bluuebunny/crossref_metadata_2025 huggingface dataset:
Off-grid system using a converter with multiple DC inputs and three-phase, multi-level AC output
Authors: Muc Adam ,   Department of Ship Automation, Gdynia Maritime University. Poland
Published: July 2024

This paper describes the possibility of interfacing a three-phase voltage converter with a configurable DC input and a multi-level AC output with an on-grid system. The described converter uses magnetically coupled reactors. The multilevel output voltage of the converter is characterized by a favorable value of the THD coefficient. With the ability to configure DC inputs, the proposed converter allows easier integration of renewable energy installations, such as PV. A control strategy for the voltage inverter has been developed. Experimental studies of the basic converter design are presented. An analysis of the converter about cooperation with inverters is presented. The use of magnetically coupled reactors made it possible to use a magnetic system with lower power and dimensions. Key words. voltage inverters; magnetically coupled reactors; converter; coupling; on-grid; isolated grid, PV.
Energy storage possibility for Energy Community
Authors: Kádár Péter ,   Óbuda University.  KVK Dept. of Power Systems, Alternative Energy Sources Knowledge Centre. Budapest. Hungary, Boross Norbert
Published: July 2024

Pilisszentlászló is a settlement of 1000 inhabitants in the Budapest agglomeration, in a hilly environment in Hungary. The municipality is committed to sustainability, including energy management. The village intends to establish an Energy Community, installing as many local small Photo Voltaic generation units as possible. Increasing the security of energy availability and energy storage were considered viable options. In this paper we investigate three possible and sustainable energy storage methods. We have also assessed the solutions by the life cycle analysis (LCA) approach, which examines the overall environmental impact instead of short-term financial aspects. We investigated the kinetic "energy train", the microPSP (Pumped Storage Plant) and the battery storage solutions. Conceptually, we also dealt with rolling stock and track for the “energy train” solution. Specific calculations were made with idealized storage units regarding the maximum amount of energy that can be stored. For certain spring/summer/autumn consumption and PV production scenarios, the optimal energy storage capacities were determined. Finally, we compared the three energy storage options that seem feasible in the village of Pilisszentlászló. Despite all our expectations, and the initial preference of the local community, our current best recommendation is the battery storage. Further studies may lead to other, improved solutions. Key words. Energy community, energy storage, kinetic energy train, microPumped Storage Plant.
Analysis of the operation of a Fresnel solar plant through experimental tests: Energy production and efficiency
Authors: Larra D. ,   Departamento de Ingeniería Mecánica, Energética y de los Materiales, Escuela de Ingenierías Industriales, Universidad de Extremadura. Badajoz. Spain, Miranda M.T. , Montero I. , Sepúlveda F.J. , Arranz J.I.
Published: July 2024

There is currently a lack of information on the real performance of concentrating solar systems using Fresnel collectors. In order to promote the penetration of this technology in industrial facilities with thermal demand, numerous daily operational tests have been carried out in a 105.6 m2 Fresnel solar plant in southwest Spain. An analysis has been conducted covering all months of the year and including real direct radiation data. The tests were classified according to their characteristics, and the duration, available solar energy, energy production, and real efficiency were calculated. The best operating conditions were achieved in summer, with an average daily energy production of 174.3 kWh in July and 160 kWh in August. The maximum average efficiency value, however, was reached in May, at 24.4%. The use of actual data measured at the solar plant provided information on the behaviour of a Fresnel installation under real operating conditions. Key words. Solar plant, linear Fresnel collector, performance analysis, energy production, efficiency.
Agrovoltaic systems for crop improvement in Equatorial Andean Regions
Authors: Serrano-Guerrero X. ,   Energy Transition Research Group, Universidad Politécnica Salesiana. Ecuador, Peralta-Álvarez J. , Quito-Zhinin M. , Barragán-Escandón E. , Zalamea-León E. ,   Facultad de Arquitectura y Urbanismo, Universidad de Cuenca. Ecuador
Published: July 2024

The current study evaluates the deployment of a grid-independent agrovoltaic system for maximizing land utilization and crop productivity. Through the utilization of solar energy, an integrated irrigation and monitoring system is incorporated to enhance crop growth. The project’s feasibility is evaluated from both technical and economic perspectives. The design of the photovoltaic system and the pumping system is customized to optimize efficient utilization of solar and water resources. The findings of this research demonstrate the viability of adopting an environmentally friendly approach. The utilization of photovoltaic solar energy for electricity generation can coexist with agriculture and complement each other.
End-to-End Move Prediction System for Indoor Rock Climbing: Beta Caller
Authors: Cardenas Kevin ,   University of Colorado, Colorado Springs, Semwal Sudhanshu , Maher James ,   University of Colorado, Colorado Springs,   United States Air Force Academy
Published: July 2024

