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Tytuł:
Composites based on polyvinyl alcohol, chitosan, and curcumin for wound healing applications
Autorzy:
Tahir, Muhammad
Vicini, Silvia
Sionkowska, Alina
Powiązania:
https://bibliotekanauki.pl/articles/27324034.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polyvinyl alcohol
chitosan
curcumin
polymer
blends
wound healing
chitozan
polimery
biomateriały
Opis:
Natural polymers, like chitosan, collagen, and alginate, offer promising solutions for wound healing. Derived from natural sources, they exhibit biocompatibility and bioactivity, promoting tissue regeneration. These polymers can form scaffolds or dressings that accelerate wound closure while reducing infection risks. Their inherent properties make them promising options in the quest for effective wound care materials. In this work, composites based on polyvinyl alcohol (PVA), chitosan (Chi), and curcumin (Cur) were prepared. PVA, a synthetic water-soluble polymer, finds extensive use in biomedical and wound-healing applications. It is approved by the U.S. FDA for cosmetic, medical, and wound healing products. Chi, a polysaccharide, is widely used in biomedicine and possesses antibacterial properties. Both PVA and chitosan are biocompatible and exhibit good filming characteristics. Curcumin (Cur) with antibacterial and antioxidant properties is being explored for regenerative medicine. PVA, chitosan, and curcumin were blended. The structure was studied by FTIR, microscopic observations were done with optical and scanning electron microscopes, and the mechanical properties were assessed. FTIR revealed component interactions, while microscopy showed a flat film surface. The polymeric blend (PVA/Chi/Cur) had a Young’s modulus of 1.49 GPa, tensile strength of 47.69 MPa, stress value of 8.39 N, and 35.34% elongation at break. These properties make the blend suitable for consideration in wound healing applications.
Źródło:
Engineering of Biomaterials; 2022, 25, 167; 10--16
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of COVID-19 and cancer data using new half-logistic generated family of distributions
Autorzy:
Khan, Sadaf
Tahir, Muhammad H.
Jamal, Farrukh
Powiązania:
https://bibliotekanauki.pl/articles/29127967.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
half-logistic distribution
generalized family
likelihood estimation
bio-medical data
Frechet distribution
Opis:
We focus on a specific sub-model of the proposed family that we call the new half logistic-Fréchet. This sub-model stems from a new generalisation of the half-logistic distribution which we call the new half-logistic-G. The novelty of proposing this new family is that it does not include any additional parameters and instead relies on the baseline parameter. Standard statistical formulas are used to show the forms of the density and failure rate functions, ordinary and incomplete moments with generating functions, and random variate generation. The maximum likelihood estimation procedure is used to estimate the set of parameters. We conduct a simulation analysis to ensure that our calculations are converging with lower mean square error and biases. We use three real-life data sets to equate our model to well-established existing models. The proposed model outperforms the well-established four parameters beta Fréchet and exponentiated generalized Fréchet for some real- -life results, with three parameters such as half-logistic Fréchet, exponentiated Fréchet, Zografos–Balakrishnan gamma Fréchet, Topp–Leonne Fréchet, and Marshall–Olkin Fréchet and two-parameter classical Fréchet distribution.
Źródło:
Operations Research and Decisions; 2023, 33, 4; 71--95
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Gamma Kumaraswamy-G family of distributions: theory, inference and applications
Autorzy:
Arshad, Rana Muhammad Imran
Tahir, Muhammad Hussain
Chesneau, Christophe
Jamal, Farrukh
Powiązania:
https://bibliotekanauki.pl/articles/1059046.pdf
Data publikacji:
2020-12-04
Wydawca:
Główny Urząd Statystyczny
Tematy:
stochastic ordering
Opis:
In this paper, we introduce a new family of univariate continuous distributions called the Gamma Kumaraswamy-generated family of distributions. Most of its properties are studied in detail, including skewness, kurtosis, analytical comportments of the main functions, moments, stochastic ordering and order statistics. The next part of the paper focuses on a particular member of the family with four parameters, called the gamma Kumaraswamy exponential distribution. Among its advantages, the following should be mentioned: the corresponding probability density function can have symmetrical, left-skewed, right-skewed and reversed-J shapes, while the corresponding hazard rate function can have (nearly) constant, increasing, decreasing, upside-down bathtub, and bathtub shapes. Subsequently, the inference on the gamma Kumaraswamy exponential model is performed. The method of maximum likelihood is applied to estimate the model parameters. In order to demonstrate the importance of the new model, analyses on two practical data sets were carried out. The results proved more favourable for the studied model than for any of the other eight competitive models.
