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Local Torrential Rainfall Event within a Mei-Yu Season Mesoscale Convective System:Importance of Back-Building Processes

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Advances in Atmospheric Sciences 2024年第5期41卷 847-863页

作者： Honglei ZHANG ming XUE Hangfeng SHEN Xiaofan LI Guoqing zhai Zhejiang Institute of Meteorological Sciences Hangzhou 310017China Center for Analysis and Prediction of Storms and School of MeteorologyUniversity of OklahomaNormanOklahoma 73072USA Department of Atmospheric Science School of Earth SciencesZhejiang UniversityHangzhou 310027China Hangzhou Weather Bureau Hangzhou 310007China

An extreme rainfall event occurred over Hangzhou,China,during the afternoon hours on 24 June 2013.This event occurred under suitable synoptic conditions and the maximum 4-h cumulative rainfall amount was over 150 mm.This rainfall event had two major rainbands.One was caused by a quasi-stationary convective line,and the other by a backbuilding convective line related to the interaction of the outflow boundary from the first rainband and an existing low-level mesoscale convergence line associated with a mei-yu frontal system.The rainfall event lasted 4 h,while the back-building process occurred in 2 h when the extreme rainfall center formed.So far,few studies have examined the back-building processes in the mei-yu season that are caused by the interaction of a mesoscale convergence line and a convective cold pool.The two rainbands are successfully reproduced by the Weather Research and Forecasting(WRF)model with fourlevel,two-way interactive nesting.In the model,new cells repeatedly occur at the west side of older cells,and the backbuilding process occurs in an environment with large CAPE,a low LFC,and plenty of water vapor.Outflows from older cells enhance the low-level convergence that forces new cells.High precipitation efficiency of the back-building training cells leads to accumulated precipitation of over 150 mm.Sensitivity experiments without evaporation of rainwater show that the convective cold pool plays an important role in the organization of the back-building process in the current extreme precipitation case.

关键词： torrential rainfall back-building processes numerical simulation trigger mechanism convergence line convective cold pool

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Antioxidant and anti-HepG2 cell activities of a novel bioactive peptide from cowhide collagen in vitro

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未来食品学报(英文) 2024年第3期4卷 248-257页

作者： Zhike Xie Yuhan zhai Yuqing Zhang ming He Xuguang wang Shaoxuan Yu Haifang Xiao Yuanda Song School of Agricultural Engineering and Food Science Shandong University of TechnologyZibo 255049China State Key Laboratory of Food Science and Resources Nanchang 330047China

In the present study,the antioxidant and anti-human liver cancer(HepG2)cells effects of bioactive peptides from cowhide collagen(BPCC)were evaluated.BPCC exhibited significant scavenging effect on l,1-diphenyl-2-picrylhydrazyl(DPPH)radicals((60.09±3.51)%),2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)(ABTS)radicals((77.40±3.10)%)and hydroxyl radicals((56.00±2.30)%)as well as strong reducing power(0.320士0.025).Meanwhile,BPCC effectively protected biomacromolecules including proteins,lipids and DNA from oxidative damage induced by Cu^(2+)H_(2)O_(2)and 2,2'-azobis(2-methylpropionamidine)dihydrochloride(AAPH).Moreover,BPCC significantly inhibited cell viability of HepG2 cells in a dose-dependent manner with an estimated IC_(50)of 7.61 mg/mL.The results of 4',6-diamidino-2-phenylindole(DAPI)and acridine:orange/ethidium bromide(AO/EB)staining demonstrated the apoptotic morphological changes and cell mediated death in BPCC treated HepG2 cells.In addition,BPCC induced decrease of mitochondrial membrane potential(MMP)in HepG2 cells.Therefore,the present finding proved that BPCC encompasses significant antioxidant activity and anticancer property on HepG2 cells and can be used as alternative food antioxidants for cancer prevention benefits.

