bluuebunny/crossref_metadata_2025 huggingface dataset:
Opinion: The importance of historical and paleoclimate aerosol radiative effects
Authors: Mahowald Natalie M. , Li Longlei , Albani Samuel , Hamilton Douglas S. , Kok Jasper F.
Published: January 2024

Abstract. Estimating past aerosol radiative effects and their uncertainties is an important topic in climate science. Aerosol radiative effects propagate into large uncertainties in estimates of how present and future climate evolves with changing greenhouse gas emissions. A deeper understanding of how aerosols affected the atmospheric energy budget under past climates is hindered in part by a lack of relevant paleo-observations and in part because less attention has been paid to the problem. Because of the lack of information we do not seek here to determine the change in the radiative forcing due to aerosol changes but rather to estimate the uncertainties in those changes. Here we argue that current uncertainties from emission uncertainties (90 % confidence interval range spanning 2.8 W m−2) are just as large as model spread uncertainties (2.8 W m−2) in calculating preindustrial to present-day aerosol radiative effects. There are no estimates of radiative forcing for important aerosols such as wildfire and dust aerosols in most paleoclimate time periods. However, qualitative analysis of paleoclimate proxies suggests that changes in aerosols between different past climates are similar in magnitude to changes in aerosols between the preindustrial and present day; plus, there is the added uncertainty from the variability in aerosols and fires in the preindustrial. From the limited literature we crudely estimate a paleoclimate aerosol uncertainty for the Last Glacial Maximum relative to preindustrial of 4.8 W m−2, and we estimate the uncertainty in the aerosol feedback in the natural Earth system over the paleoclimate (Last Glacial Maximum to preindustrial) to be about 3.2 W m−2 K−1. In order to more accurately assess the uncertainty in historical aerosol radiative effects, we propose a new model intercomparison project, which would include multiple plausible emission scenarios tested across a range of state-of-the-art climate models over the historical period. These emission scenarios would then be compared to the available independent aerosol observations to constrain which are most probable. In addition, future efforts should work to characterize and constrain paleo-aerosol forcings and uncertainties. Careful propagation of aerosol uncertainties in the literature is required to ensure an accurate quantification of uncertainties in projections of future climate changes.
Mass spectrometric analysis of unprecedented high levels of carbonaceous aerosol particles long-range transported from wildfires in the Siberian Arctic
Authors: Schneider Eric , Czech Hendryk , Popovicheva Olga , Chichaeva Marina , Kobelev Vasily , Kasimov Nikolay , Minkina Tatiana , Rüger Christopher Paul , Zimmermann Ralf
Published: January 2024

Abstract. Wildfires in Siberia generate large amounts of aerosols, which may be transported over long distances and pose a threat to the sensitive ecosystem of the Arctic. Particulate matter (PM) of aged wildfire plumes originating from Yakutia in August 2021 was collected in Nadym and on Bely Island (both in northwestern Siberia). An advanced analysis of the chemical composition of aerosol particles was conducted through a multi-wavelength thermal–optical carbon analyzer (TOCA) coupled to resonance-enhanced multiphoton ionization time-of-flight mass spectrometry (REMPI-TOFMS) as well as through ultra-high-resolution Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS). In Nadym, concentrations of organic carbon (OC) and elemental carbon (EC) peaked at 100 and 40 µg m−3, respectively, associated with Angström absorption exponents for 405 and 808 nm (AAE405/808) between 1.5 and 3.3. The weekly average on Bely Island peaked at 8.9 µg m−3 of OC and 0.3 µg m−3 of EC and AAE405/808 close to unity. In particular, ambient aerosol in Nadym had a distinct biomass burning profile with pyrolysis products from carbohydrates, such as cellulose and hemicellulose, as well as lignin and resinoic acids. However, temporarily higher concentrations of five- and six-ring polycyclic aromatic hydrocarbons (PAHs), different from the PAH signature of biomass burning, suggest a contribution of regional gas flaring. FT-ICR MS with electrospray ionization (ESI) revealed a complex mixture of highly functionalized compounds, containing up to 20 oxygen atoms, as well as nitrogen- and sulfur-containing moieties. Concentrations of biomass burning markers on Bely Island were substantially lower than in Nadym, flanked by the appearance of unique compounds with higher oxygen content, higher molecular weight, and lower aromaticity. Back-trajectory analysis and satellite-derived aerosol optical depth suggested long-range transport of aerosol from the center of a Yakutian wildfire plume to Nadym and from the plume periphery to Bely Island. Owing to lower aerosol concentrations in the plume periphery than in its center, it is demonstrated how dilution affects the chemical plume composition during atmospheric aging.
Research of low-cost air quality monitoring models with different machine learning algorithms
Authors: Wang Gang , Yu Chunlai , Guo Kai , Guo Haisong , Wang Yibo
Published: January 2024

