جستجوی مقالات مرتبط با کلیدواژه "essence" در نشریات گروه "جغرافیا"

Climatic condition is one of the most important determinants of the qualitative properties of essential oils produced by Rosa damascena Mill and play a decisive role in the quality of essential oil extracted from it. The main objective of this study is to investigate the comparison of the different composition of the essential oils in the present conditions and under climate changing conditions. In this study, data related to quantitiy features and Rosa damascena Mill essence composition value were sampled from 6 orchards and extracted in labratoary .8 main compositions –called Benzene, ethanol, citronellol, geraniol, eugenol, methyl eugenol, Heptadecane, Nonadkan, and Hnykozan were identified from extracted essence of these orchards. Finally, correlation analysis were used to revealing the association among climatic factors and extracted Essense composition of each orchard. The results showed that 8 extracted compositions formes more than average 0.88 of sampled flowers essence and generally Citronellol, geraniol and Nonadkan form the highest percent of essence. the results also showed that of 8 important compositions of Rosa damascena Mill. essence m changes in 4 compositions Nonadkan, benzene, ethanol and Geraniol and methyl eugenol meaningfully are dependant on space- changes in weather factors from March to June and specially April. concentration of two compositions Benzene, ethanol and methyl eugenol in all sampled orchards in simulated climate 2050 have increased from 2014. While concentration of two chemical compositions Nonadkan and Geraniol in 2050 had meaningfully decreased rather to 2014

In science of Logic, a science subject include thing that in this the science will be discussed of conditions and accidents the essential and it’s immediate. Accidents the essential to those attributes of things and phenomena is said that directly arises from the essence of the phenomenon or things and in its existence not need no intermediary. Though relying on the “subject” for the definition and classification of sciences contain of ancient and long history, but it should be noted that the application of this criteria is not effective for defining all the Sciences; because the definition a science based on subject, when possible that first, the science Intended been components the real sciences and phenomena under the study of Its, be eligible essence and characteristics (accidents) essential. Second, Sciences which are defined and classified based on the subject, at least have three basic characteristics that include: 1. their sentences and problems being universal 2. Being necessary the relations between subjects and predicates of their propositions 3. Being demonstrative. For this reason, those sciences which first their under investigation phenomena are unreal and secondly the above-mentioned three characteristics are lacking, cannot be based on the subject, defined. This category of science that are known as the "Credit Sciences", should be based on other criteria, including based on teleo and method, defined and categorized. In other words, the definition of the subject, merely special the real sciences is such as philosophy, logic and mathematics and does not include credit sciences such as the social sciences and including geography. And maintaining the integrity of the social sciences as well as geography through the teleo and its function, eligible reasonable benefits and offered more functionality of define subject is for these disciplines and can rescue this sciences of current philosophical the stagnation and crisis.
The present study due to the nature of philosophy and own logical, is among the fundamental and theoretical research. This study is based on descriptive and analytical method (logical) and its analysis is done based on logical reasoning and arguments. Therefore, discussions and matters from this series of documentaries and library are considered.
Result and Based on research conducted in the subject science of Geography, it can be said: geography is among the sciences without subject. Because the subject can be raised only in those sciences that phenomena and things of the study of those sciences, essence eligible and consequently, be essential characteristics eligible and this feature there is only the real science that them investigated phenomena independent of the will of man, are available. Accordingly, because Sciences unreality (Sciences credit) such as social sciences, such as geography, unreal phenomena and man-made (credit) they can read, that are lacks essence, cannot they Have an subject because the subject when have mean that first be essence in the work and secondly considered essential characteristics. Since the main field of the study science of Geography is considered to be credit phenomenon of space and we know Geographical space is phenomenon lacks essence and essential characteristics and therefore the science of geography which is engaged in the study of such phenomenon cannot be eligible subject.
Given that the subject a science include one thing in which science does discussion about the accidents and essential characteristics that, therefore objective Sciences are the sciences which the study of Its phenomena, to be essence eligible and then characteristics (accidents) essential. Also propositions these sciences, is universal, necessary and permanent and this sciences will be a demonstrational but geography because it phenomenon case the study of its (space and time) is lacks essence and statements It is personal therefore above features will not have. So of logical point of view, geography cannot be the subject and any attempt to define Geography objective this string will be faced with a logical contradiction. Since the geography is empirical, social, credit science and placed in rows Sciences practical and functional and has the nature of the problem solving not only need to have does not the subject but also thematic objective to geography, has been caused lack of dynamism and caught this knowledge in an identity crisis and philosophical. So to define of geography must has rely on its functional the nature because the definition of functional and teleo-oriented, for Geography will enhance authority and position and Its role in various fields of political, social, economic and macroeconomic planning development, planning and formulation of comprehensive national strategies and transnational over the current situation. It can therefore be defined Geography in terms of teleo and function in the form knowledge production and management space.