Numerical Predication of Rotor-Seal System by an Interpolation Database Method

Xiang Zhang,Yeyin Xu,Guanghe Huo,Renwei Che,Yinghou Jiao 제어로봇시스템학회 2023 제어로봇시스템학회 국제학술대회 논문집 Vol.2023 No.10

The Analysis of the Formation Mechanism of Pakistan’s Strategic Culture

Jiao Nie,Huazhong Tu,Ruijing Qin,Xiang Ma 한국정치사회연구소 2019 한국과 국제사회 Vol.3 No.2

국가가 자주권을 행사하는 것은 전략문화와 강한 상관관계가 있지만 국가의 전략문화의 분류에 대해서는 학자마다 견해가 다르다. 중국 서부의 가장 중요한 인접국가 중 하나인 파키스탄은 중국의 든든한 파트너로서 파키스탄의 전략문화를 이해하는 것은 파키스탄의 국가 정책과 국가가 자주권을 행사하는 행위를 이해하는 데 도움이 될 뿐만 아니라 중국과 파키스탄 양국의 협력관계를 심화시키는 데도 도움이 된다. 저자는 지리, 사회, 경제, 문화, 역사, 군사 등의 관점에서 볼 때 파키스탄의 전략적 문화 형성의 메커니즘은 주로 지정학적 환경, 생산방식, 생활방식, 문화적 전통, 역사적 경험과 대외 관계 등 네 가지 요인의 영향을 받는다. 분석 결과로 파키스탄의 전략 문화는 이슬람에 의해 형성되어 왔고, 대외 지향적인 전략 문화로 분류될 수 있으며 국가가 자주권을 행사하는 거도 이슬람적인 색채가 강하다. The state behavior has a strong consequence with the national strategic culture. However, different scholars hold different views on the classification of the national strategic culture. As one of the most significant land neighbors in West China, Pakistan is China’s all-weather strategic cooperative partner. Understanding Pakistan’s strategic culture will not only help understand Pakistan’s national policies and state behavior, but also help deepen China-Pakistan cooperation. Cutting in from the perspectives of geography, social economy, culture, history and military, the author believes that the formation mechanism of Pakistan’s strategic culture is mainly affected by the following four factors: geopolitical environment, production mode and lifestyle, cultural tradition, historical experience and diplomatic relations. The analysis has found that Pakistan’s strategic culture has been shaped by Islam and can be classified as an outward-oriented strategic culture, the state behavior also shows a strong Islamic identity.

Covalent Immobilization of Arginine onto Polyacrylonitrile-Based Membrane for the Effective Separation of Oil/Water Emulsion

Xiang Shen,Peng Liu,Jiao Xu,Teng Liu,Jianjun Liu,Xianfu Shen,Shubiao Xia,Fan Wang 한국고분자학회 2018 Macromolecular Research Vol.26 No.13

Membrane technology has been accepted as a very effective approach to purify oily wastewater. However, the serious membrane fouling induced by the adsorption of oily foulants significantly hinders the development of membrane technology in treating oily wastewater. To improve the anti-fouling property and oil/ water separation efficiency of membrane, this work reports on the covalent immobilization of short-chain arginine (Arg) molecules onto polyacrylonitrile/polyacrylonitrile- co-poly(glycidyl methacrylate) (PAN/PAN-co-PGMA) blend membrane surface via a ring-opening reaction between epoxy groups and amine groups. It was found that the covalent immobilization of Arg molecules effectively increased the surface hydrophilicity of the membrane, resulting in a significant decrease of the interaction force between the foulants and the membrane surface. This typical characteristic was revealed by the pure water contact angle and the force-extension curve measurements. The Arg-immobilized membranes exhibited much higher separation efficiency against oil/water emulsions than the pristine PAN and PAN/PAN-co-PGMA membranes. Especially when the grafting amount of Arg was 157.3 μg/cm2, the oil rejection ratio of an Arg-immobilized membrane was as high as 99.2%. In addition, the flux recovery ratio of the membrane still reached 88.8%, even after two cycle filtrations of pure water and oil/water emulsion. These results indicated that the Arg-immobilized membrane may have practical applications for oil/water emulsion separation.

