Barrier Optical Waveguide Fabrication in LiNbO3 Crystal by 4.5-MeV LithiumIon Implantation with Low Dose

Xue-Lin Wang,Ding-Yu Shen,Gang Fu,Hong-Ji Ma,Ke-Ming Wang,Rui Nie,Shi-Ling Li 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1

A barrier planar waveguide was fabricated in z-cut LiNbdO3 crystals by 4.5-MeV lithium ion implantation at a dose of 3 £ 1014 ions/cm2 at room temperature. Dark modes were observed by the prism-coupling method with wavelengths of both 633 nm and 1539 nm. The refractive index pro¯les were reconstructed by using the re°ectivity calculation method. There were about 1.1 % and 0.7 % decreases at the optical barriers of the ordinary and extraordinary refractive index at the wavelength at 633 nm, and the positions of the optical barriers were close to those of the damage peaks calculated by the TRIM098 (Transport of Ions in Matter) code. It is found that the refractive index change may be partly due to the damage induced by nuclear collision.

Experimental Study on the Properties of Phosphate-Based Materials for Rapid Repair of Concrete Cracks

Rui Wang,Anxiang Song,Xiang Chen,Yuanchen Guo,Xue Wang,Yan Sun,Miao Tian 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5

This article studies rapid repair materials by mainly carrying out macro- and micro-performanceimpact tests. The static volumetric method was used to conduct pore volume-aperture analysis and prove the impact of the durability and repair performance of materials. The results show that 1) material impermeability can be effectively improved by increasing the ratio of active ingredients A:B and reducing the water-to-binder ratio. Adding an appropriate amount of fine aggregate can enable one to adjust the microstructure of the repair material, improve the compactness of the material, and effectively improve the impermeability. 2) An increase in the proportion of active ingredient A, water-binder ratio, sand-cement ratio and fly ash content will reduce the self-shrinkage of the specimen; with increasing NS and silica fume content, shrinkage increases. 3) Through analysis of pore size and pore volume, the total pore volume of the repair material is found to be reduced by 16.0% compared with cement mortar. Within a pore diameter range of 2.00 − 10.00 nm, the volume of the repair material increases by 78.9% compared to that for cement mortar. The total volume of the mesopores (2 − 50 nm) in the repair material accounts for 87.7% of the total volume, and the total volume of the mesopores in the cement mortar accounts for 81.23% of the total volume, which further illustrates the excellent macroscopic properties of the repair material.

High selectivity and removal efficiency of lotus root-based activated carbon towards Fe(III) in La(III) solution

Rui-Yan Wu,Yong Wang,Xiao-Yan Xue,Fu-Qiang An,Tuo-Ping Hu,Jian-Feng Gao 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.3

Rare earth elements are an important strategic resource. However, a trace of Fe(III) impurity has serious adverse impact on the performance of rare earth materials. We synthesized a novel nitrogen-containing carbon material, ACLR-400, using lotus root as raw materials. The ACLR-400 was characterized by surface area analyzer, elemental analysis and FT-IR. The selectivity and removal efficiency of ACLR-400 towards Fe(III) were also investigated. The BET specific surface area of ACLR-400 was 68.44m2·g−1, and the average pore diameter was 12.54 nm. With abundant nitrogen- containing functional groups and well-developed internal pore structure, ACLR-400 possesses strong adsorption affinity, excellent selectivity and removal efficiency for Fe(III). The adsorption capacity of ACLR-400 towards Fe(III) could reach to 0.46mmol·g−1, selectivity coefficient with respect to La(III) was 8.9, and removal efficiency was 99.61%. The adsorption isotherm data greatly obey the Freundlich isotherm. In addition, ACLR-400 can be regenerated easily and possesses better regeneration ability and reusability.

Association Between Green Tea and Colorectal Cancer Risk: A Meta-analysis of 13 Case-control Studies

Wang, Xue-Jun,Zeng, Xian-Tao,Duan, Xiao-Li,Zeng, Huan-Chao,Shen, Rui,Zhou, Ping Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.7

Objective: Experimental studies have suggested green tea to be a chemopreventive agent for colorectal cancer, and many studies have examined possible associations. However, the conclusions were inconsistent or even contradictory, so we performed a meta-analysis based on published case-control studies to explore if green tea is indeed a protective factor. Methods: PubMed was searched up to May $10^{th}$, 2012 for relevant studies, and references of included studies were manually searched. Finally 13 eligible studies, involving 12,636 cases and 38,419 controls were identified. After data extraction, a meta-analysis was performed using CMA v2 software. Results: The results indicated there may be a weak but not statistically significant reduced risk of colorectal cancer with high dose of green tea intake (OR=0.95, 95% CI:0.81-1.11, p=0.490.69-0.98). This protective effect was also found in all subgroups, except in American and European populations. Sensitivity analysis indicated the result to be robust. Publication bias was not detected by either funnel plot or Egger tests. Conclusion: The results of this meta-analysis indicate a weak lower tendency for colorectal cancer development with green tea consumption, but available epidemiologic data are insufficient to conclude that green tea may protect against colorectal cancer in humans.

