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2003-2018 全部
为您找到包含“National Natural Science Foundation of China”的内容共1306

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)

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 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)

Liu Zhibin,Liu Daojie

In this paper, the simulation models of constant-volume closed overpressure gas reservoirs and water drive overpressure gas reservoirs were constructed basing on the pressure drop equations and the productivity equations, according to the features of overpressure gas wells and reservoirs. With these models, the pressure distributions of static fluid and flowing fluid in borehole were calculated respectively. The pressure distribution in borehole and formation of overpressure gas wells was simulated with computer and mathematical model techniques, through which the distortion and the variation process with pressure drop of reservoir rocks and overpressure gas well pressure, temperature, outflow, flow pattern etc. were both vividly described. The software, \"Production Simulation System for Overpressure Gas Wells\", was designed, which laid a foundation of the optimal control for single overpressure gas well and offered a more efficient method for the description of the production performance of overpressure gas reservoirs.

2010-05-27

National Natural Science Foundation of China(No.50874094

School of Sciences, Southwest Petroleum University, Chengdu 610500,Graduate School, Southwest Petroleum University, Chengdu 610500,

#Mine Engineering and Technology#

0评论(0 分享(0)

Liang Gang,Tong Minchao,Tao Haiyan,Wang Chunjiang

In this paper, the direct asymmetric Mannich reaction of glycine Schiff base with N-tosyl imines has been developed with Cu(CH3CN)4BF4/TF-BiphamPhos complex. This catalytic system performances well over abroad scope of substrates, furnishing anti-adducts of various a-diamino acid esters in good yields with up to 94:6 diastereoselectivity and 97% enantioselectivity.

2010-08-09

SRFDP(20090141110042

National Natural Science Foundation of China (20642005

Wuhan University, College of Chemistry and Molecular Sciences,Wuhan University, College of Chemistry and Molecular Sciences,Wuhan University, College of Chemistry and Molecular Sciences,Wuhan University, College of Chemistry and Molecular Sciences

#Chemistry#

0评论(0 分享(0)

ZHENG Dongmei,ZHOU Jigen,LI Bing,LIU Changsong

Zinc oxide (ZnO) nanostructured surfaces can be reversibly altered from hydrophobicity to hydrophilicity in response to ultraviolet light or plasma treatment. In this paper, a thermal annealing procedure was used to tune ZnO nanowires' surface wettability, and switchable and reversible wettability was achieved. ZnO nanowires were synthesized by a simple solution method. The surfaces of as-synthesized ZnO nanowires demonstrate a superhydrophobicity with water contact angle of 151 degree at room temperature. After a high temperature treatment (>300 degree C) for 30 minutes, their superhydrophobicity was transited to superhydrophilicity with water contact angle of < 10 degree. In addition, the properties of switchable wettability can be archived very shortly (less than half minutes) when the treatment temperature is more than 400 degree C. Also, the high-thermal annealed superhydrophilic ZnO surfaces can be recovered to superhydrophobicity after a low-temperature (~100 degree degree C) procedure for sevreal hours. Thus, the tunable properties of ZnO surface energy result in reversibly switchable wettability between superhydrophobicity and superhydrophilicity. This tunable wettability can be explained based on ZnO as a semiconductor material, which provides different numbers of oxygen vacancies under different temperatures. This result will extend applications of ZnO nanomaterials to many important fields, such as microfluidic devices, chemical sensors and biosensors.

2010-09-21

National Natural Science Foundation of China (No. 50702029)

School of Mechnical Engineering, Qingdao Technological University, Qingdao 266033,School of Mechnical Engineering, Qingdao Technological University, Qingdao 266033,School of Mechnical Engineering, Qingdao Technological University, Qingdao 266033,School of Mechnical Engineering, Qingdao Technological University, Qingdao 266033

#Materials Science#

0评论(0 分享(0)

YANG Ting,SUN Yugeng,YAN Yanhan,CAO Zhiheng,ZHANG Qianqian

Wireless self-organized sensor network is a data-centre network, and data's validity is firstly important. Using source initiated on demand routing technology, the paper presents a novel routing algorithm to fast configuring routing path, which can decrease the delay and increase success rate in data transmitting. All of these will achieve data's validity and efficiently improve the transmitting performance, in which the sensor network's live-cycle increases 12.9%, the number of control packets are decresed 61.1% and the configuring time are decreased 31.8%. Finally, validity and robustness are proved with computer experiments.

