Dark Ages Research Articles

A Historic and Aesthetic Comparison Analysis of Greek "Dark Age" Geometric Pottery and Chinese Ritual Bronzes

A Historic and Aesthetic Comparison Analysis of Greek "Dark Age" Geometric Pottery and Chinese Ritual Bronzes

Palaeoecological Conditions in the South-Eastern and Western Baltic Sea during the Last Millennium

We present the reconstruction of palaeoenvironmental conditions in the Gdansk, Bornholm, and Arkona Basins of the Baltic Sea over the last millennium. A multiproxy study (including geochemical, XRF, grain size, AMS, and micropalaeontological analyses) of five short sediment cores was performed. The relative age of the sediments was determined based on the Pb distribution along the sediment sequences, as radiocarbon dating has resulted in an excessively old age. The retrieved cores cover two comparable warm periods, the Medieval Climate Anomaly and the Modern Warm Period, for which the increase in surface water productivity was reconstructed. Notably, the production of diatoms was higher during the colder periods (the Dark Ages and Little Ice Age), but this was also the case within the Modern Warm Period. In the Gdansk Basin, the initial salinity increase during the Littorina transgression started after 7.7 cal. a BP. The increased inflow activity was reconstructed during the Medieval Climate Anomaly, even in the Gdansk Basin, despite, in general, very low foraminiferal amounts and diversity. The strongly positive North Atlantic Oscillation Index during this period led to the prevalence of westerly winds over the Baltic region and stronger saltwater intrusions. In the recent sediments, the reconstructed inflow frequency demonstrates a variability against the reduction trend, and a general decline compared to the Medieval Climate Anomaly is seen.

Dark Age Consistency in the 21cm Global Signal.

We propose a new observable for the 21cm global signal during the dark ages, "the dark age consistency ratio," which could serve as a critical test of models beyond the standard Λ cold dark matter (ΛCDM) model, particularly in future missions using a telescope on the moon or satellite orbiting around the moon. The new observable is motivated from the fact that the shape of the functional form of the 21cm signal against the frequency is almost cosmological-parameter independent in the ΛCDM. The dark age consistency ratio takes a certain definite value in the ΛCDM case, which enables us to easily falsify models beyond the standard model motivated by some particle physics and gravity theories. The new observable just needs measurements of the brightness temperature at a few frequency bands during the dark ages, and thus it allows us to test cosmological scenarios even with limited information on the 21cm global signal at the early stage of future lunar missions.

Georgian Graffito from Nessana, Dating to the ‘Dark Age’ of Christianity in Palestine

ABSTRACT This report is dedicated to an ancient Georgian graffito from Nessana in the Negev, an important pilgrimage hub of the Byzantine and Early Islamic periods. The graffito was discovered and documented by the inspector of the British Mandatory Department of Antiquities, P.L.O. Guy and was later lost. The only documentation for this graffito was found in the archival materials of the Department and was never published. The inscription is palaeographically dated to a relatively late period, the ninth–tenth centuries CE, and together with other recently discovered epigraphic finds from the region, testifies to the continuation of the Christian pilgrimage to the Holy Land and Sinai well into the early Middle Ages.

Quantifying the Effect of Basic Minerals on Acid- and Ligand-Promoted Dissolution Kinetics of Iron in Simulated Dark Atmospheric Aging of Dust and Coal Fly Ash Particles.

