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Search Results: 1 - 10 of 81053 matches for " Zhihui Liu "
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A Case Study on the Influence of Organizational Culture on Language Classroom
Zhihui Liu
International Education Studies , 2009, DOI: 10.5539/ies.v2n3p114
Abstract: This paper tries to probe the influence of the organizational culture on language classroom at a newly-established local college. It firstly reviews the knowledge of the organizational culture and finds out its features, and then discusses how the organizational culture was greatly influenced by the host educational environment. On the basis of this, the paper interprets how organizational culture in turn influences the classroom culture in terms of English language teaching and learning in China.
The Influence of Job Autonomy on Employee’s Thriving at Work: An Innovative Theoretical Framework  [PDF]
Zhihui Li
Journal of Service Science and Management (JSSM) , 2018, DOI: 10.4236/jssm.2018.116042
Abstract: For enterprises facing a rapidly changing external environment, employee’s thriving at work may be the key to sustained success. After sorting out the current research situation of scholars home and abroad, several shortcomings emerge. In this paper a model of job autonomy affecting employees’ thriving at work through psychological capital is constructed, and the internal mechanism of job autonomy affecting employees’ thriving at work is investigated, which is helpful to grasp the impact of job autonomy on employees’ thriving at work more comprehensively.
CASZ1b, the Short Isoform of CASZ1 Gene, Coexpresses with CASZ1a during Neurogenesis and Suppresses Neuroblastoma Cell Growth
Zhihui Liu,Arlene Naranjo,Carol J. Thiele
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0018557
Abstract: In Drosophila, the CASZ1 (castor) gene encodes a zinc finger transcription factor and is a neural fate-determination gene. In mammals, the CASZ1 gene encodes two major isoforms, CASZ1a with 11 zinc fingers and CASZ1b with 5 zinc fingers. CASZ1b is more evolutionally conserved since it is the only homologue found in drosophila and Xenopus. Our previous study showed that full length CASZ1 (CASZ1a) functions to suppress growth in neuroblastoma tumor. However, the function of CASZ1b isoform in mammals is unknown. In this study, realtime PCR analyses indicate that mouse CASZ1b (mCASZ1b) is dynamically expressed during neurogenesis. CASZ1b and CASZ1a co-exist in all the neuronal tissues but exhibit distinct expression patterns spatially and temporally during brain development. CASZ1b and CASZ1a expression is coordinately upregulated by the differentiation agent Retinoic Acid, as well as agents that modify the epigenome in neural crest derived neuroblastoma cell lines. In contrast CASZ1b is down regulated while CASZ1a is upregulated by agents that raise intracellular cAMP levels. CASZ1b and CASZ1a have no synergistic or antagonistic activities on the regulation of their target NGFR gene transcription. Specific restoration of CASZ1b in NB cells suppresses tumor growth in vitro and in vivo. Consistent with its function role, we find that low CASZ1b expression is significantly associated with decreased survival probability of neuroblastoma patients (p<0.02). This study indicates that although their mechanisms of regulation may be distinct, both CASZ1b and CASZ1a have largely redundant but critical roles in suppressing tumor cell growth.
Synthesis and Evaluation of 2-Amino-4H-Pyran-3-Carbonitrile Derivatives as Antitubercular Agents  [PDF]
Chunxia Chen, Minghui Lu, Zhihui Liu, Junting Wan, Zhengchao Tu, Tianyu Zhang, Ming Yan
Open Journal of Medicinal Chemistry (OJMC) , 2013, DOI: 10.4236/ojmc.2013.34015
Abstract: A series of 2-amino-4H-pyran-3-carbonitrile derivatives were designed and synthesized. Their antitubercular activities
were evaluated against autoluminescent M. tuberculosis H37Ra and standard strain M. tuberculosis H37Rv. No obvious
antitubercular activities could be observed (MIC > 10 ug/mL). The results are in sharp contrast with the previously reported
data.
