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Tytuł:
On the purpose and functions of legal‑dogmatic research (continental tradition)
Autorzy:
Vachev, Valeri
Powiązania:
https://bibliotekanauki.pl/articles/48899534.pdf
Data publikacji:
2024-03-09
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
analysis
synthesis and interpretation of legal norms
criminal law
jurisprudence
theory and philosophy of law
Opis:
The present text discusses the role of a special kind of research into criminal law in the continental legal tradition, for which the term “legal-dogmatic research” has been adopted and used by many scholars from outside the common law system and which is described in more detail below, its place among other scholarly disciplines, and its significance for legal practice. The concept of this “legal-dogmatic research” can be understood in two ways. Based on the first approach, it is perceived as an abstract study of law independent on the legal rules in force at a given time and place. In this sense, it appears as synonymous to terms used in the German language: Doktrin or Lehre (study). In the second sense, this research is seen as a study of existing law (lex lata) – and nothing else. It differs from other areas of jurisprudence in that it does not strive to be universally valid, but is confined to a time and place. The article presents a point of view in the light of which this research aims to render the normative system coherent and comprehensible, i.e. to establish the correct meaning of the law by clarifying and systematizing it. In this context, the author shows that the purpose of legal scholarship is to reveal and subsequently to conceptualize reality. At the same time, the importance of investigation of the law as it is (legal-dogmatic research) is by no means limited to the hermeneutical analysis of the legal text, but that it faces equally ambitious tasks, such as the development of criminal law and the need to find material legitimacy for the use of coercion by the state against citizens.
Źródło:
Studia Iuridica; 2023, 100; 289-299
0137-4346
Pojawia się w:
Studia Iuridica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach to phosphorylation of nucleosides using oxyonium phosphobetaines as intermediates
Autorzy:
Materna, Magdalena
Stawinski, Jacek
Sobkowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/16673995.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
synthesis
phosphorylation
N-oxides
nucleotides
oxyonium phosphobetaines
H-phosphonates
Opis:
Oxyonium phosphobetaines are recently discovered molecules with a unique ¯O–P–O–N+ bond system, which makes them useful and versatile intermediates for the synthesis of phosphates and their derivatives. In this paper, the preliminary data on the application of these compounds in nucleoside phosphorylation were presented.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2023, 104, 1; 93-99
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical Method of Copper Powder Synthesis on Rotating Electrode in the Presence of Surfactants
Autorzy:
Wojtaszek, K.
Cebula, F.
Partyka, B.
Deszcz, P.
Włoch, G.
Socha, R. P.
Woźny, K.
Żabiński, Piotr
Wojnicki, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2203711.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper powder
electrochemical synthesis
rotating electrode
ethylene glycol
Opis:
This paper presents a method of synthesizing copper powders by electrochemical method with the use of a rotating working electrode. The influence of the rotation speed of the working electrode, the current density, the concentration of copper ions, and the addition of ethylene glycol on the shape, size, and size distribution of the obtained powders were investigated. Properties of the synthesized powders were characterized by scanning electron microscopy (SEM) and X-ray powder diffractometry (XRD). It has been shown that it is possible to obtain copper powders with a size of 1 µm by an electrochemical method using the rotary cathode, in sulphate bath with addition of ethylene glycol as a surfactant. Increasing current density causes a decrease in the average size of the obtained powder particles. The addition of 2.5% of ethylene glycol prevents the formation of dendritic powders. The change in the concentration of copper ions in the range from 0.01 to 0.15 mol/dm3 in the electrolyte did not show any significant effect on the size of obtained particles. However, higher concentrations of copper limiting the presence of dendritic-shape particles. Changing the speed of rotation of the electrode affects both the size and the shape of synthesized copper powder. For the rotational speed of the electrode of 115 rpm, the obtained powders have a size distribution in the range of 0-3 µm and an average particle size of 1 µm. The particles had a polygonal shape with an agglomeration tendency.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 375--386
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equivalent diagrams of fractional order elements
Autorzy:
Różowicz, Sebastian
Włodarczyk, Maciej
Zawadzki, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/27324011.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
fractional order derivative
Laplace transform for fractional order systems
CFE method
circuit synthesis
numerical experiments
Opis:
This paper presents equivalent impedance and operator admittance systems for fractional order elements. Presented models of fractional order elements of the type: sαL,sub>α and 1/sαCsub>α, (0 α 1) were obtained using the Laplace transform based on the expansion of the factor sign to an infinite fraction with varying degrees of accuracy – the continued fraction expansion method (CFE). Then circuit synthesis methods were applied. As a result, equivalent circuit diagrams of fractional order elements were obtained. The obtained equivalent schemes consist both of classical RLC elements, as well as active elements built based on operational amplifiers. Numerical experiments were conducted for the constructed models, presenting responses to selected input signals.
