Secrecy and absence in the residue of post-9/11 covert counter-terrorism

This thesis examines how secrecy and absence shape the representation of covert counter-terrorism in the public sphere. Contemporary covert practices, from missile strikes by unmanned aerial vehicles to special forces 'kill/capture' operations, have come to exemplify U.S. counter-terrorism in public debate. This is significant because these practices shift the ethical stakes of witnessing state warfare. Previous scholarship on war and news media has argued that public glimpses of state violence, alongside official declarations, can demonise or dehumanise the targets of such violence, and thus prompt witnesses to accept the state's rationalisation of these actions and the use of secrecy. News coverage of contemporary covert action, however, offers no such glimpses. Instead, coverage draws primarily upon residue: the rumours and debris left behind. By applying this concept of residue to drone strikes, the special forces raid that killed Osama bin Laden, and kidnap rescue efforts in the Sahara-Sahel, the thesis argues that it is all this speculation, rubble, and empty space, rather than the state itself, which signifies to newsreaders the possibility of state secrecy. That suspicion of secrecy then frames the absences in this residue, the conspicuous lack of certain bodies and objects. Secrecy makes those absences appear suggestive, in that the latter cannot publicly corroborate different aspects of these unseen events. This allows residue to intimate – to hint at unverifiable ideas about that which is absent, in a way which can undermine more explicit claims and justifications of what has taken place. To examine how this dynamic reframes the ethics of witnessing, the thesis develops an historical affiliation, a method of linking disparate practices of violence based on similar representational qualities, in order to examine whether witnessing is being shaped by these qualities in obscured or unspoken ways. This affiliation is made between representations of covert counter-terrorism and those of lynching in the United States in the late nineteenth and early twentieth centuries. Despite their differences, in both cases unseen violence and absent bodies are represented as significant in their being disconnected from wider society and difficult to comprehend, to understand how and why the violence takes place. This occurs in today's counter-terrorism through hints and allusions from absence, which represent these covert events as physically intangible. As with lynching, violence and its casualties are implicitly represented in their absence as reflecting the public's intellectual and moral distance from the practice. This takes covert counter-terrorism beyond a binary of fostering assent or dissent towards the state. Instead of prompting newsreaders' complicity with state narratives for its actions, residue intimates doubts and unspoken possibilities about these events that curtail their rationalisation. Insodoing, however, these representations marginalise the violence inflicted upon casualties from ethical consideration. They do so while obscuring how that marginalisation occurs, as newsreaders are prompted to see themselves as distanced from these events and to focus upon that distance, rather than on how absences are being given significance in the public sphere. Using the historical affiliation with lynching, the thesis concludes that an ethical witnessing of covert counter-terrorism through its residue cannot be based on an attempt to recognise and 'recover' lived experiences of suffering from rumours and debris. Rather, ethical witnessing would involve an awareness of how distance is constructed through that residue, and how this gives unspoken meaning to absence

Quantification of Olivine Using Fe Lα in Electron Probe Microanalysis (EPMA)

AbstractQuantification of first series transition metal Lα X-rays is hampered by absorption and in some cases transition probabilities (fluorescence yields) varying with chemical bonding. Compound mass absorption coefficients for Fe Lα were measured in the olivine solid solution series [Forsterite (Mg2SiO4) to Fayalite (Fe2SiO4)] and the mass absorption coefficients for Fe Lα absorbed by Fe were calculated. The mass absorption coefficients vary systematically between Fo83 and Fo0. Using the measured mass absorption coefficients for both standard and unknown and by correcting for a systematic discrepancy, consistent with varying partial fluorescence yields, a good agreement between calculated k-ratios and measured k-ratios is achieved. The systematic variations allow quantification of unknown k-ratios. The described method of quantification requires modification of matrix correction routines to allow standards and unknowns to have different mass absorption coefficients, and to incorporate solid solution mass absorption coefficients and partial fluorescence yield corrections derived from regression of experimental data.</jats:p

Cost-effectiveness of screening for ovarian cancer amongst postmenopausal women: a model-based economic evaluation

