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Wyświetlanie 1-15 z 2470
Tytuł:
Morbidity cost and willingness to pay for healthcare insurance among wheat farmers in Jigawa State of Nigeria
Autorzy:
Sadiq, M.S.
Ahmad, M.M.
Gama, E.N.
Sambo, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/29430964.pdf
Data publikacji:
2024
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2024, 24[39], 1; 4-25
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An efficient pedestrian attribute recognition system under challenging conditions
Autorzy:
Nguyen, Ha X.
Hoang, Dong N.
Tran, Tuan A.
Dang, Tuan M.
Powiązania:
https://bibliotekanauki.pl/articles/24200444.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Instytut Informatyki Technicznej
Tematy:
pedestrian attribute recognition
Deep Learning
vision transformer
security surveil-lance
Opis:
In this work, an efficient pedestrian attribute recognition system is introduced. The system is based on a novel processing pipeline that combines the best-performing attribute extraction model with an efficient attribute filtering algorithm using keypoints of human pose. The attribute extraction models are developed based on several state-of-the-art deep networks via transfer learning techniques, including ResNet50, Swin-transformer, and ConvNeXt. Pre-trained models of these networks are fine-tuned using the Ensemble Pedestrian Attribute Recognition (EPAR) dataset. Several optimization techniques, including the advanced optimizer Adam with Decoupled Weight Decay Regularization (AdamW), Random Erasing (RE), and weighted loss functions, are adopted to solve issues of data unbalancing or challenging conditions like partial and occluded bodies. Experimental evaluations are performed via EPAR that contains 26 993 images of 1477 person IDs, most of which are in challenging conditions. The results show that the ConvNeXt-v2-B outperforms other networks; mean accuracy (mA) reaches 85.57%, and other indices are also the highest. The addition of AdamW or RE can improve accuracy by 1-2%. The use of new loss functions can solve the issue of data unbalancing, in which the accuracy of data-less attributes improves by a maximum of 14% in the best case. Significantly, when the attribute filtering algorithm is applied, the results are dramatically improved, and mA reaches an excellent value of 94.85%. Utilizing the state-of-the-art attribute extraction model with optimization techniques on the large-scale and diverse dataset and attribute filtering has shown a good approach and thus has a high potential for practical applications.
Źródło:
Machine Graphics & Vision; 2023, 32, 2; 3--18
1230-0535
2720-250X
Pojawia się w:
Machine Graphics & Vision
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consumption of food supplements in the Fes-Meknes region, Morocco. Profiles and typology
Autorzy:
El Finou, H.
Salhi, N.
Zaid, A.
El Rhaffari, L.
Powiązania:
https://bibliotekanauki.pl/articles/28765339.pdf
Data publikacji:
2023
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Background. The consumption of food supplements is increasing. This evolution is due to several factors, including nutritional deficiencies in the population, a sedentary lifestyle, and a decrease in physical activity. In addition, stress and an active lifestyle led to several dysfunctions (fatigue, deconcentration) that food supplements can help to overcome. Objective. This study aimed to determine the profiles of food supplement consumers in the Fes-Meknes region (Morocco), distribution, and production of these products. In addition, this survey aimed to evaluate consumers’ knowledge of food supplements as part of their self-medication. Material and methods. The present study was conducted in the form of a survey using a questionnaire composed of two parts. The first part provides information on the socio-demographic status of respondents, including gender, age, and level of education. The second part concerned various information on the consumption of food supplements. Results. The results obtained showed that of the 498 subjects, 68.88% declared that they had already consumed the food supplements. The study revealed the predominance of the female gender at 69.68% and the age group 21-30 years (80.32%). Among the reasons for consumption, improving general health comes first with 56.29%. Our results also showed high consumption of vitamins (44.04%) and minerals (24.79%), next come proteins and plant extracts at 16.62% and 14.54% respectively. The consumption of food supplements is most often done on the advice of a doctor or dietician with 43.60%, and the pharmacy and para-pharmacy remains the main distribution channel at 75.78%. Conclusion. The present survey allowed us to update the current situation of food supplement consumption and a way of regulatory monitoring and more control for an organization of the sector.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2023, 74, 2; 159-165
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of High Entropy Alloy as Catalyst for Azo Dye Degradation in Fenton Process
Autorzy:
Hassan, Nur Hudawiyah Abu
Nasir, Nisa Syukrina Mat
Rahman, S. N. A.
