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The Tupí linguistic group is one of the most widespread in South America, indicating a deep history of population movement, yet the ancestral homeland and migration routes of descendant groups remain the subject of debate due to the fragmentary nature of the Amazonian archaeological record. Using a database of more than 660 georeferenced dates from sites of the Tupinambá and Guaraní peoples, the authors deploy a mobility model to investigate the timing of population movements, viable routes and the distances achieved. The results create a more nuanced understanding of the rhythms of migration through an ecologically and socially complex landscape.
We consider the conceptual two-layered oscillating tank of Inoue & Smyth (2009 J. Phys. Oceanogr. vol. 39, no. 5, pp. 1150–1166), which mimics the time-periodic parallel shear flow generated by low-frequency (e.g. semi-diurnal tides) and small-angle oscillations of the density interface. Such self-induced shear of an oscillating pycnocline may provide an alternate pathway to pycnocline turbulence and diapycnal mixing in addition to the turbulence and mixing driven by wind-induced shear of the surface mixed layer. We theoretically investigate shear instabilities arising in the inviscid two-layered oscillating tank configuration and show that the equation governing the evolution of linear perturbations on the density interface is a Schrödinger-type ordinary differential equation with a periodic potential. The necessary and sufficient stability condition is governed by a non-dimensional parameter $\beta$ resembling the inverse Richardson number; for two layers of equal thickness, instability arises when $\beta \,{\gt}\,1/4$. When this condition is satisfied, the flow is initially stable but finally tunnels into the unstable region after reaching the time marking the turning point. Once unstable, perturbations grow exponentially and reveal characteristics of Kelvin–Helmholtz (KH) instability. The modified Airy function method, which is an improved variant of the Wentzel–Kramers–Brillouin theory, is implemented to obtain a uniformly valid, composite approximate solution to the interface evolution. Next, we analyse the fully nonlinear stages of interface evolution by modifying the circulation evolution equation in the standard vortex blob method, which reveals that the interface rolls up into KH billows. Finally, we undertake real case studies of Lake Geneva and Chesapeake Bay to provide a physical perspective.
This experiment assessed the effects of adding hemp (seeds or hay) and stevia by-products to dairy cow diets on milk yield and on the fatty acid profile and oxidative stability of the milk. Additional analyses included composition, total phenolic content and total antioxidant capacity of milk samples as well as blood serum parameters. Thirty-five Holstein dairy cows were involved for 60 days, divided into five groups: control, hemp seed, hemp hay, stevia and a combination of hemp seeds and stevia leaves. No significant changes were observed in milk yield or composition. While monounsaturated fatty acid (MUFA) content did not differ significantly between control and experimental diets, milk from cows fed hemp seeds had higher MUFA compared to those fed hemp hay. Further research is recommended to determine the optimal proportion of these by-products in cow diets.
Frailty in older adults with cancer is complex, evolving, and often overlooked in care. This qualitative study explored how frailty is experienced and reported using patient-reported outcome measures (PROMs) and visualized over time through journey maps. Eleven participants (65+) completed the Comprehensive Frailty Assessment Instrument (CFAI) and semi-structured interviews. Individual journey maps combined CFAI scores with personal narratives to track changes in physical, mental, and social aspects of frailty over time. While PROMs showed variability in frailty severity, narratives revealed discrepancies, such as low frailty scores despite significant treatment-related challenges. Fatigue, emotional distress, and isolation were common during treatment, with lasting impacts post-treatment. Findings suggest PROMs alone may not fully capture lived experience. Integrating narrative dialogue provides a more person-centred approach to frailty assessment and care planning.
The description of the existence conditions and the forms of the solutions for the above partial differential equations demonstrate that our results improve and generalise the previous results given by Saleeby, Cao and Xu. Moreover, some of our examples corresponding to every case in our theorems reveal the significant difference in the order of solutions for equations from a single variable to several variables.