Abstract. To improve the performance of the calibration model for the air quality monitoring, a low-cost multi-parameter air quality monitoring system (LCS) based on different machine learning algorithms is proposed. The LCS can measure particulate matter (PM2.5 and PM10) and gas pollutants (SO2, NO2, CO and O3) simultaneously. The multi-input multi-output (MIMO) prediction model is developed based on the original signals of the sensors, ambient temperature (T) and relative humidity (RH), and the measurements of the reference instrumentations. The performance of the different algorithms (RF, MLR, KNN, BP, GA–BP) with parameters such as determination coefficient R2, root mean square error (RMSE), and mean absolute error (MAE) are compared and discussed. Using these methods, the R2 of the algorithms (RF, MLR, KNN, BP, GA–BP) for the PM is in the range 0.68–0.99; the RMSE values of PM2.5 and PM10 are within 2.36–18.68 and 4.55–45.05 µg m−3, respectively; the MAE values of PM2.5 and PM10 are within 1.44–12.80 and 3.21–23.20 µg m−3, respectively. The R2 of the algorithms (RF, MLR, KNN, BP, GA–BP) for the gas pollutants (O3, CO and NO2) is within 0.70–0.99; the RMSE values for these pollutants are 4.05–17.79 µg m−3, 0.02–0.18 mg m−3, 2.88–14.54 µg m−3, respectively; the MAE values for these pollutants are 2.76–13.46 µg m−3, 0.02–0.19 mg m−3, 1.84–11.08 µg m−3, respectively. The R2 of the algorithms (RF, KNN, BP, GA–BP, except for MLR) for SO2 is within 0.27–0.97, the RMSE value is in the range 0.64–5.37 µg m−3, and the MAE value is in the range 0.39–4.24 µg m−3. These measurements are consistent with the national environmental protection standard requirement of China, and the LCS based on the machine learning algorithms can be used to predict the concentrations of PM and gas pollution.
Airborne observation with a low-cost hyperspectral instrument: retrieval of NO2 vertical column densities (VCDs) and the satellite sub-grid variability over industrial point sources
Authors: Park Jong-Uk , Kim Hyun-Jae , Park Jin-Soo , Choi Jinsoo , Park Sang Seo , Bae Kangho , Lee Jong-Jae , Song Chang-Keun , Park Soojin , Shim Kyuseok , Cho Yeonsoo , Kim Sang-Woo
Published: January 2024

Abstract. High-spatial-resolution NO2 vertical column densities (VCDs) were retrieved from airborne observations using the low-cost hyperspectral imaging sensor (HIS) at three industrial areas (i.e., Chungnam, Jecheon, and Pohang) in South Korea, where point sources (i.e., power plant, petrochemical complex, steel yard, and cement kiln) with significant NO2 emissions are located. An innovative and versatile approach for NO2 VCD retrieval, hereafter referred to as the modified wavelength pair (MWP) method, was developed to overcome the excessively variable radiometric and spectral characteristics of the HIS attributed to the absence of temperature control during the flight. The newly developed MWP method was designed to be insensitive to broadband spectral features, including the spectral dependency of surface and aerosol reflectivity, and can be applied to observations with relatively low spectral resolutions. Moreover, the MWP method can be implemented without requiring precise radiometric calibration of the instrument (i.e., HIS) by utilizing clean-pixel data for non-uniformity corrections and is also less sensitive to the optical properties of the instrument and offers computational cost competitiveness. In the experimental flights using the HIS, NO2 plumes emitted from steel yards were particularly conspicuous among the various NO2 point sources, with peak NO2 VCDs of 2.0 DU (Dobson unit) at Chungnam and 1.8 DU at Pohang. Typical NO2 VCD uncertainties ranged between 0.025–0.075 DU over the land surface and 0.10–0.15 DU over the ocean surface, and the discrepancy can be attributable to the lower signal-to-noise ratio over the ocean and higher sensitivity of the MWP method to surface reflectance uncertainties under low-albedo conditions. The NO2 VCDs retrieved from the HIS with the MWP method showed a good correlation with the collocated Tropospheric Monitoring Instrument (TROPOMI) data (r=0.73, mean absolute error equals 0.106 DU). However, the temporal disparities between the HIS frames and the TROPOMI overpass, their spatial mismatch, and their different observation geometries could limit the correlation. The comparison of TROPOMI and HIS NO2 VCDs further demonstrated that the satellite sub-grid variability could be intensified near the point sources, with more than a 3-fold increase in HIS NO2 VCD variability (e.g., difference between 25th and 75th quantiles) over the TROPOMI footprints with NO2 VCD values exceeding 0.8 DU compared to footprints with NO2 VCD values below 0.6 DU.
Measurement uncertainties of scanning microwave radiometers and their influence on temperature profiling
Authors: Böck Tobias , Pospichal Bernhard , Löhnert Ulrich
Published: January 2024

Abstract. In order to improve observations of the atmospheric boundary layer (ABL), the European Meteorological Network, EUMETNET, and the Aerosol, Clouds, and Trace Gases Research Infrastructure, ACTRIS, are currently working on building networks of microwave radiometers (MWRs). Elevation-scanning MWRs are well suited to obtain temperature profiles of the atmosphere, especially within the ABL. Understanding and assessing measurement uncertainties of state-of-the-art scanning MWRs is therefore crucial for accurate temperature profiling. In this paper, we discuss measurement uncertainties due to the instrument setup and originating from external sources, namely (1) horizontal inhomogeneities of the atmosphere, (2) pointing errors or a tilt of the instrument, (3) physical obstacles in the line of sight of the instrument, and (4) radio frequency interference (RFI). Horizontal inhomogeneities from observations at the Jülich Observatory for Cloud Evolution (JOYCE) are shown to have a small impact on retrieved temperature profiles (<|0.22K| in the 25th and 75th percentiles below 3000 m). Typical instrument tilts, that could be caused by uncertainties during the instrument setup, also have a very small impact on temperature profiles and are smaller than 0.1 K below 3000 m for up to 1∘ of tilt. Physical obstacles at ambient temperatures and in the line of sight and filling the complete beam of the MWR at the lowest elevation angle of 5.4∘ have to be at least 600 m away from the instrument in order to have an impact of less than 0.1 K on obtained temperature profiles. If the obstacle is 5 K warmer than its surroundings then the obstacle should be at least 2700 m away. Finally, we present an approach on how to detect RFI with an MWR with azimuth and elevation-scanning capabilities. In this study, we detect RFIs in a water vapor channel that does not influence temperature retrievals but would be relevant if the MWR were used to detect horizontal humidity inhomogeneities.
A new power-law model for μ–Λ relationships in convective and stratiform rainfall
Authors: Gatidis Christos , Schleiss Marc , Unal Christine
Published: January 2024

