Search Results (35)

This paper presents a 2-stage GaN Doherty power amplifier module (DPAM) on a compact $7\times 7$ quad flat no-lead (QFN) package, designed for the needs of 5G massive MIMO base transceiver systems. The interstage and input matching networks employ high-quality factor integrated passive devices (IPDs) to achieve a small form factor. This multi-chip module consists of three GaN-HEMT bare dies used for the driver stage, carrier amplifier, and peaking amplifier. Additionally, two IPD dies are included for the interstage and input matching networks. The external load network is developed using a printed circuit board (PCB). Utilizing a 5G NR signal of 100 MHz bandwidth and a 9.3 dB PAPR within the 3.4–3.8 GHz band, the developed DPAM demonstrated a power gain exceeding 26.8 dB and a power-added efficiency (PAE) greater than 37.8% at a 39 dBm average output power. Full article

This study analyzes the award-winning documentary film Searching for Rodakis, directed by Kerem Soyyilmaz, produced in 2023. The aim of this study is the historic comprehension and analysis of this filmic narrative in the field of social–semiotic literacy and its utilization in historical studies for approaching issues of conflict in modern history, otherness, collective experience and trauma, and collective memory. The research material is the documentary Searching for Rodakis (produced by Denmark, Turkey 2023; screenplay/director, Kerem Soyyilmaz; duration, 57’), which received the following awards: Adana Golden Boll FF 2023 Turkey | Best Documentary, Thessaloniki International Doc. Festival 2023 Greece, Greek Film Festival Los Angeles 2023 USA, and Istanbul Documentary Days 2023 Turkey. As regards the historic context, the year of production, 2023, coincides with the 100th anniversary of the signing of the Treaty of Lausanne, where Turkey’s current borders were set and the “population exchange” legally sealed, i.e., the violent expulsion of 400,000 Muslims, citizens of Greece, many of whom spoke only Greek, and 200,000 Orthodox citizens of Turkey, who in the majority spoke Turkish. At the same time, the Treaty of Lausanne ratified and finalized the expulsion of approximately one million Orthodox who were forced to leave the Ottoman Empire, as well as 120,000 Muslims who had fled Greece since the beginning of the Balkan Wars (1912–1913). About two million people were deported and lost their citizenship and property, in the context of “national homogeneity” (which connotes an ethnic cleansing), with the official states ignoring the criticisms of lawyers and academics who spoke of violations of constitutional rights. Mohammedan Greeks, estimated at around 190,000 as early as 1914, based on ecclesiastical statistics in the Pontus region, did not receive attention from the provisions of the Treaty of Lausanne, even though linguistically and culturally (origin, customs, culture and traditions) they did not differ in any way from the Orthodox Greeks. In Turkey, there was general indifference to the thousands of desperate people who arrived, with the exception of a few academics and the Lausanne Exchange Foundation. The filmic scenario is as follows: as a Greek tombstone of unknown origin is discovered underneath the floorboards in an old village house in Turkey, an almost forgotten story from the country’s creation unravels—the forced population exchange between Greece and Turkey in 1923. The engraved Greek letters tell of a woman, Chrysoula Rodaki, who died in 1887. Thus the search for her descendants begins. It leads director Kerem Soyyilmaz to local archives, where his own family’s role in history is laid bare; to abandoned ghost towns, and through the memories of older villagers—all while Soyyilmaz meets massive support for his quest from Greeks on the other side of the border. The stone becomes a portal to the past—and for a while, the trauma becomes redeemed when the previous owners of the village house return. Searching for Rodakis is a movie that reconnects people, culture, and the stories that were discarded in order to build a strong, nationalist state—told through the director’s personal experiences. The research questions, as they arise from the cinematographic material itself, are as follows: How is the historical memory of traumatic events of the previous century, such as the exchange of populations according the Treaty of Lausanne, recorded in the cinematographic narrative? What are the historical sources? To what extent did the origin, ethnicity, and geographical location of the narrators as participants influence the preservation of historical memory and the historical research? What are the criteria of the approach of the creator, and what are the criteria of the participants? Methodologically, we apply historic and socio-semiotic analyses in the field of public and digital history. The results: The types of historical sources found in filmic public discourse include the oral narration of testimonies, of experiences and of memories, as well as the director’s historical research in state archives, the material cultural objects, and the director’s digital research. Thus, historic thematic categories occur, such as the specific persons and actions in Turkey/Greece, actions on-site and in online research, and the types of historical sources, such as oral testimonies, research in archives, and objects of material culture. Sub-themes such as childhood, localities and kinship also emerge. These cinematic recordings of biographical oral narratives as historical and sociological material help us understand the political ideologies of the specific period, between the years 1919 and 1923. The multimodal film material is analyzed to provide testimonies of oral and digital history; it is utilized to approach the historical reality of “otherness”, seeking dialogue in cross-border history in order to identify differences, but above all the historic and cultural similarities against sterile stereotypes. The historic era and the historic geography of the Greek and Turkish national histories concern us for research and teaching purposes a hundred years after the Treaty of Lausanne which set the official borders of the countries. Full article

