377 research outputs found
Northern Barbados accretionary prism: Structure, deformation, and fluid flow interpreted from 3D seismic and well-log data
We reanalyzed 3D seismic reflection and logging-while-drilling data from the toe
of the northern Barbados accretionary prism to interpret structure, deformation, and fluid
flow related to subduction processes. The seafloor amplitude and coherence reveal an
abrupt change in the thrust orientation from NNE at the thrust front and north and NNW
about 5 km west of the thrust front. These thrust sets are separated by a triangular-shaped
quiet area, which may represent a zone of low strength. The northeast-trending band of
strong negative amplitude and high coherence in the décollement, known to be an interval
of arrested consolidation, overlaps the quiet area, suggesting that the arrested consolidation
may be related to the lack of thrust imbrication, and thus, vertical drainage for fluid
in the accretionary prism. Fractal analysis of the décollement and top of the subducting
oceanic basement indicates that the relief of the décollement correlates with the topography
of the oceanic basement. Differential compaction of the underthrust sediment overlying
the rugged oceanic basement, together with the basement faults that penetrate into the
décollement probably caused relief or even faulting in the décollement
SoEasy: A Software Framework for Easy Hardware Control Programming for Diverse IoT Platforms
Many Internet of Things (IoT) applications are emerging and evolving rapidly thanks to widespread open-source hardware platforms. Most of the high-end open-source IoT platforms include built-in peripherals, such as the universal asynchronous receiver and transmitter (UART), pulse width modulation (PWM), general purpose input output (GPIO) ports and timers, and have enough computation power to run embedded operating systems such as Linux. However, each IoT platform has its own way of configuring peripherals, and it is difficult for programmers or users to configure the same peripheral on a different platform. Although diverse open-source IoT platforms are widespread, the difficulty in programming those platforms hinders the growth of IoT applications. Therefore, we propose an easy and convenient way to program and configure the operation of each peripheral using a user-friendly Web-based software framework. Through the implementation of the software framework and the real mobile robot application development along with it, we show the feasibility of the proposed software framework, named SoEasy
First Demonstration of Ultra-Thin SiGe-Channel Junctionless Accumulation-Mode (JAM) Bulk FinFETs on Si Substrate with PN Junction-Isolation Scheme
A SiGe-channel junctionless-accumulation-mode (JAM) PMOS bulk FinFETs were successfully demonstrated on Si substrate with PN junction-isolation scheme for the first time. The JAM bulk FinFETs with fin width of 18 nm exhibits excellent subthreshold characteristics such as subthreshold swing of 64 mV/decade, drain-induced barrier lowering (DIBL) of 40 mV/V and high Ion/Ioff current ratio ( \u3e 1 x 105). The change of substrate bias from 0 to 5 V leads to the threshold voltage shift of 53 mV by modulating the effective channel thickness. When compared to the Si-channel bulk FinFETs with fin width of 18 nm, Si and SiGe channel devices exhibits comparable subthreshold swing and DIBL. For devices with longer fin width, SiGe channel devices exhibits much lower DIBL, indicating superior top-gate controllability and robustness to substrate bias compared to the Si channel devices. A zero temperature coefficient point was observed in the transfer curves as temperature increases from -120 to 120°C, confirming that mobility degradation is dominantly affected by phonon scattering mechanism
The cortical activation pattern by a rehabilitation robotic hand: a functional NIRS study
