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At all scales, porous materials stir interstitial fluids as they are advected, leading to complex (and chaotic) distributions of matter and energy. Of particular interest is whether porous media naturally induce chaotic advection in Darcy flows at the macroscale, as these stirring kinematics profoundly impact basic processes such as solute transport and mixing, colloid transport and deposition and chemical, geochemical and biological reactivity. While the prevalence of pore-scale chaotic advection has been established, and many studies report complex transport phenomena characteristic of chaotic advection in heterogeneous Darcy flow, it has also been shown that chaotic dynamics are prohibited in a large class of Darcy flows. In this study we rigorously establish that chaotic advection is inherent to steady three-dimensional (3-D) Darcy flow with anisotropic and heterogeneous hydraulic conductivity fields. These conductivity fields generate non-trivial braiding of streamlines, leading to both chaotic advection and (purely advective) transverse macro-dispersion. We establish that steady 3-D Darcy flow has the same topology as unsteady 2-D flow and use braid theory to establish a quantitative link between transverse dispersivity and Lyapunov exponent in heterogeneous Darcy flow. Our main results show that chaotic advection and transverse dispersion occur in both anisotropic weakly heterogeneous and in heterogeneous weakly anisotropic conductivity fields, and that the quantitative link between these phenomena persists across a broad range of conductivity fields. As the ubiquity of macroscopic chaotic advection has profound implications for the myriad processes hosted in porous media, these results call for re-evaluation of transport and reaction methods in these systems.
Edited by
Geetha B. Nambissan, Jawaharlal Nehru University, New Delhi,Nandini Manjrekar, Tata Institute of Social Sciences, Mumbai,Shivali Tukdeo, Indira Mahindra School of Education, Mahindra University, Hyderabad,Indra Sengupta, German Historical Institute London
Research has pointed to important psychopathological differences between persistent and episodic depressive disorders. Here, we tested the hypothesis that people with persistent rather than episodic depression have difficulty revising established expectations in response to novel positive information. In terms of underlying mechanisms, we predicted that these differences between the two subtypes would be related to the engagement in cognitive immunization (i.e. devaluing expectation-disconfirming positive information).
Methods
Prior to their psychotherapeutic treatment, 54 outpatients with persistent depressive disorder and 102 outpatients with episodic major depressive disorder completed an experimental task. In this task, participants watched other patients’ reports of positive effects of psychotherapy. Our primary outcome was change in treatment expectations from before to after watching the positive reports.
Results
Overall, people with persistent depression had lower treatment expectations than people with episodic depression. In addition, they changed their treatment expectations less in response to other patients’ positive reports. This effect was greater for psychotherapy outcome expectations than for role expectations. The lack of expectation change in persistent depression relative to episodic depression was particularly pronounced in a cognitive immunization-promoting experimental condition.
Conclusions
The results indicate that people with persistent depression have difficulty adjusting their treatment expectations in response to positive information on psychotherapy. This may be a risk factor for poor treatment outcome. The results regarding cognitive immunization suggest that for people with persistent depression, slight doubts about the value of information on the positive effects of psychotherapy may be sufficient to prevent them from integrating this information.
Edited by
Geetha B. Nambissan, Jawaharlal Nehru University, New Delhi,Nandini Manjrekar, Tata Institute of Social Sciences, Mumbai,Shivali Tukdeo, Indira Mahindra School of Education, Mahindra University, Hyderabad,Indra Sengupta, German Historical Institute London
While much discussion has focused on what researchers do and should do in second language proficiency assessment, less attention has been given to why persistent trends continue. This study investigated second language acquisition (SLA) researchers’ beliefs, reported practices, and decision-making rationales regarding proficiency assessment. Using an online survey, we collected responses from 111 SLA researchers. Findings revealed that while researchers generally endorsed recommended methodological standards, practical constraints—such as time, accessibility, and ease of administration—frequently influenced their reported practices. A consistent belief–practice gap emerged across several key areas. Notably, reduced redundancy tests were rated favorably for both validity and practicality, reflecting a growing shift toward efficient, validated tools. These findings suggest that although methodological awareness is high, practical barriers continue to challenge the adoption of more rigorous proficiency assessment practices in SLA research.
Social disadvantage can result in healthcare gaps and primary care may be a suitable healthcare context to identify unmet social needs. A variety of screening tools exists but none of them is consolidated in clinical practice. After reviewing the available instruments, we conducted a rigorous translation and trans-cultural adaptation into Italian language of the EveryONE social need screening tool questionnaire of the American Academy of Family Physicians. The translated questionnaire was piloted among 45 patients consecutively recruited in two general practices in the northern Italian city of Modena in 2023 and obtained excellent scores in comprehension and acceptability. The cross-cultural adaptation presented in this study is a first step towards a complete validation. A full validation study is needed to safely adopt EveryONE in routine general practice and to evaluate its effects on health provision.
