bluuebunny/crossref_metadata_2025 huggingface dataset:
Sensitivity studies with the regional climate model COSMO-CLM 5.0 over the CORDEX Central Asia Domain
Authors: Russo Emmanuele , Kirchner Ingo , Pfahl Stephan , Schaap Martijn , Cubasch Ulrich
Published: December 2019

Abstract. Due to
its extension, geography and the presence of several underdeveloped or
developing economies, the Central Asia domain of the Coordinated Regional
Climate Downscaling Experiment (CORDEX) is one of the most vulnerable regions
on Earth to the effects of climate changes. Reliable information on potential
future changes with high spatial resolution acquire significant importance
for the development of effective adaptation and mitigation strategies for the
region. In this context, regional climate models (RCMs) play a fundamental
role. In this paper, the results of a set of sensitivity experiments with the
regional climate model COSMO-CLM version 5.0, for the Central Asia CORDEX
domain, are presented. Starting from a reference model setup, general model
performance is evaluated for the present day, testing the effects of singular
changes in the model physical configuration and their mutual interaction with
the simulation of monthly and seasonal values of three variables that are
important for impact studies: near-surface temperature, precipitation and
diurnal temperature range. The final goal of this study is two-fold: having a
general overview of model performance and its uncertainties for the
considered region and determining at the same time an optimal model
configuration. Results show that the model presents remarkable deficiencies over different
areas of the domain. The combined change of the albedo, taking into
consideration the ratio of forest fractions, and the soil conductivity,
taking into account the ratio of liquid water and ice in the soil, allows one
to achieve the best improvements in model performance in terms of
climatological means. Importantly, the model seems to be particularly
sensitive to those parameterizations that deal with soil and surface
features, and that could positively affect the repartition of incoming
radiation. The analyses also show that improvements in model performance are
not achievable for all domain subregions and variables, and they are the
result of a compensation effect in the different cases. The proposed better
performing configuration in terms of mean climate leads to similar positive
improvements when considering different observational data sets and boundary
data employed to force the simulations. On the other hand, due to the large
uncertainties in the variability estimates from observations, the use of
different boundaries and the model internal variability, it has not been
possible to rank the different simulations according to their representation
of the monthly variability. This work is the first ever sensitivity study of an RCM for the CORDEX Central Asia domain and its results are of fundamental importance for further model development and for future climate projections over the area.
FALL3D-8.0: a computational model for atmospheric transport and deposition of particles, aerosols and radionuclides. Part I: model physics and numerics
Authors: Folch Arnau , Mingari Leonardo , Gutierrez Natalia , Hanzich Mauricio , Macedonio Giovanni , Costa Antonio
Published: December 2019

Abstract. This manuscript presents FALL3D-8.0, the last version release of an open-source code with 15+ years of track record and a growing number of users in the volcanological and atmospheric communities. The code has been redesigned and rewritten from scratch in the framework of the EU Center of Excellence for Exascale in Solid Earth (ChEESE) in order to overcome legacy issues and allow for successive optimisations that are already planned in the preparation of the code towards extreme-scale computing. However, this baseline version already contains substantial improvements in terms of model physics, solving algorithms, and code accuracy and performance. The code, originally conceived for atmospheric dispersal and deposition of tephra particles, has been extended to model other types of particles, aerosols and radionuclides. The solving strategy has also been changed, replacing the former central-differences scheme for a high-resolution central-upwind scheme derived from finite volumes, which minimises numerical diffusion even in presence of sharp concentration gradients and discontinuities. The parallelisation strategy, Input/Output (I/O), model pre-process workflows and memory management have also been reconsidered, leading to substantial improvements on code scalability, efficiency, and overall capability to handle much larger problems. This paper details the FALL3D-8.0 model physics and the numerical implementation of the code.
Multi-step ahead daily inflow forecasting using ERA-Interim reanalysis dataset based on gradient boosting regression trees
Authors: Liao Shengli , Liu Zhanwei , Liu Benxi , Cheng Chuntian , Jin Xinfeng , Zhao Zhipeng
Published: December 2019

Abstract. Inflow forecasting plays an essential role in reservoir management and operation. The impacts of climate change and human activities make accurate inflow prediction increasingly difficult, especially for longer lead times. In this study, a new hybrid inflow forecast framework with ERA-Interim reanalysis data as input, adopting gradient boosting regression trees (GBRT) and the maximum information coefficient (MIC) was developed for multi-step ahead daily inflow forecasting. Firstly, the ERA-Interim reanalysis dataset provides enough information for the framework to discover inflow for longer lead times. Secondly, MIC can identify effective feature subset from massive features that significantly affects inflow so that the framework can avoid over-fitting, distinguish key attributes with unimportant ones and provide a concise understanding of inflow. Lastly, the GBRT is a prediction model in the form of an ensemble of decision trees and has a strong ability to capture nonlinear relationships between input and output in long lead times more fully. The Xiaowan hydropower station located in Yunnan Province, China is selected as the study area. Four evaluation criteria, the mean absolute error (MAE), the root mean square error (RMSE), the Nash-Sutcliffe efficiency coefficient (NSE) and the Pearson correlation coefficient (CORR), were used to evaluate the established models using historical daily inflow data (1/1/2017–31/12/2018). Performance of the presented framework was compared to that of artificial neural networks (ANN), support vector regression (SVR) and multiple linear regression (MLR) models. The experimental results indicate that the developed method generally performs better than other models and significantly improves the accuracy of inflow forecasting at lead times of 5–10 days. The reanalysis data also enhances the accuracy of inflow forecasting except for forecasts that are one-day ahead.
Infrasound and seismoacoustic signatures of the 28 September 2018 Sulawesi super-shear earthquake
Authors: Pilger Christoph , Gaebler Peter , Ceranna Lars , Le Pichon Alexis , Vergoz Julien , Perttu Anna , Tailpied Dorianne , Taisne Benoit
Published: December 2019

