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Wyświetlanie 1-15 z 1166
Tytuł:
Expression of vascular endothelial growth factor and microvessel density in oral squamous cell carcinoma and its correlation with various clinico-pathological parameters
Autorzy:
Panigrahi, Ranjita
Jha, Narendra Kumar
Hota, Subhransu Kumar
Powiązania:
https://bibliotekanauki.pl/articles/38695726.pdf
Data publikacji:
2024-03-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
microvessel density
oral squamous cell carcinoma
vascular endothelial growth factor
Opis:
Introduction and aim. Angiogenesis, which is accomplished by capillary sprouting, is the process by which new vessels are created from pre-existing ones. In tumor, once their initial blood supply is depleted, a tumour is unable to grow without additional blood flow. Additionally, a tumor’s microvasculature, or microvessel density (MVD), increases along with its capacity to produce angiogenesis. We aimed to observe the relationship between the expression of vascular endothelial growth factor (VEGF) and MVD (using CD34) in oral squamous cell carcinoma (OSCC). Material and methods. The expression of VEGF and CD34 antibodies was analysed using immunohistochemistry method on 50 cases of histopathologically proved OSCC. The expression was correlated with clinicopathological parameters. Results. A significant correlation was observed between VEGF expression and gender, LVSI. No correlation between any other factors and the difference in VEGF expression was statistically significant. Similarly, the MVD expression was not found to be statistically significant in any of the pathological parameters. Conclusion. VEGF positivity as well as MVD were found to be independent of the tumor pathology. Tumor MVD was found to be independent of the expression of VEGF. Further studies in a larger study group may establish a significant association so that antiangiogenic targeted therapy may be initiated.
Źródło:
European Journal of Clinical and Experimental Medicine; 2024, 22, 1; 82-87
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intraocular metastasis of small cell lung cancer: a case report
Autorzy:
Pażyra, Aldona
Kusak, Natalia
Żak, Natalia
Jaworska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/44424309.pdf
Data publikacji:
2024-01-09
Wydawca:
Medical Education
Tematy:
intraocular metastasis
SCLC
small cell lung cancer
Opis:
We report a rare case of intraocular metastasis of small cell lung cancer with disease progression.
Źródło:
OncoReview; 2023, 13, 4; 99-102
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metabolomic analysis of biological material using LC-MS in the quest for urinary system cancer biomarkers - review
Autorzy:
Szuberla, Wiktoria
Wrona, Maria
Powiązania:
https://bibliotekanauki.pl/articles/31342652.pdf
Data publikacji:
2024
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
mass spectrometry
metabolomics
LC-MS
kidney cancer
renal cell carcinoma
bladder cancer
spektrometria mas
metabolomika
rak nerki
rak nerkowokomórkowy
rak pęcherza moczowego
Opis:
Renal cell carcinoma (RCC) and bladder cancer (BC) are among the most frequently diagnosed urinary system cancers worldwide. They are characterized by high mortality and recurrence rates. In response to the rising incidence and mortality rates, scientists are exploring innovative diagnostic and therapeutic methods. Metabolomics, which analyzes metabolite levels, may enable early diagnosis and monitoring of therapy progress. Compared to other omics technologies, it focuses on the outcomes of metabolite activity, providing a unique perspective on processes occurring in cancer cells. Metabolomic analyses utilize techniques such as mass spectrometry. These methods allow the identification of biomarkers and precise determination of the chemical composition of biological samples. However, the most commonly used method is liquid chromatography-mass spectrometry (LC-MS), which enables the most comprehensive screening of cancer metabolomes. Recent studies show significant progress in recognizing characteristic metabolites associated with urological cancers, although this area remains partially unexplored. Research on circulating metabolites, especially those present in easily accessible samples like blood or urine, demonstrates promising potential in clinical practice. Study results reveal differences in metabolic profiles between various stages of cancer development, which may have clinical significance. The future of this field involves an increasing number of clinical cohorts, standardization of sample preparation, and further improvements in instrument sensitivity and speed. LC-MS-based metabolomics has the potential to contribute to the improvement of diagnostics, therapy, and the quality of life of patients with some urological cancers. However, challenges, such as the lack of uniform methodologies and understanding of metabolite determinants, require further research and innovation.
