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Paleontology provides insights into the history of the planet, from the origins of life billions of years ago to the biotic changes of the Recent. The scope of paleontological research is as vast as it is varied, and the field is constantly evolving. In an effort to identify “Big Questions” in paleontology, experts from around the world came together to build a list of priority questions the field can address in the years ahead. The 89 questions presented herein (grouped within 11 themes) represent contributions from nearly 200 international scientists. These questions touch on common themes including biodiversity drivers and patterns, integrating data types across spatiotemporal scales, applying paleontological data to contemporary biodiversity and climate issues, and effectively utilizing innovative methods and technology for new paleontological insights. In addition to these theoretical questions, discussions touch upon structural concerns within the field, advocating for an increased valuation of specimen-based research, protection of natural heritage sites, and the importance of collections infrastructure, along with a stronger emphasis on human diversity, equity, and inclusion. These questions offer a starting point—an initial nucleus of consensus that paleontologists can expand on—for engaging in discussions, securing funding, advocating for museums, and fostering continued growth in shared research directions.
Increasing interdisciplinary analysis of geoarchaeological records, including sediment and ice cores, permits finer-scale contextual interpretation of the history of anthropogenic environmental impacts. In an interdisciplinary approach to economic history, the authors examine metal pollutants in a sediment core from the Roman metal-producing centre of Aldborough, North Yorkshire, combining this record with textual and archaeological evidence from the region. Finding that fluctuations in pollution correspond with sociopolitical events, pandemics and recorded trends in British metal production c. AD 1100–1700, the authors extend the analysis to earlier periods that lack written records, providing a new post-Roman economic narrative for northern England.
This study aimed to adapt and validate the Mental Health Support Scale (MHSS) for Chile and Argentina, hypothesising that it would correlate positively with mental health literacy, negatively with stigma measures, and differ by mental health first aid (MHFA) training history. The MHSS involves the ‘Intended’ scale (assessing intended support) and the ‘Provided’ scale (evaluating actual help), capturing recommended and not-recommended actions. The scales were translated into Spanish, piloted with 17 adults to explore cultural relevance, and validated with 554 Chilean and Argentinian adults using concurrent measures of stigma, social distance and mental health literacy. Factor analysis of the MHSS-Intended identified a recommended factor (16 items) and a not-recommended factor (5 items). The recommended factor correlated positively with mental health literacy (r = 0.19) and negatively with weak-not-sick stigma (r = −0.16) and social distance (r = −0.16). Support scores significantly discriminated between participants with and without MHFA training (recommended d = 0.99, not-recommended d = 1.35) and within participants pre- and post-MHFA training (recommended d = 0.90, not recommend d = 0.47). Overall, the adapted MHSS demonstrates acceptable psychometric properties and is a promising tool for evaluating mental health first aid support in Chile and Argentina.
Delayed perinatal grief occurs when the grieving process for a lost baby is reactivated after the birth of a healthy child. This case presents a 39-year-old mother who, after losing her first baby at 36 weeks due to Patau syndrome, experienced delayed grief following the birth of a full-term baby two years later. Despite receiving one psychological consultation at the time of the loss, the lack of follow-up contributed to the reactivation of her grief postpartum, presenting with sadness and anxiety.
Objectives
- To describe the process of delayed perinatal grief in a mother who lost a baby due to Patau syndrome.
- To evaluate the psychological impact of the lack of follow-up after the loss on the subsequent development of reactivated grief.
- To propose therapeutic interventions for the management of mothers experiencing delayed perinatal grief.
Methods
We present the case of a 39-year-old mother who lost a baby at 36 weeks of gestation due to Patau syndrome. Following the loss, she received a single psychological consultation with no further follow-up. Two years later, she gave birth to a healthy baby at 40 weeks, and six weeks after delivery, she was referred to psychiatry due to symptoms of profound sadness and anxiety, consistent with delayed perinatal grief. The patient was evaluated by the psychiatry team and began treatment with psychological intervention and pharmacological management when necessary.
Results
The psychiatric intervention led to a gradual improvement in symptoms of sadness and anxiety. The patient responded favorably to psychological treatment, incorporating cognitive-behavioral therapy techniques to manage grief. However, feelings of sadness persisted on dates related to the previous loss. Ongoing emotional support was crucial for the recovery process.
