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Search Results: 1 - 10 of 3476 matches for " Liwei Niu "
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Document Analysis of Correlation between Climate and Stroke  [PDF]
Hongwei Li, Yonggang Qian, Shubi Wang, Hairong Zhang, Wenfang Gou, Mingzhu Niu, Di Yu, Ruijie Wu, Liqun Gao, Baofeng Chi, Qingxia Wang, Wenli Hao, Wuyuntana Li, Tao Yan, Liwei Niu, Yan Liu, Jing Zhao, Yuan Jin, Maolin Du, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2019, DOI: 10.4236/ojepi.2019.91008
Abstract: Aim: The aim of the research is to determine characteristic of the correlation between climate and stroke through the analysis of relevant documents. Methods: We found 115 researches of temperature and season on stroke mortality/incidence and these were categorized according to location, meteorology, date span, data source and research sites’ latitudes. We divided the globe into 5 temperature zones based on latitude ranges: 0 - 10, 10 - 23.5, 23.5 - 40, 40 - 50, and >50 degrees, and allotted a zone to each country. Stroke mortality by five temperature zones was calculated per 100,000 people. Results: 70% of the researches came from latitudes greater than 40 degrees with 92% of researches located in Europe, USA, and Asia. The mortality range was 42 - 63 per 105 individuals within latitudes 0 - 40 degrees. In latitudes 40 - 66.5 degrees, a linear upward trend (y = 69.82x 22.823, R2 = 0.99) was noticed. More than 75% of the research reports indicated a negative correlation between climate and stroke, and the proportion was almost 6 and 7 times greater than that of the fluctuation and non-correlation, respectively. The most frequently used research methods were regression analysis and time series analysis. Conclusion: All of the research results confirmed that lower temperature is associated with higher mortality and incidence of stroke, while higher latitude is correlated with higher stroke mortality, consistent with the temperature zones.
The Many-on-One Stochastic Duel Model with Information-Sharing  [PDF]
Jianjun Li, Liwei Liu
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.36097
Abstract: In this paper we extend the one-on-one stochastic duel model with searching to the many-on-one case based on information-sharing. We have derived the probability density function of the time to kill the target in many-on-one model. It is illustrated by an example in which the firing time and the searching time are of different exponential distributions.
A Qualitative Analysis on the Occurrence of Learned Helplessness among EFL Students
Liwei Hsu
Journal of Educational and Developmental Psychology , 2011, DOI: 10.5539/jedp.v1n1p162
Abstract: This study seeks to provide some comprehensive information on EFL students’ learned helplessness when learning English, by exploring the causal relationship between three variables: failure to learn English, personality traits and intrinsic/extrinsic motivation. Eighteen students and two English teachers participated in this study with a gatekeeper’s consent. This was done mainly through focus group interviews. The data was elicited from the NEO-FI Personality Trait Inventory with a cross analysis done on the in-depth interviews. The findings indicate that students with different personality traits do regard their failure to learn English in different ways. This in turn, leads to various influences that decrease their intrinsic motivation. The intrinsic motivation for all of the participants is inevitably affected by failure, but learners with a neuroticism trait are the most sensitive to failure. Therefore, these are the students who are most susceptible to experiencing learned helplessness when learning English, while students with traits of openness, extraversion and agreeableness can reactivate their extrinsic motivation when appealed to by external incentives. However, this study also discovered that there was a mismatch between a teacher’s judgment on student amotivation and the student’s self-assessment of his/her motivation to learn English.
Hemodynamic effects of partial splenic artery embolization in patients with liver cirrhosis and portal hypertension
DUAN Liwei
Journal of Clinical Hepatology , 2013,
Abstract: ObjectiveTo investigate the clinical efficacy and therapeutic value of partial splenic artery embolization (PSE) for treating portal hypertension in patients with liver cirrhosis. MethodsTwenty-three patients diagnosed with liver cirrhosis of different etiology and with portal hypertension were treated with PSE. Diameter and blood flow velocity of the portal vein (PV) and splenic vein (SV) were measured by color Doppler ultrasound before PSE (baseline) and after PSE (postoperative week 1 and months 1, 3, and 6). Statistical significance of differences was assessed by paired t-test. ResultsBoth the PV and SV blood flow velocities were significantly enhanced after PSE (all postoperative times vs. baseline, P<0.05). SV diameter was significantly reduced after PSE (all postoperative times vs. baseline, P<005). PV diameter, however, was not significantly reduced at six months after PSE (vs. baseline, P≥0.05). ConclusionPSE can reduce portal vein pressure in patients with liver cirrhosis.
