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Deutschsein auf Probe

Claudia Diehl, Patrick Fick
2012 Soziale Welt  
/Patrick Fick  ...  Optionszwang, möglicherweise ist dies ein Hinweis darauf, dass das Festhalten am Prinzip der Vermeidung von Mehrstaatigkeit besonders für gut integrierte Personen ein Einbürgerungshemmnis darstellt. 342 Claudia Diehl  ...  Fick / Diehl 2013) .  ... 
doi:10.5771/0038-6073-2012-4-339 fatcat:ycbtcj3uafe5zfhjr5p6bbty5a

Peridynamics for Quasistatic Fracture Modeling [article]

Debdeep Bhattacharya and Patrick Diehl and Robert P. Lipton
2021 arXiv   pre-print
Fracture involves interaction across large and small length scales. With the application of enough stress or strain to a brittle material, atomistic scale bonds will break, leading to fracture of the macroscopic specimen. From the perspective of mechanics fracture should appear as an emergent phenomena generated by a continuum field theory eliminating the need for a supplemental kinetic relation describing crack growth. We develop a new fast method for modeling quasi-static fracture using
more » ... namics. We apply fixed point theory and model stable crack evolution for hard and soft loading. For soft loading we recover unstable fracture. For hard loading we recover stable crack growth. We show existence of quasistatic fracture solutions in the neighborhood of stable critical points for appropriately defined energies. The numerical method uses an analytic stiffness matrix for fast numerical implementation. A rigorous mathematical analysis shows that the method converges for load paths associated with soft and hard loading. For soft loading the crack becomes unstable shortly after the stress at the tip of the pre-crack reaches the material strength.
arXiv:2107.14665v1 fatcat:wd2z4y4ev5eejhagddochwczde

Ethnische Diskriminierung im deutschen Bildungssystem [chapter]

Claudia Diehl, Patrick Fick
2015 Ethnische Ungleichheiten im Bildungsverlauf  
Gerade' Türkischstämmige' fühlen'sich'auch'subjektiv'recht'stark'benachteiligt' (Hans'2010) ,'dies'gilt'auch'für'Schülerinnen' und'Schüler' (Diehl/Fick'2011 ),'und'tatsächlich'sind'die'sozialen'Distanzen'der'MehrheitsangeK  ... 
doi:10.1007/978-3-658-04322-3_6 fatcat:4ji4onsi7bdari43nf4c2noesu

On the treatment of boundary conditions for bond-based peridynamic models [article]

Serge Prudhomme, Patrick Diehl
2020 arXiv   pre-print
In this paper, we propose two approaches to apply boundary conditions for bond-based peridynamic models. There has been in recent years a renewed interest in the class of so-called non-local models, which include peridynamic models, for the simulation of structural mechanics problems as an alternative approach to classical local continuum models. However, a major issue, which is often disregarded when dealing with this class of models, is concerned with the manner by which boundary conditions
more » ... ould be prescribed. Our point of view here is that classical boundary conditions, since applied on surfaces of solid bodies, are naturally associated with local models. The paper describes two methods to incorporate classical Dirichlet and Neumann boundary conditions into bond-based peridynamics. The first method consists in artificially extending the domain with a thin boundary layer over which the displacement field is required to behave as an odd function with respect to the boundary points. The second method resorts to the idea that peridynamic models and local models should be compatible in the limit that the so-called horizon vanishes. The approach consists then in decreasing the horizon from a constant value in the interior of the domain to zero at the boundary so that one can directly apply the classical boundary conditions. We present the continuous and discrete formulations of the two methods and assess their performance on several numerical experiments dealing with the simulation of a one-dimensional bar.
arXiv:2008.09725v1 fatcat:777vtv2mp5fq7c2z6hpagi33li

Coupling approaches for classical linear elasticity and bond-based peridynamic models [article]

Patrick Diehl, Serge Prudhomme
2022 arXiv   pre-print
Local-nonlocal coupling approaches provide a means to combine the computational efficiency of local models and the accuracy of nonlocal models. This paper studies the continuous and discrete formulations of three existing approaches for the coupling of classical linear elasticity and bond-based peridynamic models, namely 1) a method that enforces matching displacements in an overlap region, 2) a variant that enforces a constraint on the stresses instead, and 3) a method that considers a
more » ... horizon in the vicinity of the interfaces. The performance of the three coupling approaches is compared on a series of one-dimensional numerical examples that involve cubic and quartic manufactured solutions. Accuracy of the proposed methods is measured in terms of the difference between the solution to the coupling approach and the solution to the classical linear elasticity model, which can be viewed as a modeling error. The objective of the paper is to assess the quality and performance of the discrete formulation for this class of force-based coupling methods.
arXiv:2203.09934v1 fatcat:v5dhpfkv7feyhhwt4oc6c5tl3u