This study investigates the kinetics of interleukine-6 (IL-6) and interleukine-10 (IL-10) levels in dengue virus (DENV) infections during the febrile stage. Viremic patients were categorized into two phases based on anti-DENV IgM presence. Among 259 patients, 71% were in Phase I and 29% in Phase II. Secondary infections, accounting for 38.2% of cases, exhibited earlier elevations of IL-6 and IL-10 than primary infections, suggesting that pre-existing immune memory primes faster cytokine release. Thrombocytopenia and elevated aspartate transaminase (AST) levels were associated with Phase II, secondary infections, and hospitalization. Elevated IL-6 and IL-10 levels correlated with low platelet counts, linking them to clinical manifestations. The key finding is that IL-6 and IL-10 levels rise earlier in secondary infections compared to primary infections, whereas elevated cytokine levels typically occur later in the febrile phase. This study highlights the importance of cytokine dynamics in DENV infections, particularly during the early stages. The observation of cytokine concentration changes, especially in viremic samples, provides insights into the progression of dengue disease. Further research with broader cytokine panels is warranted to validate and expand these findings. Full article

Cholesterol biosynthesis inhibitors (statins) protect hypercholesterolemic patients against developing active tuberculosis, suggesting that these drugs could help the host to control the pathogen at the initial stages of the disease. This work studies the effect of fluvastatin on the early response of healthy peripheral blood mononuclear cells (PBMCs) to inactivated Mycobacterium tuberculosis (Mtb) H37Ra. We found that in fluvastatin-treated PBMCs, most monocytes/macrophages became foamy cells that overproduced NLRP3 inflammasome components in the absence of immune stimulation, evidencing important cholesterol metabolism/immunity connections. When both fluvastatin-treated and untreated PBMCs were exposed to Mtb H37Ra, a small subset of macrophages captured large amounts of bacilli and died, concentrating the bacteria in necrotic areas. In fluvastatin-untreated cultures, most of the remaining macrophages became epithelioid cells that isolated these areas of cell death in granulomatous structures that barely produced IFNγ. By contrast, in fluvastatin-treated cultures, foamy macrophages surrounded the accumulated bacteria, degraded them, markedly activated caspase-1 and elicited a potent IFNγ/cytotoxic response. In rabbits immunized with the same bacteria, fluvastatin increased the tuberculin test response. We conclude that statins may enhance macrophage efficacy to control Mtb, with the help of adaptive immunity, offering a promising tool in the design of alternative therapies to fight tuberculosis. Full article

