Independent Field Research Articles

Modeling Challenges and Limitation Principles of Reissner’s Mixed Approaches to Laminates

Displacement-based formulations for composite structures are directly linked to the functional called the Principle of Virtual Displacements and present the minimum number of independent modeled fields, which are the displacements. However, these models usually provide an inadequate approximation of the transverse stress fields and suffer from pathological numerical problems. These issues have been addressed with the introduction of mixed variational formulations where independent stress fields are included in the definition of the corresponding functionals. Particularly effective and widely used are Reissner’s mixed variational theorem and Hellinger–Reissner Principle. Both Reissner’s mixed variational theorem and Hellinger–Reissner principle allow the a priori enforcing of the interlaminar equilibrium because of the axiomatic modeling of the transverse stresses. However, these functionals are different and present their own challenges. Under certain circumstances, Reissner’s Mixed Variational Theorem was shown to produce thickness oscillations of the displacements and transverse stresses. It was not clear if Hellinger-Reissner Principle had similar properties. It is shown that both functionals may present numerical oscillations. Moreover, the reconstructed displacement and stress fields are actually identical between Reissner’s Mixed Variational Theorem and Hellinger-Reissner Principle if the orders of the in-plane stresses of the Hellinger–Reissner Prinicple case are sufficiently large. In other words, a Hellinger–Reissner Principle/Reissner’s Mixed Variational Theorem Limitation Principle is shown to exist in addition to the well-studied limitation principle between Hellinger–Reissner principle and principle of virtual displacements.

Statistical analysis of the matrix method for measuring the radar characteristics of objects

The matrix method for measuring the radar characteristics of objects is examined. The method involves irradiating the object with a system of independent test fields, receiving the set of scattered fields, and performing posterior processing of the obtained results based on the superposition principle to determine the required radar characteristics of the object. An analysis of the information capabilities of the matrix method for measuring linear and nonlinear radar characteristics of objects is conducted, considering random errors in the registration of the amplitude and phase of the test signals. The variances of the desired linear and nonlinear radar characteristics of objects are determined, assuming a high signal-to-noise ratio in each test signal reception channel and maximum likelihood estimation of the amplitude and phase of the test signals. It is established that the matrix method for measuring radar characteristics of objects is functional under real conditions involving noise and interference.

Web-Series Ads as a New Marketing Media: Toward a Commercial-Independent Digital Integration Model

This study presents a new type of advertisement—web-series ads. This undiscussed form of advertising is unique, as it presents an independent digital cultural field. By examining the main structural and narrative features of web-series ads and consumers’ responses, this research presents an integration model which explains how advertisements, as a commercial system, integrate into an independent new media system. Using thematic, narrative–structural, and textual analysis methods, this research shows how marketers convey messaging by introducing a free-from-constraints new online advertising media type. The use of polysystem theory offers a new theoretical perspective to media research and explains the findings.

Advancing nitrogen nutrition index estimation in summer maize using continuous wavelet transform

Rapid and non-destructive diagnosis of plant nitrogen (N) status is crucial to optimize N management during the growth of summer maize. This study aimed to evaluate the effectiveness of continuous wavelet analysis (CWA) in estimating the nitrogen nutrition index (NNI), to determine the most suitable wavelet analysis method, and to identify the most sensitive wavelet features across the visible to near-infrared spectrum (325–1,025 nm) for accurate NNI estimation. Field experiments were conducted across two sites (Kaifeng and Weishi) during the 2022 and 2023 growing seasons using four summer maize cultivars (XD20, ZD958, DH661, and DH605) under varying N application rates (0, 80, 160, 240, and 320 kg N ha-1). Canopy reflectance spectra and plant samples were collected from the V6 to V12 growth stages. The wavelet features for each spectral band were calculated across different scales using the CWA method, and their relationships with NNI, plant dry matter (PDM), and plant N concentration (PNC) were analyzed using four regression models. The results showed that NNI varied from 0.61 to 1.19 across different N treatments during the V6 to V12 stages, and the Mexican Hat wavelet was identified as the most suitable mother wavelet, achieving an R² value of 0.73 for NNI assessment. The wavelet features derived from the Mexican Hat wavelet were effective in estimating NNI, PDM, and PNC under varying N treatments, with the most sensitive wavelet features identified as 745 nm at scale 7 for NNI, 819 nm at scale 5 for PDM, and 581 nm at scale 6 for PNC using linear regression models. The direct and indirect methods for NNI estimation were compared using independent field data sets. Both methods proved valid to predict NNI in summer maize, with relative root mean square errors of 10.8% for the direct method and 13.4% for the indirect method. The wavelet feature at 745 nm, scale 7, from the direct method (NNI = 0.14 WF (745 nm, 7) + 0.3) was found to be simpler and more accurate for NNI calculation. These findings provide new insights into the application of the CWA method for precise spectral estimation of plant N status in summer maize.

