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A wavelet transform method for studying the energy distribution characteristics of microseismicities associated rock failure

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第6期6卷 631-646页

作者： Yumei Kang Hongyuan Liu md maniruzzaman a.aziz Khairul Anuar Kassim College of Resources and Civil Engineering Northeastern UniversityShenyang 110004China School of Engineering University of TasmaniaHobartTAS 7001Australia Faculty of Civil Engineering Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia

Microseismicity signals released during rock failure process are firstly recorded using microseismicity monitoring system.A wavelet transform scheme is then developed on the basis of the discrete wavelet transform and implemented into MATLAB to study the energy distribution characteristics of the monitored microseismicity *** wavelet transform scheme decomposes the recorded microseismicity signals into various wavelets at seven scales and eight frequency *** microseismicity energy at each frequency band is then calculated by integrating the wavelets in each *** is found that,for the microseismicity signals recorded during the uniaxial loading of the granite,the microseismicity energies are mainly distributed between the bands 7.8125-15.625 kHz,15.625-31.250 kHz and 31.25-62.5 kHz and the percentages of the released energies at these frequency bands are 8.24%,62.72%,28.08% of the total energies,*** results reveal that the microseismicity energies at these levels are directly related to the damage mechanisms of the granite although further studies are need to identify the failure *** these monitored signals were processed using wavelet transformation to find out the frequency distribution rule and the frequency band energy varying rule of the acoustic emission(AE) signals during the different rock damage and failure *** rock failure mechanism was interpreted from the perspective of the relationship between AE signal frequency change and crack *** frequency band energy distribution histograms of the microseismicity signals at different damage stages were computed and drawn by the energy calculation method of wavelet transformation implemented into *** energy percentage of the low frequency band(d7-a7) and that of the dominated frequency band(d4-d6) and their variation rule were analyzed ***,the critical damage point is that the low frequency energy percentage is above a certain threshol

关键词： Microseismicity signal Rock fracture Wavelet transform Band energy Grack

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Qualitative phytochemical screening and evaluation of anti-inflammatory, analgesic and antipyretic activities of Microcos paniculata barks and fruits

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Journal of Integrative Medicine 2015年第3期13卷 173-184页

作者： md.Abdullah aziz Department of Pharmacy Stamford University Bangladesh

OBJECTIVE： The main objectives of this study were to qualitatively evaluate the profile of phytochemical constituents present in methanolic extract of Microcos paniculata bark（BME） and fruit（FME）, as well as to evaluate their anti-inflammatory, analgesic and antipyretic ***： Phytochemical constituents of BME and FME were determined by different qualitative tests such as Molisch’s test, Fehling’s test, alkaloid test, frothing test, Fe Cl3 test, alkali test, Salkowski’s test and Baljet test. The anti-inflammatory, analgesic and antipyretic activities of the extracts were evaluated through proteinase-inhibitory assay, xylene-induced ear edema test, cotton pellet-induced granuloma formation in mice, formalin test, acetic acid-induced writhing test, tail immersion test and Brewer’s yeastinduced pyrexia in ***： M. paniculata extracts revealed the presence of carbohydrates, alkaloids, saponins, tannins, flavonoids and triterpenoids. All of the extracts showed significant（P〈0.05, vs aspirin group） proteinaseinhibitory activity, whereas the highest effect elicited by plant extracts was exhibited by the BME（75.94% proteinase inhibition activity） with a half-maximal inhibitory concentration（IC50） of 61.31 μg/m L. Each extract at the doses of 200 and 400 mg/kg body weight showed significant（P〈0.05, vs control） percentage inhibition of ear edema and granuloma formation. These extracts significantly（P〈0.05, vs control） reduced the paw licking and abdominal writhing of mice. In addition, BME 400 mg/kg, and FME at 200 and 400 mg/kg showed significant（P〈0.05, vs control） analgesic activities at 60 min in the tail immersion test. Again, the significant（P〈0.05, vs control） post-treatment antipyretic activities were found by BME 200 and 400 mg/kg and FME 400 mg/kg ***： Study results indicate that M. paniculata may provide a source of plant compounds with anti-inflammatory, analgesic and antipyretic activities.

