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China CDC weekly 2024年第22期6卷 503-508页

作者： wenzhao liu Xinying Zeng Qi Su Lin Xiao Shiwei liu Tobacco Control Office Chinese Center for Disease Control and PreventionBeijingChina

What is already known about this topic?In 2013,31.61%of students perceived quitting smoking as difficult,61.73%considered smoking less attractive,and 73.89%believed that secondhand smoke is definitely harmful to *** is added by this report?The percentage of students who perceived quitting smoking as difficult increased from 31.61%in 2013 to 38.83%in 2021,while the percentage of students who found smoking less attractive rose from 61.73%to 69.40%.Conversely,there was a decrease in the percentage of students who perceived secondhand smoke as harmful,from 73.89%to 68.46%.An increased awareness of the hazards of secondhand smoke was associated with a reduction in smoking *** are the implications for public health practice?It is imperative to enhance health education efforts that aim to raise awareness of the hazards of secondhand smoke.

关键词： smoke attractive Junior

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单端激励的压电细棒纵振特性分析建模

应用声学 2024年第4期43卷 719-726页

作者：潘瑞柴勇莫喜平刘文钊张秀侦中国科学院声学研究所北京100190 中国科学院大学北京100049 北京海洋声学装备工程技术研究中心北京100190

针对单端激励的压电纵振换能器中激励部分与被激模态之间的关系问题,使用压电细棒分布参数模型构建等效电路,通过计算其力学阻抗的零极点,研究了激励部分的长度与所激发模态之间的关系以及被激模态的谐振特性。通过有限元方法建立具体算... 详细信息

针对单端激励的压电纵振换能器中激励部分与被激模态之间的关系问题,使用压电细棒分布参数模型构建等效电路,通过计算其力学阻抗的零极点,研究了激励部分的长度与所激发模态之间的关系以及被激模态的谐振特性。通过有限元方法建立具体算例,仿真分析了不同激励长度对压电细棒谐振特性的影响规律。对比分析结果表明,理论模型与有限元仿真计算吻合较好。研究结果可为单端激励方法以及多模态纵振换能器的设计提供理论依据。

关键词：单端激励纵振换能器等效电路多模态有限元方法

黄土塬区果园-农田交界带土壤水分分布及农田对果园的供水特征

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水土保持学报 2024年第2期38卷 197-204,215页

作者：韩晓阳王亚萍朱元骏刘文兆西北农林科技大学水土保持科学与工程学院(水土保持研究所) 陕西杨凌712100 安康学院旅游与资源环境学院陕西安康725000

[目的]为探明黄土高原南部塬区果园-农田镶嵌格局下土壤水分空间分布与协同利用特征。[方法]选取长武塬区10龄、21龄和25龄苹果园(AO10、AO21和AO25)及其邻近农田,通过测定2021年雨季后果园-农田交界带有关位点的土壤含水量,定量计算农... 详细信息

[目的]为探明黄土高原南部塬区果园-农田镶嵌格局下土壤水分空间分布与协同利用特征。[方法]选取长武塬区10龄、21龄和25龄苹果园(AO10、AO21和AO25)及其邻近农田,通过测定2021年雨季后果园-农田交界带有关位点的土壤含水量,定量计算农田土壤储水对果园耗水的贡献。[结果]2021年降水量756 mm,为典型的丰水年份,农田和AO21、AO25果园降雨入渗深度在11月底分别达8.4,7.0,5.0 m。AO10果园-农田交界带以4 m深度为界,其下部土壤含水量较上部大,4-10 m土层平均含水量为25.5%;AO21果园0-7 m土层平均含水量为22.1%,7-10 m为15.0%;AO25果园0-5 m土层平均含水量为20.9%,5-10 m土层平均含水量为13.6%,AO21和AO25果园分别在7.0,5.0 m以下仍存在土壤干层。水平方向上,AO21、AO25果园利用邻近农田土壤水分的距离分别达到5,8 m,农果交界面上农田向果园的供水量,当以干层上界划分土壤剖面,其上为表观供水量,2个果园分别为0.08,0.25 m^(3)/m^(2);其下为实际供水量,分别为0.45,0.81 m^(3)/m^(2)。[结论]黄土塬区果园和农田镶嵌布局是一种较为合理的利用结构,在其规划管理中应考虑果树年限及其相邻农田宽度等因素,研究结果有助于推进区域土壤水资源的可持续利用及其空间优化。