Abstract. In this study, we take a closer look at the important issue of μ–Λ relationships in raindrop size distributions (DSDs) by conducting a systematic analysis of 20 months of data collected by disdrometers in the Netherlands. A new power-law model for representing μ–Λ relationships based on the double normalization framework is proposed and used to derive separate μ–Λ relationships for stratiform and convective rain events. The sensitivity of the obtained relationships to measurement uncertainty is studied by applying two different quality control filters based on the mass-weighted mean drop diameter (Dm) and liquid water content (LWC). Our results show that there are significant differences in μ–Λ relationships between convective and stratiform rainfall types. However, the retrieved relationships appear to be quite robust to measurement noise and there is good agreement with other reference relations for similar climatological conditions.
Global Cropland Expansion Enhances Cropping Potential and Reduce its Inequality among Countries
Authors: Liu Xiaoxuan , Zhu Peng , Liu Shu , Yu Le , Wang Yong , Du Zhenrong , Peng Dailiang , Aksoy Ece , Lu Hui , Gong Peng
Published: January 2024

Abstract. Global cropland expansion has been recognized as a key driver of food security. However, cropland expansion induced alterations in biophysical properties of the Earth's surface and greenhouse gas emissions may potentially impact the Earth's climate system. These changes could, in turn, affect cropland productivity and the potential distribution of croplands, although the underlying mechanisms remain relatively underexplored. In this study, a global climate model was employed to quantify the impact of global cropland expansion on cropping potential, utilizing observed and derived cropland expansion data. Our findings reveal that since 10000 BC, a 28 % increase in cropland expansion has led to a 1.2 % enhancement in global cropping potential, owing to more favorable precipitation and temperature conditions. This suggests that global cropland expansion yields dual benefits to crop production. However, in regions with low growth rates of cropping potential, cropland expansion proves to be an inefficient method for augmenting local crop potential yield. As croplands continue to expand worldwide, the capacity to support populations in different regions is altered, thereby reducing cropping potential inequality among nations.
Estimating ocean heat content from the ocean thermal expansion parameters using satellite data
Authors: Kondeti Vijay Prakash , Palanisamy Shanmugam
Published: January 2024

Abstract. Ocean heat content (OHC) is a depth-integrated physical oceanographic variable used to precisely measure ocean warming. Because of the limitations associated with in-situ CTD data and Ocean Reanalysis system products, satellite-based approaches have gained importance in estimating the daily to decadal variability of OHC over the vast oceanic region. Efforts to minimize the biases in satellite-based OHC estimates are needed to realize the actual response of the ocean to the brunt of climate change. In the current study, an attempt has been made to better implement the satellite-based ocean thermal expansion method to estimate OHC at 17 depth extents ranging from the surface to 700 m. To achieve this objective, an artificial neural network (ANN) model was developed to derive thermosteric sea level (TSL) from a given dataset of sea surface temperature, sea surface salinity, geographical coordinates, and climatological TSL. The model-derived TSL data were used to estimate OHC changes based on the thermal expansion efficiency of heat. Statistical analysis showed high correlation coefficients and low errors in satellite-derived TSL / OHC at 700 m water depth (N 388469, R 0.9926 / 0.9922, RMSE 1.16 m / 1.56 GJ m-2, MBE -0.1917 m / -0.2400 GJ m-2, MBPE -0.4560 % / -0.0290 %, MAE 0.763 m / 1.029 GJ m-2, and MAPE 2.34 % / 0.13 %) and nearly similar results at the remaining depth extents. These results suggest that the proposed ANN models are capable of accurately estimating OHC changes on real-time data and three-dimensional distribution patterns of depth-integrated OHC trends in the global ocean. In addition, the first-ever attempt to estimate the ocean thermal expansion component (i.e., TSL) from satellite data was successful and the model-derived TSL can be used to obtain high-end sea-level rise products in the global ocean.
SHIFT: A DEM-Based Spatial Heterogeneity Improved Mapping of Global Geomorphic Floodplains
Authors: Zheng Kaihao , Lin Peirong , Yin Ziyun
Published: January 2024

