检索结果-南通市图书馆

Studies of surface plasmon resonance sensor using bi-beam differential measurement approach

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第12期8卷 2027-2031页

作者： ZENG Han-rong WANG Xiao-ping zhang xue-jiao Department of Optical Engineering Zhejiang University Hangzhou 310027 China

In this paper, a low-cost measurement approach with bi-beam was presented, which can be used for real-time detection and online analysis of solution refractive index, based on systematical analysis and experiments of conventional detection methods on surface plasmon resonance sensor. This novel method was analyzed theoretically and based on it a sensor system set was established. The factors that affect the sensor's sensitivity and working range were discussed. The angular adjustment setup was simplified, errors produced by movable components were avoided and the maneuverability was enhanced with this new method. The noiseproof feature and stability of the sensor system were greatly improved as well.

关键词： Kretschmann prism structure Light intensity Bi-beam measurement Light differential Surface plasmon resonance

多种系统评分对肝硬化合并急性上消化道出血患者28 d死亡的预测作用

在线全文

学校读者我要写书评

暂无评论

现代消化及介入诊疗 2024年第5期29卷 523-527页

作者：张雪娇李欣欣李磊王然哈尔滨医科大学附属第一医院重症医学科 150001

目的比较MELD评分、AIMS65评分及血小板-白蛋白-胆红素指数(PALBI)在肝硬化合并急性上消化道出血(AUGIB)患者28 d死亡预测中的应用价值,以期为临床筛查最适宜的预后预测评分提供参考依据。方法回顾性纳入2020年1月—2023年12月哈尔滨医... 详细信息

目的比较MELD评分、AIMS65评分及血小板-白蛋白-胆红素指数(PALBI)在肝硬化合并急性上消化道出血(AUGIB)患者28 d死亡预测中的应用价值,以期为临床筛查最适宜的预后预测评分提供参考依据。方法回顾性纳入2020年1月—2023年12月哈尔滨医科大学第一附属医院重症医学科治疗的378例肝硬化AUGIB患者,根据28 d生存情况分为死亡组60例(15.9%)和生存组318例(84.1%)。通过在线病历系统收集所有肝硬化AUGIB患者的临床资料,计算MELD评分、AIMS65评分及PALBI评分。采用二分类Logistic回归分析MELD评分、AIMS65评分、PALBI评分对肝硬化AUGIB患者死亡的影响,并采用ROC曲线对此3种评分预测肝硬化AUGIB患者死亡的效能进行评定。结果单因素分析显示,与生存组比较,死亡组糖尿病、肝性脑病比例以及凝血酶原时间、红细胞分布宽度、C反应蛋白、MELD评分、AIMS65评分、PALBI评分均升高,白蛋白降低,差异具有统计学意义(P<0.05)。多因素Logistic回归分析结果显示,校正糖尿病、肝性脑病比例、凝血酶原时间等混杂因素后,MELD评分(OR=1.621,95%CI:1.185-2.217)、AIMS65评分(OR=1.914,95%CI:1.361-2.690)、PALBI评分(OR=1.984,95%CI:1.410-2.791)是肝硬化AUGIB患者死亡的独立危险因素。ROC曲线显示,MELD评分、AIMS65评分、PALBI评分预测肝硬化28 d死亡的AUC分别为0.685(95%CI:0.614-0.756)、0.828(95%CI:0.771-0.885)、0.860(95%CI:0.808-0.913)。结论MELD评分、AIMS65评分、PALBI评分均是肝硬化AUGIB患者死亡的独立危险因素,并对预后风险具有提示作用,其中以AIMS65评分、PALBI评分的预测价值最高。

关键词：肝硬化急性上消化道出血 MELD评分 AIMS65评分 PALBI评分

Radial growth in Qinghai spruce is most sensitive to severe drought in the Qilian Mountains of Northwest China

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第3期35卷 73-86页

作者： Xuge Wang Liang jiao Ruhong xue Peng zhang Dashi Du Mengyuan Wei Qian Li College of Geography and Environmental Science Northwest Normal UniversityNo.967Anning East RoadLanzhou 730070People's Republic of China Key Laboratory of Resource Environment and Sustainable Development of Oasis Northwest Normal UniversityLanzhou 730070Gansu ProvincePeople's Republicof China

