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First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

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Journal of Palaeogeography 2020年第1期9卷 71-87页

作者： Matthias Alberti Franz T.Fürsich Nils Andersen Institut für Geowissenschaften Christian-Albrechts-Universitat zu KielLudewig-Meyn-Straβe 1024118 KielGermany GeoZentrum Nordbayern Fachgruppe PalaoUmweltFriedrich-Alexander-Universitat Erlangen-NürnbergLoewenichstraβe 2891054 ErlangenGermany Leibniz Laboratory for Radiometric Dating and Stable Isotope Research Christian-Albrechts-Universitat zu KielMax-Eyth-Straβe 1124118 KielGermany

The stable isotope(δ13 C,δ18 O)composition of a collection of Lower Jurassic brachiopods and oysters from the Andean Basin of northern Chile was *** results allow the first reconstruction of absolute water temperatures for several ammonite zones in the Lower Jurassic of South *** temperature record starts with comparatively high values in the Late Sinemurian(average:27.0℃;Raricostatum Zone).Just before the Sinemurian–Pliensbachian transition,temperatures dropped to an average of 24.3℃.The lowest temperature value in the dataset was recorded for a brachiopod shell of the latest Pliensbachian Spinatum Zone(19.6℃).No data are available for the Early Toarcian,but results for the late Toarcian show again comparatively warm conditions(average:24.4℃;Thouarsense–Levesquei zones).Even though more material and analyses are necessary to corroborate the recorded temperatures,the present dataset seems to indicate the global nature of the Late Pliensbachian Cooling *** contrast,the global warming during the Toarcian Oceanic Anoxic Event has not been recorded due to a lack of Early Toarcian ***δ13 C record of brachiopods and oysters documents a gradual increase in values representing background *** shells were used for high-resolution stable isotope analyses and show seasonal temperature fluctuations over a period of around 3 years in the life time of the *** explained only by temperatures,theδ18 O values point to a minimum estimate for the seasonality in the late Toarcian of slightly more than 3℃.

关键词： Early Jurassic Chile Stable isotopes Palaeoclimate water temperatures Seasonality

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Convolutional Neural Network-Based Identity Recognition Using ECG atDifferent water temperatures During Bathing

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Computers, Materials & Continua 2022年第4期71卷 1807-1819页

作者： Jianbo Xu Wenxi Chen Biomedical Information Engineering Laboratory Graduate School of Computer Science and EngineeringUniversity of AizuAizu-Wakamatsu965-8580Japan

This study proposes a convolutional neural network(CNN)-based identity recognition scheme using electrocardiogram(ECG)at different water temperatures(WTs)during bathing,aiming to explore the impact of ECG length on the recognition *** data was collected using non-contact electrodes at five different WTs during *** young student subjects(seven men and three women)participated in data *** ECG recordings were collected at each preset bathtub WT for each *** recording is 18 min long,with a sampling rate of 200 *** total,150 ECG recordings and 150 WT recordings were *** R peaks were detected based on the processed ECG(baseline wandering eliminated,50-Hz hum removed,ECG smoothing and ECG normalization)and the QRS complex waves were *** segmented waves were then transformed into binary images,which served as the *** each subject,the training,validation,and test data were taken from the first,second,and third ECG recordings,*** number of training and validation images was 84297 and 83734,*** the test stage,the preliminary classification results were obtained using the trained CNN model,and the finer classification results were determined using the majority vote method based on the preliminary *** validation rate was 98.71%.The recognition rates were 95.00%and 98.00%when the number of test heartbeats was 7 and 17,respectively,for each subject.

关键词： Electrocardiogram QRS recognition rate water temperatures convolutional neural network majority vote

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