Computational Study on the Rotordynamic of the Hole Diaphragm Labyrinth Seal

Xiang Zhang,Yinghou Jiao,Xiuquan Qu,Guanghe Huo 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11

The seal structure is an efficient way to reduce leakage and improve rotor stability in gas turbine machines. Various seals have been proposed to achieve this goal in the last century. Labyrinth seals (LS), one of those seals, are widely used in industry due to their relatively simple structure. This paper studied whirl radius dependence of hole diaphragm labyrinth seal (HDLS), which designed by adding hole-diaphragms in LS. A series of working conditions of whirl frequencies, rotation speeds and whirl radius rates were considered in simulations. The characteristic parameters in the rotordynamic model of the seal rotor system were calculated. The results show that a better stiffness performance of HDLS was obtained than those of LS and diaphragm labyrinth seal (DLS) on the small whirl radius. The effective damping of HDLS is slightly better than that of LS but moderately worse than that of DLS at higher rotation speeds. The adaptability under multiple working conditions of HDLS represents its feasibility, which can be used in seal-rotor systems. The analysis of the new type of labyrinth seal proposed in this paper confirmed some advantages in gas turbine and steam turbine applications and is worthy of further study.

Nitrogen and Fluorine Dual-Doped Carbon Nanosheets for High-Performance Supercapacitors

Chen Jiao,Zhong Jie Zhang,Xiang Ying Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4

Doping carbon materials with heteroatoms such as N, F is an effective approach to elevating the capacitive performance of supercapacitors. In this paper, nitrogen and fluorine dual-doped two-dimensional (2D) porous carbon nanosheets (PCNSs) have been fabricated by a straightforward template carbonization method, using trisodium citrate as carbon source and self-template, and ammonium fluoride as N/F dopants. The N/F-doped carbon samples are well characterized by a series of techniques and measured in a three-electrode system and two-electrode system, respectively. As a result, N/F-doped carbon has delivered large capacitance of 110 F g -1 at 1 Ag -1 and high-energy density of 3.82 W h kg -1 at the power density of 0.5 kW kg -1. It is also revealed that semi-ionic C–F bonds in PCNSs have enhanced electrical conductivity, hence, facilitating electron transport in the electrode. For comparison, ammonium chloride is used as sole dopant for producing N-doped carbon materials, whose capacitive performances are much lower than the N/F-codoped one, indicating the synergistic effect of N/F for capacitive improvement.

An Improved Interval AHP Method for Assessment of Cloud Platform-based Electrical Safety Monitoring System

Shou-Xiang Wang,Lei-Jiao Ge,Sheng-Xia Cai,Dong Zhang 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2

Electrical safety monitoring System (ESMS) is a critical component in modern power systems, which is characterized by large-scale access points, massive users and versatile requirements. For convenience of the information integration and analysis, the software development, maintenance, and application in the system, the cloud platform based ESMS is established and assessed in this paper. Firstly the framework of the system is proposed, and then the assessment scheme with a set of evaluation indices are presented, by which the appropriate cloud product can be chosen to meet the requirements of a specific application. Moreover, to calculate the weights of the evaluation indices under uncertainty, an improved interval AHP method is adopted to take into consideration of the fuzziness of expert scoring, the qualitative consistency test, and the two normalizations in the process of eigenvectors. Case studies have been made to verify the feasibility of the assessment approach for ESMS.

Systematic Review of Single Large and/or Multinodular Hepatocellular Carcinoma: Surgical Resection Improves Survival

Yang, Xiang-Di,Pan, Ling-Hui,Wang, Lin,Ke, Yang,Cao, Ji,Yang, Chun,Zhong, Jian-Hong,Luo, Wang,Guo, Jiao,Li, Le-Qun Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.13

