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    Wyświetlanie 1-41 z 41
    Tytuł:
    Enhancing Responsivity of Porous GaN Metal-Semiconductor-Metal Ultraviolet Photodiodes by Using Photoelectrochemical Etching
    Autorzy:
    Al-Heuseen, K.
    Hashim, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490759.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Rb
    42.79.Pw
    Opis:
    In this paper porous and as-grown GaN metal-semiconductor-metal photodiodes with Ni contact electrodes were fabricated. Structural and optical properties were studied of the both samples. Both detectors show a sharp cut-off wavelength at 370 nm, with a maximum responsivity of 0.14 A/W and 0.065 A/W achieved at 360 nm for porous GaN and as-grown metal-semiconductor-metal photodetectors, respectively. The metal-semiconductor-metal photodiode based on porous GaN shows enhanced twice magnitude of responsivity relative to the as-grown GaN metal-semiconductor-metal photodiode. Enhancement of responsivity can be attributed to the relaxation of stress and reduction of surface pit density in the porous sample. The porous sample showed a significantly low dark current at 5 V as compared to as grown sample.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 71-73
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pupils’ Opinions on Digital Systems Education Enriched by DCBLP Discourse
    Autorzy:
    Hapl, Lukáš
    Kostolányová, Kateřina
    Habiballa, Hashim
    Powiązania:
    https://bibliotekanauki.pl/articles/1964300.pdf
    Data publikacji:
    2021-09-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    DCBLP
    digital systems
    e-learning
    Packet Tracer
    students’ opinions
    Opis:
    The article presents knowledge about the modified e-learning on-line synchronous teaching of digital systems, which took place in the period of widespread closure of schools during almost the entire school year 2020/2021 at a secondary school with an IT focus. The importance of teaching digital systems in computer science and the integration of teaching into available lessons is briefly clarified. Furthermore, the content of teaching is presented, including its modification by elements of programming by DCBLP discourse and links to existing knowledge about this use from previous years. The subject of research interest will be the specific effects of changes on students’ opinions regarding the content of the subject. For this purpose, a qualitative investigation based on the design of the grounded theory will be used. The work brings partial knowledge that can serve as additional material for the determination of other research questions, hypotheses and identification of potential problems in teaching. The results show the pupils’ interest in the digital systems enriched by the programming discourse reveals the possible perception of a long time distance learning in this area.
    Źródło:
    The New Educational Review; 2021, 65; 200-210
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient FPGA Implementation of Recursive Least Square Adaptive Filter Using Non-Restoring Division Algorithm
    Autorzy:
    Thannoon, Harith H.
    Hashim, Ivan A.
    Powiązania:
    https://bibliotekanauki.pl/articles/27311979.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Adaptive filter
    RLS
    AP
    CORDIC
    non-restoring
    Opis:
    In this paper, Recursive Least Square (RLS) and Affine Projection (AP) adaptive filters are designed using Xilinx System Generator and implemented on the Spartan6 xc6slx16- 2csg324 FPGA platform. FPGA platform utilizes the non-restoring division algorithm and the COordinate Rotation DIgital Computer (CORDIC) division algorithm to perform the division task of the RLS and AP adaptive filters. The Non-restoring division algorithm demonstrates efficient performance in terms of convergence speed and signal-to-noise ratio. In contrast, the CORDIC division algorithm requires 31 cycles for division initialization, whereas the non-restoring algorithm initializes division in just one cycle. To validate the effectiveness of the proposed filters, a set of ten ECG records from the BIT-MIT database is used to test their ability to remove Power Line Interference (PLI) noise from the ECG signal. The proposed adaptive filters are compared with various adaptive algorithms in terms of Signal-to-Noise Ratio (SNR), convergence speed, residual noise, steady-state Mean Square Error (MSE), and complexity.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 4; 811--817
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a Predictive PID Controller Using Particle Swarm Optimization
    Autorzy:
    Mustafa, Norhaida
    Hashim, Fazida Hanim
    Powiązania:
    https://bibliotekanauki.pl/articles/1844451.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    proportional integral derivative controller
    particle swarm optimization (PSO) algorithm
    optimization
    predictive PID
    Opis:
    The proportional-integral-derivative (PID) controller is widely used in various industrial applications such as process control, motor drives, magnetic and optical memory, automotive, flight control and instrumentation. PID tuning refers to the generation of PID parameters (Kp, Ki, Kd) to obtain the optimum fitness value for any system. The determination of the PID parameters is essential for any system that relies on it to function in a stable mode. This paper proposes a method in designing a predictive PID controller system using particle swarm optimization (PSO) algorithm for direct current (DC) motor application. Extensive numerical simulations have been done using the Mathwork’s Matlab simulation environment. In order to gain full benefits from the PSO algorithm, the PSO parameters such as inertia weight, iteration number, acceleration constant and particle number need to be carefully adjusted and determined. Therefore, the first investigation of this study is to present a comparative analysis between two important PSO parameters; inertia weight and number of iteration, to assist the predictive PID controller design. Simulation results show that inertia weight of 0.9 and iteration number 100 provide a good fitness achievement with low overshoot and fast rise and settling time. Next, a comparison between the performance of the DC motor with PID-PSO, with PID of gain 1, and without PID were also discussed. From the analysis, it can be concluded that by tuning the PID parameters using PSO method, the best gain in performance may be found. Finally, when comparing between the PID-PSO and its counterpart, the PI-PSO, the PID-PSO controller gives better performance in terms of robustness, low overshoot (0.005%), low minimum rise time (0.2806 seconds) and low settling time (0.4326 seconds).
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 4; 737-743
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Approach of an Error Detecting and Correcting Circuit by Arithmetic Logic Blocks
    Autorzy:
    Kavitha, S.
