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Surface Quality Controlling Research on High Speed Milling Nickel-Based Superalloy Inconel 718
Yubo Liu,Xu Yanfeng,Xi Wang,Wang Xufeng 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.7
Nickel based superalloy Inconel 718 is difficult to machine as a material. The prediction model of surface roughness in high speed milling of Nickel-based Superalloy Inconel 718 was developed based on multiple regression analysis. The model is established from the experiments conducted on a XH714D matching center. The predicted results by using this model agree very well with those obtained from experiments, and the Prediction model of surface roughness of nickel based superalloy can provide a foundation to optimize cutting parameters and control surface quality.
Research on the Wear Mechanism of Ceramic Tool in Turning of Nickel-based Superalloy GH4169
Yubo Liu,Yongde Zhang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
The dry cutting experiment for nickel-based high temperature alloyGH4169 was conducted with Al2O3- SiCw whisker toughening ceramic blade WG300 and Si3N4-Al2O3 ceramics (Sialon) blade SX9. The main wear mechanism of ceramic cutting tools were analyzed by means of observing the wear morphology about cutting tools with scanning electron microscope, and measuring concentration of each element in wear tiny region lying in the ceramic tools with Energy Dispersive Spectrometer(EDS). The results show that the main wear mechanism of ceramic cutting tool was presented by cohesive wear, abrasive wear and oxidation wear. Cohesive wear occurs mainly on the rake face and were influenced by the contact stress state between the contact points of cutting tool and workpiece material.
반복가력 실험을 통한 ST-Modular 내진보강공법의 내진성능평가
유해양 ( Liu Hai-yang ),왕우박 ( Wang Yubo ),이강석 ( Lee Kang-seok ) 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.26 No.2
본 연구에서는 철근콘크리트(RC) 건물의 내진성능을 향상시키기 위하여 충전강관 모듈러(Steel Tube-Modular, 이하 ST-Modular) 내진보강법을 제안하였다. ST-Modular 내진보강공법의 내진성능을 평가하기 위하여 반복가력실험을 수행하였다. 제안 내진보강 공법의 내진성능평가를 위해 무보강 실험체(전단기둥 1체, 필로티기둥 1체)와 제안 ST-Modular로 보강된 실험체(전단기둥 1체, 필로티기둥 1체)를 반복가력 실험을 통해 보강 전·후의 내진성능을 비교분석하였다.
Bilibili: Soaring to be China's largest Video Community for Young People
Ting Liu,Yubo Zhou,Huili Chen,Hao Sun,Rocky P. Chen Academy of Asian Business (AAB) 2023 Academy of Asian Business Review Vol.9 No.1
Bilibili, the most popular software in China among young people, deserves further exploration. This report aims to analyze how Bilibili has grown from a small website full of pirate videos to a preferred video community for China's younger generation (under 35 years old) today through community atmosphere building, content ecology maintenance, and understanding the mindset of Generation Z+ (born from 1985 to 2009). There are four main segments in this report. The timeline shows the major events that have shaped Bilibili since its foundation. Second, this report analyzes its four important turning points. Moreover, the success factors exhibit what makes Bilibili stand out from the many short-form video platforms in China. For example, Bilibili grasped the psychology of young people, managed to attract young people, and came out with its differentiation strategy. Finally, this report summarizes the lessons that students and entrepreneurs can learn from Bilibili's success.
Xiang Li,Yubo Liu,Weijiao Yang,Baozhong Ma,Yongqiang Chen,Chengyan Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The recovery rates of copper (99 %) and cobalt (93 %) could be significantly increased by adding sodiumsulfate in activated roasting of Cobalt-rich copper sulfide (CRCS). The mechanism and kinetic parametersof CRCS roasting with sodium sulfate addition were not clear. Thus, in this study, the thermal roastingkinetics of carrollite (the predominant cobalt occurrence mineral) in CRCS adding Na2SO4 with an airatmosphere was studied in detail by TG-DTG method. The apparent activation energy (E) and preexponentialfactor (A) were obtained via Flynn-Wall-Ozawa method (FWO) and Kissinger-Akahira-Sunose method (KAS) methods, where E values were 113.89 kJmol1 (KAS) and 120.87 kJmol1(FWO). The thermodynamic parameters of the roasting process were evaluated. The model function forthe carrollite reaction was determined via Malek analysis. The mechanism of sodium sulfate additionin CRCS roasting was studied. Results showed that the addition of sodium sulfate in activated roastingcan promote the transformation of carrollite mineral phase. The activation energy value of the oxidationprocess of carrollite decreases. From the kinetic point of view, the addition of sodium sulfate can promotethe activation roasting.