关键词： Cowhide collagen peptide Antioxidant activity Oxidative damage Anticancer activity

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Retinal vascular morphological characteristics in diabetic retinopathy: an artificial intelligence study using a transfer learning system to analyze ultra-wide field images

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International Journal of Ophthalmology(English edition) 2024年第6期17卷 1001-1006页

作者： Xin-Yi Deng Hui Liu Zheng-Xi Zhang Han-Xiao Li Jun wang Yi-Qi Chen Jian-Bo Mao ming-zhai Sun Li-Jun Shen Center for Rehabilitation Medicine Department of OphthalmologyZhejiang Provincial People’s Hospital(Affiliated People’s HospitalHangzhou Medical College)Hangzhou 310014Zhejiang ProvinceChina Department of Precision Machinery and Instrumentation University of Science and Technology of ChinaHefei 230026Anhui ProvinceChina Department of Retina Eye Hospital of Wenzhou Medical UniversityWenzhou 325027Zhejiang ProvinceChina

AIM:To investigate the morphological characteristics of retinal vessels in patients with different severity of diabetic retinopathy(DR)and in patients with or without diabetic macular edema(DME).METHODS:The 239 eyes of DR patients and 100 eyes of healthy individuals were recruited for the study.The severity of DR patients was graded as mild,moderate and severe non-proliferative diabetic retinopathy(NPDR)according to the international clinical diabetic retinopathy(ICDR)disease severity scale classification,and retinal vascular morphology was quantitatively analyzed in ultra-wide field images using RU-net and transfer learning methods.The presence of DME was determined by optical coherence tomography(OCT),and differences in vascular morphological characteristics were compared between patients with and without DME.RESULTS:Retinal vessel segmentation using RU-net and transfer learning system had an accuracy of 99%and a Dice metric of 0.76.Compared with the healthy group,the DR group had smaller vessel angles(33.68±3.01 vs 37.78±1.60),smaller fractal dimension(Df)values(1.33±0.05 vs 1.41±0.03),less vessel density(1.12±0.44 vs 2.09±0.36)and fewer vascular branches(206.1±88.8 vs 396.5±91.3),all P<0.001.As the severity of DR increased,Df values decreased,P=0.031.No significant difference between the DME and non-DME groups were observed in vascular morphological characteristics.CONCLUSION:In this study,an artificial intelligence retinal vessel segmentation system is used with 99%accuracy,thus providing with relatively satisfactory performance in the evaluation of quantitative vascular morphology.DR patients have a tendency of vascular occlusion and dropout.The presence of DME does not compromise the integral retinal vascular pattern.

关键词： diabetic retinopathy vascular morphology deep learning ultra-wide field imaging diabetic macular edema

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Dynamic simulation insights into friction weakening effect on rapid long-runout landslides:A case study of the Yigong landslide in the Tibetan Plateau,China

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China Geology 2024年第2期7卷 222-236页

作者： Zi-zheng Guo Xin-yong Zhou Da Huang Shi-jie zhai Bi-xia Tian Guang-ming Li School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China School of Geological Engineering and Geomatics Chang’an UniversityXi’an 710054China Tianjin Municipal Engineering Design&Research Institute(TMEDI) Tianjin 300392China

This study proposed a novel friction law dependent on velocity,displacement and normal stress for kinematic analysis of runout process of rapid landslides.The well-known Yigong landslide occurring in the Tibetan Plateau of China was employed as the case,and the derived dynamic friction formula was included into the numerical simulation based on Particle Flow Code.Results showed that the friction decreased quickly from 0.64(the peak)to 0.1(the stead value)during the 5s-period after the sliding initiation,which explained the behavior of rapid movement of the landslide.The monitored balls set at different sections of the mass showed similar variation characteritics regarding the velocity,namely evident increase at the initial phase of the movement,followed by a fluctuation phase and then a stopping one.The peak velocity was more than 100 m/s and most particles had low velocities at 300s after the landslide initiation.The spreading distance of the landslide was calculated at the two-dimension(profile)and three-dimension scale,respectively.Compared with the simulation result without considering friction weakening effect,our results indicated a max distance of about 10 km from the initial unstable position,which fit better with the actual situation.

