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Search Results: 1 - 10 of 80957 matches for " Juanjuan Liu "
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Comprehensive Benefit Analysis of Direct Expansion Ground Source Heat Pump System  [PDF]
Yuefen Gao, Yingxin Peng, Juanjuan Liu
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.52A009
Abstract:

Direct Expansion Ground Source Heat Pump (DXGSHP) system directly extracts heat or cold energy from ground by consuming electricity to provide for space conditioning. Compared with the currently widely-used secondary loop Ground Couple Heat Pump (GCHP) system, it has higher energy efficiency, lower operating costs, and less environmental impact. A case study is carried out in this paper. The subject is a residential building located in Beijing, China. It is assumed that the building adopts the DXGSHP system and the GCHP system respectively. Annual loads and energy consumption are simulated and computed. Then the initial cost, operating cost and CO2 emission are calculated. The economic benefit is analyzed with the Payback Time method and the Dynamic Annual Cost Value method. The environmental benefit is discussed mainly by comparing the CO2 emission savings. The results show that the DXGSHP system has higher initial costs, but lower operating costs, and less greenhouse gas emissions. The DXGSHP system has better comprehensive benefits than the GCHP system.

The Factors on Removal of Zinc Cation from Aqueous Solution by Bentonite  [PDF]
Shuli Ding, Juanjuan Shen, Bohui Xu, Qinfu Liu, Yuzhuang Sun
Natural Resources (NR) , 2011, DOI: 10.4236/nr.2011.22015
Abstract: The removing zinc cation from aqueous solution by Ca-bentonite and Na-exchanged bentonite was studied. The factors such as the initial concentration of Zn2+, the liquid-to-solid ratio, pH, adsorption time, stirring speed, coexisting ions, temperature and bentonite particle size were investigated. The results show that the adsorption process of bentonite accorded with the Freundlich isotherm model, the removal of Zn2+ by Ca-bentonite and Na-exchanged bentonite reached equilibrium in 2 h, and adsorption of Na- bentonite was superior to Ca-bentonite. The adsorption rate of zinc increased with increasing pH, temperature, stirring speed, time span and with decreasing bentonite particle, the initial concentration of Zn2+ and the liquid-to-solid ratio. In mixed solution which contains Pb2+and Cr6+, Pb2+ has no influ- ence on the removal of Zn2+ by both the bentonites while Cr6+can decease it.
Commentary on Impression Management and Its Relative Research
印象管理及其相关研究述评

Liu Juanjuan,
刘娟娟

心理科学进展 , 2006,
Abstract: These years,impression management has increasingly drawn attention to sociology and psychology.It has become an important research variable.This paper reviewed the origin of the conception of impression management and its progress, introduced the status of oversea and domestic research,gave a commentary on prevenient research and make prospect for the future.It offers a new way for our country to make more research on impression management.
Distance-Dependent Filtering in a 4DVar Based on Historical Forecast Ensemble
基于历史预报的四维变分资料同化(4DVar)方法中的滤波

Liu Juanjuan,
刘娟娟

气候与环境研究 , 2011,
Abstract: An economical approach to implement the variational data assimilation(4Dvar) using the technique of Historical Sample Projection(HSP) is proposed,it is based on dimension reduction using an ensemble of historical samples to define a subspace,directly obtains an optimal solution in the reduced space and does not require implementation of the adjoint of tangent linear approximation.But the ensemble is composed of far fewer members than both the number of observational data and the degrees of freedom of the mo...
The Structure of Background-error Covariance in a Four-dimensional Variational Data Assimilation System: Single-point Experiment

