Relating sediment supply to the morphological and hydro-meteorological characteristics of torrent catchments

2021 ◽  
Author(s):  
Maxime Morel ◽  
Guillaume Piton ◽  
Caroline Le Bouteiller ◽  
Alexandre Mas ◽  
Guillaume Evin
Keyword(s):  
Sediment Yield ◽  
Prediction Method ◽  
Original Data ◽  
Sediment Supply ◽  
Set Covering ◽  
Sediment Retention ◽  
Multivariate Statistical ◽  
Catchment Basin ◽  
Mountain Areas ◽  
Data Set

<p>In mountain areas, the quantification of sediment yield is essential in the diagnosis of a torrential watershed. The objective of this study is to present a prediction method based on multivariate statistical models calibrated from an original data set covering nearly 130 torrential basins in the Northern French Alps. Data on sediment yield and occurrence of torrential events were collected on these catchments thanks to registries from sediment retention basins (average monitoring period of 20 years) and historical archives of the catchment basin managers. On these catchments, several morphological and hydro-meteorological characteristics were calculated (e.g. geological and sediment connectivity indices, the rate of connected eroding areas in the catchment, the Melton index, the slope of the fan, etc.) in order to relate them to sediment production and the frequency of occurrence of torrential events. These models allow the estimation of quantiles of the sediment yield in small torrent catchments. These models could be useful to evaluate sediment yield and the occurrence of torrential events on catchment not equipped with sedimentation structures.</p>

Faith and experience

2016 ◽  
Vol 24 (4) ◽  
pp. 370-381 ◽  
Author(s):  
Luis Felipe Mantilla
Keyword(s):  
Latin America ◽  
Political Parties ◽  
Original Data ◽  
Set Covering ◽  
Data Set ◽  
Transitions To Democracy ◽  
History Of ◽  
Authoritarian Politics ◽  
Electoral Performance ◽  
Positive Effect

How does a history of participation in secular authoritarian regimes shape the trajectory of religious political parties after transitions to democracy? This article examines the contrasting experiences of Catholic political parties in Latin America in order to assess whether and under what conditions pre-transition participation has a positive effect on post-transition electoral performance. It develops a theoretical account that emphasizes the relative costs and benefits of participation in secular authoritarian politics for religious parties. Empirically, it uses an original data set covering 22 Catholic parties that participated in 104 elections across Latin America as well as in-depth case studies of Mexico and Peru. It finds that Catholic parties that participated in authoritarian politics were more likely to emerge as significant players after transition, but that this effect is contingent on the competitiveness of the authoritarian regime.

scholarly journals Prediction Method of Gestational Diabetes Based on Electronic Medical Record Data

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yang Liu ◽  
Zhaoxiang Yu ◽  
Hua Sun
Keyword(s):  
Logistic Regression ◽  
Gestational Diabetes ◽  
Medical Record ◽  
Electronic Medical Record ◽  
Prediction Method ◽  
Original Data ◽  
Medical Record Data ◽  
Data Set ◽  
Electronic Medical Record Data ◽  
Record Data

At present, the secondary application of electronic medical records is focused on auxiliary medical diagnosis to improve the accuracy of clinical diagnosis. The main research in this article is the prediction method of gestational diabetes based on electronic medical record data. In the original data, the ID number of the medical examiner did not match the medical examination record. In order to ensure the accuracy of the data, this part of the record was removed. First, the preparation stage before building the model is to determine the baseline accuracy of the original data, test the effectiveness of the machine learning algorithm, and then balance the target data set to solve the bias caused by the imbalance between data classes and the illusion of excessive model prediction results. Then, the disease prediction model is constructed by dividing the data set, selecting parameters and algorithms, and visualizing the model. Finally, the effect of predictive model construction is comprehensively judged based on multiple evaluation indicators and control experimental models. In this paper, the RF model can be used to rank the importance of the feature importance of the output feature on the importance of the classification result of the input feature. In order to test the accuracy of regression prediction, the experiment uses absolute mean error and root mean square error to evaluate the accuracy of fasting blood glucose prediction. A logistic regression model is constructed through the training set, and the test set data are brought into the prediction model for prediction. Experimental data show that when the features filtered by WBFS are used, the accuracy, F1 value, and AUC value of logistic regression are 0.809, 0.881, and 0.825, respectively, which is an increase of about 12% compared with when the feature is not used. The results show that the electronic medical record data drive can effectively improve the accuracy of predicting gestational diabetes.

scholarly journals Party crashers? Modeling genuinely new party development paths in Western Europe

2020 ◽  
pp. 135406882091135
Author(s):  
Vincenzo Emanuele ◽  
Allan Sikk
Keyword(s):  
Western Europe ◽  
Original Data ◽  
Set Covering ◽  
Latent Growth ◽  
Data Set ◽  
New Parties ◽  
Party Development ◽  
Short And Long Term ◽  
Development Paths