Background The United Kingdom Collaborative Trial of Ovarian Cancer Screening (UKCTOCS) was the biggest ovarian cancer screening trial to date. A non-significant effect of screening on ovarian cancer was reported, but the authors noted a potential delayed effect of screening, and suggested the need for four years further follow-up. There are no UK-based cost-effectiveness analyses of ovarian cancer screening. Hence we assessed the lifetime outcomes associated with, and the cost-effectiveness of, screening for ovarian cancer in the UK, along with the value of further research. Methods We performed a model-based economic evaluation. Effectiveness data were taken from UKCTOCS, which considered strategies of multimodal screening (MMS), ultrasound screening (USS) and no screening. We conducted systematic reviews to identify the remaining model inputs, and performed a rigorous and transparent prospective evaluation of different methods for extrapolating the effect of screening on ovarian cancer mortality. We considered costs to the UK healthcare system and measured effectiveness using quality-adjusted life years (QALYs). We used value of information methods to estimate the value of further research. Results Over a lifetime, MMS and USS were estimated to be both more expensive and more effective than no screening. USS was dominated by MMS, being both more expensive and less effective. Compared with no screening, MMS cost on average £419 more (95% confidence interval £255 to £578), and generated 0.047 more QALYs (0.002 to 0.088). The incremental cost-effectiveness ratio (ICER) comparing MMS with no screening was £8864 per QALY (£2600 to £51,576). Alternative extrapolation methods increased the ICER, with the highest value being £36,769 (£13,888 to dominated by no screening). Using the UKCTOCS trial horizon, both MMS and USS were dominated by no screening, as they produced fewer QALYs at a greater cost. The value of research into eliminating all uncertainty in long-term effectiveness was estimated to be worth up to £20 million, or approximately £5 million for four years follow-up. Conclusions Screening for ovarian cancer with MMS is both more effective and more expensive than not screening. Compared to national willingness to pay thresholds, lifetime cost-effectiveness is promising, but there remains considerable uncertainty regarding extrapolated long-term effectiveness

The Accuracy of Al and Cu Film Thickness Determinations and the Implications for Electron Probe Microanalysis

AbstractThe accuracy to which Cu and Al coatings can be determined, and the effect this has on the quantification of the substrate, is investigated. Cu and Al coatings of nominally 5, 10, 15, and 20 nm were sputter coated onto polished Bi using two configurations of coater: One with the film thickness monitor (FTM) sensor colocated with the samples, and one where the sensor is located to one side. The FTM thicknesses are compared against those calculated from measured Cu Lαand Al Kα k-ratios using PENEPMA, GMRFilm, and DTSA-II. Selected samples were also cross-sectioned using focused ion beam. Both systems produced repeatable coatings, the thickest coating being approximately four times the thinnest coating. The side-located FTM sensor indicated thicknesses less than half those of the software modeled results, propagating on to 70% errors in substrate quantification at 5 kV. The colocated FTM sensor produced errors in film thickness and substrate quantification of 10–20%. Over the range of film thicknesses and accelerating voltages modeled both the substrate and coatingk-ratios can be approximated by linear trends as functions of film thickness. The Al films were found to have a reduced density of ~2 g/cm2.</jats:p

What constitutes brilliant aged care? : a qualitative study of practices that exceed expectation

