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    Wyświetlanie 1-7 z 7
    Tytuł:
    Reclamation from palm oil mill effluent using an integrated zero discharge membrane-based process
    Autorzy:
    Ahmad, A. L.
    Idris, I.
    Chan, C. Y.
    Ismail, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778766.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    palm oil mill effluent (POME)
    membrane
    wastewater
    water recycling
    carotenes
    Opis:
    This research emphasizes eloquently on membrane technology for treatment of palm oil mill effluent (POME) as it is the Malaysia’s largest and most important agro based industry. Findings established significant quality improvement with an efficient recovery of water from palm oil mill via innovative membrane application. Conventional bio-methods, whilst adhering to the Department of Environment’s (DOE) discharge regulations, produces brownish liquid which pales in comparison to the crystal clear water obtained through membrane treatment. The pre-treatment process consists of coagulation-flocculation using green environmental coagulant bases such as Moringa oleifera (MO) seeds. The ultrafiltration polyvinylidene difluoride (PVDF) and thin film composite (TFC) reverse osmosis were vital for the membrane processes. The system gave 99% suspended solids reduction in suspended solid and 78% of water present was successfully recovered. This technology guarantees water recovery with drinking water quality; meeting the US Environmental Protection Agency (USEPA) standard or could be recycled into the plant with sludge utilization for palm oil estates, thus enabling the concept of zero discharge to be executed in the industries. In addition, green and healthy antioxidants such as oil and beta-carotene can be recovered from POME further demonstrate. Silica gel showed better performance in separation of carotenes from oil at temperature 40°C using adsorption chromatography with 1154.55 ppm. The attractiveness of this technology, enabling the utilization of reuse of agricultural waste into potentially value added products.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 49-55
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary Investigation on the Ballistic Limit of Ultra High Molecular Weight Polyethylene Unidirectional Coated Fabric System
    Wstępne badania balistyczne pakietów z pokrywanych tkanin typu UD wykonanych z polietylenu o ultra wysokiej masie cząsteczkowej
    Autorzy:
    Ahmad, M. R.
    Hassim, N.
    Ahmad, W. Y. W.
    Samsuri, A.
    Yahya, M. H. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/231828.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    unidirectional fabric
    natural rubber latex
    ballistic limit
    energy absorption
    pokrywana tkanina
    kauczuk naturalny
    lateks
    ograniczenia balistyczne
    absorpcja energii
    Opis:
    This paper reports an investigation on the ballistic impact performance of high strength unidirectional (UD) fabrics UHMWPE coated with natural rubber latex (NRL). The effects of adding calcium carbonate in the NRL on the ballistic impact were also studied. Several NRL coated UD fabrics were assembled together with neat UD fabrics in a 12-ply fabric system. The ballistic limit and energy absorption of the fabric systems were determined. Results of the ballistic limit test showed that the NRL coated UD fabrics gave some positive effects in enhancing the ballistic impact performance of the fabric systems in comparison with all-neat fabric systems. Several mechanisms of energy absorption were observed on the fabric systems which include burn marks, fibre stretching, fibre pull-out, shearing, delamination of fabric plies for completely penetrated fabric systems and a punched-out effect on the back ply of partially penetrated fabric systems.
    Badania dotyczyły efektu uderzenia pocisku w balistyczny pakiet wykonany z pokrywanych naturalną gumą tkanin typu UD wykonanych z polietylenu o ultra wysokiej masie cząsteczkowej. Dodatkowo badano wpływ dodania węglanu wapnia do kauczuku naturalnego. W pakietach składano tkaniny powlekane i niepowlekane w systemy zawierające do 12 warstw. Określano limit balistyczny i energię absorpcji uzyskanych pakietów. Wyniki badań wskazują, że powlekanie warstw gumą naturalną daje pozytywne efekty poprawiając zachowanie pakietu na uderzenie pocisku. Obserwowano pojawianie się przypalenia pakietów, rozciąganie włókien, wyciąganie włókien, ścinanie, delaminację pakietów aż do całkowitej penetracji wszystkich warstw systemu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2013, 3 (99); 89-94
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of Conductive Polyethylene Terephthalate Yarns by Deposition of Silver & Copper Nanoparticles
    Otrzymywanie poliestrowych przędz przewodzących poprzez nanoszenie nanocząstek srebra i miedzi
    Autorzy:
    Ahmad, S.
