bluuebunny/crossref_metadata_2025 huggingface dataset:
KEBIJAKAN TERHADAP KESEJAHTERAAN MASYARAKAT LANSIA JEPANG YANG BERORIENTASI PADA MODEL PEMBERDAYAAN KOMUNITAS
Authors: Cahyani Yesy Tri
Published: July 2023

Abstract

 

            This article provides a brief overview of the situation of the elderly in Japan, including demographic and social changes in Japan, policy direction, and empowerment-oriented community development model. Through human security approach: protection and empowerment, government retain the primary role and responsibility for ensuring the survival, livelihood and dignity of their citizens, and requires greater collaboration and partnership among regional organizations and civil society. The human security approach, is more than an exercise in joint programming. This approach is people-centered. It considers the broad range of conditions that threaten the survival, livelihood, and dignity of people and their communities particularly those who are most vulnerable (UN Commissions of Human Security, 2010). In this case is elderly people. Policy direction designed to address elderly related issues. The potential of empowerment-oriented community development intervention strategies to decrease the gap between available institutional and formal community-based services and the needs of the elderly and their families in their efforts to meet late life challenges. The policies and programs are imitable for countries like Indonesia, where there is no substantial policies and programs for caring the elderly. We can learn various experiences from Japan both in the approach of protection (policy direction) and empowerment (collaboration and partnership) programs.
CAPTURING STUDENTS ENGLISH LEARNING EXPERIENCES THROUGH PHOTOVOICE
Authors: Nehe Berita Mambarasi , Fahmi Yulinar Rahayu , Nurhayati Nunung
Published: July 2023

This research aimed to find out the experiences of students in learning English online during COVID-19 and students’ writing skills. It uses Photovoice as the research methodology. Data collection is done through Photovoice and in-depth interviews. 15 students of class VIII-I of SMPN 1 Rangkasbitung participated in this study. Data from students' explanations on their photos were analyzed qualitatively to find out students' experiences of learning English online through their writings about the photos. After that, the researcher did a cross check and compared the information from the students' writings, photos and interviews. In this study, researchers found that the Photovoice method can be used as a technique to help students in learning English. It can also help students express their experience of learning English online during the pandemic. Besides that, students' perception of English learning online during the pandemic has negative perceptions. This can be shown from the results of Photovoice supported by in-depth interviews. 11 out of 15 students got negative feelings, while four students had positive feelings. Three students stated they have difficulty in joining online classes and 12 students stated the other way around. From the findings above, it can be concluded that the Photovoice method can be used for teaching writing as students can still learn online easily.
AI-powered Badminton Video Detection: Enhancing Gameplay Analysis and Training
Authors: Kim Jay
Published: July 2023

This research focuses on the use of AI-powered badminton video analysis to enhance gameplay analysis and training. The technology utilizes artificial intelligence and machine learning algorithms to analyze varJaccard Similarity Index aspects of badminton game footage, including player movements, shot selection, and game strategy. It provides personalized feedback and recommendations for improvement to players and helps coaches identify patterns and trends in their players' performance.

The use of lightweight models, such as YoloV5, is essential for real-time video analysis due to the need for high-speed processing. These models, including MobileNets, EfficientNets, SqueezeNet, ShuffleNet, and Tiny-YOLO, are designed to be lightweight and optimized for speed while maintaining high accuracy.

The Yolo model, a one-shot learning model, is particularly suitable for real-time object detection tasks due to its impressive speed and accuracy. It uses anchor boxes and data augmentation techniques to quickly learn and recognize objects with a high level of accuracy.

The research process involved the collection of badminton match videos, preparation of datasets, and testing of the YoloV5 model's performance. Precision and Jaccard Similarity Index metrics using Jaccard similarity were used to evaluate the model's performance in detecting player positions and court boundaries.

The results showed that the YoloV5 model performed better when tested on the video data with less clear image of judges in the background. The Jaccard Similarity Index metrics using Jaccard similarity demonstrated improved performance when tested on generalized video data  was used to accurately evaluate the overlap between predicted and ground truth

Overall, AI-powered badminton video analysis has the potential to revolutionize the way badminton is played and coached. The use of lightweight models like YoloV5 enables faster and more efficient real-time analysis, making it practical for a wide range of applications in badminton.
Dukungan Sosial Dan Penerimaan Diri Anak Binaan
Authors: Amalia Gina
Published: July 2023

Anak binaan yang menjalani masa pembinaan mengalami beberapa perubahan dalam kehidupannya dimana mereka akan hidup terpisah dengan orang tua, keluarga, teman, masyarakat, hilangnya kebebasan untuk menjalani kehidupan sebagaimana remaja pada umumnya, hak-hak yang semakin terbatas, dan gelar narapidana yang melekat pada dirinya. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh dukungan sosial terhadap penerimaan diri pada anak binaan di LPKA Kelas I Martapura. Metode penelitian ini menggunakan pendekatan kuantitatif dengan analisis regresi linier sederhana. Pengambilan sampel dalam penelitian ini menggunakan teknik non-probability sampling dengan metode sampel jenuh. Subjek penelitian ini yaitu anak binaan di LPKA Kelas I Martapura sebanyak 45 subjek. Skala yang digunakan pada penelitian ini adalah skala dukungan sosial dan penerimaan diri, dengan model penskalaan adalah skala Likert. Hasil dari penelitian ini adalah terdapat pengaruh yang signifikan antara dukungan sosial terhadap penerimaan diri.
Pengaruh Profitabilitas, Likuiditas, Kualitas Audit, Corporate Governance dan Ukuran Perusahaan terhadap Penghindaran Pajak
Authors: Anggara I Nyoman Agus Wahyu , Verawati Yenny , Bhegawati Desak Ayu Sriary
Published: July 2023

