Browsing by Issue Date
Now showing items 1-20 of 2418
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Induced Desorption of DDT, DDD, and DDE from a Contaminated Sediment
(1997-03-01)Release profiles of p,p′-DDT, p,p′-DDD, and p,p′-DDE from sediment collected from Indian Creek, Alabama, were measured with a gas purge-induced desorption technique and compared to a model developed in this work. DDT entered ... -
Modeling Short-Term Soil−Water Distribution of Aromatic Amines
(1998-08-12)The applicability of a distributed parameter model for describing the distribution of aniline and α-naphthylamine between soil and aqueous phases at short contact times was assessed. Mass action equations considered in the ... -
Novel tuneable filter based on MZ and an amplified ring resonator for OFDM networks
(1999-11-08)A novel reconfigurable fibre based tuneable filter is proposed. The module relies on a cascaded connection of Mach-Zehnders and an amplified fibre ring resonator. MHz range adjustable FHWM bandwidths and high crosstalk are ... -
New optical filter employing multireflection mirror to provide design flexibility for WDMA
(2000)A novel optical device employing an amplified ring resonator and a multireflecting mirror inside, is presented. Is founded its transfer function. Also simple expressions for the separation of the two maximums of this novel ... -
Modeling Abiotic Processes of Aniline in Water-Saturated Soils
(2000-03-18)The long-term interactions of aromatic amines with soils are important in defining the fate and transport of these compounds in the environment. Abiotic loss of aniline from the aqueous phase to the soil phase occurs with ... -
Design and tolerance analysis of a router with an amplified resonator and Bragg gratings
(2000-04-20)A novel ring resonator configuration with Bragg gratings is presented. The stability of this configuration is studied by a z-transform technique. A router design with a FWHM of 17 MHz, a -40-dB rejection ratio, and a 15-dB ... -
Remoção de íons de metais pesados com bentonitas modificadas
(2001)O presente trabalho apresenta o desenvolvimento de um material sorvente a partir de bentonitas brasileiras modificadas quimicamente com o objetivo de aumentar sua capacidade de sorção de metais pesados e seu valor agregado. ... -
Modeling Competitive Cation Exchange of Aromatic Amines in Water-Saturated Soils
(2001-06-01)Competitive association to several components of soil through ion exchange processes influences the fate of organic cations in the environment. To examine these processes, the distributions of aniline and 1-aminonaphthalene ... -
Role of pH in partitioning and cation exchange of aromatic amines on water-saturated soils
(2001-08-04)Predicting the reversible interactions between aromatic amines and soil is essential for assessing the mobility, bioavailability and exposure from contaminated sites. Reversible sorption mechanisms of aniline and α-naphthylamine ... -
Novel tunable optical filter employing a fiber loop mirror for synthesis applications in WDM
(2001-11-12)A novel optical filter employing a fiber loop mirror within an amplified ring resonator is presented. The fiber loop mirror allows tuning by changing the coupling factor of a coupler. The device can be used as a building ... -
Wide tunable filters using a recirculating delay line with multi-reflections
(2002-05-01)A ring resonator with multiple reflections as a tunable filter is proposed and analyzed in this paper. A coupler and two identical Bragg gratings are used to implement the internal reflections so an active filter with a ... -
Measurements on passive tunable optical filters for DWDM
(2002-06-06)Measurements on a passive optical fibre tunable filter are presented. The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a coupler. The novel ... -
A diagnostic investigation and a corrective model for implementing change in response to innovation
(2002-12-01)Organizational change can be described as a series of activities oriented towards modifying behaviors and structures within the organization. These series of activities are interconnected internally and externally and are ... -
Seismic Response of Single-Degree-of-Freedom Systems with Structural Fuses
(2003)Passive energy dissipation (PED) devices have been implemented to enhance structural performance by reducing seismically induced structural damage. In this article, metallic dampers are defined to be structural fuses (SF) ... -
Study of The Corrosion Products Formed on Carbon Steels in The Tropical Atmosphere of Panama
(2003)Mössbauer spectroscopy and X-ray powder diffraction (in selected samples) have been used to characterize corrosion products on carbon steels after atmospheric exposure to the tropical Panamanian locations of Panama and ... -
Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite
(2003-02-01)The grafting, by chemical adsorption, of molecular 1.10-phenanthroline (OP) onto some Brazilian bentonite (montmorillonites) was studied to improve their adsorptive capacities to remove Cu ions from synthetic wastewater. ... -
Vertical Movement of Resonance Hopping Robot with Electric Drive and Simple Control System
(2003-06-01)In the paper vertical movements of resonance hopping robot with one leg and electric drive are considered. Special construction of hopping robot with compensation of losses during flight of the robot allows to employ a ... -
Tunable optical filters using compound ring resonators for DWDM
(2003-07-28)The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the ... -
Optical router for optical fiber sensor networks based on a liquid crystal cell
(2003-09-04)Optical fiber sensor networks are evolving rapidly. They are used because of the inert nature of optical fibers allowing no electromagnetic interference and safe applications in inflammable atmospheres; other relevant ... -
Advances in the adsorptive particulate flotation process
(2003-09-18)The removal of contaminants from liquid effluents by the adsorptive particulate flotation (APF) process, including new adsorbents and flotation devices, are reported. Herein, contaminants are adsorbed (and/or absorbed) ...