Charge-coupled devices with fast timing for astrophysics and space physics research

A charge coupled device is under development with fast timing capability (15 millisecond full frame readout, 30 microsecond resolution for measuring the time of individual pixel hits). The fast timing CCD will be used in conjunction with a CsI microfiber array or segmented scintillator matrix detector to detect x rays and gamma rays with submillimeter position resolution. The initial application will be in conjunction with a coded aperture hard x ray/gamma ray astronomy instrument. We describe the concept and the readout architecture of the device

Superconducting microstrip detectors

Superconducting NbN microstrip counters feature radiation hardness two orders of magnitude higher than conventional Si strip detectors, spatial resolution limited only by lithographic techniques (0.1 - 2 microns), intrinsic signal rise time of 2 ps, and signal transport over large distances without losses. The aim of this proposal is to improve understanding of the physics of such detectors and to establish their large- scale feasibility

Sistem Automasi Zero Touch Provisioning Routerboard Berbasis GraphQL API

Dalam sistem perangkat jaringan modern, idealnya sebuah perangkat jaringan memiliki manajemen sistem yang terpusat. Sistem manajemen terpusat yang baik memiliki kemampuan tidak sekedar monitoring, melainkan juga provisioning dan kegiatan administratif lain. Permasalahan yang dihadapi yakni perangkat jaringan routerboard tidak mampu melakukan provisioning secara mandiri dan otomatis. Untuk mengatasi masalah tersebut, perlu adanya sebuah sistem manajemen modern yang mampu melakukan provisioning secara otomatis, monitoring, dan juga administrasi konfigurasi secara massal. Dengan melakukan observasi dan studi literatur diketahui penggunaan routerboard dapat dimaksimalkan dengan fitur command line berupa HTTP request dan pemanfaatan arsitektur API. Penelitian ini mampu membuat sistem automasi zero touch provisioning routerboard, dengan menggunakan framework PHP Laravel dan GraphQL API. Hasil penelitian membuktikan bahwa sistem automasi mampu melakukan zero touch provisioning dengan memanfaatkan command line HTTP request untuk routerboard berkomunikasi ke server controller. Sedangkan untuk administrasi konfigurasi antara server controller ke routerboard, dilakukan melalui proses pemanggilan API. Pengujian yang dilakukan menunjukkan bahwa rata-rata durasi yang dibutuhkan dalam proses zero touch provisioning routerboard yakni 8.851ms

Foliage surface ozone deposition : a role for surface moisture?

Peer reviewe

Superconducting Nb-film LC resonator

Sputtered Nb thin-film LC resonators for low frequencies at 0.5 MHz have been fabricated and tested in the temperature range 0.05--1 K in magnetic fields up to 30 mT. Their Q value increases towards decreasing temperature as sqrt(T) and reaches 10^3 at 0.05 K. As a function of magnetic field Q is unstable and displays variations up to 50%, which are reproducible from one field sweep to the next. These instabilities are attributed to dielectric losses in the plasma deposited SiO_2 insulation layer, since the thin-film coil alone reaches a Q > 10^5 at 0.05 K.Comment: 6 pages, 7 figures, submitted to Review of Scientific Instrument

Enrichment and sequencing of phosphopeptides on indium tin oxide coated glass slides

Unambiguous identification of phosphorylation sites is of premier importance to biologists, who seek to understand the role of phosphorylation from the perspective of site-specific control of biological phenomena. Despite this widely asked and highly specific information, many methods developed are aimed at analysis of complete proteomes, indeed even phospho-proteomes, surpassing the basic requests of many biologists. We have therefore further developed a simple method that specifically deals with the analysis of multiple phosphorylation sites on singular proteins or small collections of proteins. With this method, the whole purification process, from sample application to MALDI-MS analysis, can be performed on commercially available indium tin oxide (ITO) coated glass slides. We show that fifteen (15) samples can be purified within one hour, and that low femtomole sensitivity can be achieved. This limit of identification is demonstrated by the successful MS/MS-based identification of 6 fmol of monophosphopeptide from beta-casein. We demonstrate that the method can be applied for identifying phosphorylation sites from recombinant and cell-derived biological protein samples. Since ITO-coated glass slides are inexpensive and available from several suppliers the method is readily and inexpensively available to other researchers. Taken together, the presented protocols and materials render this method as an extremely fast and sensitive phosphopeptide identification protocol that should aid biologists in discovery and validation of phosphorylation sites

Superconducting NbN microstrip detectors

Superconducting NbN strip transmission line counters and coupling circuits were processed on silicon wafers using thin film techniques, and they were characterized with several methods to verify the design principles. The stripline circuits, designed using microwave design rules, were simulated using a circuit design tool enhanced to include modelling of the superconducting lines. The strips, etched out of the 282 nm thick top NbN film with resistivity 284 µ?cm at 20 K, have critical temperatures in the range 12 to 13 K and a critical current density approximately Jc(0) = 3.3·105 A/cm2. The linearized heat transfer coefficient between the strip and the substrate is approximately 1.1·105 W/(m2K) and the healing length is about 1.6 µm between 3 and 5 K temperatures. Traversing 5 MeV a-particles caused the strips to quench. No events due to electrons could be detected in agreement with the predicted signal amplitude which is below the noise threshold of our wideband circuitry. The strip bias current and hence the signal amplitude were limited due to a microbridge at the isolator step of the impedance transformer