Medical imaging technique using curvelet transform and machine learning for the automated diagnosis of breast cancer from thermal image

Pattern Analysis and Applications - Thermography is a useful imaging tool using infrared for the early diagnosis of breast cancer. Screening cancer aims to outstrip prognosis by seeing the...     

Biomimetic Multienzyme Complexes Based on Nanoscale Platforms

Inspired by the widely present multienzyme complexes in nature that enable highly cooperative catalytic mechanisms, we designed a biomimetic dual‐functionalized nanoparticle‐based platform for colocalizing multiple enzymes. The use of nanoscale materials together with a novel sequential colocalization approach with two model enzymes [glucose oxidase (GOX) and horseradish peroxidase] resulted in a 100% increase in the overall conversion rate compared to the equivalent amount of free enzymes in solution and a physical mixture of individual immobilized enzymes on nanoparticles. GOX is an important enzyme used in glucose biosensors for diagnostics. Colocalizing GOX with peroxidase allows for colorimetric visualization of the peroxide formed that enables monitoring glucose levels in solution. This platform can be readily applicable to other multienzyme systems as well. © 2012 American Institute of Chemical Engineers AIChE J, 59: 355–360, 2013     

Corrosion of carbon steel feeders during dilute chemical decontamination of primary heat transport system of PHWRs

Carbon steel feeders in the primary heat transport system of pressurized heavy water reactors (PHWRs) show significant wall thinning due to flow accelerated corrosion (FAC). This is of great concern, as the wear rate in certain locations exceeds the corrosion allowance by design. This necessitates periodic measurement of wall thickness and in some cases even mid course enmasse replacement of feeders. While analyzing the data on wall thicknesses and in arriving at the wall thinning rate during operation of the reactor, sufficient care has to be taken to account for the wall thinning occurring during full system chemical decontamination campaign which is carried out occasionally to reduce dose rates during reactor shut down. Chemical decontamination of primary heat transport system is carried out using a mixture of organic acids at a total concentration of about 0.1 g/L and at 85 °C. The results of experiments carried out under simulated conditions for estimating the wall thinning occurring in carbon steel feeder elbow during dilute chemical decontamination are described in this work. The corrosion rates are quantified.     

Application Note a Basic Program for the Transfer of Electrochemical Data From a Digital Oscilloscope To a Personal Computer Through Gpib Interface.

Introduction

The understanding of reaction mechanism on electrode surfaces requires fast perturbation techniques. One such elegant method is cyclic voltammetry where a dc voltage ramp is applied on a working electrode and the current so produced is monitored. This current reflects the electron transfer process and is controlled by the chemical reactions that take place before or after the electrode process. Scan rates of the order of 200 mV/s or higher can not be recorded on a conventional fast X-Y recorder due to inertia problems. It is customary to use oscilloscopes with memory in order to record the current and voltage signals. The advanced features of digital oscilloscope enhanced this data aquisition process and are amenable for use with computers. The software developed in BASIC language makes it possible to transfer the data aquired by the oscilloscope to the disk storage of the IBM PC.     

A generalized Doppler power spectrum for wireless environments

We provide a direct derivation of a generalized Doppler power spectrum of the signal received by a mobile station traveling at a constant velocity. The derivation uses the three-dimensional (3-D) incident radiation intensity and the receiving antenna pattern to obtain an expression for the generalized power spectrum which is useful in environments where the 3-D propagation characteristics of wireless signals must be taken into consideration. A special case of radiation confined to a plane is considered to obtain the power spectrum given in the book written by Jakes (1974)     

Ab initio based rate theory model of radiation induced amorphization in β-SiC

An ab initio informed rate theory framework for a multicomponent system is developed and used to model radiation induced amorphization in β-SiC. Based on the published modeling and experimental studies we propose three possible energy landscapes (ELs) for defect recombination in SiC. We demonstrate that defect ELs have a dramatic effect on the shape of the dose to amorphization vs. temperature curve and on the critical temperature to amorphization T_cr. In the no-barrier EL model, T_cr is correlated with the mobility of silicon interstitials, while in the recombination and trapping models T_cr is governed by the rate of defect recombination. We conclude that both the defect migration barrier and the defect recombination barrier are key parameters to consider when modeling radiation resistance of SiC, and possibly of other multi-component covalent materials.