bluuebunny/crossref_metadata_2025 huggingface dataset:
EVALUATION OF CONTINUOUS AND WATER ALTERNATING GAS (WAG) CO2 INJECTION ON X FIELD RECOVERY FACTOR
Authors: Ababil Pijar Fitrah , Hadziqul Abror  , Riska Laksmita Sari
Published: January 2024

Indonesia is a country rich in natural resources. The wealth of Indonesia's natural resources is not only limited to agricultural and plantation products, but also from mineral and hydrocarbon mining or oil and gas. Indonesia's oil production has continued to decline in the last 10 years until the national consumption rate is much higher than national production. One of the causes of the decline in oil production in Indonesia is the condition of Indonesia's oil fields, which are currently mature fields. To overcome the problem of old fields that still have economic oil reserves, enhanced oil recovery (EOR) can be used. One of the EOR methods that can be used is the CO2 injection method using continuous and WAG injection schemes. The study was conducted in X field with oil-wet carbonate rock composition with waterdrive and fluid expansion driving mechanism. The basecase production scheme using 5 production wells produces a recovery factor of 34.3%, while continuous CO2 injection produces a recovery factor of 32%, and CO2-WAG produces a recovery factor of 42%. Continuous CO2 injection has the lowest recovery factor because early gas breaktrough occurs due to a large mobility ratio and causes gas fingering, hindering the oil production process. The most suitable injection method is CO2-WAG 1 cycle using a 1:1 ratio, CO2 injection volume of 6.661 MSCF/D, injection water volume of 37.4 MBBL/D with a recovery factor of 43.46%.
Organic Geochemical Evaluation of the Black Shale interbeds Within the Lithological Succession of the Al Aziziyah Formation, NW Libya
Authors: Burgan Amer
Published: January 2024

The samples under investigation represent the black shale in interbeds within the Al Aziziyah Formation, located in the NW part of Libya and were analysed using geochemical techniques method and a variety of organic geochemical parameters. The aim of this study is to assess the type of organic matter, thermal maturity, and environment of deposition, based on biomarker distributions and Rock-Eval pyrolysis. The Gas chromatograms of the saturated hydrocarbon fractions of the study samples display a smooth high-end member distribution of the n- n-alkanes extending beyond nC34. The sample displayed evidence of biodegradation as suggested by the presence of the loss of some of the lower molecular weight n-alkanes. The predominance of high molecular weight n-alkane in the study sample suggests a significant input of higher land plant organic matter into these sediments. Geochemical (Rock-Eval, Tmax. values ranging from 416-4390C typical of immature range). Another related feature of these rocks extracted is the presence of a high relative abundance of gammacerane, indicating an anoxic marine hypersaline source depositional environment. The relatively high abundance of common land-plant-derived biomarkers, such as oleananes, is a clear indication of major terrigenous input to the source of these extractable organic matters. The high abundance of C24 tetracyclic terpanes could be associated with higher land-plant, algae, or microbial sources, thereby suggesting a mixed source input. TOC valued < 0.5 wt.%, in the analyzed samples can be considered as a poor source rock generative potential. Based on this study, it can be said that the interbedded shales of the Al Aziziyah Formation seem to have received substantial amounts of land-derived organic matter that has been transported into an open marine subtidal depositional setting had prevailed and was deposited in a photosynthetic-organisms dominated environment (thereby suggesting a mixed source input).
Investigation Into Local Additives as Substitute to Standard Viscosifier; Advances in Drilling Technology
Authors: Amadi Godswill , Boyi George
Published: January 2024

In Nigeria, drilling companies import a bulk of drilling fluid materials that they use to carry out their respective operations. This has been a major concern to oil and gas industries since these drilling fluid materials cannot be recycled, are highly expensive in terms of foreign exchange, are not environmentally friendly, not very effective, and non-biodegradable. This work presents an experimental investigation into the reliability of the use of local materials as a substitute to conventional viscosifiers. Local materials used in the analysis are mucuna solannie (Ukpo), brachystegia eurycoma (Achi), and detarium microcarpium (Ofo). The results obtained from the experimental analysis show that they compared closely to the standard viscosifer formulated with Pac-R. The results showed that the density, specific gravity, pH, yield stress, gel strength, plastic viscosity, and yield point of mud formulated from local materials compared favorably with that of the imported viscosifier. An increase in concentration of the local sample also favoured its potential to replace the Pac-R. In terms of cost, cutting carrying ability, and positive environmental impacts, the local materials could serve the Nigerian drilling company better.
Art, mythe et science : à propos des travaux de Friedrich Nietzsche sur l’art athénien du Vème siècle av. J.-C. et propositions pour une caractérisation sémiotique de l’art au sein de l’espace culturel contemporain
Authors: Guillén Santiago
Published: January 2024

Cet article étudie les travaux de Friedrich Nietzsche sur l’art et plus particulièrement sur l’art tragique du VIè et Vè siècles avant notre ère à Athènes dans le but d’élaborer une proposition de définition de l’art en relation au mythe et à la science dans notre société contemporaine. Après avoir expliqué les thèses de Nietzsche qui voit dans la tragédie attique le résultat de la rencontre entre deux puissances artistiques : le dionysiaque (l’art musical) et l’apollinien (l’art visuel), nous nous interrogeons sur la possibilité de caractériser la forme artistique comme le résultat d’un parcours génératif qui va de l’énergie modale vers la structuration figurative et narrative jusqu’à son implémentation sur le plan des pratiques. Considérant que l’art est définissable en tant que forme symbolique (Cassirer), notre étude caractérise l’art en le contrastant à d’autres formes symboliques et institutions sociales, comme la science, le langage (verbal) ou le mythe. Mais alors : en quoi les originalités de notre sémiosphère contemporaine et en particulier les relations entre les différentes formes symboliques telles que l’art, le langage verbal, le mythe et la science conditionnent-elles l’émergence de l’art d’aujourd’hui ?
The Teaming Initiative: Establishing of New European Centers of Excellence in Plant Biology and Medicine
Authors:   Center of Plant Systems Biology and Biotechnology, Plovdiv 4023, Bulgaria, Kazakov Petar , Atanasov Dimo ,   Agricultural University of Plovdiv, Plovdiv 4000, Bulgaria, Gechev Tsanko ,   Center of Plant Systems Biology and Biotechnology, Plovdiv 4023, Bulgaria
Published: January 2024

