http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kubí,k, Petr,Š,ebek, Františ,ek,Petruš,ka, Jindř,ich,Hů,lka, Jiř,í,Park, Namsu,Huh, Hoon Elsevier 2018 Theoretical and applied fracture mechanics Vol.98 No.-
<P><B>Abstract</B></P> <P>This paper deals with a small punch test and ductile failure prediction of austenitic stainless steel 316L. Comprehensive investigation of fracture surfaces was conducted as well as examination of δ-ferrite and σ-phase present in the material in order to reveal the reason of occurrence of nonstandard type of fracture. Three phenomenological ductile fracture criteria were selected for comparative simulations regarding the prediction of crack initiation and propagation during the SPT. These criteria were calibrated by using the fracture tests of smooth cylindrical specimens, notched cylindrical specimens, notched tube specimens and cylinders with spherical recess. The whole material model including the fracture criteria with von Mises plasticity and element deletion technique for simulation of the crack initiation was implemented by using the user subroutine Vectorised User MATerial into the commercial finite element code of Abaqus. Finally, the simulation results with three ductile fracture criteria are compared and discussed based on the experimental results. Only one of the failure criteria captured the displacement at fracture correctly.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Wide range of stress states is experimentally described for AISI 316L. </LI> <LI> Detailed study of fracture surfaces produced by penetration tests. </LI> <LI> Non-standard cracking is observed due to ferrite phase. </LI> <LI> Uncoupled ductile fracture criteria are calibrated for austenitic stainless steel. </LI> </UL> </P>
Inverse modeling analysis of soil dust sources over East Asia
Ku, B.,Park, R.J. Pergamon Press ; Elsevier [distribution] 2011 Atmospheric environment Vol.45 No.32
Soil dust is the dominant aerosol by mass concentration in the troposphere and has considerable effects on air quality and climate. Parts of East Asia, including southern Mongolia, northern China, and the Taklamakan Desert, are important dust source regions. Accurate simulations of dust storm events are crucial for protecting human health and assessing the climatic impacts of dust events. However, even state-of-the-art aerosol models still contain large uncertainties in soil dust simulations, particularly for the dust emissions over East Asia. In this study, we attempted to reduce these uncertainties by using an inverse modeling technique to simulate dust emissions. We used the measured mass concentration of particles less than 10 μm in aerodynamic diameter (PM<SUB>10</SUB>) in the surface air over East Asia, in combination with an inverse model, to understand the dust sources. The global three-dimensional GEOS-Chem chemical transport model (CTM) was used as a forward model. The inverse model analysis yielded a 76% decrease in dust emissions from the southern region of the Gobi Desert, relative to the a priori result. The a posteriori dust emissions from the Taklamakan Desert and deserts in eastern and Inner Mongolia were two to three fold higher than the a priori dust emissions. The simulation results with the a posteriori dust sources showed much better agreement with these observations, indicating that the inverse modeling technique can be useful for estimation of the optimized dust emissions from individually sourced regions.
Synthesis and characterization of thermoresponsive polymeric nanoparticles
Ku, B.,Seo, H. I.,Chung, B. G. Korean BioChip Society 2014 BioChip Journal Vol.8 No.1
We synthesized drug-loaded thermoresponsive poly(N-isopropylacrylamide) with acrylic acid (poly(NIPAM-co-AA)) nanoparticles. Dynamic light scattering analysis showed that the size of poly (NIPAM-co-AA) nanoparticles was significantly affected by temperatures, indicating that the sizes were changed from 400 nm at 25 degrees C to 100 nm at 37 degrees C. H-1 nuclear magnetic resonance (NMR) and fourier transform infrared spectroscopy (FT-IR) analysis demonstrated the synthesis of poly(NIPAM-co-AA) nanoparticles, showing that drugs (e.g., doxorubicin, retinoic acid) were conjugated with poly(NIPAM-co-AA) nanoparticles. We also analyzed the cumulative release of drugs in a temporal manner, indicating that doxorubicin was highly released from poly(NIPAM-co-AA) nanoparticles at 48 hours compared to retinoic acid. Therefore, this thermoresponsive drug-loaded poly (NIPAM-co-AA) nanoparticle could be a powerful tool for drug delivery and release applications.