The content and multiphase chemistry of iron (Fe) in multicomponent atmospheric aerosols are important to global climate and oceanic models. To date, reported dissolution rates of Fe span orders of magnitude with no quantifiable dependency on the content of basic minerals that coexist with Fe. Here, we report dissolution rates of Fe in simulated dark atmospheric aging of fully characterized multielement particles under acidic conditions (bulk pH 1 or 3) with and without oxalic acid and pyrocatechol. Our main findings are (a) the total amount of Ca and Mg was higher in coal fly ash than in Arizona test dust, (b) Fe dissolution initial rates increased exponentially with %Ca/Al and %Mg/Al below 50%, (c) a reduction in the Fe dissolution initial rate was observed with %Ca/Al higher than 50%, (d) reactive Ca and Mg minerals increased the calculated initial pH at the liquid/solid interface to values higher by only 1.5-2 units than the measured bulk pH, yet interfacial water remained acidic for Fe dissolution to take place, and (e) reactive Ca and Mg minerals enhanced the deprotonation of organics at the interface, aiding in ligand-promoted dissolution of Fe. The impact of these results is discussed within the context of constraining Fe dissolution kinetic models.

The Historical Sustainable Cities In India: A Survey Of Sustainable Practices Followed In Cities Of India In Ancient And Medieval Times

The role played by India in achieving the sustainable development goals by 2030 is extremely crucial owning to its large but impoverished population. It is necessary for India to achieve these goals so that the world can achieve them. India is currently lagging in many of the goals, targets and sub-targets. But there was a time when India was the centre of sustainable lifestyle. Indian cities were well planned with remarkable sanitation and cleanliness. The excellent drainage system of Harappan cities is well known to everyone. The cities were divided into various layers with the most important structures located on citadel. The great bath of Mohenjodaro, the great granary of Harappa, the water conservation tank of Dholavira and the dockyard of Lothal are living examples of sustainable practices in those sustainable cities. The imperial city of Pataliputra is another example of a sustainable city. The city administration comprised of thirty members which was divided into six committees. There was a separate committee for registration of births and deaths. Similarly, the life of Kanyakubja as described by Hiuen Tsang reflects the sustainable lifestyle of the ruler as well as the people of the city. The early medieval age was categorized as dark age by many historians. But these ages have also produced remarkable cities. Anhilwada (present day Patan, Gujarat) was capital of Solanki dynasty of Gujarat in which we can find Rani-ki-Vaav which is an excellent water conservation tank accessible to the population of the city. Similarly, Bhoj of Parmar dynasty constructed several lakes, tanks and ponds in his capital city Dhar. It was the imperial city of Vijayanagar that can be described as textbook example of a sustainable city. The city was surrounded by seven walls. The agricultural farms in the vicinity which fed the city were fortified. The city was well planned into residential, commercial and military areas. This paper analyses the sustainable structures, practices and lifestyle that existed in the prominent cities of ancient and medieval India.

Strong observational support for the [formula omitted] timeline in the early universe

JWST’s recent discovery of well-formed galaxies and supermassive black holes only a few hundred Myr after the big bang seriously challenges the timeline predicted by ΛCDM. Now, the latest identification of polycyclic aromatic hydrocarbons (PAHs) at z=6.71, together with these earlier inconsistencies, makes the time compression problem in this model quite overwhelming. We consider the timeline associated with the formation and growth of PAH grains based on current astrophysical models and argue that their appearance at z=6.71 favors the structure formation history in Rh=ct rather than that of Planck-ΛCDM. We estimate the time at which they must have started growing in each case, and then trace their history through various critical events, such as the end of the ‘dark ages’, the beginning of Pop III star formation, and the onset of reionization. Together, these three distinct discoveries by JWST, viz. high-z galaxies, high-z quasars and the surprisingly early appearance of PAHs, all paint a fully consistent picture in which the timeline in ΛCDM is overly compressed at z≳6, while strongly supporting the expansion history in the early Universe predicted by Rh=ct.

