Proposed Earth-Mars Trade Routes for 21st Century Tourism: A Survey of High Energy Interplanetary Transfer Orbits

Research and development in textiles have gone beyond the conventional applications as clothing and furnishing materials; for example, the convergence of textiles, nanotechnologies, and energy science opens up the opportunity to take on one of the major challenges in the 21st century energy. This presentation addresses the development of high-energy lithium-ion batteries using electrospun nanofibers.

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Growth and Maturation: The Connection with Physical Activity to Obese Children

Asian Journal of Physical Education & Recreation ◽

10.24112/ajper.71252 ◽

2001 ◽

Vol 7 (1) ◽

pp. 42-48

Author(s):

Patrick LAU

Keyword(s):

Physical Activity ◽

21St Century ◽

Physical Inactivity ◽

High Energy ◽

Obesity Management ◽

Obese Children ◽

High Energy Intake ◽

Prevention And Treatment ◽

Health Related ◽

Unrealistic Expectations

LANGUAGE NOTE | Document text in English; abstract also in Chinese.Childhood obesity is expected more serious in the 21st century. The etiology of obesity has been investigated for more than decades and nobody will argue that physical inactivity and high-energy intake are the two core factors. For the sake of prevention and treatment, it is imperative to look into the nature and health-related effects of physical activity towards obesity management. The objective of this chapter is to clarify the effects of physical activity participation on adolescents' body changes and avoid unrealistic expectations from it. The content is mainly focus upon the growth and maturation characteristics of adolescents who are regularly active in physical activity and the cardiovascular changes through physical activity.兒童肥胖問題在廿一世紀將會愈趨嚴重，在過去十多年來研究一直探討其成因，基本上運動與營養控制兩者一致被確認為決定性的因素。因此在預防與治療而言，運動對肥胖處理及治療的效果及性質上，深入的研究探討是必要的，本文旨在釐清兒童在成長過程中參與運動對身體變化的影響，以防止肥胖兒童對身體產生不切實際的期望。

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China’s Geostrategic Interests in the Indian Ocean Region: Implications for Kenya

The African Review ◽

10.1163/1821889x-12340024 ◽

2020 ◽

pp. 1-15

Author(s):

Paul Odhiambo

Keyword(s):

Indian Ocean ◽

21St Century ◽

Indian Ocean Region ◽

East African ◽

National Interests ◽

Trade Routes ◽

Effective Strategies ◽

Ocean Region ◽

The Indian Ocean ◽

Peaceful Development

Abstract China’s growing influence in the Indian Ocean cannot be gainsaid as the East Asian economic powerhouse engages in a series of activities to secure maritime routes for energy supplies; to guarantee its trade routes; and to exercise increased maritime influence on the sea lines of communication (SLOCs). Since the beginning of the 21st century, Beijing has enhanced its presence in the Indian Ocean Region (IOR) through construction of ports, increased Chinese naval presence, participation in anti-piracy operations in the Gulf of Aden, construction of a military base in Djibouti, One belt One road initiative and 21st century Maritime Silk Road. While China reassures of its peaceful development, critics contend that Beijing’s military-strategic intentions are aimed at dominance in the Indian Ocean. Countries of the IOR are a home to 2.5 billion people. About 80 percent of the world’s maritime oil trade flows through three chokepoints in the Indian Ocean. Moreover, Indian Ocean is emerging as a pivotal zone due to fast growing economies in the region. Due to its geostrategic significance, the Indian Ocean is expected to play a considerable role in the development of East African littoral states including Kenya. This paper analyzes the growing presence of China in IOR and how Nairobi’s engagement with Beijing could enable Kenya to realize its geostrategic interests in the Indian Ocean. The paper recommends that Kenya needs to have effective strategies to maximize the potential from its exclusive economic zone and secure its national interests as a littoral state.

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Production and assortment of dry beans in Serbia

Biljni lekar ◽

10.5937/biljlek2106729v ◽

2021 ◽

Vol 49 (6) ◽

pp. 729-744

Author(s):

Mirjana Vasić ◽

Srđan Šeremešić ◽

Jelena Marinković ◽

Aleksandra Tepić-Horecki ◽

Milan Zdravković ◽

...