Irfan, Abd Rahim
Nordin, Norhuda Hidayah
Powiązania:
https://bibliotekanauki.pl/articles/2203739.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
azo dye
catalyst
fenton process
high entropy alloys
HEAs
Opis:
Azo dye is widely used in the textile industry since it is cost effective and simple to use. However, it becomes a continuous source of environmental pollution due to its carcinogenicity and toxicity. Various methods had been used to remove the azo dye in solution. One of the famous and frequently used is the Fenton process. The Fenton process is one of the advanced oxidation processes where iron catalysed hydrogen peroxide to generate hydroxyl radical. Treating azo dyes in solution requires a catalyst to enhance the process of degradation. Herein, high entropy alloys (HEAs) have been proposed as a catalytic material to enhance the performance of Fenton process for azo dye degradation. HEAs have been reported as a promising catalyst due to its high surface area. The higher the number of active sites, the higher the rate of azo dye degradation as more active sites are available for adsorption of azo dyes. The results have shown that HEAs can be used as a catalyst to fasten the Fenton reaction since the degradation time is proven to be shorter in the presence of HEAs. The method derived from the result of this study will contribute in treating azo dyes for wastewater management in the Fenton process.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 209--213
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of SARS-CoV-2 infection on out-ofhospital cardiac arrest outcomes - systematic review and meta-analysis
Autorzy:
Krawczyk, A.
Szarpak, L.
Bragazzi, N.L.
Cander, B.
Feduniw, S.
Pruc, M.
Luszczki, J.
Chmielewski, J.
Kowalczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/28762637.pdf
Data publikacji:
2023
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2023, 30, 2; 369-375
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the physicochemical and hygienic quality of cow’s milk and its derivatives in El Jadida City, Morocco
Autorzy:
Ariri, N.
Aboukhassib, H.
Echarrafi, N.
Mannani, N.
Fitani, A.
Bitar, A.
Powiązania:
https://bibliotekanauki.pl/articles/28765536.pdf
Data publikacji:
2023
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Background. Despite the efforts and investments made for traceability and the guarantee of a fair and safe milk product, the informal sector threatens the safety of milk. In fact, during this circuit, the product does not undergo any treatment and therefore presents serious risks for the health of the consumer. In this context, studies have been carried out on samples of peddled milk and products derived from it. Objective. The purpose of this study is to evaluate the relevance of the informal circuit in Morocco's Doukkala region (El Jadida Province) by physicochemical and microbiological investigation of raw milk and its derivatives at various points of sale. Materials and method. 84 samples were taken between (23 for raw milk, 30 for the «Lben», and 31 for the «Raib») between January 1st, 2021 and October 30th, 2021. According to Moroccan rules, microbiological analyses revealed an extremely high non-compliance rate in most samples obtained at the level of outlets situated in the El Jadida region, with a non-compliance ratio of 65 percent for raw milk sold, 70 percent for the «Lben», and 40 percent for the «Raib». Results. Likewise, these analyses revealed that majority of the samples did not fulfill international criteria for the pH values of raw milk samples «Lben» and «Raib», which are respectively between 5.85 and 6.71; 4.14 and 4.43 and 4.5. Other characteristics, including lactose, proteins, fat, mineral salts, density, and additional water, have also yielded results. Conclusion. This has allowed us to analyze the major impact of the peddling circuit at the regional level, which is a risk factor for consumer health.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2023, 74, 1; 19-29
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expectations of maritime university students of future work on a ship
Autorzy:
Kłopotek, N.
Dmowski, P.
Szkieł, A.
Powiązania:
https://bibliotekanauki.pl/articles/24811494.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
maritime education
training of seafarers
the kano model
expectations of maritime students
requirements of seafarers
working on board
shipowner companies
personnel management
Opis:
The main goal of education at a maritime university is to provide students with knowledge and practical skills necessary for future work on a ship. To receive the diploma of merchant navy officer, students are required to complete a 12-month maritime internship. During the internship, as well as during the entire course of studies, students' expectations regarding their future professional work are developed, related to, among others, working and living conditions on a ship, employment conditions and cooperation with the shipowner. These expectations determine the students’ subsequent choices towards a given shipowner as a potential employer, as well as their decisions about further professional development in this field. From the point of view of operational management, it is therefore important for the shipowner to know the requirements that must be met in order to have a motivated and competent staff. This article aims to classify the requirements for students relative to their future work on a ship based on assessing the impact of the requirement fulfilment level against the level of their satisfaction. The results obtained made it possible to indicate those requirements regarding working conditions, the fulfilment of which should be treated by shipowners as a priority, because they determine the students’ satisfaction to the highest degree.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 702--706
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Features of clinical, biochemical, and sonographic parameters in patients with chronic viral hepatitis C with concomitant non-alcoholic fatty liver disease
Autorzy:
Izha, G.
