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    Tytuł:
    A data-driven approach to predict hydrometeorological variability and fluctuations in lake water levels
    Autorzy:
    Tan Kesgin, Remziye I.
    Demir, Ibrahim
    Kesgin, Erdal
    Abdelkader, Mohamed
    Agaccioglu, Hayrullah
    Powiązania:
    https://bibliotekanauki.pl/articles/28411608.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    evaporation
    lake water level
    precipitation
    stochastic time series models
    water transfer
    Opis:
    Beyşehir Lake is the largest freshwater lake in the Mediterranean region of Turkey that is used for drinking and irrigation purposes. The aim of this paper is to examine the potential for data-driven methods to predict long-term lake levels. The surface water level variability was forecast using conventional machine learning models, including autoregressive moving average (ARMA), autoregressive integrated moving average (ARIMA), and seasonal autoregressive integrated moving average (SARIMA). Based on the monthly water levels of Beyşehir Lake from 1992 to 2016, future water levels were predicted up to 24 months in advance. Water level predictions were obtained using conventional time series stochastic models, including autoregressive moving average, autoregressive integrated moving average, and seasonal autoregressive integrated moving average. Using historical records from the same period, prediction models for precipitation and evaporation were also developed. In order to assess the model’s accuracy, statistical performance metrics were applied. The results indicated that the seasonal autoregressive integrated moving average model outperformed all other models for lake level, precipitation, and evaporation prediction. The obtained results suggested the importance of incorporating the seasonality component for climate predictions in the region. The findings of this study demonstrated that simple stochastic models are effective in predicting the temporal evolution of hydrometeorological variables and fluctuations in lake water levels.
    Źródło:
    Journal of Water and Land Development; 2023, 58; 158--170
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of a Subjective Grading System and Blending with Polyester on Selected Wool and Yarn Characteristics of Subtropical Egyptian Barki Sheep
    Ocena właściwości przędz mieszanych wełna/poliester
    Autorzy:
    Helal, Ahmed
    Agamy, Rania
    Gad Allah, Aymen A. I.
    Al-Betar, Essam M.
    Mahouda, Sabry F.
    Abdel-Mageed, Ibrahim I.
    Powiązania:
    https://bibliotekanauki.pl/articles/232691.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    wool
    yarn
    strength
    elongation
    friction
    polyester blends
    wełna
    przędza
    wytrzymałość
    wydłużenie
    tarcie
    mieszanka wełna-poliester
    Opis:
    Seven-hundred kilograms of subtropical Barki wool was collected to study the effect of a subjective grading system and blending with polyester on selected wool and yarn characteristics. Wool was graded subjectively into coarse, fine and raw; then each grade was blended with 0%, 15%, 25%, 35% and 45% of polyester. Staple and yarn strengths were higher in both coarse and fine grades compared with raw wool. Staple elongation of the fine grade reached 3 times that of coarse grade and twice as much as raw grade. Also, in the 100% wool blend, yarn elongation of the fine grade was twice as much as both coarse and raw grades. The fine grade had the highest yarn friction, followed by other grades. Generally, adding polyester to coarse and fine grades led to an improved yarn strength compared with the raw grade. Adding 15% polyester caused the highest improvement among other percentages. Correlations among traits were also discussed.
    Do badań wykorzystano 700 kg wełny. Dokonano oceny wybranych właściwości wełny i przędz mieszanych wełna/poliester. Wełna była oceniana subiektywnie na grubą, cienką i surową; następnie każdy gatunek został zmieszany z 0%, 15%, 25%, 35% i 45% poliestru. Zbadano wytrzymałość, wydłużenie i współczynnik tarcia przędz. Stwierdzono, że, dodawanie poliestru do grubych i cienkich włókien wełnianych prowadziło do polepszenia wytrzymałości przędz w porównaniu do przędz z włókien surowych. Największą poprawę właściwości spowodowało dodanie 15% poliestru. Omówiono również korelacje między cechami.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2019, 5 (137); 23-27
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth performance, gut morphometry and innate immune profiles of common carp, Cyprinus carpio juveniles fed diet fortified with Mitracarpus scaber leaves extract and its susceptibility to pathogenic bacteria, Aeromonas hydrophila
    Autorzy:
    Adeshina, Ibrahim
    Emikpe, Benjamin O.
