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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:
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:
Systematic literature review: theory perspective in Lean Manufacturing performance
Autorzy:
Aripin, Norhana Mohd
Nawanir, Gusman
Mahmud, Fatimah
Fauzi, Muhammad Ashraf
Hussain, Suhaidah
Lee, Khai Loon
Powiązania:
https://bibliotekanauki.pl/articles/27315570.pdf
Data publikacji:
2023
Wydawca:
STE GROUP
Tematy:
Lean Manufacturing
performance
theory perspective
systematic literature review
Opis:
This review examines the trend of applying theories in LM performance and offers the latest recapitulation of related theories in LM performance. The methodology is based on Preferred Reporting Items for Systematic Reviews (PRISMA) to search for multiple scientific information databases and to guarantee that no important study is overlooked. For the single theory, highly employed theories were the Theory of Constraints, Resource-based View/Natural Resource-based View Theory (RBV/NRBV), and Contingency Theory (CT). Meanwhile, several employed integrations of several theories in a publication. Concerning the year of publication, significant growth in articles with underpinned theories was published articles from 2020 onwards. This study offers several significant contributions to researchers to widen the knowledge related to the adaptation of theories in the field of lean performance, as research underpinned by a theory offers a solid and convincing result in investigating the research problems. The first limitation was the search string to identify the related articles, which could be extended to maximize the article search. The other limitation was the database used which was limited to the Scopus database. Despite the importance of underpinning theory in research, OM has been criticized for the inadequacies of its theory, with only one-third of OM research incorporating theory. However, a limited review was conducted on the theories used in LM performance theory. To reduce this gap, this review examines the trend of applying theories in LM performance and offers the latest recapitulation of related theories in LM performance.
Źródło:
Management Systems in Production Engineering; 2023, 2 (31); Bibliogr. 96 poz., rys., tab.
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of silver nanoparticles by aqueous extract of Zingiber officinale and their antibacterial activities against selected species
Autorzy:
Hussain, Zawar
Jahangeer, Muhammad
ur Rahman, Shafiq
Ihsan, Tamanna
Sarwar, Abid
Ullah, Najeeb
Aziz, Tariq
Alharbi, Metab
Alshammari, Abdulrahman
Alasmari, Abdullah F.
Powiązania:
https://bibliotekanauki.pl/articles/27315653.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Nanotechnology
Antibacterial activity
Silver-nanoparticles
green synthesis
Ginger
Opis:
Silver nanoparticles have special plasmonic and antibacterial characteristics that make them efficient in a variety of commercial medical applications. According to recent research, chemically synthesized silver nanoparticles are harmful even in low concentrations. It was crucial to identify appropriate synthesis methods that may have low costs and be nontoxic to the environment. Zingiber officinale (ginger) extracts used to prepare silver nanoparticles were inexpensive and environmentally friendly, and the best physicochemical characteristics were analyzed. Silver nanoparticles were characterized by using UV-visible spectroscopy, Scanning electron microscopy (SEM), and X-ray diffraction (XRD). The surface Plasmon resonance peak at 425 nm was observed using UV-Visible spectroscopy. Scanning electron microscopy observed that the nanoparticles were spherical and ranged in size from 5 to 35 nm. The XRD pattern values of 2θ: 38.2° , 46.3° , and 64.58° are used to determine the planes (111), (200), and (220). The silver nanoparticle’s existence was verified by the face-centered cubic (FCC). Silver nanoparticles were found to have antibacterial efficacy against gram-positive Staphylococcus and gram-negative bacteria such as Pseudomonas aeruginosa, Klebsiella Aerogenes, Salmonella, Staphylococcus and Escherichia coli. The antibacterial activity of silver nanoparticles was observed using the agar well diffusion (AWD) method at three different concentrations (100 μg/ ml, 75 μg/ml, and 50 μg/ml). The zone of inhibition measured against the bacterial strains pseudomonas Aeruginosa, Klebsiella aerogenes, Escherichia coli, Salmonella and Staphylococcus which were (18.4±1.25 mm, 16.9±0.74 mm, 14.8±1.25 mm), (16.8±0.96 mm, 14.6±0.76 mm, 14.0±1.15 mm), (19.7±0.76 mm, 18.2±0.66 mm, 15.4±1.15 mm), (16.6±0.67 mm, 14.2±0.23 mm, 12.8±0.78 mm) and (12±0.68 mm, 10±0.20 mm, 08±0.15 mm). These nanoparticles’ potent antibacterial properties may enable them to be employed as nanomedicines for a variety of gramnegative bacterial illness treatments.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 3; 23--30