Źródło:
Archives of Control Sciences; 2023, 33, 4; 801--827
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inférences au pays de la prosodie
Inferences in the land of prosody
Autorzy:
Banyś, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/31341247.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Implication
entailment
presupposition
implicature
prosody
theme
rheme
two-way implicative verbs
one-way implicative verbs
text-to-speech synthesis
Opis:
When it comes to language, it’s not just the grammatical structure and the literal meaning of words that matter. The way a predicate imposes inferences on its propositional arguments is crucial to understanding the true meaning of a message. However, these inferences are influenced by many factors, such as prosody, world knowledge, speakers’ expectations regarding language use, situational stereotypes, and other implicit or contextual elements.In this paper, we examine the inferential status of the verbs referred to by Karttunen as “implicative verbs”. On the one hand, two-way implicative verbs, and on the other, one-way implicative verbs. The latter have been little studied from this perspective. This will lead us to highlight the fundamental role, too often forgotten, of prosody and focus/theme in this type of analysis and in determining the inferential status of predicates. Our analyses show that, once prosody has been considered, the classification of theoretically possible verb inferences accepted until now needs to be modified. We do not have 4 groups of one-way implicative verbs, as has been argued, but 2, namely the groups: [+/+/– // –/–] [affirmed > true or false // denied > false] of the type être capable, pouvoir and [+/+/– // –/+] [affirmed > true or false // denied > true] of the type hésiter à.The remaining two groups, considered as distinct and autonomous one-way implicative verbs with the suggested characteristics: [+ + // – +/–] [affirmed > true // denied > true or false] of the type forcer to and [+ – // – +/–] [affirmed > false // denied > true or false] of the type refuser de, belong to the canonical groups of two-way implicative verbs, respectively: forcer à to the group of verbs of the type réussir à: [+/+ // –/–] [affirmed > true // denied > false] and refuser de to the group of verbs of the type oublier de: [+/– // –/+] affirmed > false // denied > true].Naturally, this classification differentiation, important as it is, only reflects the different behaviour of certain types of predicate, and this is the most important element of these analyses with a view to automating the recognition of predicate inferences.
Źródło:
Neophilologica; 2023, 35; 1-33
0208-5550
2353-088X
Pojawia się w:
Neophilologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal-organic frameworks for efficient drug adsorption and delivery
Autorzy:
Hyjek, Kornelia
Jodłowski, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/35134841.pdf
Data publikacji:
2023
Wydawca:
Radomskie Towarzystwo Naukowe
Tematy:
drug delivery systems
metal-organic frameworks
synthesis
characterization
drug loading
biocompatibility
systemy dostarczania leków
sieć metalo-organiczna
synteza
charakterystyka
akumulacja leku
biokompatybilność
Opis:
In recent years, the number of materials used as drug delivery systems (DDS) has increased dramatically. The widespread use of DDSs has improved both the safety and efficacy of therapy. The systems currently in use pose numerous drawbacks and require proper improvements. Although many modern materials are being developed, metal-organic frameworks (MOFs) deserve special attention. Thermal and chemical stability, high specific surface area, low toxicity, high biocompatibility, and great potential for modification are the main features enabling MOFs to be used as DDS. In this review, we describe MOFs, their structure, synthesis, and characterization, as well as drug loading, drug release kinetics, and bioassays. A critical approach is to outline the disadvantages as well as the limitations of MOFs and to identify areas that need to be studied more thoroughly. Nonetheless, the prospective nature of MOFs as DDS and potential adsorbents in overdose or poisoning is presented and highlighted.
