Hybrid exciton-polaritons in a bad microcavity containing the organic and inorganic quantum wells

We study the hybrid exciton-polaritons in a bad microcavity containing the organic and inorganic quantum wells. The corresponding polariton states are given. The analytical solution and the numerical result of the stationary spectrum for the cavity field are finishedComment: 3 pages, 1 figure. appear in Communications in Theoretical Physic

Interface-Controlled Ferroelectricity at the Nanoscale

Recent experimental results demonstrate that in thin films ferroelectricity persists down to film thickness of a few unit cells. This finding opens an avenue for novel electronic devices based on ultathin ferroelectrics, but also raises questions about factors controlling ferroelectricity and the nature of the ferroelectric state at the nanoscale. Here we report a first-principles study of KNbO3 ferroelectric thin films placed between two metal electrodes, either SrRuO3 or Pt. We show that the bonding at the ferroelectric-metal interface imposes severe constraints on the displacement of atoms, destroying the bulk tetragonal soft mode in thin ferroelectric films. This does not, however, quench local polarization. If the interface bonding is sufficiently strong the ground state represents a ferroelectric double-domain structure, driven by the intrinsic oppositely-oriented dipole moments at the two interfaces. Although the critical thickness for the net polarization of KNbO3 film is finite - about 1 nm for Pt and 1.8 nm for SrRuO3 electrodes - local polarization persists down to thickness of a unit cell.Comment: 5 pages, 4 figure

Pembelajaran Kontekstual Untuk Meningkatkan Pemahaman Konsep Matematika Materi Sistem Nilai Tempat Pada Siswa Kelas I SD

Perumusan masalah pada penelitian ini yaitu: a) apakah pembelajaran kontekstual dapat meningkatkan pemahaman konsep Matematika materi sistem nilai tempat pada siswa kelas I SD 1 Mlatinorowito, Kudus ? b) apakah dengan menggunakan pembelajaran kontekstual hasil belajar siswa kelas I SD 1 Mlatinorowito, Kudus dapat meningkatkan hasil belajar diatas KKM (kriteria ketuntasan minimal) ? Penelitian ini bertujuan untuk meningkatkan kualitas pembelajaran secara umum, secara khusus bertujuan antara lain sebagai berikut: untuk mengetahui peningkatan pemahaman konsep Matematika sistem nilai tempat pada siswa kelas I SD 1 Mlatinorowito melalui pembelajaran kontekstual dan meningkatkan hasil belajar siswa diatas KKM (kriteria ketuntasan minimal) pada siswa kelas I SD 1 Mlatinorowito. Metode penelitiannya dengan pengumpulan data hasil belajar siswa, aktivitas siswa, data hasil pemahaman konsep siswa dalam kegiatan belajar mengajar dan kemampuan guru dalam pembelajaran. Analisis instrumen mengunakan validitas, reliabilitas, tingkat kesukaran dan daya pembeda. Subyek penelitian meliputi seluruh siswa kelas I SD 1 Mlatinorowito yang berjumlah 24 siswa terdiri 17 putra dan 7 putri. Penelitian ini berlangsung selama tiga siklus. Hasil penelitian menunjukkan bahwa pembelajaran Matematika dengan menggunakan pembelajaran kontekstual dapat meningkatkan dapat meningkatkan hasil belajar siswa sesuai analisis data diketahui nilai rata-rata pada siklus I: 67,25 Siklus II: 69,5 menjadi 72,5 pada siklus III. Aktivitas siswa dalam pembelajaran meningkat dari hasil siklus I mendapat skor rata-rata 62,7% kriteria aktif, pada siklus II mendapat skor rata-rata 68,33 kriteria aktif, dan pada siklus III mendapat skor rata-rata 75,62 kriteria sangat aktif. Data hasil pemahaman konsep siswa dalam Kegiatan belajar mengajar tentang sistem nilai tempat meningkat dari hasil siklus I mendapat nilai rata-rata 66,46 kriteria cukup, siklus II mendapat nilai rata-rata 77,5 kriteria baik, dan pada siklus III mendapat nilai rata-rata 85,625 kriteria sangat baik, Kemapuan guru dalam mengelola pembelajaran mengalami peningkatan pada tiap siklus. Terlihat dari dari siklus I rata-rata kemampuan guru cukup baik yaitu 64,44% menjadi 69,63% pada siklus II dalam kriteria baik dan pada siklus III meningkat menjadi 74, 1% dengan kriteria sangat baik. Dari analisis tersebut terbukti dapat meningkatkan pemahaman konsep matematika materi sistem nilai tempat pada siwa kelas I SD 1 Mlatinorowito, Kec. Kota, Kab. Kudus

Bending and wrinkling as competing relaxation pathways for strained free-hanging films

