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Wyświetlanie 1-15 z 78
Tytuł:
An analysis of the impact of PV farms on airport operation
Autorzy:
Mroziński, Adam
Walichnowska, Patrycja
Idzikowski, Adam
Al-Zubiedy, Ali
Fahad, Raid Salman
Powiązania:
https://bibliotekanauki.pl/articles/31342523.pdf
Data publikacji:
2023
Wydawca:
Politechnika Częstochowska
Tematy:
photovoltaic farm
PV installations on airports
PV farm impact
farma fotowoltaiczna
farma PV
instalacje PV
lotniska
Opis:
Large PV installations are being built increasingly often in areas close to airports in Poland and around the world. These are not only roof installations but also large PV farms, allowing not only the supply of the energy for the airport itself but also the ability to sell the excess energy produced. The applied PV installations may cause in some cases negative impact in the form of e.g., electromagnetic fields and light reflections which may limit the visibility of pilots and air traffic controllers. The article presents an overview of various negative impacts of PV farms on the workings of an airport and the main factors influencing the occurrence of certain threats have been diagnosed. An assessment of the usefulness of the tool and method for simulation and the reduction of possible negative impacts is also presented.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2023, 12; 7-16
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An updated earthquake catalog for Bangladesh: an attempt at a seismic risk evaluation
Autorzy:
Salman, Md Abdullah
Nomaan, Md Saleh Shakeel
Saha, Ayon
Powiązania:
https://bibliotekanauki.pl/articles/2202860.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
earthquake catalog
seismic hazard
magnitude
deformation front
Opis:
A unique, consistent, and uniform earthquake catalog is crucial for assessing seismic hazards in any locality. This study aims at compiling and processing a better uniform earthquake catalog, using this catalog to identify the probable subduction zone, and assessing seismicity parameters for Bangladesh. The study area is bounded by the geographical limits 16–29°N and 86–96°E. It includes a sum of 48,342 events which are compiled as 1.0 to 8.5 magnitudes (MW) and time period from 1548 to 2020 yrs. Uniformization is made between the body, surface wave, and moment magnitude scales to unify the catalog in terms of MW. For seismic hazard assessment or prediction studies, this catalog comprises earthquake events from Bangladesh and adjoining regions. The assessed MC obtained is around 4.0–5.0, which leads to a, b value varying between 0.71–1.12 and an a value varying between 4.85–7.12. The findings show that the MC is lower at the border of the Chittagong-Sylhet through Hill tracts than the northern part of the area with an MC 4.5–5.0 and a, b value close to 1.00. The results indicate that the study area is a seismically highly active zone in the context of seismicity parameters. Finally, the compiled catalog, seismicity of the area and a probable deformation front are presented and are recommended for use in assessing seismic hazard analysis in Bangladesh.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 1; 37--51
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromium Ions Removal by Capacitive Deionization Process: Optimization of the Operating Parameters with Response Surface Methodology
Autorzy:
Issa, Zainab M.
Salman, Rasha H.
Powiązania:
https://bibliotekanauki.pl/articles/2202352.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
capacitive deionization
electrosorption
carbon fibre
chromium
wastewater
Opis:
An innovative desalination method called electrosorption or capacitive deionization (CDI) has significant benefits for wastewater treatment. This process is performed by using a carbon fiber electrode as a working electrode to remove hexavalent chromium ions from an aqueous solution. The pH, NaCl concentration, and cell voltage were optimized using the Box-Behnken experimental design (BDD) in response surface methodology (RSM) to study the effects and interactions of selected variables. To attain the relationship between the process variables and chromium removal, the experimental data were subjected to an analysis of variance and fitted with a quadratic model. The optimum conditions to remove Cr(VI) ions were: pH of 2, a cell voltage of 4.3V, and NaCl concentration of 1.4 g/L. This study demonstrated that the carbon fiber electrode was very efficient in Cr(VI) ions removal and the BBD methodology was a practical and effective strategy for predicting the results of various experimental conditions during a CDI process for the removal of chromium ions.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 51--65
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hardness, corrosion behavior, and microstructure of Al-Cu-Mg alloy as a function of 0.3 wt.% Zr addition
Autorzy:
Saad, Karrar
Al-Murshdy, Jassim M. Salman
Powiązania:
https://bibliotekanauki.pl/articles/2174477.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
Al-alloy
effect of alloying element addition
Brinell hardness
current density
recrystallization
stop aluminium
twardość Brinella
gęstość prądu
rekrystalizacja
Opis:
The effect of adding zirconium (Zr) as an alloying element to Al-Cu-Mg alloy on the hardness and corrosion of this alloy was investigated. The hardness and polarization test results of samples treated for various periods by aging at 423.15 K for 3hr showed a significant increment in the Brinell hardness (HBW) improvement ratio of 115.6% (from 45HBW to 97HBW) and an extreme reduction the corrosion rate of the alloy after Zr adding decrease in the current density by 79.42% (from 56.50 µA cm-2 to 11.63 µA cm-2) with aging for 3 hr compared to the base alloy. The impact of this addition is also reflected in the strengthening, recrystallization, and modification of the grain microstructure. These changes were clearly demonstrated by microscopic testing and proves that the addition of Zr has a considerable synergistic effect causing inhibition of recrystallization and refinement of grain size.