Introduction: Clarification of the relationship between external stimuli and brain response has been an important topic in neuroscience and brain rehabilitation. In the current study, using functional near infrared spectroscopy (fNIRS), we attempted to investigate cortical activation patterns generated during execution of a rehabilitation robotic hand. Methods: Ten normal subjects were recruited for this study. Passive movements of the right fingers were performed using a rehabilitation robotic hand at a frequency of 0.5 Hz. We measured values of oxy-hemoglobin (HbO), deoxy-hemoglobin (HbR) and total-hemoglobin (HbT) in five regions of interest: the primary sensory-motor cortex (SM1), hand somatotopy of the contralateral SM1, supplementary motor area (SMA), premotor cortex (PMC), and prefrontal cortex (PFC). Results: HbO and HbT values indicated significant activation in the left SM1, left SMA, left PMC, and left PFC during execution of the rehabilitation robotic hand (uncorrected, p < 0.01). By contrast, HbR value indicated significant activation only in the hand somatotopic area of the left SM1 (uncorrected, p < 0.01). Conclusions: Our results appear to indicate that execution of the rehabilitation robotic hand could induce cortical activation. © 2014 Chang, Lee, Gu, Lee, Jin, Yeo, Seo and Jang.1
Polymorphisms in Apoptosis-Related Genes and TP53 Mutations in Non-Small Cell Lung Cancer
Apoptosis plays an essential role in the elimination of mutated or transformed cells from the body. Therefore, polymorphisms of apoptosis-related genes may lead to an alteration in apoptotic capacity, thereby affecting the occurrence of TP53 mutations in lung cancer. We investigated the relationship between potentially functional polymorphisms of apoptosis-related genes and TP53 mutations in non-small cell lung cancer (NSCLC). Twenty-seven single nucleotide polymorphisms in 20 apoptosis-related genes were genotyped by a sequenome mass spectrometry-based genotyping assay in 173 NSCLCs and the associations with TP53 mutations in the entire coding exons (exons 2-11), including splicing sites of the gene, were analyzed. None of the 27 polymorphisms was significantly associated with the occurrence of TP53 mutations. This suggests that apoptosis-related genes may not play an important role in the occurrence of TP53 mutations in lung cancer
Performance Analysis of Relative Positioning using GPS and BDS signals
In general, the satellite signal received by GNSS receivers has errors such as satellite clock error, orbit error, ionospheric delay and tropospheric delay. In environments where high positioning accuracy is required, these error factors can be eliminated by using relative positioning using code measurements with carrier phase measurements. If relative positioning is performed using carrier phase measurements, it is possible to have positioning accuracy of cm level. In this paper, we analyse the positioning accuracy of relative positioning using the L1 signal of GPS and BDS. For this study, we collect GPS and BDS signal using two low-cost receivers. We also designed a software-based platform to perform the relative positioning. Finally, we analyse relative positioning accuracy for GPS/BDS integrated system as well as relative positioning accuracy for GPS and BDS
Performance analysis of GPS / Radar integrated navigation system
GPS is used in various navigation fields. However, visibility is lowered in such an environment as urban canyon, and navigation performance deteriorates due to the visibility, multipath effect. So, in order to improve navigation performance in this environment, methods of integration with other sensors have been studied. In this paper, we use radar to measure the range of the landmark with known position. An integration algorithm is designed using GPS pseudorange and radar measurement
Atomic arrangement of van der Waals heterostructures using X-ray scattering and crystal truncation rod analysis
Vanadium diselenide (VSe2) has intriguing physical properties such as
unexpected ferromagnetism at the two-dimensional limit. However, the
experimental results for room temperature ferromagnetism are still
controversial and depend on the detailed crystal structure and stoichiometry.
Here we introduce crystal truncation rod (CTR) analysis to investigate the
atomic arrangement of bilayer VSe2 and bilayer graphene (BLG) hetero-structures
grown on a 6H-SiC(0001) substrate. Using non-destructive CTR analysis, we were
able to obtain electron density profiles and detailed crystal structure of the
VSe2/BLG heterostructures. Specifically, the out-of-plane lattice parameters of
each VSe2 layer were modulated by the interface compared to that of the bulk
VSe2 1T phase. The atomic arrangement of the VSe2/BLG heterostructure provides
deeper understanding and insight for elucidating the magnetic properties of the
van der Waals heterostructure.Comment: 17 pages, 4 figure
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