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    Wyświetlanie 1-31 z 31
    Tytuł:
    PERCEPTUAL LOAD MANIPULATION DOES NOT REVEAL SENSITIVITY ON THE N170 ERP COMPONENT OF MANIPULATED FACES AND BODIES
    Autorzy:
    Mohamed, Tarik N
    Powiązania:
    https://bibliotekanauki.pl/articles/2138135.pdf
    Data publikacji:
    2017-11-28
    Wydawca:
    Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
    Tematy:
    manipulated face
    body
    selective attention
    N170
    LNC
    Opis:
    Background: It has been controversial in the face recognition literaturę whether face-sensitive N170 is affected by selective attention. Attention was manipulated according to Lavie’s perceptual load theory, examining the effect of selective attention on the processing of faces and human bodies. Faces and human bodies were presented either intact or manipulated. Material/Methods: 18 Students (9Males) from Sohag University, aged between 19 and 22 years (M = 19.38, SD = 0.48) contributed data in this study. All participants were right handed, and had normal or corrected-to-normal visual acuity. Participants were instructed to detect specific letter strings „X or N” among different (i.e., High load), or identical (Low load) letters. Letters were superimposed on different distractors. Stimuli were presented intact (Exp.1), or manipulated (Exp.2-4), by removing certain features or parts in the face and body respectively. ERP technique was used and prominent N170 and LNC were measured. Results: It was found that there is no effect of selective attention on the face sensitive N170. It seems that cropped face N170 is not affected by selective attention. However, the N170 of faces and human bodies are not affected by selective attention. The LNC findings showed that this component is affected by selective attention with enhanced negativity under low load Conditions compared to high load conditions. Conclusions: The findings of the current study showed that either cropped faces and human bodies does not reveal sensitivity on the N170 ERP component of manipulated faces and bodies.
    Źródło:
    Acta Neuropsychologica; 2017, 15(3); 325-340
    1730-7503
    2084-4298
    Pojawia się w:
    Acta Neuropsychologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Artifi cial Neural Networks (ANN) in Forecasting Housing Prices in Ankara, Turkey
    Autorzy:
    Kitapci, Olgun
    Tosun, Ömür
    Tuna, Murat Fatih
    Turk, Tarik
    Powiązania:
    https://bibliotekanauki.pl/articles/540608.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
    Tematy:
    Housing,
    artifi cial neural networks,
    forecasting,
    prices,
    Turkey
    Opis:
    The purpose of this paper is to forecast housing prices in Ankara, Turkey using the artificial neural networks (ANN) approach. The data set was collected from one of the biggest real estate web pages during April 2013. A three-layer (input layer – one hidden layer – output layer) neural network is designed with 15 different inputs to forecast the future housing prices. The proposed model has a success rate of 78%. The results of this paper would help property investors and real estate agents in developing more effective property pricing management in Ankara. We believe that the artifi cial neural networks (ANN) proposed here will serve as a reference for countries that develop artifi cial neural networks (ANN) method-based housing price determination in future. Applying the artifi cial neural networks (ANN) approach for estimation of housing prices is relatively new in the field of housing economics. Moreover, this is the fi rst study that uses the artificial neural networks (ANN) approach for analyzing the housing market in Ankara/Turkey.