Representing vision and blindness

Patrick L. Ray, Alexander P. Cox, Mark Jensen, Travis Allen, William Duncan, Alexander D. Diehl
2016 Journal of Biomedical Semantics  
There have been relatively few attempts to represent vision or blindness ontologically. This is unsurprising as the related phenomena of sight and blindness are difficult to represent ontologically for a variety of reasons. Blindness has escaped ontological capture at least in part because: blindness or the employment of the term 'blindness' seems to vary from context to context, blindness can present in a myriad of types and degrees, and there is no precedent for representing complex phenomena
more » ... such as blindness. Methods: We explore current attempts to represent vision or blindness, and show how these attempts fail at representing subtypes of blindness (viz., color blindness, flash blindness, and inattentional blindness). We examine the results found through a review of current attempts and identify where they have failed. Results: By analyzing our test cases of different types of blindness along with the strengths and weaknesses of previous attempts, we have identified the general features of blindness and vision. We propose an ontological solution to represent vision and blindness, which capitalizes on resources afforded to one who utilizes the Basic Formal Ontology as an upper-level ontology. Conclusions: The solution we propose here involves specifying the trigger conditions of a disposition as well as the processes that realize that disposition. Once these are specified we can characterize vision as a function that is realized by certain (in this case) biological processes under a range of triggering conditions. When the range of conditions under which the processes can be realized are reduced beyond a certain threshold, we are able to say that blindness is present. We characterize vision as a function that is realized as a seeing process and blindness as a reduction in the conditions under which the sight function is realized. This solution is desirable because it leverages current features of a major upper-level ontology, accurately captures the phenomenon of blindness, and can be implemented in many domain-specific ontologies.
doi:10.1186/s13326-016-0058-0 pmid:27034769 pmcid:PMC4815270 fatcat:rfqii6m7krgcfo76liqeoe7ily

ML-based tactile sensor calibration: A universal approach [article]

Maximilian Karl, Artur Lohrer, Dhananjay Shah, Frederik Diehl, Max Fiedler, Saahil Ognawala, Justin Bayer, Patrick van der Smagt
2016 arXiv   pre-print
Patrick van der Smagt is also at fortiss, TUM Associate Institute. Justin Bayer is also affiliated with UG (haftungsbeschränkt), München, Germany.  ... 
arXiv:1606.06588v1 fatcat:jxn7ihxwivgizjxujc6lmatwhm

Closing the Performance Gap with Modern C++ [chapter]

Thomas Heller, Hartmut Kaiser, Patrick Diehl, Dietmar Fey, Marc Alexander Schweitzer
2016 Lecture Notes in Computer Science  
On the way to Exascale, programmers face the increasing challenge of having to support multiple hardware architectures from the same code base. At the same time, portability of code and performance are increasingly difficult to achieve as hardware architectures are becoming more and more diverse. Today's heterogeneous systems often include two or more completely distinct and incompatible hardware execution models, such as GPGPU's, SIMD vector units, and general purpose cores which
more » ... have to be programmed using separate tool chains representing non-overlapping programming models. The recent revival of interest in the industry and the wider community for the C++ language has spurred a remarkable amount of standardization proposals and technical specifications in the arena of concurrency and parallelism. This recently includes an increasing amount of discussion around the need for a uniform, higher-level abstraction and programming model for parallelism in the C++ standard targeting heterogeneous and distributed computing. Such an abstraction should perfectly blend with existing, already standardized language and library features, but should also be generic enough to support future hardware developments. In this paper, we present the results from developing such a higher-level programming abstraction for parallelism in C++ which aims at enabling code and performance portability over a wide range of architectures and for various types of parallelism. We present and compare performance data obtained from running the well-known STREAM benchmark ported to our higher level C++ abstraction with the corresponding results from running it natively. We show that our abstractions enable performance at least as good as the comparable base-line benchmarks while providing a uniform programming API on all compared target architectures.
doi:10.1007/978-3-319-46079-6_2 fatcat:qmzryv6j4fhlpmiqddjbxh776q

Rasmussen encephalitis: an older adult presentation?

Ricardo Pires Alvim, Patrick Aguiar, Daniel Kempel Amado, Maria Sheila Guimarães Rocha, Roberta Diehl Rodriguez, Sonia Maria Dozzi Brucki
2020 Dementia & Neuropsychologia  
ABSTRACT. Rasmussen encephalitis (RE) is a classic disorder in the child age group, and only 10% of cases are described in adults. We bring two proven cases of RE in older adults aged over 55 years. Objective: To describe the clinical characteristics, progression, diagnostic assessment, neuropathological findings, and treatment of RE in two clinical cases of patients over 55 years of age. Furthermore, we address progressive cognitive decline as an important feature of the RE presentation in
more » ... r adults in association with focal epilepsy. Methods: This is a case series from two tertiary hospitals from São Paulo – Brazil. Retrospective data were collected from one case. Results: Two male individuals aged >55 years with clinical presentation of focal epilepsy along with progressive cognitive deterioration. Conclusions: RE could be considered the cause of progressive cognitive decline in older adults, especially if focal epilepsy is described together with asymmetrical neuroimaging findings.
doi:10.1590/1980-57642020dn14-040016 pmid:33354299 pmcid:PMC7735055 fatcat:w42laxdmpzfsfeiwhf26crktoq

