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Climatic implications in earlywood and latewood width indices of Chinese pine in north central China

Journal of Forestry Research 2024年第3期35卷 143-153页

作者： kaixuan yang Junzhou Zhang Haowen Fan Yuan Yan College of Geographic Sciences Qinghai Normal UniversityXining 810016People's Republic of China Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation(Ministry of Education) Xining 810016People's Republic of China Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730030People's Republic of China Gansu Liancheng Forest Ecosystem Field Observation and Research Station Lanzhou UniversityLanzhou 730333People's Republic of China School of Geography and Information Engineering University of GeoscienceWuhan 430074People's Republic of China

Latewood width(LWW)indices of trees are considered a reliable proxy of summer precipitation in the Northern ***,the strong coupling and high correlation between earlywood width(EWW)and LWW indices often prevent registration of climate signals of the LWW *** this study,328-year-long earlywood width and latewood width chronologies were developed from Chinese pine at two sites in the Hasi Mountains,north central *** climate responses of these chronologies were analyzed and the LWW index used to derive sum-mer precipitation *** analyses showed that LWW was particularly influenced by earlywood growth and recorded stronger climate signals of the previous year as EWW,rather than those of the current year with infrequent summer climate ***,after removing the effect of earlywood growth using a simple regression model,the adjusted LWW chronology(LWW_(adj))showed a strong relationship with July precipitation in dry *** suggests that the LWW_(adj) chronology has the potential to be used to investigate long-term variability in summer precipitation in drought-limited regions.

关键词： Dendroclimatology Latewood width Climate response Summer precipitation Earlywood effect

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Nanostructure and reactivity of soot from biofuel 2,5-dimethylfuran pyrolysis with CO_(2) additions

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Frontiers in Energy 2022年第2期16卷 292-306页

作者： Lijie ZHANG kaixuan yang Rui ZHAO Mingfei CHEN Yaoyao YING Dong LIU MIIT Key Laboratory of Thermal Control of Electronic Equipment Advanced Combustion LaboratorySchool of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

This paper investigated the nanostructure and oxidation reactivity of soot generated from biofuel 2,5-dimethylfuran pyrolysis with different CO_(2) additions and different temperatures in a quartz tube flow *** morphology and nanostructure of soot samples were characterized by a low and a high resolution transmission electron spectroscopy(TEM and HRTEM)and an X-ray diffraction(XRD).The oxidation reactivity of these samples was explored by a thermogravimetric analyzer(TGA).Different soot samples were collected in the tail of the *** the increase of temperature,the soot showed a smaller mean particle diameter,a longer fringe length,and a lower fringe tortuosity,as well as a higher degree of ***,the variation of soot nanostructures resulting from different CO_(2) additions was not *** with 0%,50%,and 100%CO_(2) additions at one fixed temperature,the soot collected from the 10%CO_(2) addition has the highest degree of graphization and *** three temperatures of 1173 K,1223 K,and 1273 K,the mean values of fringe length distribution displayed a ranking of 10%CO_(2)>100%CO_(2)>50%CO_(2) while the mean particle diameters showed the same ***,the oxidation reactivity of different soot samples decreased in the ranking of 50%CO_(2) addition>100%CO_(2) addition>10%CO_(2) addition,which was equal to the ranking of mean values of fringe tortuosity *** result further confirmed the close relationship between soot nanostructure and oxidation reactivity.

关键词： 2 5-dimethylfuran pyrolysis soot CO_(2)addition nanostructure reactivity

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Predictors of dysphagia screening and pneumonia among patients with acute ischaemic stroke in China:findings from the Chinese Stroke Center Alliance(CSCA)

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Stroke & Vascular Neurology 2022年第4期7卷 294-301,I0005-I0008页

作者： Jianshu Liang Zhike Yin Zixiao Li Hongqiu Gu kaixuan yang Yunyun Xiong Yongjun Wang Chunjuan Wang Nursing Department Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Neurology Vascular NeurologyBeijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Neurology Vascular NeurologyChina National Clinical Research Center for Neurological DiseasesBeijing Tiantan HospitalCapital Medical UniversityBeijingChina Research Unit of Artificial Intelligence in Cerebrovascular Disease Chinese Academy of Medical SciencesBeijingChina China National Clinical Research Center for Neurological Diseases Beijing Tiantan HospitalCapital Medical UniversityBeijingChina