1500-Year Sedimentary Records of the East Asian Summer Monsoon and Yellow Sea Warm Current from the Muddy Area of the North Yellow Sea, China

Advances in reconstructing the East Asian monsoon have provided important insights into the natural climate variability in Asia during the pre-instrumental period. However, there are still unresolved paleoclimate issues that necessitate the use of geological proxy data to further our understanding of past climate changes. This study focused on core B13, located in the muddy area of the North Yellow Sea (NYS), to investigate the evolutionary history over the past 1500 years and reconstruct the records of the East Asian summer monsoon (EASM) and Yellow Sea warm current (YSWC). The mean grain size of sediment ranged from 4.2 Φ to 5.6 Φ, with the sorting coefficient ranging from 1.9 to 2.2, indicating poor sorting. The C–M pattern showed a limited range of values, with the M values being between 33 and 83 μm and the C values being between 165 and 287 μm, suggesting uniform-suspension transport. The L* index ranged from 40.41 to 44.12, while the a* and b* indexes ranged from 0.55 to 1.78 and 2.86 to 5.94, respectively. A stable and relatively strong sedimentary environment is indicated through a comprehensive analysis of the C–M plot, triangular plot, the relationship between the mean grain size and sorting, and the changes in grain-size and color parameters. The sedimentary evolution in the muddy area of the NYS over the past 1500 years can be categorized into three distinct stages. In this study, proxies for the EASM and YSWC were extracted using the VPCA method from the sediment grain size and diffuse spectral reflectance (DSR) data, respectively. The reliability of these proxies has been confirmed through comparison with other validated proxies. The results indicated that the strength of the EASM and YSWC also exhibited three stages, corresponding to the Dark Ages Cold Period (DACP), Medieval Warm Period (MWP), and Little Ice Age (LIA), respectively. On a centennial scale, the correlation between the EASM and YSWC was predominantly negative. This research validates the reliability of the VPCA method for paleoclimate reconstruction, contributes important climate records in a special muddy area, and provides a new perspective on how to eliminate temporal errors in verifying the correlation between the two climate systems.

Portside-shipside interaction on shore-power installation: A perspective of tramp shipping deployment

Due to the high initial costs and the uncertain returns of investment, the efficient green technology in shipping industry, shore power (SP), is still in a developmental dark age, especially its installation at bulk terminals and ships. This study examines the factors influencing the SP installation for bulk terminals and ships, elucidates the impacting mechanisms of one party's installation on the investment returns of the other, and reveals the decisive role of fleet operations in the installation decisions of both parties and corresponding carbon emissions. Employing a dataset representing real-world shipping routes and cargo types, the ship-cargo matching and ships' port-of-calls within a planning horizon are optimized with the objective of maximizing the profit of tramp shipping business by taking SP installation and usage cost into account. Portside SP decision-making model is also conducted to estimate the revenue generated by portside SP usage, and guide portside installation decisions based on the cost-benefit ratio. Finally, recommendations are proposed for ship owner, port operator and government to collaboratively navigate through the dark age of SP development, supported by the further discussion regarding fuel-electricity price gap and port loading efficiency.

The Mālikī School of Law in Andalusia and Its Impact on the Development of European Legal Systems

Objectives: This article explores the history of the Mālikī school of law in Andalusia and its influence on European laws. The study opens with the period of the Muslim conquest of Andalusia, aiming to highlight the various schools that existed before the emergence and spread of the Mālikī school and its impact on European laws. Methodology: This article uses a descriptive analysis, drawing on early and contemporary Islamic sources. Its goal is to trace the spread of the Mālikī school of law in Andalusia and analyse its influence on European laws. Findings: This article demonstrates how the Mālikī school of law influenced modern European laws that modified this jurisprudence and integrated it into their legal systems, such as the French Civil Code. Such was the result of a substantial interaction between Muslims and non-Muslims following the Islamic conquest of Andalusia. Consequently, the article concludes that introducing the Mālikī school of law into Andalusia substantially impacted European laws and systems. Originality: This article discusses the entry of Muslims into Andalusia during the European Dark Ages. It elucidates how the conquest of Andalusia affected the Andalusians and that Islamic civilisation and the Mālikī school of law influenced most of Europe's nations as well.

