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Tytuł:
Chemically reacting ionized radiative fluid flow through an impulsively started vertical plate with induced magnetic field
Autorzy:
Ahmed, T.
Alam, M. M.
Ferdows, M.
Tzirtzilakis, E. E.
Powiązania:
https://bibliotekanauki.pl/articles/264343.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
warstwa graniczna
promieniowanie
pole magnetyczne
gaz zjonizowany
boundary layer
radiative flow
strong magnetic field
ionized gas
flow field
Opis:
Numerical studies have been performed to examine the chemically reacting ionized fluid flow through a vertical plate with induced magnetic field. This study is performed for the cooling problem. To obtain the nondimensional non-similar momentum, the induced magnetic field, energy and concentration equations, usual nondimensional variables have been used. The numerical solutions for the velocity fields, induced magnetic fields, temperature distribution as well as concentration distribution are obtained for associated parameters using the explicit finite difference method. The local and average shear stresses, current densities, Nusselt number as well as the Sherwood number are also investigated. The obtained results are discussed with the help of graphs to observe effects of various parameters entering into the problem. Also the stability conditions of the explicit finite difference method are analyzed. Finally, a qualitative comparison of the present results with previously published results has been made.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 5-36
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
RATING OF THE VALENCE OF TWENTY NEGATIVES IMAGES FROM IAPS BY A SAMPLE OF MOROCCAN NURSE STUDENTS
Autorzy:
Bandadi, Lahcen
Touhami Ahami, Ahmed Omar
Ahami, Ahmed O. T
Powiązania:
https://bibliotekanauki.pl/articles/2137941.pdf
Data publikacji:
2020-09-25
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
IAPS
SAM
emotions
nurse students
Opis:
This study aims to rate twenty negative images from IAPS among a sample nurse students. We compare the mean valences between males and females and between participants from the final semester and participants from the first semester. The comparison of the mean valences values between the current study and the norm mean valence values from IAPS was established. null We tested 100 students from Higher Institute of Nursing Professions and Technics of Health, Rabat, Morocco, were recruited. The panel valence from SAM was cued to evaluate the perceived pleasure and unpleased degree after exposing the different images from IAPS to the participants. The displeasure degree among nurse students from final semester is lower than that of the first semester with a significant difference in sixteen images. Regarding the difference between males and females, the significant difference was observed only in five images. The all images evaluated by participant were perceived as negative (valence <4). Regarding the comparison of the mean valences values between a the current study and the norm mean valence values from IAPS significant differences were observed. Nurse students from the final semester, compared to the first semester students, perceived the negative images assessed as less unpleasant. However, we noted that the all images have kept the negative aspect. These results show that these images can be used as a negative emotional stimulus among this population.
Źródło:
Acta Neuropsychologica; 2020, 18(3); 383-391
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does work stress affect neurocognitive functions? Case of Moroccan workers
Autorzy:
Arji, Samira
Elhaddadi, Mounia
Ahami, Ahmed O.T.
Ziri, Rabea
Powiązania:
https://bibliotekanauki.pl/articles/29519454.pdf
Data publikacji:
2022-11-29
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
work stress
working memory
perception
precision
ability to concntrate
Opis:
Depending on its stage, stress influences cognitive functions. Indeed, several authors have ensured the degradation of cognitive functions by stress. Others did not find any association between the two. A third group of authors claimed that stress improves the performance of certain cognitive functions. Faced with this inconsistency of results, we conducted this study with the aim of finding out whether job stress alters or stimulates cognitive functions. Our study focused on 102 workers who were asked to freely and anonymously complete a questionnaire deemed relevant at the international scale. The age of the participants is between 22 and 60 years old with an average of 37 years and a standard deviation of 11 years. The population is made up of 77% of men and 23% of women. For the school level of the subjects: 50% of the subjects have a level bac to bac+2, 30% have a level higher than bac+2 and 20% have a level lower than bac. The professional status of workers is divided into three types: 48% are supervisors and technicians, 32% are executing workers and 20% are senior managers. The participants underwent two neurocognitive tests using the ELIAN software. Analysis of the results shows that there is no significant link between work stress and the cognitive functions studied. However, the analysis of the results of each socio-professional category separately shows that stress significantly reduces the visual working memory score of young people (< 40 years old), as well as the ability to concentrate of subjects with a school level higher than bac+2. While it improves visual perception in men and old people over the age of 40. There are significant links between some cognitive performances and the socio-professional characteristics of the stressed subjects. Therefore, work stress can affect neurocognitive health, which is more serious. In order to understand the relationship between work or chronic stress and cognition as well as their moderating factors, it is advisable to increase the size of the sample and to diversify the cognitive functions studied as well as their tasks.