Źródło:
Diagnostyka; 2023, 24, 1; art. no. 2023104
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is Globalization Driving the Use of Renewable Energy? A Global Macro Perspective
Czy globalizacja sprzyja rozwojowi energii odnawialnej? Globalna makro-perspektywa
Autorzy:
Salman, Verda
Ahmad, Imtiaz
Alvi, Shahzad
Powiązania:
https://bibliotekanauki.pl/articles/27314019.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:
globalization
renewable energy
government effectiveness
GDP per capita
CO2
globalizacja
energia odnawialna
skuteczność rządu
PKB per capita
Opis:
The contemporary world has become increasingly interdependent in terms of economic, social and political development. These various forms of interdependence, usually termed globalization, help disseminate ideas, information, products, and services around the world. Increase in globalization has also increased path-dependence, affecting economic, social, and institutional development and completing some industries, products and technologies to grow in line with the global demand and changing standards. While the role of globalization in economic growth, technology transfer and institutional development is established in literature, the role of globalization in reversing environmental deterioration is not explored yet. The current study looks at how globalization has affected renewable energy use in high, upper middle and lower middle income countries. The empirical results based on a fixed effects model show that countries differ in terms of taking advantage of different types of globalization, i.e., economic, social and political, while transitioning towards renewable energy (RE) projects. Economic globalization has a positive influence on RE usage in the case of high and lower middle income countries, Social globalization in case of high and upper middle income countries. Contrary to the positive impacts of economic and social globalization, political globalization has a negative impact on RE usage in the case of high income countries. In addition to globalization, the effect of government effectiveness, GDP per capita and CO2 vary across the groups of countries.
Współczesny świat staje się coraz bardziej współzależny pod względem rozwoju gospodarczego, społecznego i politycznego. Te różne formy współzależności, zwykle nazywane globalizacją, pomagają rozpowszechniać idee, informacje, produkty i usługi na całym świecie. Wzrost globalizacji zwiększył również inne współzależności, wpływając na rozwój gospodarczy, społeczny i instytucjonalny oraz ukończenie niektórych gałęzi przemysłu, produktów i technologii, tak aby rozwijały się zgodnie z globalnym popytem i zmieniającymi się standardami. Chociaż rola globalizacji we wzroście gospodarczym, transferze technologii i rozwoju instytucjonalnym jest ustalona w literaturze, rola globalizacji w odwracaniu degradacji środowiska nie jest jeszcze zbadana. Obecne badanie dotyczy wpływu globalizacji na wykorzystanie energii odnawialnej w krajach o wysokim, średnim i niskim średnim dochodzie. Wyniki empiryczne oparte na modelu efektów stałych pokazują, że kraje różnią się pod względem wykorzystania różnych rodzajów globalizacji, tj. gospodarczej, społecznej i politycznej, podczas przechodzenia na projekty związane z energią odnawialną (OZE). Globalizacja gospodarcza ma pozytywny wpływ na wykorzystanie OZE w przypadku krajów o wysokim i niskim średnim dochodzie, Globalizacja społeczna w przypadku krajów o wysokim i wyższym średnim dochodzie. W przeciwieństwie do pozytywnych skutków globalizacji gospodarczej i społecznej, globalizacja polityczna ma negatywny wpływ na wykorzystanie OZE w przypadku krajów o wysokich dochodach. Oprócz globalizacji wpływ skuteczności rządów, PKB na mieszkańca i CO2 jest różny w poszczególnych grupach krajów.
