Synchronization Limits of Chaotic Circuits

Through system modeling with electronic circuits, two circuits were constructed that exhibit chaos over a wide ranges of initial conditions. The two circuits were one that modeled an algebraically simple “jerk” function and a resistor-inductor-diode (RLD) circuit where the diode was reverse-biased on the positive voltage cycle of the alternating current source. Using simulation data from other experiments, the waveforms, bifurcation plots, and phase space plots of the concrete circuit were verified. Identical circuits were then built containing variable components and coupled to their original, matching circuits. The variable components were used to observe a wide range of conditions to establish the desynchronization parameters and the range of synchronization

Enlightenment and virginity

This paper attempts to demystify the vexed question of female virginity using the light of reason and a sceptical, feminist viewpoint. Starting with a historical and cultural survey of beliefs about virginity, it goes on to ask the ontological question What is virginity? In the process of answering this question, it examines biological, historical, psychosexual and cultural evidence to reach the con clusion that virginity does not really exist, since it cannot – at least, in the contemporary world – be defined or measured. Virginity is still idealised in many communities because male hegemony persists; a belief in the importance of virginity is a measure of social control of women. Fortunately for many women, however, it has always been and still is possible to fake virginity, in the twenty-first century as in all previous ages. Keywords: Feminism, virginity, enlightenment, cultural practice

A Spin-Orbit Alignment for the Hot Jupiter HATS-3b

We have measured the alignment between the orbit of HATS-3b (a recently discovered, slightly inflated Hot Jupiter) and the spin-axis of its host star. Data were obtained using the CYCLOPS2 optical-fiber bundle and its simultaneous calibration system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The sky-projected spin-orbit angle of $\lambda = 3\pm25^{\circ}$ was determined from spectroscopic measurements of Rossiter-McLaughlin effect. This is the first exoplanet discovered through the HATSouth transit survey to have its spin-orbit angle measured. Our results indicate that the orbital plane of HATS-3b is consistent with being aligned to the spin axis of its host star. The low obliquity of the HATS-3 system, which has a relatively hot mid F-type host star, agrees with the general trend observed for Hot Jupiter host stars with effective temperatures $>6250$K to have randomly distributed spin-orbit angles.Comment: 13 pages. Accepted for publication in the Astrophysical Journa

The Noblest Cause of All : The Moral Turn in American Libertarianism

A study of the \u27moral\u27 libertarianism which emerged in America during the 1960\u27s and 1970\u27s, and exploring the intellectual history and possible theoretical implications of the moral libertarianism

Recent Advances in Ultrasonic Imaging

Ultrasonics has been used for many years to detect flaws in materials by means of a pulse echo or A-scan technique. Ultrasonic images are formed by displaying the echoes in a two dimensional pattern so that t he spatial relationships between the interfaces and acoustic impedance discontinuities t hat give rise to the echoes are maintained. When the echo data is arranged in this way, it is possible for one\u27s eye and brain to serve as a very sophisticated pattern recognition system to detect flaws or defects within an object. This capability is particularly important when one is examining an object that normally has a considerable amount of internal structure. Since most of my experience is with medical applications, I will take the human abdominal region as an example. An ultrasonic image will be able to delineate the more or less known outlines of these normal internal structures. Frequently, however, the purpose of such an examination is to look for some abnormality such as a tumor or cyst and using an ultrasonic image these structures can be differentiated from the normal structures by those who have been trained in this sort of procedure. This can be done because the operator has learned to recognize certain patterns and he is able to employ his eye-brain pattern recognition system when the echo data is presented in the form of an image