The role of damping in the spin Seebeck effect (SSE) was studied experimentally for the first time. The experiments used Y
Fe
O
(YIG)/Pt bilayered structures where the YIG films exhibit very similar ...structural and static magnetic properties but very different damping. The data show that a decrease in the damping gives rise to an increase in the SSE coefficient, which is qualitatively consistent with some of the theoretical models. This response also shows quasi-linear behavior, which was not predicted explicitly by previous studies. The data also indicate that the SSE coefficient shows no notable correlations with the enhanced damping due to spin pumping, which can be understood in the frame of two existing models.
Metering for Exposure Stacks Gallo, O.; Tico, M.; Manduchi, R. ...
Computer graphics forum,
05/2012, Letnik:
31, Številka:
2pt2
Journal Article
Recenzirano
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When creating a High‐Dynamic‐Range (HDR) image from a sequence of differently exposed Low‐Dynamic‐Range (LDR) images, the set of LDR images is usually generated by sampling the space of exposure ...times with a geometric progression and without explicitly accounting for the distribution of irradiance values of the scene. We argue that this choice can produce sub‐optimal results both in terms of the number of acquired pictures and the quality of the resulting HDR image.
This paper presents a method to estimate the full irradiance histogram of a scene, and a strategy to select the set of exposures that need to be acquired. Our selection usually requires a smaller or equal set of LDRs, yet produces higher quality HDR images.
We compared 71 patients with irritable bowel syndrome (IBS) and 40 patients with inflammatory bowel disease (IBD) using structured interviews for psychiatric, gastrointestinal and sexual/physical ...victimization histories, as well as self-reported measures of personality, functional disability and dissociation. IBS patients had significantly higher lifetime prevalence rates of major depression, current panic disorder, and childhood sexual abuse. Despite the absence of organic pathology, IBS patients had significantly higher numbers of medically unexplained physical symptoms and disability ratings equal to, or greater than, those of patients with severe organic gastrointestinal disease.
Geometrically stable sampling for the ICP algorithm Gelfand, N.; Ikemoto, L.; Rusinkiewicz, S. ...
Fourth International Conference on 3-D Digital Imaging and Modeling, 2003. 3DIM 2003. Proceedings,
2003
Conference Proceeding
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The iterative closest point (ICP) algorithm is a widely used method for aligning three-dimensional point sets. The quality of alignment obtained by this algorithm depends heavily on choosing good ...pairs of corresponding points in the two datasets. If too many points are chosen from featureless regions of the data, the algorithm converges slowly, finds the wrong pose, or even diverges, especially in the presence of noise or miscalibration in the input data. We describe a method for detecting uncertainty in pose, and we propose a point selection strategy for ICP that minimizes this uncertainty by choosing samples that constrain potentially unstable transformations.
Although prior theories about psychiatric disorders causing inflammatory bowel disease (IBD) have largely been discredited, these same disorders have at times been associated with functional ...gastrointestinal symptoms such as those found in irritable bowel syndrome. Since functional gastrointestinal symptoms can also occur in patients with organic pathology, we hypothesized that a current psychiatric disorder might amplify or produce additional gastrointestinal symptoms in patients with organic gastrointestinal diseases such as IBD, leading to additive functional disability and decreased quality of life. This pilot study evaluated a sequential sample of 40 IBD patients using the NIMH Diagnostic Interview Schedule, structured interviews for functional gastrointestinal symptoms, and prior episodes of emotional, physical, and sexual abuse as well as self-report measures of personality and disability. We compared IBD patients with and without a current psychiatric disorder while controlling for disease severity. Eight patients with major depression were treated with antidepressants. Patients with a current psychiatric disorder had significantly higher 1) mean number of lifetime psychiatric diagnoses, 2) prevalence rates of prior sexual and physical victimization, and, 3) mean numbers of both gastrointestinal and other medically unexplained symptoms despite no differences in severity of IBD. Significant and trend level differences were apparent on several measures of functional disability. A regression analysis showed that number of psychiatric diagnoses, number of functional gastrointestinal symptoms, and dissociation scale scores significantly discriminated the groups. Treatment of current major depression decreased functional disability despite no objective changes in gastrointestinal disease severity. It was concluded that the presence of a current psychiatric disorder appears to alter the perception of disease severity in patients with IBD. Nonrecognition of the psychiatric disorder may lead to unnecessary and aggressive interventions for IBD patients such as medication changes, invasive testing, or surgery. The presence of a current psychiatric illness also appears to be associated with increased functional disability. Psychiatric evaluation and treatment, therefore, have an important role in the ongoing management of IBD patients with distressing gastrointestinal symptoms not directly attributable to their IBD.
