2,278 research outputs found
Spin-torque oscillator linewidth narrowing under current modulation
No full textWe study the behavior of the linewidth of a nanocontact based spin torque oscillator (STO) under application of a radio frequency (100 MHz) modulating current. We achieve a significant (up to 85% ) reduction in the STO linewidth when it is modulated across a region of high nonlinearity. The mechanism responsible for the linewidth reduction is the nonlinear frequency shift under the influence of current modulation, which reduces the nonlinear amplification of the linewidth. The reduction in the linewidth during modulation can be quantitatively calculated from the free-running behavior of the STO. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3588038
Nonlinear frequency and amplitude modulation of a nanocontact-based spin-torque oscillator
No full textWe study the current-controlled modulation of a nanocontact spin-torque oscillator. Three principally different cases of frequency nonlinearity (d(2)f/dI(dc)(2) being zero, positive, and negative) are investigated. Standard nonlinear frequency-modulation theory is able to accurately describe the frequency shifts during modulation. However, the power of the modulated sidebands only agrees with calculations based on a recent theory of combined nonlinear frequency and amplitude modulation
Frequency modulation of spin torque oscillator pairs
No full textThe current controlled modulation of nanocontact based spin torque oscillator (STO) pairs is studied in both the synchronized and nonsynchronized states. The synchronized state shows a well behaved modulation and demonstrates robust mutual locking even under strong modulation. The power distribution of the modulation sidebands can be quantitatively described by assuming a single oscillator model. However, in the nonsynchronized state, the modulation sidebands are not well described by the model, indicating interactions between the two individual nanocontact STOs. These findings are promising for potential applications requiring the modulation of large synchronized STO arrays. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3588218
Spin Torque-Generated Magnetic Droplet Solitons
No full textDissipative solitons have been reported in a wide range of nonlinear systems, but the observation of their magnetic analog has been experimentally challenging. Using spin transfer torque underneath a nanocontact on a magnetic thin film with perpendicular magnetic anisotropy (PMA), we have observed the generation of dissipative magnetic droplet solitons and report on their rich dynamical properties. Micromagnetic simulations identify a wide range of automodulation frequencies, including droplet oscillatory motion, droplet "spinning," and droplet "breather" states. The droplet can be controlled by using both current and magnetic fields and is expected to have applications in spintronics, magnonics, and PMA-based domain-wall devices
Computing many faces in arrangements of lines and segments
No full textWe present randomized algorithms for computing many faces in an arrangement of lines or of segments in the plane, which are considerably simpler and slightly faster than the previously known ones. pn The main new idea is a simple randomized O(n log n) expected time algorithm for computing root n cells in an arrangement of n lines.A part of this work was done while the first and third authors were visiting Charles University and while the first author was visiting Utrecht University. The first author has been supported by National Science Foundation Grant CCR-93-01259 and an NYI aword. The second author has been supported by Charles University grant No. 351 and Czech Republic Grant GACR 201/93/2167. The third author has been supported by the Netherlands' Organization for Scientific Research (NWO) and partially supported by ESPRIT Basic Research Action No. 7141 (project ALCOM 2:Algorithms and Complexity)
Search for CP violation using triple product asymmetries in Λ b 0 → pK−π+π−, Λ b 0 → pK−K+K− and Ξ b 0 → pK−K−π+ decays
No full text© 2018, The Author(s). A search for CP and P violation using triple-product asymmetries is performed with Λb0 → pK−π+π−, Λb0 → pK−K+K− and Ξb0 → pK−K−π+ decays. The data sample corresponds to integrated luminosities of 1.0 fb−1 and 2.0 fb−1, recorded with the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV, respectively. The CP - and P - violating asymmetries are measured both integrating over all phase space and in specific phase-space regions. No significant deviation from CP or P symmetry is found. The first observation of Λb0 → pK−χc0(1P)(→π+π−, K+K−) decay is also reported
Test of lepton universality with Λb0→ pK-ℓ+ℓ- decays
No full text© 2020, The Author(s). The ratio of branching fractions of the decays Λb0 → pK−e+e− and Λb0 → pK−μ+μ−,RpK−1, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2< 6.0 GeV2/c4 and the pK− mass range m(pK−) < 2600 MeV/c2, the ratio of branching fractions is measured to be RpK−1=1.17−0.16+0.18±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λb0 → pK−e+e−. [Figure not available: see fulltext.]