Juanjuan Liu,Bin Wang,Shudong Wang,

大气科学进展 , 2010,
Abstract: A four dimensional variational data assimilation (4DVar) based on a dimension-reduced projection (DRP-4DVar) has been developed as a hybrid of the 4DVar and Ensemble Kalman filter (EnKF) concepts. Its good flow-dependent features are demonstrated in single-point experiments through comparisons with adjoint-based 4DVar and three-dimensional variational data (3DVar) assimilations using the fifth-generation Pennsylvania State University-National Center for Atmospheric Research Mesoscale Model (MM5). The results reveal that DRP-4DVar can reasonably generate a background error covariance matrix (simply B-matrix) during the assimilation window from an initial estimation using a number of initial condition dependent historical forecast samples. In contrast, flow-dependence in the B-matrix of MM5 4DVar is barely detectable. It is argued that use of diagonal estimation in the B-matrix of the MM5 4DVar method at the initial time leads to this failure. The experiments also show that the increments produced by DRP-4DVar are anisotropic and no longer symmetric with respect to observation location due to the effects of the weather trends captured in its B-matrix. This differs from the MM5 3DVar which does not consider the influence of heterogeneous forcing on the correlation structure of the B-matrix, a condition that is realistic for many situations. Thus, the MM5 3DVar assimilation could only present an isotropic and homogeneous structure in its increments.
HSV-2 Increases TLR4-Dependent Phosphorylated IRFs and IFN-β Induction in Cervical Epithelial Cells
Hongya Liu, Kai Chen, Wenqiang Feng, Juanjuan Guo, Hui Li
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0094806
Abstract: Our previous studies demonstrated that HSV-2 infection up-regulates TLR4 expression and induces NF-kB activity, thereby facilitating innate immune response in human cervical epithelial cells. This process requires involvement of TLR4 adaptors, Mal and MyD88. In the current study, we found that HSV-2 infection increases levels of phosphoryalted IRF3 and IRF7, then regulating expression of type I IFN. As expected, these changes induced by HSV-2 infection depended upon TLR4. Knockdown of TRIF and/or TRAM by siRNAs indicated that TRIF/TRAM might be involved in expression of IFN-β. Our results demonstrate for the first time that IRF3 and IRF7 are both involved in inducing TLR4-dependent IFN-β expression in response to HSV-2 in its primary infected genital epithelial cells. Thus, TLR4-Mal/MyD88 and TLR4-TRIF/TRAM signaling may synergize and/or cooperate in innate immune response of cervical epithelial cells to HSV-2 infection.
Genes Responsive to Elevated CO2 Concentrations in Triploid White Poplar and Integrated Gene Network Analysis
Juanjuan Liu, Jianguo Zhang, Caiyun He, Aiguo Duan
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0098300
Abstract: Background The atmospheric CO2 concentration increases every year. While the effects of elevated CO2 on plant growth, physiology and metabolism have been studied, there is now a pressing need to understand the molecular mechanisms of how plants will respond to future increases in CO2 concentration using genomic techniques. Principal Findings Gene expression in triploid white poplar ((Populus tomentosa ×P. bolleana) ×P. tomentosa) leaves was investigated using the Affymetrix poplar genome gene chip, after three months of growth in controlled environment chambers under three CO2 concentrations. Our physiological findings showed the growth, assessed as stem diameter, was significantly increased, and the net photosynthetic rate was decreased in elevated CO2 concentrations. The concentrations of four major endogenous hormones appeared to actively promote plant development. Leaf tissues under elevated CO2 concentrations had 5,127 genes with different expression patterns in comparison to leaves under the ambient CO2 concentration. Among these, 8 genes were finally selected for further investigation by using randomized variance model corrective ANOVA analysis, dynamic gene expression profiling, gene network construction, and quantitative real-time PCR validation. Among the 8 genes in the network, aldehyde dehydrogenase and pyruvate kinase were situated in the core and had interconnections with other genes. Conclusions Under elevated CO2 concentrations, 8 significantly changed key genes involved in metabolism and responding to stimulus of external environment were identified. These genes play crucial roles in the signal transduction network and show strong correlations with elevated CO2 exposure. This study provides several target genes, further investigation of which could provide an initial step for better understanding the molecular mechanisms of plant acclimation and evolution in future rising CO2 concentrations.
Z Draconis with two companions in a 2:1 mean-motion resonance
