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Journal articles on the topic 'NLSMs'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Pandey, Vivek, and Pankaj Bhalla. "Reshaping the anomalous Hall response in tilted 3D system with disorder correction." New Journal of Physics 27, no. 7 (2025): 073501. https://doi.org/10.1088/1367-2630/ade46a.

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Abstract The anomalous Hall conductivity (AHC) in the nodal line semimetals (NLSMs) due to the presence of a symmetry-protected nodal ring adds complexity in the investigation of their transport properties. By employing quantum kinetic theory and considering the weak disorder limit, we analyze the intraband and interband parts of AHC in the tilted 3D Dirac NLSMs. Our findings reveal that the net anomalous response is mainly contributed by the interband part. Further, the latter part gives non zero results by breaking inversion symmetry via tilt. We observe that the competition between the tilt

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Gao, Peng, Guangming Zhang, and Xiaodong Lv. "Model-Free Control Using Improved Smoothing Extended State Observer and Super-Twisting Nonlinear Sliding Mode Control for PMSM Drives." Energies 14, no. 4 (2021): 922. http://dx.doi.org/10.3390/en14040922.

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This paper proposes a novel model-free super-twisting nonlinear sliding mode control (MFSTNLSMC) strategy with an improved smoothing extended state observer (SESO) for permanent magnet synchronous motor (PMSM) drives. First of all, the improved SESO is introduced to estimate the unknown term of the PMSM ultra-local model. Secondly, a novel nonlinear sliding mode surface (NLSMS) is designed, which can effectively overcome the disadvantages of simple and rough signal processing of the conventional linear sliding mode surface. At the same time, a super-twisting (ST) structure is chosen to suppres

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Hu, Jin, Su-Yang Xu, Ni Ni, and Zhiqiang Mao. "Transport of Topological Semimetals." Annual Review of Materials Research 49, no. 1 (2019): 207–52. http://dx.doi.org/10.1146/annurev-matsci-070218-010023.

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Three-dimensional (3D) topological semimetals represent a new class of topological matters. The study of this family of materials has been at the frontiers of condensed matter physics, and many breakthroughs have been made. Several topological semimetal phases, including Dirac semimetals (DSMs), Weyl semimetals (WSMs), nodal-line semimetals (NLSMs), and triple-point semimetals, have been theoretically predicted and experimentally demonstrated. The low-energy excitation around the Dirac/Weyl nodal points, nodal line, or triply degenerated nodal point can be viewed as emergent relativistic fermi

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Li, Peggy P., Akira Nakanishi, Dorothy Shum, et al. "Simian Virus 40 Vp1 DNA-Binding Domain Is Functionally Separable from the Overlapping Nuclear Localization Signal and Is Required for Effective Virion Formation and Full Viability." Journal of Virology 75, no. 16 (2001): 7321–29. http://dx.doi.org/10.1128/jvi.75.16.7321-7329.2001.

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ABSTRACT A DNA-binding domain (DBD) was identified on simian virus 40 (SV40) major capsid protein Vp1, and the domain's function in the SV40 life cycle was examined. The DBD was mapped by assaying various recombinant Vp1 proteins for DNA binding in vitro. The carboxy-terminal 58-residue truncated Vp1ΔC58 pentamer bound DNA with aKd of 1.8 × 10−9 M in terms of the protein pentamer, while full-length Vp1 and carboxy-terminal-17-truncated Vp1ΔC17 had comparable apparentKd s of 5.3 × 10−9 to 7.3 × 10−9 M in terms of the protein monomers. Previously identified on Vp1 was a nuclear localization sign

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Köppen-Rung, Pánja, Alexandra Dittmer, and Elke Bogner. "Intracellular Distribution of Capsid-Associated pUL77 of Human Cytomegalovirus and Interactions with Packaging Proteins and pUL93." Journal of Virology 90, no. 13 (2016): 5876–85. http://dx.doi.org/10.1128/jvi.00351-16.

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ABSTRACTDNA packaging into procapsids is a common multistep process during viral maturation in herpesviruses. In human cytomegalovirus (HCMV), the proteins involved in this process are terminase subunits pUL56 and pUL89, which are responsible for site-specific cleavage and insertion of the DNA into the procapsid via portal protein pUL104. However, additional viral proteins are required for the DNA packaging process. We have shown previously that the plasmid that encodes capsid-associated pUL77 encodes another potential player during capsid maturation. Pulse-chase experiments revealed that pUL7

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Berton, M., E. Congiu, E. Järvelä, et al. "Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective." Astronomy & Astrophysics 614 (June 2018): A87. http://dx.doi.org/10.1051/0004-6361/201832612.

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We report the first results of a survey on 74 narrow-line Seyfert 1 galaxies (NLS1s) carried out in 2015 with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A-configuration. So far, this is the largest survey aimed to image the radio continuum of NLS1s. We produced radio maps in order to compare the general properties of three different samples of objects: radio-quiet NLS1s (RQNLS1s), steep-spectrum radio-loud NLS1s (S-NLS1s), and flat-spectrum radio-loud NLS1s (F-NLS1s). We find that the three classes correspond to different radio morphologies, with F-NLS1s being more compact, and RQN

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Fan, Xu-Liang. "Mid-infrared Properties of Narrow-line Seyfert 1 Galaxies Detected by LoTSS DR2." Astrophysical Journal 966, no. 1 (2024): 53. http://dx.doi.org/10.3847/1538-4357/ad3067.

