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OPEN COURSEWARE: A NEW PARADIGM IN E-LEARNING
No full textHistory has proved that education and discovery are best advanced when knowledge is
shared openly. Open Courseware (OCW) is a part of a comparatively new educational
movement in the line of Open access and also an opportunity in the field of distance/elearning
that leading institutions and universities around the world can capitalize for the
betterment of the society. Great Universities and institutions constantly expand their
reach, working across traditional boundaries to grasp and meet the global community’s
most critical needs. Already world famous institutes like Massachusetts Institute of Technology
(MIT), all Indian Institute of Technologies (IITs) and Indian Institute of Science
(IISc) are working along this way that will automatically inspire other institutions to
openly share their course materials for open dissemination of knowledge and information
that can open new doors to the benefits of education for humanity around the
world. India is a vast country with different culture and languages. In this paper we
studied different aspects of OCW and its impact on total learning proce
Open Courseware: A Unique Opportunity for India
No full textThe pivotal role of education as an instrument of social change - by altering the human
perspective and transforming the traditional mindset of society is well recognized. The
universalisation of education has become the top priority, especially for the developing countries.
But the extension of quality education to remote and rural regions becomes a Herculean task
for a large country like India with multi-lingual and multi-cultural population separated by vast
geographical distances, and, in many instances, inaccessible terrain. Open Courseware (OCW)
is part of a comparatively new educational movement in the line of Open Access (OA) and
leading institutions and universities around the world are capitalizing it for the betterment of
the society. OCW provides learners an opportunity to disseminate knowledge beyond the
traditional classroom environment. The present study aims to spread the word of OCW and
sensitize the teachers and learners about the tremendous potential of OCW in the context of
education in Indi
Study of indoor radon and thoron progeny levels in surrounding areas of Nalbari, Assam, India
No full textWith the growing understanding of the role of radon and its daughter products as major sources
of radiation exposure, the importance of large number of estimation of radon concentration in various parts of the
country is realized. Inhalation of radon, thoron and their decay products is the major source of the total radioactive
dose received by the human population from natural radiation. The indoor radon and thoron progeny levels in
Nalbari area of Assam are studied by using the LR-115 (type II) Solid State Nuclear Track Detector in Plastic Twin
Chamber dosimeter. Radon and thoron progeny levels in different types of dwellings for one full calendar year
are presented in this paper. For Assam Type (A.T.) houses, indoor radon progeny concentrations vary from 0.17
to 0.64 mWL with an annual geometric mean of 0.27 mWL and that for Reinforced Cement Concrete (R.C.C.)
houses vary from 0.22 mWL to 0.60 mWL with the annual geometric mean of 0.37 mWL. The thoron progeny
levels in A.T. houses also vary from 0.01 to of 0.05 mWL with an annual geometric mean of 0.02 mWL and that
for R.C.C. houses vary from 0.02 to 0.08 mWL with the annual geometric mean of 0.04 mWL.P C Deka1*, H Sarma2, Subir Sarkar3, T D Goswami4 and B K Sarma4
1Department of Physics, Rangia College, Rangia-781 354, Assam, India
2Department of Physics, B B K College, Nagaon, Barpeta-781 309, Assam, India
3Department of Physics, Nowgong College, Nagaon-782 001, Assam, India
4Department of Physics, Gauhati University, Guwahati-781 014, Assam, India
E-mail : [email protected] of Physics, Rangia College, Rangia-781 354, Assam, India
Department of Physics, B B K College, Nagaon, Barpeta-781 309, Assam, India
Department of Physics, Nowgong College, Nagaon-782 001, Assam, India
Department of Physics, Gauhati University, Guwahati-781 014, Assam, Indi
Fundamental understanding and modeling of spin coating process : A review
No full textA mathematical model is derived to elucidate the dominant mechanism
governing film formation. It leads to a relation between film thickness and film
radius spreading with time. Inclusion of evaporation and shear stress was made with
extension to non-Newtonian fluid. The advantages and disadvantages of this process
with applications are reviewed.Niranjan Sahu*, B Parija and S Panigrahi
Department of Physics, National Institute of Technology, Rourkela-769 008, Orissa,
India
E-mail : [email protected] of Physics, National Institute of Technology, Rourkela-769 008, Orissa,
Indi
Structural and magnetic properties of Fe doped NiO
No full textMott-Hubbard anti-ferromagnetic insulator, NiO shows p-type
semiconducting behaviour due to vacancy at Ni2+ site in its bunsenite structure. We
report the modification of structural and magnetic order in NiO on Fe doping. NiO
samples at different Fe concentrations in the range 0 to 5 at.% have been prepared
by chemical co-precipitation and post thermal decomposition method. Both structural
and magnetic characterization reveal that with increasing Fe doping concentration,
NiO evolves as a magnetically inhomogeneous state out of the parent homogeneous
antiferromagnetic state. In addition, structural inhomogeneity was also observed
