Kajian Waktu Evakuasi dengan Metode Simplified pada Kapal Perintis

Salah satu penyebab besarnya korban jiwa dalam sebuah kecelakaan kapal di jalur pelayaran adalah dikarenakan kurangnya informasi mengenai jalur atau rute evakuasi yang harus dilalui penumpang bila terjadi kecelakaan. Oleh sebab itu kajian mengenai jalur evakuasi utama didalam sebua kapal saat terjadinya kecelakaan perlu dilakukan dengan cermat. Terutama untuk kapal yang mengangkut banyak penumpang seperti kapal perintis. Pada paper ini akan dibahas mengenai kajian waktu evakuasi penumpang di kapal dengan metode simplified berdasarkan ketetapan dari IMO. Agar dapat mengetahui apakah waktu yang diperlukan penumpang untuk keluar dari kapal sudah memenuhi standart dari IMO. Beberapa parameter dibuat tetap seperti kecepatan orang berjalan yaitu 0.8 m/s. Dari hasil perhitungan yang dilakukan, waktu evakuasi seluruh penumpang pada kapal perintis masih dibawah standart dari IMO yaitu sekitar 56 menit 22 detik. Dimana titik kritis terdapat pada main deck dan titik kepadatan terdapat pada corridor di lantai tiga atau crew deck. Dimana terdapat 118 orang yang berkumpul untuk menuju tangga ke lantai empat atau bridge dec

Multipole methods for nanoantennas design: applications to Yagi-Uda configurations

International audienceWe present a detailed formalism allowing analytical calculations of the radiative properties of nanoantennas. This formalism does not rely on dipole approximations and utilizes multipolar multiple-scattering theory. The improvement in both accuracy and calculation speeds offered by this formulation provides significant advantages that are used in this work to study Yagi-Uda-type nanoantennas. We provide a study that questions the necessity of the reflector particle in nanoantennas

Ultracompact and unidirectional metallic antennas

International audienceWe investigate the angular redistribution of light radiated by a single emitter located in the vicinity of dipolar silver nanoparticles. We point out the fundamental role of the phase differences introduced by the optical path difference between the emitter and the particle and demonstrate that the polarizability of the metallic nanoparticle alone cannot predict the emission directionality. In particular, we show that collective or reflective properties of single nanoparticles can be controlled by tuning the distance of a single emitter at a λ/30 scale. These results enable us to design unidirectional and ultracompact nanoantennas composed of just two coupled nanoparticles separated by a distance achievable with biological linkers

Hubungan Beban Kerja Dengan Kejadian Hipertensi Pada Tenaga Pengajar Di SMA N 1 Amurang Kabupaten Minahasa Selatan

Salah satu faktor yang mempengaruhi terjadinya peningkatan tekanan darah adalah beban kerja yang dilakukan seseorang yang melebihi batas waktu normal. Suatu jenis pekerjaan yang dilakukan melebihi batas waktu kerja memicu terjadinya kelelahan kerja sehingga mempengaruhi aspek beban mental, fisik, dan waktu kerja. Hasil penelitian dari Riskesdas (2013) terhadap hipertensi menurut karakteristiknya didapat bahwa status pekerjaan juga dapat mempengaruhi terjadinya hipertensi dengan prevalensi sebesar 24,72%. Tujuan penelitian ini untuk mengetahui hubungan beban kerja dengan kejadian hipertensi di SMA N 1 Amurang Kabupaten Minahasa Selatan. Desain Penelitian yang digunakan bersifat observasional analitik yaitu cross sectional. Teknik pengambilan sampel dilakukan dengan accidental sampling dengan jumlah sampel 33 orang. Hasil penelitian menggunakan uji statistik chi square didapatkan nilai p = 0.023 < α = 0.05. Kesimpulan hasil penelitian menunjukkan adanya hubungan beban kerja dengan kejadian hipertensi pada tenaga pengajar di SMA N 1 Amurang Kabupaten Minahasa Selatan. Saran dapat ditambahkan sebagai informasi dibidang keperawatan medikal bedah untuk dijadikan acuan penelitian selanjutnya bahwa beban kerja yang berat memicu terjadinya hipertensi