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Prioritizing and modelling of putative drug target proteins of Candida albicans by systems biology approach
Autorzy:
Ismail, Tariq
Fatima, Nighat
Muhammad, Syed
Zaidi, Syed
Rehman, Nisar
Hussain, Izhar
Tariq, Najam us
Amirzada, Imran
Mannan, Abdul
Powiązania:
https://bibliotekanauki.pl/articles/1038391.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Candida albicans
drug target identification
protein modeling
Opis:
Candida albicans (Candida albicans) is one of the major sources of nosocomial infections in humans which may prove fatal in 30% of cases. The hospital acquired infection is very difficult to treat affectively due to the presence of drug resistant pathogenic strains, therefore there is a need to find alternative drug targets to cure this infection. In silico and computational level frame work was used to prioritize and establish antifungal drug targets of Candida albicans. The identification of putative drug targets was based on acquiring 5090 completely annotated genes of Candida albicans from available databases which were categorized into essential and non-essential genes. The result indicated that 9% of proteins were essential and could become potential candidates for intervention which might result in pathogen eradication. We studied cluster of orthologs and the subtractive genomic analysis of these essential proteins against human genome was made as a reference to minimize the side effects. It was seen that 14% of Candida albicans proteins were evolutionary related to the human proteins while 86% are non-human homologs. In the next step of compatible drug target selections, the non-human homologs were sequentially compared to the human microbiome data to minimize the potential effects against gut flora which accumulated to 38% of the essential genome. The sub-cellular localization of these candidate proteins in fungal cellular systems indicated that 80% of them are cytoplasmic, 10% are mitochondrial and the remaining 10% are associated with the cell wall. The role of these non-human and non-gut flora putative target proteins in Candida albicans biological pathways was studied. Due to their integrated and critical role in Candida albicans replication cycle, four proteins were selected for molecular modeling. For drug designing and development, four high quality and reliable protein models with more than 70% sequence identity were constructed. These proteins are used for the docking studies of the known and new ligands (unpublished data). Our study will be an effective framework for drug target identifications of pathogenic microbial strains and development of new therapies against the infections they cause.
Źródło:
Acta Biochimica Polonica; 2018, 65, 2; 209-218
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phosphorous transformation as influenced by different levels of phosphorous alone and in combination with humic acid
Autorzy:
Jamal, Aftab
Hussain, Iqrar
Sarir, Muhammad Sarirullah
Fawad, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/1177484.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Humic acid
Incubation
SSP
phosphorous transformation
Opis:
An incubation experiment was carried out in completely randomized design (CRD) at the laboratory of soil and environmental sciences, the university of Agriculture Peshawar, Pakistan to investigate changes in AB-DTPA extractable soil Phosphorous (P) with the addition of Humic acid (HA) and added P levels as single super phosphate (SSP). Two levels of HA including control (H0: control and H1: 500 g ha-1) and four levels of P as single super phosphate (SSP) including control (P0: control, P1: 60 kg ha-1, P2: 90 kg ha-1, and P3: 150 kg hectare) were utilized. Soil treated with different levels of SSP alone or reinforced with HA showed an initial decline in AB-DTPA extractable P in first 14 days and then rapid mineralization up to 56 days of incubation in the laboratory. HA increased mean available P by 44.93, 16.08 and 7.25 % at 0, 60 and 90 kg P205 ha-1. Weekly turnover of P ranged from 0.19 to 0.43 mg P kg-1 soils for soils treated with different levels of SSP alone or reinforced with HA. HA increased weekly turnover by 40 and 8.82 % at 60 and 90 kg P205 ha-1 as SSP respectively. HA applied alone or reinforced with 60 and 90 kg P205 ha-1 increased mean available P, weekly turnover of P as well as mineralization potential.
