Mamyshev oscillators (MOs) exhibit the potential for generating high average power and ultrashort pulses. Herein, we construct an MO using flexible double-cladding ytterbium-fiber with a fusion-spliced-combiner pumped scheme. Consistent with the most reported research results, the offset filter separation significantly affects the pulse characteristics (spectrum, pulse duration, etc.). Notably, in comparison with red-shifting, blue-shifting the peak spectral emission of the grating filter relative to a constant central wavelength of the bandpass filter substantially enhances the laser output characteristics. This phenomenon, which has not been previously reported, results in an average power up to 2.23 W and a pulse duration as short as 49 fs. To our knowledge, this is the highest average power achieved in sub-50 fs pulse duration in the nonlinear polarization rotation-assisted mode-locked MO laser architecture. The presented technique offers unique scientific proof for developing ultrafast laser sources with higher average power and shorter pulse duration.

In a cross-sectional study of L2 Danish, we examined the production of correct verb-second (V2) word order. We tested the effect of (1) the learners’ language background, (2) test level and (3) the length of the sentence constituents. The texts were written by 217 students (3 test levels (A2-B1), 52 different L1s). Interrogative clauses had high accuracy, but 25% of the 491 declarative sentences with non-initial subjects had incorrect V3 word order. Our study shows that V2 is not difficult for all learners. Learners whose L1 is a V2 language had a significantly higher share of correct V2 word order, and they never overused V2. For non-V2 learners, the share of correct V2 significantly increased with proficiency level. For constituent length, accuracy decreased significantly with the length of the first constituent and for subjects consisting of multiple words.

Subdwarf B stars are a well-known class of hot, low-mass stars thought to be formed through interactions in stellar binary systems. While different formation channels for subdwarf B stars have been studied through a binary population synthesis approach, it has also become evident that the characteristics of the found populations depend on the initial set of assumptions that describe the sometimes poorly constrained physical processes, such as common envelope episodes or angular momentum loss during mass transfer events. In this work we present a parameter study of subdwarf B populations, including a novel analytic prescription that approximates the evolution of subdwarf B stars with hydrogen-rich outer shells, an element previously overlooked in rapid binary population synthesis. We find that all studied parameters strongly impact the properties of the population, with the possibility of igniting helium below the expected core-mass value near the tip of the red giant branch strongly affecting the total number of subdwarf B candidates. Critically, our newly proposed prescription for the evolution of subdwarf B stars with hydrogen-shells helps to reconcile theoretical predictions of surface gravity and effective temperature with observational results. Our prescription is useful in the context of rapid binary population synthesis studies and can be applied to other rapid binary population synthesis codes’ output.

There is evidence to suggest that the effects of bilingualism on executive functions (EFs) need to be examined along a continuum rather than a dichotomy. The present study addressed this need by examining the influence of different bilingual experiences on executive functioning using a Flanker and Stroop mouse-tracking task that taps into more dynamic cognitive processes than typical behavioral paradigms. We sampled 98 bilingual young adults and investigated conflict and sequential congruency effects (SCEs). We found that mouse-tracking metrics captured links that were not identified with overall reaction times. SCEs were more sensitive to detecting relations between L2 experiences and EF than simple conflict effects. Second-language age of acquisition and L1/L2 switching frequency consistently predicted EF outcomes. This association was moderated by the attentional demands of the task. These findings highlight the complexity of the effects of bilingualism on cognition, and the use of more sensitive measures to capture these effects.

How do citizens want to be represented in politics? We investigate citizens’ multidimensional preferences regarding six conceptions of representation that are derived from political theory. Using original item batteries and a conjoint experiment, we elicit the relative importance of the dimensions and the types of representation people prefer on each dimension. Our results from surveys fielded in the United States, the United Kingdom, and Germany show that 1) descriptive representation has comparatively limited appeal for citizens at large, but is more important for historically marginalized groups; 2) citizens do not focus on local politicians when thinking about who represents them, but also seek representation from politicians in other districts; 3) while citizens strongly value substantive representation, they are largely indifferent as to whether their representatives are responsive to electoral sanctions. Our findings have important implications for how political scientists study democratic representation.

