Characteristics of Copper-Clad Aluminum Rods Prepared by Horizontal Continuous Casting

Yubo Zhang,Ying Fu,Jinchuan Jie,Li Wu,Kateryna Svynarenko,Qingtao Guo,Tingju Li,Tongmin Wang 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6

An innovative horizontal continuous casting method was developed and successfully used to prepare copper-cladaluminum (CCA) rods with a diameter of 85 mm and a sheath thickness of 16 mm. The solidification structure andelement distribution near the interface of the CCA ingots were investigated by means of a scanning electron microscope,an energy dispersive spectrometer, and an electron probe X-ray microanalyzer. The results showed that theproposed process can lead to a good metallurgical bond between Cu and Al. The interface between Cu and Al wasa multilayered structure with a thickness of 200 μm, consisting of Cu9Al4, CuAl2, α-Al/CuAl2 eutectic, and α-Al +α-Al/CuAl2 eutectic layers from the Cu side to the Al side. The mean tensile-shear strength of the CCA sample was45 MPa, which fulfills the requirements for the further extrusion process. The bonding and diffusion mechanismsare also discussed in this paper.

Epidemiology, Characteristics, and Prognostic Factors of Primary Atypical Teratoid/Rhabdoid Tumors in the Spinal Canal: A Systematic Review

Zhibin Li,Yubo Wang,Liyan Zhao,Yunqian Li 대한척추신경외과학회 2024 Neurospine Vol.21 No.1

Primary atypical teratoid/rhabdoid tumors (AT/RTs) in the spinal canal are rare central nervous system (CNS) neoplasms that are challenging to diagnose and treat. To date, there has been no standard treatment regimen for these challenging malignant tumors. Thus, we conducted this research to explore potential prognostic factors and feasible treatment modalities for improving the prognosis of these tumors. Articles were retrieved from the PubMed, MEDLINE, and Embase databases, using the keywords “atypical teratoid/rhabdoid tumor,” “rhabdoid tumor,” “spine,” “spinal,” “spinal neoplasm”, and “spinal cord neoplasm.” All eligible cases demonstrated SMARCB1-deficient expression validated by pathological examination. We collected and analyzed data related to clinical presentation, radiological features, pathological characteristics, treatment modalities and prognosis via Kaplan-Meier and Cox regression analyses. Thirty-six articles comprising 58 spinal AT/RT patients were included in the study. The median progression-free survival (PFS) and overall survival (OS) were 18 and 22 months, respectively. Kaplan-Meier analysis demonstrated significant survival improvements for OS in the nonmetastasis, male, radiotherapy and intrathecal chemotherapy groups as well as for PFS in the chemotherapy and radiotherapy groups. Multivariate analysis revealed that chemotherapy and radiotherapy were prognostic factors for improved PFS, and that intrathecal chemotherapy reduced the risk of mortality. Spinal AT/RTs are uncommon malignant entities with a dismal survival rate. Although our review is limited by variability between cases, there is some evidence revealing potential risk factors and the importance of systematic chemotherapy, intrathecal chemotherapy and radiotherapy in spinal AT/RT treatment modalities.

Light-Chain Cardiac Amyloidosis: Cardiac Magnetic Resonance for Assessing Response to Chemotherapy

Guo Yubo,Li Xiao,Gao Yajuan,Shen Kaini,Lin Lu,Wang Jian,Cao Jian,Zhang Zhuoli,Wan Ke,Zhou Xi Yang,Chen Yucheng,Zhang Long Jiang,Li Jian,Wang Yining 대한영상의학회 2024 Korean Journal of Radiology Vol.25 No.5

Objective: Cardiac magnetic resonance (CMR) is a diagnostic tool that provides precise and reproducible information about cardiac structure, function, and tissue characterization, aiding in the monitoring of chemotherapy response in patients with lightchain cardiac amyloidosis (AL-CA). This study aimed to evaluate the feasibility of CMR in monitoring responses to chemotherapy in patients with AL-CA. Materials and Methods: In this prospective study, we enrolled 111 patients with AL-CA (50.5% male; median age, 54 [interquartile range, 49–63] years). Patients underwent longitudinal monitoring using biomarkers and CMR imaging. At followup after chemotherapy, patients were categorized into superior and inferior response groups based on their hematological and cardiac laboratory responses to chemotherapy. Changes in CMR findings across therapies and differences between response groups were analyzed. Results: Following chemotherapy (before vs. after), there were significant increases in myocardial T2 (43.6 ± 3.5 ms vs. 44.6 ± 4.1 ms; P = 0.008), recovery in right ventricular (RV) longitudinal strain (median of -9.6% vs. -11.7%; P = 0.031), and decrease in RV extracellular volume fraction (ECV) (median of 53.9% vs. 51.6%; P = 0.048). These changes were more pronounced in the superior-response group. Patients with superior cardiac laboratory response showed significantly greater reductions in RV ECV (-2.9% [interquartile range, -8.7%–1.1%] vs. 1.7% [-5.5%–7.1%]; P = 0.017) and left ventricular ECV (-2.0% [-6.0%–1.3%] vs. 2.0% [-3.0%–5.0%]; P = 0.01) compared with those with inferior response. Conclusion: Cardiac amyloid deposition can regress following chemotherapy in patients with AL-CA, particularly showing more prominent regression, possibly earlier, in the RV. CMR emerges as an effective tool for monitoring associated tissue characteristics and ventricular functional recovery in patients with AL-CA undergoing chemotherapy, thereby supporting its utility in treatment response assessment.