Źródło:
World Scientific News; 2018, 102; 173-179
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of Relay-Assisted Device-to-Device Communication
Autorzy:
Hussain, Zakir
Mehdi, Haider
Saleem, Syed Muhammad Atif
Mahboob, Aashir
Powiązania:
https://bibliotekanauki.pl/articles/2134046.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CCI signals
D2D communication
k-m shadowed fading
kappa-my shadowed fading
outage probability
relay
Opis:
Outage and Success performances of an amplify-and-forward relay-assisted D2D communication system over a κ-μ shadowed fading wireless link are presented here. Co-channel interference (CCI) is assumed to affect the D2D signals at relay and destination nodes. The system is analyzed with two scenarios, namely, with diversity combining and without diversity combining. Selection combining (SC) based diversity scheme is incorporated at the D2D receiver to combat fading conditions. The expressions for success and outage probabilities are presented by using the characteristic function approach. The expressions are functions of path-loss exponents, wireless link length between relay and D2D source node, wireless link length between the receiver node and relay, distances between interferers and the relay node, CCI distances from various devices of the system, fading channel. The numerical analysis for various scenarios is presented and analyzed.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 587--593
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the compositional graded quaternary barrier AlGaN-based ultraviolet-C light-emitting diode
Autorzy:
Malik, S.
Usman, Muhammad
Hussain, M.
Munsif, M.
Khan, S.
Rasheed, S.
Ali, S.
Powiązania:
https://bibliotekanauki.pl/articles/1818198.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
ultraviolet
light-emitting diodes
efficiency
quantum wells
Opis:
The compositional graded quaternary barriers (GQBs) instead of ternary/conventional quantum barriers (QBs) have been used to numerically enhance the efficiency of AlGaN-based ultraviolet light-emitting diode (LED). The performance of LED with GQBs is examined through carrier concentrations, energy band diagrams, radiative recombination, electron and hole flux, internal quantum efficiency (IQE), and emission spectrum. As a function of the operating current density, a considerable reduction in efficiency droop is observed in the device with composition-graded quaternary barriers as compared to the conventional structure. The efficiency droop in case of a conventional LED is ~77% which decreased to ~33% in case of the proposed structure. Moreover, the concentration of electrons and holes across the active region in case of the proposed structure is increased to ~156% and ~44%, respectively
Źródło:
Opto-Electronics Review; 2021, 29, 3; 80--84
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the compositional graded quaternary barrier AlGaN-based ultraviolet-C light-emitting diode
Autorzy:
Malik, S.
Usman, Muhammad
Hussain, M.
Munsif, M.
Khan, S.
Rasheed, S.
Ali, S.
Powiązania:
https://bibliotekanauki.pl/articles/1818193.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
ultraviolet
light-emitting diodes
efficiency
quantum wells
Opis:
The compositional graded quaternary barriers (GQBs) instead of ternary/conventional quantum barriers (QBs) have been used to numerically enhance the efficiency of AlGaN-based ultraviolet light-emitting diode (LED). The performance of LED with GQBs is examined through carrier concentrations, energy band diagrams, radiative recombination, electron and hole flux, internal quantum efficiency (IQE), and emission spectrum. As a function of the operating current density, a considerable reduction in efficiency droop is observed in the device with composition-graded quaternary barriers as compared to the conventional structure. The efficiency droop in case of a conventional LED is ~77% which decreased to ~33% in case of the proposed structure. Moreover, the concentration of electrons and holes across the active region in case of the proposed structure is increased to ~156% and ~44%, respectively.