Background and purpose Guidelines recommend dysphagia screening to identify those at high risk of ***,little is known about the prevalence and predictors of dysphagia screening and pneumonia among patients with acute ischaemic stroke in *** Using data from the Chinese Stroke Center Alliance,which is a multicentre,prospective,consecutive patient enrolment programme,univariate and multivariate analyses were conducted to identify patient and hospital characteristics associated with dysphagia screening and pneumonia during acute *** Of 790811 patients admitted to 1476 hospitals,622718(78.7%)underwent dysphagia screening,and 64398(8.1%)developed *** in stroke units were more likely to be screened for dysphagia than those not in stroke units(OR 1.50;95%CI 1.48 to 1.52),while patients with a past history of stroke were less likely to be screened(OR 0.87;95%CI 0.86 to 0.88).Dysphagia screening(OR 1.46;95%CI 1.30 to 1.65),dysphagia(OR 7.31;95%CI 7.15 to 7.46),and admission to stroke units(OR 1.17;95%CI 1.14 to 1.19)were significantly associated with a greater risk of *** Dysphagia was a critical factor in the development of *** one in five patients with acute ischaemic stroke in the Chinese Stroke Center Alliance were not screened for *** prevention during acute hospitalisation is dependent not only on dysphagia screening but also on the effectiveness of subsequent dysphagia management *** studies are needed to elucidate the relationship between dysphagia screening,stroke unit care and pneumonia in patients with acute ischaemic stroke.

关键词： pneumonia prevention likely

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Highly sensitive,sub-microsecond polymer photodetectors for blood oxygen saturation testing

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Science China Chemistry 2021年第8期64卷 1302-1309页

作者： Zijin Zhao Baiqiao Liu Changlin Xie Yao Ma Jian Wang Ming Liu kaixuan yang Yunhua Xu Jian Zhang Weiwei Li Liang Shen Fujun Zhang Key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong UniversityBeijing100044China Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun130012China College of Physics and Electronic Engineering Taishan UniversityTaian271021China Guangxi Key Laboratory of Information Materials School of Material Science and TechnologyGuilin University of Electronic TechnologyGuilin541004China

Bottom surface of active layers and interface of indium tin oxide(ITO)electrodes and active layers play a crucial role in determining the performance of polymer photodetectors with photomultiplication(PM-PPDs).The interfacial trapped electron distribution closing to ITO electrodes will determine spectral response range and external quantum efficiency(EQE)of *** bottom interface is more sensitive than top interface when light is coming from the ITO side,and the larger density of generated charge on the bottom interfaces will induce interfacial band more bending for efficient charge tunneling *** sensitive and sub-microsecond PM-PPDs are achieved with PMBBDT:Y6(100:7,w/w)as active layers under forward bias,yielding EQE of 18,700%at 320 nm,21,700%at 600 nm and 16,400%at 810 nm under a bias of 7 V,respectively,as well as fast response time of 79μ*** high EQE of the PM-PPDs is attributed to efficient hole tunneling injection from ITO electrode under forward *** electron traps closing to ITO electrode will be quickly filled up when light is coming from ITO side,leading to interfacial band more bending for hole tunneling ***,the PM-PPDs is performed to measure heart rate(HR)and blood oxygen saturation(SpO_(2)),and the measured data by the PM-PPDs are very similar with those obtained by commercial photodetectors.

关键词： polymer photodetectors photocurrent multiplication interface blood oxygen saturation

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Broadband photomultiplication-type polymer photodetectors and its application in light-controlled circuit

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Science China Chemistry 2022年第8期65卷 1642-1649页

作者： Ming Liu Qunping Fan kaixuan yang Zijin Zhao Xingchao Zhao Zhengji Zhou Jian Zhang Francis Lin Alex K.-Y.Jen Fujun Zhang Key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China Department of Chemistry City University of Hong KongHong Kong 999077China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Key Lab for Special Functional Materials Ministry of EducationNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand School of MaterialsHenan UniversityKaifeng 475004China Guangxi Key Laboratory of Information Materials School of Material Science and TechnologyGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering University of WashingtonWashington 98195-2120United States Hong Kong Institute for Clean Energy City University of Hong KongHong Kong 999077China

