bluuebunny/crossref_metadata_2025 huggingface dataset:
The Chromatic Fourier Transform
Authors: Barthel Tobias , Carmeli Shachar , Schlank Tomer M. , Yanovski Lior
Published: April 2024

We develop a general theory of higher semiadditive Fourier transforms that includes both the classical discrete Fourier transform for finite abelian groups at height

$n=0$

, as well as a certain duality for the

$E_n$

-(co)homology of

$\pi $

-finite spectra, established by Hopkins and Lurie, at heights

$n\ge 1$

. We use this theory to generalize said duality in three different directions. First, we extend it from

$\mathbb {Z}$

-module spectra to all (suitably finite) spectra and use it to compute the discrepancy spectrum of

$E_n$

. Second, we lift it to the telescopic setting by replacing

$E_n$

with

$T(n)$

-local higher cyclotomic extensions, from which we deduce various results on affineness, Eilenberg–Moore formulas and Galois extensions in the telescopic setting. Third, we categorify their result into an equivalence of two symmetric monoidal

$\infty $

-categories of local systems of

$K(n)$

-local

$E_n$

-modules [-12pc] and relate it to (semiadditive) redshift phenomena.

The Great Wave off Kanagawa, Katsushika Hokusai.
Manipulation of a turbulent boundary layer using sinusoidal riblets
Authors: Cafiero Gioacchino , Amico Enrico , Iuso Gaetano
Published: April 2024

We investigate experimentally the effects of micro-grooves on the development of a zero pressure gradient turbulent boundary layer at two different values of the friction Reynolds number. We consider both the well-known streamwise aligned riblets as well as wavy riblets, characterized by a sinusoidal pattern in the mean flow direction. Previous investigations by the authors showed that sinusoidal riblets yield larger values of drag reduction with respect to the streamwise aligned ones. We perform new particle image velocimetry experiments on wall-parallel planes to get insights into the effect of the sinusoidal shape on the near-wall organisation of the boundary layer and the structures responsible for the friction drag reduction and the turbulence generation. Conditional averages, aimed at identifying the topology of the low-speed streaks in the turbulent boundary layer, reveal that the flow is highly susceptible to wall manipulation. This is particularly evident in the cases that are associated with greater values of drag reduction. The results suggest a fragmentation and/or weakening of the streaks in the sinusoidal cases, that is triggered by the larger values of the wall-normal vorticity found at the streaks’ edges. The results are also confirmed by applying the variable interval spatial averaging events eduction technique. The turbulent kinetic energy budget also shows that the sinusoidal geometry significantly attenuates the turbulence production, hence supporting the idea of the manipulation of the turbulence regeneration cycle.
Buffon’s problem determines Gaussian curvature in three geometries
Authors: Abelgas Aizelle , Carrillo Bryan , Palacios John , Weisbart David , Yassine Adam M.
Published: April 2024

A version of the classical Buffon problem in the plane naturally extends to the setting of any Riemannian surface with constant Gaussian curvature. The Buffon probability determines a Buffon deficit. The relationship between Gaussian curvature and the Buffon deficit is similar to the relationship that the Bertrand–Diguet–Puiseux theorem establishes between Gaussian curvature and both circumference and area deficits.
Exploring conceptual representation and grounding through perceptual strength norms in deaf individuals
Authors: Amenta Simona , Loca Giulia , Gianfreda Gabriele , Rinaldi Pasquale , Pavani Francesco
Published: April 2024

In this study, our objective was to explore the impact of hearing loss on the conceptual system underlying word meaning. We collected perceptual strength norms for 200 Italian words from early deaf individuals with limited or no access to auditory information and compared them to existing norms from hearing individuals. For each word, participants provided perceptual strength ratings for each perceptual modality. Our results revealed a significant reduction of the auditory modality in the norms provided by deaf individuals compared to the hearing population. However, we did not observe an overall decrease in reported perceptual strength. Interestingly, we found a heightened involvement of other sensory modalities accompanied by reduced modality exclusivity in the conceptualization of words, indicating that deaf individuals heavily rely on information coming from the other perceptual modalities to form concepts. These findings suggest that hearing loss leads to a reorganisation of word conceptualization, characterised by increased multisensoriality. Importantly, although diminished, the auditory modality remains present, suggesting that deaf individuals can still infer auditory-associated knowledge about words to some extent.
The expansion of medical education in the Dutch East Indies and the formation of the Indonesian medical profession
Authors: Pols Hans
Published: April 2024

