Classical Definition Research Articles

Between Struggle, Forgetfulness, and Placemaking: Meanings and Practices among Social Groups in a Metropolitan Urban Park

Urban spatial segregation in Santiago de Chile, a prevalent feature of Latin American cities, underscores socioeconomic disparities and shapes the city’s socio-spatial dynamics. This segregation, driven by land prices and private ownership, has pushed disadvantaged groups to the periphery and limited their access to desirable areas reserved for wealthier segments of society. Quebrada Macul Park, situated within this segregated urban landscape, serves as an emblematic case that challenges and expands the classical definition of urban segregation. It exemplifies the complex negotiations over space utilization among social groups, defined by socioeconomic, generational, and interest-based differences. This study employs micro-segregation studies in a broad sense, both as a conceptual framework and as a methodological tool to analyze these dynamics. Through qualitative methodologies, including six in-depth interviews with diverse stakeholders (social and ecological activists, longtime residents, and park employees) and five participant observations, the research investigates the varied uses and meanings attributed to the park. The findings reveal that the park’s evolution from a space frequented by low-income dwellers to a diverse metropolitan park has sparked debates over its public versus private character, mirroring the power struggles among distinct social factions. The park serves as a profound identity marker for its historical inhabitants, who initially fought for the right to use it and today experience nostalgia due to its widespread popularity. Meanwhile, the struggle to establish the park as a public space challenges the city’s segregation dynamics and might promote social cohesion within urban natural environments.

Correlation between geomechanical and sedimentary facies and their implications for flow unit definition in the pre-salt carbonate reservoir, Brazil

Carbonate reservoirs are of great economic importance due to their frequent association with high permeability and hydrocarbon storage capacity. One of the most significant discoveries of this type of reservoir in recent decades has been the Brazilian Pre-salt. This deep reservoir has unusual depositional features, consisting of a wide variety of textures with different compositions, influenced by diagenetic overprinting that modify most of its mechanical, elastic and petrophysical properties. Despite the marked heterogeneity, these carbonates are characterized by excellent reservoir quality. The objective of this study is to establish a correlation between geomechanical behavior and sedimentary facies and its implications for the definition of flow units in the Barra Velha Formation, the main reservoir of the Brazilian Pre-salt. Thus, using a database from the Buzios field composed of well logs (conventional and advanced), well tests, thin sections, and laboratory petrophysics, geomechanical facies (GMFs) were defined using dynamic geomechanical modeling and an unsupervised algorithm (K-mean clutering), followed by textural classification of sedimentary facies and definition of flow units (FUs) on the decametric scale. These classifications were compared using frequency histograms. The geomechanical model revealed that the in-situ stress state exhibits a dual regime, between normal and strike slip. In addition, it was found that the direction of the maximum horizontal stress is in the NE-SW azimuth. In this context, four geomechanical facies were defined, which showed a notorious variation in mechanical strength. The strongest GMFs consisted mainly of well-cemented Grainstones and Packstones with no apparent porosity or microcrystalline porosity and correlated with the FU with the worst production rates. On the other hand, the weaker GMFs were mainly composed of Grainstones and Spherulistones with high intergranular porosity generated by dissolution processes, with higher risk of pore collapse and correlated with the FUs with the best production rates. However, this classification also identified laminated mudstones with microporosities associated with FUs that act as flow barriers. Geomechanical facies have also been incorporated into reservoir development by evaluating wellbore stability, fault reactivation risk, and brittleness index for future CO2 injection projects.

A machine learning-based lung ultrasound algorithm for the diagnosis of acute heart failure.

Lung ultrasound (LUS) is an effective tool for diagnosing acute heart failure (AHF). However, several imaging protocols currently exist and how to best use LUS remains undefined. We aimed at developing a lung ultrasound-based model for AHF diagnosis using machine learning. Random forest and decision trees were generated using the LUS data (via an 8-zone scanning protocol) in patients with acute dyspnea admitted to the Emergency Department (PLUME study, N = 117) and subsequently validated in an external dataset (80 controls from the REMI study, 50 cases from the Nancy AHF cohort). Using the random forest model, total B-line sum (i.e., in both hemithoraces) was the most significant variable for identifying AHF, followed by the difference in B-line sum between the superior and inferior lung areas. The decision tree algorithm had a good diagnostic accuracy [area under the curve (AUC) = 0.865] and identified three risk groups (i.e., low 24%, high 70%, and very high-risk 96%) for AHF. The very high-risk group was defined by the presence of 14 or more B-lines in both hemithoraces while the high-risk group was described as having either B-lines mostly localized in superior points or in the right hemithorax. Accuracy in the validation cohort was excellent (AUC = 0.906). Importantly, adding the algorithm on top of a validated clinical score and classical definition of positive LUS scanning for AHF resulted in a significant improvement in diagnostic accuracy (continuous net reclassification improvement = 1.21, P < 0.001). Our simple lung ultrasound-based machine learning algorithm features an excellent performance and may constitute a validated strategy to diagnose AHF.

