226 research outputs found
Simplified solutions of the Cox-Thompson inverse scattering method at fixed energy
Simplified solutions of the Cox-Thompson inverse quantum scattering method at
fixed energy are derived if a finite number of partial waves with only even or
odd angular momenta contribute to the scattering process. Based on new formulae
various approximate methods are introduced which also prove applicable to the
generic scattering events.Comment: 9 pages, 3 figure
The Dialectal Position of Anatolian within Indo-European
Proceedings of the Twenty-Fourth Annual Meeting of the Berkeley
Linguistics Society: Special Session on Indo-European Subgrouping and
Internal Relations (1998
Phase transitions in diluted negative-weight percolation models
We investigate the geometric properties of loops on two-dimensional lattice
graphs, where edge weights are drawn from a distribution that allows for
positive and negative weights. We are interested in the appearance of spanning
loops of total negative weight. The resulting percolation problem is
fundamentally different from conventional percolation, as we have seen in a
previous study of this model for the undiluted case.
Here, we investigate how the percolation transition is affected by additional
dilution. We consider two types of dilution: either a certain fraction of edges
exhibit zero weight, or a fraction of edges is even absent. We study these
systems numerically using exact combinatorial optimization techniques based on
suitable transformations of the graphs and applying matching algorithms. We
perform a finite-size scaling analysis to obtain the phase diagram and
determine the critical properties of the phase boundary.
We find that the first type of dilution does not change the universality
class compared to the undiluted case whereas the second type of dilution leads
to a change of the universality class.Comment: 8 pages, 7 figure
Gemcitabine and carboplatin in intensively pretreated patients with metastatic breast cancer
Background: Patients with metastatic breast cancer (MBC) are increasingly exposed to anthracyclines and taxanes either during treatment of primary breast cancer or during initial therapy of metastatic disease. The combination of gemcitabine and carboplatin was therefore investigated as an anthracycline- and taxane-free treatment option. Patients and Methods: MBC patients previously treated with chemotherapy were enrolled in a multicenter phase II study. Treatment consisted of gemcitabine (1,000 mg/m(2) i.v. on days 1 and 8) and carboplatin (AUC 4 i.v. on day 1) applied every 3 weeks. Results: Thirty-nine patients were recruited, and a total of 207 treatment cycles were applied with a median of 5 cycles per patient. One complete response and 11 partial responses were observed for an overall response rate of 31% (95% CI: 17-48%). Twelve patients (31%) had stable disease. Median time to progression was 5.3 months (95% CI: 2.6-6.7 months) and median overall survival from start of treatment was 13.2 months (95% CI: 8.7-16.7 months). Grade 3/4 hematological toxicity included leukopenia (59%/5%), thrombo-cytopenia (26%/23%) and anemia (10%/0%). Nonhematological toxicity was rarely severe. Conclusion: Combination chemotherapy with gemcitabine and carboplatin is an effective and generally well-tolerated treatment option for intensively pretreated patients with MBC. Due to a considerable incidence of severe thrombocytopenia it would be reasonable to consider starting gemcitabine at the lower dose level of 800 mg/m(2). Copyright (c) 2008 S. Karger AG, Basel
Applying Task Force Recommendations on Integrating Science and Practice in Health Service Psychology Education
The proper role of research skills and training to conduct research in professional psychology education has been controversial throughout the history of the field. An extensive effort was undertaken recently to address that issue and identify ways the field might move forward in a more unified manner. In 2015, the American Psychological Association (APA) Board of Educational Affairs convened a task force to address one of the recommendations made by the Health Service Psychology Education Collaborative in 2013. That recommendation stated that the education and training of health service psychologists (HSPs) include an integrative approach to science and practice that incorporates scientific-mindedness, training in research skills, and goes well beyond merely âconsumingâ research findings. The task force subsequently developed recommendations related to the centrality of science competencies for HSPs and how these competencies extend beyond training in evidence-based practice. This article discusses the findings of the task force and the implications of its recommendations for education and training in HSP. The challenges and opportunities associated with implementing these recommendations in HSP graduate programs are examined
