Glass Objects Research Articles

A destruição dos restos da destruição: Pompeia e Herculano no Museu Nacional do Rio de Janeiro

Belonging to the Teresa Cristina Collection, pieces from Pompeii and Herculaneum were part of the permanent exhibition at the National Museum when the institution was destroyed by a devastating fire in September 2018. Those material remains of Roman cities buried by Vesuvius in 79 CE - frescoes, bronze jewelry, amulets, glass, lamps, and other objects of everyday life - remained under thick layers of eruptive material for almost two thousand years. Rescued in successive archeological excavations throughout the 18th and 19th centuries and, finally, made into a museum, they returned to the ashes, this time from fire. The history of the formation of this collection is linked to the second reign by close political links. Thus, what we intend to do is look at the long trajectory of these pieces, seeking to examine the symbolic uses to which they were subject in nineteenth-century Rio de Janeiro.

The glass from the arrabal of Arrixaca (Murcia, 12th-13th centuries)

This article presents an assemblage of 36 glass samples excavated in the urban site of San Esteban, part of the arrabal of Arrixaca (Murcia) (in al-Andalus, an arrabal was a relatively dense urbanised area outside the city walls) in contexts securely dated to the 12th and early 13th century, spanning the rule of Ibn Mardanīš, and the early period of Almohad domination in the city. The samples were analysed by electron microprobe (EMPA) for major and minor elements and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) for trace elements. The results are examined within the context of glass production, circulation, and consumption in al-Andalus and the Islamicate Mediterranean more broadly. The results show that some of the glasses found in San Esteban-Arrixaca may have been imported from other Islamicate regions (Egypt and Mesopotamia), but that the vast majority can be related to previously recognised compositional Iberian glass groups. At the same time, the identification of several fragments of production waste and raw glass suggest that some glass-working facility may have existed in the vicinity of San Esteban-Arrixaca. The compositional evidence also indicates that recycling (including of imported glass objects) may have been a fairly common practice in Andalusi glassmaking, but it is suggested that some of the usual chemical markers of recycling may, in the case of al-Andalus and perhaps also elsewhere in the medieval Mediterranean, be the result of the cross-breeding of glass- and glaze-making activities.

ISOLASI DAN INTENSITAS SERANGAN PENYAKIT BULAI (Peronosclerospora philippinensis Shaw) PADA TANAMAN JAGUNG (Zea mays L.) DI KABUPATEN MAROS

This study aims to determine the isolation and intensity of downy mildew (Peronosclerospora philippinensis) on maize (Zea mays L.) in Maros Regency during the 2022 planting period. This research was carried out on agricultural land in Pucak Village, Tompobulu District, Maros Regency and at the Pest Laboratory. and Diseases of the Indonesian Muslim University and the Hasanuddin University Disease Laboratory. This research was carried out for 3 months, starting from June to August 2022. The materials and tools used were leaves that were attacked by downy mildew, 2% sugar water, methylene blue, aquades, microscopes, scissors, glass objects, masking tape, tissue towels, plastic clips, camera and stationery. This study uses a survey method by direct observation in the field. Downy mildew leaves are taken and then taken to the laboratory to identify the fungus that causes downy mildew. Based on microscopic observations, Peronosclerospora philippinensis species were found with ovoid shape and thin walls. The results of the observation that the intensity of downy mildew in the field in the first month was 20% with the moderate attack intensity category, then in the second month it increased to 70.2% with the severe category and in the third month which was the highest attack intensity with an average of 96.7%. with the puso category which means that of the 30 plants observed, 29 were attacked by downy mildew. The attack intensity which reaches 96.7% can no longer be used as a seed source.