    Ashraf, M.
    Ali, A.
    Shaker, K.
    Umair, M.
    Afzal, A.
    Nawab, Y.
    Rasheed, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/233073.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    coatings
    nanoparticles
    technical yarn
    smart textiles
    powlekanie
    nanocząsteczki
    przędza
    inteligentne tekstylia
    Opis:
    The assemblage of textiles and electronics in a single structure has led to the development of smart textiles for functional purposes and special products. Conductive yarn as a necessary component of smart textiles is being developed by a number of techniques. The objective of the current study was to impart conductivity to yarn by coating the silver and copper nanoparticles on the surface of multifilament polyester textile fibres. The surface morphology and electrical conductivity of the coated yarns were investigated. The wash ability of the conductive yarns developed was also studied. The yarns showed good retention of the nanoparticles, as proven by the very small loss of the conductivity of the material.
    Połączenie tekstyliów i elektroniki w jednej strukturze doprowadziło do rozwoju inteligentnych tekstyliów znajdujących zastosowanie w celach funkcjonalnych i produktach specjalnych. Przędza przewodząca, jako niezbędny składnik inteligentnych wyrobów włókienniczych, może być otrzymywana za pomocą szeregu różnych technik. Celem badania było nadanie przewodnictwa przędzy poliestrowej poprzez powlekanie jej nanocząsteczkami srebra i miedzi. Zbadano morfologię powierzchni i przewodnictwo elektryczne powleczonych przędz, a także ich odporność na pranie. Przędze wykazywały dobrą retencję nanocząstek, co potwierdzała bardzo mała utrata przewodności materiału.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 5 (125); 25-29
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Wildlife Conservation Awareness and practices in some selected secondary school around Kainji Lake National Park, Nigeria
    Autorzy:
    Akande, O. A.
    Ahmad, Y. A.
    Yusuf, H. O.
    Akinade, T. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076522.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Awareness
    Practices and Secondary school
    Wildlife conservation
    Opis:
    One of the challenges facing wildlife conservation is how to change the way people perceive wildlife. Therefore this study examine wildlife conservation awareness and practices in some selected secondary school around Kainji Lake National Park. Data was collected through the use of pre tested structured questionnaires among six selected secondary school in the study area. The sample of the research was one hundred (100) respondents. Data was analysis using descriptive statistics. The findings reveals that majority of the respondents (74%) are male and age group 15-20 years had the highest with 43%. 63% of the respondents are aware of wildlife conservation in the study area and majority (66%) of the respondent has not visit the Kainji Lake National Park. 50% of the respondents had about wildlife through direct communication. 63% and 80% of the respondents are willing and are ready to support wildlife conservation in the study area. The finding still reveal that awareness is still lacking in most schools among the communities. Therefore more wildlife conservation awareness is needed in our various schools so as to get the interest of the students when they are still young so that generation coming will also be thought.
    Źródło:
    World Scientific News; 2019, 115; 91-103
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution and relative density of trees species in Kainji Lake National Park, Nigeria
    Autorzy:
    Akande, O. A.
    Ahmad, Y. A.
    Shuaib, A. B.
