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Tytuł:
Classification of EEG Signals Using Adaptive Time-Frequency Distributions
Autorzy:
Khan, N. A.
Ali, S.
Powiązania:
https://bibliotekanauki.pl/articles/221878.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Adaptive Directional Time-Frequency Distribution
EEG signals
Time-Frequency features
pattern recognition
Opis:
Time-Frequency (t-f) distributions are frequently employed for analysis of new-born EEG signals because of their non-stationary characteristics. Most of the existing time-frequency distributions fail to concentrate energy for a multicomponent signal having multiple directions of energy distribution in the t-f domain. In order to analyse such signals, we propose an Adaptive Directional Time-Frequency Distribution (ADTFD). The ADTFD outperforms other adaptive kernel and fixed kernel TFDs in terms of its ability to achieve high resolution for EEG seizure signals. It is also shown that the ADTFD can be used to define new time-frequency features that can lead to better classification of EEG signals, e.g. the use of the ADTFD leads to 97.5% total accuracy, which is by 2% more than the results achieved by the other methods.
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 251-260
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A smart amalgamation of spectral neural algorithm for nonlinear Lane-Emden equations with simulated annealing
Autorzy:
Khan, N. A.
Shaikh, A.
Powiązania:
https://bibliotekanauki.pl/articles/91814.pdf
Data publikacji:
2017
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
Lane-Emden equations
simulated annealing
legendre polynomials
neural network
Opis:
The actual motivation of this paper is to develop a functional link between artificial neural network (ANN) with Legendre polynomials and simulated annealing termed as Legendre simulated annealing neural network (LSANN). To demonstrate the applicability, it is employed to study the nonlinear Lane-Emden singular initial value problem that governs the polytropic and isothermal gas spheres. In LSANN, minimization of error is performed by simulated annealing method while Legendre polynomials are used in hidden layer to control the singularity problem. Many illustrative examples of Lane-Emden type are discussed and results are compared with the formerly used algorithms. As well as with accuracy of results and tranquil implementation it provides the numerical solution over the entire finite domain.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2017, 7, 3; 215-224
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Entropy generation on mhd flow of Powell-Eyring fluid between radially stretching rotating disk with diffusion-thermo and thermo-diffusion effects
Autorzy:
Khan, N. A.
Aziz, S.
Ullah, S.
Powiązania:
https://bibliotekanauki.pl/articles/386796.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
axisymmetric flow
entropy generation
stretching disk
Powell-Eyring fluid
diffusion
Opis:
An investigation is performed for an alyzing the effect of entropy generation on the steady, laminar, axisymmetric flow of an incompressible Powell-Eyring fluid. The flow is considered in the presence of vertically applied magnetic field between radially stretching rotating disks. The Energy and concentration equation is taking into account to investigate the heat dissipation, Soret, Dufour and Joule heating effects. To describe the considered flow non-dimensionalized equations, an exact similarity function is used to reduce a set of the partial differential equation into a system of non-linear coupled ordinary differential equation with the associated boundary conditions. Using homotopy analysis method (HAM), an analytic solution for velocity, temperature and concentration profiles are obtained over the entire range of the imperative parameters. The velocity components, concentration and temperature field are used to determine the entropy generation. Plots illustrate important results on the effect of physical flow parameters. Results obtained by means of HAM are then compared with the results obtained by using optimized homotopy analysis method (OHAM). They are in very good agreement.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 1; 20-32
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
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:
Comparative analysis of variants of Gabor-Wigner Transform for crossterm reduction
Autorzy:
Ajab, M.
Taj, I. A.
Khan, N. A.
Powiązania:
https://bibliotekanauki.pl/articles/221743.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Wigner Distribution
Gabor transform
Gabor Wigner Transform
fractional Fourier transform
Opis:
Gabor Wigner Transform (GWT) is a composition of two time-frequency planes (Gabor Transform (GT) and Wigner Distribution (WD)), and hence GWT takes the advantages of both transforms (high resolution of WD and cross-terms free GT). In multi-component signal analysis where GWT fails to extract auto-components, the marriage of signal processing and image processing techniques proved their potential to extract autocomponents. The proposed algorithm maintained the resolution of auto-components. This work also shows that the Fractional Fourier Transform (FRFT) domain is a powerful tool for signal analysis. Performance analysis of modified fractional GWT reveals that it provides a solution of cross-terms of WD and blurring of GT.
