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    Wyświetlanie 1-12 z 12
    Tytuł:
    The strong 3-rainbow index of some certain graphs and its amalgamation
    Autorzy:
    Awanis, Zata Yumni
    Salman, A.N.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2216176.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    amalgamation
    rainbow coloring
    rainbow Steiner tree
    strong k-rainbow index
    Opis:
    We introduce a strong k-rainbow index of graphs as modification of well-known k-rainbow index of graphs. A tree in an edge-colored connected graph G, where adjacent edge may be colored the same, is a rainbow tree if all of its edges have distinct colors. Let k be an integer with 2 ≤ k ≤ n. The strong k-rainbow index of G, denoted by $srx_k(G)$, is the minimum number of colors needed in an edge-coloring of G so that every k vertices of G is connected by a rainbow tree with minimum size. We focus on k = 3. We determine the strong 3-rainbow index of some certain graphs. We also provide a sharp upper bound for the strong 3-rainbow index of amalgamation of graphs. Additionally, we determine the exact values of the strong 3-rainbow index of amalgamation of some graphs.
    Źródło:
    Opuscula Mathematica; 2022, 42, 4; 527-547
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Backbone colorings along stars and matchings in split graphs: their span is close to the chromatic number
    Autorzy:
    Broersma, Hajo
    Marchal, Bert
    Paulusma, Daniel
    Salman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/743123.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    backbone coloring
    split graph
    matching
    star
    Opis:
    We continue the study on backbone colorings, a variation on classical vertex colorings that was introduced at WG2003. Given a graph G = (V,E) and a spanning subgraph H of G (the backbone of G), a λ-backbone coloring for G and H is a proper vertex coloring V→ {1,2,...} of G in which the colors assigned to adjacent vertices in H differ by at least λ. The algorithmic and combinatorial properties of backbone colorings have been studied for various types of backbones in a number of papers. The main outcome of earlier studies is that the minimum number l of colors, for which such colorings V→ {1,2,...,l} exist, in the worst case is a factor times the chromatic number (for path, tree, matching and star backbones). We show here that for split graphs and matching or star backbones, l is at most a small additive constant (depending on λ) higher than the chromatic number. Our proofs combine algorithmic and combinatorial arguments. We also indicate other graph classes for which our results imply better upper bounds on l than the previously known bounds.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2009, 29, 1; 143-162
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Centrifugal compressor performance improvement through multi splitter impeller
    Autorzy:
    Malik, Adil
    Zheng, Qun
    Qureshi, Shafiq R.
    Ahmed, Salman A.
    Gambo, D. KB
    Powiązania:
    https://bibliotekanauki.pl/articles/258806.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    centrifugal compressor
    back swept impeller
    flow separation
    efficiency
    numerical simulation
    Opis:
    In the paper, a back swept impeller of centrifugal compressor is experimentally studied and numerically validated and modified to increase its pressure ratio and improve efficiency, as well as to analyse the effect of splitter blade location between two main blades. The back swept multi splitter blade impeller was designed with a big splitter positioned close to the main blade suction surface and a smaller splitter close to the pressure surface. Adding this multi splitter improves the overall performance of the modified impeller due to less intensive flow separation and smaller pressure loss. In particular, the total pressure ratio was observed to increase from 4.1 to 4.4, with one percent increase in efficiency.
    Źródło:
    Polish Maritime Research; 2019, 2; 6-14
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of travel behaviour in Petaling Jaya, Malaysia: an application of the theory of planned behaviour
    Autorzy:
    Madha, A.
    Salman, A. D.
    Hussain, H. D.
    Borhan, N.
    Riza Atiq, O. K. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/224282.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    public transport
    private car
    travellers
    Theory of Planned Behaviour
    TPB
    Structural Equation Modelling
    Petaling Jaya
    transport publiczny
    transport prywatny
    podróżni
    analiza zachowań
    Opis:
    In order to understand travellers’ willingness to use the train in Petaling Jaya, this study adds four predictors - situational factors, trust, novelty seeking and external influence - to the existing model of theory of planned behaviour (TPB). The study collected research data from employees in Petaling Jaya, Malaysia, resulting in valuable data of 400 participants. Results indicate that attitude, perceived behavioural control, and subjective norm are found to have positive effects on the behavioural intention of taking the train. Furthermore, novelty seeking and external influence also have positive influences on attitude. While the three antecedents of trust were found to have an indirect positive effect on commuters’ intention to take the train via attitude, subjective norm and PBC. Situational factors were found to have an indirect negative significant influence on people’s intention to take the train through perceived behavioural control.