The Teaming programme is a new funding instrument of the European Commission aimed at closing the research and innovation gap between the leading and lagging EU countries by establishing new research centers. The new centers of excellence are located in the so called widening, countries, and are created in partnership with advanced institutions from European regions with high research and innovation index. Here we describe the new research institutes in the field of plant biology and medicine from the first two Horizon 2020 Teaming calls. We analyze the financial investment by the European Commission through the Teaming instrument, as well as the Governmental co-funding and the contribution of the advanced partner institutions and local authorities. With these collective efforts, these institutes have quickly become the drivers of scientific and socio-economic developments of their respective countries.
Railway Station Names as Spatio-temporal Media
Authors:   Institute For Kyeongki Cultural Studies, Todoroki Hiroshi , Kim Somin
Published: January 2024

This paper is a semantic study of the relationship between Korean railway station names and place names where they locate. A railway station is a transportation node that represents identity of the region. Therefore, station names are required to be symbols that represent the area. Place names are sometimes changed to match station names. Conversely, sometimes station names are changed to match the place name. The triggers include changes in administrative areas, the opening of railway lines, or movement of urban areas, administrative centers.
Station names must be able to appropriately guide domestic and foreign passengers. Therefore, a high degree of publicity and public benefit are naturally required. It has nothing to do with whether the railway company is publicly owned or privately owned. Therefore, deciding on or changing station names requires the involvement of not only railway companies, but also local communities and local governments, just as with place names. Therefore, they have a very close relationship with authority. On the other hand, it must be kept in mind that public interest can easily be undermined by authority, so as not to abuse it.
A Study on the Patterns of Social Conflict and Reasonable Solutions on the Establishment and Revision of the Name of Railway Station: Proposing the Historicity of the Name of the Railway Station
Authors:   Institute For Kyeongki Cultural Studies, Lee Yong Sang , Chung Byung Hyun
Published: January 2024

In modern society, railways are Korea's core means of transportation that provide equitable convenience to all citizens, making a profound contribution to the welfare of the people. The railway station is not just a point where trains stop, but also a place of history and culture that informs an area, a place where various cultural events and social exchanges take place, and a space for various commercial and economic activities. Therefore, the station name, the name of the railway station, is very symbolic and has a complex influence in history, culture, society, and economy. The enactment or revision of the station name is a key means of transportation that contributes to the welfare of the people, and the task is to be reasonably and objectively improved in consideration of the symbolic and complex influence and ripple effect of the railway station name involved in regional identity. This paper aims to improve the standard of route name, station name, and station name bookkeeping that meets public satisfaction and expectations by improving the standard of reasonable railway line name, station name, and station name bookkeeping. The public's interest in railway station names is growing more than ever, and measures to improve objective standards were proposed not only by preventing unnecessary conflicts between different local governments and social organizations, but also by reviewing reasonable station names and standards for station bookkeeping to meet public interest and expectations. In this analysis, a plan was also suggested to consider the historical meaning of the railway station name together.
A Study on the Improvement of Naming Standards of Korean Railway Lines and Stations
Authors:   Institute For Kyeongki Cultural Studies, Jeon Jong Han
Published: January 2024

Railroad lines and stations are not just physical spaces, but representations of local and regional identities, geographic information for social information communication, and important operational tools related to safety and speed for facility management and operators. Frequent complaints over the recent establishment of railway station names not only show public interest in railroad-related nominations, but also call for efforts for standardization of geographical names and rational improvement of route names and station names based on the establishment of standards. The researcher diagnosed the limitations and development tasks of the current guidelines based on the principles and recommendations of the UN Group of Experts on Geographical Names and the National Geographical Name Committee based on the correct terminology based on the law and the clarification of key concepts open to implicit interpretation, and proposed ways to improve the standards for establishing railway line names and station names. The improvement measures are summarized as follows. First, the naming of the railway lines follows the combination of the representative administrative name of the departure area and the destination area. However, along with these official line names, facility managers and operators can use the name of the station by naming method using the railway line type classification system or a combination of alphabets and Arabic numbers to promote the safety and speed of management and operation. Second, the naming of a station uses only the name of the representative administrative district where the station building is located. In a station building that spans two or more administrative districts, two or more administrative names can be consecutively used to those naming, but in this case, the name of the administrative district corresponding to the representative address shall be prioritized. Third, other improvements include the following: In principle, the standards for naming of railway lines and stations to be improved in the future should not be applied retroactively, the revision of the station name once rejected should not be allowed to be re-appointed as a future agenda, and caution against social exclusion, such as nominations for specific persons or commercial purposes, or names that can be linked to the economic interests of specific subjects.
Tag-Free Protein Modification by Lipoate Ligase A: Exploring Substrate Tolerance
Authors: Yamazaki Shunsuke , Takahashi Kazutoshi , Matsuda Yutaka
Published: January 2024