The persistence and potential toxicity of emergent pollutants pose significant threats to biodiversity and human health, emphasizing the need for sensors capable of detecting these pollutants at extremely low concentrations before treatment. This study focuses on the development of glassy carbon electrodes (GCEs) modified by films of poly-tris(4-(4-(carbazol-9-yl)phenyl)silanol (PTPTCzSiOH), poly-4,4′-Di(carbazol-9-yl)-1,1′-biphenyl (PCBP), and poly-1,3,5-tri(carbazol-9-yl)benzene (PTCB) for the detection of metronidazole (MNZ) in aqueous media. The films were characterized using electrochemical, microscopy, and spectroscopy techniques, including scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Monomers were electropolymerized through cyclic voltammetry and chronoamperometry techniques. Computational methods at the B3LYP/def2-TZVP level were employed to investigate the structural and electrochemical properties of the monomers. The electrochemical detection of MNZ utilized the linear sweep voltammetry technique. Surface characterization through SEM and XPS confirmed the proper electrodeposition of polymer films. Notably, MPN-GCEs exhibited higher detection signals compared to bare GCEs up to 3.6 times in the case of PTPTCzSiOH-GCEs. This theoretical study provides insights into the structural, chemical, and electronic properties of the polymers. The findings suggest that polymer-modified GCEs hold promise as candidates for the development of electrochemical sensors. Full article

Numerous plastic products are used in agriculture, including containers, packaging, tunnels, drip irrigation tubing, and mulches. Large amounts of plastics are used as mulches on the soil surface for vegetable and fruit production (tomato, cucumber, watermelon, strawberry, and vine) to reduce weed competition, increase water and fertilizer use efficiency, and enhance crop yield. Portugal uses around 4500 t/year of polyethylene to cover approximately 23,000 ha of agricultural land, and only a small amount is recovered for recycling or secondary uses because of issues of contamination with the soil, vegetation, pesticides, and fertilizers. Cleaning and decontaminating polyethylene mulch are costly, and commercial technology is often not accessible or economical. Most plastic mulch is composed of polyethylene that degrades slowly and produces a large quantity of residues in the soil, with a negative impact on the environment. In the present study, the effects of long-term cultivation of blueberry using green 100% high-density polyethylene mulch in the south Portugal were evaluated for soil chemical and biological changes. High-density green plastic mulch did not contaminate the topsoil with di(2-ethylhexyl) phthalate, and heavy metals, buttotal nitrogen, organic carbon concentrations, electric conductivity, and microbial activity were significantly reduced in the planting row compared with the bare soil without mulching. Furthermore, the presence of plastic mulch did not negatively affect the presence of nematodes, and the number of Rhabditida (bacterial feeders) increased in the planting and covered row. Full article

This article delves into the history of one of the most infamous internment facilities in Korea’s recent past—Hyungje Bokjiwon (형제복지원), or Brothers Home. The article outlines the history of Brothers Home, its biopolitical production of ‘vanished lives’, and what enabled it to come into existence—arguing that this is an essential context for understanding the history of international adoption from Korea. Located in Busan, South Korea, Brothers Home began as an orphanage in the early 1960s but developed into a ‘social welfare institution’ in the early 1970s. The events that transpired from the early 1970s until the facility shut down in the late 1980s—a period which aligns with the height of international adoption from Korea—have led to some referring to this place as Korea’s ‘concentration camp’. Inmates died in the hundreds, predominantly due to malnutrition and illness, while many suffered brutal deaths through physical abuse and torture. Some of the children from Brothers Home were relocated to Western nations for adoption. The history of Brothers Home embodies the biopolitical process of bodies and lives simultaneously enveloped in and, at the same time, kept outside socio-legal frameworks to invalidate those lives or render them insignificant or invisible; to erase them from any meaningful, socio-legal context and thereby reducing those lives to bare life. The article will focus on three main areas: the history of Brothers Home, the biopolitical production of vanished lives, and how the latter resonates with specific instances depicted in testimonies written by people returning to Korea to uncover details about their adoption circumstances, that is, moments encapsulating this ‘production of vanished lives’. The central concern here is less to draw a direct line between international adoption and the events at Brothers Home, but rather to outline a crucial biopolitical context—epitomized in the history of Brothers Home—that precedes the adoption process and thus constitutes its condition of possibility. By juxtaposing this biopolitical context with autobiographical testimonies of people searching for information about the circumstances of their adoption, the article seeks to understand what it means to bear witness to the existence of a life whose desubjectivization—or disappearance—at the same time constitutes the witnessing subject’s condition of possibility. Full article

