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International Journal of Disaster Risk Science 2022年第2期13卷 190-198页

作者： Seong-Jin Lee Joong-Hoo Park Seung-Min cha donghyun Kim Department of Public Policy and Management.Pusan National University Busan 46241South Korea Department of Urban Planning and Engineering Pusan National UniversityBusan 46241South Korea

The coronavirus disease 2019(COVID-19) is a global pandemic that has heavily impacted not only the health sector, but also the economic sector in *** countries have projected a negative economic impact, and the effect on micro-, small-, and medium-sized enterprises(MSMEs) is predicted to be significantly *** study estimated the regional resistance of MSME sales revenues and identified the regional economic factors that affect resistance by analyzing South Korea, a country with one of the lowest economic impact projections from COVID-19. Resistance was estimated by comparing sales revenues and changes in resistance observed during the early COVID-19 period to those recorded in the same weeks(weeks 6 to 9) of 2019. The factors that affect regional resistance were determined by conducting robust regression and spatial regression analyses. The results show that the number of confirmed COVID-19 cases, a direct risk factor, is negatively related to regional resilience, while diversity is positively related to regional resistance. To improve the regional resistance against uncertain events, this study recommends increased diversity among regional industrial structures to reduce the duration of the early shock of an unexpected adverse event.

关键词： COVID-19 Economic resistance MSMEs South Korea

Recent Progress in Covalent Organic Frameworks(COFs) for Electrocatalysis

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Chinese Journal of Structural Chemistry 2022年第11期41卷 84-99页

作者： cha Li Zining Qiu Hongming Sun Yijie Yang Cheng-Peng Li College of Chemistry Tianjin Key Laboratory of Structure and Performance for Functional MoleculesTianjin Normal UniversityTianjin 300387China

Electrocatalysis provides various technologies for energy storage and conversion,which is an important part of realizing sustainable clean energy for the ***,as emerging porous crystalline polymers,possess high specific surface areas,tunable pore structures,high crystallinity and tailorable *** features endow COFs with abundant active sites and fast electron transport channels,making them potentially efficient *** recent years,COF-based electrocatalysts have been widely developed for hydrogen evolution reaction(HER),hydrogen oxidation reaction(HOR),oxygen evolution reaction(OER),oxygen reduction reaction(ORR),nitrogen reduction reaction(NRR)and carbon dioxide reduction reaction(CO_(2)RR).In this review,design strategies of COF-based electrocatalysts are briefly summarized,including applying COF as supports,introducing active metals in COF,constructing two-dimensional conductive COF,formation of COF-based hybrid and pyrolysis of COF to obtain carbon ***,the recent research progress in COF-derived catalysts for specific electrocatalytic reactions is introduced ***,the outlook and challenges of future applications of COFs in electrocatalysis are highlighted.

关键词： covalent organic frameworks electrocatalyst catalytic performance catalytic kinetics energy conversion

响应面法优化火绒草中总黄酮与总酚酸的提取工艺研究

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草地学报 2024年第3期32卷 935-944页

作者：意如乐格根图王志军胡日查百岁塞西雅拉图内蒙古农业大学草原与资源环境学院农业农村部饲草栽培、加工与高效利用重点实验室内蒙古呼和浩特010019 克什克腾旗林业和草原局内蒙古赤峰025300 克什克腾旗绿色驿站环境保护监测站内蒙古赤峰025300

为探究野生火绒草(Leontopodium leontopodioides(Wild.)Beauv)总黄酮与总酚酸最佳提取工艺及抗氧化活性,本试验采用快速溶剂萃取法探索萃取温度、循环次数、加热时间及萃取压力对火绒草总黄酮、总酚酸提取含量的影响,通过单因素试验和... 详细信息

为探究野生火绒草(Leontopodium leontopodioides(Wild.)Beauv)总黄酮与总酚酸最佳提取工艺及抗氧化活性,本试验采用快速溶剂萃取法探索萃取温度、循环次数、加热时间及萃取压力对火绒草总黄酮、总酚酸提取含量的影响,通过单因素试验和响应面设计法确定了活性物质的最佳提取工艺。结果表明:当使用70%乙醇提取火绒草中总黄酮时最佳提取工艺为:萃取温度93℃,循环次数3次,加热时间20 min,萃取压力102 bar,提取含量为(45.45±0.36)mg·g^(-1);总酚酸最佳提取工艺为:萃取温度90℃,循环次数3次,加热时间19 min,萃取压力97 bar,提取含量为(23.52±0.34)mg·g^(-1)。火绒草总黄酮提取液对DPPH自由基和ABTS自由基的IC_(50)为0.012 mg·mL^(-1)和0.356 mg·mL^(-1),具有一定的还原力。本研究可为火绒草活性物质的提取工艺及加工利用提供可靠的理论依据和详实的科学参考。

