bluuebunny/crossref_metadata_2025 huggingface dataset:
Robust Neural Control of Wind Turbine Based Doubly Fed Induction Generator and NPC Three Level Inverter
Authors: Narimene Khadraoua , Kheira Mendaz , Mohamed Flitti
Published: May 2022

This paper presents dynamic modeling and control of Doubly Fed Induction Generator (DFIG) based on wind turbine systems, where the stator of DFIG is directly connected to the grid and the rotor was fed by a three level PWM NPC inverter. The active and reactive power control of the DFIG is based on the feedback technique by vector control method by using a classical regulator of Proportional-Integral (PI) type which allows us, in association with the looping of powers, to obtain an efficient and robust system. This approach is a very attractive solution for devices using DFIG as wind energy conversion systems; because, it is a simple, practical implementation, commonly applied in the wind turbine industry and it presents very acceptable performance, However, this control approach has certain limitations and has several causes, vector command with NPC three-level inverter pulse width modulation (PWM) is used to control the reactive power and active power of the generator. Then, use the neural network design to replace the traditional proportional-integral (PI) controller. Finally, the Matlab/Simulink software is used for simulation to prove the effectiveness of the command strategy.
Survei Konsumsi Sayur dan Buah pada Remaja di SMA Negeri 5 Jayapura
Authors: Woisiri Stuard Aldo , Mangalik Gelora , Nugroho Kristiawan Prasetyo Agung
Published: May 2022

Data Riskesdas 2018 menunjukkan bahwa penduduk Indonesia berumur ≥ 10 Tahun mempunyai kecenderungan kurang mengkonsumsi sayur dan buah sesuai standart pedoman gizi seimbang yaitu kurang dari 400 gr/orang/hari yang terdiri dari 250 gr sayur dan 150 gr buah dalam sehari mencapai 95,5. Di Provinsi Papua, hasil Riskesdas 2018 menunjukkan bahwa penduduk tidak mengkonsumsi buah dan sayur mencapai 95%. Tujuan dari penelitian ini adalah untuk mengidentifikasi tingkat konsumsi buah dan sayur dan tingkat asupan zat makro dan mikro pada anak remaja di SMA Negeri 5 Jayapura. Penelitian ini menggunakan metode deskriptif kuantitatif dengan jenis penelitian studi cross sectional. Penelitian ini dilakukan di SMA Negeri 5 Jayapura pada bulan Januari-Maret 2021. Sampel target dalam penelitian ini adalah 50 siswa-siswi kelas 10-11 dengan usia 15-18 tahun. Teknik pengambilan sampel dilakukan secara acak sistematis (sistematic random sampling). Instrumen penelitian yang digunakan pada penelitian ini adalah kuisioner yaitu Semi Quantitave Food Frequency Questioner (SQ-FFQ) dan recall 2x24 jam. Data yang telah dikumpulkan disajikan dalam tabel distribusi frekuensi kemudian dianalisis secara deskriptif. Hasil dari penelitian ini menunjukan rata-rata konsumsi sayur dan buah siswa sangat rendah yaitu sayur frekuensi konsumsi sayur 0,09 kali/hari dengan rata-rata berat 4,41 gram/hari dan buah 0,16 kali/hari dengan rata-rata berat 38,59 gram/hari. Tingkat asupan zat gizi makro defisit yaitu energi (29 siswa),protein (36 siswa), lemak (33 siswa) dan karbohidrat (47 siswa) dan  asupan zat gizi mikro yang kurang yaitu 50 siswa kurang mengonsumsi serat dan kalsium, 32 siswa kurang mengonsumsi magnesium dan 47 siswa kurang mengonsumsi zat besi.
Pemenuhan Kebutuhan Ibu Bersalin di Masa Pandemi COVID-19
Authors: Rohmah Fayakun Nur
Published: May 2022

Pandemi COVID-19 menyebabkan meningkatkan kecemasan pada ibu dalam proses  melahirkan  karena mengkhawatirkan beberapa hal diantaranya tentang screening COVID-19 sebelum melahirkan, pembatasan jumlah pendamping, kekhawatiran mengeni kesehatan diri dan banyinya serta kualitas layanan yang tidak sesuai harapan sehingga tidak memenuhi kebutuhannya selama persalinan. Tujuan penelitian ini adalah untuk mengetahui gambaran pemenuhan kebutuhan ibu bersalin di masa pandemi COVID-19. Penelitian ini merupakan penelitian kuantitatif deskriptif dengan pendekatan cross sectional. Sampel diambil menggunakan Teknik  purposive sampling sebanyak 40 pasien ibu yang bersalin secara spontan. Mayoritas ibu bersalin sebanyak 65% merasa telah terpenuhi kebutuhan baik secara fisik, psikologis, informasi dan sosial. Saran ibu hamil memperkaya pengetahuan untuk mempersiapkan diri secara fisik dan psikologis menjelang persalinan.
Hubungan Posisi Kerja saat Bekerja dari Rumah terhadap Keluhan Otot Rangka pada Pegawai Kementerian Kesehatan
Authors: Dewi Dara Puspita , Adnan Nurhayati
Published: May 2022

Penerapan konsep bekerja dari rumah/ Work From Home dapat menimbulkan permasalahan baru ketika lingkungan kerja yang ergonomis tidak tersedia di rumah. Bervariasinya posisi kerja saat menggunakan laptop/notebook menjadi salah satu faktor risiko munculnya keluhan otot rangka pada bagian tubuh. Tujuan dari penelitian ini adalah untuk menganalisa hubungan posisi kerja saat bekerja dari rumah terhadap keluhan otot rangka. Penelitian menggunakan desain studi potong lintang/cross sectional dengan jumlah responden sebanyak 307 pegawai Kementerian Kesehatan yang bekerja menggunakan laptop/notebook. Pengumpulan data menggunakan kuesioner daring dan disebar secara acak kepada seluruh pegawai. Hasil menunjukkan sebanyak 31,6% responden selalu (lebih dari 3 jam) bekerja dengan posisi duduk di lantai menggunakan meja, 17,25% biasanya (1-3 jam) duduk di kursi tanpa sandaran /sofa/lantai tanpa meja dan 30,9% tidak pernah duduk di kursi dengan sandaran dan meja. Sebanyak 88.6% pegawai merasakan adanya keluhan otot rangka selama bekerja dari rumah dengan keluhan terbanyak di bahu (78,26%), punggung atas (72,3%) dan leher (68,1%). Hasil uji statistik menggunakan Cox Proportional Hazard Regression menunjukkan tidak ditemukan adanya hubungan yang bermakna secara statistik antara posisi kerja duduk di kursi dengan sandaran dan menggunakan meja saat bekerja dari rumah terhadap keluhan otot rangka yang dirasakan pegawai (Pv = 0,729).
Ascertaining foraging rate of pollinators in Ricinus communis L. in Haryana, India
Authors: Nayak Sudhanshu Bala , Yadav Manish K , Nihal R. , Ramalakshmi V. , Dash Lipsa , Padhy Deepayan
Published: May 2022

