Development of wireless RTD temperature measurement using decade box

The project proposed is to develop GUI (Graphical User Interface) application using visual basic. Wireless system is interfacing between camputer-based and instrument for temperature measurement to measure temperature where the data from measurement process can be directly use for other purpose, such as calculation and data monitoring. This project will involve designing the GUI application to monitor temperature changes using visual basic 2008. Manual method in temperature measurement are measure and calculate the data manually. The system is developed to facilitate for taking the data directly from the computer. This project will use the wireless RTD system as a sensor to interface between computer and temperature instrument such as temperature transmitter. Wireless RTD system that will use is called Zig-bee technology. Zig-bee technology are self configuring short range network and low cost. Decade box will use as a testing and calibration to create a resistance or capacitance with a specific value by using a combination of the rotary decade switches. For this project, the expected outcome is GUI application will monitor temperature changes through Zigbee wireless system. This project will make the wireless process instrumentation and wireless terminal technology for instrumentation directly leads to efficient process and equipment validation in current technology

Spatial Persistence of Fluctuating Interfaces

We show that the probability, P_0(l), that the height of a fluctuating (d+1)-dimensional interface in its steady state stays above its initial value up to a distance l, along any linear cut in the d-dimensional space, decays as P_0(l) \sim l^(-\theta). Here \theta is a `spatial' persistence exponent, and takes different values, \theta_s or \theta_0, depending on how the point from which l is measured is specified. While \theta_s is related to fractional Brownian motion, and can be determined exactly, \theta_0 is non-trivial even for Gaussian interfaces.Comment: 5 pages, new material adde

A 3D insight on the catalytic nanostructuration of few-layer graphene

The catalytic cutting of few-layer graphene is nowadays a hot topic in materials research due to its potential applications in the catalysis field and the graphene nanoribbons fabrication. We show here a 3D analysis of the nanostructuration of few-layer graphene by iron-based nanoparticles under hydrogen flow. The nanoparticles located at the edges or attached to the steps on the FLG sheets create trenches and tunnels with orientations, lengths and morphologies defined by the crystallography and the topography of the carbon substrate. The cross-sectional analysis of the 3D volumes highlights the role of the active nanoparticle identity on the trench size and shape, with emphasis on the topographical stability of the basal planes within the resulting trenches and channels, no matter the obstacle encountered. The actual study gives a deep insight on the impact of nanoparticles morphology and support topography on the 3D character of nanostructures built up by catalytic cutting

Superconducting Properties of MgCNi3 Films

We report the magnetotransport properties of thin polycrystalline films of the recently discovered non-oxide perovskite superconductor MgCNi3. CNi3 precursor films were deposited onto sapphire substrates and subsequently exposed to Mg vapor at 700 C. We report transition temperatures (Tc) and critical field values (Hc2) of MgCNi3 films ranging in thickness from 7.5 nm to 100 nm. Films thicker than ~40 nm have a Tc ~ 8 K, and an upper critical field Hc2 ~ 14 T, which are both comparable to that of polycrystalline powders. Hall measurements in the normal state give a carrier density, n =-4.2 x 10^22 cm^-3, that is approximately 4 times that reported for bulk samples.Comment: submitted to PR

Ice Formations Monitoring and intervention on the rivers in Romania in January-February 2017

This article presents ice monitoring and intervention on the rivers in Romania in January-February, 2017. After a long period in January with very low temperatures, there were positive temperatures with significant rainfall in the first decade, causing ice flows followed by ice jams and floods. In order to reduce the damage done by overflowing rivers ”Romanian Waters” National Administration employees from Alba, Bistrița-Năsăud, Brașov, Covasna, Harghita, Maramureș, Mureș and Suceava counties participated in the operation. Pyrotechnics teams from County Inspectorate for Emergency Situations intervened in the following counties: Alba, Bistrița-Năsăud, Maramureș, Mureș, Suceava and Vâlcea counties. There has been reported damages in Alba, Bistriţa-Năsăud, Botoşani, Harghita, Hunedoara, Iaşi, Maramureş, Mureş and Suceava. The most affected county was Bistriţa-Năsăud, the most pyrotechnical interventions occurred in Suceava. The intervention with special pyrotechnical equipment makes damage insignificant as it happened in Braşov, Covasna and Vâlcea counties

Realization of a Tunable Artificial Atom at a Supercritically Charged Vacancy in Graphene

The remarkable electronic properties of graphene have fueled the vision of a graphene-based platform for lighter, faster and smarter electronics and computing applications. One of the challenges is to devise ways to tailor its electronic properties and to control its charge carriers. Here we show that a single atom vacancy in graphene can stably host a local charge and that this charge can be gradually built up by applying voltage pulses with the tip of a scanning tunneling microscope (STM). The response of the conduction electrons in graphene to the local charge is monitored with scanning tunneling and Landau level spectroscopy, and compared to numerical simulations. As the charge is increased, its interaction with the conduction electrons undergoes a transition into a supercritical regime 6-11 where itinerant electrons are trapped in a sequence of quasi-bound states which resemble an artificial atom. The quasi-bound electron states are detected by a strong enhancement of the density of states (DOS) within a disc centered on the vacancy site which is surrounded by halo of hole states. We further show that the quasi-bound states at the vacancy site are gate tunable and that the trapping mechanism can be turned on and off, providing a new mechanism to control and guide electrons in grapheneComment: 18 pages and 5 figures plus 14 pages and 15 figures of supplementary information. Nature Physics advance online publication, Feb 22 (2016