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Search Results: 1 - 10 of 80675 matches for " Liu Guangfeng "
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Mono-dispersed Functional Polymeric Nanocapsules with Multi-lacuna via Soapless Microemulsion Polymerization with Spindle-like α-Fe2O3Nanoparticles as Templates
Liu Guangfeng,Liu Peng
Nanoscale Research Letters , 2009,
Abstract: The mono-dispersed crosslinked polymeric multi-lacuna nanocapsules (CP(St–OA) nanocapsules) about 40 nm with carboxylic groups on their inner and outer surfaces were fabricated in the present work. The small conglomerations of the oleic acid modified spindle-like α-Fe2O3nanoparticles (OA–Fe2O3) were encapsulated in the facile microemulsion polymerization with styrene (St) as monomer and divinyl benzene (DVB) as crosslinker. Then the templates, small conglomerations of OA–Fe2O3, were etched with HCl in tetrahydrofuran (THF). The surface carboxylic groups of the crosslinked polymeric multi-lacuna nanocapsules were validated by the Zeta potential analysis.
Detective Method for Water Pollution Based on Millimeter Wave Radiant Characteristics  [PDF]
Beibei Li, Guangfeng Zhang, Guowei Lou, Luyan Zhou, Jing Liu
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.43013
Abstract:

Aim at monitoring water pollution, especially the aquatic vegetation, the multilayer dielectric model based on incoherent method is established to analysis the brightness temperature of aquatic vegetation. A 3 mm radiometer is used to measure the radiant characteristics of water pollution. Compared to 3 layer dielectric model, the simulation result of multilayer dielectric model is in better accordance with the experimental data, which shows that the multilayer dielectric model can model aquatic vegetation’s radiant characteristics more precisely. This result shows that water has millimeter wave radiant characteristics of low brightness temperature, cold target compared to aquatic vegetation. Based on the study of water’s brightness temperatures and aquatic vegetation’s radiant characteristics, the radiant characteristics can be used to monitor aquatic vegetation.

An evidence for the strong association of N-methyl-2-pyrrolidinone with some organic species in three Chinese bituminous coals
ChanMin Liu,ZhiMin Zong,JiXian Jia,GuangFeng Liu,XianYong Wei
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-007-0509-1
Abstract: Three Chinese bituminous coals collected from Shenfu, Heidaigou and Feicheng coal fields were respectively extracted with carbon-disulfide/N-methyl-2-pyrrolidinone (CS2/NMP) mixed solvent (volume ratio 1:1) at room temperature followed by distillation of CS2 under ambient pressure and subsequent removal of most of NMP by distillation at 110°C under reduced pressure to afford mixed solvent-extractable fractions (MSEFs) with small amount of NMP. Acetone-extractable fraction 1 (AEF1) was obtained by extracting each MSEF under ultrasonic irradiation at room temperature and subsequently using a Soxhlet extractor. Direct extraction of each bituminous coal affords acetone-soluble fraction 2 (AEF2). GC/MS analysis shows that m/z of base or secondary peak in mass spectra of a series of components from each AEF1 is 98, whereas such components were not detected in AEF2. Since m/z of base peak in mass spectrum of NMP itself is 99, the base or secondary peak at m/z 98 should result from loss of α-H from NMP, i.e., NMP is strongly associated with some organic species (OSs) and thereby the components detected with base or secondary peak at m/z 98 in their mass spectra should be associated NMP-OS.
A formula for Euler characteristic of line singularities on singular spaces
Guangfeng Jiang
Mathematics , 2000,
Abstract: We prove an algebraic formula for the Euler characteristic of the Milnor fibres of functions with critical locus a smooth curve on a space which is a weighted homogeneous complete intersection with isolated singularity.
Conormal modules via Primitive ideals
Guangfeng Jiang
Mathematics , 2000,
Abstract: The main object of this note is to study the conormal module $M$ and the computation of the second symbolic power $\bar I^{(2)}$ of an ideal $\bar I$ in the residue ring $R/H$ of a polynomial ring $R$ over a field of characteristic zero. The torsion part $T(M)$ of $M$ and the torsion free module $M/T(M)$ are expressed by the primitive ideal of $I$ relative to $H$. Two characterizations for $M/T(M)$ to be free are proved. Some immediate applications are worked out.
An evidence for the strong association of N-methyl-2-pyrrolidinone with some organic species in three Chinese bituminous coals

