نتایج جستجو برای: c54
تعداد نتایج: 82 فیلتر نتایج به سال:
Fullerene is a cage-like carbon allotrope admitting vast range of applications. Some the important fullerenes are C54,C58,C60,C70,C74,C76,C78,C80C82,C84,C86,C90. The physical properties can be exhibited using degree-based topological indices. sum based geometric arithmetic index significant in this manner. atomic bond connectivity, Randic, first and second Zagreb indices well known We have dete...
We investigate the monetary policy of the Federal Reserve Board during six periods in US economic history 1959–2008. In particular, we examine the Fed’s response to changes in three guiding variables: inflation, π, unemployment, U, and industrial production, y, during periods with low and high economic stability. We identify separate responses for the Fed’s change in interest rate depending upo...
The objective of this work was to identify factors influencing cheese wear behaviors. Wear behaviors cheeses with different fat contents (40, 50, 52, and 54 FDM) were evaluated at normal forces (0.5 0.7 N), sliding speeds (30 50 mm/s), temperatures (5, 15, 25 °C) every 15 d up 60 d. All showed highest mass loss °C compared that 5 °C, while higher penetration depth observed °C. Impact force on t...
Recent reports have suggested that leprosy originated in Africa, extended to Asia and Europe, and arrived in the Americas during European colonization and the African slave trade. Due to colonization, the contemporary Colombian population is an admixture of Native-American, European and African ancestries. Because microorganisms are known to accompany humans during migrations, patterns of human...
Individual heterogeneity is an important source of variation in demand. Allowing for general heterogeneity is needed for correct welfare comparisons. We consider general heterogenous demand where preferences and linear budget sets are statistically independent. We find that the dimension of heterogeneity and the individual demand functions are not identified. We also find that the exact consume...
This paper takes a global, long‐run perspective on the recent debate about secular stagnation, which has so far mainly focused on the short term. The analysis is motivated by observing the interplay between the economic and demographic transition that has occurred in the developed world over the past 150 years. To the extent that high growth rates in the past have partly been the consequence of...
این مقاله درصدد پاسخ به این سؤال است که آیا سیاست های مالی انبساطی به صورت افزایش مخارج دولت و کاهش مالیات بر رشد اقتصادی در ایران به صورت خطی تأثیرگذار است یا غیرخطی؟ به این منظور، کارایی هر یک از برنامه های مذکور با به کارگیری دو الگوی خودرگرسیون برداری خطی و آستانه ای و اطلاعات سال های ۱۳۳۸ الی ۱۳۹۱ بررسی شده است. در این ارتباط، هنگام استفاده از الگوی آستانه ای، مشاهده های سال های مورد بررسی...
مکانیزاسیون با غلبه بر محدودیت های فنی و اقلیمی از یکسو و محدودیت های زمانی از سوی دیگر، امکان افزایش تولید بخش کشاورزی را میسرکرده است. از سوی دیگر چغندرقند به عنوان یکی از محصولات صنعتی بخش کشاورزی است که نقش مهمی را در تأمین قند و شکر مورد نیاز داخل کشور ایفا می کند. در این مطالعه، باهدف بررسی آثار رفاهی سیاست مکانیزاسیون چغندرقند، توابع عرضه و تقاضای چغندرقند با استفاده از رهیافت معادله های...
The title compound, C(11)H(13)NO(2)Si, is a low-temperature form of the previously reported room-temperature structure [Garcia et al. (1998 ▶). Acta Cryst. C54, 489-491]. At 298 K, the material crystallizes in the space group Pnma and occupies a crystallographic mirror plane, but at 100 K the space group changes to P2(1)2(1)2(1), the volume decreases by 5% and the mol-ecule distorts. The greate...
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