1,334 research outputs found
Lymphadenitis caused by non-tuberculous Mycobacterium in a university hospital in Taiwan: predominance of rapidly growing Mycobacteria and high recurrence rate
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EFFECTS OF DEEP CENTERS AT PT SI INTERFACES AND HYDROGENATION
No full textElectrical measurements were combined with surface techniques to study the Pt/Si interfaces at various silicide formation temperatures. Effects of deep centers on the Schottky barrier heights were studied. Hydrogen plasma treatment was used to passivate the impurity/defect centers at the interfaces, and the effects of hydrogenation on the Schottky barrier heights were also examined. Combining our previous study on the Pt/Si interfacial reaction, factors influencing the PtSi/Si Schottky barrier diode are discussed
LW-MS-LFTFNet: A Lightweight Multi-Scale Network Integrating Low-Frequency Temporal Features for Ship-Radiated Noise Recognition
No full textShip-radiated noise (SRN) recognition is vital for underwater acoustics, with applications in both military and civilian fields. Traditional manual recognition by sonar operators is inefficient and error-prone, motivating the development of automated recognition systems. However, most existing deep learning approaches demand high computational resources, limiting their deployment on resource-constrained edge devices. To overcome this challenge, we propose LW-MS-LFTFNet, a lightweight model informed by time-frequency analysis of SRN that highlights the critical role of low-frequency components. The network integrates a multi-scale depthwise separable convolutional backbone with CBAM attention for efficient spectral representation, along with two LSTM-based modules to capture temporal dependencies in low-frequency bands. Experiments on the DeepShip dataset show that LW-MS-LFTFNet achieves 75.04% accuracy with only 0.85 M parameters, 0.38 GMACs, and 3.27 MB of storage, outperforming representative lightweight architectures. Ablation studies further confirm that low-frequency temporal modules contribute complementary gains, improving accuracy by 2.64% with minimal overhead. Guided by domain-specific priors derived from time-frequency pattern analysis, LW-MS-LFTFNet achieves efficient and accurate SRN recognition with strong potential for edge deployment
LW-DETR: A Transformer Replacement to YOLO for Real-Time Detection
Full text linkIn this paper, we present a light-weight detection transformer, LW-DETR,
which outperforms YOLOs for real-time object detection. The architecture is a
simple stack of a ViT encoder, a projector, and a shallow DETR decoder. Our
approach leverages recent advanced techniques, such as training-effective
techniques, e.g., improved loss and pretraining, and interleaved window and
global attentions for reducing the ViT encoder complexity. We improve the ViT
encoder by aggregating multi-level feature maps, and the intermediate and final
feature maps in the ViT encoder, forming richer feature maps, and introduce
window-major feature map organization for improving the efficiency of
interleaved attention computation. Experimental results demonstrate that the
proposed approach is superior over existing real-time detectors, e.g., YOLO and
its variants, on COCO and other benchmark datasets. Code and models are
available at (https://github.com/Atten4Vis/LW-DETR)
Sprachen mit Zahlklassifikatoren: Analyse und Vergleich
No full textDas Ziel dieser Arbeit besteht zunächst darin, in einem 1. Teil das Phänomen 'Zahlklassifikator' zu explizieren und an Beispielen – vornehmlich aus den Sprachen Südostasiens – zu erläutern. Im 2. Teil werden dann Sprachen Ozeaniens und Mayasprachen Mittelamerikas, die nicht als 'typische' Klassifikatorsprachen gelten, dargestellt und anhand der im 10 Teil entwickelten Begriffe, diskutiert. Den Ausgangspunkt der Überlegungen bildet die Arbeit von Greenberg (1972) über Zahlklassifikatoren, deren Thesen im 1. Teil dargestellt und kommentiert werden. Die theoretische Grundlage dieser Arbeit ist die Universalienkonzeption, wie sie dem Kölner Forschungsprojekt für Universalien und Typologie (UNITYF) zugrunde liegt. Der besondere Rahmen, in dem die Bearbeitung dieses Themas steht, ist die Dimension der 'Individuation', bei der es um Prozesse zur 'Erfassung von Gegenständen' geht. (Zu den theoretischen Grundlagen von UNITYF und dem Begriff der Dimension siehe Seiler (1977 (a) und (b).