JWST/NIRSpec Observations of Lyman α Emission in Star-forming Galaxies at 6.5 ≲ z ≲ 13

We present an analysis of JWST Lyα spectroscopy of z ≳ 6.5 galaxies, using observations in the public archive covering galaxies in four independent fields: Great Observatories Origins Deep Survey (GOODS)-N, GOODS-S, A2744, and the Extended Groth Strip (EGS). We measure the Lyα emission line properties for a sample of 210 z ≃ 6.5–13 galaxies, with redshifts confirmed independently of Lyα in all cases. We present three new detections of Lyα emission in JWST spectra, including a large equivalent width (EW; =143 Å) Lyα emitter (LAE) with strong C iv emission (EW = 21 Å) at z = 7.1 in GOODS-N. We measure the redshift-dependent Lyα EW distribution across our sample. We find that strong Lyα emission (EW > 25 Å) becomes increasingly rare at earlier epochs, suggesting that the transmission of Lyα photons decreases by 4× between z ≃ 5 and z ≃ 9. We describe potential implications for the intergalactic medium neutral fraction. There is significant field-to-field variance in the LAE fraction. In contrast to the three other fields, the EGS shows no evidence for reduced transmission of Lyα photons at z ≃ 7–8, suggesting a significantly ionized sight line may be present in the field. We use available NIRCam grism observations from the First Reionization Epoch Spectroscopically Complete Observations survey to characterize overdensities on large scales around known LAEs in the GOODS fields. The strongest overdensities appear linked with extremely strong Lyα detections (EW > 50 Å) in most cases. Future Lyα spectroscopy with JWST has the potential to constrain the size of ionized regions around early galaxy overdensities, providing a new probe of the reionization process.

Identifying ecological factors mediating the spread of three invasive mosquito species: citizen science informed prediction

AbstractDue to their potential role in pathogen transmission, invasive mosquitoes pose considerable threats to human and animal health. Several studies have identified the most important ecological drivers mediating the establishment and spread of key mosquito species (e.g., Aedes aegypti, and Ae. albopictus), and made predictions for future distribution. We evaluated the effect of an exhaustive list of environmental predictors on the distribution of three invasive species in Hungary (Ae. albopictus, Ae. japonicus, and Ae. koreicus) by using the same standards for data collection based on citizen science observations. Current distribution maps of these species were generated from a 5-year survey, then were compared with various predictor maps reflecting climate, habitat type, food supply, traffic, and interspecific competition by using a boosted regression trees approach that resulted in a subset of variables with the strongest impact. The best predictor sets were used to predict the probability of occurrence of the focal species for the whole country, and these predictions based on citizen science were evaluated against the results of an independent recent field surveillance. We uncovered species-specific patterns and found that different predictor sets were selected for the three different species, and only predictions for Ae. albopictus could be validated with direct trapping data. Therefore, citizen science informed distribution maps can be used to identify ecological predictors that determine the spread of invasive mosquitoes, and to estimate risk based on the predicted distribution in the case of Ae. albopictus.