Finite Element Approximations for Semilinear Elliptic Stochastic Partial Differential Equations with Additive Gaussian Noises
Yanzhao Cao,Jialin Hong,Zhihui Liu
Mathematics , 2015,
Abstract: We study finite element approximations for boundary value problems of elliptic semilinear stochastic partial differential equations (SPDEs) driven by Gaussian noises. Formulated in the form of Karhunen-Lo\`{e}ve (K-L) expansions, the noises cover some of the most commonly used special cases in physics and engineering applications, including white noises and colored noises characterized by the power-law in non-rectangular domains. Through the convergence analysis for a sequence of approximate solutions of SPDEs where the noises are the truncations of the K-L expansions, we obtain covariance operator dependent sufficient and necessary conditions for the well-posedness of the continuous problem. These SPDEs with truncated noises are then used to construct finite element approximations. A general framework of rigorous error estimates for the finite element approximations is established for the Gaussian noises in the abstract K-L expansion forms. Based on this general framework and with the help of Weyl's law, we derive optimal error estimates for finite element approximations of SPDEs driven by white noises and power-law noises. The error analysis illustrates the effect of the coefficients of the K-L expansions on the overall optimal error estimate of the finite element approximation.
Finite Element Approximations for Semilinear Elliptic SPDEs driven by Fractional Brownian Motion with Hurst Parameter $H<\frac{1}{2}$
Yanzhao Cao,Jialin Hong,Zhihui Liu
Mathematics , 2015,
Abstract: We consider finite element approximations for one dimensional boundary value problems of semilinear elliptic stochastic partial differential equations (SPDEs) driven by a fractional Brownian motion with Hurst parameter $H<1/2$ based on the well-posedness of the problem. We make use of a sequence of approximate solutions with the fractional Brownian noise replaced by its piecewise constant discretization to construct the finite element approximations of the SPDEs. The error estimate of the approximations is derived through rigorous convergence analysis.
Preparation and characterization of the PVDF-based composite membrane for direct methanol fuel cells
Qian Liu, Laizhou Song, Zhihui Zhang, Xiaowei Liu
International Journal of Energy and Environment , 2010,
Abstract: The polyvinylidene fluoride-sulfonated polystyrene composite membrane with proton exchange performance, denoted as PVDF-SPS, was prepared using a thermally induced polymerization technique. The thermal stability of the PVDF-SPS composite membrane was investigated using thermogravimetric (TG) analysis. The complex formation of the composite membrane was ascertained by Fourier transform infrared spectroscopy (FTIR). The surface compositions of the PVDF-SPS membrane were analyzed using X-ray photoelectron spectroscopy (XPS). The morphology of the composite membrane was characterized by environmental scanning electron microscopy (ESEM). The proton conductivity of the PVDF-SPS membrane was measured using impedance spectroscopy in the hydrated condition. The PVDF-SPS membrane has a stronger hydrophilic character than the pristine PVDF membrane and the polyvinylidene fluoride-polystyrene composite membrane (PVDF-PS), which is caused by the incorporation of sulfonic acid groups. The proton conductivity and the methanol permeability of the PVDF-SPS membrane measured at 298 K are 29.3 mS.cm-1 and 8.6×10-8 cm2.s-1, respectively. Although PVDF-SPS composite membrane possesses the lower oxidative stability than Nafion-117 membrane, the composite membrane displays lower methanol permeability than the Nafion-117 membrane, and the selectivity (the ratio of proton conductivity and methanol permeability) of the composite membrane is almost 20 times than that of Nafion-117.
