scholarly journals Morinda citrifolia (Indian mulberry).

2020 ◽  
Author(s):  
Julissa Rojas-Sandoval
Keyword(s):  
Salt Spray ◽  
Wide Distribution ◽  
Morinda Citrifolia ◽  
Alkaline Soils ◽  
Small Tree ◽  
Air Chamber ◽  
The Pacific ◽  
Wide Range ◽  
Indian Mulberry ◽  
Harsh Conditions

Abstract M. citrifolia is a shrub or small tree that in recent years has attained significant economic importance worldwide due to the great variety of health and cosmetic products made from its leaves and fruits. Consequently, it has been extensively introduced in cultivation and can be found cultivated and naturalized across tropical and subtropical regions of the world (Groenendijk, 1991; Nelson, 2006; Orwa et al., 2009; USDA-ARS, 2017). Currently, M. citrifolia is listed as invasive in Cuba, Costa Rica, the Dominican Republic and Haiti (Kairo et al., 2003; Chacon and Saborio, 2012, Oviedo Prieto et al., 2012). M. citrifolia is a species that can tolerate and thrive in very harsh conditions. It is well adapted to a wide range of environmental conditions and soil types. It can grow in infertile, acidic, and alkaline soils, and in areas with climates ranging from very dry to very wet. It is also tolerant to fire, waterlogging, wind, shaded conditions (>80% shade) and salt spray (Francis, 2004; Nelson, 2006; PROTA, 2017). For instance, M. citrifolia is one of the first plants to colonize harsh waste areas or lava flows on islands across the Pacific region and is also one of the few species that can thrive beneath the canopy of the allelopathic tree Casuarina equisetifolia (Nelson, 2006). Additionally, M. citrifolia has a deep taproot and an extensive and aggressive root system and once established it is very persistent and difficult to eradicate. Seeds have a distinct air chamber and can retain viability even after floating in water for months, facilitating the wide distribution and occurrence of this species on many seashores worldwide (Nelson, 2006).

Energy Harvesting Under Harsh Conditions for the Oil & Gas Upstream Industry

2021 ◽  
Author(s):  
José Correia ◽  
Cátia Rodrigues ◽  
Ricardo Esteves ◽  
Ricardo Cesar Bezerra de Melo ◽  
José Gutiérrez ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Oil And Gas ◽  
Electrical Energy ◽  
Development Stage ◽  
Gas Extraction ◽  
Power Monitoring ◽  
Operational Conditions ◽  
Wide Range ◽  
First Time ◽  
Harsh Conditions

Abstract Environmental and safety sensing is becoming of high importance in the oil and gas upstream industry. However, present solutions to feed theses sensors are expensive and dangerous and there is so far no technology able to generate electrical energy in the operational conditions of oil and gas extraction wells. In this paper it is presented, for the first time in a relevant environment, a pioneering energy harvesting technology based on nanomaterials that takes advantage of fluid movement in oil extraction wells. A device was tested to power monitoring systems with locally harvested energy in harsh conditions environment (pressures up to 50 bar and temperatures of 50ºC). Even though this technology is in an early development stage this work opens a wide range of possible applications in deep underwater environments and in Oil and Gas extraction wells where continuous flow conditions are present.

Corrosion resistant metal-ceramic composite coatings for tribological applications

2021 ◽  
pp. 1-34
Author(s):  
Peter Renner ◽  
Swarn Jha ◽  
Yan Chen ◽  
Tariq Chagouri ◽  
Serge Kazadi ◽  
...  
Keyword(s):  
Ceramic Composite ◽  
Low Cost ◽  
Composite Coatings ◽  
Salt Spray ◽  
Extreme Environments ◽  
Safe Procedure ◽  
Corrosion Resistant ◽  
Wide Range ◽  
Metal Ceramic ◽  
Corrosion Resistant Coatings