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Abstract Narrow-line Seyfert 1 galaxies (NLS1s), a subclass of active galactic nuclei (AGNs) in an early stage of the accretion process, are also found to host relativistic jets. However, currently known jetted NLS1s are rare. The majority of NLS1s are undetected at the radio band. The radio detection rate of NLS1s increases with the LOFAR Two-metre Sky Survey (LoTSS), which provides a good opportunity for finding more jetted NLS1s. The better sensitivity raises the question whether the radio emission of NLS1s with a low radio luminosity originates from the jet activity. In order to clarify th

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Pan, Xiang, Hongyan Zhou, and Peng Jiang. "Obscuration and Scattering in Narrow-Line Seyfert 1s." Universe 6, no. 6 (2020): 73. http://dx.doi.org/10.3390/universe6060073.

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Narrow-line Seyfert 1s (NLS1s) observed at large inclinations from face-on are important for understanding this amazing AGN subclass. However, progress is slowly being made in the huntings and studies of highly obscured (EB–V ≥ 1) NLS1s. Recently, we discovered that multi-wavelength photometric and polarimetric analysis can be of great help in identifying and studying highly obscured NLS1s. This paper presents an intercomparison study of three typical highly obscured NLS1s. By joint analysis of extinction, absorption lines, and scattered AGN radiation, properties of the nucleus (disk and broad

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Chen, S., E. Järvelä, L. Crepaldi, et al. "Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations*." Monthly Notices of the Royal Astronomical Society 498, no. 1 (2020): 1278–97. http://dx.doi.org/10.1093/mnras/staa2373.

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ABSTRACT We present the results of new radio observations carried out with the Karl G. Jansky Very Large Array C-configuration at 5.5 GHz for a sample of southern narrow-line Seyfert 1 galaxies (NLS1s). This work increases the number of known radio-detected NLS1s in the Southern hemisphere, and confirms that the radio emission of NLS1s is mainly concentrated in a central region at kpc-scale and only a few sources show diffuse emission. In radio-quiet NLS1s, the radio luminosity tends to be higher in steep-spectrum sources and be lower in flat-spectrum sources, which is opposite to radio-loud N

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Wang, Yanyan, and Yingsong Li. "Sparse Multipath Channel Estimation Using Norm Combination Constrained Set-Membership NLMS Algorithms." Wireless Communications and Mobile Computing 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/8140702.

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A norm combination penalized set-membership NLMS algorithm with l0 and l1 independently constrained, which is denoted as l0 and l1 independently constrained set-membership (SM) NLMS (L0L1SM-NLMS) algorithm, is presented for sparse adaptive multipath channel estimations. The L0L1SM-NLMS algorithm with fast convergence and small estimation error is implemented by independently exerting penalties on the channel coefficients via controlling the large group and small group channel coefficients which are implemented by l0 and l1 norm constraints, respectively. Additionally, a further improved L0L1SM

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Kawaguchi, Toshihiro, K. Nakanishi, K. Kohno, K. Ohta, and K. Aoki. "12CO observations on narrow-line Seyfert 1 galaxies." Proceedings of the International Astronomical Union 3, S245 (2007): 249–50. http://dx.doi.org/10.1017/s174392130801781x.

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AbstractIn order to investigate how the growth of galactic bulges is accompanied with the growth of central black holes (BHs), we observed molecular gas (fuel for the coming star formation) in possibly young active galaxies, narrow-line Seyfert 1 galaxies (NLS1s). We present the results of pilot observations of 12CO (1→0) line using the Nobeyama Millimeter Array for two FIR-bright NLS1s, ending in the first detection of their CO emission. Corresponding molecular-gas masses M(H2) of (1−3)×109M⊙ are the 2nd and 4th largest ones among NLS1s. Together with CO data for other NLS1s (including our su

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Li, Yingsong, Zhan Jin, and Yanyan Wang. "Adaptive Channel Estimation Based on an Improved Norm-Constrained Set-Membership Normalized Least Mean Square Algorithm." Wireless Communications and Mobile Computing 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/8056126.

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An improved norm-constrained set-membership normalized least mean square (INCSM-NLMS) algorithm is proposed for adaptive sparse channel estimation (ASCE). The proposed INCSM-NLMS algorithm is implemented by incorporating an lp-norm penalty into the cost function of the traditional set-membership normalized least mean square (SM-NLMS) algorithm, which is also denoted as lp-norm penalized SM-NLMS (LPSM-NLMS) algorithm. The derivation of the proposed LPSM-NLMS algorithm is given theoretically, resulting in a zero attractor in its iteration. By using this proposed zero attractor, the convergence s

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Che, Hussin Che Haziqah, Adem Kilicman, and Amirah Azmi. "ANALYTICAL SOLUTIONS OF NONLINEAR SCHRODINGER EQUATIONS USING MULTISTEP MODIFIED REDUCED DIFFERENTIAL TRANSFORM METHOD." COMPUSOFT: An International Journal of Advanced Computer Technology 07, no. 11 (2018): 2939–44. https://doi.org/10.5281/zenodo.14810994.

