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Effect of equal channel angular pressing on AZ31 wrought magnesium alloys

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Journal of Magnesium and Alloys 2013年第4期1卷 336-340页

作者： Avvari Muralidhar S.Narendranath h.shivananda nayaka Mechanical Engineering Department National Institute of Technology Karnataka(NITK)SurathkalSrinivasanagarMangalore 575025KarnatakaIndia

AZ31 wrought magnesium alloys are light weight materials which play an important role in order to reduces the environmental burdens in modern society because of its high strength to weight ratio,corrosion resistance,and stiffness and *** of this material are mainly in structural component i.e.,in constructions,automobile,aerospace,electronics and marine *** the present work,the microstructure characterization of the AZ31 alloys up to four ECAP passes at temperature of 573 K was observed for route *** grain size of the material was reduced from 31.8μm to 8μm after four ECAP *** properties of the alloy improved with increase in number of ECAP ***,X-ray diffraction analysis was carried out for as received and ECAP processed material.

关键词： ECAP AZ31 alloy Grain refinement Microstructure Mechanical properties XRD

Comparative Study on Tool Fault Diagnosis Methods Using Vibration Signals and Cutting Force Signals by Machine Learning Technique

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Structural Durability & health Monitoring 2020年第2期14卷 127-145页

作者： Suhas S.Aralikatti K.N.Ravikumar hemantha Kumar h.shivananda nayaka V.Sugumaran NationalInstitute of Technology Karnataka Mangaluru575025India Vellore Institute of Technology University Chennai600127India

The state of cutting tool determines the quality of surface produced on the machined parts.A faulty tool produces poor sur face,inaccurate geometry and non-economic ***,it is necessary to monitor tool condition for *** process to have superior quality and economic *** the pre-sent study,fault classification of single point cutting tool for hard turning has been carried out by employing machine learning *** force and vibration signals were acquired to monitor tool condition during machining.A set of four tooling conditions namely healthy,worn flank,broken insert and extended tool overhang have been considered for the *** machine learning technique was applied to both vibration and cutting force *** wavelet features of the signals have been extracted using discrete wavelet trans formation(DWT).This transformation represents a large dataset into approximation coeffcients which contain the most useful information of the *** features,among features extracted,were selected using J48 decision tree ***-sification of tool conditions was carried out us ing Naive Bayes algorithm.A 10 fold cross validation was incorporated to test the validity of classifier.A comparison of performance of classifier was made between cutting force and vibration signal to choose the best signal acquisition method in classifying tool fault conditions using machine learning technique.

关键词： Fault diagnosis of cutting tool Naive Bayes classifer,decision tree technique

New records of Graphidaceae(lichenized fungi)from the Western Ghats of Kerala state,India

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Studies in Fungi 2021年第1期6卷 213-223页

作者： Biju h Sabeena A nayaka S Microbiology Division Jawaharlal Nehru Tropical Botanic Garden and Research InstitutePalodeThiruvananthapuram 695562Kerala Lichenology laboratory Plant Diversity Systematics and Herbarium DivisionNational Botanical Research InstituteLucknow 226001Uttar Pradesh

In the present paper,15 lichenized fungal species belonging to family Graphidaceae are described,of which Ocellularia albomaculata,***,***,***,*** and *** are new records to Indian lichen biota and Pallidogramme chrysenteron is new to Peninsular India,whereas Asteristion alboolivaceum,Chapsa hiata,Diploschistes rampoddensis,Fissurina rubiginosa,Pseudochapsa phlyctidioides,Thelotrema canarense,*** and *** are new to lichen biota of Kerala state.

关键词： Ascomycota Biodiversity Taxonomy

Larvicidal potential of selected indigenous lichens against three mosquito species–Culex quinquefasciatus, Aedes aegypti and Anopheles stephensi

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Chinese herbal Medicines 2018年第2期10卷 152-156页

作者： Syed Zameer Ahmed Khader Sidhra Syed Zameer Ahmed Kisore Perundurai Venkatesh Kamaraj Chinnaperumal Sanjeeva nayaka Department of Biotechnology K.S.Rangasamy College of Technology Department of Biotechnology Periyar University Indian Lichenological Society Lichenology Laboratory Plant Diversity Systematics and Herbarium Division CSIR-National Botanical Research Institute (Govt. of India)

Objective：Mosquitoes are the major transmitting vectors of serious human diseases,causing millions of deaths every year with undesirable effects,including toxicity to non-target *** plants with insecticidal properties have been used in recent years for the control of a variety of pest insects and *** the quest for alternative natural biological control agents against mosquito larvae lichens were ***：Larvicidal activity was assessed with methanolic extracts of Parmotrema reticulatum,Parmotrema kamatti,Parmotrema tinctorum,Parmelia erumpens,Leptogium papilosum,and Roccella montagnei against Aedes aegypti,Anopheles stephensi,and Culex *** standard WhO protocols with minor modifications were adopted and the bioassay was evaluated at the concentrations of 100–500μg/m L for each *** all the lichen extracts showed complete mortality against *** in100μg/m L,the concentrations were decreased to 100,50,25,12.5,and 6.25μg/m L for *** mortality was observed for 24 h after ***：All the lichen extracts exhibited activity against third instar larvae of *** and *** at 100μg/m L,and 100%mortality was observed against the vector *** at 100μg/m *** highest larvicidal activity was found with *** against ***（81.127μg/m L）and ***（89.10μg/m L）.Similarly,*** and *** when tested against *** with minimum concentration〈100μg/m L exhibited significant activity withof 5.32and 6.97μg/m ***：The bioassay results revealed larvicidal potential of lichens especially against *** with high mortality even at lower ***,lichens can be used as an ideal sustainable approach for the control of lymphatic filariasis caused by vector ***.