Źródło:
Statistics in Transition new series; 2020, 21, 5; 17-40
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Advertising Appeals on Purchase Intention for Women’s Fashion Products in Malaysia
Autorzy:
Farihah Bt. Isamudin, Nur
Tahir Jan, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2054345.pdf
Data publikacji:
2021-07-02
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
Advertising appeals
fashion products
purchase intention
Malaysia
Opis:
This paper is mainly focused on analyzing the impact of four advertising appeals, namely love appeal, humor appeal, happiness appeal and excitement appeal on purchase intention for women fashion products in Malaysia. Primary data were collected from 303 respondents using selfadministered online questionnaire that was distributed among social media users in Malaysia. The collected data went through an extensive process of screening and sorting to prepare for the analyses. Several important tests were conducted using analytical tools, namely IBM Statistical Package for the Social Sciences (SPSS) and its added module, AMOS to reach the fi ndings. Among them are a descriptive analysis, reliability tests, an exploratory and confi rmatory factor analysis, and hypothesis testing. In addition, two-stage structural equation modeling (SEM) was used to test for the fi tness of the proposed model. The fi ndings from the study revealed that two out of four advertising appeals, namely excitement appeal and love appeal, had signifi cant positive impacts on consumers’ purchase intention. Meanwhile, humor appeal and happiness appeal were found to have insignifi cant impacts. This research provides invaluable insights for marketers, especially those in women’s fashion industry in Malaysia, in creating eff ective advertising campaign to promote their fashion products to consumers in Malaysia. A unique attempt to investigate the individual impact of love appeal, humor appeal, happiness appeal, and excitement appeal on purchase intention is the strength of this research. Further, this study is also invaluable because of its main consideration, which was women’s fashion products.
Źródło:
Journal of Marketing and Consumer Behaviour in Emerging Markets; 2021, 1(12); 19-36
2449-6634
Pojawia się w:
Journal of Marketing and Consumer Behaviour in Emerging Markets
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Review on Adsorption of Heavy Metals from Wood-Industrial Wastewater by Oil Palm Waste
Autorzy:
Ayob, Syafiqa
Othman, Norzila
Altowayti, Wahid Ali Hamood
Khalid, Faisal Sheikh
Bakar, Norshila Abu
Tahir, Muhammad
Soedjono, Eddy Setiadi
Powiązania:
https://bibliotekanauki.pl/articles/1839174.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
industrial wastewater
heavy metal
adsorption
activated carbon
oil palm waste
Opis:
The use of heavy metals in the manufacturing industry over the past few decades has eventually contributed to a rise in the flow of metallic compounds into wastewater and has raised significant ecological and health threats to living things. Adsorption is an excellent way to treat solid waste effluent, offering significant benefits such as affordability, profitability, ease of operation and efficiency. However, the price of commercial adsorbent namely activated carbon has soared due to its high demand. There is also a green improvement in this method by turning the commercial adsorbent into agricultural waste. In Malaysia, the oil palm waste is such suitable material that can be utilized for making activated carbon, since they are ample and easy to find. Additionally, part of them is agricultural waste that cannot be consumed (i.e. leaves and fronds). Hence, this study aimed to analyse the potential of activated carbon from agricultural waste, namely oil palm waste, in reducing the levels of heavy metals in industrial wastewater.
