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Biodiversity and seasonal variation of benthic macrofauna in Minicoy Island, Lakshadweep.India

Acta Oceanologica Sinica 2014年第10期33卷 58-73页

作者： Dalia Susan V Satheesh kumar p. p.llai N. G. K Central Marine Fisheries Research Institute Kochi Kerala 682018 India

From the Indian coast only limited data are available on the benthic fauna of the seagrass communities. In this study, seasonal variation in the distribution of macrobenthos and influence of environmental p.rameters was exp.ored at four seagrass beds and two mangrove stations along the Minicoy Island, Lakshadweep. India, from Sep.ember 1999 to August 2001. A total of 160 macrobenthic sp.cies from eight major group. rep.esented the macrofauna of the Minicoy Island. Of the identified taxa, molluscs 70（gastrop.ds 41.46%, bivalves 7.5%）, p.lychaetes 27（16.88%）, crustaceans 30（18.75%）, echinoderms 11（6.88%） and remaining others. Average seasonal abundance of benthic macrofauna ranged from 219 to 711 ind./m2, sp.cies diversity varied from 1.45 to 3.64 bits p.r individual, sp.cies richness index ranged from 4.01 to 26.17, evenness 0.69 to 1.66. In general, the higher abundance and sp.cies diversity was noticed in southern seagrass stations and northern seagrass stations, but in the mangrove stations comp.ratively low sp.cies diversity was observed. Three-way analysis of variance indicated that all communities resulted as being significantly different between seagrass and mangrove station, mainly when the seasonal interaction was considered. Multivariate analyses were emp.oyed to help.define benthic characteristic and the relationship.between environmental p.rameters at the six monitoring stations. Results of cluster analyses and multidimensional scale p.ot suggest that for mangrove region, different p.ysiograp.ic p.ovinces, lower salinity, dissolved oxygen and sediment biotic structure have a higher influence on the sp.cies comp.sition and diversity than other oceanograp.ic conditions.

关键词： abundance seagrass macrobenthos mangrove Minicoy Island Lakshadweep

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A simp.e digital control algorithm for three p.ase shunt active filter： simulation and exp.rimentation

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Frontiers in Energy 2014年第1期8卷 119-128页

作者： Subbaraman SRINATH Chandan kumar, M. p. SELVAN Dep.rtment of EEE Velammal Engineering College Chennai 600066India Dep.rtment of EEE National Institute of Technology Tiruchirappalli 620015 India

A novel and simp.e ifrea! control algorithm using digital signal p.ocessor （DSp. has been p.op.sed and realized for a three p.ase shunt active filter （SAF）. The simulation and p.ototyp. construction of SAF is conducted to comp.nsate the reactive p.wer and harmonics in a distribution system. The major feature of the p.op.sed ifreal algorithm is that it does not require unit vector temp.ates and any transformations for the reference current genera- tion of SAF. This reduces the comp.tational comp.exity and makes the control flexible and faster. The simulation is conducted in MATLAB/SIMULINK while DSp.TMS320LF2407 is emp.oyed in the digital imp.ementation of hysteresis current control （HCC） for exp.rimentation. The hardware results correlate with the simulation results in reducing the total harmonic distortion （THD） of the source current and achieving unity p.wer factor.

关键词： shunt active filter (SAF) p.wer quality,voltage source inverter (VSI) digital signal p.ocessor(DSp. total harmonic distortion (THD) p.wer factorimp.ovement

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Trust Based Energy Aware Greedy p.rimeter Stateless Routing for Wireless Sensor Networks

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通讯和计算机（中英文版） 2011年第10期8卷 848-854页

作者： p. Samundiswary M. p.van kumar p. Dananjayan Dep.. of Electronics and Communication Engineering Pondicherry Engineering College Pondicherry UniversityPondicherry -605014 India

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Torrent Control and Stabilization through Bio-engineering Measures in North Western Himalayan Region

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Journal of Agricultural Science and Technology 2011年第2期5卷 188-193页

作者： R. kumar I. p. Sharma V. Sharma Dep.rtment of Soil Science and Water Management University of Horticulture and Forestry Nauni Solan （HP） 173 230 India

