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1

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Evidence that homologous X-chromosome pairing requires transcription and Ctcf protein (2007)

Xu, Na ; Donohoe, Mary E ; Silva, Susana S ; [et al.]

[s.l.] : Nature Publishing Group

Nature genetics 39 (2007), S. 1390-1396

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ISSN: 1546-1718

Source: Nature Archives 1869 - 2009

Topics: Biology , Medicine

Notes: [Auszug] X-chromosome inactivation (XCI) ensures the equality of X-chromosome dosages in male and female mammals by silencing one X in the female. To achieve the mutually exclusive designation of active X (Xa) and inactive X (Xi), the process necessitates that two Xs communicate in trans through homologous ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/ng.2007.5

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SUMOylation of Tr2 orphan receptor involves Pml and fine-tunes Oct4 expression in stem cells (2007)

Park, Sung Wook ; Hu, Xinli ; Gupta, Pawan ; [et al.]

[s.l.] : Nature Publishing Group

Nature structural & molecular biology 14 (2007), S. 68-75

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ISSN: 1545-9985

Source: Nature Archives 1869 - 2009

Topics: Biology , Medicine

Notes: [Auszug] The Tr2 orphan nuclear receptor can be SUMOylated, resulting in the replacement of coregulators recruited to the regulatory region of its endogenous target gene, Oct4. UnSUMOylated Tr2 activates Oct4, enhancing embryonal carcinoma-cell proliferation, and is localized to the promyelocytic leukemia ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/nsmb1185

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Synthesis of a Novel Hollow Sphere Having Rigid Binaphthyl Macrocycle as Shell (2007)

Liu, Na ; Wang, Xing ; Cao, Hui ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Solid state phenomena Vol. 121-123 (Mar. 2007), p. 219-222

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ISSN: 1662-9779

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Physics

Notes: A novel hollow sphere having rigid binaphthyl macrocycle as shell was prepared by meansof sacrifice the silica core. The synthesis of hollow sphere from rigid colloidal silica particles occursin three steps: a) modification of silica particles with vinyltriethoxysilane as coupling agent, b)immersion in the solution of monomer having rigid binaphthyl macrocycle and polymerization, and c)removal of silica particles. These macrocycles contained in the shell of hollow spheres belong to animportant class of host-guest macrocyclic material in which the rigid backbone and C2 symmetry ofthe binaphthyl unit play an important role in complexing guest molecules. This will endow hollowsphere with new opportunities in molecular recognition and separation.The morphology of colloidalsilica particles and hollow spheres was characterized by SEM and TEM

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.219.pdf

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Dependency of Electrical Characteristics on Au Nano-Crystal Size for Non-Volatile Memory Fabricated with Au Nano-Crystal Embedded in PVK(Poly(N-Vinylcarbazole)) Layer (2007)

Lee, Chang Kyu ; Kwon, Jong Sung ; Na, In Chul ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Solid state phenomena Vol. 124-126 (June 2007), p. 33-36

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ISSN: 1662-9779

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Physics

Notes: We demonstrated a nonvolatile memory fabricated with the sandwich device structure ofAl/Au nano-crystals embedded in the PVK/Al. The bi-stable conduction switching characteristic(Ion/Ioff ratio) was 〉1x102, depending on Au nano-crystal size. The size and distribution of Aunano-crystals were determined by the inserted Au-layer thickness between PVK layers. The size ofAu nano-crystals increased with the inserted Au-layer thickness. The uniform distribution of isolatedAu nano-crystals was obtained with 5 nm of the inserted Au-layer thickness

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.33.pdf

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5

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A Study on Corrosion-Resistant Properties of Unleaded Bi-Containing Automotive Epoxy Primers (2007)

Yang, Won Seog ; Ahn, Seung Ho ; Kim, Jung Gu ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Solid state phenomena Vol. 124-126 (June 2007), p. 1537-1540

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ISSN: 1662-9779

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Physics

Notes: The aim of this work is to evaluate the difference in the corrosion resistance betweenunleaded containing bismuth automotive epoxy primers and leaded one. It was also discussed theeffect of zinc phosphate pretreatment. The specimen coated unleaded epoxy primer showed 0.5Vhigher corrosion potential than that of bare steel. The result of salt spray test did not indicateremarkable difference of corrosion resistance in all specimens above 10 [removed info] thickness up to 1200hours. In the cyclic corrosion test, unleaded epoxy primers on phosphated substrate performedgood corrosion properties until 800 hours. The lead free primer performed the equivalentcorrosion resistance as leaded coating on phosphated steel, but slightly inferior to that of leadedon bare steel. These results show that the pre-treatment of zinc phosphating is effective as well aspigment changing in performing anti-corrosion properties in automotive bodies

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1537.pdf

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6

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Dimensional Characteristics of Products Using Rotary Swaging Machine with Four-Dies (2007)

Lim, Seong Joo ; Choi, Ho Joon ; Na, Kyoung Hoan ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Solid state phenomena Vol. 124-126 (June 2007), p. 1645-1648

