This paper proposes and validates a novel simulation for thermal non-destructive characterization. An electro-thermal modelling of the sample is adapted for MATLAB-SIMULINK simulation. Though the technique is capable of considering any heat stimuli on an arbitrary sample, the special case of lock-in thermography (LT) with periodic heating is taken up for illustration. A mild-steel sample having...

Two-phase locking is a standard method for managing concurrent transactions in database systems. In order to guarantee good recovery properties, two-phase locking should be strict, meaning that locks can be released only after the transaction's commit or abort. In this paper we show that even exclusive locks can be released immediately after the commit request has arrived, without sacriicing an...

The kinetics of thermal inactivation of copper-containing amine oxidase from lentil seedlings were studied in a 100 mM potassium phosphate buffer, pH 7, using putrescine as the substrate. The temperature range was between 47-60 degrees C. The thermal inactivation curves were not linear at 52 and 57 degrees C; three linear phases were shown. The first phase gave some information about the number...

Some microorganisms, such as spermatozoa, synchronize their flagella when swimming in close proximity. Using a simplified model (two infinite, parallel, two-dimensional waving sheets), we show that phase locking arises from hydrodynamics forces alone, and has its origin in the front-back asymmetry of the geometry of their flagellar waveform. The time evolution of the phase difference between co...

Phase-locked loop (PLL) frequency synthesizers used for high-speed data transmission must rapidly hop and lock to new frequencies. The fundamental problem is that the settling time depends inversely on the loop bandwidth, and increasing the bandwidth causes unwanted noise interference and stability problems for the circuit. We demonstrate the feasibility of replacing the analog integrator in th...

A number theoretical model of 1/f noise found in phase locked loops is developed. Oscillators from the input of the non linear and low pass filtering stage are shown to lock their frequencies from continued fraction expansions of their frequency ratio, and to lock their phases from modular functions found in the hyperbolic geometry of the half plane. A cornerstone of the analysis is the Ramanuj...

Cascaded cryptographic keystream generators as proposed by Gollmann possess a cryptanalytic weakness termed "lock-in'' in this article. If the initial state has been guessed correctly apart from its phase a decryption cascade can be set up in which the effects of each stage of the original cascade are unravelled in reverse order. Once the decryption cascade has "locked in" on the original casca...