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ZiBo Tang,Wei Xiong,Jin Zhang,Ying Zheng,Cheng Huang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
Stiffened cylindric components made by traditional block-welding processes are severely limited by their poor mechanicalproperties. Here, we present a novel spin-extrusion forming (SEF) process for manufacturing 2195 Al–Li alloy weld-freestiffened components. The grain configuration of 2195 Al–Li alloy was first tuned by different annealing temperaturesand subsequently modified by SEF and T8 treatments. The evolution of microstructure and mechanical properties of thestiffened cylindric component is studied in detail. The results show that the initial grain structure with large proportion ofrecrystallized grains are transformed into fine equiaxed grains after SEF, and the hardness is increased. After T8 treatment,the sample with higher proportion of deformed grains have the highest peak-aging hardness and the shortest peak-aging timedue to grain boundary strengthening. However, T1phases are enriched at the grain boundaries after T8 treatment, resultingin precipitation-free zones and thus lowering the strength and elongation of the samples. In clear contrast, the samples consistlargely of recrystallized grains achieves the highest tensile strength (602.1 MPa) and elongation (7%), simultaneouslyimproving the strength and ductility of the spin-extruded 2195 stiffened cylindric component.
Medical Diagnosis Algorithm Based on Tongue Image on Mobile Device
Zhou, Zibo,Peng, Dongliang,Gao, Fumeng,Leng, Lu Korea Multimedia Society 2019 The journal of multimedia information system Vol.6 No.2
In traditional Chinese medical (TCM) science, tongue images can be observed for medical diagnosis; however, the tongue diagnosis of TCM is influenced by the subjective factors of doctors, and the diagnosis results vary from person to person. Quantitative TCM tongue diagnosis can improve the accuracy of diagnosis and increase the application value. In this paper, digital image processing and pattern recognition technologies are employed on mobile device to classify tongue images collected in different health states. First, through grayscale integral projection processing, the trough is found to localize the tongue body. Then the tongue body image is transferred from RGB color space to HSV color space, and the average H and S values are considered as the color features. Finally, the diagnosis results are obtained according to the relationship between the color characteristics and physical symptoms.
Visibility Measurement in an Atmospheric Environment Simulation Chamber
Hongda Ta,Zibo Zhuang,Lihui Jiang,Dongsong Sun 한국광학회 2017 Current Optics and Photonics Vol.1 No.3
Obtaining accurate visibility measurements is a common atmospheric optical problem, and of vitalsignificance to civil aviation. To effectively evaluate and improve the accuracy of visibility measurements,an outdoor atmospheric simulation chamber with dimensions of 1.8×1.6×55.7 m3was constructed. Thesimulation chamber could provide a relatively homogeneous haze environment, in which the visibility variedfrom 10 km to 0.2 km over 5 hours. A baseline-changing visibility measurement system was constructedin the chamber. A mobile platform (receiver) was moved from 5 m to 45 m, stopping every 5 m, tomeasure and record the transmittance. The total least-squares method was used to fit the extinctioncoefficient. During the experiment conducted in the chamber, the unit weight variance was as low as1.33×10-4under high-visibility conditions, and the coefficient of determination (R2) was as high as 0.99under low-visibility conditions, indicating high stability and accuracy of the system used to measure theextinction coefficients and strong consistency between repeated measurements. A Grimm portable aerosolspectrometer (PAS) was used to record the aerosol distribution, and then Mie theory was used to calculatethe extinction coefficients. The theoretical results were found to be consistent with the measurements andexhibited a positive correlation, although they were higher than the measured values.
Zhao Jingjing,Liu Shuai,Li Zibo,Ma Wenhe,Shao Yang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
With the frequent occurrence of extreme weather, the resilience of distribution system (DS) has become a hot research topic in recent years. In this article, a novel resilience improvement approach is proposed, the multi-stage restoration process is taken into account to enhance the resilience of DS, and the active islanding and separable mobile energy storage systembased service restoration are comprehensively taken into account to enhance the resilience of DS. The multi-stage restoration process is modeled in detail, consisting of the topology and operational constraints of each stage, and they are multi infuenced each other. The model is formulated as a mixed-integer linear programming problem. Case studies on the IEEE 33-bus system prove that the proposed method can improve the resilience of the DS efectively
Menghao Luo,Hange Feng,Yuechuan Hu,Keke Chen,Zibo Dong,Shaolin Xue 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.1
Photocatalytic degradation has received considerable emphasis since it shows signifi cant possibilities in environmentalpollution. In this work, ternary Z-scheme heterojunction g-C 3 N 4 /TiO 2 /Ti 3 C 2 photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C 3 N 4 and TiO 2 dramatically modify the photocatalyticperformances of the compound under illumination. Meanwhile, in this process, multilayer Ti 3 C 2 , as the transport mediumof Z-scheme heterojunction, is tightly bonded to TiO 2 generated by hydrothermal oxidation and g-C 3 N 4 with large specifi csurface area, which eff ectively facilitates the space charge separation and depresses the charge recombination. When theaddition amount of TiO 2 /Ti 3 C 2 is 80 mg and calcined at 450 ℃ for 4 h, g-C 3 N 4 /TiO 2 /Ti 3 C 2 has the greatest photocatalyticperformance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C 3 N 4 and 14.55times that of Ti 3 C 2 , respectively. This work illustrates that g-C 3 N 4 /TiO 2 /Ti 3 C 2 has outstanding potential and off ers novelinsights for designing and synthesizing new ternary heterojunction materials.
Accurate computational design of multipass transmembrane proteins
Lu, Peilong,Min, Duyoung,DiMaio, Frank,Wei, Kathy Y.,Vahey, Michael D.,Boyken, Scott E.,Chen, Zibo,Fallas, Jorge A.,Ueda, George,Sheffler, William,Mulligan, Vikram Khipple,Xu, Wenqing,Bowie, James U. American Association for the Advancement of Scienc 2018 Science Vol.359 No.6379
<P><B>Membrane protein oligomers by design</B></P><P>In recent years, soluble protein design has achieved successes such as artificial enzymes and large protein cages. Membrane proteins present a considerable design challenge, but here too there have been advances, including the design of a zinc-transporting tetramer. Lu <I>et al.</I> report the design of stable transmembrane monomers, homodimers, trimers, and tetramers with up to eight membrane-spanning regions in an oligomer. The designed proteins adopted the target oligomerization state and localized to the predicted cellular membranes, and crystal structures of the designed dimer and tetramer reflected the design models.</P><P><I>Science</I>, this issue p. 1042</P><P>The computational design of transmembrane proteins with more than one membrane-spanning region remains a major challenge. We report the design of transmembrane monomers, homodimers, trimers, and tetramers with 76 to 215 residue subunits containing two to four membrane-spanning regions and up to 860 total residues that adopt the target oligomerization state in detergent solution. The designed proteins localize to the plasma membrane in bacteria and in mammalian cells, and magnetic tweezer unfolding experiments in the membrane indicate that they are very stable. Crystal structures of the designed dimer and tetramer—a rocket-shaped structure with a wide cytoplasmic base that funnels into eight transmembrane helices—are very close to the design models. Our results pave the way for the design of multispan membrane proteins with new functions.</P>