关键词：土壤含水量果园-农田交界带植被格局土壤干层黄土高原

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中国近十年大气科学领域文献计量分析

气象科技进展 2024年第1期14卷 63-65,74页

作者：刘文钊李婧华中国气象局气象干部培训学院

基于Web of Science平台下的SCIE数据库和中国知网(CNKI)数据库,利用计量学方法,从论文数量、来源出版物、高被引论文和研究热点等方面,分析了中国大气科学领域的研究态势及前沿热点,客观、科学地给出近十年研究进展。在过去十年中,气... 详细信息

基于Web of Science平台下的SCIE数据库和中国知网(CNKI)数据库,利用计量学方法,从论文数量、来源出版物、高被引论文和研究热点等方面,分析了中国大气科学领域的研究态势及前沿热点,客观、科学地给出近十年研究进展。在过去十年中,气象事业呈快速上升,同时也产出了许多重要的研究成果。通过系统梳理国内外大气科学领域论文产出、高产机构、学科方向与合作态势,能够及时为气象部门科研工作者提供科研合作线索。

关键词：大气科学文献计量分析科研合作高被引论文气象事业计量学方法学科方向快速上升

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Multiple nano-drug delivery systems for intervertebral disc degeneration: Current status and future perspectives

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Bioactive Materials 2023年第5期23卷 274-299页

作者： wenzhao liu Zhanjun Ma Yonggang Wang Jingjing Yang The Second Clinical Medical College Lanzhou UniversityLanzhou730030GansuChina Louvain Drug Research Institute Advanced Drug Delivery and BiomaterialsUniversit´e Catholique de LouvainUCLouvain1200BrusselsBelgium Department of Orthopedics Lanzhou University Second HospitalLanzhou730030GansuChina

Low back pain(LBP)is a common disease that imposes a huge social and economic burden on *** disc(IVD)degeneration(IVDD)is often considered to be the leading cause of LBP and further aggravate and cause serious spinal *** established treatment strategy for IVDD consists of physiotherapy,pain medication by drug therapy,and,if necessary,surgery,but none of them can be treated from the etiology;that is,it cannot fundamentally reverse IVD and reconstruct the mechanical function of the *** the development of nanotechnology and regenerative medicine,nano-drug delivery systems(NDDSs)have improved treatment results because of their good biodegradability,biocompatibility,precise targeted specific drug delivery,prolonged drug release time,and enhanced drug efficacy,and various new NDDSs for drugs,proteins,cells,and genes have brought light and hope for the treatment of *** review summarizes the research progress of NDDSs in the treatment of IVDD and provides prospects for using NDDSs to address the challenges of *** hope that the ideas generated in this review will provide insight into the precise treatment of IVDD.

关键词： Intervertebral disc degeneration Nanotechnology Drug delivery system Nanocarriers Nanoparticles

Self-Powered Flexible Multicolor Electrochromic Devices for Information Displays

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Research 2024年第2期2023卷 529-540页

作者： wenzhao Xue Yun Zhang Feng liu Yao Dou Mei Yan Wenshou Wang School of Chemistry and Chemical Engineering University of JinanJinan 250022P.R.China