Abstract Effective design of corrosion-resistant coatings is critical for the protection of metals and alloys. Many state-of-the-art corrosion-resistant coatings are unable to satisfy the challenges in extreme environments for tribological applications, such as elevated or cryogenic temperatures, high mechanical loads and impacts, severe wear, chemical attack, or a combination of these. The nature of challenging conditions demands that coatings have high corrosion and wear resistance, sustained friction control, and maintain surface integrity. In this research, multi-performance metal-ceramic composite coatings were developed for applications in harsh environments. These coatings were developed with an easy to fabricate, low-cost, and safe procedure. The coating consisted of boron nitride, graphite, silicon carbide, and transition metals such as chromium or nickel using epoxy as vehicle and bonding agent. Salt spray corrosion tests showed that 1010 carbon steel (1/4 hard temper) substrates lost 20-100× more mass than the coatings. The potentiodynamic polarization study showed better performance of the coatings by seven orders of magnitude in terms of corrosion relative to the substrate. Additionally, the corrosion rates of the coatings with Ni as an additive were five orders of magnitude lower than reported. The coefficient of friction of coatings was as low as 0.1, five to six times lower than that of epoxy and lower than a wide range of epoxy resin-based coatings found in literature. Coatings developed here exhibited potential in applications in challenging environments for tribological applications.

scholarly journals Senna alata (candle bush).

2020 ◽  
Author(s):  
Jeanine Vélez-Gavilán
Keyword(s):  
French Polynesia ◽  
Northern Territory ◽  
Risk Assessments ◽  
Small Tree ◽  
Federated States Of Micronesia ◽  
Disturbed Areas ◽  
The Pacific ◽  
Cultivated Plant ◽  
Environmental Weed ◽  
Senna Alata

Abstract S. alata is a shrub or small tree that is used as an ornamental and a cultivated plant throughout its range (Irwin and Barneby, 1982; PROTA, 2016). The species is reported as escaping from cultivation and becoming a weed in pastures, disturbed areas, orchards, plantations and shrublands (Irwin and Barneby, 1982; ILDIS, 2016). Livestock do not eat it, so the species has the potential to spread rapidly without control (ILDIS, 2016). It is reported as invasive in Asia (Hong Kong, Philippines, Singapore), East Africa and Oceania (Australia, Cook Islands, Federated States of Micronesia, Fiji, French Polynesia, Galapagos Islands, Guam, Hawaii, Palau, Papua New Guinea, Samoa and Tonga) (PIER, 2016). It is regarded as a significant environmental weed in the Northern Territory of Australia (Weeds of Australia, 2016). Risk assessments prepared for both Australia and the Pacific classed it as high risk (PIER, 2016).

scholarly journals ANALISIS BIAYA OPERASIONAL KENDARAAN (BOK) DAN WTP (WILLINGNESS TO PAY) PADA BUS AKAP JURUSAN BANJARMASIN - SAMARINDA

2018 ◽  
Vol 1 (2) ◽  
pp. 115
Author(s):  
Bagus Nugroho Putra ◽  
Utami Sylvia Lestari
Keyword(s):  
Willingness To Pay ◽  
Public Transportation ◽  
Operating Costs ◽  
Bus Drivers ◽  
The Public ◽  
Passenger Transportation ◽  
The Pacific ◽  
Wide Range ◽  
Transportation Facilities

