scholarly journals The ecological vulnerability of Semarang’s coastal waters, a brief review

2021 ◽  
Vol 919 (1) ◽  
pp. 012028
Author(s):  
R Rositasari ◽  
R Puspitasari
Keyword(s):  
Coastal Waters ◽  
Heavy Metal Contamination ◽  
Core Sample ◽  
Northern Region ◽  
Capital City ◽  
Research Centre ◽  
Industrial Estates ◽  
Central Java ◽  
Research Activities ◽  
Ecological Vulnerability

Abstract As the capital city of the Central Java Province, Semarang has a very unique regional profile. Economic activity in Semarang has accelerated rapidly and many industrial estates have been established, but the latent problem of inundation and subsidence has been a threat in the northern region of the city for almost a century. Under these conditions, the burden of pollution as a by-product of various activities in the coastal and upland areas becomes a threat magnification for ecological sustainability of coastal waters and surrounding areas. This review will reveal the ecological vulnerability of coastal waters based on biogeochemical aspects. The major references for the review were several research papers dan repots based on the research activities of The Research Centre for Oceanography, Indonesian Science Institute (LIPI) in Semarang coastal water on the last decade. Geological studies, heavy metal contamination and retrospection study using benthic foraminifera as proxies based on two core samples are the major aspects on the review. The results show that the eastern coastal of Semarang was more susceptible to ecological disasters such as accretion, pollution of several metals and total suspended solids compared to the western coastal waters. Retrospective study based on core sample showed that Pb and Zn contaminations were occurred higher at the East Flood Canal estuary since 1910, so was the imprint of hypoxia was found since 1939.

Distribution of heavy metals in seawater, sediment and biota of Jinhae Bay, Korea

1994 ◽  
Vol 30 (10) ◽  
pp. 173-177 ◽  
Author(s):  
Lee Chan-Won ◽  
Kwon Young-Tack
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Coastal Waters ◽  
Heavy Metal Contamination ◽  
Heavy Metal Concentration ◽  
Industrial Wastes ◽  
Subsequent Increase ◽  
Zinc Cadmium ◽  
Jinhae Bay ◽  
Copper Lead

Over the past two decades, the coastal waters of Jinhae Bay have been extensively used by coastal communities and industries for the disposal of domestic and various industrial wastes, therefore increasing the level of pollutants in coastal waters with a subsequent increase in sediments, especially of heavy metals. Specific objectives of this research are to investigate the distribution of heavy metal concentration in biota, to compare the concentrations with those in sediment and water and to relate the bioconcentration to the different heavy metals in biota obtained from several sites. Sixty one percent of heavy metals was found in particulate form during the high runoff season and 32% during the dry season. The behavior of the particulate metals after flowing in to the enclosed coastal sea is an important factor in heavy metal contamination. Copper, lead and chromium contamination of sediment was revealed at several sites. The bioconcentration factors (BCFs) of zinc, cadmium, copper, nickel, chromium and lead by the mussel (Mytilus edulis) were determined as 2,900, 2,814, 807, 423, 228 and 127 in the decreasing order, respectively. The areas located nearest to highly populated city and industries exhibited mussels with the largest accumulation of copper, lead and chromium.

Overview on Fusion Nuclear Technology Experimental Testing

2016 ◽  
Vol 2 (2) ◽  
Author(s):  
Slavomir Entler ◽  
Jan Kysela
Keyword(s):  
Eutectic Alloy ◽  
Nuclear Reactor ◽  
Experimental Testing ◽  
High Heat ◽  
Neutron Field ◽  
Research Centre ◽  
Nuclear Technology ◽  
High Heat Flux ◽  
Research Activities ◽  
Experimental Facilities

Research Centre Rez in the Czech Republic has carried out a number of research and development activities on the nuclear technology of the fusion reactor International Thermonuclear Experimental Reactor (ITER). These contributions have led to the development of numerous experimental facilities. The initial experimental research related to ITER was focused on the technology of the LiPb eutectic alloy, and a production unit and technological channel were constructed. At a later time, material tests were performed in the neutron field of the LVR-15 research nuclear reactor. Interactions of EUROFER 97 and the LiPb eutectic alloy were examined in in-pile and out-pile tests, and the technology of the LiPb was developed. First wall mock-ups were in-pile and out-pile tested under high heat flux (HHF) cycle loads. At present, a full-size mock-up of the ITER Test Blanket System (TBS) and an HHF testing complex are constructed. This paper provides an overview of the research activities and experimental facilities.

scholarly journals Hydrodynamics characteristics of the small ships rudders

2020 ◽  
Vol 43 ◽  
pp. 21-26
Author(s):  
Dan Obreja
Keyword(s):  
Design Process ◽  
Computer Code ◽  
Short Description ◽  
Research Centre ◽  
Research Activities ◽  
Optimum Position ◽  
Practical Research ◽  
Small Ship ◽  
Control Forces ◽  
Selection Of