Dragomiretska, N.
Gushcha, S.
Sierpińska, L.E.
Plakida, A.
Powiązania:
https://bibliotekanauki.pl/articles/28684399.pdf
Data publikacji:
2023
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2023, 30, 1; 49-54
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filtration of compressible viscous-plastic oil in a porous medium
Filtracja ściśliwego oleju lepkoplastycznego w medium porowatym
Autorzy:
Dadash-Zade, Mirza A.
Aliyev, Inglab N.
Powiązania:
https://bibliotekanauki.pl/articles/31343897.pdf
Data publikacji:
2023
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
deep-seated oil fields
compressibility
oil basin
reservoir
physical properties
chemical properties
oil
porosity
permeability
głęboko zalegające złoża ropy
ściśliwość
basen naftowy
zbiornik
właściwości fizyczne
właściwości chemiczne
ropa
porowatość
przepuszczalność
Opis:
Numerous laboratory studies have shown that the change in physical and chemical properties and the geological conditions of the occurrence of hydrocarbons depend on depth. It should be noted that the change in oil properties with depth and the identification of the properties of such oils are poorly understood. In this research work, an attempt is made to study the filtration properties of anomalous oils, taking into account compressibility in reservoir conditions. The work carried out shows that the density, dynamic viscosity and the content of resins, sulfur, paraffin and asphaltene of different oil reservoirs are mainly depth dependent. The filtration characteristics of such oils that manifest themselves at a given pressure have been established. The results of modeling the filtration processes leading to the emergence of zones of increased oil compressibility, forming deep hydrocarbon fields, were used to discuss the regularities obtained. This makes it possible to determine filtration characteristics of anomalous liquid, taking into account the compressibility, which determine their higher quality indicators. The analysis shows that in the development of oil fields with anomalous properties of hydrocarbons, when recalculating the volumetric flow rate of individual wells in reservoir conditions it is necessary to use the value of the volumetric oil coefficient, taking into account its non-Newtonian properties. This technique will enable future works to study the effect of hydrodynamic imperfection of wells and the effect of formation permeability violation in their bottomhole zone on the reservoir pressure redistribution characteristics and well test results.
Liczne badania laboratoryjne wykazały, że zmiana właściwości fizycznych i chemicznych oraz warunki geologiczne występowania węglowodorów zależą od głębokości usytuowania akumulacji. Należy zauważyć, że charakter zmiany właściwości ropy naftowej wraz z głębokością jest słabo rozpoznany. W niniejszej pracy podjęto próbę zbadania właściwości filtracyjnych rop anomalnych, biorąc pod uwagę ściśliwość w warunkach złożowych. Przeprowadzone prace wykazały, że gęstość, lepkość dynamiczna oraz zawartość żywic, siarki, parafiny i asfaltenów w różnych złożach ropy naftowej zależą głównie od głębokości. Określono właściwości filtracyjne tych rop, ujawniające się przy określonym ciśnieniu. Do omówienia uzyskanych prawidłowości wykorzystano wyniki modelowania procesów filtracji, prowadzących do powstania stref o zwiększonej ściśliwości ropy w głębokich złożach węglowodorów. Pozwala to na ustalenie charakterystyki filtracyjnej cieczy anomalnej z uwzględnieniem ściśliwości, które determinują ich wyższe wskaźniki jakościowe. Analiza pokazuje, że przy zagospodarowaniu złóż ropy naftowej o anomalnych właściwościach, przy przeliczaniu objętościowego natężenia przepływu poszczególnych odwiertów w warunkach złożowych, konieczne jest wykorzystanie wartości współczynnika objętościowego ropy, z uwzględnieniem jego właściwości nienewtonowskich. Technika ta umożliwia w przyszłych pracach badanie wpływu niedoskonałości hydrodynamicznej odwiertów i wpływu naruszenia przepuszczalności formacji w strefie przyodwiertowej na cechy redystrybucji ciśnienia złożowego, jak również na wyniki opróbowania odwiertów.