Text Steganography Based on Ci-poetry Generation Using Markov Chain Model

나유박 ( Yubo Luo ),황영봉 ( Yongfeng Huang ),이복방 ( Fufang Li ),장진성 ( Chinchen Chang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.9

Steganography based on text generation has become a hot research topic in recent years. However, current text-generation methods which generate texts of normal style have either semantic or syntactic flaws. Note that texts of special genre, such as poem, have much simpler language model, less grammar rules, and lower demand for naturalness. Motivated by this observation, in this paper, we propose a text steganography that utilizes Markov chain model to generate Ci-poetry, a classic Chinese poem style. Since all Ci poems have fixed tone patterns, the generation process is to select proper words based on a chosen tone pattern. Markov chain model can obtain a state transfer matrix which simulates the language model of Ci-poetry by learning from a given corpus. To begin with an initial word, we can hide secret message when we use the state transfer matrix to choose a next word, and iterating until the end of the whole Ci poem. Extensive experiments are conducted and both machine and human evaluation results show that our method can generate Ci-poetry with higher naturalness than former researches and achieve competitive embedding rate.

Properties of Aspergillar Xylanase and the Effects of Xylanase Supplementation in Wheat-based Diets on Growth Performance and the Blood Biochemical Values in Broilers

Wu, Yubo,Lai, Changhua,Qiao, Shiyan,Gong, Limin,Lu, Wenqing,Li, Defa Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.1

Three experiments were conducted to study the property of xylanase and the effects of xylanase in wheat-based diets on growth performance of broilers, respectively. Experiment 1 was performed in vitro to evaluate the effect of different pH and temperature on xylanase activity, and to evaluate the enzymic stability under different conditions. The results indicated that the optimum temperature and pH for xylanase activity were $50^{\circ}C$ and 4.5, respectively. The activity of enzyme solution was reduced rapidly after the treatment of water bath above $60^{\circ}C$ for 10 min. The enzyme was relatively stable at pH 3.5 to 8.0 and deteriorated when incubated at pH below 3.5. In Experiment 2, a total of 378 d-old male Arbor Acres broilers were randomly distributed to 7 different treatments with 6 replicates (9 birds) in each treatment. The treatments were as follows: (1) corn based diet (CS), (2) wheat based diet (WS), (3) WS+ 0.05% xylanase, (4) WS+0.15% xylanase, (5) WS+0.25% xylanase, (6) WS+0.35% xylanase, (7) WS+0.45% xylanase. The results showed that the body weight and feed/gain ratio of the broilers fed wheat-based diets have been significantly improved (p<0.05) compared to that fed corn-based diet in the first 3 wk. With regard to the wheat-based diets, the xylanase supplementation had a tendency to improve the growth performance in first 3 wk. After 3 wk, no significant difference (p>0.05) was found among all these different treatments. The supplementation of xylanase and the type of diets did not affect the feed intake but increased the concentration of triglyceride in serum. In Experiment 3, a total of 360 d-old male Arbor Acres broilers were assigned to 30 groups with 12 birds in each group randomly. These groups were then randomly distributed to 5 different treatments with 6 replicates within each treatment. The broilers of each treatment were fed one of the diets as follows: (1) Corn based diet, (2) White wheat based diet (WW) (3) White wheat based diet+0.25% xylanase, (4) Red wheat based diet, (5) Red wheat based diet+0.25% xylanase. The results showed that the body weight and feed/gain ratio had been significantly improved (p<0.05) by xylanase supplementation in the first 2 or 3 wk. The effect of xylanase in red wheat diet is a little higher than that used in white wheat diet. From the results of the present experiments, it can be concluded that the supplementation of Aspergillar xylanase can improve the performance of the broilers fed the wheat-based diet.