This study delves into the functional intricacies of lipoate ligase A (LplA), an enzyme showing great promise in bioconjugation due to its unique capacity for introducing azido groups into proteins without requiring a genetic tag. We aimed to enhance the understanding of LplA's functionality, particularly its substrate tolerance and the reliability of various analytical techniques. A pivotal aspect of our approach was incorporating azido groups into a range of proteins, followed by the addition of the fluorescent molecule Cy3 via click chemistry. Analysis of fluorescent intensity in the altered proteins indicated varying degrees of conjugation. Additionally, phenyl resin-based RP-HPLC facilitated effective separation of modified proteins, unmodified proteins, and remaining fluorescent tags post-separation. SASA analysis provided insights into conjugation trends, guiding the identification of proteins amenable to LplA's tag-free modification. Our findings demonstrate LplA's broad substrate tolerability for protein modification.
Transdermal hydrogen sulfide delivery enabled by open metal site metal-organic frameworks
Authors: Mandel Ruth , Lotlikar Piyusha , Runcevski Tomce , Lee Jung-Hoon , Woods Joshua , Pitt Tristan , Wilson Justin , Milner Phillip
Published: January 2024

Hydrogen sulfide (H2S) is an endogenously produced gasotransmitter involved in many physiological processes that are integral to proper cellular functioning, including chemical signaling, redox balancing, and modification of vital proteins. Due to its profound anti-inflammatory and antioxidant properties, H2S plays important roles in preventing inflammatory skin disorders and improving wound healing. Transdermal H2S delivery is a therapeutically viable option for the man-agement of such disorders. However, current small-molecule H2S donors are not optimally suited for transdermal deliv-ery and typically generate electrophilic byproducts that may lead to undesired toxicity. Here, we demonstrate that H2S release from metal-organic frameworks (MOFs) bearing coordinatively unsaturated metal centers is a promising alterna-tive for controlled transdermal delivery of gaseous H2S without the release of unwanted byproducts. In particular, exten-sive gas sorption measurements and powder X-ray diffraction (PXRD) studies of eleven MOFs support that the Mg-based framework Mg2(dobdc) (dobdc4− = 2,5-dioxidobenzene-1,4-dicarboxylate) is uniquely well-suited for transdermal H2S delivery due to its strong yet completely reversible binding of H2S, high capacity (14.7 mmol/g or 33.3 wt% at 1 bar and 25 °C), and lack of toxicity. In addition, Rietveld refinement of high-quality synchrotron PXRD data from a H2S-dosed mi-crocrystalline sample of Mg2(dobdc) supports that the high H2S capacity of this framework arises due to the presence of three distinct binding sites: at the Mg centers through a Mg⋅⋅⋅S interaction (primary site), through a short S⋅⋅⋅S interaction to the polarized H2S molecules at the primary sites (secondary site), and in the center of the pores (tertiary site). Last, we demonstrate that transdermal delivery of H2S from this framework is sustained over a 24 h period through porcine skin. Not only is this significantly longer than sodium sulfide (Na2S), but this represents the first example of controlled trans-dermal delivery of pure H2S gas. Overall, H2S-loaded Mg2(dobdc) is an easily accessible, solid-state source of H2S, ena-bling safe storage and transdermal delivery of this therapeutically relevant gas.
Transition metals vs. chalcogens: the impact on NOx adsorption on MoS2, MoSe2 and WS2 transition-metal dichalcogenides
Authors: Radomski Piotr , Szary Maciej
Published: January 2024

The widely developed industry of today generates significant amounts of harmful gases, which prompts the search for modern materials allowing for their efficient and reliable detection. Transition-metal dichalcogenides (TMD) constitute well-known example of such, with particularly high potential for excellent sensing of NO2. It is known, that the adsorption of this hazardous molecule varies on the TMD composition, however the importance of transition metal and chalcogen types were never previously contrasted. Moreover, the other NOx compounds, namely NO and N2, interact much less with TMD sheets, the reason for which is not yet well understood. This work utilizes density functional theory (DFT) approach to untangle these problems by examining the adsorption processes of NO2, NO, and N2 on the monolayers of WS2, MoS2, and MoSe2. The calculations allowed to establish two important conclusions: (i) the chalcogen is significantly more important than transition metal, allowing for much greater increase in adsorption of NO2 on MoSe2 than on WS2, as compared to that on MoS2, (ii) only molecules acting as an acceptor with respect to the TMD sheet can benefit from the enhancement coming from the composition of the latter. The gained insight can likely contribute to the informed design of devices allowing selective detection, the lack of which is a recognized problem among semiconductor sensors.
Multimaterial 3D Laser Printing of Cell-Adhesive and Cell-Repellent Hydrogels
Authors: Schwegler Niklas , Gebert Tanisha , Villiou Maria , Colombo Federico , Schamberger Barbara , Selhuber-Unkel Christine , Thomas Franziska , Blasco Eva
Published: January 2024

This study introduces a straightforward method for manufacturing 3D microstructured cell-adhesive and cell-repellent multimaterials using two-photon laser printing. Compared to existing strategies, this approach offers bottom-up molecular control, high customizability and rapid and precise 3D fabrication. The printable cell-adhesive PEG-based material includes an RGD-containing peptide synthesized through solid-phase peptide synthesis, allowing for precise control of the peptide design. Remarkably, minimal amounts of RGD peptide (< 0.1 wt%) suffice for imparting cell-adhesiveness, while maintaining identical mechanical properties in the 3D printed microstructures to those of the cell-repellent, PEG-based material. Fluorescent labeling of the RGD peptide facilitates visualization of its presence in cell-adhesive areas. To demonstrate the broad applicability of our system, we showcase the fabrication of cell-adhesive 2.5D and 3D structures, fostering the adhesion of fibroblast cells within these architectures. Thus, this approach allows for the printing of high-resolution, true 3D structures suitable for diverse applications, including cellular studies in complex environments.
Heteroepitaxial MOF-on-MOF photocatalyst for solar-driven water splitting
Authors: Le Huec Thibaut , López-Francés Antón , Abánades Lázaro Isabel , Navalón Sergio , Baldoví Herme G. , Giménez-Marqués Mónica
Published: January 2024

