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Search Results: 1 - 10 of 78395 matches for " Yanfang Chen "
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Study on the Risk Evaluation of Government Purchasing Public Service Based on Matter Element Extension Model  [PDF]
Yanfang Chen
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.62012
Abstract:
The government purchase public service has the dual effect of performance and risk, and risk management should run through the purchase service. By identifying the key influencing factors, this paper constructs the risk evaluation index system of government purchasing public services, and introduces the matter element extension method to quantify all kinds of risks. The empirical test is based on the sample data of S province. The results show that the risk level of government purchase of public service is “high” and the trend of “medium” level is obvious. The institutional arrangement leads to a “higher” social risk, management risk and economic risk. It is mainly related to the factors such as voluntary failure, internal effect, social trust, power capital, information disclosure, rules and regulations, and management process. Based on this, this paper puts forward the corresponding policy recommendations.
Design and Development of High School Artificial Intelligence Textbook Based on Computational Thinking  [PDF]
Yanfang Yu, Yuan Chen
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104898
Abstract:
Big data and deep learning technology have once again set off a boom in artificial intelligence. Artificial intelligence has been a major development strategy in many countries. The Chinese government has also written this into the “13th Five-Year Plan”, and the Ministry of Education has also launched with the reform measures for artificial intelligence education, the deep integration of “artificial intelligence education” has been opened. In this context, China’s artificial intelligence disciplines and professional construction have set off a major reform storm from colleges to basic education. The revision of this high school artificial intelligence textbook was carried out in this context. The biggest feature of this high school artificial intelligence textbook revision is the integration of computational thinking into the core literacy design. Computational thinking is an indispensable ability of learners in the 21st century. As a typical “digital aboriginal”, high school students must have computational thinking in order to cope with the challenges brought about by the rapid changes in social technology in the future. At present, all developed countries have incorporated computational thinking into national curriculum standards. China has also written computational thinking into national curriculum standards and listed it as one of the core literacies of information technology disciplines.
Does Education Improve Intergenerational Income Mobility?  [PDF]
Yanfang Liao
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.75006
Abstract: When the whole people enter a well-off society, the income gap between residents and the solidification of social strata remain the focus of government and society. The improvement of intergenerational income mobility can improve the internal structure of income distribution and promote social stratum mobility to a certain extent. As the saying goes, “knowledge changes fate”, but there are also “poor families can hardly give birth to noble children”. Then, whether the improvement of education level can help individuals to move upwards, weaken the influence of family economic status on their income, and improve intergenerational mobility? This paper uses household income distribution survey, estimates intergenerational income elasticity with double samples, and uses Intersection item to analyze the effect of education level on intergenerational income elasticity in the model. The empirical results show that the increase of educational years can improve intergenerational income mobility, and the effect is better in rural areas. Therefore, the government should promote education fairness, protect children’s equal right to education, especially low-income families, guide them in the concept of education, continue the development of compulsory education, and improve the funding system of higher education.
Semilocal Convergence for a Fifth-Order Newton's Method Using Recurrence Relations in Banach Spaces
Liang Chen,Chuanqing Gu,Yanfang Ma
Journal of Applied Mathematics , 2011, DOI: 10.1155/2011/786306
Abstract: We study a modified Newton's method with fifth-order convergence for nonlinear equations in Banach spaces. We make an attempt to establish the semilocal convergence of this method by using recurrence relations. The recurrence relations for the method are derived, and then an existence-uniqueness theorem is given to establish the R-order of the method to be five and a priori error bounds. Finally, a numerical application is presented to demonstrate our approach.
Study on animated magnetic chitosan micropheres immobilized Candida tropicalis used to treat phenol wastewater
胺基化磁性壳聚糖微球固定化Candida tropicalis处理含酚废水研究

Wei Yanfang,Chen Sheng,
魏燕芳
,陈盛

环境工程学报 , 2008,
Abstract: 通过戊二醛将Candida tropicalis固定在胺基化磁性壳聚糖微球(NH2-M-CSm)上,探讨了游离Ct、磁性壳聚糖微球(M-CSm)固定化Ct和NH2-M-CSm固定化Ct除酚的最适条件。结果表明,游离Ct最适pH为5.5,M-CSm和NH2-M-CSm固定化Ct均在4~6之间;游离Ct最适温度为35℃,M-CSm和NH2-M-CSm固定化Ct均为30℃;NH2-M-CSm固定化Ct的热稳定性>M-CSm固定化Ct>游离Ct;离子强度对固定化Ct无影响,而对游离Ct有一定的影响;一价态离子对游离Ct和固定化Ct影响不大;二价态离子对游离Ct起抑制作用,而对固定化Ct起促进作用;三价态离子对游离Ct和固定化Ct均起抑制作用。通过实验还得知,固定化Ct可以通过再培养恢复酶活力,其半衰期至少为90 d。最后,在实际废水处理中,经3 h反应后,NH2-M-CSm固定化Ct除酚几乎达100%,而游离Ct只达到80%左右。
1,3-Dibenzyloxy-5-(bromomethyl)benzene
Peihua Zhu,Yanfang Zhao,Haiyan Chen,Qingtao Cui
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809009672
Abstract: In the title compound, C21H19BrO2, the dihedral angles between the central benzene ring and the two peripheral rings are 50.28 (5) and 69.75 (2)°. The O—CH2 bonds lie in the plane of the central ring and adopt a syn–anti conformation.
