Two Circular-Rotational Eigenmodes in Vortex Gyrotropic Motions in Soft Magnetic Nanodots

We found, by micromagnetic numerical and analytical calculations, that the clockwise (CW) and counterclockwise (CCW) circular-rotational motions of a magnetic vortex core in a soft magnetic circular nanodot are the elementary eigenmodes existing in the gyrotropic motion with respect to the corresponding CW and CCW circular-rotational-field eigenbasis. Any steady-state vortex gyrotropic motions driven by a linearly polarized oscillating in-plane magnetic field in the linear regime can be perfectly understood according to the superposition of the two circular eigenmodes, which show asymmetric resonance characteristics reflecting the vortex polarization. The relative magnitudes in the amplitude and phase between the CCW and CW eigenmodes determine the elongation and orientation of the orbital trajectories of the vortex core motions, respectively, which trajectories vary with the polarization and chirality of the given vortex as well as the field frequency across the resonance frequency.Comment: 30 pages, 7 figure

Atomic ion clock with two ion traps, and method to transfer ions

An atomic ion clock with a first ion trap and a second ion trap, where the second ion trap is of higher order than the first ion trap. In one embodiment, ions may be shuttled back and forth from one ion trap to the other by application of voltage ramps to the electrodes in the ion traps, where microwave interrogation takes place when the ions are in the second ion trap, and fluorescence is induced and measured when the ions are in the first ion trap. In one embodiment, the RF voltages applied to the second ion trap to contain the ions are at a higher frequency than that applied to the first ion trap. Other embodiments are described and claimed

Perbandingan Pendapatan USAhatani Padimenggunakan Sistem Tanam Jajar Legowo Dengan Sistem Tanam Sri ( System of Rice Intensification) ( Studi Kasus Di Subak Giri Desa Bungbungan, Kecamatan Banjarangkan Kabupaten Klungkung)

This study aims to: (1) Funding and acceptance rice farming which uses the system of planting Jajar Legowo with SRI planting system; (2) Analyze the rice farming income ratio that uses Jajar Legowo planting system with SRI planting system; and (3) Constraints faced by farmers in the village of the District Bungbungan Banjarangkan, Klungkung in implementing or managing rice farming which uses Jajar Legowo planting system with SRI planting system. Determination of the respondents using Proportional Random Sampling method is 15% taken from each population that is 30 respondents to Legowo row planting system and 30 den response to SRI method of planting. The results showed that farm income using Legowo row planting system is Rp.17.032.100 / 1 hectare / season planting and cropping system SRI is 17.0911.000 / 1 hectare / growing season. T-test results showed that Legowo row planting system is not significantly different from rice farming income using SRI planting system. Based on the findings in this study it is suggested that the government's role as supervisor of the field is further enhanced by providing instructor-educator on how to combat pests and method of application of the system of rice farming in order to obtain maximum results and to improve the income of rice farming is advisable to minimize the obstacles encountered farmers with the provision of the means of production through the development of cooperatives and provide more intensive counseling especially on pests and diseases

The Star Formation History of LGS 3

We have determined the distance and star formation history of the Local Group dwarf galaxy LGS 3 from deep Hubble Space Telescope WFPC2 observations. LGS 3 is intriguing because ground-based observations showed that, while its stellar population is dominated by old, metal-poor stars, there is a handful of young, blue stars. Also, the presence of HI gas makes this a possible ``transition object'' between dwarf spheroidal and dwarf irregular galaxies. The HST data are deep enough to detect the horizontal branch and young main sequence for the first time. A new distance of D=620+/-20 kpc has been measured from the positions of the TRGB, the red clump, and the horizontal branch. The mean metallicity of the stars older than 8 Gyr is Fe/H = -1.5 +/- 0.3. The most recent generation of stars has Fe/H ~ -1. For the first few Gyr the global star formation rate was several times higher than the historical average and has been fairly constant since then. However, we do see significant changes in stellar populations and star formation history with radial position in the galaxy. Most of the young stars are found in the central 63 pc (21''), where the star formation rate has been relatively constant, while the outer parts have had a declining star formation rate.Comment: To appear in The Astrophysical Journal, 26 pages, 14 figures, uses AASTe

Development of Navigation Control Algorithm for AGV Using D* Search Algorithm

In this paper, we present a navigation control algorithm for Automatic Guided Vehicles (AGV) that move in industrial environments including static and moving obstacles using D* algorithm. This algorithm has ability to get paths planning in unknown, partially known and changing environments efficiently. To apply the D* search algorithm, the grid map represent the known environment is generated. By using the laser scanner LMS-151 and laser navigation sensor NAV-200, the grid map is updated according to the changing of environment and obstacles. When the AGV finds some new map information such as new unknown obstacles, it adds the information to its map and re-plans a new shortest path from its current coordinates to the given goal coordinates. It repeats the process until it reaches the goal coordinates. This algorithm is verified through simulation and experiment. The simulation and experimental results show that the algorithm can be used to move the AGV successfully to reach the goal position while it avoids unknown moving and static obstacles. [Keywords— navigation control algorithm; Automatic Guided Vehicles (AGV); D* search algorithm

