After several recent special issues, conceived and prepared successively by R. H. Robbins and E. M. Uhlenbeck (no. 153, ‘The Cultural Heritage: Languages in Peril”), Y. M. Coppens (no. 155, “From the Heavens to the Mind”), M. Matarasso (no. 158, “Shamans and Shamanism: On the Threshold of a New Millennium”), Diogenes turned to Julio Labastida, coordinator of the study of the social sciences at the National University of Mexico and contributing editor to Diogenes (he is in charge of the Spanish edition), and asked him to gather together for the current issue a certain number of articles devoted to themes related to the five-hundredth anniversary of America's “discovery” and its entry into a unified world.

There is a hint of paradox in opening this collection of texts on the procedures for totalizing knowledge in Antiquity by calling to witness the Platonic dialogues. What might they contribute, besides a critique of Sophistic polymathy, Socrates’ nescience, his way of jumping in and interrupting long discourses, the disconcerting interlude of preliminary questions, and the aporetic collapses? A host of questions does not make a book, much less a library - unless the Socratic stratagem defines some entirely new conditions, or unless Plato's argument authorizes, beyond a program of study, a way of constituting knowledge with its hierarchized elements and the articulations called for by this program. A few remarks are in order here.

Iron-manganese concretions are common in upper sola of Alfisols in the Inner Bluegrass Region of Kentucky. Their nature and quantities appear to be related to the fluctuation of seasonal perched water tables above clayey argillic horizons. This study was conducted to examine changes in the macro-and micromorphology, chemistry and mineralogy of concretions as a function of size, color and soil depth. Total Mn and Fe contents increased, while SiO2 decreased with concretion size. Black concretions contained higher Mn, while brown concretions were higher in Fe. Crystalline Mn- and Fe-oxides fractionated with a sequential extraction procedure increased, but amorphous Mn and Fe decreased with concretion size. Goethite was the only crystalline Fe oxide mineral identified by X-ray diffraction (XRD) analysis. Manganese oxide minerals were very difficult to detect due to the diffuse nature of their XRD peaks and poor crystallinity. Examination of soil thin sections showed concretions of soil horizons overlying restrictive clayey layers to exhibit differentiated fabrics, sharp external boundaries and generally spherical shapes. Concretions found within clayey restrictive layers or above lithic interfaces usually had less structural organization, softer matrices and diffuse external boundaries due to longer term saturated conditions. Scanning electron microscopy (SEM) examinations suggested that the concretionary matrix, in spite of its density, has numerous cavities and an extensive micropore system within which dissolved plasmic Fe and Mn can diffuse and precipitate.

Aoun and Li (2003) argued that whether the head of Chinese relative clauses can reconstruct at Logical Form is determined by its phrasal category. When the head is a noun phrase, it can reconstruct; but when it is a quantifier phrase, it cannot. This paper uses a sentence-picture matching experiment to investigate this claim. The results showed that a quantifier phrase can reconstruct. Thus, we do not need to stipulate a noun phrase/quantifier phrase distinction for the reconstruction of heads in Chinese relative clauses. Both types of phrases can reconstruct, predicted by the head-raising analysis of relative clauses.

