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Abstract  

We study classes of relative injective and projective comodules and extend well-known results about projective comodules given in [7]. The existence of covers and envelopes by these classes of comodules is also studied and used to characterize the projective dimension of a coalgebra. We also compare this homological coalgebra with the very intensively studied homological algebra of the dual algebra (see [5]).

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Acta Mathematica Hungarica
Authors:
M. Asensio
,
J. López Ramos
, and
B. Torrecillas
Restricted access

Abstract  

The effect of both formaldehyde content and catalyst type used in the synthesis of several resole type phenolic resins has been studied by using differential scanning calorimetry. In this study Kissinger-Akahira-Sunose (KAS), Ozawa-Flynn-Wall (OFW) and Friedman model-free kinetics are applied in order to correlate the dynamic cure behaviour with the mentioned synthesis variables. Strong upward dependency of activation energy on conversion has been detected in all cases up to a maximum value. Lower the formaldehyde content fewer changes in activation energy have been detected, revealing a more homogeneous polymerization. As formaldehyde content increases, stronger variations of energy values have been observed and the maximum value is shifted to lower conversions. By comparing triethylamine and sodium hydroxide catalysts similar behaviour has been observed, with higher energy values and shifting of the maximum in the latter. Friedman approach has been resulted in more convenient and accurate for the energy values determination and KAS method seems useful for the dynamic cure prediction of that type of thermoset.

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Journal of Thermal Analysis and Calorimetry
Authors:
M. López
,
M. Blanco
,
A. Vazquez
,
J. Ramos
,
A. Arbelaiz
,
N. Gabilondo
,
J. Echeverría
, and
I. Mondragon

Abstract  

The curing kinetics of nanocomposites based on phenolic resol cured with triethylamine (TEA) containing different amounts of organic montmorillonite was analyzed by differential scanning calorimetry. Kissinger-Akahira-Sunose (KAS) model-free kinetics has been applied to correlate the dynamic cure behaviour in the presence of modified montmorillonite. The effect in the curing of the use of different clay modifiers has also been studied. A commercial clay with hydroxyl groups (Cloisite 30B) and a customized montmorillonite (PheMMT) whose reactive groups induce condensation reactions with the resol matrix have been used. Strong dependency of activation energy on apparent conversion has been observed for all compounds.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
P. Lam Ramos
,
D. Frías Fonseca
,
M. González Garcia
,
D. Aguiar Lambert
,
J. Estévez Alvarez
,
I. Pupo González
, and
D. López Sánchez

Abstract  

The objective of the present study was the elaboration of a procedure for the determination of Y, La, Ce, Pr and Nd in soils by spectrophotometry with Arsenazo III preceded by a separation-concentration stage, which includes coprecipitation and ion exchange. Multielement analysis by energy dispersive X-ray fluorescence (including Y, La, Ce and Nd) and flame atomic absorption spectrophotometry was carried out simultaneously in order to obtain a general characterization of the soil samples. Certified reference materials and statistical intercomparison of the obtained results were used to evaluate the accuracy of the methods. The precision was examined by analyzing replicate samples.

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Journal of Behavioral Addictions
Authors:
Beáta Bőthe
,
Mónika Koós
,
Léna Nagy
,
Shane W. Kraus
,
Zsolt Demetrovics
,
Marc N. Potenza
,
Aurélie Michaud
,
Rafael Ballester-Arnal
,
Dominik Batthyány
,
Sophie Bergeron
,
Joël Billieux
,
Peer Briken
,
Julius Burkauskas
,
Georgina Cárdenas-López
,
Joana Carvalho
,
Jesús Castro-Calvo
,
Lijun Chen
,
Giacomo Ciocca
,
Ornella Corazza
,
Rita Csako
,
David P. Fernandez
,
Elaine F. Fernandez
,
Loïs Fournier
,
Hironobu Fujiwara
,
Johannes Fuss
,
Roman Gabrhelík
,
Ateret Gewirtz-Meydan
,
Biljana Gjoneska
,
Mateusz Gola
,
Joshua B. Grubbs
,
Hashim T. Hashim
,
Md. Saiful Islam
,
Mustafa Ismail
,
Martha C. Jiménez-Martínez
,
Tanja Jurin
,
Ondrej Kalina
,
Verena Klein
,
András Költő
,
Chih-Ting Lee
,
Sang-Kyu Lee
,
Karol Lewczuk
,
Chung-Ying Lin
,
Liverpool John Moores University's research team † Liverpool John Moores University's research team
,
Christine Lochner
,
Silvia López-Alvarado
,
Kateřina Lukavská
,
Percy Mayta-Tristán
,
Ionut Milea
,
Dan J. Miller
,
Oľga Orosová
,
Gábor Orosz
,
Sungkyunkwan University's research team †† Sungkyunkwan University's research team
,
Fernando P. Ponce
,
Gonzalo R. Quintana
,
Gabriel C. Quintero Garzola
,
Jano Ramos-Diaz
,
Kévin Rigaud
,
Ann Rousseau
,
Marco De Tubino Scanavino
,
Marion K. Schulmeyer
,
Pratap Sharan
,
Mami Shibata
,
Sheikh Shoib
,
Vera L. Sigre Leirós
,
Luke Sniewski
,
Ognen Spasovski
,
Vesta Steibliene
,
Dan J. Stein
,
Julian Strizek
,
Aleksandar Štulhofer
,
Berk C. Ünsal
, and
Marie-Pier Vaillancourt-Morel

Abstract

Background and aims

Despite its inclusion in the 11th revision of the International Classification of Diseases, there is a virtual paucity of high-quality scientific evidence about compulsive sexual behavior disorder (CSBD), especially in underrepresented and underserved populations. Therefore, we comprehensively examined CSBD across 42 countries, genders, and sexual orientations, and validated the original (CSBD-19) and short (CSBD-7) versions of the Compulsive Sexual Behavior Disorder Scale to provide standardized, state-of-the-art screening tools for research and clinical practice.

Method

Using data from the International Sex Survey (N = 82,243; M age = 32.39 years, SD = 12.52), we evaluated the psychometric properties of the CSBD-19 and CSBD-7 and compared CSBD across 42 countries, three genders, eight sexual orientations, and individuals with low vs. high risk of experiencing CSBD.

Results

A total of 4.8% of the participants were at high risk of experiencing CSBD. Country- and gender-based differences were observed, while no sexual-orientation-based differences were present in CSBD levels. Only 14% of individuals with CSBD have ever sought treatment for this disorder, with an additional 33% not having sought treatment because of various reasons. Both versions of the scale demonstrated excellent validity and reliability.

Discussion and conclusions

This study contributes to a better understanding of CSBD in underrepresented and underserved populations and facilitates its identification in diverse populations by providing freely accessible ICD-11-based screening tools in 26 languages. The findings may also serve as a crucial building block to stimulate research into evidence-based, culturally sensitive prevention and intervention strategies for CSBD that are currently missing from the literature.

Open access