The development of self-powered flexible multicolor electrochromic(EC)systems that could switch different color without an external power supply has remained extremely ***,a new trilayer film structure for achieving self-powered flexible multicolor EC displays based on self-charging/discharging mechanism is proposed,which is simply assembled by sandwiching an ionic gel film between 2 cathodic nickel hexacyanoferrate(NiHCF)and Prussian blue(PB)nanoparticle films on indium tin oxide *** display exhibits independent self-powered color switching of NiHCF and PB films with fast responsive time and high reversibility by selectively connecting the Al wire as anodes with the 2 EC *** switching is thus achieved through a color overlay effect by superimposing the 2 EC films,including green,blue,yellow,and *** bleaching/coloration process of the displays is driven by the discharging/self-charging mechanism for NiHCF and PB films,respectively,ensuring the self-powered color switching of the displays reversibly without an external power *** is further demonstrated that patterns can be easily created in the self-powered EC displays by the spray-coating method,allowing multicolor changing to convey specific ***,a self-powered ionic writing board is demonstrated based on the self-powered EC displays that can be repeatedly written freehand without the need of an external power *** believe that the design concept may provide new insights into the development of self-powered flexible multicolor EC displays with self-recovered energy for widespread applications.

关键词： connecting repeatedly powered

High nitrogen application rate and planting density reduce wheat grain yield by reducing filling rate of inferior grain in middle spikelets

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The Crop Journal 2021年第2期9卷 412-426页

作者： Yang liu Yuncheng Liao wenzhao liu College of Agronomy Northwest A&F UniversityYangling 712100ShaanxiChina State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100ShaanxiChina

Excessive use of nitrogen fertilizer and high planting density reduce grain weight in ***,the effects of high nitrogen and planting density on the filling of grain located in different positions of the wheat spikelet are unknown.A two-year field experiment was conducted to investigate this question and the underlying mechanisms with respect to hormone and carbohydrate *** high nitrogen application and planting density significantly increased spike density,while reducing kernel number per spike and 1000-kernel ***,the effects of high nitrogen and high plant density on kernel number per spike and 1000-kernel weight were *** inhibitory effect of high nitrogen application and high planting density on kernel number per spike was achieved mainly by a reduction in kernel number per spikelet in the top and bottom ***,the decrease in 1000-kernel weight was contributed mainly by the reduced weight of grain in the middle *** grain-filling rate of inferior grain in the middle spikelets was significantly decreased under high nitrogen input and high planting density conditions,particularly during the early and middle grain-filling periods,leading to the suppression of grain filling and consequent decrease in grain *** effect resulted mainly from inhibited sucrose transport to and starch accumulation in inferior grain in the middle spikelets via reduction of the abscisic acid/ethylene *** mechanism may explain how high nitrogen application and high planting density inhibit the grain filling of inferior wheat grain.

关键词： Nitrogen Plant density Wheat Grain filling Sucrose transport

Duplicated chalcone synthase(CHS)genes modulate flavonoid production in tea plants in response to light stress

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Journal of Integrative Agriculture 2024年第6期23卷 1940-1955页

作者： Mingzhuo Li wenzhao Wang Yeru Wang Lili Guo Yajun liu Xiaolan Jiang Liping Gao Tao Xia State Key Laboratory of Tea Plant Biochemistry and Utilization Anhui Agricultural UniversityHefei 230036China School of Life Sciences Anhui Agricultural UniversityHefei 230036China College of Horticulture Northwest A&F UniversityYangling 712100China Department of Plant and Microbial Biology North Carolina State UniversityRaleigh 27606NCUSA

In tea plants,the abundant flavonoid compounds are responsible for the health benefits for the human body and define the astringent flavor *** the downstream mechanisms of flavonoid biosynthesis have been extensively studied,the role of chalcone synthase(CHS)in this secondary metabolic process in tea plants remains less *** this study,we compared the evolutionary profile of the flavonoid metabolism pathway and discovered that gene duplication of CHS occurred in tea *** identified three CsCHS genes,along with a CsCHS-like gene,as potential candidates for further functional *** the CsCHS-like gene,the CsCHS genes effectively restored flavonoid production in Arabidopsis ***,CsCHS transgenic tobacco plants exhibited higher flavonoid compound accumulation compared to their wild-type *** notably,our examination of promoter and gene expression levels for the selected CHS genes revealed distinct responses to UV-B stress in tea *** findings suggest that environmental factors such as UV-B exposure could have been the key drivers behind the gene duplication events in CHS.