Źródło:
Opto-Electronics Review; 2021, 29, 3; 80--84
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Linear Impact of Textile and Clothing Manufacturing on Economic Growth: The Case of Top-Asian Economies
Nieliniowy wpływ produkcji tekstyliów i odzieży na wzrost gospodarczy: przypadek największych gospodarek azjatyckich
Autorzy:
Hussain, Hafezali Iqbal
Haseeb, Muhammad
Kot, Sebastian
Jermsittiparsert, Kittisak
Powiązania:
https://bibliotekanauki.pl/articles/234011.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
textile manufacturing
clothing manufacturing
economic growth
Asian economy
quantile
produkcja tekstyliów
produkcja odzieży
wzrost gospodarczy
gospodarka azjatycka
kwantyl
Opis:
The potential contribution of the textile sector is not limited to the local economy but it also represents a country’s image in the global market. It carries the initial boom for most emerging nations in their journey towards improved economic growth. The present study employs Quantile on Quantile regression, which is a unique methodology and has the tendency to establish the relationship between variables that are non-linear in nature across various quantile distributions. Moreover, the method stated helps in explaining the asymmetric response in the quantiles of economic growth of the countries studied caused by the quantiles of the textile and clothing industry. The quarterly data ranges from 1990 to 2018, and findings therefrom endorse the presence of a positive relationship between TTC and economic growth in all Asian Countries studied. In addition to this, the direction of the relationships in the quantiles was also evaluated by Granger causality, which revealed the presence of bidirectional causal effects in all countries, excluding Japan, Pakistan and Turkey, where it was found as uni-directional. Lastly, based on the findings, the government and policy making institutions are recommended for the introduction of certain programs thatwill incentivize and provide subsidies to potential investors, thus relaxing the competition for new entrants in the TTC sector.
Potencjalny wkład sektora tekstylnego nie ogranicza się do lokalnej gospodarki, ale reprezentuje również wizerunek kraju na rynku światowym. Niesie to początkowy rozkwit większości krajów wschodzących na ich drodze do lepszego wzrostu gospodarczego. W badaniu zastosowano metodę regresji kwantylowej, która jest unikalną metodologią i ma tendencję do ustalania relacji między zmiennymi o nieliniowym charakterze w różnych rozkładach kwantyli. Podana metoda pomaga ponadto w wyjaśnieniu asymetrycznej odpowiedzi w kwantylach wzrostu gospodarczego badanych krajów spowodowanej przez kwantyle przemysłu tekstylno-odzieżowego. Dane kwartalne obejmują okres 1990-2018, a ustalenia z tych lat potwierdzają istnienie pozytywnego związku między TTC a wzrostem gospodarczym we wszystkich badanych krajach azjatyckich. Oprócz tego, kierunek relacji w kwantylach został również oceniony przez przyczynowość Grangera, która ujawniła obecność dwukierunkowych efektów przyczynowych we wszystkich krajach, z wyjątkiem Japonii, Pakistanu i Turcji, gdzie stwierdzono je jako jednokierunkowe. Na podstawie ustaleń, zaleca się instytucjom rządowym i tworzącym politykę wprowadzenie pewnych programów, które będą motywować i zapewniać dotacje potencjalnym inwestorom, łagodząc w ten sposób konkurencję dla nowych podmiotów w sektorze TTC.