关键词： larvicidal lichen mortality mosquito vectors

高位胸段硬膜外麻醉下清醒病人的冠状动脉搭桥手术

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岭南心血管病杂志 2003年第4期9卷 236-239页

作者：郭惠明 Murali Chakravarthy Vivek Jawali TA Patil K Jayaprakash NV shivananda 广东省心血管病研究所心脏外科 510100 Wockhardt heart Institute

目的　了解在高位胸段硬膜外麻醉下避免全麻行非体外循环心脏跳动下冠状动脉搭桥手术的可行性。方法　硬膜外麻醉下对 2 5例清醒病人行非体外循环心脏跳动下冠状动脉搭桥手术 ,没有气管插管全麻 ,所有病人在手术前晚行硬膜外置管。结果... 详细信息

目的　了解在高位胸段硬膜外麻醉下避免全麻行非体外循环心脏跳动下冠状动脉搭桥手术的可行性。方法　硬膜外麻醉下对 2 5例清醒病人行非体外循环心脏跳动下冠状动脉搭桥手术 ,没有气管插管全麻 ,所有病人在手术前晚行硬膜外置管。结果　总共搭桥 71支 (1支 11例 ,2支 5例 ,3支 6例 ,4支 3例 )。除 1例因为术中出现室颤转为全麻和体外循环外 ,2 4例在硬外麻作为唯一麻醉下完成非体外循环心脏跳动下冠状动脉搭桥手术。除 2例行左胸小切口外其余行正中切口 ;其中 6例为再次手术 ;平均每例搭桥2 8支 ,没有手术死亡。术后在复苏室和病房住院时间分别为 (16 2± 4 2 )h和 (3 2 4± 1 2 )d。结论　本组的早期经验提示在没有气管插管全麻。

关键词：高位胸段硬膜外麻醉清醒病人非体外循环心脏跳动冠状动脉搭桥手术心脏病

米力农对一氧化氮吸入治疗效果欠佳的新生儿持续肺动脉高压的药理学作用

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中国小儿急救医学 2013年第1期 51-51页

作者： McNamara PJ shivananda SP Sahni M 杨明北京和睦家医院

背景新生儿持续肺动脉高压（persistent pulmonary hypertensionof newborn,PPhN）常见且病死率很高。一氧化氮吸入（inhaled nitric oxide,iNO）虽是标准治疗方法,但仍有40%的新生儿对其治疗无反应。米力农是一种磷酸二酯酶Ⅲ抑制剂,... 详细信息

背景新生儿持续肺动脉高压（persistent pulmonary hypertensionof newborn,PPhN）常见且病死率很高。一氧化氮吸入（inhaled nitric oxide,iNO）虽是标准治疗方法,但仍有40%的新生儿对其治疗无反应。米力农是一种磷酸二酯酶Ⅲ抑制剂,可增加环磷酸腺苷的生物利用度,动物模型实验提示用药后肺循环得到改善。目的主要研究米力农对PPhN的药理学作用,其次研究其安全性和短期预后的关系。方法在对米力农进行的开放试验研究中,PPhN患儿接受50μg/kg的负荷剂量米力农,>60 min静脉输入,再予0.33～0.99μg/（kg·min）的速度维持输液24～72h。同时记录患儿的心肺功能指标和干预措施。在给予米力农负荷剂量后以及维持剂量输液过程中,进行一系列药物浓度监测以判断稳态浓度,停止输液后监测药物浓度以判断药物清除规律。使用米力农前1 h和使用后12 h分别进行心脏超声检查。结果 11例符合PPhN诊断标准的新生儿纳入本研究。胎龄和出生体重分别为（39.2±1.3）周和（3 481±603）g。米力农平均半衰期、机体总清除率、分布容积和稳态浓度分别为（4.1±1.1）h、（0.11±0.01）L/（kg·h）、（0.56±0.19）L/kg和（290.9±77.7） ng/ml。使用米力农后PaO2改善（P=0.002）,FiO2（PhN患儿中的药代动力学规律与文献报道一致。对iNO治疗反应不佳的患儿,静脉应用米力农可提高氧合,改善肺循环和体循环的血流动力学。以上数据提示有必要对新生儿进行相关的随机对照研究。

关键词：新生儿持续肺动脉高压心肌功能磷酸二酯酶抑制剂氧合功能衰竭