Kota Banjarmasin adalah ibu kota provinsi dari Kalimantan Selatan dengan berbagai macam aktivitas. Salah satu angkutan umum Kota Banjarmasin adalah bus AKAP (Antar Kota Antar Provinsi) PO. Pulau Indah Jaya yang melayani transportasi penumpang dengan tujuan kota dan provinsi. Sarana transportasi memiliki tarif biaya yang ditentukan berdasarkan Biaya Operasional Kendaraan (BOK). Tujuan penelitian ini untuk mengetahui besar BOK bus AKAP dengan metode Pacific Consultant International (PCI) dan untuk mengetahui besar tarif yang diinginkan penumpang beserta tanggapan terhadap tarif yang berlaku saat ini Willingness To Pay (WTP).Penelitian ini dilakukan melalui survei wawancara untuk BOK kepada pihak PO. dan sopir bus dengan jumlah data 25 unit bus dan untuk WTP survei wawancara dengan sampel 200 penumpang bus di terminal KM 6 tempat pembelian tiket bus.Besar BOK yang dikeluarkan oleh PO. Pulau Indah Jaya Rp Rp 8.137.912.279 /tahun (bus Non AC) dengan tarif Rp 168.194 /penumpang dan Rp 8.712.239.580 /tahun (bus AC+Toilet) dengan tarif Rp 229.173 /penumpang. Besar nilai WTP bus Non AC Rp 185.000 /penumpang dan AC+Toilet Rp 245.000 /penumpang. Tanggapan terhadap tarif bus AKAP Non AC Rp 175.000 /penumpang dan AC+Toilet Rp 235.000 /penumpang adalah harga tarif bus  sesuai dengan kemampuan penumpang membayar dan mau membayar lebih dengan syarat adanya penambahan pelayanan dan fasilitas.Kata Kunci: Bus AKAP, Biaya Operasional Kendaraan (BOK), Willingness To Pay (WTP)banjarmasin city is the capital of the province of South Borneo with a wide range of activities. One of the public transportation of Banjarmasin city is the bus AKAP (Inter-City Inter Province) PO. Pulau Indah Jaya which serves passenger transportation with a city and provincial destinations. Transportation facilities have a fee that is determined based on Vehicle Operating Costs (VOC). The purpose of this study is to find out the size of the bus AKAP VOC with the Pacific Consultant International (PCI) method and to find out the number of tariffs desired by passengers along with responses to the current rates of Willingness To Pay (WTP).This research was conducted through interview surveys for VOC to PO. parties and bus drivers with data on 25 bus units and for WTP interview surveys with a sample of 200 bus passengers at the terminal KM 6 places to buy bus tickets.VOC amount issued by PO. Pulau Indah Jaya Rp. 8.137.912.279 /year (Non AC buses) with a tariff of Rp 168.194 /passenger and Rp. 8.712.239.580 /year (AC + Toilet bus) at a rate of Rp. 229.173 /passenger. The value of the Non AC WTP bus is Rp. 185.000 /passenger and the AC + Toilet Rp. 245.000 /passenger. The response to the AKAP Non AC bus fare of Rp. 175.000 /passenger and AC + Toilet Rp. 235.000 /passenger is the price of the bus fare according to the ability of the passengers to pay and pay more on the condition of additional services and facilities.Keywords: Bus AKAP, Vehicle Operating Costs (VOC), willingness to pay (WTP) 

scholarly journals The role of environment, local adaptation and past climate fluctuation on the amount and distribution of genetic diversity in the teosinte in Mexico

2019 ◽  
Author(s):  
Jaime Gasca-Pineda ◽  
Yocelyn T. Gutiérrez-Guerrero ◽  
Erika Aguirre-Planter ◽  
Luis E. Eguiarte
Keyword(s):  
Genetic Diversity ◽  
Local Adaptation ◽  
Environmental Conditions ◽  
Wide Distribution ◽  
Wide Range ◽  
Significant Genetic Structure ◽  
Nuclear Microsatellite ◽  
Genetic Clusters ◽  
Assignment Analysis ◽  
Climate Fluctuation

AbstractWild maize, commonly known as teosinte, has a wide distribution in central Mexico and inhabits a wide range of environmental conditions. According to previous studies, the environment is a determinant factor for the amount and distribution of genetic diversity. In this study, we used a set of neutral markers to explore the influence of contemporary factors and historical environmental shifts on genetic diversity, including present and three historical periods. Using a set of 22 nuclear microsatellite loci, we genotyped 527 individuals from 29 localities. We found highly variable levels of genetic diversity (Z. m. parviglumis HE= 0.3646–0.7699; Z. m. mexicana HE= 0.5885–0.7671) and significant genetic structure among localities (average DEST= 0.4332). Also, we recovered significant values of heterozygote deficiency (average FIS= 0.1796) and variable levels of selfing (sg2=0.0–0.3090). The Bayesian assignment analysis yielded four genetic clusters dividing the sample into subspecies, that in turn, were separated into two clusters. Environmental conditions played a strong influence in the distribution of genetic diversity, as demographic analysis and changes in species range revealed by modeling analyses were consistent. We conclude that current genetic diversity in teosinte is the result of a mixture of local adaptation and genetic isolation along with historical environmental fluctuations.

scholarly journals Evaluation of Seven Complex Pennisetum Hybrids for Container and Landscape Performance in the Pacific Northwestern United States

2013 ◽  
Vol 23 (4) ◽  
pp. 525-528 ◽  
Author(s):  
Ryan N. Contreras ◽  
Jim Owen ◽  
Wayne Hanna ◽  
Brian Schwartz
Keyword(s):  
United States ◽  
Growth Form ◽  
Field Performance ◽  
Eastern United States ◽  
Randomized Experiments ◽  
Climatic Regions ◽  
The Pacific ◽  
Wide Range ◽  
Complex Hybrid ◽  
Market Preference

