Optimization Algorithm of Effective Stress Coefficient for Permeability

The effective stress coefficient for permeability is a significant index for characterizing the variation in permeability with effective stress. The realization of its accuracy is essential for studying the stress sensitivity of oil and gas reservoirs. The determination of the effective stress coefficient for permeability can be mainly evaluated using the cross-plotting or response surface method. Both methods preprocess experimental data and preset a specific function relation, resulting in deviation in the calculation results. To improve the calculation accuracy of the effective stress coefficient for permeability, a 3D surface fitting calculation method was proposed according to the linear effective stress law and continuity hypothesis. The statistical parameters of the aforementioned three methods were compared, and the results showed that the three-dimensional (3D) surface fitting method had the advantages of a high correlation coefficient, low root mean square error, and low residual error. The principal of using the 3D surface fitting method to calculate the effective stress coefficient of permeability was to evaluate the influence of two independent variables on a dependent variable by means of a 3D nonlinear regression. Therefore, the method could be applied to studying the relationship between other physical properties and effective stress.

Dreams and Nightmares during the First and Second Wave of the COVID-19 Infection: A Longitudinal Study

Recent literature shows that the Coronovirus-19 (COVID-19) pandemic has provoked significant changes in dreaming. The current study intends to provide an update about dream variable changes during the second wave of COVID-19. A total of 611 participants completed a web survey from December 2020 to January 2021. Statistical comparisons showed that subjects had lower dream-recall frequency, nightmare frequency, lucid-dream frequency, emotional intensity, and nightmare distress during the second than the first wave of the pandemic. Dreams had a higher negative tone during the second than first wave. We revealed significant differences concerning post-traumatic growth, sleep-related post-traumatic stress disorder (PTSD) symptoms and sleep measures between groups obtained as a function of the changes in the oneiric frequency between the first and second waves. We also found significant correlations between qualitative/emotional dream features and COVID-19-related factors (job change, forced quarantine, having COVID-19 infected relatives/friends, or asking for mental health help). Overall, we found that the second wave affected fewer quantitative features of dream activity and there was less emotional intensity. Moreover, we confirmed the relationship between nightmares and the high risk of PTSD when subjects were grouped as a function of the increasing/decreasing frequency. Finally, our findings are partly coherent with the continuity hypothesis between oneiric and waking experiences.

Dreaming during the COVID-19 lockdown: a comparison of Italian adolescents and adults

Based on the continuity hypothesis of dreaming, we have studied the effects of lockdown measures on Italian adolescents’ and adults’ dreams during the first wave of the coronavirus disease 2019 (COVID-19) pandemic. A sample of 475 subjects (73.9% women; 48.4% adolescents; ages 12-70 years, M=25.10, SD=12.2) was recruited via the Internet between April 17, 2020 and May 18, 2020. Participants were asked to provide socio-demographic data, as well as to report their Most Recent Dream. Results indicated that adults’ dreams were the longest, as well as characterized by higher emotional intensity, predominantly negative emotions, and a higher presence of sensory impressions. Furthermore, results indicated that the participants, especially adolescents, who were most directly affected by the COVID-19 pandemic reported the strongest effects on their dreams. Results also indicated that women recall dreams more often than men, in addition to reporting higher emotional intensity, predominantly negative emotions, and a higher presence of sensory impressions. Finally, results of the Thematic Analysis of Elementary Contexts showed that adults’ dreams seem to be centered, above all, on both pleasant memories linked to experiences that are now forbidden (i.e., traveling, meeting friends) as well as on nightmares, while adolescents’ dreams focused on relationships with others. Finally, both adults and adolescents reported dreams related to the experience of home confinement, which they described in terms of the negative emotions they experienced. In sum, the findings of this study indicate that the COVID-19 lockdown measures, understood as a contextual and traumatic event, significantly affect people’s oneiric lives, regardless of age.

