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Identification of thermal front dynamics in the northern Malacca Strait using ROMS 3D-model

Journal of Oceanology and Limnology 2024年第1期42卷 41-57页

作者： Ku Nor Afiza Asnida Ku MANSOR nur hidayah roseli Poh Heng KOK Fariz Syafiq Mohamad ALI Mohd Fadzil Mohd AKHIR Institute of Oceanography and Environment Universiti Malaysia TerengganuKuala Nerus 21030Malaysia Faculty of Science and Marine Environment Universiti Malaysia TerengganuKuala Nerus 21030Malaysia

The thermal front in the oceanic system is believed to have a significant effect on biological *** an era of climate change,changes in heat regulation between the atmosphere and oceanic interior can alter the characteristics of this important *** the simulation results of the 3D Regional Ocean Modelling System(ROMS),we identified the location of thermal fronts and determined their dynamic variability in the area between the southern Andaman Sea and northern Malacca *** Single Image Edge Detection(SIED)algorithm was used to detect the thermal front from model-derived *** show that a thermal front occurred every year from 2002 to 2012 with the temperature gradient at the location of the front was 0.3°C/*** to the years affected by El Ni?o and negative Indian Ocean Dipole(IOD),the normal years(e.g.,May 2003)show the presence of the thermal front at every selected depth(10,25,50,and 75 m),whereas El Ni?o and negative IOD during 2010 show the presence of the thermal front only at depth of 75 m due to greater warming,leading to the thermocline deepening and enhanced *** May 2003,the thermal front was separated by cooler SST in the southern Andaman Sea and warmer SST in the northern Malacca *** higher SST in the northern Malacca Strait was believed due to the besieged Malacca Strait,which trapped the heat and make it difficult to release while higher chlorophyll a in Malacca Strait is due to the freshwater conduit from nearby rivers(Klang,Langat,Perak,and Selangor).Furthermore,compared to the southern Andaman Sea,the chlorophyll a in the northern Malacca Strait is easier to reach the surface area due to the shallower thermocline,which allows nutrients in the area to reach the surface faster.

关键词： regional ocean modelling system thermal front Andaman Sea Malacca Strait single image edge detection algorithm

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Temperature variability caused by internal tides in the coastal waters of east coast of Peninsular Malaysia

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Acta Oceanologica Sinica 2019年第1期38卷 22-31页

作者： nur hidayah roseli Mohd Fadzil Akhir Institute of Oceanography and Environment Universiti Malaysia Terengganu

The effects of tidal currents(i.e., barotropic and internal tides) are important in the biogeochemistry of a coastal shelf sea. The high-frequency of currents and near-bottom temperatures collected in three consecutive southwest monsoon seasons(May, June, July and August of 2013 until 2015) is presented to reveal the role of the tidal currents to the temperature variability in the coastal shelf sea of the east coast of Peninsular Malaysia(ECPM),south of the South China Sea(SCS). The results of a spectral density and harmonic analysis demonstrate that the near-bottom temperature variability and the tidal currents are influenced by diurnal(O_1 and K_1) and semidiurnal(M_2) tidal currents. The spectral density of residual currents(detided data) at 5, 10 and 16 m depth also shows significant peaks at the diurnal tidal frequency(K_1) and small peaks at the semidiurnal tidal frequency(M_2)indicating the existence of internal tides. The result of the horizontal kinetic energy(HKE) shows a strong intermittent energy of internal tides in the ECPM with the strongest energy is found at 16 m depth during a sporadic cooling event in June and July. A high horizontal cross-shore heat flux(16 m) also indicates strong intrusions of cooler water into the ECPM in June and July. During the short duration of cold pulse water observed in June and July, a cross-wavelet analysis also reveals the strong relationship between the near-bottom temperatures and the internal tidal currents at the diurnal tidal frequency. The intrusion of this cooler water is probably related to the monsoon-induced upwelling in June. It is loosely interpreted that the interaction between the strong barotropic tides and the steep slope in the central basin of the SCS under the stratified condition in southwest monsoon has generated these internal tides. The dissipation of internal tides from the slope area probably has driven the cold-upwelled water into the ECPM coastal shelf sea when the upwelling intensity is th

关键词： east coast of Peninsular Malaysia South China Sea barotropic tidal currents internal tides nearbottom temperature coastal shelf sea