An equilibrium phase diagram for the shape of compressively strained free-hanging films is developed by total strain energy minimization. For small strain gradients {\Delta}{\epsilon}, the film wrinkles, while for sufficiently large {\Delta}{\epsilon}, a phase transition from wrinkling to bending occurs. We consider competing relaxation mechanisms for free-hanging films, which have rolled up into tube structures, and we provide an upper limit for the maximum achievable number of tube rotations.Comment: 4 pages, 4 figure

Multivariate adaptive regression splines for estimating riverine constituent concentrations

Regression-based methods are commonly used for riverine constituent concentration/flux estimation, which is essential for guiding water quality protection practices and environmental decision making. This paper developed a multivariate adaptive regression splines model for estimating riverine constituent concentrations (MARS-EC). The process, interpretability and flexibility of the MARS-EC modelling approach, was demonstrated for total nitrogen in the Patuxent River, a major river input to Chesapeake Bay. Model accuracy and uncertainty of the MARS-EC approach was further analysed using nitrate plus nitrite datasets from eight tributary rivers to Chesapeake Bay. Results showed that the MARS-EC approach integrated the advantages of both parametric and nonparametric regression methods, and model accuracy was demonstrated to be superior to the traditionally used ESTIMATOR model. MARS-EC is flexible and allows consideration of auxiliary variables; the variables and interactions can be selected automatically. MARS-EC does not constrain concentration-predictor curves to be constant but rather is able to identify shifts in these curves from mathematical expressions and visual graphics. The MARS-EC approach provides an effective and complementary tool along with existing approaches for estimating riverine constituent concentrations

Robust Energy and Reserve Dispatch Under Variable Renewable Generation

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Peningkatan Kreativitas melalui Bermain Balok pada Anak Usia 5-6 Tahun di Paud Bina Insan

This research is motivated lack of creativity of children in early childhood level Bina Insan Southeast Pontianak. Researchers as teachers strive to improve children's creativity through playing blocks. This research uses descriptive method to the form class tindakkan research (PTK). This class tindakkan study was conducted in two cycles, in each cycle was conducted in three sessions. Techniques of data collection through observation, communication and documentation while using the data collection tools guide the interview and observation. Based on the results of research conducted through play in creating a beam with a beam shape is very well developed category by 66.7%. Provide variations on the form he created with very well developed category by 60%. Telling shape made ​​with very well developed category by 66.7%

Imprints of Environment on Cluster and Field Late-type Galaxies at z~1

We present a comparison of late-type galaxies (Sa and later) in intermediate redshift clusters and the field using ACS imaging of four cluster fields: CL0152-1357, CL1056-0337 (MS1054), CL1604+4304, and CL1604+4321. Concentration, asymmetry, and clumpiness parameters are calculated for each galaxy in blue (F606W or F625W) and red (F775W or F814W) filters. Galaxy half-light radii, disk scale lengths, color gradients, and overall color are compared. We find marginally significant differences in the asymmetry distributions of spiral and irregular galaxies in the X-ray luminous and X-ray faint clusters. The massive clusters contain fewer galaxies with large asymmetries. The physical sizes of the cluster and field populations are similar; no significant differences are found in half-light radii or disk scale lengths. The most significant difference is in rest-frame $U-B$ color. Late-type cluster galaxies are significantly redder, $\sim 0.3$ magnitudes at rest-frame $U-B$, than their field counterparts. Moreover, the intermediate-redshift cluster galaxies tend to have blue inward color gradients, in contrast to the field galaxies, but similar to late-type galaxies in low redshift clusters. These blue inward color gradients are likely to be the result of enhanced nuclear star formation rates relative to the outer disk. Based on the significant rest-frame color difference, we conclude that late-type cluster members at $z\sim0.9$ are not a pristine infalling field population; some difference in past and/or current star formation history is already present. This points to high redshift ``groups'', or filaments with densities similar to present-day groups, as the sites where the first major effects of environment are imprinted.Comment: updated titl

Strongly coupled matter near phase transition

In the Hartree approximation of Cornwall-Jackiw-Tomboulis (CJT) formalism of the real scalar field theory, we show that for the strongly coupled scalar system near phase transition, the shear viscosity over entropy density is small, however, the bulk viscosity over entropy density is large. The large bulk viscosity is related to the highly nonconformal equation of state. It is found that the square of the sound velocity near phase transition is much smaller than the conformal value 1/3, and the trace anomaly at phase transition deviates far away from 0. These results agree well with the lattice results of the complex QCD system near phase transition.Comment: 6 pages, 2 figures, 1 table, contributed to the International Conference on Strangeness in Quark Matter 2008, Beijing, China, 6-10 October 200