Inherent Structures in m-component Spin Glasses

We observe numerically the properties of the infinite-temperature inherent structures of m-component vector spin glasses in three dimensions. An increase of m implies a decrease of the amount of minima of the free energy, down to the trivial presence of a unique minimum. For little m correlations are small and the dynamics are quickly arrested, while for larger m low-temperature correlations crop up and the convergence is slower, to a limit that appears to be related with the system size.Comment: Version accepted in Phys. Rev. B, 10 pages, 11 figure

Collective Dynamics and Strong Pinning near the Onset of Charge Order in La1.48_{1.48}Nd0.4_{0.4}Sr0.12_{0.12}CuO4_{4}

The dynamics of charge-ordered states is one of the key issues in underdoped cuprate high-temperature superconductors, but static short-range charge-order (CO) domains have been detected in almost all cuprates. We probe the dynamics across the CO (and structural) transition in La$_{1.48}$Nd$_{0.4}$Sr$_{0.12}$CuO$_{4}$ by measuring nonequilibrium charge transport, or resistance $R$ as the system responds to a change in temperature and to an applied magnetic field. We find evidence for metastable states, collective behavior, and criticality. The collective dynamics in the critical regime indicates strong pinning by disorder. Surprisingly, nonequilibrium effects, such as avalanches in $R$, are revealed only when the critical region is approached from the charge-ordered phase. Our results on La$_{1.48}$Nd$_{0.4}$Sr$_{0.12}$CuO$_{4}$ provide the long-sought evidence for the fluctuating order across the CO transition, and also set important constraints on theories of dynamic stripes.Comment: final version: 5 pages, 3 figures; includes Supplemental Material (3 pages, 7 figures

KASALAHAN MORFOLOGIS DINA TÉKS BIANTARA SISWA KELAS IX SMP PASUNDAN 4 BANDUNG TAUN AJARAN 2014/2015

Penelitian ini dilatarbelakangi oleh adanya kesalahan morfologis yang dilakukan oleh siswa kelas IX SMP Pasundan 4 Bandung tahun ajaran 2014/2015 dalam menulis teks pidato. Terutama kesalahan dalam menggunakan afiks, kata ulang dan kata majemuk. Oleh karena itu, diadakan penelitian yang bertujuan untuk menganalisis dan mendeskripsikan kesalahan morfologis dalam teks pidato siswa kelas IX SMP Pasundan 4 Bandung tahun ajaran 2014/2015. Metode yang digunakan dalam penelitian ini yaitu metode deskriptif. Untuk mengumpulkan data, tehnik yang digunakan yaitu tehnik tes dan dokumentasi, sedangkan untuk menganalisis data digunakan tehnik analisis kesalahan berbahasa. Instrumen yang digunakan dalam penelitian ini yaitu soal tes dan kartu data. Data dalam penelitian ini berupa kesalahan morfologis. Sedangkan sumber data dalam penelitian ini adalah karangan téks biantara siswa. Berdasarkan hasil penelitian, dari 107 teks pidato siswa ditemukan 201 kata yang mengalami kesalahan morfologis. Dari 201 kata tersebut, 182 kata (90.55%) merupakan kesalahan dalam menggunakan afiks, 18 kata (8.95%) merupakan kesalahan dalam menggunakan kata ulang, dan satu kata (0.50%) merupakan kesalahan dalam menggunakan kata majemuk. Kesalahan yang terjadi tidak hanya diperoleh dari kesalahan yang murni merupakan kata dari basa Sunda, melainkan kesalahan yang paling banyak terjadi adalah kesalahan pembentukan kata akibat dari adanya interferensi bahasa Indonesia. Dari tiga kesalahan tersebut diurutkan dari yang paling dominan adalah kesalahan dalam pembubuhan afiks, kesalahan menggunakan bentuk kata ulang, dan kesalahan menggunakan kata majemuk. Kesimpulan dari penelitian ini bahwa siswa kelas IX SMP Pasundan 4 Bandung masih banyak (90.55%) melakukan kesalahan dalam menggunakan kaidah morfologis. This research was triggered by the presence of morphological errors made by the ninth grade students of SMP Pasundan 4 Bandung academic year 2014/2015 while writing speech text. Therefore, this research was conducted with the intention to analyze and describe the morphological errors in the student speech text of class IX SMP Pasundan 4 Bandung academic year 2014/2015. The method used in this research is descriptive method. To collect the data, the test and documentation technique was used, while to analyze the data the researcher uses language error analysis techniques. The instrument used in this research are the written test and data card. Data in this research is the words that have a morphological errors in speech text written by the ninth grade students of SMP Pasundan 4 Bandung academic year 2014/2015. Data’s source in this research is speech text written by the students class IX-A, IX-C and IX-D of SMP Pasundan 4 Bandung academic year 2014/2015. Based on the result of the analysis, from 107 of the speech texts written by the students the researcher found 201 sentences encounter morphological error. From those 201 sentences 182 words (90.55%) were the misuses of affix, 18 words (8.95%) were the misuses of re-form word, and a word (0.50%) was the misuse of compound word. The errors that occur are not only the pure error of the basic sundanese word, but also in the formation of words, as a result of the interference of Bahasa Indonesia. The conclusion of this research is that the students of class IX SMP Pasundan 4 Bandung are still encouter a lot (90.55%) of mistakes in using proper morphological rules

