scholarly journals A late Holocene record of marine high-energy events along the Atlantic coast of Morocco: new evidences from the Tahaddart estuary

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Otmane Khalfaoui ◽  
Laurent Dezileau ◽  
Jean-Philippe Degeai ◽  
Maria Snoussi
Keyword(s):  
Late Holocene ◽  
Atlantic Coast ◽  
Storm Surges ◽  
High Energy ◽  
Economic Losses ◽  
Spanish Atlantic ◽  
Holocene Record ◽  
Geochemical Analyses ◽  
First Time

Abstract The Atlantic coast of Morocco has been exposed to marine submersion events from storm surges and tsunamis which have resulted in human and economic losses. The absence of long term records for these hazards makes it difficult to trace their behavior through time, which is the first step to prepare proactive adaptation strategies for events that may happen in the future. In this paper, we present a late Holocene record of marine submersion events along the Atlantic coast of Morocco using a 2.7 m sediment core sampled from the Tahaddart estuary. The sedimentological and geochemical analyses conducted on this geological archive showed a mud-dominated sequence with 14 allochthonous sandy layers (E1-E14) left by marine high-energy events. The deposition age of three layers (E1, E13 and E14) has been determined using conventional dating methods (210Pbex, 137Cs and 14C). The first layer, introduced as E1 seems to fit with the great Lisbon tsunami in 1755 CE (Common Era), an event dated for the first time along the Atlantic coast of Morocco. The other two layers, referred to as E13 and E14, were dated between 3464 and 2837 cal BP (calibrated years Before Present) and chronologically correlated with marine high-energy deposits found on the Spanish Atlantic coast. This correlation confirms the existence of another regional event around 3200 BP.

The Tahaddart estuary, NW of Morocco: evidence of marine submersion events during the last 3500 years 

2021 ◽  
Author(s):  
Otmane Khalfaoui ◽  
laurent Dezileau ◽  
Jean-Philippe Degeai ◽  
Maria Snoussi
Keyword(s):  
Late Holocene ◽  
Atlantic Coast ◽  
High Energy ◽  
Mitigation Strategies ◽  
Spatial And Temporal Variability ◽  
Progressive Change ◽  
Marine Facies ◽  
Set Up ◽  
Long Term Studies

<p>The Atlantic coast of Morocco has been confronted with several marine submersion events. Historically, some of them have resulted in significant economic and human damage, including the 1755 AD event (known as the tsunami of Lisbon). This indicates the need to implement adaptation and mitigation strategies, based on long-term studies of these extreme events to deduce their spatial and temporal variability. Using two cores (TAH17-1 and TAH17-3) collected from the Tahaddart estuary (NW of Morocco), this work aims to identify deposits, set up by these high energy events during the mid to late Holocene period. The sedimentological, geochemical and geochronological analyses carried out on these geological archives show two fining-upward sequences, indicating a progressive change from a purely sandy marine facies, between 6500 and 3500 BP, to another finer and more terrigenous one. The fine sedimentation, which has dominated in the estuary during the last 3500 years, has facilitated the recording of several marine submersion events in the form of isolated sandy layers. Chronological data have made it possible to date four deposits. Two (1-E1 and 3-E1) were put in place about 250 years ago, which corresponds, according to historical records, to the 1755 AD Lisbon tsunami. Two other deposits (1-E13 and 1-E14) are dated around 3200 BP and represent unknown submersion events on the Moroccan Atlantic coast.</p>

scholarly journals Reconstruction of past marine submersion events (storms and tsunamis) on the North Atlantic coast of Morocco

2019 ◽  
Author(s):  
Otmane Khalfaoui ◽  
Laurent Dezileau ◽  
Jean-Philippe Degeai ◽  
Maria Snoussi
Keyword(s):  
North Atlantic ◽  
Atlantic Coast ◽  
High Energy ◽  
Economic Losses ◽  
The North ◽  
The North Atlantic ◽  
The One ◽  
Sediment Layers ◽  
First Time ◽  
Common Era

