bluuebunny/crossref_metadata_2025 huggingface dataset:
Pleural Mesothelioma: Unexpected Finding in a Young Man
Authors: Ullah Raza , Khan Imranullah , Naz Shahida , Ahmad Aamir , Haleema
Published: September 2022

Pleural mesothelioma is the disease of the elderly, usually in the seventh decade of life. Asbestos exposure is the most common finding among these patients. Other causes include a simian virus, radiation exposure, genetic predisposition and erionite. Common symptoms include shortness of breath, weight loss, dull achy chest pain on the site of the lesion and anorexia. Pleural effusion is common and video-assisted thoracoscopic (VATS) biopsy is the investigation of choice. pleurectomy, pleuro-pneumonectomy and cisplatin-based therapy are management modalities depending upon the stage of the disease. We are presenting an unusual case of pleural mesothelioma in a young patient with no significant exposure to the causative agent.
Management transformation Innovative activity based on the formation of local innovation systems
Authors:   Admiral S.O. Makarov State University of Marine and River Fleet, Asaul M.A. , Zaitsev N.S. ,   Academy of Certification and Advanced Training of Specialists
Published: September 2022

Based on the results of the analysis of the national and regional innovation systems of the Russian Federation, key directions for the transformation of the innovation management system are proposed. The concept of updating integration processes in the innovation environment and the form of its practical implementation – the local innovation system is proposed, and a graphical model of interaction of subjects of innovation activity in the local innovation system is presented. The main stages of the methodology of comparative express analysis of the effectiveness of the functioning of innovative systems are described.
Technological Transition: Economic Crisis, Sanctions and a New Technological Agenda
Authors:   Institute of Economics of the Russian Academy of Sciences, Gorodetsky A.E.
Published: September 2022

The relationship between the concepts of transformational transition and the role of technological transition as its most important component, the content of the category of technological transition and technological sovereignty, as characteristics of technological development in the Transitional era of changing the world order, an acute global economic and geopolitical crisis, sanctions and hybrid wars. The necessity and expediency of economic mobilization are substantiated, the modernized agenda of technological development is analyzed, and an approach to analyzing the risks of digitalization is proposed.
Üniversite Öğrencilerinin Fanatizm Düzeyleri İle Marka Tercihleri Arasındaki İlişkinin İncelenmesi
Authors: BAHÇE Alper , TURAN Mehmet Behzat
Published: September 2022

Bu çalışma üniversitede öğrenim gören öğrencilerin fanatizm düzeyleri ile marka tercihleri arasındaki ilişkiyi incelemek amacıyla gerçekleştirilmiştir. Bu doğrultuda; çalışma grubuna, Kayseri ilinde bulunan Erciyes Üniversitesi ve Kayseri Üniversitesi’nden rastgele seçilmiş ve farklı bölümlerde eğitimlerini sürdüren 696 öğrenci gönüllü olarak katılım göstermiştir. Araştırmada veri toplama aracı olarak; fanatizm düzeylerine yönelik verileri elde etmek için Taşmektepligil, Çankaya ve Tunç (2014) tarafından geliştirilen “Futbol Taraftarı Fanatiklik Ölçeği”, marka sadakatine yönelik verileri elde etmek için ise; Tekin (2020) tarafından geliştirilen “Marka Sadakati” ölçeği ayrıca araştırmacı tarafından oluşturulan “Kişisel Bilgi Formu” kullanılmıştır. Ölçeklerden elde edilen veriler SPSS paket programı ile analiz edilmiştir. Katılımcılara ait kişisel bilgiler ve envanter toplam puanları ve faktör puanları frekans (f) ve yüzde (%) değerleri tespit edilerek verilmiştir. Verilerin normallik dağılımları çarpıklık basıklık testleri ve Kolmogrov Smirnov Testi ile sınanmıştır. Verilerin, iki değişken arasında karşılaştırılmasında t testi, üç veya daha fazla değişkenin karşılaştırılmasında ise anova testi uygulanmıştır. Ölçeklerden elde edilen puanlar arasındaki ilişkiyi gösterebilmek için Pearson Momentler Çarpımı Korelasyon analizi (r) kullanılmıştır. Araştırma bulguları incelendiğinde, öğrencilerin fanatiklik düzeyleri ile marka sadakati arasında pozitif yönde anlamlı bir ilişki bulunmuştur. Özellikle fanatiklik anlamında kurumsal aidiyeti yüksek öğrencilerin takımla özdeşleşme konusunda pozitif uyum içerisinde oldukları görülmüştür. Sonuç olarak araştırma neticesinde ortaya çıkan verilere göre, futbol taraftarı fanatikliği ile marka sadakati arasında bütün alt boyutlarda pozitif bir ilişki görülmektedir. Futbol taraftarlarının kurumsal aidiyetleri ile takımla özdeşleşme durumları arasında yüksek derecede pozitif bir ilişki ortaya çıkmıştır. Takıma aidiyet duygusu besleyen taraftarların takımlarıyla daha çok bütünleştikleri ve bu duruma paralel olarak destekledikleri kulüplere katkı sağlayabilmek adına satın alma düşüncelerinde de pozitif yönde bir artış olduğu düşünülmektedir.
A Study on Discrimination based on Gender in Parental Leave: The Relevance of the Proportionality Test to the ECtHR's Jurisprudence on Gender-Based Unequal Treatment and the Prohibition of Discrimination under Article 14 ECHR
Authors:   Center for Public Interest & Human Rights Law Chonnam National University, Jun Hyungjoon
Published: September 2022

