Introduction: Eye injuries are common in sports and have the potential for major morbidity with sight threatening consequences. However, a small number of sports, such as soccer, rugby or hockey are responsible for mo...Introduction: Eye injuries are common in sports and have the potential for major morbidity with sight threatening consequences. However, a small number of sports, such as soccer, rugby or hockey are responsible for most injuries. To our knowledge, hula hoop penetrating eye injury is not described in literature. In this report, we present a case of an unusual eye injury caused by a hula hoop. Case presentation: A 17-year-old female was admitted as an urgent penetrating right eye injury caused by a hula hoop. Penetrating wound covered 2/3 of the cornea and was associated with iris prolapses and incarceration;iridodialysis of more than half of the circumference, and traumatic cataract. Her best corrected visual acuity of the right eye was “hand motion”. The second corneal wound in parallel with the first one was noticed while she was being treated surgically under general anesthesia. Iris was repositioned, anterior chamber was formed with the viscoelastic and wounds were repaired using 10-0 nylon sutures. Iridopexy was performed using straight needle 10-0 prolene, while standard cataract surgery with phacoemulsification and IOL implantation were done. The postoperative recovery was uneventful beside elevated intraocular pressure (TOD = 24 mmHg) that was treated successfully by topical beta blockers. Six months later, her best corrected visual acuity was 0.6 stenopeic, with evident linear corneal opacification and traumatic mydriasis. Conclusions: Although seemingly impossible, hula hooping can be dangerous to the eyes if practiced in incommodious areas and close to other people.展开更多
Rotation of a pair of wings was driven by the vertical harmonic motion of a pin inserted into the center hole of the wings.To elucidate the mechanism by which the rotational motion of the wings was excited,the relatio...Rotation of a pair of wings was driven by the vertical harmonic motion of a pin inserted into the center hole of the wings.To elucidate the mechanism by which the rotational motion of the wings was excited,the relationship between the wings and the pin was examined by tracking their motions using both displacement measurements and high-speed photography.The motion modes occurred in this study were categorized into five types:slipping,rolling,jumping(without eccentricity),jumping(with eccentricity),and non-rotation.In the case that the hole of the wings was located at a distance from the center of the wings,referred to as″with eccentricity,″the slipping,jumping(with eccentricity),and non-rotation modes resulted.The experimental results showed that the mechanism of the jumping(with eccentricity)was different from that of the other modes(slipping,rolling,jumping(without eccentricity)),which are well known to be driven by the periodical reaction of the wings against the vertical vibration of the pin.It was found that the jumping(with eccentricity)was driven by the non-periodical force with the collision between the wing hole and the pin.展开更多
This paper is an extract of the prologue to the book: New Paradigm in Physics—Theory of Dynamic Interactions [1], published by Gabriel Barceló. This summary describes the elements that constitute the characteris...This paper is an extract of the prologue to the book: New Paradigm in Physics—Theory of Dynamic Interactions [1], published by Gabriel Barceló. This summary describes the elements that constitute the characteristics of the Theory of Dynamic Interactions, and certain circumstances of it. The author recalls that the Theory of Dynamic Interactions arrives at unheard of conclusions which, even with the level of dissemination reached by this theory over recent years, have not been scientifically refuted.展开更多
文摘Introduction: Eye injuries are common in sports and have the potential for major morbidity with sight threatening consequences. However, a small number of sports, such as soccer, rugby or hockey are responsible for most injuries. To our knowledge, hula hoop penetrating eye injury is not described in literature. In this report, we present a case of an unusual eye injury caused by a hula hoop. Case presentation: A 17-year-old female was admitted as an urgent penetrating right eye injury caused by a hula hoop. Penetrating wound covered 2/3 of the cornea and was associated with iris prolapses and incarceration;iridodialysis of more than half of the circumference, and traumatic cataract. Her best corrected visual acuity of the right eye was “hand motion”. The second corneal wound in parallel with the first one was noticed while she was being treated surgically under general anesthesia. Iris was repositioned, anterior chamber was formed with the viscoelastic and wounds were repaired using 10-0 nylon sutures. Iridopexy was performed using straight needle 10-0 prolene, while standard cataract surgery with phacoemulsification and IOL implantation were done. The postoperative recovery was uneventful beside elevated intraocular pressure (TOD = 24 mmHg) that was treated successfully by topical beta blockers. Six months later, her best corrected visual acuity was 0.6 stenopeic, with evident linear corneal opacification and traumatic mydriasis. Conclusions: Although seemingly impossible, hula hooping can be dangerous to the eyes if practiced in incommodious areas and close to other people.
文摘Rotation of a pair of wings was driven by the vertical harmonic motion of a pin inserted into the center hole of the wings.To elucidate the mechanism by which the rotational motion of the wings was excited,the relationship between the wings and the pin was examined by tracking their motions using both displacement measurements and high-speed photography.The motion modes occurred in this study were categorized into five types:slipping,rolling,jumping(without eccentricity),jumping(with eccentricity),and non-rotation.In the case that the hole of the wings was located at a distance from the center of the wings,referred to as″with eccentricity,″the slipping,jumping(with eccentricity),and non-rotation modes resulted.The experimental results showed that the mechanism of the jumping(with eccentricity)was different from that of the other modes(slipping,rolling,jumping(without eccentricity)),which are well known to be driven by the periodical reaction of the wings against the vertical vibration of the pin.It was found that the jumping(with eccentricity)was driven by the non-periodical force with the collision between the wing hole and the pin.
文摘This paper is an extract of the prologue to the book: New Paradigm in Physics—Theory of Dynamic Interactions [1], published by Gabriel Barceló. This summary describes the elements that constitute the characteristics of the Theory of Dynamic Interactions, and certain circumstances of it. The author recalls that the Theory of Dynamic Interactions arrives at unheard of conclusions which, even with the level of dissemination reached by this theory over recent years, have not been scientifically refuted.
