检索结果-南通市图书馆

Geometry characteristics and wide temperature behavior of silicon-based GaN surface acoustic wave resonators with ultrahigh quality factor

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

Science China(Information Sciences) 2024年第2期67卷 267-278页

作者： Guofang YU Renrong LIANG haiming ZHAO Lei XIAO Jie CUI Yue ZHAO Wenpu CUI Jing WANG Jun xu Jun FU Tianling REN School of Integrated Circuits Tsinghua University Beijing National Research Center for Information Science Technology Tsinghua University

Surface acoustic wave(SAW) resonators with an ultrahigh Q-factor are designed and fabricated on silicon-based gallium nitride(GaN/Si). The temperature-dependent performance is characterized over a wide range, from 10 to 500 K. Finite element analysis is employed to guide the design of the SAW resonator from indications of the Rayleigh mode and weak propagation direction dependence of SAW in the c-plane of GaN/Si. The SAW resonator with 100 pairs of interdigital transducers(IDT), 100 pairs of grating reflectors(GR) for each side, aperture size of 80 μm, metallization ratio of 0.5, and electrode width of 500 nm resonates at 1.9133 GHz accordingly with an ultrahigh Q-factor of 7622 at room temperature, which contributes the fr× Qr, up to 14.583×1012Hz. A resonator operating over 10 to 500 K indicates an approximately linear decreasing temperature dependence above 280 K while being approximately constant below 40 K. The fitting to resonator characteristics using the modified Butterworth Van Dyke(m BVD) model reveals a reduction in both the electrode and mechanical losses while worsening the dielectric loss with cooling down.

关键词： GaN/Si SAW resonator ultrahigh Q-factor temperature-dependent performance mBVD losses

Lithium Isotope Evidence for the Source of Potassium-Rich Brine Solutes in the Jiangling Depression of Central China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2017年第1期91卷 363-364页

作者： WANG Licheng LIU Chenglin WANG Chunlian xu haiming ZHANG Yongming MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological Sciences Qinghai Institute of Salt Lakes Chinese Academy of Sciences

Objective High-temperature and high-pressure brines have been discovered in the Jiangling Depression west of the Jianghan Basin,which contain K,Li,Rb and Cs of high economic *** now,little attention has been paid to t... 详细信息

关键词： Lithium Isotope Evidence Potassium-Rich Brine Solutes Jiangling Depression

Enhanced ozonation degradation of atrazine in the presence of nano-ZnO： Performance, kinetics and effects

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第11期29卷 3-13页

作者： Xiangjuan Yuan xuan Yan haiming xu Dongya Li Lei Sun Gang Cao Dongsheng Xia School of Enuironmental Engineering Wuhan Textile University Wuhan 430073 China Engineering Research Center for Clean Production of Textile Dyeing and Printing Ministry of Education Wuhan 430073 China

Enhanced ozonation degradation of atrazine（ATZ） with nano-ZnO（nZnO） as catalyst and the influences of the operational parameters have been investigated through semi-continuous experiments in this study. The results demonstrated that the combination of ozone（O3） and nZnO showed an obvious synergetic effect and the ATZ degradation conformed to pseudo-first-order kinetics. An improvement of ATZ degradation efficiency by 41.8% and pseudo-first-order rate constant by more than a factor of four was obtained in the O3/nZnO process after 5 min of reaction compared to O3 alone. Meanwhile, the degradation efficiency of ATZ was gradually enhanced with increasing nZnO dosage and initial pH in the range from 3.0 to 8.0, and a higher amount of ATZ was degraded when the initial concentration of ATZ rose from 0.5 to 5 mg/L. Additionally, sulfate ion, chloride ion, nitrate ion and low concentrations of humic acid substances led to enhancement of the ATZ degradation. The notable decrease of ATZ removal efficiency observed in the presence of radical scavengers and the results of free radical tests indicated thatUOH is the dominant active radical species. The mechanism investigation demonstrated that the enhancement effect could be attributed to the introduction of nZnO,which could promote the utilization of O3, enhance the formation of superoxide radical, and further accelerate the production of hydrogen peroxide and the generation of OH/O2-.

