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Tytuł:
Three dimensional flow and mass transfer analysis of a second grade fluid in a porous channel with a lower stretching wall
Autorzy:
Khan, N. A.
Naz, F.
Powiązania:
https://bibliotekanauki.pl/articles/265824.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
równania różniczkowe
płyn lepki
pole przepływu
second grade fluid
stretching wall
suction
injection
Opis:
This investigation analyses a three dimensional flow and mass transfer of a second grade fluid over a porous stretching wall in the presence of suction or injection. The equations governing the flow are attained in terms of partial differential equations. A similarity transformation has been utilized for the transformation of partial differential equations into the ordinary differential equations. The solutions of the nonlinear systems are given by the homotopy analysis method (HAM). A comparative study with the previous results of a viscous fluid has been made. The convergence of the series solution has also been considered explicitly. The influence of admissible parameters on the flows is delineated through graphs and appropriate results are presented. In addition, it is found that instantaneous suction and injection reduce viscous drag on the stretching sheet. It is also shown that suction or injection of a fluid through the surface is an example of mass transfer and it can change the flow field.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 359-376
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of lean management implementation on organizational operational performance
Wpływ wdrożenia zarządzania typu lean na działania operacyjno-organizacyjne
Autorzy:
Hashmi, H.
Khan, N. R.
Haq, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/361959.pdf
Data publikacji:
2015
Wydawca:
Wyższa Szkoła Logistyki
Tematy:
operational performance
daily schedule adherence
repeat production
flow oriented layout
działalność operacyjna
przestrzeganie dziennego harmonogramu
powtarzalność produkcji
schemat przepływu
Opis:
Background: The research aims to develop the consensus between different operational improvement strategies, to address the relationship between the operational characteristics (lean) and operational performance of the organization. Methods: Variables from which the extraction of the outcomes has been established include operational performance, daily schedule adherence, repeat production and flow oriented layout. The technique of data analysis is selected to be Correlation and multiple regressions. The aim for performing these tests is to highlight association of lean strategy with the operational performance. Results and conclusions: The positive association is being established amongst the operational performance and the daily schedule adherence, flow oriented layout and the repeat production. It is suggested to the supply chain management that they must entail their production team for having repetition in their work and become efficient in their production. They must be reached to their optimization level, where they have to extract less waste and have high level of the production.
Wstęp: Celem pracy jest opracowanie konsensusu pomiędzy różnymi operacyjnymi strategiami usprawniającymi w celu znalezienia zależności pomiędzy operacyjnymi cechami organizacji a jej postępowaniem operacyjnym. Metody: Zmienne niezależne, które zostały użytego dla uzyskania zmiennej zależnej to działalność operacyjna, przestrzeganie dziennego harmonogramu, powtarzalność produkcji oraz schemat przepływu. Dane zostały poddane analizie korelacji i regresji wielokrotnej. Celem tych analiz był zbadanie zależności pomiędzy strategią Lean a działalnością operacyjną. Wyniki wnioski: Stwierdzono pozytywną zależność pomiędzy działalnością operacyjną a przestrzeganiem dziennego harmonogramu, powtarzalnością produkcji oraz schematem przepływu. Powinno to służyć jako wskazówka dla zarządzających łańcuchem dostaw aby dążyli do powtarzalności w swojej pracy, co pozwoli na osiągnięcie efektywności produkcji. Należy osiągnąć optymalny poziom, przy którym poziom strat będzie najniższy a poziom produkcji najwyższy.
Źródło:
LogForum; 2015, 11, 4; 375-385
1734-459X
Pojawia się w:
LogForum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of N-Methyl Indole Derivatives via Desulfitative Displacement by Various Amines and Its Antimicrobial Activity
Autorzy:
Chodvadiya, Vijay D.
Pambhar, Kaushik D.
Parmar, Nilesh D.
Dhamsaniya, Ashish P.
Safi, Shahrukh khan A.
Chhatbar, Pratiksha V.
Ram, Hemal N.
Khunt, Ranjan C.
Patel, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/1065130.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Anti-microbial agents
Desulfitative displacement
N-methyl indole
S-methyl
Opis:
A modular three step synthetic approach of N-methyl indole derivatives has been carried out by the condensation of N-methyl indole with cyanoacetic acid using acetic anhydride as solvent to yield 3-cyanoacetyl N-methyl indole, which further reacts with carbon disulphide and methyl iodide in basic condition to obtain 2-(1-methyl-1H-indole-3-carbonyl)-3,3-bis(methylthio)acrylonitrile as a scaffold. Subsequent, the scaffold when reacts with substituted various amine derivatives via desulfitative displacement forms new derivatives of 3-((substitutedphenyl)amino)-2-(1-methyl-1H-indole-3-carbonyl)-3-(methylthio)acrylonitrile in moderate to good yields. All the novel compounds were evaluated for their antimicrobial activity against Gram+ve and Gram-ve bacteria and different fungal species which demonstrated well to moderate antimicrobial activity.