Current-voltage characteristics and vortex dynamics in highly underdoped La2−x_{2-x}Srx_{x}CuO4_{4}

The temperature dependence of the nonlinear current-voltage ($I$-$V$) characteristics in highly underdoped La$_{2-x}$Sr$_{x}$CuO$_{4}$ ($x=0.07$ and 0.08) thick films has been studied in both zero and perpendicular magnetic fields $H$. Power-law behavior of $V(I)$ is found for both $H=0$ and $H \neq 0$. The critical current $I_{c}$ was extracted, and its temperature and magnetic field dependences were studied in detail. The Berezinskii-Kosterlitz-Thouless physics dominates the nonlinear $I$-$V$ near the superconducting transition at $H=0$, and it continues to contribute up to a characteristic temperature $T_x(H)$. Nonlinear $I$-$V$ persists up to an even higher temperature $T_{h}(H)$ due to the depinning of vortices.Comment: 4 pages, 4 figures; Superstripes 2015 conferenc

Tending to the Spirit: A Proposal for Healing the Hearts of Black Children in Poverty

This article describes the public and private responses necessary to develop skills for low-income children to succeed. In order to fully comprehend the challenges facing these children, the article begins by explaining the statistics behind childhood poverty, including that children raised in poverty perform well below average in school and attend schools with significantly less resources. The article then turns to the concept of resiliency, which is a theory that children who develop positive internal strengths can overcome the burdens of poverty. Finally, the article explores how resiliency can be developed in children by examining three methods currently used in communities: Storytelling, the Girl Scouts of America, and the Alabama Blues Program. The article concludes by finding that, in addition to meeting the basic needs of impoverished children, children’s spirits can soar through these com munity programs—by being therapeutic, empowering, imaginative, chal lenging, and educational—and inspired to overcome the barriers of poverty

The Pinhole/Occulter Facility

Scientific objectives and requirements are discussed for solar X-ray observations, coronagraph observations, studies of coronal particle acceleration, and cosmic X-ray observations. Improved sensitivity and resolution can be provided for these studies using the pinhole/occulter facility which consists of a self-deployed boom of 50 m length separating an occulter plane from a detector plane. The X-ray detectors and coronagraphic optics mounted on the detector plane are analogous to the focal plane instrumentation of an ordinary telescope except that they use the occulter only for providing a shadow pattern. The occulter plane is passive and has no electrical interface with the rest of the facility