scholarly journals The Role of Periodic Structures in Light Harvesting

Plants ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1967
Author(s):  
Eugene Bukhanov ◽  
Alexandr V. Shabanov ◽  
Mikhail N. Volochaev ◽  
Svetlana A. Pyatina
Keyword(s):  
Light Propagation ◽  
Periodic Structures ◽  
Spectral Characteristics ◽  
Visible Spectral Range ◽  
Ordered Structure ◽  
Plant Leaves ◽  
Long Period ◽  
Spectrum Area ◽  
Photon States

The features of light propagation in plant leaves depend on the long-period ordering in chloroplasts and the spectral characteristics of pigments. This work demonstrates a method of determining the hidden ordered structure. Transmission spectra have been determined using transfer matrix method. A band gap was found in the visible spectral range. The effective refractive index and dispersion in the absorption spectrum area of chlorophyll were taken into account to show that the density of photon states increases, while the spectrum shifts towards the wavelength range of effective photosynthesis.

Facilitators, challenges and usefulness of an asthma educational programme

2020 ◽  
pp. 001789692098162
Author(s):  
Muhammad Naeem ◽  
Hamad Ghalib Dailah
Keyword(s):  
Cultural Context ◽  
Educational Programme ◽  
Structured Interviews ◽  
Policy Makers ◽  
Long Period ◽  
Breathing Techniques ◽  
Educational Programmes ◽  
Asthma Patients ◽  
Programme Content

Background: This study explored the role of hospitals, specialised doctors and staff in developing patient awareness, participation and motivation concerning asthma control. It also looked at the challenges that undermine the value of asthma educational programmes, especially in an Arab cultural context. Methods: Semi-structured interviews were used to collect data from 30 asthma patients who had been living with asthma for a long period of time. Results: Findings highlight how an asthma educational programme can increase patient knowledge about the causes of asthma. Following the programme, patients had a better understanding of levels of medication, breathing techniques and rest and relaxation. Awareness of support from health professionals for managing depression and frustration also increased. However, some patients felt that the asthma educational programme content and delivery was not very interactive and was too lengthy. Conclusion: Findings can help policy makers, researchers, hospitals, doctors and the national Ministry of Health improve the content of future asthma educational programmes. They can also inform the development of a research framework to extend understanding of relevant issues in an Arabian context.

Document supply and resource sharing in Portuguese libraries: the role of the National Library

2010 ◽  
Vol 38 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Elisa Maria Gaudêncio Soares
Keyword(s):  
Information Technology ◽  
Resource Sharing ◽  
Design Methodology ◽  
Public Library ◽  
Supply System ◽  
National Library ◽  
Content Type ◽  
Long Period ◽  
Recent Developments

PurposeThe purpose of the paper is to describe the development of the Portuguese document supply system with particular emphasis on the role of the National Library but also in its academic and public library sectors.Design/methodology/approachThe paper is descriptive in nature.FindingsPortugal emerged from a long period of monarchy and dictatorship, profited from being a EU member, and libraries are now exploiting the advantages of information technology particularly for the benefit of remote users.Originality/valueThis is probably the first overview of historical and recent developments in document supply in Portugal.

Light propagation in cholesteric liquid crystals: the role of chirality

2020 ◽  
Vol 713 (1) ◽  
pp. 65-77
Author(s):  
Tianyi Guo ◽  
Xiaoyu Zheng ◽  
Peter Palffy-Muhoray
Keyword(s):  
Liquid Crystals ◽  
Light Propagation ◽  
Cholesteric Liquid Crystals

Observation of gliding tremors from the Gulf of Guinea might help solve over 50 year old mystery

2021 ◽  
Author(s):  
Charlotte Bruland ◽  
Sarah Mader ◽  
Céline Hadziioannou
Keyword(s):  
Spectral Analysis ◽  
Volcanic Activity ◽  
Rayleigh Waves ◽  
Spectral Characteristics ◽  
Gulf Of Guinea ◽  
Seismic Amplitude ◽  
Long Period ◽  
Amplitude Spectra ◽  
Using Data ◽  
Over Time

<p>In the 1960's a peak in the seismic amplitude spectra around 26 s was discovered and detected on stations worldwide. The source was located in the Gulf of Guinea, with approximate coordinates (0,0), and was believed to be generated continuously. A source with similar spectral characteristics was discovered near the Vanuatu Islands, at nearly the antipodal location of the Gulf of Guinea source. Since it was located close to the volcanoes in Vanuatu, this source is commonly attributed to magmatic processes. The physical cause of the 26 s microseism, however, remains unclear.</p><p>We investigate the source location and evolution of the 26 s microseim using data from permanent broadband stations in Germany, France and Algeria and temporary arrays in Morocco, Cameroon and Botswana for spectral analysis and 3-C beamforming to get closer to resolving the source mechanism responsible for this enigmatic signal. We find that the signal modulates over time and is not always detectable, but occasionally it becomes so energetic it can be observed on stations worldwide. Such a burst can last for hours or days. The signal is visible on stations globally approximately 30 percent of the time. Our beamforming analysis confirms that the source is located in the Gulf of Guinea, as shown in previous studies, and that the location is temporally stable. Whenever the signal is detectable, both Love and Rayleigh waves are generated. We discover a spectral glide effect associated with the bursts, that so far has not been reported in the literature. </p><p>The spectral glides last for about two days and are observed on stations globally. Although at higher frequencies, very long period tremors and gliding tremors are also observed on volcanoes as Redoubt in Alaska and Arenal in Costa Rica, suggesting that the origin of the 26 s tremor is also volcanic. However, there is no reported volcanic activity in the area where the source appears to be located.</p><p> </p>