СРАВНИТЕЛЬНО-ПРАВОВОЙ АНАЛИЗ РЕГУЛИРОВАНИЯ ТЕХНОЛОГИЧЕСКОЙ ПОЛИТИКИ И ТЕХНОЛОГИЧЕСКОГО СУВЕРЕНИТЕТА В ЕВРАЗИЙСКОМ ЭКОНОМИЧЕСКОМ СОЮЗЕ И ЕВРОПЕЙСКОМ СОЮЗЕ В СВЕТЕ РАЗРАБОТКИ ЗАКОНОПРОЕКТА «О ТЕХНОЛОГИЧЕСКОЙ ПОЛИТИКЕ В РОССИЙСКОЙ ФЕДЕРАЦИИИ О ВНЕСЕНИИ ИЗМЕНЕНИЙ В ОТДЕЛЬНЫЕ ЗАКОНОДАТЕЛЬНЫЕ АКТЫ РОССИЙСКОЙ ФЕДЕРАЦИИ»

The results of a comparative legal analysis of acts regulating relations in the field of technological policy and technological independence (technological sovereignty) in the Eurasian economic union and the European union are presented, including the areas of the economy that are of key importance from the point of view of ensuring technological sovereignty, the legal mechanisms allowing the development and implementation of advanced technologies are described, the legal technological policy instruments in the Eurasian economic union and the European union. Based on the conducted research, the advantages and disadvantages of the procedures for regulating technological policy in these international organizations have been identified. The results of the conducted research can be taken into account when further finalizing Draft law № 632206-8 «On technological policy in the Russian Federation and on amendments to certain legislative acts of the Russian Federation».

Evolution of the Concept of Traumatic Experience: Cultural Aspect

The purpose of the article is to conduct a cultural reflection to clarify the peculiarities of the evolution of the concept of traumatic experience, to outline the specifics of its conceptual and semantic deployment in the European socio-cultural space. The research methodology includes general scientific principles of systematisation and generalisation of the problem under study, which allowed to identify and scientifically substantiate existing theories, conceptual approaches to understanding the content of the concepts of ‘trauma’, ‘traumatic experience’, ‘trauma of modernisation’, ‘trauma of social change’. The purpose and objectives of the article led to the use of an axiological approach, which allowed identifying the interdisciplinary nature of the theories under consideration, revealing personalised scientific positions and their cultural context. The use of the analytical method allowed us to identify conceptual foundations for further scientific perspectives on the problematisation of traumatic experience, namely, to clarify the role and significance of cultural/creative practices in processing traumatic experience by studying the evolution of this concept within the framework of the formation of trauma studies as an independent field of scientific knowledge and to make an attempt to develop algorithms for their practical implementation in the discourse of applied cultural studies. The scientific novelty lies in the cultural analysis of personalised scientific positions on the evolution of the concept of ‘traumatic experience’, in view of the specifics of its conceptual and semantic deployment in the European socio-cultural space. Conclusions. The conceptual and semantic development of the concept of traumatic experience unfolds against the dynamic change in the European general socio-cultural context caused by the outbreak and course of the First World War. Already during the war and after its end, on the basis of the empirical experience gained in the treatment of numerous traumas and mental disorders, scientific understanding of their nature, the specifics of traumatic experience manifestations began, and practicing military doctors, psychiatrists and psychologists developed recommendations for its experience, overcoming, and processing/working through. The evolution of the concept of traumatic experience in the discourse of classical psychoanalysis developed in the unity of epistemological and hermeneutical theory of experience, playing a leading role in explicating trauma and traumatic experience in the sphere of interest of various social sciences and humanities, from art history and cultural studies to sociology and political science. By expanding the subject field of studying trauma and traumatic experience, Freud laid the foundation for a methodological principle that is called interdisciplinary and becomes one of the basic ones for further studying trauma and traumatic experience against the broad background of a holistic picture of human existence in society and the world of culture.