Conclusions
Delayed perinatal grief can reactivate after the birth of a new child, especially in cases where the original loss was not adequately followed up. Proper psychological support is essential to help mothers process their grief and prevent long-term emotional complications.
Electroconvulsive Therapy (ECT) is a proven treatment for treatment-resistant depression (TRD), especially in elderly patients. Managing depression in this population is challenging due to comorbidities and medication intolerance. Research suggests that factors like melancholic features and early symptom improvement predict a positive response to ECT. ECT offers rapid and sustained antidepressant effects.
Objectives
To present the case of a 74-year-old woman with TRD who successfully underwent ECT after failing multiple medications.
Methods
A literature review was conducted on ECT for TRD in elderly patients. The clinical case is detailed, focusing on treatment, ECT application, and outcomes.
Results
The patient had a history of severe depressive episodes. Previous hospitalizations were managed with tricyclic antidepressants, lithium, and olanzapine. However, lithium was discontinued after discharge due to subclinical hypothyroidism and renal function impairment. Although the patient remained stable for a time, her mood progressively worsened, leading to a marked decline in daily functioning and eventual admission to the psychiatric unit. Upon admission, the patient presented with severe depression, including loss of functionality, self-neglect, and passive suicidal ideation, hyporeactive state, significant vegetative symptoms, and moderate-to-severe anxiety. Given the lack of response to a comprehensive pharmacological regimen, ECT was initiated. The patient underwent six sessions of ECT, with initial improvements observed after the first session. By the third session, she showed marked improvements in mood, energy, and anxiety levels. By the end of the ECT course, she had regained full functionality and emotional stability.
Conclusions
This case underscores the effectiveness of ECT in managing psychotic depression in elderly patients when pharmacological treatments are ineffective or poorly tolerated. The patient’s rapid response aligns with previous findings suggesting that early symptom improvement predicts favorable ECT outcomes. Additionally, the presence of melancholic features may have contributed to the success of ECT, as described in the literature. Given the patient’s history of lithium intolerance and multiple pharmacological failures, ECT emerged as the most viable treatment option. ECT also demonstrated long-term benefits.
This case also highlights the importance of considering ECT earlier in the treatment process for elderly patients and demonstrates the crucial role of ECT in achieving rapid and sustained recovery in elderly patients with psychotic depression resistant to pharmacological treatments. Early intervention with ECT was essential for the patient’s full functional recovery, reinforcing its value as a therapeutic option in severe, treatment-resistant cases.
Psychotic depression, a severe subtype of major depressive disorder with delusions or hallucinations, increases suicide risk due to distressing symptoms and hopelessness. Suicide attempts in psychotic depression can be severe and violent. Combining antidepressants and antipsychotics shows promise in reducing suicidal ideation and improving prognosis. This case presents a patient with a severe suicide attempt and self-harm in the context of psychotic depression, highlighting successful treatment with a combination of antidepressants and antipsychotics.
Objectives
To present a case study of a patient with a depressive episode that progressed to psychotic features.
Methods
A comprehensive literature search was conducted to identify relevant studies on the treatment of depression with psychotic features. A case report was then developed, detailing the patient’s clinical presentation, diagnosis, and treatment regimen.
Results
A 53-year-old male was hospitalized following a serious suicide attempt. The patient had a history of a recent work-related accident, leading to a depressive episode that progressed to psychotic features, including delusions of guilt and economic ruin, attempted suicide using a firearm, leading to significant self-inflicted injuries. Emergency surgical intervention was required for tendon and arterial damage. Psychiatrically, the patient exhibited profound hopelessness, delusional guilt, and active suicidal ideation. Following hospital admission, the patient was treated with a combination of sertraline, olanzapine, and mirtazapine, which resulted in significant improvement in mood, a reduction of delusions, and cessation of suicidal ideation over a three-weeks period. The patient returned to social activities and expressed interest in resuming his professional responsibilities, with no recurrence of psychotic symptoms or suicide attempts.