We developed Beta Caller, an end-to-end system supporting the sport of rock climbing for climbers with visual impairment. Beta Caller provides real-time, audible instructions containing a prediction for the climber’s next move while they are actively climbing a rock wall. This system leverages computer vision techniques to collect key information about the climber’s environment, enabling Beta Caller to make move predictions on climbing walls it has never encountered before. Neural networks are used to predict where the climber should move next, based on information provided by the computer vision models. The predicted move is translated into a verbal message guiding the climber to the next hold and then transmitted via wireless headphones using a text-to-speech model. This novel idea makes one of the fastest growing sports in the world even more appealing and approachable to climbers with visual impairment, however, this tool can be utilized by all climbers to improve their climbing skills. Beta Caller achieved 80.08% accuracy predicting which limb the climber should move next and, when predicting the location of the next hold, Beta Caller achieved a bounding box error of only 6.79%. These results pioneer a strong foundation shaping the future landscape of rock climbing prediction tools for visually impaired climbers.
MinBackProp – Backpropagating through Minimal Solvers
Authors: Sungatullina Diana ,   CIIRC, CTU in Prague, Pajdla Tomas ,   FEE, CTU in Prague,   CIIRC, CTU in Prague
Published: July 2024

We present an approach to backpropagating through minimal problem solvers in end-to-end neural network training. Traditional methods relying on manually constructed formulas, finite differences, and autograd are laborious, approximate, and unstable for complex minimal problem solvers. We show that using the Implicit function theorem to calculate derivatives to backpropagate through the solution of a minimal problem solver is simple, fast, and stable. We compare our approach to (i) using the standard autograd on minimal problem solvers and relate it to existing backpropagation formulas through SVD-based and Eig-based solvers and (ii) implementing the backprop with an existing PyTorch Deep Declarative Networks (DDN) framework. We demonstrate our technique on a toy example of training outlier-rejection weights for 3D point registration and on a real application of training an outlier-rejection and RANSAC sampling network in image matching. Our method provides 100% stability and is 10 times faster compared to autograd, which is unstable and slow, and compared to DDN, which is stable but also slow.
Manifiesto por una academia queer
Authors: Gálvez Vidal Alba María , Viedma Guiard Andrés
Published: July 2024

.
El culo de Eros. Una arqueología de las contrasexualidades anales y sus micropolíticas queer
Authors: Damián León A.
Published: July 2024

: Retomando la metodología foucaultiana de la arqueología de las ideas y el concepto de «contrasexualidad» de Paul B. Preciado, en este artículo se realiza un análisis reflexivo sobre algunas nominaciones históricas para la práctica erótica de la penetración anal entre hombres, primero en los griegos y luego los años ochenta durante la crisis del sida, para contrastar de la manera más radical posible las apreciaciones sociales que se derivan de tal práctica. Si bien este marco analítico es experimental y parcial, pues no nos ocuparemos estrictamente de la historia del conocimiento sexual sino más bien de las reglas, efectos de sentido y códigos sobre dar y recibir por el culo, ensayaremos la construcción al modo de una ingeniería inversa sobre las formas de las experiencias singulares de Eros en la carne misma del cuerpo del sujeto del deseo, mediante la recuperación de pasados probables para imaginar el devenir queer de futuros posibles. Concluimos con una reflexión sobre la necesidad de teorizar críticamente las arqueologías y genealogías contrasexuales del placer de dar y recibir por el culo, así como sus antecedentes recientes con el fistfuck y la reactualización de las prácticas bareback.
Stay (Informed) at Home! A Foucauldian Analysis of the Digital LGBTQIA+ Responses to COVID-19 and the Cultural Memory of the HIV-AIDS Pandemic Activism
Authors: Bermúdez de Castro Acaso Juanjo
Published: July 2024

Following a Foucauldian approach, this paper analyses how LGTBQIA+ dating apps carried out measures of collective care and information during the early days of the COVID-19 crisis in similar ways to those learned from the joint fight during the emergence of HIV-AIDS. Not forgetting that their main concern was keeping their users on the apps as long as possible for economic reasons, hook-up apps such as Grindr, Scruff, Wapx, and MachoBB provided the LGBTQIA+ community with a series of supporting and protecting services against COVID-19:  enabling digital socialization to share worries and feelings; offering free professional psychological assistance; recommending sources of help to isolated LGBTQIA+ elders; providing information about COVID-19 and special protective measures for HIV+ people; organizing digital events and virtual dance parties; and giving emotional support and advice to chemsex users. At a greater scale, when HIV-AIDS first appeared in the early 1980s, activists rapidly responded by creating care and education centres, and undertaking initiatives that gave support and combated the stigma. Drawing on Foucault’s conceptualization of biosurveillance, ethics, and the politics of resistance as backbone and methodological frame, this paper analyses how the LGBTQIA+ dating apps responded to COVID-19 through lessons learned from the early fight against HIV-AIDS.
El expediente especial de invertidos. La represión de las disidencias sexo-genéricas en Canarias tras su inclusión en la Ley de Vagos y maleantes
Authors: Ramírez Pérez Víctor Manuel
Published: July 2024