Abstract. Floodplain is a vital part of the global riverine system. Among all the global floodplain delineation strategies empowered by remote sensing, DEM-based delineation is considered computationally efficient with relatively low uncertainties, but the parsimonious model struggles with incorporating spatial heterogeneity into the floodplain map. In this study, we propose a globally applicable thresholding scheme for DEM-based floodplain delineation to improve the representation of spatial heterogeneity. Specifically, we develop a stepwise approach to estimate the Floodplain Hydraulic Geometry (FHG) scaling parameters for 269 river basins worldwide to best respect the scaling law while approximating the spatial extent of two publicly available global flood maps derived from hydrodynamic modeling. Based on the spatially-varying FHG parameters, a ~90-m resolution global floodplain map named Spatial Heterogeneity Improved Floodplain by Terrain analysis (SHIFT) is delineated, which takes the hydrologically corrected MERIT-Hydro dataset as the DEM inputs and the Height Above Nearest Drainage (HAND) as the terrain attribute. Our results demonstrate that SHIFT validates well with reference maps with the overall accuracy exceeding 0.85. At the same time, it shows superior consistencies with several other datasets sourced from independent hydrodynamic modeling and DEM-based approaches. SHIFT effectively captures the global patterns of the geomorphic floodplains, with better regional details than existing data. The estimated FHG exponent exhibits a significant positive relation with the basins’ climatic aridity conditions, particularly for 34 world’s major river basins, suggesting the ability of the scaling exponents in capturing more spatial heterogeneity. SHIFT estimates global floodplain area to be 8.2 million km2, representing 5.5 % of the world's total land area, and we anticipate SHIFT available at https://zenodo.org/records/10440609 (Zheng et al., 2023) to be used to support a range of applications requiring boundary delineations of the global geomorphic floodplains.
Scalable Feature Extraction and Tracking (SCAFET): a general framework for feature extraction from large climate data sets
Authors: Nellikkattil Arjun Babu , Lemmon Danielle , O'Brien Travis Allen , Lee June-Yi , Chu Jung-Eun
Published: January 2024

Abstract. This study describes a generalized computational mathematical framework, Scalable Feature Extraction and Tracking (SCAFET), that extracts and tracks features from large climate data sets. SCAFET utilizes novel shape-based metrics that can identify and compare features from different mean states, data sets, and between distinct regions. Features of interest such as atmospheric rivers, tropical and extratropical cyclones, and jet streams are extracted by segmenting the data based on a scale-independent bounded variable called the shape index (SI). The SI gives a quantitative measurement of the local geometric shape of the field with respect to its surroundings. Compared to other widely used frameworks in feature detection, SCAFET does not use a posteriori assumptions about the climate model or mean state to extract features of interest and levelize the comparison between different models and scenarios. To demonstrate the capabilities of the method, we illustrate the detection of atmospheric rivers, tropical and extratropical cyclones, sea surface temperature fronts, and jet streams. Cyclones and atmospheric rivers are extracted to show how the algorithm identifies and tracks both the nodes and areas from climate data sets. The extraction of sea surface temperature fronts exemplifies how SCAFET effectively handles curvilinear grids. Last, jet streams are extracted to demonstrate how the algorithm can also detect three-dimensional features. As a generalized framework, SCAFET can be implemented to extract and track many weather and climate features across scales, grids, and dimensions.
Sweep interpolation: a cost-effective semi-Lagrangian scheme in the Global Environmental Multiscale model
Authors: Mortezazadeh Mohammad , Cossette Jean-François , Dastoor Ashu , de Grandpré Jean , Ivanova Irena , Qaddouri Abdessamad
Published: January 2024

Abstract. The interpolation process is the most computationally expensive step of the semi-Lagrangian (SL) approach for solving advection and is commonly used in numerical weather prediction (NWP) models. It has a significant impact on the accuracy of the solution and can potentially be the most expensive part of model integration. The sweep algorithm, which was first described by Mortezazadeh and Wang (2017), performs SL interpolation with the same computational cost as a third-order polynomial scheme but at the accuracy of the fourth order. This improvement is achieved by using two third-order backward and forward polynomial interpolation schemes in two consecutive time steps. In this paper, we present a new application of the sweep algorithm within the context of global forecasts produced with Environment Climate Change Canada's Global Environmental Multiscale (GEM) model. Results show that the SL scheme with sweep interpolation is computationally more efficient compared to a conventional SL scheme with fourth-order polynomial interpolation, especially when a very large number of passive tracers are advected. An additional advantage of this new approach is that its implementation in a chemical and weather forecast model requires minimum modifications of the interpolation weighting coefficients. An analysis of the computational performance for a set of theoretical benchmarks as well as a global ozone forecast experiment show that up to 15 % reduction in total wall clock time is achieved. Forecasting experiments using the global version of the GEM model and the new interpolation show that the sweep interpolation can perform very well in predicting ozone distribution, especially in the tropopause region, where transport processes play a significant role.
Impact of increased resolution on Arctic Ocean simulations in Ocean Model Intercomparison Project phase 2 (OMIP-2)
Authors: Wang Qiang , Shu Qi , Bozec Alexandra , Chassignet Eric P. , Fogli Pier Giuseppe , Fox-Kemper Baylor , Hogg Andy McC. , Iovino Doroteaciro , Kiss Andrew E. , Koldunov Nikolay , Le Sommer Julien , Li Yiwen , Lin Pengfei , Liu Hailong , Polyakov Igor , Scholz Patrick , Sidorenko Dmitry , Wang Shizhu , Xu Xiaobiao
Published: January 2024

