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Influence of Carbon Content on strain Hardening Behaviour of sintered Plain Carbon steel Preforms

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Journal of Iron and steel Research International 2011年第9期18卷 33-40页

作者： s narayan A Rajeshkannan Mechanical Engineering The University of the South PacificLaucala Campus

Complete experimental investigation on the instantaneous strain hardening behaviour of powder metallurgy （P/M） preforms of pure iron, Fe 0.35%C, Fe-0.75%C and Fe-1.1%C was carried out. The strain hardening be haviour of the above-mentioned P/M sintered steel preforms with aspect ratio of 0.4 under triaxial stress state condition was determined by cold upsetting under nil/no and graphite lubricant conditions. The instantaneous strain hardening value （ni）, strength coefficient （Ki）, and the stress as a function of strain and densification were obtained and analyzed. Furthermore, a relation was obtained from a semi-log plot of stress against relative density and analyzed to study the hardening behaviour owing to densification as stress was a function of induced strain as well as densification in the P/M materials.

关键词： strain hardening exponent density hardening exponent strength coefficient densification triaxial stress

Workability Behaviour of Fe-C-Mo steel Preforms During Cold Forging

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Journal of Iron and steel Research International 2013年第9期20卷 126-130页

作者： s narayan A Rajeshkannan K s Pandey s shanmugam school of Engineering and Physics Faculty of ScienceTechnology and EnvironmentUniversity of South Pacific Department Metallurgical and Materials Engineering National Institute of Technology Department of Mechanical Engineering National Institute of Technology

A systematic method to construct the workability diagram for powder metallurgy （P/M） materials has been proposed. Preforms of Fe-0.8 %C, Fe-0.8% C-1% Mo and Fe-0.8 % C 2 % Mo were prepared to the relative den-sity of 0.86 with two different geometries through primary operations of P/M processes. Each sintered preform was cold upset forged with incremental compressive loading of 0.04 MN under three different lubricant conditions till a visible crack appeared at the free surface. Oyane＇s fracture criterion was used to develop a theory to study P/M prod-ucts. The least square method was used to determine the constants in fracture criteria and these equations were even- tually used to construct workability diagram. It is found that the proposed method was well in agreement with the experimental results.

关键词： workability diagram yield criterion formability

Eco-friendly reduced graphene oxide for the determination of mycophenolate mofetil in pharmaceutical formulations

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Journal of Pharmaceutical Analysis 2018年第2期8卷 131-137页

作者： Prashanth s.narayan Nagappa L.Teradal seetharamappa Jaldappagari Ashis K.satpati Department of Chemistry Karnatak University Analytical Chemistry Division Bhabha Atomic Research Centre

Graphene oxide(GO) was synthesized and characterized by scanning electron microscopy(sEM), energy dispersive X-ray spectroscopy(EDX), atomic force microscopy(AFM), X-ray diffraction(XRD), Fourier transform-infrared spectroscopy(FT-IR) and thermogravimetric analysis(TGA). GO was then electrochemically reduced and used for electrochemical study of mycophenolate mofetil(MMF). The electrochemically reduced graphene oxide(ERGO) film on glassy carbon electrode(GCE) showed enhanced peak current for electrooxidation of MMF. MMF exhibited two irreversible oxidation peaks at 0.84 V(peak a_1)and 1.1 V(peak a_2). Effects of accumulation time, pH and scan rate were studied and various electrochemical parameters were calculated. A differential pulse voltammetric method was developed for the determination of MMF in bulk samples and pharmaceutical formulations. Linear relationship was observed between the peak current and concentration of MMF in the range of 40 nM–15 μM with a limit of detection of 11.3 nM. The proposed method is simple, sensitive and inexpensive and, hence, could be readily adopted in clinical and quality control laboratories.

