Modulational instability criteria for two-component Bose-Einstein condensates

The stability of colliding Bose-Einstein condensates is investigated. A set of coupled Gross-Pitaevskii equations is thus considered, and analyzed via a perturbative approach. No assumption is made on the signs (or magnitudes) of the relevant parameters like the scattering lengths and the coupling coefficients. The formalism is therefore valid for asymmetric as well as symmetric coupled condensate wave states. A new set of explicit criteria is derived and analyzed. An extended instability region, in addition to an enhanced instability growth rate is predicted for unstable two component bosons, as compared to the individual (uncoupled) state.Comment: 4 pages, 1 figur

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PEMANFAATAN ALAT PERAGA RANGKA TUBUH UNTUK MENINGKATKAN KEMAMPUAN COMPREHENSION SISWA PADA KONSEP SISTEM GERAK MANUSIA

“Pemanfaatan Alat Peraga Rangka Tubuh untuk Meningkatkan Kemampuan Comprehension Siswa pada Konsep Sistem Gerak Manusia”, Pembimbing 1 Prof. Dr. H. Toto Sutarto Gani Utari, M.Pd ., dan Pembimbing 2 Dr. H. Uus Toharudin, M.Pd . Tujuan penelitian ini adalah untuk mengetahui apakah ada peningkatan comprehension (pemahaman) kelas XI dengan memanfaatkan alat peraga rangka tubuh pada konsep sistem gerak manusia. Penelitian ini menggunakan metode Pre - Experimental Designs , di mana tidak ada penelitian variabel kontrol dan sampel tidak dipilih secara random. Populasi dari penelitian ini adalah siswa kelas XI SMA Pasundan 2 Cimahi, yaitu kelas XI IPA 2 yang berjumlah 30 orang. I nstrumen penelitian ini berupa tes pengetahuan dengan soal - soal pilihan ganda berjumlah 3 6 soal. Tes terdiri dua tahapan yaitu pre test dan posttest . Dari hasil penelitian di dapatkan nilai rata – rata pretest 39. 6 7 dan rata – rata posttest sebesar 78.33 . Setelah di lakukan penelitian pretest dan posttest peneliti melanjutkan dengan uji t dan di peroleh dengan hasil uji t signifikan karena di da patkan hasi hitung t hit > t tab = > 2.66. sehingga dapat di simpulkan bahwa “Pemanfaatan Alat Peraga Rangka Tubuh untuk Meningkatkan Kemampuan Comprehension Siswa pada Konsep Sistem Gerak Manusia” dapat meningkatkan kemampuan comprehension (pemahaman ). Kata Kunci : Alat peraga rangka tubuh, kemampuan comprehension (pemahaman), sistem gerak manusia

Creating Ioffe-Pritchard micro-traps from permanent magnetic film with in-plane magnetization

We present designs for Ioffe-Pritchard type magnetic traps using planar patterns of hard magnetic material. Two samples with different pattern designs were produced by spark erosion of 40 $\mu$m thick FePt foil. The pattern on the first sample yields calculated axial and radial trap frequencies of 51 Hz and 6.8 kHz, respectively. For the second sample the calculated frequencies are 34 Hz and 11 kHz. The structures were used successfully as a magneto-optical trap for $^{87}$Rb and loaded as a magnetic trap. A third design, based on lithographically patterned 250 nm thick FePt film on a Si substrate, yields an array of 19 traps with calculated axial and radial trap frequencies of 1.5 kHz and 110 kHz, respectively.Comment: 8 pages, 5 figures Revised and accepted for EPJD, improved picture

The Lorentz and CPT violating effects on the Z\to l^+ l^- decay

We study the Lorentz and CPT violating effects on the branching ratio BR, the CPT violating asymmetry A_{CPT} and the ratio of the decay width, including only the Lorentz violating effects, to the one obtained in the standard model, for the flavor dependent part of the lepton flavor conserving Z\to l^+ l^- (l=e,\mu,\tau) decay. The inclusion of the Lorentz and CPT violating effects to the standard model contribution is too small to be detected, since the corresponding coefficients are highly suppressed at the low energy scale.Comment: 11 pages, 6 figure

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Frederick Schonmaker -- Heirs of

33-2Revolutionary ClaimsReport : Petition of Heirs of F. Schonmaker. [808] Indian depredations; Revolutionary War; New York.1855-3

Dwight J. McCann.

42-2ClaimsReport : Claim of of D. McCann. [1543] Indian goods transported from Omaha to Fort Laramie, the Winnebago agency, the Omaha agency, and the Pawnee agency.1872-12