Olga Zhukova,Sergey Dydykin,Eliska Kubíková,Natalia Markova,Yuriy Vasil’ev,Marina Kapitonova 대한성형외과학회 2022 Archives of Plastic Surgery Vol.49 No.3
Background In recent years thread lift has become widespread; however, existing methods need to improve their long-term outcome, which requires considering topographic anatomy of face and neck, especially the ligamentous apparatus. This study aims to assess the effectiveness and safety of an innovative method of one-time three-step thread facelift, which provides an additional support to the ligamentous structures of the upper, middle, and lower thirds of the face and neck. Methods The study included 357 patients aged 32 to 67 years with various morphotypes of aging. The original method of thread lift was applied, and its effectiveness was followed up for to 2 years. The Wrinkle Severity Rating Score (WSRS) and Global Aesthetic Improvement Scale (GAIS) scores were used for assessment by investigators, independent observers, and patients. Statistical significance was determined using paired t-test and chi-square test. Results The meanWSRS score was 3.880.88 before the thread lift, 1.930.81 one month after the procedure, and 2.360.85 after 2 years of follow-up. The mean GAIS was 4.800.04 one month after thread lift, and 4.010.04 after 2 years, while in the patients’ assessment Global Satisfaction Scale was 4.860.02 and 4.100.02, respectively. There were no clinically significant complications throughout the observation period. Conclusion The new method of one-time three-step thread fixation of the soft tissues of the face and neck demonstrated a high degree of satisfaction by both experts and patients after 2 years of follow-up. It showed high efficacy and safety, including in the group of patients with pronounced age-related changes of the skin of face and neck.
Application of the Law of Self-Determination in a Postcolonial Context: A Guideline
M. Ya’kub Aiyub Kadir (사) 이준국제법연구원 2016 Journal of East Asia and International Law Vol.9 No.1
The development of the law of self-determination has been stagnant in terms of scope and content in its application in the postcolonial context. It requires a new paradigm to persuade the United Nations, its specialized agencies and affiliated organizations to address current phenomenon regarding normative, institutional and community awareness. This research has revealed that the essential meaning of self-determination is a remedial means for an oppressed person both in colonial and postcolonial context. While the colonial context has ended, postcolonial self-determination remains focussed on both repairing the historical wrongs of the colonial context, responding to the breakdown of a state, and recovering from persistent violations against anyone in the State. Accordingly, this paper will contribute to the development of guidelines for these applications: which primarily refer to some degree of internal self-determination (autonomy); and when this proves unsuccessful, external self-determination (independent) can be proposed as the last resort.
Rechargeable zinc oxide / carbon nano-structures
M. A. Mastro,M. J. Tadjer,F. J. Kub,K. D. Hobart,C. R. Eddy, Jr,김지현,M.R. Papantonakis 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1
A simple solution growth process was employed to deposit ZnO nanowires on carbon nanotubes and nano-structured carbon paper. Vertical ZnO nanowires formed on the carbon paper with a hexagonal orientation. On the carbon nanotubes, the ZnO nanowires and platelets integrated as an agglomerated sphere. Electric charge flow was measured in both structures upon probe contact, and would decay over several hours. A mechanical perturbation was found to recharge the structure, which was attributed to the piezoelectric ZnO nanowires. Continuous as well as intermittent vibration coupled with an electrochemical storage mechanism to create a perpetual current source.
Luminescence characteristics of zinc oxide nanocrystals deposited on glass via a solution method
Mastro, M.A.,Freitas, J.A.,Eddy, C.R.,Kub, F.,Ahn, J.,Kim, H.Y.,Kim, J. North-Holland 2009 Physica E, Low-dimensional systems & nanostructure Vol.41 No.3
A simple solution growth process was employed to deposit ZnO nanowires on glass slides. The batch process was scaled from one to multiple glass slides with no apparent scaling limit observed. Strong green emission, distinctive of the ZnO surface luminescence, was measured and visualized in individual nanowires. This technique can be used to grow high-quality ZnO nanowires on any substrate.