Abstract. A magnitude 7.5 earthquake occurred on 28 September 2018 at 10:02:43 UTC
near the city of Palu on the Indonesian island of Sulawesi. It was a
shallow, strike-slip earthquake with a rupture extending to a length of about
150 km and reaching the surface. Moreover, this earthquake was identified as
one of very few events having a super-shear rupture speed. Clear and long-lasting infrasound signatures related to this event were
observed by four infrasound arrays of the International Monitoring System of
the Comprehensive Nuclear-Test-Ban Treaty Organization as well as by one
national infrasound station in Singapore. Although these infrasound stations
SING (Singapore), I39PW (Palau), I07AU (Australia), I40PG (Papua New Guinea)
and I30JP (Japan) are located at large distances of between 1800 and 4500 km
from the earthquake's epicentral region, the observed infrasound signals
associated with this event were intense, including both seismic and acoustic
arrivals. A detailed study of the event-related infrasound observations and the
potential infrasound generation mechanisms is presented, covering
range-dependent infrasound transmission loss and propagation modeling and
characterization of the atmospheric background conditions, as well as
identification of the regions of seismoacoustic activity by applying a back-projection method from the infrasound receivers to potential source regions.
This back projection of infrasonic arrivals allows one to estimate that the main
infrasound source region for the Sulawesi earthquake is related to the
extended rupture zone and the nearby topography. This estimation and a
comparison to other super-shear as well as large regional earthquakes
identify no clear connection between the earthquake's super-shear nature
and the strong infrasound emission.
Study on real-time correction of site amplification factor
Authors: Xie Quancai , Ma Qiang , Zhang Jingfa , Yu Haiying
Published: December 2019

Abstract. The site amplification factor was usually considered to be
scalar values, such as amplification of peak ground acceleration or peak
ground velocity, or increments of seismic intensity in the earthquake early
warning (EEW) system or seismic-intensity repaid report system. This paper focuses
on evaluating an infinite impulse recursive filter method that could produce
frequency-dependent site amplification and compare the performance of the
scalar-value method with the infinite impulse recursive filter method. A
large number of strong motion data of IBRH10 and IBRH19 of the Kiban Kyoshin
network (KiK-net) triggered in more than 1000 earthquakes from 2004
to 2012 were selected carefully and used to obtain the relative site
amplification ratio; we model the relative site amplification factor with a
casual filter. Then we make a simulation from the borehole to the surface and also
simulate from the front-detection station to the far-field station. Compared to
different simulation cases, it can easily be found that this method could
produce different amplification factors for different earthquakes and could
reflect the frequency-dependent nature of site amplification. Through these
simulations between two stations, we can find that the frequency-dependent
correction for site amplification shows better performance than the amplification factor relative to velocity (ARV)
method and station correction method. It also shows better performance than
the average level and the highest level of the Japan Meteorological Agency (JMA)
earthquake early warning system in ground motion prediction. Some cases in which simulation
did not work very well were also found; possible reasons and
problems were analyzed and addressed. This method pays attention to the
amplitude and ignores the phase characteristics; this problem may be improved
by the seismic-interferometry method. Frequency-dependent correction for
site amplification in the time domain highly improves the accuracy of
predicting ground motion in real time.
Non-stationary extreme value analysis applied to seismic fragility assessment for nuclear safety analysis
Authors: Rohmer Jeremy , Gehl Pierre , Marcilhac-Fradin Marine , Guigueno Yves , Rahni Nadia , Clément Julien
Published: December 2019

Abstract. Fragility curves (FC) are key tools for seismic probabilistic safety assessments that are performed at the level of the nuclear power plant (NPP). These statistical methods relate the probabilistic seismic hazard loading at the given site and the required performance of the NPP safety functions. In the present study, we investigate how the tools of non-stationary extreme value analysis can be used to model in a flexible manner the tail behaviour of the engineering demand parameter as a function of the considered intensity measure. We focus the analysis on the dynamic response of an anchored steam line and of a supporting structure under seismic solicitations. The failure criterion is linked to the exceedance of the maximum equivalent stress at a given location of the steam line. A series of three-component ground-motion records (~ 300) were applied at the base of the model to perform non-linear time history analyses. The set of numerical results was then used to derive a FC, which relates the failure probability to the variation of peak ground acceleration (PGA). The probabilistic model of the FC is selected via information criteria completed by diagnostics on the residuals, which support the choice of the generalized extreme value GEV distribution (instead of the widely used log-normal model). The GEV distribution is here non-stationary and the relationships of the GEV parameters (location, scale and shape) are established with respect to PGA using smooth non-linear models. The procedure is data-driven, which avoids the introduction of any a priori assumption on the shape/form of these relationships. To account for the uncertainties in the mechanical and geometrical parameters of the structures (elastic stiffness, damping, pipeline thicknesses, etc.), the FC is further constructed by integrating these uncertain parameters. A penalisation procedure is proposed to set to zero the variables of little influence in the smooth non-linear models. This enables us to outline which of these parametric uncertainties have negligible influence on the failure probability as well as the nature of the influence (linear, non-linear, decreasing, increasing, etc.) with respect to each of the GEV parameters.
Generation of Rossby waves off the Cape Verde Peninsula: the role of the coastline
Authors: Sirven Jérôme , Mignot Juliette , Crépon Michel
Published: December 2019

