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Search Results: 1 - 10 of 1036 matches for " Leena Khanna "
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Morbidly Adherent Placenta (MAP): Lessons learnt  [PDF]
Leena Wadhwa, Sangeeta Gupta, Pratibha Gupta, Bhawna Satija, Rupali Khanna
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.31A040
Abstract:

Context: Once a rare occurrence, MAP is becoming an increasing threat to maternal lives. Aims: To summarize our experience in the management of patients with morbidly adherent placenta. Introduction: MAP is a potentially life threatening hemorrhagic condition responsible for 7% - 10% maternal mortality. Settings and Design: Tertiary care center. Methods and Material: Retrospective study in which data of twelve patients with clinical diagnosis of morbidly adherent placenta was reviewed from Jan 2009 till Sept 2012. Results: The incidence of placenta accreta was found to be increasing every year. Out of twelve cases with clinical diagnosis of MAP, placenta previa was present in 10/12 patients with MAP. All patients had history of previous section. Two patients with preoperative diagnosis of MAP on USG/MRI were found to be normal intra-operative and in one patient focal accreta was diagnosed intraoperatively. Nine patients of MAP underwent caesarean hysterectomy due to excessive bleeding during placental separation and were confirmed histo-pathologically (3 accreta vera, 3 increta and 3 percreta). Internal iliac artery ligation was done in 2 patients. Two patients with placenta percreta had bladder rupture which was repaired and these two patients subsequently expired. Conclusions: The incidence of placenta accreta is increasing due to higher cesarean section (C/S) rate. Key to successful outcome is awareness, anticipation, preoperative counseling, planning and multidisciplinary approach.


Antitermite Activities of C. decidua Extracts and Pure Compounds against Indian White Termite Odontotermes obesus (Isoptera: Odontotermitidae)
Ravi Kant Upadhyay,Gayatri Jaiswal,Shoeb Ahmad,Leena Khanna,Subhash Chand Jain
Psyche , 2012, DOI: 10.1155/2012/820245
Abstract: In the present investigation, we have tested antitermite responses of Capparis decidua stem, root, flower, and fruit extracts and pure compounds to Odontotermes obesus in various bioassays. Crude stem extract has shown very high susceptibility and very low LD50 values, that is, 14.171 μg/mg in worker termites. From stem extract, three pure compounds were isolated in pure form namely, heneicosylhexadecanoate (CDS2), triacontanol (CDS3), and 2-carboxy-1, 1-dimethylpyrrolidine (CDS8) which have shown very low LD50 value in a range of 5.537–10.083 μg/mg. Similarly, one novel compound 6-(1-hydroxy-non-3-enyl)-tetrahydropyran-2-one (CDF1) was isolated from flower extract that has shown an LD50 8.08 μg/gm. Repellent action of compounds was tested in a Y-shaped glass olfactometer in which CDF1 compounds have significantly repelled termites to the opposite arm. Besides this, C. decidua extracts have shown significant reduction (<0.05 and 0.01) in termite infestation in garden saplings when it was coated on cotton tags and employed over tree trunks. Further, C. deciduas stem extract was used for wood seasoning, which gave very good results as test wood sticks have shown significantly (<0.05 and 0.01) very low termite infestation.
Smart Grid, Smart Controllers and Home Energy Automation—Creating the Infrastructure for Future  [PDF]
Abhishek Khanna
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.33024
Abstract: Integration of unpredictable renewable power sources into the Grid is leading to the development of wide area control algorithms and smart grid. Smart meters are the first step in the building a smart consumer interface. Much more, however, would be required in building a smart grid than just smart meters. This paper explores the conceptual architecture of smart grid. It highlights the need for additional infrastructure to realize full potential of smart grid. The information presented in this paper is an attempt to uncover what the future in smart grid could be and what infrastructure would be required to tap its potential. As smart grid evolves, more functionality would be built in the constituents. The paper also proposes mathematical basis for some of the controller algorithms.
Collaborative Meeting as an Integrative Mechanism in a Multinational Investment Project  [PDF]
Leena Pekkinen, Jaakko Kujala
Technology and Investment (TI) , 2014, DOI: 10.4236/ti.2014.51006
Abstract:

In multinational and complex projects that are often implemented by multiple organizations, the entire projects need to be divided into manageable subprojects. At the same time, all subprojects are needed to be kept aligned with the project goals and targets by integration and coordination. The purpose of this article is to study the role of a particular, work-shop type, collaborative meeting by utilizing the characteristics of an integrative information processing framework. A single case study method was used to observe the practices of collaborative meetings. This study contributes to the project management research by analysing how collaborative meeting practice can be used as a mechanism to reduce uncertainty and equivocality in a large investment project. The results of this study are two folds: Firstly, the case project’s collaborative meetings are described in detail; secondly, the perceived features and procedures of the collaborative meetings in the case project are illustrated showing the role of the collaborative meetings as an integrative tool. Moreover, the perceived integrative characteristics of the collaborative meetings reducing uncertainty and equivocality are presented. This study indicates that collaborative meeting is an integrative mechanism reducing uncertainty and equivocality in a large investment project context.