关键词： tea flavonoids biosynthesis CHS gene duplication UV-B stress

滤棒载香型卷烟中柠檬烯的烟气转移行为及贮存稳定性研究

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河南农业科学 2024年第1期53卷 162-171页

作者：许克静杨泽恩杨金初陈小龙梁淼冯颖杰高明奇刘文召马胜涛张峻松河南中烟工业有限责任公司技术中心河南郑州450018 郑州轻工业大学食品与生物工程学院河南郑州450002

为明确滤棒载香型卷烟在不同贮存时间下柠檬烯的烟气转移行为、贮存稳定性和感官品质,以滤嘴中负载橘皮颗粒的滤棒载香型卷烟为研究对象,采用气相色谱-质谱(GC-MS)分析方法,测定主流烟气常规成分释放量,分析贮存和抽吸过程中柠檬烯的含... 详细信息

为明确滤棒载香型卷烟在不同贮存时间下柠檬烯的烟气转移行为、贮存稳定性和感官品质,以滤嘴中负载橘皮颗粒的滤棒载香型卷烟为研究对象,采用气相色谱-质谱(GC-MS)分析方法,测定主流烟气常规成分释放量,分析贮存和抽吸过程中柠檬烯的含量变化并评价感官质量。结果表明,橘皮颗粒能够降低卷烟烟气中焦油、烟碱及总粒相物的释放量。贮存期内柠檬烯的滤棒持留率、主流烟气粒相物转移率以及烟蒂截留率分别介于65.10%~100.00%、8.60%~14.48%和76.29%~85.17%,且随贮存时间延长均呈降低趋势,而气相转移率变化趋势不明显;贮存期在20~180 d内柠檬烯在烟支及烟气中衰减率的差异性不显著;不同贮存期卷烟中柠檬烯的逐口转移率介于0.22%~3.97%,在贮存期10~180 d内柠檬烯的逐口转移率趋于稳定,逐口转移率随抽吸口数的增加而升高,随贮存时间延长而减小并趋于平缓,且在贮存期内逐口释放率与抽吸口数存在良好的线性关系。负载橘皮滤棒的卷烟果香突出,贮存期内特征香韵强度减弱缓慢,感官品质较为稳定。

关键词：卷烟橘皮颗粒柠檬烯贮存时间转移行为稳定性

中国早期文论的海外英译与阐释——以《诗大序》为中心

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首都师范大学学报（社会科学版） 2023年第3期 95-103页

作者：刘文昭暨南大学文学院

作为“诗之大纲”的《诗大序》,不仅在传统中国关于诗的性质与功能阐释中具有权威性地位,其域外翻译与流传也甚广,在世界性诗学理论的表述中有着自身的特色与影响。二战后,随着海外汉学研究中心向美国的转移,有关《诗大序》的翻译与研... 详细信息

作为“诗之大纲”的《诗大序》,不仅在传统中国关于诗的性质与功能阐释中具有权威性地位,其域外翻译与流传也甚广,在世界性诗学理论的表述中有着自身的特色与影响。二战后,随着海外汉学研究中心向美国的转移,有关《诗大序》的翻译与研究也聚集到美国的学术圈;与此同时,基于《诗大序》英译的成果,以华人学者为代表的美国汉学研究也尝试激活《诗大序》的理论话语,使其跳脱《诗经》解读手册的单一功能,释放其与西方诗学对话的空间,彰显了中国传统诗学的生命力。

关键词：《诗大序》《诗经》华人学者汉学