关键词：火绒草总黄酮总酚酸快速溶剂萃取响应面法优化抗氧化活性

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基于三维质量结构模型构建妇科肿瘤病人加速康复评价指标体系

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护理研究 2024年第6期38卷 998-1003页

作者：王霄霄随丽丽刘秀焕察海梅许雪云徐肖济宁医学院附属医院山东272000

目的:构建妇科肿瘤病人加速康复评价指标体系。方法:通过查阅文献、专家函询构建妇科肿瘤病人加速康复评价指标体系,采用优序图法和层次分析法确定各指标权重。结果:两轮专家函询问卷有效回收率均为100%,专家权威系数分别为0.936和0.950... 详细信息

目的:构建妇科肿瘤病人加速康复评价指标体系。方法:通过查阅文献、专家函询构建妇科肿瘤病人加速康复评价指标体系,采用优序图法和层次分析法确定各指标权重。结果:两轮专家函询问卷有效回收率均为100%,专家权威系数分别为0.936和0.950,第2轮专家函询肯德尔和谐系数为0.556~0.764(均P<0.001),二级指标变异系数为0.000~0.178,三级指标变异系数为0.000~0.193。最终形成的妇科肿瘤病人加速康复评价指标体系包括3项一级指标、9项二级指标、52项三级指标。结论:构建妇科肿瘤病人加速康复评价指标体系具有科学性、实用性,可规范妇科肿瘤手术加速康复外科的实施,保障病人安全,为妇科肿瘤病人围术期加速康复质量评价提供科学依据。

关键词：妇科肿瘤加速康复外科评价指标德尔菲法护理

Performance Study of a Hybrid Heat Pump Dryer based on Numerical Analysis and Experimental Set-up

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Journal of Thermal Science 2021年第1期30卷 111-122页

作者： SHAMSUDDEEN Mohamed Murshid cha dong-An KIM Seon-chang KANEMOTO Toshiaki KIM Jin-Hyuk Industrial Technology Korea University of Science&TechnologyDaejeon 34113Republic of Korea Thermal&Fluid System R&D Group Korea Institute of Industrial TechnologyCheonan 31056Republic of Korea Institute of Ocean Energy Saga UniversityHonjo 1Saga 840-8502Japan

Seafood,especially sea cucumbers and oysters are an expensive delicacy in several Asian *** sun-drying of these products takes 3 to 4 days and fetches a lower market *** industrial drying machines used for seafood drying are unable to dry sea cucumbers and oysters without texture and color degradation as they are delicate,temperature-sensitive and have longer drying *** economical drying system that does not cause texture or color degradation is the heat pump drying system and is commonly applied for agriculture and fabric *** this study,the heat pump technology is applied to develop two hybrid dryer models(bottom discharge and front discharge)to dry shellfish and sea cucumbers in large scale for storage and *** model is tested in a laboratory-scale with wet sponges as input material for its dehumidification capacity and the power consumed to attain the target *** front discharge model is found to have rapid drying capability and *** fluid dynamic tools are used to study the hot air flow behavior and flow uniformity inside the drying *** front discharge model showed smooth uniform flow over the trays with fewer losses in the flow *** front discharge model with higher drying rate,lower power consumption and uniform airflow distribution over the trays is chosen for the industrial-scale design.

关键词： heat pump hybrid dryer CFD drying rate sea cucumber oyster

CTC联合NLR预测可切除老年原发性胃癌患者术后辅助化疗疗效和预后的临床研究

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临床肿瘤学杂志 2024年第3期29卷 244-248页

作者：刘姹钱露茜郭业松朱璠江苏省肿瘤医院放疗科南京210000

目的探讨循环肿瘤细胞(CTC)联合中性粒细胞计数和淋巴细胞计数比(NLR)在可切除老年原发性胃癌患者术后辅助化疗疗效和预后中的预测效果。方法选择江苏省肿瘤医院2017年12月至2020年12月可切除老年原发性胃癌患者93例为观察组;选择同期... 详细信息