Conclusions
This case illustrates the severity of suicidal behavior in psychotic depression and the critical importance of combining antidepressants with antipsychotics for effective management. Research has consistently shown that psychotic depression carries a heightened risk of severe suicide attempts due to the intensity of delusions and hopelessness. Antidepressant-antipsychotic combinations, particularly those involving selective serotonin reuptake inhibitors (SSRIs) like sertraline, and atypical antipsychotics such as olanzapine, have demonstrated efficacy in reducing both depressive and psychotic symptoms, thereby mitigating suicide risk. In this case, the patient’s marked improvement and remission of psychotic features underscore the role of combined pharmacotherapy in stabilizing mood and preventing future suicidal behavior.
Obsessive-Compulsive Disorder (OCD) during pregnancy can worsen due to hormonal changes, psychological stress, and concerns about the baby’s health. It presents unique challenges for diagnosis and treatment, balancing the mother’s mental health with fetal safety. This case focuses on a woman who developed OCD in her third trimester, emphasizing the challenges in managing the condition.
Objectives
- To describe the impact and progression of OCD during pregnancy.
- To assess the effectiveness of Cognitive Behavioral Therapy (CBT) and evaluate pharmacological options.
- To analyze the risks and benefits of managing OCD therapeutically in pregnant women.
Methods
A clinical case of a 32-year-old woman at 28 weeks of gestation, with newly diagnosed OCD, is presented. Symptoms began in the second trimester with intrusive thoughts about harming her baby and compulsive checking and cleaning behaviors. The patient was treated with CBT, and SSRIs were considered due to symptom severity. Follow-up continued through pregnancy until delivery.
Results
CBT led to a significant reduction in compulsions and improved management of obsessive thoughts. However, moderate symptoms persisted, leading to consideration of SSRIs, which were ultimately avoided due to concerns about side effects. The patient’s delivery was uncomplicated, and continued CBT postpartum resulted in significant improvement.
Conclusions
This case illustrates the complexity of treating OCD during pregnancy, where hormonal changes and concerns about fetal health can exacerbate symptoms. Early intervention with CBT can be effective, and treatment decisions must carefully balance maternal and fetal well-being.
The worldwide prevalence of Wernicke-Korsakoff syndrome is thought to range from 0-2%. Those at greatest risk include the homeless, the elderly, and psychiatric patients (1). In treatment, typical regimens include high doses of intravenous thiamine, three times daily for at least three days. Electrolyte abnormalities should be corrected and fluids replaced.
Objectives
We are interested in studying the evolution of a patient with alcohol withdrawal syndrome progressing to wernicke’s encephalopathy.
Methods
We conducted a literature review by searching for articles in Pubmed.
Results
A 40-year-old male, with no medical or surgical history of interest, alcohol consumer, was admitted to the hospital ICU for an episode of ataxia and agitation in the context of four days of alcohol abstinence. He was sedated and orotracheal intubation was performed and treatment was started with thiamine, tiapride and diazepam. After hemodynamic and respiratory stability, the patient was transferred to the Internal Medicine ward where he presented clinical symptoms compatible with Wernicke’s Encephalopathy (cerebellar ataxia and nystagmus). Psychiatry was consulted to adjust treatment and to carry out a psychosocial approach for discharge (alcohol withdrawal center).
The patient’s evolution has been favorable with the adjustment of psychopharmacological treatment. In the neurological examination we observed nystagmus and cerebellar ataxia. In the psychopathological examination the suspicious contact, psychomotor restlessness, mild generalized tremor in both MMSS are remarkable. Speech difficult to understand due to language barrier. Traits of impulsivity in the foreground. Unstructured biological rhythms. Partial insight. Intellectual functions and volitional abilities preserved.
In the complementary tests without significant remarkable alterations. In the treatment adjustment, a de-escalation of diazepam has been carried out for discharge. Treatment with pregabalin, tiaprizal, thiamine and vitamins B1-B6-B9 was also prescribed. Recommendation of absolute cessation of alcohol consumption and follow-up by internal medicine, psychiatry and social work.
Conclusions
Wernicke-Korsakoff syndrome is a clinical diagnosis and Wernicke’s encephalopathy should be suspected in any person at risk of thiamine deficiency presenting oculomotor findings, ataxia or confusion (1). Thus, in our patient presenting ataxia and nystagmus in the context of alcohol abstinence and some malnutrition, an early approach with thiamine can be performed to prevent progression to Korsakoff’s syndrome.