Woman Subculture Development Seen from Woman Language
Liwei Zhu
Journal of Language Teaching and Research , 2011, DOI: 10.4304/jltr.2.3.613-617
Abstract: The woman subculture study is widely conducted through several decades since the beginning of the second wave feminist movement in 1960s. This paper intends to explain the woman subculture development in view of the woman language. First, it gives the definition of subculture. Second, it explains why woman culture is considered as a subculture. Third, with reference to sociolinguistic studies of woman language, it offers further clarification of some important feminist theories like gendered knowledge, standpoint theory and muted group theory. Also some key conceptions which are closely tied to woman subculture are expounded through the analysis of woman language. Last, the paper explains how woman subculture is transmitted through feminist theories and literary criticism works and how it is divided into three phases.
The $L^p$ boundedness of the Bergman projection for a class of bounded Hartogs domains
Liwei Chen
Mathematics , 2013,
Abstract: We generalize the Hartogs triangle to a class of bounded Hartogs domains, and we prove that the corresponding Bergman projections are bounded on $L^p$ if and only if $p$ is in the range $(\frac{2n}{n+1},\frac{2n}{n-1})$.
Weighted Sobolev regularity of the Bergman projection on the Hartogs triangle
Liwei Chen
Mathematics , 2015,
Abstract: We prove a weighted Sobolev estimate of the Bergman projection on the Hartogs triangle, where the weight is some power of the distance to the singularity at the boundary. This method also applies to the $n$-dimensional generalization of the Hartogs triangle.
Weighted Bergman Projection on the Hartogs Triangle
Liwei Chen
Mathematics , 2014,
Abstract: We prove the $L^p$ regularity of the weighted Bergman projection on the Hartogs triangle, where the weights are powers of the distance to the singularity at the boundary. The restricted range of $p$ is proved to be sharp. By using a two-weight inequality on the upper half plane with Muckenhoupt weights, we can consider a slightly wider class of weights.
Effect of Fine-Grained Lexical Rating on L2 Learners’ Lexical Learning Gain  [PDF]
Ruiying Niu
Open Journal of Modern Linguistics (OJML) , 2015, DOI: 10.4236/ojml.2015.55038
Abstract: In assessing L2 lexical learning, especially initial learning, researchers always face the problem of whether partial word learning should be counted. Existing studies have either counted partial word learning (i.e. counted both partial and complete word learning) or have only counted complete word learning. However, it is not clear whether counting partial word learning makes a difference in capturing task-based and intra-learner lexical learning gain. Few studies have investigated this potential difference and even fewer if both productive and receptive lexical learning are considered. The present study employed differently fine-grained word rating methods to assess three Chinese EFL learner groups’ performances on four vocabulary posttests after receiving three treatment tasks: a written output task, an oral output task, and a reading task. Data analyses revealed that the use of differently fine-grained scoring methods did not necessarily affect learners’ cross-task lexical learning effects significantly, but it did make a significant difference in measuring individual learners’ lexical learning gain. The findings are discussed with reference to whether and how a less or more fine-grained scoring method should be adopted in rating lexical learning.
An Analysis of E-Commerce Enterprises Sustainable Development and Financing Structure  [PDF]
Yucao Niu
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.65106
Abstract: O2O (Online to Offline) is a kind of new e-commerce mode and has brought new development opportunities for e-commerce enterprises. Through investing and financing, some e-commerce enterprises improved their performance rapidly in the short term. But some face serious operational risk, even bankruptcy. It’s still a question whether the e-commerce enterprises have achieved sustainable development or not. The relationship between financing structure and sustainable development needs to be studied. Based on the sustainable development theory and Higgins sustainable growth model, this paper uses SPSS to analyze the financial statement data of 98 listed e-commerce companies. The empirical results reveal that actual growth rates don’t match the sustainable growth rates, which means that E-commerce enterprises don’t achieve sustainable growth. And the sustainable growth rate is correlated with the financing structure. Lastly, this paper puts forward constructive suggestions about financing structure adjustment.
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