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Wyświetlanie 1-15 z 26
Tytuł:
Cyclability in bipartite graphs
Autorzy:
Amar, D.
Flandrin, E.
Gancarzewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/255877.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
graphs
cycles
bipartite graphs
Opis:
Let G = (X, Y; E) be a balanced 2-connected bipartite graph and S ⊂ V(G). We will say that S is cyclable in G if all vertices of S belong to a common cycle in G. We give sufficient degree conditions in a balanced bipartite graph G and a subset S ⊂ V(G) for the cyclability of the set S.
Źródło:
Opuscula Mathematica; 2009, 29, 4; 345-364
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Universal divisors in Hardy spaces
Autorzy:
Amar, E.
Menini, C.
Powiązania:
https://bibliotekanauki.pl/articles/1205814.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
We study a division problem in the Hardy classes $H^{p}()$ of the unit ball of $ℂ^{2}$ which generalizes the $H^{p}$ corona problem, the generators being allowed to have common zeros. MPrecisely, if S is a subset of , we study conditions on a $ℂ^{k}$-valued bounded Mholomorphic function B, with $B_{|S} = 0$, in order that for 1 ≤ p < ∞ and any function $f ∈ H^{p}()$ with $f_{|S} = 0$ there is a $ℂ^{k}$-valued $H^{p}()$ holomorphic function F with f = B·F, i.e. the module generated by the components of B in the Hardy class $H^{p}()$ is the entire module $M_{S}:= {f ∈ H^{p}(): f_{|S} = 0 }$. As a special case, for S = ∅, we get the $H^{p}$ corona theorem.
Źródło:
Studia Mathematica; 2000, 143, 1; 1-21
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of sand p–y curves by predicting both monopile lateral response and OWT natural frequency
Autorzy:
Amel, Douifi
Djillali, Amar Bouzid
Subhamoy, Bhattacharya
Nasreddine, Amoura
Powiązania:
https://bibliotekanauki.pl/articles/2073761.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
FE analysis
p–y curve
Winkler model
cohesionless soil
monopile
offshore wind turbine
natural frequency
soil–monopile stiffness
Opis:
Extending the use of the p–y curves included in the regulation codes API and DNV to design large-diameter monopiles supporting offshore wind turbines (OWTs) was unsuccessful as it resulted in an inaccurate estimation of the monopile behavior. This had prompted many investigators to propose formulations to enhance the performances of Winkler model. In this paper, two case studies are considered. A case consisting of an OWT at Horns Rev (Denmark) supported by a monopile in a sandy soil was studied first. Taking the FEA using ABAQUS as reference, results of WILDOWER 1.0 (a Winkler computer code) using the recently proposed p–y curves giving design parameters were plotted and evaluated. In order to see the ability of proposed p–y curves to predict the monopile head movements, and consequently the first natural frequency (1st NF), a second case study consisting of a monopile supporting an OWT at North Hoyle (UK) was selected. The monopile head stiffness in terms of lateral, rocking, and cross-coupling stiffness coefficients, necessary for the 1st NF, were computed using both ABAQUS and WILDPOWER 1.0. Comparisons with the measured 1st NF showed that with the exception of one p–y model, none of other proposed Winkler methods is able to predict accurately this parameter.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 1; 66--81
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of cavitation inside mini - sac Diesel injector nozzle using computational fluid dynamics
Autorzy:
Bansode, Vaibhav
Verma, Munna
Pandhare, Amar
Shinde, Sandip
Powiązania:
https://bibliotekanauki.pl/articles/2106439.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
cavitations
mini-sac diesel injector nozzle
needle lift
parametric study
CFD
kawitacja
badania parametryczne
Opis:
computational fluid dynamics The performance of the internal flow of the fuel injector is impeded by several factors. The nozzle is one of the factors, being typically about a millimeter long and a fraction of a millimeter in diameter. Cavitation inside the diesel injector nozzle is associated with local pressure distribution. At flow areas with sharp corners, the pressure may locally drop below vapour pressure. The aim of this study is to assess the impact of turbulence and cavitation models on the prediction of flow in diesel injection nozzle. In the present study, an analysis of an existing 6 hole mini-sac diesel injector nozzle is carried out using a CFD package. The main objective of the research is to design a nozzle to avoid cavitation and to find out the contribution of different parameters through parametric study. Cavitation is a complex phenomenon whose appearance depends on the physical as well as flow properties of the flowing substance. Thus, for a better visualization of cavitation, a 3D CFD simulation of mini-sac injector nozzle is carried out. An analysis of a single nozzle hole of a mini-sac diesel injector nozzle is considered for the analysis, as the flow is uniformly distributed through each nozzle. As the three-dimensional geometry of mini-sac nozzle is complicated, therefore tet/hybrid element with T-Grid meshing scheme is used, for good surface meshing. The analysis is carried out at injection pressure of 5 00 bar. The CFDresults are validated against test data with the maximum deviation for the mass flow rate of 8.67% at full needle lift.