Recovering 21cm Monopole Signals Without Smoothness

We expect the monopole signal at the lowest frequencies below 100MHz to be composed to two components: the deep Rayleigh-Jeans tail of the cosmic microwave background and two distinct features: the dark ages trough at ∼17MHz and the cosmic dawn trough at ∼75Mhz. These are hidden under orders of magnitude brighter foregrounds whose emission is approximately a power-law with a spectral index ≈−2.5. It is usually assumed that monopole signals of interest are separable from foregrounds on the basis of spectral smoothness. We argue that this is a difficult approach and likely impossible for the Dark Ages trough. Instead, we suggest that the fluctuations in the foreground emission around the sky should be used to build a model distribution of possible shapes of foregrounds, which can be used to constrain presence of a monopole signal. We implement this idea using normalizing flows and show that this technique allows for efficient unsupervised detection of the amplitude, width and center of the Dark Ages trough as well as Rayleigh-Jeans tail of the cosmic microwave background for a sufficiently sensitive experiment. We show that achromatic and smooth response significantly helps with foreground separation. We discuss the limitations of the inherent assumptions in this method and the impact on the design of future low-frequency experiments.

Climate shifts during the Dark Ages and medieval Warm Period

Climate shifts during the Dark Ages and medieval Warm Period

Late Holocene vegetation dynamics: degree and regional patterns of the Dark Ages woodland regeneration (ad 300–700) in the Netherlands

AbstractDuring the Dark Ages, which include the Late Roman period (ad 270–450) and the Early Middle Ages (ad 450–1050), large-scale vegetation development in northwest Europe was characterised by widespread regeneration of woodlands. This regeneration phase represents a break from the extensive reduction in woodland from human activities in late Holocene vegetation history. In the Netherlands, possible causes for this reversal can be found in a decreased human impact on the landscape, a colder and possibly wetter climate, and geomorphological changes. This paper presents a synthesis from 38 pollen records from a range of sites across the Netherlands, from which regional differences in the degree of woodland regeneration and vegetation composition before and during the Dark Ages have been identified. Both original data as well as vegetation abundance modelled by REVEALS were used to assess the regrowth of the woodland cover. The observed trends were considered in terms of the landscape setting and population estimates in order to disentangle the relative importance of these forcing factors. The results indicate that landscape and human impact were the most important factors determining the vegetation structure and changes to it. The pollen data show that in the Netherlands, the clearance of woodland in the Roman period followed by its regrowth afterwards were greatest in the river area. This can be linked to a high population density there during the Roman period followed by a strong decrease of population in the Dark Ages and to increased flooding.

Climate variability in northern Africa during the late Holocene: A multiproxy perspective from El-Beida Lake (Wadi El-Natrun, Egypt)

North Africa is a key region hosting ca. 230 million people that are dependent on climate to maintain their subsistence through agriculture. Because of the current global changes, understanding the mechanisms behind the climate variations that occurred in this region is extremely important. To contribute to a more accurate modelling projection, we reconstructed the paleoclimatic and paleoenvironmental variations from the Meghalayan (∼1,500 ka) to recent using palynological and geochemical data from a sediment core from El-Beida Lake (Wadi El-Natrun area, north Western Desert of Egypt). North Africa underwent significant shifts in climatic conditions forced by different drivers since the Roman Warm Period (RWP) until recent. Our sediment core record indicates that this region experienced a persistent dry and warm climate during the RWP until the first half of the Medieval Climate Anomaly (MCA). The positive North Atlantic Oscillation was the main driver for controlling the precipitation pattern and pushing the precipitation towards central and north Europe and favoring the dry climate in North Africa during the RWP. The dry and slightly cold conditions in the study area during the Dark Age Cold Period (DACP) can be ascribed to the coupling between the more southward position of the Azores Front and the weak Atlantic Meridional Overturning Circulation. Northern Africa showed variable climatic conditions during the Medieval Climate Anomaly (MCA) due to the complicated thermohaline circulation of the Mediterranean Sea. During this time, the Eastern Mediterranean experienced a cold or partially cold MCA that may be extended to the present study area. An abrupt change to humid and cold climatic conditions occurred in northern Africa during the Little Ice Age (LIA) due to large-scale processes like the ENSO and NAO. The SST warming of the North Tropical Atlantic (NTA), significantly influenced by ENSO, causes the position of the Atlantic ITCZ to be shifted northward affecting precipitation in Africa.