Źródło:
World Scientific News; 2019, 120, 2; 181-191
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SUPERPAVE design mixture performance evaluation using Epolene modifier for cold semi-arid climatic region of Saudi Arabia
Autorzy:
Dahim, M.A.
Mosaby, M.
El Morabet, R.
Khan, R.A.
Alqadhi, S.
Khan, N.A.
Ben Kahla, N.
Neklonskyi, I.
Borysova, L.
Powiązania:
https://bibliotekanauki.pl/articles/2175741.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
SUPERPAVE
Epolene
dynamic modulus test
flow number test
indirect tensile test
badanie modułu dynamicznego
badanie liczby przepływu
pośrednia próba rozciągania
Opis:
Purpose: To evaluate the superpave design performance using Epolene (EE-2) as modifier, since SUPERPAVE design is a modified and sophisticated aspect as compared to previous mix design for asphalt mixtures. This is primarily due to the fact that superpave design mix also takes into consideration properties of materials beside asphalt. Design/methodology/approach: This study was conducted using Epolene (EE-2) as modifier in order to evaluate the performance of SUPERPAVE suitability for construction of roads in Alfaraa campus (King Khalid University) Abha, in Asir Province of Saudi Arabia. Glow number test, dynamic modulus test and indirect tensile strength test were conducted to evaluate the performance of EE-2 modifier against the control mixture. Findings: The mixture modified with EE-2 gave better performance in terms of temperature-based performance and resistance to moisture damage. Also, larger values of E*/sinφ were obtained for EE-2 modified mixture at various loading frequencies and temperature in comparison to control mixture. Research limitations/implications: The Epolene modifier successfully enhances and improves the SUPERPAVE mixture performance. Further studies are required to evaluate the performance of EE-2 modifier at much lower temperature ranges. Practical implications: The results of the study allow us to recommend the investigated asphalt mixture for applied for the construction of roads in the Alfaraa (new campus of King Khalid University), Abha, Asir province, Saudi Arabia. Originality/value: A modified asphalt mixture has been proposed that has better performance at higher and lower temperatures. The developed asphalt mixture is more resistant to moisture damage than the compared to control mixture.
Źródło:
Archives of Materials Science and Engineering; 2021, 112, 2; 49--54
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Estimation and Mathematical Modelling of Tropospheric Radio Refractivity Based on Meteorological Data
Autorzy:
Alimgeer, K. S.
Awais, M.
Ijaz, B.
Khan, S. A.
Subhan, F.
Ahmad, N.
Powiązania:
https://bibliotekanauki.pl/articles/221069.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radio refractivity
statistical estimation
ITU
mathematical modelling
Opis:
To obtain optimal performance, estimation of radio refractivity is essential in planning and design of radio links/systems. The dependence of radio refractivity on different climatic parameters such as temperature, pressure, humidity and scale height is studied. The method proposed by International Telecommunication Union (ITU) is used in calculation of tropospheric radio refractivity. The main objective of this work is to formulate a mathematical equation/expression which can be used to predict/estimate the value of radio refractivity for an arbitrary day of any year, with a low error of estimation, in a local environment. Sensitivity of radio refractivity to temperature, pressure and humidity has been evaluated for a period of 5 years from 2008 to 2012, in a particular area under consideration. The results presented for tropospheric radio refractivity take into consideration both the location height and scale height parameters. The results are analysed in terms of statistical measures such as the moving averages, probability density function, monthly mean values, and their corresponding standard deviations. Finally, a mathematical model is formulated to calculate the radio refractivity for any day of a whole year. Reliability of error analysis in respect to accuracy is also shown. It was implemented in the industrial enterprise.
Źródło:
Metrology and Measurement Systems; 2018, 25, 1; 115-128
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prevalence of races and biotypes of Ralstonia solanacearum in India
Autorzy:
Chandrashekara, K.N.
Prasannakumar, M.K.
Deepa, M.
Vani, A.
Khan, A.N.A.
