A Cross Cultural Virtual Learning Environment for Students to Explore the Issue of Racism: A Case Study involving the UK, USA & SA

This article draws upon the experiences of three academics who collaborated online to engage students from the three respective higher education institutions (the University of Wales, United Kingdom; the University of Washington, United States of America; and the University of KwaZulu Natal, South Africa) to participate in a Virtual Learning Environment using Blackboard software to examine the issue of racism (past and present). This article reflects upon the nature, context and format of the online learning environment, explores the staff and student experience of participating and engaging in the conference, and considers its effectiveness for learning and teaching. The article also highlights some of the cross cultural insights that emerged concerning language, culture, and social context in respect of the issue of racism and related issues of discrimination. The creation of a virtual learning environment across three continents raised interesting challenges and exciting opportunities in respect of academic collaboration and the development of learning and teaching strategies. The article concludes by suggesting that there is pedagogical merit in using both cross cultural and virtual learning environments which may be particularly well suited to enable students to grapple with subject matters that have historically been fraught with ignorance, prejudice and pre-conceived ideas

Evolution of crystalline electric field effects, superconductivity, and heavy fermion behavior in the specific heat of Pr(Os1−x_{1-x}Rux_x)4_4Sb12_{12}

Specific heat $C(T)$ measurements were made on single crystals of the superconducting filled skutterudite series Pr(Os$_{1-x}$Ru$_x$)$_4$Sb$_{12}$ down to 0.6 K. Crystalline electric field fits in the normal state produced parameters which were in agreement with previous measurements. Bulk superconductivity was observed for all values of the Ru concentration $x$ with transition temperatures consistent with previous experiments, confirming a minimum in $T_{c}$ at $x=0.6$. The $C(T)$ data below $T_{c}$ appear to be more consistent with power law behavior for $x=0$ (PrOs$_4$Sb$_{12}$), and with exponential behavior for $0.05 \leq x \leq 0.2$. An enhanced electronic specific heat coefficient $\gamma$ was observed for $x \leq 0.4$, further supporting $x \simeq 0.6$ as a critical concentration where the physical properties abruptly change. Significant enhancement of $\Delta C/T_{c}$ above the weak coupling value was only observed for $x=0$ and $x=0.05$.Comment: 16 pages, 5 figures, submitted to Physical Review B. v2: text added and figures modifie

Magnetic Behavior in RRhX (R = rare earths; X=B, C) Compounds

We report on the magnetic behavior of RRhB (R = La, Ce, Pr, Nd, Gd, Tb and Tm) and RRhC (R = La, Ce, Pr and Gd) compounds crystallizing in the cubic perovskite type structure with space group Pm3m. The heat capacity data on Pauli-paramagnetic LaRhB and LaRhC indicate a high frequency vibrating motion of boron and carbon atoms in the unit cell. Ce is in -like nonmagnetic state in both the compounds. Pr compounds show a dominant crystal field effect with a nonmagnetic singlet ground state in PrRhB and a nonmagnetic quadrupolar doublet in PrRhC. Compounds with other rare earths order ferromagnetically at low temperatures except TmRhB in which the zero field evolution of magnetic interactions is relatively more complicated. The electrical resistivity of GdRhB decreases with increasing temperature in the paramagnetic state in the vicinity of T, which is rarely seen in ferromagnets. The behavior is discussed to be arising due to the short range spin fluctuation and a possible contribution from Fermi surface geometry.Comment: 14 Figs and a text fil

A comparative study of rapid urease test and dilute carbol fuchsin staining technique for diagnosis of Helicobacter pylori infection

Background: Helicobacter pylori (H.pylori) is a gram negative spiral bacilli associated with acid peptic disease (APD) and gastric carcinoma. A rapid urease test is the most common test performed for a quick clinical diagnosis with or without histopathological examination of antral biopsy specimens.Methods: In this study we evaluated the utility of a simple dilute carbol fuchsin stain (DCF) for identifying the spiral or curved forms of H.pylori in the direct smears of antral biopsy samples for diagnosis of H.pylori infection and compared the results with rapid urease test (RUT).Results: Sums of 100 cases were included in the study from which 61 (61%) were positive for urease production and shown typical spiral or curved bacilli by D.C.F stain.Conclusions: DCF stain was found to be an excellent stain for direct microscopic evaluation and compared well with RUT

Free volume study of poly(chlorotrifluoroethylene) using positron annihilation spectroscopy as a microanalytical tool

Positron lifetimes and X-ray diffraction measurements were carried out on poly(chlorotrifluoroethylene) films annealed between 25 and 215 degrees C. The positron lifetime results were used to determine the free volume and XRD data were used to determine the apparent crystallite size and crystallinity. The glass transition temperature (T-g) of 52 degrees C obtained from positron results is in agreement with that obtained by thermal analysis. The average free volume cell size is 74 Angstrom(3) in films annealed below T-g, and increases to 84 Angstrom(3) in samples annealed above T-g. Although the observed changes in positron lifetime parameters as a function of annealing temperature are small, they are significant for the kind of material investigated. Our observations are explained in terms of thermally activated chain mobility, local relaxations and long-range motions. We further estimate, for the first time, the activation energies in the amorphous and crystalline regions of the polymer using the Goldanskii kinetic relations. Copyright (C) 1996 Elsevier Science Ltd

