RAPID MONITORING OF INDUSTRIAL WASTEWATER BY PIXE AND ANION CHROMATOGRAPHY

2000 ◽  
Vol 10 (03n04) ◽  
pp. 147-153
Author(s):  
M. Tsuji ◽  
K. Kawasaki ◽  
T. Niizeki
Keyword(s):  
Industrial Wastewater ◽  
Water Environment ◽  
Chemical Species ◽  
The Public ◽  
Concentration Method ◽  
Combined Use ◽  
Rapid Monitoring ◽  
Tokyo Institute ◽  
Institute Of Technology ◽  
Anion Chromatography

Selenium in industrial wastewater at sub-ppm level was determined by PIXE spectrometry at the Tokyo Institute of Technology Van de Graaff Laboratory using a 2.5 MeV proton beam. A chemical concentration method was applied for elemental analysis. Other elements ( Mn , Fe , Ni , Cu , Zn , Pb , Hg , Cd , As ) were also found simultaneously. Anion chromatography revealed that selenium forms an oxyanion SeO 32- in wastewater studied. Pb , As and Se of these chemical species are required to lower below the discharge standard to the public water, 0.1ppm, while that of Hg is 0.005ppm. The combined use of these two analysis tools will help for rapid monitoring of the quality in the public water environment.

DETERMINATION OF TRACE ELEMENTS IN RIVER WATER SAMPLE BY PIXE

2000 ◽  
Vol 10 (01n02) ◽  
pp. 57-62 ◽  
Author(s):  
M. Tsuji ◽  
K. Kawasaki ◽  
T. Niizeki ◽  
M. Saitou ◽  
T. Hattori
Keyword(s):  
Water Sample ◽  
River Water ◽  
Detection Efficiency ◽  
River Water Sample ◽  
X Ray ◽  
Concentration Method ◽  
Certified Value ◽  
Tokyo Institute ◽  
Institute Of Technology ◽  
Good Agreement

Transition metal elements and others in river water sample supplied by The Japan Society for Analytical Chemistry (JSAC) were determined by PIXE using 2.5 MeV proton beam at the Tokyo Institute of Technology Van de Graaff Laboratory. The relative detection efficiency for each X-ray of element and its recovery were studied in two methods: "Drop and Dry" and "Concentration" methods. Ten elements ( V , Cr , Mn , Fe , Ni , Cu , Zn , As , Se and Pb ) were determined, being in good agreement with the values certified by JSAC except for Mn . Intensity of K α X-ray of As and L α, X-ray of Pb nearly close to each other could be successfully evaluated using isolated L β X-ray of Pb . Mn was insufficiently recovered to give lower content than the certified value in the present conditions. V that is not listed in the certificate was found to show good agreement with that reported previously. Concentration method using sodium dibenzyldithiocarbamate only could be successfully employed for collecting these elements.

DETERMINATION OF HEAVY METALS IN SALTS BY PROTON INDUCED X-RAY EMISSIONS

2004 ◽  
Vol 14 (03n04) ◽  
pp. 115-124 ◽  
Author(s):  
O. BOLORMAA ◽  
M. TSUJI ◽  
K. KAWASAKI ◽  
T. HATTORI
Keyword(s):  
Heavy Metals ◽  
Toxic Heavy Metals ◽  
Filter Surface ◽  
Concentration Method ◽  
Insoluble Particles ◽  
Direct Irradiation ◽  
Tokyo Institute ◽  
Institute Of Technology ◽  
Track Etch

The samples of common salts available in Japan and Mongolia were analyzed for the presence of heavy elements by PIXE spectrometry using 2.5 MeV proton beam at the Tokyo Institute of Technology Van de Graaff Laboratory. The samples were dissolved in water and insoluble and soluble fractions were determined separately. The soluble constituents were treated with pre-concentration method by using DBDTC to form the complexes appropriate to percolation through a Nuclepore Track - etch Membrane. Insoluble particles were precipitated on the filter surface for subsequent direct irradiation. Combined As and Pb concentrations in insoluble portion of salts were found in the range of 7.2 – 102 ppm based on mass analysis of insoluble materials collected on Nuclepore Track - etch Membrane of the pore diameter 0.4μm. This level of toxic heavy metals makes a caution from the view-point of their safe intake.

Socio economic influences on the restoration and maintenance of the water environment

1998 ◽  
Vol 37 (8) ◽  
pp. 1-7
Author(s):  
Peter Matthews
Keyword(s):  
Water Environment ◽  
Water Utilities ◽  
Water Services ◽  
Economic Issue ◽  
Water Utility ◽  
Political Thinking ◽  
The Public ◽  
Economic Influences ◽  
Mind Set

Protection of the water environment has become a modern socio economic issue in which the sociological pressures for a healthy water environment must be balanced with affordability. Reconciliation of these aspects requires clear political thinking and rigorous methodologies. It also requires a shift in mind-set which considers members of the public as customers. Water utilities are the major users of the water environment and potentially its greatest threat – so good delivery of water services is very important. The presentation addresses the topic through the experience of Anglian Water, a privatised water utility serving Eastern England.