Foraging rate of different pollinator species under the genus Apis and non-Apis studied on two castor (Ricinus communis) hybrid under agro-ecological conditions of Haryana, revealed that irrespective of interspecific variation, the maximum foraging rate was found associated with Apis florea followed by A. dorsata, A. cerana and A. mellifera. Further, Eristalnus sp. visits of flowers were the lowest. Adding to the visiting frequency, honey producing bees (Apis sp.) visited significantly more flower per unit time compared to other pollinators (non-Apis) species. The study gave an idea of different foraging rates of different pollinators on castor flower.
Investigation of the Relationship Between Psychological Counselors' Psychological Resilience and Organizational Happiness
Authors: Güzel Kayaalp Hilal , Camadan Fatih
Published: May 2022

In this study, the relationship between psychological counselors' psychological resilience and organizational happiness was examined. This research was carried out within the scope of the relational screening model. As a data collection tool in the research; Well-Being at Work Scale, Brief Resilience Scale and Personal Information Form were used. The research was conducted with 310 psychological counselors. The organizational happiness of the psychological counselors did not show a significant difference according to the variables of gender, type of organization, level of organization the situation of the psychological counselors being assigned to another organization other than the organization where they work did not and term of office. However, it showed a significant difference according to being assigned in jobs other than psychological counseling. In addition, it was determined that there is a positive, moderate, and significant relationship between the psychological resilience of psychological counselors and organizational happiness levels and psychological resilience predicts 20% of organizational happiness. In future research, psychological counselors' organizational happiness and psychological resilience may be examined by considering different variables such as personality traits, professional self-efficacy perceptions, professional sense of self, the number of students per counselor, the number of psychological counselors working in the organization and the facilities of the organization.
Okuma Kulüplerinin İşlevleri ve Okuma Kültürüne ve Alışkanlığına Etkileri
Authors: Yılmaz Bülent , Cengiz Emine
Published: May 2022

Okuma kavramı temelinde gönüllü olarak bir araya gelen ve düzenli biçimde çeşitli okuma etkinlikleri gerçekleştiren topluluklar olan okuma kulüpleri çeşitli genel işlevleri yanı sıra okuma kültürünün/alışkanlığının oluşturulmasında ve geliştirilmesinde önemli rollere sahiptir. Bu çalışmanın amacı, ODTÜMD (Orta Doğu Teknik Üniversitesi Mezunlar Derneği) Edebiyat Kulübü’nün, üyelerin sosyal, kültürel, ruhsal, entelektüel yaşamları, kişisel gelişim ve dil-iletişim becerileri ile okuma kültürleri/alışkanlıkları üzerindeki etkilerini ortaya koymaktır. Bu amaç çerçevesinde betimleme yöntemi ile gerçekleştirilen çalışmada halen çalışmalarını etkin biçimde sürdüren ODTÜMD Edebiyat Kulübü’nün 142 üyesine anket uygulanmıştır. Araştırmada kulüpte gerçekleştirilen okuma etkinliklerinin, üyelerin sosyal, kültürel, ruhsal, entelektüel yaşamları, kişisel gelişim ve dil-iletişim becerileri ile okuma kültürlerini/alışkanlıklarını çeşitli açılardan olumlu yönde etkilediği ve üyelerin kulübün işleyişinden memnun oldukları sonucuna ulaşılmıştır. Çalışma sonunda hem genelde okuma kulüpleri hem de ODTÜMD Edebiyat Kulübü’ne yönelik bazı önerilerde bulunulmuştur.
Öğretmen Adaylarının Öğretim Teknolojileri Dersinde Stop-Motion Uygulamalarına İlişkin Görüşleri
Authors: Türksoy Enver , Altıntaş Gülşen
Published: May 2022

Bu araştırma sınıf öğretmen adaylarının eğitim-öğretimde teknolojiyi kullanabilme ve öğretim amaçlı teknolojik materyal hazırlayabilme konusunda, stop-motion uygulamalarına ilişkin görüşlerini tespit etmeyi amaçlamıştır. Araştırma nitel araştırma paradigmasında düzenlenip, temel nitel araştırma modeline göre desenlemiştir. Araştırma verileri araştırmacılar tarafından geliştirilen görüş formu ile toplanmıştır. Veriler uygulama süreci sonrasında öğretmen adayları ile yapılan yüz yüze görüşmelerle toplanmıştır.  Sonrasında betimsel analizi yapılarak frekans ve yüzde hesaplamaları yapılmıştır. Araştırma 2019-2020 öğretim yılı Kırşehir Ahi Evran Üniversitesi, Eğitim Fakültesi Temel Eğitim Bölümü Sınıf Öğretmenliği Anabilim dalı 2. sınıfında öğrenim gören 24 öğretmen adayı ile yürütülmüştür. Araştırma sonuçlarına göre öğretmen adayları stop-motion uygulamalarında grup halinde çalışmayı öğretme, öğrenme yeterliliği sağlama, düşünceleri birleştirme, iş birliği sağlama, farklı fikir oluşturma, sorumluluk alma, kalıcı öğreneme sağlama, ortak karar verebilme, hatalarını fark etme, konuyu daha iyi anlama, araştırma yapma gibi temalar çerçevesinde olumlu görüş belirtmişlerdir. Kadın katılımcılar stop-motion hazırlarken erkeklerden daha çok sorun yaşadıklarını belirmişlerdir. En çok karşılaştıkları sorunlar; ses ve görseli birleştirmede, resimlerin uyumu, fotoğrafların birleştirme, fotoğrafların netliği ve teknik sorunlar, fotoğrafların çokluğu, belirli bir düzene sokamama, konu bulmakta sorun ve kazanımlara uyum sağlayamama olmuştur.
Uzaktan Eğitim Sonrası Fen Bilimleri Öğretmenlerinin Fen Öğretimine Yönelik Görüşleri
Authors: Bakioğlu Büşra , Çevik Mustafa
Published: May 2022

