Nonlinear optical properties of silver colloidal solution by in situ synthesis technique

Yan Deng,Youyi Sun,Pei Wang,Douguo Zhang,Xiaojin Jiao,Hai Ming,Qijing Zhang,Yang Jiao,Xiaoquan Sun 한국물리학회 2008 Current Applied Physics Vol.8 No.1

The silver colloidal solutions were prepared by in situ synthesis technique in the presence of the Polymethyl Methacrylate, which was polymerized by reversible addition-fragmentation transfer. The UV–VIS spectra and transmission electron microscopy had shown the formation of sphere silver nanoparticles with average size of 10 nm. Nonlinear optical properties as a function of silver concentration were studied using Z-scan technique with 13 ns pulse duration at 532 nm. The optical nonlinearity enhancement was observed by increasing the concentration. The third-order nonlinear susceptibility v(3) was measured to 1.045 · 1011 esu when the concentration was 2.13 mg/ml. Besides, the sample was founded to exhibit a shift from saturable absorption to reverse saturable absorption at higher incident laser energy. The reverse saturable absorption was observed to be responsible for the optical limiting characteristics in our experiments. 2007 Published by Elsevier B.V. The silver colloidal solutions were prepared by in situ synthesis technique in the presence of the Polymethyl Methacrylate, which was polymerized by reversible addition-fragmentation transfer. The UV–VIS spectra and transmission electron microscopy had shown the formation of sphere silver nanoparticles with average size of 10 nm. Nonlinear optical properties as a function of silver concentration were studied using Z-scan technique with 13 ns pulse duration at 532 nm. The optical nonlinearity enhancement was observed by increasing the concentration. The third-order nonlinear susceptibility v(3) was measured to 1.045 · 1011 esu when the concentration was 2.13 mg/ml. Besides, the sample was founded to exhibit a shift from saturable absorption to reverse saturable absorption at higher incident laser energy. The reverse saturable absorption was observed to be responsible for the optical limiting characteristics in our experiments. 2007 Published by Elsevier B.V.

인공지능을 활용한 교육 사례 연구에 따른 언어지능 교육 연구 - 온라인 세종학당 한국어 AI 튜터를 중심으로 -

Jiao Yan 한국경영실무학회 2022 한국경영실무학회 학술발표대회 Vol.2022 No.11

General laws of precise asymptotics for sums of random variables

Yan-Jiao Meng 대한수학회 2012 대한수학회지 Vol.49 No.4

In this paper, we obtain two general laws of precise asymptotics for sums of i.i.d random variables, which contain general weighted functions and boundary functions and also clearly show the relationship between the weighted functions and the boundary functions. As corollaries,we obtain Theorem 2 of Gut and Spataru [A. Gut and A. Spataru,Precise asymptotics in the law of the iterated logarithm, Ann. Probab. 28 (2000), no. 4, 1870{1883] and Theorem 3 of Gut and Spataru [A. Gut and A. Spataru, Precise asymptotics in the Baum-Katz and Davids laws of large numbers, J. Math. Anal. Appl. 248 (2000), 233{246].

Energy Internet : Convergence of smart grid, energy network and the Internet

Yan Jiao(초염) 대한전기학회 2016 대한전기학회 학술대회 논문집 Vol.2016 No.11

Energy-Efficient Resource Allocation for Heterogeneous Cognitive Radio Network based on Two-Tier Crossover Genetic Algorithm

Yan Jiao,조인휘 한국통신학회 2016 Journal of communications and networks Vol.18 No.1

Cognitive radio (CR) is considered an attractive technologyto deal with the spectrum scarcity problem. Multi-radioaccess technology (multi-RAT) can improve network capacity becausedata are transmitted by multiple RANs (radio access networks)concurrently. Thus, multi-RAT embedded in a cognitiveradio network (CRN) is a promising paradigm for developing spectrumefficiency and network capacity in future wireless networks. In this study, we consider a new CRN model in which the primaryuser networks consist of heterogeneous primary users (PUs). Specifically, we focus on the energy-efficient resource allocation(EERA) problem for CR users with a special location coverageoverlapping region in which heterogeneous PUs operate simultaneouslyvia multi-RAT. We propose a two-tier crossover geneticalgorithm-based search scheme to obtain an optimal solution interms of the power and bandwidth. In addition, we introduce aradio environment map to manage the resource allocation and networksynchronization. The simulation results show the proposedalgorithm is stable and has faster convergence. Our proposal cansignificantly increase the energy efficiency.

A New 3D Empirical Plastic and Damage Model for Simulating the Failure of Concrete Structure

Yan-tao Jiao,Bo Wang,Zhen-zhong Shen 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.7

A new plastic–damage constitutive model based on the combination of damage mechanics and classical plastic theory was developed to simulate the failure of concrete. In order to explain different material behaviors of concrete under tensile and compressive loadings, the plastic yield criterion, the different kinematic hardening rule for tension and compressive and the isotropic flow rule were established in the effective stress space. Meanwhile, two different empirical damage evolution equations were adopted: one for compression and the other for tension. A multi-axial damage influence factor was also introduced to fully describe the anisotropic damage of concrete. Finally, the model response was compared with a wide range of experiment results. The results showed that the model could well describe the nonlinear behavior of concrete in a complex stress state.