Physical Properties of Tidal Features in Interacting Disk Galaxies

We explore tidal interactions of a galactic disk with Toomre parameter Q ~ 2 embedded in rigid halo/bulge with a point mass companion moving in a prescribed parabolic orbit. Tidal interactions produce well-defined spiral arms and extended tidal features such as bridge and tail that are all transient, but distinct in nature. In the extended disks, strong tidal force is able to lock the perturbed epicycle phases of the near-side particles to the perturber, shaping them into a tidal bridge that corotates with the perturber. A tidal tail develops at the opposite side as strongly-perturbed, near-side particles overtake mildly-perturbed, far-side particles. The tail is essentially a narrow material arm with a roughly logarithmic shape, dissolving with time because of large velocity dispersions. Inside the disks where tidal force is relatively weak, on the other hand, a two-armed logarithmic spiral pattern emerges due to the kinematic alignment of perturbed particle orbits. While self-gravity makes the spiral arms a bit stronger, the arms never become fully self-gravitating, wind up progressively with time, and decay after the peak almost exponentially in a time scale of ~ 1 Gyr. The arm pattern speed varying with both radius and time converges to Omega-kappa/2 at late time, suggesting that the pattern speed of tidally-driven arms may depend on radius in real galaxies. We present the parametric dependences of various properties of tidal features on the tidal strength, and discuss our findings in application to tidal spiral arms in grand-design spiral galaxies. (Abridged)Comment: 49 pages, 17 figures, 1 table. Accepted for publication in Astrophysical Journal. PDF version with higher resolution figures is available at http://astro.snu.ac.kr/~shoh/research/publications/astroph/Tidally_Induced_Spiral_Structure.pd

Experimental ionization of atomic hydrogen with few-cycle pulses

We present the first experimental data on strong-field ionization of atomic hydrogen by few-cycle laser pulses. We obtain quantitative agreement at the 10% level between the data and an {\it ab initio} simulation over a wide range of laser intensities and electron energies

Variational perturbation approach to the Coulomb electron gas

The efficiency of the variational perturbation theory [Phys. Rev. C {\bf 62}, 045503 (2000)] formulated recently for many-particle systems is examined by calculating the ground state correlation energy of the 3D electron gas with the Coulomb interaction. The perturbation beyond a variational result can be carried out systematically by the modified Wick's theorem which defines a contraction rule about the renormalized perturbation. Utilizing the theorem, variational ring diagrams of the electron gas are summed up. As a result, the correlation energy is found to be much closer to the result of the Green's function Monte Carlo calculation than that of the conventional ring approximation is.Comment: 4 pages, 3 figure

Asosiasi Pengetahuan Tentang Demam Berdarah dan Upaya Pemberantasan Sarang Nyamuk di Kelurahan Sesetan, Denpasar Selatan, Bali.

Penyakit Demam Berdarah Dengue (DBD) merupakan salah satu permasalahan kesehatanmasyarakat yang serius di Indonesia, termasuk di kota Denpasar, Bali. Pengetahuan terhadapdemam berdarah merupakan salah satu faktor yang sangat mempengaruhi perilaku pencegahandemam berdarah.Penelitian ini bertujuan untuk mengetahui apakah terdapat asosiasi antara pengetahuan danperilaku masyarakat dalam upaya pemberantasan sarang nyamuk (PSN) di kelurahan Sesetan,kecamatan Denpasar Selatan. Penelitian ini merupakan salah satu bagian dari hasil penelitiantentang kajian perilaku sosial budaya masyarakat dalam pemberantasan sarang nyamuk yangdilaksanakan pada tahun 2011 di kelurahan Sesetan.Metode kuantitatif dan design cross sectional digunakan dalam penelitian ini. Pengumpulandata dilaksanakan selama bulan Januari sampai dengan Maret tahun 2011 di kelurahan Sesetan.Jumlah sampel sebanyak 125 responden yang dipilih dengan menggunakan teknik probabilityproportional to size (PPS). Analisis data bivariate dilakukan dengan chi square untuk mengetahuiapakah terdapat asosiasi antara pengetahuan tentang DBD dan perilaku PSN.Hasil penelitian menunjukkan bahwa 20,6% responden dengan tingkat pengetahuan kurang dan79,2% dengan tingkat pengetahuan kurang.Demam (95,2%) dan bintik merah (56%) merupakanciri ciri penyakit demam berdarah yang paling banyak diketahui responden. Kategori perilakuPSN baik dimiliki 21,6% responden dan kurang baik 78,4% responden.Analisis data dengan ch

Precise and accurate measurements of strong-field photoionisation and a transferrable laser intensity calibration standard

Ionization of atoms and molecules in strong laser fields is a fundamental process in many fields of research, especially in the emerging field of attosecond science. So far, demonstrably accurate data have only been acquired for atomic hydrogen (H), a species that is accessible to few investigators. Here we present measurements of the ionization yield for argon, krypton, and xenon with percentlevel accuracy, calibrated using H, in a laser regime widely used in attosecond science. We derive a transferrable calibration standard for laser peak intensity, accurate to 1.3%, that is based on a simple reference curve. In addition, our measurements provide a much-needed benchmark for testing models of ionisation in noble-gas atoms, such as the widely employed single-active electron approximation.Comment: Article: 5 pages, 2 figures, submitted to PRL (manuscript number LZ14457). Supplementary information: 7 pages, 6 figures, appended to end of main Articl