    Jenyo-Oni, Adetola
    Ajani, Emmanuel K.
    Abubakar, Musa I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386292.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    Common carp
    feed supplements
    growth performance
    gut morphometry
    immunostimulants
    karp
    wzbogacanie diety
    szybkość wzrostu
    morfometria jelit
    immunostymulanty
    Opis:
    Mitracarpus scaber, an endemic medicinal plant to Nigeria, Africa, has medicinal value. In the present study, Mitracarpus scaber leaves extract (MSLE) was fed to common carp, Cyprinus carpio to evaluate its effect on growth performance, nutrient utilization, gut morphometry, and innate immunity parameters. Four isonitrogenous diets (32% crude protein) containing 0.0, 5, 10, or 15 g MSLE/kg diet were fed to fish (7.52 ±0.23 g) for 12 weeks. After the feeding trial, fish were exposed to pathogenic bacteria (Aeromonas hydrophila) for 14 days. Growth performance, nutrient utilization, and feed intake were significantly improved with increasing MSLE levels up to 10 g/kg diet. Similarly, fish fed MSLE diets increased significantly intestinal villi length/width, and absorption area. Furthermore, activities of respiratory burst, lysozyme, catalase, and superoxide dismutase were significantly higher in fish fed diets containing MSLE levels, and their highest values were obtained at fish fed 15 g MSLE/kg diet. After bacterial challenge, fish mortality was lowest (8.45 ±1.30%) in fish fed 15 g MSLE/kg diet, whereas highest mortality (52.50 ±4.56%) was observed with fish fed the control diet. The present study conjured that MSLE inclusion in fish diets with optimum level of 10 g/kg diet stimulated significantly the performance, nutrient utilization, modified gut morphometry, and innate immune response of common carp. Also, its inclusion protected fish against pathogenic bacteria, A. hydrophila infection.
    Mitracarpus scaber, endemiczna roślina lecznicza z Nigerii w Afryce, ma wartość leczniczą. W niniejszym badaniu ekstrakt z liści Mitracarpus scaber (MSLE) podawano karpiowi, Cyprinus carpio, aby ocenić jego wpływ na szybkość wzrostu, wykorzystanie składników odżywczych, morfometrię jelit i parametry odporności wrodzonej. Cztery izoazotowe diety (32% surowego białka) zawierające 0,0; 5, 10 lub 15 g diety MSLE/kg podawano młodym rybom (7,52 ±0,23 g) przez 12 tygodni. Po tym okresie ryby były narażone na bakterie chorobo-twórcze (Aeromonas hydrophila) przez 14 dni. Szybkość wzrostu, wykorzystanie składników odżywczych i spożycie paszy zwiększały się wraz ze wzrostem poziomu MSLE do wartości 10g/kg diety. Ryby ze wzbogaconą dietą znacznie zwiększyły stosunek długości/szerokości kosmków jelitowych i obszar wchłaniania. Ponadto wielkość wybuchu tlenowego, oraz aktyw-ność lizozymu, katalazy i dysmutazy ponadtlenkowej były znacznie wyższe u ryb karmionych pokarmem wzbogaconym o MSLE. Najwyższe wartości wyżej wspomnianych parametrów uzyskano u ryb karmionych pokarmem wzbogaconym o 15 g MSLE/kg. Po wprowadzeniu bakterii śmiertelność ryb była najniższa (8,45 ±1,30%) u ryb karmionych 15 g diety MSLE/ kg, podczas gdy najwyższą śmiertelność (52,50 ±4,56%) obserwowano u ryb karmionych dietą kontrolną. W niniejszym badaniu wykazano, że włączenie MSLE w ilości 10 g/kg diety zna-cząco stymuluje wydajność, wykorzystanie składników odżywczych, modyfikuje morfometrię jelit i wrodzoną odpowiedź immunologiczną karpia. Włączenie do diety MSLE chroniło ryby przed infekcją bakteriami chorobotwórczymi, A. hydrophila.