Źródło:
Journal of Ecological Engineering; 2021, 22, 3; 249-265
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is Your Purchase Intention Influenced by Irrational Factors? An Investigation of Fashion Industry
Autorzy:
Tahir Jan, Muhammad
Mohamed Hamed Aly Abouzaid, Ahmed
Nadeem, -
Hossain, Tashpia
Powiązania:
https://bibliotekanauki.pl/articles/2054871.pdf
Data publikacji:
2020-12-08
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
Irrational factors
purchase intention
fashion industry
SEM
Opis:
This research paper mainly aims to identify and analyse irrational factors that impact consumers’ purchase intention, especially in the fashion industry. The data for this study were collected from 205 consumers of various nationalities via an online self-administered questionnaire. The acquired data were put through a thorough process to establish their relevance and to ensure that the data were ready for further analysis by applying the SPSS & AMOS software. Three irrational factors were extracted from the extant literature, namely, media, social impact, and emotions. These factors are reported to have a positive infl uence on the consumer’s purchase intention. First, a descriptive analysis was undertaken followed by an inferential analysis. Structural equation modelling (SEM) was used to test the fi tness of the proposed model and also to test the hypotheses. Two out of the total three hypotheses are supported. In this case, media infl uence and social infl uence emerged with a signifi cant positive impact on the consumer’s purchase intention. Even though emotions infl uence resulted in a positive impact, it was not statistically signifi cant and does not relate to the consumer’s purchase intention in the fashion industry. The fi ndings of this study have signifi cant contribution to the body of knowledge and practice. Marketing research, in general, and consumer research, in particular, will benefi t from the contribution of this research. Similarly, policy makers in the fashion industry may adopt the fi ndings of the present study to devise more eff ective marketing strategies. Indeed, this research highlights that the consumer’s purchase intention is not entirely in response to a particular phenomenon but a multitude of so-called “irrational” factors like media, society, and emotions.
Źródło:
Journal of Marketing and Consumer Behaviour in Emerging Markets; 2020, 2(11); 16-32
2449-6634
Pojawia się w:
Journal of Marketing and Consumer Behaviour in Emerging Markets
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review on Mechanical Properties of Metakaolin Geopolymer Concrete by Inclusion of Steel Fibers
Autorzy:
Faris, Meor Ahmad
Mohd Mustafa Al Bakri, Abdullayh
Muniandy, Ratnasamy
Ramasamy, Shamala
Abu Hashim, Mohammad Firdaus
Junaedi, Subaer
Sandu, Andrei Victor
Mohd Tahir, Muhammad Faheem
Powiązania:
https://bibliotekanauki.pl/articles/2048744.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
geopolymer
metakaolin
fiber reinforced concrete
steel fiber
mechanical properties
Opis:
This study summarised the recent achievement in developing fiber reinforced geopolymer concrete. The factor of replacing Ordinary Portland Cement (OPC) which is due to the emission of carbon dioxide that pollutes the environment globally is well discussed. The introduction towards metakaolin is presented. Besides, the current research trend involved in geopolymer also has been reviewed for the current 20 years to study the interest of researchers over the world by year. Factors that contribute to the frequency of geopolymer research are carried out which are cost, design, and the practicality of the application for geopolymer concrete. Besides, the importance of steel fibers addition to the geopolymer concrete is also well discussed. The fundamental towards metakaolin has been introduced including the source of raw material, which is calcined kaolin, calcined temperature, chemical composition, geopolymerisation process, and other properties. Alkali activators which are mixing solution between sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) have been reviewed. The mechanical properties of fibers reinforced metakaolin-based geopolymer concrete which is compressive and flexural are thoroughly reviewed. The compressive and flexural strength of fiber-reinforced metakaolin geopolymer concrete shows some improvement to the addition of steel fibers. The reviews in this field demonstrate that reinforcement of metakaolin geopolymer concrete by steel fibers shows improvement in mechanical performance.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 261-267
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation of chopped steel wool fiber at various ratio reinforced cementitious composite panels
Autorzy:
Rmdan Amer, Akrm A.
Al Bakri Abdullah, Mohd Mustafa
Ming, Liew Yun
Aziz, Ikmal Hakem A.
Mohd Tahir, Muhammad Faheem
Abd Rahim, Shayfull Zamree
Amer, Hetham A. R.
