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Direct numerical simulation (DNS) of a Mach 4.9 zero-pressure-gradient turbulent boundary layer spatially developing over a cooled flat plate at wall-to-recovery temperature $T_w/T_r = 0.60$ is performed. Very long, streamwise contiguous domains are used in the DNS to achieve a wide continuous range of ‘useful’ friction Reynolds numbers of $1000 \lesssim {Re}_\tau \lesssim 2500$. The DNS datasets have been analysed to assess state-of-the-art compressibility scaling relations and turbulence modelling assumptions. The DNS data show a notable distinction in Reynolds number dependence between thermal and velocity fields. Although Reynolds stress and the budgets of turbulent kinetic energy have reached Reynolds number independence in the inner layer under semi-local scaling by ${Re}_\tau \simeq 1000$, the budget terms for temperature variance and turbulent heat flux retain a clear Reynolds number dependence near the wall over a broader range up to ${Re}_\tau \simeq 1900$. Such a stronger dependence of the thermal field on the Reynolds number may lead to inaccuracy in turbulence models that are calibrated on the basis of low-Reynolds-number data. Spectral and structural analysis suggests a more significant reduction in the prevalence of alternating positive and negative structures and an increase in the streamwise uniformity of streaks in the wall heat flux $q_w$ than in the wall shear stress $\tau _w$ when the Reynolds number increases.
Responding to increasing concerns regarding human-induced climate change and shared commitment as environmental educators to support climate action, we crafted this article as a composite piece — an emerging method of inquiry. We are eleven contributors: the Editorial Executive of the Australian Journal of Environmental Education and two colleagues who each respond to prompts concerning our experience of climate change and our practices of climate change education. The responses provide insights regarding how we strive to enact meaningful climate action, education, advocacy and agency. This article presents the reader with various ways environmental educators work through eco-anxiety and engage in active hope when supporting climate change education/agency/action. The following insights emerged, illustrating 1. the significance of embracing diverse perspectives and knowledge systems; 2. Emotions as catalysts for action and activism; 3. the value of fostering collaborative spaces/relationships/communities that empower people; 4. the importance of integrating ethical responses and critical climate literacy in climate change education/research; 5. learning from places and multi-species entanglements; 6. acknowledging tensions. We offer these six insights not as a solution but as a potentially generative heuristic for navigating the complexity and uncertainty of climate change education in contemporary times.
An ochreous precipitate isolated from a stream receiving acid-sulfate mine drainage was found to consist primarily of goethite and lesser amounts of ferrihydrite-like materials. The Fe-oxide fraction, including goethite, was almost totally soluble in acid ammonium oxalate. Similar materials were produced in the laboratory by hydrolysis of ferric nitrate solutions containing 250 to 2000 μg/ml sulfate as Na2SO4. Initial precipitates of natrojarosite transformed to Fe-oxides upon aging for 30 days at pH 6.0. The proportion of goethite in the final products decreased with increasing sulfate (SO4/Fe = 0.2 to 1.8) in the initial hydrolysis solutions; only ferrihydrite-like materials were produced at SO4/Fe ratios > 1.5. Variations in SO4/Fe solution ratios also produced systematic changes in the color (10R to 7.5YR) and surface areas (49 to 310 m2/g) of the dried precipitates, even though total S contents were relatively constant at 2.5 to 4.0%.
Episodic memory functioning is distributed across two brain circuits, one of which courses through the dorsal anterior cingulate cortex (dACC). Thus, delivering non-invasive neuromodulation technology to the dACC may improve episodic memory functioning in patients with memory problems such as in amnestic mild cognitive impairment (aMCI). This preliminary study is a randomized, double-blinded, sham-controlled clinical trial to examine if high definition transcranial direct current stimulation (HD-tDCS) can be a viable treatment in aMCI.
Participants and Methods:
Eleven aMCI participants, of whom 9 had multidomain deficits, were randomized to receive 1 mA HD-tDCS (N=7) or sham (N=4) stimulation. HD-tDCS was applied over ten 20-minute sessions targeting the dACC. Neuropsychological measures of episodic memory, verbal fluency, and executive function were completed at baseline and after the last HD-tDCS session. Changes in composite scores for memory and language/executive function tests were compared between groups (one-tailed t-tests with a = 0.10 for significance). Clinically significant change, defined as > 1 SD improvement on at least one test in the memory and non-memory domains, was compared between active and sham stimulation based on the frequency of participants in each.
Results:
No statistical or clinically significant change (N-1 X2; p = 0.62) was seen in episodic memory for the active HD-tDCS (MDiff = 4.4; SD = 17.1) or sham groups (MDiff = -0.5; SD = 9.7). However, the language and executive function composite showed statistically significant improvement (p = 0.04; MDiff = -15.3; SD = 18.4) for the active HD-tDCS group only (Sham MDiff = -5.8; SD = 10.7). Multiple participants (N=4) in the active group had clinically significant enhancement in language and executive functioning tests, while nobody in the sham group did (p = 0.04).
Conclusions:
HD-tDCS targeting the dACC had no direct benefit for episodic memory deficits in aMCI based on preliminary findings for this ongoing clinical trial. However, significant improvement in language and executive function skills occurred in response to HD-tDCS, suggesting HD-tDCS in this configuration has promising potential as an intervention for language and executive function deficits in MCI.