scholarly journals An Abbey as a Stronghold

2021 ◽  
Vol 17 (1) ◽  
pp. 229-271
Author(s):  
Hrvoje Kekez
Keyword(s):  
Virgin Mary ◽  
16Th Century ◽  
Defense System ◽  
Long Period ◽  
Blessed Virgin Mary ◽  
Strategic Role ◽  
Large Estate ◽  
Do So

The main goal of this paper is to analyze the strategic role of Cistercian abbey of Blessed Virgin Mary in Topusko (medieval Toplica) in anti-Ottoman defense during 16th century, especially because it is rather exceptional of usage sacral complex in anti-Ottoman defense system in rather long period. In order to do so it is determined and analyzed strategic importance of the monastic complex in anti-Ottoman defense line and the change of it according to ever going Ottoman conquest of new territories, i.e. approaching of the bordering line. Furthermore, the organization of defense of the rather large estate of Topusko abbey as well as the changes of the monastic fortifications are addressed. Even more, the role of the commendatory abbots of the abbey, as well the serves of the abbey, in the larger efforts in composing and functioning of the anti-Ottoman defense line are analyzed. Finally, the proximate time and context of the final abandoning of the former Cistercian abbey is determined.

scholarly journals Armenian Women In Jordan

1970 ◽  
pp. 24-26
Author(s):  
Arda Dargarabedian
Keyword(s):  
Ethnic Minorities ◽  
Economic Status ◽  
Long Period ◽  
Armenian Women

Armenians are among the smallest ethnic minorities in Jordan and have been in the country for a fairly long period of time. This paper will deal mainly with the position and role of Armenian women in Jordanian society by reviewing their general characteristics, social and economic status (based on data from a recent study about Armenians in Jordan), using indicators that reflect their position and role in the concerned areas from a gendered perspective.

scholarly journals Hydrogen generation by hydrolysis reaction using magnesium alloys with long period stacking ordered structure

2021 ◽  
Author(s):  
M. Legrée ◽  
V. Charbonnier ◽  
S. Al Bacha ◽  
K. Asano ◽  
K. Sakaki ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Hydrogen Generation ◽  
Hydrolysis Reaction ◽  
Ordered Structure ◽  
Long Period

Slip, twinning, and fracture at a grain boundary in the L12 ordered structure—AΣ = 9 tilt boundary

1988 ◽  
Vol 3 (5) ◽  
pp. 848-855 ◽  
Author(s):  
M. H. Yoo ◽  
A. H. King
Keyword(s):  
Intergranular Fracture ◽  
Local Stress ◽  
Boundary Region ◽  
Anisotropic Elasticity ◽  
Tilt Boundary ◽  
Microplastic Deformation ◽  
Ordered Structure ◽  
Local Stress Concentration ◽  
Boron Segregation

The role of interaction between slip dislocations and a Σ = 9 tilt boundary in localized microplastic deformation, cleavage, or intergranular fracture in the Li2 ordered structure has been analyzed by using the anisotropic elasticity theory of dislocations and fracture. Screw superpartials cross slip easily at the boundary onto the (1$\overline 1$1) and the (001) planes at low and high temperatures, respectively. Transmission of primary slip dislocations onto the conjugate slip system occurs with a certain degree of difficulty, which is eased by localized disordering. When the transmission is impeded, cleavage fracture on the ($\overline 1$11) plane is predicted to occur, not intergranular fracture, unless a symmetric double pileup occurs simultaneously. Absorption (or emission) of superpartials occurs only when the boundary region is disordered. Slip initiation from pre-existing sources near the boundary can occur under the local stress concentration. Implications of the present result on the inherent brittleness of grain boundaries in Ni3 Al and its improvement by boron segregation are discussed.

Southeast Europe

2021 ◽  
pp. 712-729
Author(s):  
Vasilios N. Makrides
Keyword(s):  
Roman Catholicism ◽  
Southeast Europe ◽  
Religious Identities ◽  
Orthodox Christian ◽  
The Balkans ◽  
Long Period ◽  
Modernization Process ◽  
Religious Landscape ◽  
Geographical Context

This chapter charts the religious landscape of Southeast Europe and considers its religious specificities in their historical and geographical context. To this purpose, it discusses the significance of the Orthodox Christian heritage of Byzantium; the cleavage between Eastern and Western Christianity (both Roman Catholicism and Protestantism) and inter-confessional dynamics; the presence of Islam and the long period of Ottoman rule; the existence of other religions in the region; the role of Russia in Southeast European affairs; ethno-religious identities and the rise of nationalism; the communist and the post-communist periods; and finally, the negative discourse about the Balkans in the context of Southeast European distinctiveness, the modernization process, and the potential for religion in this.

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