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    Wyświetlanie 1-8 z 8
    Tytuł:
    Simulation Based Measuring the Benefits of Converting to Lean Product Design and Development: A Case Study of Manufacturing Sector of Pakistan
    Autorzy:
    Sajid, Muhammad
    Wasim, Ahmad
    Hussain, Salman
    Jahanzaib, Mirza
    Powiązania:
    https://bibliotekanauki.pl/articles/102672.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    decision making
    discrete event simulation
    lean product development
    lean enablers
    podejmowanie decyzji
    dyskretna symulacja zdarzeń
    rozwój produktu tańszego
    umożliwienie tańszego działania
    Opis:
    Designers are facing the principal problems of effective decision making at the initial design stage of product development, which ultimately contribute to profit loss, low quality and increased time to launch the product onto the market. It requires a lot of knowledge and experience. Tools are required to analyze and ensure that crucial decisions have strong foundation before implementation. Discrete event simulation provides such a tool and has got potential to assist in decision making before final implementation. This research work aims measuring the benefits of transformation to lean product development (LPD) via simulation. Simulink-MATLAB tool was used for this purpose. The whole work is limited to design and cost estimation cells of a manufacturing company and consists of two phases. The first phase deals with the assessment of current working model of design and cost estimation cells. The areas for improvements were recognized at this phase. The proposed model for transformation to LPD was developed in the second phase. Four lean enablers namely product values, knowledge-based engineering, set-based concurrent engineering and poke-yoke were incorporated to further enhance the operation of the proposed model. This research work constitutes a useful case for practitioners. Keywords: decision making, discrete event simulation, lean product development, lean enablers
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 1; 128-137
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the effect of wire electric dischage machining process parameters on the formation of high speed steel form tool
    Autorzy:
    Ishfaq, Kashif
    Mufti, Nadeem Ahmad
    Jawad, Muhammad
    Sajid, Muhammad
    Jahanzaib, Mirza
    Powiązania:
    https://bibliotekanauki.pl/articles/103183.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wire electrical discharge machining (WEDM)
    response surface methodology (RSM)
    ANOVA
    material removal rate (MRR)
    surface roughness (Ra)
    wycinanie elektroerozyjne drutem
    metoda powierzchni odpowiedzi (RSM)
    wskaźnik usuwania materiału (MRR)
    chropowatość powierzchni (Ra)
    Opis:
    The use of form tools is growing in industry, owing to their inherent advantage of improving productivity. However, the accurate formation of form tool profile is a really tedious task. In this research work, wire electric discharge machining (WEDM) process has been used for the generation of a form tool. Pulse on-time, pulse off-time, servo voltage, wire tension, flushing pressure have been considered as input parameters, whereas tool geometry (clearance angle, included angle), surface roughness and material removal rate are the selected responses. Response surface methodology (RSM) (Box Bhenken experimental design) technique has been used for design of experiments. Analysis of Variance (ANOVA) has shown that pulse on-time and pulse off-time are the two influential control factors for material removal rate (MRR), surface roughness (Ra), clearance angle and included angle. Contour plot analysis has been performed to find out the optimal ranges of the most influential control factors for each response characteristics.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 1; 89-98
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of bentonite nanoclay for textile application
    Modyfikacja nano bentonitu do zastosowań włókienniczych
    Autorzy:
    Amir, Muhammad
    Hasany, Syed Farhan
    Asghar, Muhammad Sajid Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/24202774.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    bentonite
    textile fabrics
    mechanical properties
    bentonit
    tekstylia
    właściwości mechaniczne
    Opis:
    The influence of the bentonite content (1, 3, 5 wt%) on the mechanical properties of lightweight cotton (C), polyester (P) and polyester-cotton (P/C 50/50) fabrics was investigated. Starch was used as a water-insoluble binder for coating fabrics. Bentonite nanoparticles were obtained by repeated hydration, decantation and evaporation of the water dispersion. The bentonite particle size was determined by the XRD method using the Debye-Scherrer equation. The diffraction of the laser beam was used to determine particles size distribution. The addition of bentonite nanoclay significantly improved tensile strength (26-61% and 99–118% in the warp and weft direction, respectively) and tear strength (4‒13% and 5–24% in the wrap and weft direction, respectively) of coated fabrics. Their abrasion resistance has also slightly increased. The biggest changes were noted for the cotton fabric, the smallest for the polyester fabric, which may result from the low compatibility between starch and the polyester fabric.