关键词： phytochemical screening agents,anti-inflammatory analgesics antipyretic agents Microcos paniculata medicine,herbal

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Approach for Grid Connected PV Management:Advance Solar Prediction and Enhancement of Voltage Stability Margin Using FACTS Device

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Journal of Electronic Science and Technology 2020年第4期18卷 367-377页

作者： md.Masum Howlader Mohammad Rokonuzzaman md Tanbhir Hoq aziz Un Nur Ibn Saif md Shahrukh Adnan Khan Mahfuj Howlader Department of Electrical and Electronic Engineering University of Asia PacificDhaka 1205 Tyndall National Institute University College CorkCork T12 K8AF School of Science and Engineering Canadian University of BangladesDhaka 1212 Department of Computer Science and Engineering University of DhakaDhaka 1000

The uncertainty in solar energy is different from conventional,dispatchable generation fuels and difficult to incorporate into the standard system operating *** the first part of this work,the machine learning algorithm is used to train models based on solar irradiance data and different meteorological weather information to predict the solar irradiance for different cities to validate the forecasting ***,the intermittent and inertialess nature of photovoltaic(PV)systems can produce significant power oscillations that can cause significant problems with dynamic stability of the power system and also limit the penetration capacity of PV into the *** the second part,it is shown that the residue-based power oscillation damping(POD)controller obviously improves the inter-area oscillation *** validity and effectiveness of the proposed controller are demonstrated on the three-machine two-area test system that combines the conventional synchronous generator and flexible alternating current transmission systems(FACTS)device using *** report overall puts an in-depth analysis with regard to the challenges of solar resources with integrating,planning,operating,and particularly the stability of the rest of the power grid,including existing generation resources,customer requirements,and the transmission system itself that will lead to an improved decision making in resource allocations and grid stability.

关键词： Renewable energy(RE) support vector regression thyristor controlled series capacitor

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An IoT Based Crop Field Controlling and Monitoring System

An IoT Based Crop Field Controlling and Monitoring System

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作者： md ISRAQ aziz 华南理工大学

学位级别：硕士

A majority of the population of developing countries is associated with agriculture directly or *** liaison of engineering technology and Sustainable Development Goals(SDGs)can build a bridge for farmers to enhance their skills regarding advancements through future generation agriculture *** next-generation trends include better soil preparation,intelligent irrigation systems,advanced methods of crop nutrient inspection,smart fertilizers applications,and multi-cropping *** work proposes an embedded system which is closely monitored and controlled the climate parameters such as humidity,temperature,p H,water drainage,water supply on wireless sensor network on a regular basis round the clock for cultivation of crops which could maximize their production was *** paper also includes a smart Decision Support System(DSS)that acquires the input parameters based on real-time monitoring to optimize the yield that realizes sustainability by improving per hectare production and lessening water seepage wastage in *** designed system comprises beside the sensors from microcontroller,monitor,wireless communication based on Node MCU,respondents such as water pump,electricity supply,cloud employing decision support layers,and networking based DSS to recommend cautions for optimum sustainable *** intelligent sensors module contains a temperature and humidity sensor,p H sensor,soil moisture sensor,light intensity sensor,and gas detection sensor to transmit the statistics to the cloud over the internet via Long Range(Lo Ra)using Serial Peripheral Interface(SPI)communication ***,an android application has been developed for real-time data monitoring according to node information(accessed remotely)and a website using Firebase to store historical data and show real-time *** a low cost and flexible system can be empowered by a reliable management scenario in order to maintain the field environmental conditions.

关键词： IoT Sensor Gateways Cloud Actuator

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Absence of postzygotic isolating mechanisms:evidence from experimental hybridization between two species of tropical sea urchins

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第10期13卷 797-810页

作者： M.Aminur RAHMAN Tsuyoshi UEHARa.aziz ARSHAD Fatimah md.YUSOFF Mariana Nor SHAMSUDIN Laboratory of Marine Biotechnology Institute of BioscienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Chemistry Biology and Marine ScienceFaculty of ScienceUniversity of the Ryukyus1 SenbaruNishihara-choOkinawa 903-0213Japan Department of Aquaculture Faculty of AgricultureUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia

Two reef margin species of tropical sea urchins,Echinometra sp.C(Ec) and Echinometra oblonga(Eo),occur sympatrically on Okinawa intertidal reefs in southern *** between these species was examined through a series of cross-fertilization *** limited sperm concentrations,where conspecific crosses reached near 100% fertilization,both heterospecific crosses showed high fertilization rates(81%-85%).The compatibility of the gametes demonstrated that if gamete recognition molecules are involved in fertilization of these species,they are not strongly *** found that conspecific crosses reached peak fertilization levels much faster than did heterospecific crosses,indicating the presence of a prezygotic barrier to hybridization in the *** survival,metamorphosis,and juvenile and adult survival of hybrid groups were nearly identical to those of their parent *** from crosses in both directions developed normally through larval stages to sexually mature adults,indicating that neither gametic incompatibility nor hybrid inviability appeared to maintain reproductive isolation between these *** adults,Ec×Ec crosses gave the highest live weight,followed by Eo(ova)×Ec(sperm),Ec(ova)×Eo(sperm),and Eo×*** growth performance measures(viz.,test size,Aristotle's lantern length,and gonad index) of hybrid groups and their parental siblings showed the same *** phenotypic color patterns of the hybrids were closer to the maternal coloration,whereas spine length,tube-foot and gonad spicule characteristics,pedicellaria valve length,and gamete sizes showed intermediate *** F 1 hybrids were completely fertile and displayed high fertilization success in F 1 backcrosses,eliminating the likelihood that hybrid sterility is a postzygotic mechanism of reproductive ***,intensive surveys failed to find hybrid individuals in the field,suggesting the lack or rarity of natural *** stron