Bu araştırmanın amacı, COVID-19 salgını henüz devam ederken uzaktan eğitim sonrası yeni normalleşmeyle birlikte Fen Bilimleri öğretmenlerinin sınıflarında yüz yüze gerçekleştirdikleri fen öğretimine ilişkin görüşlerinin alınmasıdır. Araştırma, temel nitel araştırma deseni ile gerçekleştirilmiştir. Araştırmanın katılımcı grubu, amaçlı örnekleme yöntemiyle seçilmiş, 56 (36 kadın ve 20 erkek) Fen Bilimleri öğretmeninden oluşmuştur. Araştırmacılar tarafından oluşturulmuş yapılandırılmış görüşme formu yoluyla veriler toplanmıştır. Toplanan veriler içerik analizi yöntemiyle değerlendirilmiştir. Araştırma sonunda uzaktan eğitim sonrası Fen Bilimleri öğretmenlerinin derslerinde etkileşimli tahta, EBA ve Web 2.0 araçları odaklı öğretime yer verdiklerini ve daha öğrenci merkezli bir öğretim yöntemi takip ettiklerini dile getirmişlerdir. Sınıf içinde uzaktan eğitim sonrasında mesleki doygunluğu daha çok hissettiklerini ve verimli olduklarını söylemişlerdir. Bunun yanı sıra öğrencilerin sınıf içinde derslere odaklanma problemi yaşadıklarını ve salgın önlemlerinin (maske, mesafe vb.) kendilerini sınıf içerisinde sınırlandırdığını dile getirmişlerdir.
Incidencia de la COVID-19 en la situación financiera de la Cooperativa de Transporte Manabí (CTM)
Authors: Solórzano-Cedeño Karla , Mendoza-Saltos María
Published: May 2022

Las consecuencias en la disminución financiera de la Cooperativa de Transporte de Manabí (CTM), está reflejada por las medidas de confinamiento, cierre de operaciones provocados por la COVID-19, dicha situación golpea a las diferentes actividades productivas y de servicios, lo que ha ocasionado que las diferentes empresas traten de identificas e implementar acciones que protejan el sector económico de las personas y que a la vez se permita en el corto plazo normalizar sus actividades. Tanto así, que el sector de la transportación ha sufrido grandes pérdidas económicas por motivos de las medidas tomadas para mitigar la propagación de la pandemia, se ha tenido que sufrir múltiples cambios, por ello, el presente trabajo tiene como objetivo analizar el impacto de las medidas de mitigación de la COVID-19, en las finanzas de la cooperativa de transporte Manabí, para lo cual se desarrolló una investigación de tipo mixto, representada en el conjunto de procesos sistemáticos, empíricos y críticos, basada en la recolección y el análisis de datos, a través de las técnicas empleadas como la observación y entrevistas estructuradas a sus accionistas, lo que permitió cuantificar el grado de afectación financiera que ha tenido cada uno de ellos, llevando a cabo un estudio de carácter comparativo, que refleje las condiciones reales que afronta el gremio de transportista de la compañía de transporte Manabí, en base a sus ingresos actuales y costos para determinar su impacto antes y durante la pandemia.
influencia del marketing digital en la decisión de compra de los consumidores de Etafashion
Authors: Román-Aguirre Yaritza , Tarambis-Morales Andrea , Moscoso-Parra Ana
Published: May 2022

Ante la evolución digital que ha dado el mundo en los últimos tiempos las empresas han cambiado su forma de vender aplicando el marketing digital. Por motivos de pandemia las empresas se vieron obligadas a mantener cero contactos con los clientes, donde el marketing digital creció en gran porcentaje a nivel mundial buscando satisfacer las necesidades de sus consumidores.  El siguiente artículo tiene como objetivo determinar la influencia del marketing digital en el proceso de decisión de compra de los consumidores de la empresa Etafashion a través de una investigación cuantitativa para diagnosticar la situación actual en torno a la aplicación de marketing digital. El estudio aplicado es de enfoque cuantitativo con una muestra de 384 clientes de Etafashion. Los resultados fueron positivos en respuesta a la pregunta planteada en el estudio, demostrando que si se observa influencia entre marketing digital y el proceso de decisión de compra en los consumidores de Etafashion A partir del presente trabajo se pueden direccionar nuevas investigaciones en otras provincias, donde el sector retail dinamiza la economía ecuatoriana, para de esta manera estudiar el proceso de decisión de compra de los consumidores, no solo en el contexto local y que puedan servir de base para proyectos de marketing digital.
The Kernohan-Woltman Notch Phenomenon : A Systematic Review of Clinical and Radiologic Presentation, Surgical Management, and Functional Prognosis
Authors: Beucler Nathan , Cungi Pierre-Julien , Baucher Guillaume , Coze Stéphanie , Dagain Arnaud , Roche Pierre-Hugues
Published: May 2022