The principle of the proportionality represents a general principle of law. Its main aim is to protect the citizen from arbitrary and improper state action and in this respect it acts as a standard of justification for interventions by the authorities. Even if this principle is not explicitly standardized in most national constitutions of the Member States of the EU or in the ECHR, it is derived from the principles of democracy and the rule of law and is generally recognized in the law of the ECHR. The levels of the proportionality are first divided according to the legitimate aim of the legally relevant measure, then to its suitability for achieving the aim, followed by its necessity and finally the proportionality test in the narrow sense, the appropriateness of the measure. The prerequisite for the scope of application of Art. 14 of the ECHR is that persons in comparable or legally similar situations have been treated differently. The list of possible grounds for discrimination in Art. 14 of the ECHR is by no means exhaustive, but merely exemplary. Art. 14 of the ECHR also applies when states have granted rights beyond their obligations under the Convention, which fall within the scope of an article of the Convention. According to the ECtHR, unequal treatment according to the criteria just listed constitutes discrimination in the sense of a violation of Art. 14of the ECHR if it lacks an objective and reasonable justification. The principle of gender equality and the related prohibition of discrimination under Article 14 of the ECHR is too important in a pluralistic and tolerant European society to justify its violation merely by referring to the margin of appreciation of the member states. In order to achieve results in line with interests in the future, the case law of the ECtHR can build on the argumentation structure in the case of Konstantin Markin v. Russia. The only aspect requiring improvement is the control density of appropriateness and necessity, which should be taken seriously.
Online Multicomponent Program for Mental Health Promotion of Medical Students: An Intervention Study
Authors: AboZayed Amany , Elsalamony Omaima Kamel , ElKholy Monira , Enaba Dalia Ahmed , Yousof Hanaa Zaghloul
Published: September 2022

Background: Youth mental health is a significant public health concern. Mental health issues are increasing in severity and number in college campuses. Improving adolescent mental well-being remains a challenge for most societies.
Aim: Promote the well-being and mental health outcomes of Kasr Al-Ainy medical school students.
Methods: An intervention study conducted at Kasr Al-Ainy Faculty of medicine. Study Participants (n=664) from 4th and 5th graders were assigned to either of two conditions: Fourth graders (n=325) to intervention (Horizon Egypt) website which provided information across positive psychology domains and Fifth graders (n=312) to control neutral entertainment-based website. Participants were assessed pre- and post-intervention on Depression Anxiety Stress Scale-Short form (DASS-21) and the Warwick-Edinburgh Mental Well-Being Scale (WEMWBS).
Results: There was no pre-intervention statistically significant differences between Horizon Egypt and control group on demographic variables, DASS-21, or WEMWBS scores. Qualitative data indicated that all participants reported that Horizon Egypt website was easy to use, 85% agreed the program was fun, 91% agreed the activities were interesting and 77% agreed they would continue to use it after study completion. Compared to the control condition, participants in the Horizon Egypt condition with high levels of adherence reported significant decrease in depression, anxiety, stress and improvements in well-being score.
Conclusion & Recommendations: Acceptability of Horizon Egypt website was high. The online delivery of positive psychology programs may be an alternative way to address mental health issues and improve youth well-being.
Ramadan Fasting and its Health Benefits: What’s New?
Authors: Rahman Shahrul
Published: September 2022

Fasting is one of the five pillars of Islam. Fasting entails more than abstaining from food and drink, fasting improves impulse control and aids in the development of good behavior. The holy month of Ramadan falls on the 9th month of the lunar calendar. Ramadan is a month-long fasting period that takes place between dawn and sunset. Some people with diabetes and those who are sick or have certain medical conditions may be exempt. The majority of people with diabetes, on the other hand, choose to fast; even against medical advice. Many studies have been conducted to determine the health benefits of fasting. Apart from the benefits to the body’s organs, Ramadan fasting is also beneficial for the growth of the gut microbiota and gene expression and is believed to impact the body’s autophagy process. Furthermore, Ramadan fasting has an impact on mental health; TC and LDL were lower, while HDL and TG were higher, lowers inflammation, and oxidative stress markers.
Use of a mHealth Approach for the Training of Health-care Providers on Nutrition Counseling in a Malnutrition Clinic
Authors: Shawky Maissa , Salem Marwa Rashad , Abouhashima Fatma , Abdelaziz Shaimaa , Aguizy Fayrouz Hamed E.
Published: September 2022

BACKGROUND: The use of mobile phones as job aides is one of the most innovative mHealth applications for community health professionals. However, few studies indicated an influence of mHealth on clinical outcomes in low-income countries.

AIM: Therefore, the researchers conducted the present study to assess the impact of providing updated training packages using mobile technology to service providers on the knowledge of children’s caregivers and the quality of performance of service providers.

METHODS: A quasi-experimental pre-posttest of separate samples was conducted in a malnutrition clinic. The total sample size was 400 cases (200 caregivers as a pre-intervention group [pre-IG] and 200 caregivers as a post-intervention group [post-IG]), with inclusion criteria of having their children 6–24 months old. The study interventions composed of five activities: Orientation sessions on nutrition counseling for physicians and nurses, a software (e-health) program loaded in e-tablet to be used during nutrition counseling by physicians, a booklet on proper infant and child feeding, conducting on-the-job training for the nurses, and establishing counseling cycle in the clinic.

RESULTS: After the study intervention, the total knowledge score for all items of children’s nutrition increased from 39% among pre-IG to be 80% among post-IG. The majority (more than 90%) of post-IG received four services packages.