关键词： Nano-ZnO Atrazine Catalytic ozonation Reaction mechanism

Molecular characterization and developmental expression patterns of thyroid hormone receptors(TRs) and their responsiveness to TR agonist and antagonist in Rana nigromaculata

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2014年第10期26卷 2084-2094页

作者： Qinqin Lou Yinfeng Zhang Dongkai Ren haiming xu Yaxian Zhao Zhanfen Qin Wuji Wei State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-environmental SciencesChinese Academy of Sciences College of Environment Nanjing University of Technology

Considering some advantages of Rana nigromaculata as an experimental species, we propose that this species, like Xenopus laevis, could be used to assay thyroid hormone（TH） signaling disrupting actions. To validate the utilizability of R. nigromaculata, we investigated the responsiveness of R. nigromaculata to a TH receptor（TR） agonist（T3） and antagonist（amiodarone） by analyzing expression, based on characterizing TR cDNA and developmental expression patterns. With high levels of identity with the corresponding genes in X. laevis, both TRα and TRβ in R. nigromaculata exhibited roughly similar developmental expression patterns to those of X. laevis, in spite of some species-specific differences. Both TRα and TRβ expression had greater changes in the liver and intestine than in the tail and brain during metamorphosis. T3 exposure for 2 days induced more dramatic increases of TRβ expression in stage 27 than in stage34 tadpoles but not in stage 42 tadpoles, showing that the responsiveness of R. nigromaculata to TH decreased with development and disappeared at the onset of metamorphic *** to greater changes of TRβ expression in the liver and intestine than in the tail and brain during metamorphosis, the liver and intestine had higher responsiveness to exogenous T3 than the tail and brain. Amiodarone inhibited T3-induced TRβ expression. Our results show that R. nigromaculata can be used as a model species for assaying TH signaling disrupting actions by analyzing TRβ expression, and intestine tissues at stage 27 are ideal test materials due to high responsiveness and easy accessibility.

关键词： Rana nigromaculata Thyroid hormone receptor Thyroid hormone signaling Developmental expression pattern Responsiveness

The Geochemical and Zircon Trace Elements Characteristics of A-type Granitoids in Boziguoer, Baicheng County, Xinjiang

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第6期87卷 1585-1603页

作者： LIU Chunhua YIN Jingwu WU Cailai SHAO Xingkun YANG Haitao xu haiming WANG Jun State Key Laboratory of Continental Tectonics and Dynamics Institute of Geology Chinese Academy of Geological Sciences China University of Geosciences Detachment of General Gold Party Chinese People's Armed Police Force North-west institute of nonferrous metals geology Institute of Mineral Resources Chinese Academy of Geological Sciences