The Kernohan-Woltman notch phenomenon (KWNP) refers to an intracranial lesion causing massive side-to-side mass effect which leads to compression of the contralateral cerebral peduncle against the free edge of the cerebellar tentorium. Diagnosis is based on “paradoxical” motor deficit ipsilateral to the lesion associated with radiologic evidence of damage to the contralateral cerebral peduncle. To date, there is scarce evidence regarding KWNP associated neuroimaging patterns and motor function prognostic factors. A systematic review was conducted on Medline database from inception to July 2021 looking for English-language articles concerning KWNP, in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. The research yielded 45 articles for a total of 51 patients. The mean age was 40.7 years-old and the male/female sex ratio was 2/1. 63% of the patients (32/51) suffered from head trauma with a majority of acute subdural hematomas (57%, 29/51). 57% (29/51) of the patients were in the coma upon admission and 47% (24/51) presented pupil anomalies. KWNP presented the neuroimaging features of compression ischemic stroke located in the contralateral cerebral peduncle, with edema in the surrounding structures and sometimes compression stroke of the cerebral arteries passing nearby. 45% of the patients (23/51) presented a good motor functional outcome; nevertheless, no predisposing factor was identified. A Glasgow coma scale (GCS) of more than 3 showed a trend (p=0.1065) toward a better motor functional outcome. The KWNP is a regional compression syndrome oftentimes caused by sudden and massive uncal herniation and leading to contralateral cerebral peduncle ischemia. Even though patients suffering from KWNP usually present a good overall recovery, patients with a GCS of 3 may present a worse motor functional outcome. In order to better understand this syndrome, future studies will have to focus on more personalized criteria such as individual variation of tentorial notch width.
Neuromodulation for Trigeminal Neuralgia
Authors: Chung Moonyoung , Huh Ryoong
Published: May 2022

Clinical studies on neuromodulation intervention for trigeminal neuralgia have not yet shown promising results. This might be due to the fact that the pathophysiology of chronic trigeminal neuropathy is not yet fully understood. Chronic trigeminal neuropathy includes trigeminal autonomic neuropathy, painful trigeminal neuropathy, and persistent idiopathic facial pain. This disorder is caused by complex abnormalities in the pain processing system, which is comprised of the affective, emotional, and sensory components, rather than mere abnormal sensation. Therefore, integrative understanding of the pain system is necessary for appropriate neuromodulation of chronic trigeminal neuropathy. The possible neuromodulation targets that participate in complex pain processing are as follows : the ventral posterior medial nucleus, periaqueductal gray, motor cortex, nucleus accumbens, subthalamic nucleus, globus pallidus internus, anterior cingulate cortex, hypothalamus, sphenopalatine ganglion, and occipital nerve. In conclusion, neuromodulation interventions for trigeminal neuralgia is yet to be elucidated; future advancements in this area are required
Stability of Extruded Concrete for Road Safety Barriers and Effect of Mineral Admixtures on Concrete Behaviour
Authors: Nassima Kerboua , Fattoum Kharchi
Published: May 2022

Concrete barriers are distinguished by an extrudable character that facilitates their implementation using slipform machines. The first objective of this study was to formulate an extruded concrete in order to achieve stable road safety barriers with a flat-face. The tests were first carried out at the laboratory; then the most promising ones were tested on site. It was noted that the measure of the slump alone does not ensure the stability of concrete barriers on site. A range of variation of a yield stress (t0) was determined for which the concrete was extrudable and stable. This reduced the number of tests on site and therefore minimised economic costs. The second objective was to utilise local mineral admixtures with the aim of improving concrete properties and reducing environmental impacts and costs. Furthermore, the hardened concrete properties were tested for compressive strength, durability and shrinkage. The results indicated that the mineral admixtures improved the concrete compressive strength and lead to good durability while minimising shrinkage. This increased road user safety by providing high quality and reliable barriers. In conclusion, it is possible to successfully formulate an extrudable concrete in the laboratory from rheological parameters. The inclusion of mineral admixture has proven to be very beneficial.
Organisational Safety Climate, Professional Driver Behaviours, and Crashes Among a Mixed Group of Professional Drivers
Authors: Yilmaz Şerife , Özkan Türker , Öz Bahar
Published: May 2022

The current study compared different driver groups and investigated the relationship between safety climate, driver behaviours, and crashes in a mixed group of professional drivers in Turkey. Two hundred and sixty drivers completed the scales developed explicitly for professional drivers, Transportation Companies’ Climate Scale and Occupational Driver Behaviour Questionnaire, along with the demographic form. Freight drivers scored higher on risky driver behaviours than passenger vehicle drivers. Organisational safety climate predicted driver behaviours. When the organisations are more sensitive regarding work and time pressure issues (low level of pressure), drivers are less likely to speed, violate the rules, and get tired. Additionally, risky driver behaviours were related to more crashes. Specifically, driving while tired positively predicted crashes after controlling for the effects of age and annual mileage. Altogether, a favourable safety climate predicted safer driving behaviours, which was found to be related to fewer crashes. The results were discussed in detail.
Characterization and spatial variation of the deep-sea fish assemblages on Pioneer Bank, Northwestern Hawaiian Islands
Authors: Mejía-Mercado BE , Baco AR
Published: May 2022

Knowledge of the spatial variation of deep-sea fish assemblages is a critical gap in understanding seamount ecology. Pioneer Bank in the Papahānaumokuākea Marine National Monument (Hawaii, USA) has a history of hook-and-line fishing but not trawling; thus, it is a good location to further describe deep-sea fish assemblages. From replicated autonomous underwater vehicle transects at 300, 450, and 600 m on 3 sides of Pioneer Bank, we observed 4190 fish representing 81 species. Fish assemblages were dominated by Gadiformes, Perciformes, and Stomiiformes. The relative abundance of fish was significantly different among sides of the seamount and the interaction of side and depth, with the NW side having the highest relative abundance at 450 m. Species richness, rarefaction estimates of expected species richness, Shannon diversity, and Simpson dominance showed significant differences by side, but not by depth. These differences were between the S and NW sides, with the S side having the lowest diversity and high dominance. The structure of the fish assemblage was significantly different among both sides and depths, with depth as the most important factor. Fish assemblage structure was most strongly correlated with salinity, % rugosity, chlorophylla, and mean direction of substrate. These scales of spatial variability both with depth and across short horizontal distances on a single seamount are similar to those found on nearby Necker Island, which reaffirms the spatial heterogeneity in deep-sea fish assemblages on seamounts. This study provides an ecological baseline for the management and conservation of seamounts.
Fatigue, Schedules, Sleep, and Sleepiness in U.S. Commercial Pilots During COVID-19
Authors: Hilditch Cassie J. , Flynn-Evans Erin E.
Published: May 2022

INTRODUCTION: COVID-19 has had a significant impact on the aviation industry. While reduced flying capacity may intuitively translate to reduced fatigue risk by way of fewer flights and duty hours, the actual impact of the pandemic on pilot fatigue is unknown.