    Źródło:
    Journal of Marketing and Consumer Behaviour in Emerging Markets; 2017, 1(5); 4-14
    2449-6634
    Pojawia się w:
    Journal of Marketing and Consumer Behaviour in Emerging Markets
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Management of solitary cecum diverticulitis – Single-Center Experience
    Autorzy:
    Gonullu, Emre
    Yigit, Merve
    Mantoglu, Baris
    Capoglu, Recayi
    Harmantepe, Tarik
    Gunduz, Yasemin
    Altintoprak, Fatih
    Bayhan, Zulfu
    Erkorkmaz, Unal
    Powiązania:
    https://bibliotekanauki.pl/articles/1391561.pdf
    Data publikacji:
    2021
    Wydawca:
    Index Copernicus International
    Tematy:
    acute appendicitis
    appendectomy
    cecum diverticulitis
    cecum diverticulum
    diverticulitis
    Opis:
    Objective: Cecal diverticulitis may be encountered as a real etiological factor in 1/300 appendectomies. Differential diagnosis of acute appendicitis and cecal diverticulitis is crucial because of the different treatment methods. Our aim is to reveal the importance of distinguishing acute appendicitis from cecal diverticulitis. Methods: The data of patients who were admitted to the hospital between 2015 and 2019 with the complaint of abdominal pain and then finally diagnosed with colon diverticular disease, colon diverticulitis, or acute appendicitis, analyzed retrospectively. Results: A total of 19 cecum diverticulitis patients were detected during surgery for acute appendicitis or during clinical and radiological evaluation. 1247 appendectomies were evaluated; the final diagnosis was observed as cecal diverticulitis in 5 patients (0,4%). One hundred nineteen patients diagnosed with colonic diverticulitis at admission were evaluated, while 105 (88,2%) of them had left-sided diverticulitis, 14 (11,7%) of them had solitary cecal diverticulitis. All of the solitary cecal diverticulitis patients were treated conservatively, except one patient who has Hinchey 3 diverticulitis. Conclusion: Differential diagnosis of cecum diverticulitis with acute appendicitis is important because cecum diverticulitis can be managed as conservatively in most cases. In order to prevent unnecessary surgical interventions, this importance has increased, especially during the COVID-19 pandemic period.
    Źródło:
    Polish Journal of Surgery; 2021, 93, 4; 15-20
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of pain in musculoskeletal system reported by office workers and the pain risk factors
    Autorzy:
    Celik, Sevim
    Celik, Kadir
    Dirimese, Elif
    Taşdemir, Nurten
    Arik, Tarik
    Büyükkara, İbrahim
    Powiązania:
    https://bibliotekanauki.pl/articles/2161856.pdf
    Data publikacji:
    2017-10-18
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    pain
    computer users
    ergonomics
    work-related musculoskeletal complaints
    office worker
    work design
    Opis:
    Objectives: This research was conducted as a cross-sectional descriptive study aimed at determining the existence of pain in the musculoskeletal system among office workers and the reasons for it. Material and Methods: The sample consisted of 528 office workers. Collection of data was achieved using a questionnaire prepared by the researchers in line with information from the literature. Results: The male and female office workers most frequently complained of pain in the lower back (55.1%), neck (52.5%) and back (53%). It was seen that out of the variables relating to the work environment, those which had the most significant effect on muscular-skeletal system pain were sitting at the desk for a long time without a break, working sitting on a chair that supported only the lumbar area and the arms, having the computer mouse at a distance from the keyboard, having the head inclined at 45° when working, working holding both forearms above the level of the desk, not taking exercise in daily life, and having a moderate or extremely stressful workplace (p < 0.05). Conclusions: The conclusion has been reached in this study that in order for office workers not to suffer musculoskeletal system pain, it is very important that the working environment should be ergonomically arranged and that various measures should be taken to ensure healthy life behavior. Int J Occup Med Environ Health 2018;31(1):91–111