Abstract. In December 2002 and January 2003 satellite observations
of chlorophyll showed a strong coastal signal along the west African coast
between 10 and 22∘ N. In addition,
a wavelike pattern with a wavelength of about 750 km
was observed from 20 December 2002 and was detectable
for 1 month in the open sea, south-west of the Cape Verde Peninsula.
Such a pattern suggests the existence of a locally generated
Rossby wave which slowly propagated westward during this period. This hypothesis
was confirmed by analysing sea surface height provided by satellite altimeter during
this period. To decipher the mechanisms at play, a numerical study
based on a reduced-gravity shallow-water model has first been conducted. A wind burst,
broadly extending over the region where the offshore oceanic signal is observed,
is applied for 5 d. A Kelvin wave quickly develops along the northern edge
of the cape, then propagates and leaves the area in a few days.
Simultaneously, a Rossby wave whose characteristics seem similar
to the observed pattern forms and slowly propagates westward.
The existence of the peninsula limits the extent of the wave
to the north. The spatial extent of the wind burst
determines the extent of the response and correspondingly the timescale
of the phenomenon (about 100 d in the present case). When the wind burst
has a large zonal and small meridional extent, the behaviour
of a wave to the north of the peninsula differs
from that to the south.
These results are corroborated and completed by an analytical study of a linear
reduced-gravity model using a non-Cartesian coordinate system. This system is
introduced to evaluate the potential impact of the coastline shape.
The analytical computations confirm that a period of around 100 d
can be associated with the observed wave considering the value of the wavelength;
they also show that the role of the coastline remains moderate at such timescales.
By contrast, when the period becomes shorter (smaller than 20–30 d),
the behaviour of the waves is modified because of the shape of the coast.
South of the peninsula, a narrow band of sea isolated from the rest
of the ocean by two critical lines appears. Its meridional extent is about 100 km
and Rossby waves could propagate there towards the coast.
InSAR time series analysis of seasonal surface displacement dynamics on the Tibetan Plateau
Authors: Reinosch Eike , Buckel Johannes , Dong Jie , Gerke Markus , Baade Jussi , Riedel Björn
Published: December 2019

Abstract. Climate change and the associated rise in air temperature have affected the Tibetan Plateau to a significantly stronger degree than the global average over the past decades. This has caused deglaciation, permafrost degradation and increased precipitation, heavily changing the water balance of this region. Surface displacement processes are likely to change as the ground continues to warm up and as such it is vital to understand both seasonal and interannual processes dynamics. The Nam Co area is well suited to studying these processes via Interferometric Synthetic Aperture Radar (InSAR) time series analysis, due to its lack of higher vegetation and relatively thin snow cover. The short revisit time of the Sentinel-1 system further reduces the risk of temporal decorrelation, making it possible to produce surface displacement models with good spatial coverage. We created three different surface displacement models to study freeze-thaw processes, seasonal sliding and linear creep. Most slopes of the area are unstable, with velocities of 8 to 17 mm yr−1, and some landforms reach velocities of up to 18 cm yr−1. The monsoonal climate accelerates those movements during the summer months through high temperatures and heavy rainfall. The fastest moving landforms, some of which have been identified as rock glaciers, do not follow this seasonal pattern of accelerated velocity in summer, instead they follow a linear sliding pattern. It is unclear if this linearity is connected to the ice content in those landforms. Flat regions at Nam Co are mostly stable on a multiannual scale but some experience subsidence, which could be caused by permafrost degradation. We observe a very clear seasonal freeze-thaw cycle in the valleys, where thawing and subsequent freezing of the active layer cause a vertical oscillation of the ground of up to a few centimeters, especially near streams and other water bodies.
La carta como elemento de la construcción de una memoria sobre la dictadura en el documental latinoamericano contemporáneo
Authors: Del Valle Dávila Ignacio
Published: December 2019

Este artículo tiene como objetivo estudiar los usos de la carta como estrategia discursiva y elemento narrativo en los films latinoamericanos contemporáneos dirigidos por familiares de militantes políticos y víctimas de los aparatos represivos de las dictaduras del Cono Sur. Con ese fin, se analizan los vínculos que entretejen tanto la enunciación epistolar como la carta, en su dimensión archivística, con el cine en primera persona y los modos performativos del audiovisual. Asimismo, se proponen diferentes modelizaciones de la memoria del pasado autoritario emprendidas por estos films: el paradigma de la resistencia, el de la víctima del terrorismo de Estado y el de la víctima colateral.
Investigando los remedios populares elaborados a partir de especies vegetales: infusión de ajenjo ('Artemisia absinthium L.').
Authors: Fernández-Cervantes Marcos , Pérez-Alonso María José
Published: December 2019