METHODS: We surveyed U.S. commercial airline pilots in late 2020 (N = 669) and early 2021 (N = 156) to assess the impact of COVID-19 on schedules and fatigue during the pandemic.

RESULTS: Overall, pilots reported reduced flight and duty hours compared to prepandemic. Average sleep on workdays was slightly shorter in late 2020 (6.87 ± 1.14 h) and recovered to prepandemic levels in early 2021 (6.95 ± 1.11 h). Similarly, the frequency of sleepiness on days off and in-flight increased in late 2020, with 54% of pilots reporting an increase in in-flight sleepiness, then returned to prepandemic levels in early 2021. The use of in-flight sleepiness countermeasures remained the same across assessed time points. Pilots highlighted several factors which impacted their sleep and job performance, including limited access to nutritional food during duty days and layovers, reduced access to exercise facilities during layovers, increased stress due to job insecurity and health concerns, increased distractions and workload, and changes to scheduling.

DISCUSSION: Despite a reduction in flights and duty days, COVID-19 led to increased sleepiness on days off and in flight, potentially due to the negative impact of lack of access to essential needs and heightened stress on sleep. Operators need to monitor the change in these COVID-19 related risks as the industry returns to full service.

Hilditch CJ, Flynn-Evans EE. Fatigue, schedules, sleep, and sleepiness in U.S. commercial pilots during COVID-19. Aerosp Med Hum Perform. 2022; 93(5):433–441.
Modeling the Jump-like Diffusion Motion of a Brownian Motor by a Game- Theory Approach: Deterministic and Stochastic Models
Authors: Terets A. D. , Korochkova T. Ye. , Mashira V. A. , Rozenbaum V. M. , Shapochkina I. V. , Trakhtenberg L. I.
Published: May 2022

Methods of paradoxical games are used to construct a stochastic hopping model of Brownian ratchets which extends the well-known analogous deterministic model. The dependencies of the average displacements of a Brownian particle in a stochastic ratchet system on a discrete time parameter are calculated, as well as the dependencies of the average ratchet velocity on the average lifetimes of the states of the governing dichotomous process. The results obtained are compared with both the results of modeling a similar deterministic model and the results of a known analytic description. While for the hopping analogue of the deterministic on-off ratchet, the time dependence of the displacement contains periodically repeated hopping changes when the potential is switched on and plateau of the diffusion stage of the motion when it is switched off, the stochastic dependencies, that are of an averaged character, are monotonous and do not contain jumps. It is shown that, with other things being equal, the difference in the results for the hopping ratchet model driven by the stochastic and deterministic dichotomous process of switching the potential profiles (game selection) is more pronounced at short lifetimes of the dichotomous states and vanishes with their increase.
DFT Simulation of Cortisone-Fullerenol Agents in the Therapy of Oncological Diseases
Authors: Dikusar E. A. , Pushkarchuk A. L. , Bezyazychnaya T. V. , Akishina E. A. , Potkin V. I. , Soldatov A. G. , Kutsen S. A. , Stepin S. G. , Nizovtsev A. P. , Kilin S. Ya. , Babichev L. F.
Published: May 2022

In order to therapeutically destroy oncological neoplasms chemotherapy or radiotherapy is usually applied, and in isotope medicine short-lived radionuclides are injected into the tumor (59Fe, 90Y, 95Zr, 99mTc, 106Ru, 114mIn, 147;148;155Eu, 170Tm, 188Re, 210Po, 222Rn, 230U, 237Pu, 240;241Cm, 253Es). Binary (or neutron-capture) is a technology developed for a selective effect on malignant neoplasms and using drugs tropic to tumors containing nonradioactive nuclides (10B, 113Cd, 157Gd etc.). Triadic is the sequential introduction into the body of a combination of two or more separately inactive and harmless components, tropic to tumor tissues and capable of selectively accumulating in them or entering into chemical interaction with each other and destroying tumor neoplasms under the influence of certain sensitizing external influences. The aim of this work is quantum-chemical simulation of the electronic structure and analysis of the thermodynamic stability of new cortisone-fullerenol agents for the treatment of tumor neoplasms. The need for preliminary studies of modeling such objects is due to the very high labor intensity, cost and complexity of their practical production.
DFT Simulation of Geometry and Electronic Structure of Fullerenol - Cisplatin Conjugate as Agent of Cancer Therapy
Authors: Pushkarchuk A. L. , Bezyazychnaya T. V. , Potkin V. I. , Dikusar E. A. , Soldatov A. G. , Kilin S. Ya. , Nizovtsev A. P. , Kutsen S. A. , Pushkarchuk V. A. , Ludewig Michels Dominik , Lyakhov Dmitry , Kulchitsky V. A.
Published: May 2022

Fully optimized structures of the fullerenol (Fl=C60(OH)24) - cisplatin conjugate (Fl + Cis) were obtained using the DFT simulation. The DFT/B3LYP/SV/Lanl2DZ level of theory has been used. From the results of calculation of the structural parameters, it can be concluded, that the interaction of Fl with Cis in vacuum leads to the increase of the Pt-N bond length compared to the result for Cis and decrease of the Pt-Cl bond length. The solvation effect for the Fl + Cis complex leads to the decrease of the Pt-N bond length compared to the result for vacuum and increase of the Pt-Cl bond length compared to the result for vacuum and increase of the Pt-Cl bond length compared to the result for vacuum. From the results of the calculation of structural parameters for the Fl with Cis conjugate, it can be concluded that the Pt-N bond in the aqueous solution is enhanced while the Pt-Cl bond is weakened, which can affect the biological activity of the Cis in this complex. The influence of the localization of HOMO and LUMO orbitals on the biological activity of the conjugate under consideration was analyzed. The paper presents the results of DFT simulation of the atomic and electronic structure of water-soluble cisplatin conjugate derivatives and nanocarbon structures, such as fullerenol Fl, as well as the results of studying the possible mechanisms of their biological activity.
Okul Sporlarına Katılan Ortaokul Öğrencilerinin Duygusal Zeka Düzeyleri
Authors: ALPER Rumeysa , ÖZCAN Gülsen
Published: May 2022

Amaç: Bu araştırma okul sporlarına katılan ortaokul öğrencilerinin duygusal zeka düzeylerinin incelenmesi amacıyla yapılmıştır.