Źródło:
Chemical Technology & Biotechnology; 2024, 4; 70-75
2720-6793
Pojawia się w:
Chemical Technology & Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przegląd ekologicznych militarnych i cywilnych systemów zasilania
The overview of ecologic military and civilian power systems
Autorzy:
Michalak, Sławomir
Kowalczyk, Henryk
Gębura, Andrzej
Tokarski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/38914031.pdf
Data publikacji:
2024
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ogniwo wodorowe
ogniwo paliwowe
PEM
ogniwo metanolowe
DMFC
panel fotowoltaiczny
PV
elastyczny panel fotowoltaiczny
EPF
system naziemny
system lotniczy
system zasilania elektrycznego
statek powietrzny
system łączności
hydrogen cell
fuel cell
methanol cell
photovoltaic panel
elastic photovoltaic panel
on-board system
aircraft system
electric power system
aircraft
communication system
Opis:
Pozyskiwanie energii elektrycznej jest istotnym wyzwaniem XXI wieku. Na świecie w elektroenergetycznych projektach cywilnych coraz silniej dominują tendencje proekologiczne: energia wiatru, promieniowania słonecznego i energia elektryczna z tzw. baterii wodorowych i ich mutacji. W zastosowaniach wojskowych wykorzystanie tego typu źródeł również jest korzystne, gdyż znacznie poprawia możliwości maskowania, m.in. umożliwia zmniejszenie poświaty termicznej i natężenia hałasu. Autorzy artykułu opracowali przegląd ekologicznych systemów zasilania oraz przedstawili aktualny stan wdrożeń.
Obtaining electrical energy is a substantial challenge for the 21st century. The world is increasingly dominated by pro-ecological tendencies: wind energy, solar radiation and electric energy from the so-called hydrogen batteries and their mutations. In military applications, using these source types is also beneficial since it substantially improves camouflage possibilities, e.g., it enables the reduction of the thermal afterglow and noise intensity. The manuscript’s authors developed the overview of pro-ecological power systems and presented the current state of implementations.
Źródło:
Journal of KONBiN; 2024, 54, 1; 33-46
1895-8281
2083-4608
Pojawia się w:
Journal of KONBiN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small Cell Lung Cancer (SCLC) and Squamous Cell Carcinoma (SCC) of the External Auditory Canal as an Example of Synchronous Cancers – Case Report
Rak drobnokomórkowy płuca (SCLC) i rak kolczystokomórkowy (SCC) przewodu słuchowego zewnętrznego jako przykład nowotworów synchronicznych – opis przypadku
Autorzy:
Żeleźnicka, Monika
Filipow, Joanna
Grydź, Filip
Sarosiek, Tomasz
Sprawka, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/34656180.pdf
Data publikacji:
2024
Wydawca:
Uczelnia Łazarskiego. Oficyna Wydawnicza
Tematy:
small cell lung cancer
synchronous cancers
multiple primary cancers
squamous cell carcinoma
rak drobnokomórkowy
rak kolczystokomórkowy
nowotwory synchroniczne
nowotwory mnogie
Opis:
In recent years, the incidence of malignant tumors, including multiple tumors, has increased. The diagnosis of primary multiple tumors affects between 0.73% and 11.7% of oncology patients. Some patients are diagnosed with synchronous tumors, meaning independent tumor foci are identified within an interval of less than six months. The diagnosis requires histopathological confirmation of the different tumor morphologies and the exclusion of the lesions as metastatic foci. The most frequently diagnosed multiple cancers originate in the head and neck. The diagnosis of a second independent tumor in a patient significantly shortens the five-year survival rate and increases the risk of disease recurrence or the detection of additional primary tumors. A 66-year-old (now 74-year-old) patient with hearing loss was diagnosed with cancer of the external auditory canal. In oncological diagnostics, it was decided to perform, among other tests, a PET-CT examination to exclude metastatic foci. A metabolically active lesion was visible in the hilum of the left lung and the right adrenal gland. Further diagnostics identified the lesion as an independent tumor in the lung, with the morphology of small cell carcinoma in stage IV, with metastases to the right adrenal gland. In the patient interview, nicotine addiction and chronic obstructive pulmonary disease requiring home oxygen therapy were noted. The patient was treated in accordance with the then NCCN, ESMO, and PTOK guidelines. The lesion in the external auditory canal was resected with an R1 margin. Due to the diagnosis of small cell carcinoma, the patient underwent six cycles of EP chemotherapy (etoposide, cisplatin). The treatment was supplemented with radiotherapy of the lesion in the left lung and planned radiotherapy of the central nervous system (PCI – prophylactic cranial irradiation). The aim of this study is to emphasize the importance of accurate diagnostics at the initial diagnosis of cancer and to consider the possibility of diagnosing metastatic lesions as second (and subsequent) primary lesions. This is crucial when assessing overall survival (OS) and relapse-free survival (RFS). It is also important to note the difficulties in planning the treatment of two independent cancer sites, which most often requires different therapeutic approaches. A complete response to treatment was achieved on the RECIST scale.