2010-09-29

National Natural Science Foundation of China (No.60702037)

School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

Liu Ning,Guo Lei,Ma Wen-Gan,Zhang Ren-You,Han Liang

We investigate the NLO QCD and the CP-violation effects in t\bar{t}Z^0 production at the Large Hadron Collider(LHC) in the minimal supersymmetric standard model(MSSM). Our calculation shows that the total NLO QCD correction in the framework of the CP-conserving MSSM significantly improves the scale uncertainty at the leading order, and the contribution from the pure supersymmetric QCD (pSQCD) correction can exceed $-8%$ with the restrictions of $90~GeV < p_T^t < 120~GeV$ and $120~GeV < p_T^Z < 150~GeV$, where $p_T^t$ and $p_T^Z$ are the transverse momenta of the top-quark and $Z^0$ gauge boson, respectively. Our numerical results demonstrate that the pure supersymmetric QCD correction generally suppresses the total SM-like QCD correction in the CP-conserving MSSM, and tends to be a constant when either $ ilde{t}_1$ or $ ilde{g}$ is heavy enough. We find also that the CP-odd asymmetry ${cal A}_{Phi}$ can reach $2.17 imes 10^{-3}$, if the CP-phase angle really exists in the coupling of gluino-stop-top.

2010-10-08

the National Natural Science Foundation of China(No.10875112

Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, Anhui 230026, P.R.China,Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, Anhui 230026, P.R.China,Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, Anhui 230026, P.R.China,Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, Anhui 230026, P.R.China,Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, Anhui 230026, P.R.China

#Physics#

0评论(0 分享(0)

Guiqiu Chen,Yun Chen,Guangming Zeng,Anwei Chen,Wenjuan Zhang

The study was designed to assess changes of microbial biomass and enzyme activities between compost and cadmium-polluted compost applied to red soil. Results showed that soil microbial biomass C and P, activities of catalase, dehydrogenase, and acid phosphatase decrease in all treatments during the incubation time. Cd-polluted compost has an inhibitory effect on microbial biomass P and acid phosphatase activity than compost in control at the same sampling time. Microbial biomass C is activated by 0.26-98.46% in soils of <27.8 mg/kg Cd treatment than that of control. Catalase activity is stimulated by 0.17-4.49% in treatments with <12.8 mg/kg Cd. Dehydrogenase activity in treatment of 8.8 mg/kg Cd increases by 1.6-16.1% than that of control. Urease activity increases by 0.56-65.90% with an increase of Cd in compost with <17.8 mg/kg Cd. But in treatments with >27.8 mg/kg Cd, the urease activity is inhibited by 0.81-2.65% at Day 20. These results suggest that <27.8 mg/kg Cd-contaminated compost have activation impacts on soil microbial biomass C, urease, catalase, and dehydrogenase activity.

2010-10-04

National Natural Science Foundation of China (50908078)

College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China, Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China ,College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China, Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China ,College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China

#Environmental Science and Techology#

0评论(0 分享(0)

WEI Shaowen,LIU Yuxiao

Using the new physical interpretation of quasinormal modes proposed by Maggiore, we calculate the area and entropy spectra for the 3-dimensional and 5-dimensional large Ads black hole. The spectra are obtained by imposing the Bohr-Sommerfeld quantization condition and the adiabatic invariant quantity. With this semiclassical method, we find that the spacings of the area and entropy spectra aare equidistant and independent of the Ads radius of the black hole for both the casess. However, the spacings of the spectra are not the same for different dimension of space-time. The equidistant area spectra will be broken when the black hole has other paprameters (i.e., charge and angular momentum) of in a non-Einstein's gravity theory.

2010-11-18

the National Natural Science Foundation of China (No. 10705013)

Institute of Theoretical Physics, Lanzhou University,Institute of Theoretical Physics, Lanzhou University

#Physics#

0评论(0 分享(0)