1,211 research outputs found
Online access to DRDO periodicals using open source software
Defence Scientific Information and Documentation Centre (DESIDOC) is a nodal centre for information communication and dissemination in the Defence Research & Development Organization (DRDO). As the publication wing of DRDO, DESIDOC brings out regular publications including Defence Science Journal, DESIDOC Bulletin of Information Technology, DRDO Newsletter, DRDO Samachar and Technology Focus. These periodicals cover a wide variety of topics in various subject areas targeting different user communities situated all over India. A pilot project was undertaken with an aim to provide online desktop access to the full text of these periodicals to the users including R&D scientists of more than 50 laboratories and establishments. The project also aimed at facilitating the Publications Division to directly upload the contents to the system. The open source software EPrints is used and customized according to the user requirements particularly on Intranet. Upon successful testing and evaluation, these periodicals will be hosted on Internet allowing subscription, access and downloading by users across the globe. This paper discusses the experience in using EPrints and customization at various levels for DRDO publications and explains various features of the model
Information technologies for libraries and information centres
For the past few years, the tremendous
strides taken in the fields of information
technologies have changed the society into an
information conscious society. There is little
doubt that the impact of these technologies on
the day-to-day functions of information centres
is an everlasting one. The innumerable
advances in different fields such as computers,
communi- cations, electronic mail, voice mail,
teletext, videotext, telefax, videodisc,
CD-ROM, electronic publishing, etc have left
no area in the library, and information field
immune for their application. And many areas
still remain undiscovered.
This paper, first in a series, makes an
attempt to overview the impact of the
information technologies on the library and
information services. A brief discussion of
electronic message and documentdelivery
systems,and electronic mail are also
presented
Modes of Parasitism between the Necrotrophic Fungus Botrytis cinerea and Trichoderma spp
This study aims to understand the differential antagonistic activity of the Trichoderma spp. against Botrytis cinerea (grey mould) on tomato plants. The antagonistic efficiency between Botrytis cinerea and Trichoderma spp. viz., Trichoderma reesei, Trichoderma viride, Trichoderma harzianum, Trichoderma hamatum, Trichoderma longibractum were studied in vitro using dual plate technique. The results revealed that all of the Trichoderma isolates had the ability to inhibit the mycelial growth of grey mould. The percentage reduction in the growth of B. cinerea after seven days of incubation at 23 ± 2ºC varied between 35-84%. The Trichoderma spp. such as T. reesei (A1) and T.harzianum (E1) showed the highest antagonistic activity (T. reesei (A1) – 84%; T. harzianum (E1) – 72.8%). SEM studies at cellular level have shown the collapse of hyphal wall of B. cinerea at an early stage. Clear evidence on direct parasitism was recorded on most of the Trichoderma spp. tested in this experiment. In bioassay experiments, B. cinerea applied alone was found throughout the leaf tissues in high densities after an incubation period of five days at 18°C in a moist chamber rather than when pathogen and antagonists were applied together. Based on previous records of Trichoderma spp., biocontrol potential and observations of its colonizing properties, it appears that T. reesei can compete and reduce the growth of B. cinerea in tomato plants at an early stage and enhance the growth of the plants. Keywords: Biological control, antagonistic potential, cell damage, grey mould, Trichoderma spp
Minimization of power loss in newfangled cascaded H-bridge multilevel inverter using in-phase disposition PWM and wavelet transform based fault diagnosis
AbstractNowadays multilevel inverters (MLIs) have been preferred over conventional two-level inverters due to reduced harmonic distortions, lower electromagnetic interference, and higher DC link voltages. However, the increased number of components, complex PWM control, voltage-balancing problem, and component failure in the circuit are some of the disadvantages. The topology suggested in this paper provides a DC voltage in the shape of a staircase that approximates the rectified shape of a commanded sinusoidal wave to the bridge inverter, which in turn alternates the polarity to produce an AC voltage with low total harmonic distortion and power loss. This topology requires fewer components and hence it leads to the reduction of overall cost and complexity particularly for higher output voltage levels. The component fault diagnostic algorithm is developed using wavelets transform tool. Finally an experimental prototype is developed and validated with the simulation results
Aerosol characteristics at a remote island: minicoy in southern Arabian sea