Źródło:
Acta Neuropsychologica; 2022, 20(4); 393-407
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determinants of burnout and its prevalence among employees in a Moroccan private company
Autorzy:
Arji, Samira
Ziri, Rabea
Aboussaleh, Youssef
Azzaoui, Fatima Zahra
Krupa, Kamil
Ahami, Ahmed O.T.
Powiązania:
https://bibliotekanauki.pl/articles/28762789.pdf
Data publikacji:
2023-10-25
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
work environment
emotional exhaustion
depersonalization
personal accomplishment
Opis:
Burnout or occupational exhaustion syndrome is a neuropsychological disorder resulting from chronic stress at work. Employees of private companies are highly exposed to this risk because of the overload of work in addition to the long daily working hours. We have therefore conducted a study whose aim is to assess the prevalence of burnout and its components, as well as to study socio-professional determinants among employees. We tested 102 employees aged between 22 and 60 years with an average age of 36.76 years ± 10.5 years. 77% were men and 24% were women. They were asked to complete freely and anonymously a general information sheet and the MBI questionnaire “Maslach Burn-out Inventory” in its French version with language adaptation. This consists of 22 items, evaluating three dimensions: emotional exhaustion (EE), depersonalization (DP) and personal accomplishment (PA). A score was calculated and a rating in the degree of severity (low, moderate and high) was given for each of the dimensions, according to internationally accepted standards. The analysis of the results showed a high prevalence of burnout. Statistical analyses show that the rate of burnout in the age group over 40 equals 47.2% against 31.8% only among employees aged under 40. Similarly, the burnout rate among women is about the same as men (p=0.977). Emotional exhaustion (EE) is the most widespread component in exhausted subjects. It was found to be high for 14.7% of employees; while depersonalization (DP) or high cynicism affects only 3.9% of subjects. Significant links between depersonalization and gender as well as professional seniority are obtained. Concerning the level of schooling, the rate of burnout decreases when the school level increases but without significance (p = 0.474). The rate of burnout is high among executing workers followed by senior managers. However, this link remains statistically insignificant. Concerning seniority, we note that the prevalence of burnout increases with professional seniority and even in the meaningless position. We also observe a higher rate of burnout among employees with company seniority of less than 10 years in addition to the oldest, but without any meaning. Professional exhaustion or burnout exists strongly in Moroccan companies. In order to be able to adapt to the rapid development of the market and its increased demands, it is essential that business leaders prevent this pathology by improving the psychosocial work environment.
Źródło:
Acta Neuropsychologica; 2023, 21(4); 427-439
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the carbon sequestration capacity of arid mangroves along nutrient availability and salinity gradients along the Red Sea coastline of Saudi Arabia
Autorzy:
Shaltout, K.H.
Ahmed, M.T.
Alrumman, S.A.
Ahmed, D.A.
Eid, E.M.
Powiązania:
https://bibliotekanauki.pl/articles/48145.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
carbon sequestration
coastal wetland
mangrove
climate change
nutrient availability
salinity gradient
Red Sea
Saudi Arabia
Źródło:
Oceanologia; 2020, 62, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Lower Zab river water quality using both Canadian Water Quality Index Method and NSF Water Quality Index Method
Autorzy:
Ahmed, Sarah M.