Abstract. This study evaluates the impact of increasing resolution on Arctic Ocean simulations using five pairs of matched low- and high-resolution models within the OMIP-2 (Ocean Model Intercomparison Project phase 2) framework. The primary objective is to assess whether a higher resolution can mitigate typical biases in low-resolution models and improve the representation of key climate-relevant variables. We reveal that increasing the horizontal resolution contributes to a reduction in biases in mean temperature and salinity and improves the simulation of the Atlantic water layer and its decadal warming events. A higher resolution also leads to better agreement with observed surface mixed-layer depth, cold halocline base depth and Arctic gateway transports in the Fram and Davis straits. However, the simulation of the mean state and temporal changes in Arctic freshwater content does not show improvement with increased resolution. Not all models achieve improvements for all analyzed ocean variables when spatial resolution is increased so it is crucial to recognize that model numerics and parameterizations also play an important role in faithful simulations. Overall, a higher resolution shows promise in improving the simulation of key Arctic Ocean features and processes, but efforts in model development are required to achieve more accurate representations across all climate-relevant variables.
Russian-Ukraine Conflict and the Purpose of NATO: A Rethink
Authors: Mujadid Ghulam , Kiran Saba
Published: January 2024

This article examines and contrasts Russia's and U.S.'s perspectives and actions throughout the conflict and attempts to determine why the conflict in Ukraine escalated into a global power struggle. Due to the abundance of biased and self-serving information about the Ukrainian situation, this article aims to objectively investigate some aspects of the actions and behaviours of the U.S. to expand NATO to Eastern European states; and Russia’s bids to secure it near abroad. These conflicting strategic dynamics made their contributions to the situation. Since the data were gathered through books, journal papers, websites, and periodicals, the study is a desk study. It is qualitative because it draws on various sources to analyze this problem and comprehend the opposing viewpoints. Russia and the U.S. are sponsoring rival militias to strategically dominate the Black Sea Region for their economic gains. To keep one another from achieving hegemonic dominance in the Black Sea region, both governments worked in their self-interest to strengthen their respective positions and undercut those of their rivals. How the Ukraine conflict evolved would have been different had the two great powers not been involved in the ways they did.
Iran-Saudi Arabia Diplomatic Relations and China's Role in Regional Politics
Authors: BILAL MUHAMMAD , Begum Sajida , Farooq Amina
Published: January 2024

This article examines the latest diplomatic developments between Saudi Arabia and Iran and China’s role in regional politics. The study explores the historical context of these nations’ harsh diplomatic relations and the different concerns that have pursued the latest diplomatic warmth. Moreover, it explores China’s enhancing engagement in the Middle East, specifically its growing financial and strategic relations with Saudi Arabia and Iran, and the impression of this on regional political order. This research is the result of an analysis of both primary and secondary sources, involving official data, and academic and media reports. The results suggest that the improvising relations between Saudi Arabia and Iran have the courage to incorporate stability into International Politics, while China’s contribution to regional order can give a new arena for support and development. This article yields with recommendations for relevant stakeholders and political actors in leading stability and peace in the Gulf.
Singular Purpose: Calculating the Degree of Ethno-Religious Over-representation in the US No-Fly List
Authors: Garofalo Matteo
Published: January 2024

In January 2023, a partially redacted version of the controversial US No-Fly List was retrieved during a hacking event and made available to journalists and academics. With access to this unique dataset, it is possible to confirm or deny longstanding critiques of whether the No-Fly List features a discriminatory over-representation of certain ethno-religious groups, namely those of Islamic faith and Middle Eastern heritage. As the partially redacted list does not contain ethnic or religious data, the author of this article categorised each name by ethno-linguistic and religious origin to create a proxy with which to analyse claims of discrimination. The research outlined in this article finds that individuals of broadly Islamic and Middle Eastern heritage are vastly overrepresented on the List relative to their proportion of the US population, as well as overrepresented relative to their propensity to engage in terrorism. Only in the narrow analysis of lethality of terrorist attacks committed by this group does the No-Fly List demonstrate fair representation.
Habitar la disidencia en Madrid: consumo, transgresión e identidad sexual en los años ochenta
Authors: Algaba Pérez Blanca
Published: January 2024

La ciudad de Madrid fue testigo y protagonista de grandes transformaciones sociales, económicas y culturales a raíz de la Transición democrática en España. Este panorama de apertura y oportunidad fue aprovechado por todos aquellos sujetos que trataron de salir de la marginalidad y construir sus propias identidades y lugares dentro de la jungla que es el mundo urbano. Este texto muestra las geografías sexuales que emergen de fuentes hemerográficas de la época como la Guía del Ocio, Madrid gai y La Luna de Madrid, a través de la elaboración de mapas, que revelan en mayor y menor grado la visibilización de locales y prácticas de la disidencia sexogénerica. Además, también se analizan las representaciones de los lugares y las prácticas de la disidencia en estos medios de comunicación, con el objetivo de atender a la construcción de significados en torno a estos sujetos y los conflictos que acompañaron este proceso. En definitiva, este artículo aborda la creación de lugares propios por parte de los sujetos disidentes, la circulación de la información sobre estos enclaves y sus prácticas, y el despliegue de nuevos comportamientos e identidades en la capital en la primera mitad de los años ochenta.
Luz e cor: a estética artificial do cinema queer brasileiro contemporâneo
Authors: Guido Bruna , Prysthon Angela
Published: January 2024