This study aims to analyze the effect of profitability, liquidity, audit quality, corporate governance and company size on tax evasion. The sample used is 193 manufacturing companies listed on the Indonesia Stock Exchange for the 2018-2021 period. Determination of the sample using purposive sampling technique. The data analysis technique used is multiple linear regression analysis.The results of this study indicate that the variable profitability, audit committee and firm size have a positive effect on tax evasion. While the audit quality variable has a negative effect on tax evasion. And the variable liquidity and independent commissioners have no effect on tax evasion. For further research, this research can be developed using other variables that have an influence on tax evasion.
Training Counselors to provide Trauma Informed Care: CACREP-Accredited Program Survey
Authors: - Dr. Shalini Mathew , - Dr. Bixi Qiao , - Dr. Erin Kaszynski
Published: July 2023

The current study examined course descriptions of 763 U.S. CACREP-accredited counseling programs to investigate the offering of Trauma-Informed Care course (TIC; stand-alone and offered alongside with another course). Results revealed only 26 programs offered a stand-alone TIC course. Future recommendations and implications in the counseling field are discussed.
Petrochemistry of Phyllites from Patharkhola, Lesser Kumaun Himalaya with Reference to Tectonic Implications
Authors: Rana Haritabh , Thomas Harel , Soni Aman , Shukla Satyam
Published: July 2023

Phyllites from Patharkhola, Lesser Kumaun Himalaya have been studied to investigate the geochemical characteristics of these rocks and their formation processes and mechanism of emplacement. Petrographically, phyllites have been showing the mineral assemblages as Biotite (25% approx.)-chlorite (25% approx.)-muscovite (20% approx.)-quartz (10% approx.)-feldspar (10% approx.)-sericite (5% approx.). Geochemically, the analysed four samples of phyllites have high SiO2 and Al2O3 values. Phyllites with higher alumina have more enrichment of trace elements. The enrichment of Zr and depletion of Y and Nb indicate preferential survival of zircon in extreme weathering conditions. The HFSE has shown variation in the ratios due to decoupling with the major oxides. The enrichment of LREE and depletion of HREE suggest mixing of the terrigenous sediments with the concominant magma. Discrimination plots to classify the tectonic settings suggested that the phyllites of Patharkhola have formed in active continental margins.
Implementasi Analisis Faktor Pada Tingkat Kepuasan Mahasiswa Terhadap Layanan Universitas
Authors: Gaol Manto Lumban
Published: July 2023

Survei kepuasan mahasiswa terhadap layanan yang diberikan universitas merupakan salah satu upaya evaluasi dalam rangka menjaga dan meningkatkan kualitas layanan terhadap mahasiswa. Kuesioner survey disusun dengan metode Servqual yang meliputi lima dimensi kualitas yaitu Tangibility, Empathy, Responsiveness, Reliability, Assurance. Kuesioner yang terbentuk terdiri atas 36 pertanyaan dengan skala liker telah memenuhi uji validitas dan reliabilitas. Setelah instrumen digunakan beberapa kali, terdapat mahasiswa yang menyampaikan bahwa pertanyaan yang diajukan dalam kuesioner kebanyakan. Selain itu, sebagian besar mahasiswa memberikan jawaban yang sama untuk semua pertanyaan. Kedua hal ini memunculkan potensi adanya bias dari data survey yang diperoleh. Oleh karena itu diperlukan upaya perbaikan instrumen yang sudah ada. Perbaikan instrumen dilakukan menggunakan metode analisis faktor. Dataset yang digunakan dalam analisis ini terdiri atas 36 variabel awal dan 400 sampel. Penerapan analisis faktor mereduksi 36 variabel awal ke dalam 5 faktor utama.
Early Enteral Nutrition Facilitates Postoperative Recovery and Diminishes Complications in Patients Undergoing Laparoscopic Rectal Cancer Surgery
Authors:   Department of General Surgery, The Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, Hebei, China, Li Yinzu , Liu Hong ,   Department of General Surgery, The Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, Hebei, China, Yang Kuankuan ,   Department of General Surgery, The Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, Hebei, China, Tian Xiaoliu ,   Department of Pharmacy, The Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, Hebei, China
Published: July 2023