Źródło:
Nafta-Gaz; 2023, 79, 6; 406-411
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hazard identification and risk assessment methods used in the oil and gas industry
Metody identyfikacji zagrożeń i ocen ryzyka używane w przemyśle naftowym i gazowniczym
Autorzy:
Bogopolsky, Vadim O.
Shirinov, Magomed M.
Samedov, Vugar N.
Bagirov, Azad A.
Powiązania:
https://bibliotekanauki.pl/articles/31348296.pdf
Data publikacji:
2023
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
degree of risk
risk assessment
Pareto principle
bow tie analysis
dangerous events
unfavourable consequences
stopień ryzyka
ocena ryzyka
zasada Pareta
analiza bow tie
zdarzenie niebezpieczne
niekorzystne konsekwencje
Opis:
The article discusses the preparation and implementation of a complete comprehensive safety assessment of a hazardous production facility, such as environmental risk management, the risks of designing and operating enterprises, taking into account the human factor, engineering psychology, the development of labour protection management systems and other risks. When assessing risks when implementing various processes, for example, the transport support of offshore fields, it makes sense to prepare a comprehensive safety assessment of the individual operational structures. In this case, bow tie analysis is used to examine risk by demonstrating a range of possible causes and effects. The method should be applied in a situation where it is difficult to perform a complete fault tree analysis or where the research is more focused on creating barriers or controls for each failure path. The methodology for this analysis is the same as preparing and implementing an HSE for whole enterprise. The possibility to apply the Pareto principle to estimate technogenic risk parameters of composite systems was studied. According to the Pareto principle there are a few important parameters among many unimportant ones. Hence, the main success is achieved not by the many actions, but the few. This is applicable to a wide range of research areas, including manufacturing, economical and physical ones. In a bow tie diagram, some calculations may be applied for example, in a situation where the paths are independent and the probability of certain outcomes is known. Such a quantitative assessment is necessary to ensure the effectiveness of control.
Artykuł omawia przygotowanie i realizację pełnej, kompleksowej oceny bezpieczeństwa potencjalnie niebezpiecznej instalacji produkcyjnej, obejmujące zarządzanie ryzykiem środowiskowym, ryzyko związane z projektowaniem i prowadzeniem przedsiębiorstw, uwzględniając czynnik ludzki, psychologię inżynierii, rozwój systemów zarządzania ochroną pracy oraz inne rodzaje ryzyka. Przy ocenie ryzyka jako części realizacji różnych procesów, na przykład wsparcia transportowego na złożach morskich, istotne jest przygotowanie wszechstronnej oceny bezpieczeństwa poszczególnych obiektów eksploatacyjnych. W tym przypadku stosowana jest analiza „bow tie”, aby zbadać ryzyko poprzez wykazanie zakresu możliwych przyczyn i skutków. Metodę tę należy stosować w sytuacji, gdy trudno jest wykonać kompletną analizę drzewa błędów lub gdy badania są bardziej skoncentrowane na tworzeniu barier lub czynników kontrolnych dla każdej ścieżki awarii. Metodologia tej analizy jest taka sama jak w przypadku przygotowania i wdrażania analizy HSE dla całego przedsiębiorstwa. Zbadano możliwość zastosowania zasady Pareta, aby oszacować parametry ryzyka technologicznego dla systemów złożonych. Zgodnie z zasadą Pareta istnieje kilka parametrów ważnych i wiele nieważnych. Tak więc główny sukces osiągany jest nie poprzez wiele działań, ale przez niewiele. Ma to zastosowanie w wielu obszarach badawczych, w tym w produkcji, ekonomii i fizyce. Na wykresie „bow tie” niektóre obliczenia można zastosować na przykład w sytuacji, gdy ścieżki są niezależne, a prawdopodobieństwo wystąpienia określonych wyników jest znane. Taka ocena ilościowa jest potrzebna, aby zapewnić skuteczność kontroli.
Źródło:
Nafta-Gaz; 2023, 79, 8; 557-561
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydroponics agriculture as a modern agriculture technique
Autorzy:
Monisha, K.
Kalai Selvi, H.
Sivanandhini, P.
Sona Nachammai, A.