Once amnesia and executive deficit are present, Korsakoff’s syndrome should be suspected. The key to good outcomes is therefore to detect Wernicke’s encephalopathy early and treat it with thiamine (1). Severe concomitant infections, including sepsis of unknown origin, are frequent during Wernicke’s phase (2). In our patient there were no complications.
Lewy Body Dementia (LBD) is the second most common neurodegenerative disease, after Alzheimer’s disease. Initial neuropsychiatric manifestations such as depression, delusions and hallucinations are frequently observed and sometimes make it difficult to diagnose the neurocognitive disorder underlying the symptoms, so it is important to perform a proper clinical examination, as the use of certain neuroleptics may worsen neurological symptoms.
Objectives
This case aims to investigate the psychiatric clinical features of Lewy body dementia from a clinical and therapeutic perspective.
Methods
A comprehensive search on psychiatric manifestations that may cover up dementia.
Results
71-year-old female with depressive symptoms for the last 8 years. She is admitted to a psychiatric inpatient unit due to worsening of depressive symptoms despite correct adherence to treatment. Her psychiatric history includes a diagnosis of specific phobia, obsessive-compulsive disorder and depressive episodes with inhibitory symptomatology.
During her stay at the hospital, the patient is inhibited, perplexed and experiences feelings of embarrassment and guilt, along with persistent insomnia and poor response to different lines of treatment. Initially, there is notable intolerance to antipsychotics, resulting in worsening of motor and cognitive functions, as well as hypotension, using risperidone and olanzapine. After the withdrawal of treatment, the patient begins to exhibit delusional ideas and visual hallucinations, leading us to consider that she may be suffering from depression associated with an undiagnosed organic brain pathology.
Clinical tests (MoCA,MMSE) reveals cognitive symptoms which, along with the motor symptoms, suggests a Parkinson’s-dementia complex.
A PET-CT scan with fluorodeoxyglucose-F18 reveals severe hypometabolism in the left parietotemporal and prefrontal regions. These findings are consistent with LBD.
Treatment is initiated with rivastigmine and quetiapine. However, due to the presence of hypotension, quetiapine is replaced with clozapine 25 mg, resulting in a slight improvement in rest and affective responses to the psychotic symptoms.
Conclusions
This case illustrates how depression and psychotic symptoms can serve as early indicators of dementia, stemming from the loss of dopaminergic and acetylcholinergic pathways as part of the neurodegenerative process.
These patients may present with a range of cognitive, neuropsychiatric, sleep, motor, and autonomic symptoms. Depression is prevalent in approximately 28% of these patients. Currently, clinicians diagnose LBD based on the presence of core clinical features and indicative biomarkers. Treatment can be complicated by patients’ sensitivity to certain medications, needing careful evaluation of potential side effects. Current guidelines recommend the use of antipsychotics such as quetiapine or clozapine at low doses, as these have a reduced risk of extrapyramidal effects.
Rehospitalization is common in psychosis, often due to poor adherence to antipsychotic treatments. Long-acting injectable antipsychotics (LAIs), particularly paliperidone palmitate 6-month (PP6M), have shown promise in improving adherence and reducing relapses compared to monthly or quarterly formulations . Rapid initiation of PP6M during hospitalization may further optimize post-discharge outcomes and enhance the therapeutic adherence, minimizing the risk of a new outbreak, reducing the impact of rehospitalization and improving patients’ quality of life.
Objectives
To evaluate clinical outcomes and treatment adherence in schizophrenia and other psychotic disorders after rapid PP6M initiation during psychiatric hospitalization.
Methods
A retrospective analysis of 24 hospitalized patients diagnosded with schizophrenia and other psychotic disorders treated with PP6M within 7–10 days was conducted. Treatment adherence, follow-up attendance, and adverse effects were evaluated using McNemar’s test for statistical analysis.
Results
Patients had a mean age of 36.8 years (SD=10.85), 64% were male, with an average of 2 prior hospitalizations (SD=3.16) in the past two years. Previously, 57% were on monthly LAIs. Post-discharge, 83% attended follow-ups. Antipsychotic monotherapy increased by 27% (p = .10) to 59%, while attendance at over 80% of appointments improved by 47% (p ≤ .001). Akathisia was reported in 25% of patients.
