Search results for "Stage"
showing 10 items of 1393 documents
Simple flume with a central baffle
2016
Abstract In this paper the stage-discharge relationship of a flume with a central baffle is theoretically deduced using the Buckingham-Theorem of the dimensional analysis and the self-similarity theory. The new stage-discharge equation is calibrated by the measurements carried out by Peruginelli and Bonacci using a baffle having a given throat length and five different values of the contraction ratio. Finally, for a given throat length, a relationship linking the discharge with the upstream water depth, the contraction ratio and the contracted width is deduced.
New Stage–Discharge Relationship for Triangular Broad-Crested Weirs
2022
Simple hydraulic structures, such as weirs, allow measuring flow discharge by using the upstream flow depth and a stage–discharge relationship. In this relationship, a discharge coefficient is introduced to correct all the effects neglected in the derivation (viscosity, surface tension, velocity head in the approach channel, flow turbulence, non-uniform velocity profile, and streamline curvature due to weir contraction). In this paper, the dimensional analysis and the incomplete self-similarity theory are used to investigate the outflow process of triangular broad-crested weirs, characterized by different values of the ratio between crest height p and channel width B, and to theoretic…
SingleChannelNet : A model for automatic sleep stage classification with raw single-channel EEG
2022
In diagnosing sleep disorders, sleep stage classification is a very essential yet time-consuming process. Various existing state-of-the-art approaches rely on hand-crafted features and multi-modality polysomnography (PSG) data, where prior knowledge is compulsory and high computation cost can be expected. Besides, it is a big challenge to handle the task with raw single-channel electroencephalogram (EEG). To overcome these shortcomings, this paper proposes an end-to-end framework with a deep neural network, namely SingleChannelNet, for automatic sleep stage classification based on raw single-channel EEG. The proposed model utilizes a 90s epoch as the textual input and employs two multi-conv…
Alleviating Class Imbalance Problem in Automatic Sleep Stage Classification
2022
For real-world automatic sleep-stage classification tasks, various existing deep learning-based models are biased toward the majority with a high proportion. Because of the unique sleep structure, most of the current polysomnography (PSG) datasets suffer an inherent class imbalance problem (CIP), in which the number of each sleep stage is severely unequal. In this study, we first define the class imbalance factor (CIF) to describe the level of CIP quantitatively. Afterward, we propose two balancing methods to alleviate this problem from the dataset quantity and the relationship between the class distribution and the applied model, respectively. The first one is to employ the data augmentati…
Initial-Stage Suicide Bereavement Experiences: A Case Study.
2022
This study aimed to shed light on the initial-stage bereavement experiences of an individual bereaved by suicide, at three months from the loss of his spouse to suicide. A semi-structured in-depth interview was conducted with the individual, a man in his thirties. The data were analyzed using qualitative assimilation analysis, based on the Assimilation Model and the Assimilation of Problematic Experiences Scale (APES). The APES ratings of the interview revealed that the individual’s bereavement was associated with the earlier stages of APES (all scoring under 3.5). In addition, the swift and frequent fluctuations in the APES ratings gave indications that the bereavement was unstable and co…
O zagrożeniu wypaleniem zawodowym nauczycieli wczesnej edukacji
2018
Nauczyciele stanowią jedną z tych grup zawodowych, które poddane są szczególnej kontroli społecznej, co ma związek z charakterem wykonywanej pracy. Odpowiedzialność za kształcenie i wychowanie przyszłych pokoleń, chęć sprostania oczekiwaniom rodziców a także wymaganiom stawianym przez nadzór pedagogiczny stwarza sytuację, w której osoby mniej odporne na stres narażone są ha różne konsekwencje. Od osób wykonujących zawód nauczyciela zawsze wymagano wiele. Poza niezbędnymi kompetencjami merytorycznymi, metodycznymi, psychologicznymi czy społecznymi, oczekiwano mądrości życiowej, odpowiedzialności, autentyczności, zaangażowania, poświęcenia, altruizmu, kreatywności i wielu innych cech sprzyjaj…
Bailiaspis (Trilobita) with English affinities from the Mansilla Formation (Cambrian Series 3 of the Iberian Chains; NE Spain)
2020
A new study of the trilobite record in the Mansilla Formation (Iberian Chains, NE Spain) has led to the discovery of the presence of Bailiaspis aff. tuberculata, B. cf. tuberculata and Bailiaspis sp., the first certain citation of this genus in the Mediterranean subprovince. The age of the findings extends from Eccaparadoxides asturianus Zone (upper Leonian) to the lowermost Badulesia tenera Zone (lower Caesaraugustan), which correspond to the upper part of Stage 5 of Cambrian Series 3 and, probably, the lowermost Drumian. The specimens show the cranidial anterior border expanding backwards, forming a plectrum that is characteristic of Bailiaspis. The main characters of the three taxa inclu…
Teachers’ Identity Tensions and Related Coping Strategies : Interaction With the Career Stages and Socio-Political Context
2022
When external requirements conflict with teachers’ personal beliefs and values, the resulting internal struggles can lead to identity tensions. Contributing to discussion on teachers’ identity development in a challenging context, this study investigated teacher identity tensions and related coping strategies in Hong Kong. We conducted 21 semi-structured interviews with qualified teachers and then performed a deductive thematic analysis of the data. We categorised the identity tensions as positioned on the micro or macro level, and distinguished the coping strategies as emotion-focused or problem-focused behaviours. The identity tensions and related coping strategies seemed to be associated…
Saskarsme ar mājdzīvniekiem kā 1,5 - 3 gadus vecu bērnu sociālo prasmju veicinātāja pirmsskolas iestādē
2021
Diplomdarba tēma ir “Saskarsme ar mājdzīvniekiem kā 1,5 - 3 gadus vecu bērnu sociālo prasmju veicinātāja pirmsskolas iestādē”. Diplomdarba mērķis ir pētīt 1,5 - 3 gadus vecu bērnu sociālo prasmju veicināšanas iespējas pirmsskolas izglītības iestādē saskarsmē ar mājdzīvniekiem. Diplomdarba teorētiskajā daļā pētīta un analizēta teorētiskā literatūra par socializāciju un sociālo prasmju attīstību, kā arī literatūra par saskarsmi ar mājdzīvniekiem ģimenē un bērna dzīvē. Diplomdarba praktiskajā daļā veikta intervija ar kanisterapeiti un veiktas aptaujas pirmsskolas programmas 1. posma pedagogiem, kā arī 1,5 līdz 3 gadus vecu bērnu vecākiem. Balstoties uz intervijā grūto informāciju un aptauju re…
Thermal anomalies detection in a photovoltaic plant using artificial intelligence: Italy case studies
2021
This paper proposes the application of artificial intelligence techniques for the identification of thermal anomalies that occur in a photovoltaic system due to malfunctions or faults, with the aim to limit the energy production losses by detecting faults at an early stage. The proposed approach is based on a Thermographic Non-Destructive Test conducted with Unmanned Aerial Vehicles equipped with a thermal imaging camera, which allows the detection of abnormal operating conditions without interrupting the normal operation of the PV system rapidly and cost-effectively. The thermographic images and videos are automatically inspected using a Convolutional Neural Network, developed by an open-s…