This paper is meant as a contribution to the research project on variation and optionality in the determiner system in Italo-Romance, with novel data from the Sicilian dialect of Delia. The study is based on fieldwork interviews and the construction of a small corpus of 850 observations by 24 native speakers of Deliano (mean age: 36.37; age range: 19–72). The participants were asked to (i) describe in Deliano a 3 min videotape of an Italian speaking woman during her shopping session at a supermarket and (ii) talk about their own shopping routines in Deliano. These activities were designed mainly to detect the following strategies to express indefiniteness: (i) ART, i.e., a definite article with an indefinite interpretation; (ii) ZERO, a zero determiner for bare nouns; (iii) DI+ART, the so-called “partitive article”; (iv) pseudo-partitives such as ‘a bit of’; (v) the grammaticalised cardinal ‘two’; and (vi) the grammaticalised cardinal ‘four’. The data confirm (i) the preference for ZERO in negative episodic sentences in the past; (ii) the general lack of bare DI and DI+ART, and of certo ‘certain’ used as an indefinite; (iii) the use of different specialised forms of pseudo-partitive ‘a bit of’ in older speakers of Deliano; (iv) the neutralisation of this pseudo-partitive specialisation and the consequent emergence of some true optionality in younger speakers. Full article

Although wildfires are a common disturbance factor to the environment, some of them can cause significant environmental and socioeconomic losses, affecting ecosystems and people worldwide. The wildfire identification and assessment of their effects on damaged forest areas is of great importance for provision of effective actions on their management and preservation. Forest regrowth after a fire is a continuously evolving and dynamic process, and the accuracy assessment of different remote sensing indices for its evaluation is a complicated task. The implementation of this task cannot rely on the standard procedures. Therefore, we suggested a method involving delineation of dynamic boundaries between conditional categories within burnt forest areas by application of spectral reflectance characteristics (SRC). This study compared the performance of firmly established for fire monitoring differenced vegetation indices—Normalized Difference Vegetation Index (dNDVI) and Normalized Burn Ratio (dNBR) and tested the capabilities of tasseled cap-derived differenced Disturbance Index (dDI) for post-fire monitoring purposes in different forest environments (Boreal Mountain Forest (BMF), Mediterranean Mountain Forest (MMF), Mediterranean Hill Forest (MHF)). The accuracy assessment of the tree indices was performed using Very High Resolution (VHR) aerial and satellite data. The results show that dDI has an optimal performance in monitoring post-fire disturbances in more difficult-to-be-differentiated classes, whereas, for post-fire regrowth, the more appropriate is dNDVI. In the first case, dDI has an overall accuracy of 50%, whereas the accuracy of dNBR and dNDVI is barely 35% and 36%. Moreover, dDI shows better performance in 16 accuracy metrics (from 17). In the second case, dNDVI has an overall accuracy of 59%, whereas those of dNBR and dDI are 55% and 52%, and the accuracy metrics in which dNDVI shows better performance than the other two indices are 11 (from 13). Generally, the studied indices showed higher accuracy in assessment of post-fire disturbance rather than of the post-fire forest regrowth, implicitly at test areas—BMF and MMF, and contrary opposite result in the accuracy at MHF. This indicates the relation of the indices’ accuracy to the heterogeneity of the environment. Full article