En el año 1954 se reforma de la Ley de Vagos y Maleantes de 1933 para incluir la homosexualidad como una categoría de peligrosidad social. Esta reforma articula un nuevo mecanismo de represión de las disidencias sexuales y de género, que son puestas en el objetivo de las autoridades gubernativas y judiciales. El año siguiente, bajo las instrucciones del Gobernador Civil de la provincia de las Palmas, la Dirección General de Seguridad de esta provincia elabora 85 notas informativas de otras personas consideradas homosexuales y residentes, en su gran mayoría, en la ciudad de Las Palmas de Gran Canaria. En este artículo analizo los motivos por los que la citada capital canaria se convirtió en el núcleo de la represión en las islas, así como el proceso de elaboración de las notas, su contenido y los expedientes judiciales incoados en el Juzgado Especial de Vagos y Maleantes de Canarias en virtud de las mismas.
Pierwsze polonijne „wesołe gazetki” w Ameryce Północnej. Część II: od „Bociana” do „Maczugi”
Authors: Gerasik Janusz
Published: July 2024

Artykuł stanowi część drugą tytułowej problematyki. Pierwsze czasopisma humorystyczno‑satyryczne pojawiły się w latach 80. XIX w. Były efemerydami, które znikały już po kilku miesiącach. Dopiero tytuły powstałe w latach 90. XIX stulecia bytowały dłużej. W artykule przedstawiono zarys dziejów pierwszych czasopism humorystycznych w Chicago oraz przybliżono sylwetki ich wydawców i redaktorów. Pracę oparto głównie na analizie ówczesnych źródeł prasowych. Kwerenda wybranych tytułów prasy polonijnej i krajowej przyniosła szereg istotnych ustaleń, poszerzających wiedzę zawartą w dotychczasowej literaturze przedmiotu.
Doświadczenia cross- medialnego charakteru działalności ukraińskiej prasy na przykładzie pism lokalnych „Wysokyj Zamok” i „Kyiv Post” w warunkach wojny
Authors: Biłuszczak Tetiana
Published: July 2024

Celem opracowania jest porównanie cech systemu cross-medialnego na przykładzie wybranych tytułów ukraiń-skiej prasy lokalnej „Wysokyj Zamok” i „Kyiv Post” w czasach wojny. W badaniach wykorzystano przede wszyst-kim metodę analizy treści, metody porównawcze i systematyzujące. Ustalono, że kanały komunikacji stają się obecnie istotną częścią cross-medialnej produkcji i dystrybucji informacji. Zaletą takiej komunikacji jest to, że uzyskane w ten sposób informacje pozwalają na zachowanie przestrzeni osobistej przez konsumentów, pozwalają na interaktywny kontakt z mediami poprzez wersję online uzupełnioną o blogi, filmy, zdjęcia, komentarze, sondaże oraz rozszerzają proces komunikacji poprzez strony ulubionych mediów konsumenta w sieciach społecznościowych. W czasie wojny specyfika pracy mediów na każdej z platform charakteryzuje się w szczególności częstotliwością publikacji.
Framework for assessing the environmental impacts of intermodal transportation
Authors: Alves Wellington , Orfão Ana , Silva Ângela
Published: July 2024

This research aimed to use a sustainable approach based on the internalisation of external cost analysis of intermodal transportation of freight to assess the impacts of these activities on the environment. This research used two approaches to develop a model that illustrates the internalisation of the external cost of freight transport. The first approach was used to calculate the cost of emissions for each route considering the transportation and its’ cost in the country of destination. The second approach calculated the external cost considering only the distance travelled by the vehicle. The results showed that the companies operating in the selected scenarios would have to pay an additional cost for the transportation of goods. The scenarios had different pollutants emitted during the transportation, which means that the negative impact on human health and the environment is evident. The urgency to limit carbon dioxide and other greenhouse gases in the atmosphere has increased concerns for all activity sectors. Climate change has drawn the attention of governments, companies, and academics, promoting initiatives that mitigate the impact of their activities. The model for measuring emissions was used due to the need for a comprehensive cost analysis to further assess the impact on the environment. Regarding the internalisation of the external cost emissions, the findings showed that different scenarios had a different pollutant emitted during the transportation, which means that the negative impact for human health and the environment is evident. Findings also indicate that to minimise the impact during the transportation, considering the “user-pays principle”, these impacts should be discussed in more detail between stakeholders.
Sustainability and Industry 4.0 in the packaging and printing industry: a diagnostic survey in Poland
Authors: Gladysz Bartlomiej , Krystosiak Krzysztof , Buczacki Aleksander , Quadrini Walter , Ejsmont Krzysztof , Kluczek Aldona , Park Jonghun , Fumagalli Luca
Published: July 2024

Industry 4.0 (I4.0) became an important paradigm to bridge the gap between technologies and humans. The paper aims to diagnose sustainability performance and I4.0 maturity in Poland’s printing and packaging sector and identify research areas where further actions for improvements are necessary. This article adopts a mixed-method study combining in-depth interviews of eleven heterogeneous enterprises, supported with a quantitative survey on a representative sample of 301 companies. The findings revealed an insignificant correlation from a statistical point of view (0.44) between the adopted I4.0 technologies currently used and sustainable best practices. Internet of Things technologies are more often adopted in the printing industry (27.2 %) than in the packaging industry (14 %). The study concludes that using I4.0 technologies boosts the execution of sustainable practices and/or realising sustainable development practices requires I4.0 technology adoption. The paper clarifies that more in-depth analyses are needed to help achieve sustainable objectives for printing and packaging companies through digital technologies. The methodology is replicable and might be applied in other economies across separate multinational enterprises to influence sustainable digitalised business strategy.
Assessment of the occupational health and safety management system by qualimetric methods
Authors: Trishch Roman , Cherniak Olena , Zdenek Dufek , Petraskevicius Vladislavas
Published: July 2024