Efficacy and Safety of the Safe Triangular Working Zone Approach in Percutaneous Vertebroplasty for Spinal Metastasis

Yan Bi Cong,Fan Yan Feng,Tian Qing Hua,Wang Tao,Huang Zhi Long,Song Hong Mei,Li Ying,Jiao Lei,Wu Chun Gen 대한영상의학회 2022 Korean Journal of Radiology Vol.23 No.9

Objective: This study aimed to assess the technical feasibility, efficacy, and safety of the safe triangular working zone (STWZ) approach applied in percutaneous vertebroplasty (PV) for spinal metastases involving the posterior part of the vertebral body. Materials and Methods: We prospectively enrolled 87 patients who underwent PV for spinal metastasis involving the posterior part of the vertebral body, with or without the STWZ approach, from January 2019 to April 2022. Forty-nine patients (27 females and 22 males; mean age ± standard deviation [SD], 57.2 ± 11.6 years; age range, 31–76 years) were included in group A (with STWZ approach), accounting for 54 vertebrae. Thirty-eight patients (18 females and 20 males; 59.1 ± 10.9 years; 29–81 years) were included in group B (without STWZ approach), accounting for 57 vertebrae. Patient demographics, procedure-related variables, and pain relief as assessed using the visual analog scale (VAS) were collected at different time points. Tumor recurrence in the vertebrae after PV was analyzed using Kaplan–Meier curves. Results: The STWZ approach was successful from T1 to L5 without severe complications. Cement filling was satisfactory in 47/54 (87.0%) and 25/57 (43.9%) vertebrae in groups A and B, respectively (p < 0.001). Cement leakage was not significantly different between groups A and B (p = 1.000). Mean VAS score ± SD before and 1 week and 1, 3, 6, 9, and 12 months after PV were 7.6 ± 1.8, 4.2 ± 2.0, 2.7 ± 1.9, 1.9 ± 1.5, 1.7 ± 1.4, 1.7 ± 1.1, and 1.6 ± 1.3, respectively, in group A and 7.2 ± 1.7, 4.0 ± 1.3, 3.4 ± 1.6, 2.4 ± 1.2, 1.8 ± 1.0, 1.4 ± 0.5, and 1.7 ± 0.9, respectively, in group B. Kaplan–Meier analysis showed a lower tumor recurrence rate in group A than in group B (p = 0.001). Conclusion: The STWZ approach may represent a new, safe, alternative/auxiliary approach to target the posterior part of the vertebral body in the PV for spinal metastases.

现代汉语中 “被”、“把”同现套用句的立体分析

Yan Jiao Lian 중국어문연구회 2016 中國語文論叢 Vol.0 No.75

The BEI sentence and the BA sentence as two kinds of important and special sentences in the modern Chinese language, is valued by grammar educational circles in times gone by, is a hot spot in Chinese grammar research.But the current research is still constrained by only to the separate investigation about the BEI sentence and the BA sentence, has not been able to detailly contemplate to the two kinds of phenomenon. This thesis tries to with phrasing the research object postpones theory-phrasing "three planes" ories of the research outside for rely on, with the content of the phrasing rule thinking-phrasing research of theories in“three worlds”(“set form phrasing world”, “release righteousness phrasing world and spread interest phrasing world”) for assist, under the dual vision of the outside and the content, Adopting with the analytical method of total hour, static state and dynamic state combined together, to contemplate the “BEI” “BA” nestification sentence that presents toghter with all-directions, multilayers contemplation.

The Prediction of Ship Motions and Added Resistance based on RANS

Jiao Yan,Dingqi Pan,Xiaomin Zhou,Ketai He 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

In this paper, numerical predictions of ship motions and added resistance in regular head waves by solving the unsteady Reynolds average Navier-Stokes (RANS) equations with a shear-stress transport (SST) κ-ω turbulence model is presented. Volume of fluid method (VOF) is applied for the treatment of the free surface. The Wigley III ship model has been computed using the unsteady RANS solver Fluent. The simulations have been carried out to measure the heaving and pitching motions in regular head waves which covered seven different wavelengths. The Froude number of the hull are 0.2, 0.3 and 0.4. By comparing the results with the strip theory based results and experimental data, the unsteady RANS method shows better accuracy in predicting ship motions.

Exploring the Development of E-commerce for Fresh agricultural Products under the Background of E-commerce Law

Yan-Jiao Wan,Zhi-Chun Yu 한국인터넷전자상거래학회 2020 인터넷전자상거래연구 Vol.20 No.6

E-commerce of fresh agricultural products has received China’s attention in recent years. The e-commerce law effectively guides and promotes the e-commerce of fresh agricultural products to develop in a healthy and sustainable direction. The "E-commerce Law" ended the cruel development of new e-commerce, clearly regulated e-commerce behavior and protected the rights and interests of consumers, which was a milestone. China’s fresh agricultural products e-commerce started later than e-commerce. It started in 2005 and developed steadily in 2012, and the pressure it faces in 2020 will increase. Relying on China’s unique huge consumer market and government attention and support, big data is expected to increase the growth rate of global fresh agricultural e-commerce. This paper explores the development of e-commerce for fresh agricultural products in the context of e-commerce law. Within the scope of the e-commerce law, the sustainable development of e-commerce for fresh agricultural products requires the realization of small-scale e-commerce and strengthen the cold chain logistics capabilities of fresh agricultural products e-commerce companies, improve production standardization and intensification, provide a basis for large-scale fresh agricultural product e-commerce procurement, effectively reduce the loss of fresh agricultural products circulation, and make fresh agricultural products much fresher.