Con el fin de profundizar en el conocimiento relativo a las plantas medicinales y a los remedios tradicionales que de ellas se derivan, se ha analizado la composición química de la planta de ajenjo (Artemisia absinthium L.) y de su infusión. Tanto en la planta como en la infusión se ha determinado la presencia de fenoles, taninos, flavonoides y terpenoides mediante ensayos cualitativos. Los análisis llevados a cabo mediante cromatografía de gases acoplada a espectrometría de masas (GC-MS) han permitido identificar (Z)-β-epoxiocimeno (8,2%), isobutirato de nerilo (7,53%), β-tuyona (7,20%), isobutirato de geranilo (6,85%), butirato de geranilo (6,53%) y acetato de trans-crisantemilo (5,19%) como los componentes mayoritarios del aceite esencial de la planta, y, por otro lado, α-bisabolol (11,87%), (Z)-β-epoxiocimeno (10,82%), camazuleno (9,72%), geraniol (8,67%), nerol (8,29%) y espatulenol (7,46%) como mayoritarios en la infusión. La presencia de estos volátiles en la infusión de ajenjo se ha confirmado por primera vez en este trabajo.
Hemogram and Biochemical Reference Values for Brotogeris chiriri (Psittaciformes: Psittacidae)
Authors: Gomes Paula Damasceno , Tessari Hedermy Christiem Cerqueira de Paula , Furtado Adriana Pereira , Paludo Giane Regina , Hirano Líria Queiroz Luz
Published: December 2019

Despite the large distribution of the Yellow-chevroned Parakeet in Cerrado biome, there are few studies on biological parameters in this species. The lack of information on free-living parakeets is a limiting factor for establishing data on the health and conservation status of these species. The aim of this study was to standardize hemogram and blood biochemistry values for specimens of Brotogeris chiriri. Blood samples were collected from 21 young, clinically healthy and free-living specimens from the Cerrado biome. The mean, median, standard deviation and intervals were calculated for the following hematological parameters: packed cell volume (PCV), red blood cells, hemoglobin, mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), leukocytes, heterophils, eosinophils, lymphocytes, monocytes and thrombocytes; and blood biochemistry parameters: uric acid, aspartate aminotransferase, alanine aminotransferase, gamma-glutamyl transferase, alkaline phosphatase, total protein and albumin. Lower values of hemoglobin, MCV and MCHC when compared to the erythrogram interval of species belonging to the same genus and family, as well as a lymphocytic leukogram. The parameters related to blood biochemistry showed differences for alkaline phosphatase, presenting higher means values; and alanine aminotransferase, total protein and albumin, presenting lower means values when compared to other psittacids. This is a pioneer study to establish hematological and biochemical values for Brotogeris chiriri in the Cerrado biome. The importance of developing further studies to determine specific parameters for psittacid species is emphasized, with special regards to the effects of different stages of development, habitats and condition.
Corporate Governance and Audit Fees Evidence from Bangladeshi Listed Banks and NBFIs
Authors: Ghosh Tusher
Published: December 2019

The study examines influence of corporate governance mechanisms on audit fees in listed Bangladeshi banks and non-bank financial institutions (NBFIs) with Dhaka Stock Exchange. Data have been collected from published annual reports of the 46 firms covering the period of 2013-2017. Among them 30 firms are banking companies the remaining firms belong to NBFIs. Using fixed-effect model, the study finds that board independence, female member representation in board, board diligence as well as audit committee diligence have positive influence on audit fees. As opposed to previous literature, the study reports that in the context of Bangladeshi banks and NBFIs board size, audit committee size, audit committee independence are negatively associated with audit fees.
Friendship without Reciprocation? Aristotle, Nietzsche, and Blanchot
Authors: Romero-iribas Ana , Smith Graham M.
Published: December 2019

Must friendship involve reciprocity? Drawing on resources in the thought of Aristotle, Nietzsche, and Blanchot this article advances two claims. First, there isn't simply one form of reciprocity but various forms. The article names two such forms. “Reciprocity as exchange” casts reciprocation as active and involves exchange of benefits in a recognized cycle. In contrast, “reciprocity as correspondence” tolerates degrees of inactivity and connects friends by mutual admiration or commonality of purpose. Second, the article claims that while reciprocation is a feature of some friendships it is not necessary to all. It is possible to conceive of friendship without reciprocation. In these alternative friendships it is the separateness of the friends rather than their togetherness which is central. The article concludes that this minor strand of reciprocation suggests a form of political friendship based around a common heterogeneity, difference, and otherness.
Dual Mobility Bearing Articulations Result in Lower Rates of Dislocation After Revision Total Hip Arthroplasty
Authors: Li William T. , Kozick Zachary , Sherman Matthew , Restrepo Camilo , Smith Eric B. , Courtney P. Maxwell
Published: December 2019

Introduction:

The purpose of our study is to directly compare the rates of instability after revision total hip arthroplasty (THA) between a modular dual mobility (DM) and a conventional polyethylene single-bearing surface.

