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See detailFrustration and anger regulation in children with autism spectrum disorder
Pinto Costa, Andreia UL; Steffgen, Georges UL

Poster (2014, July)

Autism Spectrum Disorder (ASD) is characterized by impairments in social interaction, communication and difficulties regulating emotions. Emotion regulation is an important aspect of children’s emotional ... [more ▼]

Autism Spectrum Disorder (ASD) is characterized by impairments in social interaction, communication and difficulties regulating emotions. Emotion regulation is an important aspect of children’s emotional and social development. It maximizes learning and allows the development of trusting relationships. In the present study we aimed at studying how children with ASD regulate frustration and anger. Participants were 17 children diagnosed with ASD aged between 5 and 12 years old (14 boys and 3 girls) and their parents. Emotion regulation was assessed by parents’ reports of their child’s emotion regulation (Emotion Regulation Checklist, Shields & Cicchetti, 1998) and through the observation of children during the episode “Attractive toy placed behind a barrier”. The purpose of this episode was to elicit frustration and anger by placing a toy, with which the child had been playing, behind a barrier. Anger was coded as verbal and physical action against the barrier or persons present. Results revealed that children with more autistic symptoms were evaluated by their parents as having more difficulties regulating their emotions. Furthermore, parents’ evaluations of their child’s emotion regulation were positively correlated to the expression of anger during the frustration and anger regulation episode. However, no significant differences were observed in terms of autistic symptoms during the frustration and anger regulation episode. In conclusion, results show that children with more autistic symptoms are seen by their parents as having more difficulties regulating their emotions but do not show differences in terms of their emotion regulation during a frustration and anger eliciting episode. [less ▲]

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See detailFrustration between syn- and anticlinicity in mixtures of chiral and non-chiral tilted smectic-c-type liquid crystals
Lagerwall, Jan UL; Heppke, Gerd; Giesselmann, Frank

in European Physical Journal E. Soft Matter (2005), 18(1), 113-121

We study the effects of mixing ferroelectric and antiferroelectric liquid-crystal compounds (FLCs and AFLCs) when the former are strictly synclinic and the latter strictly anticlinic, i.e. one mixture ... [more ▼]

We study the effects of mixing ferroelectric and antiferroelectric liquid-crystal compounds (FLCs and AFLCs) when the former are strictly synclinic and the latter strictly anticlinic, i.e. one mixture component exhibits only SmC* and the other only SmCa* as tilted phase. Three different paths between syn- and anticlinicity were detected: transition directly between SmC* and SmCa*, transition via the SmCβ* and SmCγ* subphases, or by “escaping” the clinicity frustration by reducing the tilt to zero, i.e. the SmA* phase is extended downwards in temperature, separating SmC* from SmCa* in the phase diagram. The most common path is the one via the subphases, demonstrating that these phases appear as a result of frustration between syn- and anticlinic and, consequently, between syn- and antipolar order. For assessing the role of chirality, we also replaced the FLC with non-chiral synclinics. With one of the AFLCs, the route via supbhases was detected even in this case, suggesting that chirality —although necessary— does not have quite the importance that has previously been attributed to the appearance of the subphases. The path chosen in the mixture study seemed to be determined mainly by the synclinic component, the subphase induction occurring only when the SmA*-SmC* transition was second order. [less ▲]

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See detailFrustration inducing tasks as tools for assessing adolescent emotion regulation
Battistutta, Layla UL; Steffgen, Georges UL

Scientific Conference (2018, November)

Adolescents can be at risk for the development of mental health symptoms which can be exacerbated by emotion regulation problems. Hence, empirically validated tools to assess emotion regulation among ... [more ▼]

