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The recovery of subaltern experiences in colonial contexts requires more than reading against the grain and interrogating silences. This paper describes “archival patchwork,” a way of working across diverse sources from multiple repositories, collecting small scraps of evidence about subordinated individuals, reconstructing social relationships, and stitching together patterns of daily life that aren’t visible otherwise. Archival patchwork accommodates present-day ways of working in neoliberal universities, acknowledges north-south disparities, and opens collaborative possibilities. The paper, pinned to South African history, enumerates digitization, transcription, and duplication projects that make archival sources for the colonial Cape more widely available. Although this paper’s evidence is focused in time and place, the methodology is broadly applicable.
Scimitar syndrome is characterised by anomalous right pulmonary venous drainage to the inferior vena cava associated with right pulmonary artery hypoplasia. We present a case of an infant with Scimitar syndrome with a well-formed right pulmonary artery, in high Qp heart failure who was managed with right pulmonary artery banding after thorough haemodynamic evaluation.
The green tree python is quite a favorite pet for sale on the international market. The species is therefore protected by the Convention on International Trade in Endangered Species of Wild Flora and Fauna (CITES). Since the illegal poaching of large numbers of specimens in the wild might lead to the detriment of native populations, and wildlife breeding farms were found to be serving as conduits to funnel wild-caught green tree pythons out of Indonesia, a forensic tool to distinguish wild-caught from captive-bred specimens could support the enforcement of CITES protections. To disrupt the illegal trade of green tree pythons, we have developed an effective tool to distinguish the animals supposedly bred in captivity from those caught in the wild, based on the strontium isotope composition in conjunction with trace element data. Like in human hair, 87Sr/86Sr values seem to vary according to the relative contribution of endogenous and exogenous sources. Thus, we infer that if there is enough sustainable strontium available for the analysis, it might be possible to use the 87Sr/86Sr values in parallel with trace elements to distinguish wild-originated specimens from the in captivity-bred ones. Indeed, our pilot study on the shed skins of animals where the geographic origin was either the Czech Republic or Indonesia, confirms that shed skins can be effectively used for further forensic Sr radiogenic isotope analyses.
We investigate interactions between two like-signed vortices over either an isolated seamount or a basin (a depression in the bathymetry), using a quasi-geostrophic, two-layer model on the $f$-plane. When the vortex pair is centred over the seamount, the vortices are pushed together by the secondary flow generated in the bottom layer, facilitating their merger. Over a basin, the deep anomalies are much stronger and their interaction strains out the surface vortices. The results are supported by an analytical estimation of the initial potential vorticity anomalies in the lower layer and by analysis of the linear stability of a single vortex over the bathymetry. Similar phenomena are observed when the vortex pair is displaced from the bathymetric centre and when the initial vortices are initially compensated. Sub-deformation-scale vortices are less influenced by bathymetry than larger vortices. The results help explain asymmetries noted previously in turbulence simulations over bathymetry.
Rice water weevils (RWWs) (Lissorhoptrus oryzophilus) and rice weevils (RW) (Echinocnemus squameus) (both Coleoptera: Curculionidae) are major rice pests that cause significant economic losses in China. Understanding their potential distribution areas is crucial for effective management. This study used the Biomod2 package in R to simulate and predict the current and future potential distributions, changes in suitable areas, shifts in distribution centres, and overlaps under climate change for both pests under three greenhouse gas emission scenarios. By 2023, the suitable areas for RWWs and RWs were 538.52 × 104 km2 and 376.05 × 104 km2, respectively. The suitable area for the former pest expanded southwestward and northeastward across China, whereas the latter spread mainly into Northeast China. The suitable area for RWWs is projected to remain stable, whereas that for RWs is expected to decline. The distribution centroid of RWWs is anticipated to shift toward southeastern or southwestern Shaanxi, whereas RWs are likely to migrate toward central-eastern or northeastern Shaanxi. The niche overlap between the two pests is high (Schoener’s D = 0.658, I = 0.816), with overlap concentrated in central, eastern, and southern China. The key factors influencing their distributions include precipitation of the wettest month (Bio13), mean temperature of the warmest quarter (Bio10), and precipitation of the driest month (Bio14). This study provides a theoretical basis for the prediction of the potential distribution of both pests, which offers valuable insights for the development of effective pest control strategies in China.
In this paper, we report an on-wafer High-Electron-Mobility transistor characterization method over a large frequency band [250 MHz–1.1 THz]. The transistor’s coplanar accesses were optimized to enable high-frequency measurement of the devices up to 1.1 THz. The characterization method implements an on-wafer multiline Thru-Reflect-Line calibration kit fabricated on indium phosphide (InP) substrate validated using comparisons between simulations and measurements of coplanar waveguide (CPW) devices. An 80-nm gate length InAlAs/InGaAs/InAs InP-HEMT was fabricated using the optimized transistor accesses then it was measured over the [250 MHz–1.1 THz] frequency band using the developed on-wafer characterization method. It is important to mention that the same transistor was measured on six different on-wafer test benches [250 MHz–110 GHz], [140–220 GHz], [220–325 GHz], [325–480 GHz], [500–750 GHz], and [750–1100 GHz]. The S-parameter measurement results show good continuity between the six measured frequency bands. Observations on the extracted gain measurements and a comparison between the measured and [250 MHz–110 GHz] extrapolated cut-off frequencies are also provided.