Gereç ve Yöntemler: Araştırmanın örneklemini Bolu Merkez İlçe’ deki ortaokullarda öğrenim gören ve okul sporlarında yer alan 543 ortaokul öğrencisi oluşturmaktadır. Verileri elde etmek amacıyla Bar - On Duygusal Zeka Ölçeği Çocuk ve Ergen Formu (EQi:YV) kullanılmış ve Bolu Merkez İlçe’ de yer alan sekiz ortaokuldaki öğrencilere uygulanmıştır. Bar - On Duygusal Zeka Ölçeği Çocuk ve Ergen Formu Reuven Bar-On ve James D.A. Parker (2000) tarafından 7-18 yaş arasındaki gençlerin duygusal zeka seviyelerini ölçmek için geliştirilmiş ve Köksal (2007) tarafından Türkçeye uyarlanmıştır.

Bulgular: Bu araştırmanın sonucunda spor türüne, spor branşına ve kardeş sayısına göre istatistiksel olarak anlamlı farka rastlanmamıştır (p>0,05). Bu sonuca ek olarak bireylerarası alt boyutunda kız öğrencilerin lehine ve olumlu etki alt boyutunda ise erkek öğrencilerin lehine anlamlı fark olduğu anlaşılmıştır (p
Travma Sonucunda Kırılan Üst Santral Dişin Kırık Parça Kullanılarak Restorasyonu: Olgu Sunumu (Reataçman Tekniği: Olgu Sunumu)
Authors: YALNIZ Alperen Murat , BAĞIŞ Yıldırım Hakan
Published: May 2022

Travma nedeniyle etkilenen anterior dişlerde oluşan kırıklar; ağrı, fonksiyon kaybı, estetik ve psikolojik sorunlara yol açabilir. Anterior dişlerde görülen kırıkların restorasyonlarında, doğal diş form, fonksiyon ve optik özelliklerini geri kazandırmak önemlidir. Bu olgu raporunda, travma sonucu gerçekleşmiş kron kırığında uygulanan tedavi yaklaşımı sunulmuştur. On üç yaşındaki erkek hasta sağ üst santral dişinde 1 hafta önce meydana gelen travma sonucu oluşan kırık şikâyeti ile kliniğimize başvurdu. Hasta şehir dışında olduğundan geçen sürede kırık parça suda bekletildi. Kırık parçanın yerine uygunluğu kontrol edildi. Herhangi bir preparasyon yapmadan hem diş hem de kırık parça da total-etch adeziv teknik kullanıldı. Diş rengine uygun seçilen kompozit rezin dişe ve kırık parçaya uygulanarak kırık parça yerine yerleştirildi. Travma sonucu kırılmış dişler kendi kırık parçaları kullanılarak; doğal diş yapısını bozmadan estetik ve fonksiyonel şekilde başarıyla restore edilebilirler.
Aşı Karşıtlığı; Özerkliğin Kötüye Kullanımı
Authors: ARBAK Peri Meram
Published: May 2022

Aşılar önlenebilir ve bulaşıcı hastalıklardan korunmakta en önemli araçlardan biridir. Aşı karşıtlığı ise aşılanma hızlarını azaltmakta ve bulaşıcı hastalıklardan ölümü artırmaktadır. Aşı karşıtlığının altında yatan nedenler; aşının yan etkilerinden korkma, aşıya ilişkin önyargılar, sağlık eğitiminin eksikliğidir. Zorunlu aşı kampanyaları genel toplumun iyilik ve sağlıklılık sonucuna ulaşmak için etkili şekilde uygulanan halk sağlığı uygulamalarıdır. Aşılanma yoluyla hem bireysel hem de toplumsal bağışıklık sağlanmaktadır. Böylece hastalığın bulaşması da azalmaktadır. Aşı karşıtlığı, aşılama yoluyla sağlanacak toplumsal bağışıklığı engelleyeceği için genel toplumun sağlığını kötü şekilde etkilemektedir. Aşı karşıtlığı biyoetik perspektifle bakıldığında hem bireysel hem de toplumsal bağışıklığın engellenmesiyle yararlılık kavramına ters düşmektedir. Aşı karşıtlığı 20. yüzyılın başından bu yana gözlenmiştir ve aşı karşıtları kendi bedenleriyle ilgili kararların kendilerine ait olduğu söylemini kullanmışlardır. Biyoetik perspektifte özerklik kavramı, kişinin özgür iradesiyle, dış baskı olmaksızın kendi kararlarını alabilmesidir. Ancak salgın hastalıklar ve afet durumlarında genel toplumun yararı kişinin özerk tutumunun önüne geçmektedir. Sonuçta bireysel özerkliğin aşı karşıtlığı şeklinde ortaya çıkması hem toplum sağlığını, hem de bireyin sağlığını tehdit altına sokmaktadır.
Toll Benzeri Reseptörler’in Periodontal Hastalık Patogenezindeki Rolü
Authors: AKGÜL Zeynep , GÜNPINAR Şadiye
Published: May 2022

Bağışıklık sistemi, doğal ve edinilmiş olmak üzere iki ana bölümden meydana gelir. Doğal bağışıklık sistemi, deri ve mukozal epitelyal bariyerler ile humoral ve hücresel elemanlardan oluşur. İlave olarak, konağın kendine yabancı olan patojenle ilgili molekülleri tanıması ve böylece bağışıklık yanıtın oluşturulmasını sağlayan çeşitli reseptörlere sahiptir. Bu reseptörlerden en iyi bilineni toll benzeri reseptör (TBR) ailesidir. Periodonsiyumun önemli bir savunma bileşeni olan dişeti epitel hücreleri oral mikroorganizmalar ile sürekli temas halindedir. Bu durum, dişeti epitelinde bulunan TBR'lerin sürekli olarak uyarılması ve devamında, ağız sağlığının korunmasına yardımcı olan sitokinlerin ve defensinlerin üretilmesi ile sonuçlanır. Diğer taraftan, konak ve mikroorganizma arasındaki bu dengenin mikroorganizma lehine bozulması sonucu periodontal dokulardaki hastalığın ilerlemesi artar. Bu derlemenin amacı doğal bağışıklık sistemin önemli elemanlarından biri olan TBR’lerin özelliklerini, sinyal iletimini, periodontal hastalıktaki rolünü ve epigenetik düzenlenmesini güncel yayınlar ışığında değerlendirmektir.
Metabolik Sendromda Tıbbi Beslenme Tedavisi
Authors: HIZLI GÜLDEMİR Hilal
Published: May 2022