Requirements of the international standard ISO 45001:2018 were analysed to identify the need for monitoring, measuring and analysing the functioning of the occupational health and safety management system. This analysis has made it clear that the effectiveness of the development and implementation of the occupational health and safety management system depends on the assessment methodology. The study focused on existing studies and publications on the assessment of processes, including those related to occupational safety, assessment methods or qualitative methods, and statistical methods used for assessment. As a result, the topic has been proven relevant, and the goal of the article was determined: to study the possibility of using qualimetric methods for evaluating the labour safety management system. A survey was conducted among workers at a machine-building enterprise to evaluate the occupational health and safety management system. Verbal scales were proposed to process the study results as they allow quantitative ratings to be obtained on the coded scale of the desirability function. The study result is a technique for obtaining a quantitative assessment of the occupational health and safety management system. This technique is universal and can be applied to any enterprise. It can also be used to make managerial decisions regarding the improvement of the occupational health and safety management system.
Process security methods and measurement in the context of standard management systems
Authors: Kemendi Agnes , Michelberger Pal
Published: July 2024

The main purpose of the paper is to identify ways to establish process security in the constantly changing risk and control environment and to introduce a new model. The research is based on a literature review of process security components. Qualitative content analysis was used to establish a linkage between the certified management systems and the level of process security. Elaborations have been conducted based on the survey data of the International Standards Organisation (ISO) and served as a basis for analysis of certification types and their sectoral division in the European Union (EU) member states. A new Balanced Scorecard has been developed to cover the security pillars in the context of standard management systems and serve as a framework for process security measurement. The research paper processes the state-of-the-art issue of process security, introduces components that help to establish process security, and establishes a linkage between the level of process security and certified management systems. An analysis was based on the ISO certification information related to different management system standards. Management systems were analysed in the context of process security and corresponding process performance measures. A brief walkthrough has been prepared to demonstrate the processes behind the underlying performance measures. A new Balanced Scorecard approach has been developed that maps and covers different security aspects retrieved from and linked to different management system standards. The new Balanced Scorecard based on different security aspects of entities can be leveraged by any organisation, regardless of its size or business profile.
The fig-tree skeletonizer moth, Choreutis nemorana (Hübner, 1799) (Lepidoptera: Choreutidae), a new species for the Algeria fauna
Authors: Belguerri H. , Boulaouad B.A. , Bella S. , Belkacem M. , Harzallah B. , Bakhouche B.
Published: July 2024

The fig-tree skeletonizer moth, Choreutis nemorana (Hübner, 1799) (Lepidoptera, Choreutidae), is a widespread species in the Mediterranean region. In October 2023 and June 2024, during pest control operations as part of the harvesting campaign in the fig groves of the Bordj Ghedir and Wilaya de Bouira regions (Algeria), C. nemorana was documented for the first time in Algeria.
Doppler Ultrasonographic Indexes and Its Relation to Transplanted Kidney (Allograft) Function in Sulaimani City Centre
Authors: Hussein Ahmed Mahmood Hussein , Mazin Anwar Yadgar Alobaidi  , Karim Mahmood Hussein
Published: July 2024

Background: The measurement of  Doppler Ultrasonography(DU) indexes, including  resistive index (RI) and pulsatility index (PI), could assist in evaluating   an transplanted kidney. Aim of study: This work attempted at determining how  Doppler sonography indexes correlated with  transplanted kidney (graft) function. Methods: Our  cross-sectional study conducted  on 18 kidney transplanted patient (10 male and 8 female). In all cases, DU had been conducted upon  transplanted kidney. We analyzed  data on the  pulsatility index (PI) and  resistive index (RI)   in the interlobular arteries. Concurrent serum creatinine explored in comparison  to the DU results. . Results: The pi and Ri correlate  significantly , in liner manner  with serum creatinine (P = .005, and P=.002 respectively). Conclusion: The PI  and RI are important DU markers for determining the kidney allograft function.
Legge sulla cittadinanza, la residenza e l’accesso N. CXXXI – legislative reorganisation of the sitizenship of Vatican City-State
Authors: Witola Filip
Published: July 2024

The citizenship of the Vatican City State is characterised by individual features relating above all to the manner in which it is conferred and its forfeiture. The introductionof the legal category of Vatican nationality has its origins in the Lateran Treaty, but it was in 1929 when Pope Pius XI promulgated the law Legge sulla cittadinanza ed il soggiorno N. III concretising this institution which has lived to see its own reorganisation over time.Based on an analysis of Vatican legislation, it is possible to conclude that the present Vatican legislation is largely updated to current needs without losing its unique characteristics. The main intention was to present whether and how Legge sulla cittadinanza, la residenzae l’accesso N.CXXXI changes Vatican citizenship and what differences can be found in the newly created law. This process was based on a comparative method of legal acts, an analysis of the literature, as well as observation of interrelationships and dependencies. On the basis of this exercise, it was determined that the 2011 law remains within the original legal framework, but that its amendment is of a practical nature, intended to give individuals freedom of action and not to lead them to the appearance of possible negative consequences associated with the loss of citizenship.
Apocrine Hidrocystoma: A Candelabrum of the Eye – A Case Report
Authors: Patil Shrinivas , Iswariya J. , Bhatnagar Anuj , Mitra Debdeep , Mehta Ritu
Published: July 2024