Western Europe has recently experienced the emergence of successful new parties, but while single parties or countries have been extensively studied, insufficient attention has been devoted to this phenomenon from a comparative and long-term perspective. By relying on an original data set covering 20 countries and 344 parliamentary elections, this article presents the first analysis of West European ‘genuinely new parties’ (GNPs) across time, countries and party families. We hypothesize that the parties differ not only in terms of their short- and long-term success but have a range of distinct development paths. Through a latent growth model, we provide a classification of GNPs in terms of their breakthrough and initial performance. According to the specific trajectory followed by new parties in the first five elections they contest, the model suggests five different classes of new parties in Western Europe: ‘explosive’, ‘meteoric’, ‘contender’, ‘flat’ and ‘flop’. The article discusses the implications of these findings also regarding the ability of the model to produce estimates and predictions about the future electoral performances of GNPs.

scholarly journals The Generational and Institutional Sources of the Global Decline in Voter Turnout

2021 ◽  
pp. 1-39 ◽  
Author(s):  
Filip Kostelka ◽  
André Blais
Keyword(s):  
Voter Turnout ◽  
Original Data ◽  
Set Covering ◽  
Generational Change ◽  
National Elections ◽  
Data Set ◽  
Individual Level ◽  
Level Data ◽  
Group Mobilization ◽  
Election Studies

ABSTRACT Why has voter turnout declined in democracies all over the world? This article draws on findings from microlevel studies and theorizes two explanations: generational change and a rise in the number of elective institutions. The empirical section tests these hypotheses along with other explanations proposed in the literature—shifts in party/candidate competition, voting-age reform, weakening group mobilization, income inequality, and economic globalization. The authors conduct two analyses. The first analysis employs an original data set covering all post-1945 democratic national elections. The second studies individual-level data from the Comparative Study of Electoral Systems and British, Canadian, and US national election studies. The results strongly support the generational change and elective institutions hypotheses, which account for most of the decline in voter turnout. These findings have important implications for a better understanding of the current transformations of representative democracy and the challenges it faces.

Rotational Characteristics of the Green Solar Corona: 1947-1991

1994 ◽  
Vol 144 ◽  
pp. 139-141 ◽  
Author(s):  
J. Rybák ◽  
V. Rušin ◽  
M. Rybanský
Keyword(s):  
Solar Corona ◽  
World Wide ◽  
Rotation Period ◽  
Original Data ◽  
Coronal Emission ◽  
Time Intervals ◽  
Data Set ◽  
The World ◽  
Coronal Emission Line ◽  
Homogeneous Data

AbstractFe XIV 530.3 nm coronal emission line observations have been used for the estimation of the green solar corona rotation. A homogeneous data set, created from measurements of the world-wide coronagraphic network, has been examined with a help of correlation analysis to reveal the averaged synodic rotation period as a function of latitude and time over the epoch from 1947 to 1991.The values of the synodic rotation period obtained for this epoch for the whole range of latitudes and a latitude band ±30° are 27.52±0.12 days and 26.95±0.21 days, resp. A differential rotation of green solar corona, with local period maxima around ±60° and minimum of the rotation period at the equator, was confirmed. No clear cyclic variation of the rotation has been found for examinated epoch but some monotonic trends for some time intervals are presented.A detailed investigation of the original data and their correlation functions has shown that an existence of sufficiently reliable tracers is not evident for the whole set of examinated data. This should be taken into account in future more precise estimations of the green corona rotation period.

Molecular Views of Ice-Embedded Lumbricus Terrestris Erythrocruorin Obtained By Invariant Classification

1990 ◽  
Vol 48 (1) ◽  
pp. 450-451
Author(s):  
Michael schatz ◽  
Joachim Jäger ◽  
Marin van Heel
Keyword(s):  
Image Interpretation ◽  
Lumbricus Terrestris ◽  
Reference Image ◽  
Large Set ◽  
Multivariate Statistical ◽  
Data Set ◽  
Low Contrast ◽  
Negative Stain ◽  
Reference Images ◽  
Statistical Resolution

Lumbricus terrestris erythrocruorin is a giant oxygen-transporting macromolecule in the blood of the common earth worm (worm "hemoglobin"). In our current study, we use specimens (kindly provided by Drs W.E. Royer and W.A. Hendrickson) embedded in vitreous ice (1) to avoid artefacts encountered with the negative stain preparation technigue used in previous studies (2-4).Although the molecular structure is well preserved in vitreous ice, the low contrast and high noise level in the micrographs represent a serious problem in image interpretation. Moreover, the molecules can exhibit many different orientations relative to the object plane of the microscope in this type of preparation. Existing techniques of analysis requiring alignment of the molecular views relative to one or more reference images often thus yield unsatisfactory results.We use a new method in which first rotation-, translation- and mirror invariant functions (5) are derived from the large set of input images, which functions are subsequently classified automatically using multivariate statistical techniques (6). The different molecular views in the data set can therewith be found unbiasedly (5). Within each class, all images are aligned relative to that member of the class which contributes least to the classes′ internal variance (6). This reference image is thus the most typical member of the class. Finally the aligned images from each class are averaged resulting in molecular views with enhanced statistical resolution.

