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    Wyświetlanie 1-14 z 14
    Tytuł:
    Exploitation of industrial solid wastes for preparing zeolite as a value-added product and its kinetics as adsorbent for heavy metal ions
    Autorzy:
    Abdel-Hameed, Reham Mohamed
    Abdel-Aal, Elsayed A.
    Farghaly, Fatma E.
    Ibrahim, Ibrahim A.
    Abdel Khalek, Mohamed A.
    Ahmed, Mohamed A.
    Abdel-Messih, Micheal F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1448799.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zeolite P
    aluminium wastes
    hydrothermal process
    metal ion removal
    aluminum waste
    Opis:
    Aluminum and fumed silica as solid industrial wastes were converted to zeolite NaPas a value-addedproduct without any template. The hydrothermal process was optimized using static autoclave. The crystallization was carried out at 100, 120 and 150°C for 24, 48 and 72 h. The prepared zeolite of Si:Al ratio of 1.2 was characterized using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) provided with Energy Dispersive Spectroscopy (EDS), Surface Area, Fourier Transmitted Infra-Red (FTIR) and Thermal Analysis (TG-DSC). The crystalline phase was formed at 100°Cafter 72 hours and at 120°C after 48 hours, while it was formed after 24 honlyat 150°C. Increasing temperature and time lead to the conversion of the prismatic gibbsite crystals into plate-like structure of zeolitewhich is then formedcauliflower-like structure.The prepared zeolite was employed as adsorbent for $Ni^{2+}$ and $Cu2+ions from aqueous solution.The kinetic studies of adsorption processes were performed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 87-99
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compact Transverse Electric Silicon-on-Insulator Mode Converter for Mode-Division Multiplexer
    Autorzy:
    Sharaf, Mohamed H.
    El-Mashade, Mohamed B.
    Emran, Ahmed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055263.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    integrated optics
    silicon-on-insulator waveguide
    WDM & MDM systems
    perturbation theory
    integrated optical
    devices
    hybrid modes
    guided waves
    Opis:
    On-chip optical-interconnect technology emerges as an attractive approach due to its ultra-large bandwidth and ultra-low power consumption. Silicon-on-insulator (SOI) wire waveguides, on the other hand, have been identified to potentially replace copper wires for intra-chip communication. To take advantage of the wide bandwidth of SOI waveguides, wavelengthdivision multiplexing (WDM) has been implemented. However, WDM have inherent drawbacks. Mode-division multiplexing (MDM) is a viable alternative to WDM in MIMO photonic circuits on SOI as it requires only one carrier wavelength to operate. In this vein, mode converters are key components in on-chip MDM systems. The goal of this paper is to introduce a transverse electric mode converter. The suggested device can convert fundamental transverse electric modes to first-order transverse electric ones and vice versa. It is based on small material perturbation which introduces gradual coupling between different modes. This device is very simple and highly compact; the size of which is 3 μm². Mathematical expressions for both the insertion loss and crosstalk are derived and optimized for best performance. In addition, three-dimensional finite-difference time-domain (3D-FDTD) simulations are performed in order to verify the mathematical model of the device. Our numerical results reveal that the proposed device has an insertion loss of 1.2 dB and a crosstalk of 10.1 dB. The device’s insertion loss can be decreased to 0.95 dB by adding tapers to its material perturbation.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 2; 275--280
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    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:
    Potential Application of Used Coffee Grounds in Leather Tanning
    Autorzy:
    Nasr, Ahmed I.
    El Shaer, Mohammed A.
