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Effects of Increasing Tungsten on Structural,Elastic and Optical Properties of xWO_3-(40-x)Ag_2O-60Te_2O Glass System

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Journal of Materials Science & Technology 2015年第1期31卷 83-90页

作者： MM.Umair A.K.Yahya M.K.Halimah H.A.A.sidek School of Physics and Materials Studies Universiti Teknologi MARA Department of Physics Faculty of ScienceUniversiti Putra Malaysia

Ternary teiiurite glasses with composition of xWO3（40-x）Ag2O-60TeO2（x=0-40 mol%） have been prepared by melt-quenching *** and optical properties of the glass system were obtained by ultrasonic velocity measurements and UV-vis spectroscopy,respectively,while structural investigation was carried out by using Raman *** longitudinal and shear velocities,vLand vsshowed large increase at x from 0 to 20 mol%before decrease with further addition of *** longitudinal modulus CLand shear modulus μ bulk modulus KeYoung’s modulus Vand Debye temperature θDshowed similar behaviors to both *** large increase of the elastic moduli at x from 0 to 20 mol%is suggested to be due to the increase in WO6octahedral unit structure indicating the increase of bridging oxygen（BO） and formation of stronger Te-O-W bonds compared to Te-O-Te *** the other hand,forx> 20 mol%,the decrease in the elastic moduli was due to the increase of non-bridging oxygen（NBO） as a result of formation of WO4tetrahedral via breaking Te-O-W *** analysis by using bulk compression and ring deformation models showed a slight decrease in the ratio of ideal bulk modulus Kbcto the experimental bulk modulus Keand average atomic ring size,/ for× 20 mol%.Our analysis also indicates that limited ring deformation took place and the main compression mechanism in this glass system was mainly ideal isotropic *** the other hand,optical band gap Eoptshowed small variation for x=0-20 mol%but decreased upon higher WO3content while refractive index n showed the opposite *** optical behavior is suggested to be related to the changes in cross link density and NBO concentration in the glass system.

关键词： Elastic moduli Optical absorption Raman spectrosco

Development of Wheel-less Snake Robot with Two Distinct Gaits and Gait Transition Capability

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International Journal of Automation and computing 2013年第6期10卷 534-544页

作者： M.H.A.Majid M.R.Khan S.N.sidek Department of Mechatronics Engineering International Islamic University Malaysia

Snake robots are mostly designed based on single mode locomotion. However, single mode gait most likely could not work effectively when the robot is subject to an unstructured working environment with different measures of terrain complexity. As a solution, mixed mode locomotion is proposed in this paper by synchronizing two types of gaits known as serpentine and wriggler gaits used for non-constricted and narrow space environments, respectively, but for straight line locomotion only. A gait transition algorithm is developed to efficiently change the gait from one to another. This study includes the investigation on kinematics analysis followed by dynamics analysis while considering related structural constraints for both gaits. The approach utilizes the speed of the serpentine gait for open area locomotion and exploits the narrow space access capability of the wriggler gait. Hence, it can increase motion flexibility in view of the fact that the robot is able to change its mode of locomotion according to the working environment.

关键词： Bio-inspired robots robotics robot dynamics robot kinematics robotic mechanical systems.

Taurine protects against retinal and optic nerve damage induced by endothelin-1 in rats via antioxidant effects

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Neural Regeneration Research 2018年第11期13卷 2014-2021页

作者： Natasha Najwa Nor Arfuzir Renu Agarwal Igor Iezhitsa Puneet Agarwal Sabrilhakim sidek Nafeeza Mohd Ismail Center for Neuroscience Research Faculty of MedicineUniversiti Teknologi MARA Sungai Buloh Campus Volgograd State Medical University Research Institute of Pharmacology Faculty of Medicine International Medical UniversityIMU Clinical School

Endothelin-1（ET-1）, a potent vasoconstrictor, is involved in retinal vascular dysregulation and oxidative stress in glaucomatous eyes. Taurine（TAU）, a naturally occurring free amino acid, is known for its neuroprotective and antioxidant properties. Hence, we evaluated its neuroprotective properties against ET-1 induced retinal and optic nerve damage. ET-1 was administered intravitreally to Sprague-Dawley rats and TAU was injected as pre-, co-or post-treatment. Animals were euthanized seven days post TAU injection. Retinae and optic nerve were examined for morphology, and were also processed for caspase-3 immunostaining. Retinal redox status was estimated by measuring retinal superoxide dismutase, catalase, glutathione, and malondialdehyde levels using enzyme-linked immuosorbent assay. Histopathological examination showed significantly improved retinal and optic nerve morphology in TAU-treated groups. Morphometric examination showed that TAU pre-treatment provided marked protection against ET-1 induced damage to retina and optic nerve. In accordance with the morphological observations, immunostaining for caspase showed a significantly lesser number of apoptotic retinal cells in the TAU pre-treatment group. The retinal oxidative stress was reduced in all TAU-treated groups, and particularly in the pre-treatment group. The findings suggest that treatment with TAU, particularly pre-treatment, prevents apoptosis of retinal cells induced by ET-1 and hence prevents the changes in the morphology of retina and optic nerve. The protective effect of TAU against ET-1 induced retinal and optic nerve damage is associated with reduced retinal oxidative stress.