    Hashim, Fazida Hanim
    Kamal, Noorfazila
    Powiązania:
    https://bibliotekanauki.pl/articles/226549.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EDAC
    ALU
    speed
    block reduction
    power
    slew rate
    Opis:
    This paper proposes a unique method of an error detection and correction (EDAC) circuit, carried out using arithmetic logic blocks. The modified logic blocks circuit and its auxiliary components are designed with Boolean and block reduction technique, which reduced one logic gate per block. The reduced logic circuits were simulated and designed using MATLAB Simulink, DSCH 2 CAD, and Microwind CAD tools. The modified, 2:1 multiplexer, demultiplexer, comparator, 1-bit adder, ALU, and error correction and detection circuit were simulated using MATLAB and Microwind. The EDAC circuit operates at a speed of 454.676 MHz and a slew rate of -2.00 which indicates excellence in high speed and low-area.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 2; 313-318
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of Municipal Solid Waste Landfill for Baghdad City
    Autorzy:
    Takrid, Munaem Nafae
    Haydar, Ahmed Al-Najar
    Nabeel, Hashim Ameen Al-Tameemi
    Huda, Nassar Karkoush
    Powiązania:
    https://bibliotekanauki.pl/articles/1178769.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Municipal solid waste generation rate
    landfill
    Opis:
    Accumulation of municipal solid waste in residential areas is one of the public health problems in Iraq. In the other hand, accurate and reliable information on solid waste generation rate are very important elements to plan and implement solid waste management system. The volume and surface area required for a landfill to dispose the municipal solid wastes generated in Baghdad city is evaluated in this study. The per capita solid wastes generation rates are measured for a family consists of 10 individuals by using portable balance (Salter, 0 to 130 kg). Probability sampling is used to determine the minimum number of measurements needed to evaluate the mean of per capita solid wastes generation rate with a certain level of precision (a specified error level of 5% is selected corresponds to 95% confidence that the mean value is in accurate estimate of the true value). The results indicate that an area of approximately 1603 m on a side is required for the next 20 years as a sanitary landfill for disposing the municipal solid wastes generated in Baghdad city.
    Źródło:
    World Scientific News; 2017, 90; 1-10
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heart-rate Monitoring System Design and Analysis Using a Nios II Soft-core Processor
    Autorzy:
    Lim, C. K.
    Jambek, A.B.
    Hashim, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/226033.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pulse sensor
    PPG
    heart rate
    FPGA
    Nios II
    Opis:
    The heart rate of a person is able to tell whether they are healthy. A heart-rate monitoring device is able to measure or record the heart rate of a person in real time, whether it is an electrocardiogram (ECG) or a photoplethysmogram (PPG). In this work, a microprocessor system loaded with a heart-rate monitoring algorithm is implemented. The microprocessor system is the Nios II processor system, which interfaces with an analogue-to-digital converter (ADC) and a pulse sensor. A beat-finding algorithm is used in the microprocessor system for heart rate measurement. An experiment is carried out to analyse the functionality of the microprocessor system loaded with the algorithm. The results show that the detected heart rate is in the range of the average human being’s heart rate. The signal flow within the microprocessor system is observed and analysed using SignalTap II from Quartus’ software. Based on a power analysis report, the proposed microprocessor system has a total power dissipation of around 218.26 mW.
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 3; 283-288
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multicultural Pedagogy: Strengthening Social Interaction Among Multi-Ethnic Pre-School Children
    Autorzy:
    Mamat, Nordin
    Hashim, Abdul Talib
    Razalli, Abdul Rahim
    Awang, Mohd Mahzan
    Powiązania:
    https://bibliotekanauki.pl/articles/2034171.pdf
    Data publikacji:
    2022-03-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    multi-ethnic
    pre-school
    multicultural
    pedagogy
    social interaction
    Opis:
    This study explored multicultural pedagogy in pre-school education and how it plays an important role in strengthening the social interactions among children. The Multicultural Pedagogy approach in teaching children has established the multi-ethnic (PERPADUAN/Unity) pre-school. It is a qualitative study with data drawn from observation and interview sessions aimed to identify strategies in nurturing social interaction among multi-ethnic children. Through purposive sampling, a teacher with twenty-five children and parents from various ethnicities were selected. This study revealed that practising multicultural pedagogy reflects the diversity of ethnics strengthening social interaction. The teacher exposed the children to the cultures of every ethnic group to ensure they have understood other cultures from different ethnicity. When the children are exposed to the elements of different cultures, a sense of acceptance and tolerance attitude can be fostered. This strategy nurtured national integration, encouraging interactions among multi-ethnic children, stimulating acceptance and tolerance between children and creating a school environment that reflects the diversity of ethnicities. Core multicultural elements have been found in the PERPADUAN/Unity School. Overall findings from the current study provide new evidence illustrating how multicultural pedagogy implemented strengthens social interaction in early childhood education.
    Źródło:
    The New Educational Review; 2022, 67; 56-67
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study of Failure Analysis in Notched and Repaired Fiberglass Epoxy Composite
    Autorzy:
    Hassoon, Omar Hashim
    Enzi, Abass
    Kashkool, Lujain H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172353.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    damage analysis
    GFRP
    repaired GFRP
    finite element analysis
    FEA
    Opis:
    The composite materials are remarkably increasing in many industry sectors like aircraft, automobiles, oil pipes, and marine boats. This attention comes from their excellent properties, such as lightweight and high strength. However, these materials expose many damages like fiber-matrix debonding, matrix crack, and delamination. The composite structures risked damage through the service life and therefore need to repair to achieve their function with a good performance. This paper focuses on the analysis during the tensile test of samples of fiberglass epoxy composite materials exposed to damage before and after repair. Experimental and numerical investigations are performed to determine and identify mechanical properties and failure analysis between repaired and unrepaired composite plates. Five samples are selected: without hole, 4 mm hole-repaired, stepped hole from 4 to 8 mm, and stepped hole from 4 to 8 mm-repaired. Simulation models are created using the finite element (FE) method to compare them with Abaqus's practical experiments to predict damage during the tensile test. To simulate damage models, interlaminar and intralaminar damage, were used to study initiation and propagation of the samples failure. Results show that the experimental and numerical investigations of the repaired samples have a significant effect on the mechanical properties and failure behavior of the holed and stepped plates compared with unrepaired samples. Also, maximum stress and strain are concentrated around and on both sides of the hole, while the most significant damage occurs around the hole and the axial direction.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 2; 99--108
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Rainfall-Runoff Erosivity Factor for Cameron Highlands, Pahang, Malaysia
    Autorzy:
    Abdulkadir, T. S.
    Mustafa, M. R.
    Yusof, K. W.
    Hashim, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/123050.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    rainfall
    erosivity factor
    soil erosion
    USLE/RUSLE
    runoff
    Opis:
    Rainfall-runoff is the active agent of soil erosion which often resulted in land degradation and water quality deterioration. Its aggressiveness to induce erosion is usually termed as rainfall erosivity index or factor (R). R-factor is one of the factors to be parameterized in the evaluation of soil loss using the Universal Soil Loss Equation and its reversed versions (USLE/RUSLE). The computation of accurate R-factor for a particular watershed requires high temporal resolution rainfall (pluviograph) data with less than 30-minutes intensities for at least 20 yrs, which is available only in a few regions of the world. As a result, various simplified models have been proposed by researchers to evaluate R-factor using readily available daily, monthly or annual precipitation data. This study is thus aimed at estimating R-factor and to establish an approximate relationship between R-factor and rainfall for subsequent usage in the estimation of soil loss in Cameron highlands watershed. The results of the analysis showed that the least and peak (critical) R-factors occurred in the months of January and April with 660.82 and 2399.18 MJ mm ha-1 h-1year-1 respectively. Also, it was observed that erosivity power starts to increase from the month of January through April before started falling in the month of July. The monthly and annual peaks (critical periods) may be attributed to increased rainfall amount due to climate change which in turn resulted to increased aggressiveness of rains to cause erosion in the study area. The correlation coefficient of 0.985 showed that there was a strong relationship rainfall and R-factor.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 3; 1-8
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Uniform Germanium Islands on Silicon Substrate Using Nickel as Catalyst by Thermal Evaporation Method
    Autorzy:
    Jumidali, M.
