检索结果-南通市图书馆

Increased expression of angiogenin in gastric carcinoma in correlation with tumor angiogenesis and proliferation

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第32期12卷 5135-5139页

作者： yu Chen Sheng Zhang yu-peng Chen Jian-Yin Lin Department of Physiology and Pathophysiology Fujian Medical Oniversity Fuzhou 350004 Fujian Province China Department of Pathology The First Affiliated Hospital of Fujian Medical University Fuzhou350004 Fujian Province China Department of Biochemistry and Molecular Biology Fujian Medical University Fuzhou 350004 Fujian ProvinceChina

AIM： To investigate the implication of angiogenin （ANG） in the neovascularizaton and growth of human gastric carcinoma （HGC）. METHODS： ANG mRNA expression in HGC specimens obtained by surgical resection from patients with HGC were examined by RT-PCR. ANG, Ki-67, VEGF protein expression and microvessel density （MVD） in HGC specimens were detected by immunohistochemistry. RESULTS： RT-PCR showed significantly higher ANG mRNA expression （0.482 ± 0.094） in HGC tissues than in the surrounding nontumorous tissues （0.276 ±0.019, P = 0.03）. MVD within tumorous tissues increased significantly with ANG mRNA expression （r = 0.380, P = 0.001） and ANG protein expression （P 〈 0.01）. The ANG expression levels of cancer tissues were positively correlated with VEGF （P 〈 0.01） and the proliferation index of cancer cells （P 〈 0.01）. CONCLUSION： ANG is one of the neovascularization factors of HGC. ANG may work in coordination with VEGF, and promote the proliferation of HGC cells.

关键词： Angiogenin Gastric carcinoma Vascular endothelial growth factor Angiogenesis

A novel adaptive modulation and coding strategy based on partial feedback for enhanced MBMS network

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2008年第1期15卷 48-54页

作者： SHENG yu peng Mu-gen WANG Wen-bo School of Telecommunications Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

The difference in link condition of broadcast/ multicast users and the limitation of uplink resource, make it difficult to utilize adaptive modulation and coding （AMC） in the enhanced multimedia broadcast and multicast service （E-MBMS） network. To obtain the improvement of system throughput, this study proposes an adaptive modulation and coding scheme based on partial feedback, by which only partial users whose channel qualities are lower than the system threshold need to make a response to the modulation coding scheme （MCS） adaptation procedure. By this investigation, an adaptive scheme can be introduced in the E-MBMS network. Both the theoretical analysis and simulation results demonstrate the efficiency of the proposed strategy, in which the performance is close to the ideal one and has a significant throughput improvement when compared with that of the fixed MCS transmission scheme.

关键词： E-MBMS partial feedback AMC system throughput

Preliminary results of solving the problem of geometric distortion for the 2.4 m telescope at yunnan Observatory

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第10期12卷 1451-1456页

作者： Qing-Feng Zhang Qing-yu peng Zi Zhu Department of Computer Science Jinan University Guangzhou 510632 China Key Laboratory of Modem Astronomy and Astrophysics (Nanjing University) Ministry ofEducation Nanjing 210032 China Sino-French Joint Laboratory for Astrometry Dynamics and Space Science Jinan UniversityGuangzhou 510632 China

We observed the open clusters NGC 1664 （43 exposures） and M35 （42 ex- posures） by the yunnan Faint Object Spectrograph and Camera in the 2.4 m telescope at yunnan Astronomical Observatory on 2011 January 3, and processed them by a method recently proposed by us. The result shows that there is a geometric distortion effect in the field of view and the maximum distortion is - 0.25 （i.e. 1 pixel）. After correcting the geometric distortion, the precision of stellar positional measurement is significantly improved. The best precision in each direction is 6 mas for well-exposed stars.