Classification of molds and definition of mold contamination

Classification of molds and definition of mold contamination

Right to Freedom of Religion: Dynamics of Conceptual Evolution

This article analyzes the dynamics of the content of the freedom of religion aiming to reflect the transformation of the right to freedom of religion in historical perspective and forming generalized models of such content, as well as prognosing the prospects for further dynamics of these changes. The relevance of the study is justified by several factors. Firstly, the issue of exercising the right to freedom of religion is urgent in the context of the growing number of followers of various religions, as well as the use of religious narratives for political purposes. Secondly, contemporary factors shaping post-secular society (diversification of attitudes towards religion and types of religiosity) contribute to the erosion of the classical definition of the subject of freedom of religion. Thirdly, forecasting the further development of freedom of religion requires an analysis of its formation and historical transformations, which remains insufficiently studied in domestic doctrine. The article argues that the content (subject) of freedom of religion (especially within the European tradition of understanding it) has undergone significant changes, influencing the concepts and scope of state-confessional interaction, as well as the principles of defining relevant norms. Therefore, it is necessary, having examined individual epochs of the formation of freedom of religion, to identify its general meaning and development trends. Such research is conducted based on historical-legal sources and doctrinal knowledge. It is argued that the historical development of freedom of religion demonstrates its dynamic evolution and the acquisition of an increasingly broader scope. The ancient vision of freedom of religion is characterized by the assertion of adherence to one of the alternative cults (territorially defined) as a legal duty. However, the common background (principle) of all cults does not allow for choice and thus leads to the implicit leveling of the significance of freedom of religion. In medieval law, freedom of religion is explicitly leveled; adherence to a single cult is affirmed as a legal duty (reception of obligation with denial of alternative compared to antiquity). Actual freedom of religion emerges in modern times as the ability of individuals to choose and change beliefs freely and to freely practice their religion. This process is accompanied by the formation of a secular state. Partial freedom of religion, based on limited state-sanctioned choice, later transforms into full freedom with unrestricted free choice. Such a concept prevails in international law and national legislation currently. Further development of freedom of religion is possible in the context of challenges of post-secular society, including diversification of attitudes towards religion and types of religiosity, as well as the spread of a worldview based on non-religious faith. This concept has now seen the most development in the practice of interpretation and application of the European Convention on Human Rights, as set out in the decisions of the European Court of Human Rights. This practice requires detailed study in further research.

The Management of Mild Pulmonary Hypertension in Clinical Practice.

The definition of pulmonary hypertension (PH) has been revised recently, with the mean pulmonary artery pressure (mPAP) threshold (assessed by right heart catheterization) reduced from ⩾25 mm Hg to >20 mm Hg. This change reflects the mPAP upper limit of normal and a lower limit that is independently associated with adverse outcomes. To improve the specificity of diagnosing pathogenic increases in mPAP, however, a diagnosis of precapillary PH now also includes pulmonary vascular resistance >2.0 Wood units (WU) (lowered from >3.0 WU). These changes are positioned to capture approximately 55% more patients with PH. Because all clinical trials showing a benefit of pulmonary vasodilator therapy in precapillary PH used the classical hemodynamic definition, the approach to the diagnosis and management of patients with mild PH (i.e., mPAP 21-24 mm Hg and pulmonary vascular resistance 2-3 WU) requires particular consideration. Here, we use a question/answer format to discuss key areas in the management of mild PH, including practical information tailored to clinicians without training in PH.

Geographical thinking in geography education: a systematic review

Geographical thinking is often regarded as one of the most crucial outcomes of geography education. Nevertheless, with the growing variety of definitions and conceptualizations surrounding geographical thinking, the entire concept is becoming increasingly intricate and abstract, gradually acquiring a degree of internal shallowness. To address this complexity and enhance the clarity regarding these diverse definitions and conceptualizations, a systematic review was conducted. Following the PRISMA guidelines, a final selection of 50 records including empirical articles, books and book chapters, were analyzed. The main findings reveal insights on temporal development, spatial distribution, and possible classifications of geographical-thinking definitions and conceptualizations. The article concludes with a discussion of possible implications for educational practice and related recommendations for future research.

