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    Wyświetlanie 1-9 z 9
    Tytuł:
    Fractographic Evaluation of Crack Initiation and Growth in Al-CNTs Nanocomposite Fabricated by Induction Melting
    Autorzy:
    Mansoor, M.
    Shahid, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402016.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ni
    Opis:
    Presence of reinforcement material in the matrix plays a vital role in modifying the fracture topography besides mechanisms of deformation and strengthening of a composite. In the present study, Al-CNT composite was prepared using induction melting technique. The composite was cast into copper mold and cold rolled to ≈95% reduction in thickness. In as rolled condition, the composite exhibited a simultaneous increase in yield strength (>70%), tensile strength (>50%) and hardness (>40%). The fracture surfaces of the broken tensile specimens were studied using scanning electron microscope. It was observed that the crack initiation was occurred in the matrix followed by void link-ups for its growth. Micro cracks initiation in the matrix played a vital role to sustain the ductility of the material.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-276-B-278
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Bondcoat Thickness on High Temperature Hot Corrosion of ZrO₂-8Y₂O₃ Thermal Barrier Coating
    Autorzy:
    Qureshi, I.
    Shahid, M.
    Khan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402361.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Mq
    81.15.Rs
    Opis:
    Thermal barrier coatings (TBCs) are widely used for industrial and aero turbines. The use of residual fuel oil is well known due to economic reasons, which causes hot corrosion. Hot corrosion over extended exposures reduces durability. Therefore, there is a requirement to develop new design approaches for TBCs in order to operate under hot corrosion environment. In this paper, the effect of bond coat thickness on the hot corrosion resistance was studied. Hot corrosion test were carried out in 50 wt.% Na₂So₄+50 wt.% V₂O₅ molten salt at 950°C for 50 hours. The characterizations of the coatings included X-ray diffraction analysis, scanning electron microscopy and optical microscope. Results indicated that TBCs with thick bond coat exhibited superior hot corrosion resistance to the TBCs with conventional bond coat.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-314-B-316
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement in cotton (Gossypium hirsutum L.) crop yield by water use efficiency under various planting techniques
    Autorzy:
    Ali, L.
    Anum, W.
    Hussain, G.
    Shahid, M.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/9999.pdf
    Data publikacji:
    2017
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    cotton
    Gossypium hirsutum
    crop yield
    water use efficiency
    planting technique
    water saving
    Opis:
    Six experiments were conducted for the enhancement in seed cotton yield by increasing water use efficiency and water savings in case of different planting methods of cotton (Gossypium hirsutum L.) crop during the years 2014 & 2015, at three different locations in cotton zone of Punjab (Pakistan) province. The planting methods were, flat planting and no earthing up, flat planting and earthing up after 1st irrigation, flat planting and alternate row earthing after 1st irrigation, flat planting in 112.5/37.5 cm apart paired rows and earthing up after 1st irrigation, ridge planting and bed planting. Cotton crop obtained a maximum benefit from the available water at all three locations in case of flat planting with alternate row earthing up (P3) by predicting a maximum water use efficiency up to 6.79 kg ha-1 mm-1and maximum seed cotton yield of 3432.50 kg ha-1. Maximum water savings of 25.60% was recorded in the same method (P3) during the year 2014, while minimum (-0.17%) was observed in ridge planting (P5) at location number 1 in the same year.
    Źródło:
    Environment, Earth and Ecology; 2017, 1, 2
    2543-9774
    2451-4225
    Pojawia się w:
    Environment, Earth and Ecology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Does priming promote germination and early stand establishment of french marigold (Tagetes patula L.) seeds by inducing physiological and biochemical changes?
    Czy kondycjonowanie wzmaga kiełkowanie nasion i wschody aksamitki (Tagetes patula L.) poprzez wywołanie zmian fizjologicznych i biochemicznych?
    Autorzy:
    Mukhtar, K.
    Afzal, I.
    Qasim, M.
    Basra, S.M.A.