Abstract. The North Atlantic coast of Morocco has been affected historically by marine submersion events resulting from both storms and tsunamis and causing human and economic losses. The development of proactive adaptation strategies requires the study of these events over centennial to millennial timescales. Using a 2.7 m sediment core sampled from the Tahaddart estuary, we have been able to reconstruct past marine submersion events on this coastal area of Morocco over the last 4000 years. The high-resolution sedimentological and geochemical analysis conducted on this core allows us to identify 14 sediment layers attributed to marine high-energy events. The core was dated with isotopic techniques (137Cs, 210Pbex, 14C) and the outcomes reveal that three sediment layers are in connection with two major historical marine submersion events. The first layer mentioned as E1 seems to fit with the great Lisbon tsunami in 1755 CE (Common Era), an event dated for the first time on the Atlantic coast of Morocco. The other two layers referred as E13 and E14 were dated between 3464 and 2837 cal BP and correlated with marine submersion deposits found on Spanish and Moroccan coasts, which confirms the existence of a major high-energy event (around 3200 BP) similar to the one in 1755 CE.

scholarly journals Active Surveillance of the Implantable Cardioverter-Defibrillator Registry for Defibrillator Lead Failures

2020 ◽  
Vol 13 (4) ◽  
Author(s):  
Frederic S. Resnic ◽  
Arjun Majithia ◽  
Sanket S. Dhruva ◽  
Henry Ssemaganda ◽  
Susan Robbins ◽  
...  
Keyword(s):  
Active Surveillance ◽  
Failure Rate ◽  
High Energy ◽  
Implantable Cardioverter Defibrillators ◽  
Lead Failure ◽  
Data Registry ◽  
Icd Leads ◽  
First Time ◽  
Cardioverter Defibrillators

Background: Several defibrillator leads have been recalled due to early lead failure leading to significant patient harm. Confirming the safety of contemporary defibrillator leads is essential to optimizing treatment for patients receiving implantable cardioverter-defibrillators (ICDs). We therefore sought to assess the comparative long-term safety of the 4 most commonly implanted ICD leads within the National Cardiovascular Data Registry ICD Registry. Methods and Results: A propensity-matched survival analysis of the ICD Registry was performed evaluating 4 contemporary ICD leads in patients receiving an ICD system for the first time. All patients in the ICD Registry aged ≥18 years who underwent an implant of an ICD between April 1, 2011 and March 31, 2016 were included. Monitoring of safety began with ICD implant and continued up to 5 years. A meaningful difference in ICD failure rate was defined as twice (or more) the lead failure rate observed in the propensity-matched comparator patients. Among the 374 132 patients who received a new ICD implant, no safety alerts were triggered for the primary safety end point of lead failure for any of the high energy leads studied. Estimated rates of freedom from lead failure at 5 years ranged from 97.7% to 98.9% for the 4 high-energy leads of interest. Conclusions: Though limited by incomplete long-term outcomes ascertainment, active surveillance of the ICD Registry suggests that there were no meaningful differences in the rate of ICD high-energy lead survival for the 4 most commonly used high-energy ICD leads.

The Application of Elevating Integrated Monitoring Device in the Coal Silo

2014 ◽  
Vol 529 ◽  
pp. 420-424
Author(s):  
Zhi Jun Song ◽  
Lei Wang ◽  
Ban Hua Li ◽  
Shu Fang Si ◽  
Dong Jin Dai
Keyword(s):  
Coal Seam ◽  
Spontaneous Combustion ◽  
Thermal Power ◽  
Economic Losses ◽  
Monitoring Device ◽  
Security Risks ◽  
Integrated Monitoring ◽  
Long Term Storage ◽  
First Time

The coal with spontaneous combustion tendency is prone to spontaneous combustion in the process of long-term storage, which has brought huge economic losses for the thermal power and has potential security risks as well. So monitoring the coal yard is necessary and valuable. Elevating integrated monitoring device is used to monitoring the spontaneous combustion of coal stored in the silo. The device fixed on the soil roof can monitoring coal temperature, alkane gases concentration and coal level between the soil roof and the surface of coal seam by timing lifting or moving close to the surface of coal seam, giving an alarm in the first time when an exception occurs.