Assembly of different Metal-Organic Frameworks (MOFs) into hybrid MOF-on-MOF heterostructures has been established as a promising approach to develop unique synergistic performances for a variety of applications. Here we report the synthesis of MOF-on-MOF heterostructures by the epitaxial growth of MIL-88B(Fe) onto UiO-66(Zr)-NH2 nanoparticles. The face-selective design and appropriate energy band structure alignment of the selected MOF constituents have permitted its application as active heterogeneous photocatalyst for solar-driven water splitting. The composite achieves apparent quantum yields for photocatalytic overall water splitting at 400 and 450 of about 0.9 %, values that compare much favourably with previous analogous reports. Understanding of this high activity has been gained by spectroscopic and electrochemical characterization together with STEM-EDX and HRTEM-EDX measurements. This study exemplifies the possibility of developing MOF-on-MOF heterostructures with outstanding activity towards photocatalytic water splitting under solar light.
Mechanism of Z-Selective Allylic Functionalization via Thianthrenium Salts
Authors: Targos Karina , Gogoi Achyut , Renteria-Gomez Ángel , Kim Min Ji , Gutierrez Osvaldo , Wickens Zachary
Published: January 2024

A detailed mechanistic study of the Z-selective allylic functionalization via thianthrenium salts is presented. We have leveraged kinetic analysis and deuterium labeling to concretely determine each of the elementary steps involved and used computational methods to establish a high-resolution mechanistic model to rationalize the observed reactivity and selectivity. We find that the reaction proceeds via a rate- and stereodetermining allylic deprotonation of an alkenylthianthrenium species. The Z-configuration of the resultant allylic ylide is translated into the final Z-allylic amine product through a sequence of subsequent fast and irreversible steps: protonation to form a Z-allylic thianthrenium electrophile followed by regioselective substitution by the nucleophile. In the stereodetermining deprotonation step, computational studies have identified a series of stabilizing non-bonding interactions in the Z-alkene forming transition state that con-tribute to the observed stereoselectivity.
Virtual Shake Robot: Simulating Dynamics of Precariously Balanced Rocks for Overturning and Large-displacement Processes
Authors: Chen Zhiang , Arrowsmith Ramón , Das Jnaneshwar , Wittich Christine , Madugo Chris , Kottke Albert
Published: January 2024

Understanding the dynamics of precariously balanced rocks (PBRs) is important for seismic hazard analysis and rockfall prediction. Utilizing a physics engine and robotic tools, we develop a virtual shake robot (VSR) to simulate the dynamics of PBRs during overturning and large-displacement processes. We present the background of physics engines and technical details of the VSR, including software architecture, mechanical structure, control system, and implementation procedures. Validation experiments show the median fragility contour from VSR simulation is within the 95% prediction intervals from previous physical experiments, when PGV/PGA is greater than 0.08 s. Using a physical mini shake robot, we validate the qualitative consistency of fragility anisotropy between the VSR and physical experiments. By overturning cuboids on flat terrain, the VSR reveals the relationship between fragility and geometric dimensions (e.g., aspect and scaling ratios). The ground motion orientation and lateral pedestal support affect PBR fragility. Large-displacement experiments estimate rock trajectories for different ground motions, which is useful for understanding the fate of toppled PBRs. Ground motions positively correlate with large displacement statistics such as mean trajectory length, mean largest velocity, and mean terminal distance. The overturning and large displacement processes of PBRs provide complementary methods of ground motion estimation.
Preschool Teachers’ Role and Beliefs about Developmentally Appropriate Practice: A Systematic Literature Review
Authors: Shumetu Taye Misahun , Yadesa Kana Fituma , Regassa Jekil Tesema
Published: January 2024

This systematic literature review has examined the various functions assumed by preschool educators in promoting developmentally appropriate practice, the differing beliefs held by preschool teachers concerning it, and the factors that influence the beliefs and perceptions of preschool teachers about it. To carry out this review, a comprehensive search strategy was employed across different databases to identify relevant studies published between 2010 and 2023. The inclusion criteria comprised studies that focused on the role and beliefs of preschool teachers in promoting developmentally appropriate practice. The review includes a total of 14 studies. The results indicate that preschool teachers play different roles in promoting developmentally appropriate practice, such as creating a safe and supportive learning environment, providing diverse learning experiences customised to the specific needs and interests of each child, working in collaboration with families to ensure that children receive the necessary support at home, and advocating for the needs of young children and their families. The beliefs of preschool teachers regarding developmentally appropriate practice are attributed to various factors, including their personal experiences as learners, their training and professional development, the culture of the preschool or school where they work, and the availability of resources and support to implement developmentally appropriate practice. The findings highlight the importance of preschool teachers having a strong comprehension of developmentally appropriate practice and being able to implement it effectively in their classrooms. Moreover, it is crucial to provide preschool teachers with professional development opportunities that can enhance their beliefs about developmentally appropriate practice and help them learn how to implement it effectively.
APLIKACE 3D TISKU VE STAVBĚ KOLEJOVÝCH VOZIDEL
Authors:   VTS pri Žilinskej univerzite v Žiline, Brodský Jaroslav
Published: January 2024

Výroba kolejových vozidel se řadí mezi odvětví s vyšší technologickou náročností. Evropská Unie klade velký důraz jak na maximální bezpečnost a provozní efektivnost v rámci železničního sytému, tak i samotných kolejových vozidel v dané životnosti vozidla, která je 40 let. Ke splnění těchto požadavků je třeba při vývoji jednotlivých typů kolejových vozidel (lokomotiv, jednotek, tramvají, metra, vozů a dalších) navrhovat komponenty tak, aby jejich výroba nebyla časově ani finančně náročná a současně vedla ke snižování dopadu na životní prostředí.
EXPERIMENTÁLNÍ VÝZKUM MATERIÁLŮ KOL A KOLEJNIC NA STENDU VDP UNIVERZITY PARDUBICE
Authors:   VTS pri Žilinskej univerzite v Žiline, Culek Bohumil , Schmidová Eva , Malinský Jiří , Culek Bohumil Jr. , Pulda Jan
Published: January 2024