Źródło:
Fibres & Textiles in Eastern Europe; 2020, 5 (143); 27-36
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Fibre Orientation and Void Content in Bagasse Fibre Composites Using an Image Analysis Technique
Zastosowanie techniki analizy obrazu do badania orientacji włókien i zawartości pustych przestrzeni w kompozytach wzmocnionych włóknami bagasse
Autorzy:
Siddique, Sheraz Hussain
Faisal, Saira
Mohtashim, Qurat-ul-Ain
Ali, Muhammad
Gong, R. Hugh
Powiązania:
https://bibliotekanauki.pl/articles/1419413.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
composites
bagasse fibre
fibre orientation
void content
weight percentage
alkali treatment
kompozyty
włókno bagasse
orientacja włókien
zawartość wolnej przestrzeni
procent wagowy
obróbka alkaliczna
Opis:
In this research work, a nondestructive technique of image analysis was explored to determine the fibre orientation and void content in Bagasse fibre reinforced composites. Fibre length, alkali treatment and fibre loading were studied as variables. The fibre orientation was irrespective of the fibre length, fibre loading and alkali treatment variables. The void content and size decreased with increases in fibre length and alkali treatment. The alkali treatment resulted in the removal of lignin, making the surface of the fibres rough. It also led to making the fibre count fine i.e. reducing the diameter of the fibres and thus presenting more fibres for interaction with resin. Both these phenomena resulted in a slower flow of resin. The void content of bagasse fibre composites decreased with higher fibre loading because a higher number of fibres slows the resin flow. However, the size i.e. area of the voids increased with the fibre loading from 20 to 30%, probably due to increased wetting difficulty.
W pracy badawczej zbadano nieniszczącą technikę analizy obrazu w celu określenia orientacji włókien i zawartości pustych przestrzeni w kompozytach wzmocnionych włóknem bagasse. Jako zmienne zbadano długość włókien, obróbkę alkaliami i obciążenie włókien. Orientacja włókien była niezależna od długości włókna, obciążenia włókna i parametrów obróbki alkalicznej. Ilość i rozmiar pustych przestrzeni zmniejszały się wraz ze wzrostem długości włókna i obróbką alkaliczną. Obróbka alkaliczna spowodowała usunięcie ligniny, powodując szorstkość powierzchni włókien. Doprowadziło to również do dokładnego zliczenia włókien, tj. zmniejszenia średnicy włókien, a co za tym idzie większej liczby włókien w interakcji z żywicą. Oba te zjawiska spowodowały wolniejszy przepływ żywicy. Ilość pustych przestrzeni w kompozytach włókien bagasse zmniejszyła się wraz ze wzrostem obciążenia włókien, ponieważ większa liczba włókien spowalnia przepływ żywicy. Jednak rozmiar, tj. obszar pustych przestrzeni, wzrastał wraz z obciążeniem włókien od 20% do 30%, prawdopodobnie z powodu zwiększonej trudności zwilżania.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 3 (147); 26-32
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of safety climate on job performance and job satisfaction with moderating role of psychological capital
Autorzy:
Kiyani, Amir Saif Ali
Rizvi, Tahir Hussain
Khan, Muhammad Saqib
Powiązania:
https://bibliotekanauki.pl/articles/1375509.pdf
Data publikacji:
2019
Wydawca:
Międzynarodowy Instytut Innowacji Nauka – Edukacja – Rozwój w Warszawie
Tematy:
Safety climate
Job Satisfaction
Job Performance
psychological Capital
Conserva-tion of Resource Theory
Public Sector Organization Rawalpindi and Islamabad
Opis:
The current research investigated the effect of safety climate on job satisfaction and job performance with psychological capital as a moderator between safety climate and job satisfaction as well as job performance. This research fills the gap by collecting empirical evidence from the emerging organizations of Pakistan. Conservation of resource theory (COR) is relevant to the research area. Data were collected from 300 employees from different Organizations. The current study is empirical and quantitative-based study is used to conducted research. Data were collected by convenient non-probability sampling techniques to be used and collected from employees working in the reputed organization; Chemical, Cement, Petroleum, Oil and Gas industry of Islamabad and Rawalpindi. Confirmatory Factor analysis was done through AMOS and hypotheses were tested through SPSS regression analysis process of Hayes model. To test the moderation effects, the process of Hayes model 1 was also performed. Safety climate has a positive relationship with the two DVs which are job performance and job satisfaction. Moreover, Psychological Capital played a significant moderating role between safety climate and job satisfaction as well as job performance. When Psychological capital was high, the relationship between safety climate and job performance as well as the relationship between safety climate and job satisfaction were stronger. These results are important for future studies. This research recommended top management and responsible authorities to promote safety climate activates between their organization in order to enhance their employees satisfy and high performed. Moreover, this research strongly recommends psychological capital amongst organization looking for highly satisfied and effective employees. Further implications for practice were discussed in detail.