目的探讨循环肿瘤细胞(CTC)联合中性粒细胞计数和淋巴细胞计数比(NLR)在可切除老年原发性胃癌患者术后辅助化疗疗效和预后中的预测效果。方法选择江苏省肿瘤医院2017年12月至2020年12月可切除老年原发性胃癌患者93例为观察组;选择同期健康体检志愿者51例血清标本为对照组。观察组患者均连续完成6个月化疗,根据化疗疗效分为化疗不敏感组及化疗敏感组,比较两组CTC和NLR水平并分析其在辅助化疗疗效中的诊断效能;Kaplan-meier法绘制不同CTC和NLR表达患者的总生存时间(OS)和无进展生存时间(PFS)曲线,生存差异行Log-rank检验。结果观察组NLR高于对照组[2.90(2.15,4.20)vs.1.89(1.50,2.42),Z=-6.382,P<0.05];93例患者辅助化疗后不敏感组32例,化疗敏感组61例;化疗不敏感组患者NLR及CTC水平高于化疗敏感组(P<0.05)。受试者工作特征曲线(ROC)分析,NLR诊断化疗疗效的曲线下面积(AUC)为0.714(95%CI:0.612~0.815),当截断值为2.24时,灵敏度高达100%,特异度为41.0%;当NLR联合CTC时,AUC=0.806(95%CI:0.709~0.903),灵敏度78.14%,特异度为75.43%。仅NLR与患者年龄有关(P<0.05)。CTC高表达患者中位OS和中位PFS为22.0个月和15.0个月,均低于CTC低表达患者的27.0个月和20.0个月,差异均有统计学意义(P<0.05)。NLR高表达患者中位OS和中位PFS为22.0个月和14.0个月,均低于NLR低表达患者的30.0个月和19.0个月,差异均有统计学意义(P<0.05)。结论NLR联合CTC可预测患者辅助化疗疗效及预后,作为判断患者治疗效果及预后的潜在指标。

关键词：老年原发性胃癌循环肿瘤细胞淋巴细胞计数中性粒细胞计数辅助化疗预后

Alleviating vibrations along a harmonically driven nonuniform Euler-Bernoulli beam by imposing nodes

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International Journal of Mechanical System Dynamics 2023年第4期3卷 345-359页

作者： Melis Baltan‐Brunet Fionna Kopp Philip D.cha Department of Engineering Harvey Mudd CollegeClaremontCaliforniaUSA

A passive approach is developed to quench excess vibration along a harmonically driven,arbitrarily supported,nonuniform Euler-Bernoulli beam with constant thickness(height)and varying *** suppression is achieved by attaching properly tuned vibration absorbers to enforce nodes,or points of zero vibration,along the *** efficient hybrid method is proposed whereby the finite element method is used to model the nonuniform beams,and a formulation based on the assumed modes method is used to determine the required attachment force supplied by each absorber to induce the desired *** the attachment forces needed to induce nodes,design plots are generated for the absorber parameters as a function of the tolerable vibration amplitude for each absorber *** the node locations are judiciously chosen,it is possible to dramatically suppress the vibration along a selected region of the *** such,sensitive instruments can be placed in this region and will remain nearly *** studies illustrate the application to several systems with various types of nonuniformity,boundary conditions,and attachment and node locations;these examples validate the proposed method to passively control excess vibration by inducing nodes on nonuniform beams subjected to harmonic excitations.

关键词： vibration suppression nonuniform beam vibration absorber finite element enforcing nodes

昆明市一起聚集性发热疫情中腺病毒3型Penton base、Hexon和Fiber基因遗传进化分析

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中华微生物学和免疫学杂志 2024年第3期44卷 241-248页

作者：刘艳艳古文鹏段忠文王钰龚娇茶琦雁吴林蔚侯敏昆明市疾病预防控制中心微生物检验科昆明650228 云南省疾病预防控制中心急性传染病防制所昆明650022 昆明市呈贡区疾病预防控制中心检验科昆明650500 玉溪市疾病预防控制中心卫生监测检验科玉溪678400

目的对昆明市一起聚集性发热疫情样本进行腺病毒检测和遗传进化分析。方法采集典型发热患者咽拭子标本,使用微流体芯片技术进行30种常见呼吸道传染病病原体核酸检测。对腺病毒核酸阳性标本使用Nanopore三代高通量测序技术进行Penton bas... 详细信息

目的对昆明市一起聚集性发热疫情样本进行腺病毒检测和遗传进化分析。方法采集典型发热患者咽拭子标本,使用微流体芯片技术进行30种常见呼吸道传染病病原体核酸检测。对腺病毒核酸阳性标本使用Nanopore三代高通量测序技术进行Penton base、Hexon和Fiber三个重要基因全长序列扩增、测定和分型鉴定,构建系统进化树,开展分子变异、遗传进化等分析。结果共采集5份标本,均检出呼吸道腺病毒及流感嗜血杆菌。对腺病毒进行Nanopore三代基因测序最终均获得Penton base、Hexon和Fiber基因全长编码区核苷酸序列,5份标本之间3个基因核苷酸相似性依次为100.0%、99.9%~100.0%和100.0%,氨基酸同源性均为100.0%;与HAdV3原型株(AY599834)核苷酸相似性最高,分别为98.6%、98.7%和98.9%。系统发育分析表明,3个基因系统进化树分析结果基本一致,人腺病毒3型(HAdV3)原型株单独一支,本研究中HAdV3序列均划分在同一进化分支上,与较早年份国外及中国台湾毒株亲缘关系较远,与近年国内外毒株亲缘关系较近,与2019年日本株(LC703523)和中国广州株(MZ540961)高度同源。与原型株比较分析昆明HAdV3氨基酸突变位点,Penton base有5处变异;Hexon有10处变异;Fiber有11处变异。结论本起疫情中的腺病毒在Penton base、Hexon和Fiber基因全长序列中型别分型结果一致,为P3H3F3型,与包括原型株在内的国内外HAdV3毒株显示出非常小的遗传变异。与原型株相比发生了多处氨基酸位点突变,并且多数氨基酸位点变异发生在蛋白质的高变区或功能区,其中Hexon蛋白中M7L为昆明序列独有氨基酸突变位点。