    Abd-Elraheem, Mohamed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201785.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    leather properties
    tannins
    vegetable tanning
    Opis:
    Safety of environment and human health is an essential requirement of modern industrial techniques. Therefore, using natural agents in tanning industry may emerge as a trusted method to avoid the chemical contamination caused by using traditional chromium salts in tanning process. This study aimed to evaluate the hot water extract of used coffee grounds (UCGs) as a vegetable tanning agent. The collected UCGs were dried and extracted with hot water at 90 °C for 2h. The phytochemical screening properties of UCGs extract were determined. Sufficient amount of extract was prepared to be used in leather tanning. Three groups were tanned with UCGs extract solely at concentrations of 20, 30 or 40% of pelts’ weight, while another three groups were tanned with the same concentrations and then re-tanned with 10% of a synthetic tanning agent “Phenol sulfonates”. On tanned leathers, organoleptic, physical and chemical properties were determined; scanning electron micrographs were depicted to examine the leather surface and collagen fiber bundles. Analysis of UCGs extract revealed that it has good tanning properties, as it contained tannins (14.92%), tannins/non tannins ratio (2.06), hide powder (39.57) and Stiasny number (21.16). The results of leather properties showed that using UCGs extract alone at concentration of 40% achieved the best results for the vegetable tanning where the tanned leather had higher (P<0.05) tensile strength, tearing strength and shrinking temperature than that treated with the lower level of 20% UCGs extract. However, 40% of UCGs extract is highly recommended to be used to accomplish the required shrinkage temperature that should be ≥ 70 °C. UCGs extract could be successfully used as tanning agent in vegetable tanning to produce durable leathers with good fullness; it may be used for different manufacturing products, such as footwear and bags. Moreover, using a combination of UCGs extract at any of the used concentrations with phenol sulfonates 10% led to significant improvement in all studied traits as compared with using UCGs extract alone.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 10--19
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    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:
    Thermodynamic assessment of thermochemical cycle for hydrogen production based on water decomposition with binary copper chlorine couple
    Autorzy:
    Benbrika, Omar
    Bensenouci, Ahmed
    Tegar, Mohamed
    Ismail, Kamal R.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2204067.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydrogen production
    thermochemical process
    copper-chlorine cycle
    water
    dissociate
    exergy
    energy
    analys
    Opis:
    The present study aims at investigating and simulating the hydrogen cycle production at low temperatures using thermochemical reactions. The cycle used in this work is based on the dissociation of water molecules depending on a copper chlorine couple. Furthermore, the proposed method uses mainly thermal energy provided by a solar thermal field. This proposed cycle differs from what is found in the literature. However, most of the thermochemical cycles for hydrogen production work at quite high temperatures which is a technical challenge. Therefore, the maximum temperature used in the present cycle is limited to 500◦C. A thermodynamic analysis based on both the first and second laws is performed to evaluate the energy, exergy and efficiency of each reaction as well as the overall exergetic efficiency of the system. Furthermore, a parametric study is conducted to figure out the impact of the surrounding temperatures on the overall exergetic efficiency using commercial energy simulation software. The results show that the cycle can achieve an exergy efficiency of 30.5%.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 4; 109--133
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential toxicity assessment of novel selected pesticides against sand termite, Psammotermes hypostoma Desneux workers (Isoptera: Rhinotermitidae) under field conditions in Egypt
    Autorzy:
    Ahmed, M.A.I.
    Eraky, E.-S.A.
    Mohamed, M.F.
    Soliman, A.-A.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/66459.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The sand termite, Psammotermes hypostoma Desneux is a major pest in the New Valley Governorate, Egypt. Great efforts have been taken to control the pest. We evaluated the toxicity of four selected neonicotinoids [acetamiprid (20% SP), imidacloprid (20% SL), thiamethoxam (18.6% SC), and thiamethoxam (40% WG)], and one organophosphate pesticide [chlorpyrifos (48% EC)] against P. hypostoma workers. The investigation was done under field conditions, using the palm fronds method. However, the reduction percentages in palm fronds was recorded as the height of the sandy clay formed by termite workers on palm frond surfaces, when the fronds had been treated with a different concentration of each pesticide. The results were recorded after 15, 30, 45, and 60 days. Chlorpyrifos (48% EC) was considered the most potent pesticide among all the pesticides tested, but acetamiprid (20% SP) was considered the most toxic among the neonicotinoid pesticides tested. Moreover, the formulation of thiamethoxam (18.6% SC) was more powerful than thaimethoxam (40% WG). Furthermore, the reduction percentages on palm fronds increased significantly with an increase of the exposure period (from 15 to 60 days), as a result of the surface foraging activity of the sand termite workers. These results are given as unique and encouraging trends in controlling sand termites in Egypt.