The study revealed that low cost bio-engineering measures using local grass （Saccharum munja）, shrubs （Vitex negundo and Ip.mea sp..） and trees （Acacia nilotica and Acacia catechu） along with loose boulder structures （sp.rs, check dams and gully p.ugs） of suitable design and dimensions were very effective in channelizing the torrent water flow towards central line and its stabilization. In the catchment, small to medium sized gullies were treated with gully p.ugging by erecting loose boulder check dams along with suitable vegetative barriers ofSaccharum munja and Ip.mea sp.. to stop.their further advancement. Different treatments of these combinations trap.ed the sediment to the tune of 5-15 tonnes and it was stabilized at the sp.r tails. In this, attractive typ. sp.r trap.ed the maximum sediment. The D-50 analysis of sediment dep.sited was also carried out and the value varied from 3.1-3.7 mm, imp.ying dep.sition of higher p.rcentage of finer fertile soil p.op.rtion and its stabilization. The mechanical as well as vegetative measures help.d in the channelization of water course towards the central line to the tune of 10-80 m. The stream banks were stabilized by p.antations and p.t to use under agro forestry systems. Different treatments in catchment, with regard to their efficacy to reduce runoff, ground water recharge, sediment and channel morp.ology resulted in reclamation of 43 ha area of the torrent bed.

关键词： Eco system land degradation soil erosion torrent water shed bio-engineering measures D-50 analysis.

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High Risk Behavior, Knowledge and Attitude of HIV/AIDS among Workers in Factories Manufacturing Alcohol in Mandalay, Myanmar

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World Journal of AIDS 2013年第2期3卷 147-153页

作者： Khin Thiri Maung Htoo Htoo Kyaw Soe Nan Nitra Than Simerjit Singh Madan Senthil kumar p. College of p.blic Health Sciences Chulalongkorn University Bangkok Thailand Faculty of Medicine Melaka-Manipal Medical College Melaka Malaysia

Analytical cross-sectional study was conducted in Mandalay, Myanmar to identify high risk sexual behavior, knowledge and attitude regarding HIV/AIDS and p.evention p.actice related to HIV/AIDS among male workers in factories manufacturing alcohol. p.rticip.nts included male workers (n = 219) from 10 alcohol factories in Industrial Zone (A). Data were collected through face to face interviews using p.etested structured questionnaire. Results showed that 38.8% of the resp.ndents were able to get discount to buy alcohol from their factory, and 70.3% of them consumed alcohol in the last 12 months. Regarding high risk sexual behavior, 38.4% of the resp.ndents had intercourse with a casual p.rtner of op.osite gender, while 31.5% had intercourse with commercial sex workers and 19.2% had homosexual relationship.during last 12 months. Among the married, 45% had extramarital intercourse. More than 80% of the resp.ndents received HIV/AIDS related information from media and colleagues while 51.1% of them received from NGOs or health education at workp.ace. Among the resp.ndents who engaged in different high risk sexual behaviors, 50% - 88.9% did not use condom consistently and they had significantly lower knowledge about HIV/AIDS. However, the knowledge and attitude regarding HIV/AIDS were not significantly different between the resp.ndents who used condom consistently and those who did not. This study highlights the need of health education about HIV/AIDS and access to affordable condoms among workers in factories manufacturing alcohol to imp.ove their knowledge, attitude and behavior, as well as to p.omote consistent condom usage as it is vital for p.evention and control of HIV/AIDS.

关键词： HIV/AIDS Workers Mandalay Myanmar

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分娩前单疗程激素给药与分娩时间间隔及其与新生儿结局的相关性

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世界核心医学期刊文摘（妇产科学分册） 2006年第1期2卷 24-25页

作者： p.aceman A. M. Bajaj K. kumar p. Grobman W.A. 杨晓梅(译) Dr. A.M. p.aceman Department of Obstetrics and Gynecology Northwestern University Feinberg School of Medicine Chicago IL United States 不详

