نتایج جستجو برای: since a long time ago
تعداد نتایج: 13850597 فیلتر نتایج به سال:
there has been a lot of development in the science of implantology since forty years ago when extensive research began on this field of science. the use of dental implantology has also increased in the last decade, which the main reason is the success of it. recently some of our colleagues participate in short time introductory and advanced courses of implant inside or outside the country and b...
Limitation of available water resources and crisis of water scarcity has been discussed in water conferences since a long time ago. In Iran’s climatic conditions, the most important problem for increasing agricultural production is limitation of available water resources. Drip irrigation methods are one of the suitable solutions for efficient use of water resources under a condition that ...
The relation between ethics and art is a problem drawn artists and philosophers’ attention to itself from a long time ago. Since ancient era, philosophers such as Plato and Aristotle paid much attention to possibility of ethical criticism of art and its influence on aesthetic aspect of artworks;and then in the latter periods, other philosophers and artists, such as Tolstoy, Hume and Kant, expre...
SUMMARY Palaeomagnetic field intensity measurements, derived from rocks with ages that span geological time, provide a crucial constraint on the evolution of Earth’s deep interior and its magnetic environment. The palaeointensity database PINT has been updated to version v.8.0.0 includes site-mean records spanning an interval 50 ka 4.2 Ga, compiling efforts palaeomagnetic community 1959 end 201...
degradation of zagros forests has been continuing since a long time ago because of traditional and often improper exploitations due to poverty, unemployment, and livelihood. in this study, in order to reduce forest degradation and improve sustainability, the feasibility of multipurpose using of zagros forest was assessed in baneh forests by using gis, rs and ahp. all of the possible land-uses a...
The Sahara is the largest hot desert on Earth. Yet timing of its inception and response to climatic forcing debated, leading uncertainty over causes consequences regional aridity. Here we present detailed records terrestrial inputs from Africa North Atlantic deep-sea sediments, documenting a long sustained history astronomically paced oscillations between humid arid 11 million years ago. We sho...
While there is no consensus about the history of time since the beginning, in this paper I will discuss some possibilities. We have a pretty clear picture of cosmic history from the electroweak phase transition through the time of recombination, a period which includes the QCD phase transition and big bang nucleosynthesis. This paper includes a quantitative discussion of the age of the universe...
Abstract. Employees include a main part of labour force in each country. This group is so important since a long time ago, International Labour Organization has allocated lots of its indicators such as decent work ones to the group. On the other hand, the employees in Iran are subject to the various employment laws that one of them is the labour law. According to the labour law, the Ministry of...
The influence of physical damping on the numerical stability of time integration analysis is an open question since decades ago. In this paper, it is shown that, under specific very general conditions, physical damping can be disregarded when studying the numerical stability. It is also shown that, provided the specific conditions are met, analysis of structural systems involved in extremely hi...
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