Beads of Alexandria: Non‐invasive analysis of glass from Roman, Late Antique and Islamic Kom el‐Dikka, Egypt

AbstractWritten sources indicate that Alexandria in Egypt was a leading producer of Roman glass. Furthermore, archaeological finds have provided evidence for the local production of drawn glass and gold‐in‐glass beads, which were distributed throughout the world. In this study, we present an analysis of the chemical composition of more than two hundred glass objects from the Roman (2nd–3rd/4th century ce) and Late Antique (4th/5th–7th century ce) glass bead workshops located at Kom el‐Dikka in Alexandria. This study is based on the results of portable X‐ray fluorescence (pXRF) analyses carried out on raw glass, bead semi‐products, products and waste from both periods. Additionally, the glass chemistry of some Islamic (8th–12th century ce) beads found at the site has been analysed.Despite the limitations of the method, the vast majority of samples exhibited compositions confirming their general dating and Egyptian origin. Remarkably, a single bead was made of high‐alumina glass and appeared to be an import from India, possibly a remnant of the Indo‐Pacific glass bead route that connected Red Sea ports and Europe in Late Antiquity. In addition, we offer a new analytical approach to the method that has potential to enhance the value of pXRF in the analysis of archaeological glass.

Back to black: Analysis of the earliest natron glass found in Italy

An assemblage of black-appearing glass objects (predominantly beads) that is dated to the 9th–7th centuries BCE and found in Iron Age contexts of Southern Etruria and Latium (central Italy) was analysed using portable X-ray fluorescence spectrometry, laser ablation – inductively coupled plasma – mass spectrometry and micro-Raman spectroscopy. The analytical approach allowed us to discuss the technology of glass-making in a period of relevant technological changes. It resulted that the glass that reached the Italian peninsula was somewhat different, from a compositional point of view, from both earlier and later periods. The data collected showed that iron – the main colouring agent for these glasses – was obtained from several sources as was silica – the main component of glass. Lime, one of the main constituents of many types of glass, plays a modest role in this assemblage, which places these samples in a special position because of the peculiar batch formula. At least three centres of raw glass production are suggested by the compositional data, but in each case the glass was imported to the Italian peninsula.

Prediction and classification of chemical composition of ancient glass objects based on generalized Shapley functions.

Ancient glass products have suffered from the baptism of time and experienced changes in the burial environment and weathering, resulting in a change in the proportions of their chemical composition and interfering with their accurate identification by later generations. In this paper, the chemical composition of ancient glass products is predicted and identified. First, the multivariate statistical ANOVA test is applied to explore the relationship between whether the cultural relics samples are weathered or not and the glass type, decoration, and color to derive a law of chemical composition of the cultural relics and to analyze the correlation and difference among the four factors. Second, compared with the relevant data of the existing glass products, the missing values are processed by using the method of filling in the plurality. The weathering condition of the sampling points of the samples whose surfaces are not weathered is judged by the "distance discrimination method." Combined with the characteristics of the lead-barium glass and the high-potassium glass, the law of the chemical composition content on the surface of the samples, weathered or not, is explored. The modeling of the gray prediction method was applied again to predict the chemical composition content before weathering. Finally, the generalized Shapley function of fuzzy measurement was used to analyze the correlation between indicators and the chemical compositions and their differences. The scheme proposed in this paper can solve the difficult problem of category judgment in archeology, which is of great significance in promoting the smooth progress of archaeological work.

One-photon three-dimensional printed fused silica glass with sub-micron features

The applications of silica-based glass have evolved alongside human civilization for thousands of years. High-precision manufacturing of three-dimensional (3D) fused silica glass objects is required in various industries, ranging from everyday life to cutting-edge fields. Advanced 3D printing technologies have emerged as a potent tool for fabricating arbitrary glass objects with ultimate freedom and precision. Stereolithography and femtosecond laser direct writing respectively achieved their resolutions of ~50 μm and ~100 nm. However, fabricating glass structures with centimeter dimensions and sub-micron features remains challenging. Presented here, our study effectively bridges the gap through engineering suitable materials and utilizing one-photon micro-stereolithography (OμSL)-based 3D printing, which flexibly creates transparent and high-performance fused silica glass components with complex, 3D sub-micron architectures. Comprehensive characterizations confirm that the final material is stoichiometrically pure silica with high quality, defect-free morphology, and excellent optical properties. Homogeneous volumetric shrinkage further facilitates the smallest voxel, reducing the size from 2.0 × 2.0 × 1.0 μm3 to 0.8 × 0.8 × 0.5 μm3. This approach can be used to produce fused silica glass components with various 3D geometries featuring sub-micron details and millimetric dimensions. This showcases promising prospects in diverse fields, including micro-optics, microfluidics, mechanical metamaterials, and engineered surfaces.