Edited by
Geetha B. Nambissan, Jawaharlal Nehru University, New Delhi,Nandini Manjrekar, Tata Institute of Social Sciences, Mumbai,Shivali Tukdeo, Indira Mahindra School of Education, Mahindra University, Hyderabad,Indra Sengupta, German Historical Institute London
We study convection in a volumetrically heated fluid which is cooled from both plates and is under rotation through the use of direct numerical simulations. The onset of convection matches similar systems and predictions from asymptotic analysis. At low rotation rates, the fluid becomes more organised, enhancing heat transport and increasing boundary layer asymmetry, whereas high rotation rates suppress convection. Velocity and temperature statistics reveal that the top unstably stratified boundary layer exhibits behaviour consistent with other rotating convective systems, while the bottom boundary shows a unique interaction between unstable stratification and Ekman boundary layers. Additional flow statistics such as energy dissipation are analysed to rationalise the flow behaviour.
This chapter frames the collaboration between Gertrude Stein and Pablo Picasso in the making of the 1906 portrait of Stein as a struggle over the modernist representation of the face. Having started the portrait with the sitter in front of him, Picasso famously erased Stein’s likeness and subsequently replaced it with a mask. Stein self-styled herself as an author and celebrity using Picasso’s portrait as a prop – as if it were a photograph. In turn, Stein’s literary portraits of Picasso attest to a desire for a radical erasure of the face, from memory and representation alike. The face nonetheless returns in the invocation of the proper name Picasso and through the intermedial dimensions of Stein’s portraiture writing. The chapter concludes by revisiting Nella Larsen’s use of the mask, specifically as the mask of whiteness, in her novel Passing (1929), a re-writing of Stein and Picasso’s experimentation with the racial dynamics of the mask.
David T. Sandwell, Scripps Institution of Oceanography, University of California, San Diego,Xiaohua Xu, University of Science and Technology of China,Jingyi Chen, University of Texas at Austin,Robert J. Mellors, Scripps Institution of Oceanography, University of California, San Diego,Meng Wei, University of Rhode Island,Xiaopeng Tong, Institute of Geophysics, China Earthquake Administration,John B. DeSanto, University of Washington,Qi Ou, University of Edinburgh
Chapter 7 introduces the basic concepts and fundamental limitations (i.e., residues) of phase unwrapping. It presents three common unwrapping methods: the global Fourier transform method, the path-following branch-cut method, and the minimum cost flow method. Additionally, it covers methods for correcting integer ambiguities using phase closure within stacks of interferograms.
The Indus Waters Treaty (IWT) of 1960, though subject to increasing stresses in recent decades (and “suspended” by India in 2025), was long hailed as one of the great success stories of international water disputes. A treaty negotiated to divide the Indus rivers to conform to the new territorial boundaries of the subcontinent’s 1947 partition, the IWT’s ultimate result was to effectively create two separate river basins operating in, and helping to define, distinctive Indian and Pakistani “national spaces” of water control—and “water nationalism.” However, another effect of this approach was also to encourage increasing internal competition—and conflict—over water within each country. This article argues that the roots of this structure go back to the abstract, and environmentally disconnected, form of “nationalism” that dictated the drawing of the original 1947 partition line, and to the ways that state water policy—and the IWT itself—reflected and responded to this.
Pneumococcal conjugate vaccines (PCVs) have influenced population dynamics of Streptococcus pneumoniae in the nasopharynx and may have contributed to increased Staphylococcus aureus colonization. This study assessed the prevalence of colonization, antibiotic resistance patterns, and associated risk factors for colonization and co-colonization of S. aureus and S. pneumoniae in healthy Peruvian children post-PCV introduction. Nasopharyngeal swabs from children <24 months were collected in five hospitals in Lima (2018–2019). Microbiological identification and antibiotic susceptibility tests were performed, and multinomial regression evaluated factors influencing colonization. Among 894 children, 19.7% were colonized with S. aureus, 20.3% with S. pneumoniae, and 2.9% co-colonized. Of the 176 S. aureus strains isolated, 1.7% were methicillin resistant and 20.5% were clindamycin resistant; no resistance to trimethoprim-sulfamethoxazole (SXT) was found. Among 182 S. pneumoniae strains isolated, 48.9% were resistant to macrolides, 74.7% to SXT; no resistance to penicillin was found. Breastfeeding and vaccination with PCV13 were associated with a reduced prevalence of S. aureus colonization, while vaccination with PCV13 increased the prevalence of S. pneumoniae colonization, mainly by non-vaccine serotypes. This study highlights the need to continue monitoring the changes in colonization dynamics and antimicrobial resistance patterns after vaccine introduction, to guide empirical therapy and future vaccine strategies.