Este artigo objetiva investigar as estéticas do artifício do cinema queer brasileiro contemporâneo por meio de alguns conceitos-chave como o camp, o lindo e a noção de superfície, a fim de compreender como estes se articulam entre si e como estabelecem relações com a luz e a cor enquanto elementos importantes que indicam uma distinção imagética queer. Ao estabelecer uma plataforma crítica contrária à hegemonia cis-heterossexual, o artigo não apenas convida à reavaliação dessas expressões, mas também busca enriquecer o domínio dos estudos queer e da estética dentro do âmbito cinematográfico. A discussão busca aprofundar temáticas relativas à iluminação, elemento intrínseco para a existência do cinema. No entanto, essa exploração transcende o domínio técnico, examinando como a iluminação tem a capacidade de perdurar e criar percepções realistas ligadas à tradição cristã. Assim, o papel da luz no estudo também é investigado sob uma perspectiva moral, destacando sua habilidade de articular valores visuais na narrativa. Ao mesclar as complexidades das estéticas do artifício com uma análise aprofundada da iluminação cinematográfica, este estudo procura aprimorar a compreensão das várias camadas que permeiam o cinema queer brasileiro. Nesse processo, explora-se como este cinema vai além de lugares da representatividade e trabalha em distinções da imagem ao desafiar e modificar noções convencionais da linguagem cinematográfica.
Presentación. Cine queer tras el cambio de siglo
Authors: Martínez-Expósito Alfredo , García-Ramos Francisco-José , Santos Claudiene , Cremona Florencia
Published: January 2024

El dossier que aquí se presenta contiene artículos que abordan prácticas cinematográficas queer en el siglo XXI. Una reflexión inicial sobre la etiqueta “queer” en un período cronológico posterior a lo que en su momento Ruby Rich denominó, con gran éxito en círculos académicos, “New Queer Cinema”, debería partir de la constatación de que este tipo de cine ha conquistado espacio de producción y recepción en geografías extraordinariamente diversas, que desbordan ampliamente las fronteras del mundo anglosajón, o, si se prefiere, occidental, al que en las dos últimas décadas del siglo XX parecía circunscrito.
Análise do perfil de resiliência psicológica de atletas amadores de beach tennis
Authors: Pessoa Da Silva Alexssander , De Assis Lauria André , Costa Teixeira Bruno , Bohnen Guimarães Juliana , Roberto Ventura De Oliveira João , Cristina Fonseca Bicalho Camila
Published: January 2024

O objetivo deste estudo foi identificar o perfil da Resiliência Psicológica (RP) em praticantes amadores de Beach Tennis (BT) em eventos competitivos e estabelecer parâmetros iniciais de RP por categorias do BT. Participaram 51 atletas com idade de 37,4 ± 7,92 anos. As coletas foram feitas via Google Forms® entre os meses de março a maio de 2022 durante as competições realizadas no Estado de Minas Gerais e Rio de Janeiro, sendo aplicada a Escala de Resiliência no Esporte (RS-Sp). O escore total da RS-Sp foi de 10,75 ± 1,57 pontos, sendo classificado como baixa, segundo o parâmetro para atletas brasileiros. Conclui-se que os atletas de BT apresentaram menores índices de RP do que o esperado podendo influenciar em menor capacidade de lidar com processos estressores advindos das situações esportivas.
Development of Mobile Communal Overpasses Applied During Repairing of Urban Communal Networks
Authors:   Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan, Kadyrov A , Ganyukov A ,   Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan, Amanbayev S ,   Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan, Bogdanova A ,   Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan
Published: January 2024

The issues of design and research of the operation of communal overpass structures that are mobile and modular are outlined. The proposed overpasses are mobile bridge structures equipped with their own chassis for their movement. They are designed for vehicles to pass through them and are used to eliminate traffic jams on city roads and during the repair of underground communal networks. The idea of using overpasses is to eliminate traffic congestion, improve the ecological state of cities by developing structures, creating a methodology for calculating and designing mobile and modular overpasses. The term communal overpass includes mobile and modular overpass in its meaning.
Developing the Technology and Bench Testing Methods of Supporting the Rock Massif
Authors:   Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan, Demin V , Каmarov R ,   Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan
Published: January 2024

There have been developed nomograms to determine the speed of driving development workings and the number of tunneling team, taking into account the control of geomechanical processes in side rocks. The feasibility study of the developed technological solutions has been substantiated and the scope of their application has been determined. The practical approbation of the results for the conditions of the Karaganda coal basin mines has been presented. Based on the obtained results, comparative mine tests of imported (the JV Minova-Kazakhstan LLP ) and experimental (domestic) samples of roof bolting were carried out. Testing the anchors at the Saranskaya and Kostenko mines of the CD ArcelorMittal Temirtau JSC showed their efficiency and effectiveness. Implementation of the proposed developments made it possible, together with the specialists of the CD ArcelorMittal Temirtau JSC and the BASF Central Asia LLP, to introduce innovative industrial developments into production
Study of Pavement Anomalies Using GPR of OKO-2 series
Authors:   L.N. Gumilyov Eurasian National University, Astana, Kazakhstan, Iskakov K , Sagindykov K ,   L.N. Gumilyov Eurasian National University, Astana, Kazakhstan, Mukhambetkaliyev K ,   Kazakhstan Center for Modernization and Development of Housing and Communal Services, Astana, Kazakhstan, Kalmenov K ,   RSE on REU «National Center for the Quality of Road Assets», Astana, Kazakhstan, Seitkhanova A ,   RSE on REU «National Center for the Quality of Road Assets», Astana, Kazakhstan
Published: January 2024