From Morphology to Molecules: Advances in the Distinction of Multiple Primary Lung Cancers From Intrapulmonary Metastases in Non-Small Cell Lung Cancer.

The increasing incidence of multiple lung nodules underscores the need for precise differentiation between multiple primary lung cancers (MPLCs) and intrapulmonary metastases (IPMs). This distinction impacts patient prognosis and treatment strategies. The prevalence of multiple lung nodules, ranging from 19.7% to 55.5%, highlights the clinical significance of this challenge. Historically, the role of histopathology, particularly comprehensive histology assessment (CHA), has been pivotal in differentiating MPLCs and IPMs. However, CHA has significant limitations, resulting in a constant search for a better way to distinguish those lesions. The best strategy for delineating MPLCs from IPMs is a multidisciplinary approach combining clinical data, radiology, histology, and molecular methods. Histology provides architectural and cellular characteristics, radiology contributes anatomic context and lesion characterization, and molecular methods reveal molecular features critical for accurate differentiation. Incorporating clinical data further enhances diagnostic precision. This review presents current knowledge and current approaches to multiple lung tumors. It is clear that even with a combination of pathology, radiology, and molecular data, definitive classification of multifocal lung tumors is not always possible.

The Golden Rule: A Defence

ABSTRACT According to the so-called golden rule, we ought to treat others as we want to be treated by them. This rule, in one form or another, is part of every major religion, and it has been accepted by many philosophers with various ethical views. However, if the literal golden rule is interpreted as an absolute rule, it is problematic. In this paper, I introduce a new version of this famous principle that is similar to various classical definitions. According to this variant, the rule can be formulated in the following way: If you want it to be the case that if x were in your situation and you were in x ’s situation then x would do H to you, and you have a good will, then you ought to do H to x. I show how this version can be derived from a small set of highly plausible premises, and I defend it against some of the most interesting and/or common objections against the golden rule in the literature. I conclude that we have good reason to believe in this rendition of the principle.

The Challenge of Defining the Secular

Judges have long wrestled with the gigantean task of defining religion, with some describing the task as being ‘called upon to ponder the imponderable’, an impossible task, and even misguided. Despite these sentiments, and comments in almost every legal definition expressing the impossibility of the task, judges have, in fact, been able to come up with numerous legal definitions for religion. These have been applied in myriad circumstances to define the outer limits of the rights and responsibilities of states, religious communities, organisations, and individuals. By contrast, the term secular has rarely been judicially defined. However, it is no-less important in defining the rights and responsibilities of states and their citizens and residents, particularly in light of the number of states that claim, implicitly or explicitly, to be secular. This paper, therefore, (re)examines the definition of the secular as it pertains to the concept of the secular state. It considers the need for a legal definition of the secular with particular reference to constitutional and other legal instruments that include the term. It then examines the difference between the terms secular, secularisation and secularism, noting the often erroneous conflation as well as the inevitable interaction and overlap between these key concepts. Finally, drawing on existing classifications of legal definitions of religion, the paper classifies definitions of the secular into three overarching classifications, namely ‘historical’, ‘substantive’ and ‘characteristic’.

A unified classification system for HIV-1 5' long terminal repeats.

The HIV-1 provirus mainly consists of internal coding region flanked by 1 long terminal repeats (LTRs) at each terminus. The LTRs play important roles in HIV-1 reverse transcription, integration, and transcription. However, despite of the significant study advances of the internal coding regions of HIV-1 by using definite reference classification, there are no systematic and phylogenetic classifications for HIV-1 5' LTRs, which hinders our elaboration on 5' LTR and a better understanding of the viral origin, spread and therapy. Here, by analyzing all available resources of 5' LTR sequences in public databases following 4 recognized principles for the reference classification, 83 representatives and 14 consensus sequences were identified as representatives of 2 groups, 6 subtypes, 6 sub-subtypes, and 9 CRFs. To test the reliability of the supplemented classification system, the constructed references were applied to identify the 5' LTR assignment of the 22 clinical isolates in China. The results revealed that 16 out of 22 tested strains showed a consistent subtype classification with the previous LTR-independent classification system. However, 6 strains, for which recombination events within 5' LTR were demonstrated, unexpectedly showed a different subtype classification, leading a significant change of binding sites for important transcription factors including SP1, p53, and NF-κB. The binding change of these transcriptional factors would probably affect the transcriptional activity of 5' LTR. This study supplemented a unified classification system for HIV-1 5' LTRs, which will facilitate HIV-1 characterization and be helpful for both basic and clinical research fields.