    Źródło:
    Acta Biologica; 2019, 26; 5-17
    2450-8330
    2353-3013
    Pojawia się w:
    Acta Biologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat shock increases oxidative stress to modulate growth and physico-chemical attributes in diverse maize cultivars
    Autorzy:
    Hussain, I.
    Ashraf, M.A.
    Rasheed, R.
    Iqbal, M.
    Ibrahim, M.
    Ashraf, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/25486.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    The present investigation was conducted to appraise the physiochemical adjustments in contrasting maize cultivars, namely, PakAfgoi (tolerant) and EV-5098 (sensitive) subjected to heat shock. Seven-day-old seedlings were exposed to heat shock for different time intervals (1, 3, 6, 24, 48 and 72 h) and data for various physiochemical attributes determined to appraise time course changes in maize. After 72 h of heat shock, the plants were grown under normal conditions for 5 d and data for different growth attributes and photosynthetic pigments recorded. Exposure to heat shock reduced growth and photosynthetic pigments in maize cultivars. The plants exposed to heat shock for up to 3 h recovered growth and photosynthetic pigments when stress was relieved. A time course rise in the relative membrane permeability, hydrogen peroxide (H2O2) and malondialdehyde contents was recorded particularly in the EV-5098 indicating that heat shock-induced oxidative stress. Activities of different enzymatic antioxidants greatly altered due to heat shock. For instance, an increase in superoxide dismutase activity was recorded in both maize cultivars. The activity of ascorbate peroxidase was greater in Pak-Afgoi. However, the peroxidase and catalase activities were higher in plants of EV-5098. Heat shock caused a significant rise in the proline and decline in the total free amino acids. Overall, the performance of Pak-Afgoi was better in terms of having lesser oxidative damage and greater cellular levels of proline. The results suggested that oxidative stress indicators (relative membrane permeability, H2O2 and malondialdehyde) and proline can be used as markers for heat shock tolerant plants.
    Źródło:
    International Agrophysics; 2016, 30, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Histopathology of the gills, livers and kidney of Clarias gariepinus (Burchell, 1822) exposed to sniper 1000EC under laboratory conditions
    Autorzy:
    Abubakar, Musa I.
    Adeshina, Ibrahim
    Abdulraheem, Ikililu
    Abdulsalami, Somira
    Powiązania:
    https://bibliotekanauki.pl/articles/1386326.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    Sniper 1000EC
    histopathology
    Clarias gariepinus
    gills
    livers and kidney
    histopatologia
    skrzela
    wątroba i nerki
    Opis:
    Indiscriminate use of Sniper 1000EC has become a serious problem among local fishermen in the Northern parts of Niger state. Juveniles of Clarias gariepinus (mean body weight 23.34 ±0.05 g; mean standard length, 20.00 ±0.45 cm) were subjected to 5 treatment levels of 0, 5, 10, 15 and 20 mg/l. The tissue damages were observed majorly at 15 and 20 mg/l of sniper 1000EC exposed fish species. Oedema and hyperplasia were observed in the gills of the exposed groups. Hepatocellular steatosis and vacuolations were observed in the livers. Tubular nephrosis and hyperplasias of epithelial cells were also observed in the kidney. It is concluded that alterations in gills, livers and kidney of the exposed fish species were consequences of exposure to the toxicant (sniper 1000EC). It is recommended that the use of Sniper 1000EC by local fishermen be banned to save the aquatic environment from destruction.