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Water Mass Characteristics and Stratification at the Shallow Sunda Shelf of Southern South China Sea

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Open Journal of Marine Science 2015年第4期5卷 455-467页

作者： nur hidayah roseli Mohd Fadzil Akhir Mohd Lokman Husain Fredolin Tangang Azizi Ali Institute of Oceanography and Environment Universiti Malaysia Terengganu Kuala Terengganu Malaysia Research Centre for Tropical Climate Change System National University of Malaysia Bangi Malaysia

CTD data obtained from two oceanographic cruises during June and October 2012 were used to define the water mass characteristics and degree of stratification at the shallow Sunda shelf located at the southern South China Sea. The water masses during both cruises showed characteristics similar (southwest monsoon) to those observed in the adjacent regions. A clustering method was used in which three water masses were classified from the composite dataset. There are WM1 (T 29°C - 31°C, S 32 - 33.5 psu, & σT, ~19.5 - 20.7 kg/m3), WM2 (T 25°C - 29°C, S 32.8 - 33.8 psu, & σT, ~22.3 - 23 kg/m3) and WM3 (T 23°C - 25°C, S33.5 - 34.0, & σT ~22.3 - 23.3 kg/m3). Even though the water masses found were characterized under southwest monsoon characteristics, the degrees of stratification obtained varied between these cruises. The stability of the stratification also plays roles in the distribution of the water masses in the water column. WM2 was found in thermocline layer and most dominant in June compared to in October. In June, WM3 was found under the thermocline layer and absent in October. The stable thermocline caused the denser WM3 cannot mixed with WM2. Higher temperatures and weaker winds during June may have caused the strong stratification, while decreasing temperature and stronger winds of an upcoming northeast monsoon enhanced the vertical mixing during October.

关键词： Water Masses Stratification Brunt-Vaisala Frequency Sunda Shelf South China Sea

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Proapoptotic activities of Oroxylum indicum leave extract in HeLa cells

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Asian Pacific Journal of Tropical Biomedicine 2019年第8期9卷 339-345页

作者： nurul hidayah Wahab nur Afina Mohd Din Yee Ying Lim Noor Izani Noor Jamil Nor Fazila Che Mat School of Health Sciences Health Campus Universiti Sains Malaysia

Objective: To examine the proapoptotic properties of Oroxylum indicum methanol extract on cervical cancer cells. Methods: Methylene blue assay was used to determine the IC50 value of the extract. Western blotting assays were done to analyze the expression of HPV oncoproteins (HPV18 E6 and E7) and apoptotic molecules (caspase-3 and caspase-8). Reverse transcriptase PCR assays were performed to determine genetic alteration of tumor suppressors p53 and pRb and apoptosis markers Fas and FasL. Enzyme-linked immunosorbent assay (ELISA) was done to determine the expression of cytokine levels (IL-6 and IL-12). Results: The determination of IC50 value indicated a higher anti-proliferative activity of the extract compared to cisplatin. After 24 hours of treatment, Western blot analysis showed that treated HeLa cells exhibited a significant down-regulation of HPV18 oncoproteins E6 and E7, and a significant induction of caspase-8 and caspase-3 activation level. Meanwhile, the mRNA expressions of p53, pRb, Fas and FasL were significantly upregulated in treated cells. Moreover, ELISA showed an increased IL-12 and decreased IL-6 production after Oroxylum indicum treatment. Conclusions: The methanol extract of Oroxylum indicum has an anti-proliferative activity and proapoptotic potential. It induces localized-immunity improvements by altering cytokine production in HPV-positive cervical cancer cells.

关键词： Oroxylum indicum Proapoptotic Anti-proliferative HeLa cells

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Non-Isothermal Crystallization Kinetics of a Rapidly Solidified as-Cast TiZrHfNiCu High Entropy Bulk Metallic Glass

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World Journal of Engineering and Technology 2020年第3期8卷 280-295页

作者： Norhuda hidayah Nordin Faiz Syazwan Mohamad nur Ayuni Jamal International Islamic University Malaysia Selangor Malaysia