The Complexity and Phylogenetic Continuity of Laughter and Smiles in Hominids

Laughter and smiles are often, but not always, associated with positive affect. These expressions of humans help to promote social relationships as well as the development of cognitive and socio-emotional skills and they may have a positive impact on health and well-being, hereby covering a selection of fitness-relevant benefits. Both laughter and smiles of positive affect also occur early in human development and across cultures, suggesting deep roots in human biology. The present work provides an evolutionary reconstruction of the evolution of human laughter and smiles of positive affect in form and function, based on the principle of maximum parsimony. According to the Complexity and Continuity Hypothesis, human laughter and smiles of positive affect must have evolved within the context of play from ancestral species. Furthermore, ancestral ape laughter and their open-mouth faces must already have been complex in form and function and changed over time via categorically different phylogenetic pathways to become characteristic, effective, and pervasive behaviors of everyday social interactions in humans.

Dreaming About One’s Own Children: An Online Survey

Social interactions with close persons are very important and one would expect – according to the continuity hypothesis of dreaming – that the dreamer's own children would show up in dreams quite frequently. So far the extent to which dreams include the dreamer’s own children has not been studied systematically. Overall, 1695 persons (960 women, 735 men; age mean: 53.84 ± 13.99 years) completed an online survey that included questions about dreams and waking-life experiences with their children. The findings indicate parents dream about their children in 17% of the remembered dreams, whereas participants without children only dream about having fictive children in the dream in less than 3% of all their recalled dreams. Results indicate that average emotional tone of the dreams with their own children was positive, but dreams might also focus on conflicts and worries as the mean emotional tone within dreams was less positive that the mean estimates of the emotional tone of the waking-life relationship. This first study on the frequency with which a dreamer’s own children appear in their dreams is a starting point to take a closer look at the way the parent-child relationship is reflected in dreams.

Partners and Ex-Partners in Dreams: A Diary Study

Romantic relationships are an important part of human life and thus, according to the continuity hypothesis of dreaming, one’s romantic partner should show up in dreams quite frequently. The present study is based on 1612 dream reports provided by 425 students. The findings confirmed the hypothesis that partner dreams are more frequent than ex-partner dreams and, thus, support the continuity hypothesis of dreaming. Moreover, interactions with ex-partners within the dream were more often negatively toned compared to dreamed interactions with the partner. Unexpectedly, we also found more positive emotions and friendliness in ex-partner dreams compared to partner dreams, indicating that partner dreams are more mundane. To conclude, dreams reflect important aspects of romantic partnerships and their break-ups and, thus, can be very helpful in psychotherapy.

191 Dream features of the Italian population across the first and second wave of the COVID-19 pandemic

Introduction The Italian government has responded to the second wave of the COVID-19 pandemic (autumn 2020) with a partial lockdown (PL). Here we aim to investigate the effects of the PL on dream features in the Italian population and to follow up on previous data collected during the total lockdown (TL) effected during the first wave of the pandemic (spring 2020). Methods Using a longitudinal approach, 214 participants (Mage=36.78±14.2y; 159F) who had participated in a previous survey (April 2020 – TL) completed the same online survey from November 10th to December 1st (PL). The questionnaires administered included the Pittsburgh Sleep Quality Index (PSQI) and a set of specific ad hoc questions on dream features (frequency, length, vividness, emotional tone, relation of content to the current health emergency) and their possible changes relative to the month preceding the lockdown, resulting in four time points (pre-TL, TL, pre-PL, PL). Results Frequency and length of dreams significantly increased from pre-PL to PL (both p’s<.01), while no difference emerged for vividness. As in TL, almost 30% of the subjects reported having COVID-19-related dreams during PL and, among these, 51% reported to face, in these dreams, problematic situations similar to those of their daily life. Both PSQI and dream negative emotionality scores significantly increased from pre-TL to TL, decreased in pre-PL and increased again in PL, indicating a parallel worsening of sleep quality and dream emotionality with both lockdowns. Dream negative emotionality in PL also showed positive correlations with PSQI scores and with negative mood, stress levels, general fear and fear about the COVID-19. Conclusion In line with the continuity hypothesis on the relationships between dreaming and the wake state, our data confirm that dream features are significantly and immediately affected by major life changes such as those brought about by the COVID-19 pandemic and related restrictions. Interestingly, dream emotionality and subjective sleep quality show a parallel profile across the different time points, suggesting the possible role of sleep quality as a modulating factor on dream affect. Support (if any) N/A