W ostatnich latach odnotowano wzrost zachorowalności na nowotwory złośliwe, w tym nowotwory mnogie. Rozpoznanie pierwotnych nowotworów mnogich dotyczy od 0.73% aż do 11.7% pacjentów onkologicznych. U części chorych zostały zdiagnozowane jako nowotwory synchroniczne, co oznacza rozpoznanie niezależnych ognisk nowotworowych w odstępie mniejszym niż 6 miesięcy. Do rozpoznania jest wymagane potwierdzenie histopatologiczne odmiennej morfologii nowotworu oraz wykluczenie powiązania zmian jako ognisk przerzutowych. Najczęściej rozpoznawane nowotwory mnogie mają jedno źródło w obrębie głowy i szyi. Rozpoznanie drugiego niezależnego ogniska nowotworu u pacjenta znacznie skraca pięcioletnie przeżycie i powoduje wzrost ryzyka nawrotu choroby lub wykrycia kolejnych ognisk pierwotnych. U 66-letniej (obecnie 74-letniej) pacjentki diagnozowanej z powodu pogorszenia słuchu rozpoznano nowotwór przewodu słuchowego zewnętrznego. W trakcie diagnostyki onkologicznej zdecydowano o wykonaniu m.in. badania PET-CT celem wykluczenia ognisk przerzutowych. Uwidoczniono aktywną metabolicznie zmianę we wnęce płuca lewego oraz nadnerczu prawym. W trakcie dalszej diagnostyki rozpoznano zmianę jako niezależne ognisko nowotworowe pierwotnie zlokalizowane w płucu o morfologii raka drobnokomórkowego w stadium IV z przerzutem do nadnercza prawego. W wywiadzie pacjentki warto zwrócić uwagę na nikotynizm oraz przewlekłą obturacyjną chorobę płuc wymagającą leczenia tlenoterapią w warunkach domowych. Pacjentka była leczona zgodnie z ówczesnymi wytycznymi NCCN, ESMO, PTOK. Zmianę w przewodzie słuchowym zewnętrznych poddano resekcji z marginesem R1. Ze względu na rozpoznanie nowotworu drobnokomórkowego płuca lewego, pacjentka została poddana chemioterapii w schemacie EP (etopozyd, cisplatyna) w sześciu cyklach. Leczenie uzupełniono radioterapią zmiany w płucu lewym oraz elektywną radioterapią ośrodkowego układu nerwowego (PCI – ang. profilactic cranial irradiation). Uzyskano całkowitą odpowiedź na leczenie w skali RECIST. Praca ma na celu podkreślenie istotności dokładnej diagnostyki pacjentów przy rozpoznaniu pierwszorazowym nowotworu oraz uwzględnieniu możliwości rozpoznania ognisk przerzutowych jako drugiego (i kolejnego) ogniska pierwotnego. Jest to bardzo ważne przy ocenie przeżycia całkowitego (OS – ang. overall survival) oraz przeżycia bez nawrotu nowotworu (RFS – ang. relapse-free survival). Warto zwrócić uwagę na trudności w planowaniu leczenia dwóch niezależnych ognisk nowotworowych, co najczęściej wymaga planowania odmiennych procesów terapeutycznych.