Źródło:
Scientiae Radices; 2023, 2, 2; 115-189
2956-4808
Pojawia się w:
Scientiae Radices
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal SAT Solver Synthesis of Quantum Circuits Representing Cryptographic Nonlinear Functions
Autorzy:
Jagielski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/27311913.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
quantum computing
circuit synthesis
cryptography
satisfiability problem
Opis:
In this article we present a procedure that allows to synthesize optimal circuit representing any reversible function within reasonable size limits. The procedure allows to choose either the NCT or the MCT gate set and specify any number of ancillary qubits to be used in the circuit. We will explore efficacy of this procedure by synthesizing various sources of nonlinearity used in contemporary symmetric ciphers and draw conclusions about properties of those transformations in quantum setting. In particular we will try to synthesize optimal circuit representing ASCON cipher SBOX which recently won NIST competition for Lightweight Cryptography standard.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 2; 261--267
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Otrzymywanie i właściwości biologiczne racemicznych i optycznie czynnych laktonów z pierścieniem aromatycznym w pozycji β
Synthesis and biological properties of racemic and optically active lactones with aromatic ring on β-position
Autorzy:
Gładkowski, Witold
Powiązania:
https://bibliotekanauki.pl/articles/27310041.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
laktony
synteza chemoenzymatyczna
konfiguracja absolutna
aktywność antyproliferacyjna
aktywność antyfidantna
lactones
chemoenzymatic synthesis
absolute configuration
antiproliferative activity
antifeedant activity
Opis:
Natural and synthetic lactones containing an aromatic ring exhibit a number of biological properties, e.g. antiproliferative, antifeedant or antimicrobial activity. This review deals with the synthesis and biological properties of lactones containing an aromatic substituent in the β-position of the lactone ring. The described group of compounds includes halolactones, hydroxylactones, unsaturated lactones and products of reductive dehalogenation of iodolactones. In addition to chemical transformations, biotechnological methods for obtaining optically active lactones have also been described, including the use of lipases in the chemoenzymatic pathway leading to the production of halolactones, kinetic separation of hydroxylactones in the process of enzymatic transesterification, microbial hydrolytic dehalogenation of iodolactones and enantioselective hydrolysis of the lactone ring. The biological activity of the obtained β-aryllactones was also briefly characterized.
Źródło:
Wiadomości Chemiczne; 2023, 77, 5-6; 509--531
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of silver from chloride solutions using new polymer materials
Autorzy:
Pilśniak-Rabiega, Magdalena
Wolska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/27323667.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
synthesis
polymer resin
sorption
desorption
selectivity
chloride solution
Opis:
This work presents the synthesis of polymer resins with heterocyclic functional groups, that is, N-(3-aminopropyl)-2-pipecoline, N-(3-aminopropyl)-2-pyrrolidinone, and trans-1,4-diaminocyclohexane for the recovery of Ag(I) from chloride solutions. The modification yield was 69.2, 74.6 and 88.3%, respectively. The best Ag(I) sorption was achieved from synthetic and real chloride solutions in the case of trans-1,4-diaminocyclohexane resin (sorption was 26.8 and 21.5 mg/g, respectively). The sorption kinetic data were well fitted to the pseudo-first-order kinetic model. The maximum sorption capacity of Ag(I) is 105.4, 117.8 and 130.7 mg Ag(I)/g for N-(3-aminopropyl)-2-pipecoline resin, N-(3-aminopropyl)-2-pyrrolidinone resin and trans-1,4-diaminocyclohexane resin, respectively. The trans-1,4-diaminocyclohexane modified resin was very selective towards Ag(I) compared to Cu(II), Pb(II), and Zn(II) from the real chloride leaching solution. The N-(3-aminopropyl)-2-pipecoline and N-(3-aminopropyl)-2-pyrrolidinone resins showed high preferences for Ag(I) over Pb(II) in real solution. These results indicated that the polymers can be applied in the recovery of Ag(I).
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174357
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the modified echo highlight model for underwater vehicles with combined structures
Autorzy:
Xie, Xin
Liu, Fanghua
Jin, Guangwen
Liu, Jinwei
Xu, Cong
Peng, Zilong
Powiązania:
https://bibliotekanauki.pl/articles/34609383.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
modified highlight model
wedge-shaped convex structure
piecewise synthesis method
acoustic scattering calculation software
Opis:
The highlight model is widely used as a simple and convenient method in the radar field but its accuracy is not high. Based on the traditional highlight model, the algorithm has been improved to address the acoustic scattering problems of underwater vehicles with more complex line shapes. The basic idea is to partition the model into micro-bodies to calculate the scattered sound pressure, consider the phase interference of each part, and then synthesise the scattered sound pressure to approximate the target’s actual shape. A computational model of the wedge-shaped convex structure on the back of the underwater vehicles is developed using a highlight model of a trapezoidal plate. The results of the calculations using the highlight model approach are consistent with those of the planar element method. Utilising the modified highlight model method, the accuracy of acoustic scattering characteristics calculations for the stern and overall structures of underwater vehicles has proven satisfactory. Finally, fast acoustic scattering prediction software is developed for underwater vehicles, enabling the calculation of the acoustic scattering characteristics for individual structures, combined structures, and coated silent tiles. This software provides algorithmic support for the fast prediction of the acoustic stealth performance of underwater vehicles.