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risk factors for futile tracheostomy: an analysis of the NIS database
    Czynniki ryzyka daremnej tracheostomii: analiza bazy danych NIS
    Autorzy:
    Ahmed, Amin Mohamed
    Arishi, Abdulaziz A
    Loss, Lindsey
    Parsikia, Afshin
    Ortiz, Jorge
    Powiązania:
    https://bibliotekanauki.pl/articles/1033285.pdf
    Data publikacji:
    2020
    Wydawca:
    Towarzystwo Pomocy Doraźnej
    Tematy:
    Critical care
    complication
    mortality
    risk factors
    tracheostomy
    Opis:
    INTRODUCTION: Respiratory insufficiency and failure are leading causes of ICU admissions. Advances in medical technology allow prolonging of survival in critical illnesses. Hence, more tracheostomies are being performed. However, we are limited in predicting who may actually benefit. Our goal was to determine prognostic indicators of early mortality after tracheostomy in order to avoid futile procedures. MATERIAL AND METHODS: We performed a retrospective cohort study utilizing the National Inpatient Sample (NIS) database on all adults who underwent tracheostomy between 2005 and 2015. We defined futile tracheostomy as death within 30 days post tracheostomy during the same hospital admission. Univariate and multivariate testing were performed on the weighted dataset. Odds ratios (OR) were calculated with multivariate logistic regression testing. RESULTS: 851,020 cases met the inclusion criteria. Rate of futility was 12.4% (n=105,658). Total hospitalization cost was greater in the futile group as compared to non-futile group. On Multivariate testing, male gender, age greater than 65, 3 Elixhauser mortality index categories, Asian/Pacific Islander and other race, self-pay and no charge insurance, septicemia and mechanical ventilation greater than 96 hours were independent risk factors to predict futility. Among these, septicemia was the greatest risk for futility (OR 2.32), followed by Elixhauser mortality index >10 (OR 1.954), and Elixhauser mortality index between 3 and 10 (OR 1.468). CONCLUSIONS: Between 2005 and 2015, 12.4% of tracheostomies could be considered futile. Targeted efforts are needed to decrease the number of unnecessary procedures in the critically ill. We should consider the identified risk factors to share more informed discussions with patients and families to set better long-term expectations and realistic goals for care.
    WSTĘP: Zapaść krążeniowa i niewydolność oddechowa są głównymi przyczynami przyjęć na OIT. Postęp technolgii w medycynie pozwala na przedłużenie życia w stanach krytycznych. W związki z tym wykonuje się więcej zabiegów tracheostomii. Jednak istnieją ograniczenia w określeniu kto powinien być faktycznie poddany zabiegowi. Celem autorów było określenie prognostycznych wskaźników wczesnej śmiertelności po tracheostomii, aby uniknąć daremnych zabiegów. MATERIAŁ I METODY: Przeprowadzono retrospektywne badanie kohortowe z wykorzystaniem National Inpatient Sample (NIS) - bazy danych osób dorosłych, którzy przeszli tracheostomię w latach 2005–2015. Daremną tracheostomię określilono jako śmierć w ciągu 30 dni po tracheostomii podczas tego samego przyjęcia do szpitala. Testy jednowymiarowe i wielowymiarowe były przeprowadzane na ważonym zbiorze danych. Ilorazy szans (OR) obliczono za pomocą wieloczynnikowych testów regresji logistycznej. WYNIKI: 851,020 przypadków spełniło kryteria włączenia. Wskaźnik daremności wyniósł 12.4% (n = 105,658). Całkowity koszt hospitalizacji był większy w grupie daremnej w porównaniu z grupą nie-daremną. W testach wielowymiarowych, płeć męska, wiek powyżej 65, trzy kategorie wskaźnika śmiertelności Elixhausera, rasy azjatyckie / wyspiarskie i inne rasy, samodzielne i bezpłatne ubezpieczenie, posocznica i wentylacja mechaniczna dłuższa niż 96 godzin były niezależnymi czynnikami ryzyka, które wskazywały na daremność. Pośród tych przypadków posocznica była największym ryzykiem daremności (OR 2.32), a następnie wskaźnik śmiertelności Elixhausera > 10 (OR 1.954), oraz Wskaźnik śmiertelności Elixhausera między 3 a 10 (OR 1.468). WNIOSKI: W latach 2005-2015 12.4% tracheostomii można uznać za daremne. Ukierunkowane wysiłki są potrzebne do zmniejszenia liczby niepotrzebnych zabiegów u osób w stanie krytycznym. Powinniśmy wziąć pod uwagę zidentyfikowane czynniki ryzyka, aby dzielić się bardziej świadomymi dyskusjami z pacjentami i rodzinami w celu ustalenia lepszych i realistycznych długoterminowych oczekiwań opieki.