We have examined the effect of early enteral nutrition on postoperative recovery as well as the incidence of complications in patients undergoing laparoscopic rectal cancer surgery. The control group received traditional nursing care for postoperative nutrition, whereas the treatment group received early postoperative enteral nutrition. Relative to the control group, the postoperative anal exhaust time, first defecation time, first eating of solid food time, bowel sound recovery time, and hospital stay in the treatment group were shorter (P < 0.05), nutrition-related indexes including serum total protein, albumin, and prealbumin were elevated (P < 0.05), levels of serum inflammatory factors C-reactive protein, interleukin-6, and tumor necrosis factor-α were lower (P < 0.05), peripheral blood CD3+, CD4+, and CD4+/CD8+ cells were elevated, while CD8+ cells were decreased (P < 0.05). The incidence of postoperative complications in the treatment groups was lower relative to the control group (P < 0.05). To sum up, early postoperative enteral nutrition can not only promote the immune function and nutritional status of patients undergoing laparoscopic rectal cancer surgery but also help reduce the postoperative inflammatory response and promote recovery.
The Relationship between Hand Dexterity with Hand Grip Strength in Young Males
Authors: Angel Ling Li Qin  , Brinnell Caszo  , Mohammad Arshad Ikram  , Justin Vijay Gnanou
Published: July 2023

Background: Hand dexterity a measure of hand flexibility and coordination can be affected by many factorsincluding hand grip strength. However, there are limited studies and data about the association between handdexterity and grip strength in Asian population. Hence, we aim to investigate the relationship between handdexterity and hand grip strength in healthy males aged between 18 to 25 years old in Asian population.Methods: Fiftyhealthy adult male participants between 18-25 years were recruited by advertisement.Hand gripstrength and hand dexterity test by using a handheld dynamometer and Purdue pegboard test, respectively wasmeasured. Purdue pegboard test consisted of two main parts: 1. Inserting pins into the pegboard holes usingleft, right, and both hands in 30 seconds. 2. Assembly using pins, collars, and washers in one minute. Pearsoncorrelation coefficient and regression analysis was used to study the association between hand dexterity and handgrip strength.Results: The results showed no correlation between left, right and combined hand dexterity with hand gripstrength (p value = 0.481 and r = 0.099, p value = 0.181 and r value = 0.188, and p value= 0.945 and r value=0.009) respectively. Moreover, the results also showed no statistically significant association between number ofassemblies built and grip strength (p value = 0.430 and r value=0.111).Conclusion: Our results suggest that there is no statistically significant relationship between hand dexterity andhand grip strength in young males aged between 18 to 25 years old. Thus, it can be concluded that hand gripstrength is not a factor that affects hand dexterity in young adult males of Asian population
To Determine the Efficacy of Mulligan Mobilisation and Muscle Energy Technique in Sacroiliac Joint Dysfunction: A Single Blinded, Randomized Clinical Trial
Authors: Neelima Gupta  , Annu Gupta  , Vijay Batra
Published: July 2023

The Sacroiliac Joint Dysfunction may lead to hypermobility or hypomobility at the joint, resulting in pain andirritation. Patient complains of dull aching pain on the affected side. The pain increases during the activities whileturning, sitting, bending or acquired standing posture.The pain gets referred to either groin, gluteal region or the posterior aspect of the thigh. With or without associatednumbness, in groin region and pain on one side is more common than bilateral. This Sacroiliac joint dysfunctioncan be managed conservatively using physical agent modalities such as electrotherapy, laser therapy, ultrasound,longwave, rest, exercises, or using manual mobilisation.Purpose Of the Study: To determine the effectiveness of Mulligan Mobilisation and Muscle Energy Technique inSacroiliac Joint Dysfunction.Material And Method Used: 700 subjects were screened to include 72 subjects with diagnosis of sacroiliac jointdysfunction and further were haphazardly divided into two groups viz. Muscle Energy Technique therapy groupand Mobilisation group via block randomization, depending on severity of pain (mild, moderate, severe) usinglottery method.Results: The values of Visual Analogue Scale, Modified Oswestry Disability Questionnaire and Pain Pressurethreshold within the group were analysed using Paired t-test and between the groups were analysed usingIndependent t-test.Conclusion: MET and Mobilisation both techniques are operative in treatment of Sacroiliac Joint Dysfunction.
Study of Knowledge and Attitudes towards Respiratory Hygiene and Respiratory Exercise in School-Aged Children, According to Gender: A Cross-Sectional Survey Study
Authors: Vani Madaan  , Rishabh Pathak
Published: July 2023