Conclusions
PP6M significantly improves adherence by simplifying treatment regimens. Increased follow-up attendance (47%) and greater use of monotherapy reflect better patient outcomes. These findings align with prior evidence on the efficacy of LAIs in preventing relapses. Rapid initiation of PP6M can reduce rehospitalizations and optimize hospital resources. The low incidence of akathisia (25%) supports its safety and tolerability for long-term use.
Ekbom’s syndrome is a clinical term for delusional parasitosis, a condition characterized by the belief that one’s skin is infested by invisible parasites. Delusional infestation is a rare psychiatric disorder, is more common in the elderly, particularly in postmenopausal females. Psychiatric interventions are usually rejected by these patients and long-term treatments are frequently abandoned, they usually seek care from dermatologists. It is advocated to form a liaison between dermatology and psychiatry to ensure a full range of differential diagnoses, in order to form the most suitable management plan.
Objectives
The objetive of this case is to illustrate the severity of Ekbom’s syndrome, providing detailed clinical information and highlighting the challenges in treatment.
Methods
The following patient will be presented, doing a thorough systematic bibliography review.
Results
A 54-year-old female patient describes a clinical history of three years of visual hallucinations and generalized pruritus since a family weekend at a countryside house. She reported that, for the past three years, she has experienced itching all over her body and has occasionally seen “bugs” on her body that she believes to be fleas. She mentioned having been diagnosed with “scabies” and “seborrheic dermatitis”.Despite these diagnoses, her father noted that for the past year, the patient has been extremely anxious, spending hours examining her hair and skin, washing repeatedly, and searching for “bugs.” In recent weeks, she refused to eat.Throughout her stay in the unit attended therapy regularly, and participated actively. A psychopharmacological adjustment was made, starting with Abilify at 15 mg/day, which was well-tolerated and effective. A dermatology consult ruled out dermatological pathology. Over the days, a reduction in anxiety and partial improvement in somatic complaints were observed. As the patient’s condition improved, she committed to continuing with the treatment and attending mental health team consultations with her referring psychiatrist.
Conclusions
Delusional infestation is a serious and uncommon disorder that endangers the patients and the people around them, and can be complicated with secondary somatic complications, often requiring involvement of different medical specialists.The treatment is long and complicated, the effectiveness of pimozide, aripiprazol or risperidone for the Ekbom syndrome has been documented in the literature. In our case, we decided to introduce aripiprazol. The management of these patients requires a multidisciplinary approach between dermatologists and psychiatrists, as they often refuse treatment. Consultation and collaboration between both specialties are essential to ensure timely referral. Additionally, it is crucial for general physicians to have greater awareness of these conditions, perform early recognition, maintain good rapport with patients, and provide empathetic treatment.
We present the serendipitous radio-continuum discovery of a likely Galactic supernova remnant (SNR) G305.4–2.2. This object displays a remarkable circular symmetry in shape, making it one of the most circular Galactic SNRs known. Nicknamed Teleios due to its symmetry, it was detected in the new Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe (EMU) radio–continuum images with an angular size of 1 320$^{\prime\prime}$$\times$1 260$^{\prime\prime}$ and PA = 0$^\circ$. While there is a hint of possible H$\alpha$ and gamma-ray emission, Teleios is exclusively seen at radio–continuum frequencies. Interestingly, Teleios is not only almost perfectly symmetric, but it also has one of the lowest surface brightnesses discovered among Galactic SNRs and a steep spectral index of $\alpha$=–0.6$\pm$0.3. Our best estimates from Hi studies and the $\Sigma$–D relation place Teleios as a type Ia SNR at a distance of either $\sim$2.2 kpc (near-side) or $\sim$7.7 kpc (far-side). This indicates two possible scenarios, either a young (under 1 000 yr) or a somewhat older SNR (over 10 000 yr). With a corresponding diameter of 14/48 pc, our evolutionary studies place Teleios at the either early or late Sedov phase, depending on the distance/diameter estimate. However, our modelling also predicts X-ray emission, which we do not see in the present generation of eROSITA images. We also explored a type Iax explosion scenario that would point to a much closer distance of $\lt$1 kpc and Teleios size of only $\sim$3.3 pc, which would be similar to the only known type Iax remnant SN1181. Unfortunately, all examined scenarios have their challenges, and no definitive Supernova (SN) origin type can be established at this stage. Remarkably, Teleios has retained its symmetrical shape as it aged even to such a diameter, suggesting expansion into a rarefied and isotropic ambient medium. The low radio surface brightness and the lack of pronounced polarisation can be explained by a high level of ambient rotation measure (RM), with the largest RM being observed at Teleios’s centre.