Certified organic farming is a suite of regulated practices that can support social, economic, and ecological sustainability in agriculture. Despite the standardization and regulation of certifying bodies, practices adopted by organic farmers vary with potential heterogeneous effects on environmental outcomes. While it is accepted that beliefs can enable or constrain the adoption of farming practices, it remains unclear if variation in organic farmer beliefs mediates observed heterogeneity in practices and the ecology of farms. Communities of soil microorganisms that induce plant resistance and regulate insect herbivores offer a lens to explore the relationship between beliefs and practice adoption. Variation in insect herbivores across organic farms is common but none have studied the role of farmer beliefs in regulating pests through the soil microbiome. Herein, we hypothesized that variation in adoption of microbiome-supportive practices by organic farmers is driven by heterogeneity in their microbiome beliefs. We also investigate the importance of demographic variables and farm characteristics, compared to farmer beliefs, for adoption of practices that support the microbiome. To test our hypothesis, we surveyed the microbiome beliefs, farming practices, and motivations of 85 organic farmers in New York State, USA. We used affinity propagation to cluster farmers by their beliefs, and statistical models to evaluate variation in farming practice adoption and farmer motivations. Our survey received a 30.5% response rate, most organic farmers (≈96%) believed the soil microbiome was important for supporting plant defenses and reducing pests, and <16% believed their farming practices were unimportant for promoting beneficial microbiomes. Seven clusters of farmers were identified that varied in their microbiome beliefs. Among the clusters ≈42% of farmers believed on-farm management and external factors (e.g., climate change) were important for promoting the microbiome. These farmers used fewer pesticides and synthetic mulches, more pre-planting practices (e.g., solarization), and were more motivated to adopt new practices to support the microbiome than their peers. The most important factors motivating adoption were reductions in pests, increased yields, and biodiversity benefits. Beliefs, demographics, and farm characteristics (e.g., time in organic management) were correlated with similar suites of farming practices, but only beliefs predicted farmer motivations. Our study suggests beliefs are key to understanding farmer motivations and promoting organic farming system sustainability via the pest-suppressive microbiome. More broadly, we suggest the need for socio-ecological approaches that account for farmer beliefs when studying the adoption of conservation practices in agroecosystems.

It is known that a nonlinear Schrödinger equation describes the self-modulation of a large amplitude circularly polarized wave in relativistic electron–positron plasmas in the weakly and strongly magnetized limits. Here, we show that such an equation can be written as a modified second Painlevé equation, producing accelerated propagating wave solutions for those nonlinear plasmas. This solution even allows the plasma wave to reverse its direction of propagation. The acceleration parameter depends on the plasma magnetization. This accelerating solution is different to the usual soliton solution propagating at constant speed.

Political party think tanks (PPTTs) are important to the performance of parties' core functions. Despite their importance, they have largely escaped academic attention. To understand the role of PPTTs in contemporary politics, we develop a typology of their key functions (distinguishing between political party and think tank functions), and target audiences (distinguishing between internal and external target groups). Based on a comprehensive literature review and 22 in-depth interviews with leading representatives of PPTTs in the Netherlands and Flanders, we identify four types of PPTTs: Party Assistants, Party Supporters, Party Promoters and Party Intellectuals. The characteristics of the four types of PPTTs are illustrated through the analysis of four paradigmatic cases: the Study Centre Open Vld as an example of a Party Assistant, the Scientific Bureau GroenLinks as an example of a Party Supporter, the Renaissance Institute as an example of a Party Promoter, and the TeldersFoundation as an example of a Party Intellectual.

The damage characteristics of fused silica were investigated under low-temporal coherence light (LTCL). It was found that the laser-induced damage threshold (LIDT) of fused silica for the LTCL was lower than that of the single longitudinal mode pulse laser, and for the LTCLs, the LIDTs decrease with the increasing of laser bandwidth, which is not consistent with the temporal spike intensity. This is due to the nonlinear self-focusing effect and multi-pulse accumulation effect. The specific reasons were analyzed based on theoretical simulation and experimental study. This research work is helpful and of great significance for the construction of high-power LTCL devices.

The AMS Golden Valley radiocarbon analysis laboratory is equipped with two accelerator mass spectrometers: AMS facility from Budker Institute of Nuclear Physics (BINP AMS) and MIni CArbon DAting System (MICADAS-28) from Ionplus AG and two graphitization systems: Automated Graphitization Equipment (AGE-3) from Ionplus AG and Absorption-catalytic setup developed in Boreskov Institute of Catalysis (ACS BIC). The laboratory provides routine 14C analyses of various samples: collagen, cellulose, humic acids, carbonates from sediments, etc. The main focus of the laboratory is to determine the age of archaeological artifacts by radiocarbon dating. This work presents a comprehensive description of the BINP AMS facility, with its operation compared with that of MICADAS in the same laboratory. In 2022, the AMS Golden Valley laboratory participated for the first time in the Glasgow International Radiocarbon Inter-comparison (GIRI). The samples were graphitized on the AGE-3 and subsequently measured in both AMS facilities. A comparison of the results of the two series of experiments, namely AGE-3 + MICADAS-28 and AGE-3 + BINP AMS, is given.