Conventional wisdom holds that open, collaborative, and transparent organizations are innovative. But some of the most radical innovations—satellites, lithium-iodine batteries, the internet—were conceived by small, secretive teams in national security agencies. Are these organizations more innovative because of their secrecy, or in spite of it? We study a principal–agent model of public-sector innovation. We give research teams a secret option and a public option during the initial testing and prototyping phase. Secrecy helps advance high-risk, high-reward projects through the early phase via a cost-passing mechanism. In open institutions, managers will not approve pilot research into high-risk, high-reward ideas for fear of political costs. Researchers exploit secrecy to conduct pilot research at a higher personal cost to generate evidence that their project is viable and win their manager's approval. Contrary to standard principal–agent findings, we show that researchers may exploit secrecy even if their preferences are perfectly aligned with their manager's, and that managers do not monitor researchers even if monitoring is costless and perfect. We illustrate our theory with two cases from the early Cold War: the CIA's attempt to master mind control (MKULTRA) and the origins of the reconnaissance satellite (CORONA). We contribute to the political application of principal–agent theory and studies of national security innovation, emerging technologies, democratic oversight, the Sino–American technology debate, and great power competition.

We describe an outbreak of delta variant SARS-CoV-2 on a psychogeriatric ward of elderly patients. Retrospectively collected data was analysed using Fisher's exact test to assess the association between patients’ vaccination status and infection rates, severity of disease and mortality. Vaccination with two doses was shown to reduce severity of disease (5% vs. 75%, p < 0.001) and mortality (5% vs. 50%, p < 0.018) amongst an elderly inpatient population during an outbreak of delta variant SARS-CoV-2. Vaccination should be encouraged in elderly care institutions. Furthermore, adequate vaccination in elderly care institutions is an important consideration in current booster (third/fourth) dose schedules.

Over the past 25 years, CORONA satellite imagery has become an integral part of archaeological research, especially for arid, sparsely vegetated regions such as the Middle East. Since 2020, a new archive of satellite imagery gathered by the US spy satellite programme that succeeded CORONA—HEXAGON—has become widely available for download via the United States Geological Survey. This photographic archive has enormous potential for archaeological research. Here, the authors seek to lower the barriers to accessing and using this imagery by detailing the background, technical specifications and history of the HEXAGON archive. Four case studies illustrate the benefits and limitations of HEXAGON imagery for archaeological and historical research in the Middle East and beyond.

Is there such a thing as corona solidarity? Does voluntary mutual aid solve the problems caused by COVID-19? I argue that the answer to the first question is “yes” and to the second “no.” Not that the answer to the second question could not, in an ideal world, be “yes,” too. It is just that in this world of global capitalism and everybody looking out for themselves, the kind of communal warmth celebrated by the media either does not actually exist or is too weak to rule out the uglier manifestations of group togetherness, driven partly by the pandemic. I make my point by offering two approaches to understanding what solidarity is. According to the first, it is essentially partiality: “us” against “them.” According to the second, it can be many things, including the impartial promotion of the good of others. I show that the second reading would make it possible for mutual aid to solve the problems caused by COVID-19 and other crises. This would happen at the expense of conceptual clarity, but that is a minor concern. The major concern is that the more natural manifestations of group togetherness are incited by negative feelings. This is par for the course within the narrower reading of solidarity, but it means that the potentially positive ideas of identity, care, communal values, and special relations are displayed in violent confrontation instead of a calm recognition of the threats that most of us face together.

The coronavirus disease 2019 (COVID-19) pandemic may cause psychological distress in the general population and has the potential to cause anxiety regarding COVID-19. No validated questionnaires exist for the measurement of specific COVID-19 anxiety. We modified the DSM 5 – Severity Measure for Specific Phobia–Adult scale specifically for anxiety regarding COVID-19, and report the psychometric properties from an online study with 6262 participants from the general population in Germany. We analysed internal consistency as well as concordant validity. The scale showed good internal consistency (α = 0.86) and good concordant validity (rs = 0.60) with the 2-item Generalized Anxiety Disorder measure and rs = 0.61 with self-rating of limitations in daily life caused by COVID-19 anxiety.

The Covid-19 pandemic has caused unseen socio-economic changes all over the world, where enormous efforts are being made to preserve lives and maintain functional health systems. A secondary concern is to mitigate the severe economic consequences of the crisis. Different approaches have been adopted with varying outcomes and experiences. But regardless of the different approaches taken, one thing is common for all societies during this pandemic: fear and anxiety. This fear extends from concerns about the present situation, for the health and well-being of family members and loved ones from Covid-19 infection, to fears relating to how long the crisis will last, to the potential economic consequences of the pandemic (perhaps not seen in our lifetimes) and the ultimate fear of future uncertainty. Across the world, health systems are being faced with unprecedented challenges. At their core, these challenges are the same: how to beat Covid-19. Certainly, there are differences in how individual systems are organized and how they address the main issues arising from the pandemic while not forgetting the ongoing healthcare needs of the general population. In this paper, we share some perspectives from Croatia regarding Child and Adolescent Mental Health services (CAMHs) in these extraordinary circumstances. We give our personal insights on deficiencies in Child and Adolescent Mental Health Services prior to the arrival of Covid-19, which have contributed to difficulties in mitigating and managing the ongoing crisis.

