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Tytuł:
Identification of potential groundwater recharge sites in a semi-arid region of Pakistan using Saaty’s Analytical Hierarchical Process (AHP)
Autorzy:
Suliman, Muhammad
Samiullah, Khan
Ali, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2055773.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Saaty’s Analytical Hierarchical Process (AHP)
weighted overlay analysis
semi-arid region
groundwater potential sites
GIS and remote sensing
Opis:
Groundwater is a precious source of fresh water and a major component of the entire water supply. Both water quality and quantity could be satisfied by evaluating the groundwater potential sites (GWPS). This paper analyzes the ground-water potentials in a semi-arid region of Khyber Pakhtunkhwa, Pakistan. It describes a standard methodology to identify and map GWPS using integrated Geographical Information System (GIS) and remote sensing (RS) methods. Eight parameters including elevation, slope, drainage density, lineaments density, soil, geology, land use/land cover and rainfall were integrated to explore areas with groundwater holding capability. GWPS were delineated through subjective weights assigned after coupling various thematic layers using Saaty’s Analytical Hierarchical Process (AHP). The modelled GWPS were cross-checked with tube wells data. The result indicates that the central part of the study area has good potential for groundwater reserves/exploitation, where the factors i.e. moderate to high drainage density, sedimentary sequence of alluvial plain, low elevation etc. discern the central portion of the study area as a suitable site for groundwater. This study suggests that the applied method proves to be very significant and reliable tool for timely assessment of quality assured evaluation of groundwater resources. This study could be a systematic guide for future investigations for water related explorations, especially in semi-arid environments.
Źródło:
Geomatics and Environmental Engineering; 2022, 16, 1; 53--70
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The power of ADKAR change model in innovative technology acceptance under the moderating effect of culture and open innovation
Autorzy:
Ali, Muhammad Ahmad
Zafar, Usman
Mahmood, Asif
Nazim, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2021479.pdf
Data publikacji:
2021
Wydawca:
Wyższa Szkoła Logistyki
Tematy:
ADKAR change model
reinforcement
uncertainty avoidance
perceived ease of use
inbound and outbound open innovation
perceived usefulness
model ADKAR
wzmocnienie
unikanie niepewności
łatwość użytkowania
Opis:
Background: Continuous change is a vital factor for organization’s sustainable growth and success. The implementation of modern information technology in business has become a core need of the hour. This study endeavours to answer how to cope with resistance to change when implementing new technology in the banking sector. A theoretical model has been developed with the blend of ADKAR change model, Technology Acceptance Model (TAM), and Hofstede dimensions of national culture to investigate the impact of the ADKAR change model on Technology Acceptance under the moderation of two national culture’s dimensions. Materials and Methods: In order to collect data, 500 self-administered questionnaires were dropped personally in five major banks of five cities of Pakistan using the convenience-based employee intercept sampling technique. The validated response rate was 68% by having 340 fit questionnaires for analysis using covariance-based structure equation modelling with the help of SmartPLS. Results: The results uncover the significant existence of covariance between dimensions of the ADKAR change model and technology acceptance model. The findings are statistically significant, inferring the influential role of change management on technology adoption. Conclusion: The study results provide promising implications based on these conclusions and findings for both theoretical aspects of these different models and practitioners.
Źródło:
LogForum; 2021, 17, 4; 485--502
1734-459X
Pojawia się w:
LogForum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep Neural Network for Supervised Single-Channel Speech Enhancement
Autorzy:
Saleem, Nasir
Irfan Khattak, Muhammad
Ali, Muhammad Yousaf
Shafi, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/177497.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
deep neural network
intelligibility
speech enhancement
speech quality
supervised learning
Wiener filtering
Opis:
Speech enhancement is fundamental for various real time speech applications and it is a challenging task in the case of a single channel because practically only one data channel is available. We have proposed a supervised single channel speech enhancement algorithm in this paper based on a deep neural network (DNN) and less aggressive Wiener filtering as additional DNN layer. During the training stage the network learns and predicts the magnitude spectrums of the clean and noise signals from input noisy speech acoustic features. Relative spectral transform-perceptual linear prediction (RASTA-PLP) is used in the proposed method to extract the acoustic features at the frame level. Autoregressive moving average (ARMA) filter is applied to smooth the temporal curves of extracted features. The trained network predicts the coefficients to construct a ratio mask based on mean square error (MSE) objective cost function. The less aggressive Wiener filter is placed as an additional layer on the top of a DNN to produce an enhanced magnitude spectrum. Finally, the noisy speech phase is used to reconstruct the enhanced speech. The experimental results demonstrate that the proposed DNN framework with less aggressive Wiener filtering outperforms the competing speech enhancement methods in terms of the speech quality and intelligibility.