    Shahid, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/11542535.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Poor plant stand establishment is a common problem for marigold production. Exposure to seed priming is one of the strategies being used to accelerate the activation of plant growth, especially seed germination in many crops. Therefore, an experiment was conducted to investigate the influence of different seed priming techniques on performance of French marigold. For this purpose, different seed priming techniques: hydroprimng, 50 mM CaCl2, 100 mg L⁻¹ salicylic acid and 100 mg L⁻¹ ascorbic acid were assessed. Seeds without any treatment were considered as control. Priming with 50 mM CaCl2 was proved to be the most effective treatment in enhancing germination and seedling vigour among all other treatments including control as shown by higher final germination/emergence, germination energy and lower mean germination/emergence time. Furthermore, positive correlation between reducing sugars and dry weight and α-amylase activity and the concentration of reducing sugars indicates that enhancement due to priming could be attributed to higher reducing and total sugars as well as higher α-amylase activity in primed seeds.
    Słabe wschody to powszechny problem w produkcji aksamitki. Kondycjonowanie jest jedną ze strategii stosowanych w celu przyspieszenia wzrostu roślin, zwłaszcza kiełkowania nasion. Przeprowadzono więc eksperyment mający na celu zbadanie wpływu różnych technik kondycjonowania na rozwój aksamitki. Oceniono różne techniki kondycjonowania nasion: hydrokondycjonowanie, 50 mM CaCl2, 100 mg L⁻¹ kwasu salicylowego oraz 100 mg L⁻¹ kwasu askorbinowego. Kontrolę stanowiły nasiona bez żadnych zabiegów. Okazało się, że kondycjonowanie za pomocą 50 mM CaCl2 było najbardziej skutecznym zabiegiem wzmagającym kiełkowanie i żywotność siewek w porównaniu ze wszystkimi innymi zabiegami, łącznie z kontrolą, co było widoczne na podstawie wyższego końcowego kiełkowania/wschodów, energii kiełkowania oraz mniejszego czasu kiełkowania/wschodów. Ponadto, dodatnia korelacja między cukrami redukującymi a suchą masą i aktywnością α-amylazy a także stężenie cukrów redukujących wskazujące na wzmożony wzrost będący efektem kondycjonowania można przypisywać wyższej zawartości cukrów redukujących i całkowitej zawartości cukrów oraz wyższej aktywności α-amylazy w nasionach poddanych kondycjonowaniu.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2013, 12, 3; 13-21
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A systemic review of existing serological possibilities to diagnose canine osteoarthritis with a particular focus on extracellular matrix proteoglycans and protein
    Autorzy:
    Shahid, M.
    Manchi, G.
    Slunsky, P.
    Naseer, O.
    Fatima, A.
    Leo, B.
    Raila, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/30755.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Extra-cellular matrix (ECM) components are important and their stabilization is significant in maintaining normal healthy joint environment. In osteoarthritis (OA), ECM components are altered and indicate disease progression. The joint ECM is composed of proteoglycans (aggrecan, perlecan, inter α-trypsin inhibitor), glycoproteins (fibronectin, lubricin, COMP) and collagen types (most abundantly collagen type II) which represent structural and functional transformation during disease advancement. ECM investigation revealed significant biomarkers of OA that could be used as a diagnostic and therapeutic tool in different canine orthopedic diseases. This review deliberates our current findings of how the components of ECM change at the molecular level during disease progression in canine OA.
    Źródło:
    Polish Journal of Veterinary Sciences; 2017, 20, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fruit yield and quality of ‘Florida King’ peaches subjected to foliar calcium chloride sprays at different growth stages
    Autorzy:
    Shahid, M.O.
    Muhmood, A.
    Ihtisham, M.
    Rahman, M.ur
    Amjad, M.
    Sajid, M.
    Riaz, K.
    Ali, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/12704034.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Peach fruit and trees are prone to various issues, regarding yield, quality and pest attack. Calcium plays several roles in plant and fruit development. Therefore the current study was conducted to evaluate the response of peach fruit to foliar application. The experiment was laid out in Randomized Complete Block Design with two factors factorial arrangement and three replicates. Calcium chloride was applied at the rate of 0, 1, 2 and 3%. The foliar application of calcium was done at pink bud stage, berry size fruit stage, and then at pit hardening stage of peach. The obtained results indicated that foliar application of calcium significantly improved peach fruit quality and yield. The highest fruit weight (142.6 g), yield tree⁻¹ (15.6 kg), ascorbic acid content (6.67 mg∙100 g⁻¹), total soluble solids (11.0°Bx), fruit juice pH (3.98), sugar to acid ratio (45.1), fruit firmness (3.90 kg∙cm⁻²) and fruit volume (155.6 cm³) was obtained with the application of 3% solution of calcium chloride at pit hardening stage but it significantly reduced the percent titratable acidity (0.3%) and disease incidence (5.8%). It was concluded that 3% calcium chloride applied at the pit hardening stage significantly boosted peach quality and fruit yield.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 1; 131-139
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study on microbial self-healing concrete using expanded perlite
    Autorzy:
    Amjad, Usama Bin
    Siddique, Muhammad Shahid
    Shahid, Taha
    Ahmed, Iftikhar
    Alogla, Saleh M.