Throughout the Hubble time, gas makes its way from the intergalactic medium into galaxies fuelling their star formation and promoting their growth. One of the key properties of the accreting gas is its angular momentum, which has profound implications for the evolution of, in particular, disc galaxies. Here, we discuss how to infer the angular momentum of the accreting gas using observations of present-day galaxy discs. We first summarize evidence for ongoing inside-out growth of star forming discs. We then focus on the chemistry of the discs and show how the observed metallicity gradients can be explained if gas accretes onto a disc rotating with a velocity 20 – 30% lower than the local circular speed. We also show that these gradients are incompatible with accretion occurring at the edge of the discs and flowing radially inward. Finally, we investigate gas accretion from a hot corona with a cosmological angular momentum distribution and describe how simple models of rotating coronae guarantee the inside-out growth of disc galaxies.

Reaction textures including corona structures in granulites from the Proterozoic Long Range Inlier of western Newfoundland are spatially associated with a Silurian (0.34 Ga) mafic intrusion, the Taylor Brook Gabbro Complex. They comprise, in metabasites and tonalitic gneiss, coronal orthopyroxene and plagioclase on garnet and, in metapelites, cordierite and spinel formed at the expense of sillimanite, garnet and quartz. Although generally interpreted to indicate near-isothermal decompression (ITD) following regional metamorphism, which in the inlier occurred at ˜1.10–1.03 Ga, these features appear to be absent elsewhere. Therefore they are interpreted to be products of contact metamorphism (near-isobaric heating – IBH) within the thermal aureole of the gabbro. Thus, there is a ˜0.7 Ga difference (i.e. mid-Proterozoic vs. mid-Silurian) between the age of the regional metamorphic mineral assemblages and the contact aureole assemblages. The observation that classic ITD features occur in this aureole environment underscores the fact that P-sensitive reactions can progress during IBH as well as by pressure release.

Olivine-plagioclase corona textures occur in ophitic to sub-ophitic olivine gabbros at Black Hill, South Australia. Contrasting with many corona and symplectite textures previously described, these do not involve spinel or garnet as reaction products and did not form under high-pressure conditions. Rather, the coronas formed at no more than 1 kbar pressure and are composed of a shell of orthopyroxene around the olivine often succeeded by a shell of amphibole or occasionally biotite. Beyond this, a vermicular symplectite of anorthite containing orthopyroxene and rarer amphibole vermicules extends out to host plagioclase of labradorite composition. Textural relations are used to infer a subsolidus igneous origin for all but the orthopyroxene shell which may have formed in the presence of some magma. Compositional zonation is absent from all the constituent phases except the amphibole shell which is strongly zoned in Mg# and may have a late origin. An average maximum corona width of 150- 200 μm indicates a limiting distance for subsolidus chemical diffusion. The corona products involve the reactants olivine and plagioclase in the proportions 1:3 and symplectite formation may have been promoted by a Na potential gradient. The system must also have been open to minor components including H2O and TiO2, with H2O possibly being derived from a hydrothermal system. Such systems may have been set up in the country rocks on intrusion of the magma and subsequently collapsed inwards into the pluton during sub-solidus cooling.

The particular environment with high temperature and low plasma density in the corona results to the formation of some forbidden emission lines, in which the well-known green line at 530.3 nm has been utilized to diagnose the corona for a few decades. For the green line, besides its contribution on revealing the long-term coronal cycles as well as their relationship to the other solar phenomena, it is also helpful to detect limb coronal waves and ejections originated from the lower corona which seems not to be paid close attention to. Suggestions are presented that we not only need to keep the green line observation as a routine task for current coronagraph observations, but need to develop larger coronagraphs with advanced technology.

An onboard automated coronal mass ejections (CMEs) detection algorithm has been developed for Visible Emission Line Coronagraph (VELC) onboard ADITYA-L1. The aim of this algorithm is to reduce the load on telemetry by sending the high spatial (~ 2.51 arcsec pixel−1) and temporal (1 s) resolution images of corona from 1.05 R⊙ to 3 R⊙, containing CMEs and rejecting others. It is based on intensity thresholding followed by an area thresholding in successive running difference images which are re-binned to lower resolution to improve signal to noise. Here we present the results of application of the algorithm on synthetic corona images generated for the VELC field of view (FOV).

The coronal is the origins of large-scale solar activity and disastrous space weather, it contains extremely rich information and various physical processes. The coronal loop is a kind of bright structure with hot plasma which is bounded by magnetic field in the coronal, it is a good reflection of the magnetic structure that we can hardly observe directly. It is also the energy channel between the photosphere and coronal, and the study of coronal loop is helpful for us to understand the magnetic line foot movement.

Impulsive solar energetic particle (SEP) events originate from the energy dissipation process in small solar flares. Anomalous abundances in impulsive SEP events provide an evidence on unique, yet unclear, acceleration mechanism. The pattern of heavy-ion enhancements indicates that the temperature of the source plasma that is accelerated is low and not flare-like. We examine the solar source of the 3He-rich SEP event of 2012 November 20 using Solar Dynamics Observatory (SDO)/ Atmospheric Imaging Assembly (AIA) images and investigate its thermal variation. The examined event is associated with recurrent coronal jets. The Differential Emission Measure (DEM) analysis is applied to study the temperature evolution/distribution of the source regions. Preliminary results show that the temperature of the associated solar source is ranged between 1.2-3.1 MK.

The density and temperature profiles in the solar corona are complex to describe, the observational diagnostics is not easy. Here we present a physics-based model to reconstruct the evolution of the electron density and temperature in the solar corona based on the configuration of the magnetic field imprinted on the solar surface. The structure of the coronal magnetic field is estimated from Potential Field Source Surface (PFSS) based on magnetic field from both observational synoptic charts and a magnetic flux transport model. We use an emission model based on the ionization equilibrium and coronal abundances from CHIANTI atomic database 8.0. The preliminary results are discussed in details.