Electing the Senate

2017 ◽  
Author(s):  
Wendy J. Schiller ◽  
Charles Stewart III
Keyword(s):  
Original Data ◽  
State Legislators ◽  
Internal Conflict ◽  
Data Set ◽  
Senate Elections ◽  
Political Actors ◽  
The Public ◽  
Seventeenth Amendment ◽  
The People ◽  
Election Process

From 1789 to 1913, U.S. senators were not directly elected by the people—instead the Constitution mandated that they be chosen by state legislators. This radically changed in 1913, when the Seventeenth Amendment to the Constitution was ratified, giving the public a direct vote. This book investigates the electoral connections among constituents, state legislators, political parties, and U.S. senators during the age of indirect elections. The book finds that even though parties controlled the partisan affiliation of the winning candidate for Senate, they had much less control over the universe of candidates who competed for votes in Senate elections and the parties did not always succeed in resolving internal conflict among their rank and file. Party politics, money, and personal ambition dominated the election process, in a system originally designed to insulate the Senate from public pressure. The book uses an original data set of all the roll call votes cast by state legislators for U.S. senators from 1871 to 1913 and all state legislators who served during this time. Newspaper and biographical accounts uncover vivid stories of the political maneuvering, corruption, and partisanship—played out by elite political actors, from elected officials, to party machine bosses, to wealthy business owners—that dominated the indirect Senate elections process. The book raises important questions about the effectiveness of Constitutional reforms, such as the Seventeenth Amendment, that promised to produce a more responsive and accountable government.

Engagement Through the Diaspora Channel

2017 ◽  
Author(s):  
Michael S. Danielson
Keyword(s):  
Civil Society ◽  
Statistical Models ◽  
State Level ◽  
The State ◽  
Multivariate Statistical ◽  
Political Factors ◽  
Data Set ◽  
Level Data ◽  
Municipal Level

The first empirical task is to identify the characteristics of municipalities which US-based migrants have come together to support financially. Using a nationwide, municipal-level data set compiled by the author, the chapter estimates several multivariate statistical models to compare municipalities that did not benefit from the 3x1 Program for Migrants with those that did, and seeks to explain variation in the number and value of 3x1 projects. The analysis shows that migrants are more likely to contribute where migrant civil society has become more deeply institutionalized at the state level and in places with longer histories as migrant-sending places. Furthermore, the results suggest that political factors are at play, as projects have disproportionately benefited states and municipalities where the PAN had a stronger presence, with fewer occurring elsewhere.

scholarly journals An Algorithm for the Removal of Cosmic Ray Artifacts in Spectral Data Sets

2019 ◽  
Vol 73 (8) ◽  
pp. 893-901
Author(s):  
Sinead J. Barton ◽  
Bryan M. Hennelly
Keyword(s):  
Cosmic Ray ◽  
Data Sets ◽  
Biological Cells ◽  
Statistical Classification ◽  
Signal To Noise ◽  
Multivariate Statistical ◽  
Data Set ◽  
Artefact Removal ◽  
Single Capture ◽  
Acquisition Method

Cosmic ray artifacts may be present in all photo-electric readout systems. In spectroscopy, they present as random unidirectional sharp spikes that distort spectra and may have an affect on post-processing, possibly affecting the results of multivariate statistical classification. A number of methods have previously been proposed to remove cosmic ray artifacts from spectra but the goal of removing the artifacts while making no other change to the underlying spectrum is challenging. One of the most successful and commonly applied methods for the removal of comic ray artifacts involves the capture of two sequential spectra that are compared in order to identify spikes. The disadvantage of this approach is that at least two recordings are necessary, which may be problematic for dynamically changing spectra, and which can reduce the signal-to-noise (S/N) ratio when compared with a single recording of equivalent duration due to the inclusion of two instances of read noise. In this paper, a cosmic ray artefact removal algorithm is proposed that works in a similar way to the double acquisition method but requires only a single capture, so long as a data set of similar spectra is available. The method employs normalized covariance in order to identify a similar spectrum in the data set, from which a direct comparison reveals the presence of cosmic ray artifacts, which are then replaced with the corresponding values from the matching spectrum. The advantage of the proposed method over the double acquisition method is investigated in the context of the S/N ratio and is applied to various data sets of Raman spectra recorded from biological cells.

Styles of Representation in Constituencies in the Homeland and Abroad: The Case of Italy

2020 ◽  
Author(s):  
Eva Østergaard-Nielsen ◽  
Stefano Camatarri
Keyword(s):  
Original Data ◽  
Role Orientation ◽  
International Mobility ◽  
Data Set ◽  
Democratic Representation ◽  
Public Debates ◽  
At Home

Abstract The role orientation of political representatives and candidates is a longstanding concern in studies of democratic representation. The growing trend in countries to allow citizens abroad to candidate in homeland elections from afar provides an interesting opportunity for understanding how international mobility and context influences ideas of representation among these emigrant candidates. In public debates, emigrant candidates are often portrayed as delegates of the emigrant constituencies. However, drawing on the paradigmatic case of Italy and an original data set comprising emigrant candidates, we show that the perceptions of styles of representation abroad are more complex. Systemic differences between electoral districts at home and abroad are relevant for explaining why and how candidates develop a trustee or delegate orientation.

Sign in / Sign up

Export Citation Format

Share Document