The Boziguoer A-type granitoids in Baicheng County,Xinjiang,belong to the northern margin of the Tarim platform as well as the neighboring EW-oriented alkaline intrusive *** rocks comprise an aegirine or arfvedsonite quartz alkali feldspar syenite,an aegirine or arfvedsonite alkali feldspar granite,and a biotite alkali feldspar *** major rock-forming minerals are albite,K-feldspar,quartz,arfvedsonite,aegirine,and *** accessory minerals are mainly zircon,pyrochlore,thorite,fluorite,monazite,bastnaesite,xenotime,and *** chemical composition of the alkaline granitoids show that SiO2 varies from 64.55％ to 72.29％ with a mean value of 67.32％,Na2O＋K2O is high （9.85％-11.87％） with a mean of 11.14％,K2O is 2.39％-5.47％（mean =4.73％）,the K2O/Na2O ratios are 0.31-0.96,Al2O3 ranges from 12.58％ to 15.44％,and total FeOT is between 2.35％ and 5.65％.CaO,MgO,MnO,and TiO2 are *** REE content is high and the total SREE is （263-1219） ppm （mean =776 ppm）,showing LREE enrichment and HREE depletion with strong negative Eu *** addition,the chondrite-normalized REE patterns of the alkaline granitoids belong to the ＂seagull＂ pattern of the *** Zr content is （113-1246） ppm （mean =594 ppm）,Zr＋Nb＋Ce＋Y is between （478-2203） ppm with a mean of 1362 ***,the alkaline granitoids have high HFSE （Ga,Nb,Ta,Zr,and Hf） content and low LILE （Ba,K,and Sr） *** Nb/Ta ratio varies from 7.23 to 32.59 （mean =16.59） and the Zr/Hf ratio is 16.69-58.04 （mean =36.80）.The zircons are depleted in LREE and enriched in *** chondrite-normalized REE patterns of the zircons are of the ＂seagull＂ pattern of the left-inclined type with strong negative Eu anomaly and without a Ce *** Boziguoer A-type granitoids share similar features with A1-type *** average temperature of the granitic magma was estimated at 832-839℃.The Boziguoer A-type granitoids show crust-mantle mixing and may have formed in an anorogenic intraplate te

关键词： A-type granitoids mineralogy petrology geochemistry Boziguoer Southwest Tianshan

Statistical method for mapping QTLs for complex traits based on two backcross populations

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2012年第21期57卷 2645-2654页

作者： ZHU ZhiHong HAYART Yousaf YANG Jian CAO LiYong LOU XiangYang xu haiming Agronomy Department College of Agriculture and BioteehnologyZhejiang UniversityHangzhou 310058China Department of Mathematics Statistics and Computer ScienceNWFP Agricultural University PeshawarPeshawar 25130Pakistan China National Rice Research Institute National Center for Rice ImprovementState Key Laboratory of Rice BiologyHangzhou 310006China Department of Biostatistics School of Public HealthUniversity of Alabama at BirminghamBirminghamAlabama 35294USA

Most important agronomic and quality traits of crops are quantitative in *** genetic variations in such traits are usually controlled by sets of genes called quantitative trait loci (QTLs),and the interactions between QTLs and the *** is crucial to understand the genetic architecture of complex traits to design efficient strategies for plant *** the present study,a new experimental design and the corresponding statistical method are presented for QTL *** proposed mapping population is composed of double backcross populations derived from backcrossing both homozygous parents to DH (double haploid) or RI (recombinant inbreeding) lines *** an immortal mapping population allows for across-environment replications,and can be used to estimate dominance effects,epistatic effects,and QTL-environment interactions,remedying the drawbacks of a single backcross *** this method,the mixed linear model approach is used to estimate the positions of QTLs and their various effects including the QTL additive,dominance,and epistatic effects,and QTL-environment interaction effects (QE).Monte Carlo simulations were conducted to investigate the performance of the proposed method and to assess the accuracy and efficiency of its *** results showed that the proposed method could estimate the positions and the genetic effects of QTLs with high efficiency.

关键词：回交群体品质性状基因定位统计方法数量性状位点上位性效应基础相互作用

Polybrominated diphenyl ether (PBDE) in blood from children (age 9–12) in Taizhou, China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第7期23卷 1199-1204页

作者： Xiaoyou Zhang Xianli Ruan Minchan Yan Yaxian Zhao Wuji Wei Zhanfen Qin Yongjian Yang haiming xu Yan Li Nanjing University of Technology Nanjing 210009 China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing 100085 China Taizhou Hospital Taizhou 317000 China Tongde Hospital Hangzhou 310012 China Taizhou No. 1 Middle School Taizhou 318000 China