Powiązania:
https://bibliotekanauki.pl/articles/65679.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Bacterial wilt caused by Ralstonia solanacearum is the most destructive disease of plants. Fifty-seven isolates of R. solanacearum causing wilt on different host plants viz., tomato (Solanum lycopersicum), brinjal (S. melongena), potato (S. tuberosum), bird of paradise (Strelitzia reginae), ginger (Zingiber officinale), chili (Capsicum annuum), capsicum (Capsicum annuum), davana (Artemisia pallens) and coleus (Coleus forskohlii) were collected from the different agro climatic zones of Karnataka and other parts of India. In this study, 57 isolates were differentiated into race on the basis of their pathogenicity and their ability to infect different host. The isolates were established as race-1. None of the isolates infected mulberry and banana. Fifty-four isolates oxidized and utilized both the disaccharides and sugar alcohols. These isolates were positioned as biovars-3 according to Haywards classification system. Three isolates from Kerala, two ginger, and one tomato strain were not able to utilize dulcitol and lactose. Hence, they were categorized into a new taxo group within the system and designated as biovar-3B for the first time in India. There were 54 isolates which were confirmed as race-1, biovar-3, and 3 isolates were confirmed as race-1, biovar-3B by morphological, physiological, biochemical and pathogenicity studies. Two sets of primers (OLI1 & Y2 and Y1 & Y2) were used in this study to authenticate the organism. Furthermore, the identity of the isolates was confirmed by a serological diagnostic kit obtained from the International Potato Research Center, Lima, Peru, and single chain variable fragment antibody specific to R. solanacearum.
Źródło:
Journal of Plant Protection Research; 2012, 52, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential of endochitinase gene to control Fusarium wilt and early blight disease in transgenic potato lines
Autorzy:
Fatima, Neelam
Tabassum, B.
Yousaf, I.
Malik, M.
Khan, A.
Sajid, I.A.
Tariq, M.
Toufiq, N.
Riaz, S.
Nasir, I.A.
Powiązania:
https://bibliotekanauki.pl/articles/2084713.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
early blight disease
Fusarium
potato
Trichoderma
Opis:
Potato (Solanum tuberosum L.), an important food crop in the world, is susceptible to many fungal pathogens including Alternaria solani and Fusarium oxysporum causing Fusarium wilt and early blight diseases. Mycoparasitic fungi like Trichoderma encode chitinases, cell wall degrading enzymes, with high antifungal activity against a wide range of phytopathogenic fungi. In this study, a binary vector harboring endochitinase gene of ~1,000 bp was constructed and used to transform potato nodes through Agrobacterium-mediated transformation. Out of several primary transformants, two transgenic potato lines were verified for transgene insertion and integration by Southern blot. In a pot experiment for Fusarium resistance, the transgenic potato lines didn’t show any symptoms of disease, instead they remained healthy post infection. The transgenic potato lines exhibited 1.5 fold higher mRNA expression of endochitinase at 7 days as compared to 0 day post fungus inoculation. It was evident that the mRNA expression decreased over days of inoculation but was still higher than at 0 day and remained stable upto 30 days post inoculation. Similarly, for A. solani infection assay, the mRNA expression of the endochitinase gene was 3 fold higher 7 days post inoculation compared to expression at 0 day. Although the expression decreased by1.2 fold during subsequent days post infection, it remained stable for 30 days, suggesting that protection in transgenic potato plants against fungal pathogens was achieved through an increase in endochitinase transcript.
Źródło:
Journal of Plant Protection Research; 2019, 59, 3; 376-382
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pollution and health risk assessment of water quality: a case study in Mohammedia prefecture in Morocco
Autorzy:
El morabet, R.
Berhazi, L.
Khan, R. A.
Bouhafa, S.
Khan, N. A.
Hakh, T.
Romaniv, A.