Methods:

We retrospectively reviewed a consecutive series of patients who underwent revision THA from 2012 to 2016 at a single institution with a minimum of 2 years of follow-up. Rates of re-revision, dislocation, complications, and short-form (SF-12) scores were compared between the DM and single-bearing groups. To control for confounding variables, a multivariate logistic regression analysis was performed.

Results:

Of the 267 revision THA patients, 94 patients had a DM bearing articulation (36%), whereas 173 patients (64%) had a conventional single-bearing with a mean follow-up of 37.8 months (range 24 to 73 months). The DM group was more likely to undergo revision THA for instability compared with the single-bearing group (8.5% versus 1.2%, P ≤ 0.005) but had reduced incidence of postoperative dislocations (2.1% versus 8.7%, P = 0.067) and no difference in the rates of re-revisions (9.6% versus 11.6%, P = 0.770). When controlling for confounding variables, patients who received a DM liner had lower rates of dislocation postoperatively than those of single-bearing (odds ratio 0.12, P = 0.019).

Discussion:

Even with a selection bias of surgeons using DM for patients at high risk of instability, patients undergoing revision THA with a DM bearing have reduced rates of dislocation at the intermediate-term follow-up. Further study is needed to identify any potential longer-term complications which may result from a modular DM bearing.
Telegram App in Learning English: EFL Students’ Perceptions
Authors: A. Abu-Ayfah Zahra
Published: December 2019

The rapid growth of mobile device technology and the emergence of new mobile device applications such as Telegram have created new opportunities for EFL students. Accordingly, the current study investigated the EFL College students’ perceptions of using Telegram for English language learning. The participants of the present study were 300 EFL college students, 200 female and 100 male were selected randomly from the department of English and Translation at Tibah University in AL-Medina AL-Manwarah in Saudi Arabia. This study followed a quantitative approach in which a survey questionnaire was utilized as an instrument for data collection. The results revealed that the majority of EFL students perceived Telegram as a useful tool for English language learning, particularly in vocabulary learning. The findings of the present study may contribute to developing the process of improving learning techniques in higher education in Saudi Arabia.
A Comparative Study between Monolingual and Bilingual Teaching Methodologies of English in a Health Sciences University in the United Arab Emirates
Authors: Mohamed Omnia Ibrahim , Lobo Zita
Published: December 2019

This study examines the monolingual and the bilingual methods of teaching English to investigate which method is more effective and best achieves the learning outcomes of a language course. It also examines which method is preferred by the English language learners and gives better performance results. The study was conducted in RAK Medical and Health Sciences University located in The United Arab Emirates. The participants were Arab students who were divided into two groups. Each group was exposed to a different teaching method but the curriculum was the same. Then a questionnaire was distributed to determine the method that was preferred by the students as well as the method which resulted in a better performance. The results of the survey and the students’ performance results showed that the bilingual method proves to be a more successful and convenient method in English classes than the monolingual method.
Reviewer Acknowledgements for Journal of Mathematics Research, Vol. 11, No. 4
Authors: Wang Sophia
Published: December 2019

Journal of Mathematics Research wishes to acknowledge the following individuals for their assistance with peer review of manuscripts for this issue. Their help and contributions in maintaining the quality of the journal is greatly appreciated.

Many authors, regardless of whether Journal of Mathematics Research publishes their work, appreciate the helpful feedback provided by the reviewers.

Reviewers for Volume 11, Number 4

 

Abimbola Abolarinwa, Landmark University, Nigeria

Ahmed Saad Rashed, Zagazig University, Egypt

Cibele Cristina Trinca Watanabe, Federal University of Tocantins (UFT), Brazil

Cinzia Bisi, Ferrara University, Italy

Denis Khleborodov, Lomonosov Moscow State University, Russia

Gener Santiago Subia, NUeva Ecija University of Science and Technology, Philippines

Hayat REZGUI, Ecole normale Supérieure de Kouba, Algeria

Jalal Hatem, Baghdad University, Iraq

Liwei Shi, China University of Political Science and Law, China

Maria Alessandra Ragusa, University of Catania, Italy

Martin Anokye, University of Cape Coast, Ghana

Mashadi Ali, Riau University, Indonesia

Mohammad A. AlQudah, German Jordanian University, Jordan

N. V. Ramana Murty, Andhra Loyola College, India

Özgür Ege, Ege University, Turkey

Philip Yordanoff Philipoff, Bulgarian Academy of Sciences, Bulgaria

Rami Ahmad El-Nabulsi, Athens Institute for Education and Research, Greece

Rovshan Bandaliyev, National Academy of Sciences of Azerbaijan, Azerbaijan

Sanjib Kumar Datta, University of Kalyani, India

Sergiy Koshkin, University of Houston Downtown, USA

Shenghua Ni, Vanderbilt University Medical Center, USA

Vishnu Narayan Mishra, Indira Gandhi National Tribal University, India

Xingbo WANG, Foshan University, China

Xinyun Zhu, University of Texas of the Permian Basin, USA

Zoubir Dahmani, University of Mostaganem, Algeria

 