Źródło:
Journal of Mechanical and Energy Engineering; 2022, 6, 1; 7--12
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Restoration image degraded by a blurred variable in the field
Autorzy:
Bentahar, Y.
Afifi, M.
Dalimi, H.
Amar, S.
Powiązania:
https://bibliotekanauki.pl/articles/174974.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
blind image deconvolution
restoration
total variation
Opis:
Various methods of deconvolution have been developed for several decades, notably in astronomy and microscopy. The extension of these techniques to the case of a spatially varied blur is currently an open problem. In this work, we consider a zone-invariant point spread function model to take into account blur variation in the image. Thus an algorithm has been used where the minimization of the criterion is performed in parallel on different areas of the image, while taking into account the estimates in the neighboring areas of the sub-images under consideration, so that the final solution is the minimum of the criterion where the blur is spatially varied.
Źródło:
Optica Applicata; 2018, 48, 1; 5-14
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards a sustainable transport in Algeria: the requisite of energy transition in the road transport sector
Autorzy:
Chetta, Saif Eddine
Nait, Amar Nadra
Powiązania:
https://bibliotekanauki.pl/articles/2091215.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
energy transition
road transport
environment
public health
economy
sustainable transport
transformacja energetyczna
transport drogowy
środowisko
zdrowie publiczne
gospodarka
transport zrównoważony
Opis:
Less than ten years ago, Algeria embarked on an energy transition with the objectives of sustainable development. Although it concerns all economic sectors, efforts made in the field of road transport, as the main polluter and energy consumer at the national level, are far from being sufficient despite its inclusion in policy statements. This sector is operational exclusively on fossil and exhaustible energies whereas its atmospheric pollutants and gaseous emissions are highly harmful to the environment, public health and the economy. Thus, this paper points out the emergency of an energy transition in the road transport sector to clean and renewable energy as a necessity rather than a choice. It highlights, first, the characteristics of the Algerian automobile fleet and its various impacts and damages on the environment, public health and the economy. Furthermore, it evaluates the various policy initiatives towards sustainable transport and their deficiencies. Hence, the right attitudes and regulatory instruments towards sustainable transport in Algeria are recommended.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 112; 33--49
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE INFLUENCE OF PLASTICIZER IN NAIL LACQUER FORMULATIONS ON FLUCONAZOLE PERMEABILITY THROUGH THE BOVINE HOOF MEMBRANE
Autorzy:
Elezovic, Alisa
Elezović, Amar
Hadziabdic, Jasmina
Powiązania:
https://bibliotekanauki.pl/articles/895713.pdf
Data publikacji:
2020-02-29
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
plasticizer
fluconazole
nail lacquer
in vitro permeability
bovine hoof membrane
Opis:
Medicinal nail lacquers are the most effective topical treatment of nail diseases. These formulations generally are organic solutions of the active substance as well as film-forming polymer and plasticizer, which affects the characteristics of the film formed after application and solvent evaporation. The aim of this work was to test effects of plasticizer present in nail lacquer formulations on permeation kinetics of fluconazole through the bovine hoof membrane in a novel in vitro test. The formulations contained Eudragit RS100 dissolved in acetone, and dibutyl-phthalate, PEG 400 or propylene glycol as plasticizers present in two different concentrations. Permeation studies were carried out during 7-day period, and the obtained permeability profiles analyzed using similarity and difference factors, and by model dependent permeation kinetics. When analyzed within the same strength, the highest extent of fluconazole permeation was obtained from formulation with lower concentration of propylene glycol at 0.9% fluconazole concentration, while for formulations with 1.8% and 2.7% of fluconazole, the highest permeation was achieved from formulation with the higher content of PEG400. The permeation profiles showed greater difference within one formulation of different fluconazole content, than with the same plasticizer present in different concentrations, when using dibutyl-phthalate and PEG400. Permeation profiles were similar when using propylene glycol. When comparing formulations with the same concentration of plasticizers, there were differences in formulations with the higher fluconazole concentrations. Permeation kinetics depended on fluconazole concentration as well as the path length the active substance had to pass to reach the receptor solution.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 1; 43-56