Hidrocystomas are apocrine gland proliferations of the skin that are fluid filled and benign in nature. Two main types are recognised, namely apocrine and eccrine hidrocystoma, identified based on histological findings. Surgical excision is the treatment of choice, although various other modalities exist with varying success rates. We report a case of apocrine hidrocystoma, which is uncommonly reported, for which surgical excision gave good clinical and cosmetic outcomes.
Navigated focal laser photocoagulation of choroidal neovascularization in central serous chorioretinopathy
Authors: Vasilev A.S. ,   S.M. Kirov Military Medical Academy of the Russian Defense Ministry, Saint Petersburg, Burnasheva M.A. , Kazak A.A. , Kalinicheva Y.A. ,   S.M. Kirov Military Medical Academy of the Russian Defense Ministry, Saint Petersburg,   S.M. Kirov Military Medical Academy of the Russian Defense Ministry, Saint Petersburg,   S.M. Kirov Military Medical Academy of the Russian Defense Ministry, Saint Petersburg
Published: July 2024

Purpose. To study the efficacy and safety of focal navigated laser photocoagulation (FLC) in the treatment of central serous chorioretinopathy (CSCR) complicated by choroidal neovascularization (CNV). Material and methods. The study included patients with CSCR complicated by CNV, defined as the presence of characteristic OCT angiography features. All patients underwent FLP, in the area of CNV localization, using the NAVILAS 577 navigation laser system, followed by at least six months of followup. The main outcome measure was complete resolution of subretinal fluid (SRF) at the end of follow-up. Results.This study included 16 eyes of 16 patients (6 males and 10 females, mean age 59.3 ± 7.9 years). Mean baseline CNV area was 0.44 ± 0.23 mm2. All eyes achieved complete resolution of SRF at 1.1 ± 0.4 months after FLP. At the beginning and at the end of follow-up best-corrected visual acuity was 0.16 ± 0.17 and 0.07 ± 0.12 LogMAR (p = 0.12), respectively. Central retinal thickness decreased from 372.4 ± 83.06 to 215.3 ± 21.5 μm (p < 0.0001), while subfoveal choroidal thickness remained stable (344.6 ± 101.0 μm at baseline and 316.8 ± 99.9 μm at the end of the follow-up; p = 0.53). No visual or anatomical deterioration was observed during 11.5 ± 7.5 months of follow-up. Conclusion.Navigated FLP of the area of CNV is an effective and safe option in the management of CSCR complicated by relatively small extrafoveal neovascular membranes. Keywords: central serous chorioretinopathy, choroidal neovascularization, vascular endothelial growth factor, navigated laser therapy, focal laser photocoagulation, optical coherence tomography angiography
Clinical efficacy of medicine Thealoz in the treatment of patients with dry eye syndrome
Authors: Kalanov M.R. ,   Orenburg branch of The S. Fyodorov Eye Microsurgery Federal State Institution, Orenburg, Kim V.L. ,   Orenburg branch of The S. Fyodorov Eye Microsurgery Federal State Institution, Orenburg
Published: July 2024

Background.The prevalence of dry eye syndrome (DES) tends to further increase due to the widespread introduction of keratorefractive surgeries, the active use of computers, air conditioners, contact vision correction devices, and the spread of general diseases of the body. Assessing the clinical effectiveness of modern moisturizing and lubricating solutions for eye protection is an urgent scientific task in the framework of improving the treatment of dry eye syndrome. Purpose. To evaluate the clinical efficacy of the medicine “Thealoz” in the treatment of patients with dry eye syndrome. Material and methods. 34 patients (68 eyes) took part in the study. All patients were divided into two groups: group 1 – mild degree of DES (grade I), 22 eyes (32.35 %); group 2 – moderate degree of DES (II degree), 46 eyes (67.65 %). For the treatment of dry eye syndrome, the medicine “Thealoz” was used – 1 drop 3 times a day, for 1 month. The observation period was 1 month. Results.After a month of using the medicine, patients in both groups noted a significant improvement in the condition of the ocular surface. Almost complete restoration of the tear film was noted in patients of both groups. Evaluation of the results of the Schirmer test showed a significant decrease in total and main tear production to normal values. Conclusion.The use of the medicine “Thealoz” in the treatment of mild and moderate dry eye syndrome for 1 month increases the stability of the tear film (up to 36 %) and thereby helps to reduce subjective and objective signs of xerosis of the ocular surface. Keywords:dry eye syndrome, keratoconjunctivitis, eye protection solution, trehalose
Clinical case of Nd:YAG laser capsulotomy in a patient after Descemet stripping automated endothelial keratoplasty
Authors: Mihajlov I.M. ,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Popov A.B. ,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow
Published: July 2024