Background: As the COVID-19 epidemic began in 2019 in Wuhan, China, and spread quickly to numerous nations.Therefore, in order to curb the spread of this disease, the government has implemented various preventativemeasures, such as social distance, using napkins when sneezing or coughing, avoid hand contact with thosewho are ill, etc. Children attending large gatherings since schools have resumed operations as per governmentdirectives, making them susceptible to the transmission of Covid-19. In order to stop the spread of the pandemicamong children, it is important to evaluate how school-aged children understand the respiratory exercises andpreventative measures recommended by the Government of India.Methodology: The knowledge and attitudes of school-going youngsters were evaluated using a cross-sectionalsurvey research. A thorough assessment of the literature led to the formulation of the survey’s google formquestionnaire, which included 17 questions in the knowledge and attitude domains. Snowball sampling was usedto distribute the survey questionnaire to 800 students in North Indian schools. Only 673 students were included inthe survey due to the inclusion and exclusion criteria.Results: Among 673 students, 404 students were females (22.965±2.899) and rest were males (22.186±3.772). Ourstudy shows that both the domains’ knowledge (t-stat 3.024) and attitude (t-stat 3.420) are highly significant asthe p-value is <0.001. The correlation between both domains shows that both domains are positively and highlysignificantly correlated as the r-value is 0.44.Conclusion: The precautionary steps that the Indian government implemented have had a positive influence onstudents’ lives and knowledge, and they are taking excellent care of themselves
The integrative model of cognitive-behavioral psychotherapy in personality disorders
Authors:   Department of Ethics and Social Sciences, “George Emil Palade” University of Medicine and Pharmacy of Targu-Mures, Romania, Popa Cosmin O. , Ardelean Mihai ,   Mental Health Center of Targu-Mures, Romania, Nirestean Tudor ,   Department of Ethics and Social Sciences, “George Emil Palade” University of Medicine and Pharmacy of Targu-Mures, Romania, Buicu Gabriela ,   Department of Psychiatry,  “George Emil Palade” University of Medicine, Pharmacy, Science, and Technology of Targu Mures, Romania
Published: July 2023

In their entirety, personality disorders represent specific clinical nosologies which affect areas of the patient's functionality, especially in human relations. Cognitive behavioral psychotherapy involves a number of guidelines/ strategies, most of them benefiting from a solid empirical support; thus, this paper deals with personality disorders from the perspective of the general integrative model of CBT and not from the perspective of a specific therapeutic strategy.
Psychiatric patient profiling during the COVID-19 pandemic – should schizophrenia be assigned among risk factors?
Authors:   Department of General Psychiatry, “Prof. Dr. Alexandru Obregia” Clinical Psychiatry Hospital, Bucharest, Romania, Patrichi Bogdan ,   Department of General Psychiatry, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania, Tapoi Cristiana ,   Department of General Psychiatry, “Prof. Dr. Alexandru Obregia” Clinical Psychiatry Hospital, Bucharest, Romania, Buciuc Adela-Georgiana ,   Department of General Psychiatry, “Prof. Dr. Alexandru Obregia” Clinical Psychiatry Hospital, Bucharest, Romania, Sindrilaru Marina-Irina-Teodora ,   Department of General Psychiatry, “Prof. Dr. Alexandru Obregia” Clinical Psychiatry Hospital, Bucharest, Romania, Rogojina Radu-Stefan ,   Department of General Psychiatry, “Prof. Dr. Alexandru Obregia” Clinical Psychiatry Hospital, Bucharest, Romania
Published: July 2023

Objective. While the identification of vulnerable groups is critical in any pandemic, scarce information has been published on COVID-19 patients with underlying psychiatric comorbidities. The present study aimed to assess whether a preexisting diagnosis of schizophrenia represents an independent risk factor for severe COVID-19 and whether patients with schizophrenia have poorer outcomes of COVID-19 compared to patients with any other premorbid mental illness. Methods. The present data derives from the medical records of 242 patients admitted to “Prof. Dr. Alexandru Obregia” Clinical Psychiatry Hospital (Bucharest, Romania), Department 9, with a positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) test result between October 2020 and May 2021. Results. 128 (52.9%) of the patients were diagnosed with a schizophrenia spectrum disorder. Psychiatric patients who developed a severe form of infection were older and more likely to have relevant somatic comorbidities for COVID-19, compared to the rest of the patients in the study sample (p<0.001). We did not identify a significant association between a particular psychiatric diagnosis and a severe form of infection (p>0.005), with only a small proportion (12.5%) of patients with a diagnosis of schizophrenia spectrum disorder having developed a severe form of infection. Conclusion. Although a pre-existing diagnosis of schizophrenia spectrum disorder was not associated with severe forms of COVID-19, patients with schizophrenia spectrum disorders represented more than half of the population in our study, a finding that supports the higher risk of infection for this group and suggests that these patients should be considered a vulnerable population.
Late-life depression with cognitive impairment – A review
Authors:   “Prof. Dr. Alexandru Obregia” Psychiatric Hospital, Bucharest, Romania, Sopu Andreea ,   Psychiatry Department, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
Published: July 2023

Late-life depression (LLD) is a heterogeneous disorder often associated with different forms of cognitive impairment. Within this pathology, cognitive impairment may represent a prodrome or risk factor for a later form of dementia. Currently, the treatment of the current depressive episode and the long-term follow-up of the evolution of the cognitive disorder is considered the most correct method of therapeutic approach in case these two disorders are associated. In this article, we analyzed different studies with the help of which we wanted to highlight the common risk factors between late-onset depression and cognitive impairment, predictive factors for further progression to dementia, neuropsychological and imaging changes, but also useful therapeutic interventions in patients witch present both disorders.
Neutropenia in a patient with Very-Late-Onset-Schizophrenia-Like-Psychosis under Risperidone treatment – Case report
Authors:   “Prof. Dr. A. Obregia” Psychiatric Hospital, Bucharest, Romania, Nistor Diana , Horosan Lavinia ,   “Prof. Dr. A. Obregia” Psychiatric Hospital, Bucharest, Romania, Giurgiuca Ana ,   “Prof. Dr. A. Obregia” Psychiatric Hospital, Bucharest, Romania,   Psychiatry Department, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
Published: July 2023