Ornamental grasses such as fountaingrass or napiergrass, collectively called pennisetums, belong to the genus Pennisetum, which is a diverse genus with over 80 species adapted to a wide range of climatic regions and known for its drought tolerance. Breeding efforts have led to improvements such as more intense purple foliage color, disease resistance, and apparent sterility. These improved forms have been developed and tested in the eastern United States. The objective of this research was to evaluate container and field performance of seven new complex hybrid pennisetums in the Pacific northwestern United States. Two completely randomized experiments with three replications were conducted over 2 years (2010 and 2011) at two locations. We selected seven trispecific hybrid pennisetums resulting from interploid and interspecific crossing that were given accessions Tift 5, Tift 6, Tift 10, Tift 11, Tift, 13, Tift 15, and Tift 26. Experiment 1 evaluated container performance in Corvallis, OR, while Expt. 2 evaluated field performance in Aurora, OR. Size index (SI), growth form rating, and color rating were collected and analyzed separately by location. In the container study, significant differences were observed among selections for growth form in 2010 and color ratings in both 2010 and 2011. In 2010, Tift 6, Tift 11, Tift 13, and Tift 15 had the highest growth form rating. For color rating, Tift 5, Tift 10, and Tift 26 were among the four highest rated selections in both years. In the field study, Tift 5, Tift 10, Tift 11, and Tift 26 had the highest SI when data were pooled over the 2 years, but all selections reached acceptable size for landscape use during both years of the study. Similarly, there were color differences among selections with Tift 5, Tift 10, Tift 15, and Tift 26 being highest rated. None of the selections survived below winter temperatures of −5 °C at either location during either year of the study. Our evaluations indicate that these selections have potential in the Pacific northwestern United States as annuals. Differences in complex hybrid pennisetums were observed in SI, growth form rating, and color rating. These differences demonstrated the variation among selections and will allow producers to choose desired traits based on market preference.

scholarly journals Coastal Wave Extremes around the Pacific and Their Remote Seasonal Connection to Climate Modes

Climate ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 168
Author(s):  
Julien Boucharel ◽  
Loane Santiago ◽  
Rafael Almar ◽  
Elodie Kestenare
Keyword(s):  
Large Scale ◽  
Wind Wave ◽  
Boreal Summer ◽  
Opposite Hemisphere ◽  
Ocean Surface Waves ◽  
First Order ◽  
Coastal Waves ◽  
The Pacific ◽  
Wide Range ◽  
The Tropics

At first order, wind-generated ocean surface waves represent the dominant forcing of open-coast morpho-dynamics and associated vulnerability over a wide range of time scales. It is therefore paramount to improve our understanding of the regional coastal wave variability, particularly the occurrence of extremes, and to evaluate how they are connected to large-scale atmospheric regimes. Here, we propose a new “2-ways wave tracking algorithm” to evaluate and quantify the open-ocean origins and associated atmospheric forcing patterns of coastal wave extremes all around the Pacific basin for the 1979–2020 period. Interestingly, the results showed that while extreme coastal events tend to originate mostly from their closest wind-forcing regime, the combined influence from all other remote atmospheric drivers is similar (55% local vs. 45% remote) with, in particular, ~22% coming from waves generated remotely in the opposite hemisphere. We found a strong interconnection between the tropical and extratropical regions with around 30% of coastal extremes in the tropics originating at higher latitudes and vice-versa. This occurs mostly in the boreal summer through the increased seasonal activity of the southern jet-stream and the northern tropical cyclone basins. At interannual timescales, we evidenced alternatingly increased coastal wave extremes between the western and eastern Pacific that emerge from the distinct seasonal influence of ENSO in the Northern and SAM in the Southern Hemisphere on their respective paired wind-wave regimes. Together these results pave the way for a better understanding of the climate connection to wave extremes, which represents the preliminary step toward better regional projections and forecasts of coastal waves.

scholarly journals Cognitive & Pragmatic Approach to the Phraseological Intensifiers of Political Discourse

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Nadejda Zubareva ◽  
◽  
Iroda Siddikova
Keyword(s):  
Political Discourse ◽  
Wide Distribution ◽  
Linguistic Meaning ◽  
Linguistic Context ◽  
Pragmatic Approach ◽  
Cognitive Linguistic ◽  
Wide Range ◽  
Pragmatic Paradigm

