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2003-2018 全部
为您找到包含“National Natural Science Foundation of China”的内容共1331

ZHAO Yang,LIU Xiangdong

Two commercially available amines, octanediamine (ODM) and m-xylylenediamine (MXDM), were chosen to tough polybenzoxazine resin due to their controllable capability to cause phase separation during the copolymerization with benzoxazine monomers. The toughing behavior and phase separation of the cured resins were investigated using tensile tests and analyses of DMA, SEM, and TGA-GC/MS. The resulting networks showed remarkable toughness without obvious degradation in thermo-mechanical performance. Especially, when ODM/MXDM molar ratio was 1:1, an elongation rate of 10.55% and a breaking strength of 82.67 Mpa, which are 86% and 128% higher than that of the neat benzoxazine resin, respectively, were achieved. These findings open a new way to improve toughness of brittle polybenzoxazine resins.

2017-11-16

National Natural Science Foundation of China (51573167)

National Natural Science Foundation of China (51573167)

National Natural Science Foundation of China (51573167)

National Natural Science Foundation of China (51573167

National Natural Science Foundation of China (51573167

Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018,Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018

#Materials Science#

0评论(0 分享(0)

LI Lei,YU Jia

In recent years, the multi-document summary technology has gotten more and more attention in the field of natural language processing. However, the relationship between the topics and the level information are rarely considered, and sentence scoring is also a very important and difficult task in the multi-document summary process. The results of hLDA (hierarchical Latent Dirichlet Allocation) in the hierarchical topic modeling have been widely validated. Therefore this paper focused on the nodes in the hLDA model, researched the hLDA and semantic based sentence scoring method and presented seven algorithms to provide a strong basis for the multi-document summary.

2013-10-29

National Natural Science Foundation of China (No.61202247

National Natural Science Foundation of China (No.71231002

School of Computer Science, Beijing University of Posts and Telecommunications, 100876,School of Computer Science, Beijing University of Posts and Telecommunications, 100876

#Computer Science and Technology#

0评论(0 分享(0)

Lu Yinfeng,Zhang Xiaohong

As a generalization of BCI-algebras with condition (S) and pseudo-BCK algebras with condition (pP), the notion of pseudo-BCI algebras with condition (pP) is introduced. An example of pseudo-BCI algebras with condition (pP) is given, the result that every anti-grouped pseudo-BCI algebras is with condition (pP) is proved. Some properties of pseudo-BCI algebras with condition (pP) are investigated and the branch properties of pseudo-BCI algebras with condition (pP) are discussed.

2010-10-09

Ningbo National Natural Science Foundation of China(Grant No. 2009A610078

National Natural Science Foundation of China (Grant No. 60775038

Faculty of Sciences, Ningbo University,Faculty of Sciences, Ningbo University

#Mathematics#

0评论(0 分享(0)

LI Zhi-Yong,LIN Ke

Maintaining a good balance between convergence and diversity is particularly crucial to the performance of the evolutionary algorithms (EAs). However, traditional multi-objective evolutionary algorithms, which have demonstrated their competitive performance in a variety of practical problems involving two or three objectives, face significant challenges in many-objective optimization problems (MaOPs). This paper proposes a dynamic convergence-diversity guided evolutionary algorithm (DCDG-EA) for MaOPs by employing decomposition technique. The objective space of MaOPs is divided into $K$ subspaces by a set of uniformly distributed reference vectors. Each subspace has its own subpopulation and evolves in parallel with the other subspaces. In DCDG-EA, the balance between convergence and diversity is achieved through convergence-diversity based operator selection (CDOS) strategy and convergence-diversity based individual selection (CDIS) strategy. In CDOS, each operator in a set of operators is assigned a selection probability which is related to its convergence and diversity reward. On the basis of selection probability, an appropriate operator is selected to generate offspring. Furthermore, CDIS greatly overcomes the inefficiency of Pareto dominance. It updates each subpopulation by using two independent distance measures that respectively represent convergence and control diversity. The experimental results on DTLZ benchmark problems with up to 15 objectives show that our algorithm is highly competitive in comparison with the selected four state-of-the-art evolutionary algorithms in terms of convergence and diversity.

2018-04-16

The National Natural Science Foundation of China (No.61672215

The National Natural Science Foundation of China (U1613209

College of Computer Science and Electronic Engineering of Hunan University, and Key Laboratory for Embedded and Network Computing of Hunan Province, Changsha 410082,College of Computer Science and Electronic Engineering of Hunan University, and Key Laboratory for Embedded and Network Computing of Hunan Province, Changsha 410082

#Computer Science and Technology#

0评论(0 分享(0)

LI Zhi-Yong,Chen Li

Correlation filter (CF) based trackers have become quite popular in video tracking because of their impressive performance and high frame rates. A large amount of recent research focuses on the improvement of training model of correlation filter to get a tracker with better discriminative power. However, this only helps the tracker to discriminate the target object from background within a small neighborhood, which is not suitable for fast motion scenes. In this paper, we propose a new detection model to dig out the potential of the correlation filter to deal with the challenge of fast motion. The model performs detection operations on multiple small search areas within a large one. Thus, our tracker can accurately localize the target object in a larger search area. In addition, we also added space constraints to boost the tracking performance of the model. The extensive experimental results demonstrate that the proposed tracker outperforms several state-of-the-art trackers on the challenging benchmark dataset with 51 sequences.