This paper proposes to improve the information provided by biological indicators from sedimentary archives by integrating biomolecular techniques and botanical skills. This study represents a first proposal for combining pollen and biomolecular markers to detect land use and improve knowledge of past environmental change drivers. The specific aim of the research is to verify the relationship between miliacin (a pentacyclic triterpene methyl ether, usually interpreted as a broomcorn millet biomarker) and Panicum pollen in three near-site stratigraphic sequences of the Terramara S. Rosa di Poviglio (Po Plain, N Italy). The three cores span the last ~15,000 years and potentially record the beginning of Panicum miliaceum cultivation attested in the area since at least the Bronze Age within the Terramare culture. Despite the fact that Panicum pollen grains were rare in the spectra and miliacin was barely detectable in most of the 31 samples selected for biomolecular analyses, their combined evidence testifies to the local presence of the plant. Panicum pollen and sedimentary miliacin suggest the adoption of millet crops during the Recent Bronze Age by the Terramare culture, when climatic instability led to the diversification of cereal crops and the shift to drought-tolerant varieties. Full article

Electrochemical impedance spectroscopy (EIS) is a sensitive analytical method for surface and bulk properties. Classical EIS and derived electrochemical capacitance spectroscopy (ECS) with a redox couple are label-free approaches for biosensor development, but doubts arise regarding interpretability when a redox couple is employed (redox EIS) due to interactions between electroactive probes and interfacial charges or forced potential. Here, we demonstrated redoxless ECS for directly determining surfactant adsorption on screen-printed carbon electrodes (SPCEs), validated through a simulation of equivalent circuits and the electrochemistry of electronic dummy cells. Redoxless ECS provides excellent capacitance plot loci for quantifying the interfacial permittivity of di-electric layers on electrode surfaces. Redoxless ECS was compared with redox EIS/ECS, revealing a favorable discrimination of interfacial capacitances under both low and high SDS coverage on SPCEs and demonstrating potential for probeless (reagentless) sensing. Furthermore, the proposed method was applied in an electrolyte without a redox couple and bare electrodes, obtaining a high performance for the adsorption of surfactants Tween-20, Triton-X100, sodium dodecyl sulfate, and tetrapropylammonium bromide. This approach offers a simple and straightforward means for a semi-quantitative evaluation of small molecule interactions with electrode surfaces. Our proposed approach may serve as a starting point for future probeless (reagentless) and label-free biosensors based on electrochemistry, eliminating disturbance with surface charge properties and minimizing forced potential bias by avoiding redox couples. An unambiguous and quantitative determination of physicochemical properties of biochemically recognizable layers will be relevant for biosensor development. Full article

We studied the ecological and functional aspects (such as role in sediment characteristics and plant–animal interactions) of a Ruppia cirrhosa (Petagna) Grande meadow during its vegetative season in the choked Valle Campo lagoon, a sub-basin of the wider Valli di Comacchio, on the Northern Adriatic coast. Sampling campaigns were carried out with a roughly fortnightly frequency in 2017 at two sites, one with the Ruppia meadow and one with bare sediment. Sediment parameters analyzed were microphytobenthic chlorophyll-a, protein, carbohydrate, and lipid content, and total organic matter. The macrobenthos was identified at the lowest possible taxonomic level. Chlorophyll a, as a surrogate of microphytobenthos, showed differences between the two sites, probably mainly related to light intensity; thus, it is expected that the absence of seagrass canopy results in the higher production of microphytobenthos. At both sites, proteins were the dominant class of labile compounds, suggesting that detrital organic matter present at both study sites is of high nutritional quality. The high protein/carbohydrate ratio also suggests the presence of non-aged organic matter. We recorded a total of 18 macroinvertebrate taxa. The Ruppia meadow showed a positive influence on macrofauna abundance, diversity, species richness, and composition of trophic groups. Only the infaunal taxa Capitella capitata and Chironomus salinarius exhibited higher abundance at the bare site. The ecological quality status measured by the M-AMBI index was unsatisfactory everywhere. However, the presence of the Ruppia meadow resulted in index values being consistently higher. The role of this minor seagrass has been proved to be of great importance, improving the nutritional quality of the organic matter in the sediments and, above all, providing new habitats and new niches for a number of benthic macrofauna species. Full article

