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Search Results: 1 - 10 of 328216 matches for " Han Chen;Yang Ding;De Shui Cai "
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A CPW-FED UWB Antenna with Wimax/WLAN Band-Notched Characteristics
Han Chen;Yang Ding;De Shui Cai
PIER Letters , 2011, DOI: 10.2528/PIERL11062707
Abstract: A CPW-fed UWB antenna with WiMAX and WLAN band-notched characteristics is presented in this paper. The proposed antenna is fed by a CPW structure and provides the band-notched characteristics by etching an arc slot on the monopole plate and integrating the antenna with electromagnetically coupled microstrip resonator into a single module. In order to prevent interference problem due to existing nearby communication systems within the UWB operating frequency, the two band-notches are designed to reject possible interference with the existing 3.25-3.75 GHz band for IEEES02.16 WiMAX and 5.15-5.825 GHz band for IEEES02.11a WLAN and HIPERLAN/2 WLAN The two notched bands can easily be controlled by a few geometry parameters of the arc slot and the microstrip resonator. Surface current distributions and conceptual equivalent-circuit models are used to analyze the effect of the slot and the resonator. The proposed antenna is simulated and fabricated. Moreover, the performances of the antenna are demonstrated along with simulated and measured results.
Crossed Oval-Ring Slot Antenna with Triple-Band Operation for WLAN/Wimax Applications
De Shui Cai;Zhen-Ya Lei;Han Chen;Gao-Li Ning;Rong Bing Wang
PIER Letters , 2011, DOI: 10.2528/PIERL11092810
Abstract: This paper presents the design of a crossed oval-ring microstrip slot antenna to achieve triple-frequency operation for WLAN/WiMAX applications. The proposed antenna is composed of a rectangular microstrip feed line and a ground plane on which three crossed oval-ring slots are etched. The three crossed slot loops finally excite three resonant modes and the resonant frequencies of the proposed antenna are mainly controlled by the dimensions and locations of the slot loops. The antenna prototype is fabricated and the characteristics are experimentally verified. The measured impedance bandwidths for triple operating bands can reach 840/670/940 MHz with return losses larger than 10 dB, which is enough for WLAN/WiMAX communication. In addition, good radiation characteristics with moderate peak gains are obtained and the measured and simulated results show a good agreement.
Transcriptomic Characterization of Hepatocellular Carcinoma with CTNNB1 Mutation
Xiao Ding, Yuan Yang, Baoda Han, Chengzhi Du, Naiqing Xu, Huanwei Huang, Tao Cai, Aiqun Zhang, Ze-Guang Han, Weiping Zhou, Liang Chen
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0095307
Abstract: Purpose Hepatocellular carcinoma (HCC) is the sixth most common solid tumor worldwide and the third leading cause of cancer-related death. HCC is a particularly serious threat to the Chinese population. Although many molecular alterations are known to be involved in the tumorigenesis of hepatocytes, no systemic survey has examined the somatic mutations in HCC samples from Chinese patients. Our goal was to elucidate somatic mutations in Chinese HCC patients and investigate the possible molecular mechanisms involved in tumorigenesis. Experimental Design A total of 110 hepatitis B virus (HBV)-positive HCC samples and 46 HBV-negative HCC samples were genotyped for hot-spot mutations in the CSF1R, CTNNB1, KRAS, BRAF, NRAS, ERBB2, MET, PIK3CA, JAK1, and SMO genes. The transcriptomes of the CTNNB1 mutation-positive HCC samples from the HBV-positive patients (CB+ HCC) were compared to adjacent non-cancerous livers, and significantly altered genes were functionally validated in vitro. Results CTNNB1 mutations accounted for the majority of the mutations detected in our study. A slightly higher mutation rate was found in the HBV-positive patients than in their negative counterparts. A distinct pattern of CTNNB1 mutation was detected in these two populations, and drastic changes at the transcriptomic level were detected in the CB+ tumors compared to adjacent non-cancerous livers. Potential tumor suppressors (FoxA3 and Onecut1) and oncogenes (MAFG and SSX1) were functionally validated. Conclusions Our work is the first systemic characterization of oncogenic mutations in HCC samples from Chinese patients. Targeting the Wnt-β-catenin pathway may represent a valid treatment option for Chinese HCC patients. Our work also suggests that targeting ONECUT1, FOXA3, SSX1, and MAFG may be a valid treatment option for CTNNB1 mutation positive HCC patients.
First-principles study of electron field emission from the carbon nanotube with nitrogen doping and H2O adsorption
氮掺杂及水分子吸附碳纳米管电子场发射第一性原理研究