The Florida Scoring System for stratifying children with suspected Sjögren's disease: a cross-sectional machine learning study.

Childhood Sjögren's disease is a rare, underdiagnosed, and poorly-understood condition. By integrating machine learning models on a paediatric cohort in the USA, we aimed to develop a novel system (the Florida Scoring System) for stratifying symptomatic paediatric patients with suspected Sjögren's disease. This cross-sectional study was done in symptomatic patients who visited the Department of Pediatric Rheumatology at the University of Florida, FL, USA. Eligible patients were younger than 18 years or had symptom onset before 18 years of age. Patients with confirmed diagnosis of another autoimmune condition or infection with a clear aetiological microorganism were excluded. Eligible patients underwent comprehensive examinations to rule out or diagnose childhood Sjögren's disease. We used latent class analysis with clinical and laboratory variables to detect heterogeneous patient classes. Machine learning models, including random forest, gradient-boosted decision tree, partial least square discriminatory analysis, least absolute shrinkage and selection operator-penalised ordinal regression, artificial neural network, and super learner were used to predict patient classes and rank the importance of variables. Causal graph learning selected key features to build the final Florida Scoring System. The predictors for all models were the clinical and laboratory variables and the outcome was the definition of patient classes. Between Jan 16, 2018, and April 28, 2022, we screened 448 patients for inclusion. After excluding 205 patients due to symptom onset later than 18 years of age, we recruited 243 patients into our cohort. 26 patients were excluded because of confirmed diagnosis of a disorder other than Sjögren's disease, and 217 patients were included in the final analysis. Median age at diagnosis was 15 years (IQR 11-17). 155 (72%) of 216 patients were female and 61 (28%) were male, 167 (79%) of 212 were White, and 20 (9%) of 213 were Hispanic, Latino, or Spanish. The latent class analysis identified three distinct patient classes: class I (dryness dominant with positive tests, n=27), class II (high symptoms with negative tests, n=98), and class III (low symptoms with negative tests, n=92). Machine learning models accurately predicted patient class and ranked variable importance consistently. The causal graphical model discovered key features for constructing the Florida Scoring System. The Florida Scoring System is a paediatrician-friendly tool that can be used to assist classification and long-term monitoring of suspected childhood Sjögren's disease. The resulting stratification has important implications for clinical management, trial design, and pathobiological research. We found a highly symptomatic patient group with negative serology and diagnostic profiles, which warrants clinical attention. We further revealed that salivary gland ultrasonography can be a non-invasive alternative to minor salivary gland biopsy in children. The Florida Scoring System requires validation in larger prospective paediatric cohorts. National Institute of Dental and Craniofacial Research, National Institute of Arthritis, Musculoskeletal and Skin Diseases, National Heart, Lung, and Blood Institute, and Sjögren's Foundation.

Root Systems in Lie Theory: From the Classic Definition to Nowadays

Root Systems in Lie Theory: From the Classic Definition to Nowadays

The influence of thermal pressure gradients and ionization (im)balance on the ambipolar diffusion and charge-neutral drifts.

Solar partially ionized plasma is frequently modelled using single-fluid (1F) or two-fluid (2F) approaches. In the 1F case, charge-neutral interactions are often described through ambipolar diffusion, while the 2F model fully considers charge-neutral drifts. Here, we expand the definition of the ambipolar diffusion coefficient to include inelastic collisions (ion/rec) in two cases: a VAL3C one-dimensional model and a 2F simulation of the Rayleigh-Taylor instability (RTI) in a solar prominence thread based on [Lukin et al. 2024 Phil. Trans. R. Soc. A 382, 20230417. (doi:10.1098/rsta.2023.0417)]. On one side, we evaluate the relative importance of the inelastic contribution, compared to elastic and charge-exchange collisions. On the other side, we compare the contributions of ion/rec, thermal pressure, viscosity and magnetic forces to the charge-neutral drift velocity of the turbulent flow of the RTI. Our analysis reveals that the contribution of inelastic collisions to the ambipolar diffusion coefficient is negligible across the chromosphere, allowing the classical definition of this coefficient to be safely used in 1F modelling. However, in the transition region, the contribution of inelastic collisions can become as significant as that of elastic collisions. Furthermore, we ascertain that the thermal pressure force predominantly influences the charge-neutral drifts in the RTI model, surpassing the impact of the magnetic force. This article is part of the theme issue 'Partially ionized plasma of the solar atmosphere: recent advances and future pathways'.

