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Wyszukujesz frazę "Saeed, Muhammad" wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Investigating the factor of safety for the design of columns using properties of steel rebar’s manufactured in Pakistan
    Autorzy:
    Zaidi, Safdar Abbas
    Saeed, Muhammad Arsalan
    Haider, Farhan
    Powiązania:
    https://bibliotekanauki.pl/articles/1849760.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    współczynnik redukcji wytrzymałości
    analiza wytrzymałościowa
    interakcja
    moment obciążenia
    pręt stalowy
    słup
    strength reduction factor
    strength analysis
    load moment
    interaction
    steel rebar
    column
    Opis:
    This paper includes the behaviour of RC column, using the steel strength data employed by Rafi et al. (2014). Eccentric short columns are studied for this purpose, both tension and compression controlled sections, are analysed considering the current design practice of Pakistan. Three cross sections were analysed using different steel percentages against load-moment interaction and the strength analyses. Concrete strength is also varied in this analysis. The load moment interaction diagrams were observed in major and minor axes and strength analysis is made for compression controlled and tension controlled sections. In this analysis it is observed that a section designed as a tension controlled is giving brittle failure at certain limit which should be avoided. Considering this scenario, several random cross sections are analysed, strength reduction factors for eccentric and pure axial columns are computed. Conclusions are made on behalf of this analysis for different types of column design.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 4; 61-78
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flexure Behavior of Carbon Fiber Reinforced Polymers Retrofitted RC Beams
    Autorzy:
    Fahim, Muhammad
    Saeed, Muhammad
    Khan, Haris
    Gir, Alam
    Ullah, Shahid
    Powiązania:
    https://bibliotekanauki.pl/articles/2180600.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    CFRP
    retrofitting
    strengthening
    debonding
    reinforced concrete structures
    Opis:
    Carbon fiber reinforced polymers (CFRP) have been widely used for retrofitting of reinforced concrete members over the past three decades. This study presents the experimental results of four reinforced concrete beams retrofitted with CFRP and tested under four point monotonic loading. CFRP strips (Sika Carbo-Dur S812) and wraps (Sika-Wrap 230C) were used in two different patterns to evaluate their effect on the flexural behavior of RC beams. Two beams were first tested until their ultimate capacity, retrofitted with the application of CFRP and re-tested again, and two beams were retrofitted before the application of any load. The CFRP strips provided in the middle one-third of the span with U-shaped anchorage at the ends enhanced the capacity of beams up to 15 percent. The stiffness of the beams were significantly increased as demonstrated by smaller displacement at the ultimate load. However, the CFRP wraps provided without the anchorage didn’t enhance the strength due to pre-mature debonding.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 2; 188--195
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation induced degradation of Congo red dye: a mechanistic study
    Autorzy:
    Muner, Majid
    Saeed, Muhammad
    Bhatti, Ijaz Ahmad
    Haq, Atta-ul
    Khosa, Muhammad Kaleem
    Jamal, Muhammad Asghar
    Ali, Saddaqat
    Powiązania:
    https://bibliotekanauki.pl/articles/146490.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Congo red
    radiolytic product
    irradiation
    advanced oxidation process
    Opis:
    Synthetic dyes are persistent pollutants with poor biodegradability. The present study is about the degradation of direct Congo red dye in aqueous media using the Co-60 gamma radiation source. The experimental conditions such as gamma-ray absorbed doses, amount of oxidant (H2O2) and pH conditions were evaluated. The lambda max of dye solution was noted as 498 nm, and then, decrease in absorbance and reduction in chemical oxygen demand (COD) were examined. The complete colour removal of dye was observed at 5 kGy, while a signifi cant COD removal was observed at 15 kGy gamma-ray absorbed dose in conjunction with oxidant for 50 mg/L concentration. It was found that pH has no influence on degradation efficiency. A possible degradation pathway was proposed. The radiolytic end products were monitored by Fourier transform infrared (FTIR) and gas chromatography coupled with mass spectrometry (GC-MS) to explore the degradation mechanism. It was imperative to study the oxidative degradation pathway to provide directions for potential applicability of advanced oxidation process (AOP) in industrial wastewater treatment.