Taha, Omer M.E.
Najemalden, Mohamed A.
Ahmed, Rehab T.
Abedulwahab, Ali A.
Powiązania:
https://bibliotekanauki.pl/articles/118599.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
NSF Water Quality Index
Canadian Water Quality Index
Lower Zab river
physicochemical parameters
dissolved oxygen
biochemical oxygen demand
Opis:
Rivers are considered the most important sources of surface water on Earth. They are play a significant role in all human activities and the quality of river water is needed. Therefore, the importance of the water quality index is arising through providing data base about quality of the water source, and explain the change in the water quality over a period of time continually. This study involved determination of physicochemical and biological parameters of Lower Zab river in Kirkuk city at two different points. The objectives of the study are to assess the present water quality, through analysis of some selected water quality parameters like pH, TDS, BOD, dissolved oxygen, turbidity, EC, alkalinity, and salinity etc. and to compare the results with the Canadian Council of Ministers of the Environment and National Sanitation Foundation Water Quality Indices. Raw water samples were collected from the Lower Zab river twice a month by one sample every 15 days from each station. The water quality data include 16 different parameters. Tests were carried out following the American Public Health Association standard methods. The results show that all parameters values were within the standards of drinking water proposed by the CCME standards and Iraqi standards or the World Health Organization standards for drinking purpose, except turbidity, DO, nitrate, calcium, which were mostly higher than the standards and sometimes BOD and potassium. The results of WQI showed that the water quality at LZ3 station is lower than LZ2 station due to the polluting activity of the Lower Zab river. Furthermore, for the years 2014, 2015, and 2016, the water quality was degraded due to the ISIS war. Also, it was noted in the 2013 year that the water quality degraded more in fall and winter seasons due to that the earth has exposed to the long-dried season and then suddenly exposed to a high rainfall season which in turns leads to increase some parameters very high (i.e. turbidity). Finally, the Lower Zab river water cannot be use for drinking directly. However, a pretreatment is needed before the drinking use.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 2; 155-171
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of pyramid/nanowire binary structure on n-type silicon using chemical etching
Autorzy:
Si Ahmed, Y.
Hadjersi, T.
Chaoui, R.
Powiązania:
https://bibliotekanauki.pl/articles/1068526.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.40.jj
Opis:
A pyramid and nanowire binary structure of n-type monocrystalline silicon surface was fabricated by two-step chemical etching process. The nanowire surface is formed by electroless etching in HF-AgNO₃ aqueous solution after being textured in KOH/IPA solution. Optical absorption was compared between this structure and that of random pyramid arrays. The effective reflectance calculated between 400 and 1100 nm decreased from ≈ 40% to ≈ 15% after pyramidal texturing and ≈ 4% after formation of vertically aligned nanowires with a length less than 1 μ m. This simple and low-cost surface structuring technique holds high potential for the manufacture of terrestrial silicon solar cells with reduced optical losses.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 385-387
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Design Methodology For Enhancing The Transient Loading Of Low Drop-out Regulators (LDRs)
Autorzy:
Abdel-Monem, Ahmed
El-Mashade, Mohamed B.
Dabbous, T. E.
Powiązania:
https://bibliotekanauki.pl/articles/227180.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low drop-out regulator
cross coupling
jumps of the load current
undershot
overshot
Opis:
A new simple design methodology which makes LDR output nearly insensitive to jumps of the load current for long times is proposed. This methodology is tested for more than 10⁴ seconds. Our procedure leans on cross coupling of the time second derivative of the LDR power transistor gate and drain voltages along with their currents. This technique keeps low values of these currents in order of nano or hundreds of micro amperes for undershot or overshot cases, respectively. The introduced methodology has been applied to a standard CMOS of 0.18μm technology for NMOS transistors and validated using MATLAB R2014a.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 319-327
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamical complexity of human responses: a multivariate data-adaptive framework
Autorzy:
Ahmed, M.
Rehman, N.
Looney, D.