This case report describes the clinical evolution of a 75-year-old man with no psychiatric history, hospitalized for psychotic anxiety, commentary and imperative auditory hallucinations, and multimodal delusions in the absence of an affective disorder or neurocognitive decline. He was diagnosed with very-late-onset-schizophrenia-like-psychosis after a complex differential diagnosis, including Alzheimer’s dementia with psychotic symptoms, delirium, Lewy-body dementia, and other psychiatric or general medical conditions. The patient received antipsychotic treatment (Risperidone up to 3 mg/day) with favorable clinical outcomes. However, the laboratory tests showed a low neutrophil count three weeks into treatment. The thorough interdisciplinary evaluation concluded that another cause of neutropenia other than the pharmacologic treatment was improbable. Risperidone was then progressively switched to Olanzapine up to 10 mg/day. Neutrophils returned to base levels after a few days. Unfortunately, the clinical course was unfavorable, and since the reoccurrence of psychotic symptoms was debilitating for our patient, the decision to rechallenge Risperidone was made, starting with low doses of 0.5 mg/day and slowly increasing to 2 mg/day. Despite normal neutrophil count and positive clinical results after seven days, neutropenia was noticed again after two weeks. Therefore, because of the patient’s vulnerability and the uncertainty of periodic outpatient assessment of complete blood count, he was discharged on Haloperidol with resolution of psychotic symptoms and without any side effects. This report’s primary purpose is to highlight a challenging differential in an elderly patient while presenting a rare but potentially harmful adverse effect of Risperidone treatment.
In Situ Development and Application of Fly Neighborly Noise Abatement Procedures for Helicopters
Authors:   Volpe, Page Juliet ,   EBDEA Acoustics LLC, Jacobs Eric , Rapoza Amanda
Published: July 2023

In recent years significant effort has been expended to support and enhance the Helicopter Association International (HAI) Fly Neighborly Program, including focused FAA/NASA flight test programs and helicopter noise model development as well as application efforts conducted with university and industry support. Two of the challenges often faced in implementing Fly Neighborly flight operations can be the lack of available noise abatement procedure information for specific helicopter models and/or difficulties in adapting existing noise abatement procedure information to a given heliport operation. This paper provides an overview of in situ development of Fly Neighborly (FN) approach procedures that would assist operators in addressing these issues, using the Bell 407 as a case study, and examining the application of Fly Neighborly recommendations to a specific helicopter operation, the November Noise Abatement Procedure at East Hampton New York Airport. This work leveraged findings from the joint NASA-FAA-DOD flight test program conducted in 2017 and first principles helicopter noise modeling developed under the FAA ASCENT program by Penn State University in conjunction with the Advanced Acoustic Model (AAM).
On the Use of CFD for Improvement of Low-Fidelity Blade-Vortex Interaction Prediction Code
Authors:   ONERA, Reboul Gabriel , Falissard Fabrice
Published: July 2023

High-fidelity simulations performed with the CFD code elsA have been used to improve a fast prediction code named ARHIS and dedicated to the prediction of the aerodynamic response of a blade in interaction with a vortex. To do so, comparisons have been made on a well documented blade-vortex interaction configuration. After validation of the computational methodology against available measurements, discrepancies between elsA and ARHIS solutions have been observed close to the blade tip due to the bidimensional approach used in the latter. Consequently, a new model of tip loss factor has been developed in ARHIS providing a better agreement between fast and high-fidelity simulations. The maximal error in terms of amplitude of the lift jump due to the blade-vortex interaction goes from 20:1% to 5:2%.This new model has been applied to several cases to assess the impact of the blade shape by considering modification of the aspect ratio, sweep angles, parabolic tip and tapered blade. Even if not designed specifically to account for modification of the blade shape, it is clear that the new tip loss factor model still improves the agreement between AHRIS and elsA results. Finally, the improved model has been tested for the evaluation of the noise emission of complete rotors in descent flight considering a straight and a double swept rotor blade. In all cases, the new model induces a reduction of the predicted noise level of about 0:5 to 1 dB. This noise reduction appears to be an improvement in one case but a deterioration in the other one. However, this worsening is maybe due to a compensation of errors in the entire computational chain. This new modeling needs consequently to be applied on a larger database to conclude on its efficiency in terms of noise predictions.
Performance and Acoustics of Small Rotors with Non-Uniform Blade Spacing
Authors:   CCDC US Army Research Lab, Floros Matthew
Published: July 2023