关键词： Mycophenolate mofetil Electroreduced graphene oxide Electrochemical sensor Analytical application

Optimization of Transducer Location for Novel Non-Intrusive Methodologies of Diagnosis in Diesel Engines

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sound & Vibration 2021年第3期55卷 221-234页

作者： s.narayan M.U.Kaisan shitu Abubakar Faisal O.Mahroogi Vipul Gupta Department of Mechanical Engineering Qassim UniversityBuraydah51452Saudi Arabia Department of Mechanical Engineering Ahmadu Bello UniversityZaria810211Nigeria Department of Mechanical Engineering Islamic University of MadinaMedina42351Saudi Arabia Department of Mechanical Engineering Indus International UniversityUna174301India

The health monitoring has been studied to ensure integrity of design of engine structure by detection,quantification,and prediction of *** detection of faults may allow the downtime of maintenance to be rescheduled,thus preventing sudden shutdown of *** cylinder pressure developed,vibrations and noise emissions data provide a rich source of information about condition of *** of vibrations and noise emissions are novel non-intrusive methodologies for which positioning of various transducers are important *** presented work shows applicability of these diagnosis methodologies adopted in case of diesel *** effects of changing various fuel injection parameters was *** of using non-intrusive technique has been analyzed by changing locations of *** of this worklies in exploring signal processing methods for various locations around the engine test set *** frequency ranges of contributing noise and vibration sources were ***-Frequency analysis showed the onset of various *** on the identification of various frequency bands,it is possible to device suitable filters in order to extract more information.

关键词： IC engines automotive vibrations and noise emissions condition monitoring specialized industrial machinery and equipment

shape Optimization and Assessment of Wind Induced stresses in Domes

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Journal of Civil Engineering and Architecture 2012年第7期6卷 925-927页

作者： K. s. Babu narayan subhash C. Yaragal Yukio Tamura Department of Civil Engineering National Institute of Technology Karnataka Mangalore 575 025 India Department of Architectural Engineering Tokyo Polytechnic University Kanagawa 243-0297 Atsugi Japan

Domes are popularly used for column free areas. They are employed as covers to reservoirs and treatment units and also as containment in nuclear reactors. Inverted domes are popular as foundations. structures are built with an intended end use for a specified utility period. The functional requirement is to serve the purpose and the structural requirement constitutes stability, strength, safety, serviceability and durability. satisfaction of these requirements at affordable costs is the goal of structural optimization. This paper demonstrates the need and scope for optimization of domes by formulating and solving the problem by use of calculus （volume of material is the objective function being minimized using first principles of calculus）. A simple but elegant method is suggested for determination of wind stresses by statics which compares very well with that obtained by rigorous method.

关键词： Dome shape wind stresses search optimization.

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中功率砷化镓肖特基势垒场效应晶体管

微纳电子技术 1976年第8期 11-15页

作者： s.Y.narayan 管丕恺

固体微波器件研究的最新和最重要的进展之一是研制出了中功率砷化镓肖特基势垒场效应晶体管（GaAsMEsFET）。RCA 的研究工作已确认此种器件可用做中功率的放大器和振荡器。我们已做出9千兆赫下,输出功率高达1瓦,功率附加效率η=(Pout-Pi... 详细信息

固体微波器件研究的最新和最重要的进展之一是研制出了中功率砷化镓肖特基势垒场效应晶体管（GaAsMEsFET）。RCA 的研究工作已确认此种器件可用做中功率的放大器和振荡器。我们已做出9千兆赫下,输出功率高达1瓦,功率附加效率η=(Pout-Pin)/Pdc为16%（线性增益为5.5分贝）的单元器件。4千兆赫下功率附加效率高达35%,9千兆赫下为21%的器件已经实现。另外,也研制出9.15千兆赫下输出功率

关键词：千兆赫频段毫瓦线性增益功率放大器功率放大电路 MEsFET 输出功率双极晶体管中功率

Polytypic transformations of aluminum hydroxide: A mechanistic investigation

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Particuology 2012年第3期10卷 359-364页

作者： Thimmasandra narayan Ramesh Centre for Advanced Materials and Department of Chemistry Tumkur University

The diffusion of ammonia vapors into a solution of aluminum nitrate or ferric nitrate results in the precipitation of their respective hydroxides and oxyhydroxides. Polymorphic phase formation of aluminum hydroxide is controlled by the rate of crystallization. The PXRD patterns of products obtained via vapor phase diffusion revealed that poorly ordered aluminum hydroxide is formed during the initial stages of crystallization. After 8 days, the formation of the bayerite phase of aluminum hydroxide was observed. Upon prolonged exposure to ammonia vapors, bayerite was transformed into gibbsite. The infrared spectrum of the product confirmed the presence of different polytypic phases of aluminum hydroxide. The results demonstrated that the crystal structure of metal hydroxides is controlled by the rate of crystallization, nature of the metal ion, site selectivity and specificity and preparative conditions.