Źródło:
Review of Medical Practice; 2024, XXX, 1; 74-81
2956-4441
2956-445X
Pojawia się w:
Review of Medical Practice
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A review of technologies in the area of production, storage and use of hydrogen in the automotive industry
Autorzy:
Małek, Arkadiusz
Karowiec, Marek
Jóźwik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/24200878.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
hydrogen
electrolyzer
green hydrogen
hydrogen storage
hydrogen fuel cell
fuel
cell
vehicle
Opis:
Presently, we can learn and read more and more about hydrogen in both traditional and social media. The article answers why there is so much interest in hydrogen recently. It has been recognized by European and global decision-makers as a very promising medium necessary to carry out the climate and energy transformation. The advantages of hydrogen as a fuel and as a medium for storing large amounts of energy over a longer period of time is also presented. In addition, an overview of hydrogen technologies presented at the Hydrogen Technology Expo in Bremen in September 2023 is provided. The state of hydrogen technologies currently available on the market is compared to the latest achievements of scientists described in scientific articles. The aim of the article is to review the technologies available on the market for the production, storage and use of hydrogen as a vehicle fuel. Hydrogen technologies presented at the Hydrogen Expo in Bremen were confronted with the latest scientific achievements described in the latest scientific articles. Thanks to such a confrontation, it is possible to make a rational purchasing decision in the area of selected hydrogen technologies.
Źródło:
Archiwum Motoryzacji; 2023, 102, 4; 41--67
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced cascaded scheduling for highly autonomous production cells with material flow and tool lifetime consideration using AGVs
Autorzy:
Miller, Eddi
Engelmann, Bastian
Kaupp, Tobias
Schmitt, Jan
Powiązania:
https://bibliotekanauki.pl/articles/24084716.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
scheduling
robotic cell
algorithm
makespan optimization
Opis:
In today’s manufacturing systems, especially in Industry 4.0, highly autonomous production cells play an important role. To reach this goal of autonomy, different technologies like industrial robots, machine tools, and automated guided vehicles (AGV) are deployed simultaneously which creates numerous challenges on various automation levels. One of those challenges regards the scheduling of all applied resources and their corresponding tasks. Combining data from a real production environment and Constraint Programming (CP-SAT), we provide a cascaded scheduling approach that plans production orders for machine tools to minimize makespan and tool changeover time while enabling the corresponding robot for robot-collaborated processes. Simultaneously, AGVs provide all production cells with the necessary material and tools. Hereby, magazine capacity for raw material as well as finished parts and tool service life are taken into account.
Źródło:
Journal of Machine Engineering; 2023, 23, 3; 69--85
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alunogen from the sulfate efflorescence of the Stone Town Nature Reserve in Ciężkowice (the Outer Carpathian Mountains, Poland)
Autorzy:
Marszałek, Mariola
Gaweł, Adam
Powiązania:
https://bibliotekanauki.pl/articles/27310118.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sulfate efflorescence
alunogen
thermal analysis
Raman spectroscopy
unit-cell parameters
the Carpathian Mountains
Polska
Opis:
Alunogen (Al2(SO4)3∙17H2O), a rare secondary mineral, has been found in the efflorescence on sandstones from the Stone Town Nature Reserve in Ciężkowice, southeastern Poland. This is probably the first find of this salt on such rocks in Poland. Alunogen forms in various geological environments, but mainly from the oxidation of pyrite and other metal sulfides in ore deposits and Al-rich Earth materials under low-pH conditions. Its crystallization at this particular site depends on a set of necessary physicochemical (pH, concentration), climatic (season, temperature, humidity), site-related (location and protection of efflorescence), and mineralogical (the presence of pyrite) conditions. This paper presents the mineralogical and geochemical characteristics of the alunogen from the Stone Town Nature Reserve (based on SEM-EDS, XRPD, EPMA and Raman spectroscopy methods) as well as of the efflorescence itself (based on XRPD and STA coupled with QMS and FTIR for the analysis of gas products). Crystals of alunogen take the shape of flakes, often with a hexagonal outline, clustered in aggregates forming a