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Search Results: 1 - 10 of 88727 matches for " Yao Chen "
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Spectroscopy Studies on Stream Sediments in the Terahertz Range  [PDF]
Chen Chen, Jinsong Liu, Jianquan Yao
Optics and Photonics Journal (OPJ) , 2016, DOI: 10.4236/opj.2016.68B024
Abstract:
In order to study stream sediments in the terahertz range, we have measured six reference stream sediment samples by terahertz time-domain spectroscopy (THz-TDS). We obtained the absorption coefficients and refractive indexes. By analyzing the spectra, we got different drops in amplitude and delays in time. The absorption and refractive properties of samples changed with its components and types. In addition, we also found there was a nearly linear relationship between the absorption coefficient and the frequency. We calculated the slope value (K) of each sample by linear fitting, and find the K was corresponding to the contents of the samples. The results showed THz-TDS was an effective method to the analysis of stream sediments.
Factor Analysis of Differences in Biomass Accumulations between Male and Female emph{Populus Cathayana} Deedlings under Drought Stress
Yao Chen
Journal of Mathematics Research , 2012, DOI: 10.5539/jmr.v4n3p142
Abstract: The main influential factor of biomass accumulations between male and female emph{Populus cathayana} seedlings is investigated from the point of factor analysis according to biomass of emph{P. cathayana} seedlings under drought stress as well as related morphological, physiological, and biochemical indicators. The results shows that biomass accumulations in male and female plants under drought stress are mainly associated with stem dry mass (SDM), root dry mass (RDM), height growth (HG), basal diameter (BD), total leaf number (TLN) and other morphologic changes, and have little relation with intrinsic water use efficiency (WUE). There is sex differences in the mode of biomass accumulation between male and female plants. Biomass accumulation in female plants depends on morphologic changes, followed by hormonal regulation, and finally physiological progress. However, biomass accumulation in male plants depends on morphologic changes (similar to female plants), followed by physiological progress, and finally hormonal regulation. Moreover, biomass accumulation in female plants on the morphologic aspects mainly depends on SDM, while is not relevant to TLN. However, male plants mainly depend on SDM, and have relationship with TLN. In sum, our study demonstrates that biomass accumulations in male and female emph{P. cathayana} seedlings under drought stress have different strategies.
The Reaction Sequence and Dielectric Properties of BaAl2Ti5O14 Ceramics  [PDF]
Xiaogang Yao, Wei Chen, Lan Luo
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B008
Abstract: To investigate the correct reaction sequence of BaO-Al2O3-5TiO2 system, powders calcined at different temperatures are analyzed by x-ray diffraction. The results show that the source phase BaCO3 decomposes below 800°C, TiO2 and Al2O3 start to consume at 900 and 1100°C, respectively. BaTi4O9 phase appears at 1000°C while BaAl2Ti5O14 phase starts to reveal at 1200°C. As the temperature increases, the density, dielectric constant and quality factor of the BaAl2Ti5O14 ceramic increase and keep unchanged at 1350°C. The dielectric properties of BaAl2Ti5O14 ceramic sintered at 1350°C for 3h are: εr=35.8, Q×f=5130GHz, τf=-6.8ppm/°C.
The Impact of Global Financial Crisis on Health Status in the Chinese Mainland*  [PDF]
Chen Li, Yao Lan, Jiang Hong
Chinese Studies (ChnStd) , 2013, DOI: 10.4236/chnstd.2013.23023
Abstract: Nowadays, globalization increases the integration between countries, leading to the emergence of a global marketplace or a single world market. And, no country or region can develop in self-seclusion. The financial crisis is unprecedented because it comes at a time of radically increased interdependence. What is more, financial turmoil is contagious, moving rapidly from one country to another and spreading very quickly from one economic sector to many others. Since the reform and opening up, China has made remarkable economic achievements. Especially in the economic globalization trend, the financial sector has developed rapidly and its influence on economy is also growing fast. However, along with the rapid development of economy and the outbreak of financial crisis, economic factors play an important role in modern society. Due to the influence of the current global financial and economic crisis, efforts to reach health-related MDGs are confronted with daunting challenges. Public health departments of all countries are faced with increased demand for their services(Liu Zhenmin,2009), the risk of lower services quality, contraction of financial resources as well as a higher risk of a “brain drain” of health professionals. Hence, this paper aims to analyze the impact of the global recession on the health of people in the Chinese mainland and sum up a series of measures to ensure the steady growth of national economy and safeguard the social harmony and stability.
Analysis of Thermal Conductivity of Frost on Cryogenic Finned-tube Vaporizer Using Fractal Method  [PDF]
Shuping Chen, Shuting Yao, Fushou Xie
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B021
Abstract: Thermal conductivity of frost is not only related to density, but also affected by its microstructure and environmental conditions, and it will continuously change with the formation and growth of frost. Images of frost formation and growth on the cryogenic surface in various shapes at different stages were obtained by experimental measurements, and a numerical simulation of frost formation and growth was carried out based on Diffusion Limited Aggregation (DLA) model of fractal theory in this paper. Based on the frost structure obtained by experiment, the fractal dimension of pore area distribution and porosity of frost layer on the cryogenic finned-tube vaporizer were calculated by using fractal method, and combined with heat conduction model of frost layer obtained by thermal resistance method, the thermal conductivity of frost on the cryogenic surface was calculated. The result shows that the thermal conductivity calculated by the fractal model coincides with the range of the experimental data. Additionally, comparison with other heat conduction models indicated that it is feasible to introduce the fractal dimension of pore area distribution into heat conduction model to deduce the thermal conductivity of frost.
Analysis of Yellow Water in Liquor Fermentation with Sensor Array  [PDF]
Bo Chen, Yi Yao, Haijiao Luo
Journal of Sensor Technology (JST) , 2019, DOI: 10.4236/jst.2019.91001
Abstract: Yellow water is a by-product of liquor in the solid state fermentation process, and contains a large amount of nutrients, such as acids, esters, alcohols and aldehydes produced by fermentation. The components in the yellow water reflect the fermentation information to a certain extent, so the fermentation process can be monitored by detecting the yellow water component online. A sensor array detection device is designed for detecting yellow water. In addition, chemical titration is used to obtain data such as acidity, reducing sugar and starch of yellow water. Principal component analysis and discriminant function analysis were performed on the data; and a multivariate linear regression was used to establish a prediction model for the data. The results showed that the prediction bias for acidity and alcohol was small, 0.39 and 0.43, respectively.
In-Vitro Inhibitory Effect of Methanol Extracts of Chinese Herbal Drugs on Supercoiling Activity of Bacterial DNA Gyrase  [PDF]
Hui Xu, Huizhi Chen, Pan Yao, Guodong Lin, Weiwen Chen
Chinese Medicine (CM) , 2013, DOI: 10.4236/cm.2013.41004
Abstract:

A large number of Chinese herbal drugs (CHDs) exhibit antibacterial activities both in vivo and in vitro, but until now little is known regarding their inhibitory mechanisms. Bacterial DNA gyrase is a proven target for antibacterial agents. Aim of this study was to investigate the in-vitro inhibitory effect of methanol extracts of CHDs against supercoiling activity of bacterial DNA gyrase. Fifteen CHDs were selected and extracted with methanol, respectively. Inhibitory effect of the extracts on DNA gyrase was tested using gel-based DNA supercoiling assay. Among fifteen CHDs tested, methanol extracts of Lonicerae Japonicae Flos (S2), Taraxaci Herba (S7), Glycyrrhizae Radix et Rhizoma Praeparata cum Melle (S8) demonstrated an obvious inhibitory effect against supercoiling activity of DNA gyrase, and the others were either less active or could not be determined with the present method. Moreover, it was likely that S7 and S8 inhibit gyrase in a concentration-dependent manner. In conclusion, DNA supercoiling assay is a promising method to study the inhibitory activity of CHDs on bacterial DNA gyrase. Some CHDs do have gyrase-inhibitory activity as proposed. Further investigations are needed to elucidate the inhibition mechanism of these CHDs on supercoiling activity of gyrase.

Ubiquitin-conjugating enzyme involved in the immune response caused by pathogens invasion  [PDF]
Liang Chen, Chen Cheng, Chunxia Zhang, Qin Yao, Ermi Zhao
Open Journal of Immunology (OJI) , 2013, DOI: 10.4236/oji.2013.33013
Abstract:

Ubiquitin-proteasome pathway (UPP) is a significant way of protein degradation and modification in eukaryotic cell and involved in a complex series of intracellular processes. As a key component in UPP, ubiquitin-conjugating enzyme (E2) plays an extremely important role in ubiquitin (Ub) transferring and substrate specific recognition. Abundant evidences have proved that UPP is involved in cells immune reaction caused by pathogens and the attendance of E2 has a significant effect on host cells and pathogen. This article presents an overview of the current research on E2s that is involved in immune response caused by viruses and bacteria.

Duality in Binocular Rivalry: Distinct Sensitivity of Percept Sequence and Percept Duration to Imbalance between Monocular Stimuli
Chen Song, Haishan Yao
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0006912
Abstract: Background Visual perception is usually stable and accurate. However, when the two eyes are simultaneously presented with conflicting stimuli, perception falls into a sequence of spontaneous alternations, switching between one stimulus and the other every few seconds. Known as binocular rivalry, this visual illusion decouples subjective experience from physical stimulation and provides a unique opportunity to study the neural correlates of consciousness. The temporal properties of this alternating perception have been intensively investigated for decades, yet the relationship between two fundamental properties - the sequence of percepts and the duration of each percept - remains largely unexplored. Methodology/Principal Findings Here we examine the relationship between the percept sequence and the percept duration by quantifying their sensitivity to the strength imbalance between two monocular stimuli. We found that the percept sequence is far more susceptible to the stimulus imbalance than does the percept duration. The percept sequence always begins with the stronger stimulus, even when the stimulus imbalance is too weak to cause a significant bias in the percept duration. Therefore, introducing a small stimulus imbalance affects the percept sequence, whereas increasing the imbalance affects the percept duration, but not vice versa. To investigate why the percept sequence is so vulnerable to the stimulus imbalance, we further measured the interval between the stimulus onset and the first percept, during which subjects experienced the fusion of two monocular stimuli. We found that this interval is dramatically shortened with increased stimulus imbalance. Conclusions/Significance Our study shows that in binocular rivalry, the strength imblanace between monocular stimuli has a much greater impact on the percept sequence than on the percept duration, and increasing this imbalance can accelerate the process responsible for the percept sequence.
Existence Analysis of Traveling Wave Solutions for a Generalization of KdV Equation
Yao Long,Can Chen
Mathematical Problems in Engineering , 2013, DOI: 10.1155/2013/462957
Abstract:
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