Günümüzde sıklıkla karşılaşılan bir endokrin bozukluk olan metabolik sendrom (MetS), bozulmuş insülin direnci, adipoz dokuda artış (abdominal obezite, dislipidemi), hipertansiyon, koroner arter hastalığı, artmış sistematik inflamasyon gibi sistemik bozukluklarının tümünü birlikte kapsayan bir tablodur. Görülme sıklığı, dünyada ve ülkemizde giderek artan bu önemli halk sağlığı sorununda, tanı alan bireylerde sağlıklı beslenme ve yaşam biçimi ile pozitif yönde iyileşmeler sağlanabilmektedir. Genetik ve çevresel faktörlerin etkisiyle ortaya çıkan bir hastalık tablosu olan metabolik sendromda öncelikli tedavi, yaşam biçiminin sağlığı geliştirici şekilde düzenlenmesi olmalıdır. Sağlıklı beslenme önerileri arasında özellikle doymuş yağ alımının azaltılması, doymamış yağ alımının arttırılmasının yanı sıra kompleks karbonhidrattan zengin beslenmek, posa alımını arttırmak, bitkisel sterol ve/veya stanollere beslenmede yer vermek, tuz tüketimini sınırlandırmak gibi Akdeniz beslenme modeline uygun öneriler ön plana çıkmaktadır. Ayrıca diyetin glisemik indeks ve yükü, metabolik sendromun beslenme tedavisinde dikkate alınması gereken özelliklerdir. Düşük dansiteli lipoprotein düzeyi yüksekliğini düşürmeye yardımcı beslenme önerileri de mutlaka göz önünde bulundurulmalıdır.
Fertiliteyi Geliştirmede Yenilikçi Bir Yöntem: Fertilite Yogası
Authors: ALUŞ TOKAT Merlinda , ÖZÖZTÜRK Sevcan
Published: May 2022

Fertilite yogası, fertiliteyi geliştirmeyi ve rahatlamayı destekleyen yoganın bir türüdür. Diğer yoga türleri gibi, vücudun iç dengesini sürdürmeye, düzgün ve en iyi şekilde çalışmasına yardımcı olmaktadır. Fertilite yogası, fertiliteyi olumsuz etkileyen stresi azaltmak için asanalar, pranayama (nefes) ve meditasyonu içermektedir. Fertilite yogasının diğer yogalardan en temel farkı pelvik bölgeye giden kan akımını artıran hareketlere odaklanmasıdır. Diğer bir farkı, fiziksel bedenimizi ve enerjimizi yöneten çakralara, özellikle sakral çakra’ya temellendirilmesidir. Sakral çakra fertilite yogasında aktif tutulması gereken çakradır.

Fertilite yogası, fertilite yogası eğitmeni eşliğinde veya danışmanlığında bireylerin kendi kendine uygulayabileceği bir pratiktir. Ancak, fertilite sorunu olan bireyler gebe kalabilme şansını artıracağı düşüncesiyle özellikle tedavi sürecinde fiziksel hareketlerini kısıtlamaktadır. Sağlık profesyonelleri tarafından fertilite yogası gibi fiziksel hareket, pelvik bölgeye taze oksijenlenmiş kan akımını artıran ve ruhsal rahatlama içeren uygulamaların yararları hakkında çiftlerin farkındalıkları artırılabilir. Bu makalenin amacı fertiliteye özgü fertilite yogasının kadın ve erkek fertilitesine etkisini açıklamak ve sağlık profesyonelleri için örnek bir program sunmaktır.
Experimental and Numerical Investigation of Jet Velocity Effects on Parallel Jet Combustor Characteristics of Hydrogen Enriched Fuel
Authors:   Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Liu Zhigang ,   University of Chinese Academy of Sciences, Xiong Yan ,   Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences; University of Chinese Academy of Sciences, Zhang Zhedian ,   Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences; University of Chinese Academy of Sciences
Published: May 2022

Adding hydrogen into natural gas fueled for gas turbines is a feasible strategy for reducing carbon emissions. Moderate or Intense Low Oxygen Dilution (MILD) combustion has potential to solve the problem of high NOx emissions. In this paper, the effects of jet velocity on the characteristics of parallel jet combustor were studied through experimental investigations and numerical simulations. The fuel consisted of 50 % methane and 50 % hydrogen by volume. The jet velocity ranged from 90 m/s to 150 m/s. Based on a simplified chemical reactor network model, the threshold recirculation ratio for MILD combustion of hydrogen enriched fuel under different adiabatic flame temperatures was calculated according to the experimental conditions. When the equivalent ratio is less than 0.6, the threshold recirculation ratio decreases with the increase in the hydrogen fraction. The experimental results show that NOx emissions decrease slightly, and CO emissions and the lift-off height of reaction zone increase as the jet velocity increases. When the nozzle jet velocity changes from 90 m/s to 150 m/s, the numerical simulation results show that the proportion of flue gas recirculation in the parallel jet combustor remains unchanged. However, the region with Da＞1 decreases to visualise the effect of jet velocity of MILD combustion of hydrogen enriched fuel, which means that the region of slow-chemistry reaction increases. For hydrogen enriched fuel, increasing the jet velocity is conducive to establishing MILD combustion and meeting the requirement of low NOx emissions.
Post-stall behavior of 2-stage compressor
Authors:   National University of Defense Technology China Aerodynamics Research and Development Center, Wang Ziwei , Li Bin ,   China Aerodynamics Research and Development Center, Liu Junbin ,   National University of Defense Technology, Chen Jingfan ,   National University of Defense Technology, Liu Yao ,   China Aerodynamics Research and Development Center
Published: May 2022