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2018, 31, 1; 91-111
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simple and Combined Pretreatment of a Mixture of Forestry and Aromatic-Medicinal Plant Waste by Chemical, Physical and Enzymatic Methods
    Autorzy:
    Bendaoud, Ahmed
    Belkhiri, Abdelkhalek
    Maai, Mohamed
    Moubchir, Tarik
    Hmamou, Anouar
    Tlemcani, Sara
    Eloutassi, Noureddine
    Lahkimi, Amal
    Powiązania:
    https://bibliotekanauki.pl/articles/24201758.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    biomass
    lignocellulosic complex
    pretreatment
    cellulose
    plant waste
    Opis:
    Forestry waste (FW) extracted parts ofmedicinal-aromatic plant waste (EPW) and unused parts (UPW) are considered potential resources for energy recovery (their heating value of approximately 19 MJ/kg).In order to valorize lignocellulosic biomass, a pretreatment process is required to hydrolyze the recalcitrant lignocellulosic complex into fermentable simple sugars. The aim of this study is to determine the best method of pretreatment that takes into account treatment time, efficiency, and environmental friendliness. The mixture of FW, EPW, and UPW was treated by simple and combined treatment using different methods like acid sulfuric (Ac), steam explosion (SE), and enzymatic (E) (cellulase and hemicellulase).The results showed that the combined and simple Ac treatments are the mostefficient compared with SE and E treatments in the hydrolysis of polysaccharide of cellulose with a rate respectively of 90.5% and 77.6% and hemicellulose with a rate respectively of 80.63% and 87.14%. In addition, both of the preceding methods release an important rate of total phenolic compounds. Combined treatment demands high time but is friendly (approximately 1 day), and Ac treatment is less time-consuming (about 25 min) but harmful to the environment and causes the corrosion of equipment.In conclusion, combined treatment can be the best method and the high time required can be reduced with the progress of the research.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 4; 376--383
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of biological activities of two essential oils as a safe environmental bioinsecticides: case of Eucalyptus globulus and Rosmarinus officinalis
    Autorzy:
    Ainane, Ayoub
    Abdoul-Latif, Fatouma M.
    Abdoul-Latif, Talal M.
    Ainane, Tarik
    Powiązania:
    https://bibliotekanauki.pl/articles/1064777.pdf
    Data publikacji:
    2020
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    Eucalyptus globulus
    Rosmarinus officinalis
    essential oils
    insecticidal activity
    microbial activity
    Opis:
    All works of this article were conducted to investigate chemical composition and insecticidal and antimicrobial properties of Eucalyptus globulus and Rosmarinus officinalis essential oils isolated by hydro-distillation of its aerial parts. Analysis of the essential oils on the basis of gas chromatography and mass spectrometry (GC/FID and GC/MS) revealed the presence of 82 organic volatiles representing 98.63% of the total constituents of Eucalyptus globulus and the presence of 45 organic volatiles representing 98.53% of the total constituents of Rosmarinus officinalis. The major compounds for Eucalyptus globulus were estragole (28.14%), terpinolene (7.12%), 1,4-hexadiene-5-methyl-3-(1-methylethylidene) (7.01%), linalool (5.54%) and furfural (4.66%) and for Rosmarinus officinalis were (-)-camphor (31.16%) and ß-caryophyllene (18.55%), 3,4-dimethyl-(Z,Z)-2,4-Hexadiene (9.08%), ?-fenchene (4.67%), cis-verbenone (4.33%) and Bornyl acetate (3.4%). The efficacy of the two essential oils was evaluated on the insect pests Sitophilus granarius of wheat and was remarkable with lethal doses of 50% tending towards 1 µL·cm–3. The broth microdilution method as a complementary test was conducted to test the antimicrobial activity of the essential oil against: Staphylococcus aureus, Enterococcus faecium, Listeria monocytogenes, Bacillus subtilis, Escherichia coli, Yersinia enterocolitica, Pseudomonas aeruginosa and Candida albicans, further for the two oils of shows promising activity against all strains.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2020, 29, 4; 544-556