Powiązania:
https://bibliotekanauki.pl/articles/2055750.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
water quality assessment
water pollution index
ecological risk
non-carcinogenic risk
carcinogenic risk
ocena jakości wody
wskaźnik zanieczyszczenia wody
ryzyko ekologiczne
ryzyko nierakotwórcze
ryzyko rakotwórcze
Opis:
Purpose: Water is vital for the sustenance of every life form. Urbanization, growing population and industrial development has led to exploitation of water resources globally. This study assesses quality of water resources of Mohammedia prefecture. Design/methodology/approach: The water quality analysis was carried out based on physio-chemical and heavy metal concentrations. The physio-chemical analysis comprised of status of concentration, overall quality and water pollution index evaluation. The heavy metal evaluation consisted of Ecological Risk Index, non-carcinogenic risk and carcinogenic risk assessment. Findings: The landfill near Ben Nfifikh River reported insignificant (WPI<1) – low level of pollution (>1≤1.5) for surface and groundwater points. However, the groundwater for Zenata region was found to pose both carcinogenic (CRt > 0.0001, range 0.4-35.31) and non-carcinogenic risks (HQ>1, range 6 -34) of higher degree rendering it unfit for human consumption. Hence, this study concludes that groundwater resources should not as water supply; instead, Oud El Maleh River can serve as surface water source for meeting requirements of Zenata region. Research limitations/implications: The data obtained can be categorized as landfill area near river Nfifikh and landfill area near river El Maleh. Both areas have been investigated for groundwater and surface water quality assessment. Practical implications: This study demonstrates the need to study the characteristics of groundwater (depth, flow rate, water renewal, etc.) before arranging a waste dump. This problem is especially relevant for arid countries, since residents experience a shortage of water, as well as a lack of rainfall provides a weak renewal of groundwater, which can contribute to the accumulation of a higher concentration of carcinogens in groundwater and provide a high risk to public health. If policymakers in arid countries and decision-makers have effective water quality maps, then the country can be more efficiently managed water resources without risking the population. Originality/value: The current study is planned as a multi-stage, each of which is supposed to conduct field studies of groundwater and surface water quality with appropriate parameters, analysis of institutional reports and related scientific studies in order to create an effective water quality map for rational water use.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 110, 2; 67--85
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peach antioxidant and phenolic activities influenced by the application of 1-methylcyclopropene (1-MCP) at post-harvest
Autorzy:
Shah, S.T.
Sajid, M.
Khan, N.U.
Rab, A.
Amin, N.U.
Arif, M.
Haleema, B.
Saeed, S.
Powiązania:
https://bibliotekanauki.pl/articles/12297475.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
peach tree
Prunus persica
fruit tree
antioxidant activity
phenolic compound activity
1-methylcyclopropene
catalase activity
fruit
fruit decay
storage durability
shelf life
Opis:
Early maturing peach (Prunus persica) cultivars can fetch good market value but face a lot of post-harvest problems that lead to the post-harvest losses. The 1-methylcyclopropene (1-MCP) can provide new insights into plant ethylene responses and extend the shelf life and quality of fruits. Therefore, fruits of peach cultivar ‘Early Grand’ were dipped in various concentrations of 1-MCP (0, 0.3, 0.6 and 0.9 µg l–1), stored for 40 days at 8 ±2°C with 50% relative humidity and analyzed the fruits for physicochemical attributes at 10 days interval. The highest concentration of 1-MCP at 0.9 µg l–1 significantly improved the activity of antioxidants, catalase, free radical scavenging assay and total phenols. However, the peach fruits treated with 1MCP at 0.6 µgL–1 was effective in retaining the ascorbic acid, lowering the weight loss and fruit decay. Therefore, peach fruits can be treated with 1-MCP (0.6 µg l–1) solution for prolonging its shelf life up to 40 days under low temperature.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 2; 71-85
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Micromachining with a Focus on Miniature Gears by Non Conventional Processes. A Status Report
Autorzy:
Chaudhary, T.
Siddiquee, A. N.
Chanda, A. K.
Khan, Z. A.
Powiązania:
https://bibliotekanauki.pl/articles/139762.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wire electrical discharge machining
WEDM
electrochemical machining
ECM
micro-electrical discharge machining
micro-EDM
wycinanie elektroerozyjne
obróbka elektrochemiczna
mikroobróbka elektroerozyjna
mikro-EDM
Opis:
Recent developments in automation and technology have revolutionized the way products are made. It is directly seen in the evolution of part miniaturization in the sectors such as aerospace, electronics, biomedicine and medical implants. Micromachining is a promising technology to fulfill the need of miniaturization. A review has been done on the micromachining processes such as micro electric discharge machining (micro-EDM) and wire EDM (WEDM), micro electrochemical machining (micro-ECM). Recent literature were studied and categorized in terms of materials, process parameters, performances, product manufactured, and miniature product generation. Starting with brief introduction to micromachining, classifications and applications, technical aspects of discussions from the literature have been presented on key factors such as parameters and the response variables. Important aspects of recast layer, heat effected zone, micro-hardness, micro cracks, residual stress, etc., have been given. A special focus is given to the status of the research on microgear manufacturing. Comparison has been made between other conventional process suitable for micro-gear manufacturing and WEDM. The miniature gear machined by WEDM shows the defect-free microstructure, better surface finish, thin recast layer and improved gear quality parameters such as profile and pitch. Finally, the research gaps and future research directions have been presented.