Rotating stall in the high speed compressor can lead to violent disruption of flow, damage to the blade structures and, eventually, engine shutdown. To investigate the mechanism of stall inception and stall propagation in multi-stage compressor, the onset and transient behavior of rotating stall in a transonic 2-stage compressor are simulated with full-annulus unsteady method, based on the in-house software ASPAC. The choked throttle model is adopted. The results indicate that, in the 2-stage compressor, stall cells exist in rotors of both compressor stages, which propagate at 43% and 25% of the shaft rotational speed respectively. Meanwhile, the rotating stall disturbance can be suppressed by stator of the first stage, which will weaken the influence of rotating stall on the compressor stage downstream.
Influence Of Fan Rotor Leading Edge Erosion On The Flow Characteristics Of The Compression System
Authors:   Civil Aviation University of China, Huang Chenlei , Shi Lei ,   Civil Aviation University of China, Wu Wenbo ,   Civil Aviation University of China, Yu Peng ,   Civil Aviation University of China, Ma Long ,   Civil Aviation University of China, Jiang Qi ,   Xiamen Air
Published: May 2022

During the operation of an aero-engine, the leading edge of the fan rotor blade is eroded by airflow, resulting in changes in the blade leading edge morphology, which in turn affects the overall aerodynamic level of the compression system. Based on the study of the degradation of fan rotor aerodynamic characteristics by leading edge erosion, the study was extended to the whole compression system. This paper uses numerical simulation to calculate the flow characteristics of the compression system for the original blade and fan rotor leading edge roughness Rs=120μm, and analyzes the aerodynamic performance at the design speed. In the bypass duct near the stall point, The isentropic efficiency of the eroded blade is 2.082% lower compared to that of the original blade, and the pressure ratio is 0.34% lower compared to that of the original blade, but the leading edge erosion of the fan blade has relatively little effect on the core duct.
Propeller Design and Performance Evaluation with Partially Prescribed Velocity Distribution
Authors:   Institute of Jet Propulsion and Turbomachinery Technische Universität Braunschweig, Lück Sebastian , Göing Jan ,   Institute of Jet Propulsion and Turbomachinery Technische Universität Braunschweig, Wittmann Tim ,   Institute of Jet Propulsion and Turbomachinery Technische Universität Braunschweig, Kirsch Bastian ,   Institute of Jet Propulsion and Turbomachinery Technische Universität Braunschweig, Benjamin Leroy ,   Institute of Jet Propulsion and Turbomachinery Technische Universität Braunschweig, Friedrichs Jens ,   Institute of Jet Propulsion and Turbomachinery Technische Universität Braunschweig
Published: May 2022

This research aims to provide an iterative propeller design approach for distributed electric propulsion (eDEP) systems with the example of improved cooling characteristics. This is achieved due to increased outflow velocity near the hub where a heat exchanger is placed. For this purpose, the in-house tool RAPID (Research Algorithm for Propeller Identification and Design) is presented. Its propeller design algorithm is based on the Blade Element Momentum Theory with Betz’ optimal displacement velocity ratio. Patterson’s approach for prescribed axial velocities is used for the modified cooling characteristics. The propeller design with modified near-root velocity distribution is presented for an eDEP propulsion unit of a 50 pax regional aircraft class. In the following, the on- and off-design performance of the design is shown. Subsequently, the improved cooling performance is discussed by applying an analytical fin heat exchanger model in the propeller outflow. It can be shown that the modifications result in a significant reduction in the required heat exchanger size of up to 3.86%. At the same time, the impact on propeller efficiency remains below 0.44% at take-off while it increases up to -2.41% at cruise.
Study Of Atomization Model Of Prefilming Atomizer Considering Mass And Heat Transfer Processes
Authors:   Yangtze River Delta Research Institute of NPU, Northwestern Polytechnical University + Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, Zhao Jingyun , Chen Fuzhen ,   Yangtze River Delta Research Institute of NPU, Northwestern Polytechnical University + Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, Yan* Hong ,   Yangtze River Delta Research Institute of NPU, Northwestern Polytechnical University + Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine
Published: May 2022

Liquid film propagation and breakup in the prefilming atomizer is controlled by two instabilities, one is the Kelvin- Helmholtz (KH) instability leading to the formation of longitudinal waves, and the other is the Rayleigh-Taylor (RT) instability causing the liquid film to break into droplets. At present, most of the atomization models of prefilming atomizers are established without considering the effect of the heat and mass transfer processes between the high-temperature gas and liquid film. The current study for the first time explores this effect on the change of KH and RT instabilities and film propagation and breakup processes, and implements this effect into the atomization model. Results show that the mass and heat transfer processes promote the development of KH instability and have an inhibitory effect on the development of RT instability. Furthermore, the most amplified wavelength of transverse waves caused by RT instability is used to characterize the Sauter mean diameter (SMD) and droplet size distribution of the droplets. The droplet SMD of the primary breakup decreases linearly with the increase of temperature, but the uniformity of the droplets deteriorates. This newly developed atomization model can be used to predict the size and distribution of droplets more accurately.
Use of Hibiscus sabdariffa Calyxes in Meat Products
Authors: Santos Eva María , Sánchez-Ortega Irais , Lorenzo Jose M. , Domínguez Rubén , Munekata Paulo E. S. , Falfán-Cortés Reyna Nallely , Ibarra Israel S. , Rangel-Vargas Esmeralda
Published: May 2022

In the search for new ingredients that counteract some of the problems associated with the consumption of meat and meat products like high contents of saturated fat, salt, cholesterol, the absence of dietary fiber, and the presence of synthetic additives, Hibiscus sabdariffa calyxes have shown good colorant, antimicrobial, and antioxidant properties. This research paper studies the use of H. sabdariffa roselle calyxes directly or by means of extracts in meat and meat products. Although its application is incipient, the results are promising. The vibrant red color of the calyxes makes calyxes suitable for their use in meat products even though the concentration must be optimized since the acid taste can detract from the overall acceptance. The antimicrobial properties contribute to safer meat products, and antioxidant effects, helping to extend the shelf life of meat products and reducing oxidative processes. Nonetheless, achieving the desired effects is still challenging since several factors can affect these functional properties.