Background: The role of surgical resection for patients with single large (${\geq}5cm$) and/or multinodular (${\geq}2$) hepatocellular carcinoma (HCC) is still controversial. This systematic review was performed to evaluate the safety and efficacy of resection for patients with single large and/or multinodular HCC. Materials and Methods: Databases (the PubMed, Web of Science, Embase, and Cochrane databases) were systematically searched to identify relevant studies exploring the safety and efficacy of resection for single large and/or multinodular HCC, published between January 2000 and December 2014. Perioperative morbidity and mortality, overall survival, and disease-free survival of the resection group were calculated. In addition, these outcome variables were also calculated for the control group in the included studies. Results: One randomized controlled trial and 42 nonrandomized studies involving 9,580 patients were eligible for analysis. Eight (1,594 patients) of the 43 studies also reported the outcomes of transarterial chemoembolization (TACE). Although 51.4% of patients featured cirrhosis, 90.7% of them demonstrated Child-Pugh A liver function in the resection group. The median rates of morbidity (24.5%) and mortality (2.5%) after resection were significantly higher than that of TACE (11.0%, P<0.001; 1.9%, P<0.001). However, patients who underwent resection had significantly higher median one-, three-, and five-year overall survival (76.1%, 51.7%, and 37.4%) than those who underwent TACE (68.3%, 31.5%, and 17.5%, all P<0.001). The median 1-, 3-, and 5-year DFS rates after resection were 58.3%, 34.6%, and 24.0%, respectively. Conclusions: Although tumor recurrence after resection for patients with single large and/ or multinodular HCC continues to be a major problem, resection should be considered as a strategy to achieve long-term survival.

Progress in Preparation of Cellulase from Lignocellulose Using Fungi

Hui Jiao,Xiang-Yang Song,Chenhuan Lai,Hao Fang,Yuqi Song,Junjun Zhu 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.6

Lignocellulosic biomass such as agricultural and forestry waste is the most abundant renewable organic carbon source on earth and can be used to produce source of clean energy such as ethanol. One of the disadvantages of the preparation of ethanol using lignocellulose as raw material is the high cost of production of cellulase. Fungi are capable of effectively degrading lignocellulose and secreting a large amount of cellulase, and have the advantages of ease of preparation, high yield, and full enzyme systems. Therefore, this paper reviews sources of lignocellulose and the biodegradation properties which limit the production of cellulase, proposes micro-organisms capable of degrading lignocellulose and explains the types of cellulase, and the mechanism of action, methods of fermentation optimization, and control are analyzed, and ways to increase the yield of cellulase are described. Finally, research on the effects of inducers on the production of cellulase by fungi is reviewed. The aims of this review are to provide a reference for the efficient production and industrial application of cellulase.

Impact of single metal oxide and coal ash on secondary ultrafine particle generation through SO₂ and NO₂ heterogeneous reaction

Ru-Jiao Song(숭루죠),Zi-Xiang Xu(쉬지샹),Joo-Chang Park(박주창),Li-Hua Xu(허려화),Hyung-Taek Kim(김형택) 한국환경에너지공학회 2020 열환경공학 Vol.15 No.1

Cytotoxic T Lymphocytes Elicited by Dendritic Cell-Targeted Delivery of Human Papillomavirus Type-16 E6/E7 Fusion Gene Exert Lethal Effects on CaSki Cells

Wu, Xiang-Mei,Liu, Xing,Jiao, Qing-Fang,Fu, Shao-Yue,Bu, You-Quan,Song, Fang-Zhou,Yi, Fa-Ping Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6

Human papillomavirus (HPV) is the primary etiologic agent of cervical cancer. Consideration of safety and non human leukocyte antigen restriction, protein vaccine has become the most likely form of HPV therapeutic vaccine, although none have so far been reported as effective. Since tumor cells consistently express the two proteins E6 and E7, most therapeutic vaccines target one or both of them. In this study, we fabricated DC vaccines by transducing replication-defective recombinant adenoviruses expressing E6/E7 fusion gene of HPV-16, to investigate the lethal effects of specific cytotoxic T lymphocytes (CTL) against CaSki cells in vitro. Mouse immature dendritic cells (DC) were generated from bone marrow, and transfected with pAd-E6/E7 to prepare a DC vaccine and to induce specific CTL. The surface expression of CD40, CD68, MHC II and CD11c was assessed by flow cytometry (FCM), and the lethal effects of CTL against CaSki cells were determined by DAPI, FCM and CCK-8 methods. Immature mouse DC was successfully transfected by pAd-E6/E7 in vitro, and the transfecting efficiency was 40%-50%. A DC vaccine was successfully prepared and was used to induce specific CTL. Experimental results showed that the percentage of apoptosis and killing rate of CaSki cells were significantly increased by coculturing with the specific CTL (p <0.05). These results illustrated that a DC vaccine modified by HPV-16 E6/E7 gene can induce apoptosis of CaSki cells by inducing CTL, which may be used as a new strategy for biological treatment of cervical cancer.