Huidong Zhou,Yubo Liu,Baozhong Ma,Chengyan Wang,Yongqiang Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
As a critical resource, lithium is necessary for the flourishing of clean energy as an upstream raw material. With the global popularity of lithium batteries and strict requirements for environmental protection, ashort, cost-effective lithium extraction process from a-spodumene was critical. In this paper, a novel processfor efficient and direct extraction of lithium from a-spodumene was proposed. The main contents ofthe process were sodium roasting, water quenching and strengthening leaching. Firstly, the thermodynamicbehavior of the roasting products was analyzed using Factsage 7.0 software. Subsequently, the factorsof lithium extraction were investigated by single-factor condition experiments. And the responsesurface methodology (RSM) was used to carry out the three-factor and three-level Box-Behnken experiments. The investigation revealed that a-spodumene reacted directly with Na2CO3 at high temperature toform Li2SiO3, NaAlSiO4, and Na2SiO3. The stable aluminosilicate structure in a-spodumene was destroyedby the combined effect of sodium roasting and water quenching, which played a significant role in therelease of lithium. In addition, the Na2CO3 dosage dominated the effect of lithium extraction, followedby roasting temperature and roasting time. Based on the model optimization results, the optimal roastingconditions were determined to be roasting at 1100 C for 30 min with the addition of 45% Na2CO3. Theextraction rates of Li and Rb were 95.9% and 90.3%, respectively, whereas those of Al was only 1.5%. This process provides a technological solution for the high-efficiency and synergistic extraction of valuableelements in a-spodumene.
Xueyi Zheng,Yini Huang,Yubo Liu,Yun Wang,Rushuang Mao,Fei Li,Longhui Cao,Jianhua Zhou 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.2
Objective: To determine the added value of a shear-wave elastography (SWE) quality map (QM) in the diagnosis of breast lesions and in predicting the biological characteristics of invasive breast cancer. Materials and Methods: Between January 2016 and February 2019, this study included 368 women with 368 pathologically proven breast lesions, which appeared as poor-quality regions in the QM of SWE. To measure shear-wave velocity (SWV), seven regions of interest were placed in each lesion with and without QM guidance. Under QM guidance, poor-quality areas were avoided. Diagnostic performance was calculated for mean SWV (SWVmean), max SWV (SWVmax), and standard deviation (SD) with QM guidance (SWVmean + QM, SWVmax + QM, and SD + QM, respectively) and without QM guidance (SWVmean - QM, SWVmax - QM, and SD - QM, respectively). For invasive cancers, the relationship between SWV findings and biological characteristics was investigated with and without QM guidance. Results: Of the 368 women (mean age, 47 years; SD, 10.8 years) enrolled, 159 had benign breast lesions and 209 had malignant breast lesions. SWVmean + QM (3.6 ± 1.39 m/s) and SD + QM (1.02 ± 0.84) were significantly different from SWVmean - QM (3.29 ± 1.22 m/s) and SD - QM (1.46 ± 1.06), respectively (all p < 0.001). For differential diagnosis of breast lesions, the sensitivity and areas under the receiver operating characteristic curve (AUC) of SWVmean + QM (sensitivity: 89%; AUC: 0.932) were better than those of SWVmean - QM (sensitivity, 84.2%; AUC, 0.912) (all p < 0.05). There was no significant difference in sensitivity and specificity between SD + QM and SD - QM (all p = 1.000). Among the biological characteristics of invasive cancers, lymphovascular involvement, axillary lymph node metastasis, negative estrogen receptor status, negative progesterone receptor status, positive human epidermal growth factor receptor status, and aggressive molecular subtypes showed higher SWVmean + QM (all p < 0.05), while only lymphovascular involvement showed higher SWVmean - QM (p = 0.036). Conclusion: The use of QM in SWE might improve the diagnostic performance for breast lesions and facilitate prediction of the biological characteristics of invasive breast cancers.
Zhao Can,Tao GuangFu,Liu Yubo,Guo Yanyan 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8
To analyze the influence caused by different cutting parameters on the cutting force and get the coefficient of milling force obtained under the state of high-speed milling, the high-speed milling test was conducted through carbide cutting tools milling the titanium impeller under the state of high speed. Firstly, the influence on the three target force, caused by every parameter, was analyzed through orthogonal experiment. And then, the milling force coefficient got from two different formula was compared in this article. Calculated and experimental results show that the milling force coefficient got by means of the empirical formula reduced flutter stability limit, however, he milling force coefficient got by means of parsing not. At last, it also provide data to support to avoid the chatter occurred between tool and workpiece and select the processing parameters optimally.
The Study of Tool Wear About Ceramic Cutting Tool Processing Mechanism of Super-alloy
Zhao Can,Tao GuangFu,Liu Yubo,Guo Yanyan,Zhang Yanhui 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.5
Separately using two different types of ceramic cutting tool, through the experiments of ceramic cutting tool to study the processing of super-alloy of tool wear, compare the two processing the cutting tool wear condition, and further analysis of the wear mechanism of ceramic cutting tool process, and get the related conclusion.