Powiązania:
https://bibliotekanauki.pl/articles/1852332.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
włókno stalowe
włókno posiekane
wełna stalowa
kompozyt cementowy
płyta kompozytowa
nośność
steel fiber
chopped fiber
steel wool
cementitious composite
composite panel
load carrying capacity
Opis:
The flexural toughness of chopped steel wool fiber reinforced cementitious composite panels was investigated. Reinforced cementitious composite panels were produced by mixing of chopped steel wool fiber with a ratio range between 0.5% to 6.0% and 0.5% as a step increment of the total mixture weight, where the cement to sand ratio was 1:1.5 with water to cement ratio of 0.45. The generated reinforced cementitious panels were tested at 28 days in terms of load-carrying capacity, deflection capacities, post-yielding effects, and flexural toughness. The inclusion of chopped steel wool fiber until 4.5% resulted in gradually increasing load-carrying capacity and deflection capacities while, provides various ductility, which would simultaneously the varying of deflection capability in the post-yielding stage. Meanwhile, additional fiber beyond 4.5% resulted in decreased maximum load-carrying capacity and increase stiffness at the expense of ductility. Lastly, the inclusion of curves gradually.
Źródło:
Archives of Civil Engineering; 2021, 67, 3; 661-671
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real-Time Vocal Tract Model for Elongation of Segment Lengths in a Waveguide Model
Autorzy:
Qureshi, Tahir Mushtaq
Ishaq, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/176990.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
digital waveguide
vocal tract
elongation of cylindrical segment
Opis:
A vocal tract model based on a digital waveguide is presented in which the vocal tract has been decomposed into uniform cylindrical segments of variable lengths. We present a model for the real-time numerical solution of the digital waveguide equations in a uniform tube with the temporally varying cross section. In the current work, the uniform cylindrical segments of the vocal tract may have their different lengths, the time taken by the sound wave to propagate through a cylindrical segment in an axial direction may not be an integer multiple of each other. In such a case, the delay in an axial direction is necessarily a fractional delay. For the approximation of fractional-delay filters, Lagrange interpolation is used in the current model. Variable length of the individual segment of the vocal tract enables the model to produce realistic results. These results are validated with accurate benchmark model. The proposed model has been devised to elongate or shorten any arbitrary cylindrical segment by a suitable scaling factor. This model has a single algorithm and there is no need to make section of segments for elongation or shortening of the intermediate segments. The proposed model is about 23% more efficient than the previous model.
Źródło:
Archives of Acoustics; 2019, 44, 2; 287-300
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Investigation of Self-Compacting Concrete Containing Coir Fibres
Autorzy:
Lakhiar, Muhammad Tarque
Lakhiar, Muhammad Tahir
Abdullah, Abd Halid
Mohamad, Noridah
Powiązania:
https://bibliotekanauki.pl/articles/2051698.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
self-compacting concrete
coir fibre
flow
compressive strength
split tensile strength
beton samozagęszczalny
włókno kokosowe
przepływ
wytrzymałość na ściskanie
wytrzymałość na rozciąganie
Opis:
Many researchers have investigated alternative sources to overcome the problem of conventional building material polluting the environment by the development of green self-compacting concrete in the construction industry. The best alternative solution is to utilise non-conventional construction materials like agricultural wastes. Meanwhile, self-compacting concrete (SCC) is considered as high strength as well as high-performance concrete. The demerits, which include tensile and flexural strength, can be improved by incorporating coir fibres. The utilisation of coir fibres also modifies self-compacting concrete performance after cracking and improves the toughness. This study defines an experimental investigation of the mechanical properties of self-compacting concrete containing coir fibres (CF) with different percentages being 0%, 0.2%, 0.5%, 1%, and 1.5% at 7- and 28-days water curing. The mechanical properties include the slump flow and compressive and tensile strength were examined. The outcomes demonstrated that a required slump flow for self-compacting concrete was achieved using coir fibres up to 1%, beyond which it reduced the slump significantly. The length of fibre and proportion of fibres directly affected the workability. The compressive strength was 10% to 15% enhanced with the incorporation of coir fibres up to 0.5%; after that, the strength was slightly reduced, and tensile strength was 30% to 50% improved compared to conventional self-compacting concrete up to 1% of coir fibres incorporation in the SCC mix, after which it rapidly reduced.
Źródło:
Civil and Environmental Engineering Reports; 2021, 31, 2; 163-177
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 16

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