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leczenie zapalenia samotnego uchyłka jelita ślepego – doświadczenie z jednego ośrodka
    Autorzy:
    Gonullu, Emre
    Yigit, Merve
    Mantoglu, Baris
    Capoglu, Recayi
    Harmantepe, Tarik
    Gunduz, Yasemin
    Altintoprak, Fatih
    Bayhan, Zulfu
    Erkorkmaz, Unal
    Powiązania:
    https://bibliotekanauki.pl/articles/1391659.pdf
    Data publikacji:
    2021
    Wydawca:
    Index Copernicus International
    Tematy:
    appendektomia
    ostre zapalenie wyrostka robaczkowego
    uchyłek jelita ślepego
    zapalenie uchyłka jelita ślepego
    zapalenie uchyłków
    Opis:
    Wstęp: Zapalenie uchyłka jelita ślepego może być faktycznym czynnikiem etiologicznym odpowiedzialnym za ok. 1/300 zabiegów appendektomii. Diagnostyka różnicowa ostrego zapalenia wyrostka robaczkowego i zapalenia uchyłka jelita ślepego ma kluczowe znaczenie z uwagi na różnice w leczeniu obu tych schorzeń. Cel: Celem niniejszej pracy jest ujawnienie znaczenia rozróżnienia między ostrym zapaleniem wyrostka robaczkowego a zapaleniem uchyłka jelita ślepego. Materiał i metody: Wykonano retrospektywną analizę danych pochodzących od pacjentów poddawanych w latach 2015–2019 hospitalizacji w związku z następczym ostatecznym rozpoznaniem choroby uchyłkowej jelita grubego, zapalenia uchyłków jelita grubego lub ostrego zapalenia wyrostka robaczkowego. Wyniki: W trakcie zabiegu chirurgicznego wykonywanego w związku z ostrym zapaleniem wyrostka robaczkowego lub też w trakcie oceny klinicznej i radiologicznej wykryto łącznie 19 przypadków zapalenia uchyłka jelita ślepego. Dokonano oceny 1247 zabiegów appendektomii. W tej liczbie ostateczne rozpoznanie zapalenia uchyłka jelita ślepego postawiono u 5 pacjentów (0,4%). Ocenie poddano również 119 osób z rozpoznaniem zapalenia uchyłków jelita grubego w momencie rozpoznania; 105 pacjentów (88,2%) w tej grupie cierpiało na lewostronne zapalenie uchyłków, zaś 14 (11,7) na zapalenie samotnego uchyłka jelita ślepego. Wszystkich chorych z zapaleniem samotnego uchyłka jelita ślepego poddano leczeniu zachowawczemu, z wyjątkiem jednego, u którego stwierdzono zapalenie uchyłka stopnia 3 w skali Hincheya. Wniosek: Różnicowe rozpoznawanie zapalenia uchyłka jelita ślepego i ostrego zapalenia wyrostka robaczkowego ma znaczenie, ponieważ pierwsze z wymienionych schorzeń można w większości przypadków leczyć zachowawczo. Znaczenie tego rozpoznania dla zapobieżenia zbędnym interwencjom chirurgicznym rośnie szczególnie w okresie pandemii COVID-19.
    Źródło:
    Polish Journal of Surgery; 2021, 93, 4; 15-20
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy Metals Analysis and Quality Evaluation in Drinking Groundwater around an Abandoned Mine Area of Ouichane (Nador’s Province, Morocco)
    Autorzy:
    Moubchir, Tarik
    Eloutassi, Noureddine
    Bendaoud, Ahmed
    Belkhiri, Abdelkhalek
    Maai, Mohamed
    Moubchir, Majida
    Zahir, Ilham
    Powiązania:
    https://bibliotekanauki.pl/articles/24201772.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    contamination
    pollution index
    heavy metals
    water quality
    mining site
    Ouichane region
    Opis:
    The eventual polluting of the Ouichane region’s groundwater by heavy metals around an abandoned iron mine was investigated. To reach this aim, the research began with a questionnaire survey to assess local people’s use of and appreciation for well and spring water, followed by measurement of spatial pollution load of heavy metals: Al, Ag, Fe, Cd, As, Cr, Co, Zn, Pb and Cu for water samples collected from twelve wells and three spring drinks of water using inductively coupled plasma-atomic emission spectrometry method (ICP). Determining the overall quality of spring and well water for human use was also performed by calculating the heavy metal pollution index (HPI). As result, the survey revealed that 44.90% of the households are not connected to the drinking water network, 97.3% of them use well water, which is highly appreciated, and 88.1% of the population consider its quality to be good to excellent. Meanwhile, the ICP analysis showed that all the water samples contain heavy metals. In fact, the maximum concentrations (expressed