Knowledge of the impact of perimenopause on women with attention-deficit/hyperactivity disorder (ADHD) is lacking. We compared levels of perimenopausal symptoms and prevalence of severe perimenopausal symptoms among women with and without ADHD across age groups.
Methods
In this cohort study, we used data from the population-based Stress-and-Gene-Analysis cohort study. ADHD diagnosis was self-reported at baseline and 5-year follow-up. At follow-up, we assessed ADHD symptoms using the Adult ADHD Self-Report Scale, perimenopausal symptoms (psychological, somatic, and urogenital) using Menopause Rating Scale (MRS), and general physical symptoms using Patient Health Questionnaire. We described mean scores and mean difference on MRS among women with and without ADHD with linear regression models and contrasted the prevalence of severe perimenopausal symptoms among women with and without ADHD, calculating prevalence ratios (PRs) with 95% confidence intervals (CIs) using modified Poisson regression models.
Results
Women with ADHD (n = 535) had higher total perimenopausal symptom scores (18.0 vs. 13.0, p < 0.01) than women without ADHD (n = 4,857). The difference was most pronounced among women aged 35–39 years (19.0 vs. 12.5, p < 0.01). The prevalence of severe perimenopausal symptoms was significantly higher among women with ADHD compared to those without, both overall (54.2% vs. 30.1%, PR = 1.80, 95% CI = 1.64–1.98) and on all subdimensions (psychological: 58.6% vs. 36.0%, PR = 1.63, 95% CI = 1.51–1.76; somatic: 30.4% vs. 13.9%, PR = 2.20, 95% CI = 1.88–2.57; uro-genital: 43.2% vs. 27.5%, PR = 1.57, 95% CI = 1.40–1.77).
Conclusion
Women with ADHD have higher prevalence of severe perimenopausal symptoms. These symptoms present at an earlier age than among women without ADHD, indicating an earlier onset age of perimenopause in ADHD.
Three potential climate futures — 1.5 °C, 2 °C, and 3.6 °C — are predicted by the UNFCCC’s ‘climate action pathways’, each with major and escalating implications for adaptation and mitigation. Marina Romanello, Co-Lead Health Editor for The Monitor, highlights the dangers of anything above a 1.5 °C scenario, emphasizing increased health risks and economic damages. The chapter outlines the CVF Monitor’s projections for each of the three scenarios and discusses the significant differences in outcomes depending on global warming levels. Stressing the importance of adhering to international agreements like the Paris Agreement, immediate and substantial emissions reductions are crucial to avoid catastrophic impacts. The chapter underscores the need for global cooperation in achieving these goals.
An increasing number of disaster relief programs rely on weather data to trigger automated payouts. However, several factors can meaningfully affect payouts, including the choice of data set, its spatial resolution, and the historical reference period used to determine abnormal conditions to be indemnified. We investigate these issues for a subsidized rainfall-based insurance program in the U.S. using data averaged over 0.25° × 0.25° grids to trigger payouts. We simulate the program using 5x finer spatial resolution precipitation estimates and evaluate differences in payouts from the current design. Our analysis across the highest enrolling state (Texas) from 2012 to 2023 reveals that payout determinations would differ in 13% of cases, with payout amounts ranging from 46 to 83% of those calculated using the original data. This potentially reduces payouts by tens of millions annually, assuming unchanged premiums. We then discuss likely factors contributing to payout differences, including intra-grid variation, reference periods used, and varying precipitation distributions. Finally, to address basis risk concerns, we propose ways to use these results to identify where mismatches may lurk, in turn informing strategic sampling campaigns or alternative designs that could enhance the value of insurance and protect producers from downside risks of poor weather conditions.
The chapter explains the process of annotating constructions for semantic roles. Constructions expressing nine semantic fields have been annotated, with each noun phrase, adjective phrase, or clause in the construction given one of a finite set of labels. The process is compared with approaches to role identification taken in Corpus Pattern Analysis (Hanks), Systemic Functional Grammar (Halliday and Matthiessen), Local Grammar (Barnbrook, Su) and FrameNet (Fillmore). The role names used in this book, with their definitions, are listed for each of the nine semantic fields used as examples.