In 1851, the colonial administration of the Dutch East Indies established a two-year program to educate young Javanese men to become vaccinators in Batavia (today’s Jakarta). During the following sixty years, the medical curriculum was expanded several times; in 1913, it consisted of a ten-year program. In 1927, the Batavia Medical School, granting degrees equivalent to those of Dutch university-affiliated medical schools, commenced operations. Consequently, a steadily increasing number of Indonesian physicians with various credentials were employed by the colonial health service, plantations, sugar factories and mines, or established private practices. They became a social group that occupied an ambiguous and even paradoxical position somewhere between Europeans and the indigenous population. During the 1910s, this inspired these physicians to obtain credentials and professional recognition equal to those of their European colleagues. Several of them became active in journalism, politics and social movements. During the 1920s, several became radicalised and criticised the nature of colonial society. In the 1930s, following the increasingly repressive nature of colonial society, most of them remained active in the public sphere while a small group dedicated itself to improving medical research and health care. After the transfer of sovereignty from the Netherlands to Indonesia on 27 December 1949, this small cadre reestablished medical education and health care, and built the Indonesian medical profession.
The distance from tree legumes in silvopastoral systems modifies the litter in grass-composed pastures
Authors: Santos Amanda Maria Gallindo dos , Dubeux Jose Carlos Batista , Santos Mércia Virginia Ferreira dos , Costa Suellen Brandão de Miranda , Côelho Diego de Lima , Santos Erick Rodrigo da Silva , Silva Naligia Gomes de Miranda e , Oliveira Bárbara Marcélia Martins de , Apolinário Valéria Xavier de Oliveira , Coelho Janerson José
Published: April 2024

The use of silvopastoral systems with tree legumes is a viable alternative to recover and develop pastures, as they add N to the system influencing pasture growth. This study hypothesized that the herbage and litter of signalgrass (Urochloa decumbens Stapf) is affected by legume trees in the pasture. Treatments were composed of (1) signalgrass + Mimosa caesalpiniifolia Benth.; (2) signalgrass + Gliricidia sepium Jacq.; and (3) signalgrass monoculture. The 3-year experiment followed a randomized complete block design with three replications. Tree legumes were planted in double rows (15 × 1 × 0.5 m), in 1 ha paddocks. Litter samples were taken in five distance points (0, 1.8, 3.7, 5.6 and 7.5 m) perpendicular to tree legume rows. Signalgrass was taller at longer distances from the trees (P < 0.05). Signalgrass height differed between treatments, with taller signalgrass found in pastures mixed with G. sepium (15.6 cm) compared to M. caesalpiniifolia (9 cm) (P < 0.05). Herbage N content decreased with increasing distance from tree rows (P < 0.05). Litter N content followed a similar pattern, ranging from 23 g/kg under the trees to 12 g/kg at 7.5 m away from tree rows. Signalgrass did not grow under the tree crown (0–1.8 m), especially when intercropped with M. caesalpiniifolia. The findings of this study suggest that the type of legume trees used in the silvopastoral system has the potential to modify the pattern of grass growth and content of N in pasture litter.
Southern Tati: Takestani Dialect
Authors: Taherkhani Neda , Nelson Scott
Published: April 2024

Southern Tati is a North-Western Iranian language in the Indo-European language family. Different varieties of this language group are spoken intermittently in the northern and northwestern parts of Iran, mainly in the Qazvin, Alborz, Markazi, Tehran, Ardabil, Gilan, Zanjan, and Khorasan-e-Shomali provinces. Previous linguistic work on the language consists of multiple descriptive grammars. These include Yarshater’s (1969) analysis of multiple Tati dialects including Takestani, Chali, Eshtehardi, Xiaraji, Ebrahim-abadi, Sagz-abadi, Danesfehani, Esfarvarini, and Xozini, as well as Taheri’s (2009) and Rahmani & Rahmni’s (2021) analyses of the Takestani dialect. The variety of Southern Tati analyzed in this study is the Takestani dialect (tks, ISO 639-3). Takestani is spoken by the Tat community in the city of Takestan, known by its residents as Siayden (IPA: [sijʌˈten]). The speakers of Takestani know their dialect of the Tati language as Siaydiniji (IPA: [sijʌtiniˈd͡ʒi]), as ‘related to the residents of Siaden.’ Figure 1 shows the location of Takestan in the Qazvin province in Iran.
Wildlife conservation through traditional values: alarming numbers of crocodile attacks reported from Timor-Leste
Authors: Brackhane Sebastian , Fukuda Yusuke , Xavier Flaminio M.E. , de Araujo Vitorino , Gusmao Marcal , Trindade Josh , do Amaral de Carvalho Demétrio , Dos Reis Pires Rui , Webb Grahame
Published: April 2024

On the IUCN Red List the saltwater crocodile Crocodylus porosus is categorized globally as Least Concern, with national populations ranging from fully recovered to extinct. The saltwater crocodile population of the Southeast Asian island nation of Timor-Leste was severely depleted by colonial hunting but has recovered since independence in 2002. During 2007–2014 there was a 23-fold increase in reported crocodile attacks (104 documented attacks), concomitant with a 2% annual increase in the human population. Public tolerance to attacks and the reluctance to harm crocodiles are entwined with reverence of crocodiles as sacred beings by most but not all Timorese people. In 2022, 7–8 years after our previous assessment, we visited five sites on the south coast of Timor-Leste in Lautém, Viqueque, Manufahí and Cova Lima municipalities. High rates of crocodile attacks continue. We obtained 35 records of attacks for 2015–2022 (34% fatal). In the municipalities where crocodile attacks occurred (Lautém, Viqueque, Cova Lima), the sacred status of crocodiles prevented inhabitants from harming them in retribution. In Manufahí, where no attacks were reported, such traditional values never existed and crocodiles were hunted for subsistence and to improve safety. The design of a context-specific crocodile management programme that respects the reverence attributed to crocodiles by most people but reduces the risk of people being attacked by crocodiles is a conservation management challenge for the government of Timor-Leste. The developing tourism industry, which relies on coastal beaches and reefs, is jeopardized by the risk of crocodile attacks.
Early auditory processing abnormalities alter individual learning trajectories and sensitivity to computerized cognitive training in schizophrenia
Authors: Molina Juan L. , Joshi Yash B. , Nungaray John A. , Sprock Joyce , Attarha Mouna , Biagianti Bruno , Thomas Michael L. , Swerdlow Neal R. , Light Gregory A.
Published: April 2024