in 10-5 g/l) recorded per element were 9.7 for (Ag), 15 for (Al), 6.9 for (As), 4.5 for (Cd), 5.6 for (Co), 31 for (Cr), 14 for (Cu), 858 for (Fe), 7 for (Pb) and 2.9*10-5 g/l for (Zn). Moreover, most of the water samples recorded heavy metal values above World Health Organization (WHO) limits, for at least one metal among the ten tested, with high concentrations of iron observed in all samples. The HPI values for the three explored sources (S1, S2 and S3) and for 8 out of 12 wells (P3, P4, P5, P6, P7, P8, P9 and P10) exceed the critical pollution value and identify non-potable water with a high potential of contamination. Consequently, the results of this study raise the question about groundwater around this abandoned mining area, especially in the long term, the use of groundwater could increase because of the succession of years of drought on Moroccan territory and hence may constitute a significant health risk for most of the inhabitants.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 5; 118--127
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cactus and Holm Oak Acorn for Efficient Textile Wastewater Treatment by Coagulation-Flocculation Process Optimization Using Box-Benhken Design
    Autorzy:
    Adachi, Abderrazzak
    Soujoud, Radouane
    El Ouadrhiri, Faiçal
    Tarik, Moubchir
    Hmamou, Anouar
    Eloutassi, Noureddine
    Lahkimi, Amal
    Powiązania:
    https://bibliotekanauki.pl/articles/24202904.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    coagulation-flocculation
    textile wastewater
    response surface methodology
    decolorization
    cactus
    holm oak acorn
    Opis:
    In this study, the effectiveness of using natural bio-coagulants and bio-flocculants to treat textile wastewater through the coagulation-flocculation method was examined. These bio-based agents have several advantages over chemical agents, including biodegradability, natural abundance, low toxicity, and low cost. A bio-coagulant (holm oak acorn (HOA)) and a bio-flocculant (cactus juice) were used to investigate the capacity for turbidity removal and decolorization of textile wastewater. The UV spectrophotometer was used to characterize the discharges before and after treatment, and the chemical oxygen demand (COD) and biological oxygen demand (BOD5) levels were calculated. Box-Behnken design (BBD) coupled with response surface methodology (RSM) were utilized to optimize the process and reduce turbidity and decolorization in textile wastewater. The obtained results show that under the optimal conditions (0.5 g•L-1 of HOA, 15 mL•L-1 of cactus juice, and a pH of 7), decolorization and turbidity removal were achieved at 69% and 90%, respectively. This study demonstrates the potential of using bio-coagulants and bio-flocculants in the treatment of textile wastewater.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 6; 315--328
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid feature selection and support vector machine framework for predicting maintenance failures
    Autorzy:
    Tarik, Mouna
    Mniai, Ayoub
    Jebari, Khalid
    Powiązania:
    https://bibliotekanauki.pl/articles/30148252.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    predictive maintenance
    machine learning
    features selection
    SMOTE-Tomek
    Support Vector Machine
    Opis:
    The main aim of predictive maintenance is to minimize downtime, failure risks and maintenance costs in manufacturing systems. Over the past few years, machine learning methods gained ground with diverse and successful applications in the area of predictive maintenance. This study shows that performing preprocessing techniques such as over¬sampling and feature selection for failure prediction is promising. For instance, to handle imbalanced data, the SMOTE-Tomek method is used. For feature selection, three different methods can be applied: Recursive Feature Elimination, Random Forest and Variance Threshold. The data considered in this paper for simulation are used in literature. They are used to measure aircraft engine sensors to predict engine failures, while the prediction algorithm used is a Support Vector Machine. The results show that classification accuracy can be significantly boosted by using the preprocessing techniques.