Chen Guo-Dong,Wang Liu-Ding,An Bo,Yang Min,Cao De-Cai,Liu Guang-Qing,
陈国栋
,王六定,安博,杨敏,曹得财,刘光清

物理学报 , 2009,
Abstract: 对闭口碳纳米管(CNT)顶端分层掺氮及吸附不同数目水分子体系,运用第一性原理研究了有电场存在时的电子场发射性能.结果表明:掺氮并吸附水分子的CNT结构稳定;外电场愈强、水分子数愈多,体系态密度(DOS)向低能端移动幅度愈大且最高分子占据轨道(HOMO)/最低分子空轨道(LUMO)能隙愈小.吸附能,DOS/LDOS,HOMO/LUMO及其能隙分析一致表明,第三层氮掺杂CNT吸附不同数目水分子体系的场发射性能最佳.
IMPACTS OF URBANIZATION ON THE WETLAND WATERBIRD COMMUNITIES IN HANGZHOU
城市化对杭州市湿地水鸟群落的影响研究

CHEN Shui Hua,DING Ping ZHENG Guang Mei ZHUGE Yang,
陈水华
,丁平

动物学研究 , 2000,
Abstract: The distribution and abundance of waterbirds on 6 kinds of wetlands in Hangzhou were surveyed between December in 1997 and November in 1998.Eleven habitat characteristics were selected to determine the factors influencing wetland waterbird communities,and urbanization synthetical index so as to explore the impacts of urbanization on the waterbird communities.Other than food,water pollution and water depth,the habitat characteristics of landscape level (wetland shape,percent of surrounding building,wetland connectivity,distance to city center) and disturbance (noise and human disturbance) also showed strong relationships with species distributions,densities or diversities.Diversity of food and human disturbance played the significant roles in determining the variety of waterbird species diversity all year round.Species density and diversity decreased with increasing urbanization.Although some species showed a little adaptation to urbanization,there was no real adapted species.
EXPERIMENTAL AND NUMERICAL SIMULATION ON FOUR-PORT GaAlAs/GaAs PLANAR WAVEGUIDE FILTERS WITH RING RESONATOR
环形谐振腔GaAlAs/GaAs四端口滤波器的仿真与实验研究

CAI Chun,LIU Xu,XIAO Jin-Biao,DING Dong,ZHANG Ming-De,SUN Xiao-Han,XU Xiao-Le,CHEN Tang-Sheng,LI Fu-Xiao,
蔡纯
,刘旭,肖金标,丁东,张明德,孙小菡,徐筱乐,陈堂胜,李拂晓