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ISSN: 1662-9779

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Physics

Notes: Experiments under a cold rotary swaging process have been conducted to investigate thedimensional characteristics of the swaged tube and solid bar for obtaining proper product of desirablequality. Dimensional characteristics are expressed in terms of dimensional deviation and surfaceroughness of swaged product through the rotary swaging process. The process variables such asforming speed and percent reduction of outer diameter of the product are considered and selectedbecause of playing a key role in the rotary swaging process. Furthermore the developed rotaryswaging machine with four-split dies, named as KRSM25, is used in the swaged experiment. Basedon the experimental results, it is observed that the process variables affect the quality of swagedproduct such as dimensional precision, surface roughness of the product. Defect could be found tooccur at a value of more than 2.0 mm/rev in forming speed. The dimensional precision of swagedproduct depends on the percentage reduction of outer diameter and forming speed. The workpresented in this paper might be used for available information in the design of the optimum rotaryswaging process

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1645.pdf

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Effect of Deep Cryogenic Treatment on Carbide Precipitation and Mechanical Properties of Tool Steel (2006)

Rhyim, Young Mok ; Han, Sang Ho ; Na, Young Sang ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Solid state phenomena Vol. 118 (Dec. 2006), p. 9-14

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ISSN: 1662-9779

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Physics

Notes: It is well known that the durability of tool steel could be improved by deep cryogenictreatment. It has been assumed that the increase of service life of tool steel caused by decrease ofretained austenite and/or by formation of nano-scale fine η-carbide. But the principles of deepcryogenic treatment remain unclear yet. In this research, to manifest the effect of deep cryogenictreatment on wear resistance, the specimen was emerged in liquid nitrogen for 20 hours for deepcryogenic treatment after austenitizing and the following tempering temperature was varied. Themicrostructure of specimens was observed using TEM and the mechanical properties and wearresistance were examined. As the tempering temperature increased, the carbides became larger andfine carbides were formed above certain temperature. In the case of deep cryogenic treatedspecimen, the number of carbides increased while the carbides size was decreased, furthermore, thefine carbide forming temperature was lowered also. It was considered that the deep cryogenictreatment increased the driving force for the nucleation of carbides. As tempering temperatureincreased, hardness decreased while wear resistance and impact energy increased. The deepcryogenic treated specimens showed this tendency more clearly. It was considered that the wearresistance is affected not only to the hardness but also to the precipitation of fine carbides, and thiscarbide evolution can be optimized through the deep cryogenic treatment

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.9.pdf

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An Investigation of the Melt-Out and Heat Checking Phenomena in Surface Modified Hot Die Steel for Aluminum Die Casting (2006)

Youn, Kuk Tae ; Rhyim, Young Mok ; Lee, Jong Hoon ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Solid state phenomena Vol. 118 (Dec. 2006), p. 443-450

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ISSN: 1662-9779

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Physics

Notes: For hot die steel, failure is mostly caused by heat checking and melt-out on its surfaceswhich are in contact with molten metals. In the present research, resistances to melt-out and heatchecking of surface modified H13 hot die steels, such as gas nitriding(GN) andmicro-blasting(MB), were investigated. The evaluation of melt-out behavior was carried out bymeasuring the mean depth from the original surface after immersion. To examine the thermalfatigue resistance, a cyclic thermal shock system consisting of induction heating and water sprayquenching was constructed. The value of Lm is proposed as the index representing the susceptibilityto crack initiation and propagation. The melt-out depth was the lowest for the GN treated surface.MB-GN and MB-GN-MB treated specimens also showed good resistance to melt-out. In the case ofGN treatment, while the white layer was completely melted out, the diffusion layer still existedeven after immersion for 43 hours. This implies that nitriding significantly reduced the rate ofmelt-out. From the total crack number, it is seen that crack initiation was reduced to the extent ofhalf after surface treatment. This result means that the residual compressive stress and nitrided layerwere beneficial to crack initiation resistance

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.443.pdf

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Effect of Surface Condition on Melt-Out of Die-Casting Mould (2006)

Youn, Kuk Tae ; Na, Young Sang ; Lee, Jong Hoon ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Solid state phenomena Vol. 118 (Dec. 2006), p. 509-514

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ISSN: 1662-9779

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Physics

Notes: In order to understand the melt-out mechanism of H13 die casting mould material,microstructural investigation was conducted for the immersion-tested surface in Al-alloy melt. Thesurface condition of H13 tool steel was modified by varying nitriding conditions and by surfaceblasting. In particular, long-term behavior of melt-out phenomena during immersion testing of up to43 hours was focused in this article. It was observed that an ion-nitrided H13 surface showed higherresistance towards melt-out than a gas-nitrided or blasted surface. This was related to the surfacelayers that are normally formed by nitriding

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.509.pdf

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Studies on Multi Morphology of Polyaniline Guided by Alkali (2007)

Wang, Xing ; Liu, Na ; Zhang, Wan Jin

s.l. ; Stafa-Zurich, Switzerland

Solid state phenomena Vol. 121-123 (Mar. 2007), p. 429-432

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ISSN: 1662-9779

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Physics

Notes: Multi morphology of polyaniline (PANI), nanotubes, micrograins, solid and hollowspheres, were synthesized by aqueous oxidative polymerization of aniline in the presence of sodiumhydroxide (NaOH), which was proposed as an alkali-guided method by the authors. By changing themolar ratio of aniline monomer to alkali, with a constant pH, the morphology can be controlled fromnanotubes to micrograins, to solid spheres and to hollow spheres which were proved by SEM andTEM. The backbone structure was characterized by UV-VIS, FTIR and XRD

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.429.pdf

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