58,892 research outputs found
‘For recuperation’: elegy, form, and the aleatory in B.S. Johnson's The Unfortunates
B.S. Johnson's The Unfortunates (1969) is British fiction's predominant attempt to embrace aleatorism and to subvert linear causality: the chapters are unbound, and the text invites the reader to shuffle them before reading. Narrative can be understood as a means of containing the ever-present risk of death, of disease, of loss, and has as its impetus a curative trajectory: recuperation is, perhaps, implicit in narrative. The Unfortunates, however, defiantly refuses such comfort. Johnson, this essay asserts, uses his form to cancel the consolations of narrative construction, taking the infectious chains of narrative and repudiating any doctorial/authorial urge to trace the spread of disease/narrative. The anti-linear narrative is inextricable from the type of mourning it enacts, and from the aetiology of the disease that it displays, but declines to track: a type of mourning that refuses movement through time, and the story of a disease that refuses to certify its own development. These refusals, I suggest, are embedded in the grammar and syntax of Johnson's prose. In The Unfortunates the full stops are nodal points of anxiety and loss, an expression of the novel's mortal anxiety. Johnson's final, missing full stop, the novel's aterminal terminus, offers a defiant refusal of recuperation of any kind
Testing Luminescence Dating Methods for Small Samples from Very Young Fluvial Deposits
The impetus behind this study is to understand the sedimentological dynamics of very young fluvial systems in the Amazon River catchment and relate these to land use change and modern analogue studies of tidal rhythmites in the geologic record. Initial quartz optically stimulated luminescence (OSL) dating feasibility studies have concentrated on spit and bar deposits in the Rio Tapajós. Many of these features have an appearance of freshly deposited pristine sand, and these observations and information from anecdotal evidence and LandSat imagery suggest an apparent decadal stability. The characteristics of OSL from small (~5 cm) sub-samples from ~65 cm by ~2 cm diameter vertical cores are quite remarkable. Signals from medium-sized aliquots (5 mm diameter) exhibit very high specific luminescence sensitivity, have excellent dose recovery and recycling, essentially independent of preheat, and show minimal heat transfer even at the highest preheats. These characteristics enable measurement of very small signals with reasonable precision and, using modified single-aliquot regenerative-dose (SAR) approaches, equivalent doses as low as ~4 mGy can be obtained. Significant recuperation is observed for samples from two of the study sites and, in these instances, either the acceptance threshold was increased or growth curves were forced through the origin; recuperation is considered most likely to be a measurement artefact given the very small size of natural signals. Dose rates calculated from combined inductively coupled plasma mass spectrometry/inductively coupled plasma optical emission spectrometry (ICP-MS/ICP-OES) and high-resolution gamma spectrometry range from ~0.3 to 0.5 mGya−1 , and OSL ages for features so far investigated range from 13 to 34 years to several 100 years. Sampled sands are rich in quartz and yields of 212–250 µm or 250–310 µm grains indicate high-resolution sampling at 1–2 cm intervals is possible. Despite the use of medium-sized aliquots to ensure the recovery of very dim natural OSL signals, these results demonstrate the potential of OSL for studying very young active fluvial processes in these settings
Characterization, performance, and prediction of a lead-acid battery under simulated electric vehicle driving requirements
A state-of-the-art 6-V battery module in current use by the electric vehicle industry was tested at the NASA Lewis Research Center to determine its performance characteristics under the SAE J227a driving schedules B, C, and D. The primary objective of the tests was to determine the effects of periods of recuperation and long and short periods of electrical regeneration in improving the performance of the battery module and hence extendng the vehicle range. A secondary objective was to formulate a computer program that would predict the performance of this battery module for the above driving schedules. The results show excellent correlation between the laboratory tests and predicted results. The predicted performance compared with laboratory tests was within +2.4 to -3.7 percent for the D schedule, +0.5 to -7.1 percent for the C schedule, and better than -11.4 percent for the B schedule
Apocalypse and recuperation: Blake and the maw of commerce
The paper is a "materialist" reading of Blake's illuminated works. It examines the copperplate method itself as the main theme of Blake's work, and also as a potentially practical means of conveying Blake's art to its intended audience. The question of audience must be at the center of any avowedly prophetic project. Did Blakean production actually facilitate reception? Are we the audience it sought? What forms of supplementary reproduction are necessary for modern discourse on Blake, and what are the effects of such mediation? To what extent does reproduction undermine. sublate, cancel or recuperate Blakean priorities even as it seeks to represent them? What do we actually read when we read a reproduction? The paper also thinks through the Blakean problem to a broader consideration of artistic projects operating marginally to the predominant cultural economy. and of their relation to criticism
Human Capital and Fertility in Germany after 1990: Evidence from a Multi-Spell Model
