Parent crater for Australasian tektites beneath the sands of the Alashan Desert, Northwest China: Best candidate ever?

ABSTRACT Australasian tektites represent the largest group of tektites on Earth, and their strewn field covers up to one sixth of Earth’s surface. After several decades of fruitless quest for a parent crater for Australasian tektites, mostly in the main part of the strewn field in Indochina, the crater remains undiscovered. We elaborate upon a recently suggested original hypothesis for the impact in the Alashan Desert in Northwest China. Evidence from geochemical and isotopic compositions of potential source materials, gravity data, and geographic, paleoenvironmental, and ballistic considerations support a possible impact site in the Badain Jaran part of the Alashan Desert. In further support of an impact location in China, glassy microspherules recovered from Chinese loess may be the right age to relate to the Australasian tektite event, perhaps as part of the impacting body. The most serious shortcomings of the commonly accepted Indochina impact location include signs of little chemical weathering of source materials of Australasian tektites, unlike highly weathered sedimentary targets in Indochina, and questionable assumptions about transport of distal ejecta.

Geochemical indicators of a biogenic component in source materials of moldavites

ABSTRACT Formation of the Central European tektites, known as moldavites, has been associated with a large meteorite impact in southern Germany 14.8 m.y. ago. The geochemical link between moldavites and their source materials, and the processes of their possible chemical differentiation still remain uncertain. Some differences in chemical composition between moldavites and sediments of corresponding age from the surroundings of the Ries crater could be explained by a hypothesis according to which biomass covering the pre-impact area contributed to the source materials. In a comparison of the geochemical compositions of a large representative set of moldavites and suitable Ries sediments, enrichment in elements K, Ca, Mg, and Mn and depletion of Na in moldavites, similar to redistribution of these elements during their transfer from soil to plants, could indicate the unconventional biogenic component in moldavite source materials. Simple mixing calculations of the most suitable Ries sediments and a model biogenic component represented by burned biomass residue are presented. The plausibility of the estimated biomass contribution considering reconstructions of the middle Miocene paleoenvironment in the pre-impact Ries area is discussed. No significant vapor fractionation is required to explain the observed variability of moldavite chemical composition.

One for All and All in One: Modified Silica Kit-based Protocol for simultaneous sample-specific Extraction of DNA from a Variety of Source Materials

Protocols utilized for the extraction of DNA vary significantly with regards to steps involved and duration of the overall procedure due to material-specific requirements for ensuring the highest possible yield in recovery of DNA. This variation mostly affects aspects of sample preparation and digestion steps required to release the DNA from the sample material.In contexts such as the development of new PCR-based assays - which always includes a test of species-specificity - reference samples from a number of species are utilized, requiring extraction of DNA from a variety of source materials, each with their specific conditions for effective isolation of DNA.The method presented here follows the strategy of synchronizing sample material-specific aspects such as sample preparation and digestion in such a way that one common protocol can be utilized for the actual extraction and purification of the DNA, allowing for an overall more efficient extraction process, while maintaining optimized conditions for DNA recovery.

Supporting Language Learning With OERs and Open-Authoring Tools

Open educational resources (OERs) in language learning have recently captured the interests of language educators, curriculum developers, and researchers as these open-source materials serve as an alternative to traditional textbooks and costly web-based learning resources. OERs offer several benefits for language learners, including access to controlled language practice, self-study, engagement, and learning satisfaction. These resources can also promote innovative instructional practices that respond to constructivist and interactionist perspectives of second language acquisition. However, widespread use of open resources remains low among language teachers for several reasons, including a lack of awareness of how to develop and use them, overreliance on commercially produced textbooks, scarcity of resources, and guidelines for developing original open resources. In this chapter, the authors explore how to best approach the process of creating and using open resources in order to develop and promote OERs among language educators.

The Good Friday oration ad intra ecclesiam in the context of the post-conciliar liturgical reforms

This paper aims to juxtapose the differences between the versions of the Good Friday oration ad intra ecclesiam and unveil the theological character behind these modifications by analysing the prayers. The source materials were Benedict XV’s Roman Missal, Ordo Hebdomadae Sanctae Instauratus, Variationes in ordinem Hebdomadae Sanctae inducendae, and two typical editions of the reformed Roman Missals from 1970 and 2002. The paper is divided into three parts. In the first, the orations from the ad intra ecclesiam collection are explained. In the second, the changes to the orations are analysed. Finally, the influence on the theological character of the orations is presented. The analyses lead to the conclusion that it is difficult to specify a single criterion for the modifications in the ad intra ecclesiam collection. Sometimes, the changes resulted in a new organisation of the Church (e.g., oration for the Clergy and Laity of the Church), a shift in a person’s present state (oration for Those Preparing for Baptism), or a new understanding of the role of the Church in the world (oration for the Church). Some modifications are difficult to explain (oration for the Pope, for Those in Special Need).

The history of the keyboard instrument MNP I 49 from the Museum of Musical Instruments in Poznań. the state of research

The keyboard instrument MNP I 49 from the Museum of Musical Instruments in Poznań has not been a subject of detailed academic studies yet, but there have been mentions of it in various types of publications throughout the years. The item is currently placed in the exhibition hall devoted to the art of the Baroque era in the Museum of Applied Arts in Poznań. It is a unique historical item in the Polish collection due to a very scarce number of harpsichords preserved in Poland. This situation is mainly a result of two world wars in the 20th century. Due to not enough available sources, the exact time of the creation of the instrument and the name of its builder were impossible to determine. The aim of the present article was to compile and arrange previous knowledge about the historical item MNP I 49. The work lists source materials and publications in which the instrument was mentioned, such as documents from the National Archive in Poznań, Raczyński Library in Poznań and National Museum Archive in Poznań. Based on the available source materials, the author was able to determine that the harpsichord appeared at the Skórzewski family’s palace in Czerniejewo before 1855.

