Initial Study of a Wire Mesh Tomography Sensor for Liquid/Gas Component Investigation

Rahiman, M.H.F.,Siow, L.T.,Rahim, R.A.,Zakaria, Z.,Ang, Vernoon The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.5

Experimental studies have been carried out to study the principle operation of the conductive type wire-mesh tomography sensor and analyse the wire-mesh tomography sensor for the liquid/gas two-phase flow interface and void fraction distribution in a process column. The measurement of the two-phase flows in the process column is based on the cross-sectional local instantaneous conductivity. The sensor consists of two planes of parallel electrode wires with 16 electrodes each and was placed orthogonally with each plane. The sensor electrode wires were made of tinned copper wire with an outer diameter of 0.91 mm which stretched over the sensor fixture. Therefore, this result in the mesh grid size with 5.53×5.53mm². The wire-mesh sensor was tested in a horizontal liquid/gas two-phase flows process column with nominal diameter of 95.6 mm and the sampling frequency of 5882.3529 Hz. The tomogram results show that the wire-mesh tomography provides significant results to represent the void fraction distribution in the process column and estimation error was found in the liquid/gas interface level

Leak Detection In Pipeline via Sliding Motion

Wan Rahiman,Zhentao Ding 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10

This paper presents the design and application of sliding motion into a circle criterion observer based for a class of uncertainty system using linear matrix inequalities (LMI). A model-based is used to detect a faulty section in pipeline systems is proposed. Fault diagnosis is accomplished by means of a bank of estimators, which provide estimates of parameters that describe plant and faulty section. Once in the appropriate form and under certain assumptions, nonlinear observer is designed for fault detection, isolation and estimation (FDIE). The simulation results show that the proposed observer works more effectively such that the threshold in the pipeline systems can be set with much larger value to avoid false alarm.

Initial Study of a Wire Mesh Tomography Sensor for Liquid/Gas Component Investigation

Mohd Hafiz Fazalul Rahiman,Siow Lean Thiam,Ruzairi Abdul Rahim,Zulkarnay Zakaria,Vernoon Ang Wei Neng 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.5

Experimental studies have been carried out to study the principle operation of the conductive type wire-mesh tomography sensor and analyse the wire-mesh tomography sensor for the liquid/gas two-phase flow interface and void fraction distribution in a process column. The measurement of the two-phase flows in the process column is based on the cross-sectional local instantaneous conductivity. The sensor consists of two planes of parallel electrode wires with 16 electrodes each and was placed orthogonally with each plane. The sensor electrode wires were made of tinned copper wire with an outer diameter of 0.91 mm which stretched over the sensor fixture. Therefore, this result in the mesh grid size with 5.53×5.53mm². The wire-mesh sensor was tested in a horizontal liquid/gas two-phase flows process column with nominal diameter of 95.6 mm and the sampling frequency of 5882.3529 Hz. The tomogram results show that the wire-mesh tomography provides significant results to represent the void fraction distribution in the process column and estimation error was found in the liquid/gas interface level.

Initial Study of a Wire Mesh Tomography Sensor for Liquid/Gas Component Investigation

M.H.F. Rahiman,L.T. Siow,Z. Zakaria,Vernoon Ang,R.A. Rahim 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.5

Experimental studies have been carried out to study the principle operation of the conductive type wire-mesh tomography sensor and analyse the wire-mesh tomography sensor for the liquid/gas two-phase flow interface and void fraction distribution in a process column. The measurement of the two-phase flows in the process column is based on the cross-sectional local instantaneous conductivity. The sensor consists of two planes of parallel electrode wires with 16 electrodes each and was placed orthogonally with each plane. The sensor electrode wires were made of tinned copper wire with an outer diameter of 0.91 mm which stretched over the sensor fixture. Therefore, this result in the mesh grid size with 5.53×5.53mm2. The wire-mesh sensor was tested in a horizontal liquid/gas two-phase flows process column with nominal diameter of 95.6 mm and the sampling frequency of 5882.3529 Hz. The tomogram results show that the wire-mesh tomography provides significant results to represent the void fraction distribution in the process column and estimation error was found in the liquid/gas interface level.