Extensive measurements of aerosol optical and microphysical properties made at a remote island, Minicoy in southern Arabian Sea for the period (February 2006-March 2007) are used to characterize their temporal variability and Black Carbon (BC) mass mixing ratio. Large decrease in aerosol BC (from ~800 ng m-3 to ~100 ng m-3) was observed associated with change in airmass characteristics and monsoon rains. The total aerosol mass varied between ~80 and 20 μg m-3. Though the total mass fell drastically, a slight increase in super micron mass was observed during the June-August period associated with high winds. The mass fraction of Black Carbon aerosols during the prevalence of continental airmass is found to be ~1.2% of the composite aerosols, which is much lower than the values reported earlier for this region
Eddy Current Testing of Zirconium Wires
FUEL bundles for Rajasthan Atomic Power Reactor, as per the design, consist of a cluster of 19 elements held together by zircaloy end plates and spaced by wire
helices on the six elements of the inner ring and alte-rnate elements of the outer ring. Each element is a zircaloy-2 tube 495 min long,1524 mm in diameter and of 0.4 nom wall thickness containing the nuclear fuel in
the form of sintered uranium dioxide pellets and sealed
at both ends. In order to provide the required spacing between the elements, zircaloy wire of 1.25 mm dia. is spot-welded around the elements in the helix form. The wire helices serve to separate the elements to maintain the dimensions of the coolant sub-channels between them
and to increase the mixing of coolant between inner and
outer sub-channels. Zircaloy wire of 1.63 mm dia. is
spot-welded on the outer elements so as to provide
bearing surfaces for the bundle when it moves through
the fuel channels in the coolant assemblies
Aerosol properties and BC mass mixing ratios over the Arabian Sea during ARMEX 2004
This article does not have an abstract
Personality profile and Stressful Life Events in Alcohol Relapse Patients.
INTRODUCTION:
Alcohol dependence is characterised by craving, compulsion, primacy
Of drinking over other activities and a state of neuronal adaptation leading to
Physical and mental disturbances on withdrawal. One of the most important
Problems in recovery from alcohol and substance abuse is relapse. Clinicians
Must always realize and be aware that relapse is a distinct possibility which can
Happen to anyone who is and has been dependent on alcohol. About 70 to 90%
Of clients with alcohol dependence relapse within three months. (Mc Lellan
Et al., 2000).
Relapse can be better understood as resulting from an interaction of
Client-,family-,social-, and treatment related factors. Researches into the causes
Of relapse led to classifying relapse determinants into two broad categoriesintrapersonal
And interpersonal determinants. Personality traits are an important
Intrapersonal determinant of relapse (Sandahl C, 1984).
PERSONALITY AND ALCOHOL RELAPSE
Allport defined personality as “the dynamic organization within the
Individual of those psychosocial systems that determine his unique adjustment
To his environment”.
Since long it has been hypothesized that personality bears a two way
Relationship with relapse. This relationship has been a topic of continuing
Debate and has led to varied and inconclusive results.
Theories favouring the existence of a separate ‘alcoholic personality’
Have not stood the test of time. However persons with certain personality traits
Are more prone for relapse. Neuroticism, novelty seeking, low ego strength and
High ergic tension are the variables commonly associated with alcohol relapse
When compared with abstaining individuals albeit inconsistently.
Adherence to psychosocial interventions, coping skills, attitude towards
Recovery and self perception of the ability to withstand stress are important
Variables which depend heavily on personality traits of the individuals.
Relapse prevention and its treatment form an integral part of
Management of alcohol dependence as relapse is a part of the chronic course of
The illness. Relapse prevention strategies incorporate various psycho social
Interventions and specific coping skills training in the treatment modality.
STRESSFUL LIFE EVENTS AND ALCOHOL RELAPSE
Stress is considered a major contributor to the continuation of alcohol
Use as well as relapse. The notion that stressful life events can cause susceptible
People to relapse to alcohol use has an intuitive appeal. Many studies that have
Determined an association between substance use and stress have been unable
To establish a causal relationship between the two. While theoretical and
Methodological ambiguities have resulted in inconsistent empirical support of
The relationship between personally experienced stress and return to drinking
(Allan and Cooke, 1985; Hall et al., 1990), findings indicate that personally
Threatening and chronic life stressors elevate the risk for relapse (Brown et al.,
1990).
Studies are inconsistent regarding the ‘tension reduction hypothesis’
Which posits that people use and relapse to alcohol in order to reduce stress.
However alcohol dependent individuals frequently experience stress related to
Occupational, legal, social and financial problems and negative events in their
Life predicted relapse to alcohol use more than positive life events. Hence the
Study of interactions between stressful life events and alcohol relapse has
Widespread implications for both assessment and treatment of the patients
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