Understanding how to increase government revenue via taxation is a core puzzle in state development. Taxation is critical for states to fund public goods, and may have positive spillover effects on citizen-state relations. We argue that tax compliance will be higher when governments employ community-level, rather than individual-level, interventions. To test whether it is more effective to focus such interventions on top-down (TD) enforcement or bottom-up (BU) quasi-voluntary compliance, we ran a multi-arm field experiment in 128 markets in Malawi. We find that the BU intervention significantly increased tax compliance by 40%. The TD intervention had a less robust effect on compliance, although not significantly different from that in the BU group. The BU intervention, but not the TD, also increased trust in government, satisfaction with services, and political engagement. The results show that community-level tax interventions can increase compliance and that quasi-voluntary approaches can positively reshape citizen-state relations.
Two uranyl carbonate silicate minerals have been studied in detail, lepersonnite-(Gd) and the new mineral lepersonnite-(Nd). Both minerals originate from Katanga province in the Democratic Republic of Congo (Africa): lepersonnite-(Gd) from the Shinkolobwe mine (type locality) and lepersonnite-(Nd) from the Swambo mine (type locality) and Shinkolobwe mine. Each occurs as radial to acicular aggregates composed of long prismatic, thin crystals, as the products of hydration–oxidation weathering of uraninite. A detailed description of the chemical and physical properties of lepersonnite-(Nd) is provided, including the thermal analysis of the -(Gd) member. Moreover, Raman and infrared spectroscopy data are provided for both minerals. The crystal structure of lepersonnite-(Gd) has been solved based on 3D electron diffraction data. According to the best dataset at 95 K, lepersonnite-(Gd) is orthorhombic, with a = 11.838(134) Å, b = 15.822(333) Å, c = 39.147(190) Å and V = 7353(282) Å3 (Z = 4). The dynamic refinement of the crystal structure (Robs/wRobs = 0.1204/0.1088 and Rall/wRall = 0.1204/0.1088 for 3090/50507 observed/all reflections and 247 refined parameters) revealed a large complex sheet structure with structural units defining a new lepersonnite topology. It contains infinite sheets of uranyl polyhedra, planar CO3 groups, protonated Si-tetrahedra, and Gd3+ polyhedra, and a thick interlayer hosted with H2O and partially occupied Ca2+ sites. Based on the structure refinement, bond-valence considerations, and new electron microprobe data, we infer that the ideal formula of lepersonnite-(Gd) is [Ca0.5Gd0.5(H2O)18(OH)1.5] [Gd(UO2)12(SiO3OH)2(CO3)4(OH)10O2(H2O)5]. On the basis of their closely related powder X-ray diffraction patterns and the similar behaviour of Nd and Gd, we expect the two minerals to adopt the same structures, apart from Ca, which was absent in lepersonnite-(Nd). The ideal formula for lepersonnite-(Nd) is [Nd(H2O)18(OH)2][Nd(UO2)12(SiO3OH)2(CO3)4(OH)10O2(H2O)5].
“Personality” is considered as a set of individual characteristics and behavioral dispositions based on both temperamental (partially genetic-driven) and developmental (partially culture-driven) components that are relatively stable across time and context. We suggest that these two intertwined components progressively shape autopoietic processes operating at an individual and a social level in accordance with the theory of evolution and its application to human behavior. We discuss existing evidence linking personality traits to the manifestations of personality disorders and diverse forms of psychopathology. Particular attention is dedicated to the evolutionary concept referred to as Life History Theory, considering its utility in predicting the development of personality traits. We also emphasize the need to explore sources of critique and further research, suggesting that a multifaceted approach to the understanding of personality dimensions is crucial.