Źródło:
Archives of Acoustics; 2019, 44, 1; 3-12
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does managerial coaching effect subordinates’ feedback orientation? Mediating role of affective supervisory commitment
Czy coaching kierowniczy wpływa na orientację opinii podległych pracowników? Mediacyjna i emocjonalna rola nadzoru
Autorzy:
Ali, Muhammad
Arbi, Khalil Ahmed
Raza, Basharat
Malik, Sania Zahra
Sheikh, Labiba
Powiązania:
https://bibliotekanauki.pl/articles/2021573.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska
Tematy:
managerial coaching
affective supervisory commitment
subordinate feedback orientation
social exchange
coaching menedżerski
emocjonalne zaangażowanie w nadzór
orientacja na informacje zwrotne podwładnych
wymiana informacji
Opis:
Managerial coaching has become a widely used human resource development strategy to improve various employee outcomes within organizations. However, existing literature lacks empirical evidence regarding the effectiveness of managerial coaching and less known about how managerial coaching influences subordinate feedback orientation through the mediating effect of employees’ commitment to the supervisor. This study uses a structured questionnaire to gather data from a cross-sectional sample of 257 employees working in the banking sector of Lahore, Pakistan, with a response rate of approximately 57%. Structural Equation Modeling (SEM) is used to test the proposed hypotheses. The results reveal that managerial coaching has a positive and direct significant impact on the subordinate feedback orientation and affective supervisory commitment. Affective supervisory commitment has a positive and direct significant relationship with the subordinate feedback orientation. Affective supervisory commitment also mediates the indirect relationship between managerial coaching and subordinate feedback orientation. This research also provides implications for managers and leaders, specifically looking to improve various employee outcomes through managerial coaching in the workplace.
Coaching menedżerski stał się szeroko stosowaną strategią rozwoju zasobów ludzkich w celu poprawy wyników różnych pracowników w organizacjach. Jednak w istniejącej literaturze brakuje dowodów empirycznych dotyczących skuteczności coachingu menedżerskiego i mniej wiadomo na temat tego, jak coaching menedżerski wpływa na orientację zwrotną podwładnych poprzez mediacyjny efekt zaangażowania pracowników wobec przełożonego. W badaniu tym zastosowano ustrukturyzowany kwestionariusz w celu zebrania danych z przekrojowej próby 257 pracowników zatrudnionych w sektorze bankowym w Lahore w Pakistanie, przy wskaźniku odpowiedzi wynoszącym około 57%. Modelowanie równań strukturalnych (SEM) służy do testowania proponowanych hipotez. Wyniki pokazują, że coaching menedżerski ma pozytywny i bezpośredni znaczący wpływ na orientację zwrotną podwładnych i afektywne zaangażowanie przełożonych. Zaangażowanie w nadzór afektywny ma pozytywny i bezpośredni znaczący związek z podporządkowaną orientacją na informację zwrotną. Zaangażowanie w nadzór afektywny pośredniczy również w pośrednim związku między coachingiem menedżerskim a orientacją zwrotną podwładnych. Badania te dostarczają również implikacji dla menedżerów i liderów, w szczególności chcących poprawić wyniki różnych pracowników poprzez coaching menedżerski w miejscu pracy.
Źródło:
Polish Journal of Management Studies; 2020, 22, 2; 9-21
2081-7452
Pojawia się w:
Polish Journal of Management Studies
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:
Climate change necessitates a change in the cultivation date of caraway (Carum carvi L.)
Autorzy:
Ibrahim, Mostafa Fathi
Ali, Muhammad Moaaz
Lamlom, Sobhi F.
Kalaji, Hazem M.
Yousef, Ahmed F.