This paper reflects the main aspects of the methodology for studying road pavement structures using non-invasive research methods. The technology for diagnosing highways using OKO-2 georadar complexes has been studied. Non-invasive methods are based on the principle of radar with the generation of electromagnetic high-frequency wave pulses through pavement structures. The scientific work was carried out within the framework of grant funding for a scientific and technical project on the topic: AP19680361 - “Development of computing technologies for diagnosing road pavement of highways.” Based on the analysis of radargrams and instrumental examination of highway anomalies using mathematical methods, it is planned to determine numerical algorithms using the theory of ill-posed problems, mathematical apparatus: equations of mathematical physics, optimization methods and the theory of difference schemes. This work is of scientific and practical interest for improving the methodology for georadar inspection of highways
Prevalence, Incidence, Diagnosis and Management of Myocardial Infarction in Saudi Arabia
Authors: Alharbi Samar , Alsubaie Yassr , Al Rashed Shahd , Almutairi Abdullah , Alebiwani Talal , Alanazi Abdullah , Sultan Yasser , Algouzi Belgith , Alghamdi Abdulrahman , Alahmar Sultan , Al Moarfej Abdulelah
Published: January 2024

Cardiovascular disease (CVD) affects a third of the global population, with myocardial infarction (MI) being a severe form primarily caused by coronary artery disease (CAD). Saudi Arabia's urbanization has led to an increase in CAD cases, driven by risk factors like obesity, hypercholesterolemia, diabetes, hypertension, and dyslipidemia. Family history also plays a role, especially in younger myocardial infarction (MI) patients. Diagnostic tools include electrocardiography, cardiac biomarkers, and imaging. Telemedicine aids in remote diagnosis. Recent studies in Saudi Arabia show chest pain as a common MI symptom, with younger patients more likely to have ST-segment elevation MI. Management follows international guidelines, emphasizing early recognition, emergency medical services intervention, and reperfusion therapy. Medications, including antiplatelets and statins, are used, but gender disparities exist. Cardiac rehabilitation programs and public health initiatives contribute to post-MI care. Despite advancements, challenges like door-to-balloon time persist, requiring further improvements in MI care in Saudi Arabia.
Mobile Commerce Application and Services – A Study on Customer Perception
Authors: Narayanan M.
Published: January 2024

The recent years have seen an explosive growth in the mobile phone industry. The concept of anytime and anywhere internet facility with an inexpensive and comparatively smaller computing infrastructure is the driving force towards mobile commerce. With the advancements in the Wireless communication, mobile commerce has become a new paradigm for personal communication without any constraints in location. The present study for customer awareness and facing problems at mobile commerce applications. Consumers have embraced the web based e commerce in their day to day life in such a way that they cannot think of doing their tasks without any electronic channel and this has made businesses to extend their services beyond electronic channel into mobile channel. This study results that Mobile commerce play important role infecting human life. Mobile Commerce’s future seems to be extremely safe. In the previous few years it has been seen that the potential of M-commerce has paved a way to new emerging practices for businesses in today’s world and India is also showing the positive prints of adaptation of M-commerce platform for the same.
Fostering Employee Commitment: The Role of Psychological Contract
Authors: Khanom Zuma Sabreya , Alam Jahangir
Published: January 2024

The purpose of this study is to examine the relationship between psychological contract and employee commitment from the perspective of employees. In this regard, four types of psychological contract have been selected as independent variables and employee commitment as dependent variable. The primary data have been collected from 340 private sectors’ employees in Bangladesh through floating a structured questionnaire designed with five-point Likert measurement scale. Descriptive statistics and bivariate correlation have been applied to know the interplay among independent and dependent variables. The linear regression result and hypothetical analysis reveal that relational and balanced psychological contract have significant relationship with employee commitment. On the contrary, transactional and transitional psychological contracts hypotheses are rejected due to the insignificance. Eventually the findings of the study imply that majority of the employees highly prefer enduring relational employment with loyalty, faith, commitment and job security rather than short term ambiguous employment with high contingent pay and training.
Unveiling College Selection Factors: A Study of Management students in Indian Private B-Schools
Authors: Kumar Sahu Pabitra , Vishal Kumar Rohit
Published: January 2024

This study examines the factors influencing the choices of management students in India when selecting private business schools. A sample of 161 students from the top 100 privatesas per the National Institutional Ranking Framework (NIRF). B-Schools in India were surveyed to explore the key determinants. The findings reveal that placement opportunities, location, and social media posts play a significant role in influencing students' selection of private business schools. The research emphasizes the importance of considering these factors when designing marketing strategies for private business schools in India. Additionally, it raises concerns about the growing impact of social media on the decision-making process. The study provides valuable insights into the decision-making behaviours of management students and offers implications for educational institutions and policymakers. These findings can be utilized by educational institutions to develop effective marketing strategies to attract prospective students and by policymakers to improve the quality of higher education in India. The study highlights the importance of targeting, segmenting, and positioning promotional strategies according to individual needs based on gender, class, and SECs. Overall, this study makes a valuable contribution to the body of knowledge on B-School enrollment and marketing and can be used by stakeholders in the education sector to improve their marketing and enrollment strategies.
Research Methodologies that can be used for surface modifications of non-ferrous alloys in Friction Stir Processing – A Review
Authors: Sandhu Kulbir Singh
Published: January 2024