Aim: This study aimed to explore what constitutes brilliant aged care. Background: Although many aged care services do not offer the care that older people and carers need and want, some perform better. Rather than focus on problems with aged care, this study examined brilliant aged care—practices that exceeded expectation. Design: The methodology for this study was informed by grounded theory, under-pinned by constructionism to socially construct meaning. Methods: This study invited nominations for a Brilliant Award via a survey, and inter-views with the nominees via web conference. After receiving survey responses from 10 nominators, interviews were conducted with 12 nominees. Data were analysed using reflexive thematic analysis and documented according to COREQ guidelines to optimise rigour and transparency. Results: According to participants, brilliant aged care involved being relationally at-tuned to older people, a deep understanding of the older person, recognition of aged care as more than a job, innovative practices and permission to reprioritise. Conclusions: This study suggests that, in aged care, brilliance happens. It emphasises the importance of meaningful connections and relationships in aged care, where thoughtful acts acknowledge an older person's value and humanity as well as creativity and innovation. Relevance to Clinical Practice: For those who manage and deliver aged care, the findings suggest that small practice changes can make a positive difference to older people. Brilliant aged care can involve acts of empathy; enthusiasm for aged care; innovative practices, even those that are small scale; and reprioritising workplace tasks to spend time with older people. For policymakers, this study highlights the need to recognise and raise the profile of the pockets of brilliance within the aged care sector. This might be achieved via awards and other initiatives that serve to celebrate and learn from brilliance in its myriad forms. Patient or Public Contribution: The nominees, who included carers, were invited to participate in workshops with other carers and older people to co-design a model of brilliant aged care, during which workshop participants discussed and critiqued the findings constructed from the data

Cellular Architecture Mediates DivIVA Ultrastructure and Regulates Min Activity in Bacillus subtilis

The assembly of the cell division machinery at midcell is a critical step of cytokinesis. Many rod-shaped bacteria position septa using nucleoid occlusion, which prevents division over the chromosome, and the Min system, which prevents division near the poles. Here we examined the in vivo assembly of the Bacillus subtilis MinCD targeting proteins DivIVA, a peripheral membrane protein that preferentially localizes to negatively curved membranes and resembles eukaryotic tropomyosins, and MinJ, which recruits MinCD to DivIVA. We used structured illumination microscopy to demonstrate that both DivIVA and MinJ localize as double rings that flank the septum and first appear early in septal biosynthesis. The subsequent recruitment of MinCD to these double rings would separate the Min proteins from their target, FtsZ, spatially regulating Min activity and allowing continued cell division. Curvature-based localization would also provide temporal regulation, since DivIVA and the Min proteins would localize to midcell after the onset of division. We use time-lapse microscopy and fluorescence recovery after photobleaching to demonstrate that DivIVA rings are highly stable and are constructed from newly synthesized DivIVA molecules. After cell division, DivIVA rings appear to collapse into patches at the rounded cell poles of separated cells, with little or no incorporation of newly synthesized subunits. Thus, changes in cell architecture mediate both the initial recruitment of DivIVA to sites of cell division and the subsequent collapse of these rings into patches (or rings of smaller diameter), while curvature-based localization of DivIVA spatially and temporally regulates Min activity

Robustness and Generalization

We derive generalization bounds for learning algorithms based on their robustness: the property that if a testing sample is "similar" to a training sample, then the testing error is close to the training error. This provides a novel approach, different from the complexity or stability arguments, to study generalization of learning algorithms. We further show that a weak notion of robustness is both sufficient and necessary for generalizability, which implies that robustness is a fundamental property for learning algorithms to work

Lipid phosphate phosphatase 3 participates in transport carrier formation and protein trafficking in the early secretory pathway

The inhibition of phosphatidic acid phosphatase (PAP) activity by propanolol indicates that diacylglycerol (DAG) is required for the formation of transport carriers at the Golgi and for retrograde trafficking to the ER. Here we report that the PAP2 family member lipid phosphate phosphatase 3 (LPP3, also known as PAP2b) localizes in compartments of the secretory pathway from ER export sites to the Golgi complex. The depletion of human LPP3: (i) reduces the number of tubules generated from the ER-Golgi intermediate compartment and the Golgi, with those formed from the Golgi being longer in LPP3-silenced cells than in control cells; (ii) impairs the Rab6-dependent retrograde transport of Shiga toxin subunit B from the Golgi to the ER, but not the anterograde transport of VSV-G or ssDsRed; and (iii) induces a high accumulation of Golgi-associated membrane buds. LPP3 depletion also reduces levels of de novo synthesized DAG and the Golgi-associated DAG contents. Remarkably, overexpression of a catalytically inactive form of LPP3 mimics the effects of LPP3 knockdown on Rab6-dependent retrograde transport. We conclude that LPP3 participates in the formation of retrograde transport carriers at the ER-Golgi interface, where it transitorily cycles, and during its route to the plasma membrane