    Hashim, M.
    Abdul Aziz, A.
    Abd Rahim, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193093.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ea
    81.10.Bk
    81.15.-z
    Opis:
    Uniform germanium islands (GIs) were grown on Si (100) using a nickel layer as catalyst through the physical vapor deposition of germanium (Ge) powder at 1000°C at different deposition times. Prior to the deposition of Ge layer, nickel (Ni) catalyst was deposited on silicon substrates via radio frequency magnetron sputtering technique. Scanning electron microscopy results showed that the increase in deposition time resulted in a variation in surface morphology. Energy dispersive X-ray spectrometer analysis found that the GI samples composed of Ni element indicating the role of Ni in uniform Ge islands formation. The X-ray diffraction pattern spectra revealed that the GIs exhibited a Ge cubic structure and the intensity of Ge peaks varies with deposition time. In-plane strain indicated that the strain caused by the substrate is tensile and changed to compressive strain at the longer deposition time. The Raman spectra exhibited a red shift in the Ge-Ge peak, compared with the bulk Ge, as a result of compressive strain of the GIs. Fourier transform infrared spectrum analysis also indicated that the optical band gap Eg values of GIs can be varied by deposition time.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1068-1071
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risk factors of musculoskeletal disorders among oil palm fruit harvesters during early harvesting stage
    Autorzy:
    Ng, Y.G.
    Tamrin, S.B.M.
    Yusoff, I.S.M.
    Hashim, Z.
    MD Deros, B.
    Bakar, S.A.
    How, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/49639.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2015, 22, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Composition on Melt Flow and Density of Polypropylene Copolymer/Kaolin Geo-Filler Composites
    Autorzy:
    Zulkifli, Zulaikha
    Daud, Yusrina Mat
    Zainal, Farah Farhana
    Hashim, Mohammad Firdaus Abu
    Aygörmez, Yurdakul
    Powiązania:
    https://bibliotekanauki.pl/articles/2203755.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geo-filler
    kaolin
    composites
    polypropylene
    rheological
    Opis:
    This study examined the effects rheological properties of different composition kaolin and kaolin geo-filler in polypropylene composites. Polypropylene composites with varying composition of kaolin geo-filler 0 wt%, 2 wt%, 4 wt%, 6 wt%, 8 wt%, and 10 wt% was prepared and compared with polypropylene composite with raw kaolin. Kaolin is an aluminosilicate based mineral filler was used to prepare geopolymer paste by combining with alkaline activator solution. The polypropylene composite was compounded using a twin-screw extruder and the melt flow index was determined by a constant weight pressure of 2.16 kg at 230°C in 10 min. Knowing the melt flow index is necessary to predict and control the process, the study has demonstrated that the composition of kaolin filler and kaolin geo-filler affects the melt flow, melt density and surface morphology at varies composition. Composites with kaolin geo-filler have demonstrated high melt flow index process and having better distribution and flow.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 369--373
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lung Cancer Risk Due to Radon in Different Brand Cigarette Tobacco in Iraqi Market
    Autorzy:
    Abdalsattar, Kareem Hashim
    Ahmed Najam, Ahmed Najam
    Abbas, Fadhel Hadi
    Fadhil, Khaddam fuliful
    Powiązania:
    https://bibliotekanauki.pl/articles/1178355.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CR-39
    Radon
    effective dose
    lung cancer
    nuclear track detectors
    tobacco
    Opis:
    Sealed can technique using CR-39 plastic track detector strippable has been used in order to measure radon concentrations to calculate the annual effective dose and lung cancer cases per year per million person for twenty different brand tobacco cigarette were collected from Iraqi market. Lung cancer is the leading cause of cancer-related deaths worldwide. Radon exposure is the second leading cause of lung cancer, following tobacco smoke. Radon is not only an independent risk factor; it also increases the risk of lung cancer in smokers. It has been observed that tobacco smoking increases the risks of radon-induced lung cancer. Radon and cigarette smoking have synergistic, multiplicative effect on lung cancer rates. People who inhale tobacco smoke are exposed to higher concentrations of radioactivity. Ever since studies on the relation of smoking to cancer, particularly the lung cancer has been established, there had been a great interest in studies concerned with the monitoring of the alpha radioactivity in tobacco. The results showed that the 222Rn concentrations in cigarette tobacco samples ranged from (156.450 to 403.087) Bq/m3 with an average 284.751 Bq/m3, while the radon induced lung cancer risks was found to vary from 71.047 to 183.049 with an av¬erage value of 129.3107 per million person, and standard deviation 83.529 and 37.932, respectively. Excellent correlation has been observed between radon concentration and lung cancer cases per year per million person for different brand tobacco cigarettes.
    Źródło:
    World Scientific News; 2017, 77, 2; 163-176
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of rainfall region boundaries for the western region found by Dale (1959) in Peninsular Malaysia
    Autorzy:
    Hashim, Mohmadisa
    Nayan, Nasir
    Said, Zahid Mat
    Setyowati, Dewi Liesnoor
    Saleh, Yazid
    Mahat, Hanifah
    Koh, See L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073752.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    GIS
    isohyetal method
    Peninsular Malaysia
    rainfall region boundary
    Opis:
    Re-delimitation of rainfall regions plays an important role in determining the rainfall pattern of an area. This study aims to reconstruct the delimitation of rainfall regions for the western region of Peninsular Malaysia. This study involved only the collection of rainfall data at 133 stations from 1960 to 2010. These data were obtained from the Department of Irrigation and Drainage, Malaysia. The analysis methods applied include kriging, contouring and topology using a geographical information system. The results showed that the new delimitation of the western region has been formed with an area reduction of 10% compared to the original western region found by Dale. This is due to some areas in the western region have not received rainfall between 2540 and 2794 mm. The area that getting the rainfall between 2540 and 2794 mm is 46,413.6 km2, in contrast to the sized of Dale’s western region of 51,596.2 km2. The area that frequently getting rainfall of between 2540 and 2794 during 1960s to 2010 are Parit Buntar, Taiping, Kuala Kangsar, Ipoh, Teluk Intan, Tanjong Malim, Batang Kali, Cameron Highlands, Subang, Petaling Jaya, Klang, Kajang and Bangi. The new delimitation formed through this study can be used as a guide by the agencies that manage water resources in Perak, Selangor and Negeri Sembilan in planning a more efficient water supply system.
