Preparation of activated carbon spheres and their electrochemical properties as supercapacitor electrode

An Xin,Xing Guannan,Wang Jing,Tian Yanhong,Liu Yunfang,Wan Qiong 한국탄소학회 2021 Carbon Letters Vol.31 No.4

The carbon spheres (CSs) synthesized by an ultrasonic-spray pyrolysis method were activated for supercapacitor electrode. There are plenty of cracks on the surface of the activated carbon spheres (ACSs), which expend with increasing the activation temperature and activator dosage. The specifc capacitance of ACSs increases with the activation temperature and activator dosage and reach to maximal value at certain conditions. Importantly, the ACS sample activated at relatively low activation temperature (600 °C) and 7 of mass ratio of KOH to CSs has the highest specifc capacitance (about 209 F g−1 at 50 mA g−1 of current density) and indicates the excellent cycling stability after 1000 consecutive charge–discharge cycles. Furthermore, the graphene sheets could be found in the samples that were activated at 1000 °C. And the electrode prepared by the sample has the very low series resistance because of the excellent conductivity of the formed graphene sheets.

Effects of habitat fragmentation on the functional diversity of insects in Thousand Island Lake, China

Tian‐Hao Tu,Ji-Rui WANG,Jian-Qiang GU,Tian-Qi LI,Kun LV,Guo-Xin ZHOU,Zhi-Hong XU 한국곤충학회 2019 Entomological Research Vol.49 No.2

Due to habitat fragmentation, the loss of species diversity has been extensively studied. On the contrary, the effects of habitat fragmentation on functional diversity is still poorly understood. In the Thousand Island Lake, we conducted studies of insect functional diversity on a set of 29 isolated islands. We used 10 functional diversity indices from three aspects (functional richness, functional evenness and functional divergence) to respectively describe functional diversity of insects on sample islands. We found the following results: (i) The functional indices selected could reflect the functional diversity of sample islands and it is further proved that in general, three components of functional diversity were independent of each other; (ii) Sample islands could be divided into two categories, island JSD and the remaining islands; (iii) Functional richness increased with island area and shape index, but had no significant correlation with isolation. Likewise, both functional evenness and functional divergence had no significant correlation with island attributes. The conclusion to emphasize from our research is that: (i) habitat fragmentation reduced the biological functional diversity to some extent, further demonstrating the importance of habitat continuity in biodiversity protection; and (ii) for functional diversity protection of insects in a fragmented landscape, an island which has high approximate shape index values of at least hundred hectare magnitude order has a critical promoting effect.

Singularity analysis and workspace optimization of a novel symmetrical 4-limb 5-DOF hybrid robot

Xin Tian,Tieshi Zhao,XiaoXiao Peng,Erwei Li 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5

Considering the complex structure and large size of multiple axes rotary spindle heads and the small workspace of parallel modules, a 5-degree of freedom (DOF) hybrid robot is proposed, which is a symmetrical 4-limb parallel module in series with a single axis rotary spindle head. Screw theory was used to analyze the mobility and kinematics of the hybrid mechanism. The singularity of the symmetrical 4-limb parallel module was studied, and the analysis results were verified by the Grassmann linear geometry principle. According to the singularity analysis results, the kinematic pairs’ positions of the robot were determined, so the hybrid robot model was constructed. Considering the workspace volume, and optimizing the Latin hypercube sample algorithm, a combinatorial numerical optimization algorithm is proposed to optimize dimension parameters of this hybrid robot, which combines non-linear programming by quadratic Lagrangian (NLPQL) algorithm with the optimized Latin hypercube sampling (Opt LHS) algorithm. Through this optimization algorithm, the workspace volume of the robot is increased by 1.93 times. The research method in this paper is also suitable for the analysis and optimization of other hybrid robots.

Isocoumarin Derivatives from the Sea Squirt-derived Fungus Penicillium stoloniferum QY2-10 and the Halotolerant Fungus Penicillium notatum B-52

Xin, Zhi-Hong,Tian, Li,Zhu, Tian-Jiao,Wang, Wen-Liang,Du, Lin,Fang, Yu-Chun,Gu, Qian-Qun,Zhu, Wei-Ming 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.7

Two isocoumarin derivatives, stoloniferol A (1) and B (2), a known $5{\alpha}$, $8{\alpha}-epidioxy-23-methyl-(22E, 24R)-ergosta-6$, $22-dien-3{\beta}-ol$ (3), and a known dihydrocitrinone (4) were isolated from the ethyl acetate extract of the sea squirt-derived fungus, Penicillium stoloniferum QY2-10, and a halophilic fungus, Penicillium notatum B-52, respectively. Their structures were elucidated by spectroscopic methods and optical rotation. The stereochemistry of 2 was determined on the basis of different NOE experiments and chemical transformation. Compound 3 showed cytotoxicity against P388 cells, with an $IC_{50}$ value of 4.07 ${\mu}M$.