The present paper reports on a study that aims to explore the cognitive and pragmatic potential of leveraging phraseological intensifiers in English political discourse. The authors argue that the phraseological intensifiers of political discourse could not be discussed without any contribution to the extra-linguistic context. Therefore, the present study works with a cognitive linguistic explanation of the phraseological intensifiers used by English politicians and journalists as well as performed pragmatic impact that aimed to foster the relevant conceptualization process. The suggestion of phraseological intensifiers depends on context linguistic meaning in the employed by the authors cognitive-pragmatic paradigm. This paper also denotes a wide range of relative to intensity categories, which should be distinguished from it. Such an analysis allows the authors to account for the wide distribution of intensifiers and their co-occurrence with categories that do not encode degree variables. The results of the study show that phraseological intensifiers significantly outperformed in the degree of pragmatic suggestion in political discourse and made use of them in a more appropriate way.

scholarly journals Geometry and the Mechanism of Landslide Occurrence in a Limestone Area – Case Examples of Landslides in Vietnam and from Europe, China, and Japan –

2021 ◽  
Vol 16 (4) ◽  
pp. 646-657
Author(s):  
Bui Duc Tung ◽  
Ngoc Ha Do ◽  
Nguyen Kim Thanh ◽  
Le Hong Luong ◽  
Osamu Watanabe ◽  
...  
Keyword(s):  
Southern China ◽  
Accretionary Prism ◽  
Wide Distribution ◽  
Case Examples ◽  
Landslide Occurrence ◽  
Sedimentary Characteristics ◽  
Tethys Sea ◽  
Wide Range ◽  
The Difference ◽  
Mechanism Of Landslide

Landslide damage has been reported in many limestone areas in Europe, where the population lives close to limestone areas, and in Guilin in southern China and Ha Long in Vietnam, which are known for their unique limestone landscapes. There are few studies on the mechanism and type of landslide motion in and around such limestone areas. The lack of basic data is a problem for risk assessment and countermeasures in limestone areas. In this study, we summarized the causes and mechanisms of landslide occurrence, including geology and groundwater, focusing on six landslides that occurred in limestone areas in northern Vietnam, and classified them into six types of landslide movement. In the case of Japan, the occurrence of landslides in limestone areas is rare despite the wide distribution of limestone, and it is difficult to classify the type of movement. Differences in the landslide mechanisms are caused by the difference between limestones generated in the pelagic environment of Japan and limestones developed along the Tethys Sea coast, which are mixed with pelitic rocks as shallow-water sediments in Europe, China, and Vietnam. It is necessary to elucidate the relationship between landslides and the formation environment and sedimentary characteristics of limestone as an accretionary prism based on comparisons of a wide range of cases in future studies.

Alternanthera sessilis (sessile joyweed).

2021 ◽  
Author(s):  
Julissa Rojas-Sandoval ◽  
Pedro Acevedo-Rodríguez
Keyword(s):  
The United States ◽  
Alkaline Soils ◽  
Floodplain Wetlands ◽  
Invasive Weed ◽  
Ephemeral Pools ◽  
Disturbed Areas ◽  
The Pacific ◽  
Dry Conditions ◽  
Noxious Weed ◽  
Black Cotton Soils

Abstract A. sessilis is a pioneer species typically growing on disturbed areas and in wetland habitats, and regarded as a fast-growing highly invasive weed. It is adapted to grow on a range of soil types ranging from poor sandy or alkaline soils, to loam or black cotton soils. It is also able to grow in seasonally-waterlogged areas as well as in areas with extreme dry conditions (Holm et al., 1997). A. sessilis can be found invading floodplain wetlands, margins of rivers, streams, canals, ditches, ponds, reservoirs, tanks, marshes, swamps, wet low-lying ground, ephemeral pools, seasonal pans and damp forest. This species is also a weed in fields with sorghum, millet, Eleusine spp., maize, cotton, cassava, cereal crops, pastures, and vegetable farms (Gupta, 2014). Consequently, this species has been listed as invasive in India, South Africa, Namibia, Spain, Hawaii and many other islands in the Pacific Ocean (see distribution table for details). It is also listed as a noxious weed in the United States (USDA-NRCS, 2014).

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