Adolescents can be at risk for the development of mental health symptoms which can be exacerbated by emotion regulation problems. Hence, empirically validated tools to assess emotion regulation among adolescents in experimental settings are needed, but so far potential differences between already existing frustration inducing tasks are not well understood. The aim of the present study was thus to compare the efficacy of two non-verbal distress tolerance tasks – the Behavioural Indicator of Resiliency to Distress (BIRD, Lejuez et al.), and the Mirror Tracing Persistence Task (MPTP; Strong et al., 2003), in inducing frustration in a sample of 72 adolescents between the ages of 11 and 16. Adolescents’ subjective, physiological and behavioural emotion responses were assessed via self-report (PANAS-C; Laurent et al., 1999), heart rate monitoring and persistence on the task respectively, and associated with their self-reported emotion regulation difficulties (DERS-SF, Gullone & Taffe, 2012) as well as strategy use during the task (ERQ-state; Egloff et al., 2006). Both tasks were found to be subjectively frustrating, as evidenced by significant differences between pre- and post- reported negative affect. Beyond the similar self-reported psychological distress for both tasks, stronger negative physiological and behavioural reactions were however found for the BIRD task with higher heart rates as well as a tendency towards a shorter persistence on this task. The emotional responses were found to be correlated with adolescents reported difficulties, above all with their reported impulsiveness. Adolescents’ strategy use of reappraisal and suppression did not differ between tasks. Due to the similar self-reported negative affect after both tasks, these findings validate the use of both tasks in an adolescent population. In addition, they highlight potential differences between tasks in terms of emotion responses. These discrepancies should be taken into account in further studies due to their implications for the interpretation of findings. [less ▲]

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See detailFSquaDRA: Fast Detection of Repackaged Applications
Zhauniarovich, Yury; Gadyatskaya, Olga UL; Crispo, Bruno et al

in Data and Applications Security and Privacy XXVIII (2014, July)

The ease of Android applications repackaging and proliferation of application clones in Google Play and other markets call for new effective techniques to detect repackaged code and combat distribution of ... [more ▼]

The ease of Android applications repackaging and proliferation of application clones in Google Play and other markets call for new effective techniques to detect repackaged code and combat distribution of cloned applications. Today all existing techniques for repackaging detection are based on code similarity or feature (e.g., permission set) similarity evaluation. We propose a new approach to detect repackaging based on the resource files available in application packages. Our tool called FSquaDRA performs a quick pairwise application comparison (full pairwise comparison for 55,000 applications in just 80 hours on a laptop), as it measures how many identical resources are present inside both packages under analysis. The intuition behind our approach is that malicious repackaged applications still need to maintain the “look and feel” of the originals by including the same images and other resource files, even though they might have additional code included or some of the original code removed. To evaluate the reliability of our approach we perform a comparison of the FSquaDRA similarity scores with the code-based similarity scores of AndroGuard for a dataset of randomly selected application pairs, and our results demonstrate strong positive correlation of the FSquaDRA resource-based score with the code-based similarity score. [less ▲]

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See detailFuel Cell System Diagnosis based on a Causal Structural Model
Rosich, Albert UL; Nejjari, Fatiha; Sarrate, Ramon

in Fault Detection, Supervision and Safety of Technical Processes (2009)

In this work, a diagnosis system is developed and applied to a fuel cell stack system. The paper shows the significance of structural models to solve diagnosis issues in large scale systems. The diagnosis ... [more ▼]

In this work, a diagnosis system is developed and applied to a fuel cell stack system. The paper shows the significance of structural models to solve diagnosis issues in large scale systems. The diagnosis system based on residual generation by means of the computation of causal MSO sets (Minimal Structural Overdetermined) is capable of detecting and isolating faults in the fuel cell system. [less ▲]

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See detailFuesent am brasilianesche Minett
Santana, Dominique UL

Speeches/Talks (2018)

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See detailFührt Ängstlichkeit und Ärgerneigung bei Leistungssportlern zu erhöhter Stressanfälligkeit?
Steffgen, Georges UL; Schwenkmezger, Peter

in Psychologie und Sport (1995), 2(1), 14-20

Abhängig von dem Ausmaß der personenspezifischen Streßanfälligkeit sind in emotional belastenden Situationen unterschiedliche Reaktionsweisen mit häufig negativen Folgen auf die sportliche Leistung ... [more ▼]