Dreaming in Adolescents During the COVID-19 Health Crisis: Survey Among a Sample of European School Students

According to the continuity hypothesis of dreaming and contemporary psychodynamic approaches, dreams reflect waking life. The aim of the present study was to explore the relationship between the COVID-19 pandemic and dreaming in adolescents. A cross-sectional survey was conducted in Italy, Romania and Croatia involving 2,105 secondary school students (69% girls, mean age 15.6 ± 2.1 years; 31% boys, mean age 15.1 ± 2.2 years; mean age of whole sample 15.4 ± 2.1 years). No substantial differences between countries were found. Thirty-one percent of the participants reported heightened dream recall, 18% noticed an increase in nightmares during the lockdown, and 15% of the provided dreams (n = 498) included pandemic-related content. The results indicate that subjective emotional reactions to lockdown had a significantly higher correlation to dreaming than objective distress (i.e., illness or death of a close one because of COVID-19). These findings suggest that attention to dreams should be included in preventive programs for adolescents with pandemic-related stress.

Animals in Dreams of Children, Adolescents, and Adults: The UK Library Study

Animal dreams have fascinated mankind for ages. Empirical research indicated that children dream more often about animals than adults and dogs, cats, and horses are the most frequent animals that appear within dreams. Moreover, most dreamer-animal interactions are negative. The present study included 4849 participants (6 to 90 yrs. old) reporting 2716 most recent dreams. Overall, 18.30% of these dreams included animals with children reporting more animal dreams that adolescents and adults. The most frequent animals were again dogs, horses, and cats; about 20% of the dream animals were in fact pets of the dreamers. About 30% of the dream animals showed bizarre features, e.g., metamorphosing into humans or other animals, bigger than in real life, or can talk. Taken together, the findings support the continuity hypothesis of dreaming but also the idea that dreams reflect waking-life emotions in a metaphorical and dramatized way. Future studies should focus on eliciting waking-life experiences with animals, e.g., having a pet, animal-related media consumption, and relating these to experiences with animals in dreams.

Can general and particularistic types of trust mix? Advancing the trust (dis-) continuity debate in a Chinese context

PurposeWe challenge the discontinuity (also called incompatibility) hypothesis of generalized and particularistic trust, suggesting that the two types of trust are incompatible. This view is problematic because if so, it remains unclear, for instance, how communities scoring high in particularistic trust can ever develop further when transferring trust to spheres outside the community is not an option. In this research, we explore the potential permeability of different types of trust in an emerging market context using the case of China.Design/methodology/approachUsing a purposeful sampling technique, we gathered data among Chinese professionals (n = 290) in the Jingjinji Metropolitan Region in Tianjin. We analyzed the data by performing structural equation modeling.FindingsAs we identify interdependencies between generalized and particularistic types of trust, our results speak in favor of the continuity hypothesis. We find that the more people trust other people from an outside group (out-group trust), the less they trust quasi-familiar others (in-group trust). Further, in-group trust increases once the environment urges people to engage in informal network (guanxi)-based transactions.Originality/valueAdvancing the common view of China being a typical low-trust society, in which distrust in strangers (outsiders) prevails, we find a recent trend of an increase in general trust, which might lead to increases of out-group and in-group trust alike. Contrary to the wide spread idea that guanxi is declining in the present day, we find guanxi to be persistent.