Background

Auditory system plasticity is a promising target for neuromodulation, cognitive rehabilitation and therapeutic development in schizophrenia (SZ). Auditory-based targeted cognitive training (TCT) is a ‘bottom up’ intervention designed to enhance the speed and accuracy of auditory information processing, which has been shown to improve neurocognition in certain SZ patients. However, the dynamics of TCT learning as a function of training exercises and their impact on neurocognitive functioning and therapeutic outcomes are unknown.

Methods

Forty subjects (SZ, n = 21; healthy subjects (HS), n = 19) underwent comprehensive clinical, cognitive, and auditory assessments, including measurements of auditory processing speed (APS) at baseline and after 1-h of TCT. SZ patients additionally completed 30-hours of TCT and repeated assessments ~10–12 weeks later.

Results

SZ patients were deficient in APS at baseline (d = 0.96, p < 0.005) relative to HS. After 1-h of TCT, analyses revealed significant main effects of diagnosis (d = 1.75, p = 0.002) and time (d = 1.04, p < 0.001), and a diagnosis × time interaction (d = 0.85, p = 0.02) on APS. APS learning effects were robust after 1-h in SZ patients (d = 1.47, p < 0.001) and persisted throughout the 30-h of training. Baseline APS was associated with verbal learning gains after 30-h of TCT (r = 0.51, p = 0.02) in SZ.

Conclusions

TCT learning metrics may have prognostic utility and aid in the prospective identification of individuals likely to benefit from TCT. Future experimental medicine studies may advance predictive algorithms that enhance TCT-related clinical, cognitive and functional outcomes.
Pledging Lordly Rights and “Squeezing” Local Communities in the Later Middle Ages
Authors: Lyon Jonathan R.
Published: April 2024

The fourteenth and fifteenth centuries were a period of rising expenses and mounting debt for Holy Roman emperors and other German lords. Rulers frequently sought to pay off these debts by pledging rights and properties to their creditors, who would then collect the income from those rights and properties over several years as a means of recuperating the money they were owed. However, this practice could generate tensions as well as cycles of conflict and negotiation at the local level, because pledge-holders often recovered their money by extracting as much income as possible from those communities impacted by the pledge. This article provides a general overview of the phenomenon of the pledging of lordly rights before turning to a case study, the pledging of the court at Hoym to the town of Quedlinburg in the mid-fifteenth century, to investigate more closely the local impact of the pledge.
The Worlds of Labor in Ghana’s Gold Mining Industry, c. 1895–1957
Authors: Curless Gareth
Published: April 2024

The global turn has contributed to a revitalization of labor history. Historians have become increasingly attentive to the varied forms of labor commodification that existed under capitalism. Many historians have welcomed this approach which challenges the universalism of “free” wage labor. Critics, however, have warned that global labor history risks re-inscribing the power of capital at the expense of local specificities, particularly in terms of the plurality of labor’s worlds and its (dis)connections with capital. This is not a new debate within African studies. Since the 1980s, historians of Africa have questioned the privileging of wage labor at the expense of other forms of labor and the focus on (post)colonial workplace relations to the exclusion of other relational power structures which shaped the behavior of African men and women. This article takes up these debates by focusing on different forms of labor connected to the gold mining industry in colonial Ghana. The article argues that African men and women involved in the mining sector, including mineworkers, petty traders, and sex workers, responded to their experience of commodification in ways that were about more than just their status as abstract sellers of labor power. What emerges from this analysis is a more nuanced understanding of the strategies and aspirations of African labor which was connected to the mining sector. That is to say, where colonial officials saw working patterns that were purportedly symptomatic of the “lazy” and “ill-disciplined” character of African labor, this article demonstrates otherwise. The behavior of African labor associated with the mining sector was indicative of choices that were made in accordance with individual and collective needs connected to issues of class, gender, and generation, which, in turn, were “entangled” with capitalist market imperatives but not necessarily determined by them.
Ars Antiqua motets in fourteenth-century Italy: liturgical priorities, style and notation in Bodleian, lat. liturg. e. 42
Authors: THOMSON MATTHEW P.
Published: April 2024

The motets in the fourteenth-century liturgical manuscript Oxford, Bodleian, lat. liturg. e. 42 have, despite some sidelong glances, not been the subject of any concentrated study since F. Alberto Gallo introduced them in 1970. This article proposes a date for the copying of these motets in the first few decades of the fourteenth century and demonstrates that they have much to add to ongoing debates about stylistic and notational change between the Ars Antiqua and Ars Nova styles. First, they underline the importance of considering polyphony within the context of the whole book that transmits it: e. 42's motets work together with its monophonic chant to emphasise a set of feasts which were particularly important for the compilers of this manuscript within their institutional context. Second, these motets act as an important reminder that narratives of fourteenth-century stylistic change must be heterogeneous: the wide-ranging mix of musical styles found in the motets of e. 42 add to an emerging picture of early fourteenth-century Ars Antiqua collections in which such stylistic eclecticism is a common feature. Third, e. 42's notation and its connections to that of other manuscripts enrich and complicate narratives of notational change in this period. Parallels for e. 42's ligature use can be found in a temporally and geographically diverse set of manuscripts. Its notation of semibreves, however, resembles that of a smaller group of manuscripts from the early fourteenth century and provides an important witness for the changes to semibreve rhythm at that time.
New evidence from Shrewsbury on the creation and circulation of music in high-medieval England
Authors: STEBBING JACK
Published: April 2024