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Zeolite and Activated Carbon Thickness Variation as Adsorbent Media in Reducing Phenol and Manganese Levels in Wastewater of Non-Destructive Testing Unit
Autorzy:
Fikri, Elanda
Farid, Reta Athaya Mutiara
Septiati, Yosephina Ardiani
Djuhriah, Nanny
Hanurawaty, Neneng Yetty
Khair, Amar Sharaf Eldin
Powiązania:
https://bibliotekanauki.pl/articles/2173279.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
NDT wastewater
non-destructive testing wastewater
adsorption
zeolite
activated carbon
phenol
manganese
Opis:
The production wastewater contains phenol from the Non-Destructive Testing (NDT) unit because it uses solvents; meanwhile, the manganese originates from the metal material washing process. On the basis of laboratory test results, the wastewater originating from the NDT unit of Y Industry, resulted in a phenol level of 2.33 mg/L, exceeding the quality standard of 0.5 mg/L and manganese level of 14.13 mg/L that exceeded the quality standard of 2 mg/L, based on the Regulation of the Minister of the Environment Number 5 of 2014 concerning Wastewater Quality Standards. This research used the pretest-posttest experimental research design without control. The sample in this study was wastewater from the NDT unit of the Y Industry. The average phenol level after passing through the adsorbent media at a thickness of 40 cm, 60 cm, and 80 cm resulted in 0.99 mg/L with 63% reduction, 0.60 mg/L with 77% reduction, and 0,28 mg/L with 89% reduction, respectively. The average manganese level after passing through the adsorbent media at a thickness of 40 cm, 60 cm, and 80 cm resulted in 0.10 mg/L with 61% reduction, 0.06 mg/L with 76% reduction, and 0,05 mg/L with 80% reduction, respectively. The most effective thickness variation in reducing the phenol and manganese levels of NDT wastewater is 80 cm thickness.
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 40--48
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effectiveness of Melt-Blown Filter Cartridge and UV-C Rays on the Reduction of Total Coliform and Water Hardness in Production Process Water
Autorzy:
Fikri, Elanda
Putri, Nursyifa Yuliani
Djuhriah, Nanny
Hanurawaty, Neneng Yetty
Khair, Amar Sharaf Eldin
Powiązania:
https://bibliotekanauki.pl/articles/2086408.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
melt blown
filter cartridge
ultraviolet C
UVC
total coliform
water hardness
Opis:
Water is one of the humans’ basic needs that are essential in daily lives. The water use related to the production of the food processing industry must at least meet the quality standards required for drinking water. The Production process water is obtained from the artesian well that has been treated with a physical treatment process. The microbiological examination result of total Coliform is 8.6 MPN/100 ml meaning that it does not meet the quality standard requirements, which is 0 MPN/100 ml (The Minister of Health Regulation Number 492 of 2010, concerning Drinking Water Quality Requirements), it is necessary to treat the production process water using a Melt Blown Filter (MBF) and UV-C rays. The purpose of this study was to determine the differences in the variation of the 1, 3, and 5-micron of Melt Blown Filter cartridge 10” in reducing the amount of total Coliform, as well as the water hardness and their effect on disinfection using UV-C rays. The type of research used is experimental research with a pretest-posttest without control research design. There is a reduction in the average total Coliform after the treatment using a Melt Blown Filter, with a result of 1, 3, and 5-micron as 2.95 MPN /100ml, 3.61 MPB/100 ml, and 7.31 MPN/100 ml with a percentage reduction of 100%, 94.5%, and 82.4%, respectively. The average total Coliform using the Melt Blown Filter equipped with the UV-C rays treatment resulted in a reduction of 1, 3, and 5-micron as 2.95 MPN/100 ml, 3.95 MPN/100 ml, 8.88 MPN/100 ml respectively, with a reduction percentage of 100%, for each treatment. The data analysis for total coliform using the One-Way ANOVA test resulted in a pvalue of 0.001, the effective variation obtained is 1-micron MBF equipped with UV-C rays. The analysis of results pertaining to the water hardness data showed that the use of Melt Blown Filter could not reduce water hardness, but the UV-C rays could still be used accordingly. The data analysis for water hardness was performed using KruskalWallis with a p-value of 0.820, meaning that there are no differences in Melt Blown Filter variation on the results of total water hardness value.