CONCLUSION: Participation of service providers in five articulating interventions for nutrition counseling contributes to improving the knowledge of children’s caregivers. Practice Implications: Using mobile technology improved the quality of nutrition care services delivered in the malnutrition clinic.
The FloRes Database: A floral resources trait database for pollinator habitat-assessment generated by a multistep workflow
Authors: Baden-Böhm Franziska , App Mario , Thiele Jan
Published: September 2022

The decline of pollinating insects in agricultural landscapes proceeds due to intensive land use and the associated loss of habitat and food sources. The feeding of those insects depends on the spatial and temporal distribution of nectar and pollen as food resource. Hence, to protect insect biodiversity, a spatio-temporal assessment of food quantity of their habitats is necessary. Therefore, sufficient data on traits of floral resources are required.

As floral resources’ traits of plants are important to quantify food availability, we present two databases, the FloRes Database (Floral Resources Database) and the raw database, from where FloRes was derived. Both databases contain the plant traits: (1) flowering period, (2) floral-unit density per day, (3) nectar volume per floral unit per day, (4) sugar content per floral unit, (5) sugar concentration in nectar, (6) pollen mass or volume per floral unit and per day, (7) protein content of pollen and (8) corolla depth. All traits were sampled from literature and online databases. The raw database consists of 702 specified plant species, 138 unspecified species 37 species (spec., sp), 22 species pluralis (spp) and, for 79, only the genus was identified) and two species complexes (agg.). Those 842 taxa belong to 488 genera and 102 families. Finally, only 27 taxa have a complete set of traits, too few for a sufficient assessment of spatio-temporal availability of floral food-resources.

As information on floral resources is scattered throughout many publications with different units, we also present our multistep workflow implemented in five consecutive R-scripts. The multistep workflow standardises the trait units of the raw database to comparable entities with identical units and aggregates them on a reasonable taxonomic level into the second application database, the FloRes Database. Finally, the FloRes Database contains aggregated information of traits for 42 taxa and, when corolla depth is excluded, for 72 taxa.

This is the first attempt to gather these eight traits from different literature sources into one database with a multistep workflow. The publication of the multistep workflow enables the users to extend the FloRes Database on their own demands with other literature data or newly-gathered data to improve quantification of food resources. Especially, the combination of pollen, nectar and the open flowers per square metre is, as far as we know, a novelty.

The FloRes Database can be used to evaluate the quantity of food-resource habitats available for pollinators, for example, to compare seed mixtures of agri-environmental measures, such as flower strips, considering flower phenology on a daily basis.
A new rock gecko in the Cnemaspis siamensis group (Reptilia, Gekkonidae) from Kanchanaburi Province, western Thailand
Authors: Rujirawan Attapol , Yodthong Siriporn , Ampai Natee , Termprayoon Korkhwan , Aksornneam Akrachai , Stuart Bryan L. , Aowphol Anchalee
Published: September 2022

We describe a new species of the gekkonid genus Cnemaspis from Erawan National Park in Kanchanaburi Province of western Thailand. Molecular phylogenetic analyses, based on the mitochondrial NADH dehydrogenase subunit 2 gene and flanking tRNAs, revealed that Cnemaspis auriventralissp. nov. is nested within the C. siamensis group and is closely related to C. huaseesom, but has uncorrected pairwise genetic divergences of 12.12–27.92% from all other species in the C. siamensis group. The new species is also distinguished from other species in the C. siamensis group by having the combination of snout-vent length 36.7–38.6 mm in males (N = 3), 32.9–36.9 mm in females (N = 2); eight to ten supralabials; seven to nine infralabials; ventral scales smooth; six or seven precloacal pores in males; 16–17 paravertebral tubercles linearly arranged; tubercles on the lower flanks present; lateral caudal furrows present; no caudal tubercles in the lateral furrows; ventrolateral caudal tubercles present anteriorly; caudal tubercles not encircling tail; subcaudals smooth bearing a single median row of enlarged smooth scales; two postcloacal tubercles on each side; no shield-like subtibial scales; subtibial scales smooth; no enlarged submetatarsal scales; 23–27 subdigital lamellae on the fourth toe; sexually dimorphic for dorsal and ventral colour pattern; prescapular marking absent; gular marking absent; and yellow colouration in life of all ventral surfaces of head, body and tail in adult males. The new species is currently known only from upland karst habitat at its type locality.
Learning by tablet-based drawing: Effects of verbal support among secondary-school students
Authors: Rochat Julie , Jamet Éric , Michinov Estelle
Published: September 2022

Des études récentes ont montré que les effets de la génération de schémas sur l’apprentissage dépendraient du support fourni pendant la tâche. Cette étude a examiné les effets d’un support verbal (éléments textuels à dessiner mis en gras) sur la qualité des schémas générés, l’apprentissage et la précision du monitoring. 71 élèves de cinquième ont été répartis dans trois conditions d’apprentissage : 1) illustrations fournies, 2) génération de schémas sans support verbal ou 3) avec support verbal. Les résultats ont montré que le support avait des effets positifs sur la qualité des schémas complexes et la précision du monitoring. Aucun effet de la génération avec ou sans support n’a été observé sur la compréhension ou la mémorisation des informations du texte à dessiner. De plus, dans la condition avec support verbal, l’attention des apprenants semble avoir été détournée des autres éléments du texte puisque ces derniers ont été moins bien mémorisés.
Application of Soft Directional Prismatic Contact Lenses to Correct Diplopia
Authors: Parolini Barbara , Penzani Roberta , Pascotto Patrizio
Published: September 2022

Purpose:

To verify whether diplopia due to a small-angle strabismus within 8 prism diopters (PD) could be corrected by applying soft directional prismatic contact lenses, obtaining higher comfort and quality of vision for the patients.

