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Volume 53 (1999)
- Issue 6 Pages 409-
- Issue 5 Pages 320-
- Issue 4 Pages 224-
- Issue 3 Pages 132-
- Issue 2 Pages 70-
- Issue 1 Pages 2-
Volume 53, Issue 5
Displaying 1-10 of 10 articles from this issue
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Consideration on Charged Mosaic MembraneAkira YAMAUCHI1999 Volume 53 Issue 5 Pages 320-327
Published: 1999
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSIn this paper, relationship between different charge structure within membrane and transport properties reviewed. In particular, the properties concerning charged mosaic membrane which has two different fixed charges and the parallel arrayed structures within membrane were examined. Three main membrane parameters were estimated from the observations of volume flux and salt flux across the charged membrane, and the results suggested the separation between electrolytes and non-electrolytes is satisfied and the salt enrichment or desalination due to pressure dialysis will be possible using the charged mosaic membrane.View full abstractDownload PDF (5561K) -
Teruyuki HONDA1999 Volume 53 Issue 5 Pages 328-340
Published: 1999
Released on J-STAGE: February 19, 2013
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Takahide TSUCHIYA1999 Volume 53 Issue 5 Pages 341-349
Published: 1999
Released on J-STAGE: February 19, 2013
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Keiko HATAE1999 Volume 53 Issue 5 Pages 350-355
Published: 1999
Released on J-STAGE: February 19, 2013
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Is Salt Related to Hypertension?Toshio HASHIMOTO1999 Volume 53 Issue 5 Pages 356-363
Published: 1999
Released on J-STAGE: February 19, 2013
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Mami OKAMOTO, Akikuni USHIKUBO1999 Volume 53 Issue 5 Pages 364-372
Published: 1999
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSRainfall was collected in bulk by means of a bulk type filtered acid precipitation sampler at 5 different collection points. Setagaya, Okutama, Atsugi, Ninomiya and Fuji in the Kanto area. The collection began in September 1996 and lasted for one year.
Concentrations of Na+, NH4+, K+, Ca2+, Mg2+, Cl-, NO3+ and SO4+ ions in the rain-fall as well as pH values were measured by means of Ion chromatography and pH meter. The mean value of pH in rainfall was between 4.47 and 5.36.
An investigation was carried out to evaluate the ratio of Ca2+, Mg2+, Cl- and SO4+ ions that originated in sea salt to the total ions in the acid rain, based on the assumption that all Nat ion are derived from sea salt.
Therefore, the average contribution percentage of ss-K+, ss-Ca2+, ss-Mg2+, ss-Cl- and ss-SO4+ ions originated from sea salt (ss-) were 11.39, 1.76, 44.45, 70.45 and 11.98% espectively.
Volume-weighted precipitation of sea salt ions decreased with an increase in distance from North latitude 35 degrees, except from Setagaya. Setagaya was highly polluted by human work sources. Because it is estimated that sea salt ions were captured and then concentrated in the polluted air. Volume-weighted precipitation of non sea salt ions were etagaya>Atsugi>Fuji, inomiya> Okutama In order of amount.View full abstractDownload PDF (6021K) -
at Khung Krabaen Bay (Thailand)Katsuhiko MATSUNAGA, Wirongrong THIMDEE, Gridsada DEEN, Joompol SANGUA ...1999 Volume 53 Issue 5 Pages 373-376
Published: 1999
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSCarbon, nitrogen content and stable carbon isotope abundance (δ13C) were measured in mangrove leaves collected from seven species as well as in mangrove and canal sediments. The C/N ratio in the senescent leaves is 103±20 which is quite different from the ratio of 15.2±1.4 in mangrove sediments. Thus, it is difficult to explain the source of organic matter in the sediments using C/N data. On the other hand,(δ13C values in the senescent leaves and mangrove sediments were-30.2±1.3 and-26.3±1.0‰, respectively. The δ13C values in sediments were several units more positive than those in the leaves. However, the source of organic matter in the sediments is assumed to be in the leaves because isotopic fractionation in sediments takes place and the value becomes several units more positive. Waste water from shrimp ponds flows through the canals. The δ13C values in the canal sediments were -26.4± 1.0‰ which is close to the value in mangrove sediments, indicating that the canal sediments will not be affected by shrimp feed δ13C=-22.5±0.4‰).View full abstractDownload PDF (2485K) -
Kazuo OZASA, Tomoaki TAKADA, Hidetoshi IZUMI, Kazuo TSUZURA1999 Volume 53 Issue 5 Pages 377-385
Published: 1999
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSOwing to ettringite reaction, the ash from a coal-fired fluid bed combustion boiler turns into a strong solid brick after it is kneaded with water. We tried to utilize it as a road-base material. The process consists of reducing ash grain size by means of a crusher, measuring, mixing with water, kneading, molding, curing at 60°C after aging a little while at the room temperature, and then crushing. We organized a project team for the research and development activities consisting of the Foundation Center for Coal Utilization as an organizer, Kawasaki Heavy Industries Co., Ltd. for the basic research, Naruto Salt Manufacturing Co., Ltd. for the pilot plant (manufacturing road-base material) test, and Nippon Hodo Co., Ltd. for the assessment of product material. The road-base material product has proved to be safe for the environment, meeting asphalt pavement standards, and is good for road construction work and practically durable for heavy traffic.View full abstractDownload PDF (6053K) -
Hideo IWAHASHI, Masahiro KISHI, Osamu MIYATAKE1999 Volume 53 Issue 5 Pages 386-394
Published: 1999
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA new Performance evaluation method for an energy-saving high recovery RO seawater desalination process was investigated.
First of all, analytical solution for the flow of a single hollow fiber was formulated from the longitudinal flow and pressure distributing equation of the permeated water.
As a result, it was discovered that permeated water flow was in proportion to the effective driving pressure, assuming the permeated water pressure was zero, and that the permeated water pressure could be treated as the correction coefficient of this driving pressure.
The correction coefficient is a characteristic value of the module, and independent of the temperature.
Secondly, using the fundamental formula derived for numeral calculation of one-dimensional flow, the distribution of the flux, the density, etc., in the module were calculated.
Finally, based on the above fundamental formula, a new approximate analysis applicable to the high recovery rate was formulated.
Considering the high recovery rate, the permeated water pressure was closely analogous to the quadratic equation of saline density.
Though the equation was a little complicated, the calculation error in comparison to the numerical solution was found to be 0.5% or less.
This calculation error was decreased to 1/10 of the former simple calculation method.
In conclusion, the new approximate analysis equation was confirmed to be useful.View full abstractDownload PDF (5256K) -
Noboru OGATA1999 Volume 53 Issue 5 Pages 398-399
Published: 1999
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (1246K)
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