cellular network. Its calculated formula is (Al1.96Fe3+ 0.01)∑1.97(SO4)3∙17H2O (based on 12 O and 17 H2O). The unit-cell parameters refined for the triclinic space group P1 are: a = 7.423 (1) Å, b = 26.913 (5) Å, c = 6.056 (1) Å, α = 89.974 (23)°, β = 97.560 (25)°, γ = 91.910 (22)°. The Raman spectra (SO4) bands are: intensive 995 cm−1 (ν1); low-intensive 1069, 1093 and 1127 cm−1 (ν3); low-intensive 419 and 443; medium-intensive 470 cm−1 (ν2); and medium-intensive 616 cm−1 (ν4). Those at 530, 312 and at 338 cm−1 are assigned to water vibrations and those at 135, 156, 180 cm−1 to the lattice modes. Although the efflorescence contained an admixture of other minerals (pickeringite, gypsum and quartz), the predominant alunogen is almost chemically pure and the above parameters are consistent with the values reported in the literature for alunogen from different locations and of various origins.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 2; 139--156
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contaminants Removal from Real Refinery Wastewater Associated with Energy Generation in Microbial Fuel Cell
Autorzy:
Jabbar, Noor Mohsen
Alardhi, Saja Mohsen
Al-Jadir, Thaer
Dhahad, Hayder Abed
Powiązania:
https://bibliotekanauki.pl/articles/2202351.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
microbial fuel cell
phenol
furfural
power generation
COD
chemical oxygen demand
petroleum refinery wastewater
Opis:
Microbial fuel cells (MFCs) pertain to a kind of modern technology for the direct conversion of chemical energy in organic matter from wastewaters into electricity during the oxidation of organic substrates. A system of continuous MFC was constructed for the treatment of real petroleum refinery wastewater (PRW). The treatment of real PRW, operational performance of the MFC system, biodegradation of furfural, and energy output were investigated in this study. The MFC was inoculated by mixed anaerobic bacteria, with Bacillus sp. as the dominant type, and continuously operated for 30 days. The biodegradation of furfural and phenol, which are the most prevalent toxicants in refinery wastewater, was investigated. The MFC system reached maximum energy outputs of 552.25 mW/m3 and 235 mV. In the anodic chamber, the maximum removal of furfural and phenol was higher than 99%, with biodegradation of organic content reaching up to 95%. This study demonstrated the viability of a continuous-flow MFC system as a green technology for the treatment of furfural-rich real refinery effluents while generating electricity.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 107--114
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Using Various Cathode Materials (Carbon Felt, Ni-Co, Cu-B, and Cu-Ag) on the Operation of Microbial Fuel Cell
Autorzy:
Włodarczyk, Paweł P.
Włodarczyk, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/27314860.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
bioelectricity
microbial fuel cell
MFC
cathode materials
bioelectrochemical system
COD reduction
renewable energy sources
bioelektryczność
mikrobiologiczne ogniwo paliwowe
materiały katodowe
system bio-elektrochemiczny
redukcja ChZT
odnawialne źródła energii
Opis:
Wastewater has high potential as an energy source. Therefore, it is important to recover even the smallest part of this energy, e.g., in microbial fuel cells (MFCs). The obtained electricity production depends on the process rate of the electrodes. In MFC, the microorganisms are the catalyst of anode, and the cathode is usually made of carbon material. To increase the MFC efficiency it is necessary to search the new cathode materials. In this work, the electricity production from yeast wastewater in membrane-less microbial fuel cells with a carbon felt, Ni-Co, Cu-B, and Cu-Ag cathodes has been analyzed. In the first place, the measurements of the stationary potential of the electrodes (with Cu-Ag catalyst obtained by the electrochemical deposition technique) were performed. Next, the analysis of the electric energy production during the operation of the membrane-less microbial fuel cell (ML-MFC). The highest parameters were obtained for the Ni-Co and Cu-Ag catalysts. The cell voltage of 607 mV for Ni-Co and 605 mV for Cu-Ag was obtained. Additionally, the power of 4.29 mW for both cathodes - Ni-Co and Cu-Ag was obtained. Moreover, Ni-Co and Cu-Ag allow the shortest time of COD reduction. Based on the test results (with selected MFC design, wastewater, temperature, etc.), it can be concluded that of all the analyzed electrodes, Cu-Ag and Ni-Co electrodes have the best parameters for use as cathodes in ML-MFC. However, based on the results of this study, it can be concluded that all the tested electrodes can be used as cathode material in MFC.
