RO – Page 4 – TechConnect Briefs

Nanoscale Maghemite Iron Oxide Powders Prepared by Laser Pyrolysis

Morjan I., Dumitrache F., Alexandrescu R., Birjega R., Voicu I., Gavrila L., Soare I., Filotti G., Kuncser V., Ciupina V., National Institute for Lasers, Plasma and Radiation Physics, RO

Nano-sized maghemite particles (usually less than 15 nm diameter) have been directly synthesized by the laser induced pyrolysis of iron pentacarbonyl vapors. Ethylene was used as sensitizer of the induced reaction. By the controlled use [...]

Structural and magnetic characterization of 3d metal clusters embedded in fullerite matrices

Teodorescu C.-M., Macovei D., National Institute of Materials Physics, RO

Metal clusters embedded in fullerite matrices are produced by high vacuum co-evaporation. XPS and X-ray absorption revealed that the metal clusters are protected against contamination. XRD analysis is used to determine the average custer size, [...]

Nanostructured photocatalytic TiO2-xNx thin films prepared by reactive magnetron sputtering

Teodorescu C.-M., Luca D., National Institute of Materials Physics, RO

Nitrogen-doped titania films were grown by magnetron sputtering. XPS analysis was used to identify the nitrogen content and the oxygen stoichiometry of the samples. XANES evidenced an increase of the Ti 3d charge density. XRD [...]

High Accuracy Exponential Function Generator for Analog Signal Processing

Popa C., University Politehnica of Bucharest, RO

A new CMOS current-mode pseudo-exponential circuit based on the superior-order Taylor series expansion will be presented. The advantage of the circuit with respect to the previous reported similar ones is the smaller value of the [...]

A Nano-Transistor with a Cavity

Ravariu C., Ravariu F., Rusu A., Profirescu M., Ravariu C., Ravariu F., Politehnica University of Bucharest, RO

A SOI nanotransistor with a cavity was simulated. The global current is a superposition of a tunnel current through the cavity and an inversion current at the film bottom. The tunnel source-drain current prevails in [...]

Synthesis and Properties of Magnetic Nanoparticles with Potential Applications in Cancer Diagnostic

Neamtu J., Jitaru I., Malaeru T., Georgescu G., Kappel W., Alecu V.-V., National Institute for Research, RO

The size, shape and composition of magnetic nanoparticles are very attractive for diagnostic tools of cancer tumors and targeting treatment in HIV infection. The goal of this paper is the preparation from colloidal solutions of [...]

Parallel Plate Plasma Etching for MEMS Processing-Reactor Modelling

Babarada F., Dunare C., Profirescu M., University Politehnica Bucharest, RO

The model presented analyses the uniformity of dry etching polyslicon films which are used in resonator cavity for MEMS fabrication/1,2/. The increase of the uniformity is very important for nanotechnology and very strong required of [...]

TCAD Modeling using a Neural Network Based Approach

Matei R., Dima G., Profirescu M.D., University Politehnica of Bucharest, RO

This paper presents system level modelling and simulations results of two closed loop, force-feedback control strategies for micromachined tunnelling accelerometers. The first approach is based on the incorporation of the sensing element in a sigma-delta [...]

A Mathematical Model for the Threshold Voltage of a Partially and Fully Depleted MOS/SOI Structure with a Gaussian Distribution in the Film

Ravariu C., Ravariu F., Rusu A., Dobrescu D., Dobrescu L., Dobrescu D., Dobrescu L., Ravariu C., Ravariu F., Codreanu C., Avram M., University of Bucharest, RO

The analytical models for the electric field and potential distributions are necessary to establish the inversion or accumulation conditions at the front and back interfaces for a lot of SOI devices. The paper refers to [...]

Modeling of the Piezoelectric Micropump for Imporving the Working Parameters

Nedelcu O.T., Moagar-Poladian V., IMT-Bucharest, RO

In this paper a modeling for the flow of viscous liquids and a way to improve the piezoelectric micropump efficiency are described, in order to find the most convenient set of hydraulic parameters. The main [...]