نتایج جستجو برای: 1774
تعداد نتایج: 847 فیلتر نتایج به سال:
Human practices have had an impact on Mediterranean ecosystems for millennia, particularly through agricultural and pastoral activities. Since the mid-19th century, land-use abandonment has led to the expansion of shrubland and forest, especially in the mountainous areas of the northern Mediterranean basin. Knowledge of these factors is vital to understanding present forest patterns and predict...
We report on the identification of a new possible Isolated Neutron Star candidate in archival ROSAT observations. The source 1RXS J214303.7+065419, listed in the ROSAT Bright Survey as RBS 1774, is very soft, exhibits a thermal spectrum well fitted by a blackbody at T ∼ 90 eV and has a low column density, NH ∼ 5 × 10 20 cm −2. Catalogue searches revealed no known sources in other energy bands c...
As early as 1774, the application of ultrasound in animal world was noted by Italian naturalist Lazzaro Spallanzani, who discovered that bats move using ultrasonic waves [...]
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