نتایج جستجو برای: 1300 تا 1350
تعداد نتایج: 220381 فیلتر نتایج به سال:
In this article the ability of ultrahigh resolution ophthalmic optical coherence tomography (OCT) to image small choroidal blood vessels below the highly reflective and absorbing retinal pigment epithelium is demonstrated for the first time. A new light source (lambdac= 1050 nm, Deltalambda = 165 nm, Pout= 10 mW), based on a photonic crystal fiber pumped by a compact, self-starting Ti:Al2O3 las...
Malthusian conditions are a byword for stagnation. We argue that this view is wrong. Europe’s relative riches in 1700 are best understood as the result of Malthusian forces favoring high per capita output. Favorable shifts in mortality and fertility schedules were responsible. Incomes between 1300 and 1800 rose because of two related but distinct European “inventions”—a peculiar marriage patter...
The medieval Black Death (c. 1347-1351) was one of the most devastating epidemics in human history. It killed tens of millions of Europeans, and recent analyses have shown that the disease targeted elderly adults and individuals who had been previously exposed to physiological stressors. Following the epidemic, there were improvements in standards of living, particularly in dietary quality for ...
Ceramic oxides that have high-temperature capabilities can be deposited on the superalloy components in aero engines and diesel engines to advance engine efficiency and reduce fuel consumption. This paper aims to study doping effects of Dy(3+) and Y(3+)on the thermodynamic properties of ZrO2 synthesized via a sol-gel route for a better control of the stoichiometry, combined with molecular dynam...
طلتخملا رطيسملل ميمصت مدقي ثحبلا اذه نا LQR/H-infinity .ةدكؤملا ريغو تاريغتملا ةددعتم ةمظنلأل مت ةفلك ةلاد ىلع ادامتعا ةعجارلا ةيذغتلا ةلاح تباوثل ىلثملا ميقلا داجيا ضرغل يئيزجلا دشحلا ةيلثما ةقيرط مادختسا تاددحم نيب طيلخ نع ةرابع يه ةحرتقملا ةفلكلا ةلاد نا.ةحرتقم LQR و H-infinity حرتقملا رطيسملا نا. ريغتملا ةددعتم ةمظنلأا ضوعي نا ةياع ةءافكبو عيطتسي رطيسملا ةوق تابثا ضرغل .ةيدكؤملا مدع دوجوب ...
The study and monitoring offacial appearance is particularly important in the Jield of orthodontics and reconstructive maxillo-facial surgery. The introduction of new medical imaging techniques, such as X-ray computerized tomography (CT), has enabled surgery to be planned in three dimensions, compared with conventional methods using lateral and antero-posterior cephalographic images. Whilst it ...
Oxide Dispersion Strengthened (ODS) ferritic steel, a candidate material for fast reactor fuel cladding, has low thermal expansion, good conductivity, and excellent resistance to irradiation damage high temperature strength. The origin of the high-temperature strength lies in dispersion fine oxides. In this study, creep tests at 700°C or 750°C, which are close operating temperatures reactors, t...
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