Fractal dimension of domain walls in two-dimensional Ising spin glasses
We study domain walls in 2d Ising spin glasses in terms of a minimum-weight
path problem. Using this approach, large systems can be treated exactly. Our
focus is on the fractal dimension of domain walls, which describes via
\simL^{d_f} the growth of the average domain-wall length with %%
systems size . %% 20.07.07 OM %% Exploring systems up to L=320 we
yield for the case of Gaussian disorder, i.e. a much higher
accuracy compared to previous studies. For the case of bimodal disorder, where
many equivalent domain walls exist due to the degeneracy of this model, we
obtain a true lower bound and a (lower) estimate
as upper bound. Furthermore, we study the distributions of the domain-wall
lengths. Their scaling with system size can be described also only by the
exponent , i.e. the distributions are monofractal. Finally, we investigate
the growth of the domain-wall width with system size (``roughness'') and find a
linear behavior.Comment: 8 pages, 8 figures, submitted to Phys. Rev. B; v2: shortened versio
Syntax of the Hittite âSupineâ Construction
As is well-known, the Hittite verbal form ending in -(u)wan, labeled now for more than half a century the âsupineâ, occurs only in a construction with either dai- âto putâ or tiya- âto stepâ that expresses the notion âbegin/undertake to do Xâ: (1) KBo 5.8 iii 3-5 (CTH 61, Annals of MurĆĄili; NH)namma=ĆĄmaĆĄ=kan ĂRIN.MEĆ iĆĄáž«iáž«áž«un nu=mu ĂRIN.MEĆ piĆĄkewan dÄir n=at=mu laáž«áž«i kattan paiĆĄgauwan tiyÄr âThen I imposed (a commitment for) troops on them, and they began to give me troops and began to go o..
Reply to Witthöft et al. Comment on âWardzinski et al. Mobile Phone Radiation Deflects Brain Energy Homeostasis and Prompts Human Food Ingestion. Nutrients 2022, 14, 339â
We are somewhat surprised about the extent of the feedback that we received upon
our publication [1], in terms of the not entirely new connection between mobile phone
radiation, brain activity, and food intake, being previously explored by EEG, association
studies, and animal experiments (as outlined in the introduction of our paper). Ten years
ago, scientists found âalarmingâ evidence of a long-term association between mobile phone
radiation and obesity in humans [2]. Specifically, we are perplexed by the partly emotional
character of the discussion among our readers. However, back to the facts:
We thank our scientific colleagues for their detailed analyses and considerations [3]
regarding our study and are pleased to explain the open points for more clarity
Diking, young volcanism and diffuse hydrothermal activity on the southern Mid-Atlantic Ridge: The Lilliput field at 9°33'S
Detailed exploration with remotely operated and autonomous deep submergence vehicles has revealed, at 9 degrees 33'S, the presence of the southernmost active hydrothermal field known so far on the Mid-Atlantic Ridge. The size of the hydrothermal field, which we have named "Lilliput", is about 1000 m x 250 m. It lies in a water depth of 1500 m on a ridge segment (Segment A3) with considerably thickened crust of 11 km. Four relatively small diffuse vent sites occur on a large young (estimated <100 years old) lava flow, partly covering the flow with hydrothermal Fe-oxide/hydroxide sediments. Based on homogeneous major element compositions of ca. 25 lava samples, this flow covers an area of at least 5 km x 0.6 km. The lava flow erupted from a series of parallel fissures at the western edge of the flow and a volcanic ridge consisting of up to 30 m high pillow mounds. The volcanic ridge probably represents the surface expression of an underlying dike which fed the flow. Several drained lava pond structures were observed within the flow but only one shows hydrothermal activity. The hydrothermal venting and precipitation of abundant Fe-oxyhydroxides appear to be related to the young diking and eruption event and the four different hydrothermally active sites of the Lilliput field lie along and almost equidistant from the eastern flank of the supposed dike. Although a hydrothermal plume some 500 m above the seafloor was found in two consecutive years (2005 and 2006), no high-temperature venting associated with Lilliput has been found. in agreement with findings at other ridges with thick crust such as Reykjanes. High magma supply rate and frequent diking and eruption events may lead to hot hydrothermal vents being rare in slow-spreading segments with thick crust whereas diffuse venting is abundant. Interestingly, the fauna at the Lilliput vents largely consists of small and apparently juvenile mussels (Bathymodiolus sp.) and did not show any signs of growth during the four years of continuing observations possibly reflecting pulsing hydrothermal activity
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