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

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

Acceleration and vacuum temperature

The quantum fluctuations of an "accelerated" vacuum state, that is vacuum fluctuations in the presence of a constant electromagnetic field, can be described by the temperature \TEH. Considering \TEH for the gyromagnetic factor $g=1$ we show that \TEH(g=1)=\THU, where \THU is the Unruh temperature experienced by an accelerated observer. We conjecture that both particle production and nonlinear field effects inherent in the Unruh accelerated observer case are described by the case $g=1$ QED of strong fields. We present rates of particle production for $g=0,1,2$ and show that the case $g=1$ is experimentally distinguishable from $g=0,2$. Therefore, either accelerated observers are distinguishable from accelerated vacuum or there is unexpected modification of the theoretical framework.Comment: 4 pages, 1 figure; expanded discussion of experimental observables, added references, version appearing in Phys Rev

Penerapan Media Diorama Skala terhadap Kemampuan Berpikir Tingkat Tinggi Siswa Kelas V SD Negeri 1 Ujungpandan

IndonesiaPendahuluan: Hasil belajar matematika masih menjadi salah satu terendah dibandingkan dengan mata pelajaran yang lain. Hal ini dikarenakan kurangnya media pembelajaran yang dapat membantu memahami materi begitu pula dengan kemampuan berpikir siswa masih cenderung rendah. Sehingga berakibat siswa menjadi kurang mampu menyelesaikan masalah matematika. Oleh karena itu, perlunya membekali siswa untuk dapat berpikir tingkat tinggi pada tahap analisis agar memiliki kemampuan memecahkan masalah matematika melalui media. Salah satu media yang diterapkan adalah Diorama Skala (DIMAS). Tujuan dalam penelitian ini untuk mengetahui penerapan media DIMAS dalam kemampuan berpikir tingkat tinggi siswa kelas V Sekolah Dasar. Metode: Metode eksperimen dengan cara memberikan perlakuan terhadap satu kelas dalam kegiatan belajar mengajar. Desain penelitian yang digunakan adalah Pre-Experimental dengan jenis one group pretest and posttest design. Hasil: Siswa memiliki kemampuan analisis kategori sangat baik dan baik sebanyak 50% sedangkan siswa berkemampuan analisis cukup dan kurang memiliki presentase 50%.EnglishIntroduction: Mathematics learning outcomes is still one of the lowest compared with other lessons. This is due to the lack of media that can help understand the material as well as the students thinking skills are still to be low. Resulting in students becoming less capable of solving mathematical problems. Therefore, the need to equip students for higher-level thinking at this stage of the analysis in order to have the ability to solve mathematical problems through media. One of media applied is Diorama Scale (DIMAS). The purpose of this research to determine the application DIMAS media in high order thinking skills Elementary School fifth grade students. Method: Experimental method by providing treatment to one class in learning activities. The study design used is Pre-Experimental with the kind of one group pretest and posttest. Result: Students have excellent analytical skills and excellent category as much as 50% while our analysis capable students and less has a percentage of 50%

Waves of intermediate length through an array of vertical cylinders

We report a semi-analytical theory of wave propagation through a vegetated water. Our aim is to construct a mathematical model for waves propagating through a lattice-like array of vertical cylinders, where the macro-scale variation of waves is derived from the dynamics in the micro-scale cells. Assuming infinitesimal waves, periodic lattice configuration, and strong contrast between the lattice spacing and the typical wavelength, the perturbation theory of homogenization (multiple scales) is used to derive the effective equations governing the macro-scale wave dynamics. The constitutive coefficients are computed from the solution of micro-scale boundary-value problem for a finite number of unit cells. Eddy viscosity in a unit cell is determined by balancing the time-averaged rate of dissipation and the rate of work done by wave force on the forest at a finite number of macro stations. While the spirit is similar to RANS scheme, less computational effort is needed. Using one fitting parameter, the theory is used to simulate three existing experiments with encouraging results. Limitations of the present theory are also pointed out.Cornell University (Mary Upson visiting professorship