Anuradha, C. T.
Rama Devi, S.
Kavitha Sri, A.
Neya, N. R.
Vaitheeswari, M.
Hikku, G. S.
Powiązania:
https://bibliotekanauki.pl/articles/24200644.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
hydroponics
agriculture
hoagland solution
macronutrients
micronutrients
types of hydroponic system
hydroponika
rolnictwo
makroskładniki
mikroskładniki
Opis:
Purpose Hydroponics, also known as controlled environment agriculture, is a method of cultivating plants and herbs without soil using mineral-supplemented solutions. Agriculture biotechnology enhances its wings on developing genetically modified plants for expanding crop yield and introducing characteristic features such as growing seasonal crops throughout the year, weather-resistant, and pest resistance. Compared to traditional agriculture, hydroponic cultivation yields high-quality crops with 90% more efficient use of water. Therefore, hydroponic cultivation could be considered a succeeding future of agriculture. In this context, understanding agriculture through the hydroponic route is vital for the efficient cultivation of crops. This review elaborates on the different classes of hydroponic systems and the factors that enable the systematic elements of the frame-up. Design/methodology/approach The significant intent of this review is to provide information on distinct hydroponic systems. Findings The present review reports a comprehensive discussion about the significance of the hydroponics system, its mechanism, nutrient solution preparation, types of hydroponic setup, and the challenges faced and would light up the knowledge in the same. Originality/value This review focus on the current feasible hydroponic method of crop cultivation.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2023, 116, 1; 25--35
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of process parameters in removing wastewater impurities via progressive freeze crystallization
Autorzy:
Mazzam, A.A.
Hamizlan, H.A.
Jamal Ikhsan, I.Z.A.I.
Bakar, M.N.F.
Ab Hamid, F.H.
Powiązania:
https://bibliotekanauki.pl/articles/24200623.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
environmental management
crystallization
wastewater treatment
tricholorophenol
zarządzanie środowiskiem
krystalizacja
oczyszczanie ścieków
tricholorofenol
Opis:
Purpose: The research aims to investigate the effect of the process parameter of progressive freeze concentration to eliminate tricholorophenol in wastewater. Design/methodology/approach: A stainless steel crystallizer was used throughout the experiment. Simulated wastewater containing trichlorophenol (TCP) was used as a sample solution, and ethylene glycol was utilized as a coolant to induce the heat transfer at a very low temperature. Progressive freeze crystallization (PFC) is an approach to purify water by implementing the fundamental concept of difference freezing point. In short, the PFC system produces ice-crystal layer by layer on a cooled surface until it forms a large and single-crystal block, leaving the impurities in the mother liquor. Findings: It is established that operating time and initial concentration influence the PFC performance. The findings show that the intermediate operating time gave the highest removal of TCP in wastewater. Meanwhile, for the effect of initial concentration, it was discovered that the lowest initial concentration resulted in the best TCP reduction with high purity of the water was obtained. Research limitations/implications: The results can be complemented by studies of the effect of coolant temperature and solution movement. These two parameters are believed to potentially improve the PFC performance. Practical implications: The findings can be implemented to select the optimal operating condition to treat the wastewater, especially in the industrial area with hazardous TCP. Originality/value: The obtained results testify to the predominant influence of operating time and initial concentration on the PFC performance in eliminating TCP in wastewater.
Źródło:
Archives of Materials Science and Engineering; 2023, 119, 2; 56--61
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigate Bending Effect of Wearable GPS Patch Antenna with Denim and Polyester Fabric Substrate
Autorzy:
Radhakrishna, Kavinesh S.
Shakhirul, M. S.
Lee, Y. S.
Khairina, K. N.
Syafiqah, A. R. A.
Powiązania:
https://bibliotekanauki.pl/articles/27311855.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
denim and polyester fabric substrates
textile antenna
global positioning system (GPS)
Opis:
In high technologies today, wearable devices have become popular. Wearable technology is a body sensing system that supports application of health observance and tracking through a wearable Global Positioning System (GPS). The design of the patch antennas is highly significant for the brilliance of the wearable patch antennas. This paper focuses on analyzing the bending effect on return loss and frequency between three types of GPS patch antenna. Types of GPS patch antennas that have been designed in this project are with different substrates and different designs. The wearable patch antenna has been designed and analyse using CST software. As a result, able to analysis the reflection coefficient (S11), radiation patterns, and analytical approach for patch antenna bending effect were obtained.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 2; 225--231
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on surface roughness and kerf analysis in abrasive water jet machining of silicon carbide
Autorzy:
Hynes, N.R.J.