Rutkowski, T.
Mandic, D.
Powiązania:
https://bibliotekanauki.pl/articles/201559.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multivariate sample entropy
multivariate empirical mode decomposition (MEMD)
multivariate multiscale entropy
complexity analysis
multivariate complexity
postural sway analysis
stride interval analysis
brain consciousness analysis
alpha-attenuated EEG data
Opis:
Established complexity measures typically operate at a single scale and thus fail to quantify inherent long-range correlations in real-world data, a key feature of complex systems. The recently introduced multiscale entropy (MSE) method has the ability to detect fractal correlations and has been used successfully to assess the complexity of univariate data. However, multivariate observations are common in many real-world scenarios and a simultaneous analysis of their structural complexity is a prerequisite for the understanding of the underlying signal-generating mechanism. For this purpose, based on the notion of multivariate sample entropy, the standard MSE method is extended to the multivariate case, whereby for rigor, the intrinsic multivariate scales of the input data are generated adaptively via the multivariate empirical mode decomposition (MEMD) algorithm. This allows us to gain better understanding of the complexity of the underlying multivariate real-world process, together with more degrees of freedom and physical interpretation in the analysis. Simulations on both synthetic and real-world biological multivariate data sets support the analysis.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 433-445
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Triangular Core Rotation of a Hybrid Porous Core Terahertz Waveguide
Autorzy:
Ali, S.
Ahmed, N.
Alwee, S.
Islam, M.
Rana, S.
Bhuiyan, T.
Powiązania:
https://bibliotekanauki.pl/articles/227154.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porous core waveguide
THz waveguide
flat EML
hybrid design
flat dispersion
triangular design
core rotation
Opis:
In this paper, we investigate the effects for rotating the triangular core air hole arrangements of a hybrid design porous core fiber. The triangular core has been rotated in anticlockwise direction to evaluate the impact on different waveguide properties. Effective Material Loss (EML), confinement loss, bending loss, dispersion characteristics and fraction of power flow are calculated to determine the impacts for rotating the triangular core. The porous fiber represented here has a hybrid design in the core area which includes circular rings with central triangular air hole arrangement. The cladding of the investigated fiber has a hexagonal array of air hole distribution. For optimum parameters the reported hybrid porous core fiber shows a flat EML of ±0.000416 cm⁻¹ from 1.5 to 5 terahertz (THz) range and a near zero dispersion of 0.4±0.042 ps/THz/cm from 1.25 to 5.0 THz. Negligible confinement and bending losses are reported for this new type of hybrid porous core design. With improved concept of air hole distribution and exceptional waveguide properties, the reported porous core fiber can be considered as a vital forwarding step in this field of research.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 1; 25-31
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of hydraulic sweeps in horizontal wells
Badanie możliwości oczyszczania hydraulicznego w otworach poziomych
Autorzy:
Nguyen, T. N.
Miska, S. Z.
Yu, M.
Takach, N. E.
Ahmed, R.
Powiązania:
https://bibliotekanauki.pl/articles/300465.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
otwory poziome
oczyszczanie hydrauliczne
horizontal wells
hydraulic sweeps
Opis:
Drilling fluid sweeps are commonly run in the field to help clean the borehole of cuttings that have not been removed with normal drilling fluid circulation, especially in high angle or extended reach wells where efficient hole cleaning is more difficult to maintain. This study focuses on the use of "conventional" and "enhanced" sweeps in horizontal well bores. Not much information pertaining to the use of drilling fluid sweeps is available in the literature. Furthermore, there has been a lack of agreement as to which types of sweep fluids are most effective. Conventional sweeps most often include high viscosity fluids, high density fluids or a combination of both. In addition to conventional sweep fluids, an attempt was made to use enhanced sweep fluids, in which surfactants are used to attach cuttings to oil droplets that are intentionally introduced to the drilling fluid system. Because of their low density, oil droplets can have the ability to keep cuttings particles in suspension. The use of oil droplets is a new concept in cleaning horizontal and deviated wellbores. This work focuses on experimental analysis of sweep fluids with the goal of quantifying the sweep "efficiency". A small-scale sweep loop (SSL) was mainly used to conduct sweep experiments. Moreover, some experiments were carried out in a field-scale flow loop that operates at low-pressure ambient temperature (LPAT) conditions. Results show that pipe rotation plays a very important role in improving hole cleaning. Particularly, the improvement is substantial with high-viscosity fluids. The rotation of pipe has agitation effect that forces the cuttings particles into the main flow and facilitates the removal process. As anticipated, increasing the flow rate enhances the sweep efficiency or cuttings removal regardless of the drillpipe rotation. Furthermore, the study suggests that with a more rigorous evaluation of sweep efficiency, one can objectively determine the type and frequency of drilling sweep. The results of this study are useful for selection of the optimal sweep fluid.