    Bezkrytyczne stosowanie Sniper 1000EC stało się poważnym problemem dla lokalnych rybaków w północnych częściach Nigru. Młode osobniki Clarias gariepinus (średnia masa ciała 23,34 ±0,05 g; średnia długość 20,00 ±0,45 cm) przetrzymywano w warunkach laboratoryjnych w środowisku zawierającym 0, 5, 10, 15 i 20 mg/l środka Sniper 1000EC. Uszkodzenia tkanek obserwowano głównie przy najwyższych stężeniach (15 i 20 mg/l). Obserwowano obrzęk i przerost skrzeli narażonych ryb. W wątrobie obserwowano stłuszczenie i wakuolację.W nerkach stwierdzono nefrozę i przerost komórek nabłonkowych. Wykazano, że zmiany w skrzelach, wątrobach i nerkach narażonych ryb były konsekwencjami narażenia na działanie insektycydu (Snajper 1000EC). Ze względu na dużą toksyczność zaleca się zakazać używania Sniper 1000EC.
    Źródło:
    Acta Biologica; 2019, 26; 19-30
    2450-8330
    2353-3013
    Pojawia się w:
    Acta Biologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrometallurgical treatment of non-sulfide zinc ore for precipitation of zinc oxide nanoparticles
    Autorzy:
    Abdel-Aal, E.-S. A.
    Rashad, M. M.
    El-Shazly, A. N.
    Ibrahim, I. A.
    El-Shahat, M. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/110748.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zinc ore
    sulfuric acid leaching
    filtration rate
    zinc sulfate
    zinc oxide nanoparticles
    MB photocatalytic degradation
    Opis:
    Acid leaching of Egyptian zinc ore from the Um Gheig area was carried out with sulfuric acid. This study determines the optimum conditions for dissolution of non-sulfide zinc ore. The optimum conditions are 25% -74m particle size, 45 °C temperature, 2 h leaching time, 1.1 stoichiometric molar ratio of H2SO4 to Zn, 1:3 solid/liquid ratio. The maximum filtration rate is 1.6 Mg Zn•m-2•day-1at pressure difference of 0.80 bar. The zinc recovery is about 90%. As the zinc ore contains zinc silicate, some additives were tested to enhance filtration and prevent formation of silica gel. To increase the added value of the product, zinc oxide was precipitated by a co-precipitation method in a nanosize powder with average particle size ~ 20 nm. Photocatalytic degradation of methylene blue dye under UV light using ZnO nanopowders produced at different conditions was investigated. Photocatalytic efficiency with methylene blue (MB) concentration was reduced as much as 85% in 240 min with the produced nanoparticles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 729-737
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Industrial noise level study in a wheat processing factory in Ilorin, Nigeria
    Autorzy:
    Ibrahim, I.
    Ajao, K. R.
    Aremu, S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/265416.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    poziom szumów
    cyfrowy miernik szumów
    hałas
    wheat processing
    noise level
    digital sound meter
    questionnaire
    hearing protector
    Opis:
    An industrial process such as wheat processing generates significant noise which can cause adverse effects on workers and the general public. This study assessed the noise level at a wheat processing mill in Ilorin, Nigeria. A portable digital sound level meter HD600 manufactured by Extech Inc., USA was used to determine the noise level around various machines, sections and offices in the factory at pre-determined distances. Subjective assessment was also mode using a World Health Organization (WHO) standard questionnaire to obtain information regarding noise ratings, effect of noise on personnel and noise preventive measures. The result of the study shows that the highest noise of 99.4 dBA was recorded at a pressure blower when compared to other machines. WHO Class-4 hearing protector is recommended for workers on the shop floor and room acoustics should be upgraded to absorb some sounds transmitted to offices.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 511-523
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measuring wind gradients in agroforestry systems by shaded piche evaporimeters. II. Accuracies obtained in some African case studies
    Autorzy:
    Stigter, C J
    Kainkwa, R.M.R.
    Oteng'i, S.B.B.
    Onyewotu, L.O.Z.
    Mohammed, A.E.
    Ibrahim, A.A.
    Rashidi, M.G.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/26193.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    anemometry
    Piche evaporimeter
    wind reduction
    agroforest system
    Źródło:
    International Agrophysics; 2000, 14, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Medicinal plants for management and alternative therapy of common ailments in Dutsin-Ma (Katsina State) in Nigeria
    Autorzy:
    Sadoq, I.Z.
    Abubakar, F.S.
    Ibrahim, B.
    Usman, M.A.