Abhängig von dem Ausmaß der personenspezifischen Streßanfälligkeit sind in emotional belastenden Situationen unterschiedliche Reaktionsweisen mit häufig negativen Folgen auf die sportliche Leistung feststellbar. Die vorliegende Studie an luxemburgischen Leistungssportlerinnen und -sportlern zeigt auf, inwieweit Ängstlichkeit, Ärgerneigung sowie Formen des Ärgerausdrucks und der Streßverarbeitung als Prädiktoren der Streßanfälligkeit von Bedeutung sind. Insbesondere der Befund, daß bei hoher Ärgerneigung ein geringer aktiver Kontrollversuch die Streßanfälligkeit erhöht, wird hinsichtlich seiner Bedeutung für den Leistungssport diskutiert. [less ▲]

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See detailFührt die EU-Bilanzrichtlinie zu inkonsistenten und unsystematischen Rechnungslegungsnormen? Eine kritische Würdigung am Beispiel von Aufwandsrückstellungen
Muessig, Anke UL

in ACE Comptabilité, fiscalité, audit, droit des affaires au Luxembourg (2016)

The European accounting directive does not specify the users of financial statements, nor weights the single objectives of financial accounting. Thus deducting EU accounting standards consistently and ... [more ▼]

The European accounting directive does not specify the users of financial statements, nor weights the single objectives of financial accounting. Thus deducting EU accounting standards consistently and systematically from predefined objectives is nearly impossible. As an example, accounting for ‘provisions for future charges’ can be justified neither by financial statements’ informational and stewardship function nor by the objective of measuring distributable profits for tax dividend payment purposes, or by capital maintenance requirements. Accounting for ‘provisions for future charges’ simply allows preparers of financial statements to shift ex post profit distribution decisions to ex ante profit determination, for a specific ‘apparent’ purpose i.e. the maintenance of assets or repairs thereof. Accordingly the ‘true and fair’ profit actually realized by the entity is not disclosed to external users. Thus accounting for ‘provisions for future charges’ is in contradiction with the informational and stewardship function of the annual accounts, as well as with the determination of a fair measurement of distributable profits. More specifically, shareholders find themselves deprived of part of the profits actually realized by the entity and dispose of fewer financial resources to cover for their own expenses. Besides, by shifting the profit distribution decisions to the level of profit determination, a circular reference is introduced in the question of determining the distributable profit, residing in the fact that in the function of the distributable profit is included a variable that needs to be determined by the financial statements, i.e. the variable ‘profit to be distributed’. The usefulness of the balance sheet as a basis for the profit determination is taken ad absurdum, if management’s profit distribution decisions are already reflected at the level of profit determination. In this case, determination of distributable profit is based on the question of how much profit the entity’s governing body intend to distribute and not based on the ‘true and fair’ profit actually realized. Accounting for ‘provision for future charges’ is neither the expression of protection of creditors. In substance, accounting for provisions is required by the prudence principle but this is only true for provisions accounted for future expected losses (future charges not compensated by future revenues). Provisions for charges cover expenses not linked to ‘expected’ future losses. Thus, provisions for charges reflect compensated future charges. Accordingly accounting for ‘provisions for future charges’ distorts the financial position and performance of an entity, misinterprets the prudence principle and violates the accrual principle of accounting. [less ▲]

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See detailFührt eine negative Erfahrung mit der Polizei zwangsläufig zu einer negativen Bewertung der Polizei? Die Rolle von Assimilations- und Kontrasteffekten bei "part-whole question sequences"
Heinz, Andreas UL; Steffgen, Georges UL

in Monatsschrift für Kriminologie und Strafrechtsreform (2015), 98(4), 320-334

Method research has shown that responses to an item can depend on the question order. This applies especially to part-whole question sequences: If a specific item is asked before a general item, the ... [more ▼]

Method research has shown that responses to an item can depend on the question order. This applies especially to part-whole question sequences: If a specific item is asked before a general item, the respondents might react in two different ways. They might include their validation of the specific item into the assessment of the general item (assimilation effect) or they might ignore them (contrast effect). Although many questionnaires contain part-whole question sequences, these effects are rarely discussed or even investigated in applied research. The article outlines the theoretical background of question order effects in general with a particular regard to part-whole question sequences. Furthermore, a split ballot experiment verifies the impact of question order effects on the general assessment of the police. [less ▲]

