Over the past decade, the field of digital open-source investigations has both expanded and matured. Open source investigations rely on information that anyone can access from the Internet, and have been increasingly deployed by legal investigators, human rights researchers, and journalists. The investigatory methods include Boolean searches; sourcing videos, photographs, and other data from social media; determining locations of events by comparing photos and videos to satellite images; mining the deep web for government records; determining time of day by analyzing shadows in photos; and more. In this essay, I argue that digital open-source investigators can (and should) rely on a three-step process when faced with an investigations-related dilemma: (1) identifying what the law says they can or cannot do according to their professional identity, intended purpose, and relevant jurisdiction; (2) soliciting guidance from their professional code of ethics (if they have one); and (3) weighing their options against the values of safety, accuracy, and dignity. Given space constraints and prior coverage of the first two steps, I focus here on step three. The values of safety, accuracy, and dignity arguably apply to all open-source investigations and investigators, regardless of jurisdiction or professional identity, and their application reflects a relatively novel attempt to help set ethics-based boundaries around investigation-related activities.

This article investigates the solidarity campaigns supporting refugees from the Greek Civil War (1946–1949) in post-war Czechoslovakia and the emerging German Democratic Republic. Framed as an important bridge between the interwar and later Cold War forms of socialist internationalism, this case sheds light on its transitory character, revealing the narrative shift from anti-fascist to anti-imperialist contexts and the increasingly institutionalized and ritualized solidarity. Thus, not only was practising solidarity already an integral part of post-war socialist regimes, but it also served a variety of functions, contributing to the legitimization and identity of the Eastern bloc. Based on archival documents and press, the article uncovers the deployment of analogical institutional structures employed by both states, thus opening up the sphere of interaction with their citizens, mobilized to become involved in various ways. The two countries, however, departed from different positions, dealing with opposing legacies of the wartime experience, which influenced the motivations employed in their campaigns. Entangled in discourses of guilt, heroism, and victimhood, yet aligned under the proclaimed values of socialist brotherhood and anti-fascism, building internationalist solidarity in both countries worked alongside and even boosted attempts to overcome the obstacle of the Nazi past, both internally and in their mutual relationship. This article thus contributes to a better understanding of how internationalist solidarity functioned as a platform to build bridges – not only towards the “South”, but also within the Eastern bloc.

In this paper, we consider random iterations of polynomial maps $z^{2} + c_{n}$, where $c_{n}$ are complex-valued independent random variables following the uniform distribution on the closed disk with center c and radius r. The aim of this paper is twofold. First, we study the (dis)connectedness of random Julia sets. Here, we reveal the relationships between the bifurcation radius and connectedness of random Julia sets. Second, we investigate the bifurcation of our random iterations and give quantitative estimates of bifurcation parameters. In particular, we prove that for the central parameter $c = -1$, almost every random Julia set is totally disconnected with much smaller radial parameters r than expected. We also introduce several open questions worth discussing.

In this study, the effects of two different ammonium-exchange methods to improve the ammonia (NH3) gas adsorption of raw clinoptilolite (CLN) from Gördes (Türkiye) was investigated. The first method involved direct modification of CLN by 0.5 or 1.0 M NH4NO3 solutions at 80°C for 4 and 8 h followed by calcination. In the second method, CLN was converted to the Na+ form prior to modification with ammonium nitrate and calcination under the same conditions. Both methods yielded H+ forms of CLN through the removal of exchangeable cations without damaging the crystal structure. Ammonia adsorption isotherms were determined at 298 K for a total of eight different H+ forms synthetized using both methods. The Na-1.0-8h CLN sample with the highest NH3 adsorption capacity obtained using the second method was selected as the parent CLN. In addition, to determine the effects of doping different cations into the structure on the NH3 adsorption properties of the selected parent CLN sample, cation-exchange processes were carried out using 0.5 and 1.0 M NaNO3, KNO3, Ca(NO3)2 and Mg(NO3)2 solutions at 80°C for 4 h. The raw and modified CLNs were characterized using X-ray diffraction, X-ray fluorescence, scanning electron microscopy and N2 adsorption analyses. Cation-exchanged samples with a wide range of NH3 adsorption capacities (3.61–4.93 mmol g–1) were compared with other zeolites from the literature.

La cifra de desaparecidos en Argentina motiva debates recurrentes. Durante la última dictadura militar (1976–1983) sus denunciantes elaboraron diversas cifras y estimaciones pero el número de 30 mil desaparecidos adquirió un carácter canónico. Tras retornar la democracia, la Comisión Nacional sobre la Desaparición de Personas registró 8.960 casos. En los años noventa, en un contexto de impunidad, grupos de la sociedad civil elaboraron sus propias cifras y en los dos mil el Estado ofreció nuevos registros. El resurgimiento del negacionismo y la relativización del crimen revitalizaron este debate. Este trabajo historiza las cifras de desaparecidos y víctimas de desaparición forzada elaboradas por diversos actores y propone una aproximación académica sobre el tema. Comprende a estas cifras en su doble dimensión: como fruto de la elaboración de conocimiento sobre las desapariciones y como expresión de los combates por la memoria sobre las violaciones a los derechos humanos sucedidas en el país.

