Twin Events Research Articles

On the Determining Physical Factor of Jet-related Coronal Mass Ejections’ Morphology in the High Corona

A solar jet can often cause coronal mass ejections (CMEs) with different morphologies in the high corona, for example, jet-like CMEs, bubble-like CMEs, and so-called twin CMEs that include a pair of simultaneous jet-like and bubble-like CMEs. However, what determines the morphology of a jet-related CME is still an open question. Using high spatiotemporal resolution stereoscopic observations taken by the Solar Dynamics Observatory and the Solar Terrestrial Relations Observatory from 2010 October to 2012 December, we performed a statistical study of jet-related CMEs to study the potential physical factors that determine the morphology of CMEs in the outer corona. Our statistical sample includes 16 jet-related CME events of which seven are twin CME events and nine are jet-like narrow CMEs. We find that all CMEs in our sample were accompanied by filament-driven blowout jets and Type III radio bursts during their initial formation and involved magnetic reconnection between filament channels and the surrounding magnetic fields. Most of our cases occurred in a fan-spine magnetic configuration. Our study suggests that the bubble-like components of twin CMEs lacking an obvious core are related to the expansion of the closed-loop systems next to the fan-spine topology, while the jet-like component is from the coronal extension of the jet plasma along open fields. Based on the statistical results, we conclude that the morphology of jet-related CMEs in the high corona may be related to the filament length and the initial magnetic null point height of the fan-spine structures.

Tectonic Duets: Self-Similar Approach to Investigate Eastern Anatolian Fault’s Recent Seismicity, with Special Emphasis on the 6 February 2023 Earthquake Doublet

Abstract Earthquake clusters possess profound potential for discerning antecedent seismic cues. This study examines the self-similarity of earthquakes to characterize recent seismic patterns in the prolonged quiescent Eastern Anatolian fault zone (EAFZ). We thoroughly investigate the correlation fractal dimension (Dc) formulated upon the scale-invariant relative clustering in earthquake pattern identification. We provide a comprehensive examination of pre- and postseismicity patterns of the Mw 7.7 Nurdağı-Pazarcık, Mw 7.6 Ekinözü, and Mw 6.7 Elazığ earthquakes, each shattering different segments of the EAFZ. The spatiotemporal fluctuations of Dc suggest the commencement of the preparatory process observed around October 2021 to February 2022 for the 2023 dual catastrophe, whereas in the case of the Mw 6.7 Elazığ, this was witnessed from November 2018. Prior to the 2023 events, low-moderate Dc regions predominated on the Pazarcık segment and Cardak fault. The Pürtürge segment that ruptured with an Mw 6.7 event was within a low Dc area. We identified a consistent relationship between stress levels and Dc for the 2023 twin events and the Mw 6.7 earthquake, with low Dc indicative of high stress. Intriguingly, mainshocks and a substantial proportion of their aftershocks have occurred within areas characterized by low to moderate Dc. Various fault zones like Malatya, Amanos, and Adiyaman are situated in areas with low Dc. The southwestern area of the Amanos segment exhibits clustering, elevated stress levels, and low Dc, followed by the Mw 7.7. Therefore, it is imperative to maintain vigilant monitoring of this region to prevent another disaster.

“Workers’ Way”: Moments of Labor in Late 1940s Calcutta

AbstractThe postwar situation in Calcutta was part of the picture of seething anticolonial popular and labor discontent in the Indian subcontinent; this was perhaps the most radical, the most potent, period for the subalterns in the country. However, this complex historical moment with varied, competing, shifting, overlapping tendencies has been reduced and flattened in the historiography. It is as if the twin events of partition and independence were inevitable. City workers, especially the port workers, emerged as a visible and powerful presence in the anticolonial movement. By reconstructing the arena of collective action—focusing on the context, the modalities, and the social content of the major strikes involving port labor or “moments” of radicalism, this article seeks to recover the role of workers in decolonization. It will show how workers contested and outstepped the politics of nationalist leadership(s) and communalism in significant ways multiple times, placing a politics of labor rights and entitlements, of struggles against exploitation and poverty on the postcolonial agenda. The article argues that a “workers’ way,” an alternative even if hazily defined pathway of decolonization, in which new citizens would not be divided on religious lines, was concretized and became a part of the political imagination of the time. The port strike of 1947, a swing-back from the deadliest episode of communal riots, in a matter of months, signifies the extreme fluidity of the political situation in the late 1940s, which is unsurprisingly missed in the conventional historiography. The article finally highlights the limits of postwar radicalism: the “historic” port workers’ strike was ultimately channelized as a legal industrial dispute by the communist leadership of port workers’ union. With their key demand of parity of wages and allowances with government employees, port workers staked their claim to labor institutions offered by the postcolonial state, which was to cordon large sections of them as a privileged layer from rest of the laboring classes in the city.“To articulate the past historically. . . . It means to seize hold of a memory as it flashes up at a moment of danger. . . . Only that historian will have the gift of fanning the spark of hope in the past who is firmly convinced that even the dead will not be safe from the enemy if he wins. And this enemy has not ceased to be victorious.” Walter Benjamin, Theses on the Philosophy of History.