Methods:

A prospective study was undertaken by enrolling consecutive patients affected by vertical and/or horizontal diplopia and small-angle strabismus within 8 PD. The patients were tested for best corrected visual acuity, refraction, cover test for near and for distance, ocular motility test, prismatic fit test, corneal topography, tear film evaluation, binocular vision test, head position evaluation, retinography, and optical coherence tomography of the posterior and anterior segment. Custom soft contact lenses, made in Benz G5X material, were designed and developed for this study. All patients were first corrected with prismatic glasses according to their degree of strabismus and ametropia. Then they were asked to wear custom-made directional prismatic contact lenses with appropriate simultaneous correction of strabismus and ametropia. The patients were then asked to answer whether the comfort and quality of vision was higher with directional prismatic contact lenses or prismatic glasses.

Results:

Eight patients were enrolled with different causes of diplopia caused by a strabismus of 8 PD or less. The soft directional prismatic contact lenses could resolve diplopia in 100% of patients. All patients reported greater comfort and quality of vision with directional prismatic contact lenses.

Conclusions:

The study demonstrated that diplopia resulting from an angle of strabismus within 8 PD can be corrected through the use of soft directional prismatic contact lenses, obtaining greater quality of vision free of aberrations.

[
J Pediatr Ophthalmol Strabismus
. 2023;60(4):248–252.]
Bibliometric Analysis of the Top 100 Cited Articles in Pediatric Ophthalmology
Authors: Oydanich Marko , Schott Brian , Wagner Rudolph S. , Guo Suqin
Published: September 2022

Purpose:

To determine and analyze the 100 most cited articles in pediatric ophthalmology.

Methods:

A literature search was conducted using the ISI Web of Science database on the top 100 most cited articles in pediatric ophthalmology.

Results:

The 100 most cited articles were published between 1941 and 2018, with the greatest number published in both 2005 and 2012. A total of 29,731 citations were generated during the study period. There has been a significant increase in citations annually since 1941, with a peak number of citations in 2021 with 2,629 citations. Myopia, retinopathy of prematurity, and other forms of refractive error were the topics most studied and cited in these articles. Most of the articles were classified as either large cohort prospective/retrospective studies (34) or randomized clinical trials (19), with case reports/series being the least frequent (7).
Investigative Ophthalmology & Visual Science
(23),
JAMA Ophthalmology
(22), and
Ophthalmology
(22) published the majority of the articles. Institutions that conducted the majority of the studies presented include the National Eye Institute (10), the Ohio State University College of Optometry (9), and the Oregon Health & Science University (6).

Conclusions:

This bibliometric analysis provides a unique historical perspective of the literature in the field of pediatric ophthalmology that has not been studied before. The research in the field of pediatric ophthalmology is advancing quickly, with most articles and citations occurring within the past 15 years. The strong focus on prospective cohort studies and clinical trials reveals the importance of advancing the treatment of critical disease within the field of pediatric ophthalmology.

[
J Pediatr Ophthalmol Strabismus
. 2023;60(5):330–336.]
Predictive Accuracy of the Hill-RBF 2.0 Formula in Pediatric Eyes: Comparison of 5 Intraocular Lens Formulas
Authors: Rastogi Anju , Singiri Deepthi , Kumar Prateek , Thakar Meenakshi , Baindur Siddharth , Bhardwaj Ankita
Published: September 2022

Purpose:

To compare the predictive accuracy of the Hill-Radial Basis Function (Hill-RBF) 2.0 formula with the Barrett Universal II, Hoffer Q, SRK/T, and Holladay 1 formulas in pediatric eyes.

Methods:

In this observational study, 99 eyes of 70 children 4 to 18 years old with clinically significant congenital or developmental cataracts attending the pediatric ophthalmology clinic in Guru Nanak Eye Centre were included. Optical biometry was performed in all patients with the Lenstar LS-900 (Haag-Streit). Intraocular lens (IOL) power predicted by the Hill-RBF formula was selected. Mean absolute prediction error (MAE) at 8 weeks of follow-up was calculated for the Hill-RBF, Barrett Universal II, Hoffer Q, SRK/T, and Holladay 1 IOL power formulas. Percentages of eyes having residual refraction within ±0.50, ±0.50 to ±1.00, and greater than ±1.00 diopters (D) of target refraction were calculated.

Results:

The MAEs were 1.08 ± 1.00 D for the Hill-RBF, 1.24 ± 1.20 D for the Barrett Universal II, 1.25 ± 1.06 D for the Hoffer Q, 1.25 ± 1.10 D for the SRK/T, and 1.28 ± 1.01 D for the Holladay 1 formulas. The Hill-RBF formula had the lowest MAE, which was significantly lower than the Holladay 1 and Hoffer Q formulas. However, the difference in MAE between the Hill-RBF and the SRK/T and Barrett Universal II formulas was not statistically significant (
P
> .05). The Hill-RBF group had the maximum percentage of eyes with residual error within ±0.50 D of the target refraction.

Conclusions:

The overall evidence from the studies indicates that the Hill-RBF method that uses artificial intelligence and works independent of specific anatomical features is non-inferior to the Barrett Universal II, Hoffer Q, SRK/T, and Holladay 1 formulas in pediatric eyes.