    Źródło:
    Journal of Water and Land Development; 2022, 52; 205--209
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Optical Characterizations of~Ge Nanostructures Fabricated by~RF Magnetron Sputtering and Rapid Thermal Processing
    Autorzy:
    Abd Rahim, A.
    Hashim, M.
    Rusop, M.
    Jumidali, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490688.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.ag
    68.60.Dv
    61.46.Hk
    78.67.Bf
    61.05.C-
    Opis:
    In this work, we use a simple and cost effective technique of sputtering followed by the rapid thermal processing at 900C for 30 s to form Ge nanostructures on the Si(100) substrate. A layer of Ge (300 nm) and Si cap layer (100 nm) were deposited using RF magnetron sputtering. Two samples were prepared: Ge layer with Si capping (Si/Ge/Si) and Ge layer without Si capping (Ge/Si). Scanning electron microscopy shows that subsequent annealing in a rapid thermal processing gives uniformed Ge or SiGe islands with an estimated size of 100-500 nm. For the Ge/Si sample, under post growth annealing there had vanished the deposited Ge layer as confirmed by energy dispersive X-ray analysis. Atomic force microscopy shows that the surface roughness increases by a factor of 15.55% as the islands formed. The Raman spectrum shows that good crystalline structures of the Ge and SiGe peaks are produced. High resolution X-ray diffraction reveals cubic and tetragonal Ge phases with estimated average crystallite sizes of 42 nm and 20 nm, respectively. The results showed that it is possible to grow high quality Ge and SiGe nanostructures using a simple technique of sputtering for potential applications in photonics and high speed devices.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 16-19
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of welding parameters of resistance spot welding on joining aluminum with copper
    Autorzy:
    Sar, Mohammed Helan
    Ridha, Munaf Hashim
    Husain, Imad M.
    Barrak, Osamah Sabah
    Hussein, Sabah Khammass
    Powiązania:
    https://bibliotekanauki.pl/articles/2174202.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    zgrzewanie oporowe
    aluminium
    miedź
    resistance spot welding (RSW)
    aluminum (Al)
    copper
    RSW parameter
    DOE
    Opis:
    The resistance spot welding (RSW) method was used to join aluminum alloy AA 1050 and copper alloy UNS C50100 sheets. Mechanical properties of the joints were examined. The influence of welding process parameters on tensile shear force of the joints was discussed. The design of experiments (DOE) method was used to analyze the influence of welding parameters on the mechanical properties of the joints. Three RSW parameters were used: welding current, squeeze time, and welding time. The results showed that the joint shear stress increased with increasing the welding current until a value of 12000 Amp. Then the shear stress decreased. The tensile shear stress increased with increasing the welding and squeeze time. As a consequence, it can be possible to weld copper with aluminum by RSW.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 217--225
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serological cross-sectional survey of equine infectious anemia in Saudi Arabia
    Autorzy:
    Kasem, S.
    Hashim, O.
    Alkarar, A.
    Hodhod, A.
    Elias, A.
    Abdallah, M.
    Al-Sahaf, A.
    Al-Doweriej, A.
    Qasim, I.
    Abdel-Moneim, A.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539306.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    equine infectious anaemia
    equine
    ELISA
    Saudi Arabia
    seroprevalence
    Opis:
    The equine infectious anaemia virus (EIAV) is one of the most serious equine diseases worldwide. There is scarce information on the epizootiology of equine infectious anaemia (EIA) in Saudi Arabia. Given the importance of the equine industry in Saudi Arabia, this cross- -sectional study aims to provide information about the prevalence of EIAV based on serological surveillance of the equine population in the country. A total of 4728 sera samples were collected (4523 horses and 205 donkeys) between December 2017 and November 2019. All samples were tested using commercially available EIAV ELISA. All tested samples showed negative results for EIAV antibodies with a 95% confidence interval. The results provided evidence that Saudi Arabia’s equine populations (horses and donkeys) are currently free of EIAV. The results also suggest the need for continuous monitoring of EIAV and strict regulation when importing horses from other countries.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 3; 365-368
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiological Dose and Risk Assessment for Selected Residential Regions in Baghdad City, Iraq
    Autorzy:
    Sabri, Areej Adnan
    Al-Tameemi, Nabeel Hashim Ameen
    Abdulwahid, Safaa Talib
    Mohammad, Abbas Neamah
    Powiązania:
    https://bibliotekanauki.pl/articles/1071454.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    137Cs
    232Th
    238U
    40K
    Baghdad
    Natural radioactivity
    RESRAD code
    radiological hazards
    radionuclides
    Opis:
    Fifty-one surface soil samples were collected from two selected residential areas in Baghdad city (Al-Adhamiya and Al-Sha’ab areas) and analyzed using gamma-ray spectroscopy system. The activity concentrations of 238U, 232Th, 40K and 137Cs for soil samples collected from Al-Adhamiya area ranged from 9.19 to 22.7 Bq/kg, 5.91 to 17.8 Bq/kg, 236.36 to 507.56 Bq/kg and below minimum detectable activity to 3.07 Bq/kg, respectively. For soil samples collected from Al-Sha’ab area, the activity concentrations of 238U, 232Th, 40K and 137Cs ranged from 9.21 to 24.51 Bq/kg, 6.41 to 16.81 Bq/kg, 246.32 to 402.78 Bq/kg and below minimum detectable activity to 4.8 Bq/kg, respectively. The RESRAD-Onsite code version 7.2 has been used to evaluate radiation dose and risk for the occupants of the areas of the study. The maximum total dose rates of 0.204 and 0.245 mSv/y were estimated for Al-Adhamiya and Al-Sha’ab areas, respectively. The total peak dose rates are about 5 times lower than the public radiation dose limit of 1 mSv/y. Based on the findings of the current study, it can be concluded that occupants in the investigated areas would not get any unacceptable radiological hazards due to radionuclides in soil.
    Źródło:
    World Scientific News; 2019, 122; 71-82
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Morphology on Magnetic Properties of Magnetosomes
    Autorzy:
    Hashim, A.
    Molčan, M.
    Kovač, J.
    Varchulová, Z.
    Gojzewski, H.
    Makowski, M.
    Kopčansky, P.
    Tomori, Z.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428653.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    51.60.+a
    75.30.Gw
    75.50.Tt
    75.60.Nt
    75.60.Ej
    Opis:
    Cultivation process was changed three times. The culture medium was enriched by more amount ferric quinate (FQ magnetosomes sample) and more amounts Wolfe's vitamin solution (WVS magnetosomes sample) comparing to normal culture medium (NP magnetosomes sample). NP sample of magnetosomes shows zero coercivity and behaves superparamagnetically. The increase of coercivity (6.5 Oe for WVS and 20 Oe for FQ) may be caused by higher value of shape anisotropy and reveals stronger magnetic correlations between particles of magnetite chains.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1250-1252
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Magnetosomes After Exposure to the Effect of the Sonication and Ultracentrifugation
    Autorzy:
    Molčan, M.
