scholarly journals HydroMoth: Testing a prototype low‐cost acoustic recorder for aquatic environments

Author(s):  
Timothy A. C. Lamont ◽  
Lucille Chapuis ◽  
Ben Williams ◽  
Sasha Dines ◽  
Tess Gridley ◽  
...  
2016 ◽  
Vol 3 (3) ◽  
Author(s):  
T. Chailloux ◽  
A. Capitaine ◽  
B. Erable ◽  
G. Pillonnet

AbstractMicrobial fuel cells (MFC’s) are promising energy harvesters to constantly supply energy to sensors deployed in aquatic environments where solar, thermal and vibration sources are inadequate. In order to show the ready-to-use MFC potential as energy scavengers, this paper presents the association of a durable benthic MFC with a few dollars of commercially-available power management units (PMU’s) dedicated to other kinds of harvesters. With 20 cm


2018 ◽  
Vol 69 (3) ◽  
pp. 473 ◽  
Author(s):  
D. A. Crook ◽  
B. J. Adair ◽  
L. J. Hetherington

Underwater acoustic and timed-release systems are commonly deployed with sensors and other equipment for ecological and oceanographic research in aquatic environments. These systems allow equipment deployed at depth to be remotely released from their moorings for retrieval. However, a current limitation is that most systems do not incorporate mechanisms for retrieval of the mooring anchor and attachments (e.g. shackles, cable). Herein we provide a detailed description and evaluation of a ‘retrieval pod’ that can be attached directly to remotely released underwater devices to facilitate mooring retrieval. The system was tested using acoustic release telemetry receivers under field conditions in a large estuary in the Northern Territory, Australia. Six receivers fitted with pods were retrieved from the field after two consecutive 6-month deployments (12 retrievals in total) with no failed mooring retrievals. Although our tests were confined to shallow depths (<8m), it should be straightforward to modify the system for use in deeper water by increasing the spool capacity. The retrieval pods are reusable, require minimal construction skills and can be assembled from basic equipment available at most hardware or boating stores, making them a convenient and low-cost option for the retrieval of moorings deployed with remote release systems.


UNICIÊNCIAS ◽  
2018 ◽  
Vol 22 (1) ◽  
pp. 38
Author(s):  
Patrícia Tâmara Alves Rodrigues ◽  
Ravely Casarotti Orlandelli

Diversos poluentes – tais como: os compostos orgânicos e inorgânicos e metais pesados, resultantes de atividades antrópica – contribuem com a degradação de ambientes terrestres e aquáticos. Nesse cenário, surge a fitorremediação: uma técnica de biorremediação, em que determinadas espécies de plantas são utilizadas como agentes de descontaminação, removendo, imobilizando ou tornando os contaminantes menos ofensivos ao ecossistema. Embora recente, essa técnica tem apresentado respostas positivas concernentes à descontaminação de água e solos. Assim, o presente artigo teve como objetivo relacionar diferentes espécies de plantas com potencial remediador frente a diversos tipos de contaminantes. Para tanto, foi realizada uma revisão da literatura científica nacional e internacional, a partir da busca de estudos disponíveis no Google Acadêmico, PubMed, Portal de Periódicos da CAPES, SciELO, além de livros de referência, dissertações e teses. As publicações analisadas atestaram que, embora seja uma tecnologia ainda em desenvolvimento, são notáveis diversas vantagens da fitorremediação, como o baixo custo de implantação e sua natureza não invasiva. Além disso, pode ser destacado o potencial fitorremediador recentemente descrito para diferentes espécies vegetais.Palavras-chave: Fitorremediação. Descontaminação Ambiental. Metais Pesados. Herbicidas. Efluentes Industriais.AbstractSeveral pollutants – such as organic and inorganic compounds and heavy metals, resulting from anthropic activities – contribute to the errestrial and aquatic environments degradation. In this scenario, phytoremediation emerges: a bioremediation technique in which certain plant species are used as decontamination agents, removing, immobilizing or making the contaminants less offensive to the ecosystem. Although recent, this technique has presented positive results concerning the water and soil decontamination. Thus, the present article aimed at relating different plant species with potential to remediate different types of contaminants. For this, a review of the national and international scientific literature was carried out, based on the search of studies available in Google Scholar, PubMed, CAPES Periodicals Portal, SciELO, as well as reference books, dissertations and theses. The analyzed publications show that, although it is a technology still in development, several advantages of phytoremediation are remarkable, such as the low cost of implantation and its noninvasive nature. Moreover, the phytoremediation potential recently described for different plant species can be higlighted.Keywords: Phytoremediation. Environmental Decontamination. Heavy Metals. Herbicides. Industrial Effluents.