    Kudan, Z.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048979.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    ethnobotanical survey
    medicinal plants
    traditional herbalist
    common ailments
    alternative therapy
    badanie etnobotaniczne
    rośliny zielarskie
    zielarze ludowi
    typowe schorzenia
    terapia alternatywna
    Opis:
    Introduction: Nowadays, many synthetic drugs comes with various degrees of side effects, accumulative toxicity and development of resistance by microorganisms. Medicinal plants used worldwide can be developed into modern drugs with little or no side effects and greater efficacy. Objective: The aim of this paper was to document the alternative therapy used in Dutsin-Ma local community in Katsina state, Nigeria. Methods: Ethnobotanical survey was carried out among 40 traditional herbalists. Out of 106 plants found, screening was conducted to include only plants that are prescribed simultaneously by the entire herbalists. Results: We have found 32 species of medicinal plants from 20 families that are used for management and alternative therapy against common ailments such as malaria, diabetes, sickle cell anaemia, hypertension, ulcer, paralysis, typhoid fever and immune deficiency. Conclusion: Traditional medicinal plants provide the alternative therapy for treatment and management of diseases to significant number of people. Herbal practitioners are still relevant to African healthcare system.
    Źródło:
    Herba Polonica; 2019, 65, 4; 45-55
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On a mixed-type integral equation and fractional-order functional differential equations
    Autorzy:
    El-Sayed, A. M. A.
    Sherif, Nagwa
    Ibrahim, I. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/745693.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Nonlinear functional integral equation
    fractional calculus
    Volterra operator
    mixed type integral equation
    Schauder fixed point theorem
    Opis:
    In this paper we study the existence of solution of a nonlinear integral equation of (mixed type) Volterra-Fredholm type. As an application we prove the existence of solution of an initial value problem of fractional order in the space of Lebesgue integrable functions on the interval \([0, 1]\).
    Źródło:
    Commentationes Mathematicae; 2005, 45, 2
    0373-8299
    Pojawia się w:
    Commentationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rain-fed plantations of the domesticated Ziziphus mauritiana in the Sahel: effects of varieties and rootstocks on yields and fruit quality
    Autorzy:
    Ibrahim, A.
    Pasternak, D.
    Guimbo, I.D.
    Saidou, A.S.
    Amadou, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2109.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    Ziziphus mauritiana
    domestication
    variety
    rootstock
    agroecology
    Niger
    annual rainfall
    fruit yield
    fruit weight
    Źródło:
    Journal of Horticultural Research; 2015, 23, 1
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Responses of grofth of ladys fingers (Abelmoschus esculentus L.) to different treatments methods of dairy wastewater
    Autorzy:
    Al-Dulaimi, R.I.
    Ismail, N.
    Ibrahim, M.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/51987.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2014, 21, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Different Processing Methods on the Behavior of Minerals Content in Food Products
    Autorzy:
    Alshallash, Khalid S.
    Shahat, Mohamed
    Ibrahim, Mohamed I.
    Hegazy, Ahmed I.
    Hamdy, Ashraf E.
    Elnaggar, Ibrahim A.
    El-Wahed, Abd El-Wahed N. Abd
    Taha, Ibrahim M.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201608.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    mineral
    fruit
    processing
    canning
    dehydration
    stewing
    Opis:
    The goal of the current study was to determine the mineral content of different fruit varieties (Na, K, Ca, P, Mg, Fe, Zn, and Cu), as well as the effects of various processing methods (such as canning, drying, stewing, syrup process, and concentration of juices). All tested fruits that were subjected to various types of processing were exposed to a degree of mineral loss, varying from very little to high reduction. However, it still retains its nutritional value. All fig products have the greatest levels of most tested minerals, compared to other processed fruit products, particularly P and Fe. In turn, orange products supply higher quantities of Ca. On the other hand, apricot products have a comparable value of other minerals with those found in fig and orange products. Among canned juices, guava had the highest contents of Ca, P, and Fe, while mango scored the first juice as Mg and Zn supplying. Canned apricot halves contain the best amounts of K, Ca, P and Mg than the same products of apple and peach. Among jam products, fig jam has higher amounts of Na, Ca, P, Mg, and Fe than those found in other fruit jams. The concentration of fruit juices by vacuum-heating or dehydration of fruit produced higher mineral retentions than the fruit products that were processed by other techniques. The concentrated orange juice by vacuum-heating processing retained most of the minerals found in raw juice, also dried apricot sheet retained higher minerals than those retained in dehydrated whole apricot.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 263--275
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-phases bubble column to polyethylene terephthalate depolymerization for cement mortar composites improvement
    Autorzy:
    Hameed, A. M.
