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Search Results: 1 - 10 of 23461 matches for " Yanna Zheng "
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Study on a Comprehensive Energy-Saving Sail by CFD Method  [PDF]
Yanna Zheng, Dexing Liu, Hongwei An, Wenjia Sun, Tiaojian Xu
Open Journal of Fluid Dynamics (OJFD) , 2016, DOI: 10.4236/ojfd.2016.63012
Abstract: A comprehensive energy-saving sail (CES) has been proposed in order to promote energy saving and emission reduction from shipping. Wind energy is harvested for propulsion and electrical generator at the same time by a unique structure of CES. A CFD (Computational Fluid Dynamics) code is verified by a case of arc wind sail, and it is used to simulate the pressure and velocity around the CES. The results show that the outlet velocity of air tunnel Vo and wind velocity Vi serve as an equation Vo ≈ 1.31Vi, which means the CES can effectively improve the conversion efficiency. In addition, it is found that Vo increases with the tunnel diameter to some extend over which it will keep almost constant.
Carbon-coated Si-Cu/graphite Composite as Anode Material for Lithium-ion Batteries
Pu Wang , Yanna NuLi , Jun Yang, Ying Zheng
International Journal of Electrochemical Science , 2006,
Abstract: The carbon-coated Si-Cu/graphite composite was obtained by mechanical milling of mixture of Si-Cu alloy and graphite followed by pyrolysis reaction of coal-tar pitch. XRD and SEM results showed Cu5Si alloy was formed after the intensive ball milling and SiC phase appeared after pyrolysis, composite particles were encapsulated by carbon matrix and the surface become smooth and compact. The electrochemical results exhibited the introduction of carbon-coating process decreased reversible capacity but obviously improved cycle performance. The reduced capacity was related to the inactive SiC phase and the improved cycle performance is mainly attributed to the homogeneous distribution of nanosized Si in silicon–copper alloy and elastic carbon matrix.
General Problems in Chinese Translations of Shakespeare
Yanna Sun
Asian Culture and History , 2010, DOI: 10.5539/ach.v2n2p232
Abstract: Shakespeare was not known to the Chinese until Lin Zexu’s (1785-1850) translation of Hugh Murray’s (1789-1845) Cyclopedia of Geography (1836). Since then, the Chinese perception of Shakespeare has changed several times, from his being regarded as a story-teller to being fully received as a seasoned playwright and poet, through to his plays being rendered into the Chinese language and performed on the Chinese stage. First and foremost is the question of how to adequately translate Shakespeare. The quality of the translation is important, particularly for those readers who have no knowledge at all of the English language or of the historical and cultural backdrop to his plays. But this is no easy task – not least because there are many significant cultural and linguistic divergences between China and England and their respective languages. Through detailed analysis of previous Chinese renditions of Shakespearian plays, this article will point out some general problems frequently facing the translator of the playwright.
Translating Methods of Shakespeare in China
Yanna Sun
English Language Teaching , 2009, DOI: 10.5539/elt.v2n2p138
Abstract: Shakespeare was not known to the Chinese until Lin Zexu’s (1785-1850) translation of Hugh Murray’s (1789-1845) Cyclopedia of Geography (1836). Afterwards Shakespeare in China saw many complicated changes, from being regarded as a story-teller to being fully received as a seasoned playwright and poet, and his plays were rendered into the Chinese language and performed on the Chinese stage. But first and foremost is the question of how to translate Shakespeare well, for translation is primarily important for those readers who have no knowledge at all of the English language.