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 181--190
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Phenomenon of Medical Waste Recycling in Indonesia: Contact Time and Chlorine Dose as a Disinfectant with the Bio-Indicator Bacillus subtilis and Bacillus stearothermophilus
Autorzy:
Fikri, Elanda
Kurniati, Iis
Wartiniyati, -
Prijanto, Teguh Budi
Pujiono, -
Syarief, Osman
Khair, Amar Sharaf Eldin
Powiązania:
https://bibliotekanauki.pl/articles/1839585.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
recycling
medical waste
dosage
duration of contact
chlorine
disinfection
Opis:
Efforts that have been done to manage the Hazardous and Toxic waste into non-Hazardous and Toxic waste are done by emptying, shredding, washing, and rinsing at least 3 times and disinfecting using chlorine. This is in accordance with the Indonesian Regulation of Ministry of Health No. 27 of 2017, which has stated that surface cleaning is permitted to use 0.05% chlorine during the process. Furthermore, in the Indonesian Regulation of the Ministry of Environment and Forestry No.56 of 2015, the chemical disinfection process is permitted to use an additional 3–6% sodium hypochlorite (NaOCl). However, there are still differences in dosage and it has not been mentioned regarding the immersion period during the disinfection process on both of the regulations. The purpose of this study was to determine the difference in contact time and the dose of chlorine as a disinfectant on the number of Bacillus subtilis and Bacillus stearothermophilus in the medical waste recycling process. The research design used in this study was a Randomized Factorial Design with experimental research type. A total of 104 recyclable medical waste samples were taken, using 3 treatments and 6 repetitions. The average temperature of the chlorine solution at the contact time of 15 minutes, 30 minutes, and 45 minutes was 24.34 °C; 24,53 °C; and 24,54 °C respectively, while the average pH of the chlorine solution at the contact time of 15 minutes, 30 minutes, and 45 minutes was 8.344; 8,375; and 8,461 respectively. The results showed that there was no difference in the duration of contact and the dose of chlorine as a disinfectant in the medical waste recycling process with a p-value of 0.377. The percentage reduction in the number of Bacillus subtilis and Bacillus stearothermophilus before and after treatment was 99.99% based on 4 positive controls. The findings in this study were the duration of contact time and the effective dose used in the recycling process of medical waste, which was at a dosage of 0.03% with 45 minutes of contact time. The government needs to conduct a re-assessment regarding the recommended ideal dosage in the surface disinfection process so that it would not cause a potential risk to humans or the environment.
