检索结果-南通市图书馆

基于灰色关联度-突变理论模型的黑龙江上游凌汛灾害风险评价

在线全文

学校读者我要写书评

暂无评论

中国农村水利水电 2024年第6期 105-113,123页

作者：徐鸿勋李昱肖兴涛韩红卫黑龙江省水文水资源中心黑龙江哈尔滨150001 东北农业大学水利与土木工程学院黑龙江哈尔滨150030 黑龙江省寒区水资源与水利工程重点实验室黑龙江哈尔滨150030

在高纬度和高海拔地区河流凌汛现象频繁发生,常导致冰塞或冰坝洪水,严重威胁人身和财产安全。因此,全面考虑各因素进行科学的风险评价是预防凌汛灾害风险的首要前提和必然要求。研究基于突变理论构建凌汛灾害风险评价模型,引入灰色关联... 详细信息

在高纬度和高海拔地区河流凌汛现象频繁发生,常导致冰塞或冰坝洪水,严重威胁人身和财产安全。因此,全面考虑各因素进行科学的风险评价是预防凌汛灾害风险的首要前提和必然要求。研究基于突变理论构建凌汛灾害风险评价模型,引入灰色关联度分析法进行基础指标排序,对黑龙江上游地区凌汛灾害风险进行评价。鉴于不同指标之间的相互关联性,采用皮尔逊相关系数法精简指标集并选取代表性年份,依据代表年风险排序与层次聚类分析-突变理论所得结果进行比较。结果表明:在水文、气象、社会、经济等多因素影响下,2000年至2020年期间黑龙江上游漠河、塔河、呼玛三区凌汛灾害风险水平整体均呈现先增大后减小的趋势。其中,积雪深度、水位、冰厚、气温等要素与凌汛灾害发生频率之间表现出极高的相关性,而人口、农业、经济、医疗等社会因素也对洪水发生后的风险水平产生影响。漠河河段因其复杂陡峭的河流地形、恶劣的气候条件以及相对较高的人口密度,整体呈现出较高的风险水平。灰色关联度-突变理论模型风险隶属度值分布在0.85至0.93之间,且较层次聚类分析-突变理论模型具有更优的风险排序和安全裕度,验证了该模型在凌汛灾害风险评价中的有效性和实用性,为凌汛灾害风险研究提供了新的科学方法和理论依据。

关键词：凌汛灾害突变理论灰色关联度风险分析黑龙江

Risk of anxiety and depression in patients with uveitis:a Meta-analysis

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2022年第8期15卷 1381-1390页

作者： Bei Cui hong-Zhen Jia Li-Xiong Gao Xiao-Fei dong Senior Department of Ophthalmology the Third Medical Centre of Chinese People’s Liberation Army General HospitalBeijing 100039China Department of Ophthalmology No.967 Hospital of the Joint Logistics Support Force of the Chinese PLADalian 116000Liaoning ProvinceChina

AIM:To quantitatively evaluate the risk of anxiety and depression in patients with uveitis via performing a ***:Three electronic database(Pub Med,Embase,and Cochrane Library databases)were searched for studies recording data about uveitis and anxiety as well as depression simultaneously up to January *** incidence rate and standard mean difference(SMD)with a 95%confidence interval(95%CI)were calculated to analyse the association using random-effects models based on heterogeneity ***:In total,12 observational studies containing 874 patients with uveitis were *** results showed that there was a significant association between uveitis and anxiety(SMD=0.97,95%CI:0.39 to 1.54,P=0.0009)and depression(SMD=0.79,95%CI:0.51 to 1.07,P<0.00001).The overall morbidities of anxiety and depression in patients with uveitis were 39%and 17%,*** subgroup analysis,the heterogeneity actually came from different kinds of ***,the incidence rates of both anxiety and depression were relatively low in patients with anterior uveitis(33%and 15%),moderate in patients with infectious uveitis(46%and 22%),and high in patients with unspecified uveitis(59%and 35%).CONCLUSION:It is preliminarily indicated that patients with uveitis may have a high risk of anxiety and *** and psychologists should pay more attention to the psychological state when dealing with patients with *** high-quality studies with detailed direct data are needed to draw more precise conclusions.