The estimation of the hydrodynamics characteristics of the small ships rudders is an important issue in the initial design process. The manoeuvring performance depends on the type and geometry of the rudder. The control forces and moments generated by the rudder deflection can be calculated on the basis of the hydrodynamics characteristics of the rudder. A short description of the Mordvinov theoretical model is presented in this paper, in order to determine the hydrodynamics characteristics of a small ship rudder, with the propeller and hull influences. On the basis of the control forces and moments, the optimum position of the rudder stock and the selection of the steering gear can be performed. Using the Mordvinov method, the computer code PHP NM-MAN-HC was develop at the Research Centre of the Naval Architecture Faculty of “Dunarea de Jos” University of Galati. This computer code is integrated in the software platform PHP (Preliminary Hydrodynamics Performance) and is used for didactic applications and practical research activities in the small ship design process

scholarly journals PENGARUH PENDIDIKAN KESEHATAN TERHADAP PENINGKATAN PENGETAHUAN DAN PENURUNAN KEPADATAN TIKUS DI SUMURBOTO, KECAMATAN BANYUMANIK, SEMARANG

2019 ◽  
Vol 11 (1) ◽  
pp. 47-52
Author(s):  
Martini Martini ◽  
Sri Yuliawati ◽  
Retno Hestiningsih ◽  
Nissa Kusariana ◽  
Sudjut Haryanto
Keyword(s):  
Health Education ◽  
Educational Intervention ◽  
Case Fatality ◽  
Knowledge Score ◽  
Capital City ◽  
Education Intervention ◽  
Research Subjects ◽  
Central Java ◽  
Health Education Intervention ◽  
Before And After

Semarang, the capital city of Central Java Province, is one of the endemic areas in Indonesia with increasing case fatality rate in the last three years. Accordingly, the educational intervention is fundamentally requested. The aim of the study was to evaluate the influence of health education intervention on  the community knowledge improvement and its implication for reducing the rat populations. The study was performed using field experiment with pretest and post test designs. A total of 55 cadres and housewives joining on the various education program at Sumurboto Village, Banyumanik Sub district, Semarang was used as research subjects. The health education interventions introduced in the study were counselling and mentoring. ,Data were analyzed using paired t-test. The results revealed that the knowledge of the subject research significantly increased and the rat populations significantly decreased after being given the educational intervention. The rat species identified in Sumurboto Village were Rattus norvegicus, R. tanezumi, R. exulans and Suncus murinus. The knowledge score before and after the intervention was 80.87 and 88.83 respectively. Meanwhile, the rat populations measured by trap success method reduced from 8% to 6% after the intervention. Nevertheless, the rat population in Sumurboto Village is considerably relative high indicating that the village possessed a high risk on leptospirosis attack. It is strongly suggested that the health education intervention in the community should be regularly maintained in order to accelerate the knowledge of leptospirosis and reduce the rat populations.   

scholarly journals A32 Genomic surveillance of Zika virus transmission in the Amazonas State, Brazil

2019 ◽  
Vol 5 (Supplement_1) ◽  
Author(s):  
Marta Giovanetti ◽  
Jaqueline Goes de Jesus ◽  
Quick Joshua ◽  
Ingra Morales Claro ◽  
Joilson Xavier Junior ◽  
...  
Keyword(s):  
Zika Virus ◽  
Disease Surveillance ◽  
Virus Transmission ◽  
Northern Region ◽  
Molecular Dating ◽  
Capital City ◽  
Bootstrap Support ◽  
Transmission Potential ◽  
North Brazil ◽  
Amazonas State

Abstract Zika virus (ZIKV) has caused an unprecedented epidemic linked to severe congenital syndromes. Transmission of ZIKV in the Americas was first confirmed in May 2015 in northeast Brazil, though the virus was likely introduced 1–2 years prior to its detection. Manaus, the capital city of the Amazonas State, the largest territory of any state in Brazil and the main economic center in the northern region, reported between 2016 and 2017 more than 2,327 suspected cases of ZIKV infection. To gain insights into the timing, source, and likely route(s) of ZIKV introduction in the Amazonas State, we tracked the virus by sequencing ZIKV genomes from infected patients. Using nanopore sequencing technology, we generated 56 Brazilian ZIKV genomes from Manaus city in the Amazonas state, sampled from human cases. On the basis of available sequences of isolates from the Americas, the Manaus sequences, we analyzed fell within a single strongly supported monophyletic clade (bootstrap support = 99%, posterior support = 1.00) that belongs to the Asian genotype. Genetic analysis suggests the outbreak most likely originated from transmission cycles not previously identified in North Brazil and not from a separate introduction into the Americas. Molecular dating analysis indicates that the outbreak was caused by a single founder strain that is estimated to have arrived in Manaus around February 2015. By analyzing surveillance and genetic data, we discovered that ZIKV moved among transmission zones in Manaus. Geographical analysis further indicates that the Northern part of the Manaus regions has a high transmission potential for ZIKV. Our work illustrates that near-real time genomics in the field can augment traditional approaches to infectious disease surveillance and control. Estimated dates for the international spread of ZIKV from the north region indicate the persistence of the virus transmission in recipient regions. Our study provides an understanding of how ZIKV initiates transmission in new regions.