S vývojem nových konstrukcí kolejových vozidel a jejich provozem je spojena i otázka materiálů kol a kolejnic. Neustále se řeší životnosti obou kontaktních ploch ve styku kolo-kolejnice a to jak z pohledu kontaktní únavy, tak i opotřebení. Protože to je oblast, která bezprostředně souvisí z bezpečností provozu, věnuje se ji mimořádná pozornost v teoretické i experimentální rovině. Na Dopravní fakultě Jana Pernera, Univerzity Pardubice bylo ve spolupráci s VÚKV a.s. vyvinuto, postaveno a postupně zdokonalováno laboratorní zařízení na principu Van der Poolova modelu (VDP), na kterém je možné realizovat experimentální výzkum a zkušební činnosti spojené s vývojem a ověřováním materiálů kol a kolejnic. V příspěvku je podána informace o laboratorním zařízení VDP a experimentech, které se na něm realizují.
VZÁJEMNÝ VZTAH DVOJKOLÍ – KOLEJ V OBLOUCÍCH VELMI MALÉHO POLOMĚRU
Authors:   VTS pri Žilinskej univerzite v Žiline, Hába Aleš , Jarolín Zdeněk
Published: January 2024

Tramvajový provoz je na rozdíl od železnice typický mimo jiné i oblouky velmi malých poloměrů (18÷20 m), které se vyskytují zejména na tramvajových křižovatkách v centrech měst, v obratištích (smyčkách) a vozovnách. Zatímco oblouky velmi malých poloměrů na tramvajových křižovatkách jsou často z principu realizovány kolejí s mělkými žlábky, v obratištích se mimo výhybky využívají výhradně žlábky hluboké. Velikost poloměru oblouku významně ovlivňuje postavení dvojkolí v koleji a spolu s rozvorem podvozku či pojezdu pak určuje úhel náběhu. V extrémním případě pak může nastat i situace, kdy vozidlo s velkým rozvorem podvozku či pojezdu není schopné bezpečného průjezdu v oblouku velmi malého poloměru. Taková situace se však netýká tramvají běžně provozovaných za účelem zajištění základní dopravní obslužnosti. Tyto tramvaje mají totiž výhradně podvozky s krátkým rozvorem (do 1900 mm). Problém však může nastat v případě bočně neopotřebených kolejnic s úzkým žlábkem v kombinaci s historickými dvounápravovými tramvajemi, které jsou, ať už pravidelně či příležitostně, provozovány za účelem atrakce. Tyto typy tramvají se totiž vyznačují jediným dvounápravovým pojezdem o velkém rozvoru (až 3600 mm). Situaci pak může ještě zhoršovat i velký poloměr kol. Výše uvedené skutečnosti byly analyzovány v rámci tramvajového provozu Dopravního podniku města Brna, a.s. (DPMB) pro dva vybrané typy žlábkových kolejnic a 4 typy tramvají (1 typ historické dvounápravové tramvaje a 3 typy běžně provozovaných tramvají).
ROZŠÍŘENÍ PORTFOLIA ZKOUŠEK VE ZKUŠEBNÍ LABORATOŘI VUZ
Authors:   VTS pri Žilinskej univerzite v Žiline, Hejzlar Lukáš , Košťál Martin
Published: January 2024

Začátkem roku 2022 rozšířila Zkušební laboratoř Výzkumného ústavu železničního portfolio svých akreditovaných zkoušek, a to v oblasti měření dveřních systémů, teplot, vnějšího osvětlení, srozumitelnosti vlakového rozhlasu a dynamického útlumu tratě.
VÝVOJ DUÁLNÍCH LOKOMOTIV CZ LOKO
Authors:   VTS pri Žilinskej univerzite v Žiline, Kopal Jan , Benický Michal
Published: January 2024

CZ LOKO jako tradiční výrobce motorových lokomotiv musí reagovat na aktuální situaci na trzích, kde dochází k odklonu od čistě dieselových řešení, a proto zařazuje do portfolia lokomotivy duální. Jedná se o velký krok v historii společnosti, neboť tímto se CZ LOKO zařazuje mezi výrobce lokomotiv elektrických. Prvním zástupcem duálních lokomotiv se stává řada 190 s obchodním označením DualShunter 2000 DC. Přestože koncepce duální lokomotivy řady 190 vychází z lokomotivy řady 744, nejedná se o motorovou lokomotivu se sběračem, ale o elektrickou lokomotivu se spalovacím motorem. Tato drobná nuance ovšem kompletně mění technické vnímání lokomotivy jako celku a staví před výrobce mnohá úskalí, která doposud nebylo nutno řešit.
ATO – AUTOMATICKÁ JAZDA VLAKU
Authors:   VTS pri Žilinskej univerzite v Žiline, Kozynets Ivan , Jakubík Peter
Published: January 2024