    Źródło:
    Archives of Transport; 2016, 38, 2; 29-38
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Study of Some Electrical Properties of PVA-Ni(NO3)2 Composites
    Autorzy:
    Salman, S.A.
    Bakr, N. A.
    Mahmood, M.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/411873.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    polyvinyl alcohol
    Casting method
    Electrical properties
    Composites
    Opis:
    The aim of this paper is to prepare and study the (D.C.) electrical conductivity of (PVA-Ni(NO₃)₂) composites at different temperatures. For that purpose, PVA films with Ni(NO₃)₂ salt additive were prepared with different concentrations 2, 4, 6, 8 and 10 wt. % and with thickness of 45μm by using casting technique. The experimental results for PVA-Ni(NO₃)₂) films show that the (D.C.) electrical conductivity increased with increasing the filler content and the temperature, and the activation energy was decreased with increasing the filler content.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 40; 36-42
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Co Doping on Structural and Optical Properties of NiO Thin Films Prepared By Chemical Spray Pyrolysis Method
    Autorzy:
    Bakr, N. A.
    Salman, S. A.
    Shano, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412102.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    NiO thin films
    Co Doping
    Chemical Spray Pyrolysis
    Optical Properties
    Structural Properties
    Opis:
    In this work, nickel-cobalt oxide (Ni(1-x)CoxO) thin films, where x = 0, 4, 6 and 8 % have been successfully deposited on glass substrates by chemical spray pyrolysis (CSP) technique at substrate temperature of (400 °C) and thickness of about 300 nm. The structural and optical properties of these films have been studied using XRD, AFM, and UV-Visible spectroscopy. The XRD results showed that all films are polycrystalline in nature with cubic structure and preferred orientation along (111) plane. The crystallite size was calculated using Scherrer formula and it is found that the undoped NiO sample has maximum crystallite size (51.16 nm). AFM results showed homogenous and smooth thin films. The absorbance and transmittance spectra have been recorded in the wavelength range of (300-900) nm in order to study the optical properties. The optical energy gap for allowed direct electronic transition was calculated using Tauc equation. It is found that the band gap decreases as the Co-concentration increases and the band gap values were in the range of 3.58-3.66 eV and 3.58 eV for the prepared Nickel-Cobalt Oxide thin films. The Urbach energy increases as the Co-concentration increases and the Urbach. The optical constants including (absorption coefficient, real and imaginary parts of dielectric constant) were also calculated as a function of photon energy. Refractive index and extinction coefficient for Nickel- Cobalt Oxide thin films were estimated as a function of wavelength.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 41; 15-30
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Work-related musculoskeletal disorders among information technology professionals in Riyadh, Saudi Arabia
    Autorzy:
    Alghadir, Ahmad H.
    Khalid, Salman
    Iqbal, Zaheen A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2152945.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    occupational health
    IT professionals
    COVID-19
    Riyadh
    ergonomics
    desktop use
    Opis:
    Background This study was done to see the prevalence of work-related musculoskeletal disorders among information technology (IT) professionals in Saudi Arabia, the risk factors associated with them, their consequences, and to propose some preventive measures. Material and Methods A self-administered online questionnaire that included questions on the demographic data, job nature, medical history, work-related pain after joining information technology profession and distribution and severity of pain was sent to 250 information technology professionals working in Saudi Arabia. Results Out of 250, 202 (81%) IT professionals participated in the study. At least 62 (32%) reported that they have developed some type of musculoskeletal pain after joining their profession and 38 (61%) respondents further reported that it was so severe that they had to seek some sort of treatment for their pain. On the Visual Analog Scale ranging 0–10, 14 (23%) respondents reported that their worst ever pain was >7. Despite lower representation 67% of the females reported to develop work-related pain. Conclusions Development of work-related musculoskeletal pain among information technology professionals has been shown to affect their activities of daily living. It may even force them to change their work setting or reduce working hours. Information technology sector has rapidly grown in Saudi Arabia in the recent times and there is no data on the incidence or prevalence of such disorders among them. Role of ergonomics and counseling should be emphasized during their training that help them work effectively and efficiently. A similar large-scale study should be conducted to see the effect of lifestyle related to COVID-19 on the lives of working population especially IT professionals.