Sophia Wang

On behalf of,

The Editorial Board of Journal of Mathematics Research

Canadian Center of Science and Education
Electric Heating and the Effects of Temperature on Household Electricity Consumption in South Africa
Authors: Berkouwer Susanna B.
Published: December 2019

How does temperature affect household energy demand in low-income countries? This paper uses 132,375,282 hourly electricity consumption observations from 5,975 households in South Africa to estimate the causal effects of short-term temperature changes on household electricity consumption. The estimates flexibly identify a constant log-linear temperature response—for every 1ଌ increase in temperature, electricity consumption decreases by 4.1% among temperatures below the heating threshold but increases by 8.1% among temperatures above the cooling threshold. This relationship is driven more strongly by seasonal than hourly temperature changes. Holding all else constant, a 3.25ଌ increase in temperatures would reduce electricity consumption by 1,093.4 kWh (6.2%) per year per household. Widespread use of electric heating due to limited residential gas heating infrastructure likely drives this. These results point to important regional heterogeneity in how temperature increases may affect household energy demand in the coming decades.
Extended algorithm to construct a quadtree from Freeman chain code in four directions
Authors: Nerat Andrej , Strnad Damjan , Zupančič Eva , Žalik Borut
Published: December 2019

This paper introduces improvements to the algorithm that was  proposed in 2001 by Chen and Chen. The algorithm constructs a quadtree directly from Freeman chain code in four directions. We have improved the algorithm in two ways: Firstly, a time efficient solution using the space filling Z-order curve is proposed for a self-intersection case  that was not considered by Chen and Chen. Secondly, the algorithm is expanded to handle geometric objects containing holes. The computational efficiency of the extended algorithm was confirmed by the experiments.
Resolution of the Wicksell's equation by Minimum Distance Estimation
Authors: Depriester Dorian , Kubler Régis
Published: December 2019

The estimation of the grain size in granular materials is usually performed by 2Dobservations. Unfolding the grain size distribution from apparent 2D sizes is commonly referred as the corpuscle problem. For spherical particles, the distribution of the apparent size can be related to that of the actual size thanks to the Wicksell’s equation. The Saltikov method, which is based on Wicksell’s equation, is the most widely used method for resolving corpuscle problems. This method is recursive and works on the finite histogram of the grain size. In this paper, we propose an algorithm based on a minimizing procedure to numerically solve the Wicksell’s equation, assuming a parametric model for the distribution (e.g. lognormal distribution). This algorithm is applied on real material and the results are compared to those found using Saltikov or Saltikov-basedstereology techniques. A criterion is proposed for choosing the number of bins in the Saltikov method. The accuracy of the proposed algorithm, depending on the sample size, is studied.
Emotions as a state and as a trait in people with depressive disorders*
Authors: Skiba Aleksandra , Maruszewska Paulina , Talarowska Monika , Gałecki Piotr
Published: December 2019

Depression is a disorder involving a number of changes in human psychosocial functioning. The aim of this study is to evaluate the intensity of positive and negative emotions understood both as a state and a permanent personality trait in people with depressive disorders and to determine whether the intensity of positive and negative emotions differentiates healthy people from people suffering from depressive disorders.
The study was conducted on 107 individuals – 67 people from the experimental group suffering from depressive disorders and 40 people from the control group with a negative interview in terms of mental and somatic disorders. The following tools were used: Hamilton Depression Rating Scale (evaluation of severity of depressive symptoms), STAI Questionnaire (evaluation of anxiety severity as a state and trait) and PANAS Questionnaire (intensity of negative and positive emotions as a state and trait).
A significantly higher intensity of positive emotions understood both as a state and a trait was observed in the people not suffering from depression, while the opposite results were obtained with regard to negative emotions, i.e. the individuals suffering from depression recorded lower scores than the healthy persons. It was also shown that the people with depression had higher scores in terms of the level of anxiety as a state and trait. The intensity of positive emotions as a state was significantly higher among the people with the first depressive episode in comparison to the people with recurrent depressive disorders. The severity of depression correlated positively with the intensity of negative emotions as a state both at the time of inclusion in the study and after obtaining a response to the applied pharmacological treatment.
Experienced positive and negative emotions, understood both as a state and as a trait, differentiate not only individuals with depression from healthy people, but also patients with the first depressive episode and those with recurrent depressive disorders.
Things that time forgot Native American objects in Danish Museums Problems and possibilities
Authors: Ahlqvist Laura , Bjørnevad Mathias , Riede Felix , Naum Magdalena
Published: December 2019

We present a hitherto unresearched part of a shared Danish and American cultural heritage: Native American objects in Danish regional museum collections. Thus far, we have identified more than 200 Native American artefacts in 27 local museums, largely a result of Danes abroad privately collecting in the late 1800s and 1950s–70s. The majority of these artefacts, many of which are prehistoric in age, have never been displayed and have lingered in storage since they were accessioned, understudied and often unrecognised for what they are. Recent deaccessioning pressures from the Danish Agency for Culture and Palaces potentially place these objects at risk of destruction, making the discussions presented here a timely issue. These Native American objects, like the unknown numbers of other non-Danish artefacts held by regional museums, hold tremendous potential to elucidate overlooked parts of Danish museum history, trans-Atlantic networks and interconnectedness in the nineteenth and twentieth centuries, as well as rich material cultures originating far from Denmark. We argue that this perspective is highly relevant and should be utilised in Danish museums, as it begets reflections on Danish glocal identity and society in a post-colonial world.
Envolvimento paterno na relação mãe-bebê: revisão integrativa da literatura
Authors: Menezes Marina de S. Lopes , Scorsolini-Comin Fabio , Santeiro Tales Vilela
Published: December 2019