Powiązania:
https://bibliotekanauki.pl/articles/2174359.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
climate change
condiment
leafy vegetable
sowing time
vegetative growth
volatile oil
Opis:
By 2050, global crop demand is projected to rise by 60-110%. Crop yields have also been impacted by cli mate change in some nations, and these impacts are likely to continue. To prevent the influence of climate change on crop output, it is critical to adjust planting times in weather-related open fields to meet food security concerns. Present study was carried out at Experimental Farm of Faculty of Agriculture, Al-Azhar University, Assiut, Egypt, during two successive seasons, 2019 and 2020. It was aimed to study the effect of different sowing times (1st and 15th October, 1st and 15th November), and plant spacings (25, 20, and 15 cm) on growth, fruit yield, and oil production of caraway (Carum carvi L.) plants. The results showed that sowing caraway plants on 15th October with plant spacing of 25 cm gave the highest dry weight (72.6 g∙plant-1), fresh weight (266.15 g∙plant-1), seed yield (37.43 g∙plant-1), and oil yield (0.659 cm 3∙plant-1). The maximum umbels (50.83 number per plant) and essential oil (1.78%) were also recorded in the plants receiving same treatment. On the other hand, plants sown at 15th November with spacing of 15 cm exhibited the minimum values of recorded traits. While the highest value of plant height gave with sowing caraway plants on 15th October with plant spacing of 15 cm (135.35 cm). In conclusion, the plants sowed on October 15th with a maximum plant spacing of 25 cm had the highest values of the evaluated morphological, biochemical, and yield attributes of caraway.
Źródło:
Journal of Water and Land Development; 2022, 54; 38--47
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EVENT-RELATED POTENTIALS REVEAL IMPAIRED EMOTION-COGNITION INTERACTION IN INDIVIDUALS WITH PUBLIC SPEAKING ANXIETY
Autorzy:
Feroz, Farah Shahnaz
Mat Ali, Muhammad Hairulnizam
Ismail, Afiq Idzudden
Salman, Ahmad Rifhan
Shahbodin, Faaizah
Powiązania:
https://bibliotekanauki.pl/articles/2138099.pdf
Data publikacji:
2021-11-12
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
public speaking anxiety
Flanker
emotion
cognition
P200
N200
emotiv
EEG
Opis:
This study used reaction time (RT) and event-related potential (ERP) analysis in an emotion-cognition Eriksen-Flanker (ECEF) task to investigate behavioral and neural abnormalities in individuals with public speaking anxiety (PSA). Although 25 per cent of people worldwide suffer from PSA, there is currently a lack of standardized assessment or biomarkers to detect emotion-cognition abnormalities in individuals with PSA. RT and ERP were compared between 12 subjects with high (H) PSA and 12 subjects with low (L) PSA in the ECEF experiment. EEG was recorded with the 14-channel Emotiv EPOC+. RT data showed a significant Flanker Effect across groups in the neutral and emotional (PSA-related) conditions, with increased Flanker effect in the HPSA group. On average, LPSA subjects were faster than the HPSA subjects in the ECEF task. HPSA subjects showed aberrant ERP responses in two ways. Firstly in the reversed N200 conflict effect with increased frontocentral amplitude in the incongruent compared to the congruent condition. Secondly, in the absence of the P200 frontocentral emotional modulation found in LPSA subjects. In the HPSA group, decreased P200 amplitude is significantly related to impaired behavioral performance in the neutral congruent condition. RT and ERP are useful in modern medicine because they successfully unveiled the biomarkers of abnormalities during the interaction of emotion and cognition. Impaired conflict processing in PSA-related condi- tions was found at the N200 and P200 windows in HPSA individuals.