Źródło:
Metrology and Measurement Systems; 2012, 19, 3; 499-508
0860-8229
Pojawia się w:
Metrology and Measurement Systems
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:
Developed jet-centrifugal spray devices: experimental testing to establish the possibility of their application in plants spraying technologies
Autorzy:
Vambol, S.
Khan, N. A.
Khan, A. H.
Kiriyenko, M.
Borysova, L.
Taraduda, D.
Zakora, A.
Bilotserkivska, N.
Powiązania:
https://bibliotekanauki.pl/articles/1818826.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
jet-centrifugal spray device
experimental testing
operational characteristics
plants spraying
urządzenie natryskowe
badania eksperymentalne
właściwości eksploatacyjne
opryskiwanie roślin
Opis:
Purpose: Experimentally substantiate the possibility of using the developed jet-centrifugal spraying device in plants spraying technologies. Design/methodology/approach: Many years of experience in creating spraying devices for solving practical problems in various industries made it possible to propose a design diagram of a single-phase jet-centrifugal spraying device. The tests were aimed at achieving device characteristics that are acceptable for use in plants spraying technologies such as jet coverage distance, droplet size and droplet deposition area (spray diameter). For this a several tests series with different design parameters was done. Before testing, the tightness of the device body was checked (the holding time under a pressure of 1 MPa is not less than 2 minutes). Findings: Based on the obtained jet coverage distance, droplet size and droplet deposition area, the developed spray device of some modifications can be used in plants spraying technologies. However, it is necessary to determine the quality of the spray device according to the BCPC classification; the device should be tested with some insecticides, fungicides and in plants spraying technologies to develop recommendations for their use. Research limitations/implications: The influence of design features of developed jetcentrifugal spray device on the jet coverage distance, droplet size and droplet deposition area was studied. Practical implications: The results obtained are useful in the field of improving national plants spraying technologies in order to improve the quality of the plant protection agent application and reduce the loss of the drug into the environment. Originality/value: To ensure maximum efficiency the proposed design of the jetcentrifugal spray device can be upgraded directly by the farmer by installing interchangeable nozzles that are attached with a union nut. Replaceable nozzles have different diameters and modifications and can be selected depending on the required jet coverage distance and spraying dispersion according to the current environmental conditions.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2020, 102, 1; 30--41
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drought tolerance of Leucophyllum frutescens: physiological and morphological studies reveal the potential xerophyte
Autorzy:
Younish, A.
Riaz, A.
Tariq, U.
Nadiem, M.
Khan, N.A.
Ahsan, M.
Adli, W.
Naseem, M.K.
Powiązania:
https://bibliotekanauki.pl/articles/11803372.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Xeriscaping focus on the use of drought tolerant species of plants for environmental sustainability leading to the conservation of natural resources. We need to look for drought tolerant, water efficient plant species. Present research was aimed to assess the water use efficiency of Leucophyllum frutescens (silvery) for its adaptability and potential as xerophyte. In this study, seven treatments were applied were 100% field capacity was considered as control while 85%, 70%, 55%, 40%, 25% and 5% field capacities were taken as different drought levels. Effect of drought commenced at 40% field capacity and lower drought treatments as decrease in shoot and root fresh and dry weight, root length, leaf area and leaf area index and leaf firing percentage increased with severity of drought compared to 100% field capacity. Physiological parameters including water use efficiency (A/E), leaf water potential (ψleaf), stomatal conductance (gs), photosynthesis rate, cell membrane stability and total chlorophyll contents proved that this plant species can tolerate severe drought conditions. Positive correlation was found among most of the attributes but leaf temperature was negatively correlated with leaf water potential, photosynthesis rate, cell membrane stability, and chlorophyll contents. Moreover, regression analysis between various morphological and physiological attributes showed the predictive power of the model yielding significant results for leaf area and cell membrane stability (R2 = 0.74), root length and photosynthesis rate (R2 = 0.65), leaf temperature and chlorophyll contents (R2 = 0.43) and leaf area and leaf water potential (ψleaf) (R2 = 0.93).
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 6; 89-98
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of the workplace environment by physical factors and SMART monitoring
Autorzy:
Kruzhilko, O.
Polukarov, O.
Vambol, S.
Vambol, V.
Khan, N. A.
Maystrenko, V.
Kalinchyk, V. P.