Thrust, torque, and radiated noise are investigated for small rotors typical of unmanned air systems concepts with non-uniform blade spacing. Blade spacing of 5-bladed rotors is arranged for five unique angles and four levels of non-uniformity. Two configurations are considered, based on a 40-inch rotor with rectangular, untwisted blades, and a 7.5-inch rotor from a commercial quadcopter drone. The performance of the larger rotor was found to be in sensitive to blade number and non-uniform spacing while the smaller rotor showed a degradation between two blades and five of 5% in hover and 9% in forward flight, but was also insensitive to non-uniform spacing. As the blade spacing was varied from uniform to the most non-uniform, the acoustic spectra gradually changed from a primarily tonal noise at the blade passage frequency to a broadband noise with multiple harmonics. Overall noise level increased as non-uniformity increased, but was significantly lower than a 2-bladed rotor with the same solidity.
Integration of Finite State Dynamic Wake Model for Rotor Interference with Comprehensive Rotorcraft Analysis
Authors:   Advanced Rotorcraft Technology Inc., Kim Jeewoong ,   Washington University St. Louis, Peters David , HE CHENGJIAN , Saberi Hossein
Published: July 2023

Aerodynamic interference is an important aspect of rotorcraft analysis, especially for current and future vertical lifting vehicles with multiple rotors or compound rotor/wing configurations. Extending the finite state dynamic wake to provide interference velocities at lifting surfaces above and below the rotor offers a computationally efficient, yet more accurate modeling approach than the cylindrical vortex sheet and horseshoe vortex methods currently used in comprehensive rotorcraft analysis, such as RCAS. As described in this paper, a finite state dynamic wake model with interference modeling capability that covers the entire flowfield has been integrated into RCAS. The new finite state dynamic wake model is verified by comparing prediction results with the exact solution of harmonic excitation problem and a verification test for the unsteady inflow response to a step collective pitch input. Numerical results from the finite state dynamic wake model in hover and forward flight conditions are validated against a set of test data for both self-induced velocity and off-rotor interference. The new finite state dynamic wake model predicts the fundamental flowfield characteristics and has a close correlation with measured data.
Iterative Blade Element Momentum Theory for a Coaxial Rotor
Authors:   University of California Davis, Lee Seongkyu , Dassonville Maxime
Published: July 2023

This paper presents a new blade element momentum theory (BEMT) for a coaxial rotor in hover. The new BEMT solves the upper and lower rotor induced velocities iteratively so that the mutual rotor-to-rotor interaction is accounted for. The upper rotor induced velocity is affected by the lower rotor thrust and induced velocity, while the lower rotor induced velocity is affected by the upper rotor thrust and induced velocity. Two empirical constants are included in each rotor calculation. This new BEMT provides the performance of each rotor as a function of the rotor separation distance. The new BEMT is validated with measurement data for two coaxial rotor experiments. The first experiment validates the thrust to power coefficients at a given separation distance. The second experiment validates each rotor's figure of merit, thrust, power, interference loss factors, etc., as a function of the rotor separation distance. It is shown that the BEMT captures the trends and magnitudes of the performance as a function of the rotor separation distance compared to the measurement data. Detailed radial distributions of aerodynamic properties are also presented at several separation distances.
Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera
Authors:   German Aerospace Center (DLR), Gardner Anthony ,   NASA, Heineck JT , Wolf Christian , Barnett Miles , Raffel Markus
Published: July 2023

Boundary layer transition measurement was demonstrated using differential infrared thermography on the top side of a helicopter rotor in forward flight. The tests used a FLIR X8500xc SLS long wave infrared camera to observe the DLR EC135 test helicopter rotor. The boundary layer transition was detected for hover out of ground effect (150ft) and for forward flight at 80kt (1700ft). The measured boundary layer transition positions are consistent with previous measurements of the EC135 hovering in ground effect, and with predicted boundary layer transition positions. A method for the analysis of DIT images for a rotor in forward flight is shown, based on computational analysis of a pitching airfoil with varying inflow.
Blade Tip-Vortices of a Four-Bladed Rotor with Axial Inflow
Authors:   German Aerospace Center (DLR), Goerttler Andreas , Braukmann Johannes , Wolf Christian , Gardner Anthony , Raffel Markus
Published: July 2023

The vortex system of four rotating and pitching DSA-9A blades was examined numerically and experimentally. Numerical computations were performed using DLR's finite-volume solver TAU and were validated against experimental data gathered using particle image velocimetry (PIV) carried out at the rotor test facility in Göttingen (RTG). Algorithms deriving the vortex position, swirl velocity, circulation and core radius were implemented. Hover-like conditions with a fixed blade pitch were analyzed giving a good picture of the static vortex system. These results are used to understand the vortex development for the unsteady pitching conditions, which can be described as a super positioning of static vortex states. The use of a zonal DES approach reduced numerical dissipation and improved physical modelling of the vortex development.
Performance Effects of Hover In-Ground-Effect over Sloped Terrain
Authors:   US Naval Test Pilot School, Tritschler John ,   US Naval Academy, Milluzzo Joseph , Holder John
Published: July 2023