1994 – a temporal and scalar exploration of a Norwegian climax

This article explores ‘1994’ as a cultural-historical ‘moment’ in order to tease out the layered manifestation of ‘Norway’ in a globalizing world. With offset in the oral testimonies, news coverage, reports, analysis and memories of people experiencing and contextualizing the two events of the Lillehammer Winter Olympics and the Norwegian referendum on membership in the EU, the article pursues their meaning along several temporalities and on multiple spatial scales. The argument is that ‘1994’ marked a symbolic climax and watershed moment for Norwegian (cultural) patriotism and the dispersion of what ‘Norway’ meant in a national, Nordic, European and global context. But the climax’s meaning were fragmented across time and space, and the monolithic moment has increasingly come to be filled with silences, anxieties and frustrations. Indeed, the Norwegian climax of 1994 dissolved in commercialism, mediatized fragmentation, Europeanization and globalization. The recognition that neither the ‘uniqueness’ of the ‘best Olympic Winter Games ever’ nor the ideational and historical significance of the Norwegian ‘no’ was received as intended by the sender, makes their temporal manifestations in the national context all the more significant: The simultaneous resurrection and burying of these twin events of the 1994-climax can thus be understood as a significant catalyst of Norway’s cultural and political myopia through a period of hasty, tumultuous and increasingly troublesome globalization.

Economic history into the perspective of economic thought and historiography: Between the Symplegade Manolis Manioudis

The relation between economic theory and history, as is crystallised in the history of economic thought, determined the evolution of economic history proper. The twin events of the Marginalist Revolution and the Methodenstreit were crucial in exiling history from economic theory. Moreover, the dominance of the narrative historiographical paradigm in historiography, till the first decades of the twentieth century, determined the absence of theory from economic history. This twofold hiatus is decisive in the short history of economic history. This paper attempts to delineate this gap by showing that an organic symphysis between economic theory and history is indispensable in the understanding economic phenomena.

Tempo e gravidade: emprestar da dança um léxico poético

O artigo propõe uma forma de leitura de poesia concentrada em seus efeitos corporais, aproximando-a, mesmo na modalidade silenciosa, da experiência da performance, em que encontramos o outro, materialmente. Proponho, como introdução, uma aproximação entre o advento da poesia moderna e o surgimento da dança moderna, concentrando-me em seus conflitos com os limites de seus meios de expressão – linguagem e corpo. Aproximo teoria poética e teoria da dança moderna, emprestando desta reflexões acerca de elementos como movimento, espaço e, sobretudo, peso e tempo. Por fim, realizo uma leitura experimental de dois poemas portugueses modernos, de Camilo Pessanha e Mário de Sá-Carneiro.

‘Produce or Perish’. The crisis of the late 1940s and the place of labour in post-colonial India

AbstractThis article argues that the late 1940s in India should no longer be reduced to the twin events of partition and independence. A generalized political crisis unsettled, for a brief period, the structures of social and economic power, and not just intercommunity relations and the constitution of the state. These years were thus, among other things, a catalytic moment for the definition of ‘labour’ as both a political category and a parameter of post-colonial politics: processes dating back to the First World War, at least, were consolidated, under pressure from this crisis, into a new labour regime that has withstood political pressure for almost seven decades. The article offers an analysis of the almost-forgotten post-war strike movement, which was nevertheless unprecedented in its social and geographical spread. The movement elicited both repressive and reformist responses: the extraordinary level of emergency powers applied to suppress it are, therefore, as much examined as the series of momentous legislative and institutional changes of the late 1940s. In conclusion, the long-term consequences of this cycle of strike–reform–repression for India's post-colonial labour regime are adumbrated. A strongly etatist, potentially authoritarian, regime of industrial relations, it is argued, was checked by an enduring political trade union pluralism. At the same time, divisions within India's working classes were deepened and consolidated as labour law and social legislation sealed off the comparatively small ‘core workforces’ of public sector and large-scale industrial enterprises from the majority of workers in what would soon be called the ‘informal economy’.