Process-Integrated Manufacturing and Embedding of Novel Piezoelectric Sensor Modules into Glass Fibre-Reinforced Polyurethane Composite Structures

2015 ◽  
Vol 825-826 ◽  
pp. 563-570 ◽  
Author(s):  
Sirko Geller ◽  
Maik Gude
Keyword(s):  
Composite Structures ◽  
Experimental Studies ◽  
Piezoelectric Sensor ◽  
Research Centre ◽  
Adhesion Properties ◽  
Integrated Manufacturing ◽  
Polyurethane Composite ◽  
Research Activities ◽  
Significant Step ◽  
Component Manufacturing

Due to an increasing use of composite materials in various applications and related open questions concerning structural health monitoring and damage detection, the realisation of function integrating lightweight structures with sensory properties is subject of numerous research activities. Main objective is the transfer of already in laboratory and prototype scale established methods for the integration of sensory elements on serial applications. Here, combining the previously separated processing steps sensor manufacturing, component manufacturing and sensor integration can help to make a significant step forwards. Therefore, as part of the activities in the Collaborative Research Centre/Transregio (CRC/TR) 39, a highly productive spray coat method based on the long fibre injection (LFI) process is developed, which allows the process-integrated manufacturing and embedding of novel piezoelectric sensor modules into fibre-reinforced polyurethane composite structures.Based on studies on the technological implementation of the newly developed process, theoretical and experimental studies for contacting and polarisation of the novel sensor elements are presented. In addition, the characterisation of the adhesion properties of thermoplastic films on the used fibre-reinforced polyurethane composites is part of the presented research to evaluate the possibility of integrating thermoplastic-compatible piezo modules for actuator applications.

scholarly journals THE NEW EUROPEAN TRANSPORT RESEARCH ACTIVITIES

Transport ◽  
2004 ◽  
Vol 19 (4) ◽  
pp. 191-194
Author(s):  
Igor Kabashkin
Keyword(s):  
Research Centre ◽  
European Research ◽  
European Committee ◽  
Research Activities ◽  
In The Beginning

In the beginning of 2004 two European organisations ‐ Organisation for Economic Co‐operation and Development (OECD) and European Committee of Ministers of Transport (ECMT), established the Joint OECD/ ECMT Transport Research Centre. The mission, main areas of research activities and projects of new European research centre are described.

scholarly journals HUBUNGAN KERAPATAN LAMUN DENGAN KELIMPAHAN BAKTERI HETEROTROF DI PERAIRAN PANTAI KARTINI KABUPATEN JEPARA

2016 ◽  
Vol 5 (3) ◽  
pp. 142-149
Author(s):  
Vera Nabila Ariyanti ◽  
Supriharyono Supriharyono ◽  
Niniek Widyorini
Keyword(s):  
Key Words ◽  
Correlation Coefficient ◽  
Food Chain ◽  
Coastal Waters ◽  
Strong Correlation ◽  
Purposive Sampling ◽  
Central Java ◽  
Primary Producer ◽  
Materials Used ◽  
Descriptive Method

