Improved the hydrogen sorption properties of MgH2 by CeMnZr solid solution

Ying Cheng,Wei Zhang,Biqing Shi,Siqi Li,Bing Dong,Yulian Quan,Xianbin Ji 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.1

Magnesium hydride (MgH2) is one of the promising solid-state hydrogen storage materials because of its high capacity, abundant resource and excellent reversibility. However, the high dehydrogenation temperatures and sluggish kinetics restrict its practical application. It was found that doping catalysts could significantly improve the hydrogen storage properties of MgH2. The solid solution Ce0.8Mn0.1Zr0.1O2 (denoted as CeMnZr) with abundant oxygen vacancy was synthesized and its catalytic influence on the hydrogen sorption properties of MgH2 have been investigated. CeMnZr modified MgH2 composite showed a reduced initial decomposition temperature, almost 62 K lower than the pristine MgH2. At 473 K, MgH2-CeMnZr composite had an absorption capacity of 4.08 wt% hydrogen within 3,500 s, which was about twice better than the pure MgH2 at same condition. MgH2-CeMnZr sample could desorb 2.56 wt% of H2 within 3,500 s at 573 K compared to low desorption rate and 0.85 wt% H2 by as-milled MgH2. The activation energy (Ea) for CeMnZr codoped MgH2 sample is about 50kJ·mol−1 lower than the milled MgH2. Based on the characteration analysis, the in-situ generated MgO and CeH2.51 species as well as abundant oxygen vacancy is believed to play synergistic catalytic effects in enhancing the hydrogen storage properties of MgH2.

Application of a Neural Network-based Visual Question Answering System in Preschool Language Education

Ying Cheng 대한전자공학회 2023 IEIE Transactions on Smart Processing & Computing Vol.12 No.5

The continuous progress of modern science and technology has led to comprehensive innovations in education, and the use of information technology for teaching has become the mainstream in the current education field. For children’s preschool language education, the application of a visual question answering (VQA) system has gradually become a new development power. This research uses a Recurrent Neural Network and a VGGNet-16 network to extract features from text and images, respectively, and applies a Hierarchical Joint Attention (HJA) model to the whole VQA system. Experiment results demonstrate that the HJA model reaches the target accuracy after 125 iterations, and convergence performance is good. When using the VQAv1 dataset, accuracy can stabilize at 88% after 18 iterations, and when using the VQAv2 dataset, the highest and lowest overall accuracy rates are 77% and 72%, respectively. The three question types (Num, Y/N, and Other) are answered with high accuracy when using the chosen preschool language education database for children, providing accuracy rates of 90%, 94%, and 91%, respectively. This new reference technique offers a new method for maximization of a VQA system, and significantly raises the preschool language education level of the children.

Correctly Understanding Li理in 朱熹and 李退溪:理發氣生、氣發理生 What is 奇明彥's Challenge to 朱熹and 李退溪 in the “Four-Seven”Debates?

Chung‐ying Cheng 영남퇴계학연구원 2009 퇴계학논집 Vol.5 No.-

The geography of intercity technological proximity: evidence from China

Yingcheng Li,Weiting Xiong,Xiaowu Hu 서울시립대학교 도시과학연구원 2023 도시과학국제저널 Vol.27 No.3

In the context of a globalizing knowledge economy, cities have become more technologically proximate due to the increasing exchanges of people, information, and knowledge. However, technological proximity at the city level has gained relatively little attention within the vast literature on proximity. Drawing upon detailed address information on nearly 3.6 million invention patents that were applied in China between 2012 and 2016, this paper investigates the geography of intercity technological proximity among 286 Chinese cities. Technological proximity is measured by comparing cities’ technological profiles which are represented by the distribution of different classifications of patenting activity in which cities specialize. The empirical results show that the level of intercity technological proximity among Chinese cities has been generally on the rise. Moreover, there is strong spatial political bias in the geography of intercity technological proximity, with geographical proximity and institutional proximity having played a significantly positive role in facilitating intercity technological proximity.

An Improved Variable Neighborhood Search Algorithm for Multi Depot Heterogeneous Vehicle Routing Problem based on Hybrid Operators

Yingcheng Xu,Wei Jiang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.3

The changing spatialities of China’s knowledge economy: introduction to the special issue

Yingcheng Li 서울시립대학교 도시과학연구원 2023 도시과학국제저널 Vol.27 No.3

This paper introduces the special issue on The Changing Spatialities of The Knowledge Economy in China in the International Journal of Urban Sciences in 2023. It begins with the introduction of the motivation of this special issue, arguing that it is both timely and necessary to analyse the changing spatialities of the knowledge economy in China where knowledge economy and innovation-driven development have gained growing attention in recent years. It then provides a critical review on innovation networks at different geographical scales and the rise of urban innovation space, which are conceived as two important perspectives to understand the changing spatialities of China’s knowledge economy. The main contents and contributions of the six papers in this special issue are then briefly discussed, which is followed by a short conclusion.

Third places as catalysts for technological innovation? Evidence from a grid cell level analysis of Nanjing, China*

Jingang Li,Yingcheng Li,Manya Tu,Xingjian Liu 서울시립대학교 도시과학연구원 2024 도시과학국제저널 Vol.28 No.1

While third places have often been conceived as key drivers for technological innovation, further empirical modelling is necessary to verify such relationship. Drawing upon a database on geocoded patents and third places in Nanjing, China, this paper investigates their relationship at a grid cell level. The results suggest that both quantity and diversity of third places could be associated with the process of technological innovation. Furthermore, the study finds an inverted U-curve relationship between the quantity of third places and technological innovation, indicating that too many third places may not be linked with higher technological innovation capacity. It also suggests that the number of business incubators may weaken the relationship between third places and technological innovation.