Prevalence of HIV seropositivity among the patients attending tertiary care hospital at Puducherry, India

Background: HIV/AIDS has been globally increasing since its first identification and reached 36.9 million by the end of 2014. It is more prevalent in underdeveloped countries. India with about 2.1 million HIV/AIDS affected people is placed third on the table followed by South Africa and Nigeria. In the present study, we aim to report the prevalence of HIV/AIDS among the patients attending our hospital in and around Puducherry, India.Methods: A total of 18903 patients attending various departments of our hospital from November 2012 to October 2015 were included in this study. HIV screening was done by rapid card test and ELISA for the detection of antibodies against HIV.Results: Out of the total study population, 259 (1.37%) were positive for HIV/AIDS. An increasing prevalence was observed in each successive year of our study. Male (1.94%) population was predominantly affected by HIV/AIDS than the females (0.90%) and is more prevalent in the 41-50 year age group.  Conclusions: Continuous monitoring, testing and counseling for HIV/AIDS would help to keep the disease under control. Special awareness and education programs are to be conducted in areas in which an increasing prevalence of HIV/AIDS is reported

Superconductivity mediated by a soft phonon mode: specific heat, resistivity, thermal expansion and magnetization of YB6

The superconductor YB6 has the second highest critical temperature Tc among the boride family MBn. We report measurements of the specific heat, resistivity, magnetic susceptibility and thermal expansion from 2 to 300 K, using a single crystal with Tc = 7.2 K. The superconducting gap is characteristic of medium-strong coupling. The specific heat, resistivity and expansivity curves are deconvolved to yield approximations of the phonon density of states, the spectral electron-phonon scattering function and the phonon density of states weighted by the frequency-dependent Grueneisen parameter respectively. Lattice vibrations extend to high frequencies >100 meV, but a dominant Einstein-like mode at ~8 meV, associated with the vibrations of yttrium ions in oversized boron cages, appears to provide most of the superconducting coupling and gives rise to an unusual temperature behavior of several observable quantities. A surface critical field Hc3 is also observed.Comment: 29 pages, 5 tables, 17 figures. Accepted for publication in Phys. Rev.

Effects of Storage Structures and Moisture Contents on Seed Quality Attributes of Quality Protein Maize

The study was aimed to examine the effects of various storage structures and moisture contents on seed quality attributes of quality protein maize seed. The quality protein maize (QPM-1) seed was tested in conventional seed storage containers (Fertilizer sack and earthen pot) and the improved hermetic ones (Metal bin, Super grain bag, and Purdue Improved Crop Storage (PICS) bag) at Seed Science and Technology Division, Khumaltar, Nepal during February, 2015 to January 2016. Ten treatments comprising 5 storage devices in two moisture regimes (11% and 9%) replicated thrice and laid out in Completely Randomized Design (CRD). Data on temperature, relative humidity (RH), germination, electrical conductivity (EC), seed moisture content (MC) were collected bimonthly. The conventional containers were found liable to the external environmental condition whereas the hermetic structures observed with controlled RH level below 40% in all combinations. Electrical conductivity (EC) for seed vigor showed that hermetic containers provide higher seed vigor than the conventional ones. Up to 4 months all treatments were found statistically at par for germination. A significant difference was observed in each treatment after 4 months where PICS bag & Super grain bag showed best germination followed by metal bin while fertilizer bag & earthen-pot showed poorer and poorest germination respectively till one year. Almost all treatments with lower MC showed better results than the treatments with higher MC. A negative correlation (R2=69.7%) was found between EC and Germination. All six figures from 2 to 12 months on MC showed statistically different where hermetic plastic bags were found maintaining MC as initial whereas MC of fertilizer bags and earthen pot was spiked than the basal figure. The finding evidenced that the hermetic containers and low MC are the seed storage approaches for retaining the quality of seed even in an ambient environmental condition for more than a year

Concert/C: A language for distributed programming

Concert/C is a new language for distributed C programming that extends ANSI C to support distribution and process dynamics. Concert/C provides the ability to create and terminate processes, connect them together, and communicate among them. It supports transparent remote function calls (RPC) and asynchronous messages. Interprocess communications interfaces are typed in Concert/C, and type correctness is checked at compile time wherever possible, otherwise at runtime. All C data types, including complex data structures containing pointers and aliases, can be transmitted in RPCs. Concert/C programs run on a heterogeneous set of machine architectures and operating systems and communicate over multiple RPC and messaging protocols. The current Concert/C implementation runs on AIX 3.2 1, SunOS 4.1, Solaris 2.2 and OS/2 2.1, and communicates over Sun RPC, OSF/DCE and UDP multicast. Several groups inside and outside IBM are actively using Concert/C, and it is available via anonymous ftp from software.watson.ibm.com:/pub/concert.