O envolvimento paterno no desenvolvimento dos filhos tem cada vez mais despertado a atenção de estudiosos sobre família. O objetivo deste estudo é apresentar uma revisão integrativa da literatura científica, para identificar qual a relevância do envolvimento paterno para a relação mãe-bebê desde a gestação, e outras variáveis relacionadas a essa dinâmica familiar. Foi realizada uma consulta às bases de dados LILACS, PePSIC e SciELO, sendo recuperados 15 artigos publicados entre janeiro de 2004 e dezembro de 2015. As evidências têm reforçado a importância da presença paterna como integrante da rede de apoio à mulher na gestação, parto e puerpério, e para: estabelecimento dos vínculos entre pai e bebê/criança, fortalecimento da paternidade, promoção da saúde mental do filho e bem-estar da mulher. Esse tipo de achado ressalta a relevância e a necessidade de o pai repensar e discutir sua identidade social e familiar, com vistas a uma participação mais ativa no exercício da paternidade.
Cognitive Instruments Of Public Management Accountability For Development Of National Innovation System
Authors: Labunska Svitlana , Gavkalova Nataliia , Pylypenko Andriy , Prokopishyna Olena
Published: December 2019

The main aim of the research was to develop cognitive instruments that allow justification of decisions in national innovation policy. In the theoretical part of research fundamentals of national innovation policies of EU-members and Ukraine were compared to reveal factors that can accelerate innovation development. In the empirical part of research the analysis of innovation capability of Ukrainian enterprises was conducted based on financial, statistic and management reports and it confirmed that companies systematically conducted innovation activities, reached higher levels of innovation potential, innovative business opportunities and margin of economic security and, consequently, have more innovative capacities for innovation of all types.

The formation of cognitive analytical base allowed the application of scenario modelling at the level of public management of innovation activity. Cognitive modelling approach was justified firstly by increased volatility in economic conditions of modern realities of crisis in the national economy, and secondly high-cost and risky innovations, fast diffusion of information resources during the introduction of innovation processes, and thirdly, the presence of the mutual influence of objects of national innovation system.
Mapping the internal structures of fault zones of the sedimentary cover: a tectonophysical approach applied to interpret TDEM data (Kovykta gas condensate field)
Authors: Seminsky K. Zh. , Buddo I. V. , Bobrov A. A. , Misyurkeeva N. V. , Burzunova Yu. P. , Smirnov A. S. , Shelokhov I. A.
Published: December 2019

The article presents the results of studying the internal structures of platform fault zones with the use of a new tectonophysical approach to processing and interpretation of electrical exploration data obtained by the transient elec‐ tromagnetic method in the near field zone (TEM). In the study of the central part of the Kovykta gas condensate field (East Siberia, Russia), we applied the ideas of tectonophysics envisaging three stages of fault formation, which determine the three‐membered transverse zoning of a fully formed fault zone. Each subzone is characterized by a certain level of rock disturbance and corresponding electrical conductivity. Based on the analysis of electrical conductivity values, the boundaries can be determined between locations differing by the degrees of rock disturbance of the sedimentary stra‐ tum. Using a map of this parameter, it becomes possible to generally establish the boundaries of fault zones and specify internal subzones. The new approach was applied to assess the electrical conductivity of the reservoirs of the Kovykta field. It is established that there are several zones of faulting in the sedimentary stratum, which have not reached a final stage of development when a single fault plane is formed. Currently, these are zones of increased fracturing and dense occurrence of second‐order ruptures that are typical of platform settings due to their relatively weak tectonic activity. The zones are structurally non‐uniform, as evidenced by rheological layering of the sedimentary cover in the vertical cross‐section. A 3D electrical conductivity model of the largest fault zone in the study area shows alternating segments with more or less developed internal structures. Such segments are confined to layers that differ with respect to frac‐ turing. Exploration and development of hydrocarbon deposits can benefit from 3D modeling of large fault zones with the use of the tectonophysical approach for processing and interpretation of the TEM data. The models can provide addition‐ al arguments for improved decision making about locations for trouble‐free well drilling, as well as for selecting more effective methods for drilling sedimentary strata composed of complex horizontal layers.
Análisis de las fosas del yacimiento de la Edad del Bronce de Gózquez 087 (San Martín de la Vega, Madrid) = Analysis of Pits in the Bronze Age Site of Gózquez 087 (San Martin de la Vega, Madrid)
Authors: Pérez Villa Alberto
Published: December 2019