Źródło:
Civil and Environmental Engineering Reports; 2023, 33, 4; 95--105
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effectiveness of current technology in GHG reduction – A literature survey
Autorzy:
Klakeel, T.
Anantharaman, M.
Islam, R.
Garaniya, V.
Powiązania:
https://bibliotekanauki.pl/articles/24201381.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
effectiveness evaluation
greenhouse gas
literature review
marine environment
IMO guidelines
hydrogen fuel cell
heavy fuel oil
energy efficiency design index
Opis:
In 2018 during the 72nd session of the Maritime Environmental Protection Committee (MEPC) IMO adopted its initial strategy for the reduction of greenhouse gas emissions (GHG) from the ships to meet the Paris Agreement Goals, 2015. This is considered as a major milestone in formulizing a clear strategy by IMO towards its objective of reducing the global GHG emissions from the ships. The strategy had two primary objectives: the first was to decrease total annual GHG emissions by at least 50% by 2050 compared to 2008 levels. The second objective was to promote the phasing out of GHG emissions entirely. In 2020, the International Maritime Organization (IMO) conducted a study which revealed that greenhouse gas (GHG) emissions from shipping had increased by 9.6%. The rise in global maritime trade was identified as the main factor behind this increase. IMO's 2020 study also concluded that reducing GHG emissions by focusing only on energy-saving technologies and ship speed reduction would not be enough to meet the IMO's 2050 GHG reduction target. Therefore, greater attention needs to be given to the use of low-carbon alternative fuels. To understand the effectiveness of currently available technologies in reducing GHG emissions from ships, a literature survey was conducted in this study. The survey examined a range of related articles published between 2018 and 2022. This study aimed to identify the current stage and the quantity of literature available on various technologies and, more importantly, serve as a decision-making support tool for selecting a technology under specific circumstances in a quantitative manner. The technologies were divided into four groups: those that utilize fossil fuels, those that use renewable energy, those that use fuel cells, and those that use low-carbon or alternative fuels. The literature survey was conducted using Web of Science (WoS) and Google Scholar. The results of this study will also help to identify clear research gaps in comparing the effectiveness of various available technologies to reduce GHG emissions. Ultimately, the aim is to develop a comprehensive strategy that can be used to reduce GHG emissions from shipping and contribute to the global fight against climate change.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 171--176
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical performance analysis and optimization of monofacial and bifacial crystalline silicon solar cells
Autorzy:
Manikandan, A. V. M.
Prince, Shanthi
Powiązania:
https://bibliotekanauki.pl/articles/27310104.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
silicon
monofacial solar cell
bifacial solar cell
PC1D
quantum efficiency
conversion efficiency
albedo
bifaciality factor
PERT
Opis:
This paper presents the investigations and performance analysis of monofacial and bifacial crystalline silicon solar cells with PC1D simulation software. The fundamental limitation in the monofacial solar cell’s performance is its inability to absorb all the incoming solar radiation since the albedo effect (ground-reflected light that can be captured by the rear of the solar cell) is often neglected. So, the efficiency of the monofacial cell will be lower due to poor and incomplete optical absorption. Bifaciality helps to enhance the capturing of light in the solar cell, which means that the rear of the cell is exposed to solar radiation to produce electrical power. The primary focus of our work is to determine which solar cell offers better device performance and conversion efficiency by analyzing various parameters of the solar cell like surface texturing, emitter doping, bulk doping, minority carrier lifetime, bulk and surface recombination rates, front and rear reflectance, among other parameters. The other parameters are maintained at an optimal range to achieve the highest conversion efficiency. Our work has shown that the bifacial solar cell can be as efficient as 28.15%, which is much better than the 22.65% efficiency of the monofacial solar cell.