    Alzuhairi, M.
    Ibrahim, S. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172162.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    depolymerization
    DPET
    plastic waste
    bubble column
    mortar
    water absorption
    flexural strength
    depolimeryzacja
    odpady z tworzyw sztucznych
    kolumna barbotażowa
    zaprawa
    absorpcja wody
    wytrzymałość na zginanie
    Opis:
    Purpose This paper aims to prepare depolymerized polyethylene terephthalate (DPET) powder from recycled plastic water bottles. Adding this DPET powder to the cement mortar was also studied. Design/methodology/approach The adopted PET depolymerization process includes the usage of both ethylene glycol (EG) as solvent and nano-MgO as a catalyst. A bubble column reactor was designed for this process. Five different mortar groups were made; each has different DPET content of 0%, 1%, 3%, 6% and 9% as a sand replacement. The flexural strength test and the water absorption measurement are done after two curing periods: 7 and 28 days. Findings The research finding demonstrated that the flexural strength of mortar was reduced by increasing the DPET powder percentage and the maximum dropping was 15% when 9% of DPET was added. The ability of the mortar to absorb the water was reduced by 14.5% when DPET powder was 9%. The mortar microstructure is featured with fewer cavities and porosity. Research limitations/implications This work’s employed bubble column technique is limited only to the laboratory environment and needs to be scaled up within industrial mass production. For future research, it is suggested to decrease depolymerization time by using smaller pieces of plastic water bottle waste and trying other types of nanocatalyst. Practical implications The modified mortar can be utilized in areas where moisture, rainfalls, and sanitation systems exist. Originality/value The article claims that depolymerized waste PET improves chemical process efficiency by lowering reaction time and improving mass and heat transfer rates. Besides, this approach saves money. It is found out that the depolymerized plastic waste is much more functional due to its high cohesion capability than being used as small PET pieces.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 1; 5--12
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Throughput, Spectral, and Energy Efficiency of 5G Massive MIMO Applications Using Different Linear Precoding Schemes
    Autorzy:
    Salah, Ibrahim
    Rahouma, Kamel Hussein
    Hussein, Aziza I.
    Mabrook, M. Mourad
    Powiązania:
    https://bibliotekanauki.pl/articles/2203002.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    throughput
    massive MIMO
    spectral efficiency
    energy efficiency
    trade-off
    Opis:
    On fifth-generation wireless networks, a potential massive MIMO system is used to meet the ever-increasing request for high-traffic data rates, high-resolution streaming media, and cognitive communication. In order to boost the trade-off between energy efficiency (EE), spectral efficiency (SE), and throughput in wireless 5G networks, massive MIMO systems are essential. This paper proposes a strategy for EE 5G optimization utilizing massive MIMO technology. The massive MIMO system architecture would enhance the trade-off between throughput and EE at the optimum number of working antennas. Moreover, the EE-SE tradeoff is adjusted for downlink and uplink massive MIMO systems employing linear precoding techniques such as Multiple -Minimum Mean Square Error (M-MMSE), Regularized Zero Forcing (RZF), Zero Forcing (ZF), and Maximum Ratio (MR). Throughput is increased by adding more antennas at the optimum EE, according to the analysis of simulation findings. Next, utilizing M MMSE instead of RZF and ZF, the suggested trading strategy is enhanced and optimized. The results indicate that M-MMSE provides the best tradeoff between EE and throughput at the determined optimal ratio between active antennas and active users equipment’s (UE).
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 1; 185--191
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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