The significance of food is beyond its gastronomic value. Food symbolises a community's enriched past and holds cultural expressions and traditional knowledge. The linkage of food with religious beliefs, geo-climatic factors, social standards, and various health benefits builds the reputation of the food, which is essentially attributable to its geographic origin. Following the ratification of the Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS), the contracting states that have enacted Geographical Indications (GI) legislation (particularly those in Asia) have come forward to protect foodstuffs as GI in order to safeguard their communities and their traditional knowledge associated with foodstuffs. Against this background, the present article attempts to compare foodstuff GIs in eight selected Asian countries with a sui generis system of GI protection as TRIPS compliance. The comparative analysis of the evolution and scope of foodstuff protection, pre-registration and post-registration impact, and quality maintenance provides important insights into convergence and divergence among the selected Asian countries. The study further identifies policy implications for the sustenance of GI.

This essay reviews the following works:

Collision of Worlds: A Deep History of the Fall of Aztec Mexico and the Forging of New Spain. By David M. Carballo. Oxford: Oxford University Press, 2020. Pp. xvi + 351. $37.99 hardcover, $23.99 paperback, e-book. ISBN: 9780197661451.

Conquistadores: A New History of Spanish Discovery and Conquest. By Fernando Cervantes. New York: Viking, 2021. Pp. vxiii + 496. $35.00 hardcover, e-book. ISBN: 9781101981269.

Inca Apocalypse: The Spanish Conquest and the Transformation of the Andean World. By R. Alan Covey. Oxford: Oxford University Press, 2020. Pp. xix + 592. $34.95 hardcover. ISBN: 9780190299125.

Death in the Snow: Pedro de Alvarado and the Illusive Conquest of Peru. By George W. Lovell. Montreal: McGill-Queen’s University Press, 2022. Pp. xv + 280. $39.95 hardcover. ISBN: 9780228014409.

Strike Fear in the Land: Pedro de Alvarado and the Conquest of Guatemala, 1520–1541. By W. George Lovell, Christopher H. Lutz, and Wendy Kramer. Norman: University of Oklahoma Press, 2020. Pp. xvi + 194. $32.95 hardcover, $21.95 paperback, e-book. ISBN: 9780806190044.

German Conquistadors in Venezuela: The Welsers’ Colony, Racialized Capitalism, and Cultural Memory. By Giovanna Montenegro. Notre Dame, IN: University of Notre Dame Press, 2022. Pp. xvii + 372. $95.00 hardcover, $75.99 e-book. ISBN: 9780268203214.

Seven Myths of the Spanish Conquest. By Matthew Restall. Updated edition. Oxford: Oxford University Press, 2021. Pp. xix + 272. $21.99 paperback. ISBN: 9780197537299.

Conquistadors and Aztecs: A History of the Fall of Tenochtitlan. By Stefan Rinke. Oxford: Oxford University Press, 2023. Pp. ix + 328. $34.95 hardcover. ISBN: 9780197552469.

Supersonic backward-facing step (BFS) flow is numerically studied using direct numerical simulation (DNS) and global stability analysis (GSA) with a free stream Mach number of 2.16 and a Reynolds number of 7.938 × 105 based on the flat-plate length L and free stream conditions. Two-dimensional BFS flow becomes unstable to three-dimensional perturbations as the step height h exceeds a certain value, while no two-dimensionally unstable mode is found. Global instability occurs with the fragmentation of the primary separation vortex downstream of the step. Two stationary modes and one oscillatory unstable mode are obtained at a supercritical ratio of L/h = 32.14, among which the two stationary modes originate from the coalescence of a pair of conjugate modes. The most unstable mode manifests itself as streamwise streaks in the reattached boundary layer, which is similar to that in shock-induced separated flow, although the flow separation mechanisms are different. Without introducing any external disturbances, the DNS captures the preferred perturbations and produces a growth rate in agreement with the GSA prediction in the linear growth stage. In the quasi-steady stage, the secondary separation vortex breaks up into several small bubbles, and the number of streamwise streaks is doubled. A low-frequency unsteadiness that may be associated with the oscillatory mode is also present.

We generalize the known collision results for a solid in a 3D compressible Newtonian fluid to compressible non-Newtonian ones, and to Newtonian fluids with temperature-depending viscosities.