Contributions of large wood to the initial establishment and diversity of riparian vegetation in a bar-braided temperate river
Full text linkThe purpose of this study was to examine the effects of large wood (LW) on the physical environment and the initial establishment of vascular plant species in the Rekifune River, a large bar-braided monsoonal river in Japan. The physical environment and the diversity and composition of plant species were compared in relation to the orientation of LW pieces. We found that shading effects were more prevalent in the immediate vicinity of LW pieces than in quadrats distant from LW. The effect was especially strong at the center of LW jams (the "jam center"). Fine sand and silt were concentrated in the quadrats downstream from the LW pieces. In contrast, cobbles dominated the upstream quadrats. The highest diversity was found in the jam center, while intermediate values were observed in the quadrats surrounding LW. Indicator species analysis detected 21 indicator species only in the jam center. The LW jams favored the deposition of plant fragments and sediment and created shaded areas within and around the structures. Buried seeds may be transported with LW during a flood, and seeds dispersed by wind and stream flows may be trapped by the complex structure of LW jams. The specific environmental conditions and the trapping of seeds and plant fragments result in the early establishment of mid-successional tree species at LW jams. In conclusion, the LW pieces deposited on gravel bars altered the light and substrate conditions and thereby provided specific safe sites for various riparian plant species
An f/0.27 High-Gain Lens Antenna for Ultrasmall Platforms at THz Frequencies
No full textThe development of a low focal number and low-mass lens antenna is presented that enables terahertz spectroscopy applications on ultracompact platforms. The antenna operates efficiently over a 20% fractional bandwidth, from 450 to 550 GHz, with a gain of 50 dBi at 500 GHz. The antenna consists of a hyperbolic silicon lens that is placed in a record low focal number configuration (f#=0.27) with respect to an advanced waveguide feed. An incident field-matching analysis is applied to investigate the optimal feed radiation pattern that maximizes the lens aperture efficiency, which would result in a 20% increase in aperture efficiency (> 80%) with respect to a standard open-ended waveguide (< 60% aperture efficiency). A multilayer leaky-wave (LW) stratification is quasi-analytically optimized to approximate the optimal feeding pattern, resulting in a >70% lens aperture efficiency. An example LW stratification is synthesized using silicon micromachining technology and is fully characterized in combination with the dielectric lens. Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Tera-Hertz Sensin
Precipitation patterns control the distribution and export of large wood at the catchment scale
Full text linkLarge wood (LW) plays an important role in river ecosystems, but LW-laden floods may cause serious damage to human lives and property. The relationship between precipitation patterns and variations in LW distribution and export at the watershed scale is poorly understood. To explore these linkages, we examined differences in LW distribution as a function of channel morphologies in six watersheds located in southern and northern Japan and analysed the impacts of different precipitation patterns on the fluvial export of LW from river catchments. In southern Japan, intense rainfalls caused by typhoons or localized torrential downpours initiate landslides and debris flows that introduce massive amounts of LW into channels. Gravel bars formed by frequent flood events are widely prevalent, and the LW temporarily stored on these bars is frequently moved and/or broken into smaller pieces by floods. In these systems fluvial export of LW is supply-limited, with smaller accumulations and shorter residence times than in northern Japan. Conversely, in northern Japan, where typhoons and torrential downpours rarely occur, LW is mostly recruited by bank erosion, tree mortality and windthrow into channels, rather than by landslides and debris flows. Recruited pieces accumulate in log jams on valley floors, particularly on floodplains supporting mature forests, resulting in larger accumulations and longer residence times. In these watersheds fluvial export of LW is transport-limited, and the pieces gradually decompose during long-term storage as log jams. Copyright (C) 2015 John Wiley & Sons, Ltd
Porcine LIF gene polymorphisms and their association with litter size traits in four pig breeds
Full text linkLeukemia inhibitory factor (LIF) is an important productivity-related gene in pigs. We found two polymorphisms — g.6646C>T and g.6988C>T — in exon 3 of LIF in pigs by using DNA sequencing and polymerase chain reaction-restriction fragment length polymorphism. Three genotypes were obtained and associated with litter size traits in Anqing Six-end-white (AQ), Wei (W), Wannan Black (WNB), and Large White (LW) pigs. At locus g.6646C>T, the g.6646C allele frequency variation was 0.6869 (AQ), 0.7473 (W), 1 (WNB), and 0.6852 (LW). In AQ pigs, sows with the TT genotype had higher total number of piglets born (TNB) and number of piglets born alive (NBA) in the first parity and multiparities (P T, the g.6988C allele frequency variation was 1 (AQ), 0.6154 (W), 1 (WNB), and 0.6667 (LW). The CC genotype significantly differed from CT or TT genotypes (P T and g.6988C>T loci of LIF could be potential marker-assisted selection tools for improving litter size in pig production.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
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