This article presents new discoveries from a manuscript from the Collegiate Church of St Chad, Shrewsbury, with implications for the circulation of ecclesiastical music, particularly sequences, in twelfth- and thirteenth-century England. It begins with a brief examination of the twelfth-century musical contents of the manuscript, which are shown to hold close scribal affinities: in particular, a ‘winged’ neume shape is contextualised by contemporaneous musical inscriptions found in a manuscript probably written at Haughmond Abbey. The remainder of the article considers music, mostly sequences, inscribed in a palimpsest gathering at the back of the St Chad's manuscript in the thirteenth century. Two of these are compared for the first time with their concordances, one concordance newly discovered. Examination of the preservation and record of these musical entries (with discussion of contrafacture and marginalia) sheds light on creative practices of citation and intertextuality, performance traditions, and processes of reading and recording music at St Chad's, ultimately illuminating the role the church played within a creative network across England and northern Europe.
Long-term global longitudinal strain abnormalities in paediatric patients after multisystem inflammatory syndrome in children correlate with cardiac troponin T: a single-centre cohort study
Authors: Netea Stejara A. , Biesbroek Giske , Groenink Maarten , Planken R.N. (Nils) , de Winter Robbert J. ,   Kawasaki Study Group, Blom Nico A. , Kuijpers Taco W. , Kuipers Irene M.
Published: April 2024

Background:

Multisystem inflammatory syndrome in children is an inflammatory syndrome related to severe acute respiratory syndrome coronavirus 2 with a high risk of cardiovascular complications (vasoplegia, cardiac shock). We investigated the cardiac outcomes in multisystem inflammatory syndrome in children, focusing on the identification of predictors for late cardiac function impairment.

Methods:

Clinical characteristics, conventional echocardiography (left ventricle ejection fraction, fractional shortening), 4-chamber left ventricular global longitudinal strain, and cardiac MRI of multisystem inflammatory syndrome in children patients (n = 48) were collected during admission, 6 weeks, 6 months, >12–≤18 months, and >18–≤24 months post-onset. Paired over-time patterns were assessed and multivariable regression analyses were performed to identify predictors for late global longitudinal strain impairment.

Results:

In total, 81.3% of patients had acute cardiac dysfunction (left ventricle ejection fraction <50% and/or fractional shortening <28%). The left ventricle ejection fraction and fractional shortening reached a plateau level ≤6 weeks, while the global longitudinal strain continued to decrease in the first 6 months post-onset (median –17.3%, P < 0.001 [versus acute]). At 6 months, 35.7% of the patients still had an abnormal global longitudinal strain, which persisted in 5/9 patients that underwent echocardiography >12–≤18 months post-onset and in 3/3 patients >18–≤24 months post-onset. In a multivariable analysis, soluble troponin T (>62.0 ng/L [median]) was associated with reduced global longitudinal strain at 6 months. Our cardiac MRI findings indicated acute myocardial involvement (increased T1/T2 value) in 77.8% (7/9), which recovered quickly without signs of fibrosis on convalescent cardiac MRIs.

Conclusions:

Late global longitudinal strain impairment is seen in some multisystem inflammatory syndrome in children patients up to one-year post-onset. Careful cardiac follow-up in patients with elevated troponin in the acute phase and patients with persistent abnormal global longitudinal strain is warranted until resolution of the global longitudinal strain since the long-term implications of such abnormalities are still unclear.
Evaluation of cardiac functions in children with familial Mediterranean fever
Authors: Yildirim Arslan Sema , Gurses Dolunay , Yuksel Selcuk
Published: April 2024

Objectives:

Familial Mediterranean fever is an autosomal recessive autoinflammatory inherited disease. We aimed to evaluate cardiac involvement in children with familial Mediterranean fever during the attack-free period.

Material and Methods:

The prospective study included 75 familial Mediterranean fever patients during the attack-free period and 50 healthy children. Cardiac evaluation was performed using electrocardiography, 24-hour ambulatory Holter monitoring, and conventional and tissue Doppler echocardiography. Aortic stiffness indices were calculated.