scholarly journals VHE BL Lacs through the MAGIC glasses

2014 ◽  
Vol 10 (S313) ◽  
pp. 64-69
Author(s):  
Josefa Becerra González ◽  
Keyword(s):  
Optical Emission ◽  
Theoretical Models ◽  
High Energy ◽  
Bl Lac Objects ◽  
Individual Object ◽  
Bl Lac ◽  
Multi Wavelength ◽  
Very High Energy ◽  
First Time

AbstractIn this contribution an overview of the latest results on the study of BL Lac objects with the MAGIC telescopes at the very high energy (VHE, E>100 GeV) gamma-rays is presented. Three new VHE sources were detected during 2014, two BL Lac objects and the gravitational lensed blazar S3 0218+357. MAGIC detected very fast intra-night variability from IC 310. This detection points to smaller emitting regions than the event horizon, this is hard to be explained in the framework of the current theoretical models. The long term multi wavelength (MWL) study of the BL Lac PKS 1424+240 shows correlation between the radio and optical emission, pointing to a common origin. The MWL SED is not well fitted by a one-zone synchrotron-self Compton (SSC) model, but a two-zone SSC model can explain both, the MWL light curve and the SED. Spectral curvature has been found in the observed VHE spectrum from PG 1553+113. This is the first time that spectral curvature compatible with the EBL absorption is found in an individual object.

scholarly journals Watersiporidae (Bryozoa) in Iberian waters: an update on alien and native species

2019 ◽  
Vol 49 (6) ◽  
pp. 2735-2752
Author(s):  
Oscar Reverter-Gil ◽  
Javier Souto
Keyword(s):  
Native Species ◽  
Atlantic Coast ◽  
Species Level ◽  
Shallow Waters ◽  
Gulf Of Cadiz ◽  
Historical Collections ◽  
Bibliographic Data ◽  
Gulf Of Cádiz ◽  
Spanish Atlantic ◽  
First Time

AbstractSpecies of the genus Watersipora comprise an important invasive fouling group but are difficult to identify up to species level. This problem, in conjunction with the recent re-description of several member species, requires the revision of previous records and newly collected material in order to more precisely determine their actual presence and distribution. Here, we revise the identity and distribution of alien and native species of Watersiporidae in Iberian waters based on newly collected material, historical collections, and bibliographic data. Four species of Watersipora are now known from here. Watersipora cucullata is the only native species, present in the Spanish Mediterranean. Watersipora subatra seems to have been introduced relatively recently in Iberian and European Atlantic waters and has been expanding to other Atlantic localities. Watersipora arcuata was collected for the first time in Europe at the SW Spanish Atlantic coast in 1990 and recently in Mediterranean marinas. Watersipora souleorum is known in Iberian waters from two localities in the Gulf of Cadiz and in Gibraltar. With the recent redescription of the genus Watersipora, W. complanata is no longer a member. A new watersiporid genus, Terwasipora gen. nov., is described for this species. In Iberian waters, T. complanata comb. nov. is considered a native species, frequent and abundant in shallow waters along the Atlantic coast.

scholarly journals Pseudoleria pectinata (Loew, 1872) – a new genus and species of heleomyzid fly introduced into the European fauna (Diptera: Heleomyzidae)

2020 ◽  
Author(s):  
Andrzej J. Woźnica
Keyword(s):  
Citizen Science ◽  
New Genus ◽  
Atlantic Coast ◽  
Female Specimen ◽  
New Genus And Species ◽  
Diagnostic Features ◽  
Identification Process ◽  
Spanish Atlantic ◽  
First Time

One female specimen of Pseudoleria pectinata (LOEW, 1872) was identified from photos taken at the Spanish Atlantic coast by Antonio J. PIZARRO MÉNDEZ, an amateur biologist. The species was observed in nature, in Rota, Spain, on 6th December 2019, and after detailed identification process, it was recorded for the first time in Europe. The pictures concerning the Pseudoleria pectinata specimen and the diagnostic features are presented. A discussion concerning the utilization of citizen science to help monitor invasive or introduced animals is included.