2018-05-02

The National Natural Science Foundation of China (61672215

The National Natural Science Foundation of China (U1613209

College of Computer Science and Electronic Engineering of Hunan University, and Key Laboratory for Embedded and Network Computing of Hunan Province, Changsha 410082,College of Computer Science and Electronic Engineering of Hunan University, and Key Laboratory for Embedded and Network Computing of Hunan Province, Changsha 410082

#Information Science and System Science#

0评论(0 分享(0)

ZENG Fan-Zi,LI Qiao,LI Qiao

We investigate the problem of cross-tier interference control in full-duplex (FD) Orthogonal Frequency Division Multiple Access (OFDMA) based heterogeneous networks (HetNets) consisting of macrocell and underlaying femtocells. A price mechanism is introduced where the macro base station (MBS) and femtocell base stations (FBSs) all aim to maximize their own utility function considering finite interference constraint. We propose a triple optimization strategy of power control, subcarrier allocation and price regulation which can solve the cross-tier interference optimization problem of femtocell to macrocell. We analyze the superiority of the barrier method for the utility function of the macrocell, and to a certain extent, it has a better convergence. Through the experiment, we can see that the proposed the triple resource allocation algorithm can effectively suppress cross-tier interference and maximize the utility of macrocell and femtocells.

2018-05-03

The National Natural Science Foundation of China (No.61672215

The National Natural Science Foundation of China (U1613209

College of Computer Science and Electronic Engineering of Hunan University, and Key Laboratory for Embedded and Network Computing of Hunan Province, Changsha 410082,College of Computer Science and Electronic Engineering of Hunan University, and Key Laboratory for Embedded and Network Computing of Hunan Province, Changsha 410082,College of Computer Science and Electronic Engineering of Hunan University, and Key Laboratory for Embedded and Network Computing of Hunan Province, Changsha 410082

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

Jiayu Gu,Bingyong Mao,Shumao Cui,Jianxin Zhao,Hao Zhang,Wei Chen

Fructooligosaccharides (FOS) are a well-known class of prebiotic and are considered to selectively stimulate the growth of bifidobacteria in the gut. Previous studies focused on the stimulated growth of Bifidobacterium, but did not further investigate the bifidobacterial composition, i.e. the specific species that was were stimulated. In this study mice were fed with FOS in different doses (0%, 5%, and 25%) for 4 weeks and the composition of fecal microbiota, in particular Bifidobacterium, was analyzed by sequencing the V3-V4 region and the groEL gene on the MiSeq platform, respectively. In the high-dose group (25% FOS) the relative abundance of Actinobacteria was significantly increased, which was mainly contributed by Bifidobacterium. At the genus level the relative abundances of Blautia and Coprococcus were also significantly increased. Through the groEL sequencing 14 species of Bifidobacterium were identified, among which Bifidobacterium pseudolongum (B. pseudolongum) was most abundant. After FOS treatment, B. pseudolongum became almost the sole bifidobacterial species (>95%). We isolated the B. pseudolongum strains and, by high performance liquid chromatography (HPLC), demonstrated their ability to metabolize FOS. Therefore, we concluded that FOS significantly stimulated the growth of B. pseudolongum in mice. Further investigations are needed to reveal the mechanism of selectiveness between FOS and B. pseudolongum, which would aid our understanding of the basic principles of dietary carbohydrates and host health.

2018-03-15

The Youth Program of National Natural Science Foundation of China (No.31601453

The Key Program of National Natural Science Foundation of China (No.31530056

The General Program of National Natural Science Foundation of China (No.31471721)

The Youth Program of National Natural Science Foundation of China (31601453

The Key Program of National Natural Science Foundation of China (31530056

The General Program of National Natural Science Foundation of China (31471721

School of Food Science and Technology, Jiangan University, Wuxi 214122,School of Food Science and Technology, Jiangan University, Wuxi 214122,School of Food Science and Technology, Jiangan University, Wuxi 214122,School of Food Science and Technology, Jiangan University, Wuxi 214122,School of Food Science and Technology, Jiangan University, Wuxi 214122,School of Food Science and Technology, Jiangan University, Wuxi 214122

#Food Science and Technology#

0评论(0 分享(0)

BI Qingyuan,LIN Jiandong,JIANG Tao,LI Yiyang,LIU Yongmei,HE Heyong,CAO Yong

It is highly desirable to develop an efficient heterogeneous catalyst for selective formic acid (FA) decomposition for ultraclean H2 gas in the absence of any organic/inorganic alkalis or extra additives under mild conditions. Au/ZrO2 has been proven to be a robust and efficient catalyst for FA dehydrogenation. Yet, there is a lack of understanding of the crystallite phase effect of ZrO2 for supporting active Au in target process. We report here ZrO2 with different polymorphs supported Au nanoparticles (NPs) can achieve near completion of FA dehydrogenation at 80 oC, and Au/m-ZrO2 catalyst with the largest amount of surface basic sites exhibited the highest catalytic activity. Basic sites in Au catalyst surface can substantially facilitate crucial FA deprotonation process in base-free aqueous medium which appears to be a key factor for achieving high dehydrogenation performance.