Photomultiplication-type polymer photodetectors(PM-PPDs)were achieved with polymer P3HT as donor and PY3Se-1V as acceptor based on structure of ITO/PEDOT:PSS/active layer/*** optimal weight ratio of P3HT to PY3Se-1V is about 100:*** of isolated electron traps are formed with PY3Se-1V surrounded by P3HT due to rather less content of PY3Se-1V in active layers and about 0.94 e V energy offset between the lowest unoccupied molecular orbitals(LUMO)of P3HT and *** optimal PM-PPDs exhibit broad spectral response from 350 to 950 nm and external quantum efficiency(EQE)values of68,200%at 360 nm,26,400%at 630 nm and 19,500%at 850 nm under-15 V *** working mechanism of PM-PPDs is attributed to the interfacial trap-assisted hole tunneling injection from external *** performance of PM-PPDs can be further improved by incorporating appropriate PMBBDT with high hole mobility as the third *** EQE values of optimal ternary PM-PPDs are increased to 105,000%at 360 nm,40,000%at 630 nm and 31,800%at 850 nm under-15 V bias,benefiting from the enhanced hole transport in ternary active *** optimal ternary PM-PPDs were successfully applied in a light-controlled circuit to turn on or turn off light emitting diode(LED).

关键词： polymer photodetectors photomultiplication external quantum efficiency broadband

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生物光声—超声—磁声联合成像的研究进展

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中国医学影像技术 2017年第9期33卷 1407-1411页

作者：孙正杨凯旋华北电力大学电子与通信工程系河北保定071003

生物超声(US)、光声(PA)和磁声(MA)成像均以超声波作为载体,将其结合可获得生物组织的组合图像,充分发挥各成像手段的优势。与单一成像技术相比,联合成像具有更好的分辨率及更高的对比度和敏感度,可更精准地定位病变组织,并辨识出其形... 详细信息

生物超声(US)、光声(PA)和磁声(MA)成像均以超声波作为载体,将其结合可获得生物组织的组合图像,充分发挥各成像手段的优势。与单一成像技术相比,联合成像具有更好的分辨率及更高的对比度和敏感度,可更精准地定位病变组织,并辨识出其形态和成分。本文对光声—超声、磁声—超声及磁光声联合成像,尤其内窥式联合成像的研究进展及应用现状进行综述。

关键词：光声成像超声检查磁声成像内窥成像

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Prognosis in epithelial ovarian cancer: Clinical analysis of 287 pelvic and para-aortic lymphadenectomy

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The Chinese-German Journal of Clinical Oncology 2007年第5期6卷 492-496页

作者： Xiaoyun yang Minmin Hou kaixuan yang Hongjing Wang Zhilan Peng Zeyi Cao Mingrong Xi Department of Obstetrics/Gynecology West China Second University Hospital Sichuan University Chengdu610041 China Department of Pathology West China Second University Hospital Sichuan University Chengdu 610041 China Department of Obstetrics/Gynecology The Second Teaching Hospital Sichuan University Chengdu 610041 China

Objective: To evaluate the relationship between the pelvic and para-aortic lymphadenectomy and the prognosis of epithelial ovarian cancer. Methods: 287 patients suffering from primary epithelial ovarian cancer from 1995 to 2005 were analyzed retrospectively. Results: The 3-, 5-, 10-year survival with systematic lymphadenectomy (SL) were slightly higher than those without SL, but there were no statistically significance (P > 0.05). The 3-, 5-, 10-year survival of clinical stages without SL were lower than those with SL, but there were no significant difference either (P > 0.05). The 3-,5-, and 10-year survival rates with SL were higher than those without SL with no statistically differences (P > 0.05) among the subgroups such as absent, ≤ 2 cm and > 2 cm residual tumor. The survival rates of the groups without residual tumor and the group with ≤ 2 cm residual tumor were significantly higher than that of > 2 cm (P < 0.005). On multivariate analysis, patient staging (P = 0.01) and size of residual disease after primary cytoreductive surgery (P < 0.001 and = 0.002, respectively) retained prognostic significance. SL was not proved to be an independent prognostic factor (P = 0.69). Conclusion: Systematic pelvic and para-aortic lymphadenectomy can not improve and prolong the survival time significantly.