    Ahmad, Jawad
    Powiązania:
    https://bibliotekanauki.pl/articles/27311428.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    concrete
    self-healing
    bacteria
    expanded perlite
    crack detection
    beton
    bakteria
    wykrywanie pęknięć
    samonaprawialność
    perlit ekspandowany
    Opis:
    The increasing concern for the safety and sustainability of structures is calling for the development of smart self-healing materials and preventive repair methods. This research is carried out to investigate the extent of self-healing in normal-strength concrete by using Sporosarcina aquimarina – NCCP-2716 immobilized in expanded perlite (EP) as the carrier. The efficacy of crack-healing was also tested using two alternative self-healing techniques, i.e. expanded perlite (EP) concrete and direct introduction of bacteria in concrete. A bacterial solution was embedded in EP and calcium lactate pentahydrate was added as the nutrient. Experiments revealed that specimens containing EP-immobilized bacteria had the most effective crack-healing. After 28 days of healing, the values of completely healed crack widths were up to 0.78 mm, which is higher than the 0.5 mm value for specimens with the direct addition of bacteria. The specimen showed a significant self-healing phenomenon caused by substantial calcite precipitation by bacteria. The induced cracks were observed to be repaired autonomously by the calcite produced by the bacteria without any adverse effect on strength. The results of this research could provide a scientific foundation for the use of expanded perlite as a novel microbe carrier and Sporosarcina aquimarina as a potential microbe in bacteria-based self-healing concrete.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e146475
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction, Chemical Composition and Antidiabetic Potential of Crude Polysaccharides from Centella asiatica (L.) Urban
    Autorzy:
    Li, Meng
    Shahid, Muhammad
    Zhang, Xiaobin
    Law, Douglas
    Mackeen, Mukram M.
    Teh, Arnida H.
    Najm, Ahmad A.
    Fazry, Shazrul
    Othman, Babul A.
    Powiązania:
    https://bibliotekanauki.pl/articles/31341117.pdf
    Data publikacji:
    2024-05-24
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    alcohol insoluble residue
    antidiabetic
    mineral elements
    monosaccharide composition
    response surface methodology
    Opis:
    The global prevalence of diabetes mellitus (DM) is escalating, posing a significant challenge to human healthcare systems. In the present study, mineral and monosaccharide compositions, and antidiabetic potential of polysaccharide fractions separated from Centella asiatica (L.) leaves (CAL) were assessed. Initial single-factor experiments identified key extraction parameters, further optimized through response surface methodology (RSM) with optimal conditions determined as a liquid-to-solid ratio of 24.43:1 (mL/g), extraction time of 60.76 min, and a temperature of 83.31℃. Alcohol insoluble residue (AIR) extraction yielded three crude polysaccharide fractions (P50, P70, and P90). P50 was obtained with the highest yield (14.31%) and exhibited the highest content of total sugars and uronic acids (68.01 and 24.28 g/100 g, respectively). Calcium, magnesium, and manganese were dominant minerals in P50 and P70. Monosaccharide composition analysis via high-performance liquid chromatography (HPLC) demonstrated enrichment of galacturonic acid, galactose, and arabinose in P50 and P70. Furthermore, both fractions (P50 and P70) exhibited dose-dependent inhibitory effects on α-amylase and α-glucosidase. At 5 mg/mL, P50 caused 68.3% α-amylase inhibition and 62.3% α-glucosidase inhibition, while P70 triggered 46.8% and 34.1% inhibition, respectively. In conclusion, this study is the first to provide valuable insights into optimizing CAL extraction conditions. Potential utilization of polysaccharide fractions obtained from CAL as components for formulating functional foods can be explored in the future.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 177-187
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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