2015-06-24

National Natural Science Foundation of China (21273044

Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433,Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433,Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433,Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433,Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433,Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433,Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433

#Chemistry#

0评论(0 分享(0)

ZHU Chunhui,LI Hongbo,WANG Shaolan,WANG Baoying,HU Chenghu,DU Fangying,ZHAO Panpan,LI Ang,YU Xiaorui

Human age-related retinal diseases, such as age-related macular degeneration (AMD), are intimately associated with decreased tissue oxygenation and hypoxia. Different antioxidants have been investigated to reverse AMD. In the present study, we describe the antioxidant 17β-estradiol (βE2) and investigate its protective effects on retinal neurons. Fourteen days after ovariectomy, adult Sprague-Dawley rats were exposed to 8000-lux light for 12 h to induce retinal degeneration. Reactive oxygen species (ROS) levels were assessed by confocal fluorescence microscopy using 2, 7-dichlorofluorescein diacetate. Nuclear factor erythroid 2-related factor 2 (Nrf2) and antioxidant enzyme mRNA expression were detected by real-time PCR. Western blotting was used to evaluate NRF2 activation. NRF2 translocation was determined by immunohistochemistry, with morphological changes monitored by hematoxylin and eosin staining. Following light exposure, βE2 significantly reduced ROS production. βE2 also up-regulated NRF2 mRNA and protein levels, with maximal expression at 4 and 12h post-exposure, respectively. Interestingly, following βE2 administration, NRF2 was translocated from the cytoplasm to the nucleus, primarily in the outer nuclear layer. βE2 also up-regulated NRF2, which triggered phase-2 antioxidant enzyme expression (superoxide dismutases 1 and 2, catalase, glutaredoxins 1 and 2, and thioredoxins 1 and 2), reduced ROS production, and ameliorated retinal damage. However, the beneficial effects of βE2 were markedly suppressed by pretreatment with LY294002 or ICI182780, specific inhibitors of the phosphotidylinositol 3-kinase-Akt (PI3K/AKT), and estrogen receptor (ER) signaling pathways, respectively. Taken together, these observations suggest that βE2 exerts antioxidative effects following light-induced retinal degeneration potentially via NRF2 activation. This protective mechanism may depend on two pathways: a rapid, non-genomic-type PI3K/AKT response, and a genomic-type ER-dependent response. Our data provides evidence that βE2 is potentially effective for treatment of retinal degeneration diseases.

2015-06-24

The National Natural Science Foundation of China (no.30672286 and no. 81271013) and the National Research Foundation for the Doctoral Program of Higher Education of china

Department of Genetics and Molecular Biology, School of Medicine, Xi’an Jiaotong University, Xi’an 710061, China,Department of Periodontology for Stomatology, Stomatological Hospital, School of Medicine, Xi’an Jiaotong University, Xi’an 710004, China,Department of Genetics and Molecular Biology, School of Medicine, Xi’an Jiaotong University, Xi’an 710061, China,Department of Genetics and Molecular Biology, School of Medicine, Xi’an Jiaotong University, Xi’an 710061, China,Department of Genetics and Molecular Biology, School of Medicine, Xi’an Jiaotong University, Xi’an 710061, China,Department of Genetics and Molecular Biology, School of Medicine, Xi’an Jiaotong University, Xi’an 710061, China,Department of Genetics and Molecular Biology, School of Medicine, Xi’an Jiaotong University, Xi’an 710061, China,Department of Genetics and Molecular Biology, School of Medicine, Xi’an Jiaotong University, Xi’an 710061, China,Department of Periodontology for Stomatology, Stomatological Ho

#Basic Medicine#

1评论(0 分享(0)

JIANG Xiaodong,LEI Li,HU Qiwei,GAO Shangpan,TAN Lijie,ZHANG Leilei

Well-crystallized plate-like Re3N crystals were synthesized through a high-pressure solid-state metathesis (HPSSM) reaction. The vibrational properties of Re3N crystals were studied by the temperature dependence of Raman spectroscopy between 77 K and 873K. With the temperature increasing, the red-shift and broadening of Raman bands of Re3N could be well fitted using a model involving three- and four-phonon decay processes. Our fitting results indicated that the three-phonon decay processes were dominant over the four-phonon ones at high temperatures.

2015-07-17

The National Natural Science Foundation of China (21301122

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065,Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065,Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065,Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065,Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065,Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065

#Materials Science#

0评论(0 分享(0)