Hubungan Tekanan Darah Sistolik Dengan Kualitas Tidur Pasien Hipertensi Di Puskesmas Bahu Manado

: Hypertension nationally has the highest ranked number in North Sulawesi. Hypertension is a chronic disease that affects the quality of life, which affects the quality of sleep. But the relationship between blood pressure with sleep quality in patients with hypertension is not clear in the know. This study aims to determine the relationship of systolic blood pressure in hypertensive patients with sleep quality in health center Bahu Manado. This research method uses analytical survey method, the cross sectional design on 60 respondents. Data collection using questionnaires Pittsburgh sleep quality sleep quality index (PSQI) and blood pressure measurements using a digital blood pressure Polygreen. Statistical tests were used to analyze the relationship between variables using chi square test obtained p = 0.001; á = 0.05. It is addressed that there is a significant correlation between systolic blood pressure in hypertensive patients with sleep quality in health centers Bahu Manado. The conclusion in this study most of the respondents had a systolic blood pressure of hypertension stage 1 for 73.3% and most of the respondents had poor sleep quality was 51.7%. Suggestions on this research is to further research is expected to be a reference and starting point for more research on blood pressure with sleep quality

Silicon Mie Resonators for Highly Directional Light Emission from monolayer MoS2

Controlling light emission from quantum emitters has important applications ranging from solid-state lighting and displays to nanoscale single-photon sources. Optical antennas have emerged as promising tools to achieve such control right at the location of the emitter, without the need for bulky, external optics. Semiconductor nanoantennas are particularly practical for this purpose because simple geometries, such as wires and spheres, support multiple, degenerate optical resonances. Here, we start by modifying Mie scattering theory developed for plane wave illumination to describe scattering of dipole emission. We then use this theory and experiments to demonstrate several pathways to achieve control over the directionality, polarization state, and spectral emission that rely on a coherent coupling of an emitting dipole to optical resonances of a Si nanowire. A forward-to-backward ratio of 20 was demonstrated for the electric dipole emission at 680 nm from a monolayer MoS2 by optically coupling it to a Si nanowire

Signatures of exciton coupling in paired nanoemitters

An exciton formed by the delocalized electronic excitation of paired nanoemitters is interpreted in terms of the electromagnetic emission of the pair and their mutual coupling with a photodetector. A formulation directly tailored for fluorescence detection is identified, giving results which are strongly dependent on geometry and selection rules. Signature symmetric and antisymmetric combinations are analyzed and their distinctive features identified

Small dielectric spheres with high Refractive index as new multifunctional elements for optical devices

The future of ultra-fast optical communication systems is inevitably connected with progress in optical circuits and nanoantennas. One of the key points of this progress is the creation of elementary components of optical devices with scattering diagrams tailored for redirecting the incident light in a desired manner. Here we demonstrate theoretically and experimentally that a small, simple, spatially homogeneous dielectric subwavelength sphere with a high refractive index and low losses (as some semiconductors in the visible or near infrared region) exhibits properties allowing to utilize it as a new multifunctional element for the mentioned devices. This can be achieved by taking advantage of the coherent effects between dipolar and multipolar modes, which produce anomalous scattering effects. The effects open a new way to control the directionality of the scattered light. The directional tuning can be obtained in a practical way just by a change in the frequency of the incident wave, and/or by a well-chosen diameter of the sphere. Dielectric nanoparticles with the required optical properties in the VIS-NIR may be now readily fabricated. These particles could be an efficient alternative to the widely discussed scattering units with a more complicated design.This research was partly supported by MICINN (Spanish Ministry of Science and Innovation) through project FIS2013-45854-P and by the Ministry of Education and Science of Russian Federation through grant 14.Z50.31.0034