红外与毫米波学报 , 2005,
Abstract: Based on the theory of four-port resonant filters, the characteristics of filters with ring resonators were numerically simulated by using two-dimensional FDTD method. The relationship between the coupling length of MMI and the filtering features was also simulated . Two narrow-band filters with ring resonators based on GaAlAs/GaAs planar waveguide were designed and fabricated. The measurement on filtering feature was carried out. It coincides well with that from the numeric computation.
A risk factor analysis of healthcare-associated fungal infections in an intensive care unit: a retrospective cohort study
Yang Su-Pen,Chen Yin-Yin,Hsu Han-Shui,Wang Fu-Der
BMC Infectious Diseases , 2013, DOI: 10.1186/1471-2334-13-10
Abstract: Background The incidence of fungal healthcare-associated infection (HAI) has increased in a major teaching hospital in the northern part of Taiwan over the past decade, especially in the intensive care units (ICUs). The purpose of this study was to determine the factors that were responsible for the outbreak and trend in the ICU. Methods Surveillance fungal cultures were obtained from “sterile” objects, antiseptic solutions, environment of infected patients and hands of medical personnel. Risk factors for comparison included age, gender, admission service, and total length of stay in the ICU, Acute Physiology and Chronic Health Evaluation (APACHE) II scores at admission to the ICU, main diagnosis on ICU admission, use of invasive devices, receipt of hemodialysis, total parenteral nutrition (TPN) use, history of antibiotic therapy before HAI or during ICU stay in no HAI group, and ICU discharge status (ie, dead or alive). Univariable analysis followed by multiple logistic regression analysis was performed to identify the independent risk factors for ICU fungal HAIs and ICU mortality. Results There was a significant trend in ICU fungal HAIs from 1998 to 2009 (P < 0.001). A total of 516 episodes of ICU fungal HAIs were identified; the rates of various infections were urinary tract infection (UTI) (54.8%), blood stream infection (BSI) (30.6%), surgical site infection (SSI) (6.6%), pneumonia (4.5%), other sites (3.5%). The fungi identified were: yeasts (54.8%), Candida albicans (27.3%), Candida tropicalis (6.6%), Candida glabrata (6.6%), Candida parapsilosis (1.9%), Candida species (0.8%), and other fungi (1.9%). Candida albicans accounted for 63% of all Candida species. Yeasts were found in the environment of more heavily infected patients. The independent risk factors (P < 0.05) of developing ICU fungal HAIs from all sites were TPN use, sepsis, surgical patients, mechanical ventilation and an indwelling urinary catheter. The independent risk factors for ICU fungal UTI included TPN use, mechanical ventilation and an indwelling urinary catheter. The independent risk factors for ICU fungal BSI included TPN use, sepsis, and higher APACHE II score. The independent risk factors for ICU fungal pneumonia included TPN use, surgical patients. The independent risk factors for ICU fungal SSI included surgical patients, and TPN use. The odds ratios of TPN use in various infection types ranged from 3.51 to 8.82. The risk of mortality in patients with ICU fungal HAIs was over 2 times that of patients without ICU HAIs in the multiple logistic regression analysis
Hypoxic and Highly Angiogenic Non-Tumor Tissues Surrounding Hepatocellular Carcinoma: The ‘Niche’ of Endothelial Progenitor Cells
De-Cai Yu,Jun Chen,Yi-Tao Ding
International Journal of Molecular Sciences , 2010, DOI: 10.3390/ijms11082901
Abstract: Our previous investigations showed that mobilized endothelial progenitor cells (EPCs) are enriched in non-tumor tissues (NT) surrounding hepatocellular carcinoma (HCC), compared to in tumor tissues (TT). This particular recruitment of EPCs is worth investigating further. The mobilization, recruitment, homing, and incorporation of EPCs into tumors require the participation of multiple factors, including angiogenic factors, adherent molecules, endothelial cells, hypoxic environment, etc. Therefore, we hypothesized that NT might be a hypoxic and highly angiogenic area, into which many more EPCs are recruited and homed. In the last three years, we evaluated the hypoxic condition, angiogenic factors and angiogenic index using frozen tissues or tissue microarrays from 105 patients who had undergone hepatectomy for HCC, and here we review our results and the studies of others. All results showed the expression of Hypoxia-inducible factor-1α was higher in NT than in TT. The expression of VEGFA, bFGF, TGF-β, MCP-1, MMP-9, TIMP-2, and endostatin in NT was significantly higher than in normal liver and TT. Meanwhile, the expression of CD105—the surface marker of activated endothelial cells—was also higher in NT than in TT at the protein and mRNA levels. These investigations showed that NT is a hypoxic and highly angiogenic area, which may be the ‘niche’ of EPCs. The particular background in HCC may be related to liver cirrhosis. Therefore, non-tumor tissues surrounding HCC may be the ‘niche’ of endothelial progenitor cells.
Research on Measurement of Realistic Planting Leaf Area Based on Machine Vision
基于机器视觉的现实叶片面积测量方法的研究

CHEN Ding-cai,WANG Ding-cheng,ZHA Jin-shui,
陈鼎才
,王定成,查金水

计算机应用 , 2006,
Abstract: Leaf area is a common criterion in some crop plantings, and it is also an evaluating criterion for quantities and qualities of crop products. But leaf images got from the real world often have some geometric distortion. Now the geometry correction to leaf images with perspective distortion was researched by knowledge of machine vision, and the objective is to make the corrected leaf images be close to the leaf images without geometric distortion as far as possible. Then the leaf area can be calculated with the math relations according to the statistic of goal pixel.
Comparing and analysing the control effect of several black and stinking rivers in Shanghai
上海市几条黑臭河道治理效果的比较与分析

WANG Ying-Cai,LIU Yong-Ding,HAO Zong-Jie,ZHANG Lan,SEEN Yin-Wu,LI Gen-Bao,LI Dun-Hai,CHEN De-Hui,MA Qing,YANG Hong-Fang,
王英才
,刘永定,郝宗杰,张兰,沈银武,李根保,李敦海,陈德辉,马庆,杨洪芳

水生生物学报 , 2009,
Abstract: 随着上海市经济的突飞猛进和城市化的日新月异,随之而来的城市水污染问题也愈演愈烈.据上海市2003年水资源公报反映:全市16条主要骨干河道中,Ⅱ、Ⅲ类水断面占13.11%,Ⅳ类水断面占28.17%,V类和劣于V类水断面占58.12%1].
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