Global warming and frequent extreme drought events lead to tree death and extensive forest decline,but the underlying mechanism is not *** drought years,cambial development is more sensitive to climate change,but in different phenological stages,the response rela-tionship is ***,the dynamic relationship between tree radial growth and climatic/environmental fac-tors needs to be *** thus continuously monitored radial growth of Qinghai spruce(Picea crassifolia Kom.)and environmental factors from January 2021 to November 2022 using point dendrometers and portable meteorological weather stations in the central area of the Qilian *** relationship and stability between the radial growth of Qinghai spruce and environmental factors were compared for different levels of drought in 2021 and *** year 2022 had higher temperatures and less precipitation and was drier than *** with 2021,the growing period in 2022 for Qinghai spruce was 10 days shorter,maximum growth rate(Grmax)was 4.5μm·d^(-1) slower,and the initiation of growth was 6 days *** of Qinghai spruce was always restricted by drought,and the stem radial increment(SRI)was more sensitive to precipitation and air relative *** changes in cumulative radial growth were divided into four phenological stages according to the time of growth onset,cessation,and maximum growth rate(Grmax)of Qinghai *** responses of SRI to climate change were stronger in Stage 3 and Stage 4 of 2021 and stronger in Stage 1(initiation growth stage)and Stage 3 of *** results provide important information on the growth of the trees in response to drought and for specific managing forests as the climate warms.

关键词： Picea crassifolia Radial growth dynamics Severe drought Response stability Point dendrometer

Elevation response of above-ground net primary productivity for Picea crassifolia to climate change in Qilian Mountains of Northwest China based on tree rings

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2024年第1期34卷 146-164页

作者： WU Xuan jiao Liang DU Dashi xue Ruhong WEI Mengyuan zhang Peng College of Geography and Environment Science Northwest Normal UniversityLanzhou 730070China Key Laboratory of Resource Environment and Sustainable Development of Oasis Northwest Normal UniversityLanzhou 730070China

Current ecosystem models used to simulate global terrestrial carbon balance generally suggest that terrestrial landscapes are stable and mature,but terrestrial net primary productivity(NPP)data estimated without accounting for disturbances in species composition,environment,structure,and ecological characteristics will reduce the accuracy of the global carbon ***,the steady-state assumption and neglect of elevation-related changes in forest NPP is a *** Qilian Mountains are located in continental climate zone,and vegetation is highly sensitive to climate *** quantified aboveground biomass(AGB)and aboveground net primary productivity(ANPP)sequences at three elevations using field-collected tree rings of Picea crassifolia in Qilian Mountains of Northwest *** results showed that(1)There were significant differences between AGB and ANPP at the three elevations,and the growth rate of AGB was the highest at the low elevation(55.99 t ha^(–1)10a^(–1)).(2)There are differences in the response relationship between the ANPP and climate factors at the three elevations,and drought stress is the main climate signal affecting the change of ANPP.(3)Under the future climate scenario,drought stress intensifies,and the predicted decline trend of ANPP at the three elevations from mid-century to the end of this century is–0.025 t ha^(–1)10a^(–1),respectively;–0.022 t ha^(–1)10a^(–1);At–0.246 t ha^(–1)10a^(–1),the level of forest productivity was significantly *** results reveal the elevation gradient differences in forest productivity levels and provide key information for studying the carbon sink potential of boreal forests.

关键词： global climate change tree ring aboveground net primary productivity aboveground biomass drought stress Qilian Mountains

Rational design of vitamin C/defective carbon van der Waals heterostructure for enhanced activity,durability and storage stability toward oxygen reduction reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第1期88卷 103-111,I0003页

作者： Ruiqi Cheng Kaiqi Li Huanxin Li Tianshuo Zhao Yibo Wang Qingyue xue jiao zhang Chaopeng Fu Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Christopher Ingold Laboratory Department of ChemistryUniversity College LondonLondon WC1H 0AJUK Department of Chemistry Physical&Theoretical Chemistry LaboratoryUniversity of OxfordSouth Parks RoadOxford OX13QZUK

Metal-free defective carbon materials with abundant active sites have been widely studied as low-cost and efficient oxygen reduction reaction(ORR)electrocatalysts in metal-air ***,the active sites in defective carbon are easily subjected to serious oxidation or hydroxylation during ORR or storage,leading to rapid degradation of ***,we design a van der Waals heterostructure comprised of vitamin C(VC)and defective carbon(DC)to not only boost the activity but also enhance the durability and storage stability of the DC-VC *** formation of VC van der Waals between DC and VC is demonstrated to be an effective strategy to protect the defect active sites from oxidation and hydroxylation degradation,thus significantly enhancing the electrochemical durability and storage anti-aging ***,the DC-VC van der Waals can reduce the reaction energy barrier to facilitate the *** findings are also confirmed by operando Fourier transform infrared spectroscopy and density functional theory *** is necessary to mention that the preparation of this DC-VC electrocatalyst can be scaled up,and the ORR performance of the largely produced electrocatalyst is demonstrated to be very ***,the DC-VC-based aluminum-air batteries display very competitive power density with good performance maintenance.

