Impact of Ammonia Producing Bacillus sp. on Corrosion of Cupronickel alloy 90:10

S. Maruthamuthu,P. Dhandapani,S. Ponmariappan,배정효,N. Palaniswamy,Pattanathu K.S.M. Rahman 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.3

The objectives of the present investigation were to characterize ammonia-producing bacteria (Bacillus sp.) and study its impact on biodeterioration of cupronickel alloy 90:10. in a nitrogen free environment. It is well known that iron sulphate and molybdenum are good inhibitors when used in a cooling water system. The interactions between inhibitor and ammonia producing bacteria on the corrosion of cupronickel 90:10 were studied. The predominated ammonia producing bacteria Bacillus spp. (AG1-EU202683; AG2-EU202684; AG3-EU202685 and AG4-EU202686) were identified by 16S rRNA gene sequencing from the biofilm. These bacteria fixed with atmospheric nitrogen for their cell protein synthesis and converted into ammonia. Ammonia enhanced pH and ammonical solution were formed in the presence of Bacillus spp. which acted as an etchant. The presence of some anodic spots in the presence of bacteria was affected by ammonia and then underwent pitting corrosion. The present study reveals that Bacillus spp. encourage intergranular attack without any stress in the cooling water system. The objectives of the present investigation were to characterize ammonia-producing bacteria (Bacillus sp.) and study its impact on biodeterioration of cupronickel alloy 90:10. in a nitrogen free environment. It is well known that iron sulphate and molybdenum are good inhibitors when used in a cooling water system. The interactions between inhibitor and ammonia producing bacteria on the corrosion of cupronickel 90:10 were studied. The predominated ammonia producing bacteria Bacillus spp. (AG1-EU202683; AG2-EU202684; AG3-EU202685 and AG4-EU202686) were identified by 16S rRNA gene sequencing from the biofilm. These bacteria fixed with atmospheric nitrogen for their cell protein synthesis and converted into ammonia. Ammonia enhanced pH and ammonical solution were formed in the presence of Bacillus spp. which acted as an etchant. The presence of some anodic spots in the presence of bacteria was affected by ammonia and then underwent pitting corrosion. The present study reveals that Bacillus spp. encourage intergranular attack without any stress in the cooling water system.

Spectral characterization of a pteridine derivative from cyanide-utilizing bacterium Bacillus subtilis - JN989651

S. Durairaju Nisshanthini,Antony K. Teresa Infanta S.,Duraisamy Senthil Raja,Karuppannan Natarajan,M. Palaniswamy,Jayaraman Angayarkanni 한국미생물학회 2015 The journal of microbiology Vol.53 No.4

Soil and water samples were collected from various regionsof SIPCOT and nearby Vanappadi Lake, Ranipet, Tamilnadu,India. Based on their colony morphology and their stabilityduring subculturing, 72 bacteria were isolated, of which 14isolates were actinomycetes. Preliminary selection was carriedout to exploit the ability of the microorganisms to utilizesodium cyanate as nitrogen source. Those organismsthat were able to utilize cyanate were subjected to secondaryscreening viz., utilization of sodium cyanide as the nitrogensource. The oxygenolytic cleavage of cyanide is dependenton cyanide monooxygenase which obligately requires pterincofactor for its activity. Based on this, the organisms capableof utilizing sodium cyanide were tested for the presence ofpterin. Thin layer chromatography (TLC) of the cell extractsusing n-butanol: 5 N glacial acetic acid (4:1) revealed that10 out of 12 organisms that were able to utilize cyanide hadthe pterin-related blue fluorescent compound in the cellextract. The cell extracts of these 10 organisms were subjectedto high performance thin layer chromatography (HPTLC)for further confirmation using a pterin standard. Based onthe incubation period, cell biomass yield, peak height andarea, strain VPW3 was selected and was identified as Bacillussubtilis. The Rf value of the cell extract was 0.73 which wasconsistent with the 0.74 Rf value of the pterin standardwhen scanned at 254 nm. The compound was extracted andpurified by preparative High Performance Liquid Chromatography(HPLC). Characterization of the compound wasperformed by ultraviolet spectrum, fluorescence spectrum,Electrospray Ionization-Mass Spectrometry (ESI-MS), andNuclear Magnetic Resonance spectroscopy (NMR). The compoundis proposed to be 6-propionyl pterin (2-amino-6-propionyl-3H-pteridin-4-one).

Wind Tunnel Studies on Autonomous Hybrid VTOL UAV with Wing Morphing Technology

Raja S,Shanmugam Palaniswamy,Dwarakanathan D,Parammasivam K M 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10

CSIR-NAL has designed VTOL winged UAV to address hybrid unmanned vehicle requirements. The hybrid UAV’s aerodynamics and propulsion characteristics have been validated through wind tunnel test and to achieve better flight performance, a morphing wing technology was developed using multi-axis robotic concept. The multi axis controller was realized for the morphed wing mechanism of VTOL UAV through LMA and PID controller. The control motion simulation was performed in MATLAB. The experimental results were obtained on a typical UAV morphing wing travel in multi-axis with a dedicated test rig. The controller successfully detected the IMU sensors and adopted with APM (Autopilot mode) instrumentation, simulating the flight condition. The controller with the Robotic Coupling System for WTT was operationalized at NAL’s MART Tunnel facility. This approach generates a simple model with a relatively high degree of accuracy, which can be easily integrated on to the wind tunnel tested hybrid UAV to develop high performance all terrain capable VTOL vehicles.