The introduction to the book describes the main claims in Theater, War, and Revolution in Eighteenth-Century France and Its Empire. Readers are introduced to major terms in the book, including the military–theatrical complex, military–theatrical experiences, and the national–military phenomenon. The book’s arguments are discussed in the context of France’s evoling geopolitical goals from 1765 to 1794 and with the help of several critical approaches, including Theater and Performance Studies, Gender Studies, and the cultural history of the French military. The end of the Introduction lays out the structure of the book and posits several key questions that the study hopes to answer.
Chapter 3 provides a critical reconstitution of pre-revolutionary military performance environments. First is a description of the development and operations of the Théâtre de la Marine in Brest, the only public theater that was built and financed by France’s war administration and where Joseph Patrat’s manipulated version of Louis-Sébastien Mercier’s Le Déserteur made its metropolitan French debut. The chapter’s second part focuses on the Comédie (Theater) in Cap-Français (now Cap-Haïtien), the largest and most frequented theater in the colonial Caribbean. In addition to describing the military, racial, and gendered features of theatrical life in Saint-Domingue, this chapter connects Cap-Français’ Comédie, which was built in 1764 and which catered in part to the city’s large soldier population, to a network of military-infused theaters in French provincial cities such as Metz, Besançon, Lille, Perpignan, and Brest.
This conclusion returns to Saint-Domingue, which by the 1790s was rife with Jacobin sentiment, rebellions of enslaved Black laborers and free people of color, and intra-military disaccord. Provided are several short case studies of soldier violence and political action, which offer several limitations and conclusions to the eighteenth-century military–theatrical complex. Unlike the expansive national–military theatrical phenomenon in metropolitan France, the continued commitment to inequality and segregation in Saint-Domingue led to the disintegration of its white-centric theatrical institutions and practices – an important step in what would become the Haitian Revolution.
This chapter shifts from male soldiers and issues of masculinity to the role of women in military plays. Described are the multiple and overlapping roles of women in the military–theatrical endeavor, which presents an alternative to traditional gestures such as contrasting active (male) citizenship with passive (female) domesticity. This chapter continues an examination of totalizing processes in Revolutionary-era theatricalized conflict by including French citoyennes in the military–theatrical endeavor. Interrogated here are three main categories for women and war in 1790s drama: female soldier (femmes-soldats; filles-soldats) plays, works about vivandières and cantinières (women providing service roles to combat units), and plays about the Revolution’s “militarized domestic sphere,” a wartime home front where armed conflict created specific forms of violent domesticity. With attention to military plays penned by women about their fellow citoyennes, as well as to recent feminist scholarship on women and war, this chapter explores a dramaturgical practice whereby women sought to reimagine citizenship after efforts to assert their rights in the political sphere ran asunder.
This chapter combines analysis of war dramas with military performance contexts to uncover strategies of totality, repetition, and reenactment in battle “event” plays from the French Revolution. The 1790s witnessed, according to some historians, the first “total war” and a deadly proliferation of both battles and casualties, especially after France raised a citizen army in 1793 of over 800,000 soldiers – one of the largest the world had ever seen. The Revolutionary (then Napoleonic) wars were not only massive in size but different in form and intensity. The Revolution was rife with military-themed drama, and this chapter highlights its war plays, performances, and their relations to the country’s evolving military goals and tensions. A corpus of approximately 110 dramatic and musical plays reveals stark differences between the Revolution’s war theater and its Old-Regime equivalent. Proposed here are new ways to describe and critically evaluate war theater, which often depicted recent military endeavors with documentary-inspired precision and an anxious totality of emotionally engaging performance strategies.
Chapter 2 brings to light a dozen desertion-themed plays and operas that followed in the wake of Le Siège de Calais. These works, which were performed during the Old Regime’s twilight, are analyzed alongside recent scholarship on military and early modern masculinities to tease out the theatricalization of an emerging martial culture that drew on emotional brotherhood and feminine exclusion. This chapter includes a comparative analysis of two versions of one play, Le Déserteur, a sentimental anti-war drame by Louis-Sébastien Mercier and an alternative version of the play that was dramaturgically “militarized” by Joseph Patrat for soldiers and sailors at the navy’s theater in Brest (Le Théâtre de la Marine). A close reading of variants, edits, and both textual and cultural manipulation presents war drama as a site of conflict in a larger intellectual battle where different factions in French society argued about reform cultures inside military and theatrical circles.
This chapter describes theatrical responses to France’s defeat in the Seven Years’ War (1756–1763), often described by historians as the first global war. This is achieved through a close reading of the dramatic text and performance history of Pierre-Laurent de Belloy’s Le Siège de Calais (1765), which was pitched by its author as France’s “first national tragedy” and used by government officials to rally French subjects around their country and their army. The play was vital in creating through theater a new relationship between French subjects and the nation’s armed conflicts. De Belloy’s success was predicated on his manipulation of new forms of “bourgeois” and “sentimental” drama, and the play went on to inspire more soldier plays and war dramas. The chapter concludes with an examination of the tragedy’s reverberations throughout the French empire by way of parodies and public readings of Le Siège de Calais in fairground theaters and military garrisons.