Several recent retrospective reports have associated prior sexual victimization and long-term medical sequelae such as increased medical clinic utilization and reports of physical symptoms. However, ...methodological constraints have limited the generalizability of these findings. Our study was designed using structured interviews with a sequential sample of 89 female gastroenterology clinic patients, who were classified by severity of sexual trauma and studied for differences in lifetime psychiatric diagnoses, physical abuse, and medically unexplained symptom patterns. Compared with the 46 women who had experienced less severe or no prior sexual trauma, the 43 patients with severe victimization had significantly higher lifetime and current rates of several selected psychiatric disorders as well as significantly higher mean numbers of lifetime psychiatric disorders, medically unexplained physical and anxiety symptoms, greater harm avoidance and dissociation scores, and increased functional disability. A logistic regression showed that the main predictors of a history of severe sexual abuse were the number of medically unexplained symptoms, adult physical abuse, and lifetime dysthymic disorder. We concluded that women with prior severe sexual trauma episodes may express medically unexplained physical symptoms as part of the long-term adaptation to their victimization.
Chronic pelvic pain and irritable bowel syndrome are common disorders, yet very little is known about their comorbidity. As part of an epidemiological study of patients with irritable bowel syndrome ...or irritable bowel disease we inquired about a history of chronic pelvic pain and related gynecological problems, and hypothesized that distress associated with either of these conditions was additive in women with both syndromes. A medically trained interviewer evaluated a sequential sample of 60 women with irritable bowel syndrome and 26 women with inflammatory bowel disease in an urban gastroenterology clinic using the National Institute of Mental Health Diagnostic Interview Schedule, the Briere Child Maltreatment Interview (emotional, physical and sexual abuse), and a structured interview to elicit a lifetime history of chronic pelvic pain that was distinct from the history of bowel distress. Chronic pelvic pain was reported in 21 (35.0%) of the irritable bowel syndrome patients vs. 4 (13.8%) of the inflammatory bowel disease group (p < 0.05). Compared to women with irritable bowel syndrome alone, those with both irritable bowel syndrome and chronic pelvic pain were significantly more likely to have a lifetime history of dysthymic disorder, current and lifetime panic disorder, somatization disorder, childhood sexual abuse and hysterectomy. Logistic regression showed that mean number of somatization symptoms was the best predictor of a history of both irritable bowel syndrome and chronic pelvic pain compared either to inflammatory bowel disease or irritable bowel syndrome alone. Many women with irritable bowel syndrome may have a history of chronic pelvic pain as well. The high rates of psychopathology associated with irritable bowel syndrome and chronic pelvic pain independently are even higher in women with both syndromes, and women who present with either irritable bowel syndrome or chronic pelvic pain should probably be evaluated for both disorders.
A hierarchical method for aligning warped meshes Ikemoto, L.; Gelfand, N.; Levoy, M.
Fourth International Conference on 3-D Digital Imaging and Modeling, 2003. 3DIM 2003. Proceedings,
2003
Conference Proceeding
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Current alignment algorithms for registering range data captured from a 3D scanner assume that the range data depicts identical geometry taken from different views. However, in the presence of ...scanner calibration errors, the data will be slightly warped. These warps often cause current alignment algorithms to converge slowly, find the wrong alignment, or even diverge. We present a method for aligning warped range data represented by polygon meshes. Our strategy can be characterized as a coarse-to-fine hierarchical approach, where we assume that since the warp is global, we can compensate for it by treating each mesh as a collection of smaller piecewise rigid sections, which can translate and rotate with respect to each other. We split the meshes subject to several constraints, in order to ensure that the resulting sections converge reliably.
The molecular and crystal structure of binuclear boron difluoride acetylacetonate, in which two boron chelate moieties are linked by a disulfide group, is determined. It is found that in the ...crystalline state, the chelate moieties are non-equivalent. The differences identified stem from the fact that molecules crystallize in pairs: two chelate ring (one from each molecule of the pair) are linked with each other by the stacking interaction. The other chelate rings of the pair do not participate in intermolecular interactions.
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