Time to think differently: catalysing a paradigm shift in forensic science.

‘It is not the strongest of the species that survive, nor the most intelligent but the one most responsive to change’.Attributed to C. Darwin, FRS. It has been a privilege to be part of the adventure that culminated in the Royal Society's twin events designed to enable and encourage the

In Situ Characterization of Twin Nucleation in Pure Ti Using 3D-XRD

A small tensile specimen of grade 1 commercially pure titanium was deformed to a few percent strain with concurrent synchrotron X-ray diffraction measurements to identify subsurface {10\( \bar{1} \)2} twin nucleation events. This sample was from the same piece of material in which a prior study showed that twin nucleation stimulated by slip transfer across a grain boundary accounted for many instances of twin nucleation. The sample had a strong c-axis texture of about eight times random aligned with the tensile axis. After ~1.5 pct tensile strain, three twin nucleation events were observed in grains where the c-axis was nearly parallel to the tensile direction. Far-field 3-D X-ray diffraction data were analyzed to obtain the positional center of mass, the average lattice strain, and stress tensors in each grain and twin. In one case where the parent grain was mostly surrounded by hard grain orientations, the twin system with the highest resolved shear stress (RSS) among the six {10\( \bar{1} \)2} twin variants was activated and the stress in the parent grain decreased after twin nucleation. In two other parent grains with a majority of softer neighboring grain orientations, the observed twins did not occur on the twin system with the highest RSS. Their nucleation could be geometrically attributed to slip transfer from neighboring grains with geometrically favorable 〈a〉 basal slip systems, and the stress in the parent grain increased after twin nucleation. In all three twin events, the stress in the twin was 10 to 30 pct lower than the stress in the parent grain, indicating load partitioning between the hard-oriented parent grain and the soft-oriented twin.

UPDATED PHOTOMETRY AND ORBITAL PERIOD ANALYSIS FOR THE POLAR AM HERCULIS ON THE UPPER EDGE OF THE PERIOD GAP

Twenty-one new optical light curves, including five curves obtained in 2009 and sixteen curves detected from the AAVSO International Database spanning from 1977 to 2011, demonstrate 16 new primary minimum light times in the high state. Furthermore, seven newly found low-state transient events from 2006 to 2009 were discovered, consisting of five Gaussian-shaped events and two events with an exponential form with decay timescales of $<$0.005 days; these timescales are one order of magnitude shorter than those of previous X-ray flare events. In the state transition, two special events were detected: a "disrupted event" with an amplitude of $\sim$ 2 mag and a duration of $\sim$ 72 minutes and continuing R-band twin events larger than all known R-band flares detected in M-type red dwarfs. All 45 available high-state data points spanning over 35 yr were used to construct an updated O-C diagram of \objectname{AM Herculis}, which clearly shows a significant sine-like variation with a period of 12-15 yr and an amplitude of 6-9 minutes. Using the inspected physical parameters of the donor star, the secular variation in the O-C diagram cannot be interpreted by any decided angular momentum loss mechanism, but can satisfy the condition $\tau_{\dot{\rm M}_{2}}\simeq\tau_{\rm KH}>>\tau_{\dot{\rm R}_{\rm 2}}$, which is required by numerical calculations of the secular evolution of cataclysmic variables. In order to explain the prominent periodic modulation, three plausible mechanisms - spot motion, the light travel-time effect, and magnetic active cycles - are discussed in detail.

