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    Tytuł:
    Cycle-to-cycle variations of a diesel engine operating with palm biodiesel
    Autorzy:
    Yasin, M. H.
    Mamat, R.
    Abdullah, A. A.
    Abdullah, N. R.
    Wyszynski, M. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/950092.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    cycle-to-cycle variations
    biodiesel
    combustion
    diesel engine
    Opis:
    Biodiesel is one of biodegradable and renewable fuel, which is originated from vegetable oil or animal fats. Different fuel properties of biodiesel produce different combustion characteristics which slightly differ to mineral diesel. Combustion studies on palm-biodiesel and mineral diesel were conducted using a multi-cylinder diesel engine operating at medium engine load at 2500 rpm. The engine was water cooled inline four cylinder diesel engines without exhaust gas recirculation system. Cycle-to-cycle variations of peak cylinder pressure and mean indicated pressure of the test fuels were determined for the combustion characteristics of diesel engine. In-cylinder pressure data for the 200 consecutive cycles were determined using a Kistler pressure transducer and recorded into a combustion analyser. Three different engine loads: 20%, 40% and 60% were selected in this study with a constant engine speed of 2500 rpm. The results show that at lower load, in-cylinder pressure variations for palm biodiesel were lower compared to mineral diesel. However, at medium and high loads, palm biodiesel has dominated the peak cylinder variations. Different combustion cyclic variations for mineral diesel and B100 are observed and generally influenced by psychochemical properties differences including viscosity and density of fuel.
    Źródło:
    Journal of KONES; 2013, 20, 3; 443-450
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of injection pressure and strategy in a Jaguar V6 diesel engine
    Autorzy:
    Abdullah, N. R.
    Mamat, R.
    Rounce, P.
    Wyszynski, M. L.
    Tsolakis, A.
    Xu, H. M.
    Tian, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/242414.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion
    emissions
    injection strategies
    premixed combustion
    ignition delay
    Opis:
    In recent years, the improvement of engine performance and emissions has become an extremely important concern. This study focuses on the injection strategy based on the injection pressure (IP) and duration between pilot injection and the main injection (dMI) using a multi cylinder common rail multiple injections diesel engine. The study was designed to produce improvements in fuel mixing via the injection strategy, to reduce the main ignition delay. This would contribute to a minimum amount of fuel burnt in the premixed combustion phase, leading to a reduction in emissions. Recent evidence shows that premixed combustion is significant in the controlling of emissions of nitrogen oxides (NOx) and soot. Six different IPs combined with a short and long dMI were compared in the attempt to improve engine performance and emissions. The engine performance was measured in terms of brake specific fuel consumption, ignition delay, heat release and peak in-cylinder pressure and emissions, specifically nitrogen oxides (NOx), total unburned hydrocarbons (THC), carbon monoxide (CO) and smoke emissions for each engine test condition. The evidence from this study shows that the effect of IP is more dominant than dMI in terms of peak cylinder pressure, heat release, brake specific fuel consumption and emissions. However, the dMI shows a strong effect at a higher engine speed.
    Źródło:
    Journal of KONES; 2009, 16, 2; 9-22
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Enhancement of Chaotic Error Correction Coding Using Consecutive Sequences
    Autorzy:
    Sahar, Asaad H.
    Abdullah, Hikmat N.
    Saed, Thamir R.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200739.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    chaos communication
    DCSK modulation
    error correction
    suboptimal receiver
    Opis:
    The use of chaotic dynamics for error correction is the subject of extensive research, as the approach allows to avoid the use of redundant data. This work proposes a new technique for non-coherent chaos communications for modifying error-correction depending on chaotic dynamics. In the proposed system, there are two consecutive sequences created from a comparable chaotic map, with the second series being created as the latest value of the initial one. Generation of a sequential chaotic sequence with a comparable chaotic dynamic delivers additional information to the receiver, allowing it to appropriately recover information and, hence, facilitate the receiver’s bit-error performance. For error correction and for detecting the symbol that is transmitted, a suboptimal technique based on the nearest distance between chaotic map trajectories over the n-dimensional sequence received is utilized. Simulation results show that the proposed error correction approach improves Eb/N0 as the dimension of the trajectory map increases, indicating that the method improves overall error correction performance. With the dimension of 4, a gain of 0.8 dB in Eb/N0 is achieved compared with an approach without any error-correcting schemes, at the bit-error probability of 10−3.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 2; 10--16
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Improved M-ary Modulation Scheme Based on Chaotic Dynamics
    Autorzy:
    Abdullah, Hikmat N.
    Sahar, Asaad H.
    Saeed, Thamir R.
    Powiązania:
    https://bibliotekanauki.pl/articles/958105.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    chaos
    M-ary modulation
    non-coherent detection
    zigzag map
    Opis:
    This paper proposes an improved chaos-based M-ary modulation system. It reproduces deterministic chaotic dynamics to create M-ary non-coherent modulation. The proposed modulation system transmits data using autonomous chaotic sequences. It separates the chaotic dynamics through the use of interleavers and realigns them through the use deinterleavers. The simulation results show that the improved scheme overperforms its traditional counterpart. The degree of improvement grows as the M-ary order is increased, with a penalty of increased system complexity.