The Virtual Water Gallery: a collaborative science and art project

2021 ◽  
Author(s):  
Louise Arnal ◽  
Martyn Clark ◽  
Stacey Dumanski ◽  
John Pomeroy
Keyword(s):  
Boreal Forests ◽  
Water Environment ◽  
Leading Edge ◽  
Virtual Water ◽  
Pilot Project ◽  
The Arctic ◽  
The Public ◽  
Science And Art ◽  
Quality Degradation ◽  
Collaborative Space

<p>Water is life and so water-related challenges, such as droughts, floods and water quality degradation, affect everyone. Conceptualizing water-related environmental and social problems in novel ways, with engagement between the public and science researchers, may lead to new and more comprehensive solutions to complex problems. A society that makes decisions informed by science and science that approaches problems in a transdisciplinary manner are key elements in finding creative and holistic solutions to the water-related challenges we all face. We believe that art can help co-establish new social norms to help us grasp and tackle water-related challenges in a more holistic manner.</p><p>The Virtual Water Gallery* is a science and art pilot project funded by Global Water Futures (GWF). GWF is a University of Saskatchewan-led research program that is funded in part by the Canada First Research Excellence Fund. Its overarching goal is to deliver risk management solutions, informed by leading-edge water science, to manage water futures in Canada and other cold regions where global warming is changing landscapes, ecosystems and the water environment. Launched in Summer 2020, the Virtual Water Gallery aims to provide a safe, inclusive and collaborative space for fully open discussions between scientists, artists, and a wider public, to explore past, present and future water challenges.</p><p>As part of this pilot project, 13 artists were paired with teams of GWF scientists to co-explore specific water challenges in various Canadian ecoregions and river basins, including the Arctic, the mountains, boreal forests, prairies, farmlands, lakes, rivers, and communities. These collaborations are leading to the co-creation of science and art pieces which will be exhibited online on a Virtual Water Gallery. By making this online exhibition accessible to a global audience, we hope that the co-created art pieces will open creative and informative discussions about urgent water challenges to a wider audience via the gallery space.</p><p>*More information about the Virtual Water Gallery on the GWF webpage: https://gwf.usask.ca/outreach/virtual-water-gallery.php</p>

Development of New Constraction Method for LSBWR

2002 ◽  
Author(s):  
H. Heki ◽  
M. Nakamaru ◽  
T. Maruyama ◽  
H. Hirai ◽  
M. Aritomi
Keyword(s):  
Nuclear Power ◽  
Seismic Isolation ◽  
Three Dimensional ◽  
Operating Cycle ◽  
Construction Period ◽  
Hull Structure ◽  
Plant Equipment ◽  
Tokyo Institute ◽  
Institute Of Technology ◽  
Economic Improvement

LSBWR (Long operating cycle Simplified BWR) is a modular, direct cycle, light water cooled, and small power (100–300MWe) reactor. The design considers requirements from foreign utilities as well as from Japanese. LSBWR is currently being developed by Toshiba Corporation and Tokyo Institute of Technology. Major characteristics of the LSBWR are: 1) Long operating cycle (target: over 15 years), 2) Simplified systems and building, 3) Factory fabrication in module. From the perspective of economic improvement of nuclear power plant, it is needed to shorten the plant construction period and to reduce building volume. In designing LSBWR building, a new building structure, where the hull structure of a ship is applied to floors and walls of LSBWR has been studied. Since the hull structure is manufactured at a shipyard, building module that includes plant equipment becomes possible. The application of the hull structure, which can make large modules at a shipyard, is an effective solution to the lack of laborer and economic improvement. LSBWR is a small size BWR, turbine is smaller size and lighter weight than medium or larger size plant. Then, it has been studied to install a reactor and a turbine in the same building for decreasing building volume. From the view point of standardization, whole building is supported by three dimensional seismic isolation mechanism.

Studies on Materials for Heavy-Liquid-Metal-Cooled Reactors in Japan

2002 ◽  
Author(s):  
Minoru Takahashi ◽  
Masayuki Igashira ◽  
Toru Obara ◽  
Hiroshi Sekimoto ◽  
Kenji Kikuchi ◽  
...  
Keyword(s):  
Cross Section ◽  
Corrosion Test ◽  
Target Material ◽  
Neutron Cross Section ◽  
Steel Corrosion ◽  
Experimental Facility ◽  
Critical Systems ◽  
Energy Research ◽  
Tokyo Institute ◽  
Institute Of Technology

Recent studies on materials for the development of lead-bismuth (Pb-Bi)-cooled fast reactors (FR) and accelerator-driven sub-critical systems (ADS) in Japan are reported. The measurement of the neutron cross section of Bi to produce 210Po, the removal experiment of Po contamination and steel corrosion test in Pb-Bi flow were performed in Tokyo Institute of Technology. A target material corrosion test was performed in the project of Transmutation Experimental Facility for ADS in Japan Atomic Energy Research Institute (JAERI). Steel corrosion test was started in Mitsui Engineering & Shipbuilding Co., LTD (MES). The feasibility study for FR cycle performed in Japan Nuclear Cycle Institute (JNC) are described.

Tokyo Institute of Technology

1990 ◽  
Vol 17 (2) ◽  
pp. 262-270
Author(s):  
Masanori Aritomi
Keyword(s):  
Tokyo Institute ◽  
Institute Of Technology

Design of Vehicle’s Controlling System Used a 4WS Control Method Based on BP Neural Network

2011 ◽  
Vol 201-203 ◽  
pp. 276-280
Author(s):  
Ya Peng Liu ◽  
Yan Tang ◽  
Jia Bin Bi
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Control Method ◽  
Theoretical Method ◽  
Learning Ability ◽  
Controlling System ◽  
Nonlinear Dynamic Characteristics ◽  
Tokyo Institute ◽  
Institute Of Technology ◽  
Technology Institute

In this paper, a 4WS control method based on BP neural network was introduced. It used the BP neural network to simulate the map of vehicle and the nonlinear dynamic characteristics of the tire to avoid large errors that relying on mathematical simulation model of the problem. The 4WS measured data of Tokyo institute of Technology institute of Japan was used and used BP neural network method to identify the nonlinear characteristics of vehicle and tires. System controller’s design is not based on any theoretical method, but on the BP neural network’s self-learning ability. Experimental results show that this method has good controlling characteristics, and it can improve the vehicle’s active safety and manipulating stability effectively.

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