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Exploration of the Mesoscopic Failure Process of Granite Based on a PDE Method
Liming Zhang,Yu Cong,Shaoqiong Ma,Baocheng Feng 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.8
The meso-structure of rock influences its macro-mechanical properties. In traditional digital image processing, the filter operator causes fuzzy edges. There is a lack of image processing methods which can conveniently, and quickly, obtain a continuous, smooth, and closed curve with a clear boundary. In this study, a Chan-Vese (C-V) module of the partial differential equation (PDE) method was used to realise the three-phase segmentation of granite. Then, the AUTOLISP language was adopted to allow automatic line connection of the discrete boundary points in the digital image. The meso-scale model was implemented into numerical calculations to explore the evolution of a meso-crack. The crack originated from the stress concentration resulting from the uncoordinated deformation of the non-homogeneous materials under a Brazilian splitting test. The crack first appeared inside the materials with weak mechanical properties along the main diagonal of specimens under uniaxial compression. A stress concentration first appeared on the quartz-mica contact surface under triaxial compression. The tensile stress enveloped the weaker mica and feldspar as the load increased.
Reflections on the Three Waves of Women’s Studies in China and Globalization
Zhang, Liming Ewha Womans University Press 2010 Asian Journal of Women's Studies(AJWS) Vol.16 No.2
At the fourth United Nations World Conference on Women in Beijing in 1995, China was one of 49 countries that promised gender mainstreaming against a background of globalization. We can see clearly that since the mid 1980s, there has been a link between advancements in gender mainstreaming and the development of women’s studies in China. This paper focuses on the three waves of women’s studies in China, reflecting on the experiences of those working in women’s studies, identifying weaknesses in this field of study, and finally offering suggestions on how to improve the effectiveness of gender mainstreaming in both academia and government and to realize greater gender equality.
Sub-surface Damage of Ultra-Thin Monocrystalline Silicon Wafer Induced by Dry Polishing
Xundi Zhang,Chenlin Yang,Yumei Zhang,Anmin Hu,Ming Li,Liming Gao,Huiqin Ling,Tao Hang 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.4
Ultra-thin wafer fabrication has become a hot spot in recent years with the growing demand for small size and high performance electronic devices. However, far less research focused on the damage behavior in ultra-thin wafer. In this work, 300 mm diameter silicon wafer was thinned to 6 µm thick by grinding plus ultra-precision dry polishing. The damage behavior before and after the dry polishing was discussed. Mechanical and surface analysis showed that the dry polishing process can help improve the strength and surface uniformity of ultra-thin wafer by removing high pressure phase and micro cracks. Series of nano beam diffraction patterns revealed the stress induced by the thinning process only existed in surface. High resolution transmission electron microscopy images analyzed by geometric phase approach indicated that surface dislocations can move across the wafer and reached bottom device layers during the dry polishing, increasing the risk of electrical deterioration. The findings are of great significance to the study on process optimization of ultra-thin wafer and provide insights into the reliability of advanced electronic packaging.
Jincang Zhang,Shixun Cao,Ruiying Zhang,Liming Yu,Chao Jing 한국물리학회 2005 Current Applied Physics Vol.5 No.4
Polycrystalline nano-grain-boundary multi-doping ZnO-based nonlinear varistors with higher concentration additives have beenfabricated by solgel and standard solid-state reaction method, of which the best sample has a very high threshold voltage ofEb ¼ 3300 V/mm. The eect of sintering processes, sintering temperature and sintering time, and that of additive concentration ofBi2O3 on Eb of the samples are systematically investigated. The results show that the great merit of solgel method is its highthreshold voltage obtained by a lower sintering temperature than the solid-state reaction method. The present work also shows thatve phases including solid-state sintering, rich Bi liquid phase formation and ZnO as well as other additive dissolution, ZnO graingrowth, the secondary phase sucient formation and evolution have been experienced at dierent sintering temperatures. The holetype defect and nonhomogeneity of the microstructure will lead to the decrease of threshold voltage, i.e., the grain size and thehomogeneity of the material will be important factors and directly aect the characteristic of the varistor. The sintering charac-teristic and the inuence of Bi2O3 content on the threshold voltage are also discussed..