    Źródło:
    Nukleonika; 2019, 64, 2; 49-53
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bamboo as a Construction Material: Prospects and Challenges
    Autorzy:
    Fahim, Muhammad
    Haris, Muhammad
    Khan, Wajid
    Zaman, Saeed
    Powiązania:
    https://bibliotekanauki.pl/articles/2201749.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    bamboo
    engineered bamboo
    reinforced concrete
    bamboo reinforced concrete
    bamboo fibers
    bamboo construction
    laminated bamboo
    Opis:
    Bamboo is a naturally available, fast growing and renewable resource. Bamboo plants are found all over the world in tropical and non-tropical regions. Asia pacific region is specifically rich in bamboo biodiversity. Due to high energy demand of existing construction materials and scarcity of other naturally available materials like wood, bamboo is a good alternative for construction. This paper reviews the mechanical properties and use of bamboo in construction. The tensile strength of different bamboo species varies in the range 70-210 MPa, compressive strength 20-65 MPa, elastic modulus 2500-17500 MPa, and modulus of rupture 50-200 MPa. Bamboo is a versatile material and can be used in construction in various ways. Bamboo can be engineered to specific need in construction such as laminated and scrimber bamboo. Engineered bamboo are used for various housing purposes such as roofing and flooring. Bamboo culms are often used directly without any alteration as structural members such as beams and columns. Bamboo can also be used as reinforcement in concrete as a replacement to steel. The shear and flexural behavior of bamboo reinforced concrete (BRC) beams is significantly better than plain concrete beams. Bamboo fibers reinforced concrete (BFRC) is a good alternative to existing synthetic fibers reinforced concrete such as glass and steel fibers. Development of standardized testing procedures and structural specifications utilizing existing and future research findings will pave the way towards an extensive use of bamboo in construction industry.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 3; 165--175
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probing 3D chaotic Thomas’ cyclically attractor with multimedia encryption and electronic circuitry
    Autorzy:
    Khan, NajeebAlam
    Qureshi, Muhammad Ali
    Akbar, Saeed
    Ara, Asmat
    Powiązania:
    https://bibliotekanauki.pl/articles/27312000.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Thomas’ cyclically attractor
    fractional calculus
    chaos
    encryption
    Opis:
    This study investigates Thomas’ cyclically symmetric attractor dynamics with mathematical and electronic simulations using a proportional fractional derivative to comprehend the dynamics of a given chaotic system. The three-dimensional chaotic flow was examined in detail with Riemann-Liouville derivative for different values of the fractional index to highlight the sensitivity of chaotic systems with initial conditions. Thus, the dynamics of the fractional index system were investigated with Eigenvalues, Kaplan-Yorke dimension, Lyapunov exponent, and NIST testing, and their corresponding trajectories were visualized with phase portraits, 2D density plot, and Poincaré maps. After obtaining the results, we found that the integer index dynamics are more complex than the fractional index dynamics. Furthermore, the chaotic system circuit is simulated with operational amplifiers for different fractional indices to generate analog signals of the symmetric attractor, making it an important aspect of engineering. The qualitative application of our nonlinear chaotic system is then applied to encrypt different data types such as voice, image, and video, to ensure that the developed nonlinear chaotic system can widely applied in the field of cyber security.
    Źródło:
    Archives of Control Sciences; 2023, 33, 1; 239--271
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorbent filters for removing polycyclic aromatic hydrocarbons from the atmosphere
    Autorzy:
    Khan, Abdul Muqeet
    Imran, Muhammad
    Hashmi, Abu Saeed
    Shehzad, Wasim
    Abbas, Mateen
    Powiązania:
    https://bibliotekanauki.pl/articles/24201031.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    polycyclic aromatic hydrocarbons
    PAHs
    electrostatic precipitation
    adsorption
    Pakistan
    wielopierścieniowe węglowodory aromatyczne
    WWA
    filtr elektrostatyczny
    adsorpcja
    Opis:
    Indoor activities involving cooking and warming, outdoor sources, smoking, and candle and in-cense burning may introduce a massive portion of polycyclic fragrant hydrocarbons. These are well known for their mutagenicity and carcinogenicity and are omnipresent in urban situations as a result of the combustion of fuel. Due to small particle size, penetration has been suspected to be one major source of indoor polycyclic aromatic hydrocarbons. In the current study, the manufacturing of three types of filters (electrostatic charge-based, pomegranate peel biochar-based, and birds’ feathers-based) was carried out. Their efficiency was tested to remove molecules bounded PAHs and also other geno-toxic compounds associated with these particles. The electrostatic filter was more efficient (27.42%) than pomegranate peel-based and birds’ feathers-based filters (13.86% and 8.32%, respectively). The carcinogenetic effects of PAHs emitted from outdoor and indoor pollutants can be reduced using these kinds of filters.
    Źródło:
    Environment Protection Engineering; 2023, 49, 2; 19--27
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Rice Husk Ash as Partial Replacement of Cement in Sandcrete Blocks
    Autorzy:
    Wajid, Khan
    Fahim, Muhammad
    Zaman, Saeed
    Khan, Sajjad Wali
    Badrashi, Yasir Irfan
    Khan, Fayaz
    Powiązania:
    https://bibliotekanauki.pl/articles/2023978.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    compressive strength
    Rise husk ash
    sandcrete blocks
    masonry unit
    pozzolanic
    Opis:
    This paper presents the outcome of a research study aimed at the performance evaluation of rice husk ash as partial replacement of cement in sandcrete blocks used as masonry units. Rice husk from rice cultivated in the North of Pakistan was used in the study. It was first combusted in a locally manufactured incinerator to convert it into rice husk ash (RHA) and then finely ground to powder form for use with cement. Blocks of size 305 mm×203 mm×152 mm were molded with 0, 10, 30, 40 and 50 % replacement of cement with RHA to find compressive strength at 3, 7, 14 and 28 days age of curing. The results showed that water requirement for the required workability of the sandcrete increased with increase in RHA content whereas compressive strength decreased with increase in RHA content. However, the comparison of compressive strengths of RHA sandcrete blocks with the strength of commercial concrete blocks available in the market and used as masonry units in Pakistan showed that sandcrete blocks having sand to binder ratio of 1:8 and using up to 40% of RHA as replacement of cement gave larger compressive strength than that of commercial concrete blocks and only marginally lower strength for 50% replacement.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 2; 101-107
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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