V súčasnosti čelíme mnohým výzvam a problémom v oblasti koľajových vozidiel, ktoré majú významný dopad na našu spoločnosť a dopravný systém. Jedným z najdôležitejších problémov je staré a zastarané vybavenie koľajových vozidiel. Mnohé vlaky a iné druhy koľajových vozidiel majú dlhú prevádzkovú dobu a nedostatok investícií do ich modernizácie viedol k vzniku viacerých problémov. Ďalším problémom je nedostatočná kapacita koľajových vozidiel. S rastúcim počtom cestujúcich sa stretávame s preplnenými vlakmi a nedostatočným počtom vozidiel na uspokojenie dopytu. Ďalším zásadným problémom je bezpečnosť koľajových vozidiel. Aj napriek významnému pokroku v oblasti bezpečnosti, sa stále vyskytujú nehody a incidenty, ktoré môžu mať vážne následky. Problémom súčasných koľajových vozidiel je aj nedostatočná interoperabilita. V rámci Európy a iných častí sveta existuje mnoho rozdielnych koľajových systémov a štandardov, čo obmedzuje prepojenie a efektívne využívanie koľajovej dopravy. Zároveň je dôležité spomenúť aj nedostatočné investície do výskumu a vývoja v oblasti koľajových vozidiel. Inovácie a nové technológie môžu priniesť významné zlepšenia v efektívnosti, bezpečnosti a udržateľnosti týchto vozidiel. Automatická jazda vlaku (ATO), je technologický systém navrhnutý na riadenie a ovládanie vlakov bez potreby prítomnosti vodiča v kabíne. Táto technológia využíva rôzne senzory, ako sú kamery, radar a GPS, spolu s pokročilými algoritmami a softvérom, aby umožnila vlakom bezpečne sa pohybovať po tratiach a dodržiavať jazdné plány. Je dôležité poznamenať, že implementácia automatickej jazdy vlaku si vyžaduje dôkladné plánovanie, testovanie a zabezpečenie. Bezpečnosť je kľúčovým aspektom a preto sú vytvorené prísne normy a predpisy, ktoré musia byť splnené. V súčasnosti je automatická jazda vlaku čoraz viac skúmaná a implementovaná vo viacerých krajinách po celom svete. Niektoré systémy ATO už fungujú úspešne na vybraných trasách a prinášajú významné výhody v oblasti bezpečnosti, kapacity a efektívnosti dopravy.
Batérie druhej životnosti a systém správy batérií
Authors:   University of Žilina, Šuňal Martin , Kopčan Jaroslav , Benka Denis , Kulhánek Tomáš , Jandík Jan
Published: January 2024

As electromobility continues to advance, there is a growing production of batteries that will eventually require recycling. One potential recycling approach involves repurposing worn yet still operational batteries in energy storage systems, providing them with a renewed functionality. Every battery assembly mandates a Battery Management System (BMS) to ensure proper and secure functionality. In the case of recycled cells, the BMS system becomes more intricate due to notable disparities in wear and, consequently, in parameters among the cells. Hence, active balancing of each cell within the assembly becomes imperative in such a setup. Furthermore, enhanced safety precautions are essential for such assemblies. The entire system must be scalable and adaptable to different numbers and configurations of battery cells from electric vehicles of various manufacturers.
Menič pre batériové úložisko využívajúce druhý život batérií
Authors:   University of Žilina, Turza Stanislav , Liška Martin , Lipták Ondrej , Valenta Pavel , Zich Jan
Published: January 2024

The global trend of electrification in automotive industry cause increasing the number of the batteries for the electric vehicles. The batteries that have reached the end of their primary life in electrical vehicle have a residual capacity. This residual capacity can be used in second-life batteries application. The energy storage system is on of this application. This article is focused on design and verification of the DC/DC converter prototype for this application. In the paper the prototype of interleaved three phase converter with power range up to 30 kW is describe.
V/F based speed controller of induction motor using ann controller - A review
Authors: Vinay Kumar Jain , Roshni Shrimali
Published: January 2024

Induction motors are typical motors with a constant speed that do not function at synchronous rates. Industrial mechanical loads must not only be powered but also operated at the specified velocity. Consequently, it is necessary to have ways of controlling the speed of induction motors. Multiple techniques exist for regulating the velocity of an induction motor. The objective of this paper is to critically examine the existing literature on different speed control techniques and evaluate their effectiveness in the presence of harmonics. Specifically, the focus will be on the utilization of SPWM inverter, harmonics reduction, and speed-torque characteristics to identify the most efficient methods. Additionally, the paper aims to explore strategies for minimizing odd harmonics through the use of an inverter.
A review on the closed-loop strategy for speed control of BLDC motors
Authors: Vinay Kumar Jain , Papiha Bharti
Published: January 2024

The advancements in the field of materials and force gadgets, coupled with the increased affordability of highperformance processors, have led to a widespread adoption of Brushless Direct Current (BLDC) motors across various industries. These applications range from household appliances to automotive, aerospace, and medical sectors. The widespread use of may be attributed to its manifold advantages over various types of engines, such as its superior efficiency, robust power output, extended operational lifespan, relatively quiet operation, and broader range of achievable speeds. Due to the increasing adoption of Brushless Direct Current (BLDC) motors in many real-life applications as a replacement for traditional motors, this paper aims to compile and evaluate a comprehensive list of control algorithms employed for BLDC motor control. This study discusses several ways for managing speed and current, including hysteresis band control, variable DC-link voltage control, and Pulse Width Modulation (PWM) control schemes. The optimization of Proportional-Integral-Derivative (PID) gains for these controlling techniques is achieved through the utilization of the particle swarm optimization (PSO) algorithm. By employing Fast Fourier Transform (FFT) analysis to examine the controller behavior through frequency analysis of the output signals and calculating the Total Harmonic Distortion (THD), a more advantageous control method may be determined.
Implementation of HOG based feature extraction method
Authors: Thilagavathy J. , Surya L.
Published: January 2024