Introduction: Feminist Art and Social Movements Beyond NY/LA

Introduction:Feminist Art and Social Movements Beyond NY/LA Michelle Moravec (bio) Imagine a far-flung network of moles, each separately burrowing under a cultural landscape that spans from the Los Angeles County Museum of Art to the Whitney Museum in New York. The moles may not be entirely aware of it, but after several thousand of them individually put in a decade or so of subterranean overtime, it appears that together they quite literally made an imposing mountain range out of vigorously displaced earth. Never again would anyone dare to regard their peaks as insignificant patch of molehills. Carrie Rickey, "Writing (and Righting) Wrongs: Feminist Art Publications" The vivid image with which Carrie Rickey introduces her survey of feminist art publications captures the sense of subterranean energy and collaborative achievement that characterized the feminist art movement of the 1970s. At the same time, however, Rickey's metaphor belies the geographic bias of histories of that movement. A more realistic map of the molehills would be far-flung and reveal that many other routes existed beside the obvious one between New York and Los Angeles. This special issue seeks alternative readings of this map by examining sites of feminist art ranging from the Midwest of the United States to the Middle East. I initially conceived of this special issue in the summer of 2009 when I was a Getty Scholar working on an exhibition about the Los Angeles Woman's Building, reviewed in this issue by Jennie Klein. The conversations I had with Klein, and the other scholars, Vivian Green Fryd, Alexandra Juhasz, and Jenni Sorkin, spurred me to consider the consequences of the regional biases in histories of the feminist art movement. [End Page xi] In 2006 and 2007 twin events, the creation of the Elizabeth A. Sackler Center for Feminist Art at the Brooklyn Museum and the mounting of WACK! Art and the Feminist Revolution, created the sense that the 1970s feminist art movement had finally found its place in the art historical record, but significant gaps still existed. Most accounts continued to rely on the same few groups in two locations, New York and Los Angeles. Furthermore, as a historian who studies feminist artists as part of activism for women's liberation in the 1970s, I feared that the social movement aspect of feminist art was being lost "in a movement that is increasingly being talked about and curated in monolithic ways."1 I began to envision a special issue dedicated to feminist art as a movement "beyond NY/LA." As soon as I conceived of this special issue, Frontiers occurred to me as the perfect venue for it. Since its inception Frontiers has occupied a unique niche in the women's studies community, juxtaposing traditional scholarship alongside articles by activists, as well as women's poetry and art. I would like to thank the editors of Frontiers, Susan E. Gray and Gayle Gullett, the art editor, Hilary Harp, and the graduate assistant, Stephanie Schreiner, for their assistance as we collaborated on this special issue. Initially I sought submissions that dealt with the broad range of artists, activities, and art forms that fall under the umbrella term feminist art movement. I hoped to include groups with strong ties to the women's liberation movement, such as the Chicago Women's Liberation Union Graphics Collective or the short-lived Redstockings Artists, as well as groups and individuals connected to contemporaneous movements, such as the black arts movement or Chicano and Chicana muralists. I wondered if any case studies existed of the ways that the big events in New York or Los Angeles, or the widely circulated writings by feminist artists in those cities, led to organizing in other locations. While not all my envisioned topics are covered in the articles published in this special issue, the contributions included do a great deal to move the focus "beyond NY/LA." In "Frontiers in Feminist Art History," Jill Fields situates these articles within the larger historiographical question: has recent attention to the feminist art movement changed "standard narratives of modern and contemporary art history"? (2) My essay "Toward a History of Feminism, Art, and Social Movements in the United States...

Diasporic Memories and National Histories in East African Asian Writing

This article analyzes texts by East African Asian writers in order to tease out ambiguities and disjunctions that problematize the relationship between nation and diaspora. First, I briefly mention the counternationalistic discourses towards which this literature seems to gesture and then read texts by Moyez Vassanji and Jameela Siddiqi to show how their works gesture toward the diasporic imaginary while persistently returning to the site of the nation to enact the difference of the diasporic subject. I argue that these works disavow and at the same time re-inscribe national narratives as if to suggest the continuing significance of the nation as a site of enacting the politics of identity. I discuss how these writers, for example, deal with the fact that the Asian attempt to relate to the national memory in Kenya, Tanzania, and Uganda is often circumscribed by the perception that they do not share, in equal measure at least, the experience of colonial oppression and the history of decolonization, twin events that provide defining moments in the construction of nationhood in these countries. I conclude that the very act of writing the Asian presence in East Africa is itself an attempt to uncover connections to histories of resistance that get suppressed when the stereotype of Asians as collaborators of colonialism is amplified within the official discourse of nation building.

The End of Occupation: Iraq 2004

Can a military occupation-and all the responsibilities of an occupying power as laid down in the laws of war—end at a single moment in time, and without the actual departure of the foreign military forces involved? This is the core question posed by the planned twin events of 28 June 2004 in Iraq: (1) the assumption of full authority by the sovereign Interim Government of Iraq, and(2) the proclaimed end of the US-led occupation of Iraq that had begun during the war of March-April 2003.