Źródło:
Acta Neuropsychologica; 2021, 19(4); 427-443
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallelizing user-defined functions in the ETL workflow using orchestration style sheets
Autorzy:
Ali, Syed Muhammad Fawad
Mey, Johannes
Thiele, Maik
Powiązania:
https://bibliotekanauki.pl/articles/331096.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ETL workflow
parallel ETL operator
parallel algorithmic skeleton
user defined function
workflow ETL
równoległy szkielet algorytmiczny
funkcja zdefiniowana przez użytkownika
Opis:
Today’s ETL tools provide capabilities to develop custom code as user-defined functions (UDFs) to extend the expressiveness of the standard ETL operators. However, while this allows us to easily add new functionalities, it also comes with the risk that the custom code is not intended to be optimized, e.g., by parallelism, and for this reason, it performs poorly for data-intensive ETL workflows. In this paper we present a novel framework, which allows the ETL developer to choose a design pattern in order to write parallelizable code and generates a configuration for the UDFs to be executed in a distributed environment. This enables ETL developers with minimum expertise in distributed and parallel computing to develop UDFs without taking care of parallelization configurations and complexities. We perform experiments on large-scale datasets based on TPC-DS and BigBench. The results show that our approach significantly reduces the effort of ETL developers and at the same time generates efficient parallel configurations to support complex and data-intensive ETL tasks.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2019, 29, 1; 69-79
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equilibrium, kinetics and thermodynamic study of the adsorptive removal of methylene blue from industrial wastewater by white cedar sawdust
Autorzy:
Gardazi, Syed Mubashar H.
Shah, Jehanzeb Ali
Ashfaq, Tayyab
Sherazi, Tauqir A.
Ali, Muhammad Arif
Pervez, Arshid
Rashid, Naim
Iqbal, Javed
Amin, Bilal Ahmad Zafar
Bilal, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/207373.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
methylene blue
industrial wastewater
white cedar sawdust
WCS
dye adsorption
błękit metylenowy
ścieki przemysłowe
trociny białego cedru
adsorpcja barwników
Opis:
The study evaluated the adsorption potential of white cedar sawdust (WCS) for dye removal. WCS was chosen from five preferred, abundant waste biomasses from Pakistan. Various parameters such as contact time, adsorbent dose, dye concentration, pH, and particle size were optimized for methylene blue (MB) dye adsorption. The adsorbent was characterized by FTIR, SEM, EDX and BET analyses. The surface area of the adsorbent was 1.43 m2·g-1 and pore volume was 0.000687 cm3·g-1. The adsorption data best fitted the isotherm models of Langmuir, Temkin, Dubinin–Radushkevich, and Freundlich. The maximum experimental adsorption capacity obtained was 55.15 mg·g-1, which was in close agreement to the calculated adsorption capacity. Fitness of the pseudo-second order kinetics suggested chemisorption as the rate-limiting step. Thermodynamic study for adsorption was carried out to evaluate the Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°). The negative values ΔG° at the examined temperature range confirmed the spontaneous adsorption of MB onto WCS.
Źródło:
Environment Protection Engineering; 2019, 45, 3; 5-22
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration Based Gear Fault Diagnosis under Empirical Mode Decomposition and Power Spectrum Density Analysis
Autorzy:
Akram, M. Ammar
Khushnood, Shahab
Tariq, Syeda Laraib
Ali, Hafiz Muhammad
Nizam, Luqman Ahmad
Powiązania:
https://bibliotekanauki.pl/articles/102795.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
spur gears
tooth breakage
vibration amplitude
empirical mode decomposition
power spectrum density
time waveform
koła zębate czołowe
pękanie zęba
amplituda drgań
rozkład w trybie empirycznym
gęstość widmowa mocy
przebieg czasowy
Opis:
Rotating machinery plays a significant role in industrial applications and covers a wide range of mechanical equipment. A vibration analysis using signal processing techniques is generally conducted for condition monitoring of rotary machinery and engineering structures in order to prevent failure, reduce maintenance cost and to enhance the reliability of the system. Empirical mode decomposition (EMD) is amongst the most substantial non-linear and non-stationary signal processing techniques and it has been widely utilized for fault detection in rotary machinery. This paper presents the EMD, time waveform and power spectrum density (PSD) analysis for localized spur gear fault detection. Initially, the test model was developed for the vibration analysis of single tooth breakage of spur gear at different RPMs and then specific fault was introduced in driven gear under different damage conditions. The data, recorded by means of a wireless tri-axial accelerometer, was then analyzed using EMD and PSD techniques and the results were plotted. The results depicted that EMD algorithms are found to be more functional than the ordinarily used PSD and time waveform techniques.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 3; 192-200
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On inclusion relationships of certain subclasses of meromorphic functions involving integral operator
Autorzy:
Muhammad, Ali
Powiązania:
https://bibliotekanauki.pl/articles/747194.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Meromorphic functions