Khūrigān: a Recently Discovered Post-Achaemanid Rock-Cut Tomb near Naqsh-e Rostam, Iran

Abstract Near the northwestern-southeastern foothills of the Marvdasht plain in Fars province, lie a range of ancient necropoleis which date from the reign of Darius I, the Achaemenid king and until the first century after the Muslim conquest. The well-known necropoleis of Naqsh-e Rostam and Persepolis have the most complex tombs among them. However, there are other burials in this region, although smaller and simpler or even imitative, which have considerable archeological importance, since they provide information for the social and political understanding of their time of creation, often known as the dark ages. The present study aims to introduce and analyze the structural-chronological features of the rock-cut tomb of Khūrigān, one of the recent discoveries near Naqsh-e Rostam. Regarding the architectural and stylistic characteristics of the tomb and its context, as well as considering its archeological landscape and using historical information, the period from the last century of the Achaemenid reign until the beginning of the Sassanid dynasty is considered for the general chronology of this tomb; however, through applying a more detailed perspective, we can attribute the chronology of this tomb to the first half of the 3rd until the 1st century BC.

Utilizing excitation-emission matrix fluorescence spectroscopy and convolutional neural networks for dark tea brand and aging period identification

This study utilized excitation-emission matrix (EEM) fluorescence spectroscopy in conjunction with convolutional neural networks (CNNs) to identify the dark tea brands and their aging periods, which were both key factors of market value. The adaptation of EEM data to the CNN model was examined, encompassing the configuration of the data structure and the implementation of data augmentation. Three typical CNN models including AlexNet, GoogLeNet, and ResNet were evaluated. ResNet was selected because it demonstrated the highest classification accuracy on the test set and superior clustering performance in the t-SNE visualization of extracted features. Analysis of feature contribution suggested that the CNN model exhibited enhanced sensitivity towards the boundaries of the fluorescence region. Furthermore, transfer learning was proved to be effective in facilitating adaptation of dark tea recognition models to databases with different sample sizes, which was meaningful for the application of this method in dark tea market supervision. Finally, the multi-task model was developed and achieved a 96.9 % accuracy in brand identification and 87.5 % in aging period determination, suggesting the advantages of multi-task learning in enhancing model generalization and training efficiency.

The 4.2 ka event: A review of palaeoclimate literature and directions for future research

In recent years, much evidence has been presented on the 4.2 ka event. A review of 317 palaeoclimate papers shows that dry conditions were common during the event, especially from Eastern Mediterranean to India. The 4.2 ka event was not, however, a global drought event. Wet conditions were reported especially for central/northern Europe and sub-Saharan Africa. The 4.2 ka event is typically characterized either as short (4.2–4.0 ka) or long (4.4–3.8 ka) episode, possibly developing over an extended interval of time, in keeping with the North Atlantic forcing and correlating with the Bond 3 event of ice-rafted debris. This forcing is understood to drive a southward migration of the Inter-Tropical Convergence Zone (ITCZ), resulting in decreased rainfall over most of the Asian monsoon region, with possibility that an interplay of El Niño–Southern Oscillation (ENSO) and North Atlantic Oscillation (NAO) has modulated the global circulation. Cold conditions were also reported but less frequently, in comparison to other Bond events such as the 8.2 ka event, Dark Ages Cold Period and Little Ice Age. Some high-resolution records show a double peak structure of which two anomalies are tree-ring dated to 4.14–4.05 ka and 3.97 ka. Accurately and precisely dated high-resolution records indicative of various climatic variables, especially outside of the traditional study region (Mediterranean–Middle East–India–China), including reconstructions of the ENSO and NAO histories and ITCZ migrations, are crucially needed for rigorous examination of the global scale characteristics of the 4.2 ka event and its forcings. Such research seems to be just beginning.

