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Research on Risk Evolution and Scenario Deduction of Railway Emergencies Based on Knowledge Elements and Dynamic Bayesian Networks
No full textRailway transportation safety is crucial to the national economy and people's livelihood. Conducting risk evolution analysis and scenario deduction for emergencies is a key to preventing and controlling accidents. This paper proposes a method integrating knowledge elements and dynamic Bayesian networks to realize risk evolution analysis and scenario deduction of railway emergencies: firstly, constructing a knowledge element model of railway emergencies to formally express event elements and their associations; secondly, building a dynamic Bayesian network based on this model to depict the dynamic risk transmission process; thirdly, training the network through parameter learning algorithms combined with historical data and expert knowledge; finally, carrying out scenario deduction based on the trained network, analyzing risk evolution trends under multiple scenarios and proposing prevention and control measures. The case verification of the D2809 train derailment accident shows that this method can effectively simulate the risk evolution process of emergencies and provide scientific decision support for railway safety risk management
Study on Impact Effect of Curved Steel-Mixed Composite Beam Bridge Based on Coupling Vibration of Vehicle-Bridge
No full textBased on the detailed study of the domestic and foreign standardized impact coefficient regulations and the collection of a large number of bridge sports car test data, this paper uses the ABAQUS finite element model to establish the axial coupling vibration analysis model. Considering that the upper structure of the curved bridge is affected by the coupling of bending and torsion under the action of the vehicle, the finite element software ANSYS and Dynamics software UM are used to analyze and study the spanning response of the curved bridge under the coupling effect of the axle. In response to the influence of heavy vehicles on steel composite girder Bridges, this paper compares and analyzes the influence of factors such as vehicle speed, vehicle weight and unstable bridge deck on the displacement influence coefficient and bending moment influence coefficient, and compares the difference with the standard calculated influence coefficient. The results show that the influence of vehicle speed on the impact coefficient increases first and then decreases, and the maximum value is reached at 80 km/h. The impact coefficient is greatly affected by road roughness, and increases with the decrease of road grade. The impact coefficient decreases with the increase of vehicle weight. The damping of vehicle (suspension system and tire) has little influence on the impact coefficient, which can be ignored in the study. The relationship between vehicle driving radius and impact coefficient is complicated. The impact coefficient of lateral deflection reaches the maximum value at the center line of the bridge, the impact coefficient of vertical deflection presents positive symmetry, and the impact coefficient of bending moment presents an antisymmetric trend, and the impact coefficient of torque is more sensitive to the vehicle driving radius
Aktualnosti iz projekta “Znanje+Kreativnost = STEM Inspiracija”: Od edukacije do inspiracije: sudjelovanje volonterki HDKI-ja u projektu “Znanje + Kreativnost = STEM Inspiracija”
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Razvojne osovine Urbane aglomeracije Osijek
No full textKao prostor najveće koncentracije ljudi i ljudskih djelatnosti, grad ima ulogu pokretača razvoja šireg prostora. Utjecaj grada na
okolicu najvidljiviji je na prometnim koridorima duž kojih se grad širi u svoju regiju. Ti su dijelovi okolice najdostupniji središnjem
naselju pa te lokacije bivaju poželjne za novu infrastrukturu i daljnji razvoj gradske regije. Potrebno je pronaći održiv model
upravljanja gradskim regijama, koji će u obzir uzeti i sve veću potrebu za očuvanjem i unaprjeđenjem prirodnih i poljoprivrednih
zona. U uvodnom dijelu rada prikazana su dosadašnja istraživanja i primjeri dobre prakse vezani uz koncept razvojnih osovina
(osovina razvoja) te je predstavljen koncept pametne specijalizacije. U svrhu izrade modela osovina razvoja Urbane aglomeracije
Osijek, provedena je analiza prometnih i funkcionalnih obilježja gradske regije. Konačno, izrađen je model u kojem se razvojne
osovine pružaju radijalno iz središta aglomeracije prema regionalnim i subregionalnim središtima osječke regije u pet smjerova
– Baranjska os, Vukovarska os, Vinkovačka os, Đakovačka os i Podravski trokut, pri čemu su svakoj osi definirani razvojni prioriteti
Primjer suradnje učitelja geografije: prirodna i kulturna baština Hrvatske
No full textU članku je prikazan primjer suradnje učitelja geografije iz nekoliko osnovnih škola. Opisani su ciljevi i način provedbe projekta
Prirodna i kulturna baština Hrvatske tijekom tri školske godine
Razvijanje građanske odgovornosti učenika kroz digitalno građanstvo
No full textOvim radom predstavlja se scenarij poučavanja usmjeren na razvijanje digitalnog građanstva i građanske odgovornosti učenika u osnovnoj školi kroz odgojno-obrazovnu djelatnost školskoga knjižničara. Osmišljen je u sklopu mrežnog tečaja Fostering civic engagement in students. Aktivnost Digitalni građani osmišljena je s ciljem poticanja kritičkog promišljaja, medijske pismenosti i odgovornog ponašanja na internetu. Kroz grupni rad, analizu digitalnog sadržaja i kreativne zadatke, učenici prepoznaju lažne vijesti, online manipulacije i neetičko ponašanje, razvijajući pritom komunikacijske, suradničke i vještine rješavanja problema. Aktivnost je prilagođena manjim skupinama učenika i integrira se u međupredmetne teme Građanskog odgoja, Upotrebe IKT-a te nastavu Hrvatskog jezika i Informatike te doprinosi odgojno-obrazovnom radu stručnog suradnika knjižničara
Meljski dijalog kao misaoni eksperiment
No full textThucydides’ rendition of the Melian Dialogue is one of the most famous parts of his History of the Peloponnesian War, and possibly the most famous debate in international relations theory to this day. It has been retold, described, interpreted, analyzed and criticized in a vast number of works on international relations and ethics. The goal of this paper is to present and interpret the Melian Dialogue from a new, so far underexplored perspective, and view it as a thought experiment. In order to achieve this goal, the paper first provides a short discussion of several types and functions of thought experiments in philosophy and elsewhere. Second, the paper presents a short version of the Melian Dialogue. Third, the paper gives an interpretation of the Melian Dialogue as a thought experiment, argues that reading it as a thought experiment is possible, and attempts to pinpoint exactly what kind of thought experiment Thucydides conducted in terms of its function and logical structure.Tukididova verzija Meljskog dijaloga jedan je od najpoznatijih dijelova njegove Povijesti Peloponeškog rata i vjerojatno najpoznatija rasprava u teorijama međunarodnih odnosa do naših dana. Prepričana je, opisana, tumačena, analizirana i kritizirana u velikom broju djela o međunarodnim odnosima i etici. Cilj ovog rada je prikazati i protumačiti Meljski dijalog iz nove, dosad nedovoljno istražene perspektive, promatrajući ga kao misaoni eksperiment. Da bi se postigao ovaj cilj, rad prvo ima kratku raspravu o nekoliko tipova i funkcija misaonih eksperimenata u filozofiji i drugdje. Drugo, rad daje kratak prikaz Meljskog dijaloga. Treće, u radu se interpretira Meljski dijalog kao misaoni eksperiment, tvrdi da se ga je moguće čitati kao misaoni eksperiment i pokušava se odrediti kakav je misaoni eksperiment Tukidid proveo u smislu njegove funkcije i logičke strukture