Keyword(s):

High Energy ◽

Biological Traits ◽

Dry Beans ◽

Trade Routes ◽

Genetic Potential ◽

Population Migrations ◽

Cultivation Technology ◽

New Varieties ◽

Great Divergence ◽

Polyphagous Insects

Dry beans belong to pulses, species from Fabaceae family. Its dry grain is used in human nutrition. It is valued as traditional and modern food and medicine, protein source, and high-energy concentrated food. It is an important crop in agricultural production and international trade of many countries, economically viable and good preceding crop. Dry beans are considered the national dish of all people from Balkans, and it is inviolable in Serbia. Crossing of important trade routes, land and climate, turbulent history, which caused frequent population migrations, led to a great divergence of bean germplasm in our area. Domestic bean populations are exceptional genetic potential for breeding of new varieties that could give satisfactory results in these environmental conditions, with the application of appropriate cultivation technology. Areas under beans in Serbia are declining. Due to short vegetation and other biological traits, bean is very intensive and sensitive crop. This is emphasized by exceptional sensitivity to polyphagous insects, as well as the presence numerous pathogens. Low average yield is affected by weather, primarily high temperatures and drought. Yields could be increased by correct and timely application of modern agronomic knowledge, irrigated cultivation, in a joint crop or by sowing as second crop.

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A Chance for the Climate. Fuel of the 21st Century – Analysis of the Perspective of Climate Neutrality on the Example of the Polish Hydrogen Strategy

Safety & Fire Technology ◽

10.12845/sft.58.2.2021.7 ◽

2021 ◽

Vol 58 (2) ◽

pp. 120-138

Author(s):

Krzysztof Cygańczuk ◽

Paweł Wolny

Keyword(s):

Renewable Energy ◽

Natural Gas ◽

21St Century ◽

Alternative Fuels ◽

High Energy ◽

Green Energy ◽

Sustainable Growth ◽

High Energy Density ◽

Oil Refining ◽

Gas Emissions

Aim: This article attempts to present the issues related to the search for alternatives to energy resources in all sectors of the economy. The direction of the search is to choose “green energy” (in this case hydrogen), which, due to its potential wide application, is already beginning to be treated as an instrument of carbon neutrality. Most EU countries have agreed that they will be carbon-neutral by 2050, which should result in the reduction of greenhouse gas emissions to the atmosphere by around 95% compared to the beginning of the gas emissions calculation in 1990. However, achieving emission neutrality will require a far-reaching elimination of emissions not only in the power sector, but also in other sectors (including industry, transport and heating). These areas still rely on emission fossil fuels (coal, crude oil and natural gas), which cannot be directly replaced with electricity from RES. Introduction: Hydrogen is not a source of energy, but it is a very effective carrier. Although it is practically not in the free state, it is very often found in the form of chemical compounds such as CH4 (methane) or H2O (water). In order to extract the energy it contains, it must be isolated from the molecules it is composed of. Hydrogen can be transported via gas pipelines (gaseous) or tankers (liquefied). It is currently used in the petrochemical industry, in - cluding for oil refining and chemical industry for the production of fertilizers, ammonia or methanol. Recently, hydrogen has become a topic that is often discussed in the public space in the context of climate protection (and thus decarbonisation of the economy). This fuel is credited with extraordinary potential and applicability in so many areas that it should be widely regarded as oil of the 21st century and a key element of the new energy policy. Moreover, the investment in hydrogen should support sustainable growth and job creation, which will be critical when recovering from the COVID-19 pandemic. Methodology: The article provides an overview of research questions and the most recent results of considerations. It presents a multidimensional and interdisciplinary analysis of the suitability of alternative fuels and the implementation of the related projects. The analysis of the topic was based on, among others, on the project of the Polish Hydrogen Strategy, which is important for the further development of research topics and cooperation in this field. Conclusions: For the energy sector that processes available forms of energy, hydrogen is probably a good choice for the future. It can be an alternative to natural gas in providing backup capacity for renewable energy sources that produce energy dependent on weather conditions (i.e. sun and wind). Hy- drogen, which has the advantage of high energy density, is also a good tool for storing renewable energy and for transmitting and distributing renewable energy over long distances. Due to this, green energy from regions of the world with high insolation and wind energy, such as Australia, Latin America or North Africa, could be transferred over long distances (taking into account losses in energy networks it would be a much more economical solution). It would not require high-cost investments in new infrastructure. The article deals with the aspects relating to all parts of the value chain – production, transmission, storage and use of hydrogen, taking into account the legal conditions at the national (Polish Hydrogen Strategy) and the EU level, and proposing sustainable support systems and measurable goals. Keywords: green hydrogen, synthetic fuel, renewable energy, solar fuel, hydrogen Article type: review article

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