Decreasing Global Greenhouse Effects by Biochar Amendment in a Double Rice Field of South China

Xiaobo Qin,Yue Li,Yunfan Wan 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

A CORDIC-Jacobi Based Spectrum Sensing Algorithm For Cognitive Radio

( Xiaobo Tan ),( Hang Zhang ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.9

Reliable spectrum sensing algorithm is a fundamental component in cognitive radio. In this paper, a non-cooperative spectrum sensing algorithm which needs only one cognitive radio node named CORDIC (Coordinate Rotation Digital Computer) Jacobi based method is proposed. The algorithm computes the eigenvalues of the sampled covariance of received signal mainly by shift and additional operations, which is suitable for hardware implementation. Based the latest random matrix theory (RMT) about the distribution of the limiting maximum and minimum eigenvalue ratio, the relationship between the probability of false alarm and the decision threshold is derived. Simulations and discussions show the method is effective. Real captured digital television (DTV) signals and Universal Software Radio Peripheral (USRP) are also employed to evaluate the performance of the algorithm, which prove the proposed algorithm can be applied in practical spectrum sensing applications.

Modeling and analysis of a rotational piezoelectric energy harvester with limiters

Xiaobo Rui,Zhoumo Zeng,Yibo Li,Yu Zhang,Zi Yang,Xinjing Huang,Zhou Sha 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11

A rotational piezoelectric energy harvester has the ability to convert rotation mechanical energy into electric power. The piezoelectric harvester with cantilever based on gravity excitation has received great attention. Given that gravity excitation is greater than conventional vibration excitation, and large mass are often used in low-frequency applications, large amplitudes pose a significant threat to the life of a harvester. In this study, a rotational energy harvester with limiters is investigated to promote practical development. This study establishes a theoretical model verified by experiments. Results show that stiffness has little influence on the limiting effect. In the experimental conditions, the output after 2000 N/m is basically the same. The peak value of the output voltage is linearly proportional to the space. Given that an impact excitation is generated in the collision, the limiter widens the frequency band of the output in the upsweep.

Research on Protection and Inheritance Strategy of Endangered Traditional Ceramic Crafts in Southern Fujian Folklore

Xiaobo Lian,Qingnian Zhang,Linping Zhou,Yuntao Huang,Zhouqing Liu KOREA INSTITUTE FOR HUMANITIES AND SOCIAL SCIENCES 2024 Journal of Arts and Cultural Studies(ACS) Vol.3 No.1

Background: In recent years, China's established many institutions and introduced reform programs to protect cultural heritage. Purpose:This research analyzes the protection status and development mode of endangered traditional ceramics in southern Fujian to better protect the endangered traditional ceramic technology in southern Fujian. It further researches ceramic process protection and inheritance development strategy. Methods: The attitudes of relevant national organizations towards protecting endangered traditional crafts are analyzed in the ceramic factory areas around Chaoshan and Foshan. The Dehua white porcelain, Jingdezhen porcelain mothers, and Foshan Shiwan dolls are compared through comparative research and literature to study various methods for protecting endangered traditional crafts. Further analyses on the strategies for the protection and development of the inheritance of endangered traditional ceramic crafts in the folklore of southern Fujian are also performed. Results: This article analyzes the protection and inheritance strategies of traditional ceramic crafts endangered in southern Fujian. It summarizes the three inheritance strategies of supporting inheritance talents, improving the protection mechanism, and establishing the protection and inheritance of traditional ceramic crafts on campus. Conclusion: The study of ceramic process protection strategy can summarize three points. First, to strengthen the precision support; second, to improve the inheritance and protection mechanism; and third, to establish research on the protection and inheritance of traditional ceramic processes.

Mating flight causes genome-wide transcriptional changes in sexually mature honeybee queens

Xiaobo Wu,ZilongWang,Fei Zhang,Yuanyuan Shi,Zhijiang Zeng 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.1

In this study, we analyzed the gene and miRNA expression differences between the courted virgin queen (CVQ) and non-courted virgin queen (NCVQ) of Apis mellifera using a high-throughput sequencing method. Through Digital Gene Expression (DGE) sequencing, 452 genes were differentially expressed, out of which, 90 genes were up-regulated and 362 genes were down-regulated in CVQ compared with NCVQ. Through small RNA sequencing, 27 miRNAs showed significant expression difference between these two samples. Moreover, 9 of the differentially expressed genes are the targets of the 11 differentially expressed miRNAs. Besides, 47 novel miRNA candidates were predicted in these two samples. Our results provided valuable information for understanding the molecular mechanism of the transition to functional queens.