Źródło:
Archive of Mechanical Engineering; 2018, LXV, 1; 129-169
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Simulations for Solving Fuzzy Fractional Differential Equations by max-min Improved Euler Methods
Autorzy:
Khan, N. A.
Razzaq, O. A.
Riaz, F.
Powiązania:
https://bibliotekanauki.pl/articles/108688.pdf
Data publikacji:
2015
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
fuzzy
improved Euler method
numerical solution
Mathematica 10
Opis:
In this paper, an extension is introduced into Max-Min Improved Euler methods for solving initial value problems of fuzzy fractional differential equations (FFDEs). Two modified fractional Euler type methods have been proposed and investigated to obtain numerical solutions of linear and nonlinear FFDEs. The proposed algorithms are tested on various illustrative examples. Exact values are also simulated to compare and discuss the closeness and accuracy of approximations so obtained. Comparatively, tables and graphs results reveal the complete reliability, efficiency and accuracy of the proposed methods.
Źródło:
Journal of Applied Computer Science Methods; 2015, 7 No. 1; 53-83
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heterosis for yield and yield components in diallel crosses of Brassica napus L.
Heterozja dla plonu i jego składników w krzyżowaniu diallelicznym rzepaku (Brassica napus L.)
Autorzy:
Farhatullah, F.
Khan, N.A.
Abbas, S.J.
Powiązania:
https://bibliotekanauki.pl/articles/832735.pdf
Data publikacji:
2006
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
heterosis
yield
yield component
diallel cross
Brassica napus
hybrid
F1 hybrid
rapeseed
Pakistan
breeding programme
plant breeding
Źródło:
Rośliny Oleiste - Oilseed Crops; 2006, 27, 1
1233-8273
Pojawia się w:
Rośliny Oleiste - Oilseed Crops
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic diversity of Brassica rapa germplasm of Khyber Pakhtunkhwa Pakistan revealed by molecular markers
Autorzy:
Ali, N.
Ali, S.
Khan, N.U.
Jan, S.A.
Rabbani, M.A.
Hussain, I.
Powiązania:
https://bibliotekanauki.pl/articles/12690092.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Pakistan
plant breeding
Brassica rapa
germplasm
genetic diversity
plant genotype
molecular marker
SSR marker
Opis:
A total of 96 indigenous Brassica rapa accessions were collected from different locations of Khyber Pakhtunkhwa, Pakistan. Simple Sequence Repeats (SSR) markers were used to identify the most diverse genotypes among the collected lots. Twenty six (26) different SSR primers were used for (genetic) variability among collected genotypes. These primers were selected from literature based on their previous results. These primers produced 135 scorable bands of which 75 were polymorphic, with an average of 55.5% polymorphic loci, and reflected the broader genetic background of the collected genotypes. An average 2.88 polymorphic bands with an average PIC value of 0.49 was recorded. Unweighted Pair Group Method with Arithmetic Mean (UPGMA) divided all genotypes into three main groups. Group one contained three clusters, while group two and three had four and two clusters each. Based on the UPGMA dendrogram, genotypes collected from Kohat, Bannu, Swat and Haripur showed considerable amount of variation. From the present study, it is concluded that SSR markers can be proved as the best tool for the genetic variability of other local and exotic B. rapa genotypes.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 6; 57-65
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Friction Stir Welds of Al Alloy-Cu. An Investigation on Effect of Plunge Depth
Zgrzewanie tarciowe z przemieszaniem stopu aluminium z miedzią. Badanie wpływu zagłębienia trzpienia
Autorzy:
Wahid, M. A.
Siddiquee, A. N.
Khan, Z. A.
Asjad, M.
Powiązania:
https://bibliotekanauki.pl/articles/140144.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir welding
FSW
copper
aluminum
tensile strength
nugget zone
microhardness
spawanie tarciowe z przemieszaniem
miedź
aluminium
wytrzymałość na rozciąganie
strefa ziarnista
mikrotwardość
Opis:
In the present study, butt joints of aluminum (Al) 8011-H18 and pure copper (Cu) were produced by friction stir welding (FSW) and the effect of plunge depth on surface morphology, microstructure and mechanical properties were investigated. The welds were produced by varying the plunge depth in a range from 0.1 mm to 0.25 mm. The defect-free joints were obtained when the Cu plate was fixed at the advancing side. It was found that less plunging depth gives better tensile properties compare to higher plunging depth because at higher plunging depth local thinning occurs at the welded region. Good tensile properties were achieved at plunge depth of 0.2 mm and the tensile strength was found to be higher than the strength of the Al (weaker of the two base metals). Microstructure study revealed that the metal close to copper side in the Nugget Zone (NZ) possessed lamellar alternating structure. However, mixed structure of Cu and Al existed in the aluminum side of NZ. Higher microhardness values were witnessed at the joint interfaces resulting from plastic deformation and the presence of intermetallics.