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This paper aims to propose and implement the Multistep Modified Reduced Differential Transform Method (MMRDTM) to find solution of Nonlinear Schrodinger Equations (NLSEs). Through the proposed technique, we replaced the nonlinear term in the NLSEs by the corresponding Adomian polynomials prior applying the multistep approach. Thus, we can obtain solutions for the NLSEs in easier way with less complexity. In addition, the solutions can be approximated more accurately over a longer time frame. We considered several NLSEs and illustrate the features of these solutions in the form of graphs in ord

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Fan, Xu-Liang. "Revisiting the Fraction of Radio-Loud Narrow Line Seyfert 1 Galaxies with LoTSS DR1." Universe 6, no. 3 (2020): 45. http://dx.doi.org/10.3390/universe6030045.

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Radio-Loud narrow-line Seyfert 1 galaxies (NLS1s), especially the extremely radio-loud ones, are widely accepted as the jetted versions of NLS1s. We explore the radio-loud fraction for NLS1s with recently released LoTSS DR1 at 150 MHz. The radio detection rate is about 28% for LoTSS DR1. The radio detected NLS1s have lower redshift than the non-detected ones. Moreover, the 150 MHz radio luminosities of NLS1s detected by LoTSS are about two orders of magnitude weaker than those of the previous samples. By defining the radio loudness with the ratio between 150 MHz radio flux and SDSS r band flux

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Järvelä, E., R. Dahale, L. Crepaldi, M. Berton, E. Congiu, and R. Antonucci. "Unravelling the origin of extended radio emission in narrow-line Seyfert 1 galaxies with the JVLA." Astronomy & Astrophysics 658 (January 25, 2022): A12. http://dx.doi.org/10.1051/0004-6361/202141698.

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Narrow-line Seyfert 1 galaxies (NLS1s) are believed to be active galactic nuclei (AGN) in the early stages of their evolution. Several dozen of them have been found to host relativistic jets, whilst the majority of NLS1s have not even been detected in radio, emphasising the heterogeneity of the class in this band. In this paper, our aim is to determine the predominant source of radio emission in a sample of 44 NLS1s, selected based on their extended kiloparsec-scale radio morphologies at 5.2 GHz. We accomplish this by analysing their spatially resolved radio spectral index maps, centred at 5.2

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Chang, Chiung-Wen, Rafael Couñago, Simon Williams, Mikael Bodén, and Boštjan Kobe. "Importin alpha and nonclassical nuclear localization signal." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1634. http://dx.doi.org/10.1107/s205327331408365x.

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In the classical nuclear import pathway, the specific recognition between the nuclear receptor (importin-α) and the nuclear localization signals (NLSs) plays an essential role on facilitating the cargo import process. Importin-α has two separate NLS-binding sites (the major and the minor sites), accommodate NLSs, comprising of one (monopartite) or two clusters (bipartite) of basic residues connected by a 10 - 12 residue linker. The major NLS-binding site is the preferential binding site for most of the monopartite NLSs characterized to date. By screening random peptide libraries using importin

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Boller, Thomas. "Forty Years of X-Raying Narrow-Line Seyfert 1 Galaxies." Acta Polytechnica CTU Proceedings 1, no. 1 (2014): 79–83. http://dx.doi.org/10.14311/app.2014.01.0079.

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Forty years after the discovery of Narrow-Line Seyfert 1 Galaxies (NLS1s), and 20 years since the discovery of the remarkable ultrasoft soft X-ray emissions of NLS1s, strategic publications improved the understanding of the Seyfert phenomenon more generally. New theoretical models emerged from the observations and stimulated the discussions on the innermost regions of AGN. NLS1s are an amazing class of AGN for X-ray, optical and multiwavelength science.

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Iyida, Evaristus U., Costecia I. Onah, and Innocent O. Eya. "Statistical Tests of the Relativistic Beaming Indicators of jetted AGNs and Implication for the Revised Blazar Sequence." Nigerian Journal of Physics 33, no. 2 (2024): 75–86. http://dx.doi.org/10.62292/njp.v33i2.2024.222.

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The latest detection by the Fermi Large Area Telescope (Fermi-LAT) of strong relativistic jets of very high-energy (VHE, above 100 GeV) from the Narrow-Line Seyfert 1 Galaxies (NLS1s) has opened a new unified scheme of active galactic nuclei (AGN) in which jetted Seyfert galaxies are viewed as counterparts to a subclass of AGNs. In this paper, we report a systematic investigation of the revised blazar sequence using the γ-ray Doppler factor () and the radio core-dominance parameter (R) of AGN samples of NLS1s and blazar subtypes of flat-spectrum radio quasars (FSRQs) and BL Lac objects (BLs).

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Dan, Feng, Fan Shangchun, and Zheng Dezhi. "A time-varying signal processing method for Coriolis mass flowmeter based on adaptive filter." Transactions of the Institute of Measurement and Control 40, no. 1 (2016): 261–68. http://dx.doi.org/10.1177/0142331216652955.

