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Greinar- HÍ: Síðast bætt við
Atriði 1141-1160 af 1808
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(Society of Exploration Geophysicists, 1993-07)Cross-borehole tomography suffers from a well-known problem of data incompleteness: the limited ray coverage dictated by the poor experimental geometry implies that certain features of the velocity field are not determined by the data. Construction of ... -
(American Geophysical Union (AGU), 1996-12-01)P‐to‐S conversions from the two primary discontinuities near 410 and 660 km depth (P410s and P660s phases) are evident in particle motions and receiver functions of teleseismic body waves recorded by broadband seismic stations in Iceland. The average ...
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(Hið íslenska náttúrufræðifélag, 1997)Heitur reitur er landsvæði sem einkennist af mikilli eldvirkni og jarðhita og stendur hátt yfir umhverfið. Ísland er einn af stærstu heitu reitum jarðar og gnæfir 2-4 km yfir venjulega hæð Norður-Atlantshafshryggjarins sem gengur í gegnum landið. Markmið ...
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(Public Library of Science (PLoS), 2019-02-26)Baleen whales face the challenge of finding patchily distributed food in the open ocean. Their relatively well-developed olfactory structures suggest that they could identify the specific odours given off by planktonic prey such as krill aggregations. ...
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(Public Library of Science (PLoS), 2019-02-05)Central place foraging theory (CPF) has been used to predict the optimal patch residence time for air-breathing marine predators in response to patch quality. Humpback whales (Megaptera novaeangliae) forage on densely aggregated prey, which may induce ...
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(Departmento de Publicaciones del CSIC, 2018-12-20)Discarding fish has been a part of the fisheries for centuries but it has been very difficult to monitor how much is discarded, especially in areas where it is an illegal activity. In this study the ecological and economic effects of discarding were ...
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(Elsevier BV, 2018-11)Icelandic waters are very productive and the fisheries are economically important for the Icelandic nation. The importance of the fisheries has led to progressive fisheries management and extensive monitoring of the ecosystem. However, fisheries ...
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(American Geophysical Union (AGU), 1993-04-10)The 170 km South Iceland Seismic Tomography (SIST) profile extends from the west and across the Mid‐Atlantic Ridge spreading center in the Western Volcanic Zone and continues obliquely through the transform zone (the South Iceland Seismic Zone) to the ...
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(European Network about Parents in Education, 2015)Students’ voices in research on parental involvement in schools are rather weak since many studies report only on opinions of parents and school personnel. This paper draws on findings from a study in 14 compulsory schools and uses data from ...
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(Georg Thieme Verlag KG, 2015-07-17)The genus Diphasiastrum includes at least 23 species distributed primarily across the northern temperate and subarctic areas of the world. These plants produce an array of lycopodium alkaloids, and some species such as Diphasiastrum complanatum have ...
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(Elsevier BV, 2019-04)The club moss family Lycopodiaceae produces a diverse array of bioactive lycopodium alkaloids (LAs). In particular, the alkaloid huperzine A (hupA) has grasped attention since it is a potent acetylcholinesterase inhibitor of medical interest in Alzheimer's ...
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(Georg Thieme Verlag KG, 2018-10-05)The alkaloids huperzine A and huperzine B were originally isolated from the Chinese club moss Huperzia serrata. They are known inhibitors of acetylcholinesterase, and especially huperzine A shows pharmaceutical potential for the treatment of Alzheimerʼs ...
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(MDPI AG, 2019-01-27)Neurodegenerative disorders, including Alzheimer’s disease, belong to the group of the most difficult and challenging conditions with very limited treatment options. Attempts to find new drugs in most cases fail at the clinical stage. New tactics to ...
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(Hugvísindastofnun Háskóla Íslands, 2018-09-05)Umfjöllun um undur og ógnir borgarsamfélagsins er að finna í rituðum heimildum af ýmsu tagi og frá öllum tímum. Hér birtist þýðing Ásdísar Rósu Magnúsdóttur á dagbókarbrotum frá París frá tímum hundrað ára stríðsins svokallaða, sem hófst árið 1337. Í ...
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(Hugvísindastofnun Háskóla Íslands, 2018-09-05)Einn þekktasti lofsöngur um höfuðborg Íslands, Reykjavík, er án efa kvæðið „Ó borg, mín borg“, eftir Vilhjálm frá Skáholti, sem Haukur Morthens gerði ódauðlegt um miðja síðustu öld. Til að veita því fjölmenningarlega samfélagi sem nú blómstrar á Íslandi ...
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(Hugvísindastofnun Háskóla Íslands, 2018-09-04)meðfylgjandi inngangsorðum er hugað að birtingarmyndum borga í sínum óendanlega margbreytileika. Fyrst er brugðið upp tilvitnunum í nýleg skrif lista- og fræðimanna hér á landi þar sem Reykjavík er skipað í öndvegi. Því næst er athyglinni beint að ...
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(Menntavísindasvið Háskóli Íslands, 2016)Athugun á niðurstöðum í stærðfræði í PISA-rannsókninni 2003 sýndi að árangur nemenda í tveimur stærstu skólunum var marktækt betri en í minni skólum. Sérstaklega var árangurinn slakur í skólum með 11–25 þátttakendur. Athugun á árangri í dönskum skólum ...
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(Menntavísindasvið Háskóli Íslands, 2016-12-31)Landspróf miðskóla sem inntökupróf í menntaskóla og kennaraskóla og síðar fleiri skóla var haldið á árunum 1946–1976. Prófað var í átta námsgreinum þar sem íslenska vó tvöfalt. Landsprófið var upphaflega grundvallað á reglugerð nr. 3/1937 um námsefni ...
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(IOP Publishing, 2018-05-31)We study the structure of the elementary excitations and their propagation in chiral hybrid structure, comprising an array of two-level systems (TLSs) coupled to a one-dimensional photonic waveguide. The chirality is achieved via spin-locking effect, ...
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(Wiley, 2018-02-13)Global warming is predicted to significantly alter species physiology, biotic interactions and thus ecosystem functioning, as a consequence of coexisting species exhibiting a wide range of thermal sensitivities. There is, however, a dearth of research ...
Atriði 1141-1160 af 1808