De hermanos y utopías, diálogo entre Ecuador y México (1928-1938)
Yanna Hadatty Mora
Latinoamérica. Revista de estudios Latinoamericanos , 2005,
Abstract: Este artículo muestra los vínculos entre la literatura y la historia de la cultura de Ecuador y México, entre los a os veinte y treinta del siglo XX, a partir del rastreo de fuentes poco conocidas. En este ensayo, dividido entre documentos históricos y textos literarios , la autora elabora algunas de las relaciones político-ideológicas de los escritores, que desempe an un papel tanto en la literatura como en la política. En el ámbito político, la relación se instaura a partir de la imagen que los escritores ecuatorianos tienen en estos a os sobre la Revolución mexicana. Se entrevé México como utopía fundamental en la relación con Latinoamérica. Como se trata de autores de la denominada vanguardia histórica, el ideal estético y el ideal político se superponen y confunden, en la misma noción de vanguardia
A note on skew spectrum of graphs
Yanna Wang,Bo Zhou
Mathematics , 2013,
Abstract: We give some properties of skew spectrum of a graph, especially, we answer negatively a problem concerning the skew characteristic polynomial and matching polynomial in [M. Cavers et al., Skew-adjacency matrices of graphs, Linear Algebra Appl. 436 (2012) 4512--4529].
A note on the minimum skew rank of a graph
Yanna Wang,Bo Zhou
Mathematics , 2012,
Abstract: The minimum skew rank $mr^{-}(\mathbb{F},G)$ of a graph $G$ over a field $\mathbb{F}$ is the smallest possible rank among all skew symmetric matrices over $\mathbb{F}$, whose ($i$,$j$)-entry (for $i\neq j$) is nonzero whenever $ij$ is an edge in $G$ and is zero otherwise. We give some new properties of the minimum skew rank of a graph, including a characterization of the graphs $G$ with cut vertices over the infinite field $\mathbb{F}$ such that $mr^{-}(\mathbb{F},G)=4$, determination of the minimum skew rank of $k$-paths over a field $\mathbb{F}$, and an extending of an existing result to show that $mr^{-}(\mathbb{F},G)=2match(G)=MR^{-}(\mathbb{F},G)$ for a connected graph $G$ with no even cycles and a field $\mathbb{F}$, where $match(G)$ is the matching number of $G$, and $MR^{-}(\mathbb{F},G)$ is the largest possible rank among all skew symmetric matrices over $\mathbb{F}$.
Body Mass Index, Waist Circumference and Cut-Off Points for Metabolic Syndrome in Urban Residents in Ningxia  [PDF]
Jianjun Yang, Hongyan Qiu, Hongyu Li, Yuhong Zhang, Xiujuan Tao, Yanna Fan
Open Journal of Endocrine and Metabolic Diseases (OJEMD) , 2015, DOI: 10.4236/ojemd.2015.512020
Abstract: A growing number of studies show that different countries and populations require different cut-off points for body mass index (BMI), and waist circumference (WC) leading to obesity. There are no data on optimal cut-off points to metabolic syndrome (MS) among urban residents in Ningxia. Our aim is to determine the appropriate cut-off points for BMI and WC associated with elevated prevalent MS risk among urban residents in Ningxia. A total of 2500 urban residents in Ningxia were examined from May 2008 to March 2009 in a community-based cross-sectional study. Height, body weight, waist circumference and hip circumference were measured to calculate BMI. Fasting blood glucose (FBG), plasma levels of triglyceride (TG), total cholesterol (TC), and high-density lipoprotein cholesterol (HDL-C) were examined using a blood glucose meter and the chromatographic enzyme method. BMI and WC were measured to assess overweight or obesity. Of these, 301 subjects were chosen according to metabolic syndrome diagnosis standards to form the case group. The control group comprised 301 healthy people without diabetes, hypertension, hyperlipemia, coronary heart disease, cerebrovascular disease, malignant tumors or chronic infections. Logistic regression and receiver-operating characteristic (ROC) curve analyses were used to determine optimal cut-off points for BMI and WC in relation to the area under the curve (AUC), sensitivity and specificity. The optimal cut-off points for male and female respectively were 24.78 kg/m2(sensitivity = 0.879, specificity = 0.648) and 24.72 kg/m2(sensitivity = 0.804, specificity = 0.767) for BMI, 85.95 cm (sensitivity = 0.701, specificity = 0.641) and 78.25 cm (sensitivity = 0.804, specificity = 0.528) for WC. Urban residents in Ningxia were at high risk of MS, and the cut-off points for BMI and WC were lower than the data currently recommended in Asian population.