2019 ◽  
Vol 16 (31) ◽  
pp. 74-83
Author(s):  
Daniele da Silva OLIVEIRA ◽  
Wallas Douglas de Macêdo SOUZA ◽  
Luiz Di SOUZA ◽  
Anne Gabriella Dias SANTOS ◽  
Vinícius Patrício da Silva CALDEIRA

Heavy metals are often released into aquatic environments through various sources of industrial processes. However, conventional treatment technologies demand high cost and/or are inefficient for the recovery of these resources. In this context, the technical application of adsorption has been highlighted by its simplicity and practicality, especially when zeolites are used as adsorbents due to their excellent physicalchemical and textural properties, among them: their high availability, high selectivity and low cost. The present work characterized and evaluated the performance of Na-ZSM-5, Na-ZSM-12, NH4-ZSM-5 and NH4-ZSM-12 zeolites on barium adsorption as an alternative for the treatment of produced water. The Na-ZSM-5 and Na-ZSM-12 zeolites were synthesized by the hydrothermal method and subjected to ion exchange to obtain the ammoniacal form (NH4-ZSM-5 and NH4-ZSM-12). The characterization was done by: DRX, SEM, FRX and Adsorption / Desorption of Nitrogen, and barium concentration was measured by Atomic Absorption Spectroscopy (AAS). The adsorption studies were conducted under agitation at the times of 1, 6, 12 and 24 h. The results were promising for this application, because the Na-ZSM-5 zeolite presented the highest adsorption capacity, a fact related to its textural properties (volume and area of micropores).


2008 ◽  
Vol 51 (5) ◽  
pp. 1071-1077 ◽  
Author(s):  
Maria Loreto Nazar ◽  
Luiz Erlon Araujo Rodrigues ◽  
Iracema Nascimento

This work studied the effects caused by five different formulae of gasoline on the stability of the lysosomes isolated from the liver of the tilapia fish (Oreochromis niloticus). The functional integrity of the lysosomal membranes was evaluated via the acid phosphatase activity. The results showed that there were significant changes in the stability of the lysosomes exposed to the presence of the hydrocarbons in the environment. Therefore, considering the method's simplicity, the sensitivity of the responses and its low cost the assessment of the lysosomal activity could be an important tool for the study of the effects of pollution in the aquatic environments.


2021 ◽  
Vol 9 ◽  
Author(s):  
Can Liu ◽  
Li Tan ◽  
Liming Zhang ◽  
Weiqian Tian ◽  
Lanqing Ma

Antibiotic pollution is becoming an increasingly serious threat in different regions of China. The distribution of antibiotics in water sources varies significantly in time and space, corresponding to the amount of antibiotics used locally. The main source of this contamination in the aquatic environment is wastewater from antibiotic manufacturers, large scale animal farming, and hospitals. In response to the excessive antibiotic contamination in the water environment globally, environmentally friendly alternatives to antibiotics are being developed to reduce their use. Furthermore, researchers have developed various antibiotic treatment techniques for the degradation of antibiotics, such as physical adsorption, chemical oxidation, photodegradation, and biodegradation. Among them, biodegradation is receiving increasing attention because of its low cost, ease of operation, and lack of secondary pollution. Antibiotic degradation by enzymes could become the key strategy of management of antibiotics pollution in the environment in future. This review summarizes research on the distribution of antibiotics in China’s aquatic environments and different techniques for the degradation of antibiotics. Special attention is paid to their degradation by various enzymes. The adverse effects of the pollutants and need for more effective monitoring and mitigating pollution are also highlighted.


2019 ◽  
Vol 146 ◽  
pp. 326-332 ◽  
Author(s):  
Sara Sadat Hosseini ◽  
Hasan Pasalari ◽  
Nader Yousefi ◽  
Amir Hossein Mahvi

Author(s):  
Y. L. Chen ◽  
S. Fujlshiro

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.


Author(s):  
J. D. Muzzy ◽  
R. D. Hester ◽  
J. L. Hubbard

Polyethylene is one of the most important plastics produced today because of its good physical properties, ease of fabrication and low cost. Studies to improve the properties of polyethylene are leading to an understanding of its crystalline morphology. Polyethylene crystallized by evaporation from dilute solutions consists of thin crystals called lamellae. The polyethylene molecules are parallel to the thickness of the lamellae and are folded since the thickness of the lamellae is much less than the molecular length. This lamellar texture persists in less perfect form in polyethylene crystallized from the melt.Morphological studies of melt crystallized polyethylene have been limited due to the difficulty of isolating the microstructure from the bulk specimen without destroying or deforming it.


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