El presente estudio aborda el análisis de los denominados “campos de hoyos” desde una perspectiva cuantitativa, tratando de encontrar pautas en la presencia de los materiales de relleno de las fosas, así como en la distribución espacial de los restos y de las estructuras. Para ello se ha elegido un caso concreto de la Edad del Bronce madrileña, el yacimiento de Gózquez 087. Uno de los aspectos más importantes a abordar, será la posible existencia de diferencias entre los hoyos considerados de uso doméstico y aquellos que tuvieron un uso funerario, que muchas veces se han interpretado en clave ritual.AbstractThis study deals with the analysis of the commonly denominated «pit complex» since a quantitative perspective, trying to find patterns in the presence of the filling materials of the pits, as well as the spatial distribution of the remains and the structures. For this we select a specific case of Bronze Age in Central Iberia, the site of Gózquez 087. One of the most important aspects to be addressed will be the possible existence of differences between pits considered to be domestic use and those that had a funerary use, which have often been interpreted in ritual terms.
Los conflictos por la política de admisión de la Universidad de Costa Rica durante la década de 1950
Authors: Molina Jiménez Iván
Published: December 2019

Este artículo mostrará cómo la expansión de la segunda enseñanza costarricense, durante la década de 1950, supuso un incremento en el número de personas interesadas en ingresar a la educación superior. La Universidad de Costa Rica, por entonces la única institución de su tipo en el país, respondió a esa demanda creciente con una política de admisión improvisada y restrictiva, que truncó las expectativas de profesionalización de cientos de jóvenes. El descontento consiguiente se expresó en numerosos conflictos que enfrentaron a las autoridades universitarias con estudiantes, padres de familia, medios de comunicación, diversos sectores de la sociedad civil y con el Ministerio de Educación Pública. Debido a esa conflictividad creciente, la Universidad de Costa Rica decidió en 1956 eliminar por un breve período las pruebas de ingreso y experimentar con un nuevo sistema de selección de estudiantes basado en un curso de Estudios Generales. Sin embargo, esta reforma institucional no deparó los resultados esperados por las autoridades universitarias, por lo que en 1959 se estableció un examen de admisión obligatorio para todas las personas interesadas en ingresar a la enseñanza superior. La implementación de esta iniciativa volvió a restringir el acceso a la educación universitaria, con un claro sesgo de género, ya que la admisión de las mujeres se redujo más que la de los hombres.
Between dream and reality: The rehabilitation of war-disabled Belgian soldiers, 1914 – 1921
Authors: Verstraete Pieter
Published: December 2019

Este artículo pretende contribuir al creciente interés por la historia de la discapacidad, la historia de la educación de personas con discapacidad y la historiografía existente sobre la Gran Guerra. Se centrará en la rehabilitación de los soldados belgas ciegos y físicamente discapacitados. El artículo toma como punto de partida la ceremonia del Soldado Desconocido, que se celebró a principios de los años veinte. Aunque a todo el mundo le resulta familiar la Columna del Congreso de Bruselas y la llama eterna que arde en la tumba del soldado desconocido, pocos son los que conocen que fue un hombre ciego quien jugó un papel importante en la ceremonia fúnebre y que fueron ocho soldados físicamente discapacitados los que llevaron al soldado desconocido a su lugar de descanso final. En esta ceremonia, se creó implícitamente una imagen exitosa de rehabilitación y reeducación que mostraba que los soldados discapacitados podían volver a jugar un papel significativo en la sociedad. Esta imagen será desmenuzada a través de un estudio en detalle de las diversas fuentes que se preservan en los archivos de Flandes y Bruselas, incluidos los Archivos del Estado, los Archivos del Palacio Real, los del Museo Real de la Fuerzas Armadas e Historia Militar, los del Instituto Nacional Belga para los Veteranos y Víctimas de Guerra y los del St. Dunstan’s Institute en Londres. A partir del material fotográfico y los expedientes personales de los soldados discapacitados belgas, se  demostrará que la rehabilitación no fue en absoluto un «paseo por el parque» y que para un número de soldados sencillamente no fue posible. Más específicamente, nuestra presentación se centrará en las maneras en que el concepto de rehabilitación tomó forma en los institutos de rehabilitación belgas como el de Boschwoorde para soldados ciegos y la escuela de Port-Villez (Francia) para soldados discapacitados.
A resolução de problemas como um saber necessáro à formação de professores, uma matemática para ensinar
Authors: Morais Rosilda Dos Santos
Published: December 2019

El presente texto problematiza «resolución de problemas» y «Resolución de problemas» como cosas de diferentes naturalezas. Con este fin, guiado por la pregunta: ¿Se ha trabajado la resolución de problemas durante muchos años en términos de conocimiento que se debe enseñar «savoir à enseigner» y no como conocimiento para enseñar «savoir pour enseigner?». La resolución de problemas gana la escena y se reclama basado en marcos teóricos y metodológicos, estado epistemológico de saber enseñar, matemáticas para enseñar. Además, se afirma que tal conocimiento para  enseñar está en el corazón de la formación docente en matemáticas y su enseñanza. Para respaldar esta afirmación, destacan los documentos oficiales de Brasil, por ejemplo, la nueva Base Nacional Curricular Común (BNCC), todo lo cual subraya la importancia del trabajo de resolución de problemas. Finalmente, cuestionamos el papel desempeñado por George Polya como formador de maestros.