Twin Weddings; Twin Research Summaries; Twin Events; Professor Phil S. Holzman

People are intensely interested in factors underlying earning power and what can be done to enhance it. A recent study using monozygotic male twins adds to knowledge in this area. Based on data from 136 twin pairs, the investigators favored a correlational hypothesis, namely that simply being married raises salaries by 19 to 26%. Following a review of this research, summaries of twin studies presented at the biennial meeting of the International Society for Human Ethology in Ghent, Belgium (July 27–30, 2004) and at the annual meeting of the Human Behavior and Evolution Society in Berlin, Germany (July 21–25, 2004) are presented. The final section of this article provides information of general interest to twin researchers, physicians and others working in twin-related fields.

Twin Weddings; Twin Research Summaries; Twin Events; Professor Phil S. Holzman

People are intensely interested in factors underlying earning power and what can be done to enhance it. A recent study using monozygotic male twins adds to knowledge in this area. Based on data from 136 twin pairs, the investigators favored a correlational hypothesis, namely that simply being married raises salaries by 19 to 26%. Following a review of this research, summaries of twin studies presented at the biennial meeting of the International Society for Human Ethology in Ghent, Belgium (July 27–30, 2004) and at the annual meeting of the Human Behavior and Evolution Society in Berlin, Germany (July 21–25, 2004) are presented. The final section of this article provides information of general interest to twin researchers, physicians and others working in twin-related fields.

Multiple delays in QSO 0957+561: observational evidence and interpretation

Q0957+561A,B is a double-imaged quasar that has been intensively observed during the last 10 yr in different optical bands and with several telescopes, and we concentrated on recent public data obtained at the Apache Point Observatory (APO) and the Teide Observatory (TO). When an intrinsic event appears in the light curve of Q0957+561A, its twin event (a similar feature) is seen in the brightness record of Q0957+561B, and thus, one can measure the corresponding time delay. The TO data set includes two prominent twin events, which were detected with a time separation of 425 ± 4 d. On the other hand, from the APO data set, we found a clear evidence for two different time delays associated with two pairs of twin events: 417.0 ± 0.6 (APO main twin events) and 432.0 ± 1.9 d (APO secondary twin events), where the APO (main)–APO (secondary) difference delay is of −15 ± 2 d. In agreement with Yonehara's idea, if the three pairs of twin events are originated inside a standard hybrid source (accretion disc and circumnuclear stellar region), the three measured time delays indicate that they do not come from a common zone in the source. Therefore, we can consider that the prominent features are caused by flares in a standard hybrid source and discuss the size and nature of the region of flares. In this paper it is shown that the more plausible interpretation is that two of the three flares are generated at distances (from the central black hole) larger than 90 pc. Some stellar scenarios can explain the two flares far away from the black hole, while phenomena in the accretion disc cannot cause them.

On retroactive occurrence and twin events in quantum mechanics

Bohr's well-known claim that only a registered phenomenon is a true phenomenon is further elaborated into occurrence in the past: If ideal occurrence of an eventP ((1−P)) is a stateρ at a timeti makes another eventQ ((1−Q))certain at a later timetf, and, finallyU is the evolution operator fromti totf, then, it is proved that the final collapsed stateQ(U ρU+)Q/TrQU ρU+, which comes about in ideal occurrence ofQ attf,equals the initial collapsed stateU(P ρP/TrPρ)U+, which evolves from the state resulting from the ideal occurrence ofP inρ atti. Utilizing the latter state is called theretroactive apparent ideal occurrence (RAIO) ofP inρ. A number of consequences, including the general notion of twin events (the case whentf=ti, andU=1) is derived. It is pointed out that RAIO is relevant in second-kind quantum measurement, in Wheeler's delayed-choice experiments in second-kind (or conditional) quantum preparators.

On state-dependent implication in quantum-mechanical distant correlations

Let be an arbitrary given composite-system state (statistical operator). It is shown that same-subsystem events imply each other state-dependently according to if and only if they act equally in the range of the corresponding subsystem state (reduced statistical operator). Opposite-subsystem events imply each other in the same way if and only if they are twin events, i.e. . If is a pure state, it is shown that the anti-unitary correlation operator also plays a decisive role in the latter implication.