Customized maxillary incisor position relative to dentoskeletal and soft tissue patterns in Chinese women: A retrospective study

Zhou Xueman,Zheng Yingcheng,Zhang Zhenzhen,Zhang Zihan,Wu Lina,Liu Jiaqi,Yang Wenke,Wang Jun 대한치과교정학회 2022 대한치과교정학회지 Vol.52 No.2

Objective: To provide reliable prediction models based on dentoskeletal and soft tissue variables for customizing maxillary incisor positions and to optimize digitalized orthodontic treatment planning. Methods: This study included 244 Chinese women (age, 18–40 years old) with esthetic profiles after orthodontic treatment with fixed appliances (133 in group I: 1° ≤ The angle between the nasion [N]-A point [A] plane and the N-B point [B] plane [ANB] ≤ 4°; 111 in group II: 4° < ANB ≤ 7°). Dental, skeletal, and soft tissue measurements were performed on lateral cephalograms of the participants. Correlation and multiple linear regression analyses were used to determine the influence of dentoskeletal and soft tissue variables on maxillary incisor position. Results: The ideal anteroposterior position of the maxillary incisor varied between sagittal skeletal patterns. The position of the maxillary incisor correlated with the sagittal discrepancy between the maxilla and the mandible (ANB), protrusion of the midface, nasal tip projection, development of the chin, and inclination of both the maxillary and mandibular incisors. Distance from the maxillary central incisor to nasion-pogonion plane predicted using multiple linear regression analysis was accurate and could be a practical measurement in orthodontic treatment planning. Conclusions: Instead of using an average value or norm, orthodontists should customize a patient’s ideal maxillary incisor position using dentoskeletal and soft tissue evaluations.

Extraction of Cellulose Nanofibrils with Ultraviolet Blocking from Agro-industrial Wastes: A Comparative Study

Xin Zhao,Fangchao Cheng,Yingcheng Hu 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1

Cellulose nanofibrils (CNFs) were successfully isolated from agro-industrial waste (cornstalk, corn flesh, andcorncob) by subjecting the raw materials to organosolv and peroxide treatment, followed by ultrasonication. A detailedcomparative study was performed. Characterization results showed that the CNFs from cornstalk (CS) exhibited higher yieldand lignin content (20.81 %), compared with CNFs from corn flesh (CF) and corncob (CC). The CNFs from CF and CCexhibited similar morphology, particle size, crystallinity, and thermal stability but showed improved ultraviolet blockingability and optical transparency relative to those of CS. The CNFs from CF showed higher dispersion stability andmechanical properties than those from CS and CC. Peroxide treatment negatively influenced crystallinity and thermalstability, but exerted no apparent effect on optical transparency and mechanical strength. Thus, this study demonstrates thatagro-industrial wastes are sustainable resources for CNF production, which can potentially have a wide range of value-addedapplications. Ionic liquid-aided solvothermal treatment followed by ultrasonication is a facile and ideal method to produceCNFs with ultraviolet blocking ability.

Dose-Dense Rituximab-CHOP versus Standard Rituximab-CHOP in Newly Diagnosed Chinese Patients with Diffuse Large B-Cell Lymphoma: A Randomized, Multicenter, Open-Label Phase 3 Trial

Xueying Li,He Huang,Bing Xu,Hongqiang Guo,Yingcheng Lin,Sheng Ye,Jiqun Yi,Wenyu Li,Xiangyuan Wu,Wei Wang,Hongyu Zhang,Derong Xie,Jiewen Peng,Yabing Cao,Xingxiang Pu,Chengcheng Guo,Huangming Hong,Zhao 대한암학회 2019 Cancer Research and Treatment Vol.51 No.3

Purpose Rituximab with cyclophosphamide, doxorubicin, vincristine, and prednisone administered every 3 weeks (R-CHOP-21) is the standard care for diffuse large B-cell lymphoma (DLBCL). It is unknown whether the dose-dense R-CHOP (R-CHOP-14) could improve the outcome of the disease in Asian population. Materials and Methods Newly diagnosed DLBCL patients were centrally, randomly assigned (1:1) to receive R-CHOP- 14 or R-CHOP-21. R-CHOP-14 was administered every 2 weeks, and R-CHOP-21 was administered every 3 weeks. Primary end point was disease-free survival (DFS). Secondary end points included overall survival (OS), progression-free survival (PFS), response rate and toxicities. Results Seven hundred and two patients were randomly assigned to receive R-CHOP-14 (n=349) or R-CHOP-21 (n=353). With a median follow-up of 45.6 months, the two groups did not differ significantly in 3-year DFS (79.6% for R-CHOP-14 vs. 83.2% for R-CHOP-21, p=0.311), 3-year OS (77.5% for R-CHOP-14 vs. 77.6% for R-CHOP-21, p=0.903), or 3-year PFS (63.2% for R-CHOP-14 vs. 66.1% for R-CHOP-21, p=0.447). Patients with an International Prognostic Index (IPI) score ! 2 had a poorer prognosis compared to those with an IPI score < 2. Grade 3/4 hematologic and non-hematologic toxicities were manageable and similar between R-CHOP-14 and R-CHOP-21. Conclusion R-CHOP-14 did not improve the outcome of DLBCL compared to R-CHOP-21 in Asian population. With manageable and similar toxicities, both of the two regimens were suitable for Asian DLBCL patients. For high-risk patients with IPI ! 2, new combination regimens based on R-CHOP deserve further investigation to improve efficacy.