THE IMPACT OF THE TRANSFER, APPOINTMENT, AND DISMISSAL OF JUDGES ON JUDICIAL INDEPENDENCE IN LIGHT OF THE 2020 CONSTITUTIONAL AMENDMENT

Objective: The aim is to highlight the important role of the Supreme Judicial Council in the transfer, appointment, and dismissal of judges, particularly after the adoption of the justice sector modernization plan in Algeria. Additionally, it seeks to contribute to the strengthening of the Supreme Judicial Council through the 2020 constitutional amendment and its effectiveness. Theoretical Framework: The study is based on the field of appointing, transferring, promoting, and dismissing judges, which falls under the jurisdiction of the Supreme Judicial Council according to the 2020 constitutional amendment. It also examines the council's authority in supervising judicial discipline, which entails criminal, civil, and disciplinary responsibility as stipulated in the organic law and the 2020 Constitution. Method: The objective analytical method was used, as the subject of this study is derived from legal texts and their analysis. Results and Discussion: The Supreme Judicial Council in Algeria continuously reviews its composition and institutions to adapt to the requirements of the constitution and the law. Its independence limits interference from any authority, including the legislative or executive branches, in the judiciary's professional path. This applies to the appointment, transfer, promotion, and dismissal of judges, and also encompasses all matters related to judges. Research Implications: The results indicate that the 2020 Constitution has made the Supreme Judicial Council more adaptable to current developments and strengthened its independence, particularly in relation to the appointment, transfer, promotion, and dismissal of judges. However, it is necessary to ensure that the composition of the Supreme Judicial Council is exclusively comprised of members of the judiciary, and that the position of President of the Supreme Judicial Council is assigned to the Chief Justice of the Supreme Court to support guarantees. Originality/Value: This study serves as a contribution to the field of judicial independence through the appointment, transfer, promotion, and dismissal of judges. It enhances this specialization and supports independence by referring to the 2020 constitutional amendment. The study is limited and has not been deeply explored before, providing valuable insights into the Supreme Judicial Council's efforts to strengthen judicial independence in light of the 2020 Constitution.

THE REALITY OF PARALLEL TRADE IN CRIMINAL LEGAL TEXTS

Objective: The aim is to highlight the important role of the Supreme Judicial Council in the transfer, appointment, and dismissal of judges, particularly after the adoption of the justice sector modernization plan in Algeria. Additionally, it seeks to contribute to the strengthening of the Supreme Judicial Council through the 2020 constitutional amendment and its effectiveness. Theoretical Framework: The study is based on the field of appointing, transferring, promoting, and dismissing judges, which falls under the jurisdiction of the Supreme Judicial Council according to the 2020 constitutional amendment. It also examines the council's authority in supervising judicial discipline, which entails criminal, civil, and disciplinary responsibility as stipulated in the organic law and the 2020 Constitution. Method: The objective analytical method was used, as the subject of this study is derived from legal texts and their analysis. Results and Discussion: The Supreme Judicial Council in Algeria continuously reviews its composition and institutions to adapt to the requirements of the constitution and the law. Its independence limits interference from any authority, including the legislative or executive branches, in the judiciary's professional path. This applies to the appointment, transfer, promotion, and dismissal of judges, and also encompasses all matters related to judges. Research Implications: The results indicate that the 2020 Constitution has made the Supreme Judicial Council more adaptable to current developments and strengthened its independence, particularly in relation to the appointment, transfer, promotion, and dismissal of judges. However, it is necessary to ensure that the composition of the Supreme Judicial Council is exclusively comprised of members of the judiciary, and that the position of President of the Supreme Judicial Council is assigned to the Chief Justice of the Supreme Court to support guarantees. Originality/Value: This study serves as a contribution to the field of judicial independence through the appointment, transfer, promotion, and dismissal of judges. It enhances this specialization and supports independence by referring to the 2020 constitutional amendment. The study is limited and has not been deeply explored before, providing valuable insights into the Supreme Judicial Council's efforts to strengthen judicial independence in light of the 2020 Constitution.

Revealing the Local Time Structure of the Alfvén Radius and Travel Times in Jupiter's Magnetosphere