Źródło:
Optica Applicata; 2023, 53, 3; 327--351
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy management strategy considering energy storage system degradation for hydrogen fuel cell ship
Autorzy:
Cao, Wei
Geng, Pan
Xu, Xiaoyan
Tarasiuk, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/32921248.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrogen fuel cell ship
energy management
fuzzy PID
equivalent energy consumption minimum
energy storage system degradation
Opis:
A hybrid energy system (HES) including hydrogen fuel cell systems (FCS) and a lithium-ion (Li-ion) battery energy storage system (ESS) is established for hydrogen fuel cell ships to follow fast load transients. An energy management strategy (EMS) with hierarchical control is presented to achieve proper distribution of load power and enhance system stability. In the high-control loop, a power distribution mechanism based on a particle swarm optimization algorithm (PSO) with an equivalent consumption minimization strategy (ECMS) is proposed. In the low-level control loop, an adaptive fuzzy PID controller is developed, which can quickly restore the system to a stable state by adjusting the PID parameters in real time. Compared with the rule-based EMS, hydrogen consumption is reduced by 5.319%, and the stability of the power system is significantly improved. In addition, the ESS degradation model is developed to assess its state of health (SOH). The ESS capacity loss is reduced by 2% and the daily operating cost of the ship is reduced by 1.7% compared with the PSO-ECMS without considering the ESS degradation.
Źródło:
Polish Maritime Research; 2023, 2; 95-104
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feeding a Membrane-less Microbial Fuel Cell by Mixed Municipal and Industrial Wastewater
Autorzy:
Włodarczyk, Barbara
Włodarczyk, Paweł P.
Powiązania:
https://bibliotekanauki.pl/articles/27314862.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
bioelectricity
bioenergy
microbial fuel cell
MFC
municipal wastewater
industrial wastewater
renewable energy sources
COD reduction
environmental protection
bioelektryczność
bioenergia
mikrobiologiczne ogniwo paliwowe
ścieki komunalne
ścieki przemysłowe
odnawialne źródła energii
Redukcja ChZT
ochrona środowiska
Opis:
Due to the constant growth of the world's population, the amount of generated wastewater is also constantly increasing. One of the devices that can use wastewater as a raw material for energy production is a microbial fuel cell (MFC). MFCs technology is constantly evolving. However, to increase its use, it is necessary to improve its efficiency. There are various possibilities to ensure this, such as the use of new electrode materials, new cell designs, or the use of wastewaters from different sources. In this paper the analysis of MFC operation (cell voltage, power, and current density) fed by mixed municipal and industrial wastewaters was shown. Moreover, the change in time of COD was analyzed. Due to cost reduction the membrane-less microbial fuel cell (ML-MFC) was chosen. It was noted that the addition of concentrated process wastewater increases the COD reduction time in the ML MFC. An increase of generated bioelectricity during fed ML-MFC by mixed municipal and industrial (process wastewater from yeast production) wastewater was demonstrated. The highest values of average cell voltage (598 mV), maximum power (4.47 mW) and maximum current density (0.26 mA•cm-2) were obtained for a 10% share of yeast process wastewater in the mixed wastewater, which fed the ML-MFC.
Źródło:
Civil and Environmental Engineering Reports; 2023, 33, 4; 50--62
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formalization of the non-linear programming for the configuration of the heat exchange system in column apparatuses of the petrochemical industry with minimum costs
Zastosowanie programowania nieliniowego dla konfiguracji systemu wymiany ciepła w aparatach kolumnowych przemysłu petrochemicznego przy minimalnych kosztach
Autorzy:
Malikov, Rauf Kh.
Abbasov, Natiq M.
Rahimova, Mahluqa S.
Ahmadov, Alihikmat A.