    Źródło:
    Medycyna Pracy; 2022, 73, 5; 397-406
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling Pollution Index Using Artificial Neural Network and Multiple Linear Regression Coupled with Genetic Algorithm
    Autorzy:
    Abdulkareem, Iman Ali
    Abbas, Abdulhussain A.
    Dawood, Ammar Salman
    Powiązania:
    https://bibliotekanauki.pl/articles/2068477.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    Shatt Al-Arab river
    comprehensive pollution index
    multiple linear regression
    artificial neural network
    genetic algorithm
    Opis:
    Shatt Al-Arab River in Basrah province, Iraq, was assessed by applying comprehensive pollution index (CPI) at fifteen sampling locations from 2011 to 2020, taking into consideration twelve physicochemical parameters which included pH, Tur., TDS, EC, TH, Na+, K+, Ca+2, Mg+2, Alk., SO4-2, and Cl-. The effectiveness of multiple linear regression (MLR) and artificial neural network (ANN) for predicting comprehensive pollution index was examined in this research. In order to determine the ideal values of the predictor parameters that lead to the lowest CPI value, the genetic algorithm coupled with multiple linear regression (GA-MLR) was used. A multi-layer feed-forward neural network with backpropagation algorithm was used in this study. The optimal ANN structure utilized in this research consisted of three layers: the input layer, one hidden layer, and one output layer. The predicted equation of the comprehensive pollution index was created using the regression technique and used as an objective function of the genetic algorithm. The minimum predicted comprehensive pollution index value recommended by the GA-MLR approach was 0.3777.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 3; 236--250
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission of Disaster Warnings via Control Channels in Cellular Networks
    Autorzy:
    Aal-Nouman, Mohammed I.
    Abdullah, Osamah
    Salman, Omar Hussein
    Al-Shaikhli, Noor Qusay A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839317.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    control channel
    disaster reduction
    early warning message
    mobile network
    Opis:
    According to United Nations reports, natural disasters caused, worldwide, approximately 100,000 deaths and affected 175 million people each year between 2004 and 2013. To reduce those numbers, countries around the globe have made specific arrangements enabling them to warn the population about imminent disasters, in order to evacuate the area in due time. But providing such warnings in areas where no Internet access is available poses a great challenge. In this paper, we proposed a method to transmit early warning messages via UMTS cellular networks, while relying on spare extensions of control channels (FACH). The results obtained are validate based on their comparison with theoretical considerations and are also benchmarked against the 3GPP standard. The results show that messages may be sent faster than with the use of the 3GPP standard.
    Źródło:
    Journal of Telecommunications and Information Technology; 2020, 4; 53-61
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of Primary Energy Mix, Electricity Production and Emissions from Power Sector in Ethiopia, Pakistan, Poland, Spain and Turkey
    Struktura pierwotnych źródeł miksu energetycznego, produkcji energii elektrycznej i emisji z sektora energetycznego w Etiopii, Pakistanie, Polsce, Hiszpanii i Turcji
    Autorzy:
    Bal, M.
    Ramos, C. A.
    Haile, E. G.
    Salman, H. M.
    Szejelewski, F.
    Bogacka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/357145.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Śląska
    Tematy:
    energy
    electricity
    emission
    energia
    elektryczność
    emisje
    Opis:
    In this article, a review of energy mix, electricity production and emissions from power sector of Ethiopia, Pakistan, Poland, Spain and Turkey is investigated. The choice of countries is varied to let see how it looks in different parts of the world. The time interval chosen to show some changes that follow. Primary energy consumption of the countries is given in percentage of resources used. Electricity production of the countries are analyzed in 2006 and 2011 respectively. Furthermore, emissions of CO2, NOx SOx and PM are compared with respect to population and area and GDP. As a result, the analysis of the highest and lowest emitting countries are presented in the article.