Interactions between Two Fungi Strains during Litter Decomposition through a Microcosm Experiment: Different Degradative Enzyme Activities  [PDF]
Yan Chen, Gaozhong Pu, Bo Lian, Xiuxia Pei, Guifang Huang, Qifeng Wang, Yanna Lv
Advances in Enzyme Research (AER) , 2018, DOI: 10.4236/aer.2018.61001
Abstract: Fungi are the key agents in litter decomposition in forest ecosystems. However, the specific roles of the interactions between different fungal species during litter decomposition process are unclear. To evaluate the interactions, two fungi strains with significantly different morphs were isolated from the soils of Quercus acutissima forest and Pinus massoniana forest, and inoculated in the litter powder of Quercus acutissima leaves and Pinus massoniana needles with grown separately and in coexistence equally through a microcosm experiment. The enzyme activities were determined as a proxy for microbial activities. The results showed that the degradative enzymes involved in litter decomposition showed varying dynamics pattern during the incubation period. The interactions between the two fungi strains are synergism, and benefit to each other according to enzyme activities, suggesting that a fungi strain growth was accelerated by the presence of other fungi strain during litter decomposition process. However, the interactions of the two fungi strains were bilateral antagonism inoculated in the litter powder of Quercus acutissima leaves according to cellobiohydrolase activities. The synergism, despite bilateral antagonism in an exceptional case, may be an important factor controlling the fungal colonization and growth on litter substrate. The results implied that more fungal species may accelerate litter decomposition rates due to their mutual cooperation.
Intravenous Glial Growth Factor 2 (GGF2) Isoform of Neuregulin-1β Improves Left Ventricular Function, Gene and Protein Expression in Rats after Myocardial Infarction
Michael F. Hill, Amish V. Patel, Abigail Murphy, Holly M. Smith, Cristi L. Galindo, Laura Pentassuglia, Xuyang Peng, Carrie G. Lenneman, Oghenerukevwe Odiete, David B. Friedman, Marvin W. Kronenberg, Siyuen Zheng, Zhongming Zhao, Yanna Song, Frank E. Harrell, Maya Srinivas, Anindita Ganguly, Jennifer Iaci, Tom J. Parry, Anthony O. Caggiano, Douglas B. Sawyer
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0055741
Abstract: Aims Recombinant Neuregulin (NRG)-1β has multiple beneficial effects on cardiac myocytes in culture, and has potential as a clinical therapy for heart failure (HF). A number of factors may influence the effect of NRG-1β on cardiac function via ErbB receptor coupling and expression. We examined the effect of the NRG-1β isoform, glial growth factor 2 (GGF2), in rats with myocardial infarction (MI) and determined the impact of high-fat diet as well as chronicity of disease on GGF2 induced improvement in left ventricular systolic function. Potential mechanisms for GGF2 effects on the remote myocardium were explored using microarray and proteomic analysis. Methods and Results Rats with MI were randomized to receive vehicle, 0.625 mg/kg, or 3.25 mg/kg GGF2 in the presence and absence of high-fat feeding beginning at day 7 post-MI and continuing for 4 weeks. Residual left ventricular (LV) function was improved in both of the GGF2 treatment groups compared with the vehicle treated MI group at 4 weeks of treatment as assessed by echocardiography. High-fat diet did not prevent the effects of high dose GGF2. In experiments where treatment was delayed until 8 weeks after MI, high but not low dose GGF2 treatment was associated with improved systolic function. mRNA and protein expression analysis of remote left ventricular tissue revealed a number of changes in myocardial gene and protein expression altered by MI that were normalized by GGF2 treatment, many of which are involved in energy production. Conclusions This study demonstrates that in rats with MI induced systolic dysfunction, GGF2 treatment improves cardiac function. There are differences in sensitivity of the myocardium to GGF2 effects when administered early vs. late post-MI that may be important to consider in the development of GGF2 in humans.
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