Results:

There were no differences between the groups in age, height, sex, body mass index, and arterial blood pressure parameters (p > 0.05). QT and corrected QT dispersion parameters were similar in both groups (p > 0.05). The E wave velocity and the E/A ratio of the mitral and tricuspid valves decreased, and the A wave velocity of the tricuspid and mitral valve increased in familial Mediterranean fever by the Doppler echocardiography (p < 0.05). The myocardial contraction velocities (Sd), early relaxation velocity (Ed), and Ed/late relaxation velocity (Ad) of both ventricles were decreased in familial Mediterranean fever group, whereas the Ad of both ventricles and the interventricular septum was increased in familial Mediterranean fever group. Aortic strain and distensibility were decreased, and pressure strain elastic modules (Ep), pressure strain normalised (Ep*) by diastolic pressure, and aortic stiffness β index were increased in familial Mediterranean fever patients (p < 0.05). When time domain heart rate variability parameters were evaluated, SDNN-i, RMSSD, and PNN50 significantly decreased in familial Mediterranean fever patients (p < 0.05), whereas SDNN and SDANN were similar in both groups (p > 0.05).

Conclusion:

Our findings showed that cardiac involvement could exist in familial Mediterranean fever patients, even during nonattack periods.
Individualised surgical treatment strategy for subaortic stenosis
Authors: Wang Zhangwei , Ma Kai , Zhu Yaobin , Li Zhiqiang , Li Shoujun
Published: April 2024

Objectives:

The clinical data of patients with subaortic stenosis who underwent surgical treatment in our centre in the past 12 years were reviewed. The short-term and long-term clinical outcomes were analyzed, and the long-term outcomes of different surgical methods for subaortic stenosis were compared to determine the optimal surgical treatment strategy for subaortic stenosis.

Methods:

From December 2010 to December 2022, 90 patients undergoing surgical treatment for subaortic stenosis in our hospital were enrolled. There were 55 males and 35 females with a median age of 72 (46,132) months and an average surgical weight of (21.35 ± 15.84) kg. According to the operation method, 90 patients were divided into group A (50 patients with simple subaortic membrane resection) and group B (40 patients with subaortic membrane and muscle resection or modified Konno procedure).

Results:

There were three early deaths (3.33%). One late death occurred in group B. There was no significant difference in long-term survival rate between the two groups (p = 0.904). The preoperative left ventricular outflow tract pressure gradient in group B was (91.56 ± 36.98) mm Hg, which was higher than that in group A(51.13 ± 36.04)mm Hg(p < 0.001). There was no significant difference in immediate postoperative left ventricular outflow tract pressure gradient between group B [(5.44 ± 8.43) mm Hg] and group A [(7.82 ± 13.44) mm Hg] (p = 0.343). In the long-term follow-up, left ventricular outflow tract pressure gradient in group B was (5.86 ± 9.53) mm Hg, which was not statistically significant compared with group A (8.83 ± 14.52) mm Hg (p = 0.294). Eleven patients with moderate or greater aortic regurgitation (group A/group B: 3/8) underwent simultaneous aortic valvuloplasty. In group B, moderate or greater aortic regurgitation was significantly improved immediately after operation (p = 0.013) and was not significantly aggravated in long-term follow-up (p = 0.083), and there was no significant improvement in group A after operation and long-term follow-up.

Conclusions:

According to the different anatomical lesions of left ventricular outflow tract, the individualised surgical treatment strategy for patients with subaortic stenosis can achieve good long-term outcomes. The long-term survival rate and freedom from reoperation due to late left ventricular outflow tract obstruction after simple subaortic membrane resection and extended left ventricular outflow tract resection are comparable. For patients with moderate or greater aortic regurgitation before extended left ventricular outflow tract resection, simultaneous aortic valvuloplasty is beneficial to improve postoperative aortic valve function.
Clinical outcomes for sexual and gender minority adolescents in a dialectical behaviour therapy programme
Authors: Camp J. , Durante G. , Cooper A. , Smith P. , Rimes K. A.
Published: April 2024

Background:

Sexuality and gender minoritised (SGM) adolescents are at increased risk of self-injury and suicide, and experience barriers to accessing mental health support. Dialectical behaviour therapy (DBT) is an effective treatment for self-injury and emotion dysregulation in adolescent populations, but few studies have published outcomes of DBT for SGM young people.

Aims:

This study aimed to investigate treatment outcomes and completion for SGM adolescents and their cisgender and heterosexual peers, in the National & Specialist CAMHS, DBT service (UK).

Method:

Treatment completion, and opting out before and during treatment were examined for sexual and gender identity groups, as well as changes by the end of treatment in emotion dysregulation, self-injury, in-patient bed-days, emergency department attendances, and borderline personality disorder, depression and anxiety symptoms.

Results:

SGM adolescents were over-represented in this service, even after considering their increased risk for self-injury. No statistically significant differences were found for treatment completion between the sexual orientation and gender identity groups, although there were patterns indicating possible lower treatment uptake and completion that warrant further investigation. Clinical outcomes for treatment-completers showed improvement by the end of DBT for each group, with few exceptions.

Discussion:

These results are from relatively small subsamples, and it was not possible to separate by sex assigned at birth. Findings should be treated tentatively and as early indications of effect sizes to inform future studies. This study suggests that DBT could be a useful treatment for SGM adolescents in a highly specialist treatment setting.
“You’re the only thing he comes out [of his room] for”: A qualitative study of engagement between Laughter Care Specialists and families of people with dementia in long-term care
Authors: DiGiacomo Michelle , Roberts Sara-Jane , Luckett Tim , Symons David , Ellis Georgia , Kochovska Slavica , Warner Tony , Currow David C. , Parker Deborah , Payne Karey , Agar Meera R.
Published: April 2024

Objectives

Family involvement in the lives of people who have dementia and live in long-term care is important, but family members may face challenges communicating and connecting with their loved one as dementia progresses. A type of therapeutic humor (Laughter Care) delivered by trained specialists aims to engage people with dementia who reside in long-term care through creative play and laughter. This study aimed to explore the perceptions of Laughter Care Specialists (LCSs) regarding families’ engagement with the program.