Khan, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/1818508.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
environmental physical factors
occupational health
monitoring
occupational health and safety management system
decision-making algorithm
środowiskowe czynniki fizyczne
zdrowie zawodowe
monitorowanie
system zarządzania bezpieczeństwem i higieną pracy
algorytm decyzyjny
Opis:
Purpose: To develop and implementation in practice an algorithm for smart monitoring of workplace environmental physical factors for occupational health and safety (OSH) management. Design/methodology/approach: A brief conceptual analysis of existing approaches to workplace environmental physical factors monitoring was conducted and reasonably suggest a decision-making algorithm to reduce the negative impact of this factors as an element of the OSH management system. Findings: An algorithm has been developed that provides continual improvement of the OSH management system to improve overall labour productivity and which has 3 key positive features: (1) improved data collection, (2) improved data transfer and (3) operational determination of the working conditions class. Research limitations/implications: The implementation of the proposed algorithm for substantiating managerial decisions to reduce the negative impact of workplace physical factors is shown by the example of four workplace environmental physical factors in the products manufacture from glass. Practical implications: If management decisions on the implementation of protective measures are taken in accordance with the proposed monitoring algorithm, these decisions will be timely and justified. This makes it possible to reduce the time of the dangerous effects of physical factors on the health of workers and reduce the level of these factors to improve working conditions. That is, an algorithm is proposed that provides continuous improvement of the OSH management system to increase overall labour productivity. Originality/value: Current monitoring of workplace environmental physical factors values are carried out in accordance with the justified monitoring intervals for each factor that provides the necessary and sufficient amount of data and eliminates the transfer of useless data.
Źródło:
Archives of Materials Science and Engineering; 2020, 103, 1; 18--29
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collection of hospital wastewater data using deduplication approaches
Autorzy:
Khan, N. A.
Sinha, G. R.
Ahmed, S.
Feshchenko, A.
Changani, F.
Qureshi, A.
Mazhar, M. A.
Neklonskyi, I.
Powiązania:
https://bibliotekanauki.pl/articles/1818511.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
statistics
hospital wastewater
medical waste
deduplication
approaches
servers
statystyka
ścieki szpitalne
odpady medyczne
deduplikacja
podejścia
serwery
Opis:
Purpose: This investigation aims to study the various approaches currently used to reduce the load on computer servers in order to better manage data on hospital wastewater treatment and solid waste generation. Design/methodology/approach: This manuscript investigates the taxonomies of deduplication procedures based on literature and other data sources, thereby presenting its classification and its challenges in detection. Findings: Based on the literature survey of deduplication techniques, the method of deduplication dispensed on cloud gadget devices has been found to be a promising research challenge. The gaps discussed include a reduction in storage space, bandwidth, type of disks used, and expenditure on energy usage and heat emissions when implementing these strategies. The art work on a scalable, robust, green and allocated approach to deduplication for a cloud gadget will remain of interest in destiny. Research limitations/implications: Considerable attention is focused on the deduplication due to efficient, extensive storage system. Practical implications: This research paper will be useful to identify deduplication techniques which are nowadays used in different hospital wastewater data collection systems and put significant proposals for further improvements in deduplication. Originality/value: This manuscript portrays a broader assessment of the available literature for data duplication along with the classification of different methods for the data storage used in the different level of storage of hospital wastewater data collection.
Źródło:
Archives of Materials Science and Engineering; 2020, 104, 1; 5--18
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
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:
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:
A novel approach to enhance performance of multilayer coated carbide insert in hard turning
Nowe podejście do poprawy osiągów w toczeniu na twardo przy użyciu wielowarstwowej płytki z ceramiki narzędziowej
Autorzy:
Shihab, S. K.
Khan, Z. A.
Siddiquee, A. N.
Khan, N. Z.
Powiązania:
https://bibliotekanauki.pl/articles/140027.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hard turning
flank wear
Taguchi approach
multi-coated carbide
micro-channel
toczenie na twardo
zużycie krawędzi
podejście Taguchi
węglik wielowarstwowy
mikrokanał
Opis:
Flank wear of multilayer coated carbide (TiN/TiCN/Al2O3/TiN) insert in dry hard turning is studied. Machining under wet condition is also performed and flank wear is measured. A novel micro-channel is devised in the insert to deliver the cutting fluid directly at the tool-chip interface. Lower levels of cutting parameters yield the minimum flank wear which is significantly affected by cutting speed and feed rate. In comparison to dry and wet machining, insert with micro-channel reduces the flank wear by 48.87% and 3.04% respectively. The tool with micro-channel provides saving of about 87.5% in the consumption of volume of cutting fluid and energy.