AbstractJovian magnetospheric plasma is coupled to the ionosphere through Alfvén waves. Alfvén waves enable the transport of angular momentum and energy between the planet and magnetospheric plasma, a process that ultimately generates Jupiter's bright auroral emissions. However, past the Alfvén radius, the location where the radial velocity is greater than the Alfvén velocity, magnetospheric plasma is decoupled from the planet. Alfvén waves launched by magnetospheric plasma do not reach the ionosphere, angular momentum cannot be transported from the planet, and auroral emissions should diminish. Knowledge of Jupiter's Alfvén radius location is critical for interpreting drivers of auroral emissions, in situ data, and applications of numerical models. Previous studies that determined the location of the Alfvén radius assumed an azimuthally symmetric magnetosphere and local‐time independent magnetic field. Here, we employ a statistical description of the magnetic field that includes local time effects. We find a minimum Alfvén radius of 30 (Jupiter radii) at 6 LT, with plasma decoupled from the planet in the post‐dusk through dawn sector. Furthermore, no Alfvén radius exists within 60 between 8 and 20 LT. At distances greater than 50 , the Alfvén travel time is such that magnetospheric plasma moves substantially in the magnetosphere before angular momentum can be efficiently transferred from the atmosphere. Therefore, the angular momentum supplied may no longer be sufficient for the local conditions. Our results highlight the importance of local time considerations and offer new interpretations for local time dependent auroral features, such as the polar collar.

Future Orienteering Evaluation Model: forecasting, foresight and anticipation indices

The following paper adopts the term Future Orienteering to indicate the attitude of openness and preparedness to the future of individuals, communities and organisations. If Futures Studies wants to become an independent field of research, future skills need to be developed with appropriate training paths, and future attitudes and strategies need to be evaluated accurately. Thus, considering the necessity of a measurement system for the evaluation of strategic foresight and future-based activities, this article illustrates a new theoretical model, where special emphasis is placed on the distinction between Forecasting, Foresight and Anticipation, according to the Theory of Anticipation presented in (Poli, Introducing anticipation. In: Poli R (ed) Handbook of anticipation, 2019a); (Poli, Lavorare con Il futuro: idee e strumenti per governarel’incertezza, 2019b); (Poli, Introduction to anticipation studies, 2017). The result is a battery of three synthetic indexes, immediately readable to allow easy comparisons. Here, the following model described represents a preliminary stage in the development of an evaluation system, indeed few suggestions for use will be provided.

Sprain energy consequences for damage localization and fracture mechanics

The 2023 smooth Lagrangian Crack-Band Model (slCBM), inspired by the 2020 invention of the gap test, prevented spurious damage localization during fracture growth by introducing the second gradient of the displacement field vector, named the "sprain," as the localization limiter. The key idea was that, in the finite element implementation, the displacement vector and its gradient should be treated as independent fields with the lowest ([Formula: see text]) continuity, constrained by a second-order Lagrange multiplier tensor. Coupled with a realistic constitutive law for triaxial softening damage, such as microplane model M7, the known limitations of the classical Crack Band Model were eliminated. Here, we show that the slCBM closely reproduces the size effect revealed by the gap test at various crack-parallel stresses. To describe it, we present an approximate corrective formula, although a strong loading-path dependence limits its applicability. Except for the rare case of zero crack-parallel stresses, the fracture predictions of the line crack models (linear elastic fracture mechanics, phase-field, extended finite element method (XFEM), cohesive crack models) can be as much as 100% in error. We argue that the localization limiter concept must be extended by including the resistance to material rotation gradients. We also show that, without this resistance, the existing strain-gradient damage theories may predict a wrong fracture pattern and have, for Mode II and III fractures, a load capacity error as much as 55%. Finally, we argue that the crack-parallel stress effect must occur in all materials, ranging from concrete to atomistically sharp cracks in crystals.

Economic valuation of carbon sequestration in Quito’s Metropolitan Park using Sentinel-2 and neural networks

This study introduces an innovative method for assessing the economic value of carbon stored by the urban park forest in Quito, Ecuador. The method uses Sentinel-2 remote sensing data and advanced deep learning techniques. A large forest study area was chosen, and detailed field measurements were taken to gather biomass and carbon data. Sentinel-2 satellite images were processed to correct for radiation and atmospheric conditions, and vegetation indices such as NDVI and EVI were calculated. To model forest biomass, a convolutional neural network (CNN) was created and trained using Sentinel-2 spectral bands and vegetation indices. The model was validated with independent field data and demonstrated high accuracy in estimating biomass and carbon, as indicated by evaluation metrics like RMSE and R². The findings include detailed maps showing the spatial distribution of biomass and carbon in the study area, which can be a valuable tool for forest management and the implementation of policies for valuing stored carbon. This approach combines the high resolution of Sentinel-2 data with the predictive power of neural networks, providing a robust and scalable method for estimating carbon across large forest areas. The study's conclusions emphasize the feasibility and accuracy of this approach and its potential for application in various forestry and geographical contexts.