Critical Theory Foundations of Digital Capitalism: A Critical Political Economy Perspective

The overall task of this paper is to outline some foundations of a critical theory of digital capitalism. The approach of the Critique of Political Economy is taken as the starting point for theorising (digital) capitalism. First, the paper discusses selected classical definitions of capitalism. Theories of digital capitalism must build on definitions and theories of capitalism. If capitalism is not only an economic order but a societal formation, the analysis of capitalism is the analysis of economic exploitation and non-economic domination phenomena and their interaction. Theories of digital capitalism should also address the question of how class, racism, and patriarchy are related in the context of digitalisation. Second, the author introduces a notion of digital capitalism that is based on Marx’s approach of the Critique of Political Economy. Third, the paper engages with one influential contemporary approach to theorising capitalism, Nancy Fraser’s Cannibal Capitalism. The author discusses what we can learn from Fraser’s approach to theorising digital capitalism. Fourth, the author discusses existing understandings of digital capitalism that can be found in the academic literature. These definitions are compared to the understanding advanced in this article. Fifth, the paper discusses the relationship of the notion of digital capitalism from a Critical Political Economy perspective in comparison to the notions of the network society/informational capitalism (Manuel Castells), surveillance capitalism (Shoshana Zuboff), and platform capitalism (Nick Srnicek). Sixth, the paper reflects on the relationship between digital capitalism and violence as we live in a (digital) age where a new World War is all but uncertain. Finally, some conclusions are drawn.

On cone-based decompositions of proper Pareto-optimality in multi-objective optimization

In recent years, research focus in multi-objective optimization has shifted from approximating the Pareto optimal front in its entirety to identifying solutions that are well-balanced among their objectives. Proper Pareto optimality is an established concept for eliminating Pareto optimal solutions that exhibit unbounded tradeoffs. Imposing a strict tradeoff bound in a classical definition of proper Pareto optimality allows specifying how many units of one objective one is willing to trade in for obtaining one unit of another objective. Recent studies have shown that this notion shows favorable convergence properties. One of the aims of this paper is to translate the proper Pareto optimality notion to an ordering relation, which we denote by M-domination. The mathematical properties of M-domination are thoroughly analyzed in this paper yielding key insights into its applicability as decision making aid and in designing population-based algorithms for solving multi-objective optimization problems. We complement our work by providing four different geometrical descriptions of the M-dominated space given by a union of polyhedral cones. A geometrical description does not only yield a greater understanding of the underlying tradeoff concept, but also allows a quantification of the hypervolume dominated by a particular solution or an entire set of solutions. These descriptions shall enable researchers to formulate hypervolume-based approaches for finding approximations of the Pareto front that emphasize regions that are well-balanced among their tradeoffs in subsequent works.

The branching patterns and termination points of the facial artery: a cadaveric anatomical study.

The facial artery is an important blood vessel responsible for supplying the anterior face. Understanding the branching patterns of the facial artery plays a crucial role in various medical specialties such as plastic surgery, dermatology, and oncology. This knowledge contributes to improving the success rate of facial reconstruction and aesthetic procedures. However, debate continues regarding the classification of facial artery branching patterns in the existing literature. We conducted a comprehensive anatomical study, in which we dissected 102 facial arteries from 52 embalmed and formaldehyde-fixed Vietnamese cadavers at the Anatomy Department, University of Medicine and Pharmacy, Ho Chi Minh City, Vietnam. Our investigation revealed eight distinct termination points and identified 35 combinations of branching patterns, including seven arterial branching patterns. These termination points included the inferior labial artery, superior labial artery, inferior alar artery, lateral nasal artery, angular artery typical, angular artery running along the lower border of the orbicularis oculi muscle, forehead branch, duplex, and short course (hypoplastic). Notably, the branching patterns of the facial artery displayed marked asymmetry between the left and right sides within the same cadaver. The considerable variation observed in the branching pattern and termination points of the facial artery makes it challenging to establish a definitive classification system for this vessel. Therefore, it is imperative to develop an anatomical map summarizing the major measurements and geometric features of the facial artery. Surgeons and medical professionals involved in facial surgery and procedures must consider the detailed anatomy and relative positioning of the facial artery to minimize the risk of unexpected complications.