A fused deposition modeling (FDM)-based polarization-dependent frequency-agile Frequency Selective Surface using distilled water is proposed in this paper. The FSS consists of a periodic array of vertically meandered square loops with two rectangular fluidic cavities embedded within the substrate. The resonant frequency is dynamically tuned across three distinct operating states by selectively filling one or both embedded cavities with distilled water, achieving a 47.42% tuning range in TE mode (2.15–3.45 GHz) and a 10.28% range in TM mode (3.32–3.68 GHz). An equivalent circuit model is developed to explain this tuning behavior by emphasizing the impact of fluid-induced permittivity changes in the substrate. Experimental results from a fabricated prototype validate the simulated performance, demonstrating angular stability up to 45∘. The proposed geometry is low-cost, lightweight, and energy-efficient, making it ideal for integration into adaptive communication systems, reconfigurable antennas, and electromagnetic shielding applications.
For time series with high temporal correlation, the empirical process converges rather slowly to its limiting distribution. Many statistics in change-point analysis, goodness-of-fit testing, and uncertainty quantification admit a representation as functionals of the empirical process and therefore inherit its slow convergence. As a result, inference based on the asymptotic distribution of those quantities is significantly affected by relatively small sample sizes. We assess the quality of higher-order approximations (HOAs) of the empirical process by deriving the asymptotic distribution of the corresponding error terms. Based on the limiting distribution of the higher-order terms, we propose a novel approach to calculate confidence intervals for statistical quantities such as the median. In a simulation study, we compare coverage rates and lengths of these confidence intervals with those based on the asymptotic distribution of the empirical process and highlight some benefits of HOAs of the empirical process.
Steinernema carpocapsae is an entomopathogenic nematode with established efficacy against various agricultural pests. However, its impact on key lepidopteran pests, including Ostrinia furnacalis, Mythimna separata, and Spodoptera litura, remains underexplored, particularly at the pupal stage. This study evaluates the efficacy of the nematode through a combination of choice-based attraction assays, non-choice infection performance bioassays involving direct application to specific pupal body parts, and assessments of sublethal effects on adult survival and oviposition following pupal-stage exposure. S. carpocapsae exhibited a clear preference for pupae of all three pests over blank controls and for previously infected pupae over healthy pupae. When presented with different pupal genders, S. carpocapsae preferred female M. separata over males but showed no gender preference for O. furnacalis and S. litura. Infection performance varied by body part, with a higher infection performance on the abdomen and thorax compared to the head for O. furnacalis and S. litura, and on the abdomen over the thorax and head for M. separata. Adult survival probability was significantly lower when pupae were infected, and female oviposition was reduced when either member of a mating pair had been infected. These findings highlight the efficacy of S. carpocapsae as a promising biological control agent against these lepidopteran pests, particularly when targeting the pupal stage.
In this paper, I present an analysis of purgatory from an issuantist perspective – an approach that seeks to reconcile the concept of a loving God with the doctrine of eternal hell. Issuantism posits that both heaven and hell originate from God’s love, and I extend this framework to purgatory, offering a new interpretation of its eschatological significance. After examining the views of influential figures such as Joseph Ratzinger and Jerry Walls, I argue that purgatory must be understood as a condition outside of time to maintain theological consistency. I propose a model of purgatory located within an aeveternal dimension – an intermediate state between time and eternity – as a way to resolve tensions concerning temporality, moral agency, and the soul’s orientation toward heaven.
This paper presents a novel design of quad-band rat-race couplers (RRCs) based on a modified T-shaped structure (MTSS). Two coupled lines are incorporated into the conventional dual-band T-shaped structure to create the MTSS, making it equivalent to a quarter-wavelength transmission line at four operating bands. The ABCD matrix method is applied to analyze the quad-band MTSS, deriving closed-form equations for calculating parameters of the structure. Then, a conventional RRC is separated into quarter-wavelength transmission lines, which are replaced by the proposed MTSS. To validate the design method, a quad-band RRC operating at 0.6, 1.196, 1.853, and 2.45 GHz is designed, fabricated, and tested. Simulation and experimental results demonstrate excellent agreement with theoretical prediction. The measured results show that input return loss exceeds 21.75 dB, isolation is greater than 21.6 dB, and insertion loss is less than 4.4 dB at all four operating frequencies. Phase deviations observed from the measured in-phase and out-phase responses are within 0o ± 4.6o and 180o ± 6.7o, respectively. Compared to most previously reported quad-band RRCs, the proposed circuit features a simple design and offers superior performance in isolation, return loss, and insertion loss.