    Zbadano wpływ zawartości bentonitu (1, 3, 5% mas.) na właściwości mechaniczne lekkich tkanin bawełnianych (C), poliestrowych (P) i poliestrowo-bawełnianych (P/C 50/50). Jako nie-rozpuszczalny w wodzie środek wiążący do powlekania tkanin zastosowano skrobię. Nanocząstki bentonitu otrzymywano poprzez kilkukrotną hydratację, dekantację i odparowanie dyspersji wodnej. Wielkość cząstek bentonitu oznaczono metodą XRD, stosując równanie Debye-Scherrera. Dyfrakcja wiązki laserowej posłużyła do określenia rozkładu wielkości cząstek. Zastosowanie nanoglinki bentonitowej wpłynęło na istotną poprawę wytrzymałości na rozciąganie (o 26‒61% w kierunku osnowy i 99‒118% w kierunku wątku) oraz rozdzieranie (4‒13% w kierunku osnowy i 5‒24% w kierunku wątku) powlekanych tkanin. Nieznacznie zwiększyła się również ich odporność na ścieranie. Największe zmiany zanotowano w przypadku tkaniny bawełnianej, najmniejsze dla tkaniny poliestrowej, co może wynikać z małej kompatybilności między skrobią a tkaniną poliestrową.
    Źródło:
    Polimery; 2023, 68, 2; 79--85
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial Intelligence Based Flood Forecasting for River Hunza at Danyor Station in Pakistan
    Autorzy:
    Yaseen, Muhammad Waseem
    Awais, Muhammad
    Riaz, Khuram
    Rasheed, Muhammad Babar
    Waqar, Muhammad
    Rasheed, Sajid
    Powiązania:
    https://bibliotekanauki.pl/articles/31340346.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    hydrometeorology
    random forest
    support vector
    multilayer perceptron
    machine learning
    flood forecasting
    Opis:
    Floods can cause significant problems for humans and can damage the economy. Implementing a reliable flood monitoring warning system in risk areas can help to reduce the negative impacts of these natural disasters. Artificial intelligence algorithms and statistical approaches are employed by researchers to enhance flood forecasting. In this study, a dataset was created using unique features measured by sensors along the Hunza River in Pakistan over the past 31 years. The dataset was used for classification and regression problems. Two types of machine learning algorithms were tested for classification: classical algorithms (Random Forest, RF and Support Vector Classifier, SVC) and deep learning algorithms (Multi-Layer Perceptron, MLP). For the regression problem, the result of MLP and Support Vector Regression (SVR) algorithms were compared based on their mean square, root mean square and mean absolute errors. The results obtained show that the accuracy of the RF classifier is 0.99, while the accuracies of the SVC and MLP methods are 0.98; moreover, in the case of flood prediction, the SVR algorithm outperforms the MLP approach.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2022, 69, 1; 59-77
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    BOX BEHNKEN DESIGN: A STATISTICAL APPROACH TO EVALUATE THE EFFECT OF CROSSLINKED CARBOXYMETHYL CELLULOSE AND SODIUM STARCH GLYCOLATE ON RELEASE KINETICS OF DRUG
    Autorzy:
    Hanif, Muhammad
    Abbas, Ghulam
    Rasul, Akhtar
    Khan, Sajid M.
    Amir, Muhammad N.
