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Kinetic Model for the Phase Transformation of High‑Strength Steel Under Arbitrary Cooling Conditions
Hao Zhao,Xiuli Hu,Junjia Cui,Zhongwen Xing 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
To meet the demands of energy conservation and security improvement, high-strength steel (HSS) is widely used to producesafety-related automotive components. In addition to fully high-strength parts, HSS is also used to manufacture componentswith tailored properties. In this work, a computational model is presented to predict the austenite decomposition into ferrite,pearlite, bainite and martensite during arbitrary cooling paths in HSS. First, a kinetic model for both diffusional and martensitetransformations under isothermal or non-isothermal with constant cooling rate cooling conditions is proposed basedon the well-known Johnson–Mehl–Avrami–Kolmogorov and Kamamoto models. The model is then modified for arbitrarycooling conditions through the introduction of the effects of the cooling rate, and the influence of diffusional transformationson martensite transformation is considered. Next, the detailed kinetics parameters are identified by fitting experimental datafrom BR1500HS steel. The model is further verified by several experiments conducted outside of the fit domain. The resultsobtained by calculation are found to be in good agreement with the corresponding experimental data, including the transformationhistories, volume fraction microconstituents and Vickers hardness. Additionally, the model is also implementedas a subroutine in ABAQUS to simulate a tailored-strength hot stamping process of HSS, and the results are consistent withthe test data. Thus, this computational model can be used as a guideline to design manufacturing processes that achieve thedesired microstructure and material properties.
Two New Phenolic Compounds from the Fruiting Bodies of Ganoderma tropicum
Hu, Li-Li,Ma, Qing-Yun,Huang, Sheng-Zhuo,Guo, Zhi-Kai,Guo, Jian-Chun,Dai, Hao-Fu,Zhao, You-Xing Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.3
Chemical investigation of the fruiting bodies of Ganoderma tropicum led to the isolation of two new phenolic compounds, ganodermatropins A (1) and B (2). Their structures were elucidated by spectroscopic techniques (MS, 1D and 2D NMR). Ganodermatropin A exhibited antimicrobial activity against Staphylococcus aureus.
Oxygen removal from nitrogen using YBaCo_2O_(5+δ) adsorbent
Haoshan Hao,Bojun Chen,Limin Zhao,Xing Hu 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
The oxygen intake/release behavior of YBaCo_2O_(5+δ) and its application as a medium-temperature (100-600℃) adsorbent to oxygen removal in nitrogen purification was investigated. The oxygen content in YBaCo_2O_(5+δ)was varied between 5.46 and 5.0 with the change of the temperature and oxygen partial pressure. This oxygen nonstoichiometry showed good reversibility and the crystal structure of YBaCo_2O_(5+δ) remained stable in the oxygen intake/release process. Results of nitrogen purification experiment show that YBaCo_2O_(5+δ) material is a promising candidate to remove trace oxygen from nitrogen. After being deoxidized at 600 oC in nitrogen, 1 kg YBaCo_2O_(5+δ) adsorbent can purify 310 L nitrogen of 98.1% to high-purity nitrogen of over 99.9999% in one cycle.
NUMERICAL SIMULATION AND PREDICTION OF NEGATIVE STORM SURGE IN THE YANGTZE RIVER ESTUARY
Zeng Hao Qin,Yi Hong Duan,De Bao Hu,Mao Xing Gong 한국해안해양공학회 1999 학술강연회 발표논문초록집 Vol.1 No.1
An attempt is made by using both statistical model and multi-layer simplified ECOM-Si model with temperature and salinity effects neglected to investigate numerically the negative storm surge (SS) in the Yangtze River estuary. An operational system for predicting the negative SS are constructed in conjunction of ECOM-Si model with the operational limited-area fine-mesh numerical weather prediction (NWP) model developed by the Shanghai Typhoon Institute(STI).To test the reliability of ECOM-Si model and to understand the computational feature of the model in simulating sea surface elevation, both semi-diurnal tide computation at the river mouth tidal station and numerical SS simulations under the action of idealized easterly and westerly winds are completed. Based on these experiments, a series of negative SS simulations induced by the cold wave, tropical and extratropical cyclones are carried out respectively, in which the objective analysis data of atmospheric forcings on the sea surface are offered by STI NWP model. Case experiments show that the predicted peak negative SS are coincident with the real ones and the phase differences between them are within a acceptable limit. The system is hopeful in operational use for predicting negative SS in the Yangtze River estuary.