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In this paper, the normalized least mean square (NLMS) algorithm, a time-varying signal processing method, is employed in a Coriolis mass flowmeter (CFM) to improve its weak anti-jamming capability. Initially, the fundamental principles of the NLMS algorithm adopted in the adaptive filter are analysed. Then, the NLMS algorithm is applied to analyse the signal processing of the CFM at different flow rates in experiments. By comparing several performance indicators and spectrum diagrams from being filtered by the NLMS algorithm and the least mean square (LMS) algorithm, the results indicate that

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Lakićević, M., J. Kovačević-Dojčinović, and L. Č. Popović. "AGN orientation through the spectroscopic correlations and model of dusty cone shell." Monthly Notices of the Royal Astronomical Society 509, no. 1 (2021): 831–43. http://dx.doi.org/10.1093/mnras/stab2926.

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ABSTRACT The differences between Narrow Line Seyfert 1 galaxies (NLS1s) and Broad Line AGNs (BLAGNs) are not completely understood; it is thought that they may have different inclinations and/or physical characteristics. The FWHM(H β)–luminosities correlations are found for NLS1s and their origin is the matter of debate. Here we investigated the spectroscopic parameters and their correlations considering a dusty, cone model of AGN. We apply a simple conical dust distribution (spreading out of broad line region, BLR), assuming that the observed surface of the model is in a good correlation with

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Hunter, Cameron C., Kendra S. Siebert, Damien J. Downes, et al. "Multiple Nuclear Localization Signals Mediate Nuclear Localization of the GATA Transcription Factor AreA." Eukaryotic Cell 13, no. 4 (2014): 527–38. http://dx.doi.org/10.1128/ec.00040-14.

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ABSTRACTTheAspergillus nidulansGATA transcription factor AreA activates transcription of nitrogen metabolic genes in response to nitrogen limitation and is known to accumulate in the nucleus during nitrogen starvation. Sequence analysis of AreA revealed multiple nuclear localization signals (NLSs), five putative classical NLSs conserved in fungal AreA orthologs but not in theSaccharomyces cerevisiaefunctional orthologs Gln3p and Gat1p, and one putative noncanonical RRX33RXR bipartite NLS within the DNA-binding domain. In order to identify the functional NLSs in AreA, we constructedareAmutants

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Zheng, Xiuqing, Zhiwu Liao, Shaoxiang Hu, Ming Li, and Jiliu Zhou. "Improving Spatial Adaptivity of Nonlocal Means in Low-Dosed CT Imaging Using Pointwise Fractal Dimension." Computational and Mathematical Methods in Medicine 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/902143.

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NLMs is a state-of-art image denoising method; however, it sometimes oversmoothes anatomical features in low-dose CT (LDCT) imaging. In this paper, we propose a simple way to improve the spatial adaptivity (SA) of NLMs using pointwise fractal dimension (PWFD). Unlike existing fractal image dimensions that are computed on the whole images or blocks of images, the new PWFD, named pointwise box-counting dimension (PWBCD), is computed for each image pixel. PWBCD uses a fixed size local window centered at the considered image pixel to fit the different local structures of images. Then based on PWBC

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Waddell, S. G. H., and L. C. Gallo. "A Suzaku sample of unabsorbed narrow-line and broad-line Seyfert 1 galaxies – II. Iron emission and absorption." Monthly Notices of the Royal Astronomical Society 510, no. 3 (2022): 4370–78. http://dx.doi.org/10.1093/mnras/stab3695.

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ABSTRACT A sample of 22 narrow-line type 1 Seyfert (NLS1) and 47 broad-line type 1 Seyfert (BLS1) galaxies observed with Suzaku is used to examine the Fe K-band properties of each group. Three different models are used to examine the presence of: narrow neutral Fe K α line at $6.4{\rm \, keV}$ and ionized Fe xxv and Fe xxvi emission lines (model A); a broad emission feature at around $6{-}7{\rm \, keV}$ (model B); and an absorption edge at ${\sim}7.1{\rm \, keV}$ (model C). In all three models, the neutral Fe K α line is weaker (lower luminosity and equivalent width) in NLS1s than in BLS1s. Mo

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Hirst, Paul, Duncan Law-Green, and Martin Ward. "Multiwavelength Properties of Narrow-line Seyfert 1's: Studying One Extreme of the AGN Primary Eigenvector." Symposium - International Astronomical Union 194 (1999): 77–78. http://dx.doi.org/10.1017/s0074180900161765.

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Narrow Line Seyfert 1 galaxies (NLS1s) are an important subclass of radio quiet AGN having extreme optical and X-ray spectroscopic properties. Their relationship to other types of Seyferts remains unclear. NLS1s exhibit many characteristics of Seyfert 1 AGN, but their optical spectra show narrow permitted lines, and some high ionization species. This may result from us viewing them close to ‘pole-on' orientation with respect to an inner torus geometry. We present comparisons of the radio and X-ray properties of NLS1s with those of the 12μm and CfA Seyfert samples.

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Irid, Sidi Mohammed Hadj, Mohammed Hicham Hachemi, Haroun Errachid Adardour, and Mourad Hadjila. "Spectrum Sensing with VSS-NLMS Process in Femto/Macro-cell Environments." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 6 (2018): 5185. http://dx.doi.org/10.11591/ijece.v8i6.pp5185-5194.

