1,243 research outputs found

    Some observations on the behaviour of plankton in waters discharged by the lakes [Translation from: Ost.bot.Zeit 103(1), 98-109, 1955]

    Get PDF
    This information is based on the limnological observations of the very interesting and remarkable discharge of the Lunzer Obersee, (1117m). On journeying towards the Mittersee, the Lunzer Obersee discharge takes on all the characteristics of spring-water; it was found to be of interest to take note of the change of the composition of the water on those stretches of the course where it flows shows the ground. For this purpose it was necessary to take temperature-recordings, chemical examination of the water and a quantitative determination of the plankton. Samples were taken in 1954 of zooplankton at different times of the year at the discharge of the lake and analysed. The significant loss of organisms in the way of discharge is discussed

    Environmental variables affecting small‐scale distributions of five rotifer species in Lancaster Lake, Michigan

    Full text link
    The small‐scale distributions of the rotifers Polyarthra vulgaris, Synchaeta stylata, Conochilus unicornis, Hexarthra mira , and Asplanchna priodonta were investigated in Lancaster Lake, Cheboygan County, Michigan, July 21, 1974. Measurements were taken for 13 depths (at 1‐m intervals) and at 4 times of the day (1:00 AM, 7:00 AM, 1:00 PM, and 7:00 PM). In addition, the abundances of 6 crustacean, 2 planktonic dipteran, and 10 algal species, as well as temperature, light, oxygen, chlorophyll a , alkalinity, pH and free carbon dioxide were measured. Whereas abiotic factors appeared to control large scale occupation of the lake, and excluded most species from the deeper portions of the hypolimnion, small‐scale distributional variation of the rotifers depended upon biotic interactions, particularly with the crustacean zooplankton.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90242/1/3510620404_ftp.pd

    Male reproductive organs of Apis dorsata

    Get PDF
    Based on an examination of a large number of everted copulatory organs of Apis dorsata drones, a new description of the structure is given (fig 1 c), which differs from previous publications. The result is of significance for classification within the genus Apis

    Final Report from the Models for Change Evaluation

    Get PDF
    Note: This evaluation is accompanied by an evaluation of the National Campaign for this initiative as well as introduction to the evaluation effort by MacArthur's President, Julia Stasch, and a response to the evaluation from the program team. Access these related materials here (https://www.macfound.org/press/grantee-publications/evaluation-models-change-initiative).Models for Change is an initiative of The John D. and Catherine T. MacArthur Foundationto accelerate juvenile justice reforms and promote fairer, more effective, and more developmentally appropriate juvenile justice systems throughout the United States. Between 2004 and 2014, the Foundation invested more than $121 million in the initiative, intending to create sustainable and replicable models of systems reform.In June 2013, the Foundation partnered with Mathematica Policy Research and the University of Maryland to design and conduct a retrospective evaluation of Models for Change. The evaluation focused on the core state strategy, the action network strategy, and the national context in which Models for Change played out. This report is a digest and synthesis of several technical reports prepared as part of the evaluation

    Keypoint-based deformation monitoring using a terrestrial laser scanner from a single station: Case study of a bridge pier

    Full text link
    [EN] Terrestrial laser scanners (TLSs) offer a possibility for more automated and efficient deformation monitoring of civil engineering structures with higher spatial resolution than standard methods, as well as without the necessity of permanently installing the monitoring equipment. In such applications, scanners are usually placed so that the lines of sight are roughly aligned with the main directions of the expected deformations, and the deformations are estimated from point cloud differences between multiple epochs. This allows high sensitivity in the direction of the surface normal, but deformations along the surface are often undetected or hard to precisely quantify. In this work, we propose an algorithm based on the detection and matching of keypoints identified within TLS intensity images. This enables precise quantification of deformations along the scanned surfaces. We also present the application of the algorithm for monitoring a bridge pier of the Hochmoselbrücke in Germany, as a case study. Deformations up to about 4 cm due to thermal expansion and bending of the pier were successfully detected from scans taken throughout the day from a single location, up to 180 m from the monitored surfaces. The results agreed within a few millimeters to independent monitoring using state-of-the-art processing of TLS point clouds obtained from a different location and using a different type/brand of instrument. The newly proposed algorithm can either be used to complement existing TLS-based deformation analysis methods by adding sensitivity in certain directions, or it can be valuable as a standalone solution.Medic, T.; Ruttner, P.; Holst, C.; Wieser, A. (2023). Keypoint-based deformation monitoring using a terrestrial laser scanner from a single station: Case study of a bridge pier. En 5th Joint International Symposium on Deformation Monitoring (JISDM 2022). Editorial Universitat Politècnica de València. 167-175. https://doi.org/10.4995/JISDM2022.2022.1381216717

    Delineation of ECG signals using leads transformation

    Get PDF
    Tato práce je věnována rozměření EKG signálu. V první části je teoretický rozbor EKG a různé způsoby zpracování tohoto signálu. Metody umožňující transformaci svodů mezi různými svodovými systémy. Dále jsou rozepsány rozličné metody rozměření signálu. V druhé části je popis metody použité k rozměření EKG signálu z databáze CSE. Konkrétně metoda s použitím dyadické vlnkové transformace. Práce obsahuje, také popis vytvořeného programu a jeho výsledky. Třetí část práce obsahuje popis a realizaci metod transformace svodů a shlukové analýzy. Závěrem této práce je vyhodnocení použité rozměřovací metody.This work deals with delineation of ECG signals. First we will become familiar with ECG and commonly used processing methods. Various transformation methods of ECG leads. Further we will describe methods of delineation ECG signals. Second part is dedicated to metod used in this work for delineation of ECG signals from CSE database. Particulary method using Dyadic Wavelet Transform. Work include, description of used program and results. Third part is dedicated to methods of ECG leads transformations and cluster analysis. In conclusion we will evaluate the results.
    corecore