Overexpression of caspase-3 in hepatocellular carcinomas

Rajendra Persad, Chen Liu, Tsung-Teh Wu, Patrick S Houlihan, Stanley R Hamilton, Anna M Diehl, Asif Rashid
2004 Modern Pathology  
Caspase-3 is a downstream effector cysteine protease in the apoptotic pathway. It is ubiquitously expressed in normal human tissues including the liver. Overexpression and loss of expression of caspase-3 has been reported in diverse human malignancies. However, expression of caspase-3 in hepatocellular carcinoma (HCC) has not been studied. Therefore, we studied its expression in four hepatoma cell lines and 22 HCCs by Western blot, and correlated the findings with in vitro caspase-3 activity
more » ... apoptosis. In addition, 47 surgically resected HCCs and 29 metastatic colorectal carcinomas were evaluated for caspase-3 expression by immunohistochemistry on formalin-fixed, paraffin-embedded tissue sections, and the staining intensity was correlated with the clinicopathological features. Caspase-3 overexpression was present in all four hepatoma cell lines, and 68% (15/22) of HCCs in comparison to the non-neoplastic liver parenchyma by Western blot, and in 52% (36/69) of HCCs by immunohistochemistry. Caspase-3 overexpression in HCCs by Western blot correlated with caspase-3 overexpression by immunohistochemistry (P ¼ 0.002), and in vitro caspase-3 activity (P ¼ 0.01). Caspase-3 overexpression in HCCs by immunohistochemistry was associated with serum afetoprotein (AFP) levels (P ¼ 0.01). In conclusion, caspase-3 is frequently overexpressed in HCCs and is associated with high serum levels of AFP.
doi:10.1038/modpathol.3800146 pmid:15098015 fatcat:6ecvkbxl6vhgld25mwjibxmcbe

Erratum: Overexpression of caspase-3 in hepatocellular carcinomas

Rajendra Persad, Chen Liu, Tsung-Teh Wu, Patrick S Houlihan, Stanley R Hamilton, Anna Mac Diehl, Asif Rashid
2004 Modern Pathology  
doi:10.1038/modpathol.3800215 fatcat:o46tyqnmvbagbclvqiqgmeucoe

A Review of Benchmark Experiments for the Validation of Peridynamics Models

Patrick Diehl, Serge Prudhomme, Martin Lévesque
2019 Journal of Peridynamics and Nonlocal Modeling  
For this example, Diehl et al.  ...  Diehl et al. [34] compared the predicted wave speed of the damage front with that measured in [121] [122] [123] and reported a relative error e r of 10%. Diehl et al.  ... 
doi:10.1007/s42102-018-0004-x fatcat:fssqep7mmnb6ndha2jlaveqmlu

Towards a Scalable and Distributed Infrastructure for Deep Learning Applications [article]

Bita Hasheminezhad, Shahrzad Shirzad, Nanmiao Wu, Patrick Diehl, Hannes Schulz, Hartmut Kaiser
2020 arXiv   pre-print
Although recent scaling up approaches to train deep neural networks have proven to be effective, the computational intensity of large and complex models, as well as the availability of large-scale datasets require deep learning frameworks to utilize scaling out techniques. Parallelization approaches and distribution requirements are not considered in the primary designs of most available distributed deep learning frameworks and most of them still are not able to perform effective and efficient
more » ... ine-grained inter-node communication. We present Phylanx that has the potential to alleviate these shortcomings. Phylanx presents a productivity-oriented frontend where user Python code is translated to a futurized execution tree that can be executed efficiently on multiple nodes using the C++ standard library for parallelism and concurrency (HPX), leveraging fine-grained threading and an active messaging task-based runtime system.
arXiv:2010.03012v1 fatcat:2hy7evtvdra2dotv35dvbhv7mu

Perception of Cantonese Parkinsonian speech

Patrick C. M. Wong, Randy L. Diehl, Shu Leong Ho, Leonard S. W. Li, Kin Lun Tsang
2001 Journal of the Acoustical Society of America  
Patrick C. M. Wong, Randy L. Diehl ͑Dept. of Psych., Univ. of Texas, Austin, TX 78712͒, Shu Leong Ho, Leonard S. W.  ...  Diehl, J. Acoust. Soc. Am. 105, 1246͑A͒ ͑1999͔͒.  ... 
doi:10.1121/1.4744131 fatcat:c6nmo776sjeurm5oyvedt6fnpy

NuGrid: Toward High Precision Double-Degenerate Merger Simulations with SPH in 3D [article]

Steven Diehl, Aimee Hungerford , Raphael Hirschi , Francis X. Timmes , Patrick Motl Los Alamos National Laboratory, Keele University, Louisiana State University
2008 arXiv   pre-print
For more details, refer to Fryer & Diehl (2008) . Figure 3 : 3 SPH simulation of the q = 1.3 merger simulation with an ideal gas equation of state.  ...  ., 2006; Diehl et al., 2008a) . In this work, we put particular emphasis on the importance of appropriate initial conditions and the effects of shocks in the equation of state.  ... 
arXiv:0811.4646v1 fatcat:jriajsor7refdcdckc7qyiiape
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