关键词：人腺病毒3型五邻体基座蛋白六邻体蛋白纤维蛋白遗传进化

Near Homogeneous Microphysics of the Record-Breaking 2020 Summer Monsoon Rainfall during the Northward Migration over East China

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Advances in Atmospheric Sciences 2023年第10期40卷 1783-1798页

作者： Long WEN Wei ZHANG cha YANG Gang CHEN Yajun HU Hao ZHANG Xichang Satellite Launch Center Xichang 615000China Xiamen Key Laboratory of Strait Meteorology Xiamen 361012China Key Laboratory of Transportation Meteorology of China Meteorological Administration Nanjing Joint Institute for Atmospheric SciencesNanjing 210041China Xiangan Meteorological Bureau Xiamen 361103China

Knowledge of the raindrop size distribution(DSD)is crucial for disaster prevention and *** recordbreaking rainfall in the summer of 2020 caused some of the worst flooding ever experienced in *** study uses 96 Parsivel disdrometers and eight-year Global Precipitation Measurement(GPM)satellite observations to reveal the microphysical aspects of the disastrous rainfall during its northward migration over East *** results show that the nearly twice as heavy rainfall in Jiangsu Province compared to Fujian Province can be attributed to the earlier-than-average northward jump of the summer monsoon rainband to the Yangtze-Huaihe River *** persistent heavy monsoon rainfall showed similar near-maritime DSD characteristics,with a higher concentration of small raindrops than the surrounding climatic *** the northward movement of the rainband,the DSD variables and composite spectra between the pre-summer rainfall in Fujian and mei-yu rainfall in Jiangsu exhibited inherent similarities with slight regional *** are associated with similar statistical vertical precipitation structures for both convective and stratiform rain in these regions/*** vertical profiles of radar reflectivity and DSD parameters are typical of monsoonal rainfall features,implying the competition between coalescence,breakup,and accretion of vital warm rain *** study attributes the anomalously long duration of the mei-yu season for the record-breaking rainfall and reveals inherent homogeneous rainfall microphysics during the northward movement of the summer monsoon *** conclusion is statistically robust and would be helpful for accurate precipitation estimation and model parameterization of summer monsoon rainfall over East China.

关键词： precipitation microphysics raindrop size distribution mei-yu East China

共同股东与供应链协同创新——基于专利互引的视角

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经济管理 2024年第4期46卷 49-65页

作者：汤旭东王艳盈陈思岑华南理工大学工商管理学院广东广州510641 厦门国家会计学院福建厦门361005

随着产业链全球化加速以及国内市场的竞争日趋激烈,技术竞争逐步演变为供应链集群间的整体竞争,供应链协同创新的重要性日益凸显。本文利用2012-2019年A股上市公司样本,考察了上下游企业拥有共同股东能否促进供应链协同创新。研究发现,... 详细信息

随着产业链全球化加速以及国内市场的竞争日趋激烈,技术竞争逐步演变为供应链集群间的整体竞争,供应链协同创新的重要性日益凸显。本文利用2012-2019年A股上市公司样本,考察了上下游企业拥有共同股东能否促进供应链协同创新。研究发现,共同股东显著促进了供应链协同创新,在一系列稳健性检验后结论仍成立。机制检验表明,共同股东通过缓解企业间信息不对称、促进企业间资源整合而发挥作用。进一步地,当样本对中有技术密集型企业、客户的行业集中度较高以及两家企业所处地区的市场化程度均较低时,共同股东的供应链协同创新效应更强。本文从共同股东的角度研究了其对供应链上下游企业间创新合作的影响及其机制,研究结果为企业管理者制定创新发展战略提供了新思路,为政府部门就如何更好发挥资本市场机制的作用、推进产业体系现代化提供了决策参考。

关键词：共同股东 “敲竹杠”问题供应链协同创新专利互引

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