    Hashim, A.
    Kováč, J.
    Rajňák, M.
    Kopčanský, P.
    Makowski, M.
    Gojzewski, H.
    Molokáč, M.
    Hvizdák, L.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368025.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    75.60.-d
    87.50.Y-
    68.37.-d
    Opis:
    Magnetosomes are intracellular organelles of widespread aquatic microorganisms called Magnetotactic bacteria. At present they are under investigation especially in biomedical applications. This ability depends on the presence of intracellular magnetosomes which are composed of two parts: first, nanometer-sized magnetite $(Fe_{3}O_{4})$ or greigite $(Fe_{3}S_{4})$ crystals (magnetosome crystal), depending on the bacterial species; and second, the bilayer membrane surrounding the crystal (magnetosome membrane). The magnetosomes were prepared by biomineralization process of magnetotactic bacteria Magnetospirillum Magnetotacticum sp. AMB-1. The isolated magnetosome chains (sample M) were centrifugated at speed of 100000 rpm for 4 hours (sample UM) and sonicated at power of 120 W for 3 hours (sample SM), respectively. The prepared suspensions were investigated with respect to morphological, structural and magnetic properties. The results from scanning electron microscopy showed that isolated chains of magnetosomes were partially broken to smaller ones after ultracentrifugation. On the other hand the application of the sonication process caused the formation of individual magnetosomes (unordered in chain). These results were confirmed by coercivity and magnetization saturation measurements.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 198-199
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Land-use Assessment and its Influence on Spatial Distribution of Rainfall Erosivity: Case Study of Cameron Highlands Malaysia
    Autorzy:
    Ul Mustafa, Muhammad Raza
    Sholagberu, Abdulkadir Taofeeq
    Syazwan, Muhammad Asyraf
    Yusof, Khamaruzaman Wan
    Hashim, Ahmad Mustafa
    Abdurrasheed, Abdurrasheed S.
    Powiązania:
    https://bibliotekanauki.pl/articles/124485.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    land-use
    land cover
    erosivity
    Cameron Highlands
    GIS
    Opis:
    Over the years, Cameron Highlands have witnessed extensive land-use and land-cover (LULC) changes due to the massive agricultural and urbanization activities. This significantly contributed to the erosion problems in the area. Rainfall erosivity that measures the aggressiveness of raindrop in triggering soil erosion is one of its major components that could be influenced by the LULC changes in watersheds. However, the research relating to the LULC changes with the erosivity especially in the complex landscape is scarce. Hence, this study applies geographic information system (GIS) and remote sensing techniques to assess the LULC changes and their influence on the rainfall erosivity distribution in mountainous watershed of Cameron Highlands. Four Landsat images and the rainfall data from the period of thirty years were analysed for the development of LULC and erosivity maps respectively in ArcGIS environment. The study showed that the study area experienced immense land-use changes especially in agriculture and urbanization which affected the erosivity distribution. The LULC change for agriculture increased linearly in the last 30 years from 7.9% in 1986 to almost 16.4% in 2016. The results showed that urban development increased from 5.1% in 1986 to 11.4% in 2016. The increasing urbanization trend was targeted to meet up with tourism requirement in Cameron Highlands. However, forest class declined tremendously due to the exploration of land for agriculture practice and other various types of development. Watershed managers and other stakeholders should find this study beneficial in tackling erosion and its associated ecological challenges.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 2; 183-190
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Intra-Row Spacing of Pearl Millet (Pennisetum glaucum (L.) R.Br.) and Cropping Systems on Growth and Yields of Soybean-Pearl Millet Intercrop, in the Southern Guinea Savanna, Nigeria
    Autorzy:
    Ijoyah, Michael Ojore
    Hashim, Ishaya Kunzan
    Idoko, Joseph Adakole
    Powiązania:
    https://bibliotekanauki.pl/articles/1190199.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    spacing
    intercropping
    pearl millet
    soybean
    Nigeria
    Opis:
    Field experiments were separately conducted from June to November, in year 2012 at the Research Farm, University of Agriculture, Makurdi, Nigeria and at a Farm in Ibi, Nigeria, to evaluate the effects of intra-row spacing of pearl millet and cropping systems on growth and yields of soybean-pearl millet intercrop, as well as assessing the yield advantages of the intercropping system. The experiment was a 2 x 4 factorial combination of treatments, fitted in a randomized complete block design (RCBD), with four replications. The cropping systems constitute the soles and the intercrop, while the intra-row spacing of pearl millet into soybean were at 15 cm, 20 cm, 25 cm and 30 cm. Results of study showed that sowing pearl millet into soybean at the intra-row spacing of 30 cm produced the highest pearl millet yields of 4.7 t ha-1 and 4.9 t ha-1 respectively, at Makurdi and Ibi locations, as well as producing the highest soybean yields at both locations. In Makurdi, intercropping pearl millet with soybean significantly (P ≤ 0.05) decreased yield of pearl millet by 32.4 % and that of soybean by 29.4 % compared to sole cropping of the component crops, while at Ibi, intercrop yields of pearl millet and soybean were respectively reduced by 35.9 % and 30.0 % compared to their sole yields. Sowing pearl millet into soybean at the intra-row spacing of 30 cm also gave the highest total intercrop yields, highest land equivalent coefficient (LEC) values, highest land equivalent ratio (LER) values of 2.97 and 2.71 and highest percentage (%) land saved (66.3 % and 63.1 % respectively, recorded at Makurdi and Ibi locations). The implication of study showed that it is most advantageous having both crops in intercrop when pearl millet was sown into soybean at the intra-row spacing of 30 cm. This should therefore, be recommended for the southern guinea savanna, Nigeria.