Relevance. Studies have shown that after laser capsulotomy, the average density of corneal endothelial cells (ADE) decreases. This can lead to corneal edema and a decrease in visual acuity. This is why it is important to take special care when treating secondary cataracts in patients who had Descemet stripping automated endothelial keratoplasty (DSAEK). Purpose. To demonstrate the effect of Nd:YAG laser capsulotomy on the average density of corneal endothelial cells in a patient who had DSAEK. Material and methods. Patient K., 38 years old. Diagnosis: OD Secondary cataract. Artifakiya. The condition after DSAEK. Examination before surgery: the eye is calm, the cornea and the posterior layered transplatat are transparent, the anterior chamber is deep, the posterior chamber IOL is in a capsule bag, in the correct position, fibrosis of the posterior capsule is moderate; Best-corrected visual acuity (BCVA) = 0.45. ADE = 646 cells/mm2. Intraocular pressure (IOP) = 11 mmHg. In February 2024, a Nd:YAG laser capsulotomy was performed on the Ellex Ultra Q Reflex. The minimum effective energy was selected – 1.4 mJ, the number of pulses – 36, the displacement of the focus point of the laser radiation relative to the focus of the navigation beam deep into 200 microns. Results.On the first day after the operation, during examination: the cornea is apparently unchanged, the IOL is in the correct position, the capsulotomic hole is formed, with a diameter of 5 mm. BCVA = 0.6. ADE = 639 cells/mm2, IOP = 16 mmHg. 1 month after surgery – without changes. Conclusion. To prevent a critical decrease in ADE, an individual approach is required with the selection of the minimum effective energy, not exceeding 1.5 mJ, and a shift in the focus of the working beam relative to the focus of the navigation beam deep into 200 microns. Keywords: laser capsulotomy, Nd:YAG, posterior automated layer-by-layer keratoplasty, endothelial dystrophy
Combined cataract and glaucoma surgery in eyes with ciliary ligamentous weakness
Authors: Sorokoletov G.V. ,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Kolysheva O.S. , Arisov A.A. , Luybimova T.S. ,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow
Published: July 2024

Purpose. To demonstrate the effectiveness of combined phacoemulsification of cataracts and antiglaucomatous surgery in cases of weakened zonular apparatus of the lens using the optic capture technology. Material and methods. The study included 24 eyes (24 patients) with complicated cataracts and primary open-angle glaucoma: stage 1–4 eyes (16.6 %), stage 2 – 10 eyes (41.6 %), stage 3–10 eyes (41.6 %). All patients had a concomitant condition – pseudoexfoliation syndrome with pronounced zonular weakness. The study involved 10 males and 12 females, with a mean age of 73 ± 5.7 years. Preoperative assessments showed Visual acuity 0.25 ± 0.15, IOP – 26.78 ± 7.26 mmHg, number of drops 3.04 ± 0.45, axial length – 23.88 ± 1.04 mm. All patients underwent a combined surgery: phacoemulsification of cataracts using the optic capture technology and non-penetrating deep sclerectomy with Healaflow drainage. Results. One year later, Visual acuity was 0.6 ± 0.21, IOP was 16.90 ± 3.25 mmHg without hypotensive therapy. According to OCT results, no signs of glaucoma progression were detected in the optic nerve disc and nerve fiber layer. Throughout the observation period, the intraocular lens remained in the correct position, with pronounced intrascleral space and preservation of surgically created pathways for intraocular fluid outflow. Conclusion.The combined surgery for glaucoma and cataracts in patients with lens subluxation, using the optic capture technique and non-penetrating deep sclerectomy, allowed for maintaining the correct and stable position of the intraocular lens (IOL) with normalization of intraocular pressure without the use of hypotensive therapy throughout the observation period. Keywords: one-stage surgery, primary angle-closure glaucoma complicated by cataract, optic capture
Detection and treatment of active retinopathy of prematurity by specialists of the federal ophthalmology clinic in a perinatal center
Authors: Akhmedova S.U. ,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga, Ivanova N.A. , Tereshchenko A.V. , Trifanenkova I.G. , Isaev S.V. , Vydrina A.A. ,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga,   Medical Institute of the Kaluga State University named after K.E. Tsiolkovski, Kaluga,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga,   Medical Institute of the Kaluga State University named after K.E. Tsiolkovski, Kaluga,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga
Published: July 2024