关键词： anxiety depression uveitis Meta-analysis

Phase Coherence Method for the Resonant Frequency Analysis of the Modified Dumbbell-Shaped Defected Ground Structure Resonator on Coplanar Waveguide

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

Chinese Journal of Electronics 2014年第2期23卷 415-418页

作者： WANG Jun NING Huansheng dong Han hong Tao XIONG Qingxu MAO Lingfeng School of Electronic and Information Engineering Beihang University Institute of Intelligent Structure and System Soochow University

A The resonance of the Modified dumbbellshaped defected ground structure(MD-DGS) resonator on coplanar waveguide is investigated systematically based on the phase coherence of electromagnetic *** the analysis of two presented interference modes,the resonant frequencies can be fully predicted,and the physical understanding behind these resonances is clearly *** proposed analysis is verified by the simulation and measurement results of the MD-DGS *** the electric field distribution and the Poynting vector distribution of the MD-DGS resonator at the resonant frequencies further demonstrate the validity of the theoretical analysis.

关键词： Phase coherence Resonant frequency Defected ground structure

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

园林喷雾机辅助导航系统控制策略分析

农机化研究 2024年第6期46卷 195-199页

作者：赵魏维计宏南京工业职业技术大学南京210023 江苏智慧汽车研究院有限公司南京210001

利用辅助导航控制喷雾机开展自动喷雾作业,不仅能够提高喷雾效率和农药利用率,而且还能降低环境污染程度和保护人身健康安全。尤其在数字化与智能化技术快速普及的新时期,复合导航技术能够与自动控制技术相结合,成为辅助喷雾机智能化作... 详细信息

利用辅助导航控制喷雾机开展自动喷雾作业,不仅能够提高喷雾效率和农药利用率,而且还能降低环境污染程度和保护人身健康安全。尤其在数字化与智能化技术快速普及的新时期,复合导航技术能够与自动控制技术相结合,成为辅助喷雾机智能化作业的关键技术。为此,通过分析园林环境对辅助导航系统的功能需求,梳理了导航系统设计的重点与难点,建立了辅助导航控制系统的主体功能图,并利用BDS差分定位、视觉定位、激光测距、毫米波雷达等技术手段组建了复合导航环境感知系统,在树莓派处理单元与PID控制模式下实现导航决策。经过校园园林环境的CP组、SM组、SQ组试验,证实辅助导航控制系统具有较高的路径行驶准确率和避障精确度,但在局部细节方面仍需提升。

关键词：园林喷雾机导航系统控制策略

Hydrodesulfurization of Thiophene on Ni,Mo-supported MCM-41 Catalysts

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1998年第3期14卷 62-66页

作者： CUI Jun YUE Ying-hong SUN Yu dong Wei-yang GAO Zi Department of Chemistry Fudan UniversityShanghai200433

MoO 3 and NiO supported MCM 41 and AlMCM 41 catalysts were prepared. The XRD and N 2 adsorption/desorption results show that MoO 3 was more readily dispersed on the supports than NiO. The activities of the catalysts for thiophene hydrodesulfurization are strongly affected by the block of the unidimensional mesoporous channels with oxide crystallites and/or extra framework impurities. Mo supported MCM 41 catalysts are more active for hydrodesulfurization than Ni and Ni, Mo supported MCM 41 catalysts.

关键词： MCM 41 Dispersion of MoO 3 and NiO Thiophene hydrodesulfurization

Optical monitoring the degradation of PLGA inverse opal film

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第1期24卷 9-12页

作者： Li-Guo Sun Zhuo-Ying Xie Yuan-Jin Zhao hong-mei Wei Zhong-Ze Gu State Key Laboratory of Bioelectronics Southeast University School of Chemistry and Materials Heilongjiang University

Implantable materials have broad applications in tissue engineering and in vivo sensors. It is essential to know the detailed information of the implantable materials during their degradation. In this paper, we developed a method to monitor the degradation process of a well-used biomaterial, poly（lactide-co- glycolide）（PLGA） by taking advantage of inverse opal structure. We found that mass loss, molecular weight and glass transition temperature of PLGA during the degradation process in Hank＇s artificial body fluid can be in situ monitored bv measuring the ootical orooerties of PLGA inverse ooal.

关键词： PLGA inverse opalDegradationOptical monitoring

共价有机框架膜阳离子基团密度调控实现快速阴离子传导

在线全文

学校读者我要写书评

暂无评论

科学通报 2024年第9期69卷 1111-1113页

作者：孔彦吕博晖吴洪姜忠义天津大学化工学院天津300072

离子交换膜是目前众多电化学应用的核心部件,如燃料电池、电解槽、电化学氢气压缩机等[1].其中,离子传导率是离子交换膜的核心性能指标,决定了相关电化学装置的输出功率、能量转化效率等关键指标.因此,开发高离子传导率的离子交换膜对... 详细信息

离子交换膜是目前众多电化学应用的核心部件,如燃料电池、电解槽、电化学氢气压缩机等[1].其中,离子传导率是离子交换膜的核心性能指标,决定了相关电化学装置的输出功率、能量转化效率等关键指标.因此,开发高离子传导率的离子交换膜对于高性能电化学的应用至关重要.根据导电离子种类,离子交换膜主要分为质子交换膜和阴离子交换膜.

