Search results for "Rift"
showing 10 items of 526 documents
Sedimentation in a fluvially infilling, barrier-bound estuary on a wave-dominated, microtidal coast: the Oueme River estuary, Benin, west Africa
2002
The Oueme River estuary is located on the seasonally humid tropical coast of Benin, west Africa. A striking feature of this microtidal estuary is the presence of a large sand barrier bounding a 120 km2 circular central basin, Lake Nokoue, that is being infilled by heterogeneous fluvial deposits supplied by a relatively large catchment (50 000 km2). Borehole cores from the lower estuary show basal Pleistocene lowstand alluvial sediments overlain by Holocene transgressive–highstand lagoonal mud and by transgressive to probably early highstand tidal inlet and flood-tidal delta sand deposited in association with non-preserved transgressive sand barriers. The change in estuary-mouth sedimentatio…
Sedimentation in a tropical, microtidal, wave-dominated coastal-plain estuary
1996
The Mono estuary is an infilled, microtidal estuary located on the wave-dominated Bight of Benin coast which is subject to very strong eastward longshore drift. The estuarine fill comprises a thick unit of lagoonal mud deposited in a ‘central basin’between upland fluvial deposits and estuary-mouth wave-tide deposits. This lagoonal fill is capped by organic-rich tidal flat mud. In addition to tidal flat mud, the superficial facies overlying the ‘central basin’fill include remnants of spits resting on transgressive/washover sand, an estuary-mouth association of beach, shoreface, flood-tidal delta and tidal inlet deposits, and a thin sheet of fluvial sediments deposited over tidal flat mud. Af…
A resource-based view of green innovation as a strategic firm resource: Present status and future directions
2021
Green innovation could become a valuable firm resource for establishing competitive advantage while simultaneously contributing towards sustainable development; in other words, green innovation has the potential to address the dilemma between consuming available resources and preserving them for the future. However, there is a dearth of studies systematically examining the present structure and future scope of research on green innovation as a firm resource. Seeking to explain the sustainable development dilemma of green innovations through the theoretical perspective of the resource-based view of the firm, we address this gap with a comprehensive bibliometric analysis of 951 relevant artic…
Muntlig och skriftlig feedback på gymnasienivå : en fallstudie
2016
Opettajan antamalla palautteella on keskeinen rooli opetuksessa, sillä sen avulla oppilas saa tietää, miten hän etenee omassa oppimisprosessissansa. Lisäksi palautteella on vaikutus oppilaan motivaatioon ja itsetuntoon. Tämän tutkimuksen tavoitteena oli selvittää, miten lukiolaiset haluavat saada suullista ja kirjallista palautetta ruotsin ja englannin opetuksessa. Tarkastelin myös, miten opettajat antavat palautetta oppilaillensa ja onko kielten välissä havaittavissa mitään eroja. Tutkimusaineistoni muodostui 45 lukiolaisesta ja kahdesta opettajasta. Observoin kolme tuntia ruotsin opetusta ja kolme tuntia englannin opetusta, minkä jälkeen sekä lukiolaiset että opettajat vastasivat kyselyyn…
Svensklärarnas skrivundervisning på gymnasienivå
2013
Tämän tutkielman tarkoituksena oli kartoittaa, millaisia kirjoittamistehtäviä ja työskentelytapoja lukion ruotsinopettajat käyttävät opettaessaan kirjoittamista, sekä selvittää, ovatko opettajat huomanneet joidenkin tehtävätyyppien tai työtapojen olevan oppimisen kannalta tehokkaampia kuin toisten. Tarkoituksena oli myös saada selville, eriyttävätkö opettajat kirjoittamisen opetusta sekä kuinka paljon ylioppilaskirjoitukset vaikuttavat opetukseen. Tutkielma toteutettiin kyselytutkimuksena, ja sen aineistona olivat 19 ruotsinopettajan kyselylomakevastaukset, jotka kerättiin joulukuun 2012 aikana Suomen Ruotsinopettajien liiton sähköpostilistan kautta. Kyselykaavake sisälsi kahdeksan väittämä…