关键词： Vapor phase diffusionAluminum hydroxideGibbsiteBayeritePolytypism

Cervical Cancer Detection Based on Novel Decision Tree Approach

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Computer systems science & Engineering 2023年第2期44卷 1025-1038页

作者： s.R.sylaja Vallee narayan R.Jemila Rose Department of Computer science and Engineering Infant Jesus College of EngineeringThoothukkudiTamilnadu628851India Department of Computer science and Engineering St.Xavier’s Catholic College of EngineeringNagercoilTamilnadu629003India

Cervical cancer is a disease that develops in the cervix’s *** cancer mortality is being reduced due to the growth of screening *** cancer screening is a big issue because the majority of cervical cancer screening treatments are ***,there is apprehension about standard screening procedures,as well as the time it takes to learn the *** are different methods for detecting problems in the cervix using Pap(Papanico-laou-stained)test,colposcopy,Computed Tomography(CT),Magnetic Reso-nance Image(MRI)and *** obtain a clear sketch of the infected regions,using a decision tree approach,the captured image has to be segmented and *** goal of creating a decision tree is to establish prediction model that anticipate the feature vector based on the input *** paper deals with investigating various techniques of segmentation for detecting the cervical *** proposes a novel method to develop an assistance system for the detection diag-nosis of cervical cancer,based on work of Martin,Byriel and *** analysis is focused on Pap smear pictures of single *** testing is a method of detecting abnormalities in the *** processing is an effective method for extracting *** is used to determine the size of cervical carcinoma and the length of the ***’s database,which is open source and utilised for analysis and valida-tion,is obtainable for research *** malignancy information utilizing three grouping strategies to anticipate the disease and afterward analyzed the out-comes showed that choice tree is the best classiﬁer indicator with the test *** investigations ought to be led to improve execution.

关键词： Cervical cancer image segmentation level set threshold watershed

The relationship between age,acceptable noise level,and listening effort in middle-aged and older-aged individuals

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Journal of Otology 2023年第4期18卷 220-229页

作者： Hemanth narayan shetty suma Raju sanjana singh s Department of Audiology JSS Institute of Speech and HearingMysuruKarnatakaIndia Department of speech-Language Pathology JSS Institute of Speech and HearingMysuruKarnatakaIndia

Objective:The purpose of the study was to evaluate listening effort in adults who experience varied annoyance towards *** and methods:Fifty native Kannada-speaking adults aged 41e68 years *** evaluated the participant's acceptable noise level while listening to ***,a sentence-final wordidentification and recall test at 0 dB sNR(less favorable condition)and 4 dB sNR(relatively favorable condition)was used to assess listening *** repeat and recall scores were obtained for each ***:The regression model revealed that the listening effort increased by 0.6%at 0 dB sNR and by 0.5%at 4 dB sNR with every one-year advancement in *** effort increased by 0.9%at 0 dB sNR and by 0.7%at 4 dB sNR with every one dB change in the value of Acceptable Noise Level(ANL).At 0 dB sNR and 4 dB sNR,a moderate and mild negative correlation was noted respectively between listening effort and annoyance towards noise when the factor age was ***:Listening effort increases with age,and its effect is more in less favorable than in relatively favorable ***,if the annoyance towards noise was controlled,the impact of age on listening effort was *** effort correlated with the level of annoyance once the age effect was ***,the listening effort was predicted from the ANL to a moderate degree.

关键词： Listening effort Acceptable noise level Cognitive reservoir Repeat and recall task