关键词： astrometry -- methods: data analysis -- techniques: image processing

Climatologic comparison of HadISST1 and TMI sea surface temperature datasets

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2011年第8期54卷 1238-1247页

作者： WANG yu LIU peng LI TianYi FU yunFei Laboratory of Atmospheric Observation and Climatological Environment School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China

Two monthly datasets of sea surface temperature (SST),TMI SST retrieved from satellite observations by Remote Sensing System and HadISST1 (Hadley Centre Sea-ice and Sea-surface Temperature Data Set Version 1) derived from in situ measurements by Hadley Centre,were compared on climatologic multiple time scales over tropical and subtropical areas from 1998 to *** indicate that there is a good consistency in the horizontal global distribution,with 1.0° resolution on multi-year and multi-season mean scales between the two datasets,and also in the time series of global mean SST ***,there are still some significant differences between the ***,TMI SST is relatively higher than *** addition,the differences between the two datasets show not only remarkable regionality,but also distinct seasonal ***,the maximum departure occurs in summer,while theminimum takes place in *** all seasons,over 30% of the regions in the Tropical and Subtropical areas have a difference of more than 0.3°*** analysis of the SST anomaly field also shows that there are differences between the two datasets,where HadISST1 has more significant statistical characteristics than TMI *** the other hand,results show that the difference between the two datasets is related to the vertical structure of ocean temperatures,as well as other simultaneously retrieved parameters in TMI products,such as wind speed,water vapor,liquid cloud water and rain *** addition,large biases between HadISST1 and TMI SST are found in coastal regions,where TMI SST cannot be accurately retrieved because of polluted microwave signals.

关键词： sea surface temperature HadISST1 TMI EOF analysis

Effectiveness of urban distributed runoff model for discharge and water depth calculation in urban drainage pipe networks

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2024年第3期36卷 582-591页

作者： Yang Zhou Yi-ling Leng peng-yu Wang Shang-hong Zhang yu-long Zhu yu-jun Yi School of Water Resources and Hydropower Engineering North China Electric Power UniversityBeijing102206China State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing100875China

Effective urban land-use re-planning and the strategic arrangement of drainage pipe networks can significantly enhance urban flood defense *** at reducing the potential risks of urban flooding,this paper presents a straightforward and efficient approach to an urban distributed runoff model(UDRM).The model is developed to quantify the discharge and water depth within urban drainage pipe networks under varying rainfall intensities and land-use *** Nash efficiency coefficient of UDRM exceeds 0.9,which indicates its high computational efficiency and potential benefit in predicting urban *** prediction of drainage conditions under both current and re-planned land-use types is achieved by adopting different flood recurrence *** findings reveal that the re-planned land-use strategies could effectively diminish flood risk upstream of the drainage pipe network across 20-year and 50-year flood recurrence ***,in the case of extreme rainfall events(a 100-year flood recurrence),the re-planned land-use approach fell short of fulfilling the requirements necessary for flood disaster *** these instances,the adoption of larger-diameter drainage pipes becomes an essential requisite to satisfy drainage ***,the proposed UDRM effectively combines land-use information with pipeline data to give practical suggestions for pipeline modification and land-use optimization to combat urban ***,this methodology warrants further promotion in the field of urban re-planning.

关键词： Stormwater runoff water depth urban distributed runoff model urban drainage pipe networks urban land-use re-planning

Ileum terminal antibiotic infusion affects jejunal and colonic specific microbial population and immune status in growing pigs

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2018年第4期9卷 925-936页

作者： Chuanjian Zhang yu peng Chunlong Mu Weiyun Zhu Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health Laboratory of Gastrointestinal Microbiology College of Animal Science and Technology Nanjing Agricultural University National Center for International Research on Animal Gut Nutrition

Background: Compared with oral antibiotics(primarily disrupt foregut microbiota), the present study used antibiotics with ileum terminal infusion to disrupt the hindgut microbiota, and investigated the changes in specific bacterial composition and immune indexes in the jejunum and colon, and serum of growing pigs. Twelve barrows(45 d of age, 12.08 ± 0.28 kg) fitted with a T-cannula at the terminal ileum, were randomly assigned to two groups and infused either saline without antibiotics(Control) or with antibiotics(Antibiotic) at the terminal ileum. After 25 d experiment, all pigs were euthanized for analyzing bacterial composition and immune ***: Ileum terminal antibiotic infusion(ITAI) altered dominant bacteria counts, with a decrease in Bifidobacterium, Clostridium cluster IV and Clostridium cluster IV in the colon(P < 0.05), and an increase in Escherichia coli in the jejunum(P < 0.05). ITAI decreased(P < 0.05) short-chain fatty acids concentrations in the colon. ITAI decreased interleukin-8(IL-8), IL-10 and secretory immunoglobulin A(sIgA) concentrations, and down-regulated IL-10, Mucin-1(MUC1), Mucin-2(MUC2) and zonula occludens-1(ZO-1) mRNA expression in the colonic mucosa(P < 0.05). In the jejunal mucosa, ITAI decreased interferon-γ(IFN-γ), tumor necrosis factor-α(TNF-α), s IgA and IgG levels together with down-regulation of IFN-γ, TNF-α, MUC2 and ZO-1 mRNA expression(P < 0.05). Furthermore, ITAI decreased IL-10, INF-γ, TNF-α, IgA and IgG concentrations in serum(P < 0.05). Correlation analysis revealed that the change in intestinal microbiota was correlated with alterations of Ig and ***: ITAI affected jejunal and colonic specific bacteria counts, and altered some immune markers levels in the jejunal and colonic mucosa and serum. These findings implicate the potential contribution of hindgut bacteria to immune response in the intestinal mucosa and serum of growing pigs.