Spectroscopic, Redox and Biological Studies of Push-Pull Porphyrins and Their Metal Complexes

Rajesh, K.,Rahiman, A. Kalilur,Bharathi, K. Shanmuga,Sreedaran, S.,Gangadevi, V.,Narayanan, V. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.9

We have synthesized a series of push-pull porphyrins containing both donor and acceptor substituents at the mesopositions and have examined their spectral and biological properties. The push-pull porphyrins containing both strong donor $NH_2$ and acceptor $NO_2$ at meso-positions, in which donor group condensed with the ligand, (2,6-bis(4-methylpiperazine-1-yl-methyl)-4-formlyphenol (L) to form imine linkages with porphyrin. The Schiff base ligand 5-[4-(2,6-bis(4-methylpiperazine-1-yl-methyl)-4-iminomethylphenol)phenyl]-10,15,20-tris(4-nitrophenyl) porphyrin [$an_3$(TPP)L] can be synthesized from 2,6-bis(4-methylpiperazine-1-yl-methyl)-4-formylphenol (L) and 5-(4-aminophenyl)-10, 15,20-tris(4-nitrophenyl)porphyrin. The push-pull porphyrin [$an_3$(TPP)L] was metallated to get copper, nickel and zinc complexes. The spectral, electrochemical, antibacterial, antifungal and cytotoxicity properties of all the donor- acceptor push-pull porphyrins and their complexes were characterized and studied.

Spectroscopic, Redox and Biological Studies of Push-Pull Porphyrins and Their Metal Complexes

K. Rajesh,A. Kalilur Rahiman,K. Shanmuga Bharathi,S. Sreedaran,V. Gangadevi,V. Narayanan 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.9

We have synthesized a series of push-pull porphyrins containing both donor and acceptor substituents at the mesopositions and have examined their spectral and biological properties. The push-pull porphyrins containing both strong donor NH2 and acceptor NO2 at meso-positions, in which donor group condensed with the ligand, (2,6-bis(4-methylpiperazine-1-yl-methyl)-4-formlyphenol (L) to form imine linkages with porphyrin. The Schiff base ligand 5-[4-(2,6-bis(4-methylpiperazine-1-yl-methyl)-4-iminomethylphenol)phenyl]-10,15,20-tris(4-nitrophenyl) porphyrin [an3(TPP)L] can be synthesized from 2,6-bis(4-methylpiperazine-1-yl-methyl)-4-formylphenol (L) and 5-(4-aminophenyl)-10, 15,20-tris(4-nitrophenyl)porphyrin. The push-pull porphyrin [an3(TPP)L] was metallated to get copper,nickel and zinc complexes. The spectral, electrochemical, antibacterial, antifungal and cytotoxicity properties of all the donor- acceptor push-pull porphyrins and their complexes were characterized and studied.

Antiurolithic effect of olive oil in a mouse model of ethylene glycol-induced urolithiasis

Mohammed Alenzi,Shaik Rahiman,Bilal Ahmad Tantry 대한비뇨의학회 2017 Investigative and Clinical Urology Vol.58 No.3

Purpose: At present, commercially available antiurolithic drugs have more adverse effects than potential therapeutic or preventive effects with chronic use. With this in mind, the present study was designed to assess the antiurolithic effect of olive oil in a mouse model of ethylene glycol (EG)-induced urolithiasis. Materials and Methods: Adult albino mice were divided into 6 groups. Group I was fed the vehicle only. Group II was supplemented with 0.75% EG alone in drinking water during the experimental period to initiate deposition of calcium oxalate in kidneys, which leads to urolithiasis in animals. Groups III (olive oil control group) through V were fed olive oil orally at various doses during the experimental period. Group VI received cystone (750 mg/kg). Groups IV–VI additionally received 0.75% EG in drinking water ad libitum. SPSS ver.17.0 was used for statistical analysis. Results: The study results showed significantly higher levels of serum urea, uric acid, and creatinine (p<0.05) in group II than in groups III–VI and I. Administration of olive oil at different doses restored the elevated serum parameters in groups IV and V compared with group II. Urine and kidney calcium, oxalate, and phosphate levels in groups IV–VI were significantly lower (p<0.05) than in animals with EG-induced urolithiasis (group II). Group V mice showed a significant restoration effect on serum as well as urine and kidney parameters compared with group II. Conclusions: Supplementation with olive oil (1.7 mL/kg body weight) reduced and prevented the growth of urinary stones, possibly by inhibiting renal tubular membrane damage due to peroxidative stress induced by hyperoxaluria.