Methods

Semi-structured interviews were conducted with LCSs (n = 8) and analyzed inductively using thematic analysis.

Results

Family members were reported to initially have varied degrees of openness toward Laughter Care, but often become more accepting after observing positive engagement with the person with dementia. Family members were perceived to benefit from the program through witnessing the person with dementia enjoy joyous and light interactions, learn new ways of communicating and connecting with the person with dementia, and engage in positive interactions at end of life.

Significance of results

Laughter Care may provide family members with novel ways of communicating and connecting with people who have dementia at end of life as well as comfort into bereavement.
Business history without business: intermediation and China's pre-1949 cattle trade
Authors: DuBois Thomas David , Liu Qinli , Sun Yan
Published: April 2024

China's cattle trade before 1949 is effectively invisible to historians. With no geographic center, few dominant firms, and little government oversight, cattle trade left behind no clear archive of sources, leaving scholars to the mercy of conjecture and episodic evidence. Combining insights from business and social history, we focused our attention on trade intermediation as the key to understanding the operations of a diffuse trade system. In the absence of a top–down archive, we composited hundreds of local sources on intermediation in cattle trade and remotely interviewed 80 former brokers. These sources revealed large numbers of individuated trade routes, which we break into three types: persistent supply, specialized demand, and resource circulation. Each type of trade called for distinct forms of intermediation with relatively little overlap between specialized networks. This recreation of China's cattle trade reveals a sophisticated market for animal labor that calls into question the direct causal link between imperialist resource extraction and rural immiseration, and suggests the utility of applying tools and perspectives of social history to other sorts of decentered commercial systems.
Absorptive reconfigurable bandstop filter with ultra-wide frequency tuning range using distributed lossy resonators
Authors: Li Qun
Published: April 2024

An absorptive reconfigurable bandstop filter (BSF) with compact size and ultra-wide frequency tuning range using distributed lossy resonators is presented. In each reconfigurable bandstop resonator, a varactor and a PIN diode are utilized as the control and absorption devices. When the PIN diodes are in off and on states, the upper and lower frequency tuning ranges of stopbands can be obtained, respectively. Therefore, the ultra-wide total frequency tuning range which is the combination of the upper and lower frequency tuning ranges can be realized. Meanwhile, the stopband frequency and bandwidth tuning can be independently controlled by bias voltages. The resistances in the varactors and PIN diodes can dissipate the electromagnetic power and thus result in absorptive stopband without using extra absorptive circuits. The stopband suppression level and stopband absorption ratio are proportional to the number of distributed lossy resonators. For demonstration, an absorptive reconfigurable BSF prototype using six pairs of distributed lossy resonators is designed and fabricated. The measured total frequency tuning range is 3.03–6.39 GHz (71%) with the suppression level of 20 dB, while the frequency tuning range with the suppression level of 10 dB is 2.04–6.39 GHz (103%).
Temporal Seismic Velocity Changes Associated With the Mw 6.1, May 2008 Ölfus Doublet, South Iceland: A Joint Interpretation From dv/v and GPS
Authors: Çubuk‐Sabuncu Yeşim , Jónsdóttir Kristín , Árnadóttir Thóra , Mordret Aurélien , Caudron Corentin , Lecocq Thomas , De Plaen Raphael
Published: April 2024

In South Iceland, populated and agricultural areas are at risk of earthquakes due to their location within the South Iceland Seismic Zone (SISZ). In 2008, two moderate‐sized earthquakes (M5.8 and M5.9) occurred in Ölfus, the western end of this highly active transform zone. We analyze temporal seismic velocity variations (dv/v) related to the Ölfus earthquake doublet, using cross‐correlations of ambient noise in the frequency range of 0.1–3.0 Hz. The two mainshocks decrease the average velocity by 0.8% at the nearest stations. The co‐seismic changes are most noticeable from 0.7 to 1.7 Hz and affect a 40 km wide region. We present a first‐time comparison of dv/v to crustal deformation, seismicity, co‐seismic volumetric stress changes and reported PGA distribution for the Ölfus doublet. Ground accelerations caused by mainshocks at intermediate distances suggest that strong shaking‐related damage may contribute to the co‐seismic dv/v decrease. A rapid velocity increase (0.3%) in a month after the co‐seismic drop indicates crustal rock healing. We find 3‐months of post‐seismic decorrelation, followed by a nearly permanent velocity decrease (0.2%) confined to a shallow layer (1 km) until the end of the observation period. Afterslip and pore fluid effects in the near‐source region are likely to influence post‐seismic dv/v. We demonstrate that seismic interferometry can contribute to future fault‐zone monitoring operations in the SISZ by detecting small changes in velocity.
CO2 Flushing Triggers Paroxysmal Eruptions at Open Conduit Basaltic Volcanoes
Authors: Caricchi Luca , Montagna Chiara P. , Aiuppa Alessandro , Lages Joao , Tamburello Giancarlo , Papale Paolo
Published: April 2024