scholarly journals Chronology of Holocene storm events along the European Atlantic coast

2018 ◽  
Vol 42 (4) ◽  
pp. 431-450 ◽  
Author(s):  
Pierre Pouzet ◽  
Mohamed Maanan ◽  
Natalia Piotrowska ◽  
Agnès Baltzer ◽  
Pierre Stéphan ◽  
...  
Keyword(s):  
Northern Hemisphere ◽  
Radiocarbon Dating ◽  
Late Holocene ◽  
Energy Deposition ◽  
Atlantic Coast ◽  
High Energy ◽  
Storm Events ◽  
Before Present ◽  
Transport Activity ◽  
Global Cooling

This paper reviews the reconstruction of European Atlantic storm events with the contribution of a new stormy reconstruction in its central part. Three marsh environments on the island of Yeu were chosen to identify disturbing storm events from the Mid- to Late Holocene with vibracore sampling, radiocarbon dating and sedimentary analysis. Nine probable intervals of high energy deposition in these low-transport-activity environments are estimated: 600–500, near 1590, 2100–1950, 2850–2350, 3500–3270, 5400–5370, 6650–6510, near 7000 and between 7670 and 7470 calibrated years before present (cal y BP). By comparison with sedimentological paleostorm studies, we confirm six European Atlantic storm events estimated at near 600–300, 1700–1100, 2900–2500, 3500–3300, 5500–5100 and 7700–7100 cal y BP, corresponding to worldwide Holocene cooling climatic periods. A comparison with other storminess reviews of worldwide main stormy coasts shows that Holocene storms can increase during global cooling periods in the northern hemisphere.

1554: 6 Year Long Term Clinical and Urodynamical Outcome and Retreatment Rates of High Energy Transurethral Microwave Thermotherapy: Multicenter European Pooled Analysis

2004 ◽  
Vol 171 (4S) ◽  
pp. 410-410
Author(s):  
Christian Seitz ◽  
Bob Djavan ◽  
Michael Dobrovits ◽  
Matthias Waldert ◽  
Saeid Alavi ◽  
...  
Keyword(s):  
High Energy ◽  
Pooled Analysis ◽  
Transurethral Microwave Thermotherapy

Somatic Embryogenesis and In vitro Plant Regeneration in Vigna trilobata (L.) Verd. - A Potential Pasture Legume

1970 ◽  
Vol 19 (1) ◽  
pp. 89-99
Author(s):  
K. Choudhary ◽  
M. Singh ◽  
M. S. Rathore ◽  
N. S. Shekhawat
Keyword(s):  
Somatic Embryogenesis ◽  
Growth Regulators ◽  
Somatic Embryos ◽  
Basal Medium ◽  
Long Term Study ◽  
Continuous Application ◽  
First Time ◽  
Pasture Legume

This long term study demonstrates for the first time that it is possible to propagate embryogenic Vigna trilobata and to subsequently initiate the differentiation of embryos into complete plantlets. Initiation of callus was possible on 2,4-D. Somatic embryos differentiated on modified MS basal nutrient medium with 1.0 mg/l  of 2,4-D and 0.5 mg/l  of Kn. Sustained cell division resulted in globular and heart shape stages of somatic embryos. Transfer of embryos on to a fresh modified MS basal medium with 0.5 mg/l of Kn and 0.5 mg/l of GA3 helped them to attain maturation and germination. However, the propagation of cells, as well as the differentiation of embryos, were inhibited by a continuous application of these growth regulators. For this reason, a long period on medium lacking these growth regulators was necessary before the differentiation of embryos occurred again. The consequences for improving the propagation of embryogenic cultures in Vigna species are discussed. Key words: Pasture  legume, Vigna trilobata, Globular, Heart shape, somatic embryogenesis D.O.I. 10.3329/ptcb.v19i1.4990 Plant Tissue Cult. & Biotech. 19(1): 89-99, 2009 (June)

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