Geometric convergence results for closed minimal surfaces via bubbling analysis

We present some geometric applications, of global character, of the bubbling analysis developed by Buzano and Sharp for closed minimal surfaces, obtaining smooth multiplicity one convergence results under upper bounds on the Morse index and suitable lower bounds on either the genus or the area. For instance, we show that given any Riemannian metric of positive scalar curvature on the three-dimensional sphere the class of embedded minimal surfaces of index one and genus $$\gamma $$ γ is sequentially compact for any $$\gamma \ge 1$$ γ ≥ 1 . Furthemore, we give a quantitative description of how the genus drops as a sequence of minimal surfaces converges smoothly, with mutiplicity $$m\ge 1$$ m ≥ 1 , away from finitely many points where curvature concentration may happen. This result exploits a sharp estimate on the multiplicity of convergence in terms of the number of ends of the bubbles that appear in the process.

Hot topics: Denial-of-Service attacks on news websites in autocracies

Most authoritarian countries censor the press. As a response, many opposition and independent news outlets have found refuge on the Internet. Despite the global character of the Internet, news outlets are vulnerable to censorship in cyberspace. This study investigates Denial-of-Service (DoS) attacks on news websites in Venezuela and details how news reporting is related to DoS attacks in an attempt to censor content. For this empirical test, I monitored 19 Venezuelan news websites from November 2017 until June 2018 and continuously retrieved their content and status codes to infer DoS attacks. Statistical analyses show that news content correlates to DoS attacks. In the Venezuelan context, these news topics appear to be not only on protest and repression but also on opposition actors or other topics that question the legitimacy of the regime. By establishing these relationships, this study deepens our understanding of how modern technologies are used as censorship tools.

Coronomics, Financial support for the Economy and its Zombie-ing (In the Context of the Fifth Factor of Production)

The paper examines the impact of the COVID-19 pandemic on the economy and the corresponding atypical economic crisis, the role of the economic ability of the government during this crisis, aspects of financial support for the economy and the peculiarities of the zombie economy. The aim of the study is to research the actions of the economic ability of the government as an independent factor of production in the context of the COVID-19 pandemic, contributing to the unfolding of the process of zombie-ing the economy. The research uses the methods of deduction and induction, analysis and synthesis, analogy and abstraction. The special functions of the government are considered within the context of the economic crisis caused by the COVID-19 pandemic; particularly, we refer to the recognition of the fifth factor of production of the economic ability of the government. The main features of this atypical crisis are characterized. It is shown that the process of deglobalization during the COVID-19 pandemic characterizes the deglobalization of the economic ability of the government and that this process is temporary, since overcoming the global phenomenon of the pandemic and the economic crisis caused by it requires exclusively global efforts and measures. Particular attention is focused on the financial support of the economy from the economic ability of the government within the context of this economic crisis. The conclusion is that this support contributes to the process of zombie-ing the economy which took on a global character during the global financial and economic crisis of 2007–2009 and continued after its completion. Zombie-ing the economy is the result of a conflict between the political interests of the government and its economic ability when the latter is not able to overcome the barrier created by the former. A solution to this problem is possible through changes in bankruptcy legislation when its main principle of avoiding the unwanted bankruptcy of firms will be replaced by the principle of liquidation of unviable firms. Such a change in bankruptcy legislation can be implemented only during the economic upswing.

Exposure to COVID-19 is associated with increased altruism, particularly at the local level

Theory posits that situations of existential threat will enhance prosociality in general and particularly toward others perceived as belonging to the same group as the individual (parochial altruism). Yet, the global character of the COVID-19 pandemic may blur boundaries between ingroups and outgroups and engage altruism at a broader level. In an online experiment, participants from the U.S. and Italy chose whether to allocate a monetary bonus to a charity active in COVID-19 relief efforts at the local, national, or international level. The purpose was to address two important questions about charitable giving in this context: first, what influences the propensity to give, and second, how is charitable giving distributed across different levels of collective welfare? We found that personal exposure to COVID-19 increased donations relative to those not exposed, even as levels of environmental exposure (numbers of cases locally) had no effect. With respect to targets of giving, we found that donors predominantly benefitted the local level; donations toward country and world levels were half as large. Social identity was found to influence charity choice in both countries, although an experimental manipulation of identity salience did not have any direct effect.