It has long been recognized that Sartre’s description of “being-in-itself” in the Introduction to Being and Nothingness (B&N) is reminiscent of Eleatic monism, the view traditionally attributed to Parmenides on which there is only one mind-independent entity, which is undifferentiated and atemporal. I reconstruct two arguments from premises Sartre endorses in B&N for Eleatic monism. These arguments are interesting not only because they give new life to an old reading of B&N, but also because there has recently been a revival of interest in monism in analytic metaphysics.
Bowmouth guitarfish (Rhina ancylostoma) is typically described in the literature as a coastal ray species that inhabits nearshore waters up to 70 m deep on the continental shelf, dwelling on or near the seafloor, primarily over sandy or muddy substrates and around coral reefs. However, the scientific monitoring programme aboard the Spanish and Seychellois tropical tuna purse seine fleets has documented 37 incidental captures of this species in open waters of the Indian Ocean, through onboard observers and electronic monitoring systems. All these captures occurred within the first 200 m of the water column, at locations where the maximum depth exceeded 2000 m. The study was conducted based on at-sea observations onboard the Spanish and Seychellois tropical tuna purse seine fleets operating in the Indian Ocean from 2017 to 2023. The observation coverage varied throughout this time-series, with more than 85% of fishing activity monitored since 2017. The interactions recorded were predominantly between January and May, and more frequent in the years 2018 and 2021. The captured individuals ranged from 150 to 250 cm in total length, with females recorded more frequently than males. These observations provide valuable insights into the large-scale movements of this neritic species beyond its typical coastal and inshore habitats in the Indian Ocean.
Among body measurements, body weight (BW) is one of the most important within the buffalo production system, due to its association with economic characteristics. In previous research, we have shown that body volume (BV) is an effective predictor of BW in lactating adult water buffalo. As there are no equations to predict BW through BV for growing dairy buffaloes (young animals), we hypothesized that equations should be developed to meet this need. BW, body length (BL) and heart girth (HG) data were collected in 160 growing dairy buffaloes raised in commercial farms in southern Mexico, with body volume (BV) then estimated from BL and HG. The ratio between BV and BW was determined by linear, quadratic and allometric equations. The goodness-of-fit of the regression models was evaluated using the Akaike information criterion (AIC), the Bayesian information criterion (BIC), the coefficient of determination (R2), the mean square error (MSE) and the root MSE (RMSE). After this, the k-folds cross-validation was performed to indicate a better fit. Our results showed that the growing dairy buffaloes presented a BW of 256.6 ± 96.82 kg and a BV of 155.3 ± 74.87 dm3. High and positive correlation were observed among all variables studied. All parameters (R2, MSE, RMSE, AIC and BIC) used to evaluate the regression equations showed that the quadratic regression model was more effective than the linear and allometric models for estimating BW using BV. The criteria for evaluating and validating models showed that the quadratic model presented a better predictive performance. Based on these findings, we conclude that body volume data to estimate body weight of growing dairy buffaloes were best fitted using the quadratic regression model.
People with HIV (PWH) often encounter health-harming legal needs that impede their access to care, including structural issues such as racism, discrimination, unstable housing, and stigma. Medical-Legal Partnerships (MLPs) have emerged as a promising strategy to address these challenges within HIV care settings. This study aimed to identify the characteristics and strategies of MLPs that are most effective in improving HIV care continuum outcomes. A mixed-methods analysis was conducted utilizing data from a cross-sectional survey of 60 providers in MLPs. Categorical features of MLPs, such as the personnel responsible for screening for health-harming legal needs (HHLN), the organizational structure (community-based vs. institutional), and the delivery of legal services, were examined. A multiple, variable linear regression analysis was conducted to explore the association between these variables and outcomes. Community health organizations were found to be associated with a greater number of patients achieving suppressed HIV viral load. Additionally, a higher number of on-site services were positively correlated with a greater percentage of PWH achieving decreased viral load and completing follow-up appointments. Findings underscore the significance of comprehensive care approaches within MLPs for enhancing positive patient outcomes in HIV care settings.