关键词： primary epithelial ovarian cancer systematic lymphadenectomy survival rate prognosis

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循环肿瘤细胞的检测及其在鼻咽癌中的研究进展

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中国全科医学 2021年第8期24卷 1022-1027页

作者：曾蕾杨凯旋四川大学华西医院头颈肿瘤科四川省成都市610041

循环肿瘤细胞(CTCs)是指从原发肿瘤或转移灶中脱落进入机体循环系统的肿瘤细胞,与肿瘤的复发、转移密切相关。CTCs作为一种新型的生物标志物,其在乳腺癌、前列腺癌、结直肠癌等多种类型肿瘤的早期诊断、疗效评价及预后评估等方面的作用... 详细信息

循环肿瘤细胞(CTCs)是指从原发肿瘤或转移灶中脱落进入机体循环系统的肿瘤细胞,与肿瘤的复发、转移密切相关。CTCs作为一种新型的生物标志物,其在乳腺癌、前列腺癌、结直肠癌等多种类型肿瘤的早期诊断、疗效评价及预后评估等方面的作用已得到了证实。近年来,CTCs在鼻咽癌的相关研究中也取得了一定的进展。本文就CTCs的特性、检测方法及其在鼻咽癌中的研究进展做一综述,以为CTCs的临床应用提供参考。

关键词：肿瘤细胞循环特性检测鼻咽肿瘤综述

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临床预测模型常用统计模型及其SAS实现

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中国卒中杂志 2024年第5期19卷 496-505页

作者：杨凯璇谷鸿秋首都医科大学附属北京天坛医院国家神经系统疾病临床医学研究中心北京100070

临床预测模型在医学研究中的应用越来越广泛,欲达到良好的预测性能,选择正确的模型非常关键。对于预测模型类型的选择,预测结局的类型起着决定性作用。本文从数据类型的角度出发,将结局变量分为连续变量(正态分布、偏态分布)、分类变量... 详细信息

临床预测模型在医学研究中的应用越来越广泛,欲达到良好的预测性能,选择正确的模型非常关键。对于预测模型类型的选择,预测结局的类型起着决定性作用。本文从数据类型的角度出发,将结局变量分为连续变量(正态分布、偏态分布)、分类变量(二分类、无序多分类、有序多分类)以及时间-事件变量(无竞争风险、有竞争风险),分别介绍不同类型结局变量的特点、对应的模型、建模案例以及SAS实现程序,以期为研究者构建预测模型提供参考。

关键词：临床预测模型统计模型逻辑回归

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燃煤机组烟气余热和水协同回收系统多参数优化及运行策略

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中国电机工程学报 2021年第13期41卷 4566-4575页

作者：杨凯旋封又琳刘明严俊杰动力工程多相流国家重点实验室(西安交通大学) 陕西省西安市710049

为提高燃煤机组烟气余热和水协同回收系统的节能减排及技术经济性能,保障系统的安全运行,论文建立了系统多参数优化以及变工况特性分析模型,以330MW机组为例,研究获得了系统的优化参数以及节能节水潜力,并依据系统变工况特性提出了系统... 详细信息

为提高燃煤机组烟气余热和水协同回收系统的节能减排及技术经济性能,保障系统的安全运行,论文建立了系统多参数优化以及变工况特性分析模型,以330MW机组为例,研究获得了系统的优化参数以及节能节水潜力,并依据系统变工况特性提出了系统全工况优化运行的调控策略。基准工况优化计算结果表明:设计工况下的系统综合节水率为15.34kg·s^(-1),系统综合节煤率达4.12g·(kW·h)^(-1)。系统的变工况特性研究表明:烟气余热和水协同回收系统内工质温度和节煤率均随着环境温度的降低而降低,当环境温度降低至-20℃时,烟气余热和水协同回收系统综合节煤率降低38.7%,低温烟气冷却器进口循环水温度降至70℃以下,此时系统运行安全受到威胁。为此,论文提出系统全工况优化运行策略,该策略不仅可以维持低温烟气冷却器进口循环水温度在70℃之上保障系统安全,同时,可以实现烟气冷凝过程余热的有效利用。

关键词：燃煤机组余热回收水回收协同回收多参数优化运行策略

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