Źródło:
Polish Maritime Research; 2023, 3; 163-173
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sieci metalo-organiczne typu MOF jako przykład mateiałów wykorzystywanych w ukierunkowanej terapii przeciwnowotworowej
MOF-type metal-organic networks as an example of materials used in targeted anti-cancer therapy
Autorzy:
Samaszko-Fiertek, Justyna
Khalatyan, Alina
Dmochowska, Barbara
Ślusarz, Rafał
Madaj, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2200429.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
MOF
ZIF-8
terapia przeciwnowotworowa
synteza ZIF-8
system dostarczania leków
anticancer therapy
synthesis ZIF-8
drug delivery system
Opis:
MOF materials (metal-organic frameworks) are a relatively organic-inorganic (hybrid) materials. Due to very good adsorption properties, large specific surfaces and large pore volumes, these compounds are quite intensively studied, and the number of organic-inorganic hybrids obtained is growing year by year. Most MOF compounds are crystalline two- or three-dimensional organometallic structures. They are an example of hybrid materials that are made of both inorganic and organic component. The inorganic part is represented by metal ions/clusters, while the organic skeleton contains neutral or charged organic linkers [1-3]. The most common metal cations included in organometallic lattices are: Zn2+, Cu2+, Cr3+, Al3+ and Mg 2+. Organic ligands can be neutral, positively or negatively charged, but they must be primarily electron pair donors, which means that they have nitrogen or oxygen-containing functional groups in their structure. Ligands’ role is to stitch these building units together to create extended framework structures, while metal ions provide structural integrity and durability. These materials have a well-developed specific surface and a large pore volume (570-3800 m2/g). Thanks to the presence of coordination bonds in the structure, the skeletons of organometallic networks are flexible. Based on literature data, several methods of cancer treatment using MOFs are distinguished, e.g.: using passive targeting, active targeting, physicochemical targeting, and in a particular case using all three strategies (Fig. 2, Table 1) [12,13]. The ongoing work on the modification of the synthesized MOF structures based on zinc ions allows the preparing various types of cancer drugs based on their durability and high porosity. The ability to synthesize multifunctional Zn-MOFs is a new chapter in the design of chemotherapeutic agents. A particular example is ZIF-8. The combination of different strategies for the influence of the pH value of the environment or photochemical elements gives the opportunity to use the compounds in imaging and cancer diagnosis.
Źródło:
Wiadomości Chemiczne; 2023, 77, 1-2; 35--53
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of pneumatic systems in the control of the transport line of rolling elements
Autorzy:
Szcześniak, Adam
Szcześniak, Zbigniew
Cedro, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/2204617.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
pneumatic systems
delay execution systems
synthesis
verification of sequential systems
Opis:
This paper presents the synthesis of a pneumatic control system for a selected configuration of the transport path for the delivery of rolling elements to spiral storage in inter-operational transport. The sequential control system sets the state of the manifolds to ensure a flow of workpieces to serve the subsequent storage. The essential module of the control system is the memory block. It is developed based on a storage filling sequence graph. The filling level of the storages can be monitored in one or two points using sensors. The rolling element displacement control sensors work together with appropriately designed systems to execute the delay of the rising and falling edge input signal. By using a two-level control of the filling level of the storages, it is possible to control the emptying status of the storages as a function of the technological time of removal of the items from the storage between the two control points. Control systems were synthesised and verified using Festo’s FluidSim computer programme.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 2; 254--262
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of silver nanoparticles by aqueous extract of Zingiber officinale and their antibacterial activities against selected species
Autorzy:
Hussain, Zawar
Jahangeer, Muhammad
ur Rahman, Shafiq
Ihsan, Tamanna
Sarwar, Abid
Ullah, Najeeb
Aziz, Tariq
Alharbi, Metab
Alshammari, Abdulrahman
Alasmari, Abdullah F.