W pracy przedstawiono badania nad zużyciem krawędzi skrawającej wielowarstwowej płytki z ceramiki narzędziowej (TiN/TiCN/Al2O3/TiN) w toczeniu twardym na sucho. Badano także zużycie krawędzi skrawającej w warunkach toczenia na mokro. Nowatorskim rozwiązaniem było zastosowanie mikrokanału w płytce skrawającej, przez który płyn smarny dostarczany jest bezpośrednio do styku między narzędziem i wiórem. Uzyskany tą drogą niższy poziom parametrów skrawania zapewnia minimalne zużycie krawędzi skrawającej, na które w istotny sposób wpływają prędkość skrawania i szybkość posuwu. W porównaniu do warunków toczenia na sucho i na mokro, zastosowanie mikrokanału zmniejsza zużycie krawędzi skrawającej o odpowiednio 48,87% i 3,04%. Narzędzie z mikrokanałem zapewnia także oszczędność zużycia płynu smarnego i energii o ok. 87,5%.
Źródło:
Archive of Mechanical Engineering; 2015, LXII, 4; 539-552
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges and prospects of contraceptives use among women attending family planning services in Yobe State, Nigeria
Autorzy:
Imam, Mohammed A. N. A.
Khan, Bhola
Powiązania:
https://bibliotekanauki.pl/articles/1075579.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Challenges
Contraceptives
Family Planning
Prospects
Services
Opis:
The study focuses on the challenges and prospects of contraceptive use among the women attending family planning services in Potiskam general hospital. The main objective of this study is to identify the major challenges facing the ideal use of the best contraceptive methods among women and to address the available prospects to be adapted in order to contribute for the improvement of family planning services in Yobe State. The population of the to study comprises of one hundred women attending family planning services in Potiskam General Hospital, and Sample size technique adopted using Krejcie and Morgan formula. The structured questionnaire was used to collect data for this study. The data obtained were analyzed by using mean and standard deviation. The findings of the study revealed that the fear of health risk, Lack of consensus among partners, Cultural norms and Religious are considered as the main challenges prevent family planning practice among women mainly the use of contraceptive methods. The findings also revealed that, the use of withdrawal (Coitus Interrupts), the use of Oral Contraceptives (The Pills) method, the use of Female and male Condoms is some of the common methods of family planning devices among women in study area. Finally, the results indicated that, the use of mass media campaign to educate women about family planning devices, use of symbols to display appropriate family planning equipment’s for women and use of guidance and counseling in Primary Health Care to educate women about family planning devices are some of the available prospects and solutions to be adopted for effective promoting family planning services in general and use of contraceptives in particular among women. It is recommended among others that, there is need for government through the Ministry of Health and its partners to revive and support family planning education to both household and community level.
Źródło:
World Scientific News; 2019, 122; 122-132
2392-2192
Pojawia się w:
World Scientific News
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:
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:
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:
Effect of Isothermal Treatment on Ni3Al Coatings Deposited by Air Plasma Spraying System
Autorzy:
Mehmood, K.
Rafiq, M. A.
Durrani, Y. A.
Khan, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/354178.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
air plasma spraying
Ni-20Al
residual stresses
intermetallic coating
nickel aluminide
Opis:
Ni3Al coatings were obtained on AISI 321 steel samples by air plasma spraying system. The behavior of heat treatment on intermetallic coatings were evaluated after exposure at various temperatures i.e. 500ºC to 800ºC. The stay time in this regard was varied from 10 to 100 hours. The coatings were then characterized by X-Ray diffraction analysis, optical and scanning electron microscopy, eddy current measurements and stress analysis. It was observed that the formation of NiO increases drastically with time and temperature. The hardness of the coating increases with the formation of NiO. It was noted that the residual stresses can be correlated with the formation of NiO. Further, the development of residual stresses can be monitored by a non-destructive technique i.e. eddy current method.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 277-283
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of chilling exposure and vapor heat treatment duration on the quality of sweet orange during simulated marketing
Autorzy:
Hussain, I.
Rab, A.
Khan, N.U.
Sajid, M.
Ali, N.
Khan, S.M.
Ali, S.
