Effects of high and fluctuating pressure on microbial abundance and activity in a water hydraulic system

2002 ◽  
Vol 58 (5) ◽  
pp. 669-674 ◽  
Author(s):  
S. Soini, K. Koskinen, M. Vilenius, J.
Keyword(s):  
Hydraulic System ◽  
Microbial Abundance ◽  
Fluctuating Pressure ◽  
Water Hydraulic

scholarly journals DYNAMIC CHARACTERISTICS OF LOW-PRESSURE WATER HYDRAULIC SYSTEM

2002 ◽  
Vol 2002 (5-1) ◽  
pp. 161-166
Author(s):  
Yoshihiro Yata ◽  
Takeshi Nakada ◽  
Yasuo Sakurai ◽  
Kazuhiro Tanaka
Keyword(s):  
Dynamic Characteristics ◽  
Hydraulic System ◽  
Low Pressure ◽  
Pressure Water ◽  
Water Hydraulic

The Retrospects and Prospects of Pure Water Hydraulic Technology

2012 ◽  
Vol 201-202 ◽  
pp. 979-982 ◽  
Author(s):  
Feng Xu ◽  
Li Xiang Zhang
Keyword(s):  
Hydraulic System ◽  
Low Cost ◽  
Pure Water ◽  
Chemical Properties ◽  
Simple System ◽  
Hydraulic Oil ◽  
Physico Chemical ◽  
Water Hydraulic ◽  
Research Situation ◽  
The Ideal

Pure water hydraulic technology attracts more and more attention of people due to no pollution, low cost, simple system, and many other advantages. This paper compares physico-chemical properties between pure water and hydraulic oil, concludes that pure water is the ideal medium for hydraulic system. Then it discusses the development of pure water hydraulic technology, introduces the present research situation and development of pure water hydraulic components from home to abroad in the future.

1P1-M04 Functional evaluation of water hydraulic system used ICN

2007 ◽  
Vol 2007 (0) ◽  
pp. _1P1-M04_1-_1P1-M04_2
Author(s):  
Akinori FUKUMORI ◽  
Masatomo KOSAKA ◽  
Junya KITO ◽  
Takeo OOMICHI
Keyword(s):  
Hydraulic System ◽  
Functional Evaluation ◽  
Water Hydraulic

157 Sensorless Cylinder Velocity Control of Water Hydraulic System

2014 ◽  
Vol 2014 (0) ◽  
pp. 25-26
Author(s):  
Takashi OKAMOTO ◽  
Kazuhisa ITO ◽  
Shigeru IKEO ◽  
Koji TAKAHASHI
Keyword(s):  
Hydraulic System ◽  
Velocity Control ◽  
Water Hydraulic

scholarly journals EFFECT OF TANK DESIGN AND TWO-PHASED FILTRATION ON CLEANLINESS LEVEL OF WATER HYDRAULIC SYSTEM

2005 ◽  
Vol 2005 (6) ◽  
pp. 479-484
Author(s):  
Hannu RIIPINEN ◽  
Sari SOINI ◽  
Jaakko A. PUHAKKA ◽  
Kari T. KOSKINEN ◽  
Matti VILENIUS
Keyword(s):  
Hydraulic System ◽  
Water Hydraulic ◽  
Tank Design

scholarly journals 1P2-A08 Development of water hydraulic system simulator considering leaks(Eco Green Mechatronics)

2014 ◽  
Vol 2014 (0) ◽  
pp. _1P2-A08_1-_1P2-A08_4
Author(s):  
Yugo ITO ◽  
Kiyoshi SAKAMOTO ◽  
Toshiyuki Sugiyama ◽  
Takeo OOMICHI
Keyword(s):  
Hydraulic System ◽  
Water Hydraulic

scholarly journals A study on simulation of a water-hydraulic system for a molding press.

2002 ◽  
Vol 33 (4) ◽  
pp. 99-106 ◽  
Author(s):  
Kazushi SANADA ◽  
Makoto FUKUTOMI ◽  
Kinya FUJINO ◽  
Kozo YOSHIKAWA ◽  
Shunsuke AKAMATSU ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Water Hydraulic

Microbial water quality and diversity in hydraulic systems using tap water as a pressure medium

2000 ◽  
Vol 41 (12) ◽  
pp. 215-222 ◽  
Author(s):  
S. M. Soini ◽  
K. T. Koskinen ◽  
M. Vilenius ◽  
J. A. Puhakka
Keyword(s):  
Hydraulic System ◽  
Tap Water ◽  
Pilot Scale ◽  
Hydraulic Systems ◽  
Water Hydraulics ◽  
Pressure Medium ◽  
Viable Bacteria ◽  
Water Hydraulic ◽  
Cell Densities

Water hydraulics uses tap water or demineralised water as a pressure medium and has fewer environmental impacts than oil-using hydraulics. The applicability is restricted by the microbial quality of the medium. The objectives of this study were to determine whether microbes grow in the pressure medium of a water hydraulic system, biofilm is formed on the surfaces and to describe the diversity of bacteria that survive and grow in water hydraulic systems. A pilot-scale water hydraulic system was used in the experiments. The viable counts in the pressure medium increased in three days from 102 to 3 ×104 cfu/ml followed by a gradual decrease towards the steady-state concentration of 6× 1034 cfu/ml. The total cell numbers decreased from 3×105 to 2 ×104 cells/ml during the three weeks of operation indicating attachment onto the system surfaces as biofilms. The biofilm cell densities on collector slide surfaces varied between 7 ×103 and 1.2 ×104 cells/cm2 after 21 days of operation. The phosphatase activity in the pressure medium was in conformity with the numbers of viable bacteria. The enzymatic activities (α- and β- glucosidase, phosphatase, aminopeptidase) varied between 0.4 and 300 nmol/lh. The diversity of bacteria growing in the system was wide and differed from that of tap water.

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