Producing annual Australia-wide vegetation height images from GEDI and Landsat data

ABSTRACT Vegetation height, and its spatial and temporal changes, is an important environmental parameter required for understanding natural habitats, estimating carbon stores and monitoring forestry activities. Recent satellite LiDAR altimetry sensors have discontinuous spatial coverage but can be combined with spatially complete remote sensing data to extrapolate to large regions. Earlier studies have focused on producing a single spatially continuous vegetation height product. This research builds on past studies, using Landsat (annual surface reflectance and fractional cover products) and the Global Ecosystem Dynamics Investigation (GEDI) data to generate annual vegetation height layers from 1988 to 2022. GEDI data for 2019 were used to train and validate the model, resulting in a root mean square error (RMSE) of 5.45 m, mean absolute error (MAE) of 3.82 m, and coefficient of determination (R2) of 0.63. This accuracy reduces when the modelled height for 2020, 2021, and 2022 is compared to GEDI data for the same years (RMSE = 6.08–6.29 m, MAE = 4.36–4.73 m, and R2 = 0.48–0.54). Validation with independent field measurements across Australia from 2011 to 2021 shows an RMSE, MAE, and R2 of 8.2 m, 5.2 m, and 0.48, respectively. One source of error is the saturation of the Landsat signal in tall, closed canopy vegetation. While model accuracy is correlated with plot-based vegetation height measurements, results indicate that accuracy reduces for the years outside of the model calibration year (i.e. 2019). When compared to other vegetation height products (also produced using GEDI and spatial remote sensing data) from three independent published studies (one for 2009, one for 2019, and one for 2020), the model developed here tends to estimate 2–4 m taller than the first two studies and around 5 m shorter when compared to the third study. This investigation demonstrates the potential to produce multiyear vegetation height at a continental scale but also highlights the large uncertainty in modelled estimates especially when extrapolating to years other than the model calibration year.

Measuring Data Quality from Building Registers: A Case Study in Italy

Geographic data quality is a complex issue requiring continuous operational improvements. Considering this to be one of the most topical research and technical issues in official statistics and environmental monitoring, this study re-connects the operational dimension of ‘geographic data quality’ with the broader issue of monitoring the quality of official statistics. By estimating the accuracy of public (spatially explicit) data, this study illustrates an operational framework with an exploratory exercise in estimating the geographic data quality characteristic of a specific information source within the official statistical system (i.e., building registry) in a given European country, namely, Italy. The results of this exercise provide a paradigmatic example of profound innovation in the activities of statistical services in Europe and specifically the Italian National Statistical Institute (Istat), transitioning from independent (and poorly connected) field surveys to an integrated system of registries. Since several studies are based on spatially explicit survey units, it is essential to estimate the quality of geographical data, especially those derived from information sources where space is topical information, such as (local, regional, or national) building registers. Thanks to the results of an empirical exercise applied to Italian building registers, the present article will discuss the issue of data accuracy, considered the main issue related to monitoring geographic data quality, from an official statistics’ perspective. Statistical indicators will be proposed for the assessment of systematic and random errors of spatially explicit measures, possibly enabling a quali-quantitative improvement in the semantic content of building registers that address the inherent requirements of official statistics. Such indicators have some positive implications for the entire system of official statistics in Italy and, for generalization, within the European Statistical System.

