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  • 1
    Electronic Resource
    Electronic Resource
    Tribological Behavior of Phosphor Bronze against SAE52100 Steel under Different Lubricants (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 852-855 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The friction and wear properties of phosphor bronze discs sliding against SAE52100 steelballs were evaluated using an Optimol SRV reciprocating friction and wear tester under thelubrication of pure poly-alpha-olefin (PAO) and PAO containing commercial phosphite ester, zincdialkyldithiophosphate (ZDTP) and oleic acid additives. The morphologies of the worn surfaces ofthe phosphor bronze discs were observed using a scanning electron microscope (SEM). In addition,the elemental compositions and chemical states of several typical elements on the worn surfaces ofthe phosphor bronze discs were examined by means of X-ray photoelectron spectroscopy (XPS). Thefindings indicated that the phosphor bronze discs exhibited higher wear resistance under thelubrication of PAO containing phosphite ester than pure PAO, PAO containing ZDTP, and PAOcontaining oleic acid. Also, the phosphor bronze discs exhibited stable friction coefficients as low as0.09-0.11 when lubricated with PAO containing phosphite ester. According to the XPS analyses, itwas considered that the formation of CuO and phosphate led to lower friction coefficient and highwear resistance of phosphor bronze specimens lubricated with PAO containing phosphite ester. In thecase of the phosphor bronze specimens lubricated with PAO containing ZDTP and oleic acid, theformation of organic compounds seemed to lead to lower friction coefficient, but did not seem toaffect the wear resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.852.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Tribological Properties of MoS〈sub〉2〈/sub〉-Coated Gray Cast Irons with Some Different Matrix Phases under the Boundary Lubricating Conditions (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 788-791 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, Fe-2.0Si-4.6C (mass%) gray cast iron disk specimens with three differentmatrix phases were coated with MoS2 using pressure spraying, and the friction and wear propertiesof the specimens were investigated against AISI52100 steel and polytetrafluoroethylene balls underthe lubrication of oil using an Optimol SRV friction tester. When AISI52100 steel balls were usedas the paired material, all of the MoS2-coated gray cast iron specimens showed lower frictioncoefficients and higher wear resistance than the non-coated disk specimens. On the other hand,MoS2-coated gray cast iron specimens exhibited higher friction coefficients than non-coated diskspecimens for the most part, when polytetrafluoroethylene balls were used as the paired material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.788.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    High Temperature Tribology and Solid Lubrication of Advanced Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1088-1091 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The high-temperature friction and wear characteristics of different ceramics and ceramicmatrix composites (CMCs) incorporated with various solid lubricants have been investigated from roomtemper- ature to 1000oC. The solid lubricants considered in this paper include representative preciousmetals, hexagonal boron nitride, graphite, fluorides, soft oxides, chromates, sulfates, and combinations ofvarious solid lubricants. General design considerations relevant to solid lubrication were proposed on thebasis of friction and wear data of self-lubricating CMCs. The self-lubricating composites incorporatedwith SrSO4 or/and CaSiO3 exhibits low and stable friction coefficients of 0.2 to 0.3 and small wear rates inthe order of 10-6 mm3/Nm from room temperature to 800oC. The optimized composites appear to bepromising can- didates for long-duration, extreme environment applications with low friction and smallwear rate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1088.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Spark Plasma Sintered ZrO〈sub〉2〈/sub〉(Y〈sub〉2〈/sub〉O〈sub〉3〈/sub〉)-Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉-SrSO〈sub〉4〈/sub〉 Self-Lubricating Nanocomposites for High Temperature Tribological Applications (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1429-1432 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Spark plasma sintering is employed to synthesize a variety of self-lubricating ZrO2(Y2O3)-Al2O3 matrix nanocomposites by tailoring the chemical compositions and by adjusting the sinteringparameters. Different additives are incorporated into the nanocrystalline ceramics of ZrO2(Y2O3)-20wt.% Al2O3 to evaluate their potentials as effective high temperature solid lubricants from roomtemperature to 800oC by using a high temperature friction and wear tester in sliding against alumina ballin air. The density, microstructure, hardness and tribological properties of the sintered nanocompositeshave been investigated, as contrasted with the unmodified ceramics, to obtain a better understanding oflubrication mechanisms over a wide temperature range. The ZrO2(Y2O3)-Al2O3-SrSO4 compositeexhibits steady-state friction coefficients of less than 0.2 and wear rates in the order of 10-6 mm3/Nm overa broad temperature range from room temperature to 800oC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1429.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Evaluation of Tribological Properties of a Cathodic Arc Ion-Plated CrSiN Coating under Both Unlubricated and Boundary-Lubricated Conditions (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1747-1752 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The friction and wear characteristics of a cathodic arc ion-plated CrSiN coating in slidingagainst different counter materials have been investigated under both unlubricated andboundary-lubricated conditions. Under boundary-lubricated conditions, the CrSiN coating exhibits afriction coefficient of 0.12 to 0.20 against a SAE 52100 steel ball and of 0.04 to 0.07 against aCrN-coated steel pin, depending on wear parameters used. The effects of load, temperature andcounter materials on friction and wear of the CrSiN coating were discussed. The worn surfaces andwear debris generated under different wear conditions were examined by means of scanning electronmicroscopy and Raman spectroscopy to identify the tribochemical reaction and phase structuresgenerated during the wear process. Under unlubricated conditions, iron-based oxides formed insliding against a steel ball, while some chromium oxides were identified on worn surfaces of theCrSiN coating in sliding against an alumina ball in air