Influence of Diffuser Vane Number on Energy Loss of Multistage Centrifugal Pump

Tian Xin Wu,Deng Hao Wu,Ting Zhang,Hai Ming Huang,Yue Zhong Wu,Jie Gang Mou 한국유체기계학회 2021 International journal of fluid machinery and syste Vol.14 No.4

As a key component of a multistage pump, the diffuser affects the efficiency of the multistage centrifugal pump. However, the loss mechanism inside the diffuser and links between the loss mechanism and vane numbers of diffuser were still not fully understood. In order to investigate the influence of the number of diffuser vane on the energy loss characteristics of multistage centrifugal pump, this paper analyzes the energy loss characteristics of pump with different number of diffuser vane by utilizing entropy production theory. The results show that under the design condition, when the number of diffuser vane increases to 11, the head is increased by 1.2m and the efficiency is increased by 3%. At the same time, with the increase of the number of diffuser vane, the backflow and eddy phenomena are gradually weakened, flow stream is more stable, the entropy production rate is significantly reduced, but the intensity of pressure pulsation in the diffuser is increased slightly.

Association Between MDM2 SNP309 T>G and Risk of Gastric Cancer: A Meta-analysis

Tian, Xin,Tian, Ye,Ma, Ping,Sui, Cheng-Guang,Meng, Fan-Dong,Li, Yan,Fu, Li-Ye,Jiang, Tao,Wang, Yang,Ji, Fu-Jian,Fang, Xue-Dong,Jiang, You-Hong Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3

Background: As a negative regulator of P53, MDM2 plays an important role in carcinogenesis; a polymorphism in its promoter region. SNP309 T>G, is known to increase the expression of MDM2, thus being considered related to higher susceptibility to neoplasia. However, no agreement has been achieved regarding its effects on gastric cancer. Methods: The present systematic meta-analysis was performed based on comprehensive literature search from Pubmed, Web of science and CBM databases. Results: It was suggested from 6 independent studies that the GG genotype is associated with a significantly increased risk of gastric cancer (Recessive: OR = 1.43, 95% CI = 1.08-1.91, P = 0.013), and subgroup analysis also confirmed the relationship (English publications-recessive model: OR = 1.45, 95% CI = 1.10-1.91, P = 0.009; Studies in China-recessive model: OR = 1.58, 95% CI = 1.08-2.30, P = 0.017). No publication bias was detected. Conclusion: The meta-analysis indicated a significant inverse association between GG genotype carriage and elevated risk of gastric cancer. However, more studies and detailed information are needed to fully address the topic.

인터넷쇼핑몰의 서비스품질이 관계품질 및 고객유지에 미치는 영향

이신전(Xin-Tian Li),펑펑(PENGPENG) 한국콘텐츠학회 2013 한국콘텐츠학회논문지 Vol.13 No.11

인터넷쇼핑몰의 시장이 점점 확장되고 경쟁이 심화되기 때문에 인터넷쇼핑몰의 서비스품질은 더욱 중시되고 있다. 또한 서비스품질에 따라 인터넷쇼핑몰의 고객유지에 대한 관심이 많이 생겼으며 인터넷쇼핑몰의 서비스품질의 차별화가 성공요인이 되고 있다. 이에 따라 논문에서는 인터넷쇼핑몰의 서비스요인에 대해 살펴보고 실제 인터넷쇼핑몰에서 제품을 구매한 경험이 있는 고객들을 대상으로 하여 설문조사를 실시함으로써 이들 간의 관계를 실제적으로 규명해 보고자 한다. 결과적으로, 서비스품질은 고객만족에 대한 긍정적인 영향관계가 있는 것으로 밝혀졌다. 그리고 고객만족, 신뢰와 몰입 간에 유의한 긍정적인 관계를 가지고 있으며 고객유지에 대해 긍정적인 영향을 미치는 것으로 밝혀졌다. 이러한 연구 결과를 통하여 인터넷쇼핑몰에서 소비자의 신뢰, 만족 및 몰입을 높이기 위해서는 단일 차원이 아닌 다차원적인 개념으로 통합적으로 행사하여야 함을 알 수 있다. 그러므로 고객과의 관계품질을 형성하는 것은 중요하며, 고객과의 장기적인 관계를 형성할 수 있는 방안을 모색해야 할 것이다. The customer retention of internet shopping mall become important nowadays as internet shopping mall is expanding quickly. In this situation, the present study aims to analyze the components of internet shopping mall service quality and its relationship with satisfaction, and retention. The CRM is a very important point for company marketing, it is also necessary to construct trust and commitment. Especially it has been recognized that when we deal with online shopping, the correlation with customers is very important. At this point one purpose of this study is to find out those effects on satisfaction of the service quality. Another purpose is to find the factors which effect retention. Structural equation modeling is used to test the model building in this paper based on the data from survey of 223 online shopping mall customers. The results in the study provide our supports to the model and indicate that: first, service quality has a positive effect on satisfaction. Second, satisfaction, trust and commitment have strong relations and they affect customer retention in the internet shopping mall service.