关键词： Sea urchins Echinometra Hybridization Gamete compatibility Reproductive isolation Speciation

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Green Lignosulphonate as co-surfactant for wettability alteration

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Petroleum Research 2020年第2期5卷 154-163页

作者： Zhe Qin Lim Nabilla Afzan Abdul aziz Ahmad Kamal Idris Nur Asyraf md Akhir Center of Research of Enhanced Oil Recovery Universiti Teknologi PETRONAS32610Seri IskandarPerakMalaysia Universiti Teknologi Malaysia 81310SkudaiJohor BahruMalaysia

Surfactant flooding is one of the common tertiary method to recover remaining oil in the reservoir, byreducing the interfacial tension (IFT) between two immiscible fluids nevertheless, current surfactantforms emulsion and difficult to achieve ultra-low IFT between the water and oil without addition of cosurfactant. In this research, two types of anionic lignosulphonate-based surfactants, Sodium Lignosulphonate (SLS) and Calcium Lignosulphonate (CLS) are chosen as co-surfactant. The main surfactantused in this project is the common anionic surfactant, Sodium Dodecyl Sulfate (SDS) at a fixed concentration of 4 mmol/l. Each type of co-surfactant with different concentrations (0.5%, 1.0%, 1.5% and2.0 wt %) was mixed with 4 mmol/L of SDS at each test tube to create the surfactant solution. The result ofthe experiment showed that at 0.5 wt % for SLS and CLS surfactant solution, the contact angle of oil tosurface lowered down with a reduction of 6° and 7° respectively. This indicate that the system will bemore water-wet which the oil droplet will be less adhesive to the rock surface. In conclusion, by using theoptimum concentration of 0.5 wt % lignosulphonate as co-surfactant is able to alter the wettability ofrocks and it is recommended to test the biological-based co-surfactant at increasing temperature as analternative to enhance the surfactant flooding performance which improves the oil recovery.

关键词： Biosurfactant Co-surfactant Wettability Microemulsion Water-wet

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Effect of the antenna slot numbers and position on the performance of microwave ablation

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Medicine in Novel Technology and Devices 2023年第4期20卷 105-113页

作者： Sabiha Binte aziz md Rejvi Kaysir md Jahirul Islam Torikul Islam Mahmudur Rahman Department of Biomedical Engineering(BME) Khulna University of Engineering&TechnologyKhulna-9230Bangladesh Photonics Research Group Department of EEEKhulna University of Engineering&TechnologyKhulna-9230Bangladesh Department of Electrical and Computer Engineering Waterloo Institute for NanotechnologyUniversity of Waterloo200 University AveWaterlooONCanada Department of Biomedical Engineering(BME) New Jersey Institute of TechnologyNewarkNJUSA Department of Electrical and Electronic Engineering Dhaka University of Engineering&TechnologyGazipur 1707Bangladesh

Microwave ablation(MWA)is a type of thermal ablation used for cancer treatment in interventional *** induce localized tissue heating MWA employs electromagnetic waves within the microwave energy spectrum,which is done by the precisely designed *** study substantially emphasizes the design and performance ameliorating of slot(both single and double)antennae and compares the results with conventional monopole antennae in terms of temperature distribution,specific absorption ratio(SAR),and thermal tissue damage *** simulation has been done in COMSOL by solving the Bioheat equation along with Maxwell electromagnetic equations using the finite element *** simulation results reveal that the double-slot antenna has the most accurate and directional heat dissipation for liver tumors as well as the highest tissue damage rate and *** highest SAR was found to be 3500 W/kg and 3350 W/kg at the implant depth of 61 mm and 63 mm for double and single-slot antennae,*** addition,the fastest tissue damage occurred near the upper slot of the double-slot *** study helps to understand the basic design parameters for enhancing single and doubleslot antennae performance.