Powiązania:
https://bibliotekanauki.pl/articles/31348281.pdf
Data publikacji:
2023
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
cell packing
mesh packing
column apparatus
non-linear programming
heat transfer
upakowanie komórkowe
upakowanie sieciowe
aparat kolumnowy
programowanie nieliniowe
przekazywanie ciepła
Opis:
For increasing the efficiency of heat transfer processes, the layer-by-layer concept of arrangement of various types of packings in column apparatuses is considered. The results of hydraulic tests of a dry and irrigated cell packing, as well as individual hydraulic tests of a mesh packing, are presented. Methods and algorithms for solving linear programming problems under “uncertainty” conditions were considered. However, in some areas of science it is often difficult or impossible to formalize the problem in an appropriate way and reduce it to a linear programming problem. In this paper, methods for solving non-linear programming problems with a vector objective function are considered. At present, the use of non-linear programming in the vast majority of real situations is reduced to linear approximation models. Along with this, at a significant non-linearity, due to its specificity or influence on the nature of the model, it is necessary to apply optimization methods that are much more complex than, for example, the simplex method. However, the importance of non-linear programming is constantly increasing. This is due to the rapidly growing knowledge of managers and specialists in the use of mathematical models designed to prepare solutions, as well as the increasing availability of computer programs for solving large-scale nonlinear problems. The analysis and studies of the hydrodynamics of a number of regular packings have shown that cell and mesh packings are promising for the implementation of the phase inversion mode. The proposed concept of intensifying heat transfer processes in column apparatuses is based on the use of layers of various packings arranged in the following order in the apparatus, type 1 – cell, type 2 – mesh. At the same time, their main geometric characteristics differ significantly from each other. However, the structure of the bulk packing is inhomogeneous, which makes it difficult to implement a stable mode of local phase inversion under these conditions. This is due to the structure of column apparatuses with bulk packing, in which there is an increased proportion of pores (porosity) near the walls of the apparatus. Porosity is very significant; it can reach up to 40%, and as a result, the local velocity near the walls exceeds the velocity in the centre of the apparatus by up to 70%. By contrast, the use of regular packing structures makes this potentially highly efficient mode technically possible.
W celu zwiększenia efektywności procesów wymiany ciepła rozważa się koncepcję warstwowego rozmieszczenia różnego rodzaju pakietów w aparatach kolumnowych, warstwa po warstwie. Przedstawiono wyniki badań hydraulicznych suchego i nawodnionego upakowania komórkowego oraz indywidualne badania hydrauliczne upakowania sieciowego. Uwzględniono metody i algorytmy dla rozwiązywania problemów programowania liniowego w warunkach „niepewności”. Jednakże, w niektórych dziedzinach nauki często trudne lub niemożliwe jest sformalizowanie problemu w odpowiedni sposób i zredukowanie go do problemu programowania liniowego. W niniejszym artykule uwzględniono metody rozwiązywania problemów programowania nieliniowego z wektorową funkcją celu. Zastosowanie programowania nieliniowego w znacznej większości rzeczywistych sytuacji jest obecnie zredukowane do modeli aproksymacji liniowej. Wraz z tym, przy znaczącej nieliniowości, ze względu na jej specyfikę lub wpływ na charakter modelu, konieczne jest zastosowanie metod optymizacji, które są o wiele bardziej złożone niż na przykład metoda sympleksów. Jednakże, znaczenie programowania nieliniowego stale rośnie. Wynika to z szybko rosnącej wiedzy kadry zarządzającej i specjalistów od stosowania modeli matematycznych zaprojektowanych do przygotowywania rozwiązań, jak również zwiększającą się dostępnością programów komputerowych do rozwiązywania wielkoskalowych problemów nieliniowych. Analiza i badania hydrodynamiki pewnej liczby upakowań regularnych pokazały, że upakowania komórkowe i sieciowe są obiecujące dla realizacji trybu odwrócenia fazy. Zaproponowana koncepcja zintensyfikowania procesów wymiany ciepła w aparatach kolumnowych oparta jest o zastosowanie warstw różnych upakowań ułożonych w następującej kolejności w aparacie: typ 1 – komórka, typ 2 – sieć. Jednocześnie ich główne cechy geometryczne znacznie różnią się od siebie. Jednakże, struktura upakowania luźnego jest niejednorodna, co utrudnia realizację stabilnego trybu lokalnego odwrócenia fazy w tych warunkach. Jest to spowodowane strukturą aparatów kolumnowych z upakowaniem luźnym, w których blisko ścian aparatu istnieje zwiększony udział porów (porowatość). Porowatość jest bardzo znacząca; może sięgać do 40%, a w efekcie lokalna prędkość blisko ścian przekracza prędkość w środku aparatu o wartość do 70%. Dla odmiany, zastosowanie regularnych struktur upakowania czyni ten potencjalnie wysoce wydajny tryb technicznie możliwym.
Źródło:
Nafta-Gaz; 2023, 79, 12; 804-808
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1166

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