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Search Results: 1 - 10 of 23808 matches for " Yiping Zheng "
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Fabrication, Mechanical and Dielectric Characterization of 3D Orthogonal Woven Basalt Reinforced Thermoplastic Polyimide Composites  [PDF]
Shuna Hou, Jianfei Xie, Ye Kuang, Xianhong Zheng, Lan Yao, Yiping Qiu
Journal of Textile Science and Technology (JTST) , 2015, DOI: 10.4236/jtst.2015.11005
Abstract: The 3D orthogonal woven basalt fiber reinforced polyimide (PI) composites were fabricated and characterized in this study. The PI film was firstly prepared to determine PI processing parameters. Fourier transform infrared (FTIR) analysis showed that 300°C was the suitable imidization temperature. Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) results showed relatively good thermal properties of the PI film. In the fabrication of composites, the multi-step impregnation method was applied. The bending properties of 3 mm-thick composite showed increasing trend in all and the second-time impregnated composite had much higher value than the first-time impregnated composite. Moreover, the bending fracture mode photos showed obvious creases except for the first-time impregnated materials, which agreed well with the bending property values. The dielectric constants for the composites were complex because they had not regular value following the mixing rule of the composites, which was mainly due to the interfacial polarization and other effects in the fabrication processing.
CP embedding agent and its application to the serial section of the body wall tissue of insects
Xuexiang Bao,Yiping Zheng,Hengshan Zhang,Yingzhe Xia,Chuantao Song
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02886022
Abstract: The key of tissue section technique is the selection and application of the embedding agent. Based on the specific characteristics of the tissue and outer skeleton of insects, a new kind of embedding agent, colophony and paraffin (CP), was used without destroying the integrity of insect organs. The tissue can be sliced continuously by the use of CP embedding technique. It solves the 3 difficult problems in the serial section of the organ and tissue of insect, namely stiff materials, thin section and continuity of sections. These difficult problems are not solved by any unitary tissue section technique that is used now, including the paraffin section technique. By using the CP embedding technique, any parts or organs (like antenna, leg and wing) and even the whole body of insects (mini body) can be sliced up continuously. It will open up wide possibilities for the study of inner structure, the interrelations among organs, the micro-characteristics and the physiological functions of insects systematically.
Enhanced efficacy and specificity of epithelial ovarian carcinogenesis by embedding a DMBA-coated cloth strip in the ovary of rat
Huang Yiping,Jiang Wei,Wang Yisheng,Zheng Yufang
Journal of Ovarian Research , 2012, DOI: 10.1186/1757-2215-5-21
Abstract: Background Ovarian cancer is predominant of epithelial cell origin and often present at an advanced stage with poor prognosis. Most animal models of ovarian carcinoma yield thecal/granulose cell tumors, rather than adenocarcinomas. The best reported induction rate of adenocarcinoma in rats is 10-45% by an ovarian implantation of 7, 12-dimethylbenz[a]anthracene (DMBA) coated silk suture. We provided an improved procedure to construct the model by the ovarian implantation of DMBA-coated cloth strip. Methods A sterile suture (as S group) or a piece of cloth strip (as CS group) was soaked in DMBA before ovarian implantation in Wistar rats. Tumor size, incidence rate and pathological type were analyzed. Results Ovarian tumors in rats of CS group were first noted at 16 wk post implantation and reached a cumulative incidence of 75% (96/128) at 32 wk, while the tumor incidence rate in S group at 32 wk was only 46.25% (37/80). The tumor size in CS group (3.63 ± 0.89 cm) was larger than that of S group (2.44 ± 1.89 cm) (P < 0.05). In CS group, there were only two types of tumor formed: adenocarcinoma (90/96) and sarcoma (6/96). While in S group, there were different types, including adenocarcinoma (21/37), squamous carcinoma (3/37), granulosa cell tumor (3/37), sarcoma (4/37), undifferentiated carcinoma with no adeno character (2/37), benign ovarian tumor (2/37), and malignant teratoma (1/37). Conclusion The model in our study yields much higher incidence and specificity of epithelial derived tumors and showed histological similarities to human ovarian cancers, which would be more suitable for therapeutic research.
The Relationship between TTF-1 Expression and EGFR Mutations in Lung Adenocarcinomas
Wan Shanzhi, Han Yiping, Huang Ling, Zheng Jianming, Li Qiang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0095479
Abstract: Objective To explore the relationship between TTF-1 and EGFR mutations in lung adenocarcinoma tissues to guide clinical treatment timely and effectively. Materials and Methods we collected 664 tissue samples from patients with histologically confirmed lung adenocarcinoma from May 2010 to April 2013. All tumor tissues were collected prior to administering therapy. TTF-1 was detected byimmunohistochemistry and EGFR mutations by DNA direct sequencing. Finally, the correlation between TTF-1 expression and the presence of EGFR mutations was analyzed using χ2 test or Fisher’s exact test with SPSS software version 18.0. Results Of the 664 lung adenocarcinoma tissue samples, 18 were partially positive for TTF-1 (+?), and 636 were positive for TTF-1 (+) resulting in a total positive rate of 98.49% (+,+?)(including partial positive). In only 10 cases was the TTF-1 negative (?); the negative rate was 1.51%. There were 402 cases without an EGFR mutation and 262 cases with EGFR mutations; the rate of mutations was 39.46%. The location of the EGFR mutation was exon 19 for 121 cases resulting in a mutation rate in exon 19 of 18.22%. The location of the EGFR mutation was exon 21 for 141 cases resulting in a mutation rate in exon 21 of 21.23%. Exon 18 and 20 detected by DNA direct sequencing no mutations.A Fisher’s exact test was used to determine the correlation between EGFR mutations and TTF-1 expression.for the whole, TTF-1 positive expression(including partial positive) has correlation with EGFR mutations (p<0.001),especially for Exon 21 expression,the correlation is significant (p = 0.008). Conclusion In lung adenocarcinomas, positive and partial positive TTF-1 expression has a significant positive correlation with EGFR mutations(exon 19 and 21). In clinical practice, TTF-1 expression combine with EGFR mutations, especially exon 21 mutation can guide clinical treatment timely for lung adenocarcinomas.
Detecting Priming News Events
Di Wu,Yiping Ke,Jeffrey Xu Yu,Zheng Liu
Computer Science , 2012,
Abstract: We study a problem of detecting priming events based on a time series index and an evolving document stream. We define a priming event as an event which triggers abnormal movements of the time series index, i.e., the Iraq war with respect to the president approval index of President Bush. Existing solutions either focus on organizing coherent keywords from a document stream into events or identifying correlated movements between keyword frequency trajectories and the time series index. In this paper, we tackle the problem in two major steps. (1) We identify the elements that form a priming event. The element identified is called influential topic which consists of a set of coherent keywords. And we extract them by looking at the correlation between keyword trajectories and the interested time series index at a global level. (2) We extract priming events by detecting and organizing the bursty influential topics at a micro level. We evaluate our algorithms on a real-world dataset and the result confirms that our method is able to discover the priming events effectively.
Influence of acid deposition on atmospheric corrosion of zinc
Zheng Yiping,Wang Zhenyao,Zhang FengqiuInstitute of Corrosion,Protection of Metals,Academia Sinica,Shenyang,China,
Zheng Yiping
,Wang Zhenyao,Zhang Fengqiu