Human detection on emerging intelligent transportation systems is a challenging task in hardware implementation. The Histogram of Oriented Gradients (HOG)-based human detection is the most successful algorithm due to its superior performance. Unfortunately, more intensive computations and poor performance at a multi-scale and low-contrast make human detection more difficult and unreliable. To address the aforementioned problems, an efficient histogram of edge-oriented gradients-based human detection is proposed to preserve the edge gradients at low-contrast and support multi-scale detection. The proposed algorithm uses approximation methods and adopts a pipelined structure that utilizes low-cost and high-speed, respectively. Experiments conducted on various challenging human datasets show that the proposed method provides efficient detection. This algorithm has been synthesized on Xilinx Spartan 3 FPGA software and board, achieving better hardware utilization compared to other state-of-the-art approaches.
KLASIFIKASI STATUS STUNTING BALITA MENGGUNAKAN ALGORITMA FUZZY C-MEANS (STUDI KASUS POSYANDU RW 01 KELURAHAN JEPARA SURABAYA)
Authors: Damayanti Dyta Kresna Devi , Jakfar Muhammad
Published: January 2024

Indonesia merupakan salah satu negara yang memiliki jumlah penduduk cukup banyak tersebar di seluruh pulau di indonesia.Salah satu kota besar yang ada di Indonesia yakni Kota Surabaya memiliki jumlah penduduk cukup banyak yakni mencapai 2.997.547 jiwa ditahun 2023. Banyaknya jumlah penduduk di suatu kota itu disebabkan oleh banyaknya angka kelahiran disetiap tahunnya. Banyaknya penduduk di Surabaya mengakibatkan adanya beberapa permasalahan yang ada yakni salah satu penyebabnya dengan angka kelahiran yang cukup tinggi, itu juga berakibat dengan cukup tingginya jumlah balita di Surabaya. Dengan banyaknya jumlah balita di Surabaya, Salah satu permasalahan tumbuh kembang balita yang sedang dialami di Surabaya yaitu banyaknya jumlah anak balita yang sedang mengalami stunting. Tujuan penelitian ini dilakukan adalah untuk mengetahui status stunting dan mengetahui nilai akurasi metode Fuzzy C-Means dalam Mengklusterisasi status stunting pada balita Posyandu RW 01 Kelurahan Jepara Surabaya.Metode yang digunakan pada penelitian ini adalah pengamatan langsung dan wawancara di Posyandu Mangga  Kelurahan Jepara, Mengenai sistematis kegiatan Balita Posyandu dalam pengumpulan data terkait Usia,Berat Badan,dan Tinggi Badan Badan balita yang dilakukan oleh Kader Posyandu dan selanjutnya akan diolah menggunakan Algoritma Fuzzy C-Means. Pada akhir penelitian yang telah dilakukan menggunakan sistem Pengklasifikasian Fuzzy C-Means pada balita stunting ini maka dapat ditarik sebuah hasil dan kesimpulan penelitian :1.)terdapat 6 balita masuk kedalam cluster Severely stunted, 56 balita masuk kedalam cluster Stunted , 72 balita masuk kedalam cluster normal.2.)Dengan adanya kesamaan 67 data dari hasil  klusterisasi menggunakain nilai Z-Score dengan algoritma Fuzzy C-Means maka didapatkan nilai akurasinya sebesar 50%
Dynamics of Prey-Predator Interaction with Type II Holling Response Function, Additional Food, and Anti-Predator Behavior
Authors: Aufaniyah Nafa Lingga , Abadi Abadi
Published: January 2024

This study discusses the interaction model of prey-predator in the presence of additional food and the ability of anti-predator behavior on prey using the type II Holling response function. This research is carried out starting from the study of the literature, contructing models, determining equilibrium points, analyzing equilibrium points, numerical simulation, and drawing conclusion. From the results of the model analysis, four equilibrium points were obtained, namely the extinction of the two unstable populations, the extinction of predators, and two points with the existence of both stable populations with conditions. Based on the results of the analysis carried out, there is a change in the system solution from the limit point which is the boundary point  and , then it is continued to the right to produce two point solutions, namely, point  is stable to the Hopf bifurcation point when A = 0.239884 and  is unstable until A = 0.147059. after the hopf bifurcation there is a change in stability to become unstable which coincides with a stable limit cycle. The simulation results show that additional food affects the stability of prey and predators even though there is anti-predator behavior on prey.
PERBANDINGAN METODE SAW DAN FSAW PADA URUTAN PRIORITAS PEMELIHARAAN JALAN PROVINSI JAWA TIMUR DI KABUPATEN SIDOARJO
Authors: Patricia Angelika , Yunianti Dwi Nur
Published: January 2024

Infrastruktur jalan yang merupakan salah satu aset utama dalam transportasi yang paling sering digunakan oleh masyarakat umum untuk mendukung kegiatan ekonomi, pendidikan, dan lain-lain. Dalam penelitian ini, akan dilakukan perbandingan metode SAW dan FSAW untuk menentukan urutan ruas jalan berdasarkan nilai preferensinya. Untuk memperoleh informasi yang dibutuhkan proses pengambilan keputusan dalam menentukan jalan mana yang harus segera diperbaiki berdasarkan tingkat kepentingan kriteria yaitu; nilai kondisi jalan, lalu lintas harian dan panjang ruas jalan. Hasil penelitian ini menunjukkan bahwa berdasarkan hasil pembobotan kriteria didapatkan bahwa kriteria kondisi jalan rusak berat mempunyai bobot kepentingan yang paling besar kemudian kriteria lalu lintas harian rata-rata hal ini menunjukkan bahwa persepsi ahli bidang jalan Dinas Pekerjaan Umum Bina Marga Provinsi Jawa Timur dalam pemilihan kepentingan kriteria juga mementingkan aspek dampak kepadatan lalu lintas pada ruas jalan terhadap wilayah. Dari hasil akurasi yangdiperoleh, dapat disimpulkan perbandingan kedua metode yaitu metode SAW dengan skala likert diperoleh nilai persentase sebesar 33% dan FSAW diperoleh nilai persentase sebesar 50%. Metode FSAW disimpulkan lebih baik dibandingkan dengan metode SAW dalam menyelesaikan pengurutan prioritas pemeliharaan jalan.
KAJIAN DASAR RUANG METRIK P-ADIC
Authors: Dahoklory Novita , Patty Henry Willyam Michel
Published: January 2024

