The topological structure of 2D disordered cellular systems

We analyze the structure of two dimensional disordered cellular systems generated by extensive computer simulations. These cellular structures are studied as topological trees rooted on a central cell or as closed shells arranged concentrically around a germ cell. We single out the most significant parameters that characterize statistically the organization of these patterns. Universality and specificity in disordered cellular structures are discussed.Comment: 18 Pages LaTeX, 16 Postscript figure

Entwicklung eines instationären Prognosewerkzeuges zur Berechnung der Klimawandelbedingten Veränderungen der Grundwasserneubildung

Im Forschungs- und Netzwerkprojekt dynaklim untersucht die Emschergenossenschaft u. a. die wasserwirtschaftlichen Auswirkungen von klimabedingten Veränderungen des Grundwasserhaushalts in den urbanen Siedlungsgebieten. Dazu sollen mit Hilfe der vorliegenden numerischen Grundwassermodelle unter Berücksichtigung der Realisationsergebnisse des regionalen Klimamodells COSMOCLM realistische Auswirkungsszenarien und Anpassungsstrategien für die Siedlungsentwässerung abgeleitet werden. Zur Abbildung der innerjährlichen Verschiebungen der Niederschläge ist es erforderlich, die Grundwasserneubildung als ausschlaggebende Wasserhaushaltsgröße für die Modellierung instationär und flächendifferenziert zu berechnen. Da bislang keine verifizierten instationären Wasserhaushaltsmodellansätze verfügbar sind, wurde in Anlehnung an die bisher bekannten Verfahren ein geeignetes Werkzeug entwickelt, dass bei der instationären Erweiterung der stationär kalibrierten Grundwassermodelle die Massenbilanz erhält. Die damit durchgeführten stationären und instationären Nachkalibrierungen der Grundwassermodelle weisen eine gute Anpassung auf. Aus der klimatischen Bodenwasserbilanz wurden Trends bis zu den Jahren 2050 und 2100 im Emschergebiet berechnet. Im Ergebnis ist zu erwarten, dass die Grundwasserstände größeren innerjährlichen Schwankungen unterliegen werden als heute

Modeling of Speech-dependent Own Voice Transfer Characteristics for Hearables with In-ear Microphones

Hearables often contain an in-ear microphone, which may be used to capture the own voice of its user. However, due to ear canal occlusion the in-ear microphone mostly records body-conducted speech, which suffers from band-limitation effects and is subject to amplification of low frequency content. These transfer characteristics are assumed to vary both based on speech content and between individual talkers. It is desirable to have an accurate model of the own voice transfer characteristics between hearable microphones. Such a model can be used, e.g., to simulate a large amount of in-ear recordings to train supervised learning-based algorithms aiming at compensating own voice transfer characteristics. In this paper we propose a speech-dependent system identification model based on phoneme recognition. Using recordings from a prototype hearable, the modeling accuracy is evaluated in terms of technical measures. We investigate robustness of transfer characteristic models to utterance or talker mismatch. Simulation results show that using the proposed speech-dependent model is preferable for simulating in-ear recordings compared to a speech-independent model. The proposed model is able to generalize better to new utterances than an adaptive filtering-based model. Additionally, we find that talker-averaged models generalize better to different talkers than individual models.Comment: 18 pages, 11 figures; Extended version of arXiv:2309.08294 (more detailed description of the problem, additional models considered, more systematic evaluation conducted on a different, larger dataset

Summary of grazing research on Kansas CRP land

Animal performance and n et return per acre were examined for four CRP research sites in Kansas in 1 994, 1995, and 1996. Both mowing and prescribed burning increased animal performance in 1994. Mowing was economically feasible on one of the four sites. Prescribed burning was economically feasible on three of four sites. Mowing and burning treatments were not repeated i n 1995 or 1996. Net returns per acre for the site that was grazed with cowcalf pairs ranged from -$8.55 to -$25.54. For the sites grazed with stockers, net returns per acre varied from -$18.67 to$31 .39. Net returns per acre for stockers averaged $14.2 2 in western Kansas and$16.93 in central Kansas. Based on this research, grazing stockers on post-CRP land appears to have more potential than grazing cow-calf pairs

Complex Networks on Hyperbolic Surfaces

We explore a novel method to generate and characterize complex networks by means of their embedding on hyperbolic surfaces. Evolution through local elementary moves allows the exploration of the ensemble of networks which share common embeddings and consequently share similar hierarchical properties. This method provides a new perspective to classify network-complexity both on local and global scale. We demonstrate by means of several examples that there is a strong relation between the network properties and the embedding surface.Comment: 8 Pages 3 Figure

MF2334

Paul D. Ohlenbush, James W. Kunkel & Brad Williams, Prescribed burning programs, Kansas State University, April 1998

MF2078

Paul D. Ohlenbusch, Michael R. Langemeier and Steve L. Watson, CRP evaluating the options, Kansas State University, March 1995

Characterization of two common 5' polymorphisms in PEX1 and correlation to survival in PEX1 peroxisome biogenesis disorder patients

<p>Abstract</p> <p>Background</p> <p>Mutations in PEX1 are the most common primary cause of Zellweger syndrome. In addition to exonic mutations, deletions and splice site mutations two 5' polymorphisms at c.-137 and c.-53 with a potential influence on PEX1 protein levels have been described in the 5' untranslated region (UTR) of the <it>PEX1 </it>gene.</p> <p>Methods</p> <p>We used RACE and in silico promoter prediction analysis to study the 5' UTR of <it>PEX1</it>. We determined the distribution of <it>PEX1 </it>5' polymorphisms in a cohort of 30 Zellweger syndrome patients by standard DNA sequencing. 5' polymorphisms were analysed in relation to the two most common mutations in <it>PEX1 </it>and were incorporated into a novel genotype-phenotype analysis by correlation of three classes of <it>PEX1 </it>mutations with patient survival.</p> <p>Results</p> <p>We provide evidence that the polymorphism 137 bp upstream of the ATG codon is not part of the UTR, rendering it a promoter polymorphism. We show that the first, but not the second most common <it>PEX1 </it>mutation arose independently of a specific upstream polymorphic constellation. By genotype-phenotype analysis we identified patients with identical exonic mutation and identical 5' polymorphisms, but strongly differing survival.</p> <p>Conclusions</p> <p>Our study suggests that two different types of <it>PEX1 </it>5' polymorphisms have to be distinguished: a 5' UTR polymorphism at position c.-53 and a promoter polymorphism 137 bp upstream of the PEX1 start codon. Our results indicate that the exonic <it>PEX1 </it>mutation correlates with patient survival, but the two 5' polymorphisms analysed in this study do not have to be considered for diagnostic and/or prognostic purposes.</p