    Powiązania:
    https://bibliotekanauki.pl/articles/895395.pdf
    Data publikacji:
    2018-08-31
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    FTIR
    XRD
    DSC
    quality by design
    domperidone maleate
    drug release kinetics
    Opis:
    The aim of study was to evaluate the release kinetics of domperidone maleate (DM) from immediate release (IR) tablets prepared by wet granulation method. Box behnken design (BBD) was used to optimize and evaluate the main, interaction and quadratic effects of independent variables i.e. crosslinked carboxymethyl cellulose (CMC) (X1), sodium starch glycolate (SSG) (X2) and starch (X3) on responses R2 of first order (YI) and β value of weibull model (Y2). Prepared tablets were characterized by various physical tests, in-vitro drug release, fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). Accelerated stabilities studies were performed on optimized formulation D9. Y1 and Y2 were ranged from 0.9959 to 0.9994 and 0.041 to 0.912 respectively. β value of weibull model indicated the parabolic shape of dissolution curve. The quadratic model fit the data well and the resulting equations were used to predict the responses in the box behnken design. FTIR spectra showed the compatibility of DM with CMC and SSG. XRD presented diffraction lines indicates crystalline nature of drug. DSC thermograms indicated endothermic peak at 220 0C for DM. Stabilities studies revealed that no significant change in hardness, friability, disintegration time and dissolution release profile of DM. It is concluded that a combination of CMC and SSG can be used to enhance the dissolution and release kinetics of IR tablets of DM.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 4; 965-975
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zinc and graphene oxide composites as new protective coatings for oil and gas pipes
    Kompozyty cynku i tlenku grafenu jako nowe powłoki ochronne rur do przesyłu nafty i gazu
    Autorzy:
    Asghar, M. Sajid Ali
    Amir, Muhammad
    Hussain, Umer
    Sabri, Mohammed M.
    Powiązania:
    https://bibliotekanauki.pl/articles/24202808.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    corrosion resistance
    graphene oxide
    Hummers method
    nanocomposites
    electrophoretic deposition
    odporność na korozję
    tlenek grafenu
    metoda Hummersa
    nanokompozyty
    osadzanie elektroforetyczne
    Opis:
    A method was developed to obtain a durable coating consisting of zinc and graphene oxide (Zn-GO) in order to reduce the mechanical wear and tear rate of oil and gas pipelines made of steel. Graphene oxide was obtained from graphite by wet chemical oxidation (unmodified and modified Hummers’ method) using potassium permanganate and sulfuric acid. The process was carried out at various temperatures. The steel was covered with an ultrathin layer of Zn-GO using the electrophoretic deposition method. The GO particle size (< 90 nm) was confirmed by XRD and laser analysis. For GO particles obtained by the modified Hummers’ method, a significant correlation was observed in the scratch (R2 = 0.87) and the Vickers microhardness tests (R2 = 0.93), which indicates a lower wear rate of Zn-GO-coated steel.
    Opracowano metodę otrzymywania trwałej powłoki składającej się z cynku i tlenku grafenu (Zn-GO) w celu zmniejszenia zużycia mechanicznego rurociągów naftowo-gazowych wykonanych ze stali. Tlenek grafenu pozyskano z grafitu metodą mokrego utleniania chemicznego (niezmodyfikowana i zmodyfikowana metoda Hummersa) z użyciem nadmanganianu potasu i kwasu siarkowego. Proces prowadzono w różnej temperaturze. Stal powlekano ultra cienką warstwą Zn-GO techniką osadzania elektroforetycznego. Metodą XRD i analizą laserową potwierdzono wielkość cząstek GO (≤ 90 nm). Dla cząstek GO otrzymanych zmodyfikowaną metoda Hummersa zaobserwowano znaczącą korelację w teście zarysowania (R2 = 0.87) i mikrotwardości Vickersa (R2 = 0.93), co świadczy o mniejszym stopniu zużycia stali pokrytej powłoką Zn-GO.