The First Large Absorption Survey in H i (FLASH) is a large-area radio survey for neutral hydrogen in and around galaxies in the intermediate redshift range $0.4\lt z\lt1.0$, using the 21-cm H i absorption line as a probe of cold neutral gas. The survey uses the ASKAP radio telescope and will cover 24,000 deg$^2$ of sky over the next five years. FLASH breaks new ground in two ways – it is the first large H i absorption survey to be carried out without any optical preselection of targets, and we use an automated Bayesian line-finding tool to search through large datasets and assign a statistical significance to potential line detections. Two Pilot Surveys, covering around 3000 deg$^2$ of sky, were carried out in 2019-22 to test and verify the strategy for the full FLASH survey. The processed data products from these Pilot Surveys (spectral-line cubes, continuum images, and catalogues) are public and available online. In this paper, we describe the FLASH spectral-line and continuum data products and discuss the quality of the H i spectra and the completeness of our automated line search. Finally, we present a set of 30 new H i absorption lines that were robustly detected in the Pilot Surveys, almost doubling the number of known H i absorption systems at $0.4\lt z\lt1$. The detected lines span a wide range in H i optical depth, including three lines with a peak optical depth $\tau\gt1$, and appear to be a mixture of intervening and associated systems. Interestingly, around two-thirds of the lines found in this untargeted sample are detected against sources with a peaked-spectrum radio continuum, which are only a minor (5–20%) fraction of the overall radio-source population. The detection rate for H i absorption lines in the Pilot Surveys (0.3 to 0.5 lines per 40 deg$^2$ ASKAP field) is a factor of two below the expected value. One possible reason for this is the presence of a range of spectral-line artefacts in the Pilot Survey data that have now been mitigated and are not expected to recur in the full FLASH survey. A future paper in this series will discuss the host galaxies of the H i absorption systems identified here.
We present the Evolutionary Map of the Universe (EMU) survey conducted with the Australian Square Kilometre Array Pathfinder (ASKAP). EMU aims to deliver the touchstone radio atlas of the southern hemisphere. We introduce EMU and review its science drivers and key science goals, updated and tailored to the current ASKAP five-year survey plan. The development of the survey strategy and planned sky coverage is presented, along with the operational aspects of the survey and associated data analysis, together with a selection of diagnostics demonstrating the imaging quality and data characteristics. We give a general description of the value-added data pipeline and data products before concluding with a discussion of links to other surveys and projects and an outline of EMU’s legacy value.
We investigate the stability of a compressible boundary layer over an impedance wall for both constant impedances and a frequency-dependent porous wall model. For an exponential mean flow profile, the solution of the Pridmore-Brown equation, i.e. the linearised Euler equations for compressible shear flows, is expressed exactly in confluent Heun functions and, with the boundary condition of acoustic wall impedance, reduced to a single algebraic eigenvalue equation. This, in turn, is solved asymptotically and numerically and provides the complete inviscid eigenvalue spectrum without spurious modes. The key finding is that impedance walls not only have a desirable stabilising effect on inviscid disturbances, but also induce new instabilities. The type of the destabilised mode and therefore also the direction of propagation of the modes with maximum growth rate as well as the destabilised wavenumbers depend significantly on the porous wall properties, in particular on the porous wall layer thickness. For small porous layer thicknesses, the impedance-induced instability is observed as a second mode instability, where we find above a critical porosity growth rates exceeding those present in the rigid-wall case.
We introduce the “ball-catching task”, a novel computerized task, which combines a tangible action (“catching balls”) with induced material cost of effort. The central feature of the ball-catching task is that it allows researchers to manipulate the cost of effort function as well as the production function, which permits quantitative predictions on effort provision. In an experiment with piece-rate incentives we find that the comparative static and the point predictions on effort provision are remarkably accurate. We also present experimental findings from three classic experiments, namely, team production, gift exchange and tournament, using the task. All of the results are closely in line with the stylized facts from experiments using purely induced values. We conclude that the ball-catching task combines the advantages of real effort tasks with the use of induced values, which is useful for theory-testing purposes as well as for applications.
We study distributional preferences in adolescent peer networks. Using incentivized choices between allocations for themselves and a passive agent, children are classified into efficiency-loving, inequality-loving, inequality-averse, and spiteful types. We find that pairs of students who report a friendship link are more likely to exhibit the same preference type than other students who attend the same school. The relation between types is almost completely driven by inequality-loving and spiteful types. The role of peer networks in explaining distributional preferences goes beyond network composition effects. A low rank in academic performance and a central position within the network relate positively to a higher likelihood of being classified as spiteful. Hence, social hierarchies seem to be correlated with distributional preference types.