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Numerical Simulations on Warm Forming of Stainless Steel with TRIP-Effect
Xiumei Wang,Chunhui Yang,Bernard Rolfe 한국소성가공학회 2010 기타자료 Vol.2010 No.6
In steels with TRIP-effect, a phase transformation from the retained-austenite to martensite occurs during forming, and it significantly affects hardening behaviours. Such an effect is sensitive to the amount of strain as well as the temperature variation. For materials with a strong TRIP-effect, new forming techniques are needed to develop that can lead to lighter and stronger components in automotive industry. This paper presents a coupled thermo-mechanical finite element modelling and simulation of a warm deep drawing of austenitic stainless steel (including a TRIP-effect) using LS-DYNA and temperature effect on forming process of such materials is investigated.
Research on green supply chain management pattern based on ISO14000 standards
Xiumei Sun,Min Zhou 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Green supply chain management is one of directions for the development of advanced manufacturing system today. The ISO14000 standards are the series standards of environmental management to promote environment protection and sustainable developing by ISO, which have stipulated an entire set of instruction enterprise establishment and the consummation environment management system, and provide the science way and the pattern for the modern enterprises. Therefore, based on system integration methods and current questions existing in implementing green supply chain management, the paper unifies ISO14000 standards with green supply chain management and formulates the total green supply chain management (TGSM) pattern which is from green design, green material, green manufacture, green marketing to the reversion flows. The paper shows that to carry out TGSM according to ISO14000 standards is significant for the modern enterprises to improve the environmental management level and core competency.
Xiumei Li,Chun Shen 대한수학회 2015 대한수학회보 Vol.52 No.6
This paper is mainly concerned with the formation of delta standing wave for the scalar conservation law with a linear flux function involving discontinuous coefficients by using the self-similar viscosity vanishing method. More precisely, we use the self-similar viscosity to smooth out the discontinuous coefficient such that the existence of approximate viscous solutions to the delta standing wave for the Riemann problem is established and then the convergence to the delta standing wave solution is also obtained when the viscosity parameter tends to zero. In addition, the Riemann problem is also solved with the standard method and the instability of Riemann solutions with respect to the specific small perturbation of initial data is pointed out in some particular situations.
Xiumei Zhang,Hiroo Tanaka 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
Results are shown on the preparation and characterization of homopolymer of 2-methacryloyloxyethyl isocyanate ( MOI) and copolymers of MOI with styrene synthesized by radical polymerization. The significant effectiveness of the polymers as additives for paper dry and wet strength was found. Dry strength can be increased by 75% and wet strength retention of sheets can reach 30% based on the increased dry strength and about 50% based on the dry strength of untreated sheet. Based on isocyanate group consumption, copolymers containing less isocyanate can give better effect than homopolymer in sheet wet strength improvement. Furthermore, the base paper containing a small amount of polyallylamine hydrochloride was used for polymer treatment and got higher wet strength improvement.
Output SNR Analysis of the LPP-Hough Transform
Xiumei Li,Guoqing Yang,Guangchun Gao 한국전자통신연구원 2013 ETRI Journal Vol.35 No.1
Recently, a new method called the local polynomial periodogram-Hough transform (LHT) was proposed for linear frequency modulated (LFM) signal detection. In this letter, a closed-form expression of the output signal-to-noise ratio is derived for the LHT, showing that the method exhibits a threshold effect for LFM signal detection. Comparisons with the pseudo-Wigner-Hough transform (PWHT) show that the threshold of the LHT is lower (better) than that of the PWHT.
AC092127.1-miR-451a-AE binding protein 2 Signaling Facilitates Malignant Properties of Breast Cancer
Xiumei Zhang,Lin Cong,Dafang Xu,Qi Leng,Ming Shi,Yonghua Zhou 한국유방암학회 2021 Journal of breast cancer Vol.24 No.4
Purpose: The purpose of the current study was to explore the functions and potential mechanism of miR-451a in breast cancer (BC). Methods: Quantitative reverse transcription real-time polymerase chain reaction was used to analyze the expression of miR-451a in human normal mammary cells (MCF-10A) and BC cells. Colony formation assay, terminal-deoxynucleoitidyl transferase mediated nick end labeling assay and transwell assays were conducted to validate the effect of miR-451a on proliferation, apoptosis, migration and invasion of BC cells, respectively. RNA pull-down, RNA immunoprecipitation and luciferase reporter assays were applied to investigate the upstream and downstream mechanisms of miR-451a in BC cells. Results: MiR-451a was expressed at a low level in BC cells. Overexpression of miR-451a repressed BC cells proliferation, migration and invasion. Moreover, long non-coding RNA AC092127.1 acted as a sponge of miR-451a to enhance the expression level of AE binding protein 2 (AEBP2) that was demonstrated to be the target gene of miR-451a in BC cells. Finally, rescue experiments validated that miR-451a and AEBP2 involved in AC092127.1-mediated BC cell growth, migration and invasion. Conclusion: In a word, AC092127.1/miR-451a/AEBP2 axis contributes to BC cell growth, migration and invasion. Our results may help to find novel potential targets for BC treatment.
Capturing Wetting States in Nanopatterned Silicon
Xu, XiuMei,Vereecke, Guy,Chen, Chang,Pourtois, Geoffrey,Armini, Silvia,Verellen, Niels,Tsai, Wei-Kang,Kim, Dong-Wook,Lee, Eunsongyi,Lin, Chang-You,Van Dorpe, Pol,Struyf, Herbert,Holsteyns, Frank,Moshc American Chemical Society 2014 ACS NANO Vol.8 No.1
<P>Spectacular progress in developing advanced Si circuits with reduced size, along the track of Moore’s law, has been relying on necessary developments in wet cleaning of nanopatterned Si wafers to provide contaminant free surfaces. The most efficient cleaning is achieved when complete wetting can be realized. In this work, ordered arrays of silicon nanopillars on a hitherto unexplored small scale have been used to study the wetting behavior on nanomodulated surfaces in a substantial range of surface treatments and geometrical parameters. With the use of optical reflectance measurements, the nanoscale water imbibition depths have been measured and the transition to the superhydrophobic Cassie–Baxter state has been accurately determined. For pillars of high aspect ratio (about 15), the transition occurs even when the surface is grafted with a hydrophilic functional group. We have found a striking consistent deviation between the contact angle measurements and the straightforward application of the classical wetting models. Molecular dynamics simulations show that these deviations can be attributed to the long overlooked atomic-scale surface perturbations that are introduced during the nanofabrication process. When the transition condition is approached, transient states of partial imbibition that characterize intermediate states between the Wenzel and Cassie–Baxter states are revealed in our experiments.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-1/nn405621w/production/images/medium/nn-2013-05621w_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn405621w'>ACS Electronic Supporting Info</A></P>