Combining population genomics with demographic analyses highlights habitat patchiness and larval dispersal as determinants of connectivity in coastal…
2022
Gene flow shapes spatial genetic structure and the potential for local adaptation. Among marine animals with nonmigratory adults, the presence or absence of a pelagic larval stage is thought to be a key determinant in shaping gene flow and the genetic structure of populations. In addition, the spatial distribution of suitable habitats is expected to influence the distribution of biological populations and their connectivity patterns. We used whole genome sequencing to study demographic history and reduced representation (double-digest restriction associated DNA) sequencing data to analyse spatial genetic structure in broadnosed pipefish (Syngnathus typhle). Its main habitat is eelgrass beds…
Minimum detection limits and applications of proton and helium induced X-ray emission using transition-edge sensor array
2017
Abstract We have determined minimum detection limits, MDLs, for elements 14 ⩽ Z ⩽ 86 using a transition-edge sensor array, TES array, and as a comparison using an Amptek X-123SDD silicon drift detector, SDD. This was done using a 3 MeV proton beam and a 5.1 MeV helium beam. MDLs were determined for a thin film sample on top of C substrate, and for a bulk sample containing mostly Al. Due to the higher peak-to-background ratio, lower detection limits were obtainable using the TES array for most of the elements. However, for elements 30 ⩽ Z ⩽ 45 the performance of the TES array was not as good as the SDD performance. This is due to the limitations of the TES used at energies >10 keV. The great…
The Coupled Magmatic and Hydrothermal Systems of the Restless Aluto Caldera, Ethiopia
2020
Seismicity can be used to better understand interactions between magma bodies, hydrothermal systems and their host rocks—key factors influencing volcanic unrest. Here, we use earthquake data to image, for the first time, the seismic velocity structure beneath Aluto, a deforming volcano in the Main Ethiopian Rift. Traveltime tomography is used to jointly relocate seismicity and image 3D P- and S-wave velocity structures and the ratio between them (V P/V S). At depths of 4–9 km, the seismicity maps the top of a large low velocity zone with high V P/V S, which we interpret as a more ductile and melt-bearing region. A shallow (<3 km) hydrothermal system exhibits low seismic velocities and ve…
Hej Maria Svensson! Hur inleder och avslutar förstaårssstudenter i svenska sina e-brev?
2011
Tutkielmani tarkoitus oli selvittää, miten ensimmäisen vuoden ruotsin pääaineopiskelijat käyttävät tervehdysfraaseja ja ilmaisevat muita henkilökohtaiselle kirjeelle tyypillisiä kulttuurisidonnaisia konventioita erilaisissa sähköpostiviesteissä. Lisäksi tarkastelin, ovatko opiskelijoiden käyttämät fraasit sopivia kyseisessä kontekstissa ja aiheuttaako sopivan ilmauksen valitseminen ongelmia. Tutkimuksessani analysoin aineistoa sekä kvantitatiivisin että kvalitatiivisin menetelmin. Materiaalina tutkimuksessani oli Topling-projektin yhteydessä syksyllä 2010 kerätty aineisto, joka koostui 69 sähköpostiviestistä. Opiskelijoiden tehtävänä oli kirjoittaa sähköpostiviesti ruotsinkieliselle ystäväl…
Coupling dynamic simulation and interactive multiobjective optimization for complex problems: An APROS-NIMBUS case study
2014
Dynamic process simulators for plant-wide process simulation and multiobjective optimization tools can be used by industries as a means to cut costs and enhance profitability. Specifically, dynamic process simulators are useful in the process plant design phase, as they provide several benefits such as savings in time and costs. On the other hand, multiobjective optimization tools are useful in obtaining the best possible process designs when multiple conflicting objectives are to be optimized simultaneously. Here we concentrate on interactive multiobjective optimization. When multiobjective optimization methods are used in process design, they need an access to dynamic process simulators, …