The minimum angle condition ford-simplices

Postmortem pathological examinations, animal studies, and anecdotal reports suggest that coronavirus disease 2019 (COVID-19) could potentially affect intraocular tissue. However, published evidence is scarce and conflicting. In our study, we screened 100 eyes of 50 patients hospitalized for COVID-19. Relevant medical and ophthalmological history was assessed as well as symptoms, laboratory results, specific treatments, clinical course, and outcome. Ophthalmic exams including assessment of best corrected visual acuity (BCVA), intraocular pressure (IOP), color perception, ocular motility, ophthalmoscopy as well as optical coherence tomography (OCT) of the macula and the optic disc was performed at hospital admission and 29 to 192 days later. Of the 50 patients included, 14 (28%) were female. Median age was 64.5 (range 29–90) years. COVID-19 severity was mild in 15 (30%), severe in 30 (60%), and critical in five cases (10%). At baseline, median BCVA was 0.1 (0–1.8) Logarithm of the Minimum Angle of Resolution (LogMAR) and median IOP was 16 (8–22) mmHg. At follow-up, no relevant changes in BCVA and IOP were documented. No signs of active intraocular inflammation or optic nerve affection were found and OCT findings were widely stable during the observation period. Our findings suggest that COVID-19 does not regularly affect intraocular tissue.

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Outcome of Corneal Collagen Crosslinking for Progressive Keratoconus in Paediatric Patients

BioMed Research International ◽

10.1155/2014/140461 ◽

2014 ◽

Vol 2014 ◽

pp. 1-5 ◽

Cited By ~ 14

Author(s):

Deepa Viswanathan ◽

Nikhil L. Kumar ◽

John J. Males

Keyword(s):

Young Patients ◽

Ultraviolet A ◽

Effective Treatment Option ◽

Collagen Crosslinking ◽

Paediatric Patients ◽

Corneal Grafting ◽

Minimum Angle ◽

Corneal Collagen Crosslinking ◽

The Mean ◽

Corneal Collagen

Purpose. To evaluate the efficacy of corneal collagen crosslinking for progressive keratoconus in paediatric patients.Methods. This prospective study included 25 eyes of 18 patients (aged 18 years or younger) who underwent collagen crosslinking performed using riboflavin and ultraviolet-A irradiation (370 nm, 3 mW/cm2, 30 min).Results. The mean patient age was 14.3 ± 2.4 years (range 8–17) and mean followup duration was 20.1 ± 14.25 months (range 6–48). Crosslinked eyes demonstrated a significant reduction of keratometry values. The mean baseline simulated keratometry values were 46.34 dioptres (D) in the flattest meridian and 50.06 D in the steepest meridian. At 20 months after crosslinking, the values were 45.67 D (P=0.03) and 49.34 D (P=0.005), respectively. The best spectacle corrected visual acuity (BSCVA) and topometric astigmatism improved after crosslinking. Mean logarithm of the minimum angle of resolution (logMAR) BSCVA decreased from 0.24 to 0.21 (P=0.89) and topometric astigmatism reduced from mean 3.50 D to 3.25 D (P=0.51).Conclusions. Collagen crosslinking using riboflavin and ultraviolet-A is an effective treatment option for progressive keratoconus in paediatric patients. Crosslinking stabilises the condition and, thus, reduces the need for corneal grafting in these young patients.

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Selection of single sampling variables plans based on the minimum angle

Journal of Applied Statistics ◽

10.1080/02664769723819 ◽

1997 ◽

Vol 24 (2) ◽

pp. 207-218 ◽

Cited By ~ 2

Author(s):

V. Soundararajan ◽

A. L. Christina

Keyword(s):

Minimum Angle ◽

Selection Of

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DESINGING DSP (0, 1) ACCEPTANCE SAMPLING PLANS BASED ON TRUNCATED LIFE TESTS UNDER VARIOUS DISTRIBUTIONS USING MINIMUM ANGLE METHOD

International Journal of Research in Engineering and Technology ◽

10.15623/ijret.2014.0301019 ◽

2014 ◽

Vol 03 (01) ◽

pp. 116-129

Author(s):

A.R.Sudamani Ramaswamy .

Keyword(s):

Acceptance Sampling ◽

Sampling Plans ◽

Acceptance Sampling Plans ◽

Minimum Angle ◽

Life Tests ◽

Angle Method

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Moving State Marine SINS Initial Alignment Based on High Degree CKF

Mathematical Problems in Engineering ◽

10.1155/2014/546107 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 8

Author(s):

Yong-Gang Zhang ◽

Yu-Long Huang ◽

Zhe-Min Wu ◽

Ning Li

Keyword(s):

Kalman Filter ◽

Unscented Kalman Filter ◽

Alignment Method ◽

Misalignment Angle ◽

Initial Alignment ◽

Central Difference ◽

Angle Condition ◽

Cubature Kalman Filter ◽

High Degree ◽

Central Difference Kalman Filter

A new moving state marine initial alignment method of strap-down inertial navigation system (SINS) is proposed based on high-degree cubature Kalman filter (CKF), which can capture higher order Taylor expansion terms of nonlinear alignment model than the existing third-degree CKF, unscented Kalman filter and central difference Kalman filter, and improve the accuracy of initial alignment under large heading misalignment angle condition. Simulation results show the efficiency and advantage of the proposed initial alignment method as compared with existing initial alignment methods for the moving state SINS initial alignment with large heading misalignment angle.

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Numerical and experimental analysis on the helicopter rotor dynamic load controlled by the actively trailing edge flap

Smart Materials and Structures ◽

10.1088/1361-665x/ac4ba9 ◽

2022 ◽

Author(s):

zixuan zhou ◽

Xiuchang Huang ◽

Jiajin Tian ◽

Hongxing Hua ◽

Ming Tang ◽

...

Keyword(s):

Dynamic Load ◽

Peak Load ◽

Angle Of Attack ◽

Helicopter Rotor ◽

Effective Control ◽

Aerodynamic Load ◽

Lattice Method ◽

Minimum Angle ◽

Free Wake ◽

Rotor Dynamic

Abstract Reducing the rotor dynamic load is an important issue to improve the performance and reliability of a helicopter. The control mechanism of the actively controlled flap on the rotor dynamic load is numerically and experimentally investigated by a 3-blade helicopter rotor in this paper. In the aero-elastic numerical approach, the complex motion of the rotor such as the stretching, bending, torsion and pitching of the blade including the deflection of the actively controlled flap (ACF) are all taken into consideration in the structural formulation. The aerodynamic solution adopted the vortex lattice method combining with the free wake model, in which the influence of ACF on the free wake and the aerodynamic load on the blade is taken into account as well. While the experimental method of measuring hub loads and acoustic was accomplished by a rotor rig in a wind tunnel. The result shows that the 3/rev ACF actuation can reduce the $3\omega$ hub load by more than 50\% at maximum, which is significantly better than the 4/rev control. While 4/rev has greater potential to reduce BVI loads than 3/rev with $\mu=0.15$. Further mechanistic analysis shows that by changing the phase difference between the dynamic load on the flap and the rest of the blade, the peak load on the whole blade can be improved, thus achieving effective control of the hub dynamic load, the flap reaches the minimum angle of attack at 90°-100° azimuth under best control condition; when the BVI load is perfectly controlled, the flap reaches the minimum angle of attack at 140° azimuth, and by changing the circulation of the wake, the intensity of blade vortex interaction in the advancing side is improved. Moreover, an interesting finding in the optimal control of noise and vibration is that an overlap point exist on the motion patterns of the flap with different frequencies.

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