Staged Improvement in Awareness of Disease for Elderly Cancer Patients in Southern China
Li, Xing,Dong, Min,Wen, Jing-Yun,Wei, Li,Ma, Xiao-Kun,Xing, Yan-Fang,Deng, Yun,Chen, Zhan-Hong,Chen, Jie,Ruan, Dan-Yun,Lin, Ze-Xiao,Wang, Tian-Tian,Wu, Dong-Hao,Liu, Xu,Hu, Hai-Tao,Lin, Jia-Yu,Li, Zhu Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15
Background: In mainland China, awareness of disease of elderly cancer patients largely relies on the patients' families. We developed a staged procedure to improve their awareness of disease. Materials and Methods: Participants were 224 elderly cancer patients from 9 leading hospitals across Southern China. A questionnaire was given to the oncologists in charge of each patient to evaluate the interaction between family and patients, patient awareness of their disease and participation in medical decision-making. After first cycles of treatment, increased information of disease was given to patients with cooperation of the family. Then patient awareness of their disease and participation in medical decision-making was documented. Results: Among the 224 cancer elderly patients, 26 (11.6%) made decisions by themselves and 125 (55.8%) delegated their rights of decision-making to their family. Subordinate family members tended to play a passive role in decision-making significantly. Patients participating more in medical decision-making tended to know more about their disease. However, in contrast to the awareness of disease, patient awareness of violation of medical recommendations was reversely associated with their participation in medical decision-making. Improvement in awareness of diagnosis, stages and prognosis was achieved in about 20% elderly cancer patients. About 5% participated more actively in medical decision-making. Conclusions: Chinese elderly cancer patient awareness of disease and participation in medical decision-making is limited and relies on their family status. The staged procedure we developed to improve patient awareness of disease proved effective.
Two New Phenolic Compounds from the Fruiting Bodies of Ganoderma tropicum
Li-Li Hu,Qing-Yun Ma,Sheng-Zhuo Huang,Zhi-Kai Guo,Jianchun Guo,Hao Fu Dai,You-Xing Zhao 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.3
Chemical investigation of the fruiting bodies of Ganoderma tropicum led to the isolation of two new phenolic compounds, ganodermatropins A (1) and B (2). Their structures were elucidated by spectroscopic techniques (MS, 1D and 2D NMR). Ganodermatropin A exhibited antimicrobial activity against Staphylococcus aureus.
Sanrong Li,Jing Ma,Caiying Hu,Xing Zhang,Deyong Xiao,Lili Hao,Wenjun Xiao,Jichun Yang,Ling Hu,Xiaowei Liu,Minghui Dong,Duan Ma,Rensheng Liu 한국유방암학회 2018 Journal of breast cancer Vol.21 No.3
In this study, we used next-generation sequencing methods to screen 300 individuals for BRCA1 and BRCA2. A novel mutation (c.849dupT) in BRCA2 was identified in a female patient and her unaffected brothers. This mutation leads to the truncation of BRCA2 functional domains. Moreover, BRCA2 mRNA expression levels in mutation carriers are significantly reduced compared to noncarriers. Immunofluorescence and western blot assays showed that this mutation resulted in reduced BRCA2 protein expression. Thus, we identified a novel mutation that damaged the function and expression of BRCA2 in a family with breast cancer history. The pedigree analysis suggested that this mutation is strongly associated with familial breast cancer. Genetic counsellors suggest that mutation carriers in this family undergo routine screening for breast cancer, as well as other malignancies, such as prostate and ovarian cancer. The effects of this BRCA2 mutation on drug resistance should be taken into consideration during treatment.
Yue Li,Jing-Ying Zhang,Xin-Yue Zhao,Li-Ya Pan,De-Hao Jin,He-Xing Xu,Hu-Zhe Cui,Yan-Qun Liu,Xiang-Zheng Qin,Qingyuan Li 대한정형외과학회 2021 Clinics in Orthopedic Surgery Vol.13 No.2
Background: The accessory tendon of the extensor hallucis longus (ATEHL) muscle is a common abnormal structure, and its clinical significance remains debatable. In this study, we provide the incidence of the ATEHL and characterize its morphological types in Asian cadavers and investigate its clinical applications. Methods: The tendons from 50 adult cadaveric feet, fixed in 10% formalin, were analyzed. We measured the length and width of both the ATEHL and the extensor hallucis brevis (EHB). Results: All dissected specimens had an ATEHL. The first metatarsophalangeal joint was surrounded by an accessory tendon that inserted onto the joint capsule and the dorsal base of the proximal phalanx. We classified the ATEHL into 3 types based on their directions. Differences in ATEHL type based on sex were not statistically significant. Conclusions: We found an ATEHL in all cadaveric specimens in this study. We surmise that the ATEHL acts as an antagonist with the EHB when the toe is extending, which might help prevent the occurrence of hallux valgus deformity.