The aim of this paper is to characterise the internal structures and ice-flow history of representative valley glaciers in Svalbard and infer from them dynamic changes over centennial timescales. Three polythermal and one cold valley glacier are investigated using field- and laboratory-based techniques and remote sensing. Structures along flow-unit boundaries indicate that ice-flow configuration in three of the glaciers has remained stable spanning the residence time of the ice. Deformation of a flow-unit boundary in the fourth reveals an ice-flow instability, albeit one that has been maintained since its most recent advance. Macro-crystallographic, sedimentological and isotopic analyses indicate that basal ice is elevated to the glacier surface, as shown by entrained sediments and enrichment in heavy isotopes. In narrow zones of enhanced cumulative strain, new ice facies are generated through dynamic recrystallisation. The surface density of longitudinal foliation is shown to represent the relative magnitude of cumulative strain. Geometric similarities between flow-unit boundaries in Svalbard valley glaciers and larger scale longitudinal surface structures in ice sheets suggest that deformation mechanisms are common to both.

The ability to control international flows of information constitutes one of the core elements of the soft power of any modern state aspiring to exercise some level of regional or global hegemony. This phenomenon has been previously examined by those who study long-distance communications mainly in the context of the nineteenth-century telegraph or the twentieth-century broadcast. However, inquiries focusing on the analogous historical role performed by the postal service during the early modern era are much more scarce. Building upon this premise, this study examines the strategic advantages gained by the Republic of Venice through its control of the mail exchange between Europe and the Middle East – a de facto postal monopoly established during the sixteenth century. Venice deliberately subsidized this service in order to prevent the rise of potential competition. Despite the substantial cost, this was seen as an effective investment through which the republic gained a set of tangible strategic advantages. In particular, it helped to extend Venice’s relevance on the European political scene long past the point when its traditional political, economic, and naval–military power was already fading away.

A calcium-silicate xenolith (no. 11) from the ignimbrite of the Upper Chegem Caldera in Kabardino-Balkaria, Russia, has revealed a diverse mineral assemblage with As- and B-bearing phases from the apatite supergroup such as the svabite and johnbaumite–hydroxylellestadite series, in addition to cahnite and datolite. Three distinct zones of variable arsenic content have been investigated. Notably, the outermost altered zone adjacent to the ignimbrite hosts the highest concentration of arsenic and arsenate minerals. A detailed structural analysis using Raman spectroscopy was carried out to investigate the distribution of boron and arsenic in tetrahedral coordination. This has provided the basis for describing a solid-solution system between hydroxylellestadite, svabite and johnbaumite and can be used as a novel technique for identifying apatite-supergroup minerals. One aim of the analysis was to elucidate the origin of various elements and content levels, particularly in relation to the distance from the xenolith–ignimbrite contact. The presence of boron and arsenic, probably derived from ignimbrites, highlights the important role of volcanic rocks as potential contributors of these elements in mineral formation processes.

One of the most popular instruments used to assess perceived social support is the Multidimensional Scale of Perceived Social Support (MSPSS). Although the original structure of the MSPSS was defined to include three specific factors (significant others, friends and family), studies in the literature propose different factor solutions. In this study, we addressed the controversial factor structure of the MSPSS using a meta-analytic confirmatory factor analysis approach. For this purpose, we utilized studies in the literature that examined and reported the internal structure of the MSPSS. However, we used summary data from 59 samples of 54 studies (total N = 27,905) after excluding studies that did not meet the inclusion criteria. We tested five different models discussed in the literature and found that the fit indices of the correlated 3-factor model and the bifactor model were quite good. Therefore, we also examined both models’ factor loadings and omega coefficients. Since there was no sharp difference between the two models and the theoretical structure of the scale was represented by the correlated three factors, we decided that the correlated three-factor model was more appropriate for the internal structure of the MSPSS. We then examined the measurement invariance for this model according to language and sample type (clinical and nonclinical) and found that metric invariance was achieved. As a result, we found that the three-factor structure of the MSPSS was supported in this study.

This article tells the story of 36 Chinese peasants and their audacious campaign to defend their private rights on two tiny islands in Manchuria from the Japanese empire and a Chinese warlord regime. A borderland in Northeast Asia, Manchuria was a site of intense inter-imperial rivalry in the first half of the twentieth century. Using newly discovered local Chinese archival documents as well as sources produced by Japanese, Korean, and American actors, I discuss how the peasants leveraged their knowledge of multiple property regimes in the borderland to delay and deflect the demands of two states. This microhistory of a transnational dispute illustrates the workings of a form of convergent legal pluralism in the Northeast Asian borderland. While historians agree that state capacity grew substantially in the East Asian borderlands in the early twentieth century, the case shows how that growth also complicated the nature of the state and created new possibilities of bottom-up socio-legal action. It exemplifies the kind of legal cosmopolitanism grassroots actors practised in a world of justice dominated by not-so-cosmopolitan nation-states.