Results 41 to 50 of about 51,014 (299)

Interactional aerodynamics and acoustics of a hingeless coaxial helicopter with an auxiliary propeller in forward flight [PDF]

, 2008
The aerodynamics and acoustics of a generic coaxial helicopter with a stiff main rotor system and a tail- mounted propulsor are investigated using Brown's Vorticity Transport Model.
Brown, R.E., Kenyon, A.R., Kim, Hyo Wan, Kenyon, Adam R., Duraisamy, K., Kim, H.W., Duraisamy, Karthikeyan, Brown, Richard   +7 more
core  

Guiding Healthcare Organizations in Strategic Pathways: Assessing a Dynamic Adaptive Model

The International Journal of Health Planning and Management, EarlyView.
ABSTRACT In an era of increasing uncertainty and complexity, healthcare decision makers must navigate dynamic environments with greater awareness and adaptability. This study assesses what the impact is of the Dynamic Adaptive Decision Support model (DADS) on stewarding capacity by fostering adaptability, resilience, and strategic foresight.
Anke Aarninkhof‐Kamphuis, Hans Voordijk, Geert Dewulf   +2 more
wiley   +1 more source

Numerical Analysis of Aerodynamic Performance of Low Tip‑Speed Rotors with Gurney Flaps

Nanjing Hangkong Hangtian Daxue Xuebao
To explore the potential for increasing lift on low tip-speed rotors， a rotor performance calculation model is established. The flight data of the UH-60A helicopter are utilized to validate this model.
WAN Haoyun, HAN Dong, WANG Tianjian
doaj   +1 more source

Abdominal POCUS Education for Clinicians: A Systematic Review of Teaching Methods for Point‐of‐Care Abdominal Ultrasonography

Journal of Clinical Ultrasound, Volume 53, Issue 3, Page 547-561, March/April 2025.
For patients to benefit from abdominal point‐of‐care ultrasound, the ultrasound examinator must be sufficiently trained. In this systematic review, we identified advantages and disadvantages of different training methods and approaches. We conclude that thoughtful integration of the various educational methods is crucial for stakeholders and educators.
Birkir Örn Sveinsson, Olof Kristin Thorsteinsdottir, Alexander G. P. Browne, Benjamin S. B. Rasmussen, Anders Bo Nielsen, Pia Iben Pietersen   +5 more
wiley   +1 more source

Characteristics of Shock Wave/Boundary Layer Interactions on Rotor Airfoils

Nanjing Hangkong Hangtian Daxue Xuebao
Utilizing the Reynolds‑averaged Navier‑Stokes （RANS） method in conjunction with a locally variable γ‑Rẽθt transition model， an in‑depth investigation is conducted on the characteristics of shock wave/boundary layer interaction （SWBLI） for the rotor ...
YANG Liuqing, ZHAO Guoqing, WANG Qing, JING Simeng, MA Li, ZHAO Qijun   +5 more
doaj   +1 more source

Evaluating the Role of Analogies in Biochemistry Education: Lessons Learned From Pre‐ and Post‐Pandemic Dental Student Perceptions

Journal of Dental Education, EarlyView.
ABSTRACT Biochemistry forms the foundation for understanding biomolecules and molecular processes crucial to dental and oral biology. However, it is often perceived as a challenging subject for dental students with diverse educational backgrounds. Analogies are a pedagogical tool that helps explain new and abstract concepts in biochemistry.
Ulysses Tsz Fung Lam, Yun Chau Long
wiley   +1 more source

An Efficient Method for Rotor Aeroacoustic Calculation Accounting for Rotor Downwash Influence

Aerospace
Based on the Ffowcs Williams–Hawkings equations and the computational fluid dynamics method, the rotor’s aeroacoustic characteristics, considering the influence of the downwash flowfield on the sound propagation process, are calculated and analyzed ...
Bo Wang, Xuan Gao, Wei Bian, Xi Chen, Qijun Zhao   +4 more
doaj   +1 more source

This is fine: Mule deer and elk do not substantially change their behavior in response to active wildfires

The Journal of Wildlife Management, EarlyView.
During an outbreak of 7 wildfires in eastern Oregon, USA, we analyzed the home range and movement patterns of mule deer and elk before, during, and immediately after wildfires. Mule deer maintained high site fidelity during the wildfire but used their home range more uniformly and had higher daily displacement than deer unaffected by wildfire.
Jacob W. Dittel, Darren A. Clark
wiley   +1 more source

Combined Machining of Ti-6Al-4V Alloy Using Electrochemical Milling and Electrochemical Grinding

International Journal of Electrochemical Science, 2019
Ti-6Al-4V is a typical difficult-to-cut material with which it is difficult to achieve a high processing efficiency and good surface quality simultaneously using a single processing method.
Gangqiang Liu, Hansong Li, Shen Niu, Xiaokang Yue, Ningsong Qu   +4 more
doaj   +1 more source

Development and Application of Special Extinguishing Agent Concentration Measurement

Hangkong gongcheng jinzhan, 2020
It is necessary to measure the situation of extinguishing agent concentration along with time in the ground simulation test of helicopter/airplane powerplant.
WU Yanyan, YANG Xiaolong, LI Haitao, LUO Tiegou, ZHENG Youlan, MIN Xingming   +5 more
doaj   +1 more source