Źródło:
Problemy Ekorozwoju; 2023, 18, 1; 68--80
1895-6912
Pojawia się w:
Problemy Ekorozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory tests of solid and hollow concrete beams made with glass waste
Autorzy:
Alharishawi, Salam Salman Chiad
Rajaa, Nagham
Jabur, Aqeel Raheem
Powiązania:
https://bibliotekanauki.pl/articles/27322547.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Opis:
The application of used glazed waste in concrete production can improve the performance of the structure of the building. Flexural and shear behavior and action of reinforced Hollow Glass Concrete Beams (HGCB) and Solid Glass Concrete Beams (SGCB) made with glass waste under a two-point load are studied in this paper. In this work, 6 reinforced concrete solid and hollow beams were tested under a four-point bending test to evaluate and calculate the flexural behavior of SGCB and HGCB. For that purpose, Beams were prepared with 1000 mm length, 230 mm height, and 120 mm. All beams were divided into groups and named according to the space stirrups steel bar. The experimental work investigates five main variables which are: first: the comparison between SGCB and HGCB with the concrete beams made with glass waste (Glass Concrete Beam GCB), second: comparison between Solid Concrete Beams for Normal Concrete Beams (NCB), and GCB, three: comparison between Hollow Concrete Beams for NCB and GCB, four: the comparison between HGCB and HCB, last: the comparison between SGCB and SCB. The test results indicated that GCB was offered higher strength than NCB, but the load-slip behavior of all specimens is similar for both types of concretes, and the bond strength is not influenced by steel specimens. Furthermore, the results of this study indicated that the contribution of GCB to the load is indicated to be considerable. The results indicate that the hollow opening affected the ultimate load capacity and deflection of HGCB.
Źródło:
Archives of Civil Engineering; 2023, 69, 4; 5--20
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Nanomaterial Type on Water Disinfection Using Data Mining
Autorzy:
Hamdan, Mohammad
Khalil, Rana Haj
Abdelhafez, Eman
Ajib, Salman
Powiązania:
https://bibliotekanauki.pl/articles/24201710.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water disinfection
artificial neural network
nanotechnology
data mining
Opis:
Multiple linear regression and artificial neural network (ANN) models were utilized in this study to assess the type influence of nanomaterials on polluted water disinfection. This was accomplished by estimating E. coli (E.C) and the total coliform (TC) concentrations in contaminated water while nanoparticles were added at various concentrations as input variables, together with water temperature, PH, and turbidity. To achieve this objective, two approaches were implemented: data mining with two types of artificial neural networks (MLP and RBF), and multiple linear regression models (MLR). The simulation was conducted using SPSS software. Data mining was revealed after the estimated findings were checked against the measured data. It was found that MLP was the most promising model in the prediction of the TC and E.C concentration, s followed by the RBF and MLR models, respectively.
Źródło:
Journal of Ecological Engineering; 2023, 24, 4; 244--251
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of Desulfurized Heavy Liquid Fuel Blends in Domestic Boiler
Autorzy:
Al Aboushi, Ahmad
Abdelhafez, Eman
Hamdan, Mohammad
Ajib, Salman
Alsaqoor, Sameh
Powiązania:
https://bibliotekanauki.pl/articles/27323821.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
shale oil
domestic boiler
activated carbon
diesel
sulfur oxide
Opis:
One way to cut down the consumption of diesel fuel in domestic heating in Jordan is to blend it with shale oil, which may be extracted from oil shale. This leads to a cut down in the national fuel bill in Jordan. Unfortunately, shale oil contains significant amounts of sulfur as impurities and upon burning sulfur oxides are emitted causing a negative environmental impact, and hence desulfurization of such fuel blends is essential. This may be achieved by adding activated carbon to the fluids. The process of removing sulfur from shale oil is crucial for safeguarding the environment, human well-being, and equipment, as well as meeting regulatory requirements and creating superior-quality goods. In this study, a domestic boiler was utilized to evaluate the degree of desulfurization process of blends of diesel and shale oil fuels upon their burning in a domestic boiler, to achieve this, blends of both fuels were prepared with varying amounts of shale oil (10%, 20%, 30%, and 40%) and various amounts of activated carbon were added to the prepared mixtures of diesel fuel and shale oil. The assessment of performance included examining the environmental impact, specifically by analyzing exhaust gases to measure the concentration of Sulfur Oxide (SO2). It was found that an increase in the concentration of shale oil in the mixture led to an increase in the concentration of SO2. However, adding more activated carbon to the mixture from the fuels resulted in a decrease in the SO2 concentration. The lowest SO2 concentration was observed when 1g of activated carbon was added per liter of the fuel mixture at a 20% concentration of shale oil, and 0.6g of activated carbon per liter of the fuel mixture at a 40% concentration of oil shale.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 225--233