Synthesis, Antibacterial, Docking and Anticancer Evaluation of N-Substituted Benzoyl Derivatives

Arthi, P.,Shobana, S.,Srinivasan, P.,Rahiman, A. Kalilur The Basic Science Institute Chosun University 2014 조선자연과학논문집 Vol.7 No.4

A series of N-benzoylated ligands incorporating three different benzoyl groups 2,2'-(benzoyliminodiethylene)-4-substituted phenols ($L^{1,4,7}$), 2,2'-(4-nitrobenzoyliminodiethylene)-4-substituted phenols ($L^{2,5,8}$) and 2,2'-(3,5-dinitrobenzoyliminodiethylene)-4-substituted phenols ($L^{3,6,9}$) were synthesized and characterized by IR, $^1H$ NMR, $^{13}C$ NMR and mass spectroscopy. The In vitro antibacterial activity of investigated ligands were tested against human pathogenic bacteria such as four Gram (-) Enterococcus faecalis, Pseudomonas aeruginosa, Staphylococcus aureus, Vibrio cholera, Vibrio harveyi and two Gram (+) Staphylococcus aureus, Streptococcus mutans. Furthermore, docking studies were undertaken to gain insight into the possible binding mode of these compounds with the binding site of the topoisomerase II (PDB: 4FM9) enzyme which is involved in DNA superhelicity and chromosome seggregation. The N-benzoylated derivatives $L^{5,7,8}$ have significant anticancer activity as Topoisomerase inhibitors. The ligands $L^5$ and $L^8$ were tested for their anticancer activity against human liver adenocarcinoma (HepG2) cell line with the MTT assay.

A Design and Development of a Wireless Sensor Network for Potential Monitoring and Localization

Nurul Amira Mohd Ramli,Mohd Hafiz Fazalul Rahiman,Muhammad Faiz Abdul Malik,Latifah Munirah Kamarudin,Latifah Mohamed,Ammar Zakaria,Mohammed Saeed Moqbel Abdullah 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6

This paper presents an analysis of the received signal strength indicator (RSSI) from the radio frequency signals for human identifi cation in an indoor wireless sensor network (WSN). Instead of using closed-circuit television as the existing security platform, this indoor safety system was improved with a convenient, cheap, and low-power solution. The system was developed using 20 of ESP8266-12F Wi-Fi modules transmitters and another 2 of ESP8266-12F as the access points located in 3 m × 3 m area of interest. With a suitable coordinate of sensor nodes, a WSN telemetry could be established to minimize the blind spot area and limit the movement of the intruder with a minimum area of 0.2 m 2 . The RSSI measurement was repeatedly conducted for three diff erent conditions, in an empty room, with the presence of a single intruder and the presence of multiple intruders. Based on the RSSI values, we found that there are distinctive features of data that can be utilized as fl ags for classifying the three above conditions. Besides that, to justify the effi ciency of system performance, we also examined the sensitivity of RSSI values towards the variation of temperature. Our results show that the RSSI average values for both morning and night were practically the same. However, during the afternoon, the RSSI signal strength fl uctuated by − 1.0 dBm. These results motivate the development of an alarm system that only uses the RSSI statistics to detect human presence.

Template Synthesis of Polyaza Macrocyclic Copper(II) and Nickel(II) Complexes: Spectral Characterization and Antimicrobial Studies

P. Gurumoorthy,J. Ravichandran,N. Karthikeyan,P. Palani,A. Kalilur Rahiman 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.7

The template synthesis of copper(II) and nickel(II) complexes derived from 2,6-diformyl-4-methylphenol with diethylenetriamine or 1,2-bis(3-aminopropylamino)ethane produce the 12-membered N3O and 17-membered N4O macrocyclic complexes, respectively. The geometry of the complexes has been determined with the help of electronic and EPR spectroscopic values and found to be five coordinated square pyramidal and, six coordinated distorted tetragonal for 12-membered and 17-membered macrocyclic complexes, respectively. Electrochemical studies of the mononuclear N3O and N4O copper(II) complexes show one irreversible oneelectron reduction wave at Epc = –1.35 and –1.15 V respectively, and the corresponding nickel(II) complexes show irreversible one-electron reduction wave at Epc = –1.25 and –1.22 V, respectively. The nickel(II) complexes show irreversible one-electron oxidation wave at Epa = +0.84 and +0.82 V, respectively. All the complexes were evaluated for in vitro antimicrobial activity against the human pathogenic bacteria and fungi.