Open conduit volcanoes erupt with the highest frequency on Earth. Their activity is characterized by an outgassing flux that largely exceeds the gas that could be released by the erupted magma; and by frequent small explosions intercalated by larger events that pose a significant risk to locals, tourists, and scientists. Thus, identifying the signs of an impending larger explosion is of utmost importance for the mitigation of volcanic hazard. Larger explosive events have been associated with the sudden ascent of volatile rich magmas, however, where and why magma accumulates within the plumbing system remains unclear. Here we show that the interaction between CO2‐rich fluids and magma spontaneously leads to the accumulation of volatile‐rich, low density and gravitationally unstable magma at depth, without the requirement of permeability barriers. CO2‐flushing forces the exsolution of water and the increase of magma viscosity, which proceeds from the bottom of the magma column upward. This rheological configuration unavoidably leads to the progressive thickening of a gas‐rich and low density (i.e., gravitationally unstable) layer at the bottom of the feeding system. Our calculations account for observations, gas monitoring and petrological data; moreover, they provide a basis to trace the approach to deeply triggered large or paroxysmal eruptions and estimate their size from monitoring data. Our model is finally applied to Stromboli volcano, an emblematic example of open conduit volcano, but can be applied to any other open conduit volcano globally and offers a framework to anticipate the occurrence of unexpectedly large eruptions.
The Effect of Physically Based Ice Radiative Processes on Greenland Ice Sheet Albedo and Surface Mass Balance in E3SM
Authors: Whicker‐Clarke C. A. , Antwerpen R. , Flanner M. G. , Schneider A. , Tedesco M. , Zender C. S.
Published: April 2024

A significant portion of surface melt on the Greenland Ice Sheet (GrIS) is due to dark ice regions in the ablation zone, where solar absorption is influenced by the physical properties of the ice, light absorbing constituents (LACs), and the overlying crustal surface or melt ponds. Earth system models (ESMs) typically prescribe the albedo of ice surfaces as a constant value in the visible and near‐infrared spectral regions. This work advances ESM ice radiative transfer modeling by (a) incorporating a physically based radiative transfer model (SNow, ICe and Aerosol Radiation model Adding‐Doubling Version 4; SNICAR‐ADv4) into the Energy Exascale Earth System Model (E3SM), (b) determining spatially and temporally varying bare ice physical properties over the GrIS ablation zone from satellite observations to inform SNICAR‐ADv4, and (c) assessing the impacts on simulated GrIS albedo and surface mass balance associated with modeling of more realistic bare ice albedo. GrIS‐wide bare ice albedo in E3SMv2 is overestimated by ∼4% in the visible and ∼7% in the near‐infrared wavelengths compared to the Moderate Resolution Imaging Spectroradiometer. Our bare ice physical property retrieval method found that LACs, ice crustal surfaces, and melt ponds reduce visible albedo by 30% in the bare ice region of the GrIS ablation zone. The realistic bare ice albedo reduces surface mass balance by ∼145 Gt, or 0.4 mm of sea‐level equivalent between 2000 and 2021 compared to the default E3SM. This work highlights the importance of simulating bare ice albedo accurately and realistically to improve our ability to quantify changes in the GrIS surface mass and radiative energy budgets.
The Rotational and Divergent Kinetic Energy Spectra of Geostrophic Vortices and Inertia‐Gravity Waves
Authors: Zhang Wei , Peng Jun , Zhang Weimin , Li Zongheng , Wu Hanyan
Published: April 2024

The rotational and divergent kinetic energy (RKE and DKE) spectra of geostrophic vortices (Rossby waves; RWs) and inertia‐gravity waves (IGWs) in the global atmosphere are investigated with ERA5 reanalysis. The separation of RWs and IGWs in physical space is based on the normal‐mode decomposition, and the Helmholtz decomposition produces their RKE and DKE spectra at different layers, with a focus on spherical wavenumbers 10 ≤ l ≤ 100. In the upper troposphere and the middle and lower stratosphere, the RKE spectra of the total mode closely resemble the horizontal kinetic energy (HKE) spectra of RWs over most wavenumbers; the DKE spectra of the total mode are more comparable to the DKE spectra rather than the HKE spectra of IGWs, although their slopes are similar. The HKE of RWs is dominated by its rotational component, accounting for more than 80% of the HKE in most ranges of concern. Although the HKE of IGWs is dominated by its divergent component, its rotation component is also significant, with an average percentage exceeding 25% in all three vertical layers analyzed. Care must be taken when employing divergence as a proxy of IGWs, as the DKE may underestimate the HKE of IGWs. With the increase of altitude and the decrease of scale, the contribution of the divergent component increases in the horizontal circulation of both RWs and IGWs.
Heritability of complex traits in sub-populations experiencing bottlenecks and growth
Authors: Taylor Cameron S. , Lawson Daniel J.
Published: April 2024