Powiązania:
https://bibliotekanauki.pl/articles/11543553.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Sweet orange fruits were exposed to vapor heat treatment (50°C) in water bath for 0, 5, 10, 15 and 20 min in plastic covered structure. The data were recorded on different physico chemical factors immediately after the storage and after seven days simulated marketing under ambient condition (20°C). Low temperature storage enhanced weight loss, surface pitting, disease incidence, total soluble solids accumulation, TSS/Acid ratio but decreased reducing sugars, acidity and ascorbic acid content. Chilling exposure up to 45 days had no significant effect on weight loss and TSS. However, increased weight loss (2.63%), TSS (11.75), TSS/Acid ratio (8.45 ºBrix), disease incidence (8.93%) and lowest reducing sugars (3.90) were noted in sweet orange exposed to chilling temperature for 75 days. Among the VHT durations, the highest weight loss (2.29%) was found in VHT for 0 min while the highest TSS (11.81 ºBrix), TSS/Acid ratio (8.10) and disease incidence (6.22%) and least reducing sugars (4.12%) were found in VHT 20 for min. Vapor heat treatment ranging from 5–10 min resulted in lowest weight loss (1.79%), TSS (10.81 ºBrix) TSS/Acid ratio (7.33), disease incidence (1.00%) and highest reducing sugars (4.75%) in sweet orange fruits. However, non-reducing sugars were least affected by both LTSs and VHTs. It is concluded that the chilling exposure (5°C) beyond 45 days aggravated the decline of fruit physio-chemical quality characteristics. Whereas, VHT with 5–10 min maintained the sweet orange fruit quality during simulated marketing; however, VHT of 15–20 min adversely affected the sweet orange fruit quality attributes.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 5; 39-47
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
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:
Effect of flux composition on the percentage elongation and tensile strength of welds in submerged arc welding
Efekt składu topnika na wydłużenie procentowe i wytrzymałość na rozciąganie spawów przy spawaniu łukiem krytym
Autorzy:
Singh, B.
Khan, Z. A.
Siddiquee, A. N.
Maheswari, S.
Sharma, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/140322.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultimate tensile strength
carbon equivalent
basicity index
elements transfer
delta quantity
UTS
wytrzymałość na rozciąganie
równoważnik węglowy
współczynnik zasadowości
transfer pierwiastków
wielkość delta
Opis:
This experimental study reveals the effects of CaF2, FeMn and NiO additions to the base fluxes on tensile strength and percentage elongation of the weld metal. The aim of this study is to develop suitable flux for mild steel for high tensile strength, impact strength and ductility. Bead on plate welds were made using submerged arc welding process. Mathematical model for percentage elongation and UTS of mild steel welds were made. The elements transfer to the welds have been correlated with the above mechanical performance characteristics. The effect of oxygen content on weld elongation and UTS also has been deduced. This study shows that CaF2 and NiO are the significant factors for tensile strength while FeMn is not significant for tensile strength. However, for elongation besides CaF2, the interaction of CaF2 and FeMn was also found significant. The effects of basicity index of the flux and carbon equivalent of the welds on tensile strength and percentage elongation of the welds have also been evaluated.
W studium eksperymentalnym, przedstawionym w pracy, pokazano wpływ domieszek CaF2, FeMn i NiO do podstawowego składu topnika na wytrzymałość na rozciąganie i procentowe wydłużenie metalu spawu. Celem studium było opracowanie topnika odpowiedniego dla stali niskowęglowej, który zapewnia wysoką wytrzymałość na rozciąganie, wytrzymałość na udary i plastyczność. Ściegi spawów wykonano metodą spawania łukiem krytym. Opracowano model matematyczny wydłużenia procentowego i wytrzymałości na rozciąganie (UTS) dla spawów ze stali niskowęglowej. Zbadano korelację między wymienionymi charakterystykami mechanicznymi a transferem pierwiastków do spawu. Wyznaczono także wpływ zawartości tlenu na wydłużenie spawu i ostateczną wytrzymałość na rozciąganie. W badaniach doświadczalnych wykazano, że domieszki CaF2 oraz NiO są istotnymi czynnikami wpływającymi na wytrzymałość na rozciąganie, podczas gdy domieszka FeMn nie ma istotnego wpływu. Oceniono także wpływ współczynnika zasadowości topnika i równoważnika węglowego spawu na wydłużenie procentowe spawu.
Źródło:
Archive of Mechanical Engineering; 2016, LXIII, 3; 337-354
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extension of shelf-life of tomato using irradiated chitosan and its physical and biochemical characteristics
Autorzy:
Parvin, N.
Kader, M.A.
Huque, R.
Molla, M.E.
Khan, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/10996.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Źródło:
International Letters of Natural Sciences; 2018, 67
2300-9675
Pojawia się w:
International Letters of Natural Sciences
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
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