Notes on magnetohydrodynamics, part ii

Simple waves and covariant formulation related to magnetohydrodynamics and derivation of equations for one-dimensional wave propagation and Riemann invariants for fast and slow wave

Comparing Information-Theoretic Measures of Complexity in Boltzmann Machines

In the past three decades, many theoretical measures of complexity have been proposed to help understand complex systems. In this work, for the first time, we place these measures on a level playing field, to explore the qualitative similarities and differences between them, and their shortcomings. Specifically, using the Boltzmann machine architecture (a fully connected recurrent neural network) with uniformly distributed weights as our model of study, we numerically measure how complexity changes as a function of network dynamics and network parameters. We apply an extension of one such information-theoretic measure of complexity to understand incremental Hebbian learning in Hopfield networks, a fully recurrent architecture model of autoassociative memory. In the course of Hebbian learning, the total information flow reflects a natural upward trend in complexity as the network attempts to learn more and more patterns.Comment: 16 pages, 7 figures; Appears in Entropy, Special Issue "Information Geometry II

A path analysis of the relationship between job stress and care for ageing parents in Thailand: a case study of Thai migrant workers

This study examines internal labour migration in Thailand to study the stress level of workers who have to care of and look after their ageing parents. A cross-sectional survey was administered to 300 Thai migrant labourers who continuously have to attend to their ageing parents. Thai Job Content Questionnaire (Thai-JCQ) was used to gather information on job stress level using the Job Demand Control (JDC) model developed by Karasek. Findings show that distance, wages, and working conditions have a direct effect on job stress. Wages had the most direct relationship with job stress with a standardised regression weight of 0.400 (p-value<0.01). In conclusion, distance, wages, and working conditions, each directly impacts job stress. However, caring for ageing parents is a mediator and a moderator of job stress levels

Simple Syllabic Calls Accompany Discrete Behavior Patterns in Captive Pteronotus parnellii: An Illustration of the Motivation-Structure Hypothesis

Mustached bats, Pteronotus parnellii, are highly social and vocal. Individuals of this species roost in tight clusters, and emit an acoustically rich repertoire of calls whose behavioral significance is largely unknown. We recorded their social and vocal behaviors within a colony housed under semi-natural conditions. We also quantified the spatial spread of each bat's roosting location and discovered that this was relatively fixed and roughly confined to an individual's body width. The spatial precision in roosting was accompanied by an equally remarkable match between specific vocalizations and well-timed, discrete, identifiable postures/behaviors, as revealed by logistic regression analysis. The bodily behaviors included crouching, marking, yawning, nipping, flicking, fighting, kissing, inspecting, and fly-bys. Two echolocation-like calls were used to maintain spacing in the colony, two noisy broadband calls were emitted during fights, two tonal calls conveyed fear, and another tonal call signaled appeasement. Overall, the results establish that mustached bats exhibit complex social interactions common to other social mammals. The correspondence of relatively low frequency and noisy, broadband calls with aggression, and of tonal, high frequency calls with fear supports Morton's Motivation-Structure hypothesis, and establishes a link between motivation and the acoustic structure of social calls emitted by mustached bats

Charmonium spectrum in an unquenched quark model

The effects of virtual light quark pairs on the charmonium spectrum are studied. Pair creation is modelled with a ``$^{3}P_{0}$" vertex and intermediate states are summed up to 2S excitations. Quark model parameters are obtained by fitting to 12 well-known charmonium states, allowing for feedback between the decaying particle and the induced mass shifts. Both of these technical steps are new and improve agreement with the experimental spectrum. In general, the masses receive small shifts once model parameters are refit. This is true in almost cases except the $\chi_{cJ}(2P)$ multiplet, which experiences upwards mass shifts of order 150 MeV, has the ordering of the multiplet rearranged, and pushes the erstwhile $c\bar{c}$ ${2}^3P_1$ state well above $D^*\bar{D}$ threshold--observations that clarify the nature of the enigmatic $X(3872)

SATL Based Lesson for Teaching Grignard Reagents in Synthetic Organic Chemistry

Synthesizing new products from raw materials has been very popular aspects of research in organic chemistry. Traditionally, Grignard reagent has been very vital component of such synthetic procedures. Hence learning of various issues concerning with applications of Grignard reactions in synthetic organic chemistry is vital for enhancing the students creative capability. In this paper we will illustrate the uses of SATL methodology, which is recently getting popular [1- 3], in an SATL-based model lesson concerning teaching and learning of synthetic organic reactions related to Grignard reagents

Ariel - Volume 8 Number 5

Executive Editor James W. Lockard. Jr. Business Manager Neeraj K. Kanwal University News Martin Trichtinger World News Doug Hiller Opinions Elizabeth A. McGuire Features Patrick P. Sokas Sports Desk Shahab S. Minassian Managing Editor Edward H. Jasper Managing Associate Brenda Peterson Photography Editor Robert D. Lehman, Jr. Graphics Christine M. Kuhnl

Impact of performance management system on organisational performance of higher education institutions : a case study of Pakistan

Higher education institutions (HEIs) are constantly striving for better quality and effectiveness with a paucity of resources, while simultaneously expected to exhibit greater transparency and accountability in their procedures. Academic institutions are facing challenges of restricted funding and severe competition in the current dynamic environment which is creating the need for more effective and efficient utilization of human capital in possession. This study explores the impact of implementation of Performance Management (PMS) on organisational performance in Higher Education Institutions (HEI) of Pakistan. Several reasons make this sector particularly important for this examination: Firstly, Pakistan is a developing economy and in severe need of highly skilled manpower to develop a strong economy. Higher education institutions play pivotal role in this human development. Thus, effectiveness of performance of faculty members of these institutions is very important. Secondly, the implementation of performance management systems is likely to be one of the revolutionary changes in HEIs. Finally, the uses of PMS in HEIs will provide us with a better understanding of its impact on organisational performance. Therefore, this study aimed to explore the impact of Performance management System in HEIs, and how this use of PMS contributes to the employees’ performance and Organisational Performance. An interpretive approach is used to answer research questions and to explore the implementation of PMS in depth by using qualitative data collection methods. The data subjects were faculty members from business schools of the chosen HEIs. A thematic analysis has been done with the help of NVivo software to analyse the semi-structured interviews. This research contributes to the body of knowledge in relation to the impact of performance management system on the organisational perfroamnce of HEIs in general and more specifically in context of Pakistan. Findings of this research has highlighted the critical issues regarding how performance is managed, evaluated and reported by the HEIs in order to control and organize the dynamics that influence the output of HEIs in Pakistan. Moreover, this study contributed that organisational culture have strong influence on the implementation of PMS in higher education institutions in Pakistan