Transparency-Aware Segmentation of Glass Objects to Train RGB-Based Pose Estimators.

Robotic manipulation requires object pose knowledge for the objects of interest. In order to perform typical household chores, a robot needs to be able to estimate 6D poses for objects such as water glasses or salad bowls. This is especially difficult for glass objects, as for these, depth data are mostly disturbed, and in RGB images, occluded objects are still visible. Thus, in this paper, we propose to redefine the ground-truth for training RGB-based pose estimators in two ways: (a) we apply a transparency-aware multisegmentation, in which an image pixel can belong to more than one object, and (b) we use transparency-aware bounding boxes, which always enclose whole objects, even if parts of an object are formally occluded by another object. The latter approach ensures that the size and scale of an object remain more consistent across different images. We train our pose estimator, which was originally designed for opaque objects, with three different ground-truth types on the ClearPose dataset. Just by changing the training data to our transparency-aware segmentation, with no additional glass-specific feature changes in the estimator, the ADD-S AUC value increases by 4.3%. Such a multisegmentation can be created for every dataset that provides a 3D model of the object and its ground-truth pose.

A Study of Weathering and Classification Patterns of Glass Artifacts

Background: Ancient glass is very susceptible to the influence of the buried environment and weathering, in the weathering process, the internal elements of the glass and environmental elements for a large number of exchanges, resulting in a change in the proportion of its composition and thus affecting the correct judgment of its category.This paper discusses the identification of ancient glass artifacts (high-potassium glass and lead-barium glass) in relation to the effects of weathering, the statistics and patterns of content, and the study of issues related to the classification of types.
 Methods: The data were obtained from the data set of Question C of the 2022 Gaoxueshe Cup National University Student Mathematical Modeling Competition. After eliminating the invalid data, analytical methods such as association rule analysis, factor analysis, cluster analysis, and algorithms such as Apriori and K-means++ were used for problem solving.
 Results: A total of 56 glass artifacts and 56 artifact sampling sites were included in the study, and the main findings were as follows: the relationship between the weathering of the surface of glass objects and their glass type, decoration, and color under the two-, three-, and four-correlation rules; the classification of glass objects into high-potassium or lead-barium glass based on the five compositional categories (SiO2, PbO, CaO, Fe2O3, and K2O); and the clustered dendrograms. The most homogeneous classification of high-potassium or lead-barium glass into each of the three subcategories was based on magnesium oxide and aluminum oxide, whose content varied considerably before and after the weathering process; and finally, changes in the chemical compositional correlation between the different categories were also analyzed.
 Conclusion: Solved the problems related to the identification of the composition of this batch of ancient glass artifacts in relation to the effects of weathering, the statistics and patterns of the content, and the classification of the types.

Additive Manufacturing of Transparent Multi-Component Nanoporous Glasses.

Fabrication of glass with complex geocd the low resolution of particle-based or fused glass technologies. Herein, a high-resolution 3D printing of transparent nanoporous glass is presented, by the combination of transparent photo-curable sol-gel printing compositions and digital light processing (DLP) technology. Multi-component glass, including binary (Al2 O3 -SiO2 ), ternary (ZnO-Al2 O3 -SiO2 , TiO2 -Al2 O3 -SiO2 ), and quaternary oxide (CaO-P2 O5 -Al2 O3 -SiO2 ) nanoporous glass objects with complex shapes, high spatial resolutions, and multi-oxide chemical compositions are fabricated, by DLP printing and subsequent sintering process. The uniform nanopores of Al2 O3 -SiO2 -based nanoporous glasses with the diameter (≈6.04nm), which is much smaller than the visible light wavelength, result in high transmittance (>95%) at the visible range. The high surface area of printed glass objectives allows post-functionalization via the adsorption of functional guest molecules. The photoluminescence and hydrophobic modification of 3D printed glass objectives are successfully demonstrated. This work extends the scope of 3D printing to transparent nanoporous glasses with complex geometry and facile functionalization, making them available for a wide range of applications.