关键词： endothelin-1 retina optic nerve taurine oxidative stress

The effect of nanosilica sizes in the presence of nonionic TX100 surfactant on CO_(2)foam flooding

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Petroleum Research 2022年第1期7卷 62-76页

作者： Suriatie Mat Yusuf Radzuan Junin Mohd Akhmal Muhamad sidek Muhammad AManan Mohd Fazril Irfan Ahmad Fuad Mohd Zaidi Jaafar Effah Yahya Nor Roslina Rosli Department of Petroleum Engineering School of Chemical and Energy EngineeringFaculty of EngineeringUniversiti Teknologi Malaysia81310Johor BahruMalaysia Institute for Oil and Gas Universiti Teknologi Malaysia81310Johor BahruMalaysia School of Chemical Engineering College of EngineeringUniversiti Teknologi MARA40450 Shah AlamSelangorMalaysia

The aim of this research is to study the effect of hydrophilic silica nanoparticles,sizes as CO_(2) foam stabilizer in the presence of nonionic TX100 *** nanosilica sizes,15 and 70 nm,have been examined *** of TX100 on silica nanoparticles(nanosilica)was characterized by adsorption isotherm and surface tension measurement,while CO_(2) foams stability was quantified based on their foamability,foam stability,particle partitioning in the foams,and bubble *** show that direct contact of TX100 with nanosilica does altered the wettability of hydrophilic nanosilica surface,enable them to lengthen CO_(2) foams life at certain surfactant and nanoparticles *** 15 nm nanosilica,CO_(2) foam stability shows excellent performance at 0.1 and 0.5 wt%TX100 *** for 70 nm nanosilica,CO_(2) foam demonstrates longer lifetime at much lower TX100 concentration,0.01 wt%.Without the presence of TX100,CO_(2) foams exhibit undesirable lifetime performances for both nanosilica *** partitioning in CO_(2) foams structures demonstrate consistent relation with contact angle *** bubble sizes shows insignificant effect on CO_(2) foams *** the assists of nanosilica and TX100,enhanced oil recovery via CO_(2) foam injection succeeds in increasing oil production by 13e22%of original oil-in-place(OOIP).

关键词： Nanoparticle sizes Adsorption Nonionic surfactant TX100 surfactant Foamability CO_(2)foam stability CO_(2)foam flooding EOR

Thermophysical properties of BiFeO_(3)/REE multiferroics in a wide temperature range

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Journal of Advanced Dielectrics 2020年第1期10卷 139-143页

作者： sidek Khasbulatov Suleiman Kallaev Haji Gadjiev Zairbek Omarov Abumuslim Bakmaev Iliya Verbenko Aleksey Pavelko Larisa Reznichenko Research Institute of Physics Southern Federal University 194 Stachki Avenue Rostov-on-Don 344090Russia Department of Physical Electronics Chechen State University Grozny 364015 Chechen RepublicRussia H.I.Amirkhanov Institute of Physics of Daghestanian Scientific Center of the Russian Academy of Sciences Makhachkala Russia

The paper presents the results of a comprehensive study of the thermophysical properties(thermal conductivity,thermal diffusivity,heat capacity)of high-temperature multiferroic BiFeO_(3) modified with rare-earth elements(REEs)(La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Lu).The regularities of the formation of the mentioned characteristics were *** assumptions about the nature of the observed phenomena were suggested.

关键词： Ferroelectrics multiferroics ceramics bismuth ferrite thermophysical properties

Determination of Suspended Structure in Microhotplate Using Gradient Method

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材料科学与工程（中英文版） 2010年第11期4卷 89-93页

作者： Zaini Abdul Halim Zarina Tardan Othman sidek CEDEC （Collaborative pElectronic Design Excellent Center） Universiti Sains Malaysia Nibong Tebal 14300 Pulau Pinang Malaysia School of Electrical and Electronic Engineering Universiti Sains Malaysia Nibong Tebal 14300 Pulau Pinang Malaysia

Combined laparoscopic and endoscopic method for foreign body removal from descending colon: A case report

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World Journal of Surgical Procedures 2024年第1期14卷 1-7页

作者： Khairunnisa Che Ghazali Huzairi Yaacob Ahmad Shanwani Mohamed sidek Department of Surgery Hospital Raja Perempuan Zainab IIKota Bharu 15586Malaysia

BACKGROUND The majority of published reports on foreign bodies(FBs)involve the rectum and applied a transanal ***,patients with FB above the rectum are subjected to laparotomy for ***,we illustrate the case of a man with an FB that had migrated into the descending colon,and its successful removal via a laparoscopic *** SUMMARY A 43-year-old man,who had the habit of FB insertion into his anus to aid defe-cation,presented upon experience of such an FB slipping through and migrating upward to the distal *** abdominal radiograph revealed a bottle-shaped FB,positioned in the left iliac fossa *** FB was successfully removed via a laparoscopic-assisted procedure in which we combined diagnostic laparoscopic and endoscopic techniques during *** patient was monitored for 2 d postoperatively and subsequently discharged *** A minimally invasive approach should be adopted to aid extraction of colorectal FB as it is effective and safe.

关键词： Foreign body Colorectal Laparoscopic approach Removal technique Minimally invasive Case report

Mechanical and Adhesion Properties of UV Curable Coating Based from Epoxidized Oil

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材料科学与工程（中英文B版） 2011年第4期1卷 452-456页

作者： Rahmah Mohamed Wan Aimi Zalikha Ahmad sidek Ahmad Faiza Mohd Faculty of Applied Sciences Universiti Teknologi MARA Shah Alam 40450 Selangor Malaysia

Analysis of SOI-MEMS Electrostatic Vibration Energy Harvester

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通讯和计算机（中英文版） 2012年第5期9卷 596-601页

作者： Muhamad Azman Miskam Othman sidek Mohammad Zulfikar Ishak Muhammad Afif Khalid Collaborative Microelectronic Design Excellence Centre Engineering Campus Universiti Sains Malaysia 14300 Nibong TebalPulau Pinang Malaysia