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The Influence of Roll Speed on the Rolling of Metal Plates
Wang, B .,Kong, L . X .,Hu, W .,Hodgson, P . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
A FEM simulation study was carried out to investigate the influence of the roll speed on the rolling process. Using a commercial FEM code, ABAQUS, a number of cases were studied. The angular velocity of the rigid rolls ranged from 30 to 480 revolutions per minute (r.p.m.) and the initial feeding speed of the plate was kept constant, thus causing a slipping between the plate and the roll surfaces. The results indicate that for an elastic-plastic hardening plate under the same thickness reduction, a higher rotating speed of rolls will help to reduce the roll separating force and the maximum value of the residual stress in the plate. Though this is a purely numerical simulation and more studies are required to look at the thermo-mechanical and frictional aspects, it does pose to be an inspiration for more tests to be carried out.
Correlation between Carbon Steel Corrosion and Atmospheric Factors in Taiwan
( C. M. Lo ),( L. H. Tsai ),( C. W. Hu ),( M. D. Lin ) 한국부식방식학회(구 한국부식학회) 2018 Corrosion Science and Technology Vol.17 No.2
Taiwan has a typical marine climate featuring perennial high-temperature and dampness. This climate, together with the emission of various industrial corrosive waste gases in recent years, contributes a lot to the corrosion of metal materials. In this study, samples of carbon steel exposed to various atmospheres in Taiwan were analyzed to investigate the impacts of atmospheric factors on carbon steel corrosion. Carbon steel samples were collected from 87 experimental stations between 2009 and 2012. Statistical analysis was employed to investigate the correlations between the carbon steel corrosion situations and the atmospheric factors such as concentrations of sulfur dioxide or chloride, exposure time, rainfall, etc. The results indicate that for samples from industrial areas, the sulfur dioxide concentration and exposure time during fall and winter are significantly correlated to the condition of the carbon steel corrosion. However, for samples from coastal zones, the significant correlated factors are chloride concentration and wetting time during winter. The results of this study are useful for the development of carbon steel corrosion prediction models.
DISCOVERY OF AN X-RAY-EMITTING CONTACT BINARY SYSTEM 2MASS J11201034−2201340
Hu, Chin-Ping,Yang, Ting-Chang,Chou, Yi,Liu, L.,Qian, S.-B.,Hui, C. Y.,Kong, Albert K. H.,Lin, L. C. C.,Tam, P. H. T.,Li, K. L.,Ngeow, Chow-Choong,Chen, W. P.,Ip, Wing-Huen American Astronomical Society 2016 The Astronomical journal Vol.151 No.6
<P>We report the detection of orbital modulation, a model solution, and the X-ray properties of a newly discovered contact binary, Two Micron All Sky Survey (2MASS) J11201034-2201340. We serendipitously found this X-ray point source outside the error ellipse when searching for possible X-ray counterparts of 7-ray millisecond pulsars among the unidentified objects detected by the Fermi Gamma-ray Space Telescope. The optical counterpart of the X-ray source (unrelated to the 7-ray source) was then identified using archival databases. The long-term Catalina Real-Time Transient Survey detected a precise signal with a period of P = 0.28876208 (56) days. A follow-up observation made by the Super Light Telescope of Lulin Observatory revealed the binary nature of the object. Utilizing archived photometric data of multi-band surveys, we construct the spectral energy distribution (SED), which is well fit by a K2V spectral template. The fitting result of the orbital profile using the Wilson Devinney code suggests that 2MASS J11201034-2201340 is a short-period A-type contact binary and the more massive component has a cool spot. The X-ray emission was first noted in observations made by Swift, and then further confirmed and characterized by an XMM-Newton observation. The X-ray spectrum can be described by a power law or thermal Bremsstrahlung. Unfortunately, we could not observe significant X-ray orbital modulation. Finally, according to the SED, this system is estimated to be 690 pc from Earth with a calculated X-ray intensity of (0.7 - 1.5) x 10(30) erg s(-1), which is in the expected range of an X-ray emitting contact binary.</P>
Ma, R. C. W.,Hu, C.,Tam, C. H.,Zhang, R.,Kwan, P.,Leung, T. F.,Thomas, G. N.,Go, M. J.,Hara, K.,Sim, X.,Ho, J. S. K.,Wang, C.,Li, H.,Lu, L.,Wang, Y.,Li, J. W.,Wang, Y.,Lam, V. K. L.,Wang, J.,Yu, W.,Ki Springer-Verlag 2013 Diabetologia Vol.56 No.6
<P><B>Aims/hypothesis</B></P><P>Most genetic variants identified for type 2 diabetes have been discovered in European populations. We performed genome-wide association studies (GWAS) in a Chinese population with the aim of identifying novel variants for type 2 diabetes in Asians.</P><P><B>Methods</B></P><P>We performed a meta-analysis of three GWAS comprising 684 patients with type 2 diabetes and 955 controls of Southern Han Chinese descent. We followed up the top signals in two independent Southern Han Chinese cohorts (totalling 10,383 cases and 6,974 controls), and performed in silico replication in multiple populations.</P><P><B>Results</B></P><P>We identified <I>CDKN2A/B</I> and four novel type 2 diabetes association signals with <I>p</I> < 1 × 10<SUP>−5</SUP> from the meta-analysis. Thirteen variants within these four loci were followed up in two independent Chinese cohorts, and rs10229583 at 7q32 was found to be associated with type 2 diabetes in a combined analysis of 11,067 cases and 7,929 controls (<I>p</I><SUB>meta</SUB> = 2.6 × 10<SUP>−8</SUP>; OR [95% CI] 1.18 [1.11, 1.25]). In silico replication revealed consistent associations across multiethnic groups, including five East Asian populations (<I>p</I><SUB>meta</SUB> = 2.3 × 10<SUP>−10</SUP>) and a population of European descent (<I>p</I> = 8.6 × 10<SUP>−3</SUP>). The rs10229583 risk variant was associated with elevated fasting plasma glucose, impaired beta cell function in controls, and an earlier age at diagnosis for the cases. The novel variant lies within an islet-selective cluster of open regulatory elements. There was significant heterogeneity of effect between Han Chinese and individuals of European descent, Malaysians and Indians.</P><P><B>Conclusions/interpretation</B></P><P>Our study identifies rs10229583 near <I>PAX4</I> as a novel locus for type 2 diabetes in Chinese and other populations and provides new insights into the pathogenesis of type 2 diabetes.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1007/s00125-013-2874-4) contains peer-reviewed but unedited supplementary material, which is available to authorised users.</P>