Signs of a new geomagnetic jerk between 2019 and 2020 from Swarm and observatory data

Following the observed pattern of a new geomagnetic jerk every 3–4 years, certain predictions suggested that a new event should occur around 2020 after the one observed around 2017.5. In this work, we explore this scenario by analysing the secular variation of the East geomagnetic field component in both ground and satellite geomagnetic data. At ground, we use the available data from 2015 to 2021 in 10 observatories worldwide distributed. This analysis shows the occurrence of the mentioned jerk in mid-2017 at observatories located in the Pacific region, but also reveals a new jerk between mid-2019 and early 2020 with a clear global character. Swarm satellite data also corroborate these findings by means of the secular variation estimated using virtual observatories at 440 km altitude. In addition, a general view using the most recent CHAOS geomagnetic model confirms the global character of the 2020-jerk with V-shaped secular variation changes in meridional sectors covering the Eastern Pacific, America, Asia and the Indian Ocean; and Λ-shapes in Europe, Africa and Western Pacific. The radial geomagnetic field at the core–mantle boundary is investigated as the origin of the new jerk. Results show that the global-average secular acceleration of the radial field exhibits a new pulse at mid-2018, establishing the starting epoch of the 2020-jerk.

X-ray computed tomography for non-invasive dendrochronology reveals a concealed double panelling on a painting from Rubens’ studio

Dating the wood from historical art objects is a crucial step to ascertain their production time, and support or refute attribution to an artist or a workshop. Dendrochronology is commonly used for this purpose but requires access to the tree-ring pattern in the wood, which can be hindered by preparatory layers, polychromy, wax, or integrated frames. Here we implemented non-invasive dendrochronology based on X-ray computed tomography (CT) to examine a painting on panel attributed to Rubens’ studio and its presumed dating around 1636 CE. The CT images achieved a resolution of 37.3 micron and revealed a double panelling, which was concealed by oak strips covering all four edges. The back (visible) board is made of deciduous oak (Quercus subg. Quercus), the most common type of wood used in 17th-century Netherlandish workshops, and was dated terminus post quem after 1557 CE. However, the front (original) board used for the painting has been identified through examination of the wood anatomy as a tropical wood, probably Swietenia sp., a species seldom used in Netherlandish paintings, and remains undated. Its very presence attests the global character of 17th-century trade, and demonstrates the use of exotic species in Flemish studios. The date of the oak board refutes previous results and suggests that this board was trimmed to meet the size of the tropical one, having been glued to it for conservation purposes or with deceiving intentions to pretend that the painting was made on an oak panel. These revelations have opened new lines of art historical inquiry and highlight the potential of X-ray CT as a powerful tool for non-invasive study of historical art objects to retrieve their full history.

Platform workers in Latin America: transnational logics and regional resistances?

The platforms boom in Latin America is at the current core of the industrial and retail sectors. Platform workers (i.e., drivers, motorcyclists and bikers) started organizing along different repertoires taken from other countries thanks to the global character of productive processes and the weight of migrant labor in services, such as mail, post services, and mobility of people. From a qualitative approach, this article proposes an overview of main organizing experiences and burgeoning struggles in this new context aggravated by the intensification of such platforms within the Covid-19 crisis.

Исследования Pоссии/СССР и стран Восточной Европы после холодной войны: новое лицо дисциплины

The paper deals with the new developments in the field of Russian and East European studies (REES) after the end of the Cold war, with the focus on the U.S. and Great Britain. Along with organizational and structural changes in the field special attention is devoted to new subjects and trends in the study of the region, with Belarus as a case study. Research in this field began in the 90s and has been booming since the 2000s. Researchers are primarily interested in the history of the country, political science, anthropology, and literary studies. The formation of an international community of researchers allows us to conclude that previously “Western” discipline of REES is gaining a global character.

Implementation of General Sustainability Objectives as Tools to Improve the Environmental Performance of Industry

This article examines the implementation of the Swedish national environmental quality objectives and discusses what can be learned for the equivalent process for the set of global UN 2030 goals (SDGs), established in 2015. The empirical basis is a study on 50 large companies in Sweden and their use of these objectives in their policy formulation. The SDGs are crafted with a broader approach than the Swedish national environmental quality objectives. Therefore, the SDGs probably better reflect the agenda of the business community since they have a global character, cover the whole spectrum of important sustainability issues and provide a mutual agenda for the business community worldwide. More than 90 percent of the large companies in the study have explicitly committed themselves to the SDGs, only 1–2 years after they were published, whereas similar commitments hardly exist for the national environmental quality objectives, even 20 years after its establishment. A large majority of the large companies in this study know about the SDGs, have actively endorsed them, and started to adjust their activities accordingly. In the end, the results of these endorsements remain to be seen.