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<p>Handover is a process that allows a mobile node to change its attachment point. A mobile node connected to a network can, in order to improve the quality of service, have the need to leave it to connect to a cell either of the same network or of a new network. The present paper introduce three techniques using adaptive Variable Step-Size Least Mean Square (VSSLMS) filter combined with spectrum sensing probability method to detect the triggering of handover in heterogeneous LTE networks. These techniques are Normalized LMS (NLMS), Kwong-NLMS and Li-NLMS. The simulation environment is c

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Jiang, Jiachen, Luigi C. Gallo, Andrew C. Fabian, Michael L. Parker, and Christopher S. Reynolds. "A disc reflection model for ultra-soft narrow-line Seyfert 1 galaxies." Monthly Notices of the Royal Astronomical Society 498, no. 3 (2020): 3888–901. http://dx.doi.org/10.1093/mnras/staa2625.

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ABSTRACT We present a detailed analysis of the XMM–Newton observations of five narrow-line Seyfert 1 galaxies (NLS1s). They all show very soft continuum emission in the X-ray band with a photon index of Γ ≳ 2.5. Therefore, they are referred to as ‘ultra-soft’ NLS1s in this paper. By modelling their optical/UV–X-ray spectral energy distribution (SED) with a reflection-based model, we find indications that the disc surface in these ultra-soft NLS1s is in a higher ionization state than other typical Seyfert 1 AGN. Our best-fitting SED models suggest that these five ultra-soft NLS1s have an Edding

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Richards, J. L., M. L. Lister, T. Savolainen, et al. "The parsec-scale structure, kinematics, and polarization of radio-loud narrow-line Seyfert 1 galaxies." Proceedings of the International Astronomical Union 10, S313 (2014): 139–42. http://dx.doi.org/10.1017/s1743921315002070.

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AbstractSeveral narrow-line Seyfert 1 galaxies (NLS1s) have now been detected in gamma rays, providing firm evidence that at least some of this class of active galactic nuclei (AGN) produce relativistic jets. The presence of jets in NLS1s is surprising, as these sources are typified by comparatively small black hole masses and near- or super-Eddington accretion rates. This challenges the current understanding of the conditions necessary for jet production. Comparing the properties of the jets in NLS1s with those in more familiar jetted systems is thus essential to improve jet production models

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Moran, Edward C. "Radio properties of NLS1s." New Astronomy Reviews 44, no. 7-9 (2000): 527–29. http://dx.doi.org/10.1016/s1387-6473(00)00092-0.

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Karkee, Rajendra, Minani Gurung, Lisasha Poudel, et al. "Health Problems of Nepalese Labor Migrants." WHO South-East Asia Journal of Public Health 11, no. 2 (2022): 128–34. http://dx.doi.org/10.4103/who-seajph.who-seajph_227_21.

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Labor migrants (LMs) often work in precarious work environments and are exposed to various health risks. There is a lack of information on the health of international Nepalese LMs (NLMs). This scoping study was conducted to assess the health problems of international NLMs based on the six-stage scoping review process of Arksey and O'Malley. A literature review and stakeholders consultation related to NLMs' health information were conducted. A total of 455 studies were identified of which 38 studies were potentially relevant based on title and/or abstract screening, and a total of 16 studies we

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Chen, S., M. Berton, G. La Mura, et al. "Probing narrow-line Seyfert 1 galaxies in the southern hemisphere." Astronomy & Astrophysics 615 (July 2018): A167. http://dx.doi.org/10.1051/0004-6361/201832678.

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We present a new accurate catalog of narrow-line Seyfert 1 galaxies (NLS1s) in the southern hemisphere from the Six-degree Field Galaxy Survey (6dFGS) final data release, which is currently the most extensive spectroscopic survey available in the southern sky whose database has not yet been systematically explored. We classified 167 sources as NLS1s based on their optical spectral properties. We derived flux-calibrated spectra for the first time that the 6dFGS does not provide. By analyzing these spectra, we obtained strong correlations between the monochromatic luminosity at 5100 Å and the lu

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Wu, Y. Z., and S. N. Zhang. "The Evolution Sequence in Narrow-Line and Broad-Line SEYFERT 1 Galaxies." Proceedings of the International Astronomical Union 8, S290 (2012): 343–44. http://dx.doi.org/10.1017/s1743921312020327.

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AbstractCollecting a sample of 50 narrow-line Seyfert 1 galaxies (NLS1s) and 44 broad-line Seyfert 1 galaxies (BLS1s), we show that the theoretical maximum starburst line derived by Kewley et al. can separate well BLS1s from NSL1s on the BPT diagrams, and the [N II]λ 6584/Hα ratio increases along the list from NLS1s to BLS1s. We suggest that: (1) they have a sequence from low metallicities to high metallicities between NLS1s and BLS1s; (2) with regard to the “star-froming sequence” of Kewley et al. who noted that it forms a tight sequence from low metallicities to high metallicities, the seque

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Berton, M., V. Braito, S. Mathur, et al. "Broadband X-ray observations of four gamma-ray narrow-line Seyfert 1 galaxies." Astronomy & Astrophysics 632 (December 2019): A120. http://dx.doi.org/10.1051/0004-6361/201935929.