关键词：质子交换膜离子交换膜燃料电池离子传导率能量转化效率电化学装置氢气压缩机阳离子基团

曲拉西利联合免疫联合化疗一线治疗晚期非小细胞肺癌1例及文献分析

在线全文

学校读者我要写书评

暂无评论

中国新药杂志 2024年第11期33卷 1126-1132页

作者：徐华李封王娟郑玉唐洪屈朱玉邱敏汪宇宏重庆市中医院肿瘤科重庆400021

国家癌症中心发布的最新统计数据显示,肺癌仍是我国发病率和死亡率最高的恶性肿瘤。同时,肺癌的发病率及死亡率逐年攀升,对癌症患者及社会造成了严重的负担。非小细胞肺癌(non-small cell lung cancer,NSCLC)是肺癌的主要病理类型,约占... 详细信息

国家癌症中心发布的最新统计数据显示,肺癌仍是我国发病率和死亡率最高的恶性肿瘤。同时,肺癌的发病率及死亡率逐年攀升,对癌症患者及社会造成了严重的负担。非小细胞肺癌(non-small cell lung cancer,NSCLC)是肺癌的主要病理类型,约占全部肺癌的85%左右。晚期NSCLC患者的5年生存率较低,目前,化疗仍然是晚期肺癌治疗的基石。细胞毒类药物会损伤骨髓内的造血干细胞,导致骨髓抑制,使患者因不能耐受而中止治疗。针对骨髓抑制的传统治疗手段可能会引发其他不良反应,如骨髓造血储备功能耗竭等。2022年7月,曲拉西利获批用于预防小细胞肺癌化疗引起的骨髓抑制。曲拉西利能有效预防化疗引起的骨髓抑制,并且不会拮抗化疗的抗肿瘤作用。本文特报道1例曲拉西利联合免疫联合化疗一线治疗晚期NSCLC的病例,以期为临床实践提供进一步的参考。

关键词：非小细胞肺癌化疗引起的骨髓抑制曲拉西利免疫治疗

LncRNAs are potentially involved in the immune interaction between small brown planthopper and rice stripe virus

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2019年第12期18卷 2814-2822页

作者： CHEN Meng-yao YE Wan-yi XIAO Hua-mei LI mei-zhen CAO Zheng-hong YE Xin-hai ZHAO Xian-xin HE Kang LI Fei Institute of Insect Sciences Zhejiang UniversityHangzhou 310058P.R.China College of Life Sciences and Resource Environment Yichun UniversityYichun 336000P.R.China

Small brown planthopper(SBPH, Laodelphax striatellus Fallén) is an important vector of major crop pathogen rice stripe virus(RSV). Controlling SBPH population is an efficient approach to control RSV. Long non-coding RNAs(lnc RNA) have been reported to block virus replication in hosts. However, the function of lnc RNAs in RSV infection and replication is still unknown. Here, we aimed to study regulatory mechanisms of lnc RNA in an immune system during RSV infection. First, lnc RNA genes were predicted from SBPH transcriptomes using a bioinformatics pipeline based on characteristics of lnc RNA. We identified 4 786 lnc RNA genes corresponding to 5 790 transcripts in SBPH from an RNA-Seq dataset of 15 transcriptomes. Differential expression analysis indicated that 3, 11, and 25 lnc RNA genes were highly expressed in gut, salivary gland, and ovary, respectively, of viruliferous SBPH(Student’s t-test, P<0.05). We randomly selected eight lnc RNAs for expression validation using quantitative real-time PCR, confirming the differential expression of these lnc RNAs between viruliferous and non-viruliferous SBPH. In summary, we present evidence that the expression of lnc RNA genes was induced by RSV infection, suggesting that RSV might be involved in the antivirus immune system in SBPH and participate in regulating the RSV replication mechanism. These data provide helpful information for future investigations of the interaction between lncRNA and RSV.

关键词： lncRNA small brown planthopper rice stripe virus RNA-Seq viral infection