(3-Benzoyl-1,7,7-trimethylbicyclo[2.2.1]heptan-2-olato-κ2O,O)bis[2-(2-pyridyl)phenyl-κ2C1,N]iridium(III)
Kaijun Luo,Juan Jia,Yanfang Chen,Daibing Luo
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811039262
Abstract: The title compound, [Ir(C11H8N)2(C17H19O2)], has an octahedral coordination geometry around the IrIII atom, retaining the cis-C,C,trans–N,N chelate disposition of the two 2-phenylpyridine ligands. The chelate rings are nearly mutually perpendicular [the interplanar angles range from 85.48 (17) to 89.17 (19)°]. The two 2-(2-pyridyl)phenyl ligands are approximately planar, with the plane of the phenyl ring being inclined to that of the pyridine ring by 2.3 (3) and 5.1 (3)° in the two ligands. The interplanar angle between the phenyl ring in 3-benzoyl-camphor and the IrO2C3 chelate ring is 35.5 (2)°.
Lipopolysaccharide promotes lipid accumulation in human adventitial fibroblasts via TLR4-NF-κB pathway
Wang Jun,Si Yanfang,Wu Chen,Sun Lu
Lipids in Health and Disease , 2012, DOI: 10.1186/1476-511x-11-139
Abstract: Background Atherosclerosis is a chronic degenerative disease of the arteries and is thought to be one of the most common causes of death globally. In recent years, the functions of adventitial fibroblasts in the development of atherosclerosis and tissue repair have gained increased interests. LPS can increase the morbidity and mortality of atherosclerosis-associated cardiovascular disease. Although LPS increases neointimal via TLR4 activation has been reported, how LPS augments atherogenesis through acting on adventitial fibroblasts is still unknown. Here we explored lipid deposition within adventitial fibroblasts mediated by lipopolysaccharide (LPS) to imitate inflammatory conditions. Results In our study, LPS enhanced lipid deposition by the up-regulated expression of adipose differentiation-related protein (ADRP) as the silencing of ADRP abrogated lipid deposition in LPS-activated adventitial fibroblasts. In addition, pre-treatment with anti-Toll-like receptor 4 (TLR4) antibody diminished the LPS-induced lipid deposition and ADRP expression. Moreover, LPS induced translocation of nuclear factor-κB (NF-κB), which could markedly up-regulate lipid deposition as pre-treatment with the NF-κB inhibitor, PDTC, significantly reduced lipid droplets. In addition, the lowering lipid accumulation was accompanied with the decreased ADRP expression. Furthermore, LPS-induced adventitial fibroblasts secreted more monocyte chemoattractant protein (MCP-1), compared with transforming growth factor-β1 (TGF-β1). Conclusions Taken together, these results suggest that LPS promotes lipid accumulation via the up-regulation of ADRP expression through TLR4 activated downstream of NF-κB in adventitial fibroblasts. Increased levels of MCP-1 released from LPS-activated adventitial fibroblasts and lipid accumulation may accelerate monocytes recruitment and lipid-laden macrophage foam cells formation. Here, our study provides a new explanation as to how bacterial infection contributes to the pathological process of atherosclerosis.
Altitudinal Variations of Ground Tissue and Xylem Tissue in Terminal Shoot of Woody Species: Implications for Treeline Formation
Hong Chen, Haiyang Wang, Yanfang Liu, Li Dong
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0062163
Abstract: 1. The terminal shoot (or current-year shoot), as one of the most active parts on a woody plant, is a basic unit determining plant height and is potentially influenced by a variety of environmental factors. It has been predicted that tissues amount and their allocation in plant stems may play a critical role in determining plant size in alpine regions. The primary structure in terminal shoots is a key to our understanding treeline formation. The existing theories on treeline formation, however, are still largely lacking of evidence at the species level, much less from anatomy for the terminal shoot. 2. The primary structures within terminal shoot were measured quantitatively for 100 species from four elevation zones along the eastern slope of Gongga Mountain, southwestern China; one group was sampled from above the treeline. An allometric approach was employed to examine scaling relationships interspecifically, and a principal components analysis (PCA) was performed to test the relation among primary xylem, ground tissue, species growth form and altitude. 3. The results showed that xylem tissue size was closely correlated with ground tissue size isometrically across species, while undergoing significant y- or/and x-intercept shift in response to altitudinal belts. Further, a conspicuous characteristic of terminal shoot was its allocation of contrasting tissues between primary xylem and ground tissues with increasing elevation. The result of the PCA showed correlations between anatomical variation, species growth form/height classes and environment. 4. The current study presents a comparative assessment of the allocation of tissue in terminal shoot across phylogenically and ecologically diverse species, and analyzes tissue, function and climate associations with plant growth forms and height classes among species. The interspecific connection between primary xylem ratio and plant size along an elevation gradient suggests the importance of primary xylem in explaining the treeline formation.
Simulating the Conversion of Rural Settlements to Town Land Based on Multi-Agent Systems and Cellular Automata
Yaolin Liu, Xuesong Kong, Yanfang Liu, Yiyun Chen
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0079300
Abstract: Rapid urbanization in China has triggered the conversion of land from rural to urban use, particularly the conversion of rural settlements to town land. This conversion is the result of the joint effects of the geographic environment and agents involving the government, investors, and farmers. To understand the dynamic interaction dominated by agents and to predict the future landscape of town expansion, a small town land-planning model is proposed based on the integration of multi-agent systems (MAS) and cellular automata (CA). The MAS-CA model links the decision-making behaviors of agents with the neighbor effect of CA. The interaction rules are projected by analyzing the preference conflicts among agents. To better illustrate the effects of the geographic environment, neighborhood, and agent behavior, a comparative analysis between the CA and MAS-CA models in three different towns is presented, revealing interesting patterns in terms of quantity, spatial characteristics, and the coordinating process. The simulation of rural settlements conversion to town land through modeling agent decision and human-environment interaction is very useful for understanding the mechanisms of rural-urban land-use change in developing countries. This process can assist town planners in formulating appropriate development plans.
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