with Fe precipitating to .-Fe2O3 phase, the signature of which could be clearly seen
for Fe content beyond 2 at.%. At lower Fe content however, some amount of Fe
occupies lattice and interstitial sites in the NiO matrix and drive the latter to
acquire ferromagnetic ordering, which was evident from a clear hysteresis loop at
300 K.Structural and magnetic properties of Fe doped NiO
P Mallick1*, Chandana Rath2, R Biswal3 and N C Mishra3
1Department of Physics, North Orissa University, Baripada-757 003, Orissa, India
2School of Material Science & Technology, Institute of Technology,
Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
3Department of Physics, Utkal University, Bhubaneswar-751 004, Orissa, India
Email : [email protected] of Physics, North Orissa University, Baripada-757 003, Orissa, India
2School of Material Science & Technology, Institute of Technology,
Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
3Department of Physics, Utkal University, Bhubaneswar-751 004, Orissa, Indi
Effect of heavy cation doping on thermal properties of LaMnO3
No full textEffect of heavy cation doping (Ca2+ at the A-site) on the thermal
properties of perovskite LaMnO3 has been investigated using the Rigid Ion Model
(RIM)). As strong electron-phonon interactions are present in these compounds, the
lattice part of the specific heat deserves proper attention. The specific heat of
magnetoresistance compound La0.25Ca0.75MnO3 as a function of temperature (10 K =T=
300 K) is reported. Our results on specific heat are in good agreement with the
measured values of specific heat at lower temperatures. In addition, the results on
the cohesive energy (f), molecular force constant (f ), Restrahalen frequency (.0),
Debye temperature (TD) and Gruneisen parameter (.) are also discussed.Effect of heavy cation doping on thermal properties of
LaMnO3
Archana Srivastava2*, N K Gaur1 and Purvee Bhardwaj1
1Department of Physics, Barkatullah University, Bhopal-462 026, Madhya Pradesh, India
2Department of Physics, Sri Sathya Sai College for Women, Bhopal-462 024, Madhya
Pradesh, India
Email : [email protected] of Physics, Barkatullah University, Bhopal-462 026, Madhya Pradesh, India
2Department of Physics, Sri Sathya Sai College for Women, Bhopal-462 024, Madhya
Pradesh, Indi
Analysis on air suspended particles of Coimbatore – a FTIR study
No full textAn infrared absorption method has been used to identify the minerals in
dust collected from some parts of Coimbatore, Coimbatore district, Tamil Nadu
without grinding. The KBr pellet technique was employed. The results obtained from
the IR spectra show the presence of quartz, asbestos, kaolinite, calcite, haematite,
montmorllonite, nacrite and coal. The hazardous effect of inhalation of these
minerals are explained. The results show Pollachi main road is more contaminated
with hazardous minerals.Analysis on air suspended particles of Coimbatore – a FTIR study
V Ramasamya* and V Ponnusamyb
aDepartment of Physics, Annamalai University, Annamalai Nagar-608 002, India
bDepartment of Physics, Faculty of Engineering and Technology, Annamalai University,
Annamalai Nagar-608 002, India
E-mail : [email protected] of Physics, Annamalai University, Annamalai Nagar-608 002, India
bDepartment of Physics, Faculty of Engineering and Technology, Annamalai University,
Annamalai Nagar-608 002, Indi
Manojkanti Banerjee (Born : 25 May, 1930 – Died : 18 February, 2006)
No full textBiography of Manojkanti BanerjeeAuthor's Affiliation: Formerly of SINP, Kolkata - 700064, India. E-Mail: [email protected] Institute of Nuclear Physic
Effect of thermal annealing on optical properties of CR-39 polymeric track detector
No full textThe samples of CR-39 polymer (TASTRAK, Bristol, England) were annealled thermally at various
temperatures ranging from 100oC to 180oC for 1 hour, in air. FTIR spectroscopy reveals the structural degradation
of CR-39 polymer due to thermal annealing above its glass transition temperature. Optical band gap of pristine
and thermally annealed samples has been determined using UV-Visible absorption spectra. It has been observed
that the optical band gap decreases continuously as a result of annealing.Department of Physics, Kurukshetra University,Kurukshetra-136 119, Haryana, Indi
Mapping the inhomogeneity of the U and Th distributions –using sample size concept in the field conditions
No full textIndigenously fabricated portable gamma-ray spectrometer (PGRS) is used for the measurement
of gamma activity of 214Bi (1.76 MeV) and 208TI (2.62 MeV), under field conditions in Mohar area, Shivpuri Distt.
(MP). The energies are discriminated by using a Nal (TI) crystal of size 1.75" × 2". PGRS used to map the
primordial elemental distributions shows reversals of concentration of thorium and uranium (represented by
radium group) in field and lab analysis in many samples, which is attributed to the inhomogenity of distribution of
these elements in the area. The concept of difference in the volume of dish shaped field sample and the randomly
picked up sample from the field grid point (400 gm in lab analysis) is utilized to interpret the inhomogenity of these
elements. However interpretations are based on the assumption that these primordial elements (U, Th) are in
secular equilibrium and the terrain has low topographic relief.Madhulika Pathak, Shaibal Gupta, Debashis Bhattacharya,
M K Rao and B K Bhaumik*
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy,
West Block VII, R K Puram, New Delhi-110 066, India
E-mail : [email protected] Minerals Directorate for Exploration and Research, Department of Atomic Energy,
West Block VII, R K Puram, New Delhi-110 066, Indi