functions with bounded boundary and bounded radius rotation
quasi-convex functions
close-to-convex functions
generalized hypergeometric functions
functions with positive real part
Hadamard product (or convolution)
Opis:
In this paper, we introduce some subclasses of meromorphic functions in the punctured unit disc. Several inclusion relationships and some other interesting properties of these classes are discussed.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2012, 66, 1
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mode-route choice decisions: a case study of CPEC investment in Pakistan railways
Autorzy:
Ali, Yousaf
Sabir, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2173449.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
AHP-TOPSIS
hybrid-CDM
route-mode choice
wybór trybu pracy
Opis:
. This study proposes the use of multi-criteria decision models (MCDM) for transportation mode-route choice decisions. This method is beneficial when trips' microdata are unavailable. Route-mode choice decisions were investigated for three public transportation modes (buses, railways, and airlines) in the post-China Pakistan Economic Corridor (CPEC) investment in Pakistan Railways (PR) for a link between Peshawar and Karachi. TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution) was used for the mode choice decisions and a hybrid model of AHP (Analytical Hierarchy Approach) – TOPSIS was used for the route choice decision ML-1 link of PR. This study concludes that rails were the best mode of transportation in post-CPEC investment. Furthermore, route 3, linking Karachi to Peshawar via Lodhran, Multan, and Miniawali, is the best route connection among the four considered routes.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 115; 5--21
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
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:
Control of optical chaos spectrum in semiconductor laser for secure RoF communication
Autorzy:
Mazhar, Danish Ali
Ali, Syed Zafar
Islam, Muhammad Khawar
Powiązania:
https://bibliotekanauki.pl/articles/2172849.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chaos
radio over fiber
secure optical communication
Opis:
A critical requirement in optical chaos based secure radio over fiber (RoF) system design is the ability to control center frequency, spectral bandwidth, power level and signature of chaos to submerge message with sufficient horizontal and vertical margins both in time and frequency domains. Once frequency domain masking is completely achieved, time domain masking is met automatically, the former being more stringent. In a direct modulated semiconductor laser, the three control parameters are bias current (Ibias), modulation current (Imod) and modulation frequency (ωa). It is found that Imod increases bandwidth and amplitude dynamic range of chaotic pulses. Ibias increases the cavity power and hence average peak amplitude of laser chaotic pulses. The modulation frequency increases the speed of overall cavity dynamics and hence is used to increase the bandwidth of chaos but a corresponding increase in bias and modulation currents is required to support high repetition pulses. The results show relationship between three control parameters (bias current, modulation current and modulation frequency) in a direct modulated semiconductor laser and optical chaos bandwidth using regression.
Źródło:
Optica Applicata; 2022, 52, 4; 485--495
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection and enumeration of Enteric bacteria associated with food handlers and surfaces of food manufacturing industry located in Hub city, Pakistan
Autorzy:
Ali, Razim
Hayat, Amir
Fatima, Madiha
Noman, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/1182928.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
enterobacteriaceae
foodborne microbes
hygiene
surface contamination
food handlers
e. coli
sanitation
Opis:
Foodborne microorganisms harbor and adheres itself to the food material and surrounding surfaces for a long time and influence the food quality and consumers health. Among these microbes the presence of Enteric indicator bacteria in food premises confers the indication of entero-pathogens, i.e. E. coli, Salmonella, Shigella and Campylobacters that could cause severe systemic infections in consumers. In this study, the hygienic status of confectionery and supplementary food processing facility was evaluated. A total of 10497 examinations were performed on 3499 swab samples collected from food premises and handlers for the analysis of Enteric indicator bacteria. From swabs, 1277 (12.2%) isolates were identified in which Enterobacteriaceae were found with higher frequency 604 (47.3%) followed by Coliforms 293 (30.8%) and Escherichia coli 280 (21.9%) respectively. The mean count (CFU/cm2) was found maximum for plain surfaces (floors, walls and door), while the lowest was for equipment and machinery. Overall isolates percent prevalence was determined where Enterobacteriaceae were 47%, Coliforms 31% and Escherichia coli 22%. Majority of the floor surfaces were highly contaminated, where washing and sanitation practices were observed to be inappropriate. Worker hygiene status was lacking essential food safety and hygiene standards. In general, the Enteric bacteria were found with higher ratio, that could affect the food quality and quantity both to a greater extent with some influences on consumers health.
Źródło:
World Scientific News; 2016, 49, 2; 192-203
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
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