Płuczki czyszczące są powszechnie stosowane do oczyszczania otworów z pozostałości zwiercin, których nie udało się wynieść na powierzchnię za pomocą tradycyjnych płynów płuczkowych, głównie w przypadku otworów kierunkowych i rozgałęzionych, gdzie możliwość oczyszczenia jest ograniczona. Badania skoncentrowały się na wykorzystaniu konwencjonalnych i ulepszonych systemów czyszczących w otworach kierunkowych. W literaturze niezbyt wiele można znaleźć informacji na ten temat. Co więcej, brak jest zgody co do tego, która płuczka czyszcząca jest najskuteczniejsza. Tradycyjne płuczki czyszczące często zawierają płyny o wysokiej lepkości i/lub gęstości. Ponadto podjęto próbę stworzenia ulepszonych płuczek czyszczących, w których zastosowane surfaktanty mają powodować przyklejanie się zwiercin do drobin oleju, który celowo wprowadzono do systemu płuczkowego. Ze względu na niską gęstość, krople oleju utrzymują zwierciny w zawieszeniu. Zastosowanie kropli oleju to nowa koncepcja oczyszczania otworów horyzontalnych. W artykule skoncentrowano się na przeanalizowaniu płuczek czyszczących mających na celu zwiększenie skuteczności oczyszczania. Do badań z reguły stosowano mały obieg czyszczący SSL (small-scale sweep loop). Niektóre eksperymenty prowadzono na złożu w warunkach niskiego ciśnienia i temperatury otoczenia. Wyniki pokazują, że ruch rur odgrywa istotną rolę w zwiększeniu skuteczności oczyszczania otworu. Służy temu również zastosowanie wysoko lepkich płuczek. Rotacja rur podrywa zwierciny doprowadzając je do głównego strumienia, wspomagając proces oczyszczania. Jak przewidywano, ruch w otworze wzmaga wydajność oczyszczania lub wynoszenia zwiercin, niezależnie od rotacji rur. Z badań wynika, że szacując bardziej rygorystycznie zdolności czyszczące, można obiektywnie określić rodzaj i częstotliwość oczyszczania. Wyniki badań pozwalają na stosowny wybór optymalnego środka czyszczącego.
Źródło:
Wiertnictwo, Nafta, Gaz; 2010, 27, 1--2; 307-331
1507-0042
Pojawia się w:
Wiertnictwo, Nafta, Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimizing of tunneling effect on existing infrastructure in Egypt
Autorzy:
Asker, Kamel I.
Fouad, Mohamed T.
Bahr, Mohamed A.
El-Attar, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/35525187.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
tunneling
grouting
field measurements
Abaqus
Al-Azhar twin tunnel
Opis:
A set of parametric studies by using the Abaqus software is conducting to investigate the effective method to seal the CWO sewer from the tunneling process. These methods include: (i) two deep grouted walls, (ii) adjacent slurry piles, (iii) bored reinforced concrete piles assisted with slurry piles, and (iv) grouted block confining the twin tunnel wall. Based on the results of parametric studies. Most of the protective studied technique was effective on reducing the tunneling effect on the ground movements.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 1; 3-15
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
COD reduction studies of paper mill effluent using a batch recirculation electrochemical method
Autorzy:
Kannadasan, T.