ABSTRAK Perairan pantai Kartini merupakan salah satu pantai yang ada di jawa tengah tepatnya di kabupaten Jepara. Perairan pantai Kartini tumbuh beberapa lamun, namun yang paling mendominasi adalah spesies Thalassia sp. Lamun yang merupakan produsen primer atau yang menempati trofik satu dalam sistem rantai makanan dimanfaatkan oleh biota herbivora namun lebih banyak dimanfaatkan oleh detritus feeder. Salah satu detritus feeder yang penting bagi kelangsungan ekosistem lamun yaitu bakteri heterotrof yang merupakan bakteri pengurai. Oleh karena itu perlu diketahui hubungan kerapatan lamun dengan kelimpahan bakteri heterotrof di perairan pantai Kartini kabupaten Jepara. Tujuan dari penelitian ini antara lain adalah mengetahui kerapatan lamun perairan pantai Kartini kabupaten Jepara, mengetahui total bakteri heterotrof pada lamun di perairan pantai Kartini kabupaten Jepara, dan mengetahui hubungan kerapatan lamun dengan kelimpahan bakteri heterotrof. Materi yang digunakan dalam penelitian ini adalah ekosistem lamun dan sampel daun lamun. Metode yang digunakan dalam penelitian ini adalah deskriptif dengan cara sampling purposive sampling. Penelitian dilakukan pada bulan Februari hingga Maret 2016. Hasil yang diperoleh Kerapatan lamun yang terdapat di perairan pantai Kartini, kabupaten Jepara adalah rata rata 67 tegakan/m2, dengan kerapatan tertinggi adalah 102 tegakan/m2 dan kerapatan terendah adalah 29 tegakan/m2. Kelimpahan total bakteri heterotrof pada lamun di perairan pantai Kartini, kabupaten Jepara yang tertinggi pada pengenceran 104 adalah 173333 x104 upk/ml dan yang terendah adalah 33333 x104 upk/ml. Kerapatan lamun dengan kelimpahan bakteri heterotrof pada perairan pantai Kartini, kabupaten Jepara memiliki hubungan yang kuat karena nilai koefisien korelasi lebih dari 0,600 (r = 0,618). Kelimpahan bakteri dipengaruhi oleh kepadatan lamun, semakin padat lamun maka akan semakin melimpah jumlah bakteri heterotrofnya.Kata kunci: Lamun, Bakteri Heterotrof, Pantai Kartini Kabupaten Jepara.  ABSTRACT The coastal waters of Kartini is one of the coast located in Central Java, Kabupaten of Jepara. Seagrass at the coastal waters dominated by Thalassia sp. As seagrass as a primary producer and the first trophic level organism in the food chain is usually feed by herbivores but it is mostly used by detritus. One of the more important detritus in the ecosystem are the heterothropic bacterias who function as a decomposer. This is why it is important to figure out the correlation between the density of seagrass with the amount of heterothropic bacterias in the waters at the coast of Kartini in Jepara. The purpose of this study is to know the density of seagrass in the waters at the coast of Kartini Kabupaten Jepara, to know the investigate of heterothropic bacterias on Seagrass in the waters at the coast of Kartini Kabupaten Jepara and to analyse the correlation between the density of seagrass with the amount of heterothropic bacterias in the waters at the coast of Kartini Kabupaten Jepara. Materials used for this research are seagrass and samples of seagrass leaves. This research has been conducted in Februari to March 2016. The method used is a descriptive method with purposive sampling. The results obtained were the density of seagrass in the waters at the coast of Kartini was an average of 67 sprouts of seagrass/m2, with the highest density of 102 sprouts of seagrass/m2 and the lowest density of 29 sprouts of seagrass/m2.The total amount of heterothropic bacterias on seagrass in the waters at the coast of Kartini kabupaten Jepara was found at the most of 173333 x 104 upk/ml (diluted at 104) and at the least of 33333 x 104 upk/ml. Density of seagrass has a strong correlation with the amount of heterothropic bacterias in the waters at the coast of Kartini Kabupaten Jepara with a correlation coefficient high than 0,600 (r = 0,618). The amount of bacterias are influenced by the density of seagrass, the higher the density will also increase the amount of heterotrophic bacterias. Key words: Seagrass, Heterotrophic Bacterias, Coast of Kartini Kabupaten Jepara.

scholarly journals Status of soil heavy metals contamination using contamination indices in shallot fields

2021 ◽  
Vol 306 ◽  
pp. 04013
Author(s):  
Triyani Dewi ◽  
Edhi Martono ◽  
Eko Hanudin ◽  
Rika Harini
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Contamination ◽  
Contamination Factor ◽  
Soil Samples ◽  
Limit Values ◽  
Central Java ◽  
Contamination Indices ◽  
Heavy Metals Contamination ◽  
The Status

Monitoring and assessment of heavy metal concentrations in shallot fields are needed to evaluate the potential risk of contamination due to heavy metals. This study aims to define the status of heavy metal contamination in shallot fields using contamination indices. A total of 184 soil samples (0-20 cm) were taken from shallot fields in Brebes Regency, Central Java. The soil samples were analyzed for the concentration of five heavy metals (Cd, Pb, Ni, Cr, and Co) with HNO3 and HClO4 extracts and measured using AAS. Assessment of the status of heavy metals contamination in the soil using contaminant factor (CF), geo-accumulation index (I-geo), and pollution load index (PLI). The mean concentration in shallot fields showed the following order Cr > Ni > Pb > Co > Cd and the concentration were still below critical limit values. Four metals are Pb, Cr, Co, and Ni are low contamination (CF<1), while Cd is considerable until very high contamination factor. Based on I-geo values, shallot fields are practically uncontaminated of Pb, Co, Ni, and Cr (I-geo<1), meanwhile the status of Cd is uncontaminated to moderately contaminated (0<I-geo<1). Generally, the shallot fields in Brebes Regency, Central Java is unpolluted with five metals (PLI<1).

Sign in / Sign up

Export Citation Format

Share Document