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See detailFULL 3D RECONSTRUCTION OF DYNAMIC NON-RIGID SCENES: ACQUISITION AND ENHANCEMENT
Afzal, Hassan UL

Doctoral thesis (2016)

Recent advances in commodity depth or 3D sensing technologies have enabled us to move closer to the goal of accurately sensing and modeling the 3D representations of complex dynamic scenes. Indeed, in ... [more ▼]

Recent advances in commodity depth or 3D sensing technologies have enabled us to move closer to the goal of accurately sensing and modeling the 3D representations of complex dynamic scenes. Indeed, in domains such as virtual reality, security, surveillance and e-health, there is now a greater demand for aff ordable and flexible vision systems which are capable of acquiring high quality 3D reconstructions. Available commodity RGB-D cameras, though easily accessible, have limited fi eld-of-view, and acquire noisy and low-resolution measurements which restricts their direct usage in building such vision systems. This thesis targets these limitations and builds approaches around commodity 3D sensing technologies to acquire noise-free and feature preserving full 3D reconstructions of dynamic scenes containing, static or moving, rigid or non-rigid objects. A mono-view system based on a single RGB-D camera is incapable of acquiring full 360 degrees 3D reconstruction of a dynamic scene instantaneously. For this purpose, a multi-view system composed of several RGB-D cameras covering the whole scene is used. In the first part of this thesis, the domain of correctly aligning the information acquired from RGB-D cameras in a multi-view system to provide full and textured 3D reconstructions of dynamic scenes, instantaneously, is explored. This is achieved by solving the extrinsic calibration problem. This thesis proposes an extrinsic calibration framework which uses the 2D photometric and 3D geometric information, acquired with RGB-D cameras, according to their relative (in)accuracies, a ffected by the presence of noise, in a single weighted bi-objective optimization. An iterative scheme is also proposed, which estimates the parameters of noise model aff ecting both 2D and 3D measurements, and solves the extrinsic calibration problem simultaneously. Results show improvement in calibration accuracy as compared to state-of-art methods. In the second part of this thesis, the domain of enhancement of noisy and low-resolution 3D data acquired with commodity RGB-D cameras in both mono-view and multi-view systems is explored. This thesis extends the state-of-art in mono-view template-free recursive 3D data enhancement which targets dynamic scenes containing rigid-objects, and thus requires tracking only the global motions of those objects for view-dependent surface representation and fi ltering. This thesis proposes to target dynamic scenes containing non-rigid objects which introduces the complex requirements of tracking relatively large local motions and maintaining data organization for view-dependent surface representation. The proposed method is shown to be e ffective in handling non-rigid objects of changing topologies. Building upon the previous work, this thesis overcomes the requirement of data organization by proposing an approach based on view-independent surface representation. View-independence decreases the complexity of the proposed algorithm and allows it the flexibility to process and enhance noisy data, acquired with multiple cameras in a multi-view system, simultaneously. Moreover, qualitative and quantitative experimental analysis shows this method to be more accurate in removing noise to produce enhanced 3D reconstructions of non-rigid objects. Although, extending this method to a multi-view system would allow for obtaining instantaneous enhanced full 360 degrees 3D reconstructions of non-rigid objects, it still lacks the ability to explicitly handle low-resolution data. Therefore, this thesis proposes a novel recursive dynamic multi-frame 3D super-resolution algorithm together with a novel 3D bilateral total variation regularization to filter out the noise, recover details and enhance the resolution of data acquired from commodity cameras in a multi-view system. Results show that this method is able to build accurate, smooth and feature preserving full 360 degrees 3D reconstructions of the dynamic scenes containing non-rigid objects. [less ▲]

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See detailFull 3D Reconstruction of Non-Rigidly Deforming Objects
Afzal, Hassan; Aouada, Djamila UL; Mirbach, Bruno et al

in ACM Transactions on Multimedia Computing, Communications, & Applications (2018)