This paper aims to investigate the thermal behavior and crystallization kinetics of TiZrHfNiCu high entropy bulk metallic glass (HE-BMG) alloy using the standard procedure of Differential Scanning Calorimetric (DSC) annealing technique. The alloy was produced using an arc melting machine with a critical diameter of 1.5 mm. The crystallization kinetics and phase transformation mechanism of TiZrHfNiCu HE-BMG was investigated under the isochronal condition at a single heating run based on the Johnson-Mehl- Avrami (JMA) theory. In isochronal heating, the apparent activation energy for glass transition and crystallization events was analyzed by Kissinger and Ozawa methods. The average activation energy value for crystallization of TiZrHfNiCu amorphous alloys in isochronal modes was 226.41 kJ/mol for the first crystallization and 297.72 kJ/mol for second crystallization stages. The crystallization mechanism of the first step was dominated by two- and three-dimensional growth with increasing nucleation rate, while the crystallization mechanism in the second stage was dominated by two-dimensional crystallization growth with a constant nucleation rate. The diffusion mechanism result proved the theory of sluggish atomic diffusion of HEA at elevated temperature.

关键词： Crystallization Kinetics High Entropy Bulk Metallic Glass Phase Transformation Sluggish Diffusion

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A review of gynogenesis manipulation in aquatic animals

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Aquaculture and Fisheries 2022年第1期7卷 1-6页

作者： hidayah Manan A.B.Noor Hidayati nur Aina Lyana Adnan Amin-Safwan Hongyu Ma Nor Azman Kasan Mhd Ikhwanuddin Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and FisheriesUniversiti Malaysia Terengganu21030 Kuala NerusTerengganuMalaysia Institute of Biological Science Faculty of ScienceUniversity of MalayaKuala Lumpur50603Malaysia Guangdong Provincial Key Laboratory of Marine Biotechnology Shantou UniversityShantou515063China STU-UMT Joint Shellfish Research Laboratory Shantou UniversityShantou515063China

Gynogenesis is an established technique to generate all female type offspring and this technique has been successfully induced diploid gynogens progeny in aquatic animals of fishes and *** culture of all female shrimp and fishes were selected attribute to all female type offspring which have better size than male and help increase the market size and *** article discusses on the protocol applied to produce gynogens progeny and the successful rate of gynogenesis production in fishes,molluscs and aquatic crustaceans of shrimps in *** most of the UV length applied for irradiated the sperm were around 254-365 nm for(20-40 s),(20-80 s)and(5-8 s)for shrimps,254 nm,30 s for molluscs species and for fishes were around 254 nm for(1.5min)and(2-12 min)time of exposure *** gynogenesis induction,the fertilized eggs were treated with cold shock,heat shock or cytochalasin-B for both shrimp and fishes gynogens *** rate was identified around 4.33%-19.67%in *** hatching rate was identified around 3.0%,14.9%-37.2%of gynogens offspring in shrimp and various percentages of hatching rates were identified from each species of fish ***,there is still low survival rate of gynogens produced using gynogenesis technique and further study should be carried out to improve the gynogens *** discussed protocols serve as a guide lines for the gynogenesis technique application of all female monosex culture in the future.

关键词： UV-Length Irradiated sperm Fertilized eggs Hatching rate Survival rate Gynogens

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Gross Pollutants Study in Urban Areas under Tropical Climates

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Journal of Civil Engineering and Architecture 2014年第1期8卷 107-114页

作者： Lariyah Mohd Sidek hidayah Basri Mohamed roseli Zainal Abidin Lira Chow Hock Md Nasir Md Nor Nor Azazi Zakaria Centre for Sustainable Technology and Environment (CSTEN) College of Engineering Universiti Tenaga Nasional Kajang43000 Malaysia Drainage and Irrigation Department Humid Tropics Centre Kuala Lumpur Kuala Lumpur 50480 Malaysia Drainage and lrrigation Department River Basin & Coastal Zone Management Kuala Lumpur 50626 Malaysia River Engineering and Urban Drainage Centre (REDAC) Universiti Sains Malaysia Nibong Tebal 14300 Malaysia

Gross pollutants are the primary targeted pollutants in urban catchment management for urban water quality improvement as well as mitigation of flood. Apart from aesthetically unattractive because of its visibility, gross pollutants also contributes to degradation of river water quality and loss of aquatic habitat as it carries harmful pollutants such as oxygen demanding material, hydrocarbons and heavy metals. This study analyzed trend of gross pollutant generated from two urban residential areas located in Selangor, Malaysia. The median value of gross pollutant load obtained fi＇om the Amanah Apartment and Bandar Botanic are 347.41 kg/ha/year and 32.46 kg/ha/year, respectively. Relationship between gross pollutant wet load with rainfall depths was derived using regression equation. A significant trend of increasing gross pollutant wet load into drainage system with increasing rainfall depth was observed. The behavior of pollutant load is related to the one observed in Australia.