Purpose. To analyze the incidence, structure and methods of treatment of active retinopathy of prematurity (ROP) in a modern high-tech perinatal center by specialists from the federal ophthalmology clinic. Material and methods. The study included the results of ophthalmological examinations of 979 premature infants. The body weight of children at the time of birth is 460– 2200 g. Gestation period of children is 22–36 weeks. Nursing of children was carried out in the conditions of the perinatal center of the Kaluga Regional Clinical Hospital from 2021 to 2023. If there were indications, a visiting team of ophthalmic surgeons from the Kaluga branch of the MNTK “Eye Microsurgery” performed laser coagulation of the retina and intravitreal injections of ranibizumab in the perinatal center for premature infants with detected ROP. Treatment activities were carried out on the basis of the Kaluga branch of the MNTK “Eye Microsurgery”, if the somatic status of the premature infant allowed its transportation. Results.When analyzing the study results, ROP was detected in 125 children (12.77 %) out of 979. An inverse relationship was revealed between the gestational age at the time of birth and the frequency of progressive pathology. In children born at a gestation period of 22 weeks or more with severe concomitant somatic pathology and located in the perinatal center, treatment for ROP was necessary at an early post-conceptional age – 34.5 ± 1.9 weeks (9 ± 1.8 weeks of life). The conditions of the hightech perinatal center provided the possibility of performing surgery to patients of this category in full. Conclusion.Treatment of active ROP in the early stages in a high-tech perinatal center can prevent the development of severe stages of the disease. Treatment success rates were 40 %, 77.3 %, and 100 % in 2021, 2022, and 2023, respectively. A complete transition of the treatment of active ROP to the method of intravitreal administration of an angiogenesis inhibitor has been achieved in a high-tech perinatal center. Keywords:retinopathy of prematurity, perinatal center
Ophthalmosurgical complications arising in patients with chronic viral liver diseases with chronic viral liver diseases
Authors: Yusupov A.F. ,   Republican Specialized Scientific and Practical Medical Center of Eye Microsurgery, Tashkent, Karimova M.H. , Akhmedov T.B. , Abdullaeva S.I. ,   Republican Specialized Scientific and Practical Medical Center of Eye Microsurgery, Tashkent,   Republican Specialized Scientific and Practical Medical Center of Eye Microsurgery, Tashkent,   Republican Specialized Scientific and Practical Medical Center of Eye Microsurgery, Tashkent
Published: July 2024

The liver is the source of metabolic energy for our body. Every year, about 1 million people die from complications of the hepatitis B virus, which ranks 10th among all causes of death. According to the World Health Organization, 3 % of the world’s population (about 170 million people) are infected with the hepatitis C virus, and in 85 % of cases the disease becomes a chronic process, ending in liver cirrhosis or primary liver cancer within several 15–25 years. The retinal C antigen and the DNA structure of the hepatitis B virus are molecularly similar. The hepatitis B virus antigen is found in the stroma of the cornea, in the capsule of the lens, and in the membrane of the iris. This leads to congenital and acquired cataracts, uveitis of varying degrees and keratopathies. Damage to the endothelium of the vascular layer under the influence of HBV leads to the development of choroiditis, cyclitis, iridocyclitis and iritis. These changes affect stone metabolism and lead to the development of cataracts. Hepatitis B virus was detected in the recipient’s blood after keratoplasty by a donor HBV carrier. Hepatitis B was observed in almost half of patients with endogenous uveitis. After acute hepatitis B, laboratory studies confirmed the release of HBsAg in the tears, in the anterior chamber fluid and in the subretinal fluid of patients. HBV markers are found in the eye tissues of 11–60 % of patients who are carriers of the hepatitis B virus and are not detected in the blood. Keywords: vitrectomy, cataract phacoemulsification, hyphema, hypopyon
The laboratory diagnostics of the status of the ocular surface in patients with refractive profile
Authors: Mushkova I.A. ,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Borzenok S.A. , Karimova A.N. , Obraztsova M.R. , Khubetsova M.K. , Ostrovskiy D.S. ,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow,   S. Fyodorov Eye Microsurgery Federal State Institution, Moscow
Published: July 2024

Dry eye syndrome (DES) is a multifactorial disease of the ocular surface, which is based on the development of hyperosmolarity, inflammation and sensorineural disorders due to an imbalance of the structural components of the tear film. The main complaints of refractive patients after keratorefractive surgery are a feeling of dryness in the eyes, a foreign body, redness, blurring of the image, which is due to the clinical manifestations of post-refractive DES. Today, along with the general standard and modern methods of examining the ocular surface, laboratory screening also occupies an important place. Modern laboratory diagnostics of DES includes examination of tears and goblet cells of the conjunctiva to identify potential root causes of this condition. Enzyme immunoassay is a sensitive and specific method for the quantitative determination of inflammatory mediators in lacrimal fluid. To assess the condition of the aqueous mucin layer of the tear film, it is possible to conduct a cytological examination of the conjunctiva in order to verify the diagnosis of DES. Keywords:tear film, dry eye syndrome, cytokines, goblet cells, keratorefractive surgery
Multimodal approach in the diagnosis of choroidal nevi and melanomas
Authors: Belyaeva A.I. ,   Novosibirsk branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Novosibirsk, Stanishevskaya O.M. , Atamanov V.V. , Chernykh V.V. ,   Novosibirsk branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Novosibirsk,   Novosibirsk branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Novosibirsk,   Novosibirsk branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Novosibirsk
Published: July 2024