W pracy przedstawiono spawy czołowe aluminium (Al) 8011-H18 i czystej miedzi (Cu) wykonane techniką spawania tarciowego z przemieszaniem (FSW). Badano wpływ zagłębienia trzpienia na morfologię powierzchni, mikrostrukturę i właściwości mechaniczne spawu. Spawy wykonano przy zmiennym zagłębieniu trzpienia narzędzia w zakresie od 0,1 do 0,25 mm. Złącza bez defektów otrzymano, gdy płyta miedziana była zamocowana po stronie natarcia przesuwu. Stwierdzono, że przy mniejszym zagłębieniu narzędzia uzyskuje się większą wytrzymałość na rozciąganie niż przy większych zagłębieniach, przy których występuje lokalne pocienienie w regionie spawania. Dobre właściwości uzyskano przy zagłębieniu 0,2 mm, a wytrzymałość spawu na rozciąganie była większa niż wytrzymałość aluminium (słabszego z dwu metali). Badanie mikrostruktury ujawniło, że metal po stronie miedzi miał w strefie rekrystalizacji (strefie ziarnistej) spawu (WNZ) strukturę płytkową o charakterze przemiennym. Natomiast mieszana struktura Cu i Al istniała w strefie rekrystalizacji po stronie aluminium.Wyższe wartości mikrotwardości były obserwowane w obszarach międzyfazowych złącza, co wynikało z odkształceń plastycznych i obecności związków międzymetalicznych.
Źródło:
Archive of Mechanical Engineering; 2016, LXIII, 4; 619-634
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Followership moderation between the relationship of transactional leadership style and employees reactions towards organizational change
Umiar w podążaniu za przywódcą pomiędzy relacjami transakcyjnego stylu przywództwa a reakcjami pracowników w kierunku zmiany organizacyjnej
Autorzy:
Khan, S. N.
Busari, A. H.
Abdullah, S. M.
Mughal, Y. H.
Powiązania:
https://bibliotekanauki.pl/articles/405181.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska
Tematy:
transactional leadership style
followership
employees’ reactions
organizational change
Pakistan
transakcyjny styl przywództwa
podążanie za przywódcą
reakcje pracowników
zmiana organizacyjna
Opis:
The purpose of the present study is to analyze the relationship between transactional leadership style and factors of employees’ reactions towards organizational change in the telecommunication companies of Pakistan. Furthermore, to understand the importance of followership this study has also incorporated followership as a moderating variable. Quantitative methodology is applied to investigate the underline relationships. The Pearson correlation results have identified that transactional leadership is positively related to all three factors (frequency of change, trust in management, and employees’ participation) of employees’ reactions towards change. The moderation results further clarify that followership significantly moderates the relationship between transactional leadership style, frequency of change and employees participation. However, there is no moderation effect found between transactional leadership style and trust in management.
Celem niniejszego badania jest analiza związku między stylem przywództwa transakcyjnego a czynnikami reakcji pracowników na zmiany organizacyjne w przedsiębiorstwach telekomunikacyjnych w Pakistanie. Ponadto, aby zrozumieć znaczenie podążania za przywódcą, zostało ono włączone jako zmienna moderująca. W celu zbadania istniejących zależności, zastosowana została metodologia ilościowa. Wyniki korelacji Pearsona wykazały, że przywództwo transakcyjne jest pozytywnie powiązane ze wszystkimi trzema czynnikami (częstością zmian, zaufaniem do zarządzania i udziałem pracowników) reakcji pracowników na zmiany. Uzyskane wyniki pozwoliły stwierdzić, że wyniki moderacji dodatkowo wyjaśniły, że podążanie za przywódcą znacząco moderowało związek pomiędzy stylem przywództwa transakcyjnego, częstotliwością zmian a udziałem pracowników. Jednak nie znaleziono efektu powiązania pomiędzy stylem przywództwa transakcyjnego a zaufaniem do zarządzania.
Źródło:
Polish Journal of Management Studies; 2018, 17, 1; 131-143
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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