Application of machine learning to object manipulation with bio-inspired microstructures

Bioinspired fibrillar adhesives have been proposed for novel gripping systems with enhanced scalability and resource efficiency. Here, we propose an in-situ optical monitoring system of the contact signatures, coupled with image processing and machine learning. Visual features were extracted from the contact signature images recorded at maximum compressive preload and after lifting a glass object. The algorithm was trained to cope with several degrees of misalignment and with unbalanced weight distributions by off-center gripping. The system allowed an assessment of the picking process for objects of various mass (200, 300, and 400 g). Several classifiers showed a high accuracy of about 90 % for successful prediction of attachment, depending on the mass of the object. The results promise improved reliability of handling objects, even in difficult situations.

Composition analysis and identification of ancient glass objects based on AdaBoost and CART classification tree

Ancient glass is highly susceptible to weathering by the burial environment, and a series of chemical reactions will occur in the process, which leads to changes in the chemical composition of glass artifacts. In order to identify and classify the composition types of glass artifacts, this paper uses high potassium glass and lead-barium glass as target training models to derive CART stump (CART tree with only 2 layers) combinations as a way to analyze the classification laws. Then, we analyzed the sub-classification results of weathering, color, and ornamentation, and analyzed the classification rules according to their chemical composition, and came up with the classification method based on CART stumps. In order to identify the type of unknown types of glass, this paper uses an integrated learning algorithm model based on CART classification tree and AdaBoost to train a prediction model using all the samples, with the objective of artifact type, and then performs type prediction on the data. This study is important for the correct classification of glass types.

Clean-Up Workers (Deluxe Series): The Embodiment of Waste Values and Aesthetics

Written from the perspective of practice-led research, this reflective case study rationalises and charts the production of ‘Clean-Up Workers (Deluxe Series)’—mixed media sculptures that embody notions of waste aesthetic, value and abjection. Integrating discourses surrounding waste theory and using the sink and plug as a metaphor to discuss Lacan’s theory of the objet petit a, the paper is presented as an autobiographical waste narrative. Production of a series of anatomical vacuum cleaners made from re-appropriated artwork found waste materials in the form of ‘pre-owned objects or materials’ and ‘by-products’ of a creative practice’, sit alongside crafted luxurious glass objects and speak of corporeal ageing, dysfunction and the domestic realm. Discarded objects take the form of car parts found in the non-places of the gutter. Through assemblage, these unique items’ ‘use-time’ is recontextualised and elevated as art objects viewed within a gallery arena.

Photonic crystals built by time in ancient Roman glass

Ancient glass objects typically show distinctive effects of deterioration as a result of environmentally induced physicochemical transformations of their surface over time. Iridescence is one of the distinctive signatures of aging that is most commonly found on excavated glass. In this work, we present an ancient glass fragment that exhibits structural color through surface weathering resulting in iridescent patinas caused by silica reprecipitation in nanoscale lamellae. This archaeological artifact reveals an unusual hierarchically assembled photonic crystal with extremely ordered nanoscale domains, high spectral selectivity, and reflectivity (~90%), that collectively behaves like a gold mirror. Optical characterization paired with nanoscale elemental analysis further underscores the high quality of this structure providing a window into this sophisticated natural photonic crystal assembled by time.

Viking Age Windows

In the last 25 years a conspicuous amount of plane glass – windowpane fragments – has surfaced on archaeological sites from the Viking Age. These finds have not received scholarly attention as they are not recognised as a genuine prehistoric (i.e. pre-1050 Scandinavia) occurrence. This paper aims to investigate a select group of archaeological localities that all have a significant amount of glass objects and fragments, and which also serve as mainstays for continental influences, commercial trade, as well as ritual activities. It offers the study of the chemical composition of these windowpane fragments, their distribution, provenience, and discusses their potential use as windows in Viking Age Scandinavia. Based on the chemical composition of the analysed plane glass (via LA-ICP-MS) the paper argues, firstly, that the glass most likely should be dated to the 9th to 11th centuries; secondly, that there are two possible import paths of raw material with one recognized at the early emporia based on east Mediterranean types of glass, and another with a continental type of glass found at the aristocratic sites. Finally, the paper argues that the windowpanes very likely could have been used in contemporary glassed windows placed in wooden buildings at these sites.

