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"Canto, A"
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بيل كانتو : الرهينة
الرواية بها حبكة درامية مشوقة ومثيرة وإسقاطات سياسية لاذعة. تدور الأحداث حول صاحب أكبر مصانع إلكترونيات في اليابان، عندما تلقى دعوة من إحدى الدول الصغيرة في أميركا الجنوبية، وكان الغرض في الظاهر هو الاحتفاء به والاحتفال بعيد ميلاده، ولكن الغرض الحقيقي كان خبيثا، حيث تريد هذه الدولة استغلال الرجل بأي شكل حتى يستثمر ويعين الاقتصاد ويرتفع بالدولة. وفرت هذه الدولة كل الإغراءات الممكنة من أجل جذب الرجل وإقناعه بطرق مباشرة وغير مباشرة، تعاقدت الدولة مع مغنية الأوبرا روكسان كوكس، والتي يحلم أي أحد على وجه الأرض أن ينظر إليها من بعيد.
Book
Exploring the capture and desorption of CO2 on graphene oxide foams supported by computational calculations
In the last decade, the highest levels of greenhouse gases (GHG) in the atmosphere have been recorded, with carbon dioxide (CO
2
) being one of the GHGs that most concerns mankind due to the rate at which it is generated on the planet. Given its long time of permanence in the atmosphere (between 100 to 150 years); this has deployed research in the scientific field focused on the absorption and desorption of CO
2
in the atmosphere. This work presents the study of CO
2
adsorption employing materials based on graphene oxide (GO), such as GO foams with different oxidation percentages (3.00%, 5.25%, and 9.00%) in their structure, obtained via an environmentally friendly method. The characterization of CO
2
adsorption was carried out in a closed system, within which were placed the GO foams and other CO
2
adsorbent materials (zeolite and silica gel). Through a controlled chemical reaction, production of CO
2
was conducted to obtain CO
2
concentration curves inside the system and calculate from these the efficiency, obtained between 86.28 and 92.20%, yield between 60.10 and 99.50%, and effectiveness of CO
2
adsorption of the materials under study. The results obtained suggest that GO foams are a promising material for carbon capture and the future development of a new clean technology, given their highest CO
2
adsorption efficiency and yield.
Journal Article
Micro-organisms behind the pollination scenes: microbial imprint on floral nectar sugar variation in a tropical plant community
Background and AimsVariation in the composition of floral nectar reflects intrinsic plant characteristics as well as the action of extrinsic factors. Micro-organisms, particularly yeasts, represent one extrinsic factor that inhabit the nectar of animal-pollinated flowers worldwide. In this study a ‘microbial imprint hypothesis’ is formulated and tested, in which it is proposed that natural community-wide variation in nectar sugar composition will partly depend on the presence of yeasts in flowers.MethodsOccurrence and density of yeasts were studied microscopically in single-flower nectar samples of 22 animal-pollinated species from coastal xeric and sub-humid tropical habitats of the Yucatán Peninsula, Mexico. Nectar sugar concentration and composition were concurrently determined on the same samples using high-performance liquid chromatography (HPLC) methods.Key ResultsMicroscopical examination of nectar samples revealed the presence of yeasts in nearly all plant species (21 out of 22 species) and in about half of the samples examined (51·8 % of total, all species combined). Plant species and individuals differed significantly in nectar sugar concentration and composition, and also in the incidence of nectar yeasts. After statistically controlling for differences between plant species and individuals, nectar yeasts still accounted for a significant fraction of community-wide variance in all nectar sugar parameters considered. Significant yeast × species interactions on sugar parameters revealed that plant species differed in the nectar sugar correlates of variation in yeast incidence.ConclusionsThe results support the hypothesis that nectar yeasts impose a detectable imprint on community-wide variation in nectar sugar composition and concentration. Since nectar sugar features influence pollinator attraction and plant reproduction, future nectar studies should control for yeast presence and examine the extent to which microbial signatures on nectar characteristics ultimately have some influence on pollination services in plant communities.
Journal Article
Measurement of the absolute efficiency of the X-ARAPUCA photon detector for the DUNE Far Detector 1
The DUNE far detector has been designed to detect photons and electrons generated by the charged products of the interaction of neutrinos with a massive liquid argon (LAr) target. The photon detection system (PDS) of the first DUNE far detector (FD1) is composed of 6000 photon detection units, named
X-ARAPUCA
. The detection of the prompt light pulse generated by the particle energy release in LAr will complement and boost the DUNE LAr Time Projection Chamber. It will improve the non-beam events tagging and enable at low energies the trigger and the calorimetry of the supernova neutrinos. The X-ARAPUCA is an assembly of several components. Its photon detection efficiency (PDE) depends on the design of the assembly, on the grade of the individual components and on their coupling. The X-ARAPUCA PDE is one of the leading parameters for the PDS sensitivity, that in turn determines the sensitivity of the DUNE for the detection of core-collapse supernova within the galaxy and for nucleon decay searches. In this work we present the final assessment of the absolute PDE of the FD1 X-ARAPUCA baseline design, measured in two laboratories with independent methods and setups. Preliminary results were reported in Palomares (JINST 18(02):C02064,
https://doi.org/10.1088/1748-0221/18/02/C02064
, 2023). One hundred sixty units of these X-ARAPUCA devices have been deployed in the NP04 facility at the CERN Neutrino Platform, the 1:20 scale FD1 prototype, and will be operated during the year 2024. The assessed value of the PDE is a key parameter both in the NP04 and in the DUNE analysis and reconstruction studies.