The present work reports the results of a research investigation into the performance effects of hovering over sloping terrain as characterized in both laboratory-scale testing of an isolated rotor as well as flight testing of a UH-72A helicopter. The design of the experiment included variation in the slope magnitude, rotor hub height, thrust/power setting, and aircraft orientation with respect to the slope (for the flight test data). In addition to performance measurements, flow field measurements of the laboratory flows were computed via particle image velocimetry, and rotor wake visualizations from flight testing were created via background-oriented Schlieren post-processing techniques. The results show that hovering over sloped terrain results in performance effects that are both nonintuitive and operationally significant. Additionally, the hover performance data collected over level terrain show that inground-effect hover performance is truly a complicated, interdependent relationship that includes multiple specifying conditions; it is not simply a one-dimensional function of hub height above the ground plane. Lastly, a comparison of the flow field measurements from laboratory testing and the rotor wake visualization from flight testing is presented to speculate on the fundamental flow field mechanisms at play and propose an approach for a more rigorous reconciliation of these two data sets in future studies.
Effects of Transition Modeling on the Simulation of Helicopter Rotor Hubs
Authors:   University of Tennessee, Coder James
Published: July 2023

Helicopter rotor hubs are geometrically complex components that experience a wide rage of aerodynamic behaviors and flow physics. This includes strong unsteadiness, large amounts of separation, laminar-turbulent transition, and interactional aerodynamic behaviors (Ref. 1). At high forward flight speeds (high advance ratios), the parasitic drag of the hub accounts for O(30%) of the total power required to fly (Ref. 1). A common method for characterizing this contribution is the hub drag factor, Kfe, which correlates the flat-plate area of the hub with the helicopter gross weight and functions as a technology factor (Ref. 2). In a recent assessment of needs for future vertical lift systems, Ormiston suggested that the hub drag factor needs to be reduced from the current state of the art of Kfe = 0.5 down to a value 0.2 (Ref. 3).
Validation of Boundary-Layer-Transition Computations for a Rotor with Axial Inflow
Authors:   German Aerospace Center (DLR), Kaufmann Kurt ,   French Aerospace Lab (ONERA), Richez Francois , Stroeer Philip , Krimmelbein Normann , Gardner Anthony , Lienard Caroline , Gardarein Patrick
Published: July 2023

Boundary-layer-transition computations are performed using the in-house finite-volume solvers elsA by ONERA and TAU by DLR. Reynolds-averaged Navier-Stokes simulations, using the Langtry-Menter model as well as semi-empirical transition criteria, are presented using both solvers for a rotor in climb. The numerical results are compared to temperature-sensitive paint experiments conducted at DLR's rotor test facility. Concerning the Langtry-Menter computation, transition occurs with both solvers due to laminar separation close to the trailing edge, further downstream than seen in the experiment. Semi-empirical transition criteria predict transition within both codes due to laminar separation, which was not detected in the experiments. When only considering the AHD criterion, the transition locations within the numerical simulations and the experiment are in good agreement along the entire span in all three considered test cases. In addition, numerical results are presented for a test case with cyclic pitch. These unsteady boundary-layer transition computations are carried out using the semi-empirical transition criteria approach of DLR-TAU. In accordance with the static test cases, the results are promising, as long as the laminar-separation criterion is deactivated.
Parametric Instability of Planetary Gear Transmission with Elastic Ring Gear due to Discrete Boundary Strut Parameter Variation
Authors:   University of Tennessee, Guan Peng , DeSmidt Hans
Published: July 2023

This paper investigates the effects of different boundary strut parameters on parametric instabilities of planetary gear transmission (PGT) driveline system with elastic ring gear over the whole operating speed range. As an example, to demonstrate the PGT system boundary strut design, an optimal design strategy is briefly introduced not only to obtain a light-weight system, but also to satisfy the stress and buckling conditions of the boundary struts. Assumed-modes method is used to discretize the system and Floquet method is applied to the established PGT driveline system with elastic thin ring gear supported by discreate boundary struts to explore the parametric instabilities of the PGT system due to different boundary strut parameter variations. The results show that by properly selecting the boundary strut parameters, the parametric instabilities of the PGT driveline system can be avoided or shifted. Therefore, vibrations of the PGT system introduced by the parametric excitations can be suppressed correspondingly.
Dynamic Interactions in an Electromechanical Main Gearbox of a High-Speed Coaxial Compound Helicopter
Authors:   Romax Technology, Park Youn , Schlaich Andreas
Published: July 2023

To further increase the speed of conventional helicopters, several new concepts and technology demonstrators have been developed. This paper proposes an electromechanical main gearbox for a compound, coaxial helicopter. The speed and power variation of the main rotor between hover and high-speed cruise is realised by two brushless permanent magnet (BPM) machines and a differential planetary gear set that act as a continuously variable transmission (CVT). To assess such highly integrated hybrid applications, a novel analysis method is proposed that captures the influences of electrical motor and gear excitations in a full system approach. Alternative gear and motor designs are explored by completing speed sweeps through different operating conditions in the frequency domain. System responses are shown and indicate that motor and gear excitations can interact if their parameters are not selected carefully. This can lead to critical situations when hitting resonances and demonstrates the importance of considering electromechanical interactions from early design stages.
Lessons Learned in Fabrication of a High-Specific-Torque Concentric Magnetic Gear
Authors:   NASA Glen Research Center, Cameron Zachary , Tallerico Thomas , Scheidler Justin
Published: July 2023