关键词： Microwave ablation(MWA) Finite element method(FEM) Liver tumor Microwave antenna Specific absorption rate(SAR)

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Comparative studies of elemental composition in leaves and flowers of Catharanthus roseus growing in Bangladesh

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Asian Pacific Journal of Tropical Biomedicine 2016年第1期6卷 50-54页

作者： Shahin aziz Koushik Saha Nasim Sultana Husna Parvin Nur md.Aminul Ahsan Shamim Ahmed md.Kamal Hossain Chemical Research Division BCSIR Department of Chemistry Jahangirnagar University Bangladesh Council of Scientific and Industrial Research (BCSIR) Laboratories

Objective:To investigate the elemental composition of the leaves and flowers of Catharanthus roseus(***) due to the plant's wide application in the indigenous medicinal system and its chemical constituents' ***:The atomic absorption spectrophotometer was used for quantitative analysis of various ***:Total 13 important elements were analyzed in leaves and flowers of *** indicated the presence of Na,K,Ca,Mg,Cr,Fe,Zn,Al,Cu,Ni,Pb,Cd and Mn in both leaves and *** most important finding of the work was that,leaves of *** showed high concentration of all elements except K and Zn while flowers of *** showed higher concentration of K and ***:The elemental composition in both leaves and flowers of *** were found to be ***,different parts of this medicinal plant are enriched in some micro and macro nutrients like Fe,Ca,Na,K,Zn,which are very important for biological metabolic system as well as human health.

关键词： Bangladesh Catharanthus roseus Indigenous medicinal systems Atomic absorption spectrophotometer Elemental composition

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An in vivo study of the pharmacological activities of a methanolic acetate fraction of Pistia stratiotes L.: An ethno-medicinal plant used in Bangladesh

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Animal Models and Experimental Medicine 2018年第3期1卷 221-227页

作者： md.Saddam Hussain md.Ibrahim md.Murad Hasan Mohammad Tarek aziz Suzia Akter Suchi md.Giash Uddin Department of Pharmacy Noakhali Science and Technology University Department of Pharmacy Atish Dipankar University of Science and Technology Department of microbiology Noakhali Science and Technology University

Background: The present study covered an assessment of methanolic acetate fractions of Pistia stratiotes, commonly known as water lettuce, for analgesic, anti-inflammatory, and CNS depressant ***: The methanol acetate fractions were extracted from Pistia stratiotes and administered to the experimental animals as 200 and 400 mg/kg doses to determine the effect on acetic acid-induced writhing and formalin-induced licking and biting,for the assessment of analgesic activity. The anti-inflammatory assay was done using the carrageenan-induced hind paw edema method, while assessment of CNS depressant activity was done using the open field and hole cross tests. The effects were compared to standard reference ***: At both doses(200 and 400 mg/kg body weight), the methanolic acetate extract of P. stratiotes showed significant analgesic action(P < 0.05) against acetic acid-induced writhing. The extract was also found to give significant protection against licking and biting at both doses. The methanolic acetate extract of P. stratiotes showed a significant(P < 0.05) anti-inflammatory effect from 0 minutes up to 3 hours in the carrageenan-induced paw edema test. In the CNS depressant assay,the methanolic acetate extract showed significant(P < 0.05) depressant activity at both doses from 30 to 120 minutes in both the hole cross and open field ***: Thus we can conclude that P. stratiotes extracts have significant analgesic, anti-inflammatory, and CNS depressant activity, compared to standard compounds, in an animal model.

关键词： acetic acid analgesic anti-inflammatory CNS-depressant formalin P.stratiotes

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An assessment study of absorption effect:LED vs tungsten halogen lamp for noninvasive glucose detection

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Journal of Innovative Optical Health Sciences 2015年第2期8卷 61-65页

作者： Nur Ain Mohd aziz Norhana Arsad P.Susthitha Menon Sahbudin Shaari Zalhan md Yusof Abdur Rehman Laili Institute of Microengineering and Nanoelectronics(IMEN) Dept.of ElectricalElectronic and System Engineering Faculty of Engineering and Built Environment The National University of MalaysiaBangiSelangor Department of Photonics MIMOS Berhad57000 Technology Park MalaysiaKuala LumpurMalaysia

Noninvasive gluoose monitoring development is critical for diabetic patient continuous ***,almost all the available devices are invasive and *** methods such as using spectroscopy have shown some good ***,the drawback was that the tungsten halogen lamps 1usage that is impractical if applied on human *** paper compared the light emitting diode(LED)to traditional tungsten halogen lamps as light source for glucose detection where the type of light source plays an important role in achieving a good spectrum *** concentration measurement has been developed as part of noninvasive technique using optical *** change and overlapping in tungsten halogen results need to replace it with a more convenient light source such as *** on the result obtained,the performance of LED for absorbance spectrum gives a signifcantly different and is directly proportional to the glucose *** result shows a linear trend and scucssully detects lowest at 60 to 160 mg/dL glucose concentration.

关键词： Tungsten halogen LED glucose rflectance absorbance spectrometer

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