    Źródło:
    Journal of Telecommunications and Information Technology; 2019, 4; 13-19
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic-assisted synthesis of reactive carboxymethyl cellulose stabilized nano zero-valent iron and its application for removal of Cr6+ and Cu2+ ions
    Autorzy:
    Ayob, A.
    Santiagoo, R.
    Amneera, W. A.
    Ismail, N.
    Abdullah, A. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/207403.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    high resolution transmission
    electron microscopy
    light scattering
    transmission electron microscopy X ray diffraction
    zero-valent iron
    wysoka rozdzielczość transmisyjna
    mikroskopia elektronowa
    dyfrakcja rentgenowska
    żelazo
    Opis:
    Carboxymethyl cellulose (CMC) was used in the chemical reduction using sodium borohydride to yield dispersive nano zero-valent iron (nZVI) particles as reactive and stable adsorbents. CMC- -stabilized nZVI particles were characterized via UV-visible light spectroscopy, X-ray diffraction, dynamic light scattering, transmission electron microscopy, and specific surface area assisted using a probe ultrasonication dispersing tool at 50% amplitude power. High catalytic reactivity obtained in pseudo-first order reaction for Cr6+ (rate constant K1 = 0.0311 min–1) and pseudo-second order for Cu2+ (rate constant K2 = 0.0946 g·mg–1·min–1) indicated that colloidal stability of nZVI particles can be achieved with a stabilizer for the removal of toxic contaminants.
    Źródło:
    Environment Protection Engineering; 2016, 42, 2; 55-79
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some physical properties of ginko nuts and kernels
    Autorzy:
    Ch'ng, P.E.
    Abdullah, M.H.R.O.
    Mathai, E.J.
    Yunus, N.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24875.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    Some data of the physical properties of ginkgo nuts at a moisture content of 45.53% (±2.07) (wet basis) and of their kernels at 60.13% (± 2.00) (wet basis) are presented in this paper. It consists of the estimation of the mean length, width, thickness, the geometric mean diameter, sphericity, aspect ratio, unit mass, surface area, volume, true density, bulk density, and porosity measures. The coefficient of static friction for nuts and kernels was determined by using plywood, glass, rubber, and galvanized steel sheet. The data are essential in the field of food engineering especially dealing with design and development of machines, and equipment for processing and handling agriculture products.
    Źródło:
    International Agrophysics; 2013, 27, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pattern of tree diversity in lowland tropical forest in Nikiwar, West Papua, Indonesia
    Autorzy:
    Murdjoko, A.
    Djitmau, D.A.
    Ungirwalu, A.
    Sinery, A.S.
    Siburian, R.H.S.
    Mardiyadi, Z.
    Wanma, A.O.
    Wanma, J.F.
    Rumatora, A.
    Mofu, W.Y.
    Worabai, D.
    May, N.L.
    Jitmau, M.M.
    Mentansan, G.A.F.
    Krey, K.
    Musaad, I.
    Manaf, M.
    Abdullah, Y.
    Mamboai, H.
    Pamuji, K.E.
    Raharjo, S.
    Kilmaskossu, A.
    Bachri, S.
    Nur-Alzai, N.
    Benu, N.M.H.
    Tambing, J.
    Kuswandi, R.
    Khayati, L.
    Lekitoo, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078261.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    dendrogram
    conservation
    Importance Value Index
    Shannon-Weiner
    understory
    Opis:
    Trees are significant components of ecosystems built by several widespread species. For instance, Papua forest is known to comprise abiotic and biotic elements. Also, certain plants have grown in popu- larity to a point where they are discovered almost everywhere. The purpose of this study, therefore, was to investigate tree diversity, distribution, and the importance of conservation. Data were collected in four locations using a total of 24 sample plots spread across Idoor, Karst, Persemaian, and Torembi, where seven, four, seven, and five plots were allocated, respectively. These forests formed a mixed natural plantation comprising 76 species from 35 families. Furthermore, Idoor and Karst generated the highest species diver- sity and varied significantly compared to Persemaian, while Torembi showed similarities with the other three locations. This condition formed three ecosystem communities across Persemaian, Karst, Idoor, and Torembi. Also, the composition of the dominant species showed variations at the seedling and sapling levels believed to structure the understory, while the pole and tree levels characterized the overstory. The total species status was described as critically endangered (CR) of two species, vulnerable (VU) of six species, least con- cern (LC) of 28 species, and data deficient (DD) species. Therefore, location management is advised to not only pay significant attention in terms of economic benefits but also ecological, including the provisions for ex-situ and in-situ conservation to support sustainable forest management.
    Źródło:
    Dendrobiology; 2021, 85; 78-91
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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