Transcriptome comparison between newly emerged and sexually matured bees of Apis mellifera

Xiaobo Wu,ZilongWang,Hai-Yan Gan,Shu-Yun Li,Zhi Jiang Zeng 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.3

In order to understand the transcriptome characteristics of queens and drones of honeybee Apis mellifera, the transcriptome differences between newly emerged stage and sexually matured stage of queens and drones of A. mellifera L. were compared using high-throughput RNA-Seq. In drones, a total of 1618 DEGs were detected between the two stages. Out of these, 782 geneswere up-regulated and 836 geneswere down-regulated in sexually matured drones compared to newly emerged drones. In queens, the DEGs between the two stages were 1340, with 667 up-regulated and 673 down-regulated genes in matured queens compared to newly emerged queens. 411 genes showed the same expression trend in drones and queens during sexual maturing, with 233 (56.69%) up-regulated genes and 178 (43.31%) down-regulated at newly emerged stage. We found that genes encoding cuticular proteins (CP), cytochrome P450 (CYP), odorant binding proteins (OBP) and odorant receptor (OR), which are related to developments of bones, reproductive system and olfaction system, were differentially expressed between the sexually matured bees and the newly emerged bees. The results indicated that the expression levels of a large number of genes changed during sexual maturing of A. mellifera L. bees, which give us an insight into the characteristics of the gene expression during sexual maturing of adult queens and drones.

Ga Content and Thickness Inhomogeneity Effects on Cu(In, Ga)Se2 Solar Modules

Xiaobo Zhu,Tzu-Huan Cheng,Chee-Wee Liu 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.4

The fluctuation of Ga content and absorption layer thickness of Cu(In,Ga)Se2 (CIGS) solar modules is investigated by 3-dimensional numericalsimulation. The band gap of CIGS is increased by the increasing Gacontent, and the residual compressive strain. Strain effect worsens thedegradation of the power conversion efficiency of CIGS module in additionto Ga fluctuation. The intracell Ga fluctuation degrades the open circuitvoltage due to the minimum open circuit voltage in the parallelconfiguration, and also affects the short circuit current due to the Gadependentlight absorption. The intercell Ga fluctuation leads to a moresignificant degradation for CIGS solar module efficiency than the intracellGa fluctuation due to the additional degradation of the fill factor. Thethickness fluctuation has a small effect on open circuit voltage, but causesstrong degradation of short circuit current and fill factor, which leads to amore significant degradation on power conversion efficiency than Gafluctuation to the same fluctuation percentage. In reality, the thickness canbe tightly controlled within the fluctuation of 5% or less.

Distributed Fuzzy Extended Kalman Filter for Multiagent Systems

Xiaobo Zhang,Haoshen Lin,Gang Liu,Bing He 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.5

In this study, a novel distributed Kalman filter based on a possibilistic framework was proposed to mitigate fuzzy noisein nonlinear multiagent systems. To describe fuzzy uncertainty, noises were modeled as fuzzy random variables with trapezoidal probability distributions instead of Gaussian distributions. A fuzzy information fusion (FIF) algorithm was proposed to fuse fuzzy state estimations from neighboring nodes. The nonlinear problem was solved by using local linearization. A distributed extended fuzzy information filter was designed by combining the FIF algorithm and local linearization in distributed sensor networks. The stability of this filter was analyzed. Finally, a target tracking simulation was performed to detail the effectiveness of the proposed filter algorithm.

Luminescence Properties of Si4+-doped LiZnPO4:Eu3+ and Application in the Development of Latent Fingermarks

Xiaobo Xiong,Jiangchun Li 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.1

Si 4+ and Eu 3+ co-doped LiZnPO 4 phosphors (LZPS:Eu 3+ ) with red luminescence were prepared by high temperature solidstate reaction. The maximum photoluminescence intensity is achieved at the Eu 3+ content of 12% (molar concentration). The study also investigated the effect on luminescent properties of LiZnPO 4 :Eu 3+ by the introduction of Si 4+ into the host to substitute P 5+ . The Eu 3+ emission intensity at 592 nm and 612 nm is enhanced by 105% and 108%, respectively. Decreasing the amount of Eu 3+ signifi cantly reduces the raw material costs. The phosphor is efficiently excited under 395 nm and 254 nm ultraviolet radiation, and is used as the red component in white light-emitting diodes (WLEDs) or fluorescent lamps. The excitation spectra consist of a broad band extending 200–280 nm and a series of sharp peaks extending 310–500 nm, centered at 395 nm, which corresponds to the charge transfer band of O 2− → Eu 3+ and the f → f transition of Eu 3+ , respectively. The study applies this distinctly bright phosphor in the detection and imaging of lipid fingermarks on common non-porous and semi-porous substrates such as colored paper, glass, porcelain, and leather, etc. All results indicate that the LZPS:Eu 3+ phosphor is an ideal detection powder for background interference reduction due to its high fluorescence brightness which offers high contrast images, which is applicable to the development of fi ngermarks on the common non-porous and semiporous substrates.

South Korea`s Rise in Comparative Perspective

( Xiaobo Hu ),( Michael A. Morris ) 경남대학교 극동문제연구소 2017 ASIAN PERSPECTIVE Vol.41 No.1