Nanostructured materials to generate color and control phase of light

Author(s):  
Joel Yang
Author(s):  
Bilan O. A. ◽  
Brubaker I. O. ◽  
Marchenko-Tolsta K. S.

The review examines current trends in the development of biomedical nanotechnology, its application in various fields of medicine and prospects for further development. Among the main directions — monitoring and control of delivery, distribution and use of drugs; nanobiosensors; diagnostics of pathological states; theranostics; use of nanostructured materials in regenerative medicine; nanotoxicology; nanophytopharmacy; green synthesis; development of new nanobiotech devices and nanorobototics.


2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Jae-Sang Park ◽  
Do-Hyung Kim ◽  
Sanghyun Chae ◽  
Ye-Lin Lee ◽  
Jeong-In Go

This work attempts to reduce the hub vibratory loads of a lift-offset rotor using IBC (individual blade pitch control) in high-speed forward flight. As a lift-offset rotor for the present study, the rigid coaxial rotor of a XH-59A compound helicopter is considered and CAMRAD II is used to predict the hub vibration and rotor performance. Using the IBC with a single harmonic input at 200 knots, the vibration index of the XH-59A rotor is minimized by about 62% when the 3/rev actuation frequency is applied with the IBC amplitude of 1° and control phase angle of 270° (3P/1°/270°); however, the rotor effective lift-to-drag ratio decreases by 3.43%. When the 2/rev actuation frequency with the amplitude of 2° and control phase angle of 270° (2P/2°/270°) and the 3/rev actuation frequency using the magnitude of 1° and control phase angle of 210° (3P/1°/210°) are used in combination for the IBC with multiple harmonic inputs, the vibration index is reduced by about 62%, while the rotor effective lift-to-drag ratio increases by 0.37% at a flight speed of 200 knots. This study shows that the hub vibration of the lift-offset rotor in high-speed flight can be reduced significantly but the rotor performance increases slightly, using the IBC with multiple harmonic inputs.


2020 ◽  
Vol 14 (3) ◽  
pp. 222-231 ◽  
Author(s):  
Alireza Esteghamati ◽  
Faramarz Ismail-Beigi ◽  
Pegah Khaloo ◽  
Fatemeh Moosaie ◽  
Hamid Alemi ◽  
...  

Circulation ◽  
2018 ◽  
Vol 138 (Suppl_2) ◽  
Author(s):  
Todd P Chang ◽  
Tia Raymond ◽  
Maya Dewan ◽  
Travis Whitfill ◽  
Ilana Harwayne-Gidansky ◽  
...  

Background: Low-dose, high-frequency CPR training, such as the AHA Resuscitation Quality Improvement program, is designed to prevent skills decay. Preliminary studies have shown success in using gamification- namely a competitive leaderboard - for self-directed CPR training using a feedback-enabled CPR simulator. The purpose of this study was to determine the effect of a larger-scaled gamification system across multiple institutions on self-directed CPR practice frequency and resulting performance. Methods: This was a randomized-control study with 14 institutions. Subjects were healthcare professionals with unlimited access to a feedback-enabled CPR manikin. Subjects were asked to upload CPR scores and a ‘Selfie’ upon completion of any practice chest compressions. Each institution’s scores and photos were displayed on an online leaderboard for 4 months during the Intervention phase, and were denied access into the leaderboard for 4 additional months for the Control phase. The order of the phases was randomized per institution. Outcome variables included mean number of CPR episodes per person and mean CPR performance score measured by the simulator. Independent t-tests compared outcome variables between the 2 phases for unadjusted and adjusted results based on treatment and crossover effects. Results: A total of 919 subjects performed 1850 CPR episodes during the study period. Unadjusted mean CPR episodes per subject was higher in Control phase than the Intervention phase (2.9 +/- 7.2 vs. 1.6 +/- 1.7, p<0.001). However, when controlling for a crossover effect, there was no difference in mean CPR episodes per subject between the Intervention (1.6 [95CI 1.4, 1.9]) and Control phase (1.7 [95CI 1.5, 2.0], p=0.6). No difference in mean CPR performance scores were found (90.7 [89.4, 92.0] vs 89.3 [87.6, 91.0], p=0.2). Conclusion: A competitive gamification system did not affect self-directed simulated CPR practice frequency or CPR performance.


Astrodynamics ◽  
2022 ◽  
Vol 6 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Jinchang Hu ◽  
Xiangyu Huang ◽  
Maodeng Li ◽  
Minwen Guo ◽  
Chao Xu ◽  
...  

AbstractThe entry vehicle for the Tianwen-1 mission successfully landed on the surface of Mars at 7:18 AM BJT on May 15, 2021. This successful landing made China the first country to orbit, land, and release a rover in their first attempt at the Mars exploration. The guidance, navigation, and control (GNC) system plays a crucial role in the entry, descent, and landing (EDL) phases. This study focused on the attitude control component of the GNC system design. The EDL phase can be divided into several sub-phases, namely the angle of attack control phase, lift control phase, parachute descent phase, and powered descent phase. Each sub-phase has unique attitude control requirements and challenges. This paper introduces the key aspects of designing attitude controllers for each phase. Furthermore, flight results are presented and analyzed.


2016 ◽  
Vol 50 (3) ◽  
pp. 325-330 ◽  
Author(s):  
M.C. Jordão ◽  
C.R.B. Alencar ◽  
I.M. Mesquita ◽  
M.A.R. Buzalaf ◽  
A.C. Magalhães ◽  
...  

The erosion-protective effect of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) is controversial. This study aimed to investigate the ability of CPP-ACP chewing gum to prevent a single event of erosive demineralization in situ. Bovine enamel blocks (n = 120) were randomly assigned to 3 phases according to the baseline surface hardness: phase I (PI) - chewing gum with CPP-ACP, phase II (PII) - chewing gum without CPP-ACP, and control phase (PIII) - salivary effect without stimulation (no gum). Nineteen volunteers participated in this study during 3 crossover phases of 2 h. In PI and PII, the volunteers wore intraoral palatal appliances for 120 min and chewed a unit of the corresponding chewing gum for the final 30 min. In the control phase the volunteers wore the appliance for 2 h, without chewing gum. Immediately after intraoral use, the appliances were extraorally immersed in a cola drink for 5 min to promote erosive demineralization. The percentage of surface hardness loss was calculated. The data were analyzed by ANOVA models and Tukey's test. Lower enamel hardness loss was found after the use of chewing gum with CPP-ACP (PI: 32.7%) and without CPP-ACP (PII: 33.5%) compared to the salivary effect without stimulation (PIII: 39.8%) (p < 0.05). There was no difference between PI and PII (p > 0.05). The results suggest that the use of chewing gum immediately before an erosive demineralization can diminish enamel hardness loss. However, the presence of CPP-ACP in the chewing gum cannot enhance this protective effect.


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