Applications of Nanomaterials in Electrochemical Enzyme Biosensors
Huihui Li,Songqin Liu,Zhihui Dai,Jianchun Bao,Xiaodi Yang
Sensors , 2009, DOI: 10.3390/s91108547
Abstract: A biosensor is defined as a kind of analytical device incorporating a biological material, a biologically derived material or a biomimic intimately associated with or integrated within a physicochemical transducer or transducing microsystem. Electrochemical biosensors incorporating enzymes with nanomaterials, which combine the recognition and catalytic properties of enzymes with the electronic properties of various nanomaterials, are new materials with synergistic properties originating from the components of the hybrid composites. Therefore, these systems have excellent prospects for interfacing biological recognition events through electronic signal transduction so as to design a new generation of bioelectronic devices with high sensitivity and stability. In this review, we describe approaches that involve nanomaterials in direct electrochemistry of redox proteins, especially our work on biosensor design immobilizing glucose oxidase (GOD), horseradish peroxidase (HRP), cytochrome P450 (CYP2B6), hemoglobin (Hb), glutamate dehydrogenase (GDH) and lactate dehydrogenase (LDH). The topics of the present review are the different functions of nanomaterials based on modification of electrode materials, as well as applications of electrochemical enzyme biosensors.
A New Type of Fbg Sensor with High Temperature Sensitivity
Zhihui Liu,Hongqiang Li,Hongda Chen,Haijing Yang
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: A method of using polymer to encapsulate the bare FBG is proposed and implemented. The principle of the increasing in sensitivity of FBG is introduced, a novel packaging material composed of 100 wt% unsaturated polyester, 2 wt% Methyl Ethyl Ketone Peroxide and 2 wt% cobalt naphthenate is realized. With the help of casting a model, FBG is encapsulated. After establishing the experimental platform, the temperature sensitivity of the packaged FBG is also analyzed. The comparison of the experimental results between the packaged FBG and the bare FBG shows that over the temperature of 24-44oC, the equivalent temperature sensitivity of the packaged FBG is 0.10387 nm/°C, which can be increased by about 14.268 times as much as that of bare FBG and close to the theoretical values 0.108 nm/°C. The FBG package material and technique is effective in the increasing of the temperature sensitivity, which is suitable for applications where wavelength references for FBG sensor system with high temperature sensitivity is required, especially in the measurement of human body temperature.
Modeling the Impacts of Boreal Deforestation on the Near-Surface Temperature in European Russia
Zhihui Li,Xiangzheng Deng,Qingling Shi,Xinli Ke,Yingcheng Liu
Advances in Meteorology , 2013, DOI: 10.1155/2013/486962
Abstract: Boreal deforestation plays an important role in affecting regional and global climate. In this study, the regional temperature variation induced by future boreal deforestation in European Russia boreal forest region was simulated based on future land cover change and the Weather Research and Forecasting (WRF) model. This study firstly tested and validated the simulation results of the WRF model. Then the land cover datasets in different years (2000 as baseline year, 2010, and 2100) was used in the WRF model to explore the impacts of boreal deforestation on the near-surface temperature. The results indicated that the WRF model has good ability to simulate the temperature change in European Russia. The land cover change in European Russia boreal forest region, which will be characterized by the conversion from boreal forests to croplands (boreal deforestation) in the future 100 years, will lead to significant change of the near-surface temperature. The regional annual temperature will decrease by 0.58°C in the future 100 years, resulting in cooling effects to some extent and making the near-surface temperature decrease in most seasons except the spring. 1. Introduction According to the fourth assessment report of Intergovernmental Panel on Climate Change (2007, IPCC AR4), there is a probability of more than 90 percent that human activities have affected the climate [1], mainly through two approaches: fossil fuel burning and land cover change. There is a consensus among the scientists that fossil fuel burning can lead to increase in the greenhouse gas concentration in the atmosphere and further results in the global warming, while the impacts of land cover change on the climate system at the local, regional, and global scales have become one of the research hotspots. Terrestrial land cover is an important component of the climate system. It is the most direct source not only of the atmospheric heat, but also of the atmospheric moisture. Therefore, land cover change will directly affect the surface-atmosphere interactions and further influence the atmospheric thermodynamic characteristics. The land use activities significantly changed the regional land cover and exerted great impacts on the climate system at regional scale, including temperature, evapotranspiration, precipitation, wind, and air pressure. The impacts of land cover change on climate can be divided into two major categories, that is, biogeochemical and biogeophysical impacts [2]. The biogeochemical processes mainly refer to greenhouse gas emissions caused by the land cover change, changing the
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