    Źródło:
    Critical Care Innovations; 2020, 3, 3; 1-12
    2545-2533
    Pojawia się w:
    Critical Care Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A two-stage stochastic programming approach for production planning system with seasonal demand
    Autorzy:
    Mahmoud, Asmaa A.
    Aly, Mohamed F.
    Mohib, Ahmed M.
    Afefy, Islam H.
    Powiązania:
    https://bibliotekanauki.pl/articles/952860.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    process manufacturing system
    two-stage stochastic programming
    sampling average approximation
    Opis:
    Seasonality is a function of a time series in which the data experiences regular and predictable changes that repeat each calendar year. Two-stage stochastic programming model for real industrial systems at the case of a seasonal demand is presented. Sampling average approximation (SAA) method was applied to solve a stochastic model which gave a productive structure for distinguishing and statistically testing a different production plan. Lingo tool is developed to obtain the optimal solution for the proposed model which is validated by Math works Matlab. The actual data of the industrial system; from the General Manufacturing Company, was applied to examine the proposed model. Seasonal future demand is then estimated using the multiplicative seasonal method, the effect of seasonality was presented and discussed. One might say that the proposed model is viewed as a moderately accurate tool for industrial systems in case of seasonal demand. The current research may be considered a significant tool in case of seasonal demand. To illustrate the applicability of the proposed model a numerical example is solved using the proposed technique. ANOVA analysis is applied using MINITAB 17 statistical software to validate the obtained results.
    Źródło:
    Management and Production Engineering Review; 2020, 11, 1; 31--42
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of ventilation to limit airborne infection concentration in an isolation room
    Autorzy:
    Kassem, Fatma A.-M.
    Abdelgawad, Ahmed Farouk
    Abu El-Ezz, A. E.
    Nassief, Mofreh M.
    Adel, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/24201035.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    COVID-19
    ventilation
    exhaled air
    air exchange
    test model
    hospital room
    CO2
    wentylacja
    powietrze wydychane
    sala szpitalna
    wymiana powietrza
    model badawczy
    Opis:
    Coronavirus (COVID-19) was detected at the end of 2019 and has since caused a worldwide pandemic. This virus is transferred airborne. In this study, an investigation was carried out of the ventilation strategies inside the isolation room based on exhaust air locations. To reduce the infection disease (COVID-19), due to the spreading of exhaled contaminants by humans in interior environments, five models for ventilation systems differing in the position of the outlet and inlet were used. This study aims to increase knowledge regarding the exhaled contaminant distribution under different environ-mental conditions (opening exhaust and negative pressure). The results showed a good agreement be-tween the computational results and the experimental data. Tracer gas CO2 was used to evaluate the air quality experimentally and computationally. The results showed that stable conditions are obtained inside the room at a negative pressure value above –1.5 Pa. The residence time of the infected airborne decreases when the pressure difference increases. The study revealed that the model with an air outlet opening installed behind the patient enabled avoiding the spread of infection in the room.