Friction Stir Processing (FSP) is an innovative solid-state processing technique that holds significant promise for the enhancement of non-ferrous alloys, particularly aluminum and magnesium. Unlike traditional methods involving melting and casting, FSP operates at temperatures below the material's melting point, preserving its inherent properties and mitigating defects associated with liquid-state processing. The technique employs a non-consumable, specially designed tool with a rotating pin and shoulder, which is plunged into the material and traversed along the surface. This action generates intense frictional heat, leading to plastic deformation and subsequent recrystallization. In non-ferrous alloys, FSP results in refined microstructures, improved mechanical properties, and enhanced wear resistance. The process has found widespread applications in aerospace, automotive, and other industries where lightweight and high-performance materials are crucial. Various approaches like numerical modelling, taguchi and analytical modelling can be followed while processing for optimization of processing parameters. The microstructural modifications induced by FSP contribute to grain refinement, reducing porosity and enhancing the overall integrity of the material. Furthermore, FSP enables the incorporation of reinforcing particles, leading to the formation of surface composites with tailored properties.
Đặc điểm lâm sàng rối loạn cương dương ở người bệnh rối loạn trầm cảm tái diễn
Authors: Hoài Vũ Văn , Tuấn Nguyễn Văn
Published: January 2024

Rối loạn cương dương là rối loạn chức năng tình dục ở nam giới có liên quan với rối loạn trầm cảm. Chúng tôi nghiên cứu trên 103 người bệnh được chẩn đoán rối loạn trầm cảm tái diễn theo tiêu chuẩn ICD-10 (1992) điều trị ngoại trú tại Phòng khám chuyên khoa Tâm thần - Bệnh viện Bạch Mai từ tháng 08/2022 đến tháng 08/2023. Kết quả: tuổi trung bình là 39,5 ± 14,99 tuổi, phần lớn đối tượng nghiên cứu < 40 tuổi (59,2%). Có 57,3% người bệnh có rối loạn cương dương, trong đó mức độ vừa chiếm tỉ lệ cao nhất (39,0%), thường diễn biến trên 1 năm (64,4%). Trong số những người bệnh rối loạn cương dương, đa số người bệnh “đôi khi” cương cứng dương vật một phần hoặc hoàn toàn khi bị kích thích tình dục bằng bất kỳ hình thức nào (50,7%), phần lớn người bệnh “đôi khi” có thể cương cứng dương vật đủ để quan hệ tình dục (47,5%), hay thâm nhập vào đối tác khi cố gắng quan hệ tình dục, và cương cứng đạt yêu cầu khi cố gắng quan hệ tình dục (theo quan điểm của người bệnh) (42,4%); và có gần một nửa số người bệnh khó khăn trong duy trì sự cương cứng để hoàn thành quan hệ tình dục ở mức độ “hơi khó” (45,8%).
前瞻教育議題研究
Authors: 吳清山 吳清山
Published: January 2024

本書共分為十章，內容包括邁向2030教育挑戰與行動、人工智慧與教育發展、雙語教育政策、高教公共化、大學校長遴選、高等教育部設立、私立高級中等學校退場與未來發展、教育領導等議題，旨在闡述前瞻性教育領域的相關議題，並以合乎邏輯和系統的方式呈現，為讀者提供思索未來教育發展的基礎，深信本書對讀者理解未來教育發展具有重要參考價值。
Sistemul S-400 „Triumf ”: între așteptări și rezultate
Authors: CHIRIAC Cătălin
Published: January 2024

În timpul Războiului Rece, Uniunea Sovietică a investit masiv în sistemele sale de apărare aeriană, astfel  încât moștenitoarea de drept a acesteia, Rusia, deține acum unele dintre cele mai avansate sisteme de apărare aeriană și antirachetă din lume. Dintre acestea, sistemul de rachete sol-aer S-400 „Triumf ” reprezintă poate cel mai criticat, învăluit în mister și temut sistem din arsenalul Rusiei. Dezvoltat și apoi prezentat drept capabil de a angaja o varietate de amenințări aeriene, sistemul a dobândit reputația, cel puțin la nivel declarativ, de fi în măsură să contracareze ambițiile SUA și ale NATO, de câștigare a unui conflict prin dominarea spațiului aerian.
Vesicovaginal fistula post-vaginal delivery late revelation: A case report
Authors: Hafsi Montacer , Moussi Marwa , Zouagh Asma , Najar Souhir , Dridi Faten , Mourali Mechaal
Published: January 2024

Introduction: This study presents a compelling clinical case involving a 43-year-old woman who encountered a vesicovaginal fistula subsequent to vaginal delivery. The narrative encompasses the occurrence, diagnosis, and subsequent management of this rare postpartum complication.

Case Report: A 43-year-old woman with an unscarred uterus experienced the conventional signs of postpartum recovery but developed hematuria and vaginal urinary leakage on the seventh postpartum day. Clinical assessment confirmed a vesicovaginal fistula due to partial uterine dehiscence. Diagnostic procedures and the subsequent successful surgical intervention are detailed, followed by the postoperative surveillance strategy and a one-month post-surgery evaluation.

Conclusion: This case study demonstrates the successful management of a postpartum vesicovaginal fistula through surgical intervention, resulting in complete closure of the fistula and significant improvement in urinary symptoms. It highlights the importance of timely diagnosis and appropriate surgical intervention in managing such rare complications following vaginal delivery.