环境科学学报(英文版) , 1991,
Abstract: Site exposure tests both open and sheltered have been carried out in acid deposition area in Southwest China. Results from six sites show that acid deposition exerts a great influence on atmospheric corrosion of Zn, and it is more serious in wet condition. Basically, Zn corrosion is directly proportional to time of exposure. While SO2 is the main pollutant of the atmosphere environment, Zn corrosion has a linear relationship to SO2 depositing rate and a hyperbolic to rain pH value.Observations by SEM, EDAX and X-ray diffraction show that under sheltered exposure condition, the corrosion products of Zn in heavy acid deposition area principally are sulphates.Based on the corrosion rates measured, the working life of galvanized steel can be predicated.
Two tyrosines in CD3s-ITAM are required to induce T lymphocyte apoptosis
Dexian Zheng,Yiping He,Yanxin Liu,Yong Zheng,Sheng Xiao,Yin Liu,Shilian Liu
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02884129
Abstract: CD3ε of T cell antigen receptor complex (TCR/CD3) plays an important role in the resembling of the complex and activation signaling through its conservative immunoreceptor tyrosine-based activation motif (ITAM) in the cytoplasmic tall. Previous study showed that a chimera molecule, consisting of the extracellular-transmembrane domain of human CD8α fused to the cytoplasmic domain of CD3ε, induced apoptosis of T lymphocytes, indicating that apoptotic signals were transduced through the CD3ε-ITAM. To elineate involvement of the two tyrosines in apoptotic signaling pathway, cDNAs with mutations at Y170F, Y181F and Y170F/Y181F in CD8ε-ITAM were made by point mutation and PCR, and then cloned into pcDNA3 eukaryotic expression vectors. Stable expression cell lines were established after transfection of the expression vectors into CD8- Jurkat T lymphocytes. Stimulation of these cell lines with anti-CD8 monoclonal antibody showed that only the cells with expression of wild type chimera CD8-ε died by apoptosis, but not those cells with expressions of mutated CD8-ε chimera, indicating that the two tyrosines in CD3ε-ITAM were required for the apoptotic signal transduction in T lymphocytes.
Hierarchical Modeling by Recursive Unsupervised Spectral Clustering and Network Extended Importance Measures to Analyze the Reliability Characteristics of Complex Network Systems  [PDF]
Yiping Fang, Enrico Zio
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.31A010
Abstract:

The complexity of large-scale network systems made of a large number of nonlinearly interconnected components is a restrictive facet for their modeling and analysis. In this paper, we propose a framework of hierarchical modeling of a complex network system, based on a recursive unsupervised spectral clustering method. The hierarchical model serves the purpose of facilitating the management of complexity in the analysis of real-world critical infrastructures. We exemplify this by referring to the reliability analysis of the 380 kV Italian Power Transmission Network (IPTN). In this work of analysis, the classical component Importance Measures (IMs) of reliability theory have been extended to render them compatible and applicable to a complex distributed network system. By utilizing these extended IMs, the reliability properties of the IPTN system can be evaluated in the framework of the hierarchical system model, with the aim of providing risk managers with information on the risk/safety significance of system structures and components.

INFLUENCE OF ANHARMONIC VIBRATION ON SURFACE ENERGY OF NANOMETER Ag PARTICLES
非简谐振动对纳米Ag微粒表面能的影响

ZHENG Ruilun,LIANG Yiping,
郑瑞伦
,梁一平

材料研究学报 , 1997,
Abstract: The fusing temperature of nanometer Ag particle has ben measured,and the surface energy of Parable with varied radius has hen obtained in the paper.By applying of solid theory,the law of surface energy varying with the particle radius and the temperature has been proals from the angle of microcosmic and the effect of atom's unharmonic vibration on them has also been discusal.The results show that the effect of unharmonic vibration of atom makes a great deal of contribution to the surface energy of nanometer Ag particle.
A PRELIMINARY STUDY ON THE OVIDUCTAL CYTOKINES IN CONTROLLING THE DEVELOPMENT OF MAMMALIAN EARLY EMBRYOS
推进早期胚胎发育正常调控过渡的输卵管细胞因子的初步研究

Li Yiping,Shen Hong,Gu Zheng,Zuo Jiake,
李逸平
,沈虹

动物学研究 , 1997,
Abstract: 本研究对勉输卵管上皮细胞分泌蛋白的特征及功能能作了初步研究和分析。ROSs分子量介于135-44kD,可分为3组,其中第2,3组为酸性糖蛋白。经糖苷酶消化,第3组ROPS显著地降解为分子量接近30kD的蛋白。利用制备的抗总ROPs多抗以及针对不同分子量ROP的抗血清,分别进行功能分析发现,Arop-T和Arop-Ⅰ能使受精卵发育完全阻断.
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