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Narrow-line Seyfert 1 galaxies (NLS1s) is one of the few classes of active galactic nuclei harboring powerful relativistic jets and detected in γ-rays. NLS1s are well-known X-ray sources. While in non-jetted sources the origin of this X-ray emission may be a hot corona surrounding the accretion disk, in jetted objects, especially beamed ones, the contribution of corona and relativistic jet is difficult to disentangle without a proper sampling of the hard X-ray emission. For this reason, we observed with NuSTAR the first four NLS1s detected at high energy γ-rays. These data, along with XMM-Newt

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Wei, Dandan, and Qing Xu. "Selective Partial Update Adaptive Filtering Algorithms for Block-Sparse System Identification." Security and Communication Networks 2022 (April 29, 2022): 1–7. http://dx.doi.org/10.1155/2022/2207115.

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The block-sparse normalized least mean square (BS-NLMS) algorithm which takes advantage of sparsity, successfully shows fast convergence in adaptive block-sparse system identification, adaptive control, and other industrial informatics applications. It is also attractive in acoustic processing where long impulse response, highly correlated and sparse echo path are encountered. However, the major drawback of BS-NLMS is largely computational complexity. This paper proposes a novel selective partial-update block-sparse normalized least mean square (SPU-BS-NLMS) algorithm. Compared with convention

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Wang, Ziyi, Yun Jing Zhang, Qian-yi Zhang, et al. "Sequence specificity of an essential nuclear localization sequence in Mcm3." PLOS Genetics 21, no. 1 (2025): e1011499. https://doi.org/10.1371/journal.pgen.1011499.

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Proteins with nuclear localization sequences (NLSs) are directed into the cell nucleus through interactions between the NLS and importin proteins. NLSs are generally short motifs rich in basic amino acids; however, identifying NLSs can be challenging due to the lack of a universally conserved sequence. In this study, we characterized the sequence specificity of an essential and conserved NLS in Mcm3, a subunit of the replicative DNA helicase. Through mutagenesis and AlphaFold 3 (AF3) modeling, we demonstrate that the precise positioning of basic residues within the NLS is critical for nuclear

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Dai, Jing, Guo Lin Zhang, and Kun Zhao. "The FPGA Implementation of NLMS Adaptive Interference Cancellation Algorithm." Applied Mechanics and Materials 128-129 (October 2011): 1105–8. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.1105.

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A adaptive interference cancellation algorithm was proposed in this paper，which was based on NLMS algorithm.The NLMS algorithm was achieved on FPGA chips. This paper described the method of the specific implementation. This method introduces bit-shift in terms of subsection instead of division operation, by which the operation speed of FPGA is improved apparently.By Matlab simulating the functions, and analyzing the PSD curve and the constellation of output signals, the adaptive interference cancellation algorithm system based on NLMS achieved expected effect. The better in-band flatness of th

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Gui, Guan, Zhang-xin Chen, Li Xu, Qun Wan, Jiyan Huang, and Fumiyuki Adachi. "Variable Is Better Than Invariable: Sparse VSS-NLMS Algorithms with Application to Adaptive MIMO Channel Estimation." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/274897.

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Channel estimation problem is one of the key technical issues in sparse frequency-selective fading multiple-input multiple-output (MIMO) communication systems using orthogonal frequency division multiplexing (OFDM) scheme. To estimate sparse MIMO channels, sparseinvariable step-size normalized least mean square(ISS-NLMS) algorithms were applied to adaptive sparse channel estimation (ACSE). It is well known that step-size is a critical parameter which controls three aspects: algorithm stability, estimation performance, and computational cost. However, traditional methods are vulnerable to cause

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Sbarrato, Tullia, Massimo Dotti, Giancarlo Ghirlanda, and Fabrizio Tavecchio. "Study of the orientation of narrow-line Seyfert I." Astronomy & Astrophysics 616 (August 2018): A43. http://dx.doi.org/10.1051/0004-6361/201732451.

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We study a sample of narrow-line Seyfert 1 galaxies (NLS1) in their optical and radio features to understand the differences between their radio silent, radio-loud, and radio-quiet subclasses. We first show that the different redshift and mass distributions of radio-loud and radio-quiet NLS1s could be ascribed to observational biases. We then present a geometrical model according to which most of the different observational features of radio-loud and radio-quiet NLS1s are ascribed to the orientation of an intrinsically structured jet. We estimate the fraction of intrinsically jetted sources am

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Berton, Marco. "AGN evolution as seen in spectral lines: The case of narrow-line Seyfert 1s." Proceedings of the International Astronomical Union 15, S356 (2019): 94. http://dx.doi.org/10.1017/s1743921320002653.

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AbstractLine profiles can provide fundamental information on the physics of active galactic nuclei (AGN). In the case of narrow-line Seyfert 1 galaxies (NLS1s) this is of particular importance since past studies revealed how their permitted line profiles are well reproduced by a Lorentzian function instead of a Gaussian. This has been explained with different properties of the broad-line region (BLR), which may present more pronounced turbulent motions in NLS1s with respect to other AGN. We investigated the line profiles in a recent large NLS1 sample classified using SDSS, and we divided the s

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Li, Ying, and Dong-Zi Pan. "Barrier Longevity of NaCl-Laden Soil against Subterranean Termites in an Earth Embankment." Sustainability 13, no. 23 (2021): 13360. http://dx.doi.org/10.3390/su132313360.