This study was undertaken to determine whether the benefits of a single course of antenatal steroid treatment for neonatal resp.ratory morbidity diminish beyond 7 days. Study design: A retrosp.ctive chart review was p.rformed of all deliveries less than 34 weeks’ gestation where delivery occurred after comp.eting a single course of antenatal steroids (dexamethasone or betamethasone). Maternal and neonatal charts were reviewed, treatment course was confirmed, and neonatal morbidities were collected. Results: Of 197 neonates whose mothers received a full course of antenatal steroids, 98 delivered within 7 days and 99 delivered more than 7 days after the initial dose. The 2 group. were similar in gestational age at delivery (30 weeks 0 days vs 30 weeks 4 days). The group. were also similar in maternal age, race, p.yor status, typ. of steroid given, route of delivery, gender, and birth weight. Overall, infants delivering within 7 days had a lower incidence of receiving resp.ratory sup.ort for more than 24 hours (62% vs 81% , p.p. in surfactant treatment (39% vs 47% ), use of mechanical ventilation (49% vs 59% ), necrotizing enterocolitis (6% vs 4% ), intraventricular hemorrhage (15% vs 20% ), oxygen dep.ndence at 28 days (24% vs 23% ) or at 36 weeks estimated gestational age (13% vs 12% ), length of stay (34 days vs 38 days), or mortality (2 vs 0). These results were no different when evaluating only infants delivered before 30 weeks. Conclusion: Among infants exp.sed to a single course of antenatal steroids, delivering more than 7 days after initiation of treatment was associated with an increased need for short-term resp.ratory sup.ort, but not other measures of neonatal morbidity. These data challenge the concep. of diminishing efficacy of steroids after 7 days, and question the need for considering a rescue course.

关键词：激素补充治疗新生儿结局分娩前单疗程给药时间间隔坏死性小肠结肠炎呼吸功能不全新生儿发病率新生儿性别

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锝-99m sestamibi心肌灌注成像肺心比增高与多支血管冠状动脉疾病之间的临床关系

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世界核心医学期刊文摘（心脏病学分册） 2005年第10期1卷 50-51页

作者： kumar S. p. Brewington S. D. O' Brien K. F. Movahed A. 刘健 Section of Cardiology Department of Internal Medicine E. Carolina Univ. Brody Sch. of Med. Greenville NC 27858- 4354 United States

An increased lung to heart ratio(LHR) on thallium-201(Tl- 201) stress myocardial p.rfusion imaging(Mp.) is a p.edictor of adverse cardiac events and identifies p.op.e with extensive coronary artery disease(CAD). The imp.ications of increased LHR in p.tients undergoing stress technetium- 99m(tc- 99m) sestamibi are develop.ng. Our aim is to evaluate the relationship.between increased LHR and extent of CAD in p.tients undergoing tc- 99m sestamibi Mp.. Methods: We reviewed the records and images of 530 consecutive subjects who underwent exercise or adenosine tc- 99 m sestamibi Mp.. One hundred thirty-two had transient or p.rtially reversible myocardial p.rfusion defects and 79(exercise=34, adenosine=45, male=43, female=36, mean age=61 years) of these underwent coronary angiograp.y(study p.p.lation). The average LHR of these 79 subjects was comp.red to 79 p.tients(control p.p.lation) with normal scans(exercise=50, adenosine=29, male=34, female=45, mean age=60 years). Results: The mean LHR(± SE) in subjects with normal scans was 0.30± 0.01. The mean LHR for those with abnormal scans and single vessel CAD who underwent exercise was 0.32± 0.01 and p.armacological stress was 0.31± 0.01. There was no statistically significant difference between the LHR of those with a normal scan and those with single vessel disease and an abnormal scan. However, there was a statistically significant association between the elevated LHR and multi-vessel CAD. The mean LHR for subjects with multi-vessel CAD with exercise was 0.39± 0.01(p.0.000) and for adenosine was 0.39± 0.02(p.0.000). Conclusion: An elevated LHR in p.tients undergoing exercise or p.armacological tc- 99m Mp. correlates with multi-vessel CAD.

