UJI KONTROL KUALITAS PESAWAT RADIOLOGI INTERVENSIONAL

Telah dilakukan penelitian uji kontrol kualitas pada tiga pesawat sinar-X fluoroskopi intervensional dengan spesifikasi berbeda. Jenis pengujian yang dilakukan diantaranya uji kolimasi, uji generator dan tabung sinar-X, dosimetri, dan kualitas citra. Secara umum hasil pengujian ketiga pesawat memiliki kualitas yang cukup baik, ditinjau dalam hal generator dan tabung, dosimetri dan kualitas citra. Hasil penelitian menunjukkan perbedaan karakter ketiga pesawat yang diujikan. Pada pesawat I dan II umumnya digunakan pada pemeriksaan intervensional memiliki karakter yang sama sedangkan pada pesawat III khusus digunakan untuk pemeriksaan pediatrik (anak-anak) menggunakan kVp rendah untuk meningkatkan kontras citra dan mA tinggi untuk mendapatkan kualitas citra yang baik pada monitor displai

Facile fabrication of lateral nanowire wrap-gate devices with improved performance

We present a simple fabrication technique for lateral nanowire wrap-gate devices with high capacitive coupling and field-effect mobility. Our process uses e-beam lithography with a single resist-spinning step, and does not require chemical etching. We measure, in the temperature range 1.5-250 K, a subthreshold slope of 5-54 mV/decade and mobility of 2800-2500 $cm^2/Vs$ -- significantly larger than previously reported lateral wrap-gate devices. At depletion, the barrier height due to the gated region is proportional to applied wrap-gate voltage.Comment: 3 pages, 3 figure

Quantum Coherence in Ergodic and Many-Body Localized Systems

Quantum coherence quantifies the amount of superposition a quantum state can have in a given basis. Since there is a difference in the structure of eigenstates of the ergodic and many-body localized systems, we expect them also to differ in terms of their coherences in a given basis. Here, we numerically calculate different measures of quantum coherence in the excited eigenstates of an interacting disordered Hamiltonian as a function of the disorder. We show that quantum coherence can be used as an order parameter to detect the well-studied ergodic to many-body-localized phase transition. We also perform quantum quench studies to distinguish the behavior of coherence in thermalized and localized phases. We then present a protocol to calculate measurement-based localizable coherence to investigate the thermal and many-body localized phases. The protocol allows one to investigate quantum correlations experimentally in a non-destructive way, in contrast to measures that require tracing out a subsystem, which always destroys coherence and correlation.Comment: 5 pages, 4 figure

Implementation on Maximizing Network Topology Lifetime using Mobile Node Rotation

Wireless sensor network (WSN) is facing key challenges like extending network lifetime due to sensor nodes having limited power supplies. Extending WSN lifetime is complicated because nodes often experience differential power consumption. For example, nodes closer to the sink in a given routing topology transmit more data and thus consume power more rapidly than nodes farther from the sink. Inspired by the huddling behavior of emperor penguins where the penguins take turns on the cold extremities of a penguin �huddle�, we propose mobile node rotation, a new method for using low-cost mobile sensor nodes to address differential power consumption and extend WSN lifetime. Specifically, we propose to rotate the nodes through the high power consumption locations. We propose efficient algorithms for single and multiple rounds of rotations