Despite the significance of human development for sustainability, the actual effects of craft-design collaboration on craftspeople have scarcely been discussed. Moreover, despite its wide usage, the meaning of empowerment in design discourse is unclear and its discussions are barely linked to mature ones in other disciplines. In addition, disempowerment has been mentioned far less often than empowerment. From the perspective of empowerment, this article examines the elements in the processes of craft-design collaborations that can exert positive or negative influence on craftspeople, and analyzes both the empowering and disempowering effects on them as co-design outcomes. This research builds on two empirical cases based on Tiao Hua, a cross-stitching handwork. We identify five stages of co-design processes for empowerment analysis. The data was mainly collected from the designers (D1–D16) and craftswomen (C1–C8) through observations, interviews, and reflective sessions. We sorted and codified the qualitative data as sticky note statements. Higher-level themes and sub-themes emerged from the codified statements through affinity analysis. Finally, we presented an analytical framework of craftspeople (dis)empowerment process and outcome. The (dis)empowering process covers four dimensions: organization, instrumentation, participation, and interaction, while the outcome involves emotional, cognitive, behavioral, and relational components. We contend craftspeople (dis)empowerment should be discussed dialectically in four aspects. Full article

This article proposes a three-dimensional heterogenous-integrated (3DHI) switchable bandpass filter bank with two independent wideband filter channels that cover 26–40 GHz and 32.5–40 GHz, respectively. An accurate wafer-level process with a high hollowed ratio of the applied 8-inch high-resistivity-silicon (HR-Si) interposer wafers is presented to form both compact filter channels. Above the interdigital filter patterns fabricated on the bottom interposer wafer, deep cavities are etched in the cap interposer wafer to improve the quality factor of the filter bank. Besides the cavities, the cap interposer wafer is 35% hollow inside, which two bare dies of GaAs single-pole double-throw (SPDT) switches and two thin film resistors are attached to the bottom interposer after the wafer-to-wafer (W2W) bonding. To ensure good out-of-band performance, a 3D EM co-simulation of the switch layout at the chip level and filter patterns at the package level is applied. Measurement results show that the switchable filter bank achieves a high isolation of 50 dB and a competitive shape factor (BW_30dB/BW_3dB) of about 1.3. In addition, the size of the switchable filter bank is only 7.0 mm × 3.5 mm × 0.6 mm, and the weight is only 0.1 g. Full article

In recent years, new solutions have been studied in order to intervene on existing buildings made of load-bearing masonry or reinforced concrete, both from the seismic point of view and the energy one. In recent years, novel modern techniques using lightweight steel profiles made of steel or aluminium alloys, suitably coupled with heat-insulating panels, have been proposed for requalification of existing building stock. In this paper, the Resisto 5.9 system designed by the Progetto Sisma S.r.l. company was studied and applied as a retrofit system of an existing masonry building. First, this new system for seismic energy requalification of the build-up was presented, describing the basic components and the mounting phases. Subsequently, it has applied to a case study building made of full-brick masonry located in the municipality of Casalecchio di Reno, on the outskirts of Bologna in Northern Italy. Finally, the used coating system was designed for the examined building together with other seismic interventions applied to horizontal structures and foundations. The seismic benefits deriving from using the proposed envelope system and other seismic interventions were proved from the seismic viewpoint by linear dynamic and non-linear static analyses using the TreMuri analysis software. From modal analysis it was seen that the dynamic behaviour of the building with Resisto 5.9 is improved, with an increase of the participating mass (68% instead of 49% of the bare building) of the second mode in the longitudinal direction. Moreover, from pushover analysis it was noticed that the seismic safety factor has passed from 0.51 to 1.05 in the X-direction and from 0.78 to 1.27 in the Y-direction. In conclusion, it was demonstrated that Resisto 5.9, together with all the other planned interventions, is able to accomplish the seismic retrofitting of the studied building. Full article