关键词： Rapid long-runout landslide PFC Friction weakening Three-dimension Numerical simulation Tibetan Plateau Hydrogeology Engineering Geological hazards survey engineering

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Achieving laparoscopic anatomic resection for hepatocellular carcinoma by fluorescence guided positive staining of hepatic cone unit

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Hepatobiliary & Pancreatic Diseases International 2024年第4期23卷 406-411页

作者： Jun-Fang Deng Chuan-Hui Peng Yu Zhang Xiao-Feng Xu Rong-Liang Tong Zheng-Long zhai Di-Yu Chen Cheng Zhang Li-ming Wu Jian Wu Division of Hepatobiliary Pancreatic Surgery the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China

Laparoscopic anatomical liver resection has been increasingly reported worldwide,but how to demarcate the resection planes is technically challenging[1].Positive staining technique with intraoperative indocyanine green(ICG)-fluorescence imaging has been introduced as an effective tool for real-time intraoperative guidance[2].Liver anatomy is complex.Generally,liver is composed of 9 segments,each is composed of two to three subsegments,and each subsegment contains several hepatic cone units.A hepatic cone unit is dominated by a tertiary or quaternary hepatic pedicles[3].

关键词： hepatic resection anatomy

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Correlation between mumps and meteorological factors in Xiamen City,China:A modelling study

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Infectious Disease Modelling 2022年第2期7卷 127-137页

作者： Jie-feng Huang Ze-yu Zhao Wen-kui Lu Jia Rui Bin Deng Wei-kang Liu Tian-long Yang Zhuo-yang Li Pei-hua Li Chan Liu Li Luo Bin Zhao Yi-fang wang Qun Li ming-zhai wang Tianmu Chen State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics School of Public HealthXiamen UniversityXiamen CityFujian ProvinceChina Xiamen Center for Disease Control and Prevention Xiamen CityFujian ProvinceChina Xiang'an Hospital of Xiamen University Xiamen CityFujian ProvinceChina Public Health Emergency Center Chinese Center for Disease Control and PreventionChangping DistrictBeijing CityChina

Objective:Mumps is a seasonal infectious disease,always occurring in winter and spring.In this study,we aim to analyze its epidemiological characteristics,transmissibility,and its correlation with meteorological variables.Method:A seasonal Susceptiblee Exposede Infectious/Asymptomatice Recovered model and a next-generation matrix method were applied to estimate the time-dependent reproduction number(Rt).Results:The seasonal double peak of annual incidence was mainly in May to July and November to December.There was high transmission at the median of Rt¼1.091(ranged:0 to 4.393).Rt was seasonally distributed mainly from February to April and from September to November.Correlations were found between temperature(Pearson correlation coefficient[r]ranged:from 0.101 to 0.115),average relative humidity(r¼0.070),average local pressure(r¼-0.066),and the number of new cases.In addition,average local pressure(r¼0.188),average wind speed(r¼0.111),air temperature(r ranged:-0.128 to-0.150),average relative humidity(r¼-0.203)and sunshine duration(r¼-0.075)were all correlated with Rt.Conclusion:A relatively high level of transmissibility has been found in Xiamen City,leading to a continuous epidemic of mumps.Meteorological factors,especially air temperature and relative humidity,may be more closely associated with mumps than other factors.

关键词： Mumps Transmissibility Meteorological factors Correlation Time-dependent reproduction number

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从经营方式演化看中国农业现代化的前沿问题

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河南社会科学 2024年第5期32卷 65-73页

作者：耿明斋耿娜河南大学经济学院河南开封450046 河南财政金融学院工商管理学院河南郑州451464

在对家庭联产承包责任制改革确立农户主体地位及土地流转和规模化过程进行梳理的基础上,研究了正在蓬勃发展的几种有代表性的农业组织形式的特点和现代农业演化趋势,针对租佃高成本、超大规模垄断性经营和政府补贴等方面的问题,提出了... 详细信息

在对家庭联产承包责任制改革确立农户主体地位及土地流转和规模化过程进行梳理的基础上,研究了正在蓬勃发展的几种有代表性的农业组织形式的特点和现代农业演化趋势,针对租佃高成本、超大规模垄断性经营和政府补贴等方面的问题,提出了相应的政策建议。

关键词：土地流转农业现代化家庭规模经营承包权长期化

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糖尿病足感染病原学及抗感染治疗研究进展

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中华医院感染学杂志 2024年第4期34卷 635-640页