Bezpieczeństwo ekonomiczne Republiki Białoruś w dobie kryzysu polityczno-gospodarczego lat 2020-połowa 2021

Republic of Belarus begins the third decade of the 21st century with numerous problems, which include the unstable socio-political situation, broken dialogue and relations with the international environment, and Western sanctions. All these factors have caused a lot of turbulence in the Belarusian economy. This article is an attempt to examine the economic security of Belarus in the period of the depletion of the current economic model, the reduction of Russian energy subsidies, the Covid-19 pandemic and the political crisis resulting from the rigged presidential elections in August 2020. Data from the Belarusian Bielstat database, the National Bank of the Republic of Belarus, the World Bank, the International Monetary Fund, and rating agencies will be used as source materials.

Collecting Digital Evidence from Online Sources: Deficiencies in Current Polish Criminal Law

The importance of digital evidence, especially online content, is continuously increasing due to the proliferation of digital technologies in socio-economic life. However, the legal means of criminal evidence gathering in Polish legislation remain unchanged and do not take into account some contemporary challenges. In various countries, traditional rules of evidence gathering were created in the context of a physical world. These rules may be insufficient to safeguard the forensic soundness of evidence gathering methods. Inadequacies of current procedures may be especially visible in the context of transborder digital evidence gathering from online open sources. This article describes the practical shortcomings of Polish criminal evidence law in the context of digital evidence with particular attention to online open-source materials. Empirical data indicate that existing legal limitations are bypassed in practice to enable evidence collection. This unfortunately often happens at the expense of the forensic soundness of digital evidence.

Deputies of the General Sejmik Ruthenian Voivodeship at the Coronation Sejm of 1669

Studies of Sejmiks or local parliaments and their influence on the political, military and socio-economic life of the early modern Polish-Lithuanian Commonwealth are widely represented in modern European historiography. Pre-Sejm sejmiks were convened by the king who sent a writ to each sejmik, outlining the reasons the next Sejm would be held.In August 1669, the General Sejmik of the Ruthenian Voivodeship took place in Vyshnia, at which elect six representatives (traditionally two deputies, each from the Lands of Lwow, Przemysl, and Sanok) to the Coronation Sejm of Michael I. The main idea of the article is to show biographies of the six deputies of the Ruthenian Voivodeship. The paper is based on the source materials of the General Sejmik the second half of the 17th century demonstrates the place of their representation in their public and political activities. Sejmiks gave the opportunity for the career development of local nobility for politician’s beginners and experienced public figures. The role of the deputies was honourable and responsible, as the elected represented the interests of the whole voivodeship. Participation in the work of the Sejm provided an opportunity to join the discussion of important issues of the domestic and foreign policy of the Polish–Lithuanian Commonwealth. However, authority in the local noble society was not the only criterion for election to the embassy, no less important factor was the client-patron relationship. Lot of nobility belonged to family and political groups led by senators and magnates and defended their interests at the Sejmik and Sejm. Among the six ambassadors elected at the General Sejmik, there were representatives of magnate families and experienced parliamentarians who regularly participated in the Sejm.

Mercury isotopic compositions in fine particles and offshore surface seawater in a coastal area of East China: implications for Hg sources and atmospheric transformations

Isotopic compositions of Mercury (Hg) in atmospheric particles (HgPM) are probably the mixed results of emission sources and atmospheric processes. Here, we present Hg isotopic compositions in daily fine particles (PM2.5) collected from an industrial site (Chunxiao – CX) and a nearby mountain site (Daimeishan – DMS) in a coastal area of East China, and in surface seawater close to the industrial area, to reveal the influence of anthropogenic emission sources and atmospheric transformations on Hg isotopes. The PM2.5 samples displayed a significant spatial difference in δ202Hg. For the CX site, the negative δ202Hg values are similar to those of source materials, and the HgPM contents were well correlated with chemical tracers, indicating the dominant contributions of local industrial activities to HgPM2.5, whereas the observed positive δ202Hg at the DMS site was likely associated with regional emissions and extended atmospheric processes during transport. The Δ199Hg values in PM2.5 from the CX and DMS sites were comparably positive. The unity slope of Δ199Hg versus Δ201Hg over all data suggests that the odd mass independent fractionation (MIF) of HgPM2.5 was primarily induced by the photoreduction of Hg2+ in aerosols. The positive Δ200Hg values with a minor spatial difference were probably associated with the photooxidation of Hg0, which is generally enhanced in the coastal environment. Total Hg in offshore surface seawater was characterized by negative δ202Hg and near-zero Δ199Hg and Δ200Hg values, which are indistinguishable from Hg isotopes of source materials. Overall, the PM2.5 collected from industrial areas had comparable δ202Hg values but more positive Δ199Hg and Δ200Hg as compared to surface seawater. The results indicate that atmospheric transformations would induce the significant fractionation of Hg isotopes and obscure the Hg isotopic signatures of anthropogenic emissions.