关键词： Antibiotic infusion Growing pigs Gut bacteria Immune status Short-chain fatty acids

Optimized damping for LCL filters in three-phase voltage source inverters coupled by power grid

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2017年第4期5卷 642-651页

作者： Meng HUANG Jianjun SUN yu peng Xiaoming ZHA Wuhan University WuhanChina Wuhan Electric Power Technical College WuhanChina

The application of LCL filters has become popular for inverters connected to the power grid due to their advantages in harmonic current reductions. However,the power grid in a distribution system is non-ideal, presenting itself as a voltage source with significant impedance. This means that an inverter using an LCL filter may interact with other grid-connected inverters via the nonideal grid. In this paper, damping optimization of LCLfilters to reduce this interaction is studied for a three-phase voltage source inverter(VSI). Simulation results show that resonant oscillation occurs in a distributed power grid, even if the VSI with an LCL filter is well designed for standalone applications. A small-signal analysis is performed to predict this stability problem and to locate the boundary of the instability using an impedance approach. Based on these analytical results, optimized damping of the LCLfilter can be designed. The oscillation phenomena and optimized damping design are verified by simulations and experimental measurements.

关键词： LCL filter Three-phase voltage source inverter Non-ideal power grid Optimized design Interacting converters

Rapid Hydrothermal Synthesis of Submillimeter Ultralong Flexible Hydroxyapatite Fiber Using Different pH Regulators

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2016年第7期29卷 609-613页

作者： Mei-li Qi Gui-yong Xiao yu-peng Lu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong University School of Materials Science and Engineering Shandong University

Hydroxyapatite fiber （HAF） was fabricated via a one-step hydrothermal route by using urea （CA）, acetamide （AA） and propanamide （PA） as pH regulators, respectively, and the reaction time was only 0.5 h. The HAF synthesized by CA as the pH regulator was agglomerated with irregular morphology, while using AA or PA as the pH regulator, the HAF was composed of well-dispersed fibers with lengths larger than 200 pm. Two different morphologies form mainly due to the different hydrolysis rates of the pH regulators. Most of the fibers synthesized by the three pH regulators showed curving appearance, implying their outstanding flexibility. The technique in this paper allows the rapid formation of flexible HAF and may have wider applications in the restorations and reinforcement composites.

关键词： Hydroxyapatite Fiber Hydrothermal PH regulators

A Distributed Cell Outage Compensation Mechanism Based on RS Power Adjustment in LTE Networks

在线全文

学校读者我要写书评

暂无评论

China Communications 2014年第A1期11卷 40-47页

作者： LI Wenjing yu peng YIN Mengjun MENG Luoming StateKeyLaboratoryofNetworkingandSwitchingTechnology BeijingUniversityofPostsandTelecommunicationsBeijing100876China

To solve the coverage and quality problems caused by cell outage in LTE networks, this paper proposes a distributed self-organizing networks management architecture and a distributed cell outage compensation management mechanism. After detecting and analyzing the outage, a cell outage compensation algorithm based on reference signal power adjustment is proposed. The simulation results show that the proposed mechanism can mitigate the performance degradation significantly. Compared with other algorithms, the proposed scheme is more effective in compensating the coverage gap induced by cell outage

关键词： LTE cell outage compensation (COC) reference signal power PSO