نتایج جستجو برای: a historical review
تعداد نتایج: 13610480 فیلتر نتایج به سال:
Piezoelectric transformers (PTs) are solid-state devices that transform electrical energy into electrical energy by means of a mechanical vibration. These devices are manufactured using piezoelectric materials that are driven at resonance. With appropriate design and circuitry, it is possible to step up and step down the voltages between the input and output sections of the piezoelectric transf...
Early attempts at spinal arthroplasty in the 1950s yielded limited success. A revival of this procedure occurred in the 1980s and became a realistic treatment option in the 1990s. Both lumbar and cervical arthroplasties have been introduced in the US since 2000 for randomized, prospective studies in accordance with the Food and Drug Administration (FDA) investigational device exemption provisio...
The study of thrombopoiesis has evolved greatly since an era when platelets were termed "the dust of the blood," only about 100 years ago. During this time megakaryocytes were identified as the origin of blood platelets; marrow-derived megakaryocytic progenitor cells were functionally defined and then purified; and the primary regulator of the process, thrombopoietin, was cloned and characteriz...
axes), one can construct a curved surface on which any point would be focused or mapped to precisely corresponding points on the two re t i n a s . This surface is the horopter, often simplified as a curved line in the horizontal plane (Figure 3-2). For example, a point 4 degrees to the right of fixation on the horopter would be imaged on each retina precisely four degrees to the left of each f...
This paper reviews one of the main controversies in public policy, the concept of city competitiveness and how it responds to the issue of urban decline, accentuating the contribution of urban regeneration to competitiveness of cities through theoretical and case study review (Mashhad’s central historical urban fabrics). Following a review of four main urban regeneration themes within the condi...
Quarter Boundary in Historical Fabrics of Iranian Cities Case Study: Ali Gholi Agha Quarter, Isfahan
The boundary of quarter is among the subjects that have been widely addressed in urban planning and urban design research. Clearly, several studies have examined the issue of “quarter boundaries in the historical fabric of Iranian cities”, but the literature review shows that there are still ambiguities in this regard. There are two contradictory answers to this issue: one group of studies ...
from historical facts to geo-political realities: relation between turkey and armenia ( 1915 – 2010)
armenias geopolitics and its historical experience have had a determining impact on the character of its foreign policy .present-day armenia is a small, landlocked country with _11,620 square miles area armenias landlocked nature makes it dependent on the benevolence of its neighbors for access to the outside world a fact that gives it a sense of isolation and vulnerability. as it was indic...
Today, the importance and special position of the historical texture and buildings in the city is completely obvious. However, the issue of protecting, supporting and restoring historical texture and valuable historical buildings in Iran is not seriously, scientifically and legally pursued by top level of management and popular demand. Historical texture and buildings are increasingly in danger...
Abstract The Holy quran has repeatedly mentioned zakat.Since these verses have been revealed in a historical contex chronologically studying of the decsent of the Quranic verses and cosidering the events and the audience of the Age of descent proves that theGod has followed a rational plan to establish the institution of zakat. in the first stage in mecca God initially invites you to pay Za...
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