| 1. |
- Riley, M A, et al.
(författare)
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Beyond band termination in Er-157 and the search for wobbling excitations in strongly deformed Hf-174
- 2005
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 31:10, s. 1735-1740
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Tidskriftsartikel (refereegranskat)abstract
- High-spin terminating bands in heavy nuclei were first identified in nuclei around Er-158(90). While examples of special terminating states have been identified in a number of erbium isotopes, almost nothing is known about the states lying beyond band termination. In the present work the high-spin structure of Er-157 has been studied using the Gammasphere spectrometer. The subject of triaxial superdeformation and 'wobbling' modes in Lu nuclei has rightly attracted a great deal of attention. Very recently, four strongly or superdeformed (SD) sequences have been observed in Hf-174 and ultimate cranker calculations predict, such structures may have significant triaxial deformation. We have performed two experiments in an attempt to verify the possible triaxial nature of these bands. A lifetime measurement was performed to confirm the large (and similar) deformation of the bands. In addition, a high-statistics, thin-target experiment was run to search for linking transitions between the SD bands and possible wobbling modes.
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| 2. |
- Riley, M. A., et al.
(författare)
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Observation of states beyond band termination in Er-156,Er-157,Er-158 and strongly deformed structures in Hf-173,Hf-174,Hf-175
- 2006
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Ingår i: Physica Scripta. - 0031-8949. ; T125, s. 123-126
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Tidskriftsartikel (refereegranskat)abstract
- High-spin terminating bands in heavy nuclei were first identified in nuclei around Er-158(90). While examples of terminating states have been identified in a number of erbium isotopes, almost nothing is known about the states lying beyond band termination. In the present work, the high-spin structure of Er-156,Er-157,Er-158 has been studied using the Gammasphere spectrometer. The subject of triaxial superdeformation and 'wobbling' modes in Lu nuclei has rightly attracted a great deal of attention. Very recently four strongly or superdeformed (SD) sequences have been observed in Hf-174, and cranking calculations using the Ultimate Cranker code predict that such structures may have significant triaxial deformation. We have performed two experiments in an attempt to verify the possible triaxial nature of these bands. A lifetime measurement was performed to confirm the large (and similar) deformation of the bands. In addition, a high-statistics, thin-target experiment took place to search for linking transitions between the SD bands, possible wobbling modes, and new SD band structures.
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| 3. |
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| 4. |
- Valiente-Dobon, JJ, et al.
(författare)
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Evidence for nontermination of rotational bands in Kr-74
- 2005
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Ingår i: Physical Review Letters. - 1079-7114. ; 95:23
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Tidskriftsartikel (refereegranskat)abstract
- Three rotational bands in Kr-74 were studied up to (in one case one transition short of) the maximum spin I-max of their respective single-particle configurations. Their lifetimes have been determined using the Doppler-shift attenuation method. The deduced transition quadrupole moments reveal a modest decrease, but far from a complete loss of collectivity at the maximum spin I-max. This feature, together with the results of mean field calculations, indicates that the observed bands do not terminate at I=I-max.
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| 5. |
- Dutta, K., et al.
(författare)
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Detection of pesticide by polymeric enzyme electrodes
- 2008
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Ingår i: Ecotoxicology and Environmental Safety. - : Elsevier Science B.V., Amsterdam. - 0147-6513 .- 1090-2414. ; 69:3, s. 556-561
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Tidskriftsartikel (refereegranskat)abstract
- Screen-printed electrodes (SPEs) containing immobilized acetylcholine esterase (AChE) enzyme were used for the electrochemical determination of organophosphorous (OP) and carbamate pesticides. The extent of AChE deactivation by the pesticide was determined in the presence of acetylcholine (AChCl) substrate. The unique nature of this approach lies in the enzyme immobilization procedure in which AChE was attached to the SPE by in situ bulk polymerization of acrylamide to ensure efficient adherence within the membrane with minimal losses in enzyme activity. Responses were observed for the pesticides Monocrotophos, Malathion, Metasystox and Lannate over the concentration range 0-10 ppb (mu g L-1). (C) 2007 Elsevier Inc. All rights reserved.
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| 6. |
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| 7. |
- Mukherjee, A. B., et al.