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cochlear Implantation in Children with Congenital Inner Ear Malformations
Autorzy:
Abbas, Azzam Muhsin
Hamed, Mustafa Salman
Ahmed, Ahmed Salah
Powiązania:
https://bibliotekanauki.pl/articles/27317603.pdf
Data publikacji:
2022-12-15
Wydawca:
Index Copernicus International
Tematy:
cochlear implantation
congenital inner ear malformation
facial nerve anomalies
Opis:
Introduction: Cochlear Implantation has proven beneficial in patients with profound congenital hearing impairments. Performing cochlear implantation in patients with inner ear malformation has always been a matter of dispute as congenitally deaf ears may have anatomical malformations and thus meet difficulties during operation. Therefore, it is important to focus on problems and complications encountered by surgeons performing such operations. Aim: To evaluate problems and surgical difficulties encountered in patients with congenital inner ear malformation, who underwent cochlear implantation. Material and methods: A series of 21 pediatric cochlear implant (CI) patients with known inner ear malformations determined on computed tomography (CT) of the temporal bone who underwent cochlear implantation in the Department of Otolaryngology of Martyr Ghazi Al-Hariri and AL-Yarmouk Teaching Hospital, Baghdad, Iraq, from January 2018 to January 2021. The study aimed to determine intraoperative adverse effects of these anomalies regarding electrode array insertion depths, predisposition to cerebrospinal fluid (CSF) leak through the cochleostomy, and associated facial nerve anomalies that can create problems with access to scala tympani. Results: The most common inner ear anomalies were wide vestibular aqueduct (15 patients, which makes 71.4%), incomplete partitions (5 patients, 23.8%), and common cavity (1 patient, 4.8%). As concerns CSF leak, the most common was CSF ooze (11 patients, 52.4%), CSF gusher (6 patients, 28.6%), and no CSF leak (4 patients, 19%). Among facial nerve anomalies there was only one case (4.8%) of abnormal position (more superficial and not injured) and 20 cases (95.2%) in which no anomaly was detected. As concerns electrode insertion depth, full insertion was achieved in 17 patients (81%), while incomplete insertion in 4 patients (19%). Conclusion: Cochlear implant can be successfully and safely inserted in patients with selected congenital inner ear anomalies. Surgery can be challenging in certain cases of gusher and facial nerve abnormalities, but proper radiology and good surgical technique will help avoid complications.
Źródło:
Polski Przegląd Otorynolaryngologiczny; 2022, 11, 4; 1-12
2084-5308
2300-7338
Pojawia się w:
Polski Przegląd Otorynolaryngologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
David B. Ottaway, Mohammed bin Salman: the Icarus of Saudi Arabia?, Lynne Rienner Publishers, Boulder-London 2021, 232 ss.
Autorzy:
Pietrasik, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/22444321.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Źródło:
Polityka i Społeczeństwo; 2022, 20, 2; 245-250
1732-9639
Pojawia się w:
Polityka i Społeczeństwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geological appraisal of the Theban cliff overhanging the Hatshepsut temple at Deir el-Bahari
Autorzy:
Chudzik, Patryk
El Younsy, Ahmed-Reda M
Galal, Wael F
Salman, Abdelhamid M
Powiązania:
https://bibliotekanauki.pl/articles/2033230.pdf
Data publikacji:
2022-01-01
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
Theban Limestone cliff
Esna Shale
Temple of Hatshepsut
Deir el-Bahari
geological research
swelling rate
Opis:
Throughout its existence the Temple of Hatshepsut, as well as two other royal sanctuaries, the temples of Mentuhotep II and Thutmose III, located in the great bay of Deir el-Bahari, have been under constant threat of falling rocks from the overhanging Theban cliff. The PCMA UW archaeological expedition at Deir el-Bahari, which has progressed with the study and conservation of the Hatshepsut temple since the 1960s, has implemented a project designed to address the issue of the protection of the temple from damages that could be caused by environmental processes (rainwater and seismic activity) affecting the Theban cliff behind the monument. In a geological survey of the fractured limestone cliff, the evidence from 31 observation stations was appraised and samples of Esna Shale and Theban Limestone were examined in order to ascertain the degree of the cliff’s instability and fragility. The results were used to prepare a 2D model presenting the environmental processes threatening the ancient substance.