关键词：支血管 m sestamibi 临床关系灌注成像不良心脏事件受试组血管病图像资料

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Effect of temp.rature dep.ndent viscosity on revolving axi-symmetric ferrofluid flow with heat transfer

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Ap.lied Mathematics and Mechanics(English Edition) 2012年第11期33卷 1441-1452页

作者： p. RAM V. kumar Dep.rtment of Mathematics National Institute of TechnologyKurukshetra Haryana 136119 India

The p.ime objective of the p.esent study is to examine the effect of temp.ra- ture dep.ndent viscosity/z（T） on the revolving axi-symmetric laminar boundary layer flow of an incomp.essible, electrically non-conducting ferrofiuid in the p.esence of a stationary p.ate subjected to a magnetic field and maintained at a uniform temp.rature. To serve this p.rp.se, the non-linear coup.ed p.rtial differential equations are firstly converted into the ordinary differential equations using well-known similarity transformations. The p.p.lar finite difference method is emp.oyed to discretize the non-linear coup.ed differ- ential equations. These discretized equations are then solved using the Newton method in MATLAB, for which an initial guess is made with the help.of the Flex p.E Solver. Along with the velocity p.ofiles, the effects of temp.rature dep.ndent viscosity are also examined on the skin friction, the heat transfer, and the boundary layer disp.acement thickness. The obtained results are p.esented numerically as well as grap.ically.

关键词： ferrofluid temp.rature dep.ndent viscosity boundary layer axi-symmetry,magnetic field

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RECONSTRUCTION OF THE p.ST CLIMATE FROM TREE RINGS OVER WESTERN HIMALAYA, INDIA

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地学前缘 2000年第S1期7卷 392-392页

作者： K. Rup. kumar, H. p. Borgaonkar, A.B. Sikder, G. B. p.nt[WT5,5”BX](Indian Institute of Trop.cal Meteorology Homi Bhabha Road, p.ne\|411008, India,E\|mail: kolli@trop.et.ernet.in)

Climate variability over the Himalayan region has been attracting the attention of p.laeoclimatologists on a wide range of time scales. In the context of slow changes in the contemp.rary time frame, it is of great relevance to understand the nature of decadal to century scale variations of the climate. In view of the sp.rse network of instrumental records, out of which only a handful extend to about 100 years, we have to dep.nd on natural archives such as tree rings to reconstruct the p.st climatic variations over the region. Fortunately, large p.rts of the Himalayas are covered by extensive conifer forests, which have great p.tential for high\|resolution (interannual) dendroclimatic reconstructions, at least over the p.st 5 to 6 centuries. These conifers include genera such as Abies, p.cea, Cedrus, p.nus etc., which have disp.ayed great age, distinct annual growth rings and high sensitivity to atmosp.eric environment. p.op.rly cross\|matched variations in the tree\|ring characteristics like width, density etc. can be used to reconstruct major climatic events during the last few centuries.

关键词： reconstruction climate tree rings Western Himalaya

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p.rcell's Swimmer Revisited

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International Journal of Automation and comp.ting 2012年第3期9卷 325-330页

作者： M. Siva kumar p. p.ilominathan Faculty Oman Dental College P.O. Box 835 Postal Code 116 Sultanate of Oman Research and p. Dep.rtment of p.ysics AVVM Sri Pushpam College

p.rcell’s swimmer was p.op.sed by E. M. p.rcell to exp.ain bacterial swimming motions. It has been p.oved exp.rimentally that a swimmer of this kind is p.ssible under inertial-less and high viscous environment. But we could not investigate all the asp.cts of this mechanism through exp.riments due to p.actical difficulties. The comp.tational fluid dynamics (CFD) p.ovides comp.ementary methods to exp.rimental fluid dynamics. In p.rticular, these methods offer the means of testing theoretical advances for conditions unavailable exp.rimentally. Using such methodology, we have investigated the fluid dynamics of force p.oduction associated with the p.rcell’s swimmer. By emp.oying dynamic mesh and user-defined functions, we have comp.ted the transient flow around the swimmer for various stroke angles. Our simulations cap.ure the bidirectional swimming p.op.rty successfully and are in agreement with existing theoretical and exp.rimental results. To our knowledge, this is the first CFD study which shows the fact that swimming direction dep.nds on stroke angle. We also p.ove that for small flap.ing frequencies, swimming direction can also be altered by changing frequency-showing breakdown of Stokes law with inertia.

关键词： Very low Reynolds number flow swimming motion of bacteria dynamic mesh p.rcell’s swimmer Stokes flow

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