High-Precision Tracking Control of a Piezoelectric Micro-nano Platform Using Sliding Mode Control with the Fractional-Order Operator

Rui Xue,Wei Pan,Zhongshi Wang,Dapeng Tian 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.12

In this paper, a sliding mode control using a fractional-order operator (SMCFO) method is presented for the hysteresis of a piezoelectric (PZT) micro-nano platform. At first, the hysteresis of the PZT micro-nano platform is described using the Duhem model. With respect to the sliding mode controller design, we introduce a fractional-order operator into the design of the sliding mode surface and enhance the performance of the proposed controller. The nonlinear switching action of the controller is eliminated through a smooth control action by applying an uncertainty and disturbance estimation technique. The stability of the proposed controller is analyzed using the Lyapunov theorem. Simulations and experimental results demonstrate that the SMCFO method achieves a no-load high precision tracking control of the PZT micro-nano platform and is also robust against load perturbations of the platform

Time-varying H∞ Control for Discrete-time Switched Systems with Admissible Edge-dependent Average Dwell Time

Rui-Hua Wang,Bing-Xin Xue,Jing-Bo Zhao 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.8

The problem of H∞ control for discrete-time switched systems is investigated via admissible edgedependent average dwell time (AED-ADT) method in this paper. By virtue of a convex combination of positive definite matrices, a novel multiple piecewise convex Lyapunov function (MPCLF) is designed, which can relax the restricted conditions of Lyapunov functions at switching points and interval interior points. Based on the MPCLF approach, the time-varying H∞ state feedback controllers, guaranteeing that the corresponding closed-loop system is globally uniformly exponentially stable (GUES) with a prescribed H∞ performance, are established for the considered switched system. Finally, three numerical examples are provided to illustrate the effectiveness of the proposed approaches.

Information Transmission and Innovation : Evidence from China

Xiaohui Wang,Xin Su,Rui Xue,Xueli Zhan 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.8

A Multi-group Multi-agent System Based on Reinforcement Learning and Flocking

Gang Wang,Jian Xiao,Rui Xue,Yongting Yuan 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.7

In this paper, we present an inter-group confrontation and intra-group cooperation method for a predator group and prey group, and construct a multi-group multi-agent system. We model the motion of the prey group using the flocking control algorithm. The prey group can cooperatively avoid predators and maintain the integrity of the group after the predators have been detected. The autonomous decision-making of the predator group is implemented based on the distributed reinforcement learning algorithm. To efficiently share the learning experience among agents in the predator group, a distributed cooperative reinforcement learning algorithm with variable weights is proposed to accelerate the convergence of the learning algorithm. Simulations show the feasibility of this proposed method.

Hepatic Angiomyolipoma: Contrast Patterns with SonoVue-enhanced Real-time Gray-scale Ultrasonography

Wei, Rui-Xue,Wang, Wen-Ping,Ding, Hong,Huang, Bei-Jian,Li, Chao-Lun,Fan, Pei-Li,Hou, Jun,He, Nian-An Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.2

This study was conducted to retrospectively evaluate the pattern of contrast enhancement with SonoVue on gray-scale ultrasonography of hepatic angiomyolipoma (HAML). Imaging features of 33 pathologically proven HAML lesions in 33 patients who underwent baseline ultrasound and contrast-enhanced ultrasonography (CEUS) were assessed retrospectively. All lesions were enhanced in the arterial phase and showed whole-tumor filling in. Thirty-two of 33 (97%) lesions showed early positive enhancement in the arterial phase. Twenty-three of these exhibited isoechoic or hyperechoic features in the portal phase. HAML demonstrate characteristic manifestations with SonoVue-enhanced real-time gray-scale ultrasonography.

中国大学生心理健康研究的计量学分析

Yao Benxian,Rui Xue,Wang Daoyang,이상엽 한국비교정부학회 2010 한국비교정부학보 Vol.14 No.2

College students’ mental health research in China has entered a phase of rapid development. In the past 20 years, it has reached an unprecedented development, and a lot of relevant studies and reports have emerged. The article has been made in approach of accounting method of documents for the contents of 536 theses collected in “Acta Psychologica Sinica”, “Psychological Science”, and “Psychological Development and Education”, “Applied Psychology”, “Chinese Mental Health Journal”. It took frequency and percentage statistics as main method. It analyzed the research fields, the usage of scales and questionnaires, and the distribution power of research institutions and regions. It found that researches of college students’ mental health mainly focused on the four general fields such as self‐concept and self‐awareness, the external environment and recreational activities, mental illness and physical problems. The fields of research were widely very much, involving all kinds of aspects in psychology, physiology, and society. Mental health professionals should pay more attention to choosing job, interpersonal relationship, psychological guidance and treatment about college students. More and more researchers also start to use the scales and questionnaires which they design of their own. And they should choose samples not only in the cities where they live but also in other places.