Journal Article
Seasonal changes in the structure of bird assemblages in tide-dominated marine coastal wetlands of Chiloe Archipelago (Chilean Northern Patagonia, South America)
The coastal wetlands of northern Chilean Patagonia are relevant sites for the conservation of migratory waterbirds. The aim of this paper is to compare different marine coastal wetlands to identify which factors influence the structure of bird assemblages. Sediment samples were collected, and the birds were surveyed in four wetlands: Chullec, Curaco de Vélez and Quinchao on Quinchao Island, and Putemún on Chiloé Island in 4 seasonal sampling campaigns. The composition of the sediment did not change during the year, with a predominance of sandy sediments except in Putemún where gravel dominates. The size of the sediment particle decreased from the upper (0 to 30 m) to the lower (100 m) intertidal. The abundances of benthic organisms varied between intertidal levels in all wetlands and seasonally in Chullec and Curaco de Vélez, being lower during warm seasons. Thirty-four species of birds were recorded with Anatidae, Laridae and Scolopacidae showing the highest species richness. A principal component analysis clustered the wetlands of Quinchao Island and the variables that account for 35.8% of the variance are sandy sediments, the presence of Scolopacidae, Laridae, Furnariidae and Haematopodidae among birds and Polychaeta, Malacostraca and Enopla in the benthos. In the wetlands of Quinchao Island there was a relationship between the composition of the sediment, distribution, and type of benthic communities with the presence of some bird taxa. The bird assemblages change seasonally and were similar to each other during warm seasons, probably due to the availability of food for migratory birds and sediment characteristics.
Journal Article
Relationship between the weights of seed beetles of the genus Megacerus Fåhraeus, 1839 (Coleoptera: Chrysomelidae: Bruchinae) and their host seeds of the family Convolvulaceae
We studied seeds from a set of plant species from the Convolvulaceae family. Seeds collected from natural populations and infested with beetles of genus
Megacerus
were monitored until the beetle emergence. We analyze the relationship between body weight of beetles and seed weight of host plants, and its connection with between-species differences and sexual dimorphism. The results show that differences in the scaling of body weight of beetles are associated with sexual dimorphism. For the same species of beetle, the females tend to have heavier bodies than the males. Differences between host plants species in the weight of seeds are related to differences in the body weight
Megacerus
species, resulting in a distinctive pattern of seed infestation across hosts. Small-sized (lighter) species of beetles tended to infest small-sized (lighter) seed species and, correspondingly, heavier beetles species tended to do it in heavier seed species. Mechanisms of female oviposition preferences may be involved to generate that pattern. In general, the beetle weight showed an asymptotic relation with the host seed weight. The greater the weight of the seed, the greater the weight of adult beetle was. However, the proportion in weights reaches an asymptotic value probably because beetles reached the maximum possible weight for their species. We conclude that the process of specialization in the seed-beetle assemblage studied is influenced by intrinsic traits of the species involved in the interaction (beetles and seeds) and by differences between sexes in their sexual-allocation paths.
Journal Article
Search for lepton flavor-violating decay modes B0→ K0τ±ℓ∓ (ℓ = e, μ) with hadronic B-tagging at Belle and Belle II
A
bstract
We present the results of a search for the charged-lepton-flavor violating decays
B
0
→
K
*0
τ
±
ℓ
∓
, where
ℓ
∓
is either an electron or a muon. The results are based on 365 fb
−
1
and 711 fb
−
1
datasets collected with the Belle II and Belle detectors, respectively. We use an exclusive hadronic
B
-tagging technique, and search for a signal decay in the system recoiling against a fully reconstructed
B
meson. We find no evidence for
B
0
→
K
*0
τ
±
ℓ
∓
decays and set upper limits on the branching fractions in the range of (2.9–6.4)×10
−
5
at 90% confidence level.
Journal Article
Search for lepton-flavor-violating decays at Belle and Belle II
A
bstract
We present the results of a search for charged-lepton-flavor violating decays
, where
ℓ
−
is either an electron or a muon. We combine
e
+
e
−
data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb
−
1
) with samples recorded by the Belle experiment at the KEKB collider (980 fb
−
1
) to obtain a sample of 1.3 billion
e
+
e
−
→ τ
+
τ
−
events. We observe 0 and 1 events and set 90% confidence level upper limits of 0
.
8
×
10
−
8
and 1
.
2
×
10
−
8
on the branching fractions of the decay modes
and
, respectively. These are the most stringent upper limits to date.
Journal Article
Early comprehension of the Spanish plural
Understanding how linguistic cues map to the environment is crucial for early language comprehension and may provide a way for bootstrapping and learning words. Research has suggested that learning how plural syntax maps to the perceptual environment may show a trajectory in which children first learn surrounding cues (verbs, modifiers) before a full mastery of the noun morpheme alone. The Spanish plural system of simple codas, dominated by one allomorph -s, and with redundant agreement markers, may facilitate early understanding of how plural linguistic cues map to novel referents. Two-year-old Mexican children correctly identified multiple novel object referents when multiple verbal cues in a phrase indicated plurality as well as in instances when the noun morphology in novel nouns was the only indicator of plurality. These results demonstrate Spanish-speaking children's ability to use plural noun inflectional morphology to infer novel word referents which may have implications for their word learning.
Journal Article