نتایج جستجو برای: تبخیر گرمائی فیزیکی pvd

تعداد نتایج: 32773  

Journal: :Journal of cataract and refractive surgery 2009
Alireza Mirshahi Fabian Höhn Katrin Lorenz Lars-Olof Hattenbach

PURPOSE To report the incidence of posterior vitreous detachment (PVD) after uneventful state-of-the-art small-incision phacoemulsification with implantation of a posterior chamber intraocular lens (PC IOL). SETTING Department of Ophthalmology, Ludwigshafen Hospital, Ludwigshafen, Germany. METHODS This prospective study evaluated the vitreous status of eyes by biomicroscopic examination, in...

Journal: :European journal of ophthalmology 2009
Fabian Höhn Alireza Mirshahi Lars-Olof Hattenbach

PURPOSE To assess optical coherence tomography (OCT) for diagnosing posterior vitreous detachment (PVD) at the macular region compared to kinetic B-scan ultrasonography. METHODS In the present study, the authors prospectively investigated the frequency of PVD at the posterior pole utilizing ocular kinetic B-mode sonography in 315 eyes of 188 patients (113 female, 75 male; mean age, 72.8 years...

Journal: :Molecular medicine 2008
Yanxia Liu Nannan Li Li You Xin Liu Hongyan Li Xin Wang

Endothelial cell injury and activation in the placenta are features of placental vascular disease (PVD). While advances in PVD have been made, the pathogenesis of this disease is still unknown. The objective of this study was to pursue potential risk factors and signal transcription pathways involved in PVD pathogenesis. Gene expression in subjects with PVD and with normal pregnancies was compa...

Journal: :American journal of ophthalmology 2006
Jean Y Chuo Tracy Y Y Lee Hussein Hollands Andrew H Morris Romina C Reyes Jonathan D Rossiter Sarah P Meredith David A L Maberley

PURPOSE To identify possible risk factors for the development of posterior vitreous detachment (PVD). DESIGN Retrospective case-control study. METHODS A total of 138 cases with PVD and 114 age-matched controls were accrued from two different sites. Demographic, medical, ocular, and lifestyle data were obtained through chart review, questionnaires, and clinical examination. A 108-item semiqu...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده مهندسی مواد 1385

اعمال پوشش های نازکی از فلزات نرم بین سطوح لغزشی به دلیل استحکام برشی و سختی کم موجب روانی حرکت می شود. در این پژوهش برای ایجاد پوشش های روانکار جامد از ایندیم و سرب رور نمونه های فولادی استفاده شد. پوشش دهی به روش رسوب فیزیکی بخار (pvd) و توسط فرایندهای تبخیر در خلاء و رسوب یونی صورت گرفت و تاثیر پارامترهای فرایند شامل دمای زیر لایه، فشار گاز محفظه و ولتاژ اعمالی بر رفتار تریبولوژیکی، بافت و م...

Journal: :The British journal of ophthalmology 2004
C R Gonzales A Gupta S D Schwartz A E Kreiger

BACKGROUND Primary phakic rhegmatogenous retinal detachment (RRD) without posterior vitreous detachment (PVD) represents a unique clinical entity that behaves differently from RRD associated with PVD. While previous studies have reported the long term findings in the fellow eye of patients with RRD and PVD, the outcome of the fellow eye of patients with RRD without PVD is not known. METHODS C...

Journal: :Circulation. Arrhythmia and electrophysiology 2017
Ryohsuke Narui Michifumi Tokuda Masato Matsushima Ryota Isogai Kenichi Tokutake Kenichi Yokoyama Mika Hioki Keiichi Ito Shin-Ichi Tanigawa Seigo Yamashita Keiichi Inada Kenri Shibayama Seiichiro Matsuo Satoru Miyanaga Kenichi Sugimoto Michihiro Yoshimura Teiichi Yamane

BACKGROUND In contrast with traditional radiofrequency ablation, little is known about the influence of cryoballoon ablation on the morphology of pulmonary veins (PVs). We evaluated the influence of cryoballoon ablation on the PV dimension (PVD) and investigated the factors associated with a reduction of the PVD. METHODS AND RESULTS Seventy-four patients who underwent cryoballoon ablation for...

2015
Masaoki Wada Taro Takeshima Yosikazu Nakamura Shoichiro Nagasaka Toyomi Kamesaki Hiroshi Oki Eiji Kajii

OBJECTIVE Dizziness and vertigo are highly prevalent symptoms among patients presenting at primary care clinics, and peripheral vestibular disorder (PVD) is their most frequent cause. However, the incidence of PVD has not been well documented. This study aimed to investigate the incidence of dizziness, vertigo, and PVD among patients presenting at a primary care clinic. DESIGN This was an obs...

2011
Mikiko Takezawa Fumihiko Toyoda Chiho Kambara Hiroko Yamagami Akihiro Kakehashi

BACKGROUND To clarify the mechanism of idiopathic macular hole development, we evaluated the vitreoretinal relationship in fellow eyes of those with a macular hole and normal eyes using spectral-domain optical coherence tomography. Thirty-one fellow eyes and 34 normal volunteer eyes without a posterior vitreous detachment (PVD) were included. RESULTS WE CLASSIFIED SIX VITREOMACULAR RELATIONSH...

ژورنال: :فیزیک اتمی و مولکولی 0

در این تحقیق، طراحی و ساخت قطبشگر برای هماهنگ دوم لیزر nd:yag  انجام شد. این قطبشگر کاربردهای فراوانی مانند مشخصه یابی  قطعات غیرخطی دارد. از لایه نشانی چندگانه جهت بهینه سازی تراگسیل مؤلفه p  و بالا بردن انعکاس مؤلفه s به روش انباشت فیزیکی در خلاء(pvd)   استفاده شد.سپس با استفاده از طیف سنجی درصد تراگسیل مؤلفه p  قطبشگر ساخته شده 4/96 و درصد انعکاس مؤلفه s،  47/2   بدست آمد..

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