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See detailFull counting statistics of Majorana interferometers
Strubi, Gregory; Belzig, Wolfgang; Schmidt, Thomas UL et al

in Physica E (2015), 74

We study the full counting statistics of interferometers for chiral Majorana fermions with two incoming and two outgoing Dirac fermion channels. In the absence of interactions, the FCS can be obtained ... [more ▼]

We study the full counting statistics of interferometers for chiral Majorana fermions with two incoming and two outgoing Dirac fermion channels. In the absence of interactions, the FCS can be obtained from the 4×4 scattering matrix S that relates the outgoing Dirac fermions to the incoming Dirac fermions. After presenting explicit expressions for the higher-order current correlations for a modified Hanbury Brown–Twiss interferometer, we note that the cumulant-generating function can be interpreted such that unit-charge transfer processes correspond to two independent half-charge transfer processes, or alternatively, to two independent electron-hole conversion processes. By a combination of analytical and numerical approaches, we verify that this factorization property holds for a general SO(4) scattering matrix, i.e. for a general interferometer geometry. [less ▲]

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See detailFull counting statistics of spin transfer through the Kondo dot
Schmidt, Thomas UL; Gogolin, A. O.; Komnik, A.

in Phys. Rev. B (2007), 75

We calculate the spin current distribution function for a Kondo dot in two different regimes. In the exactly solvable Toulouse limit the linear response, zero temperature statistics of the spin transfer ... [more ▼]

We calculate the spin current distribution function for a Kondo dot in two different regimes. In the exactly solvable Toulouse limit the linear response, zero temperature statistics of the spin transfer is trinomial, such that all the odd moments vanish and the even moments follow a binomial distribution. On the contrary, the corresponding spin-resolved distribution turns out to be binomial. The combined spin and charge statistics is also determined. In particular, we find that in the case of a finite magnetic field or an asymmetric junction the spin and charge measurements become statistically dependent. Furthermore, we analyzed the spin counting statistics of a generic Kondo dot at and around the strong coupling fixed point (the unitary limit). Comparing these results with the Toulouse limit calculation we determine which features of the latter are generic and which ones are artifacts of the spin symmetry breaking. [less ▲]

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See detailFull counting statistics of spin transfer through ultrasmall quantum dots
Schmidt, Thomas UL; Komnik, A.; Gogolin, A. O.

in Phys. Rev. B (2007), 76

We analyze the spin-resolved full counting statistics of electron transfer through an ultrasmall quantum dot coupled to metallic electrodes. Modeling the setup by the Anderson Hamiltonian, we explicitly ... [more ▼]

We analyze the spin-resolved full counting statistics of electron transfer through an ultrasmall quantum dot coupled to metallic electrodes. Modeling the setup by the Anderson Hamiltonian, we explicitly take into account the on-site Coulomb repulsion U. We calculate the cumulant generating function for the probability to transfer a certain number of electrons with a preselected spin orientation during a fixed time interval. With the cumulant generating function at hand, we are then able to calculate the spin current correlations, which are of utmost importance in the emerging field of spintronics. We confirm the existing results for the charge statistics and report the discovery of a different type of correlation between the spin-up and -down polarized electron flows, which has the potential to become a powerful instrument for the investigation of the Kondo effect in nanostructures. [less ▲]

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See detailFull Diversity Detection in MIMO Systems with a Fixed-Complexity Sphere Decoder
Jaldén, Joakim; Barbero, Luis G.; Ottersten, Björn UL et al

in Proceedings IEEE International Conference on Acoustics, Speech, and Signal Processing (2007)

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See detailFull frequency reuse multibeam satcoms: frame based precoding and user scheduling
Christopoulos, Dimitrios; Chatzinotas, Symeon UL; Ottersten, Björn UL

in Submitted to IEEE Transactions on Wireless Communications, available (2014)

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See detailFull scale BWR containment loca response test at the INKA test facility
Wagner, T.; Leyer, Stephan UL

in International Conference on Nuclear Engineering, Proceedings, ICONE (2015), 2015-January