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Subterranean termite-induced damage to earth embankments in agricultural systems occurs globally. NaCl-laden soil barriers (NLSBs) are an environmentally sustainable termite control method, and have exhibited good potential in preventing termite-related tunneling damage in Zhejiang Province, China. The persistence of the NaCl concentration in NLSBs is a key characteristic for the long-term prevention of subterranean termite infestations. This study is a scientific attempt to estimate the field efficacy and barrier longevity of NLSBs in reservoir embankments based on the Richards equation and t

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Yuan, Weimin, Zhu Liu, Youjun Lu та Xin-Lin Zhou. "Relativistic Fe Kα line and ensemble spins of black holes in narrow-line Seyfert 1 galaxies". Proceedings of the International Astronomical Union 10, S312 (2014): 39–42. http://dx.doi.org/10.1017/s1743921315007437.

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AbstractWhile a broad line of the Fe Kα emission is commonly found in the X-ray spectra of typical Seyfert galaxies, the situation is unclear in the case of Narrow Line Seyfert 1 galaxies (NLS1s)—an extreme subset which are generally thought to harbor less massive black holes with higher accretion rates. We report results of our study of the assemble property of the Fe K line in NLS1s by stacking the X-ray spectra of a large sample of 51 NLS1s observed with XMM-Newton. We find in the stacked X-ray spectra a prominent, broad emission feature over 4–7 keV, which is characteristic of the broad Fe

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Okoekhian, Joshua, Mathurine Guiawa, and Ikenna Onyegbadue. "Design and Simulation of Adaptive Filters in Real-Time Environment." International Journal of Research and Review 11, no. 11 (2024): 215–38. http://dx.doi.org/10.52403/ijrr.20241118.

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The results of the study showed that adaptive filters were designed and simulated to enhance signal processing capabilities in real-time environments. The study focused on the LMS and NLMS algorithms for echo and noise cancellation in audio signals, exploring the impact of different mu values (0.01, 0.05, 0.1, and 0.5) on algorithm performance. A comprehensive literature review underscored the importance of effective adaptive filtering techniques in real-time audio processing and highlighted the trade-off between convergence speed and stability. The results indicated that a mu value between 0.

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FOSCHINI, LUIGI. "POWERFUL RELATIVISTIC JETS IN SPIRAL GALAXIES." International Journal of Modern Physics: Conference Series 08 (January 2012): 172–77. http://dx.doi.org/10.1142/s2010194512004564.

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The discovery of high-energy (E > 100 MeV) γ rays from Narrow-Line Seyfert 1 Galaxies (γ-NLS1s) has confirmed the presence of powerful relativistic jets in this class of active galactic nuclei (AGN). Although the jet emission is similar to that of blazars and radio galaxies, γ-NLS1s have some striking differences: relatively small masses (106-8 M⊙), high accretion rates (0.1-1 times the Eddington limit) and are generally hosted by spiral galaxies. It is now possible to study a rather unexplored range of mass and accretion rates of AGN with relativistic jets. Specifically, in this work I pre

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Yoshioka, Gary, Ellinor Coder, Isabelle Morin, Mark Landry, Barbara Davis, and Lynn Beasley. "HARMONIZING REQUIREMENTS FOR OILS, NOXIOUS LIQUID SUBSTANCES, AND HAZARDOUS SUBSTANCES IN SPILL PREPAREDNESS REGULATIONS1." International Oil Spill Conference Proceedings 2005, no. 1 (2005): 101–6. http://dx.doi.org/10.7901/2169-3358-2005-1-101.

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ABSTRACT The U.S. Coast Guard (USCG) enforces regulations for vessel response plans and marine transportation-related facility response plans for oil. The U.S. Environmental Protection Agency (EPA) enforces similar regulations for response plans for non-transportation-related facilities. Proposed USCG rules would require response plans for hazardous substances designated under the authority of the Clean Water Act (CWA). Other USCG regulations implement provisions of the International Convention for the Prevention of Pollution from Ships, known as MARPOL 73/78. Annex I of MARPOL 73/78 addresses

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Wang, Haoxu, Bingjie Li, Ming Liu, et al. "Normalized LMS adaptive filter algorithm: principles and verilog HDL implementation." Journal of Physics: Conference Series 2991, no. 1 (2025): 012021. https://doi.org/10.1088/1742-6596/2991/1/012021.

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Abstract This article offers a detailed exploration of the Normalized Least Mean Squares (NLMS) algorithm, highlighting its enhanced adaptive filtering capabilities and robust performance in managing input signal correlations. It delves into the foundational principles of the NLMS algorithm and outlines the essential modules required for its implementation in Verilog HDL. The implementation and simulation of the NLMS adaptive filter are studied. The simulation outcomes indicate that the convergence rate of the algorithm is superior to that of the conventional LMS algorithm.