[
J Pediatr Ophthalmol Strabismus
. 2023;60(4):282–287.]
Gas-Net: A deep neural network for gastric tumor semantic segmentation
Authors: KAZI TANI Lamia Fatiha , KAZI TANI Mohammed Yassine , KADRI Benamar
Published: September 2022

Currently, the gastric cancer is the source of the high mortality rate where it is diagnoses from the stomach and esophagus tests. To this end, the whole of studies in the analysis of cancer are built on AI (artificial intelligence) to develop the analysis accuracy and decrease the danger of death. Mostly, deep learning methods in images processing has made remarkable advancement. In this paper, we present a method for detection, recognition and segmentation of gastric cancer in endoscopic images. To this end, we propose a deep learning method named GAS-Net to detect and recognize gastric cancer from endoscopic images. Our method comprises at the beginning a preprocessing step for images to make all images in the same standard. After that, the GAS-Net method is based an entire architecture to form the network. A union between two loss functions is applied in order to adjust the pixel distribution of normal/abnormal areas. GAS-Net achieved excellent results in recognizing lesions on two datasets annotated by a team of expert from several disciplines (Dataset1, is a dataset of stomach cancer images of anonymous patients that was approved from a private medical-hospital clinic, Dataset2, is a publicly available and open dataset named HyperKvasir ‎[1]). The final results were hopeful and proved the efficiency of the proposal. Moreover, the accuracy of classification in the test phase was 94.06%. This proposal offers a specific mode to detect, recognize and classify gastric tumors.
Promising probiotics for the treatment of nephrotoxicity induced during immune-checkpoint therapy against cancers
Authors: Yoshikawa Sayuri , Taniguchi Kurumi , Sawamura Haruka , Ikeda Yuka , Tsuji Ai , Matsuda Satoru
Published: September 2022

The immune-related adverse events resulting from the therapy of immune checkpoint inhibitors could cause kidney injury. Inflammatory reprogramming of regulatory T helper (Treg) cells or type 17 T helper (Th17) cells might be involved in the pathogenesis of nephropathy. Accumulating evidence confirms a connection between the diversity of gut microbiota and kidney diseases, suggesting that successful modification of gut microbiota could attenuate kidney injury. In other words, certain gut microbiota could contribute to the protection of kidneys via the gut-kidney axis. It has been shown that the dysbiosis of gut microbiota might affect the gut-kidney axis, leading to nephrotoxicity. On the contrary, altered levels of D-amino acids, ROS, and SCFAs through the adjustment of gut microbiota might be relevant to the reduction of nephrotoxicity. Here, we have discussed and suggested the beneficial roles of gut microbiota in the prevention of the kidney injury induced during immune-checkpoint therapy.
Semi-analytic solutions of nonlinear multidimensional fractional differential equations
Authors: Botros M. , Ziada E. A. A. , EL-Kalla I. L.
Published: September 2022

In this paper, the Adomian decomposition method (ADM) and Picard technique are used to solve a class of nonlinear multidimensional fractional differential equations with Caputo-Fabrizio fractional derivative. The main advantage of the Caputo-Fabrizio fractional derivative appears in its non-singular kernel of a convolution type. The sufficient condition that guarantees a unique solution is obtained, the convergence of the series solution is discussed, and the maximum absolute error is estimated. Several numerical problems with an unknown exact solution are solved using the two techniques. A comparative study between the two solutions is presented. A comparative study shows that the time consumed by ADM is much smaller compared with the Picard technique.
GLCM and CNN Deep Learning Model for Improved MRI Breast Tumors Detection
Authors: Alsalihi Aya , K. Aljobouri Hadeel , ALTameemi Enam Azez Khalel
Published: September 2022

Breast cancer is one of the most common types of cancer among Iraqi women. MRI has been used in the detection of breast tumors for its efficient performance in the diagnosis process providing high accuracy. In this paper, breast MRI image data from 89 patients were classified using GLCM and CNN feature extraction methods. Four models were evaluated consisting of GLCM, CNN, combined GLCM and CNN features based models. The statistical ANOVA feature selection method was used to reduce the redundant features. The reduced feature subset was fed to CNN classifier for obtaining either normal or abnormal breast images. The proposed method was assessed in terms of accuracy, precision, recall and F1-score. The model provided 100% classification accuracy.
Secure Chaos of 5G Wireless Communication System Based on IOT Applications
Authors: Alrikabi Haider Th.Salim , Tuama Hazim Hussein
Published: September 2022

This research is aimed at planning the manner in which the secure 5G communication can be controlled based on traffic floods. To accomplish excellent administration execution of organization observing and 5G directing calculation is inescapable, dynamic steering in actual organization equipment isn't reasonable for practical plans of action. Accordingly, to bring down functional and capital consumption, we propose a strategy called versatile steering made do with the help of 5G (Quality of Service and MANET (Mobile specially appointed Network). A practical 5G steering model which will help with fulfilling the needs of the customers and simultaneously gives huge investment funds in item cost and convenience was presented in this paper. To perform versatile 5G steering, we planned geography in a virtualized climate. We customized CHAOS for network traffic flood the board which goes about as a consistent northward API in 5G directing. Network traffic is infused dynamically from 1MB up to 10MB (connect b/w) in a progressive way for similar organization traffic with 10 organization occurrences. In conclusion, we performed versatile 5G steering applying the control hypothetical method with the assistance of CHAOS and MANET calculations. By looking at two directing situations, we noticed a prominent distinction in throughput for controlling organization traffic application in MANETs. Network traffic flood data is refreshed after clockwork.
Charles Ange Laisant (1841 – 1920) : la mathématique, philosophie – enseignement
Authors: Auvinet Jérôme
Published: September 2022