    Źródło:
    Environment Protection Engineering; 2023, 49, 2; 39--54
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seed Quality and Protein Classification of Some Quinoa Varieties
    Autorzy:
    Abd El-Hakim, Ahmed F.
    Mady, Emad
    Abou Tahoun, Ayman M.
    Ghaly, Mohammed S. A.
    Eissa, Mohamed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025743.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    quinoa
    seed vigour
    seed quality
    amino acids composition
    agro-climatic zone
    Opis:
    Quinoa plants, originating from the Andean mountains in South America, have a large scale of biological diversity. Along with the cultivation favorableness of quinoa, it reveals superior nutrition aspects. In comparison with cereal crops, like rice, maize, and wheat, quinoa seeds contain valuable quantities of protein of remarkable quality. The current study compared four quinoa cultivars from different origins in terms of protein composition and germinability. In addition, this study focused on the effect of different geographical cultivation areas on the protein composition of wild Egyptian quinoa seeds and three other cultivars that vary in their cultivation origins. Significant differences were observed among the quinoa varieties in the germination percentage (GP), shoot length (SL), and root length (RL). Using the technology of Near-InfraRed Spectroscopy, the highest protein value was recorded for the American variety (18.39%), followed by the Wild Egyptian variety (17.16%). The aromatic phenylalanine recorded the highest concentration of the essential amino acid bulk. The Rainbow variety contained 12.7 g-aa/kg protein, followed by the wild Egyptian variety with 4.9 g-aa/kg protein. In turn, glutamic was the most abundant amino acid of the non-essential amino acids, with 10.1, 4, 23.4, and 4 (g-aa/kg protein) for quinoa varieties, Wild Egyptian, American, Rainbow, Black, respectively. SDS-PAGE was used to identify the allelic variations in the seed storage protein profiles among the studied quinoa varieties. The studied quinoa varieties showed 23.81% of the polymorphism in the protein bands, with the mean band frequency of 0.881. The resulting protein bands fluctuated in the range between 115.02 and 16 kDa. With a similarity percentage (90%), Wild Egyptian and the Rainbow quinoa varieties can be classified in one clade.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 1; 24-33
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Different Processing Methods on the Behavior of Minerals Content in Food Products
    Autorzy:
    Alshallash, Khalid S.
    Shahat, Mohamed
    Ibrahim, Mohamed I.
    Hegazy, Ahmed I.
    Hamdy, Ashraf E.
    Elnaggar, Ibrahim A.
    El-Wahed, Abd El-Wahed N. Abd
    Taha, Ibrahim M.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201608.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    mineral
    fruit
    processing
    canning
    dehydration
    stewing
    Opis:
    The goal of the current study was to determine the mineral content of different fruit varieties (Na, K, Ca, P, Mg, Fe, Zn, and Cu), as well as the effects of various processing methods (such as canning, drying, stewing, syrup process, and concentration of juices). All tested fruits that were subjected to various types of processing were exposed to a degree of mineral loss, varying from very little to high reduction. However, it still retains its nutritional value. All fig products have the greatest levels of most tested minerals, compared to other processed fruit products, particularly P and Fe. In turn, orange products supply higher quantities of Ca. On the other hand, apricot products have a comparable value of other minerals with those found in fig and orange products. Among canned juices, guava had the highest contents of Ca, P, and Fe, while mango scored the first juice as Mg and Zn supplying. Canned apricot halves contain the best amounts of K, Ca, P and Mg than the same products of apple and peach. Among jam products, fig jam has higher amounts of Na, Ca, P, Mg, and Fe than those found in other fruit jams. The concentration of fruit juices by vacuum-heating or dehydration of fruit produced higher mineral retentions than the fruit products that were processed by other techniques. The concentrated orange juice by vacuum-heating processing retained most of the minerals found in raw juice, also dried apricot sheet retained higher minerals than those retained in dehydrated whole apricot.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 263--275
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioaccumulation of Heavy Metals in Mackerel and Red Hybrid Tilapia Collected From
    Autorzy:
    Dabwan, Ahmed H. A.