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Bendoumia, Redha, Abderrezak Guessoum, Islam Hassani, and Ahcene Abed. "New Low-Complexity Selected Active Coefficients Adaptive Sparse Algorithm for Teleconferencing Systems and Identification." Jordan Journal of Electrical Engineering 11, no. 1 (2025): 1. http://dx.doi.org/10.5455/jjee.204-1713819062.

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Addressing the challenge of sparse acoustic channel is important in communication systems such as tele- and video-conferencing systems. Sparse impulse response plays an efficient role in acoustic identification systems, particularly in long acoustic rooms. This article presents an enhanced version of the Improved Proportionate Normalized Least-Mean-Squares (IP-NLMS) algorithm. It adapts only the active coefficients, thereby reducing the computational complexity of IP-NLMS algorithm. The selected active coefficients of the IP-NLMS algorithm (SAC-IP-NLMS) are proposed exactly in sparse impulse r

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Rakshit, Suvendu, Malte Schramm, C. S. Stalin та ін. "TXS 1206 + 549: a new γ-ray-detected narrow-line Seyfert 1 galaxy at redshift 1.34?" Monthly Notices of the Royal Astronomical Society: Letters 504, № 1 (2021): L22—L27. http://dx.doi.org/10.1093/mnrasl/slab031.

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ABSTRACT Radio and γ-ray loud narrow-line Seyfert 1 galaxies (NLS1s) are unique objects to study the formation and evolution of relativistic jets, as they are believed to have high accretion rates and powered by low mass black holes contrary to that known for blazars. However, only about a dozen γ-ray-detected NLS1s (γ-NLS1s) are known to date and all of them are at $z$ ≤ 1. Here, we report the identification of a new γ-ray-emitting NLS1 TXS 1206 + 549 at $z$ = 1.344. A near-infrared spectrum taken with the SubaruTelescope showed H β emission line with FWHM of 1194 ± 77 km s−1 and weak [O iii]

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Rusu, Alexandru-George, Constantin Paleologu, Jacob Benesty, and Silviu Ciochină. "A Variable Step Size Normalized Least-Mean-Square Algorithm Based on Data Reuse." Algorithms 15, no. 4 (2022): 111. http://dx.doi.org/10.3390/a15040111.

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The principal issue in acoustic echo cancellation (AEC) is to estimate the impulse response between the loudspeaker and microphone of a hands-free communication device. This application can be addressed as a system identification problem, which can be solved by using an adaptive filter. The most common one for AEC is the normalized least-mean-square (NLMS) algorithm. It is known that the overall performance of this algorithm is controlled by the value of its normalized step size parameter. In order to obtain a proper compromise between the main performance criteria (e.g., convergence rate/trac

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Chen, Xiaojuan, Haoyu Yu, Jingyao Xu та Funan Gao. "An SNR Enhancement Method for Φ-OTDR Vibration Signals Based on the PCA-VSS-NLMS Algorithm". Sensors 24, № 13 (2024): 4340. http://dx.doi.org/10.3390/s24134340.

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To improve the signal-to-noise ratio (SNR) of vibration signals in a phase-sensitive optical time-domain reflectometer (Φ-OTDR) system, a principal component analysis variable step-size normalized least mean square (PCA-VSS-NLMS) denoising method was proposed in this study. First, the mathematical principle of the PCA-VSS-NLMS algorithm was constructed. This algorithm can adjust the input signal to achieve the best filter effect. Second, the effectiveness of the algorithm was verified via simulation, and the simulation results show that compared with the wavelet denoising (WD), Wiener filterin

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Aali, Seyed Reza, Mohammad Reza Besmi, and Mohammad Hosein Kazemi. "Smart VRP-NLMS algorithm for estimation of power system frequency." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 1 (2019): 362–81. http://dx.doi.org/10.1108/compel-06-2018-0263.

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Purpose The purpose of this paper is to study variation regularization with a positive sequence extraction-normalized least mean square (VRP-NLMS) algorithm for frequency estimation in a three-phase electrical distribution system. A simulation test is provided to validate the performance and convergence rate of the proposed estimation algorithm. Design/methodology/approach Least mean square (LMS) algorithms for frequency estimation encounter problems when voltage contains unbalance, sags and harmonic distortion. The convergence rate of the LMS algorithm is sensitive to the adjustment of the st

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Melnikov, Sergey, Hui-Si Kwok, Kasidet Manakongtreecheep, Antonia van den Elzen, Carson C. Thoreen, and Dieter Söll. "Archaeal Ribosomal Proteins Possess Nuclear Localization Signal-Type Motifs: Implications for the Origin of the Cell Nucleus." Molecular Biology and Evolution 37, no. 1 (2019): 124–33. http://dx.doi.org/10.1093/molbev/msz207.

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Abstract Eukaryotic cells are divided into the nucleus and the cytosol, and, to enter the nucleus, proteins typically possess short signal sequences, known as nuclear localization signals (NLSs). Although NLSs have long been considered as features unique to eukaryotic proteins, we show here that similar or identical protein segments are present in ribosomal proteins from the Archaea. Specifically, the ribosomal proteins uL3, uL15, uL18, and uS12 possess NLS-type motifs that are conserved across all major branches of the Archaea, including the most ancient groups Microarchaeota and Diapherotrit

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