Study of Milling GH3039 on Milling Force with Ceramic Tool WG300

Jinghe Li,Wang Xi,Min Qi,Yubo Liu 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.5

To nickel base superalloy in dry cutting, the milling experiment be done in the four-axis machining center with ceramic tool WG300 is in order to know the influence of cutting speed to chip morphology through the macroscopic observation on chip by optical microscope and the analysis of chip morphology. Then, focus on the machining features of GH3039, reasonable orthogonal test be designed, after which getting the influence of different level’s value to milling force and its change law based on the range analysis of experiment datum.

Phase transformation and roasting kinetics of cobalt-rich copper sulfide ore in oxygen atmosphere assisted by sodium sulfate

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.

Application of YOLOv5 Neural Network Based on Improved Attention Mechanism in Recognition of Thangka Image Defects

( Yao Fan ),( Yubo Li ),( Yingnan Shi ),( Shuaishuai Wang ) 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.1

In response to problems such as insufficient extraction information, low detection accuracy, and frequent misdetection in the field of Thangka image defects, this paper proposes a YOLOv5 prediction algorithm fused with the attention mechanism. Firstly, the Backbone network is used for feature extraction, and the attention mechanism is fused to represent different features, so that the network can fully extract the texture and semantic features of the defect area. The extracted features are then weighted and fused, so as to reduce the loss of information. Next, the weighted fused features are transferred to the Neck network, the semantic features and texture features of different layers are fused by FPN, and the defect target is located more accurately by PAN. In the detection network, the CIOU loss function is used to replace the GIOU loss function to locate the image defect area quickly and accurately, generate the bounding box, and predict the defect category. The results show that compared with the original network, YOLOv5-SE and YOLOv5-CBAMachieve an improvement of 8.95% and 12.87% in detection accuracy respectively. The improved networks can identify the location and category of defects more accurately, and greatly improve the accuracy of defect detection of Thangka images.

Structure and Refinement Performance of Al-5Ti-0.2C Master Alloy Produced via an Improved Self Propagating Synthesis Approach

Kateryna Svynarenko,Yubo Zhang,Jinchuan Jie,Valentyna Kutsova,Tingju Li 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.4

When Al-Ti-C master alloys are produced via the conventional Self-propagating High-temperature Synthesis(SHS), the reduction of production temperature below 1523 K leads to the drastic deterioration of the refiner efficacy. In the present work, a simple yet effective way to improve the combustion process for low TiC-containingrefiners is proposed. The SHS reaction was performed to obtain Al-10TiC slurry first, which subsequently wasmixed with Al-Ti melt to obtain Al-5Ti-0.2C master alloy. By means of the proposed method, the process temperaturewas lowered to 1323 K. According to the results, in the case of improved SHS approach, the Al temperatureafter the onset of reaction increases by 90-100 K more than in the case of conventional preparation route,providing better kinetic conditions for TiC formation. As a result, at 1323 K production temperature, the averagecarbide size increases by 100% as compared to the conventionally produced refiner, which is claimed to be a reasonfor the improved refining performance of master alloy.

Microstructure and Refinement Performance of Al-Ti-C Master Alloy: Effect of Excess Ti on the Growth and Nucleating Ability of TiC Particles

Kateryna Svynarenko,Yubo Zhang,Jinchuan Jie,Valentyna Kutsova,Tingju Li 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5

Al-5Ti-0.2C, Al-0.8Ti-0.2C, Al-8Ti-2C, and Al-10Ti master alloys were prepared and used to investigate theinfluence of excess Ti on the growth of TiC particles and its ability to nucleate Al-grains. The results of a microstructureanalysis of TiC-containing alloys and refined CPAl were interrelated to the results of a refinement test. Itwas found that the presence of excess Ti is essential at the stage of master alloy preparation, as it facilitates thegrowth and uniform distribution of TiC within the structure. In Al-5Ti-0.2C alloy containing excess Ti, carbideparticles grow faster and to a higher extent (from 0.29 μm to 0.44 μm) compared to Al-0.8Ti-0.2C alloy producedwithout excess Ti (from 0.29 μm to 0.32 μm). The results support the “Ti-transition zone theory” as the mechanismof grain refinement by TiC-containing master alloys. The refinement performance of Al-5Ti-0.2C is superiorcompared to the one achieved by adding Al-8Ti-2C and Al-10Ti master alloys in corresponding concentrations. For the TiC particles to become favourable nucleating sites, they must undergo certain interaction with excess Ti atthe stage of master alloy preparation.