In this paper, we demonstrate wideband orthogonal frequency division multiplexing (OFDM) at sub-mmW frequencies with full electronic data and carrier generation. We present the first stringent examination of OFDM-waveform design in a fully electronic experimental setup. Operating at 309 GHz center frequency and modulated channel bandwidths of 2 and 10 GHz, the performance of single-carrier waveforms is compared to OFDM signals with varying modulation formats and subcarrier settings. In addition to the investigation of the gross data rate, which is resulting in 20 Gbit/s for OFDM and 40 Gbit/s for single-carrier, we give one of the first demonstrations of joint communication and sensing with OFDM-signals at sub-mmW frequencies, as the distance between transmitter and receiver isdetermined by examination of the received signal.
If a body of inviscid fluid is disturbed, it will typically eject a jet of fluid. If the effects of gravity and surface tension are negligible, these jets travel in straight lines, with the tips approaching a constant velocity. Earlier works have concentrated upon jets which result from the occurrence of shocks or singularities in the fluid flow. In this paper, by contrast, we describe the simplest case, in two dimensions: an infinitely deep body of inviscid fluid, with no surface tension or gravitational forces acting, responds to a generic impulsive disturbance. We find that, contrary to some earlier suggestions, the jet has a hyperbolic profile (away from its tip and its base).
Existing approaches to quantitative epidemiologic methods commonly used in conflict and other emergency settings risk retraumatizing research participants. However, little guidance exists regarding how to mitigate these risks. Here we draw on literatures addressing ethical considerations in 2 similar activities—the use of qualitative research methodologies in research with survivors of violence and trauma, as well as witness protection strategies during tribunal proceedings. We recommend preliminary standards and best practices for participant protection from retraumatization associated with quantitative epidemiological methods adapted from existing practices for qualitative research and in tribunal contexts that should be refined in partnership with the affected communities.
The statistical relation of residual stress between averaged and filtered compressible flow, known as Reynolds stress in the Reynolds-averaged Navier–Stokes equation (RANS) and subgrid-scale (SGS) stress in a large eddy simulation (LES), serves a significant role in high-Reynolds-numbers wall-bounded turbulence modelling. However, existing residual stress relations are not universally applicable due to additional assumptions or variables not directly derived from compressible turbulence modelling. To establish an effective and accurate residual stress relation, a theoretical study accompanied by numerical verification has been carried out. By introducing a novel pair of average and filter operators with commutative properties, the statistical relations of residual stress for compressible flows are derived. Then, a realisation and verification of the stress relation is carried out within the finite volume method framework to facilitate the application of the proposed stress relation in engineering turbulence modelling. The reliability of the residual stress relation is confirmed using the compressible channel turbulence at various Mach numbers and compressible boundary layer flow. The stress relation formula effectively establishes the decomposition between Reynolds stress and subgrid-scale stress of the compressible flows. The proposed residual stress relation and filter operators may contribute to the compressible turbulence modelling, including the development of the wall model, SGS model and RANS/LES hybrid strategy for high-Reynolds-number turbulence modelling.
Photoconductive antennas (PCAs), known for their broad bandwidth, high data rates, and simple structure, are gaining significant attention in terahertz (THz) applications. Over the past decade, THz PCAs have been extensively researched, demonstrating diverse applications across multiple fields. This paper provides a comprehensive review of PCA theory and design, along with an in-depth analysis of their relative advantages. Additionally, various strategies for enhancing antenna efficiency are discussed, focusing on material selection and geometric design. This review aims to offer researchers a consolidated resource, presenting key insights into the challenges and advancements in PCA research.
Despite comments in the ELT literature on the importance of word-stress for comprehensibility in English, there are many places where native speakers of English appear to pay it little attention, showing systematic variation as well as errors. At the very least, there is a paradox here, in that learners are told to get a feature right that native speakers feel free to ignore. More detailed consideration, though, shows that matters are not as simple as this implies. In this paper, several types of stress variation in English are exemplified, and it is also shown that in everyday usage native English speakers are flexible in what they will accept where stress is concerned. This raises questions about the best model for teaching stress in English as a second or foreign language. A simple right/wrong dichotomy is unlikely to reflect native usage.
By eliminating spoken words and more novel musical and staging effects used in the original Ghost Opera, Tan Dun’s Concerto for String Quartet and Pipa offers an analytical opportunity to show how he uses more conventional musical techniques to depict an intercultural and personal ritual. Yet, studying Tan’s usage of borrowed musical elements illuminates the commonalities and irreconcilable differences between Eastern and Western sounds. The construction of such an intercultural soundscape nonetheless requires a distinction between Chinese and Western musical practices. The Chinese sounds used in this work are also mediated by the Chinese state or Tan himself from rural communities through modernist and Orientalist means, while Tan’s compositional approach remains centred on Western-based musical means. This shows Tan’s agency to both place Chinese peasant culture at the periphery and elevate such elements to high art for Western audiences.