A post-Hegelian theory of human rights: beyond recognition and the state

This article develops a post-Hegelian social and political theory of human rights. To do this, it moves past two legacies that can be traced back to Hegel’s philosophy: his theory of recognition and his views about the embeddedness of rights within states. IR often misinterprets Hegel’s recognition theory as applying within a public world of state action. However, Hegel argues that recognition occurs before rather than within a social world. Instead, I show how and why Hegel’s analysis of Sophocles’ play Antigone is a more fruitful starting point for theorising contemporary international practices. I mobilise a Hegelian social ontology of ‘ethical life’ and a post-Hegelian critique of statism and Eurocentrism to argue that human rights should be understood as an independent field of action in which agency is embedded, rather than as a practice that is tied to sovereignty and states. Several conclusions about the ontology and epistemology of human rights stem from this analysis. Human rights practice brings forms of action and obligation into being. It enables collective (not only individual) action. It requires the exercise of humility rather than hubris. Finally, it invites a discussion of how agents can bridge external and internal perspectives to evaluate the actions that seem to be required by their practices. This critical exploration and re-interpretation of Hegel’s early work corrects IR’s tendency to use his later and more statist writings to locate and concretise the grounds for ethics.

Dimension-eight operator basis for universal standard model effective field theory

We present the basis of dimension-eight operators associated with universal theories. We first derive a complete list of independent dimension-eight operators formed with the Standard Model bosonic fields characteristic of such universal new physics scenarios. Without imposing C or P symmetries the basis contains 175 operators—that is, the assumption of universality reduces the number of independent Standard Model effective field theory (SMEFT) coefficients at dimension eight from 44807 to 175. 89 of the 175 universal operators are included in the general dimension-eight operator basis in the literature. The 86 additional operators involve higher derivatives of the Standard Model bosonic fields and can be rotated in favor of operators involving fermions using the Standard Model equations of motion for the bosonic fields. By doing so we obtain the allowed fermionic operators generated in this class of models which we map into the corresponding 86 independent combinations of operators in the dimension-eight basis of [C. W. Murphy, Dimension-8 operators in the standard model effective field theory, .]. Published by the American Physical Society 2024

Leaf age structures phyllosphere microbial communities in the field and greenhouse.

The structure of the leaf microbiome can alter host fitness and change in response to abiotic and biotic factors, like seasonality, climate, and leaf age. However, relatively few studies consider the influence of host age on microbial communities at a time scale of a few days, a short time scale relevant to microbes. To understand how host age modulates changes in the fungal and bacterial leaf microbiome on a short time scale, we ran independent field and greenhouse-based studies and characterized phyllosphere communities using next-generation sequencing approaches. Our field study characterized changes in the fungal and bacterial phyllosphere by examining leaves of different relative ages across individuals, whereas the greenhouse study examined changes in the fungal microbiome by absolute leaf age across individuals. Together, these results indicate that fungal communities are susceptible to change as a leaf ages as evidenced by shifts in the diversity of fungal taxa both in the field and the greenhouse. Similarly, there were increases in the diversity of fungal taxa by leaf age in the greenhouse. In bacterial communities in the field, we observed changes in the diversity, composition, and relative abundance of common taxa. These findings build upon previous literature characterizing host-associated communities at longer time scales and provide a foundation for targeted work examining how specific microbial taxa might interact with each other, such as fine-scale interactions between pathogenic and non-pathogenic species.

A modified quasi-3D theory and mixed beam element method for static behaviour analysis of functionally graded beams

This paper develops a modified quasi-3D theory and the mixed beam element model for static analysis of functionally graded beams. The modified quasi-3D theory encompasses two innovations. Firstly, the accurate distribution of transverse shear stress is derived from the differential equilibrium equation that describes the relationship between stresses, rather than the traditional one derived from geometric relations and constitutive equations. Secondly, the effect of distributed loads associated with transverse stretching deformation, a factor typically overlooked in the existing quasi-3D theory-based beam models, is involved. In the development of beam finite element model, the mixed variational principle is firstly utilized to formulate the model of a quasi-3D theory-based beam element, where generalized displacements and internal forces are treated as two types of independent field quantities. Two numerical examples are conducted to investigate the validity and accuracy of the proposed theory and beam element. Numerical results indicate that the proposed mixed beam element can accurately predict the stress distributions over the cross-section and produce accurate displacement solutions. Meanwhile, it is noted that the effect of distributed loads related to the transverse stretching deformation should be correctly considered in the analysis of functionally graded beams based on quasi-3D theory.