Single carbon nanotubes as ultrasmall all-optical memories

Performance improvements are expected from integration of photonic devices into information processing systems, and in particular, all-optical memories provide a key functionality. Scaling down the size of memory elements is desirable for high-density integration, and the use of nanomaterials would allow for devices that are significantly smaller than the operation wavelengths. Here we report on all-optical memory based on individual carbon nanotubes, where adsorbed molecules give rise to optical bistability. By exciting at the high-energy tail of the excitonic absorption resonance, nanotubes can be switched between the desorbed state and the adsorbed state. We demonstrate reversible and reproducible operation of the nanotube optical memory, and determine the rewriting speed by measuring the molecular adsorption and desorption times. Our results underscore the impact of molecular-scale effects on optical properties of nanomaterials, offering new design strategies for photonic devices that are a few orders of magnitude smaller than the optical diffraction limit.Comment: 8 pages, 6 figure

Survival of shrines from the 2011 Great Tsunami

A massive earthquake with a magnitude of 9.0 occurred on March 11, 2011, and a powerful tsunami devastated a large area along Japan???s eastern coastline. We investigated the tsunami damage using satellite images and aerial photographs, and visited damaged sites including 27 shrines near the coast in 2011 and 2012. It was found that all but two of these shrines survived the tsunami, even though the tsunami height differed from place to place. As a memorial to people who lost their lives in previous tsunamis, shrines were built on safe places where people can evacuate. Many of these shrines were undamaged because their elevation was higher than the tsunami height, and the lives of people who evacuated to the shrines were saved

Pengembangan Model Pembelajaran Kooperatif Handep Untuk Pembelajaran Matematika

Penelitian ini bertujuan untuk mengembangkan Model Pembelajaran Kooperatif berbasis mekanisme gotong royong Handep. Handep adalah bentuk gotong royong suku Dayak Kalimantan Tengah. Model pembelajaran diberi nama Model Pembelajaran Kooperatif (MPK) Handep. Pengembangan MPKHandep dilakukan dengan menyusun buku ajar tentang MPK Handep. Hasil pengembangan divalidasi melalui uji ahli Teknolog Pembelajaran dalam tiga tahapan, dan disimpulkan bahwa preskripsi komponen-komponen MPK Handep telah layak dijadikan sebagai model pembelajaran. Validasi kelompok kecil menunjukkan, MPK Handep telah memenuhi prinsip-prinsip pembelajaran efektif (95,59%), elemen-elemen pembelajaran kooperatif (98,68%), dan kaidah-kaidah Quantum Teaching(75%). Ketercapaian penguasaan kemampuan pemecahan masalah kajian himpunan sebagai dampak instruksional (92%) dan penguasaan keterampilan sosial (91,7%) sebagai dampak pengiring implementasi MPK Handep. The purpose of research developed cooperative learning model based on mechanism of mutual cooperation handep. Handep is the form of collaboration in Dayak Ngaju tribe (Central Kalimantan). The models of teaching and learning namely Handep Cooperative Learning. The model was developed by designing theoretical model of MPK Handep and then validation that model. Cooperative Learning Handep validated by expert in Instructional Technology in three phases and field research in small group of students. The result from the expert validation, that Cooperative Learing Handep prescriptions was sufficiently as a model of learning. The result from field research, that Cooperative Learning Handep were sufficiently for the principles of learning effective (95,59%), the elements of cooperative learning (98,68%), and principles of the Quantum Teaching (75%). Problem solving ability as instructional effect was achieved (92%) and social skill as nurturant effect (91,70%)