Nodal staging in high and high-intermediate risk endometrial cancer surgery: Which role in the molecular classification era?

ObjectivesNodal staging contributes to risk group definition and the indication to adjuvant treatment in endometrial cancer (EC) patients. However, the role of nodal assessment evolved and requires redefinition.Primary outcome of the study was to assess the impact of surgical nodal staging in defining high-risk (HR) EC. Secondary outcome was to evaluate the contribution of nodal assessment to the decision for adjuvant treatment in both high-risk and high-intermediate risk (HIR) patients submitted to surgery. MethodsClinical stage I-II EC patients with postoperative diagnosis of HR and HIR disease were included. The contribution of nodal staging in prognostic groups allocation was assessed by reviewing HR patients to identify those without any other feature of such class (non-endometrioid histology, p53abn immunohistochemistry, post-operative T3-T4 disease) and HIR cases to assess how nodal staging affected adjuvant treatment indication. Descriptive statistics were conducted to describe the two populations. ResultsFifty-seven patients were included, 46 with HR and 11 with HIR disease. Chemotherapy and external-beam radiotherapy (EBRT) were proposed in 40 HR patients. Considering histology, immunohistochemical profile and FIGO stage, high risk classification was exclusively relied on nodal involvement in 2/46 cases (4.3 %). Omitting retroperitoneal staging, one of them would have been classified in the intermediate risk group and the other as HIR: without nodal staging, chemotherapy and EBRT would have been omitted in 1/40 (2.5 %) case.Among HIR patients, chemotherapy was proposed in 7/11 cases and EBRT in all cases. Adjuvant chemotherapy was indicated in 5/6 (83.3 %) and omitted in 1/6 (16.7 %) pN0 patient (stage Ib G2, substantial LVSI). In HIRpN0 patients, omitting nodal staging could have changed adjuvant treatment indication in 1/6 (16.7 %) case. In HIRpNx patients, adjuvant chemotherapy was omitted in one patient (stage II, grade 2 and LVSI negative): nodal staging unavailability might have changed indication to chemotherapy in 1/5 (20 %) case, without changing indication to EBRT.Unavailable nodal staging could globally be related to omission of chemotherapy in 2/57 (3.5 %) patients and of EBRT in 1/57 (1.8 %) patient. ConclusionsIn this series, nodal staging had limited impact on definition of HR class and on the choice of adjuvant treatment in HR and HIR EC patients.

Passivity-based control of underactuated mechanical systems with Coulomb friction: Application to earthquake prevention

Passivity property gives a sense of energy balance. The classical definitions and theorems of passivity in dynamical systems require time invariance and locally Lipschitz functions. However, these conditions are not met in many systems. Characteristic examples are nonautonomous and discontinuous systems due to the presence of Coulomb friction. This paper presents an extended result for the negative feedback connection of two passive nonautonomous systems with set-valued right-hand side based on an invariance-like principle. Such extension is the base of a structural passivity-based control synthesis for underactuated mechanical systems with Coulomb friction. The first step consists of designing the control able to restore the passivity in the considered friction law, achieving stabilization of the system trajectories to a domain with zero velocities. Then, an integral action is included to improve the latter result and perform a tracking over a constant reference (regulation). Finally, the control is designed considering dynamics in the actuation. These control objectives are obtained using fewer control inputs than degrees of freedom, as a result of the underactuated nature of the plant. The presented control strategy is implemented in an earthquake prevention scenario, where a mature seismogenic fault represents the considered frictional underactuated mechanical system. Simulations are performed to show how the seismic energy can be slowly dissipated by tracking a slow reference, thanks to fluid injection far from the fault, accounting also for the slow dynamics of the fluid’s diffusion.

Anatomy of the Moroccan Middle Class: Characterization and Determinants

This article conducts an in-depth analysis of the Moroccan middle class, addressing the central question: To what extent is the official definition of the middle class in Morocco adapted to the Moroccan context and, to a large extent, to the African context? Utilizing a clustering method that combines economic and sociological approaches, the study reveals the vulnerability and strong heterogeneity of the middle class. Three distinct social fractions emerge: the new middle class, primarily comprised of middle and senior managers and highly educated employees; the marginal middle class, mainly consisting of the unskilled in the informal sector; and the inactive middle class, exclusively composed of inactive and unemployed individuals. While the new middle class embodies typical characteristics of the middle class, a significant portion of this category remains vulnerable to poverty, emphasizing the inadequacy of income as the sole defining factor and highlighting the need to introduce additional dimensions.