Źródło:
Journal of Ecological Engineering; 2021, 22, 4; 47-58
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Characteristics of Aceh Traditional Salt and Its Potential as Raw Material for Thermal Energy Storage
Autorzy:
Gunawati, -
Humaidi, Syahrul
Setiawan, Adi
Sirait, Makmur
Jalil, Zulkarnain
Ramadhani, Nadilla
Makruf, Amar
Riskina, Shafira
Irhamni, -
Powiązania:
https://bibliotekanauki.pl/articles/2026731.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
aceh salt
enthalpy
thermal conductivity
thermal energy storage
Opis:
Thermal energy storage is an important element in order to conserve the energy and optimize the overall efficiency. Development of energy storage system for local purposes requires some information on the raw material which is abundantly available in the local market. This study aimed to investigate the characteristics of traditionally produced salt in Aceh in terms of its potential use as a raw material for thermal energy storage. The sample was collected from the Aceh Besar District and treated by heating at temperatures of 400 °C and 800 °C in a muffle furnace. This treatment is carried out to study the changes in properties and define the best procedure for salt preparation. All samples were characterized under a number of techniques including XRF, XRD, SEM/EDS, TGA/DSC analysis, density, thermal conductivity, and electrolytic conductivity. The XRF characterization showed that the local Aceh salt was graded as a category III salt. Furthermore, according to the TGA/DSC characterization, the melting temperature is close to 800 °C, and the enthalpy value is close to 492 kJ/kg. It is ample evidence that the Aceh salt can be used as a thermal energy storage material. Furthermore, increasing the temperature of local salt’s heat treatment contributes to increasing the enthalpy value, crystal size, density, thermal conductivity, and electrolyte conductivity.
Źródło:
Journal of Ecological Engineering; 2022, 23, 2; 116-122
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of socio-economiс variables for the constantine tramway line
Autorzy:
Harkat, Imane
Amar, Nadra Nait
Benrachi, Bouba
Gattuso, Domenico
Powiązania:
https://bibliotekanauki.pl/articles/2203905.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
evaluation
variables
tramway
Constantine
ocena
zmienne
tramwaj
Opis:
The Constantine tramway line in Algeria has many variables that can be analysed to assess the impact of the line. These variables include social ones, such as the rational supply of transport between different modes of travel, the place of people with reduced mobility in the supply and interior and exterior design. Moreover, the economic variables that are the most dominant in relation to its importance in the development of the economy of the city are the reliability and comfort made to the regularity of the transport time in relation to time savings and intermodality at stopping points. To this end, this article examines these different variables during several commissioning periods in order to determine the impact of the introduction of the tramway line in the Constantine metropolitan area. Its approach is carried out through a field survey, interviews and on-site observations with a population made up of users of different travel modes. The results confirm that the tramway line linking the city of Constantine and the new town of Ali Mendjeli has a strong effect on ridership. On the other hand, its effects seem minimal in terms of rational supply and intermodality between different travel modes. Meanwhile, reliability and regularity are topics that deserve to be explored. The accessibility of people with reduced mobility is considered a primary objective of the tramway system.
Źródło:
Transport Problems; 2022, 17, 3; 173--186
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on fire potential of ventilation ducts
Autorzy:
Jha, Ankit
Amar, Vinod
Tukkaraja, Purushotham
Powiązania:
https://bibliotekanauki.pl/articles/1839004.pdf
Data publikacji:
2019
Wydawca:
Główny Instytut Górnictwa
Tematy:
auxiliary ventilation
heat release rate
emission factor
differential scanning calorimetry
thermogravimetric analysis
wentylacja pomocnicza
szybkość wydzielania ciepła
współczynnik emisji
różnicowa kalorymetria skaningowa
analiza termograwimetryczna
Opis:
Fires in underground mines can create dangerous conditions for personnel and cause severe damage to property. Because of the confined nature of the underground environment, these effects can escalate rapidly. In underground mines, air ducts/bags are used for ventilating narrow blind headings; these consist of combustible materials that have not been investigated thoroughly in terms of their fire potential and gas emissions. The primary objective of this study is to investigate the fire potential and emission factors for these ducts. A preliminary investigation was performed using differential scanning calorimetry and thermogravimetric analysis. These tests provide crucial information for duct samples including the melting point which is used for designing a novel experimental setup for combustion analysis. This setup was used to perform a combustion experiment at 350 °C, so that all specimens can achieve complete combustion. Furthermore, the heat release rate and emission factors were calculated; it was observed that heat release rate for all the specimens was identical because of similar oxygen consumption during the experiment. Sample B has the lowest emission factor among the four samples (A, B, C, D) tested in this study.
Źródło:
Journal of Sustainable Mining; 2019, 18, 4; 270-276
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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