Background.The multimodal approach plays a key role in the diagnosis and monitoring of nevi and melanomas of the chorioidea. Currently, this approach is being actively developed and demonstrates its effectiveness in clinical practice. Combined use of various diagnostic methods in ophthalmology allows obtaining complete information about the nevi and deciding further tactics of patient management. Purpose. To identify the combination of multimodal imaging risk factors and prognostic value of chorioidal nevus transformation to melanoma. Material and methods. Analysis of patients diagnosed with chorioideal nevus and melanoma. All patients underwent standard ophthalmologic examination, ophthalmoscopy with Volk 78D non-contact lens, ultrasound (USG), optical coherence tomography (OCT) through the focus of the mass and OCT in angioregime (OCT-A) (Optovue RTVue-100.), wide-field photoregistration and autofluorescence of the ocular fundus (Zeiss Clarus™ 500). Results. Multimodal methods such as: Ultrasound, OCT through the lesion and OCT-A, wide-field photoregistration and ocular autofluorescence allow early detection of nevus transfomation into melanoma. These signs include an increase in the mean diameter and thickness of the mass, the appearance of subretinal fluid on optical coherence tomography, and an increase in lipofuscin autofluorescence. According to the literature, initial MX on OCTA examination is characterized by: irregular large-mesh vasculature in the outer nuclear layer and in the choriocapillary layer. Conclusion.A multimodal approach is used to document and diagnose chorioideal masses, to detect growth and progression at followup visits, and therefore to identify risk factors for transformation. Keywords: chorioideal nevus, melanoma, multimodal approach
Clinical case of Vogt–Koyanagi–Harada syndrome
Authors: Erokhina E.V. ,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga, Ilyina Y.L. , Shurinova E.A. ,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga,   Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Kaluga
Published: July 2024

Purpose. To analyze a clinical case of Vogt–Koyanagi–Harada syndrome and evaluate the effectiveness of prescribed systemic corticosteroid therapy. Material and methods. Patient K., 17 years old, female, Korean, addressed the Kaluga branch of the Eye Microsurgery MNTK in early January 2023. Complaints: low vision, feeling of blurring in both eyes. According to the patient, at the beginning of December 2023, she noted redness in both eyes, and therefore contacted an ophthalmologist at her place of residence. The ophthalmologist diagnosed “Conjunctivitis OU” and prescribed the drugs Signicef and Visalergol. During the therapy, the state of visual functions worsened, and the above-mentioned complaints appeared. Results.At the time of addressing to the Kaluga branch of Eye Microsurgery, the visual acuity of both eyes was 0.3 and could not be corrected. Intraocular pressure indicators corresponded to the norm – 16 mmHg OU. Based on the complaints, medical history, ethnicity of the patient, objective examination data and the results of additional research methods, a diagnosis of Panuveitis, Vogt–Koyanagi–Harada Syndrome OU was established. Due to the fact that the patient did not have a full range of symptoms (vitiligo, graying of hair, poliosis, alopecia), to clarify the diagnosis, the patient was referred for consultation to the Federal State Budgetary Institution “National Medical Research Center for Eye Diseases named after. Helmholtz” of the Ministry of Health of Russia. At the Helmholtz Clinic, the diagnosis was confirmed and treatment was prescribed: glucocorticosteroid therapy in the pulse therapy mode (prednisolone at a dosage of 40 mg). Positive dynamics were noted at the follow-up examination in 10 days after the prescribed treatment. Conclusion.The analysis of the presented clinical case is of interest due to the rare occurrence of Vogt–Koyanagi–Harada syndrome, and most importantly, early detection – a month after the onset of the disease (which is extremely rare), when there are no extensive manifestations of the skin. Adequate therapy for this disease made it possible to achieve stabilization of the condition in a short time and avoid such severe complications as cataracts, secondary glaucoma, choroidal neovascular membrane, exudative retinal detachment, and subatrophy of the eyeball. Keywords:clinical case, Vogt–Koyanagi–Harada syndrome, systemic corticosteroid therapy
EXISTENTIAL PROBLEMS OF BEING IN THE CONTEXT OF THE DEVELOPMENT OF DIGITAL FORMS OF COMMUNICATION
Authors: Албакова Ф.Ю.
Published: July 2024

Актуальность исследования обусловлена экзистенциальной проблематикой современного бытия человека в контексте цифровых форм коммуникации. В статье рассмотрена специфика цифрового пространства, вирутализированный мир интерактивной деятельности, потеснивший мир непосредственного интерсубъективного взаимодействия людей. На основании экзистенциально-феноменологического подхода раскрыта трансформация мира экзистенциальных переживаний человека, интерсубъективного взаимодействия в акте лицом-к-лицу под влиянием цифровых технологий. Выявлена связь интерсубъективного повседневного мира и экзистенциального переживания, редукция традиционных онтологических смыслов бытия, распространение упрощенных схем языковых коммуникаций в условиях широко распространения цифровых технологий. Обоснован тезис о том, что экзистенциальный мир человека, содержание смысловых переживаний его существования и творческий опыт сопряжены с интерсубъективным миром непосредственного общения с Другим. Материалы статьи могут представлять научно-практический интерес для исследований проблем экзистенциального бытия в контексте цифровых форм коммуникации.

The relevance of the study is due to the existential problematics of modern human being in the context of digital forms of communication. The article deals with the specifics of digital space, the virutized world of interactive activity, which pressed the world of direct intersubjective interaction of people. On the basis of the existentialphenomenological approach, the transformation of the world of existential human experiences, intersubjective interaction in the act of facetoface under the influence of digital technologies is revealed. The connection of the intersubjective everyday world and existential experience, the reduction of traditional ontological meanings of being, the distribution of simplified linguistic communication schemes in the conditions of widespread digital technologies are revealed. The thesis is substantiated that the existential world of a person, the content of semantic experiences of his existence and creative experience are connected with the intersubjective world of direct communication with the Other. The materials of the article may be of scientific and practical interest for researching the problems of existential being in the context of digital forms of communication.