Asirvatham, A.D.
Sankaranarayanan, R.
Raja, S.
Benita, B.
Atchaya, J.
Powiązania:
https://bibliotekanauki.pl/articles/24200627.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
ceramic
cutting
abrasive water jet machining
ceramika
cięcie
cięcie strumieniem wodno-ściernym
Opis:
Purpose: Machining silicon carbide (SiC) is challenging due to its brittle and maximum tensile nature. Lapping or laser beam are done with a high cost of manufacturing and low material removal rates. Water abrasive jet cutting is a promising candidate since the machining temperatures and processing force of ceramics are extremely low. Investigation into the abrasive water jet machining of silicon carbide is carried out in the present work. Design/methodology/approach: The variations in traverse speed while abrasive water jet cutting of silicon carbide and its effect on the surface roughness and kerf characteristics are studied. Silicon Carbide abrasive material is used as garnet consisting of 80 mesh. The surface roughness was calculated along with the depth of the cut made during the processing. Findings: The outcomes demonstrated that the traverse speed is more effective upon the surface roughness and is an important factor that damages the top kerf width and the kerf taper angle. Research limitations/implications: Based on the hardness and thickness of the SiC plate, the taper angle is high, and for a feed rate of 10 mm/min, the surface roughness is low. Less thickness of the SiC plate could have a lower taper angle than with high thickness. The erosive force is provided by abrasive material along with the jet stream. Practical implications: Water abrasive fine jet could effectively machinate silicon carbide ceramic material with a better surface finish accurately. Suitable surface roughness with higher productivity can be attained with medium traverse speed. Originality/value: The effect of process parameters on kerf taper angle and top kerf width in the abrasive water jet machining of silicon carbide is explored, considering surface roughness as an important output parameter.
Źródło:
Archives of Materials Science and Engineering; 2023, 120, 1; 30--35
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetics models of hydrogen sulphide adsorption from hydrogel biochar derived from empty fruit bunch (EFB)
Autorzy:
Alias, A.B.
Ariffin, A.Y.
Norain, N.M.R.
Rashid, Z.A.
Powiązania:
https://bibliotekanauki.pl/articles/24200629.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
hydrogen sulphide
adsorption
kinetics models
empty fruit bunch
hydrogel
siarkowodór
adsorpcja
modele kinetyki
pusta kiść owoców
hydrożel
Opis:
Purpose: This research aims to investigate the detailed state of adsorption kinetics modelling and research on the application of hydrogen sulfide adsorption by hydrogel derived from empty fruit bunch (EFB), the determination of the kinetics parameters, and the comparison between models in a selection of the best-fit model. Design/methodology/approach: The kinetics modelling used are pseudo-first-order and pseudo-second-order models. The correlation coefficient was used to evaluate the suitability of the equation R2. After obtaining the results, the comparison was made by comparing the R2 of each model. The pseudo-second-order model has a higher value of correlation coefficient, R2, making it the most suitable kinetics model for adsorption systems. Findings: The R2 for pseudo-first-order on the effect of dry bed height was 0.8814, whereas its effect on powder bed height was 0.9537, and that of the wet bed height was 0.9607. Meanwhile, the R2 for pseudo-second-order on the effect of dry bed height was 0.89, on the effect of the powder bed height was 0.99, and on the effect of the bed height of wet was 0.99, the highest among kinetic models. Based on the results, the pseudo-second-order model best describes the adsorption of hydrogen sulfide (H2S) by hydrogel biochar. Research limitations/implications: The kinetics modelling used are pseudo-first-order, and pseudo-second-order models for hydrogen sulfide adsorption by hydrogel originating from empty fruit bunches (EFB). Practical implications: Based on the results, the pseudo-second-order model best describes the adsorption of hydrogen sulfide (H2S) by hydrogel biochar. Kinetic studies are important in understanding the reactions and design of the process. Originality/value: The authenticity results of this article were found to be 17% similar. The novelty of this paper is the kinetics study of the new adsorbent developed based on EFB to adsorb H2S.
Źródło:
Archives of Materials Science and Engineering; 2023, 120, 1; 15--21
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 2470

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