نتایج جستجو برای: degradation of environment
تعداد نتایج: 21204425 فیلتر نتایج به سال:
The relationship between democracy and environment has always been controversial. Some scientists found that democracy had a positive impact on reducing environmental disruption. Other scholars claimed that democracy tends to accelerate environmental degradation. Ther are many studies focusing on main determinants of environmental degradation. More recently, democracy is considered to be one of...
the main factors affecting environmental sensitivity to degradation are soil, vegetation, climate and management, through either their intrinsic characteristics or by their interaction on the landscape. different levels of degradation risks may be observed in response to particular combinations of the aforementioned factors. for instance, the combination of inappropriate management practices an...
abstract cooperative learning refers to small groups of learners working together as a team to solve a problem, complete a task, or accomplish a common goal. in a cooperative environment one’s success is directly related to the success of other members because the focus on the individual shifts towards the group. to test the effectiveness of the method, using jigsaw technique, a study was cond...
drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...
polyurethanes (purs) are polymers that can be generated by a step-growth polyadditionreaction of diisocyanates with polyols. the number of well-developed chemical procedures applicable to theirmanufacture, and the diversity of chemical structures in which polyurethanes can be built, account for thewidespread use of these materials in the last few decades for both domestic and technical applicat...
Introduction: A variety of pesticides is used to combat weeds. Check-resistant residues of contaminants in drinking water resources have detrimental effects on human health and on environment. In recent years, advanced oxidation methods o remove toxins from the environment, particularly the aquatic environment is further considered. Methods: In this study, samples adding different concentrat...
photocatalytic degradation of toxic organic compound in water, soil and air by semiconductor catalysts such as tio2 and zno have received much attention over the last two decades. however, the low quantum yield, easy agglomeration and difficult post-separation of these inorganic catalysts limit their application for large-scale applications. metal-organic frameworks (mofs) are the latest class ...
in recent years, degradation of environment (water and soil resources) by farmers has increase concerns about sustainability of agriculture. farmers’ behaviors affect conservation of these resources and play important role in sustainability of agriculture as well. shiraz county, like other parts of the country, suffers for degradation of soil and water resources. the aim of this study was to pr...
abstract: one of the most visited & important spaces in different countries by tourist are urban areas. the old tehran which major part is located in district 12 is historical showcase of the capital, but, its hiidden cultural attraction is not used as it should be. this thesis occasionally engage in studying the efficacy of correct installation of travel guide boards in welfare & easily acc...
background: since organophosphorus pesticides are widely used for industry and insect control in agricultural crops, their fate in the environment is very important. pesticide contamination of surface water has been recognized as a major contaminant in world because of their potential toxicity towards human and animals. the objective of this research was to investigate the influence of variou...
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