Test of lepton universality with Λb0→ pK-ℓ+ℓ- decays
No full text© 2020, The Author(s). The ratio of branching fractions of the decays Λb0 → pK−e+e− and Λb0 → pK−μ+μ−,RpK−1, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2< 6.0 GeV2/c4 and the pK− mass range m(pK−) < 2600 MeV/c2, the ratio of branching fractions is measured to be RpK−1=1.17−0.16+0.18±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λb0 → pK−e+e−. [Figure not available: see fulltext.]
NALURI KEMASYARAKATAN DALAM PENCIPTAAN KUMPULAN CERPEN SONG OF SEPTEMBER KARYA MALIM GHOZALI PK.
No full textPengarang kreatif, Malim Ghozali Pk terkenal dalam genre cerpen dan novel yang kebanyakan ideanya terhasil semasa mengembara di luar negara. Sumbangannya diiktiraf hingga pernah menerima Anugerah SEA Write Award dari kerajaan Thailand. Bagaimanapun, karya kreatif Malim Ghozali Pk tidak diberi perhatian oleh mana-mana pengkaji untuk dianalisis secara ilmiah. Justeru, situasi ini menjadi permasalahan yang mendorong kepada kajian ini dibuat dan menggunakan Teori Sastera Perjalanan atau Pengembaraan dan Model Proses Kreatif Teksnaluri. Kajian ini bertujuan mengkaji naluri kemasyarakatan disebabkan pengembaraan yang mendorong pengarang Malim Ghozali PK menghasilkan cerpen dalam Kumpulan Cerpen Songs of September. Kumpulan cerpen ini mengandungi 20 buah cerpen, namun hanya enam sahaja cerpen dianalisis. Kajian ini menggunakan kaedah kualitatif, iaitu kajian kepustakaan dan analisis teks melalui Teori Sastera Perjalanan atau Pengembaraan dan naluri kemasyarakatan berdasarkan Model Proses Kreatif Teksnaluri. Hasil dapatan kajian menunjukkan bahawa Malim Ghozali Pk adalah seorang pengarang kreatif yang memaparkan naluri kemasyarakatan dalam menghasilkan cerpen melalui pengalaman yang diperolehnya ketika melakukan pengembaraan. Cerpen yang bertajuk “Aku diSini, Sayang”, “ꓕ!”, “Tika Hujan di Bogor”, “Di Kantor Suryadi”, “Nyet” dan “Song Of September” menjadi fokus utama pengkaji untuk mencungkil naluri kemasyarakatan pengarang Malim Ghozali PK. Secara keseluruhannya, boleh dikatakan bahawa cerpen Malim Ghozali PK ini mencerminkan kehidupan yang pernah dilalui ketika pengarang melakukan pengembaraan di luar negara.
The creative author, Malim Ghozali Pk which is well known in genre of short stories and novels created during his journey to other countries. The contribution has been recognized as he received the SEA Write Award from the government of Thailand. However, the creative writing of Malim Ghozali Pk are not catching any attention to any researcher for academic purpose. Thus, this situation become a problems that driven to the author Malim Ghozali PK to create a short stories in "Songs of September". These short stories contained 20 short stories, however there are only six has been analyzed. This research will use the qualitative type of method, which is the library research and analyzing texts through the Theory Journey or Adventure of Literature and society instinct based on the Model of Process Creative Instinctive Text. The findings of this study indicates that Malim Ghozali Pk is the creative author that shows his society instinct in creating the short stories based on his past experience that he gain during his journey. The short story entitled "Aku di Sini Sayang", ''Tika Hujan di Bogor'', Di Kantor Suryadi”, “Nyet” dan “Song Of September” become the main focus for the researcher to find the society instinct in Malim Ghozali Pk himself. All in all, it can be said that the short stories of Malim Ghozali PK reflecting his life during the journey to other countries. 
Amplitude analysis of the Λb0→pK−γ decay
No full textThe resonant structure of the radiative decay Λb0→pK−γ in the region of proton-kaon invariant-mass up to 2.5 GeV/c2 is studied using proton-proton collision data recorded at centre-of-mass energies of 7, 8, and 13 TeV collected with the LHCb detector, corresponding to a total integrated luminosity of 9 fb−1. Results are given in terms of fit and interference fractions between the different components contributing to this final state. Only Λ resonances decaying to pK− are found to be relevant, where the largest contributions stem from the Λ(1520), Λ(1600), Λ(1800), and Λ(1890) states. © The Author(s) 2024
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