Risk Management in Project Networks: An Information Processing View  [PDF]
Leena Pekkinen, Kirsi Aaltonen
Technology and Investment (TI) , 2015, DOI: 10.4236/ti.2015.61005
Abstract: Increasingly, projects are executed by networks of organizations. The networked form of organization has many important implications for project risk management. Information processing theories introduce mechanisms for processing information inside organizations as well as among organizations to reduce the uncertainty and equivocality inherently present in international projects. This study aims to examine the risk management practices involved at a project network level through an empirical analysis of one complex large project network executed in a challenging institutional environment. With regard to network level risk management, the paper identifies eight formal information processing mechanisms for implementing risk management: (1) established rules and criteria for the selection of subcontractors at a global level, (2) specification of responsibilities in the contract, (3) formal risk sheet, (4) progress follow-up tool, (5) database for project information, (6) customer reporting system, (7) updated project plan after the project is delayed, and (8) country study team. Personal relationships between parties, personal commitment, experienced individuals, and face-to-face meetings are identified as informal information processing mechanisms used as measures of project risk management to reduce equivocality. We also elaborate the fitness of the mechanisms used for the contextual situations of the project network settings.
Use of Masonry Construction & Demolition Waste in Concrete  [PDF]
Tahir Kibriya, Leena Tahir
World Journal of Engineering and Technology (WJET) , 2017, DOI: 10.4236/wjet.2017.52017
Abstract: Massive amounts of brick waste are obtained from demolition of old buildings and structures around the world. With the increased stress on sustainable construction, and environmentally friendly materials and greener concreting practices, a large proportion of such waste bricks are crushed and mixed with normal aggregates for use in concrete. The performance of concrete containing waste brick aggregates partially replacing normal aggregates have not been investigated for their performance. This paper covers investigations carried out on concrete with such aggregates obtained from demolition waste and mixed with varying proportions of normal aggregates to produce concrete. Two types of crushed brick aggregates were mixed with gravel in the ratios of 30:70 and 40:60 by weight and specimen were cast for investigations. Two w/c ratios were investigated. Various tests were carried out to assess the compressive strength of cubes and cylinders of mixed aggregates concrete along with f1exural strength, stress/strain behavior, moduli of elasticity, ultrasonic pulse velocity determination, densities, surface absorption, shrinkage and frost resistance. The values obtained from these tests were compared with the values of concrete with normal aggregates (gravel) with similar w/c ratios. While the strength tests and durability tests more or less gave satisfactory results however the larger moisture absorption by the waste brick aggregates reduces the frost resistance capacity somewhat thereby care needs to be exercised in using these mixes in regions/areas susceptible to frost.
Sustainable Construction—High Performance Concrete Containing Limestone Dust as Filler  [PDF]
Tahir Kibriya, Leena Tahir
World Journal of Engineering and Technology (WJET) , 2017, DOI: 10.4236/wjet.2017.53034
Abstract: Massive amounts of limestone waste are produced by the stone processing industry worldwide. Generally, it is believed that 60% to 70% of the stone is wasted in processing in the form of fragments, powder and slurry out of which around 30% is in the form of fine powder [1]. This waste has no beneficial usage and poses environmental hazards. Use of this waste product in the construction industry can largely reduce the amount of waste to be disposed off by the local municipalities in addition to reducing large burden on the environment. Some basic research on use of limestone dust as cement/ concrete filler?has?been carried out in the recent past but high strength/ high performance concretes have not been investigated yet [2] [3]. The concrete industry is among the largest consumer of raw materials worldwide and has been investigated for use of various types of waste materials like crushed brick, rice husk and straw ash as either aggregates for concrete or as partial cement substitutes. Use of limestone dust as filler material in concrete can consume a huge amount of this waste material which has to be disposed off otherwise, creating large burden on the environment. This experimental study aimed at evaluating the properties of high performance concretes made from Portland cement, natural aggregates and sand. Limestone dust was added by replacing sand in the percentages of 10% and 20%. Wide ranging investigations covering most aspects of mechanical behavior and permeability were carried out for various mixes for compressive strengths of 60?N/mm2, 80?N/mm2 and 100?N/mm2.