作者：翟筱涵王爱红母义明战略支援部队特色医学中心(原解放军第306医院)内分泌科北京100101 解放军总医院第一医学中心内分泌科北京100853

糖尿病足溃疡(DFUs)是糖尿病的一种严重并发症,与感染、截肢和死亡密切相关.糖尿病足溃疡感染(IDFU)是糖尿病患者住院的常见原因,约占糖尿病住院患者的25%,给家庭和社会带来沉重的负担.致病微生物的鉴别难度大且存在耐药性,使得IDFU的... 详细信息

糖尿病足溃疡(DFUs)是糖尿病的一种严重并发症,与感染、截肢和死亡密切相关.糖尿病足溃疡感染(IDFU)是糖尿病患者住院的常见原因,约占糖尿病住院患者的25%,给家庭和社会带来沉重的负担.致病微生物的鉴别难度大且存在耐药性,使得IDFU的诊疗具有挑战性.因此,基于IDFU的流行病学和患者个体化的病原学分析,早期识别并及时、合理应用有效的抗菌药物是改善IDFU患者预后的关键措施.本文基于国内外已有文献,就IDFU的流行病学、病原学及抗感染治疗的相关研究进展进行综述,旨在为临床提供参考.

关键词：糖尿病糖尿病足溃疡糖尿病足溃疡感染病原学流行病学抗菌治疗

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基于数值延拓方法的自振荡凝胶周期调控

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计算力学学报 2024年第2期41卷 390-395页

作者：柴莘茗宗凯强翟持昆明理工大学化工学院昆明650500

自振荡凝胶是一类由自振荡反应驱动的高分子形变聚合物,其无需外界刺激就会自发地形成周期性的形变,广泛运用于仿生蠕动机器人的研究。自振荡凝胶的化学-力学耦合关系一直是研究的重点,本文基于Ru(bpy)3催化IPAAm(N-isopropylacrylamide... 详细信息

自振荡凝胶是一类由自振荡反应驱动的高分子形变聚合物,其无需外界刺激就会自发地形成周期性的形变,广泛运用于仿生蠕动机器人的研究。自振荡凝胶的化学-力学耦合关系一直是研究的重点,本文基于Ru(bpy)3催化IPAAm(N-isopropylacrylamide)高分子凝胶的力学特征及BZ(Belousov-Zhabotinsky)反应的三维Oregonator模型构造自振荡凝胶的化学-力学耦合动态模型,并构建数值延拓算法分析自振荡凝胶周期性随反应参数和力学参数变化情况。通过本文构建的微分-代数方程组数值延拓方法,可以有效求解自振荡凝胶的极限环,为自振荡凝胶周期调控提供设计基础。

关键词： Oregonator模型配置法微分代数方程组极限环

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大学生手机冷落行为对社会心态的影响及其作用机制

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中国临床心理学杂志 2024年第1期32卷 177-181页

作者：何安明翟培培惠秋平信阳师范大学教育科学学院信阳464000

目的:探讨大学生手机冷落行为对社会心态的影响及其作用机制。方法:采用手机冷落行为量表、社会支持量表、青少年感恩量表和中国人社会心态量表对1926名大学生进行问卷调查。结果:(1)在控制性别、家庭所在地和主观社会经济地位之后,手... 详细信息

目的:探讨大学生手机冷落行为对社会心态的影响及其作用机制。方法:采用手机冷落行为量表、社会支持量表、青少年感恩量表和中国人社会心态量表对1926名大学生进行问卷调查。结果:(1)在控制性别、家庭所在地和主观社会经济地位之后,手机冷落行为显著负向影响大学生社会心态;(2)加入社会支持作为中介变量后,手机冷落行为仍显著负向影响其社会心态,社会支持起部分中介作用;(3)感恩调节了“手机冷落行为→社会支持→社会心态”这一中介作用的后半段路径。结论:大学生手机冷落行为通过影响社会支持进而影响社会心态,高水平感恩能够增强社会支持对大学生社会心态的积极影响。

关键词：手机冷落行为社会心态社会支持感恩大学生

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