Populations that have experienced a bottleneck are regularly used in Genome Wide Association Studies (GWAS) to investigate variants associated with complex traits. It is generally understood that these isolated sub-populations may experience high frequency of otherwise rare variants with large effect size, and therefore provide a unique opportunity to study said trait. However, the demographic history of the population under investigation affects all SNPs that determine the complex trait genome-wide, changing its heritability and genetic architecture. We use a simulation based approach to identify the impact of the demographic processes of drift, expansion, and migration on the heritability of complex trait. We show that demography has considerable impact on complex traits. We then investigate the power to resolve heritability of complex traits in GWAS studies subjected to demographic effects. We find that demography is an important component for interpreting inference of complex traits and has a nuanced impact on the power of GWAS. We conclude that demographic histories need to be explicitly modelled to properly quantify the history of selection on a complex trait.
The evolution of robotics: research and application progress of dental implant robotic systems
Authors: Liu Chen , Liu Yuchen , Xie Rui , Li Zhiwen , Bai Shizhu , Zhao Yimin
Published: April 2024

The use of robots to augment human capabilities and assist in work has long been an aspiration. Robotics has been developing since the 1960s when the first industrial robot was introduced. As technology has advanced, robotic-assisted surgery has shown numerous advantages, including more precision, efficiency, minimal invasiveness, and safety than is possible with conventional techniques, which are research hotspots and cutting-edge trends. This article reviewed the history of medical robot development and seminal research papers about current research progress. Taking the autonomous dental implant robotic system as an example, the advantages and prospects of medical robotic systems would be discussed which would provide a reference for future research.
A wideband, high-resolution vector spectrum analyzer for integrated photonics
Authors: Luo Yi-Han , Shi Baoqi , Sun Wei , Chen Ruiyang , Huang Sanli , Wang Zhongkai , Long Jinbao , Shen Chen , Ye Zhichao , Guo Hairun , Liu Junqiu
Published: April 2024

The analysis of optical spectra—emission or absorption—has been arguably the most powerful approach for discovering and understanding matter. The invention and development of many kinds of spectrometers have equipped us with versatile yet ultra-sensitive diagnostic tools for trace gas detection, isotope analysis, and resolving hyperfine structures of atoms and molecules. With proliferating data and information, urgent and demanding requirements have been placed today on spectrum analysis with ever-increasing spectral bandwidth and frequency resolution. These requirements are especially stringent for broadband laser sources that carry massive information and for dispersive devices used in information processing systems. In addition, spectrum analyzers are expected to probe the device’s phase response where extra information is encoded. Here we demonstrate a novel vector spectrum analyzer (VSA) that is capable of characterizing passive devices and active laser sources in one setup. Such a dual-mode VSA can measure loss, phase response, and dispersion properties of passive devices. It also can coherently map a broadband laser spectrum into the RF domain. The VSA features a bandwidth of 55.1 THz (1260–1640 nm), a frequency resolution of 471 kHz, and a dynamic range of 56 dB. Meanwhile, our fiber-based VSA is compact and robust. It requires neither high-speed modulators and photodetectors nor any active feedback control. Finally, we employ our VSA for applications including characterization of integrated dispersive waveguides, mapping frequency comb spectra, and coherent light detection and ranging (LiDAR). Our VSA presents an innovative approach for device analysis and laser spectroscopy, and can play a critical role in future photonic systems and applications for sensing, communication, imaging, and quantum information processing.
Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch
Authors: Huang Kai , Jin Zhan , Nakanii Nobuhiko , Hosokai Tomonao , Kando Masaki
Published: April 2024

Laser wakefield acceleration, as an advanced accelerator concept, has attracted great attentions for its ultrahigh acceleration gradient and the capability to produce high brightness electron bunches. The three-dimensional (3D) density serves as an evaluation metric for the particle bunch quality and is intrinsically related to the applications of an accelerator. Despite its significance, this parameter has not been experimentally measured in the investigation of laser wakefield acceleration. We report on an electro-optic 3D snapshot of a laser wakefield electron bunch at a position outside the plasma. The 3D shape of the electron bunch was detected by simultaneously performing optical transition radiation imaging and electro-optic sampling. Detailed 3D structures to a few micrometer levels were reconstructed using a genetic algorithm. The electron bunch possessed a transverse size of less than 30 micrometers. The current profile shows a multi-peak structure. The main peak had a duration of < 10 fs and a peak current > 1 kA. The maximum electron 3D number density was ~ 9 × 1021 m-3. This research demonstrates a feasible way of 3D density monitoring on femtosecond kilo-ampere electron bunches, at any position of a beam transport line for relevant applications.
A laser-engraved wearable gait recognition sensor system for exoskeleton robots
Authors: Sun Maowen , Cui Songya , Wang Zezheng , Luo Huayu , Yang Huayong , Ouyang Xiaoping , Xu Kaichen
Published: April 2024

As a reinforcement technology that improves load-bearing ability and prevents injuries, assisted exoskeleton robots have extensive applications in freight transport and health care. The perception of gait information by such robots is vital for their control. This information is the basis for motion planning in assistive and collaborative functions. Here, a wearable gait recognition sensor system for exoskeleton robots is presented. Pressure sensor arrays based on laser-induced graphene are developed with flexibility and reliability. Multiple sensor units are integrated into an insole to detect real-time pressure at key plantar positions. In addition, the circuit hardware and the algorithm are designed to reinforce the sensor system with the capability of gait recognition. The experimental results show that the accuracy of gait recognition by the proposed system is 99.85%, and the effectiveness of the system is further verified through testing on an exoskeleton robot.