Tools Setting of 5 Axis Ultra-Precision Single point Diamond Lathe without OTS

Ke-Tian Li,Xin Chen,Xin-Du Chen,Qiang Liu,Xiang-bo Ouyang,Hong-Jian Xia,Jian-Qun Liu 한국생산제조학회 2014 한국생산제조시스템학회 학술발표대회 논문집 Vol.2014 No.9(2)

문화지능이 이문화 적응, 해외 체류만족과 직무성과에 미치는 영향

이신전(Xin Tian Li) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.11

본 연구에서는 문화지능과 이문화 적응, 체류만족과 직무성과 간의 상관관계를 규명하기 위한 연구모형과 가설을 도출하고 한국에서 연수 또는 근무하는 중국인 근로자 188명을 대상으로 검증하였다. 결과적으로 문화지능은 이문화 적응에 긍정적 관계를 가지고 있는 것으로 밝혀졌다. 그리고 이문화 적응과 체류만족, 직무성과 간의 관계에 대한 경험분석에서는 문화지능이 높을수록, 그리고 이문화 적응을 잘 할수록 체류만족이 높고 직무성과도 향상되는 것으로 나타났다. 또한 문화지능과 이문화 적응 간의 관계에서 국제경험의 조절효과를 분석하였는데, 국제경험이 많을수록 이문화 적응이 더욱 잘 되는 것으로 밝혀졌다. 이러한 연구 결과는 글로벌 기업에서 해외 파견근로자의 체류만족과 직무성과를 높이기 위해서는 해외파견근로자를 선발할 때 문화지능이 높은 사람들을 우선 고려하고, 그들의 이문화 적응 수준을 향상시켜야 한다는 시사점을 제시하였다. This study aims to analyze the cultural intelligence and its relationship with cross-culture adjustment satisfaction, and performance, and then, we prove the moderating role of international experience between cultural intelligence and cross-culture adjustment with staying in the host country. An exploratory pilot study was conducted with a sample of 188 Chinese expatriates working in Korean company in Korea. Then, we proved the moderating role of international experience between cultural intelligence and cross-cultural adjustment. The results of this study have three implications for human resource development. First this study expanded the research of CQ up to the area of empirical investigation. Second, the empirical findings also supported an incremental and predictive validity that CQ increased explained variance of cross-cultural adjustment. Third, the moderating role of international experience in this study showed the importance of both CQ and international experience with staying in the host country.

Self-assembled wide bandgap nanocoatings enabled outstanding dielectric characteristics in the sandwich-like structure polymer composites

Wang Tian-Yu,Li Xiao-Fen,Liu Shu-Ming,Liu Bai-Xin,Liang Xi-Dong,Li Shunning,Zhang Gui-Xin,Liu Jian-Bo,Dang Zhi-Min 나노기술연구협의회 2022 Nano Convergence Vol.9 No.55

Polymer dielectrics are insulators or energy storage materials widely used in electrical and electronic devices. Polymer dielectrics are needed with outstanding dielectric characteristics than current technologies. In this study, the self-assembly of boron nitride nanosheets (BNNSs) was applied to form an inorganic–organic nanocoating on various common polymer dielectrics. It is inexpensive and easy to fabricate this thin coating on a large scale. The coating has a wide bandgap and thus can significantly improve the breakdown strength of polymer dielectrics. The charge characteristics and trapping parameters of nano-domains on the surfaces of polymer dielectrics were measured, and the coating had shallow trap levels. This facilitated the dissipation of surface charges and thus greatly increased the flashover voltage. The coating also effectively improved the temperature stability and dielectric constant of the polymer dielectric. This nanocoating shows potential as a method to effectively improve the dielectric characteristics of polymer dielectrics and outperform existing composite polymer dielectrics, which are crucial for large-scale applications in energy storage and power and electronic devices.