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1747.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    High-Temperature Tribological Properties of Barite-Type-Sulfate-Coated Substrates with Different Isoelectric Points (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1200-1205 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present study, Al2O3, (ZrO2-3mol% Y2O3)-39.6mass% Al2O3, Si3N4 and MgOsubstrates coated with SrSO4 particles were prepared, and their high-temperature tribologicalproperties were investigated. It was clarified that SrSO4 worked as solid lubricant efficiently againstAl2O3 and (ZrO2-3mol% Y2O3)-39.6mass% Al2O3 substrates in the temperature range of roomtemperature to 1073K in air. In addition, thin SrSO4 films were observed on the wear scars formedon the Al2O3 and (ZrO2-3mol% Y2O3)-39.6mass% Al2O3 substrates
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1200.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fabrication of Functionally Porous Structures by the Sheet Lamination Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1711-1714 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Recent trends in bio technology have resulted in the need for accurate fabrication of porestructure of sophisticated porous materials used in advanced applications such as substrates for tissuegrowth, and various kinds of implants. Control of pore size is important for promoting growth ofblood vessels and adequate fluid flow. In the present study, an attempt has been made to fabricatefunctionally porous structures using titanium, including an internally controlled three-dimensional(3-D) fractal structure. A novel 3-D modeling method that combines rapid prototyping with sparkplasma sintering (SPS) is proposed, which enables us to control the internal porous structure.Titanium powder-tape or sheet is sintered or cut by a pulsed Nd:YAG laser to form 2-D fractalcross-sections. These 2-D layers are temporarily laminated in a carbon mold, being then jointed by theSPS method to maintain the internal porous structure. Process parameters for the sheet laminationmethod have extensively been investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1711.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Outflow of water from Funka Bay, Hokkaido, during early spring (1988)
    Springer
    Journal of oceanography 44 (1988), S. 163-170 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Observations were made to study the oceanographic structure of the dense water formation and its outflow from Funka Bay, Hokkaido, during early spring. The winter Funka Bay water, which was transformed from the warm water of the Tsugaru Current, due to cooling and deep convection during the winter, flowed from the bay, while forming a frontal structure. The width and inclination of the density front were about 3 n. miles and 1.4×10−2, respectively, during the early spring of 1982. These values roughly coincided with calculated values of 2.6 n. miles and 1.7×10−2 using the sill flow model proposed by Whiteheadet al. (1974). Observed current speeds and directions were also similar to those predicted by the model. The renewal time of bay water with this flow was estimated to be about 51 days, which is consistent with the results of previous studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02302640
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  • 9
    Electronic Resource
    Electronic Resource
    Irrotational, progressive surface gravity waves near the limiting height (1973)
    Springer
    Journal of oceanography 29 (1973), S. 94-105 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Numerical solutions of irrotational, progressive surface gravity waves in water of a constant depth are obtained by means of an iterative method. Our results suggest that waves with the surface slope angle greater thanπ/6 may exist. The calculated phase velocity of deep water waves near the wave steepness 0.14 is significantly smaller than the value given by the Stokes' fourth approximation. In order to check our method, we apply it to the problem proposed byDavies (1951), which is hypothetical but similar to the present problem, and for which the exact solution is known. In this case our results show good agreement with the exact solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109151
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  • 10
    Electronic Resource
    Electronic Resource
    Tissue- and developmental stage-specific expression of the rat ornithine carbamoyltransferase gene in transgenic mice (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Developmental Genetics 10 (1989), S. 393-401 
    Details
    ISSN: 0192-253X
    Keywords: Urea cycle enzyme ; Tissue-specific expression ; Developmental regulation ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Rat ornithine carbamoyltransferase (OCT; EC 2.1.3.3) is encoded by a large gene of 75 kilobases. Expression of this gene is restricted to the liver and small intestine, and there is an increase in expression late in gestation. The recombinant gene carrying 1.3 kilobases of the 5′ flanking region of the gene fused to the rat OCT cDNA was microinjected into fertilized eggs, and 17 transgenic mice were produced. Expression in the liver of the transgene was detected in three mice. In these mice, the transgene expression was observed exclusively in the liver and small intestine. Expression of the transgene in the intestine was comparable to that of the endogenous mouse OCT gene, whereas expression in the liver was much lower than that of the endogenous gene. The developmental pattern of expression of the transgene was similar to that of the endogenous gene. Therefore, the 5′ flanking sequence of the rat OCT gene seems to be sufficient for the developmental and tissue-specific expression of the gene. An explanation for low expression in the liver remains the subject of ongoing study.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/dvg.1020100507
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