    Źródło:
    Applied Computer Science; 2023, 19, 2; 112-124
    1895-3735
    2353-6977
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliable energy supply and voltage control for hybrid microgrid by PID controlled with integrating of an EV charging station
    Autorzy:
    Nasri, Elmehdi
    Jarou, Tarik
    Benchikh, Salma
    El Koudia, Younes
    Powiązania:
    https://bibliotekanauki.pl/articles/27313830.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    PID controller
    DC microgrid
    energy supply reliability
    renewable energy system
    EV charging station
    regulator PID
    niezawodność systemów zasilania
    energia odnawialna
    stacja ładowania
    Opis:
    The integration of an electric vehicle (EV) charging station into the DC-microgrid requires management control of the energy supply and the voltage variation. The hybrid energy sources of the microgrid consist of battery storage, wind energy, and photovoltaic (PV) energy sources. To optimize power generation from renewable energy sources such as wind and PV, the source-side converters (SSCs) are regulated by the leading edge intelligent PID technique. This strategy enhances the quality of power delivered to the DC-microgrid. The microgrid comprises AC/DC loads, battery storage, EV charging stations, backup power from the main grid, and renewable energy supplies comprising wind and solar energy. The proposed control system relies on monitoring the state of charge of the battery and utilizing renewable energy sources to supply loads efficiently. The final results of the simulation obtained from the simulation software MATLAB and Simulink are used to validate the effectiveness of the suggested energy control technique, which performs well in terms of accurate control and maintaining a stable energy supply even under various load and weather conditions.
    Źródło:
    Diagnostyka; 2023, 24, 4; art. no. 2023409
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spiro-cyclotriphosphazene with three functional end groups: synthesis and structural characterization of new polycyclotriphosphazenes with Schiff-base groups
    Spiro-cyklotrifosfazen z trzema funkcyjnymi grupami końcowymi: synteza i charakterystyka struktury nowych policyklotrifosfazenów z grupami zasad Schiffa
    Autorzy:
    Al-Shukri, Salah Mahdi
    Mahmood, Ayad Tarik
    Al Hanbali, Othman A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1790060.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    spirocyclotriphosphazene
    polycyclophosphazene
    poly(schiff-base)
    thermal stability
    flame retardancy
    spirocyklotrifosfazen
    policyklofosfazen
    poli(zasada Schiffa)
    stabilność termiczna
    ognioodporność
    Opis:
    A new tris-spiro-(3,4-dioxybenzaldehyde)cyclotriphosphazene [PNCHO] was synthesized from the condensation of hexachlorocyclotriphosphazene with 3,4-dihydroxybenzaldehyde in the presence of strong base. Further reaction of the trialdehydic cyclotriphosphazene based molecules [PNCHO] with three different dianilines (benzidine, 4,4’-methylenedianiline and 4,4′-Sulfonyldianiline) resulted in creation of a new poly(tris-spiro-3,4-dioxbenzene)cyclotriphosphazenes with Schiff-base groups [PNSB1-3]. The structures of [PNCHO] and the polycyclotriphosphazenes-schiff base derivatives were characterized by means of FTIR, 1H, 13C NMR and C.H.N elemental analysis. Differential scanning calorimetery (DSC) revealed a relatively high glass transition temperature (135−175°C) of obtained polymers. Thermal gravimetric analysis (TGA) exhibited their good thermal stability (up to 375°C). The char yield was about 36–42% at 700°C. All polymers were self-extinguishable as the LOI (Limiting Oxygen Index) values were above 26% and this meets with the V-0 and V-1, classification (UL-94). No fumes, soot, or toxic gases emission were observed during burning. The polymers obtained can be used as environmentally friendly, flame-retardant materials.
