119 research outputs found
An Investigation Of Cloud Processes Relevant To Climate Sensitivity
Get PDFBased on the Fourth Assessment Report of the IPCC, cloud feedbacks are the largest source of uncertainty in predicting the Earth's climate response to CO2 radiative forcing. Various global climate models estimate that this response amplifies the initial CO2 forcing by a factor between 2 and 5. The research in this dissertation aims to better understand cloud processes that have been identified as critical for understanding cloud feedbacks. The three topics pursued are characterization of the ice fall speed in cirrus clouds, ice nucleation in cirrus clouds and ground-based remote sensing of cloud properties in ice clouds and mixed phase clouds.Studies have shown that the ice fall speed determines one of the most important climate feedback processes. The mass weighted ice fall speed (Vm) in mid-latitude cirrus clouds is computed from in-situ measurements of ice particle area and number concentration by the 2 Dimensional Stereo (2D-S) probe. Vm is parameterized in terms of cloud temperature (T) and ice water content (IWC) and also by relating Vm to ice particle effective diameter (De). Mid-latitude cirrus cloud data is also used to investigate two classes of ice nucleation: homogeneous and heterogeneous processes. Better understanding the role these two categories play in ice production is crucial for predicting cirrus cloud properties and the impact of aerosol particles on cirrus clouds in GCMs. The temperature dependence of the ice particle size distribution, number concentration-to-ice water content ratio, ice particle shape and fall speed all provide important clues revealing the relative roles of these nucleation categories.Lastly an exploratory remote sensing methodology is presented to retrieve cloud properties in ice clouds and mixed-phase clouds by using data from the Atmospheric Emitted Radiance Interferometer (AERI) and the Milli-Meter Cloud Radar (MMCR) in the Arctic
Rupture of non-communicating horn of a bicornuate uterus
Get PDFA primigravida at 20 weeks GA was referred as a case of bleeding P/V with an USG report showing intra-uterine foetal demise. Accordingly we induce her with misoprostol followed by ethacrydine lactate but there was no progress. On repeat USG here we saw there was rupture of a horn of uterus with abortus free in peritoneal cavity. On laparotomy there was 1 litre of hemoperitoneum with abortus lying free inside. There was rupture of a non-commnicating horn of a bicornuate uterus which was excised and uterine wall repaired
Development of transition metal dichalcogenide based quantum dots for light emitting diodes
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A Study on Genotoxic Potential of Acephate in Clarias batrachus
Get PDFAcephate is an insecticide made up of organophosphates. It is applied to food crops, citrus trees, on golf courses, in commercial or institutional buildings, and as a seed treatment. Products containing acephate can be purchased as tablets, liquids, granules, powders, and water-soluble packs. Acephate 75% brand name-Asataf insecticide manufactured by TATA RALLIS was used for the test. The solvent used was glass double distilled (g.d.d.) water. Fresh water catfish Clarias batrachus were collected from local water bodies of Cuttack district. All the fishes were acclimatized for fifteen days in laboratory aquaria containing 30L dechlorinated tap water prior to the initiation of the experiment. The peripheral blood smear slides were prepared from the blood collected by caudal incision in accordance with Al-Sabti (1986) and Das and Nanda (1986) with some modifications which were prepared animals were sacrificed after 24, 48 and 72 hours of Exposure and were used for each treatment group in both types of administrations (IP and dermal). The increased concentration of acephate directly affects our biological fish sample i.e. Clarias batrachus. Acephate is causing serious problems in fish as per our genotoxicity study of acephate on Clarias batrachus. Clarias batrachus is a commonly found fish species in fresh water habitat which includes ponds, ditches, wetlands and rice fields of India specially in Odisha.The irrational use of pesticides containing acephate in agriculture cause harmful effects on Clarias batrachus, which is a most important species of fish for maintaining the aquatic diversity
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