THE MANIFESTATIONS OF LINGUISTIC RICHNESSIN ARABIC VOCABULARY DESCRIPTIVE STUDY

Every language has a wealth of vocabulary. However, this wealth varies from one language to another. Arabic is described as one of the most linguistically rich languages what qualified it to transmit the last message of heaven to earth (the Holy Quran), It carried the light of civilisation to Europe in the Dark Ages of the Middle Ages. Moreover, it was able to preserve for mankind the sciences of previous nations, then it became a pot for its outstanding scientific achievements in mathematics, astronomy, medicine, philosophy, etc. In addition to the pure Arabic sciences that arose with the dawn of Islam to preserve and understand the constitution of this nation, the Holy Quran. This enormous stock of Arabic vocabulary needs scientific treatment to identify the manifestations of its richness. Some make this enormous stock a point of pride that indicates the richness of the language by counting and listing it. On the contrary, others consider this abundance to be a burden that needs to be apologised for. The research concluded that the manifestations of linguistic richness in the Arabic vocabulary in terms of quantity are represented in its phonological diversity, its understood structure, and its abundant roots. As for the quality, is apparent in the accuracy of its semantics and the flexibility of its use.

Vegetation Changes and Dynamics of the Climate Variables in Southern Thailand over the Past 1500 Years

The Indo-Pacific, a vast biogeographic of Earth, is influenced by both the Indian and East Asian monsoons. Despite its geographical importance, this region has been less studied compared to East Asia and India. Here, we present speleothem records from southern Thailand that cover the last 1500 years, including a hiatus during the Little Ice Age, providing insights into the interactions among climate dynamics, human influences, and ecological responses to climate change. Notably, our records lack the characteristic cold and warm periods observed in other regions, such as the Dark Ages Cold Period and Medieval Warm Period, which may reflect the complexity of the tropical climate system or the region’s unique topography. The analysis reveals a link between ENSO multi-decadal variability and hydroclimate conditions in southern Thailand, as evidenced by speleothem δ18O. Furthermore, a comparison between speleothem δ13C and the Normalized Difference Vegetation Index (NDVI) indicates significant vegetation changes in the last three decades, corresponding with increased atmospheric CO2 levels and expansion of agricultural land due to human activities during the Current Warm Period. Additionally, our study suggests that an abrupt increase in sea surface temperatures may enhance vegetation growth in the Indo-Pacific by influencing atmospheric circulation and increasing precipitation.

Doing LGBTQ internet histories justice: a queer web archive manifesto

Despite the web’s revolutionary impact on LGBTQ communities, the preservation and study of LGBTQ web histories have been largely overlooked by archives and scholars. This neglect has contributed to a “queer digital dark age,” perpetuating the symbolic annihilation of LGBTQ people in the historical record. Drawing on an extensive review of queer archive and library studies literature, as well as a survey of curators of queer web archives, this article argues for urgent intervention. Specific actions are needed: heritage institutions should prioritise creating queer web collections, and scholars must begin consulting existing collections. Failure to address this undermines the representation of LGBTQ experiences and hinders our understanding of online LGBTQ life. By examining extant initiatives, specifically the LGBT + web archive of the National Library of the Netherlands, this article demonstrates the potential of studying queer internet histories through web archives. Such endeavours enable diachronic research and the application of computational methods like hyperlink analyses, revealing the interconnected nature of queer online cultures. Ultimately, this article advocates a collaborative dialogue between queer archival and librarian studies, web archive studies, and LGBTQ internet studies—which must lead to pressing steps to preserve and comprehensively examine LGBTQ online heritage.