关键词： Van der Waals heterostructure Oxygen reduction reaction Stability Scalable production Aluminum-air battery

The Research of PKI in the Application of Hadoop Security

在线全文

学校读者我要写书评

暂无评论

Detection of Increasingγ-Ray Emissions from 4FGL J1718.5+4237 with Fermi-LAT

中国电子商情·通信市场 2013年第1期 108-113页

作者： zhang xue-jiao LIU Pei-Shun

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第8期24卷 169-174页

作者： jiao Zheng Pengfei zhang Li zhang Department of Astronomy School of Physics and AstronomyKey Laboratory of Astroparticle Physics of Yunnan ProvinceYunnan UniversityKunming 650091China School of Physics and Engineering Technology Xingyi Normal University for NationalitiesXingyi 562400China

We report a gradual brighteningγ-ray source,4FGL J1718.5+4237,in 0.1-500.0 GeV,which may be associated with a blazar NVSS J171822+423948 with a redshift of~*** analyzed 15.25 yr ofγ-ray data recorded by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detected significantγ-ray emissions in the direction of the blazar with a test statistic(TS)of~*** on timing analysis using a 1 yr time bin,we have observed a gradual brightening inγ-ray emissions from the *** our analysis,we categorize them into two states:Quiet(TS~0)and Loud(TS~226)states,with the distinction occurring in 2016 August(MJD57602.69).From the Quiet state to the brightest period(the last data point),theγ-ray flux in 0.1-500.0 GeV increased by more than 12-fold from<0.2×10^(-8)photons cm^(-1)s^(-1)to 2.6×10^(-8)photons cm^(-1)s^(-1).Additionally,we studied the spectral properties in detail for the Loud state and the overall *** no significant variation was detected,both exhibited a spectral indexΓof~*** origin of the brighteningγ-ray emissions from the target is not yet *** long-term multi-wavelength observations and studies will provide insight into the astrophysical mechanisms of the target.

关键词： galaxies active-blazars individual(4FGL J1718.5+4237)

A Possible γ-Ray Pulsation from PSR J1740-5340B in the Globular Cluster NGC 6397

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第1期24卷 285-291页

作者： jiao Zheng Pengfei zhang Li zhang Department of Astronomy School of Physics and AstronomyKey Laboratory of Astroparticle Physics of Yunnan ProvinceYunnan UniversityKunming 650091China

Recently, a new radio millisecond pulsar(MSP) J1740-5340B, hosted in the globular cluster(GC) NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a modified radio ephemeris updated by tool tempo2, we analyze the ~15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR J1740-5340B's γ-ray pulsation at a confidence level of ~4σ with a weighted H-test value of ~26. By performing a phase-resolved analysis, the γ-ray luminosity in on-pulse interval of PSR J1740-5340B is L_(γ)~ 3.8 × 10^(33) erg s^(-1) using NGC 6397's distance of 2.48 kpc. And γ-rays from the on-pulse part of PSR J1740-5340B contribute ~90% of the total observed γ-ray emissions from NGC 6397. No significant γ-ray pulsation of another MSP J1740-5340A in the GC is *** that the previous four cases of MSPs in GCs, more data in γ-ray, X-ray, and radio are encouraged to finally confirm the γ-ray emissions from MSP J1740-5340B, especially starving for a precise ephemeris.

关键词： gamma-rays:galaxies (stars:)pulsars:individual(PSR J1740-5340B) (Galaxy:)globular clusters:individual(NGC 6397)

Bibliometric study of sepsis-associated liver injury from 2000 to 2023

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第30期30卷 3609-3624页

作者： Zheng zhang Xiao-jiao Tan Hai-Qing Shi Huan zhang Jian-Bo Li xue-Lian Liao Department of Critical Care Medicine West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Critical Care Medicine West China Tianfu Hospital of Sichuan UniversityChengdu 610200Sichuan ProvinceChina

BACKGROUND Sepsis-associated liver injury(SLI)is a severe and prevalent complication of *** To explore the literature on SLI via a bibliometric *** Reviews and articles correlated with SLI published from January 1,2000 to October 28,2023 were searched from the Web of Science Core ***,the searched data were analyzed using VOSviewer,CiteSpace,and R *** There were 787 publications involved in this paper,comprising 745 articles and 42 ***,the United States,and Germany are the primary publication sources in this *** related to SLI primarily focused on mechanisms of pathogenesis,as evidenced by analyzing keywords,references,and the counting of original *** studies mainly involved tumor necrosis factor alpha,inflammation,oxidative stress,and nuclear factor-kappa *** There is significant growth in the research on *** investigations primarily involve basic experiments that aimed at uncovering pathogenic *** to the analyzed literature,the identified pathogenic mechanisms and potential therapeutic targets serve as the foundation for translating findings from basic research to clinical applications.

关键词： Sepsis Liver injury Bibliometric analysis Cite space VOS viewer