Peculiar challenges of a glass object retained in rectum: review of current options

Rectal foreign bodies are rare and often challenging. It can vary from soft toys to hard glass or wooden objects. Patients are mostly habitual offenders who generally present to emergency due to retained foreign body or complications like perforation or bleeding. Proper history with a plain X-ray is often enough for the diagnosis and position of the foreign body. However, management can be varied from a simple trans-anal retrieval to an exploratory laparotomy. Minimal invasive techniques also have a role in current scenario. We report an unusual glass foreign body with its opening placed caudally.

Cross-Cultural Encounters: Religious Motifs in Lattimo Glass from China to Italy

This paper focuses on lattimo glass, also known as milk glass, and analyzes the influence of Chinese porcelain on its creation in Venice through the study of its transmission path and revival. It also explores the role of religion in the glass trade between China and Italy from the fifteenth to the eighteenth centuries, with a particular focus on religious iconography. By relying on previous research on the religious iconography of glass during this period and analyzing precious glass objects, this paper aims to examine the brief popularity and decline of lattimo glass as an imitation of Chinese Ming porcelain in the fifteenth to sixteenth centuries, as well as the significance and impact of religious iconography on lattimo glass during the eighteenth century. The paper approaches the process of the introduction of Chinese aesthetics in Europe during this period from three angles: the origin of lattimo glass, the cross-media imitation and innovation of Chinese religious iconography, and cultural interaction. This process highlights the crucial role of influential religious imagery in the formation of cross-cultural communication.

Classification of ancient glassware based on K-means and decision trees

In this paper, the relation between the chemical composition of different types of glass objects was analyzed, and the differences between the chemical compositions were used to classify the glass objects, mainly by K-means, decision tree, and Euclidean distance analysis. For the classification of glass artifacts, this article analyzed the chemical composition of different types of glass artifacts and the changes of chemical composition before and after weathering, and then obtained the differences of chemical composition of different types of glass artifacts to obtain the classification law. The model was tested for reasonableness by giving the classification criteria, and the sensitivity of the model was determined by the change in the number of classification species K.The sensitivity of the model was analyzed by calculating the Euclidean distances between the object and the cluster centers, and the variance of the model by calculating the Euclidean distances between the object and the cluster centers before and after the weathering of the glass objects.

GLASS OBJECTS OF THE RUS PERIOD FROM VSHCHIZH (BASED ON THE 2014–2015 WORKS IN THE POSAD AND OUTER TOWN)

The town of Vshchizh in Rus has been known from chronicles since 1142. In the middle of the 12th century, it turned from a small border fortress into the capital of a small apanage principality, a vassal to Chernigov. In 1238, the city was ravaged by the troops of Batu and ceased to function as an urban settlement. The article considers glass objects of the Rus period found in the outer town and the posad (suburb) of Vshchizh (the total number is 198 objects). The overwhelming majority of this number is represented with bracelets (186 objects). In addition, there are six beads, four fragments of finger-rings and fragments of two vessels. Most of the finds (182 objects) are products of glass-making craft of Rus, the rest (16 fragments of bracelets) are attributed to Byzantine manufacture. The bulk of glassware dates back to the second half of the 12th – first third of the 13th century AD, and only a small number of items existed, possibly, in the second half of the 13th–14th century AD.

Die vielen Hände des Émile Gallé: Produktionsszenarien der Glaskunst um 1900 zwischen Hand, Kopf und Maschine

Abstract This essay examines the display of artistic labour embedded in Émile Gallé's glass objects. As a starting point, it takes the telling discrepancy between Gallé's representation as an artist working in the solitude of his studio in the well-known portrait painted by Victor Prouvé in 1892 and the actual involvement of many hands organized under a strict division of labour in his glass manufactory. His glass objects thus exist somewhere between the logic of the singular work of art and that of serial production. The essay looks closely at Gallé's exhibition practice at the Salon du Champ-de-Mars as well as at his public statements about the making of his glass works in order to trace contemporary negotiations of the relationship between art and industry and, more broadly, notions of what constituted an adequate modern art around 1900.