    Źródło:
    World Scientific News; 2016, 44; 78-99
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of Radon-222 Concentrations in Selected Soil Samples in Al-Mothafeen Area (Kerbala, Iraq) by Using the CN-85 Detector
    Autorzy:
    Ibrahim, Abrrar Abbas
    Hashim, Abdalsattar Kareem
    Abojassim, Ali Abid
    Powiązania:
    https://bibliotekanauki.pl/articles/2088173.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    alpha emitters
    222Rn
    226Ra
    238U
    annual effective dose
    soil
    CN-85
    Kerbala University
    Opis:
    In this work, alpha emitters in the twenty soil samples in Al-Mothafeen sites were measured using the CN-85 detectors. The results show that the average values of radon concentration in the air space of the tube and in the sample were 163.15±3.37 Bq/m3 and 5090.54±155.3 Bq/m3, respectively, while the results of annual effective dose were varied from 10.2±0.3 mSv/y to 2.1±0.1 mSv/y with a mean value of 4.1±0.2 mSv/y, radium content were varied from 0.3±0.06 Bq/kg-1 to 0.06±0.02 Bq/kg with a mean value of 0.12±0.03 Bq/kg, and uranium contractions were varied from 9.29±0.33 Bq/kg to 1.90±0.15 Bq/kg with an average of 3.72±0.21 Bq/kg. Also, the average values of mass and surface exhalation rates were 0.95±8.64 mBq/kg.h and 44.59±0.79 mBq/m2.h, respectively. The results were within the normal limits of radiation, according to the International Commission on Radiological Protection (ICRP).
    Źródło:
    Polish Journal of Soil Science; 2021, 54, 2; 139-153
    0079-2985
    Pojawia się w:
    Polish Journal of Soil Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Site Preference Analysis and Ordering Characteristics of Ternary Cu0.5(Zn1–xMx)0.5 (M = Transition Metals) Alloys
    Autorzy:
    Ahmad, N.
    Ziya, A. B.
    Atiq, S.
    Saifullah, K.
    Hashim, M.
    Saleem, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352693.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ternary alloy systems
    order-disorder transformations
    site occupancy
    ab-initio calculations
    ordering energies
    Opis:
    The site preference of some transition metals during B2-type ordering has been investigated in the ternary Cu0.5 (Zn1-x Mx )0.5 alloys with M = Ti, V, Ag, Au, Cr, Mn, Fe, Co, Ni, Nb, Mo, Hf, Ta, W, Re or Pt (x ≤ 0.01). The statistic-o-thermodynamical theory combined with the electronic theory of alloys has been used to calculate the partial ordering energies, partial short range order parameters and the order-disorder transformation temperatures. The values of partial short range order parameters have been used to determine the site preference of the metal M. The analysis shows that the metals M can be divided into two groups with regard to lattice site occupancy. One group comprising of Cr, Mn, Fe, Co, Ni, Nb, Mo, Hf, Ta, W, Re or Pt was found to prefer Zn sublattice sites, while the second group of Ti, V, Ag or Au atoms prefer Cu sublattice sites. It is found that order-disorder transformation temperature and the site preference of metal M both depend strongly on the partial ordering energies and ternary alloying addition of metal M.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1531-1535
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review on Mechanical Properties of Metakaolin Geopolymer Concrete by Inclusion of Steel Fibers
    Autorzy:
    Faris, Meor Ahmad
    Mohd Mustafa Al Bakri, Abdullayh
    Muniandy, Ratnasamy
    Ramasamy, Shamala
    Abu Hashim, Mohammad Firdaus
    Junaedi, Subaer
    Sandu, Andrei Victor
    Mohd Tahir, Muhammad Faheem
    Powiązania:
    https://bibliotekanauki.pl/articles/2048744.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer
    metakaolin
    fiber reinforced concrete
    steel fiber
    mechanical properties
    Opis:
    This study summarised the recent achievement in developing fiber reinforced geopolymer concrete. The factor of replacing Ordinary Portland Cement (OPC) which is due to the emission of carbon dioxide that pollutes the environment globally is well discussed. The introduction towards metakaolin is presented. Besides, the current research trend involved in geopolymer also has been reviewed for the current 20 years to study the interest of researchers over the world by year. Factors that contribute to the frequency of geopolymer research are carried out which are cost, design, and the practicality of the application for geopolymer concrete. Besides, the importance of steel fibers addition to the geopolymer concrete is also well discussed. The fundamental towards metakaolin has been introduced including the source of raw material, which is calcined kaolin, calcined temperature, chemical composition, geopolymerisation process, and other properties. Alkali activators which are mixing solution between sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) have been reviewed. The mechanical properties of fibers reinforced metakaolin-based geopolymer concrete which is compressive and flexural are thoroughly reviewed. The compressive and flexural strength of fiber-reinforced metakaolin geopolymer concrete shows some improvement to the addition of steel fibers. The reviews in this field demonstrate that reinforcement of metakaolin geopolymer concrete by steel fibers shows improvement in mechanical performance.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 261-267
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment on the Physical, Mechanical Properties and Leaching Behaviour of Fired Clay Brick Incorporated with Steel Mill Sludge
    Autorzy:
    Sarani, Noor Amira
    Hashim, Azini Amiza
    Kadir, Aeslina Abdul
    Hissham, Nur Fatin Nabila
    Hassan, Mohd Ikhmal Haqeem
    Nabiałek, Marcin
    Jeż, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/2048828.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    building materials
    leachability
    fired clay brick
    steel mill sludge
    brick properties
    Opis:
    The disposal of industrial steel mill sludge in landfills has frequently received significant concern as the sludge has a very notable potential to contaminate soil surface and groundwater in the long run. Recently, the incorporation of industrial steel mill sludge into fired clay brick has become one of the promising alternative methods as it could produce a lightweight product while minimizing the environmental impact of the waste used. In this study, fired clay bricks as the most common building material were incorporated with 0%, 5%, 10% and 15% of steel mill sludge and fired at 1050°C (heating rate of 1°C/min). The manufactured bricks were subjected to physical and mechanical properties such as firing shrinkage, dry density, and compressive strength while the Toxicity Characteristic Leaching Procedure (TCLP) was conducted to analyze leaching behavior from the manufactured bricks. The results demonstrated that incorporation up to 15% of steel mill sludge reduces the properties up to 27.3% of firing shrinkage, 8.1% of dry density and 67.3% of compressive strength. The leaching behavior of Zn and Cu from steel mill sludge was reduced up to 100% from 7414 to 9.22 ppm (Zn) and 16436 to 4.654 ppm (Cu) after 15% of sludge incorporation. It was observed that high temperature during the firing process would improve the properties of bricks while immobilizing the heavy metals from the waste. Therefore, recycling steel mill sludge into construction building materials could not only alleviate the disposal problems but also promote alternative new raw materials in building industries.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 209-214
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of vortex runner gating system on the mechanical strength of Al-12SI alloy castings
    Wpływ kanału układu wlewowego na wytrzymałość mechaniczną odlewów ze stopu Al-12Si
    Autorzy:
    Ahmad, R.