Jinzhao Yuan,Hakan Volkan Senavci,Shengbang Qian,Juanjuan Liu
Physics , 2014,
Abstract: All available mid-eclipse times of the eclipsing binary Z Draconis are analysed, and three sets of cyclic variations with periods of 20.1, 29.96 and 59.88 yr are found. The low-amplitude variations with the period of 20.1 yr may be attributed to the unavoidable and slight imperfection in the double-Keplerian model, which gives the periods of 29.96 and 59.88 yr. Interestingly, the Z Draconis system is close to a 2:1 mean-motion resonance, or 6:3:2 mean-motion resonance if the period of 20.1 yr is true. We also find that the best solutions tend to give the minimum eccentricities. Based on Kepler's third law, the outermost companion has the minimum mass of $\sim0.77M_{\bigodot}$, whereas the middle companion is an M dwarf star with a mass of $\sim0.40M_{\bigodot}$, suggesting that Z Draconis is a general N-body system.
The Pathogenicity of Chicken Pathogenic Escherichia coli Is Associated with the Numbers and Combination Patterns of Virulence-Associated Genes  [PDF]
Jingyu Wang, Pan Tang, Dan Tan, Liqin Wang, Sandong Zhang, Yuanhao Qiu, Rui Dong, Wanhua Liu, Jingjing Huang, Ting Chen, Juanjuan Ren, Cengshan Li, Hung-Jen Liu
Open Journal of Veterinary Medicine (OJVM) , 2015, DOI: 10.4236/ojvm.2015.512033
Abstract: Various virulence-associated genes or pathogenicity island are responsible for determining the pathogenicity of Escherichia coli strains. However, the correlation of the number and combination patterns of virulence-associated genes in Escherichia coli strains with their pathogenicity remains largely unknown. In this work, 581 chicken Escherichia coli strains were isolated from 1045 liver samples of dead chickens from 50 chicken farms at four provinces in China during 2007-2012. Based on the pathogenic test of SPF chickens, 320 chickens pathogenic Escherichia coli isolates were identified as highly (n = 193), intermediate (n = 98) and low pathogenic (n = 29) strains, respectively. Furthermore, the number of virulence genes in the 320 chicken pathogenic and 50 non-pathogenic Escherichia coli strains was examined. Our results reveal that thirteen virulence genes in Escherichia coli strains were detected, and all strains carried at least two or more than two virulence-associated genes. This study also suggests that highly pathogenic E. coli strains simultaneously carried at least 8 to13 virulence genes while intermediate pathogenic strains carried at least 5 to 8 virulence genes. The number of virulence-associated genes detected in highly pathogenic strains showed there were more significant differences than that in low pathogenic strains (P < 0.01). The detection rate of genes irp2, fyuA, and colV in high pathogenic strains was significantly higher than that in low and non-pathogenic strains (P < 0.01). Nine virulence-associated genes irp2, fyuA, iucA, iucD, iutA, papC, iss, tsh, and colV were more often detected in highly and intermediate pathogenic E. coli strains. Taken together, our results provide evidences demonstrating that the pathogenicity of Escherichia coli strains is closely associated with the number and combination patterns of virulence-associated genes.
The Stimulation of IGF-1R Expression by Lewis(y) Antigen Provides a Powerful Development Mechanism of Epithelial Ovarian Carcinoma
Dawo Liu,Juanjuan Liu,Changzhi Wang,Bei Lin,Qing Liu,Yingying Hao,Shulan Zhang,Masao Iwamori
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12106781
Abstract: Objective: This study aimed to measure and correlate the expression of insulin-like growth factor receptor-1 (IGF-1R) and the Lewis(y) antigen in ovarian cancer cell lines and tissue samples. Methods: Reverse transcriptase PCR (RT-PCR), Western blotting, immunoprecipitation, immunohistochemistry, and immunofluorescence double-labeling techniques were applied to detect and measure the expression of Lewis(y) and IGF-1R. Results: In α1,2-fucosyltransferase (α1,2-FT)-transfected cells, IGF-1R expression was significantly upregulated compared with cells that do not overexpress α1,2-FT ( P < 0.05). The amount of Lewis(y) expressed on IGF-1R increased 1.81-fold in α1,2-FT-overexpressing cells ( P < 0.05), but the ratio of Lewis(y) expressed on IGF-1R to total IGF-1R was unaltered between two cells ( P > 0.05). In malignant epithelial ovarian tumors, the positivity rates of Lewis(y) and IGF-1R detection were 88.3% and 93.33%, respectively, which is higher than the positivity rates in marginal (60.00% and 63.33%, all P < 0.05), benign (33.00% and 53.33%, all P < 0.01), and normal (0% and 40%, all P 0.05). Both IGF-1R and Lewis(y) were highly expressed in ovarian cancer tissues, and their expression levels were positively correlated ( P < 0.05). Conclusion: Overexpression of Lewis(y) results in overexpression of IGF-1R. Both IGF-1R and Lewis(y) are associated with the occurrence and development of ovarian cancers.
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