La Mathématique, Philosophie-Enseignement de Charles Ange Laisant, publiée en 1898, marque le début d’une nouvelle période dans l’œuvre de ce mathématicien. Quelques années avant la réforme de 1902, l’auteur souligne les transformations qui sont intervenues au cours du xixe siècle et la nécessaire modernisation de la vision et de l’enseignement des mathématiques qui en découle. L’unité de cette science, son caractère expérimental, la promotion des méthodes générales ou l’entraide entre les différentes branches des mathématiques pures ou appliquées sont autant de pistes de réflexions pour le fondateur de la revue L’Enseignement Mathématique, qui poursuit ici, auprès des étudiants, des enseignants et des ingénieurs, son œuvre de diffusion entrepris notamment au sein de l’AFAS.
Promenade en arithmétique maya
Authors: Cauty Andre
Published: September 2022

Cette promenade a pour objet de présenter quelques pièces du trésor des sciences méso-américaines, particulièrement brillantes chez les Mayas du iiie au ixe siècle : 1) le temps bidimensionnel ; 2) le type « protractif » des numérations parlées ; 3) l’écriture des dates et des durées avec ses deux zéros et ses changements de couleur ; 4) un résultat remarquable obtenu par les scribes mayas pour corriger l’obsolescence des éphémérides de Vénus.
Acteurs et enjeux de la préservation du patrimoine scientifique : le cas de l’Université Louis Pasteur de Strasbourg
Authors: Soubiran Sébastien
Published: September 2022

L’objectif de cet article est d’analyser les rôles variés qui furent conférés aux collections et musées universitaire au sein de l’Université Louis Pasteur de Strasbourg (ULP) au cours des trente dernières années. Cette réflexion est au carrefour de quatre phénomènes qui apparaissent à peu près au même moment : l’élargissement du champ du patrimoine, la construction d’une culture scientifique et technique, la montée en puissance de la communication, la volonté des universités d’être reconnues comme acteurs culturels. L’ensemble de ces phénomènes participe à plusieurs niveaux et de façon différente à donner un rôle nouveau aux collections et musées universitaires.
Comparison of Multi-Fidelity Approaches for the HART-II Rotor Noise Prediction Using CREATETM-AV Helios
Authors:   Science & Technology Corporation, Jia Zhongqi , Sinsay Jeffrey
Published: September 2022

This paper presents a comparison of multi-fidelity approaches for the HART-II rotor noise prediction using the high-fidelity and multi-disciplinary rotorcraft analysis software suite CREATETM-AV Helios. The acoustic simulations are performed using the noise prediction tools AARON/ANOPP2 and PSU-WOPWOP. Both permeable and impermeable formulations of the Ffowcs Williams and Hawkings equation are considered for noise predictions. The HART-II baseline and 3/rev high harmonic control (HHC) minimum vibration cases are simulated and validated against test measurements. Compared with the free-wake simulation, the highfidelity CFD/CSD loose coupling simulations agree better with the measured data but still under-predict the advancing side airloads. Both impermeable and permeable surface approaches show better noise predictions than the free-wake approach in terms of noise directivity and amplitude. As the finest wake-grid resolution reduces from 7.5% to 5% chord, the impermeable surface strategy shows an increment of 3 dB in maximum mid-frequency sound pressure level (SPL) on the advancing side of the mid-frequency SPL contour. The maximum mid-frequency SPL on the retreating side of the vehicle is only increased by 1 dB. At a finer wake-grid resolution, the permeable surface approach does not show improvement in blade-vortex interaction (BVI) noise prediction on the advancing side of the rotor disk.
The Effect of Boundary Layer Character on Stochastic Rotor Blade Vortex Shedding Noise
Authors:   NASA Langley Research Center, Thurman Christopher , Pettingill Nicole , Zawodny Nikolas
Published: September 2022

This work illustrates the effect of a rotor blade's boundary layer on the broadband laminar boundary layer vortex shedding (LBL-VS) self-noise emitted from an optimum hovering rotor through experimental and multifidelity computational studies. Blade surface roughness effects associated with different manufacturing techniques and the effect of adding a boundary layer trip were shown to decrease LBL-VS noise by upwards of 30 dB at the frequency of maximum emission with as light penalty in aerodynamic performance when compared with smooth rotor blades. Low-fidelity 2-D viscous flow analysis verified the presence of laminar separation bubbles on the rotor blades, which are responsible for LBL-VS noise. Three high-fidelity lattice-Boltzmann simulations were conducted with different wall-functions to predict the boundary layer character correspondent to their experimental counterpart and the resultant presence or absence of LBL-VS noise. Excellent aerodynamic and aeroacoustic agreement was seen between the lattice-Boltzmann simulations and the experimental data for the cases with surface roughness and the boundary layer trip.The broadband noise results from the simulation with fully turbulent wall-functions diverged from the experimental results above 5 kHz. The transitional wall-function simulation, which emulated the smooth experimental blades, under predicted thrust by 14% and broadband noise by a minimum of 10dB with an accurately predicted broadband noise trend.
Aeroacoustic Prediction and Validation of Variable RPM Rotors and Rotor-Airframe Interactions for Advanced Air Mobility Applications
Authors:   Continuum Dynamics Inc., Botre Mrunali ,   Pennsylvania State University, Brentner Kenneth , Wachspress Daniel , Feng Ze
Published: September 2022