Polybrominated diphenyl ethers （PBDEs） as ubiquitous persistent organic pollutants have attracted much attention in recent years. Exposure to PBDEs could induce a high health risk for children. The aim of this study was to investigate the PBDEs exposure of children （9–12 years） from Taizhou, China. Fifty-eight blood samples were collected in one school in a mountainous area in Taizhou. The concentrations of ∑9PBDEs （sum of BDE-28, -47, -99, -100, -153, -154, -183, -197 and -209） ranged from 2.66 to 33.9 ng/g lipid wet （lw） with a median of 7.22 ng/g lw. These concentrations were lower than those of children in USA, but close to European and Asian general population levels. The results showed that children in Taizhou countryside were at a low level of PBDEs exposure. The predominant congener was BDE-209, followed by BDE-28, -47, -197 and -153. High abundance of BDE-209 was consistent with the pollution background of PBDEs in China characterized by high brominated congeners as main pollutants.

关键词： polybrominated diphenyl ether children blood exposure Taizhou

Development and characterization of monoclonal antibodies against human aryl hydrocarbon receptor

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第1期28卷 165-174页

作者： Wenjing Tian Xinhui Pei Heidi Qunhui Xie Sherry Li xu Jijing Tian Qin Hu haiming xu Yangsheng Chen Hualing Fu Zhengyu Cao Bin Zhao Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing I00085 China China Pharmaceutical University Nanjing 211198 China

Aryl hydrocarbon receptor（Ah R）, a ligand-dependent nuclear receptor, is involved in a diverse spectrum of biological and toxicological effects. Due to the lack of three dimensional（3D）crystal or nuclear magnetic resonance structure, the mechanisms of these complex effects of AhR remain to be unclear. Also, commercial monoclonal antibodies（mA bs） against human AhR protein（h Ah R）, as alternative immunological tools, are very limited. Thus, in order to provide more tools for further studies on h Ah R, we prepared two m Abs（1D6 and 4A6） against h Ah R. The two newly generated m Abs specifically bound to amino acids 484–508（located in transcription activation domain） and amino acids 201–215（located in Per-ARNT-Sim domain）of h Ah R, respectively. These epitopes were new as compared with those of commercial m *** m Abs were also characterized by enzyme-linked immunosorbent assay, western blot,immunoprecipitation and indirect immunofluorescence assay in different cell lines. The results showed that the two m Abs could recognize the linearized AhR s in six different human cell lines and a rat hepatoma cell line, as well as the h Ah R with native conformations. We concluded that the newly generated m Abs could be employed in AhR-based bioassays for analysis of environmental contaminants, and held great potential for further revealing the spatial structure of AhR and its biological functions in future studies.

关键词： Aryl hydrocarbon receptor Monoclonal antibody Western blot Immunoprecipitation Indirect immunofluorescence assay

Pathogens of first-episode pulmonary infection in 141 children with chronic granulomatous disease

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第4期137卷 502-504页

作者： Hui Liu Shunying Zhao haiming Yang Jinrong Liu Hui xu Xiaolei Tang Yuelin Shen Xiaoyan Zhang Xiaohui Wen Yuhong Zhao Ping Chu Huimin Li Department of Second Respiratory Medicine National Clinical Research Center for Respiratory DiseasesBeijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijing 100045China Office of Scientific Research Beijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijing 100045China

To the Editor:Chronic granulomatous disease(CGD)is an inherited primary immunodeficiency disease characterized by recurrent life-threatening bacterial or fungal infection and tissue granuloma formation.^([1])Pulmonary infection is the most frequent manifestation,affecting nearly 80%of patients,[2]and remains the major cause of morbidity and mortality in patients with *** of the pathogenic microorganisms responsible for first-episode pulmonary infection provide information on the spectrum of infection in patients with CGD,help guide the empirical choice of antibiotics or antifungal therapy,and contribute to the early identification and management of *** is the commonest causative agent of pulmonary infection,but the distribution of other pathogens varies among countries.^([2–5])Few studies have investigated the etiology of pulmonary infection in CGD in a large cohort in China.

关键词： granuloma infection mortality