    Hashim, M. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/352629.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odlewy piaskowe
    wytrzymałość mechaniczna
    analiza Weibulla
    układ wlewowy
    gating systems
    sand casting
    mechanical strength
    Weibull analysis
    Opis:
    Gating system design is an essential element in casting process which affects significantly the molten metal flow behavior, heat transfer and solidification of the melt. Optimum gating design will lead to a good quality of casting product. One of the major components in gating system is runner. This study was conducted to determine the effect of vortex runner diameter gating system on the mechanical strength of Al-12Si alloy casting. Simulation was conducted to study the behavior of the fluid flow and the results obtained showed close agreement with the results obtained from the experiment. Experimental results showed that the casting product with bigger vortex runner diameter gating system led to the improvement of average bending strength.
    Układ wlewowy to podstawowy element w procesie odlewania, który znacząco wpływa na płynięcie ciekłego metalu, transport ciepła oraz krzepnięcie metalu. Optymalny układ wlewowy gwarantuje dobra jakość odlanego produktu. Jednym z głównych elementów układu wlewowego jest kanał wlewowy. Celem pracy było zbadanie wpływu średnicy kanału układu wlewowego na wytrzymałosc mechaniczna odlewów ze stopu Al-12Si. Celem zbadania zachowania przecieczy przeprowadzono symulacje i otrzymane wyniki wykazują dobrą zgodność z wynikami otrzymanymi doświadczalnie. Wyniki doswiadczeń pokazały, że zastosowanie większej srednicy kanału układu wlewowego prowadzi do poprawy średniej wytrzymałości odlewów na zginanie.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 991-991
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Joining of carbon steel AISI 1006 to aluminum alloy AA6061-T6 via friction spot joining technique
    Autorzy:
    Ridha, Munaf Hashim
    Saad, Mursal Luaibi
    Abdullah, Isam Tareq
    Barrak, Osamah Sabah
    Hussein, Sabah Khammass
    Hussein, Abbas Khammas
    Powiązania:
    https://bibliotekanauki.pl/articles/27312396.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    stal węglowa
    tarcie
    aluminium
    friction spot
    joining
    AA6061
    carbon steel AISI 1006
    DOE
    Opis:
    This work aims to join sheets of carbon steel to aluminum alloy AA6061. A lap joint arrangement was used with a joint lap area of dimensions *25 25 mm . The joining procedure was carried out using a rotating tool of 10 mm shoulder diameter. Three process parameters, with three levels for each parameter, were selected to investigate their effects on joints quality. The parameter’s levels for each experiment were designed using the design of the experiment method (DOE). The results indicated that the two materials were joined by a mechanical interlock at an interface line, without formation of intermetallic compounds. The shear force of the joint reached an ultimate value of .4 82kN . The shear force of the joint improved by increasing plunging depth of the tool. Samples of minimum shear force value failed by a pull-outing aluminum metal from the carbon steel specimen. Samples of higher shear force value exhibited a shear mode of fracture. Increasing the rotating speed and decreasing pre-heating increased the process temperature.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 4; 1--12
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Effects on Different Solid to Liquid Ratio of Geopolymer Filler in Epoxy Resin
    Autorzy:
    Hashim, Mohammad Firdaus Abu
    Ghazali, Che Mohd Ruzaidi
    Daud, Yusrina Mat
    Faris, Meor Ahmad
    Abdullah, Mohd Mustafa Al Bakri
    Zainal, Farah Farhana
    Hasyim, Saloma
    Lokman, Muhammad Taqiyuddin
    Powiązania:
    https://bibliotekanauki.pl/articles/2048832.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geopolymer filler
    fly ash
    tensile
    flexural
    morphology
    solid-liquid ratio
    Opis:
    Geopolymer is formed from the alkali activation of materials rich in Si and Al content with the addition of a silicate solution to enhance the properties of the materials. This paper presents research on the mechanical properties of fly ash-based geopolymer filler in epoxy resin by varying different solid to liquid ratios using sodium hydroxide and sodium silicate as the alkaline activator. However, the common problem observed from the solid to liquid ratio is the influence of curing time and compressive strength of geopolymer to have the best mechanical property. The mix design for geopolymers of solid to liquid ratio is essential in developing the geopolymer’s mechanical strength. A series of epoxy filled with fly ash-based geopolymer materials with different solid to liquid ratio, which is prepared from 0.5 to 2.5 solid to liquid ratio of alkaline activator. The tensile strength and flexural strength of the epoxy filled with fly ash-based geopolymer materials is determined using Universal Testing Machine under tensile and flexural mode. It was found that the optimum solid to liquid ratio is 2.0, with the optimum tensile and flexural strength value. However, both the tensile and flexural properties of epoxy filled with fly ash-based geopolymer suddenly decrease at a 2.5 solid to liquid ratio. The strength is increasing with the increasing solid to liquid ratio sample of geopolymer filler content.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 215-220
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of urbanization on the sediment yield in tropical watershed using temporal land-use changes and a GIS-based model
    Wpływ urbanizacji na ładunek osadów w tropikalnych zlewniach analizowany na podstawie zmian użytkowania ziemi i w oparciu o model GIS
    Autorzy:
    Bello, A.-A. D.
    Hashim, N. B.
    Haniffah, R. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/292549.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    HSPF model
    land-use
    rainfall
    sediment yield
    tropical watershed
    ładunek osadu
    model HSPF
    opad
    tropikalna zlewnia
    użytkowanie ziemi
    Opis:
    Abundant rainfall areas promote sediment yield at both sub-watershed and watershed scale due to soil erosion and increase siltation of river channel, but it can be curtailed through planned urbanization. The urbanization of Skudai watershed is analysed from historical and future perspective. A GIS-based model (Hydrological Simulation Programme-FORTRAN-HSPF) is used to modelled sediment flow using basin-wide simulation, and the output result is utilized in evaluating sediment yield reduction due to increased urbanization by swapping multiple temporal land-use of decadent time-steps. The analysis indicates that sediment yield reduces with increase urban built-up and decrease forest and agricultural land. An estimated 12 400 tons of sediment will be reduced for every 27% increase in built-up areas under high rainfall condition and 1 490 tons at low rainfall. The sensitivity analysis of land-use classes shows that built-up, forest and barren are more sensitive to sediment yield reduction compared to wetland and agricultural land at both high and low rainfall. The result of the study suggests that increased urbanization reduced sediment yield in proportion to the rainfall condition and can be used as an alternative approach for soil conservation at watershed scale independent of climate condition.