Aeroacoustic prediction of the tonal noise sources for rotors operating with time-varying rotor rotation rate (RPM) is explored. Enhancements to the CHARM analysis and CHARM/PSU-WOPWOP interface software are described that are required to support acoustic predictions of time-varying RPM multiple rotor and rotor + strut configurations. Predictions are compared with acoustic test data from (Ref. 1) and (Ref. 2) for both constant and time-varying RPM. The configuration with time-varying RPM was considered to understand the tonal noise sources with a focus on loading noise. The effect of change in RPM on aerodynamic interaction between rotor and strut and its effect on loading noise was studied. A comparison between NASA wind tunnel test data and predictions for an isolated ideally twisted rotor is carried out with time-varying rotor RPM data. Sound pressure spectrum plots are generated for raw test data, filtered test data (frequency range 250-1500 Hz), and acoustic pressure time history to perform validation at in-plane and out-of-plane microphones.
Analytic Prediction of Rotor Broadband Noise with Serrated Trailing Edges
Authors:   University of California Davis, Li Sicheng , Lee Seongkyu
Published: September 2022

Trailing-edge serrations are known to be an effective way to reduce broadband noise on wing sections, but their noise reduction capabilities on rotorcraft have not been fully understood. This paper develops a new approach to analytically predicting and investigating broadband noise of rotors with serrated trailing edges. To achieve rotorcraft broadband noise predictions, we extend Lyu and Ayton's semi-infinite serrated wing model to include the finite blade span, the modified scattering coefficient, and the spanwise observer distance. The validations show good agreements with experimental data for serrated trailing-edge noise of a wing section, a hovering rotor, and a forward-flight rotor. Next, the effects of serration parameters on rotor broadband noise are studied. For optimal and realistic rotor broadband noise reduction, the desirable design of a serrated-blade rotor has the serration height to wavelength ratio of 2, the radial range of serrations from 50% blade span to the tip. It is also found that the sine-wave, chopped peak, or saw-tooth serration shapes reduce noise most among various shapes that are considered. Finally, noise reduction with serrations is applied to urban air mobility (UAM) aircraft. A 6-passenger eVTOL quadrotor is found to have more than 9 dB noise reduction potential with serrated trailing edges, where higher noise reductions are observed with higher tip speeds and fewer blades. Serrated-blade quadrotors are found to have the dipole broadband noise directivity, and noise reductions are observed at all observer angles.
Measured Acoustic Characteristics of Low Tip Speed eVTOL Rotors in Hover
Authors:   Research Techsburg Inc., Fleming Jonathan ,   AVEC Inc., Schwartz Kyle ,   Virginia Tech, Alexander Nathan , Gold Jacob , Langford Matthew , Wisda David , Whelchel Jeremiah
Published: September 2022

To document noise characteristics and provide validation data for acoustic modeling of rotor systems appropriate for eVTOL/UAM aircraft, the team of Techsburg, AVEC, and Virginia Tech performed an outdoor static test of a subscale 5-blade rotor. The testing was carried out as part of a program to demonstrate feasibility and performance of a quiet rotor system in support of the eVTOL industry. Techsburg designed a low-tip speed rotor to approximate performance required by a 4-5 passenger UAM vehicle. A driving design feature was low-tip speed operation (Mtip ~0.27) at system disk loadings of 7 to 8 psf (~3.7 N/m2). The test article was designed as a ground adjustable pitch 5-blade rotor, and 2-blade and 3-blade versions of this rotor were also tested during this project. The test article size of 3 feet diameter (0.91 m) represented a scale factor of approximately 30% compared to a full size vehicles currently in operation or development today. The aerodynamic performance in hover was consistent with other rotor systems tested in the past at Techsburg (Figure of Merit ~0.70), and the effects of naturally occurring turbulence on rotor acoustics was measured using a 180-deg arc array of ground plane microphones at the Virginia Tech Drone Park test facility. The paper closes with a discussion of simulating the experiment with the PowerFLOW LBM solver with and without flow turbulence.
Control Method of the Rotor Noise Based on Sound Pressure Cancellation
Authors:   Nanjing University of Aeronautics and Astronautics, Ding Yan , Hu Rui , Zhao Qijun , Chen Xi , Zhao Guoqing
Published: September 2022

The volume of noise has become a major issue in limiting the range of helicopter applications. This paper employs a method of the actively controlled drag piece to reduce the volume of rotating noise produced by rotor blades. The flow field characteristics of the rotor blades are numerically simulated using a high-precision RANS solver-CLORNS to obtain high-resolution sound source information. The rotor noise is then predicted using the Farassat 1A formulation and the rotor aerodynamic noise prediction method. To validate the method, a common UH-1H arithmetic example is used. The standard approach was used to calculate the rotor noise characteristics, and particular results were obtained by focusing on the influence of each parameter of the drag piece.
Blade Shape Optimization of Mars Helicopter Exploring Pit Craters
Authors:   Japan Aerospace Exploration Agency, Sugiura Masahiko ,   Tokyo Metropolitan University, Kanazaki Masahiro ,   Kogakuin University, Sato Makoto ,   Tokyo University of Agriculture and Technology, Minajima Takuma , Kimura Keita , Oyama Akira , Sugawara Hideaki , Tanabe Yasutada , Kishi Yuki , Kikuchi Daisuke , Yoshikawa Kota , Buto Yuta , Minajima Takuma
Published: September 2022