KERENA is an innovative boiling water reactor concept with passive safety systems (Generation III+) of AREVA. The reactor is an evolutionary design of operating BWRs (Generation II). In order to verify ... [more ▼]

KERENA is an innovative boiling water reactor concept with passive safety systems (Generation III+) of AREVA. The reactor is an evolutionary design of operating BWRs (Generation II). In order to verify the functionality and performance of the KERENA safety concept required for the transient and accident management, the test facility "Integral Teststand Karlstein" (INKA) was built at Karlstein (Germany). It is a mock-up of the KERENA boiling water reactor containment, with integrated pressure suppression system. The complete chain of passive safety components is available. The passive components and the levels are represented in full scale. The volume scaling of the containment compartments is approximately 1:24. The reactor pressure vessel (RPV) is simulated via the steam accumulator of the Karlstein Large Valve Test Facility. This vessel provides an energy storage capacity of approximately 1/6 of the KERENA RPV and is supplied by a Benson boiler with a thermal power of 22 MW. With respect to the available power supply, the containment- and system-sizing of the facility is by far the largest one of its kind worldwide. From 2009 to 2012, several single component tests were conducted (Emergency Condenser, Containment Cooling Condenser, Core Flooding System etc.). On March 21st, 2013, the worldwide first large-scale only passively managed integral accident test of a boiling water reactor was simulated at INKA. The integral test measured the combined response of the KERENA passive safety systems to the postulated initiating event was the "Main Steam Line Break" (MSLB) inside the Containment with decay heat simulation. The results of the performed integral test (MSLB) showed that the passive safety systems alone are capable to bring the plant to stable conditions meeting all required safety targets with sufficient margins. Therefore the test verified the function of those components and the interplay between them as response to an anticipated accident scenario. The test provided evidence that the INKA is worldwide the first large scale test facility to perform integral verification tests of passive safety concepts under plant-like scaling and thermodynamic conditions. Hence, the test facility also shows that it is capable to perform containment response tests for existing Generation II BWRs (with active safety systems) and advanced (passive) reactor designs besides KERENA. These test results can be used to strengthen existing containment codes with regard to heat transfer, natural circulation, gas- and temperature stratification and others. Copyright © 2015 by JSME. [less ▲]

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See detailFull scale quasi steady state component tests of the SWR 1000 emergency condenser at the INKA test facility
Leyer, Stephan UL; Maisberger, F.; Schaub, B. et al

in International Congress on Advances in Nuclear Power Plants 2009, ICAPP 2009 (2009), 2

[No abstract available]

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See detailFull scale steady state component tests of the SWR 1000 fuel pool cooler at the INKA test facility
Leyer, Stephan UL; Maisberger, F.; Schaub, B. et al

in International Congress on Advances in Nuclear Power Plants 2009, ICAPP 2009 (2009), 2

The SWR 1000 fuel pool coolers are tubular heat exchangers. They are installed on the fuel pool wall around the spent fuel storage racks. Fuel pool water is cooled by means of natural convection. Forced ... [more ▼]

The SWR 1000 fuel pool coolers are tubular heat exchangers. They are installed on the fuel pool wall around the spent fuel storage racks. Fuel pool water is cooled by means of natural convection. Forced circulation flow of closed-cooling water exists on the tube side of each heat exchanger. The penetrations of the cooling water supply lines through the fuel pool liner are all located above the pool water surface. This ensures that the fuel pool cannot lose water in the event of a pipe break. Integration of the cooling components inside the fuel pool ensures only noncontaminated piping within the reactor building. The fuel pool cooling system consists of two redundant cooling trains. Each cooling train comprises four heat exchangers connected in parallel. The system must ensure adequate heat removal both during normal plant operation and in the event of any postulated accident. To verify proper functioning of the component, full-scale, steadystate tests were performed at the INKA (Integral Teststand Karlstein) test facility in Karlstein Germany. The characteristic diagram for heat transfer capacity of the component as a function of cooling water temperature and fuel pool water temperature obtained from these experiments will be presented in this paper. [less ▲]

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