    W artykule przedstawiono przegląd źródeł miksu energetycznego, produkcji energii elektrycznej i emisji z sektora energetycznego w Etiopii, Pakistanie, Polsce, Hiszpanii i Turcji. Wybór krajów jest zróżnicowany aby przybliżyć jak wygląda to w różnych częściach świata. Przedział czasu dobrano tak, aby pokazać pewne zmiany, które następują. Zużycie energii pierwotnej krajów podane jest w procentach zasobów używanych. Produkcja energii elektrycznej z wymienionych krajów jest analizowana odpowiednio dla danych z roku 2006 i 2011. Ponadto, emisje CO2, NOx SOx i PM są porównywane pod względem ludności , powierzchni i produktu krajowego brutto - PKB. W rezultacie, przedstawiono analizę najbardziej i najmniej uciążliwych pod względem emisji krajów porównywanych.
    Źródło:
    Archiwum Gospodarki Odpadami i Ochrony Środowiska; 2014, 16, 2; 93-106
    1733-4381
    Pojawia się w:
    Archiwum Gospodarki Odpadami i Ochrony Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Characterization of Turbot (Psetta Maxima) Originated Natural Hydroxyapatite
    Autorzy:
    Inan, A.
    Komur, B.
    Ekren, N.
    Aydogdu, M.
    Gokce, H.
    Ficai, A.
    Salman, S.
    Oktar, F.
    Gunduz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031973.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    81.05.Mh
    87.85.J
    Opis:
    Nowadays hydroxyapatite is one of the most popular biomaterials, which is used in various medical and dental applications areas as graft material. Bovine bone is the biggest source for natural hydroxyapatite production, but its production can lead to very dangerous disease, like mad cow disease, without high degree calcination. Hydroxyapatite produced from marine sources is much safer and easier to produce than bovine hydroxyapatite. Here in this study natural hydroxyapatite and related phases were produced from a local source turbot (Psetta maxima). Beside the main bony internal structure, there are koshers (cycloid scale) on its skin. Koshers are bulky bumps, looking like flat, small and rounded structures. Internal bones and those bulky bumps were cleaned from flesh with chemicals and calcined at 850°C for 4 hours. After calcinations, especially those bulky bumps, were formed into mesoporous structures with very light bluish color. Those mesoporous structures can be used as natural mesoporous hydroxyapatite structures for bone grafting purposes. The internal bones have also formed hydroxyapatite. Scanning electron microscope and X-ray diffraction studies were performed. I this study it is found that the bones of turbot consist of hydroxyapatite and TCP related phases. The aim of this study is to produce natural hydroxyapatite structures from turbot scale with low carbon footprint, without harming the environment and without using complex chemicals.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 397-399
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydroxyapatite Synthesis from Fish Bones: Atlantic Salmon (Salmon Salar)
    Autorzy:
    Komur, B.
    Altun, E.
    Aydogdu, M.
    Bilgiç, D.
    Gokce, H.
    Ekren, N.
    Salman, S.
    Inan, A.
    Oktar, F.
    Gunduz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032056.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jj
    81.05.-t
    Opis:
    Production of the bioceramics on the market is presently conducted from typical precipitation method by using reagent grade raw chemicals or through calcination of natural sources like animal bones (especially bovine bone) and fish bones. Usually fish bones were damped near or in the water sources, which can lead to serious environmental pollution. Those were regarded as a trash, even though they still bear economic value, including conjugates. In this study bones of Atlantic Salmon (Salmo salar) were used as a bioceramic material source. Bones of Atlantic Salmon were collected from Besiktas Fish Market. Those were cleaned from possible flesh with reagent grade NaOH. Cleaned parts were washed with demineralized water very neatly. Dry fish bones were calcinated at 850°C for 4 hours. The obtained hydroxyapatite material was characterized with scanning electron microscopy and X-ray diffraction methods. It was found that the bioceramic material consisted of hydroxyapatite and various related phases. Scanning electron microscopy studies have revealed nano-structured bioceramic particles. The aim of this study is to obtain nano-structured bioceramics from bones of Atlantic Salmon in an environmentally friendly and economic way.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 400-402
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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