Pit craters on Mars are assumed to be used as manned exploration bases and it is highly possible that life signature would be discovered there since its temperature is appropriate and it is less affected by radiation. Regarding pit crater exploration, helicopter which can climb and descend quickly is expected to be utilized. This paper introduces blade shape optimization of Mars helicopter exploring pit craters. Definition of a mission, selection of aircraft types, conceptual design, optimization of blade twist angle and airfoil, and rotor test are conducted. As a result, hexa-rotor which has robustness, resistance to gust, and fault tolerance is proposed. Moreover, it is confirmed that the mission can be accomplished, carrying instruments on the helicopter within payload weight. Hovering performance of the helicopter is improved by optimizing blade twisting angle and airfoil. And it is found that there is a good correlation between experiment and numerical simulation with respect to the helicopter's hovering performance.
6-DOF Flight Dynamics Model Identification of a Hybrid-Lift Multicopter in Hover
Authors:   California State Polytechnic, Graham Mitchell , Bhandari Subodh
Published: September 2022

This paper presents the identification and verification of a six degrees-of-freedom (6-DOF) flight dynamics model of a hybrid-lift (buoyancy and propulsive lift) multicopter unmanned aerial vehicle using the frequency-domain system identification technique. The hybrid-lift flight vehicle of interest was a dynamically representative (by z-axis CB vs CG location and Buoyancy Ratio) 29% hub-to-hub scale prototype of a full-scale vehicle designed for multi-use operations with a maximum payload of 250 lbs. From the system identification process, it was concluded that stable roll and pitch dynamics can be expected from a hybrid-lift multicopter configuration designed with high Buoyancy Ratio (BR) and a stabilizing buoyant restoring moment. This dynamic behavior is uniquely different from standard multicopters, which exhibit extremely unstable dynamics in those axes. Additionally, from the heavily attenuated yaw-axis dynamic control response, it was concluded that a vertical tail or other yaw effector is needed for the control of similarly configured hybrid-lift vehicles.
Medium-Fidelity CFD Modeling of Multicopter Wakes for Airborne Sensor Measurements
Authors:   NASA Ames Research Center, Chiew Jonathan ,   U.S. Geological Survey, Manies Kristen , Aftosmis Michael
Published: September 2022

A steady-state multicopter simulation capability leveraging automated Cartesian grid generation and a blade element source term rotor model was used to investigate multi-rotor aerodynamics in and out of ground effect. Simulations demonstrated that this model is able to predict reasonably accurate thrust in ground effect for both single and multiple propeller cases. The method yielded accurate lift and drag predictions for a commercial quadcopter when compared to recent wind tunnel test data. This aircraft was then simulated in a variety of flight conditions, including both hover and edgewise forward flight, to determine if generalized guidelines for airborne sensor placement could be developed. Velocity perturbation contours showed regions of affected air upstream of the vehicle at low speeds which contracted as the aircraft's speed was increased. Placing the sensors more than one characteristic length ahead of or above the aircraft reduces errors from rotor-induced flow at higher speeds. For low-speed forward flight, the entrainment of flow into the propeller wakes introduces significant flow turning above the aircraft, suggesting that a forward location, where the perturbations are more moderate, could be advantageous for these conditions.
Propeller Ground and Ceiling Effect in Forward Flight
Authors:   University of Dayton, Cai Jielong , Gunasekaran Sidaard
Published: September 2022

The study of the fixed-pitch small-scale propeller in ground/ceiling effect is extended to forward flight conditions. Force based experiment and smoke flow visualization is conducted at the University of Dayton Low Speed Wind Tunnel. The propeller is mounted at different incidence angles to simulate the transition to forward flight from hover and forward flight conditions. The effect of propeller incidence angle seems to be negligible at J=0. The power required at constant thrust shows an increasing trend after a threshold advance ratio for each h/D and then decreases steeply upon further increase in advance ratio. Smoke flow visualization revealed the presence of three distinct zones separated by the onset of the fountain vortex and the onset of the ground vortex at each ground distance. At advance ratios below the onset of the fountain vortex lies the optimal ground effect zone. An increase in advance ratio beyond this threshold will result in power increment due to the fountain vortex. Further increase in advance ratio initiates the onset of the ground vortex where the ground effect is significantly reduced. The onset of the fountain vortex and the ground vortex occurs at lower advance ratios for a propeller at an incident angle to the ground.
Time Efficient Methodology for the Evaluation of Aerodynamic and Flight Mechanics of the RACER Compound Helicopter in Hover under Cross Wind Conditions
Authors:   ONERA, Ronan Boisard
Published: September 2022

This paper describes a new mid-fidelity, steady RANS based, method to predict the aerodynamic interactions between rotating and fixed parts of the compound rotorcraft RACER of Airbus Helicopters. The method models main rotor and side propellers with source terms, hence avoiding near-body grids and unsteady overset grid techniques. The method is then applied to the analysis of the flight mechanics of the RACER in hover flight under cross-wind conditions, as part of the de-risking of the coming flight testing. The method is validated by comparison with higher-fidelity, URANS based, results taken from the literature. Trends on aircraft controls and pitch and roll attitudes are found to be consistent. The new mid-fidelity methodology provides physical insight on how the aerodynamic interactions between main rotor, fuselage, wings, rear parts, side propellers and cross wind impact aircraft controls and attitude to maintain a stabilized hover under cross-wind.