Źródło:
Polish Archaeology in the Mediterranean; 2021, 30(1); 275-295
1234-5415
Pojawia się w:
Polish Archaeology in the Mediterranean
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:
Mohammed Bin Salman’s Rising to Power. Chances for Transition in Saudi Arabia?
Przejęcie władzy przez następcę tronu Mohammada Bin Salmana. Szanse na zmiany w Arabii Saudyjskiej?
Autorzy:
Ożarowski, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/30147211.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Saudi Arabia
House of Saud
succession
economic transition
Arabia Saudyjska
sukcesja
przemiany ekonomiczne
Saudowie
Opis:
The aim of this paper is to present the outline of planned and already implemented social, political and economic changes in the context of gradual transition of power in the Kingdom of Saudi Arabia. The main thesis put in this paper relates to Mohammed bin Salman’s leading project – “Vision 2030” which assumed gradual multi-dimensional transition in Saudi Arabia. Many of changes implemented already, including the limitation of clergy’s activity will not bring about quick social-political transition due to long-lasting and deeply rooted alliance between Saudi ruling clan and radical movement of Wahhabis, that determines conservative regime in the country. Basing on the main thesis Author tries to give the answer to research questions correlated with the thesis and touching the issue of possibility for implementation political, economic changes in Saudi Arabia by Mohammed bin Salman. In the paper following research methods has been applied: historical method, which refers to analysis of historical process of shaping and development Saudi monarchy; documentary analysis - relating to governmental project “Vision 2030” particularly; elements of systemic approach in which system is constituted by political regime of Saudi Arabia; elements of statistical method employed in the context of variable economic or social data and elements of predictive referring to the model of Saudi Arabia’s development under the rule of Mohammed bin Salman.
Celem artykułu jest przestawienie zarysu planowanych i wprowadzonych już zmian społecznych, politycznych i gospodarczych w Arabii Saudyjskiej w kontekście generacyjnej zmiany władzy. Główna hipoteza jest ściśle powiązana z flagowym projektem zmian pod tytułem „Wizja 2030” i bezpośrednio dotyczy następcy tronu Mohammeda bin Salmana, który stoi za tym przedsięwzięciem. Wiele zmian w różnych sferach życia społecznego, gospodarczego i także politycznego zostało już wprowadzonych, w tym m.in. ograniczenie roli duchowieństwa i instytucji religijnych takich jak Mutaween. Należy przy tum zaznaczyć, że daleko idące przemiany polityczno-religijne wymagają długiej perspektywy czasowej, choćby z uwagi na ist niejący już od 250 lat układ polityczny pomiędzy klanem rodowym Saudów a religijnymi fundamentalistami Wahhabitami. Powiązanie wahhabicko-saudyjskie determinuje konserwatywny ustrój państwa i może być główną przeszkodą w planowanej jego modernizacji. Do hipotezy badawczej postawiono kilka pytań badawczych związanych z szansami implementacji planowanych zmian w sferze gospodarczo-społecznej i tym samym politycznej w Arabii Saudyjskiej. W tekście wykorzystano następujące metody badawcze: metoda genetyczna, która odnosi się do procesu historycznego kształtowania państwowości Arabii Saudyjskiej; analiza źródłowa dokumentów, w szczególności odnosząca się do flagowego dokumentu „Wizja 2030”. Wykorzystano również elementy metody systemowej, w ramach której określonym systemem jest ustrój polityczny Arabii Saudyjskiej oraz skorzystano z elementów metody statystycznej w zakresie posługiwania się danymi liczbowymi w odniesieniu do zjawisk ekonomicznych i społecznych. W tekście zastosowano również elementy metody predyktywnej w odniesieniu do prognozy dalszego rozwoju zmian wdrażanych przez następcę tronu Arabii Saudyjskiej.
Źródło:
Przegląd Strategiczny; 2022, 15; 157-168
2084-6991
Pojawia się w:
Przegląd Strategiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
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
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