Diberikan himpunan semua bilangan rasional Q. Pada penelitian ini akan dijelaskan metrik p-adic untuk suatu bilangan prima p yang dikonstruksikan menggunakan nilai mutlak p-adic pada himpunan Q. Dalam penelitian ini juga akan ditunjukkan bahwa (Q,dp) merupakan ruang metrik khusus yaitu ruang metrik non-Archimedean. Selanjutnya, akan diberikan beberapa sifat (Q,dp) dengan menggunakan beberapa barisan khusus dalam Q. Lebih lanjut, dengan menggunakan sifat-sifat barisan tersebut, akan ditunjukkan bahwa (Q,dp) bukan merupakan ruang metrik lengkap.
STRATEGI KONTROL OPTIMAL PADA SISTEM DINAMIK PEROKOK
Authors: Asmianto Asmianto , Pusawidjayanti Kridha , Kusumasari Vita
Published: January 2024

This study aimed to investigate optimal strategies in dynamic models of smoking. The smoking dynamic model is divided into 3 subpopulations including potential smokers (non-smokers), active smokers who smoke daily, and people who have quit smoking permanently. There are five variables of the smoking dynamic model control strategy, including education related to the dangers of smoking for health, vaccination, tobacco taxation, treatment, and rehabilitation. In solving optimization problems, this study uses the Maximum Pontryagin Principle method. Furthermore, the 4th-order runge kutta method was used to implement numerical solutions and Matlab Software to simulate a control model of smoking dynamics. Based on the simulation results, it can be seen that the control provided is effective in reducing the number of smokers and increasing the number of people who quit smoking.
SUBALJABAR FUZZY DAN IDEAL FUZZY BCK/BCI-ALJABAR DENGAN DERAJAT PADA INTERVAL (0,1]
Authors: Afurqon Ayatulloh , Sulaiman Raden
Published: January 2024

BCK/BCI-aljabar dan himpunan fuzzy adalah dua disiplin matematika yang berbeda, sehingga menjadi suatu topik unik ketika kedua konsep tersebut digabungkan. Fokus utama dari pembahasan penelitian ini adalah subaljabar fuzzy BCK/BCI-aljabar $P$ dengan derajat pada interval $(0, 1]$ didefinisikan dengan, "Misal $X$ dan $P$ adalah BCK/BCI-aljabar, dengan $P \subseteq X$. Himpunan fuzzy $\tilde{A}$ disebut sebagai subaljabar fuzzy pada $P$ dengan derajat $\lambda$, dengan $\lambda \in (0,1]$, jika dan hanya jika $\forall x, y \in P$, $\mu_{\tilde{A}} (x \ast y) \ge \lambda \min\left\{ \mu_{\tilde{A}}(x), \mu_{\tilde{A}}(y) \right\}$. Dan ideal fuzzy BCK/BCI-aljabar $P$ dengan derajat pada interval $(0, 1]$ didefinisikan dengan, "Misal $X$ dan $P$ adalah BCK/BCI-aljabar, dengan $P \subseteq X$. Himpunan fuzzy $\tilde{A}$ disebut ideal fuzzy pada $P$ dengan derajat $(\lambda, \kappa)$, dengan $\lambda \in (0,1]$ dan $\kappa \in (0,1]$ jika dan hanya jika, $\forall x \in P$, $\mu_{\tilde{A}}(0) \ge \lambda \mu_{\tilde{A}}(x)$, dan $\forall x,y \in P$, $\mu_{\tilde{A}}(x) \ge \kappa \min\left\{\mu_{\tilde{A}}(x \ast y), \mu_{\tilde{A}}(y) \right\}$. Selain itu, dibahas sifat-sifat dan pembuktian dari subaljabar fuzzy dan ideal fuzzy BCK/BCI-aljabar dengan derajat pada interval (0,1].
Analisis Faktor Kualitas Pelayanan yang Berpengaruh Terhadap Tingkat Kepuasan Pemustaka
Authors: Setianingsih Erna , Asmianto Asmianto
Published: January 2024

Penelitian mengenai analisis faktor dilakukan untuk mengetahui variabel dan masing-masing indikatornya yang paling berpengaruh terhadap kepuasan pemustaka. Terdapat 5 dimensi variabel kualitas pelayanan yang digunakan yaitu 1) Tangibles , 2) Reliability , 3) Responsiveness , 4) Assurance , dan 5) Emphaty . Data diperoleh dengan membagikan kuesioner yang berisi pernyataan dan diuji dengan perangkat lunak IBM SPSS Statistics 25. Metode penelitian analisis yang digunakan yaitu faktor konfirmatori dimana variabel telah ditentukan sejak awal penyesuaian pada studi literatur.Hasil analisis menunjukkan bahwa variabel yang paling berpengaruh adalah daya tanggap (daya tanggap) yang mampu menjelaskan sebesar 64,642%, urutan selanjutnya yaitu variabel jaminan, empati, izin dan bukti nyata . Indikator dari variabel responsiveness yang paling dominan adalah dengan nilai loading sebesar 0,884. Selanjutnya indikator pada variabel jaminan yang paling berpengaruh adalah dengan nilai loading 0,819. Indikator pada variabel emphaty yang paling berpengaruh adalah dengan loading sebesar 0,861. Pada reliabilitas variabelindikator yang paling berpengaruh adalah dengan nilai loading 0,739 dan indikator pada variabel bukti fisik (tangibles) yang paling berpengaruh adalah dengan nilai loading adalah 0,848.

Kata Kunci: Analisis Faktor, Kepuasan Pemustaka, Kualitas Pelayanan.