Yu, Liming,Tu, Qisheng,Han, Qianqian,Zhang, Lan,Sui, Lei,Zheng, Leilei,Meng, Shu,Tang, Yin,Xuan, Dongying,Zhang, Jin,Murray, Dana,Shen, Qingping,Cheng, Jessica,Kim, Sung-Hoon,Dong, Lily Q.,Valverde, P Wiley (John WileySons) 2015 Stem Cells Vol.33 No.1
<P>Adiponectin (APN) is an adipocyte-secreted adipokine that exerts well-characterized antidiabetic properties. Patients with type 2 diabetes (T2D) are characterized by reduced APN levels in circulation and impaired stem cell and progenitor cell mobilization from the bone marrow for tissue repair and remodeling. In this study, we found that APN regulates the mobilization and recruitment of bone marrow-derived mesenchymal stem cells (BMSCs) to participate in tissue repair and regeneration. APN facilitated BMSCs migrating from the bone marrow into the circulation to regenerate bone by regulating stromal cell-derived factor (SDF)-1 in a mouse bone defect model. More importantly, we found that systemic APN infusion ameliorated diabetic mobilopathy of BMSCs, lowered glucose concentration, and promoted bone regeneration in diet-induced obesity mice. In vitro studies allowed us to identify Smad1/5/8 as a novel signaling mediator of APN receptor (AdipoR)-1 in BMSCs and osteoblasts. APN stimulation of MC3T3-E1 osteoblastic cells led to Smad1/5/8 phosphorylation and nuclear localization and increased SDF1 mRNA expression. Although APN-mediated phosphorylation of Smad1/5/8 occurred independently from adaptor protein, phosphotyrosine interaction, pleckstrin homology domain, and leucine zipper containing 1, it correlated with the disassembly of protein kinase casein kinase 2 and AdipoR1 in immunoprecipitation experiments. Taken together, this study identified APN as a regulator of BMSCs migration in response to bone injury. Therefore, our findings suggest APN signaling could be a potential therapeutic target to improve bone regeneration and homeostasis, especially in obese and T2D patients.</P>
Wanshu Li,Yan Zhang,Qinghong Zheng,Kai Xu,Xiuyun Zhang,Liming Liu,Bin Wei,Lihui Wang,Jiwen Xu,Xiaowen Zhang 한국물리학회 2018 Current Applied Physics Vol.18 No.5
Solution-processed tungsten oxide (s-WOx) interfacial layer for efficient hole injection in fluorescent blue organic light-emitting diode (OLED) is demonstrated. The OLED using 2-methyl-9,10-bis(naphthalen-2- yl)anthracene (MADN) as emitter shows luminous efficiency of 3.3 cd/A, power efficiency of 2.5 lm/W and external quantum efficiency of 4.6% with Commission Internationale d'Eclairage (CIE) color coordinates of (0.154, 0.102). Using MADN doped 1-4-di-[4-(N,N-diphenyl)amino]styryl-benzene as emitter, luminous efficiency of 10.8 cd/A, power efficiency of 6.4 lm/W and external quantum efficiency of 7.2% with CIE color coordinates of (0.167, 0.283) are achieved. Atomic force microscopy and X-ray photoelectron spectroscopy show that s-WOx features superior film morphology and non-stoichiometry with slight oxygen deficiency. Current-voltage characteristics and impedance spectroscopy analysis indicate that s-WOx behaves slightly enhanced hole injection and accordingly contributes to improved device performance in comparison with conventional vacuum thermal evaporation WOx. Our results pave an alternative way for broadeningWOx application with solution process and advancing fluorescent blue OLEDs.
Business-Driven Process Fragment Selections in RESTful Business Processes
Qinghua Lu,Xiwei Xu,Weishan Zhang,Liming Zhu,Shanshan Li 보안공학연구지원센터(IJUNESST) 2015 International Journal of u- and e- Service, Scienc Vol.8 No.1
Past work showed that runtime adaptability of business processes can be improved by applying Representational State Transfer (REST) to design and implementation of business processes. However, the existing solutions for RESTful business processes (RESTfulBP) were focused on manual selection of process fragments to be composed at runtime. In this paper, we propose solutions that enable semi-automatic selection of process fragment at each decision-making point of RESTfulBP. The new built-in middleware MiniZnMASC can provide user based process fragment advice to knowledge workers in ways that achieve better overall business value while satisfying all existing constraints. In addition, we redesign the architecture of RESTfulBP in order to allow the business-driven decision-making solutions. The solutions are evaluated for feasibility, functional correctness, business benefits, and performance.