关键词： Gross pollutant load urban stormwater quality urban stormwater management.

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Photonic cavity enhanced high-performance surface plasmon resonance biosensor

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Photonics Research 2020年第4期8卷 448-456页

作者： GUI-SHI LIU XIN XIONG SHIQI HU WEICHENG SHI YAOFEI CHEN WENGUO ZHU HUADAN ZHENG JIANHUI YU nur hidayah AZEMAN YUNHAN LUO ZHE CHEN Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan UniversityGuangzhou 510632China Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China Key Laboratory of Visible Light Communications of Guangzhou Jinan UniversityGuangzhou 510632China Photonics Technology Laboratory Centre of Advanced Electronic and Communication EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600 UKM BangiSelangorMalaysia

Herein we propose a novel strategy to enhance surface plasmon resonance(SPR)by introducing a photonic cavity into a total-internal-reflection *** photonic cavity,which is comprised of a highly reflective photonic crystal(PC),defect layers,and a gold(Au)film,enables Fabry–Perot(FP)resonances in the defect layers and therefore narrows the SPR resonance width in the metallic surface as well as increases the electric field intensity and penetration depth in the evanescent *** fabricated sensor exhibits a 5.7-fold increase in the figure of merit and a higher linear coefficient as compared with the conventional Au-SPR *** demonstrated PC/FP cavity/metal structure presents a new design philosophy for SPR performance enhancement.

关键词： Photonic cavity enhanced high-performance surface plasmon resonance biosensor

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Physico-Chemicals Characterization of Quercetin from the <i>Carica papaya</i>Leaves by Different Extraction Techniques

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Open Journal of Physical Chemistry 2021年第3期11卷 129-143页

作者： Muhammad Hidhir Khawory Mohd Ferdaues Mohd Subki Mohd Anuar Shahudin nurul Hidayatul Afifah Saufi Sofian nur hidayah Latif nurul Hanim Salin Siti Zuraidah Mohamad Zobir Mohamed Ibrahim Noordin Malaysian Institute of Pharmaceutical and Nutraceutical (IPharm) Pulau Pinang Malaysia National Institutes of Biotechnology Malaysia (NIBM) Selangor Malaysia PICOMS International University College Kuala Lumpur Malaysia

Carica papaya leaf extracts from four different extraction methods (cold-water, hot-water, sonication and supercritical fluid), were characterized using physico-chemical analysis. Sonication extraction showed the highest percentage yield of crude extracts (6.76%) and the lowest from the supercritical fluid extraction (1.83%). The Infrared (IR) spectrum of cold-water extract demonstrated the most similarity of functional group to quercetin. Likewise, the thermal analysis indicated that cold-water extract gave a quite similar Endothermic peak to quercetin with the obtained value which was 137°C and onset value which was 118°C. The liquid chromatography (LC) profile indicated that only the cold-water extract exhibited 0.203 ppm of quercetin.

关键词： Carica papaya Extraction Infrared Liquid Chromatography Thermal Analysis

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Blockchain Governance: The Development and Application of a Framework for Waqf Institutions

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现代会计与审计:英文版 2023年第3期19卷 53-72页

作者： Khairil Faizal Khairi nur hidayah Laili Azuan Ahmad Universiti Sains Islam Malaysia NilaiMalaysia

The effectiveness of waqf administration is impeded by poor management of assets,opacity,and unstandardized *** is expected to solve these issues due to its ability to record and trace every transaction,allowing administrators to discharge their accountability to waqf *** there have been numerous proposals for waqf blockchain,there is no explicit framework for the governance of blockchain in waqf *** propose a governance of blockchain framework for waqf institutions based on IT governance dimensions and blockchain governance dimensions from the *** framework comprises three dimensions(formation and context,actors,and means of governance/decision making)that subsume eight sub-dimensions across three layers and three *** then apply the framework on a blockchain-based waqf organization to examine its *** framework is among the first to be designed for waqf institutions.

关键词： blockchain governance governance of blockchain framework waqf institutions

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