Magnetic gearing is being investigated at NASA as a replacement to conventional mechanical gearing in aerospace applications. Some potential benefits of magnetic gears over mechanical gearing are torque transmission without mechanical contact, decreased transmission noise, and no required lubrication. However, in order to be a viable alternative for aerospace applications, magnetic gearing must be shown to provide high enough specific torque (torque per unit mass). NASA's second magnetic gearing prototype (PT-2) was able to achieve promising specific torque on par with low torque mechanical gearboxes. This work will briefly review the electromagnetic and structural design of PT-2, provide detailed information on fabrication and assembly, examine build errors, walk through rebuild efforts to improve operation, and conclude with remarks on build difficulties and opportunities for improvement in future prototypes.
Intelligent Propulsion Materials for Rotorcraft Gas Turbine Engine Component Applications
Authors:   US Army CCDC-ARL, Murugan Muthuvel , Ghoshal Anindya , Walock Michael , Bonis Daniel
Published: July 2023

Rotorcraft gas turbine engines are subject to sand particle ingestion problems during take-off, landing, and hovering operations in sandy desert regions. Although most of the rotorcraft gas turbine engines are fitted with inertial particle separators, they are not efficient in filtering out fine sand particles of size of 75 microns or below. Inlet barrier filters may be efficient in filtering fine particles in the intake air-flow, but they cause engine power loss penalty due to significantly high inlet pressure losses. The sand particles in the air-flow cause severe erosion damage on compressor blades, and molten sand glazing coupled with Calcia-Magnesia-Alumino-Silicates (CMAS) attack on hot-section turbine blades. Due to particle impacts and CMAS attack, the coatings on the blades wear out, form cracks and delaminate over time causing huge maintenance burden for rotorcraft gas turbine engines operating in sandy regions. The objective of this research is to discover a revolutionary, in-situ sensing material system that is capable of monitoring the health of propulsion component materials using co-doped luminescent materials in the erosion resistant coatings or thermal barrier coatings (TBCs) of engine components. This paper presents the research efforts and results from the CCDC - Army Research Laboratory, Vehicle Technology Directorate Director's seedling initiative project that investigated the effectiveness of triboluminescent materials interspersed with blade coatings in a layered form for detecting cracks/fractures that may occur in blade coatings due to sand particle exposure under engine relevant conditions. Use of appropriate instrumentations for in-situ luminescence detection methods to identify cracks/fractures in coatings is also discussed.
An ethical pathway for the use of Artificial Intelligence in Medicine and Nursing Care
Authors: Paladino María Soledad
Published: July 2023

Modern Medicine faces the challenge of acquiring, analyzing, and applying a great amount of data to solve a complex quantity of clinical problems. In this scenario, Artificial Intelligence technologies serve the developing of programs to help professionals diagnose, predict results, and make therapeutic decisions. The same as any technology applied to man, the use of Artificial Intelligence poses ethical questions. In this article the principal ethical problems related to the use of Artificial Intelligence technologies in Medicine are identified and a roadmap for reflection on the former from the praxis perspective is suggested. Nursing is no stranger to the revolutionary change brought about by the introduction of Artificial Intelligence in health care. The recent conclusions of the international think-tank on Artificial Intelligence and Nursing recognized the relevance of the use of these technologies to increase and extend the capabilities of Nursing, including care. Nursing practice raises the question about the impact of Artificial Intelligence technologies on the very essence of Nursing, that is, on the nurse-patient relationship by providing good care. From Nursing epistemology, it is to possible sketch out a pathway for reflection on the ethical problems raised by the use of Artificial Intelligence technologies.
Differences in metabolic improvement after metabolic surgery are linked to the gut microbiota in non-obese diabetic rats
Authors: Luo Xin , Tan Cai , Tao Fang , Xu Chi-Ying , Zheng Zhi-Hua , Pang Qiang , He Xiang-An , Cao Jia-Qing , Duan Jin-Yuan
Published: July 2023

Obstructive jaundice (OJ) is a common problem in daily clinical practice. However, completely understanding the pathophysiological changes in OJ remains a challenge for planning current and future management. The effects of OJ are widespread, affecting the biliary tree, hepatic cells, liver function, and causing systemic complications. The lack of bile in the intestine, destruction of the intestinal mucosal barrier, and increased absorption of endotoxins can lead to endotoxemia, production of proinflammatory cytokines, and induce systemic inflammatory response syndrome, ultimately leading to multiple organ dysfunction syndrome. Proper management of OJ includes adequate water supply and electrolyte replacement, nutritional support, preventive antibiotics, pain relief, and itching relief. The surgical treatment of OJ depends on the cause, location, and severity of the obstruction. Biliary drainage, surgery, and endoscopic intervention are potential treatment options depending on the patient's condition. In addition to modern medical treatments, Traditional Chinese medicine may offer therapeutic benefits for OJ. A comprehensive search was conducted on PubMed for relevant articles published up to August 1970. This review discusses in detail the pathophysiological changes associated with OJ and presents effective strategies for managing the condition.