Sustainable Construction—Use of Stone Dust as Plasticiser in High Strength SCC with Blended Cement  [PDF]
Tahir Kibriya, Leena Tahir
World Journal of Engineering and Technology (WJET) , 2017, DOI: 10.4236/wjet.2017.53035
Abstract: Extensive growth in the developing countries due to infrastructure development is resulting into massive consumption of concrete thereby increasing the demand on concrete materials. Quite large amounts of fine aggregates are required for concrete in developing countries thus shortages of quality river sand is putting pressure on availability of fine aggregates. To fulfill the high demand of fine aggregates, a search for alternative materials is in process. Stone crushing and processing industry is a large industry which generates large amounts of stone dust and slurry which is a waste produced from this process. Tons of such waste generated has no useful purpose except as landfill material. Some preliminary studies have been conducted into use of marble/ limestone waste for use in concrete [1] [2].?This study aims at using stone dust as partial replacement of sand in concrete to observe its effects on workability and other mechanical properties. This would result in useful consumption of this waste product thereby eliminating environmental issues related to its disposal. Partial replacement of 10% and 20% sand replacement with stone dust is carried out with the use of self-compacting concrete with blended cement. Blended cement used contains 50% rice husk ash and 50% Portland cement. Such high strength SCC with blended cement containing 50% rice husk ash and 50% Portland cement has already been tested to provide better quality concrete [3]. Wide ranging investigations covering most aspects of mechanical behavior and permeability were carried out for various mixes for compressive strengths of 60?MPa & 80?MPa. Compressive strengths of high strength SCC with blended cements and 10% and 20% replacement of sand with stone dust for 60?MPa and 80?MPa were observed to be higher by about 10% to 13% than the control specimen. Higher elastic moduli and reduced permeability were observed along with better sulphate and
Determinants of IPOs Initial Return: Extreme Analysis of Indian Market  [PDF]
Rohit Bansal, Ashu Khanna
Journal of Financial Risk Management (JFRM) , 2012, DOI: 10.4236/jfrm.2012.14012
Abstract: This paper attempts to design and test empirical models, which integrate theoretical, institutional, and other factors, which interact to explain ownership structure. Ex-ante information at the level of under-pricing succeeds the Indian stock market crunch. The study is based on IPO that listed at Bombay stock exchange given that April 2000 to December 2011. Multiple linear regressions are used to distinguish the relationship between various independent variables with the dependent variable, i.e. level of underpricing. The outcomes of multiple regressions reveal that, firm’s age, IPO years, book building pricing mechanism, ownership structure, issue size, & market capitalization explained 44% of the variation in issuer under-pricing, Durbin Watson’s value subsisted 1.58, which indicates that, there is a positive sequential rela-tionship between variables. Number of share offered, issue size, market capitalization, subscription offer timing, book building mechanism and IPO years 2006, 2009 & 2011 are constructed to have important effect on the level of underpricing after the Indian market crisis. Nevertheless, firm’s age, IPOs year 2008, private issuing firms, non institutional promoters, Indian promoters and non institutional non promoters contain no significant difference in the level of underpricing after-market crisis.
A Comparative Study of Closure of Tympanic Membrane Perforation between Chemical Cauterization and Fat Plug Myringoplasty  [PDF]
Manabendra Debnath, Swagata Khanna
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2013, DOI: 10.4236/ijohns.2013.26052
Abstract:

The purpose of closure of small dry tympanic membrane perforations is to restore the continuity of the tympanic membrane in order to improve hearing and decrease the incidence of middle ear infections. Small and cost effective procedures like Chemical Cauterization and Fat Plug Myringoplasty have been found to be effective in healing small central perforations with significant hearing improvement. A study was carried out in 69 patients with central perforations in the Department of ENT, Gauhati Medical College & Hospital for the duration of 1 year from August 11 to July 12. Out of 69 patients, 36 underwent Chemical Cauterization and 33 Fat Plug Myringoplasty. Pre-and post-operative hearing assessments of each patient were done and statistically analyzed. The success rate was found to be 83.33% and 90.9% respectively. In both groups, there was statistically significant hearing improvement with a P value 0.01. From our study, it was found that the two procedures are simple, reliable and also lessened the morbidity of the patient. Thus we recommend the use of these two official procedures for the treatment of central perforations of tympanic membrane less than 5 mm.

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