Źródło:
International Journal of New Economics and Social Sciences; 2019, 9(1); 363-379
2450-2146
2451-1064
Pojawia się w:
International Journal of New Economics and Social Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Image encryption based on Chebyshev chaotic map and S8 S-boxes
Autorzy:
Hussain, Iqtadar
Anees, Amir
Alkhaldi, Ali Hussain
Aslam, Muhammad
Siddiqui, Nasir
Ahmed, Rehan
Powiązania:
https://bibliotekanauki.pl/articles/173918.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
image encryption
chaos
noise-resistant
statistical analysis
key sensitivity
Opis:
The encryption of image data is artful as compare to others due to some special characteristics such as entropy, contrast, the correlation between the pixels, intensity, and homogeneity. During encryption process, it is conventionally not easy to manage these characteristics with non-chaotic cryptosystems. Therefore for the sake of strong encryption algorithms, in last decades many cryptographers have presented invulnerable schemes for image encryption based on the chaotic maps. This manuscript aims to propose a strong encryption scheme based on a symmetric group of permutation advanced encryption standard (AES) substitution boxes and modified Chebyshev map. Principally, the secret key depends upon the parameters of Chebyshev map to create confusion in the main image and is encrypted by the scheme made from the S8 AES S-boxes and chaotic map. By this procedure, one can obtain an encrypted image that is entirely twisted. The results of analyses showed that the presented image encryption is strong and invulnerable.
Źródło:
Optica Applicata; 2019, 49, 2; 317-330
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fourth industrial revolution: a way forward to attain better performance in the textile industry
Autorzy:
Ślusarczyk, Beata
Haseeb, Muhammad
Hussain, Hafezali Iqbal
Powiązania:
https://bibliotekanauki.pl/articles/1396505.pdf
Data publikacji:
2019
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
Industry 4.0
firm performance
cyber physical system
interoperability
smart product
smart city
Przemysł 4.0
wydajność firmy
system cyberfizyczny
interoperacyjność
inteligentny produkt
inteligentne miasto
Opis:
The textile industry is one of the fastest growing industries which expressively contributes to the economic growth of Malaysia. However, in recent years, the situation has changed and demonstrates a downward trend. The imports are growing faster compared to the exports, consequently resulting in a low contribution to the gross domestic product (GDP). To address the issue, this study aims to investigate the role of Industry 4.0 on the performance of firms engaged in the production and services of the Malaysian textile industry. To achieve the objective, this study adopted a cross-sectional research design. A survey was carried out to collect data from employees of textile firms. Results of the study found that Industry 4.0 positively contributed to the effectiveness of the production and services of the textile industry. Production and services have a positive role in the performance of textile firms. The current study provides an interesting insight into the future direction of research for studies on organisational performance, which can be extended to different manufacturing-based industries. In addition, it provides the rationale for the adoption and implementation of smart technologies in these industries. It has been found that cyber-physical systems (CPS), interoperability, a smart city and a smart product have a positive effect on production and services. Additionally, it is not possible without the effective implementation of technology. Thus, the current study provides valuable insights into the improvement of the textile industry’s performance.
Źródło:
Engineering Management in Production and Services; 2019, 11, 2; 52-69
2543-6597
2543-912X
Pojawia się w:
Engineering Management in Production and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
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