(författare)
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Mercury emissions from industrial sources in India and its effects in the environment
- 2009
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Ingår i: Mercury Fate and Transport in the Global Atmosphere. - Boston, MA : Springer-Verlag New York. - 9780387939575 - 9780387939582 ; , s. 81-112
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Bokkapitel (refereegranskat)abstract
- This study describes the atmospheric mercury (Hg) emissions from industrial sources in India for the years 2000 to 2004. In India emission inventories of Hg and other trace elements from anthropogenic sources have been largely neglected, although the GDP (Gross Domestic Products growth) has touched 9.6% at the beginning of the 21st century. In coal production India is the third largest in the world, whereas Indian cement and brick production have reached second place in the world. With increased industrial development, acute pollution problems have been identified in the subcontinent. There is no consistent earlier information for Hg emissions to the environment for any sectors of industry. This paper may be the first road map in which we have tried to find out the total emission of Hg from a wide range of sources, e.g. from coal combustion to clinical thermometers broken during production or packing. There is a lack of basic data and in an attempt to correct this, emission factors suitable for Asian countries have been selected to complete this study. Before this document, there were some efforts in Europe to develop emission inventories for Hg from coal combustion or chlor-alkali plants for India. In this study it was found that total atmospheric emission from industrial sources has decreased from 321 Mg in 2000 to 253 Mg in 2004 due to a switch for the membrane cell process in the chlor-alkali industry. In 2004 the largest part of the Hg emissions stemmed from coal combustion in thermal power plants. Hg-cell technology had been used earlier in chlorine and sodium hydroxide production, as a result of which Hg concentration in terrestrial and aquatic species are nowadays quite high in coastal areas. India can thus be referred to as a mercury hot spot. We have received limited information on emissions of Hg from industrial sources in India. Estimates are based on emission factors and the values taken from the literature. Against a background of limited data and information, this paper gives an overview of Hg emissions in India and of the recent steps undertaken by authorities to curb the emissions of Hg and its subsequent trans-boundary movement in the global environment.
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| 8. |
- Pal, A., et al.
(författare)
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Fault and attack management in optical network
- 2007
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Ingår i: 2007 1st International Symposium on Advanced Networks and Telecommunications Systems, ANTS. - : IEEE. - 1424418593 - 9781424418596 ; , s. 25-26
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Konferensbidrag (refereegranskat)abstract
- This paper proposes a scheme containing (a) the detection of faults or attacks through monitoring devices raising alarms and (b) the localization of them by invoking an algorithm. We demonstrate the performance of this scheme on Euro Net.
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| 9. |
- Pal, A., et al.
(författare)
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Fault detection and localization scheme for multiple failures in optical network
- 2008
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Konferensbidrag (refereegranskat)abstract
- This paper proposes fault detection and localization scheme to handle multiple failures in the optical network using wavelength-division multiplexing (WDM) technology. This proposed scheme is two-phased scheme containing (a) the detection of faults through monitoring devices raising alarms (fault detection) and (b) subsequently the localization of these faults (fault localization) by invoking an algorithm. The later phase will obtain a set of potential faulty nodes (links). We demonstrate the performance of the scheme on 14-node NSFNet and 28-node EuroNet. We compare our scheme with an existing algorithm [1] for locating faulty nodes (links). Our scheme outperforms the existing one.
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| 10. |
- Seetharam, A., et al.
(författare)
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Estimation of node density for an energy efficient deployment scheme in wireless sensor network
- 2007
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Ingår i: 3rd IEEE/Create-Net International Conference on Communication System Software and Middleware, COMSWARE. - : IEEE. - 9781424417971 ; , s. 95-98
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Konferensbidrag (refereegranskat)abstract
- Wireless sensor network is a collection of nodes which can communicate with each other without any prior infrastructure along with the ability to collect data autonomously, effectively and robustly after being deployed in an ad-hoc fashion to monitor a given area. Since these nodes communicate in wireless sensor network one major problem often encountered in this network is obtaining an optimal balance among the number of nodes deployed, energy efficiency and lifetime. In this paper we propose an effective method to estimate the number of nodes to be deployed in a given area for a predetermined lifetime so that total energy utilization and 100% connectivity are ensured. This scheme also guarantees that during each data collection cycle, each node dissipates the requisite minimum amount of energy, which also minimizes the number of nodes required to achieve a desired network lifetime. Extensive simulations have been carried out to establish the effectiveness of the scheme.
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