    Saluddin, Ummu Asma’ Hafifah Bt. Mohmad
    Isa, Nursuhaili Bt. Mohd
    Abdullah, Abdul Hadi
    Mohamed, Amri Bin Hj.
    Ahmad, Anuar Bin
    Powiązania:
    https://bibliotekanauki.pl/articles/27314829.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    heavy metals
    biomonitoring
    oreochromis niloticus
    Rastrelliger kanagurta
    Oreochromis niloticus
    metale ciężkie
    ekosystem morski
    makrela indyjska
    tilapia
    Opis:
    The major goal of this study is to determine the bioaccumulation of heavy metals in the tissues and bones of Red Hybrid Tilapia (Oreochromis niloticus) and Mackerel (Rastrelliger kanagurta) taken from two distinct sites in Terengganu state, Malaysia, namely Kijal and Paka. Zinc (Zn), copper (Cu), nickel (Ni), and lead (Pb)were the metals examined. Soil analysis also was carried out for the same elements. The tissues and bones of the fishes were separated before further analysis was made. Drying process technique was used to determine the moisture content for all samples at 80°C for 24 hours. Water content ranged between 70 & 77%. Triplicate samples were evaluated by using Atomic Absorption Spectrophotometer (AAS) to find out heavy metals concentration. Oven and Teflon beakers were used to fully digest all solid samples at 120oC for 3 hours. Highest readings of Zn, Ni and Pb were found in the fish bone for the samples collected from both mentioned locations. However, different pattern was noticed for Cu where higher values were found in the tissues for the same samples. Values of Pb in the tissues were higher than the acceptable value in edible fish by Food and Agriculture Organization (FAO); 1 ppm and Malaysian Food Act (MFR) & World Health Organization (WHO); 2 ppm, whereas values of Cu, Zn were in the acceptable range set by the same organizations. No values recommended for Ni by MFR. In general heavy metals in the bones and tissues from both locations can be sorted in descending order as follows; Pb>Zn>Cu>Ni. Soil samples collected from both locations showed different pattern where high concentration was found for Zn followed by Pb then Cu and Ni. Moreover analysis for soil samples collected from Paka River showed higher content for all elements compared to Kijal. More investigation is needed to clarify whether this contamination is solely from industry or due to geology of the area.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 4; 270--281
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron-transfer complexation of morpholine donor molecule with some π – acceptors: Synthesis and spectroscopic characterizations
    Autorzy:
    Al-Wasidi, Asma S.
    Al-Jafshar, Nawal M.
    Al-Anazi, Amal M.
    Alosaimi, Eid H.
    Refat, Moamen S.
    El-Zayat, Lamia
    Al-Omar, Mohamed A.
    Naglah, Ahmed M.
    El-Nour, K.M. Abou
    Powiązania:
    https://bibliotekanauki.pl/articles/778928.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Morpholine
    π-acceptor
    CT complex
    photometric titration
    infrared
    Benesi-Hildebrand
    Opis:
    Morpholine is an interesting moiety that used widely in several organic syntheses. The intermolecular charge-transfer (CT) complexity associated between morpholine (Morp) donor with (monoiodobromide “IBr”, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone “DDQ”, 2,6-dichloroquinone-4-chloroimide “DCQ” and 2,6-dibromoquinone-4-chloroimide “DBQ”) π–acceptors have been spectrophotometrically investigated in CHCl3 and/or MeOH solvents. The structures of the intermolecular charge-transfer (CT) were elucidated by spectroscopic methods like, infrared spectroscopy. Also, different analyses techniques such as UV-Vis and elemental analyses were performed to characterize the four morpholine [(Morp)(IBr)], [(Morp)(DDQ)], [(Morp)(DCQ)] and [(Morp)(DBQ)] CT-complexes which reveals that the stoichiometry of the reactions is 1:1. The modified Benesi-Hildebrand equation was utilized to determine the physical spectroscopic parameters such as association constant (K) and the molar extinction coefficient (ε).
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 4; 82-88
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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