    Nowy tris-spiro-(3,4-dioksybenzaldehydo)cyklotrifosfazen [PNCHO] zsyntetyzowano w procesie kondensacji heksachlorocyklotrifosfazenu z 3,4-dihydroksybenzaldehydem w obecności silnej zasady. W wyniku reakcji trialdehydo cyklotrifosfazenów z trzema różnymi dianilinami (benzydyna, 4,4’-metylenodianilina i 4,4’-sulfonylodianilina) otrzymano poli(tris-spiro-3,4-dioksabenzeno)cyklotrifosfazeny z zasadami Schiffa [PNSB1-3]. PNCHO i pochodne policyklotrifosfazen-zasady Schiffa scharakteryzowano za pomocą analizy elementarnej (C, H, N), FTIR, 1H, 13C NMR. Metodą różnicowej kalorymetrii skaningowej (DSC) wykazano wysoką temperaturę zeszklenia (135−175°C) otrzymanych polimerów. Metodą analizy termograwimetrycznej (TGA) potwierdzono ich dobrą stabilność termiczną (do 375°C). Stopień zwęglenia po spaleniu wynosił w temp. 700°C ok. 36–42%. Wszystkie polimery były samogasnące, ponieważ wartości LOI (Limiting Oxygen Index) przekraczały 26%, co odpowiada klasie palności V-0 i V-1 (UL-94). Podczas spalania nie zaobserwowano emisji oparów, sadzy ani toksycznych gazów. Otrzymane polimery mogą znaleźć zastosowanie jako przyjazne dla środowiska materiały trudnopalne.
    Źródło:
    Polimery; 2021, 66, 6; 341--349
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hybrid model for modelling the salinity of the Tafna River in Algeria
    Hybrydowy model służący modelowaniu zasolenia rzeki Tafna w Algierii
    Autorzy:
    Houari, Khemissi
    Hartani, Tarik
    Remini, Boualem
    Lefkir, Abdelouhab
    Abda, Leila
    Heddam, Salim
    Powiązania:
    https://bibliotekanauki.pl/articles/292367.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Adaptive-Network-Based Fuzzy Inference System (ANFIS)
    hybrid model
    neuro-fuzzy
    salinity
    salt flow
    Tafna River
    model hybrydowy
    przepływ soli
    rzeka Tafna
    system neuronowo-rozmyty
    system wnioskowania rozmytego (ANFIS)
    zasolenie
    Opis:
    In this paper, the capacity of an Adaptive-Network-Based Fuzzy Inference System (ANFIS) for predicting salinity of the Tafna River is investigated. Time series data of daily liquid flow and saline concentrations from the gauging station of Pierre du Chat (160801) were used for training, validation and testing the hybrid model. Different methods were used to test the accuracy of our results, i.e. coefficient of determination (R2), Nash–Sutcliffe efficiency coefficient (E), root of the mean squared error (RSR) and graphic techniques. The model produced satisfactory results and showed a very good agreement between the predicted and observed data, with R2 equal (88% for training, 78.01% validation and 80.00% for testing), E equal (85.84% for training, 82.51% validation and 78.17% for testing), and RSR equal (2% for training, 10% validation and 49% for testing).
    W pracy badano zdolność systemu wnioskowania rozmytego opartego na adaptacyjnej sieci (ANFIS) do przewidywania zasolenia rzeki Tafna. Do trenowania, oceny i testowania modelu hybrydowego wykorzystano serie pomiarów dobowych przepływów płynu i stężeń soli ze stacji pomiarowej w Pierre du Chat (160801). Dokładność wyników testowano za pomocą: współczynnika determinacji (R2), współczynnika wydajności Nasha–Sutcliffe’a (E), pierwiastka średniego błędu kwadratowego (RSR) i technik graficznych. Model dał zadowalające wyniki i wykazywał dobrą zgodność między danymi obserwowanymi a przewidywanymi: R2 (88% w przypadku uczenia sieci, 78.01% walidacji i 80.00% testowania), E (85.84% w przypadku uczenia sieci, 82.51% walidacji i 78.17% testowania) i RSR (2% w przypadku uczenia sieci, 10% walidacji i 49% testowania).
    Źródło:
    Journal of Water and Land Development; 2019, 40; 127-135
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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