Powiązania:
https://bibliotekanauki.pl/articles/27315653.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Nanotechnology
Antibacterial activity
Silver-nanoparticles
green synthesis
Ginger
Opis:
Silver nanoparticles have special plasmonic and antibacterial characteristics that make them efficient in a variety of commercial medical applications. According to recent research, chemically synthesized silver nanoparticles are harmful even in low concentrations. It was crucial to identify appropriate synthesis methods that may have low costs and be nontoxic to the environment. Zingiber officinale (ginger) extracts used to prepare silver nanoparticles were inexpensive and environmentally friendly, and the best physicochemical characteristics were analyzed. Silver nanoparticles were characterized by using UV-visible spectroscopy, Scanning electron microscopy (SEM), and X-ray diffraction (XRD). The surface Plasmon resonance peak at 425 nm was observed using UV-Visible spectroscopy. Scanning electron microscopy observed that the nanoparticles were spherical and ranged in size from 5 to 35 nm. The XRD pattern values of 2θ: 38.2° , 46.3° , and 64.58° are used to determine the planes (111), (200), and (220). The silver nanoparticle’s existence was verified by the face-centered cubic (FCC). Silver nanoparticles were found to have antibacterial efficacy against gram-positive Staphylococcus and gram-negative bacteria such as Pseudomonas aeruginosa, Klebsiella Aerogenes, Salmonella, Staphylococcus and Escherichia coli. The antibacterial activity of silver nanoparticles was observed using the agar well diffusion (AWD) method at three different concentrations (100 μg/ ml, 75 μg/ml, and 50 μg/ml). The zone of inhibition measured against the bacterial strains pseudomonas Aeruginosa, Klebsiella aerogenes, Escherichia coli, Salmonella and Staphylococcus which were (18.4±1.25 mm, 16.9±0.74 mm, 14.8±1.25 mm), (16.8±0.96 mm, 14.6±0.76 mm, 14.0±1.15 mm), (19.7±0.76 mm, 18.2±0.66 mm, 15.4±1.15 mm), (16.6±0.67 mm, 14.2±0.23 mm, 12.8±0.78 mm) and (12±0.68 mm, 10±0.20 mm, 08±0.15 mm). These nanoparticles’ potent antibacterial properties may enable them to be employed as nanomedicines for a variety of gramnegative bacterial illness treatments.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 3; 23--30
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technology mapping of multi-output functions leading to the reduction of dynamic power consumption in FPGAs
Autorzy:
Opara, Adam
Kubica, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/11542700.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
low power synthesis
FPGA
switching activity
technology mapping
czynność przełączania
mapowanie technologii
Opis:
This article presents a synthesis strategy aimed at minimizing the dynamic power consumption of combinational circuits mapped in LUT blocks of FPGAs. The implemented circuits represent the mapping of multi-output functions. Properly selected multi-output functions are described using a new form of the binary decision diagram (BDD), which is an extension of pseudomulti-terminal BDDs (PMTBDDs) in the literature. The essence of limiting power consumption is to include additional parameters during decomposition, such as the switching activity associated with the switching PMTBDD (SWPMTBDD). In addition, we highlight the key importance of circuit optimization methods via non-disjoint decomposition when minimizing power consumption. An algorithm is proposed to assess the effectiveness of decomposition, considering several parameters, such as the number of non-disjoint decompositions as well as that of shared and non-shared bound functions or the switching activity. The results of experiments that demonstrate the effectiveness of the proposed methods are also included.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2023, 33, 2; 267--284
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of alkaline promoters on the properties of the Ni/HAp catalyst in the methane dry reforming reaction
Autorzy:
Cichy, Marcin
Zawadzki, Witold
Powiązania:
https://bibliotekanauki.pl/articles/29521159.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrogen
synthesis gas
nickel catalyst
dry reforming
coking
alkaline promoter
Opis:
The reforming of methane with carbon dioxide is still of great interest due to the ever-increasing demand for synthesis gas and hydrogen. This process makes it possible to use two major gases that are considered harmful to the environment. The main problem for its commercial application is the lack of a catalyst that is both active, selective towards syngas (a mixture of hydrogen and carbon monoxide) and resistant to deactivation by coke deposition. Nickel is the most commonly used metal in methane reforming reactions due to its high activity and reasonable price. But still there is a gap in the literature for research on novel catalysts and their properties modifications devoted to strategies to reduce deactivation of the catalysts caused by the coke formation. In the present work a series of hydroxyapatite supported nickel catalysts promoted by alkali metals (Li, Na, K and Cs) were tested. The surface and structural properties of the catalysts were well characterized by physicochemical methods. Activity and selectivity were measured at 600ºC for 20 hours’ time-on-stream test. Resistance to coking was measured with Magnetic Suspension Balance. The stability of the catalyst was improved by the addition of promoters, which reduced the rate of coking. In particular, the cesium-promoted Ni/HAp catalyst significantly inhibited coke deposition, while slightly reducing methane conversion and selectivity to hydrogen.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 182856
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 695

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