Sivakumar, V.
Ahmed Basha, C.
Parwate, A. V.
Senthilkumar, K.
Kannan, K.
Powiązania:
https://bibliotekanauki.pl/articles/778894.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
oczyszczalnia ścieków
czas przebywania dystrybucji
reaktor elektrochemiczny
ścieki celulozowo-papiernicze
effluent treatment
residence time distributions
electrochemical reactor
Pulp and Paper mill effluent
Opis:
The conventional method of treating pulp and paper mill effluent involves the biological oxidation by bacterial action of aerobic and anaerobic conditions and aerobic lagooning method, which are less efficiency of removing COD. To overcome the drawbacks of the existing treatment process, in the present work an attempt has been made to study the electro oxidative destruction of the pulp and paper mill effluent using an electrochemical method and the effect of various parameters such as concentration of supporting electrolytes, current densities, flow rates of electrolyte and reservoir volumes of the effluent were conducted. From the experimental results it is observed that the rate of reduction of COD of the effluent increased with an increase in the supporting electrolyte (sodium chloride) concentration, current density where as it decreased with increase in the reservoir volume and the flow rate of electrolyte. The residence time distributions studies have also been conducted to study the behavior of the electrochemical reactor.
Źródło:
Polish Journal of Chemical Technology; 2011, 13, 3; 37-41
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of (SnO2)1-x(ZnO)x Thin Films Prepared by Spray Paralysis Technique
Autorzy:
Nahida, Bukhееt Hasan
Zahra'a, Adеl Jawad
Mohammed, Ahmed Mohammed
Huda, Bukhееt Hasan
Powiązania:
https://bibliotekanauki.pl/articles/1179187.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
optical propеrtiеs
spray pyrolysis tеchniquе
thin films
еnеrgy gap
Opis:
Thе study of thе optical propеrtiеs is usеful in thе task of dеtеrmining thе naturе of thе practical application that can bе usеd to rеcord film matеrial. Thе optical propеrtiеs of thе mixеd (SnO2)1−x(ZnO)x thin films dеpositеd on a glass substratе by spray pyrolysis tеchniquе (SPT) at a substratе tеmpеraturе 400 °C havе bееn invеstigatеd by thе transmission spеctra at room tеmpеraturе wеrе mеasurеd in thе rangе from 300 to 1100 nm.Thе optical study rеvеalеd that thе films wеrе highly absorbеd with a dirеct typе of transition. Also thе dirеct еnеrgy gap was obsеrvеd to incrеasе with incrеasing of ZnO Vol.%
Źródło:
World Scientific News; 2017, 83; 182-193
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quick Handover in 5G for High Speed Railways and Highways Using Forward Handover and PN Sequence Detection
Autorzy:
Kawser, Mohammad T.
Abir-Hassan, Kazi Md.
Haque, Md. Atiqul
Ahmed, Sakif
Akram, Mohammad Rubbyat
Powiązania:
https://bibliotekanauki.pl/articles/2202998.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
5G
High Speed Vehicles
Forward Handover
PN Sequence
Radio Link Failure
Ping-Pong
Opis:
The cellular users, on high speed railways and highways, travel at a very high speed and follow a nearly straight path, in general. Thus, they typically undergo a maximum frequency of handovers in the cellular environment. This requires a very fast triggering of the handover. In the existing method of handover in 5G cellular communication, for high speed users, neither the decision-making of handover nor the triggering of handover is sufficiently fast. This can lead to poor signal quality and packet losses and in the worst case, radio link failure (RLF) during a handover. This paper proposes a forward handover based method, combined with PN sequence detections, to facilitate a quicker handover for high speed users on railways and highways. The proposed method adds some complexity but can offer a significant improvement in the overall handover delay. A simplistic simulation is used to demonstrate the improvement of the proposed method.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 147--153
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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