    Duże opady atmosferyczne sprzyjają przemieszczaniu się osadów w skali zlewni w wyniku erozji gleby, powodując zamulanie koryta rzecznego. Procesy te można ograniczyć przez planową urbanizację. Urbanizację zlewni Skudai analizowano w perspektywie historycznej (przedziały 10-letnie) i w kontekście przyszłych zmian. Do modelowania przepływu osadu użyto programu symulacji hydrologicznej Fortran (HSPF), a wyniki modelowania wykorzystano do oceny zmniejszenia ilości osadu związanej z urbanizacją. Analiza wskazuje, że ładunek osadów maleje ze zwiększeniem udziału zabudowy miejskiej oraz z ograniczeniem powierzchni lasów i gruntów rolniczych. W warunkach intensywnych opadów ładunek osadu może zmaleć o 12 400 t, gdy udział terenów zabudowanych zwiększy się o 27%. W warunkach małych opadów ładunek zmniejszy się o 1 490 t. Analiza wrażliwości klas użytkowania ziemi wykazała, że obszary zabudowane, lasy i ugory są bardziej wrażliwe na zmniejszenie ładunku osadu niż obszary podmokłe i grunty rolnicze, zarówno w warunkach dużego jak i małego natężenia opadów. Wyniki badań sugerują, że zwiększony udział terenów zabudowanych ogranicza ładunek osadów proporcjonalnie do ilości opadów, w związku z czym planowa urbanizacja może być wykorzystana jako alternatywne podejście do ochrony gleb w skali zlewni, niezależnie od warunków klimatycznych.
    Źródło:
    Journal of Water and Land Development; 2017, 34; 33-45
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of KCl on the optical and structural properties of CaZnO3 perovskite thin films
    Wpływ KCl na właściwości optyczne i strukturalne cienkich warstw perowskitu CaZnO3
    Autorzy:
    Al-Saqa, Read Hashim
    Jassim, Ismail Kalil
    Uonis, Mohammad Mahmood
    Powiązania:
    https://bibliotekanauki.pl/articles/41159232.pdf
    Data publikacji:
    2023
    Wydawca:
    Wydawnictwo SIGMA-NOT
    Tematy:
    CaZnO3
    perovskite
    energy gap
    diameter’s grain
    perowskit
    przerwa energetyczna
    średnica ziarna
    cienkie warstwy
    Opis:
    The primary goal of this study is to determine whether the produced CaZnO3 perovskite compound may be used in the production of solar cells and diodes. CaZnO3 perovskite thin films have been prepared and examined using scanning electron microscopy (SEM), X-ray spectroscopy, and UV spectroscopy. The films were made using the chemical spray pyrolysis deposition (CSPD) method; they were prepared from a mixture of 0.6 g of CaCl2 and ZnCl2 with 1.2 g of KOH, and CaZnO3 thin films were deposited on a glass substrate at a temperature of 150°C. Optical properties such as transmittance (T), absorbance (A), reflectance (R), the refractive index (n), and extinction coefficient (k) were studied. The energy gap varied from 3.19 eV for films without KCl to 3.22 eV for films with KCl, indicating that the presence of KCl had an impact on the energy gap; furthermore, the average particle’s diameter for films with KCl was about 112.28 nm and decreased to 53.86 nm when KCl was removed from the solutions to obtain pure in CaZnO3 perovskite thin films.
    Wpływ KCl na właściwości optyczne i strukturalne cienkich warstw perowskitu CaZnO3 Głównym celem badania było określenie, czy wytworzony perowskitowy związek CaZnO3 może zostać wykorzystany do produkcji ogniw fotowoltaicznych i diod. Przygotowano cienkie warstwy perowskitu CaZnO3, które zostały zbadane za pomocą skaningowego mikroskopu elektronowego (SEM), spektrometru rentgenowskiego i spektrometru UV. Warstwy zostały wykonane przy użyciu metody chemicznego osadzania pirolitycznego (CSPD); przygotowano je z mieszaniny 0,6 g CaCl2 i ZnCl2 z 1,2 g KOH, cienkie warstwy CaZnO3 osadzono na szklanym podłożu w temperaturze 150°C. Zbadano właściwości optyczne, takie jak transmitancja (T), absorbancja (A), współczynnik odbicia (R), współczynnik załamania światła (n) i współczynnik ekstynkcji (k). Przerwa energetyczna wynosiła od 3,19 eV w wypadku warstw bez KCl do 3,22 eV dla warstw z KCl, co świadczy o tym, że obecność KCl miała wpływ na przerwę energetyczną. Średnica cząstek w warstwach zawierających KCl wynosiła średnio 112,28 nm i zmniejszyła się do 53,86 nm, gdy z roztworów usunięto KCl w celu uzyskania czystych postaci cienkich warstw CaZnO3.
    Źródło:
    Ochrona przed Korozją; 2023, 8; 243-246
    0473-7733
    2449-9501
    Pojawia się w:
    Ochrona przed Korozją
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors influencing the transformation of Iraqi holy cities: the case of Al-Najaf
    Autorzy:
    Farhan, Sabeeh L.
    Antón, Daniel
    Akef, Venus S.
    Zubaidi, Salah L.
    Hashim, Khalid S.
    Powiązania:
    https://bibliotekanauki.pl/articles/35535689.pdf
    Data publikacji:
    2021
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    urban transformation factor
    traditional urban pattern
    heritage
    Al-Najaf
    Iraqi holy cities
    Islamic culture
    Opis:
    The historic centre of the Iraqi city of Al-Najaf embraces a seasonal pilgrimage to its holy sites that forces unusual urban conditions. This paper examines the impact of development projects and studies on the heritage integrity of the public (religious). This paper, therefore, recommends raising public awareness to adopt design approaches to face the overflow of visitors and the loss of heritage identity.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2021, 30, 2; 365-375
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of total petroleum hydrocarbons and polycyclic aromatic hydrocarbons in Musa Bay sediments (northwest of the Persian Gulf)
    Autorzy:
    Tehrani, G. M.
    Hashim, R.
    Sulaiman, A. H.
    Sany, S. B. T.
    Salleh, A.
    Jazani, R. K.
    Savari, A.
    Barandoust, R. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/207391.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    polycyclic aromatic hydrocarbons
    PAH
    petroleum chemistry
    coastal area
    hydrocarbon contamination
    Persian Gulf
    special economic zones
    petroleum hydrocarbons
    wielopierścieniowe węglowodory aromatyczne
    WWA
    ropa naftowa
    pas przybrzeżny
    zanieczyszczenia węglowodorami
    Zatoka Perska
    specjalna strefa ekonomiczna
    węglowodory ropopochodne
    zanieczyszczenia ropopochodne
    zanieczyszczenia substancjami ropopochodnymi
    Opis:
    Sediment samples were collected from the coastal area of the Petrochemical Special Economic Zone of Musa Bay. The samples were analyzed to determine the degree of hydrocarbon contamination and identify the sources of PAHs which were evaluated by employing the ratios of specific PAHs compounds and principal component analysis (PCA). The levels of TPH concentration in the studied area were relatively moderate compared to the world-wide chronically oil-contaminated locations. The concentration of total PAHs was lower than those in other parts of the Musa Bay but approached the NOAA sediment quality guideline value.
    Źródło:
    Environment Protection Engineering; 2013, 39, 1; 115-128
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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