LIU ChanMin,ZONG ZhiMin,JIA JiXian,LIU GuangFeng,WEI XianYong,

科学通报(英文版) , 2008,
Abstract: Three Chinese bituminous coals collected from Shenfu, Heidaigou and Feicheng coal fields were respectively extracted with carbon-disulfide/N-methyl-2-pyrrolidinone (CS2/NMP) mixed solvent (volume ratio 1:1) at room temperature followed by distillation of CS2 under ambient pressure and subsequent removal of most of NMP by distillation at 110°C under reduced pressure to afford mixed solvent-extractable fractions (MSEFs) with small amount of NMP. Acetone-extractable fraction 1 (AEF1) was obtained by extracting each MSEF under ultrasonic irradiation at room temperature and subsequently using a Soxhlet extractor. Direct extraction of each bituminous coal affords acetone-soluble fraction 2 (AEF2). GC/MS analysis shows that m/z of base or secondary peak in mass spectra of a series of components from each AEF1 is 98, whereas such components were not detected in AEF2. Since m/z of base peak in mass spectrum of NMP itself is 99, the base or secondary peak at m/z 98 should result from loss of α-H from NMP, i.e., NMP is strongly associated with some organic species (OSs) and thereby the components detected with base or secondary peak at m/z 98 in their mass spectra should be associated NMP-OS. Supported by the National Natural Science Foundation of China (Grant Nos. 90410018, 90510008 and 10432060), the Key Project of Chinese Ministry of Education (Grant No. 104031) and the Program of the Universities in Jiangsu Province for Development of High-Tech Industries (Grant No. JHB05-33)
Mesenchymal Stem Cells Ameliorate Th1-Induced Pre-Eclampsia-Like Symptoms in Mice via the Suppression of TNF-α Expression
Liu Liu, Guangfeng Zhao, Hongye Fan, Xiaoyin Zhao, Pengfei Li, Zhiqun Wang, Yali Hu, Yayi Hou
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0088036
Abstract: Pre-eclampsia (PE) is thought to be a pregnancy-induced autoimmune disease. Despite several strategies carried out for targeting specific factors relevant to its pathogenesis, PE remains potentially fatal to some patients. Here, we reported a way to isolate mesenchymal stem cells (MSCs) from decidua. The MSCs not only exhibited differentiation and self-renewal capacities, they also possessed immunomodulatory functions and secreted some soluble mediators including IL-6, TGF-β, IDO, VEGF and COX-2. Most importantly, the MSCs were specifically provided with the ability to suppress T cells proliferation by IDO in response to inflammatory cytokine IFN-γ. Moreover, we developed a Th1 cell-induced PE mouse model which displayed a high level of pathogenesis factor TNF-α. Strikingly, MSCs-based therapy significantly ameliorated both clinical and histopathological severity of PE symptoms including decreasing the blood pressure and proteinuria, suppressing glomerulonephritis, protecting the feto-placental development. The therapy also reversed abnormal TNF-α expression in uterine and splenic lymphocytes. These data suggest that MSCs may ameliorate Th1-induced PE-like symptoms in mice via the suppression of TNF-α and MSCs-based therapy may provide a potential novel method for PE.
Traumatic experiences and mental health consequences among child survivors of the 2008 Sichuan earthquake: a community-based follow-up study
Zhaobao Jia, Lizheng Shi, Guangfeng Duan, Weizhi Liu, Xiao Pan, Yingyao Chen, Wenhua Tian
BMC Public Health , 2013, DOI: 10.1186/1471-2458-13-104
Abstract: Using the method of multistage systematic sampling, 596 children aged between 8 and 16?years were randomly selected from severely affected areas of the earthquake. These children were interviewed with standardized instruments of posttraumatic stress disorder (PTSD) and depression at the 15th month after the earthquake, and re-interviewed at the 36th month.From the initial to the follow-up assessments, there were no significant changes in both PTSD and depression scores. In addition, no significant change was found on the overall prevalence rates of the symptoms: from 12.4% to 10.7% for PTSD, from 13.9% to 13.5% for depression, and from 4.2% to 4.7% for their co-occurrence. The study also indicated that the earthquake might have a delayed impact on the psychosocial functioning of children and adolescents who were not directly affected by the disaster.For child and adolescent survivors of the earthquake, symptoms of PTSD and depression seemed to persist over time. The finding that children reduced their use of mental health services raised great concerns over how to fulfill the unmet psychological needs of these children. More mental health interventions should be allocated to children who had elevated risk for developing persistent course of the symptoms.Over the past decade, Asia has been the continent frequently and severely affected by earthquakes [1]. From the 225,000 deaths caused by the 2004 Indian Ocean earthquake and tsunami [2], to 73,276 deaths by the 2005 Pakistan earthquake [3], 69,200 deaths by the 2008 China Sichuan earthquake [4], and 15,839 deaths by the 2011 Great East Japan earthquake [5], Asian countries suffered not only giant losses from the instantaneous and devastating blow of the disaster, but critical consequences from the longstanding post-earthquake adversities, e.g., the dysfunction of public health systems. As an essential component of public health, continuing attention should be paid to the mental health of the survivors because psychol
New well-posed model and classified diffusion
新适定模型的提出及分类扩散

Li Yanbao,Jiang Guangfeng,Wang Zhiqiang,Liu Wei,
李彦宝
,姜广峰,王治强,刘薇

中国图象图形学报 , 2012,
Abstract: 提出一种新的适定滤波模型和一个可以滤除混合噪声的滤波方法。分析并讨论Perona和Malik (PM)模型中的传导系数函数,该函数对边缘的敏感性较强,是PM模型为不适定方程的主要原因。修改传导系数函数的敏感性后,得到适定的各向异性图像扩散模型,具备不适定模型所不具有的双扩散项和扩散因子的形式。根据滤波方程特点将模型分为平滑模块和抑噪模块,分离了平滑和抑噪两个物理过程,从而提升了图像的光滑性和降低了图像的噪声。在实际图像上的实验结果表明,新的滤波算法对混合噪声的滤波效果优于一些经典的图像扩散算法。
Measurement Model on Human Capital Cost of Enterprise
guangfeng Ye,xia Zhou
International Business and Management , 2012, DOI: 10.3968/j.ibm.1923842820120502.z0961
Abstract: This study of human capital of enterprises and human capital cost receives more and more attention from both the academic and business circles. But still there lacks mature methods to measure human capital cost. Based on relevant research results on human capital, the paper provided on how to calculate the human capital investment, how to control the amount of investment and how to optimize the investment structure. key words: Human capital cost; Measurement model
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