study of individual traps in high detail that cannot be achieved with other techniques, such as deep level transient spectroscopy, whilst also locating each trap to the subpixel level in the device. Outlining the principles used, we have demonstrated the technique for the A-center, the most influential trap in serial readout, giving results consistent with the more general theoretical values, but here showing new results indicating the spread in the emission times achieved and the variation in capture probability of individual traps with increasing signal levels. This technique can now be applied to other time and temperature regimes in the CCD to characterize individual traps in situ under standard operating conditions such that dramatic improvements can be made to optimization processes and modeling techniques