We analyze the timing of birth of the first three children based on German panel data (GSOEP) within a hazard rate framework. A random effects estimator is used to accommodate correlation across spells. We consider the role of human capital – approximated by a Mincer-type regression – and its gender-specific effects on postponement of parenthood and possible recuperation at higherorder births. An advantage of the use of panel data in this context consists in its prospective nature, so that determinants of fertility can be measured when at risk rather than ex-post, thus helping to reduce the risk of reverse causality. The analysis finds evidence for strong recuperation effects, i.e., women with greater human capital endowments follow, on average, a different birth history trajectory, but with negligible curtailment of completed fertility.fertility, human capital, event history analysis
Thermal coal drying with the high volatile matter output
Наведено аналіз сучасних технологій сушіння вугілля з високим вмістом летких. Промислове застосування набули парові сушарки з киплячим шаром продуктивністю 55 т/год, в яких теплоносієм є інертний азот, а необхідне тепло отримують за рахунок відхідних газів газифікатора, при цьому теплопередача здійснюється за допомогою гарячої води.Приведен анализ современных технологий сушки углей с высоким содержанием летучих. Промышленное применение получили паровые сушилки с кипящим слоем производительностью 55 т/ч, в которых теплоносителем служит инертный азот, а необходимое тепло получают за счет отходящих газов газификатора, при этом теплопередача осуществляется посредством горячей воды.An analysis of modern technologies of drying of coals with high content of volatile. Industrial applications received steam dryer with a fluidized bed with capacity of 55 tons/h, in which the coolant is inert nitrogen, and the necessary heat is generated by waste gases of the gasifier, the heat transfer is carried out by means of hot water
Design of an Elastic Actuation System for a Gait-Assistive Active Orthosis for Incomplete Spinal Cord Injured Subjects
A spinal cord injury severely reduces the quality of life of affected people. Following the injury,
limitations of the ability to move may occur due to the disruption of the motor and sensory functions
of the nervous system depending on the severity of the lesion. An active stance-control
knee-ankle-foot orthosis was developed and tested in earlier works to aid incomplete SCI subjects
by increasing their mobility and independence. This thesis aims at the incorporation of
elastic actuation into the active orthosis to utilise advantages of the compliant system regarding
efficiency and human-robot interaction as well as the reproduction of the phyisological compliance
of the human joints. Therefore, a model-based procedure is adapted to the design of
an elastic actuation system for a gait-assisitve active orthosis. A determination of the optimal
structure and parameters is undertaken via optimisation of models representing compliant actuators
with increasing level of detail. The minimisation of the energy calculated from the positive
amount of power or from the absolute power of the actuator generating one human-like gait cycle
yields an optimal series stiffness, which is similar to the physiological stiffness of the human
knee during the stance phase. Including efficiency factors for components, especially the consideration
of the electric model of an electric motor yields additional information. A human-like
gait cycle contains high torque and low velocities in the stance phase and lower torque combined
with high velocities during the swing. Hence, the efficiency of an electric motor with a gear unit
is only high in one of the phases. This yields a conceptual design of a series elastic actuator with
locking of the actuator position during the stance phase. The locked position combined with the
series compliance allows a reproduction of the characteristics of the human gait cycle during
the stance phase. Unlocking the actuator position for the swing phase enables the selection of
an optimal gear ratio to maximise the recuperable energy. To evaluate the developed concept,
a laboratory specimen based on an electric motor, a harmonic drive gearbox, a torsional series
spring and an electromagnetic brake is designed and appropriate components are selected. A
control strategy, based on impedance control, is investigated and extended with a finite state
machine to activate the locking mechanism. The control scheme and the laboratory specimen
are implemented at a test bench, modelling the foot and shank as a pendulum articulated at the
knee. An identification of parameters yields high and nonlinear friction as a problem of the system,
which reduces the energy efficiency of the system and requires appropriate compensation.
A comparison between direct and elastic actuation shows similar results for both systems at the
test bench, showing that the increased complexity due to the second degree of freedom and
the elastic behaviour of the actuator is treated properly. The final proof of concept requires the
implementation at the active orthosis to emulate uncertainties and variations occurring during
the human gait
Single-grain dose-distribution measurements by optically stimulated luminescence using an integrated EMCCD-based system
We report on the feasibility of assessing single-grain dose-distributions by
using an EMCCD-based imaging system with complementary analysis software.
Automated image-processing was successfully applied to compensate sample motion
and for automated grain identification. Following a dose recovery test, 74 % of
the grains were recognized successfully, and 44 % exhibited a suitable OSL dose
response behavior to interpolate an equivalent dose value and a central dose
recovery ratio of 1.038 was obtained.Comment: 30 pages, 6 figures, 2 table
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