    Źródło:
    Polimery; 2023, 68, 7-8; 378--385
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FORMULATION AND IN VITRO EVALUATION OF FLOATING TABLETS OF PSYLLIUM HUSK & TRAGACANTH USING SITAGLIPTIN PHOSPHATE AS A MODEL DRUG
    Autorzy:
    Ghumman, Shazia A.
    Andleeb, Sahrish
    Bashir, Sajid
    Muhammad, Sarfraz R.
    Badshah, Munair
    Khattak, Majeedullah
    Powiązania:
    https://bibliotekanauki.pl/articles/895403.pdf
    Data publikacji:
    2018-06-30
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    sustained release
    Release kinetics
    Tragacanth
    floating tablets
    Sitagliptin phosphate
    psyllium husk
    Opis:
    Abstract A novel floating controlled release drug delivery system of Sitagliptin phosphate was formulated in an effort to increase the gastric retention time of the dosage form and thereby increased drug bioavailability. The tablets were prepared by wet granulation method using Psyllium Husk and tragacanth gum as a release retarding polymers and sodium bicarbonate as a gas generating agent. All the designed nine batches of floating tablets were evaluated for physical characteristics viz. weight variation, thickness, content uniformity, hardness, floating capacity, swelling studies. All formulations had floating lag time of less than 1 min and constantly floated for 12 h except F1, F4 and F7 (that dissolved completely in 8 h or less than 8 h). In vitro drug release studies were carried out for 8 h and release mechanism was further evaluated by linear regression analysis, F9 composed of 30% Psyllium Husk, 10% tragacanth gum and 18% sodium bicarbonate sustained the drug release for longer period. The formulations followed first order kinetics, Higuchi drug release kinetics with diffusion as the dominant mechanism of drug release and the release exponent ranged (0.452-0.635) indicating that the drug release from all formulations was by non-Fickian diffusion mechanism. The prepared floating tablets of STP (F9) might be a promising drug delivery system with sustained release action and improved bioavailability.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 3
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of EASEWASTE model for assessing environmental impacts from solid waste landfilling
    Autorzy:
    Alam, Asifa
    Chaudhry, Muhammad Nawaz
    Ahmad, Sajid Rashid
    Batool, Aadila
    Mahmood, Adeel
    Al-Ghamdi, Huda Ahmad
    Powiązania:
    https://bibliotekanauki.pl/articles/2073793.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EASEWASTE
    risk assessment
    dumping sites
    gas emissions
    toxicity
    Opis:
    Dumping sites or landfills are considered as foremost common option of waste management worldwide. Dumping sites, often not lined, represent a potential environmental issue causing a long-term risk to the environment and health. A number of computers model-based studies have described the solid waste collection and its management, but provide little information about the relative contributions regarding environmental impacts of landfilling especially in the context of developing world. The aim of study was to estimate environmental impacts from dumping site by using EASEWASTE model. A case study was carried out at an old and closed dumping site filled with mixed waste without bottom liner, no leachate collection and gas collection. On the basis of the existing dumping site investigation, a Mahmood Booti Dumping Site Scenario was developed, and related data of waste generation & composition was collected and added to assess environmental impacts. The results show that human toxicity via soil (9.14E+09 m3 soil) had the highest potential impact, followed by global warming (8.83E+11 Kg CO2-eq), eco-toxicity in water (6.25E+11 m3 water), and eco-toxicity in soil (6.54E+10 m3 soil). This is mostly caused by leaching of heavy metals from ashes (e.g. residues from roads cleaning and vacuum cleaning bags), batteries, paper and metals. The adopted risk analysis approach uses easily accessible computer aided models, for open dumping sites, appears to be a key tool to assist decision makers in establishing priorities for remediation action.
    Źródło:
    Archives of Environmental Protection; 2021, 47, 4; 84--92
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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