    Jeje, C. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1077871.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Distribution
    Kainji Lake National Park
    relative density
    species
    trees
    Opis:
    The importance of trees in the environment cannot be overemphasized. This present study, therefore, deals with the distribution and relative density of trees species in Kainji Lake National Park. Data were collected using plot sampling techniques. Therein, a 50 by 50 m2 plot was randomly laid. Within each sample plot, data on all trees ≥ 10 cm in diameter at breast height were enumerated. The data were analyzed using descriptive statistics. The result shows that different types of plants species were enumerated in the selected plots. This included six families of trees: Fabiaceae, Caesalpiniaceae, Rubiaceae, Maliaceae, Annonaceae and Mimosaceae. The percentage score of tree species in the four plots reveals that Afzelia africana recorded the highest with a total number of 60 species, followed by Detarium macrocarpium with 47 species, while Anogeissus leiocarpus and Azadirachta indica recorded 31 and 17 species, respectively. Gardenia aqualla was the least species recorded. The density and relative density of Afzelia africana recorded the highest, with 1.2ha and 26.9%, followed by Detarium microcarpiuum with 0.94ha and 21.1%, respectively, while Gardenia aqualla was the least with 0.02 ha and 0.4%. In terms of mean height, Daniela oliveri recorded the highest, with 28.1m, followed by Afzelia africana with 21.8%, while Azadirachta indica was the least with 5.8%. The mean DBH of Entada africana and Anogeissus leiocarpus recorded was 28.7cm and 28.1cm, while Prosopis africana and Accacia gournmaensis recorded 14.0 and 13.4, respectively, which were the least. The Types of wild animal species that are associated with the tree species includes Baboon, Kob, Grim duiker, Francolin, Patas monkey etc. Relative abundance of the animal species shows that Papio anubis recorded the highest with 40.5 individuals, while Erythrocebus patas recorded the least with 2.5 individuals.
    Źródło:
    World News of Natural Sciences; 2019, 22; 52-61
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Student Perceptions of Science Teacher Communication Behavior in Jordan
    Autorzy:
    Mahasneh, Ahmad M.
    Musslim, Fawaz Y.
    Shammout, Nizar A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2004926.pdf
    Data publikacji:
    2016-09-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    teacher communication
    student perceptions
    gender differences
    subject differences
    Opis:
    The purpose of this study was to determine student perceptions of science teacher communication behavior in the classroom environment in Jordan. A total of 1,093 participants in the study completed the Teacher Communication Behavior Questionnaire (TCBQ). Results indicated the overall mean of teacher communication behavior to be 3.9 and showed statistically significant differences in gender perceptions on all five scales of the TCBQ. Results also showed statistically significant differences in student perceptions of teacher behavior in biology, physics and mathematics classes on all five scales of the teacher communication behavior.
    Źródło:
    The New Educational Review; 2016, 45; 210-219
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Demarcation energy properties of regenerated fiber Bragg grating sensors in few-mode fibers
    Autorzy:
    Mohd Nazal, N. A.
    Lai, M.-H.
    Lim, K.-S.
    Gunawardena, D. S.
    Chong, W.-Y.
    Yang, H.-Z.
    Ahmad, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/174756.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    regenerated fiber Bragg grating
    thermal regeneration
    thermal decay
    few-mode fibers
    Opis:
    In this work, thermal regeneration of fiber Bragg gratings inscribed in single-mode fibers, two-mode step index fibers and four-mode step index fibers is performed, where the single-mode fibers are used as the reference in the analysis. Specifically, we investigate the behavior of the thermal decay, recovery and eventually the permanent erasure of the gratings in the temperature range from 25 to 1300°C. In the domain of demarcation energy, the thermal responses of the gratings can be normalized and they share similar characteristic curves despite the different temperature ramping rates used in the annealing treatment. It is found that the demarcation energy at the regeneration point and the attempt-to-escape frequency for each grating can be associated with the confinement factors of the fibers. The finding in this work has provided a new insight in the manufacture of regenerated fiber Bragg grating sensors by using few-mode fibers for multiparameter sensing in high temperature environments.
    Źródło:
    Optica Applicata; 2018, 48, 2; 263-271
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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