Electrodeposition of WO₃ nanostructured thin films for electrochromic and H₂S gas sensor applications

Poongodi, S.,Kumar, Palaniswamy Suresh,Mangalaraj, D.,Ponpandian, N.,Meena, P.,Masuda, Yoshitake,Lee, Chongmu Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.719 No.-

<P><B>Abstract</B></P> <P>In this work, Vertically oriented WO<SUB>3</SUB> nanoflakes array films was synthesized via the template free facile electrodeposition method at room temperature. WO<SUB>3</SUB> nanoflakes arrays was adopted as an effective cathode electrode material in the electrochemical devices structure. The WO<SUB>3</SUB> material exhibits superior electrochromic performance shows a larger optical modulation (68.89% at 550 nm), faster response time (t<SUB>b</SUB> = 1.93 s, t<SUB>c</SUB> = 2.87 s), a higher coloration efficiency of about 154.93 cm<SUP>2</SUP> C<SUP>−1</SUP> and with excellent cyclic stability over 2000 cycles without any degradation. Futhermore, WO<SUB>3</SUB> nanoflakes array film was used for the detection of H<SUB>2</SUB>S gas that showed excellent response. A considerable increase in porosity and high surface roughness could be conducive for such an excellent and superior electrochromic characteristic as well as gas sensing performances. These results indicates that fabricated WO<SUB>3</SUB> nanoflakes array film by a simple strategy holds a great promise for potential multifunctional applications such as smart windows, gas sensors and optical sensors.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Enhanced sensing performance of bimetallic Al/Ag-CNF network and porous PDMS-based triboelectric acetylene gas sensors in a high humidity atmosphere

Uddin, A.S.M. Iftekhar,Kumar, Palaniswamy Suresh,Hassan, Kamrul,Kim, Hyeon Cheol Elsevier 2018 Sensors and actuators. B Chemical Vol.258 No.-

<P><B>Abstract</B></P> <P>We report a self-powered active gas sensor that can detect acetylene (C<SUB>2</SUB>H<SUB>2</SUB>) reliably and accurately by measuring the output voltages generated during contact electrification between bimetallic Al/Ag-carbon nanofiber (CNF) network and porous PDMS friction surfaces. Upon exposure to certain concentrations of C<SUB>2</SUB>H<SUB>2</SUB>, the triboelectric charging behavior of the sensor is altered due to a surface reaction between C<SUB>2</SUB>H<SUB>2</SUB> molecules and the Al/Ag-CNF friction layer. The sensor exhibits excellent sensitivity of 83% and a quick response time of 88s to C<SUB>2</SUB>H<SUB>2</SUB> gas at a concentration of 1000ppm. Importantly, the friction surfaces exhibit high hydrophobicity, which preferentially minimizes the influence of humidity and provides superior sensing performance even in a high humidity atmosphere (∼87% relative humidity). We believe that the proposed approach for harvesting energy and sensing can be advantageous in practical applications and will stimulate new research for the development of high performance, precise, reliable, and durable self-powered active gas sensors that can operate in hostile environments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple fabrication of highly porous PDMS friction film and sensor device. </LI> <LI> Highly hydrophobic triboelectric friction layers offered less humidity effect. </LI> <LI> Enhanced acetylene gas sensing functionality using triboelectrification effects. </LI> <LI> Improved sensor reliability and durability. </LI> </UL> </P>

Adaptive Firefly Algorithm based OPF for AC/DC Systems

Babu, B. Suresh,Palaniswami, S. The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.4

Optimal Power Flow (OPF) is an important operational and planning problem in minimizing the chosen objective functions of the power systems. The recent developments in power electronics have enabled introduction of dc links in the AC power systems with a view of making the operation more flexible, secure and economical. This paper formulates a new OPF to embrace dc link equations and presents a heuristic optimization technique, inspired by the behavior of fireflies, for solving the problem. The solution process involves AC/DC power flow and uses a self adaptive technique so as to avoid landing at the suboptimal solutions. It presents simulation results of IEEE test systems with a view of demonstrating its effectiveness.

An Authenticated Privacy Preserving Multiword Data Retrieval over Encrypted Cloud

M. Newlin Rajkumar,S. Palaniswami,V. Venkatesa Kumar,V. Durga Shankar 한국산업정보학회 2014 한국산업정보학회 학술대회논문집 Vol.2014 No.1

Cloud Computing, the long term goal of utility computing has transformed the IT industry a lot. Data constantly contain sensitive information should be secured by policies and regulation defined by various organizations. However, information on cloud always causes privacy problems. Data encryption protects privacy and confidentiality but efficiency is not ensured. Symmetric Searchable Encryption (SSE) and Order Preserving Encryption (OPE) inevitably leaks the data and cloud users arc not authorized by the cloud. We propose, Trusted Centre Searchable Encryption (TCSE) which support multi keyword retrieval and user authentication. In TCSE, we employ a vector space model. Homomorphic encryption and a trusted center. The vector space model provides efficiency in accurate searching, homomorphic encryption involves in reducing computation cost and trusted center ensures access control in the cloud. Our approach guarantees practical efficiency for authentication and high security by eliminating data outflow.

Adaptive Firefly Algorithm based OPF for AC/DC Systems

B. Suresh Babu,S. Palaniswami 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.4

Optimal Power Flow (OPF) is an important operational and planning problem in minimizing the chosen objective functions of the power systems. The recent developments in power electronics have enabled introduction of dc links in the AC power systems with a view of making the operation more flexible, secure and economical. This paper formulates a new OPF to embrace dc link equations and presents a heuristic optimization technique, inspired by the behavior of fireflies, for solving the problem. The solution process involves AC/DC power flow and uses a self adaptive technique so as to avoid landing at the suboptimal solutions. It presents simulation results of IEEE test systems with a view of demonstrating its effectiveness.